JP2008045759A - Combustion device and hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device capable of preventing cracking and damage of a partitioning member even when thermal stress acts on the partitioning member, and the partitioning member is expanded and deformed, and to provide a hot water supply device comprising the combustion device. <P>SOLUTION: In a burner unit 30, air flow channel members 35, 35 are disposed at both sides of an intermediate member 36 formed by integrating a premixing member 32 and a burner port member 33. The air flow channel member 35 is provided with engagement pieces 85, 86 on upper end portions of two sheets of first and second partitioning wall components 80, 81 made of steel plate, the engagement pieces 85, 86 are bent and engaged with each other at the upper end portions, and an engaged portion is caulked and fixed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a combustion apparatus and a hot water supply apparatus, and more particularly to an apparatus capable of performing combustion by a so-called two-stage combustion method.

  Combustion devices are main components of water heaters and bath devices, and are widely used not only in factories but also in general households.

  In recent years, environmental destruction caused by acid rain has become a serious social problem, and there is an urgent need to reduce the total amount of NOx (nitrogen oxide) emissions. Therefore, in order to solve such a problem, a combustion apparatus that employs a combustion method called a so-called concentration combustion method as disclosed in Patent Documents 1 and 2 below has been provided.

  Further, as a combustion apparatus that generates a small amount of NOx accompanying the combustion operation, for example, a combustion apparatus called a so-called two-stage combustion method, such as a combustion apparatus disclosed in Patent Documents 2 and 3 below, is employed. Are known. In the two-stage combustion method, fuel gas is injected in an oxygen-deficient state, and the gas is ignited to generate a primary flame for combustion. This is a combustion type in which secondary air is supplied to generate a secondary flame.

Japanese Patent Laid-Open No. 5-118516 JP-A-6-126788 JP-A-52-143524

  Combustion devices employing the light and dark combustion method as in Patent Documents 1 and 2 have a low NOx generation amount and are well received in the market. However, this type of combustion apparatus has a disadvantage that the turn-down ratio (Turn Down Ratio TD) is small. In particular, a combustion apparatus that employs the light and dark combustion method has a drawback that it is difficult to burn in a region where the calorific value is small.

  More specifically, when the lean combustion method is adopted, as described above, the main flame is burned with a lean low-concentration mixed gas obtained by premixing about 1.6 times the theoretical air amount into the fuel gas. In addition, the combustion operation is performed by burning a high-concentration mixed gas having a high concentration of fuel gas in the vicinity thereof to generate a supplementary flame.

  By the way, although the combustion apparatus which employs the light and dark combustion method includes a blower to send in air necessary for the combustion of the mixed gas, the amount of blown air may decrease due to aging of the blower, clogging of the filter, or the like. . When the amount of blown air decreases in this way, the amount of air in the mixed gas supplied for main flame formation decreases, and the combustion speed of the mixed gas tends to increase. For this reason, if the combustion operation is performed in a region where the heat generation amount is small in a situation where the blown air amount is reduced, the base end portion of the flame may approach the flame hole and damage the flame hole. Therefore, in the combustion apparatus adopting the light and dark combustion method, there is a problem that the combustion in a region where the calorific value is small must be limited in anticipation of the secular change, and the turndown ratio is accordingly reduced.

  On the other hand, a combustion apparatus that employs a two-stage combustion method has a feature that a turn-down ratio can be made higher than that of a combustion apparatus that employs a concentration combustion method. However, when the two-stage combustion method is employed as the combustion mode, the combustion state tends to become unstable because the fuel gas needs to be burned in a state where oxygen is insufficient when the primary flame is formed. For this reason, there are no practical hot water heaters that are currently on the market that employ the two-stage combustion method. Therefore, the present inventors made a prototype of a combustion apparatus 200 as shown in FIG. 24 and repeated the experiment for the purpose of providing a combustion apparatus employing a two-stage combustion method.

  The main part of the combustion apparatus 200 includes a premixing member 201, a flame hole member 202, and a partition wall member 203 shown in FIG. Although a single combustion apparatus 200 can be used, a plurality of combustion apparatuses 200 are often used side by side as shown in FIG. When the combustion apparatus 200 is used side by side as shown in FIG. 24A, the partition member 203 is shared by the adjacent combustion apparatuses 200 and 200, and the premixing member 201 and the flame hole member are interposed between the partition members 203 and 203. An intermediate member 205 formed by combining 202 is disposed.

  The partition member 203 has a main part formed by bending a single steel plate or the like, and has an air flow path through which air introduced from the outside flows. The partition member 203 is arranged so as to extend toward the downstream side in the flow direction of the premixed gas (upward in FIG. 24) with respect to the intermediate member 205 with the bent portion as the leading end side. The partition member 203 includes an air supply port 203a on the tip side.

  The combustion apparatus 200 includes a combustion unit 206 in a region surrounded by the intermediate member 205 and partition members 203 and 203 disposed on both sides thereof. The region on the flame hole member 202 side of the combustion unit 206 is a region functioning as a first combustion region 207 for forming a primary flame, and the region on the tip side of the partition wall member 203 is a second combustion region 208. It is an area that functions as In the second combustion region 208, unburned fuel gas contained in the gas flowing from the first combustion region 207 using the air supplied from the air opening 203 a provided at the tip of the partition wall member 203. Is burned to form a secondary flame.

  Here, when the present inventors repeated the experiment by arranging a plurality of the above-described combustion devices 200 as shown in FIG. 24A, the combustion used for the combustion operation accompanying the fluctuation of the combustion amount required for the combustion device 200 When the operation of changing the number of the devices 200 is repeated, the combustion unit 206 (206a) of the combustion device 200 that performs the combustion operation (hereinafter referred to as the combustion device 200a as necessary) and the combustion device 200 that does not perform the combustion operation. Thermal stress acts on the partition member 203 located at a position separating the combustion unit 206 (206b) of the combustion device 200b (hereinafter referred to as the combustion apparatus 200b as necessary), and in some cases, the partition member 203 is deformed or cracked. I found out that this could happen.

  That is, when the combustion devices 200 are arranged side by side and the combustion operation is performed in some of the combustion devices 200, the partition wall member 203 at the boundary between the combustion devices 200a and 200b is heated at a high temperature by heating the surface on the burner unit 204a side. On the other hand, the surface on the burner unit 204b side is in an unheated state. Therefore, the partition member 203 at the boundary between the combustion devices 200a and 200b has a large temperature difference between the front surface side and the back surface side when the combustion portion 206a side is in a combustion operation state and the combustion portion 206b side is in a combustion stop state. There was a possibility of deformation or cracking.

  Based on such knowledge, the present invention includes a combustion device in which thermal stress acts on the partition wall member, and the partition wall member is not easily cracked or damaged even if expansion or deformation of the partition wall member occurs, and the combustion device. The purpose is to provide a hot water heater.

  Accordingly, the invention according to claim 1, which is provided to solve the above-described problem, is a premixing member capable of premixing fuel gas and air to form a premixed gas, and the premixing member. A flame hole member arranged on the downstream side in the flow direction of the premixed gas, and a partition wall arranged on the side of the flame hole member and extending toward the downstream side in the flow direction of the premixed gas supplied from the flame hole member And a combustion part surrounded by the partition member and the flame hole member and capable of combusting a premixed gas supplied from the flame hole member, and the combustion part is supplied from the flame hole member. It has a first combustion region on the upstream side in the gas flow direction, and has a second combustion region on the downstream side in the flow direction of the premixed gas with respect to the first combustion region and on the tip side of the partition member. The premixed gas supplied to the combustion section is theoretically empty in the first combustion region. Combusting under an air amount smaller than the amount, and supplying the second combustion region with air in excess of the amount of air that is insufficient to completely burn the premixed gas in the combustion in the first combustion region. The partition member has a first partition wall structure and a second partition wall structure, and the first and second partition wall structures engage with each other at the end portions to form an engagement portion. The combustion apparatus is characterized by being formed and integrated.

  In the combustion apparatus of the present invention, the partition member that defines the combustion part is constituted by the first and second partition structural bodies, and both are engaged with each other at the end part to form the engagement part. It is set as the structure which integrated the 2 partition structure. Therefore, in the combustion apparatus of the present invention, even if only one of the first and second partition members is expanded due to a temperature rise, the stress acting on the first and second partition members is buffered at the engaging portion. Unreasonable stress does not act on the partition structure or the second partition structure. Therefore, in the combustion apparatus of the present invention, even when the combustion operation is performed in such a state that a temperature difference between the first partition wall structure and the second partition wall structure occurs, the partition wall member is deformed, Problems such as cracks in the partition members are unlikely to occur.

  Further, in the combustion apparatus of the present invention, the first and second partition members are engaged with each other at the tip side portion of the partition member. Therefore, in the combustion apparatus of the present invention, even if both of the first and second partition walls are heated during the combustion operation, the extent of expansion and expansion of both is almost the same. It is unlikely that either one will be deformed extremely greatly, or that a large thermal stress will act on one. Therefore, in the combustion apparatus of the present invention, even when both of the first and second partition wall structural bodies are heated during the combustion operation, problems such as deformation of the partition wall member and cracks in the partition wall member occur. Hateful.

  Here, in the combustion apparatus according to claim 1, the present inventors arrange the first partition member constituting body and the second partition member constituting the partition member at a predetermined interval, and between them. In addition, an attempt was made to form a flow path portion through which air to be supplied to the first combustion region and the second combustion region can flow. In such a configuration, when the air supplied to the first combustion region and the second combustion region is supplied to the passage portion during the combustion operation, an air layer is formed between the first and second partition members, thereby There is a possibility that heat transfer between the first and second partition members is suppressed. Therefore, when the flow path part is provided in the partition member, it is assumed that only one side of the first and second partition members is expanded due to the temperature rise and the other side is more likely to maintain a low temperature state.

  However, as described above, in the combustion apparatus according to claim 1, since the first and second partition member structures are engaged and integrated with each other at the tip side portion of the partition member, the first and second partition members are integrated. Even if one side greatly expands or deforms with respect to the other due to a temperature difference between the partition walls, it can be buffered.

  Accordingly, in the invention according to claim 2 provided based on such knowledge, the partition member is arranged such that the first partition member structure and the second partition member structure are arranged at a predetermined interval, and the flow is between them. A passage portion is provided, the flow passage portion is present on the side of the combustion portion, and air supplied to the flow passage portion is supplied to the first combustion region and / or the second combustion region. The combustion apparatus according to claim 1, wherein the combustion apparatus can be supplied.

  Even in such a configuration, it is possible to provide a combustion apparatus in which problems such as deformation of the partition wall member and cracks in the partition wall member are unlikely to occur.

  Here, in the combustion apparatus according to the first or second aspect, the engaging portion is formed by folding the other end portion into one end portion of either the first partition wall structure body or the second partition wall structure body. The structure which made the 1 partition structure and the 2nd partition structure engage is sufficient (Claim 3).

  Further, in the combustion apparatus according to claim 1 or 2, a bent piece is provided at one or both ends of the first partition wall constituting body and the second partition wall constituting body, The first partition structure and the second partition wall are folded by folding the first partition structure body and the second partition structure body with a bent piece provided on one side of the first partition structure body and the second partition wall structure body. It may be formed by engaging a structure (claim 4).

  According to such a configuration, the end portions of the first and second partition members can be firmly engaged with each other, and even if thermal stress acts on only one of the first and second partition members, deformation or the like occurs. A combustion apparatus capable of mitigating this can be provided.

  According to the fifth aspect of the present invention, bent pieces are provided at the end portions of the first partition wall constituting body and the second partition wall constituting body, and the engaging portions are bent pieces provided at the first partition wall constituting body. The first engaging portion formed by folding the end portion of the second partition wall structure and the bent portion provided on the second partition wall structure to fold the end portion of the first partition wall structure body. The combustion apparatus according to claim 1 or 2, wherein the two engaging portions are provided so as to be alternately arranged.

  In the combustion apparatus of the present invention, the first engaging portion formed by bending the bent piece provided on the first partition wall structure and the bent piece provided on the second partition wall structure are formed. The second engaging portions are arranged alternately. Therefore, in the combustion apparatus of this invention, the 1st, 2nd partition structural body can be firmly integrated in the whole engaging part provided in the partition member.

  The invention according to claim 6 is characterized in that the first partition wall structure and the second partition wall structure are caulked at the engaging portion. It is.

  According to such a configuration, it is possible to firmly integrate the first and second partition wall constituting bodies while relieving the stress acting due to the expansion and deformation of the first and second partition wall constituting bodies.

  Here, the combustion apparatus according to each of the above claims arranges a plurality of intermediate members configured by combining the mixing member and the flame hole member, and is provided downstream of each intermediate member in the premixed gas flow direction. It is possible to adopt a configuration in which a partition member is disposed between the combustion portions. In the case of such a configuration, for example, when an engaging portion formed by engaging the first and second partition wall structures protrudes toward the downstream side in the flow direction of the premixed gas, the adjacent combustion is caused by the engaging portion. There is a possibility that the transfer of fire between parts will be hindered.

  Accordingly, in the invention according to claim 7 provided based on such knowledge, a plurality of intermediate members configured by combining the premixing member and the flame hole member are arranged, and one intermediate member is preliminarily arranged. A partition member is interposed between one combustion section provided on the downstream side in the mixed gas flow direction and another combustion section provided on the downstream side in the premixed gas flow direction with respect to the adjacent intermediate member. The partition member is provided with a notch on the front end side, and the second combustion regions of the adjacent combustion parts are communicated with each other via the partition member via the notch. The combustion apparatus according to any one of claims 1 to 6.

  In the combustion apparatus of the present invention, the notch portion is provided in the partition member interposed between the adjacent combustion portions, and the second combustion regions communicate with each other through this. Therefore, in the combustion apparatus of the present invention, the fire transfer proceeds smoothly between adjacent combustion portions.

  In the combustion apparatus according to the seventh aspect, it is desirable that the notch is provided at the center in the longitudinal direction of the partition wall member or in the vicinity thereof (claim 8).

  According to such a configuration, it is possible to provide a combustion device in which the fire transfer between adjacent combustion portions is smoother.

  Here, in the case where the notch portion is provided as in the combustion apparatus described in the seventh and eighth aspects of the present invention, if combustion air is supplied in the vicinity of the notch portion, this causes a fire transfer between adjacent combustion portions. There is a possibility of being disturbed.

  Therefore, in the invention according to claim 9 provided based on such knowledge, an opening for supplying air to the second combustion region is provided on the distal end side of the partition member, and the opening is The combustion apparatus according to claim 7 or 8, wherein the combustion apparatus is provided at a position away from the notch.

  In the combustion apparatus of the present invention, an opening for supplying air to the second combustion region is provided at a position off the notch. Therefore, even when a plurality of combustion apparatuses of the present invention are arranged side by side, the fire transfer between the combustion parts of adjacent combustion apparatuses occurs smoothly.

  In the invention according to claim 10, a plurality of openings for supplying air to the second combustion region are arranged in a row on the leading end side of the partition member, and the intervals between adjacent openings are different. The combustion apparatus according to any one of claims 1 to 9, wherein a wider opening interval expanding portion exists.

  In the combustion apparatus of the present invention, there is an opening interval widening portion in which the interval between the air supply openings provided in the partition member is wider than the others, and therefore the air flow in the portion is small. For this reason, even when a plurality of the combustion apparatuses of the present invention are arranged side by side, the fire transfer smoothly proceeds between the combustion sections of the adjacent combustion apparatuses in the opening interval enlarged portion or in the vicinity thereof.

  Further, in the invention according to claim 11 provided based on the same knowledge, a plurality of openings for supplying air to the second combustion region are arranged in a row on the tip side of the partition member. The opening interval enlarged portion where the interval between adjacent openings is wider than the others exists, and the opening interval enlarged portion is provided at a position corresponding to the notch portion. It is a combustion apparatus in any one.

  The combustion apparatus of the present invention has the above-described notch, and an opening interval widening portion is provided at a position corresponding to this notch. Therefore, in the combustion apparatus of the present invention, the fire transfer characteristics are synergistically improved by the notch portion and the opening interval widening portion, and the fire transfer between adjacent combustion portions proceeds very smoothly.

  Here, as described above, when the bent portion provided on one side of the first and second partition wall constituting bodies is bent toward the other side of the first and second partition wall constituting bodies, There may be a gap between the back side of the fold portion of the piece and the other end of the first and second partition members. If such a gap exists, there is a possibility that air or gas will flow into the part and deteriorate the burning characteristics of the combustion device.

  Accordingly, the invention according to claim 12 provided based on such knowledge is provided with a bent piece at one or both ends of the first partition wall structure and the second partition wall structure, And a bent piece provided at one end of the first partition wall structure and the second partition wall structure so as to cover the other edge portion at a position adjacent to the first wall structure. A projection portion is provided at the tip portion on the other side, and the projection portion closes a gap between the inside of the fold portion of the bent piece on the one side and the tip portion on the other side. Or it is reduced, It is a combustion apparatus of any one of Claims 1-11 characterized by the above-mentioned.

  In the combustion apparatus of the present invention, the gap between the fold portion of the bent piece provided on one side of the first and second partition structural members and the tip portion on the other side is closed or reduced by the protruding portion, Air and gas can be prevented from leaking through the gap. Therefore, according to the above-described configuration, it is possible to prevent the leakage of air and gas, which is an impediment to fire transfer in the notch.

  The invention according to claim 13 includes a combustion means for burning fuel gas, and a heat exchange means capable of heating the liquid using the thermal energy generated by the combustion operation in the combustion means. It is a hot water supply device provided with the combustion apparatus of any one of Claims 1-12 in a means.

  Since the hot water supply apparatus of the present invention includes the combustion device according to each of the above claims as a combustion means, problems such as deformation of the partition member constituting the combustion device and cracks in the partition member and aging deterioration may occur. Hard to happen.

  ADVANTAGE OF THE INVENTION According to this invention, even if a thermal stress acts on a partition member and expansion | swelling, a deformation | transformation, etc. of a partition member occur, the combustion apparatus which a crack does not produce in a partition member easily, and a hot water supply apparatus provided with the said combustion apparatus Can be provided.

  Next, a hot water supply device 1 and a combustion device 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the hot water supply device 1 is provided with a blower means 3, a heat exchange means 5, a combustion means 6, an exhaust means 7, and the like inside a box-shaped main body 2. The hot water supply apparatus 1 supplies the fuel introduced from the outside through a gas introduction pipe (not shown) to the combustion means 6 from the gas nozzle 8 and burns it. The heat generated thereby causes the hot water supplied to the heat exchange means 5 and The heating medium is heated.

  The hot water supply device 1 of the present embodiment is characterized by the configuration of the combustion device 10 that constitutes the combustion means 6. More specifically, as shown in FIG. 2, the combustion means 6 includes a case member 11 and a combustion device 10 disposed therein.

  The combustion apparatus 10 has a configuration in which a plurality of burner units 30 as shown in FIG. 3 are arranged side by side in the case member 11 so that a flame can be formed upward (to the heat exchange means 6 side). The burner unit 30 functions alone as a combustion device, and a main part is constituted by the premixing member 32, the flame hole member 33, and the air flow path member 35 (partition wall member).

  More specifically, the burner unit 30 (combustion device) can realize so-called two-stage combustion. As shown in FIGS. 2 to 6 and the like, the premixing member 32 and the flame hole member 33 are combined. The air flow path member 35 is disposed on both sides of the intermediate member 36 configured as described above, and the combustion portion 34 is formed in a region defined by the flame hole member 33 and the air flow path member 35 on both sides. Yes. In other words, in the burner unit 30, the intermediate member 36 and the combustion part 34 are sandwiched between the air flow path members 35. Further, since the burner unit 30 is housed inside the case member 11, the portions on both ends in the longitudinal direction of the burner unit 30 are closed by the wall surface of the case member 11. Therefore, the combustion part 34 is partitioned by the wall surface of the case member 11 at both longitudinal ends of the burner unit 30.

  Moreover, in the combustion apparatus 10 of this embodiment, as shown in FIG. 2, it is set as the structure which shared the air flow path member 35 between adjacent burner units 30. FIG. Therefore, the combustion apparatus 10 also has a configuration in which an air flow path member 35 is interposed between a plurality of intermediate members 36 and combustion portions 34 provided.

  The premixing member 32 has a stubborn appearance as shown in FIG. 7, and is provided for mixing fuel gas and air supplied via a gas introduction pipe (not shown). The premixing member 32 is pressed into a single steel plate to provide irregularities, and is bent to form a front wall 32a and a back wall 32b, and these outer peripheral portions are welded so that gas does not leak. Thus, a space (mixing flow path 37, opening row portion 38) in which fuel gas or air can flow is formed. That is, by bending the steel plate with the irregularities as described above so that the front wall 32a and the back wall 32b face each other, the front wall 32a and the back wall 32b are formed as shown in FIGS. A part that is almost in close contact with the front wall 32a and the back wall 32b can be separated with a gap, and the separated part functions as the mixing flow path 37 and the opening row part 38.

  As shown in FIG. 7, the premixing member 32 is roughly divided into a mixing channel 37 and an opening row portion 38. The mixing channel 37 is on the lower side of the premixing member 32, and one end communicates with a gas inlet 40 provided at the lower corner (lower left side in FIG. 7) of the premixing member 32, and the other end is preliminarily provided. The flow path communicates with the opening row portion 38 inside the mixing member 32. The mixing channel 37 has a constricted portion 41 whose channel cross-sectional area is temporarily constricted on the downstream side in the flow direction of the fuel gas or air with respect to the gas introduction port 40, and the cross-sectional area gradually decreases further on the downstream side. There is an enlarged diameter portion 43 that increases. Further, the mixing channel 37 has a uniform cross section 45 having a uniform cross section on the downstream side of the enlarged diameter portion 43.

  In the mixing channel 37, the channel linearly extends in a section from the gas inlet 40 to the uniform cross section 45 through the throttle portion 41 and the enlarged diameter portion 43. On the other hand, in the uniform cross section 45, the flow path is bent substantially vertically upward at the end portion, and is connected to the opening row portion 38 inside the premixing member 32.

  The opening row portion 38 is located at the upper end portion of the premixing member 32 and extends over the entire longitudinal direction as shown in FIG. The cross-sectional shape of the opening row portion 38 has a two-stage shape as shown in FIGS. 8 and 9, and is roughly divided into an upper step portion 38a and a lower step portion 38b. The upper step portion 38a is narrower than the lower step portion 38b, that is, the gap between the front wall 32a and the back wall 32b is narrower.

  The upper step part 38 a has a flat top part 46 and has vertical walls 47, 47 extending vertically downward from both sides of the top part 46. The vertical walls 47, 47 each have a lower end portion that extends toward the outside of the premixing member 32, and this end portion is connected to the lower step portion 38 b described above.

  As shown in FIG. 7, the vertical walls 47 and 47 are provided with a number of openings 48. The openings 48 are provided in a row in the longitudinal direction of the premixing member 32 with a certain interval. In the present embodiment, the opening 48 is provided only on the front side and the back side of the opening row portion 38, that is, on the front wall 32 a side and the back wall 32 b side, and is not provided on the top portion 46.

  The lower step portion 38b is a space that exists below the upper step portion 38a and extends in the longitudinal direction of the premixing member 32 in the same manner as the upper step portion 38a. As shown in FIGS. 8 and 9, the lower step portion 38b has vertical walls 49, 49 extending substantially vertically downward. As shown in FIGS. 7 and 9, the lower step portion 38 a communicates with the rising portion of the uniform cross section 45 of the mixing channel 32.

  Next, the configuration of the flame hole member 33 will be described. As shown in FIG. 5, the flame hole member 33 is a member that is mounted so as to cover the top portion 46 side of the premixing member 32 described above. As shown in FIG. 5 and FIG. 10, the flame hole member 33 has a configuration in which the main body member 50 is the center and a decompression wall 51 is welded and attached to both sides thereof.

  The main body member 50 is formed into a box shape by subjecting a single steel plate to press working to provide irregularities, and subjecting this to bending processing, spot welding, and the like. As shown in FIG. 10, the main body member 50 has a top surface 55, long side surfaces 56 and 57 perpendicular to the top surface 56, and short side surfaces 58 and 59, and a surface (part) facing the top surface 55 is open. Has been.

  As shown in FIGS. 5 and 10, the top surface 55 is long and elongated. Further, as shown in FIGS. 10 and 11, the top surface 55 has a shape in which the central ridge line portion 55 a is the highest, and is gently inclined downward toward the long side surfaces 56 and 57 with this as a boundary. It has become. The flame hole member 33 is formed by bending a steel plate as described above. As shown in FIG. 11, the steel plate is located inside the main body member 50 at the ridge line portion 55a of the top surface 55 (downward in FIG. 4 and the like). A vertical wall 55b is formed that is folded toward the inside and protrudes substantially vertically downward toward the internal space of the main body member 50.

  The top surface 55 of the main body member 50 is provided with a slit-like opening (hereinafter referred to as a flame hole 60) that functions as a flame hole of the combustion unit 34 described later in the burner unit 30. The flame hole 60 is opened to extend in the width direction of the top surface 55. A large number of flame holes 60 are provided throughout the top surface 55.

  Each flame hole 60 provided in the top surface 55 is arranged in parallel to the longitudinal direction of the top surface 55. Further, a flame hole group 61 is formed on the top surface 55 with a predetermined number (three in the present embodiment) of flame holes 60 provided in parallel as a set. Each flame hole group 61 is arranged on the top surface 55 at regular intervals.

  The long side surfaces 56 and 57 are formed by bending both end portions in the width direction (short direction) of the top surface 55 downward about 90 ° with respect to the top surface 55, and are long wall surfaces in the longitudinal direction of the main body member 50. It is.

  Focusing on the cross-sectional shape of the main body member 50, as shown in FIG. 11 and the like, the long side surfaces 56 and 57 are provided with two upper restricting portions 62 and 62 and lower restricting portions 63 and 63, respectively. ing. In other words, the long side surfaces 56 and 57 of the main body member 50 have two upper bulging portions 65 and lower bulging portions 66 except for the base end portion. The bulging portions 65 and 65 are provided in a portion continuous with the top surface 55 described above, and the bulging portions 66 and 66 are located on the proximal end side (lower end side) of the main body member 50 with respect to the bulging portions 65 and 65. ). Further, upper restricting portions 62, 62 exist between the bulging portions 65, 65 and the bulging portions 66, 66, and a lower restricting portion is provided between the bulging portions 66, 66 and the base end portion of the main body member 50. 63, 63 exist.

  The lower end side of the bulging portion 65 and the upper end side portion of the throttle portion 62, and the lower end side of the bulging portion 66 and the upper end side portion of the throttle portion 63 respectively extend toward the lower side of the main body member 50. It is gently connected through inclined surfaces 68 and 69 inclined inward. Further, the lower end side of the restricting portion 62 and the upper end side portion of the bulging portion 66, and the lower end side of the restricting portion 63 and the base end portion of the main body member 50 are respectively in the lower direction of the main body member 50. It is gently connected via inclined surfaces 70 and 71 that are inclined outward.

  As shown in FIG. 10 and the like, the upper bulging portion 65 and the lower bulging portion 66 described above are respectively provided over the entire longitudinal direction of the flame hole member 33. In addition, a plurality of openings 67 having a small opening area are provided in the upper bulging portions 65 and 65 in a row in the longitudinal direction of the flame hole member 33.

  A plurality of protrusions 64 are provided on the lower restricting portions 63 and 63. The protrusion 64 protrudes outward from the surface of the lower throttle parts 63 and 63 in a state where the main body member 50 is viewed from the surface side, and forms a groove on the inner side of the main body member 50. The protrusion 64 extends in the height direction of the flame hole member 33 (up and down direction in FIG. 10 and the like). And the groove | channel formed in the back side of the protrusion 64, ie, the inner side of the main body member 50, is formed so that the above-mentioned inclined surfaces 69 and 71 may be connected.

  As shown in FIG. 11, the long side surfaces 56 and 57 are folded back by about 90 ° twice on the base end side (open end side) of the main body member 50, and are composed of a bottom wall 72 a and an outer wall 72 b. Concave grooves 72 and 72 are formed. The bottom wall 72 a protrudes outward of the main body member 50 substantially perpendicularly to the long side surfaces 56 and 57. Further, the outer wall 72 b rises substantially vertically upward with respect to the bottom wall 72 a and is substantially parallel to the long side surfaces 56 and 57.

  The outer walls 72b and 72b are provided with protrusions 72c and 72c protruding toward the long side surfaces 56 and 57 at positions on both ends in the longitudinal direction of the main body member 50. The long side surfaces 56 and 57 are provided with protrusions 72d and 72d protruding toward the outer walls 72b and 72b. These protrusions 72c and 72d are used to lock the air flow path member 35 described later in detail.

  The decompression wall 51 is fixed to the upper end portions of the long side surfaces 56 and 57 of the main body member 50. The decompression wall 51 is a long plate-like body as shown in FIGS. As shown in FIG. 11, the decompression wall 51 has a cross-sectional shape from the upper bulging portion 65 provided on the long side surface 56 or the long side surface 57 to the middle part of the lower bulging portion 66, that is, the upper bulging portion 65. The cross-sectional shape of the inclined surface 68, the throttle portion 62, the inclined surface 70, and the downward bulging portion 66 is approximated and fixed along these portions.

  The flame hole member 33 has a gap 75 between the long side surfaces 56 and 57 of the main body member 50 and the decompression wall 51. The gap 75 is open on the upper side in the state shown in FIG. This opening portion functions as a side flame hole 76. Note that a small protrusion 77 is formed on the inner surface of the decompression wall 51 as shown in FIG. 11, and the protrusion 77 is in contact with the long side surfaces 56 and 57. Thereby, the space | interval of the side flame hole 76 is ensured more than the protrusion part of the protrusion 77. FIG.

  Here, as described above, the upper bulging portion 65 is provided with a plurality of openings 67 arranged in a line, and the inside and outside of the main body member 50 communicate with each other through the openings 67. Further, as described above, the decompression wall 51 is attached to the outside of the upper bulging portion 65 via a predetermined gap 75. Further, the upper side of the gap 75 is opened via the side flame hole 76 and the lower side is closed. Therefore, when a gas flows into the internal space of the flame hole member 33, the gas flows out to the gap 75 side through the opening 67 as shown by a two-dot chain line in FIG. It will flow toward.

  Next, the air flow path member 35 will be described. The air flow path member 35 is a member having the most characteristic configuration in the present embodiment, and is a wall-like member having a thin external shape as shown in FIGS. The air flow path member 35 is disposed on the side of the premixing member 32 and the flame hole member 33 described above, and the air necessary for the combustion of the fuel gas supplied from the flame hole member 33 and the premixed gas containing the fuel gas, It serves as a flow path for supplying to a position suitable for combustion and as a partition that separates adjacent burner units 30.

  The air flow path member 35 is configured by combining a first partition wall structure 80 as shown in FIG. 14 and a second partition wall structure 81 as shown in FIG. As shown in FIGS. 12 and 13, the air flow path member 35 is a hollow member whose front end side (upper end side in FIG. 12 and the like) is closed and whose base end side (lower end side in FIG. 12 and the like) is opened. There is an air passage 82 which will be described later in detail.

  First, the first and second partition member structures 80 and 81 constituting the air flow path member 35 will be described in detail. The planar view is constituted by a substantially rectangular steel plate. In the state shown in FIGS. 14 and 15, the first and second partition members 80 and 81 become the tip side when the upper end side (hereinafter referred to as the upper end portions 80 a and 81 a) is assembled as the air flow path member 35. The lower end side (hereinafter referred to as the lower end portions 80b and 81b) is the portion that becomes the base end portion of the air flow path member 35. The first and second partition members 80 and 81 are roughly divided into three regions from the upper end portions 80a and 81a to the lower end portions 80b and 81b, respectively.

  More specifically, the first and second partition members 80 and 81 are roughly divided into regions A to C from the upper end portions 80a and 81a side. The region A is a region extending from the upper end portions 80a, 81a of the first and second partition members 80, 81 to about に in the height direction (vertical direction in FIGS. 12 and 13), and a tip region 130 described later. It is a part which constitutes. In addition, the region B is a region that is located approximately in the center of the first and second partition members 80 and 81 and is a part that configures an intermediate region 131 described later. The region C is a region that exists on the lower end side of the first and second partition members 80 and 81, and is a part that forms a base end region 132 described later.

  The first and second partition wall structures 80 and 81 are formed in the region A and valley folds L1 and peaks extending linearly in the width direction of the first and second partition wall structure bodies 80 and 81 (left and right direction in FIGS. 14 and 15). And a folded portion L2. The valley fold portion L1 is present on the upper end portions 80a and 81a side of the mountain fold portion L2. As shown in FIGS. 12 and 13, the first and second partition members 80 and 81 are valley-folded when viewed from the outside of the air flow path member 35 along the valley fold portion L1 when the air flow path member 35 is assembled. It is bent so as to be in a state, and is bent along the mountain fold portion L2 so as to be in a mountain fold state as viewed from the outside of the air flow path member 35.

  The portions on the upper end portions 80 a and 81 a side of the first partition member structures 80 and 81 on the side of the upper end portions 80 a and 81 a are the portions constituting the engaging portion 90 in the assembled state of the air flow path member 35. Further, the portion from the valley fold portion L1 to the mountain fold portion L2 is a portion constituting the inclined surfaces 91 and 94 in the assembled state of the air flow path member 35.

  The first and second partition members 80 and 81 are configured such that a large number of engagement pieces 85 and 86 and engagement notches 87 and 88 are provided at the upper end portions 80a and 81a of the region A. The engagement pieces 85 and the engagement notches 87 are provided alternately in the width direction (longitudinal direction) of the first partition wall structure 80. Similarly, the engagement pieces 86 and the engagement notches 88 are provided alternately in the width direction (longitudinal direction) of the second partition wall structure 81. The engagement pieces 85 and 86 are hatched portions in FIG. 14A and FIG. 15A, and before the air flow path member 35 is assembled, FIG. 14B and FIG. As shown in FIG. 2, the main parts of the first and second partition members 80 and 81 are bent in a substantially vertical direction.

  The engaging pieces 85 and 86 are piece-like portions that are bent from the upper end portions 80a and 81a of the first partition structure members 80 and 81 toward the back surface side, respectively. It is used to engage with each other at the distal end portion of the air flow path member 35. Further, the engagement notches 87 and 88 are notches provided on the upper end portions 80a and 81a side of the first partition members 80 and 81, respectively, and the engagement pieces 85 and 86 are formed when the air flow path member 35 is assembled. It is a part to be engaged. More specifically, the engagement piece 85 on the first partition wall structure 80 side engages with an engagement notch 88 provided on the second partition wall structure 81 side in the assembled state of the air flow path member 35. The engagement piece 86 on the second partition wall structure 81 side is a part that engages with an engagement notch 87 provided on the first partition wall structure 80 side. The width of the engagement notches 87 and 88 (the length in the left-right direction in FIGS. 14 and 15) is substantially the same as the width of the engagement pieces 85 and 86.

  Of the engagement pieces 85 and 86 described above, engagement pieces 85 and 86 (hereinafter referred to as engagement pieces 85a and 86a as required) that are present at substantially the center in the longitudinal direction of the first and second partition members 80 and 81. 14) is partially cut away as shown in FIG. 14 (c) and FIG. 15 (c), and is partially different in shape from those provided in other parts. More specifically, the other engagement pieces 85 and 86 except for the engagement pieces 85a and 86a have portions indicated by hatching H1 in FIGS. 14 (c) and 15 (c). The portion 86a is cut out to form cutouts 83 and 84. On the other hand, the engagement pieces 85a and 86a are provided with protrusions 83a and 84a that do not exist in the other engagement pieces 85 and 86, as indicated by hatching H2 in FIGS. 14C and 15C. It has been configured.

  When the first and second partition wall structures 80 and 81 are assembled into the air flow path member 35, the notches 83 and 84 arrive at the same place, that is, at substantially the center in the longitudinal direction of the air flow path member 35, A notch 89 for fire transfer is formed. The notch portion for fire transfer 89 communicates the space on the first partition wall structure 80 side and the space on the second partition wall structure 81 side separated by the air flow path member 35. As shown in FIG. 2, the notch 89 for fire transfer communicates the two combustion parts 34, 34 separated by the air flow path member 35 when a large number of burner units 30 are arranged in the case member 11. Yes, it is used to assist in the transfer of fire between the two combustion parts 34, 34.

  The protruding portions 83a and 84a protrude toward the upper end portions 80a and 81a to the same extent as the bending positions of the engaging pieces 85 and 86 described above, or to the extent that they do not reach this position slightly. As shown in FIG. 17 (b), the engagement piece 85b existing at a position adjacent to the notch 83 on the first partition wall structure 80 side is formed on the protrusion 84a provided on the second partition wall structure 80 side. It is folded to the first partition structure 80 side so as to be covered, and a so-called goblet folded state is obtained. Thereby, the protruding portion 84a is folded by the engagement piece 85b. And as shown in FIG.17 (b), most of the clearance gaps s formed inside the bent engagement piece 85b will be in the state obstruct | occluded in the edge part by the side of the notch 83. FIG.

  Similarly, the engagement piece 86b existing at a position adjacent to the notch 84 on the second partition wall structure 81 side is bent so as to cover the protrusion 83a provided on the first partition wall structure 80 side. Accordingly, the protruding portion 83a is folded by the engaging piece 86b, and the majority of the gap s formed inside the bent portion of the engaging piece 85b is closed by the protruding portion 83a.

  As shown in FIGS. 14 and 15, long slits 92 and 93 (openings) are provided in the region A described above. The long slits 92 and 92 are slits extending from substantially the center in the width direction of the engagement notches 87 and 88 to the lower side of the first and second partition members 80 and 81, respectively. The long slits 92 and 93 each extend to the extent that the ends slightly exceed the mountain fold L2 described above. That is, the long slits 92 and 92 linearly extend downward from the engaging portion 90 of the air flow path member 35 beyond the inclined surface 91 as shown in FIG.

  In a region sandwiched between the valley folds L1 and the mountain folds L2 of the first partition members 80 and 81, that is, in the portion constituting the inclined surface 91 in the air flow path member 35, a number of short slits 95 and 96 ( Opening) and openings 97, 98 are provided. As shown in FIG. 14C and FIG. 15C, the short slits 95 and 96 pass through substantially the center in the width direction of the portion where the engagement pieces 85 and 86 are provided, and the imaginary line V extending in the vertical direction. It exists above or in the vicinity. The short slits 95 and 96 extend linearly from the vicinity of the valley fold L1 to a position slightly beyond the mountain fold L2.

  As shown in FIGS. 12, 14, 15, etc., the openings 97 and 98 are formed in the region between the valley fold portion L <b> 1 and the mountain fold portion L <b> 2, that is, on the tip (upper end) side of the air flow path member 35. A large number of first and second partition members 80 and 81 are provided in a row on the inclined surface 91 provided in the longitudinal direction. The openings 97 and 98 are provided in each region shifted downward from the portion where the engagement pieces 85 and 86 are provided so as to have a symmetrical positional relationship via the short slits 95 and 96 or the virtual line V. Yes.

  The openings 97 and 98 are not provided in the regions on the extensions of the notches 83 and 84 described above, that is, in the regions indicated by hatching H3 in FIG. 14C and FIG. In other words, the openings 97 and 98 are provided at positions outside the region on the extension of the notches 83 and 84.

  Further, in the region A, below the long slits 92 and 93 and the short slits 95 and 96 (on the base end side), a plurality of horizontal concave grooves 100 and 101 and a number of vertical concave grooves 102 are provided. 103, round recesses 105 and 106, and long recesses 107 and 108 are provided. The lateral grooves 100 and 101 extend linearly in the longitudinal direction (width direction) of the first and second partition member 80 and 81, respectively. A plurality of lateral concave grooves 100 and 101 are provided in a row at predetermined intervals in the width direction of the first and second partition wall constituting members 80 and 81, respectively. Further, each of the horizontal concave grooves 100 and 101 is recessed from the outer surface to the inner surface in the assembled state of the air flow path member 35.

  The round recess 105 and the long recess 107 are respectively provided in the first partition wall structure 80, and the round recess 106 and the long recess 108 are respectively provided in the second partition wall structure 81. The circular recesses 105 and 106 are substantially circular recesses in plan view provided in the first and second partition wall constituting members 80 and 81, and are recessed from the outside to the inside of the air flow path member 35. Two round recesses 105, 106 are provided on the lower end side of the region A of the first and second partition members 80, 81. The round recesses 105 and 106 extend from both longitudinal ends of the first and second partition wall structural members 80 and 81 to the width of the first partition wall structure 80 (the length in the left-right direction in the state shown in FIGS. 14 and 15). On the other hand, it is provided at a position shifted about 1/3 to the center side.

  The long concave portions 107 and 108 are provided in the first and second partition member 80 and 81, and are concave portions having a streamline shape as shown in FIGS. The long recesses 107 and 108 are also recessed toward the inside of the air flow path member 35 in the same manner as the round recesses 105 and 106. The shape of the long concave portions 107 and 108 will be described in detail. The long concave portions 107 and 108 are formed by arranging a great circle and a small circle with their centers separated in the vertical direction and connecting the two with a common tangent. It has substantially the same planar shape as the extended shape. The long concave portions 107 and 108 are arranged so that the large circle side portion faces the lower side (base end side) of the air flow path member 35 and the small circle side portion faces the upper side (tip end side). Further, the common tangent line connecting the two circles constituting the outer extension of the long recesses 107 and 108 has an inclination of 30 ° or less with respect to the line connecting the centers of the circles.

  The longitudinal grooves 102 and 103 are provided in the first and second partition wall constituting members 80 and 81, respectively. In the height direction of the first and second partition wall constituting members 80 and 81, that is, in the state shown in FIGS. It extends linearly in the vertical direction and is provided below the lateral grooves 100 and 101. In addition, a large number of the longitudinal grooves 102 and 103 are provided so as to be arranged substantially in parallel at a predetermined interval in the longitudinal direction of the first and second partition members 80 and 81, respectively. Of the longitudinal grooves 102 and 103, those having the above-described round recesses 105 and 106 and long recesses 107 and 108 on their extensions are shorter than the others so that they only reach these recesses. ing.

The first and second partition members 80 and 81 have stepped portions 110 and 111 as shown in FIG. 12 and FIGS. The step portions 110 and 111 are provided so as to extend linearly in the longitudinal direction of the first and second partition wall constituting members 80 and 81 as shown in FIGS. As shown in FIGS. 13 and 16, the first and second partition members 80 and 81 have portions corresponding to the region B with the stepped portions 110 and 111 as boundaries in the assembled state as the air flow path member 35. It is formed so as to bulge outward with respect to the portion corresponding to. Further, the stepped portions 110 and 111 are
As it goes to the outside of the air flow path member 35, it is gently inclined downward (base end side). Furthermore, as shown in FIGS. 12, 14, 15, etc., a large number of openings 112, 113 are arranged in rows in the longitudinal direction of the first and second partition members 80, 81 in the step portions 110, 111. Is provided.

  As shown in FIGS. 5 and 12, etc., a plurality of protrusions 115 and 116 are provided in the region B of the first and second partition members 80 and 81, respectively. As will be described later in detail, the protrusions 115 and 116 are in contact with the outer surface of the intermediate member 36 to form a gap therebetween. As shown in FIG. 12 and the like, the protrusions 115 and 116 linearly extend in the up-down direction in a state assembled as the air flow path member 35 and project outward.

  Under the protrusions 115 and 116, recesses 117 and 118 are provided. The recessed portions 117 and 118 are portions that are recessed in a substantially mountain shape toward the inside in the assembled state of the air flow path member 35. In addition, the recessed portions 117 and 118 are recessed so that portions corresponding to the ridge lines are directed in the longitudinal direction of the first and second partition members 80 and 81.

  The recesses 117 and 118 have an upper part and a lower part with the above-described ridge line part as a boundary. The upper portions of the recesses 117 and 118 are gently inclined so as to go inward as the air flow path member 35 is moved downward, and constitute a surface facing downward. Moreover, the part below the ridgeline part of the recessed parts 117 and 118 is inclined gently so that it may protrude outside as it goes below the air flow path member 35, and the surface which faced upward is comprised. .

  In the recesses 117 and 118, openings 119 and 120 are provided on the surface below the above-described ridge line portion. Here, as described above, the surface below the recesses 117 and 118 is inclined downward. Therefore, the openings 119 and 120 are also opened toward the lower side in the state where the air flow path member 35 is installed as shown in FIG.

  As shown in FIGS. 14 and 15, longitudinal concave grooves 121 and 122 are provided in a region C corresponding to the lower end (base end) side of the first and second partition members 80 and 81. The longitudinal concave grooves 121 and 122 are grooves that extend linearly in the vertical direction of the first and second partition members 80 and 81, respectively. In addition, lateral concave grooves 123 and 125 are provided below the vertical concave grooves 121 and 122. The lateral grooves 123 and 125 extend over the entire length in the longitudinal direction of the first and second partition members 80 and 81, respectively. The lateral concave grooves 123 and 125 are used for alignment with these members when the burner unit 30 and the combustion apparatus 10 are combined with the premixing member 32 and the flame hole member 33, respectively. The vertical concave grooves 121 and 122 and the horizontal concave grooves 123 and 125 are both recessed inward from the surface side in the assembled state of the air flow path member 35.

  As described above, the air flow path member 35 is configured by combining the first and second partition members 80 and 81. That is, as shown in FIG. 16, the air flow path member 35 is in a state where the first and second partition members 80 and 81 are opposed to each other, and the engagement pieces 85 and 86 provided on the upper ends 80a and 81a are provided. The front end side is integrated by engaging with the notches 88 and 87 for engagement.

  More specifically, when the first and second partition members 80 and 81 are in a state where both ends in the longitudinal direction are aligned, the second partition member 80 and 81 are located at the positions where the engagement pieces 85 are provided in the first partition member 80. The engagement notch 88 provided in the partition wall structure 81 arrives, and the engagement notch 87 provided in the first partition wall structure 80 arrives at the position where the engagement piece 86 is provided in the second partition wall structure 81. . In this state, as shown in FIG. 12, the engagement piece 85 on the first partition wall configuration body 80 side is folded toward the second partition wall configuration body 81 side, and the upper end portion 81 a of the second partition wall configuration body 81 is folded. It is said. Similarly, the engagement piece 86 on the second partition wall structure 81 side is bent toward the first partition wall structure 80 side, and the upper end portion 80a of the first partition wall structure 80 is folded.

  The portion where the upper end portion 81a of the second partition wall constituting body 81 is folded by the engaging piece 85 and the portion where the upper end portion 80a of the first partition wall constituting body 80 is folded by the engaging piece 86 are caulked. . Thereby, the 1st engaging part 90a and the 2nd engaging part 90b are formed. Further, the first and second engaging portions 90a and 90b formed as described above are alternately arranged in the longitudinal direction of the air flow path member 35 as shown in FIG. And the front end side of the air flow path member 35 is closed.

  Further, the flanges 80c and 80d provided at both longitudinal ends of the first partition wall structure 80 are in surface contact with the flanges 81c and 81d provided on the second partition wall structure 81, respectively. Then, the hatched portions in FIG. 15A of the flanges 81c and 81d are bent toward the flanges 80c and 80d and caulked. As a result, the first and second partition members 80 and 81 are engaged at both longitudinal ends of the air flow path member 35.

  When the first and second partition members 80 and 81 are integrated as described above, as shown in FIG. 12 and FIG. A notch 89 for fire transfer is formed. The notch portion for fire transfer 89 is a notch 83 provided in the engagement pieces 85, 86 (engagement pieces 85a, 86a) that are present at substantially the center of the upper ends 80a, 81a of the first and second partition members 80, 81. , 84 are formed together and serve to communicate the region facing the first partition member structure 80 divided by the air flow path member 35 and the region facing the second partition member structure 81. . In the present embodiment, as will be described in detail later, the air flow path member 35 is disposed between the combustion portions 34 and 34 of the burner units 30 and 30 disposed adjacent to each other in the combustion apparatus 10. Therefore, in the combustion apparatus 10, the notch portion for fire transfer 89 communicates the adjacent combustion portions 34, 34 with each other at the front end side of the air flow path member 35 and at the substantially central portion in the longitudinal direction of the air flow path member 35. It plays the role of assisting the transfer of fire between the combustion parts 34, 34.

  Further, as described above, the gap s (see FIG. 17) formed in the bent portions of the engaging pieces 85 and 86 existing at positions adjacent to the fire transfer notch 89 is mostly formed by the protrusions 83a and 84a. Is blocked.

  When the first and second partition structural members 80 and 81 are integrated as described above, a wall-shaped air flow path member 35 as shown in FIG. 12 is formed. Here, as described above, the first and second partition structural members 80 and 81 are bent at the valley fold portion L1 and the mountain fold portion L2, or have step portions 110 and 111, and the like. Therefore, when the first and second partition member 80, 81 are engaged and integrated by the upper end portions 80a, 81a, the flange portions 80c, 81c, and the flange portions 80d, 81d as described above, as shown in FIG. In addition, an air flow path 82 is formed inside the air flow path member 35.

  As shown in FIG. 13, the air flow path 82 is a space that extends from the base end (lower end) of the air flow path member 35 to the front end (upper end) and has a narrow front end. Is open downward. More specifically, as shown in FIG. 12 and FIG. 13, the air flow path member 35 is moved in the height direction from the distal end side to the proximal end side in the distal end region 130, the intermediate region 131, and the proximal end region 132. When classified into three regions, the distances W1 and W3 (channel cross-sectional areas) of the first and second partition wall structural members 80 and 81 in the distal end region 130 and the proximal end region 132 are both in the vertical direction, that is, the air channel in the illustrated state. The distance W1 between the distal end regions 130 is approximately 1/3 of the interval W3 between the proximal end regions 132.

  That is, the distal end region 130 is a portion corresponding to the region A on the upper end portions 80a and 81a side in the first and second partition members 80 and 81, and the proximal end region 132 is the region C on the lower end portions 80b and 81b side. It is a part corresponding to. As shown in FIG. 12 and FIG. 13 and the like, the first and second partition constituting members 80 and 81 bulge toward the outside of the air flow path member 35 at the valley fold portion L1 and the step portions 110 and 111. The channel cross-sectional area of the proximal end region 132 corresponding to the divided region C is smaller than that of the distal end region 130 corresponding to the region A. In the present embodiment, in the air flow channel 82, the interval W1 in the distal end region 130 is narrowed to about ３ of the interval W3 in the proximal end region 132.

  The intermediate region 131 is located in the middle of the above-described tip region 130 and the lower end region 132, and is a region configured by a portion corresponding to the region B in the first and second partition members 80 and 81. As shown in FIG. 13 and the like, the intermediate region 131 has a substantially tapered cross section. That is, in the state shown in FIG. 13, the intermediate region 131 has a tapered shape in which the cross-sectional shape is wide at the bottom (base end side) and the interval is narrowed toward the top (tip end side). However, a bulging portion 135 is provided at the boundary portion between the tip end portion of the taper and the tip region 130. As for the outer wall part which comprises the bulging part 135, the front and back part is parallel.

  In the air flow path member 35, the air flow path 82 is opened at the lower end portion of the proximal end region 132, and the open portion functions as an air inlet 133 for the air flow path 82 formed inside. The air flow path member 35 allows the air introduced into the air flow path 82 through the air introduction port 133 to pass through a large number of openings provided in the first and second partition wall structures 80 and 81. Separately, it can be supplied to three areas.

  More specifically, the air flow path member 35 has openings 97, 98 provided on the upper end portions 80a, 81a side of the first and second partition members 80, 81 on the front end side, long slits 92, 93, short The air flow path 82 communicates with the outside through the slits 95 and 96. The openings 97, 98, the long slits 92, 93, and the short slits 95, 96 are the combustion section 34 provided at a position adjacent to the air flow path member 35, and are on the front end side of the air flow path member 35. It functions as an air supply opening to a region (hereinafter referred to as a second combustion region 34b as required).

  In addition, the air flow path member 35 communicates with the outside through the openings 112 and 113 provided in the step portions 110 and 111 of the region B constituting the intermediate region 131. As shown in FIG. 4 and the like, the stepped portions 110 and 111 are combustion portions formed between the adjacent air flow path members 35 and 35 when the air flow path member 35 is assembled to the combustion device 10 or the burner unit 30. 34, it functions as an opening for supplying air to a region located on the flame hole member 33 side (hereinafter referred to as a first combustion region 34a as necessary).

  Further, the air flow path member 35 is connected to the air flow path 82 via the openings 119 and 120 provided in the recesses 117 and 118 in the vicinity of the boundary between the regions B and C of the first and second partition members 80 and 81. Is in communication with the outside. As shown in FIG. 4 and the like, the recesses 117 and 118 exist at positions facing the side surfaces of the intermediate member 36 when the air flow path member 35 is assembled to the combustion device 10 or the burner unit 30. The air flow path member 35 communicates with a gap 140 formed between the side surface of the intermediate member 36 and the air flow path member 35 through the openings 119 and 120.

  Then, the structure of the combustion apparatus 10 and the burner unit 30 is demonstrated. The combustion device 10 and the burner unit 30 are configured by integrating the premixing member 32, the flame hole member 33, and the air flow path member 35 described above. As shown in FIGS. 3 and 4, the burner unit 30 has air flow path members 35, 35 arranged on both sides of an intermediate member 36 formed by integrating the premixing member 32 and the flame hole member 33. It has been configured.

  As shown in FIGS. 5 and 6, the intermediate member 36 is configured by inserting the premixing member 32 into the opening provided on the lower end side of the flame hole member 33 with the top portion 46 side as the head and integrating them. ing. As a result, the top 46 side of the premixing member 32 is inserted into the hollow portion formed in the flame hole member 33.

  Here, as shown in FIGS. 5 and 7, flange portions 42 are provided at both longitudinal ends of the premixing member 32. As shown in FIGS. 5 and 10, slits 52 extending from the lower end side of the flame hole member 33 to the middle portion in the height direction are provided at both ends in the longitudinal direction of the flame hole member 33. Therefore, when the premixing member 32 is inserted into the flame hole member 33, the flange portion 42 provided on the premixing member 32 fits into the slit 52 provided on the flame hole member 33. Then, when the premixing member 32 is inserted until the flange portion 42 comes into contact with the back end of the slit 52, the premixing member 32 and the flame hole member 33 are positioned in the insertion direction. When the premixing member 32 is inserted into the flame hole member 33 and integrated in this way, as shown in FIG. 4, the space 136 is located inside the flame hole member 33 and above the top 46 of the premixing member 32. Is formed. The space 136 is formed in a portion corresponding to the throttle portion 62 and the downward bulging portion 66 of the flame hole member 33.

  As shown in FIG. 4, when the premixing member 32 is inserted into the flame hole member 33 to form the intermediate member 36, the vertical wall 49 constituting the lower step portion 38 b of the opening row portion 38 of the premixing member 32, 49 is in contact with the inner walls of the lower restrictors 63, 63 provided on the lower side of the flame hole member 33, and is positioned. In this state, of the opening row portion 38 of the premixing member 32, the upper step portion 38 a arrives at a position corresponding to the lower bulging portion 66 of the flame hole member 33. A gap 137 is formed between the upper step portion 38 a and the downward bulging portion 66. The gap 137 communicates over substantially the entire length of the intermediate member 36 in the longitudinal direction. Further, the gap 137 communicates with the above-described space 136, that is, a region inside the throttle portion 62 and the downward bulging portion 66 of the flame hole member 33, and constitutes a flame hole upstream flow path 138.

  When attention is paid to the gap between the opening row portion 38 of the premixing member 32 and the flame hole member 33, the upper stage of the opening row portion 38 is formed in the lower bulging portion 66 of the side wall portions 31 and 32 of the flame hole member 33 as described above. There is a portion 38a. That is, in the state where the premixing member 32 and the flame hole member 33 are integrated to form the intermediate member 36, the openings 48 provided in a row in the opening row portion 38 of the premixing member 32 are located below the flame hole member 33. Arrives at a position corresponding to the bulging portion 66. Further, a gap 137 is formed between the upper step portion 38 a and the downward bulging portion 66. Therefore, in the intermediate member 36, the internal space of the premixing member 32 communicates with a gap 137 formed between the flame hole member 33 and the premixing member 32 through the opening 48.

  As shown in FIG. 4, most of the gap 137 is closed in the vicinity of the boundary portion between the throttle portion 63 and the downward bulging portion 66 of the flame hole member 33. That is, as described above, in the state where the premixing member 32 and the flame hole member 33 are integrated, the vertical wall 49 constituting the lower step portion 38b of the premixing member 32 constitutes the throttle portion 63 of the flame hole member 33. There is almost no gap between them.

  On the other hand, the gap 137 swells on the proximal side of the flame hole member 33 through a groove formed on the back side of the protrusion 64 provided in the throttle portion 63 of the flame hole member 33, that is, on the inner side of the flame hole member 33. It is in a state of communicating with the exit part. Further, there is a gap between the base end portion of the flame hole member 33 and the premixing member 32. Therefore, the above-described gap 137 communicates with the outside via a groove provided on the back side of the protrusion 64 and a gap formed on the base end side of the flame hole member 33, and through the communicating portion. Air can be taken in. That is, the gap formed on the base end side of the flame hole member 33 functions as an air inlet 143 for taking air into the gap 137.

  Here, paying attention to the positional relationship between the position of the protrusion 64 provided in the flame hole member 33 and the opening 48 provided in the opening row portion 38 of the premixing member 32, as shown in FIG. There is an opening 48 just above the strip 64. That is, the opening 48 is provided on the extension line of the position where the protrusion 64 is provided. Therefore, when a gas (premixed gas) is supplied from the inside of the premixing member 32 toward the gap 137 through the opening 48, the gas is supplied to the groove or the flame hole member 33 provided on the back side of the protrusion 64. It can be made to merge with the airflow taken in through the clearance gap formed in the base end part side.

  As shown in FIGS. 3 and 4, air flow path members 35, 35 are mounted on both sides of the intermediate member 36. The air flow path member 35 is fixed in a state of being positioned with respect to the intermediate member 36 by fitting the fitting concave grooves 72 and 72 of the flame hole member 33 to the air introduction port 133 on the proximal end side. Yes.

  More specifically, the air flow path member 35 is inserted until the base end side portion abuts on the bottom wall 72 a in the fitting groove 72. As a result, the base end portion of the air flow path member 35 is fitted into the fitting groove 72. That is, when the base end portion of the air flow path member 35 is inserted into the fitting concave groove 72, the base end portion of the air flow path member 35 is in surface contact with the outer wall portion of the base end portion of the flame hole member 33. At the same time, the inner surface of the lateral groove 123 provided on the proximal end side of the air flow path member 35 is in surface contact with the outer wall 72 b of the fitting groove 72. As a result, the air flow path member 35 is fixed to the intermediate member 36.

  When the air flow path member 35 is installed on both sides of the intermediate member 36 as described above, the air flow path member 35 is in a state in which the protrusions 115 and 116 are partially in contact with the flame hole member 33. . On the other hand, as shown in FIG. 4, a gap 140 is formed between the air flow path member 35 and the flame hole member 33 in a portion excluding the contact portion.

  The gap 140 communicates with the combustion portion 34 formed above the top surface 55 of the flame hole member 33 in the posture shown in FIG. 4. On the other hand, the gap 140 is blocked by the bottom wall 72a of the fitting concave grooves 72, 72, and therefore does not communicate with the outside on the base end side. In addition, the air flow path 82 formed inside the air flow path member 35 communicates with the gap 140 via openings 119 and 120 provided in the intermediate region 131 of the air flow path member 35.

  Then, the function of the hot water supply apparatus 1, the combustion apparatus 10, and the burner unit 30 is demonstrated. As shown in FIG. 2, in the hot water supply device 1, a large number of air flow path members 35 and intermediate members 36 are alternately arranged in the case member 11, and the case combustion device 10 and the burner unit 30 are formed. As described above, each burner unit 30 shares the air flow path member 35 with the adjacent burner unit 30 in the state of being disposed in the case member 11. Therefore, the combustion apparatus 10 is configured such that the air flow path member 35 is disposed between the intermediate members 36 disposed in the case member 11.

  When the combustion apparatus 10 and the burner unit 30 are formed in the case member 11 as described above, the intermediate member 36 is placed between the adjacent air flow path members 35 and 35 as shown in FIG. The combustion part 34 is formed above the top surface 55 of the flame hole member 33 which comprises. As shown in FIG. 4, the combustion unit 34 is roughly divided into a first combustion region 34 a on the top surface 55 side and a second combustion region 34 b on the tip side of the air flow path member 35.

  The burner unit 30 is configured to realize so-called two-stage combustion. That is, the burner unit 30 combusts the premixed gas supplied from the flame hole member 33 to the combustion section 34 under the amount of air smaller than the theoretical amount of air in the first combustion region 34a, and the first combustion. In the combustion in the region 34a, the air is supplied to the second combustion region 34b and burned by supplying more air than the amount of air that is insufficient to completely burn the premixed gas. In the burner unit 30 of the present embodiment, air and fuel gas flow through various routes in order to realize two-stage combustion.

  As shown in FIG. 1, the hot water supply device 1 has a blower unit 3 below the combustion device 10, and when the blower unit 3 is activated, the combustion device 10 disposed in the interior from the bottom side of the case member 11. Air is supplied. Further, the fuel gas is supplied by the gas nozzle 8 provided at the position facing the case member 11, and supplied to the gas inlet 40 provided in the premixing member 32 of each burner unit 30.

  The air and fuel gas supplied to each burner unit 30 as described above flow as shown by arrows in FIGS. More specifically, the flow of air and fuel gas supplied to the burner unit 30 in accordance with the operation of the blower means 3 is roughly divided into three routes of first to third air flow routes P, Q, and R. Further, the first air flow route P is further subdivided into three routes P1 to P3, and the second air flow route Q is subdivided into routes Q1 and Q2.

  That is, the first air flow route P is a route for supplying air to various parts of the burner unit 30 via the air flow path 82 formed in the air flow path member 35 as indicated by hatching or an arrow in FIG. is there. Further, the second air flow route Q is a route that flows inside the intermediate member 36 as indicated by hatching or an arrow in FIG. The third air flow route R is a route through which primary air and fuel gas flow, and is a route through which the gas flows from the gas inlet 40 of the premixing member 32 as indicated by arrows and hatching in FIG.

  As described above, the first airflow route P is roughly divided into routes P1 to P3. As shown by hatching or arrow P1 in FIG. 18, the route P1 passes through the air flow path member 35 and the openings 97, 98, long slits 92, 93, and short slits 95, 96 provided on the tip side. This is a flow path leading to the combustion unit 34. The route P1 is a route for mainly supplying the air introduced from the air inlet 133 of the air flow path member 35 to the second combustion region 34b of the combustion unit 34.

  Here, as shown in FIG. 4 and FIG. 18, in the burner unit 30 of the present embodiment, the air flow path member 35 has a substantially constant flow path cross-sectional area, but has an inclined surface 91, 94 and has a tapered shape. Therefore, in the burner unit 30, the air flowing through the air flow path member 35 stays at the tip portion or becomes in a turbulent state, and the air flow supplied to the combustion unit 34 through the air flow route R <b> 1. There is a possibility that the flame becomes unstable or the flame formed in the second combustion region 34b (hereinafter referred to as a secondary flame as necessary) fluctuates. Further, as described above, when the air flow or the secondary flame becomes unstable, there is a possibility that the noise generated with the combustion operation becomes high.

  However, in the air flow path member 35 employed in the burner unit 30 of this embodiment, the long slits 92 and 93 and the short slits 95 and 96 are provided over almost the entire area of the inclined surfaces 91 and 94. Therefore, in the burner unit 30, it is difficult for the air flowing in the air flow path member 35 to stay in the tip portion as described above or to be in a turbulent state. Therefore, in the burner unit 30, the air flow supplied to the combustion unit 34 via the route P1 and the secondary flame formed in the second combustion region 34b are stable, and the noise generated with the combustion operation is small.

  As shown by hatching or arrow P2 in FIG. 18, the route P2 flows through the air flow path 82, and the openings 112 and 113 provided in the inclined surfaces 110 and 111 at the upper end portion of the intermediate region 131 of the air flow path member 35. Through the first combustion region 34a of the combustion section 34. The air ejected from the openings 112 and 113 flows obliquely upward with respect to the axis of the burner unit 30 in the state shown in FIG.

  The route P3 passes through the air flow path 82 as shown by hatching or an arrow P3 in FIG. , 120 to the gap 140 formed between the air flow path member 35 and the intermediate member 36 (flame hole member 33). Here, as described above, the gap 140 communicates with the combustion unit 34 between the decompression wall 51 of the flame hole member 33 and the air flow path member 35. Therefore, the air flowing through the route P3 finally reaches the combustion unit 34 through the gap 140.

  Subsequently, the second air flow route Q will be described. The second airflow route Q is roughly divided into routes Q1 and Q2. A route Q1 is a route indicated by hatching or an arrow Q1 in FIG. That is, the route Q <b> 1 flows through the inside of the intermediate member 36, i.e., the gap 137, through the air inlet 143 formed on the proximal end side of the flame hole member 33 constituting the intermediate member 36. The route reaches the space 136 formed above the top portion 46 of the premixing member 32 and reaches the first combustion region 34a of the combustion portion 34 through the flame hole 60 formed in the top portion 55 of the flame hole member 33. . The route Q2 extends from the air inlet 143 through the gap 137 to the space 136, and is formed between the main body member 50 and the decompression wall 51 from the opening 67 provided in the main body member 50 of the flame hole member 33 forming the space 136. This is a route that reaches the combustion section 34 through the formed gap 75.

  Here, in the cross section at the site shown in FIG. 19, in the routes Q1 and Q2, the premixing member 32 and the flame hole member 33 are in surface contact at the position of the throttle part 63 of the flame hole member 33, and the vertical direction Not communicating with However, as described above, the flame hole member 33 includes a plurality of protrusions 64 and 64 in which the base end side portion and the lower bulging portion 66 thereabove are provided at positions corresponding to the throttle portion 63. It communicates in the up-and-down direction through a groove formed on the back side. Therefore, the air supplied through the routes Q1 and Q2 is introduced from the air introduction port 143 on the proximal end side of the flame hole member 33, and then as shown by a two-dot chain line in FIG. , 64 through the groove on the back side to reach the gap 137.

  Next, the third air flow route R will be described. The third air flow route R is a route in which primary air and fuel gas flow inside the premixing member 32 and merge with the route Q described above in a gap 137 formed outside the premixing member 32. More specifically, the third air flow route R starts from the gas introduction port 40 of the premixing member 32 and is provided in the opening row portion 38 through the mixing flow path 37 and the opening row portion 38 of the premixing member 32. This is a route from many openings 48 to the gap 137. The primary air and fuel gas flowing through the third air flow route R are mixed while passing through the mixing flow path 37 and the like to become a premixed gas.

  Then, in this embodiment, the operation | movement in case the burner unit 30 which comprises the combustion apparatus 10 performs a combustion action is demonstrated. When the burner unit 30 performs a combustion operation in the combustion device 10, the blower unit 3 is activated, and outside air (air) is introduced into the case member 11 of the combustion device 10. In parallel with this, the fuel gas is introduced into the case member 11 from the gas nozzle 8.

  The air and fuel gas introduced into the case member 11 are supplied to various parts of the burner unit 30 through the first to third air flow routes P, Q, and R described above. That is, a part of the air introduced into the case member 11 flows into the air flow path 82 from the air introduction port 133 provided at the base end portion of the air flow path member 35. Then, a part of the air flowing into the air flow path 82 passes through the route P1 of the first air flow route P described above to the second combustion region 34b of the combustion unit 34, as indicated by an arrow P1 in FIG. Supplied. Further, a part of the air flowing into the air flow path 82 passes through the route P2 to the inclined surfaces 110 and 111 of the air flow path 35 located on the base side of the combustion section 34 as indicated by an arrow P2 in FIG. It is supplied to the first combustion region 34a from the provided openings 112 and 113. Further, the remaining portion of the air flowing into the air flow path 82 is supplied to a position adjacent to the side flame holes 76 and 76 provided in the flame hole member 33 via the route P3 as indicated by an arrow P3 in FIG. .

  Further, part of the air introduced into the case member 11 and the fuel gas are premixed via the third air flow route R formed by the premixing member 32 to become a premixed gas. The premixed gas passes through the opening 48 provided in the opening row portion 38 of the premixing member 32, and the gap 137 formed between the premixing member 32 and the flame hole member 33, that is, the second airflow. Supplied to the path Q.

  The premixed gas supplied to the gap 137 flows in from the air introduction port 143 provided on the base end side of the flame hole member 33 and merges with the airflow flowing through the second airflow route Q. Thereafter, the premixed gas combined with the airflow flows into the space 136 formed above the premixing member 32 and spreads over the entire space 136. As a result, the premixed gas formed in the third airflow route R is further mixed with the air flowing through the second airflow route Q. A part of the premixed gas existing in the space 136 is discharged toward the combustion unit 34 from the flame hole 60 provided in the top surface 55 of the flame hole member 33 as shown by the route Q1 described above. . On the other hand, the remaining portion of the premixed gas existing in the space 136 flows out from the opening 67 provided in the main body member 50 constituting the flame hole member 33 into the gap 75 formed between the main body member 50 and the decompression wall 51. The gas is discharged from the side flame hole 76 toward the combustion unit 34.

  More specifically, air (primary air) or fuel gas introduced into the case member 11 is introduced from the gas introduction port 40 of the premixing member 32 and flows through the mixing flow path 37. Here, as shown in FIGS. 5 and 7, etc., there are a throttle portion 41, an enlarged diameter portion 43, etc. in the middle of the mixing flow path 37, and the flow path cross-sectional area advances in the flow direction of air or fuel gas. It is supposed to change. Therefore, air and fuel gas are gradually mixed while flowing through the mixing flow path 37, and eventually become premixed gas. Then, the premixed gas flows into the opening row portion 38 provided above the mixing channel 37. Here, in the example shown in the present embodiment, the mixing channel 37 does not have a portion that becomes a constriction between the uniform cross section 45 and the opening row portion 38, that is, a portion having a small channel cross-sectional area. Therefore, the premixed gas flowing through the mixing flow path 37 enters the opening row portion 38 at a substantially uniform flow rate and spreads substantially uniformly in the opening row portion 38 regardless of the flow site.

  The premixed gas that has entered the opening row portion 38 is discharged from each opening 48 substantially uniformly toward the outside of the premixing member 32. That is, the opening row portion 38 has a considerable internal volume. Therefore, even if a minute vortex is generated in the flow of the premixed gas when passing through the curved path of the premixing member 32, the vortex is generated when air or fuel gas flows into the opening row portion 38. Converged at. Further, since there is no portion to be throttled immediately before the opening row portion 38, variation in the flow velocity of the premixed gas introduced into the opening row portion 38 is small. Therefore, the premixed gas that has flowed into the opening row portion 38 has little pressure variation. Accordingly, the premixed gas is evenly discharged from each opening 48. The fuel gas discharged from each opening 48 enters the gap 137 formed by the lower bulging portion 66 of the flame hole member 33 and is mixed with the air flowing through the second gas route Q described above.

  On the other hand, the air flowing through the second gas route Q, that is, the gap 137 flows upward from the lower side of the drawing and is rectified. That is, the air flowing into the gap 137 and flowing through the second gas route Q is introduced from the air inlet 143 provided on the proximal end side of the flame hole member 33 as shown in FIG. The air passes through a concave groove formed on the back side of the protrusion 64 provided in the throttle portion 63 of the flame hole member 33 and linearly extending in the vertical direction. Therefore, the air taken in from the air inlet 143 side is rectified into the gap 137 and supplied in a laminar flow state from the lower side (base end side) to the upper side (tip end side).

  Here, as shown in FIG. 19, air flows in the vertical direction in the gap 137 constituting the second gas route Q, whereas the air flows through the opening 48 of the opening row portion 38 provided in the premixing member 32. The premixed gas that merges from the third gas route R to the second gas route Q crosses the air flow in the gap 137 of the second gas route Q (in the present embodiment, the direction that is substantially orthogonal). Flowing. Therefore, the premixed gas released from the opening 48 of the opening row portion 38 collides violently when joining the air flowing through the gap 137, and the premixed gas and the air flowing through the gap 137 are sufficiently mixed.

  Furthermore, in this embodiment, in a state where the premixing member 32 and the flame hole member 33 are integrated to form the intermediate member 36, an opening row is formed on the extension line of the protrusion 64 provided on the side of the flame hole member 33. The opening 48 of the part 38 is configured to arrive. Therefore, the air flow passing through the concave groove formed on the back side of the protrusion 64 surely intersects and collides with the flow of the premixed gas discharged from the opening 48 of the flame hole member 33, and the premixed gas and air Stream mixing is further promoted. Further, since the gap 137 communicates over the entire region in the longitudinal direction of the opening row portion 38, the pressure of the mixture of premixed gas and air (hereinafter collectively referred to as premixed gas) is also smoothed.

  The premixed gas flowing through the gap 137 flows further downstream, that is, upward in the illustrated state, and flows into a space 136 formed above the premixing member 32. When the premixed gas flows into the space 136, mixing is promoted. Most of the premixed gas flowing into the space 136 is discharged from the slits forming the flame holes 60 to the first combustion region 34a of the combustion unit 34 at a substantially uniform flow rate regardless of the part. On the other hand, the remaining portion of the air that has entered the space 136 is discharged from the opening 67 provided on the side of the main body member 50, enters the gap 75 between the main body member 50 and the decompression wall 51, and is opened upward. 76 is discharged into the first combustion region 34 a of the combustion section 34.

  When the premixed gas is released from the flame hole 60 or the side flame hole 76 as described above, the premixed gas is ignited. When the premixed gas discharged from the flame hole 60 is ignited, as shown in FIGS. 4 and 18 to 20, primary combustion is performed in the first combustion region 34 a of the combustion unit 34 to form a primary flame.

  Here, the premixed gas used for primary combustion is the amount of air required for complete combustion of the fuel gas contained in the premixed gas (hereinafter referred to as the theoretical air amount). ) In addition, air discharged from the openings 112 and 113 provided in the inclined surfaces 110 and 111 of the air flow path member 35 is supplementarily supplied to the primary flame side during the primary combustion, but the supply amount of the air is taken into consideration. Even so, the amount of air supplied for primary combustion does not reach the theoretical amount of air. Therefore, in the primary combustion in the first combustion region 34a, part of the fuel gas contained in the premixed gas is burned, and the remaining part is present in the unburned state downstream, that is, on the tip side of the burner unit 30. It flows toward the second combustion region 34b side.

  On the other hand, the primary flame formed by the primary combustion is held by the flame formed by the combustion of the premixed gas discharged from the side flame holes 76 and 76 provided on both sides of the flame hole 60. The premixed gas released from the side flame holes 76, 76 is completely burned in the presence of air supplied through the gap 140 opened toward the base end portion of the first combustion region 34 a of the combustion portion 34. A flame that is sufficiently smaller than the primary flame is formed at the base end of the primary flame.

  That is, in the present embodiment, a part of the premixed gas is released from the side flame holes 76 to the first combustion region 34 a, and the flow rate of the premixed gas is that of the premixed gas released from the flame holes 60. Slow enough compared to the flow rate. More specifically, the premixed gas discharged from the side flame hole 76 is formed by a gap formed between the main body member 50 and the decompression wall 51 from the opening 67 provided in the main body member 50 of the flame hole member 33. 75. Here, as shown in FIG. 11 and the like, the gap 75 is slit-shaped and very narrow, so the amount of the premixed gas that enters the gap 75 and is released from the side flame holes 76 is very small. Further, the side flame hole 76 extends in the longitudinal direction of the flame hole member 33. Therefore, the premixed gas discharged from the side flame holes 76 is sufficiently slower than the flow velocity of the premixed gas discharged from the flame holes 60. In addition, a sufficient amount of air to completely burn the premixed gas in the side flame hole 76 is released from the gap 140 to the side of the side flame hole 76. Therefore, a stable flame holding is formed in the side flame hole 76 in combination with the low flow rate of the premixed gas. Further, by this flame holding, the base end portion of the primary flame formed in the flame hole 60 is held, and the primary flame is stabilized.

  When primary combustion is performed in the first combustion region 34a of the combustion section 34, a part of the fuel gas remains unburned in the combustion gas generated by the primary combustion. Combustion gas containing unburned fuel gas (hereinafter referred to as unburned residual gas as necessary) is a second gas located downstream of the burner unit 30, that is, on the upper end side (tip side) in the illustrated state. It flows to the combustion region 34b. The unburned residual gas that has flowed into the second combustion region 34b passes through the route P1 of the first gas route P described above, and the openings 97, 98 provided on the front end side of the air flow path member 35, the long slits 92, 93, secondary combustion is formed in the presence of air discharged from the short slits 95, 96 to form a secondary flame, and the unburned fuel gas contained in the unburned residual gas is completely burned. .

  The operation of the hot water supply device 1, the combustion device 10, and the burner unit 30 according to the present embodiment will be described. The hot water supply apparatus 1 burns fuel gas in each burner unit 30 constituting the combustion apparatus 10 based on a usage request from a user, and supplies the heat exchange means 5 with heat exchange with the high-temperature combustion gas generated thereby. Heat the hot and cold water.

  More specifically, the combustion apparatus 10 according to the present embodiment can perform a combustion operation on all or a part of the many burner units 30 arranged in the case member 11. When the combustion device 10 performs the combustion operation, the blower 3 is first activated, and the outside air is supplied to the burner unit 30 that performs the combustion operation. In parallel with this, fuel gas is supplied from the gas nozzle 8 to the burner unit 30 that performs the combustion operation. The air and fuel gas supplied to each burner unit 30 are distributed throughout the burner unit 30 in the same manner as described above. The fuel gas supplied to each burner unit 30 is premixed with air to become a premixed gas, and enters the combustion unit 34 from the flame hole 60 of the flame hole member 33 or the side flame holes 76 provided on both sides thereof. Released. In addition, the air supplied to each burner unit 30 includes a gap 140 provided beside the side flame hole 76, openings 97, 98, 112, 113 provided in the air flow path member 35, and long slits 92, 93. The gas is discharged from the short slits 95 and 96 to the combustion unit 34 side.

  As described above, when the premixed gas or air is distributed to each burner unit 30 to be used for combustion, the ignition device 12 (see FIGS. 1 and 2) provided above the burner unit 30 in the combustion device 10 performs the preheating. The mixed gas is ignited. As shown in FIG. 2, the ignition device 12 is positioned above the combustion section 34 included in one of the burner units 30 arranged side by side (the burner unit 30 a in FIG. 2). Therefore, when the ignition operation by the ignition device 12 is performed, first, the premixed gas starts to burn in the combustion section 34 of the burner unit 30a.

  When the premixed gas starts to burn in the burner unit 30a, as shown in FIG. 4 and the like, a primary flame is formed in the first combustion region 34a of the combustion section 34 of the burner unit 30a, and the side flames provided on both sides thereof. A small flame (flame holding) is formed in the hole 76. Further, in the second combustion region 34b provided on the downstream side in the flow direction of the premixed gas discharged from the flame hole 60 with respect to the first combustion region 34a, that is, on the tip side of the burner unit 30a, the first combustion region 34a In combustion (primary combustion), the fuel gas remaining in an unburned state burns (secondary combustion), and a secondary flame is formed. When the primary flame, the flame holding, and the secondary flame are formed in the burner unit 30a in this way, a fire transfer occurs from the burner unit 30a toward the burner unit 30 adjacent thereto.

  Here, the burner unit 30 employed in the hot water supply apparatus 1 and the combustion apparatus 10 of the present embodiment is provided at the front end side of each air flow path member 35, and has a notch 89 for fire transfer at a substantially central part in the longitudinal direction. And the combustion parts 34 of the burner units 30 and 30 adjacent to each other, more specifically, the second combustion regions 34b communicate with each other. Therefore, when a secondary flame is formed in the burner unit 30, the burner unit 30 adjacent to the burner unit 30 via the flame transfer cutout portions 89 and 89 of the air flow path members 35 and 35 constituting the burner unit 30, The fires are transferred smoothly and smoothly toward the 30 combustion parts 34, 34, and flames (primary flame, secondary flame, flame holding) are formed in all the combustion parts 34 of the burner unit 30 used for combustion.

  Further, as shown in FIG. 12 and the like, the air flow path member 35 is provided with openings 97 and 98, long slits 92 and 93, and short slits 95 and 96 in order to supply air to the combustion section 34 on the tip side. Although they are configured, they are provided at positions outside the extension of the region where the fire transfer notch 89 is provided. Further, in the air flow path member 35, as shown in FIG. 17, the gap s (see FIG. 17) formed in the bent portions of the engagement pieces 85 and 86 existing at the position adjacent to the notch 89 for fire transfer. Most of the protrusions 83a and 84a are closed, and almost no air flows into the notch 89 for fire transfer from the gap s. Therefore, in the combustion apparatus 10 of the present embodiment, there is a low possibility that the fire transfer in the fire transfer notch 89 is hindered by the air released from the openings 97, 98 and the like.

  Here, as described above, the combustion apparatus 10 includes a large number of burner units 30 in the case member 11, and the combustion operation can be performed in all or part of the combustion operation. It is. In the hot water supply apparatus 1 of the present embodiment, the combustion amount required for the combustion apparatus 10 based on the amount of thermal energy required to heat the hot water with the heat exchange means 5 according to the amount of hot water to be supplied and the set temperature (hereinafter referred to as the amount of combustion) (Referred to as a required combustion amount if necessary), and the number of burner units 30 that perform the combustion operation in the combustion apparatus 10 is changed in accordance with the required combustion amount.

  More specifically, the combustion apparatus 10 has a large number of burner units 30 arranged side by side in the case member 11 as described above. However, all the burner units 30 are operated by combustion depending on the required combustion amount. Only a part of the burner units 30 may be burned. More specifically, when the required combustion amount for the combustion device 10 is equal to or greater than a predetermined amount (hereinafter referred to as a large combustion amount as necessary), all the burner units 30 constituting the combustion device 10 are operated for combustion. .

  On the other hand, when the required combustion amount for the combustion apparatus 10 is less than a predetermined amount (hereinafter referred to as a small combustion amount as necessary), some of the many burner units 30 disposed in the case member 11 are burned. Operates but the remainder does not burn. In the present embodiment, of the burner unit 30 constituting the combustion apparatus 10, the case member 11 is separated from an air flow path member 35 (hereinafter referred to as an air flow path member 35 a as necessary) provided at a predetermined position. The burner unit 30 disposed on one side performs the combustion operation, but the burner unit 30 disposed on the other side does not perform the combustion operation.

  More specifically, when the air flow path member 35 arranged on the left side with respect to the third intermediate member 36 from the right in the state shown in FIG. 3 corresponds to the air flow path member 35a at the boundary position described above. Each burner unit 30 provided on the left side of the air flow path member 35a performs the combustion operation regardless of the required combustion amount, but the burner unit 30 existing on the right side of the air flow path member 35a is required. The combustion operation is not performed when the combustion amount is a small combustion amount. Therefore, in the state shown in FIG. 3, when the required combustion amount is a small combustion amount, the left surface of the air flow path member 35 a, that is, the second partition member structure 81 becomes high temperature, but the first partition member structure 80. Does not reach a high temperature, and the temperature difference between the first and second partition members 80 and 81 increases.

  That is, in the state shown in FIG. 2, the air flow path member 35a is formed with a flame in the combustion part 34 facing the left side (second partition wall structure 81 side), but on the right side (first partition wall structure 80 side). A flame is not formed in the combustion part 34 facing the surface. Therefore, in the air flow path member 35a, the second partition wall structure 81 is heated by the flame and becomes high temperature, while the first partition wall structure 80 is not heated. Therefore, when the required combustion amount is a small combustion amount, a large temperature difference is formed between the first and second partition wall structures 80 and 81, and the second partition wall structure 81 side expands more than the first partition wall structure 80. Or stretch. Accordingly, assuming that the first and second partition members 80 and 81 constituting the air flow path member 35a are firmly fixed by welding or the like, a large thermal stress acts on the fixed portion or the like. There is a possibility that problems such as cracks occur in the fixed portion and the first and second partition members 80 and 81.

  However, in the burner unit 30 of the present embodiment, considering that the above-described thermal stress acts when the required combustion amount for the combustion apparatus 10 is a small combustion amount, Rather than fixing 81 by welding or the like, the first and second partition members 80 and 81 are bent and engaged with each other at the distal end portion and both longitudinal end portions of the air flow path member 35 to be integrated by caulking. As a result, the occurrence of defects due to thermal stress as described above is prevented.

  More specifically, the engagement pieces 85 and 86 provided at the upper end portions 80a and 81a of the first and second partition members 80 and 81 are bent so that the first and second engagement portions 90a and 90b become the air flow path member 35. The engaging portions 90 alternately arranged in the longitudinal direction are formed, the first and second partition members 80, 81 are engaged on the upper end portions 80a, 81a side, and the engaging portions 90 are caulked and fixed. Yes. Further, by bending the flanges 81c and 81d at both ends in the longitudinal direction of the second partition wall structure 81 toward the first partition wall structure 80, the first and second partition wall structures 80 and 81 are engaged at both ends in the longitudinal direction. In addition, the engaging portion is caulked and fixed. For this reason, the first and second partition members 80 and 81 are integrated in the engaging portion 90 and the like, but the restraining force (fixing force) acting between the first and second partition members 80 and 81 in the part. Is smaller than when fixed by welding or the like. Therefore, even if only one of the first and second partition members 80 and 81 becomes high temperature and slightly expands or deforms compared to the other, the expansion or deformation is relaxed or offset by the engaging portion 90 or the like. Unreasonable stress does not act on the first and second partition members 80 and 81.

  As described above, the combustion apparatus 10 of the present embodiment is provided with the fire transfer notch 89 at the front end of the air flow path member 35 constituting the burner unit 30, and is present at a position adjacent to the fire transfer notch 89. Although most of the gap s (see FIG. 17) formed in the bent portions of the engaging pieces 85, 86 to be closed is closed by the protruding portions 83a, 84a, the present invention is not limited to this. Alternatively, the protrusions 83 and 84 may not be provided.

  Although the combustion apparatus 10 of the present embodiment is configured to assist the fire transfer between the adjacent combustion sections 34 and 34 by providing the fire transfer notch 89, the present invention is not limited to this. The fire transfer notch 89 may be omitted. Further, as in the combustion apparatus 10 of the present embodiment, it is assumed that not all the air transfer notches 89 are provided in all the air flow path members 35 arranged in the case member 11, for example, the fire transfer is likely to be delayed. For example, the fire transfer notch 89 may be provided only in a part of the air flow path members 35, for example, the fire transfer notch 89 may be provided only in the air flow path member 35 existing in the portion.

  Further, as described above, even in the case where the air passage member 35 is not provided with the fire transfer notch portion 89, the region corresponding to the extension of the portion where the fire transfer notch portion 89 is provided in the above embodiment. As in the case where the openings 97 and 98, the long slits 92 and 93, and the short slits 95 and 96 are not provided, the openings 97 and 98 may not be provided in a predetermined region. In such a configuration, the airflow in the part where the openings 97, 98, etc. are not provided becomes gentler than in other parts, so that the fire transfer between the adjacent combustion parts 34, 34 proceeds smoothly in the part.

  The air flow path member 35 employed in the above-described burner unit 30 has an upper end than the valley fold portion L1 of the first and second partition wall structures 80 and 81 as shown in FIGS. The portions 80a and 81a are in surface contact with each other and have a portion that rises vertically upward (front end side) (hereinafter referred to as a rising portion if necessary). Was bent, and the engaging portion 90 was formed. However, if there is a rising portion as described above at the front end portion of the air flow path member 35, this may hinder the burning. Therefore, when there is such a concern, it is possible to adopt a configuration in which there is no portion corresponding to the above-described rising portion, such as the air flow path member 151 of the burner unit 150 (combustion device) shown in FIG.

  More specifically, the burner unit 150 shown in FIG. 21 is largely the same as the burner unit 30 described above, but only the configuration of the portion on the tip side of the air flow path member 151 is different. That is, the air flow path member 151 is formed by engaging and integrating the first and second partition wall structural bodies 160 and 170 as shown in FIGS. 22 (a) and 22 (b). The leading end portion does not have a rising portion like the air flow path member 35 described above.

  As shown in FIGS. 22A and 22B, the first and second partition wall constituting bodies 160 and 170 are mostly the same as the first and second partition wall constituting bodies 80 and 81 constituting the burner unit 30 described above. Although it is configured, the configuration of the upper end portions 160a, 170a side of the portion where the lateral groove 100 is provided is different from that of the first and second partition wall structures 80, 81. More specifically, in the first and second partition members 80 and 81, the engagement pieces 85 and 86, the long slits 92 and 93, the short slits 95 and 96, the opening 97, 98 etc. are provided. However, in the first and second partition members 160 and 170, a large number of engagement pieces 161 and 171 and slits 162 and 172 are provided in place of them, and three openings 163 to 165 are provided in the engagement pieces 161 and 171, respectively. And openings 173 to 175 are provided.

  As shown in FIGS. 22A and 22B, the openings 163 to 165 and the openings 173 to 175 have a first central portion in the width direction (left and right direction in FIG. 22) of the engagement pieces 161 and 171, respectively. , 2 partition walls 160, 170 are arranged in a row at a predetermined interval in the height direction (vertical direction in FIG. 22). That is, the openings 164 and 174 are provided at substantially central portions of the engaging pieces 161 and 171, respectively. The openings 163 and 173 and the openings 165 and 175 pass through the centers of the openings 164 and 174, respectively, and are symmetrical with respect to an imaginary line T1 extending in the longitudinal direction of the first and second partition members 160 and 170. It is in.

  The air flow path member 150 is formed by engaging and integrating the first and second partition structure members 160 and 170 described above. That is, when the air flow path member 150 is assembled, the first and second partition wall structures 160 and 170 are opposed to each other with a predetermined interval. Then, the flange portions 170c and 170d provided at both ends in the longitudinal direction of the partition wall structure 170 are bent, and by this, the flanges 160c and 160d at both ends in the longitudinal direction of the partition wall structure 160 are folded, thereby forming the partition wall structure members 160 and 170. Is engaged at both ends in the longitudinal direction. In addition, the first and second partition members 160 and 170 have the engagement pieces 161 and 171 provided at the upper ends 160a and 170a bent in a semicircular shape as shown in FIGS. Engaging portions 180 engaged with each other are formed.

  The engagement portion 180 includes an air flow path member having a first engagement portion 181 having a cross-sectional shape as shown in FIG. 21D and a second engagement portion 182 having a cross-sectional shape as shown in FIG. 150 is arranged alternately in the longitudinal direction. The first and second engaging portions 181 and 182 are obtained by integrally bending the engaging piece 161 and the engaging piece 171 into a semicircular shape. As shown in FIG. 21 (d), the first engaging portion 181 is engaged so that the engaging piece 161 covers the engaging piece 171, and the second engaging portion 182 is shown in FIG. As shown in (e), the engagement piece 171 is engaged so as to cover the engagement piece 161.

  In the first and second engaging portions 181 and 182, the openings 163 to 165 provided in the engaging pieces 161 and 171 communicate with the openings 173 to 175. Specifically, the openings 163 and 175, the openings 164 and 174, and the openings 165 and 173 communicate with each other. The portions where the openings 163 and 175 communicate and the portions where the openings 165 and 173 communicate are the air in the burner unit 150 in the same manner as the openings 97 and 98 provided on the front end side of the air flow path member 35 described in the above embodiment. It functions as an opening for supplying air to the second combustion region 34b of the combustion section 34 formed between the flow path members 151 and 151. Further, the portion where the openings 164 and 174 communicate with each other is opened upward in the state shown in FIG. 21, and the air flowing in the air flow path member 151 is released upward through the opened portion. Can do.

  When the engaging portion 180 is formed as described above and the first and second partition wall constituting bodies 160 and 170 are integrated, the slits 162 and 172 are provided between the first engaging portion 181 and the second engaging portion 182. Will be in communication. The slits 162 and 172 correspond to the long slits 92 and 93 and the short slits 95 and 96 of the air flow path member 35 described in the above embodiment. Similarly to these, the slits 162 and 172 are formed in the second combustion region 34b of the combustion unit 34. It functions as an opening for supplying air.

  As described above, in the burner unit 150 shown in FIG. 21, the upper end portion of each air flow path member 151 does not have a rising portion as at the top of the air flow path member 35. Therefore, in the combustion apparatus 10 constituting the hot water supply apparatus 1, if the burner unit 150 is arranged in the case member 11 instead of the burner unit 30 described above, the combustion portions 34, of the adjacent burner units 150, 150 are arranged. The fire transfer between 34 proceeds smoothly.

  In addition, since the burner unit 150 shown in FIG. 21 does not correspond to the rising portion provided in the air flow path member 35, the height of the air flow path member 151 is correspondingly low. Therefore, if it is set as the above-mentioned structure, the burner unit 150 and the combustion apparatus 10 which employ | adopted this can be made further compact.

  Although the description has been omitted in the above description, the openings 163 to 165 and the openings 173 to 175 provided in the engagement pieces 161 and 171 may have the same opening diameter or different configurations depending on the part. Good. However, the dimensional tolerance of the air flow path member 151, the positional deviation when the first and second partition wall structural bodies 160 and 170 are integrated, the expansion and deformation accompanying the temperature change of the first and second partition wall structural bodies 160 and 170, etc. 21 (d) and (e), the second engagement portion 182 and the one provided on the engagement pieces 161 and 171 constituting the first engagement portion 181 are configured. It is desirable to adjust the size of the opening diameters of the openings 163 to 165 and the openings 173 to 175 with those provided on the engagement pieces 161 and 171.

  More specifically, the opening diameters of the openings 163 to 165 and the openings 173 to 175 provided in the engaging pieces 161 and 171 constituting the first engaging portion 181 are located outside the engaging pieces 161 and 171. It is desirable that the opening diameter of the thing is smaller than the opening diameter of the thing located inside. More specifically, as shown in FIG. 21 (d), the openings 163 to 165 provided in the engagement piece 161 constituting the first engagement portion 181 are the openings of the openings 173 to 175 provided in the engagement piece 171. Desirably smaller than the aperture. Similarly, as shown in FIG. 21 (e), the openings 173 to 175 provided in the engagement piece 171 constituting the second engagement portion 182 are the opening diameters of the openings 163 to 165 provided in the engagement piece 161. It is desirable to be smaller.

  The engaging pieces 161 and 171 provided in the first and second partition wall structural bodies 160 and 170 are substantially rectangular in plan view, but the present invention is not limited to this. For example, as shown in FIG. 23A, instead of the engagement pieces 161 and 171, engagement pieces 185 and 186 having a substantially “L” shape in plan view may be provided and bent as shown. In the case of such a configuration, as shown in FIG. 23 (a), between the first and second partition structure members 160 and 170, the portions extending so as to intersect with each other (intersection portions 185a and 186a), and the first If the gap between the portions (parallel portions 185b, 186b) extending substantially parallel to the two partition wall structures 160, 170 is formed, the gap 187 formed thereby is effective as an air discharge opening. Can be used.

  Further, as shown in FIG. 23B, either one of the engagement pieces 161 and 171 provided in the first and second partition members 160 and 170 (the engagement piece 161 in FIG. 23B). It is good also as a structure which provided the slit 190 in the substantially center part of the width direction. With this configuration, the opening provided on the other side of the engagement pieces 161 and 171 (the engagement piece 171 in FIG. 23B) is reliably exposed.

  As with the burner unit 30 described above, the above-described burner unit 150 also includes an air flow path member 151 composed of first and second partition members 160 and 170, which are engaged with each other at their ends. The joint portion 180 is formed and integrated. Therefore, the burner unit 150 is also arranged between the combustion unit 34 that performs the combustion operation and the combustion unit 34 that does not perform the combustion operation in the same manner as the above-described burner unit 30 (burner unit 30a). Even if only one of the bodies 160 and 170 expands due to a temperature rise, this is relieved at the engaging portion 180. For this reason, even if the burner unit 150 is arranged in a situation where a temperature difference occurs between the first partition wall structure 160 and the second partition wall structure 170, a problem such as damage to the air flow path member 151 occurs. Hateful.

  Further, as described above, in the burner units 30 and 150, the air flow path members 35 and 151 are substantially the same as the first and second partition structure members 80 and 81 or the first and second partition structure members 160 and 170. It has a configuration and is engaged with each other on the tip side. Therefore, even if the burner units 30 and 150 are both accompanied by a combustion operation and both the first and second partition wall structural bodies 80 and 81 and the first and second partition wall structural bodies 160 and 170 are heated, the extension and expansion of the both. Therefore, it is unlikely that either one of the first and second partition members is extremely deformed or a large thermal stress acts on one. Therefore, even if the burner units 30 and 150 are used under the condition that both the first and second partition wall structural bodies 80 and 81 and the first and second partition wall structural bodies 160 and 170 are heated, Inconveniences such as cracking in 151 are unlikely to occur.

  In the burner units 30 and 150 described above, the first engaging portions 90a and 181 and the second engaging portions 90b and 182 are alternately arranged in the longitudinal direction of the air flow path members 35 and 151. However, the present invention is not limited to this, and the order of the first engaging portions 90a and 181 and the second engaging portions 90b and 182 may be appropriately changed.

  Moreover, in the said embodiment, in order to comprise the engaging parts 90 and 180, the engagement piece 85,86 and engagement to the 1st, 2 partition structure 80,81 and the 1st, 2 partition structure 160,170. Although a configuration in which a large number of pieces 161 and 162 are provided is illustrated, the present invention is not limited to this. For example, either one of the first and second partition structure members 80 and 81 or the first and second partition structure members The entire upper end of either one of 160 and 170 may be folded and the entire other upper end of each other may be folded. With this configuration, it is possible to further simplify the manufacture of the burner units 30 and 150 as compared with the case where a large number of the engagement pieces 85 and 86 and the engagement pieces 161 and 162 are provided.

  In the burner units 30 and 150 described above, the engaging portions 90 and 180 are caulked. For this reason, the burner units 30 and 150 firmly integrate the first and second partition wall structural bodies 80 and 81 and the first and second partition wall structural bodies 160 and 170 while ensuring freedom of expansion and deformation. Can do. In addition, in the said embodiment, although the structure which crimped the engaging parts 90 and 180 was illustrated, it is good also as a structure which does not crimp the said site | part.

  In the burner unit 150 described above, since there is no structure that inhibits the fire transfer between the combustion portions 34 and 34 adjacent to the tip portion of the air flow path member 151, it is assumed that the fire transfer proceeds relatively smoothly. Is done. However, the air flow path member 151 has a structure in which a large number of openings 163 to 165 and openings 173 to 175 communicate with each other to eliminate or close a part of the air discharge hole. It is also possible to further improve the transfer performance. In other words, any one of a large number of air discharge holes on the front end side of the air flow path member 151 is provided with a portion (opening interval expanding portion) that is wider than the adjacent air discharge hole than the other. It is good also as a structure. With this configuration, the air flow is reduced at the opening interval enlarged portion, and the fire transfer between the adjacent combustion portions 34 and 34 in the portion or the vicinity thereof proceeds more smoothly.

  The first and second partition structure members 80, 81, 160, and 170 exemplified in the above embodiment are each configured by forming irregularities or bending a single steel sheet, but the present invention is not limited thereto. For example, it is possible to combine a plurality of members provided for each part, or to superimpose two or more steel plates.

It is a conceptual diagram which shows typically the internal structure of the hot water supply apparatus concerning one Embodiment of this invention. It is a front view which shows the combustion apparatus concerning one Embodiment of this invention. It is a fracture perspective view showing the structure of the burner unit concerning one embodiment of the present invention. It is sectional drawing of the burner unit shown in FIG. It is a disassembled perspective view of the burner unit shown in FIG. It is sectional drawing which shows the decomposition | disassembly state of the burner unit shown in FIG. It is a perspective view which shows a pre-mixing member. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a disassembled perspective view which shows a flame hole member. It is sectional drawing which shows a flame hole member. It is a perspective view which shows an air flow path member. (A) is sectional drawing of an air flow path member, (b) is the A section enlarged view of (a). (A) is a front view which shows the 1st partition structural member which comprises the air flow path member of FIG. 12, (b) is a side view of (a), (c) is the A section enlarged view of (a). is there. (A) is a front view which shows the 2nd partition structural member which comprises the air flow path member of FIG. 12, (b) is a side view of (a), (c) is the A section enlarged view of (a). is there. It is sectional drawing which shows the state before the assembly of the air flow path member shown in FIG. (A) is the A section enlarged view of FIG. 12, (b) is a front view of the part shown to (a), (c) is a B direction arrow directional view of (a). It is explanatory drawing of the airflow route P formed in the burner unit shown in FIG. It is explanatory drawing of the airflow route Q formed in the burner unit shown in FIG. It is explanatory drawing of the airflow route R formed in the burner unit shown in FIG. (A) is a fracture | rupture perspective view which shows the structure of the burner unit concerning another embodiment of this invention, (b) is a X direction arrow directional view of (a), (c) is a Y direction arrow of (a). FIG. 4D is a cross-sectional view taken along line AA in FIG. 4C, and FIG. 4E is a cross-sectional view taken along line BB in FIG. (A), (b) is a front view which shows the 1st, 2nd partition structure which comprises the air flow path member respectively employ | adopted in the burner unit shown in FIG. It is a front view which shows the engagement state of the engagement piece of what concerns on the modification of the 1st, 2nd partition structure shown in FIG. (A) is sectional drawing which shows the combustion apparatus of a prior art, (b) is a fracture | rupture perspective view which shows the burner unit which comprises the combustion apparatus of (a).

Explanation of symbols

1 Hot water supply device 10 Combustion device 30 Burner unit (combustion device)
32 Premixing member 33 Flame hole member 34 Combustion part 34a First combustion region 34b Second combustion region 35 Air flow path member (partition wall member)
36 Intermediate member 80 First partition member structure 81 Second partition member structure 83, 84 Notch 83 a, 84 a Protruding part 85, 86 Engagement piece 87, 88 Engagement notch 89 Fire transfer notch part 90 Engagement part 90 a First engagement Joint portion 90b Second engagement portion 92, 93 Long slit (opening)
95,96 Short slit (opening)
97, 98, 112, 113, 119, 120 Opening 150 Burner unit (combustion device)
151 Air channel member 160 First partition member 161, 171 Engagement pieces 163-165, 173-175 Opening 170 Second partition member 180, 185, 186 Engagement member 187 Gap

Claims (13)

A premixing member capable of premixing fuel gas and air to form a premixed gas;
A flame hole member disposed downstream of the premixing member in the flow direction of the premixed gas;
A partition wall member disposed on the side of the flame hole member and extending toward the downstream side in the flow direction of the premixed gas supplied from the flame hole member;
A combustion section surrounded by the partition member and the flame hole member and capable of burning the premixed gas supplied from the flame hole member;
The combustion section has a first combustion region on the upstream side in the flow direction of the premixed gas supplied from the flame hole member, and is on the downstream side in the flow direction of the premixed gas with respect to the first combustion region, and the partition wall Having a second combustion region on the tip side of the member;
The premixed gas supplied to the combustion section is burned in the first combustion region under an amount of air smaller than the theoretical air amount, and the premixed gas is completely burned in the combustion in the first combustion region. It is possible to supply the second combustion region with more air than the shortage of air and burn it,
The partition member has a first partition configuration body and a second partition configuration body, and the first and second partition configuration bodies engage with each other at an end portion to form an engagement portion, and are integrated. Combustion device characterized by that. In the partition member, the first partition structure and the second partition structure are arranged at a predetermined interval, and a flow path portion is provided between them.
The said flow path part exists in the side of a combustion part, The air supplied to the said flow path part can be supplied to a 1st combustion area and / or a 2nd combustion area, It is characterized by the above-mentioned. Item 4. The combustion apparatus according to Item 1.   The engaging portion engages the first partition wall configuration body and the second partition wall configuration body by folding the other end portion into either one of the first partition wall configuration body and the second partition wall configuration body. The combustion apparatus according to claim 1, wherein the combustion apparatus is a thing. A bent piece is provided at one or both ends of the first partition wall structure and the second partition wall structure,
The engaging portion folds the other end of the first partition wall structure and the second partition wall structure from the first partition wall by folding pieces provided on one side of the first partition wall structure and the second partition wall structure. The combustion apparatus according to claim 1, wherein the combustion apparatus is formed by engaging a structural body and a second partition structural body. Bending pieces are provided at the ends of the first partition wall structure and the second partition wall structure,
A first engagement portion formed by folding an end portion of the second partition wall structure with a bent piece provided on the first partition wall structure, and a bent portion provided on the second partition wall structure 3. The combustion apparatus according to claim 1, wherein the combustion apparatus according to claim 1, wherein the combustion apparatus is provided so that second engagement portions formed by folding the end portions of the first partition wall structure into pieces are alternately arranged.   The combustion apparatus according to any one of claims 1 to 5, wherein the first partition wall structure and the second partition wall structure are caulked at the engaging portion. A plurality of intermediate members configured by combining the premixing member and the flame hole member are arranged,
One combustion part provided on the downstream side in the flow direction of the premixed gas with respect to one intermediate member, and another combustion part provided on the downstream side in the flow direction of the premixed gas with respect to the intermediate member adjacent thereto A partition member is interposed between
A notch is provided on the tip side of the partition member,
The combustion apparatus according to any one of claims 1 to 6, wherein the second combustion regions of the combustion portions adjacent to each other via the partition wall member communicate with each other through the notch portion.   The combustion apparatus according to claim 7, wherein the notch is provided at a center in the longitudinal direction of the partition wall member or in the vicinity thereof. An opening for supplying air to the second combustion region is provided on the distal end side of the partition member,
The combustion apparatus according to claim 7 or 8, wherein the opening is provided at a position off the notch. A plurality of openings for supplying air to the second combustion region are arranged in a row on the distal end side of the partition member,
The combustion apparatus according to any one of claims 1 to 9, wherein there is an opening interval widening portion in which an interval between adjacent openings is wider than the others. A plurality of openings for supplying air to the second combustion region are arranged in a row on the distal end side of the partition member,
There is an opening interval enlarged portion where the interval between adjacent openings is wider than the others,
The combustion apparatus according to any one of claims 7 to 9, wherein the opening interval widening portion is provided at a position corresponding to the notch portion. A bent piece is provided at one or both ends of the first partition wall structure and the second partition wall structure,
In a position adjacent to the notch portion, the bent piece provided at the front end portion on one side of the first partition wall constituting body and the second partition wall constituting body is formed by being folded so as to cover the front end portion on the other side. Having an engaging portion,
A protrusion is provided at the tip of the other side,
The gap between the inner side of the fold portion of the bent piece on the one side and the tip end portion on the other side is closed or reduced by the projecting portion. The combustion apparatus as described. Combustion means for combusting fuel gas, and heat exchange means capable of heating the liquid using thermal energy generated by the combustion operation in the combustion means,
A hot water supply apparatus, wherein the combustion means is provided with the combustion apparatus according to any one of claims 1 to 12.

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