JP3288603B2 - Combustion device and hot water supply device provided with the combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of burner units having an elongated flame surface at one end side thereof, which are arranged side by side in the width direction of the flame surface so as to form a fuel gas and combustion air. A plurality of flame ports for ejecting and burning the air-fuel mixture and a plurality of non-flame ports for not ejecting the air-fuel mixture are alternately provided on the flame surface along the longitudinal direction thereof, between the burner units. The present invention relates to a combustion apparatus in which a discharge passage having an elongated discharge port for discharging combustion air or a lean air-fuel mixture is formed.

[0002]

2. Description of the Related Art A combustion apparatus having such a structure is capable of stably burning an air-fuel mixture ejected from a flame orifice, and combusting a combustion air or a lean air-fuel mixture discharged from an ejection port with respect to the combustion flame. Since the flame is supplied, the flame generated in the flame port is easily lifted by the combustion air or the light air-fuel mixture from the discharge port, and may blow out. Therefore, conventionally, as disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 3-5029, the flame opening face is formed in an M-shaped cross section in which the center in the width direction is recessed toward the upper side in the air-fuel mixture ejection direction. A slit-shaped flame opening is formed over the entire width of the flame, and shielding plates are arranged along both left and right sides of the flame opening surface, and the air for combustion into the flame generated in the flame opening by the shielding plate is provided. There is known a configuration in which the inflow is suppressed to prevent the lift of the flame.

[0003]

However, in the above-mentioned conventional structure, since the slit-shaped flame opening portion is open over the entire width of the M-shaped flame surface, the flame is inevitably formed on the flame surface. It is produced in a state of being spread laterally, and therefore has a disadvantage that it is easily affected by combustion air. In order to solve such a drawback, shielding plates are arranged on both sides of the flame surface, but the shielding plate includes not only the flame portion but also the non-flame portion, Is arranged over the entire length of the flame, there is a possibility that the combustion air may not be sufficiently supplied to the flame generated at the flame outlet.

That is, since the flame spreads laterally, to effectively suppress the influence of the combustion air on the flame, the shielding plate is provided so as to protrude considerably below the flame port in the direction in which the mixture is jetted. There is a need. However, if the amount of protrusion of the shielding plate toward the lower side in the direction in which the air-fuel mixture is blown out is too large, the shielding plate shields the side of the non-flame opening to the side of the flame-free opening, so that combustion air is not generated by the flame generated in the opening. Will not be supplied enough. Conversely, if the amount of protrusion of the shielding plate is reduced to sufficiently supply the combustion air to the flame, the influence of the combustion air on the flame increases, and a lift phenomenon of the flame may occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. It is an object of the present invention to effectively suppress the lift phenomenon of a flame generated at a flame opening while preventing the flame from being lifted. It is an object of the present invention to provide a combustion apparatus capable of performing stable combustion by sufficiently supplying combustion air or a lean air-fuel mixture.

[0006]

In order to achieve this object, according to the first aspect of the present invention, the burner unit is recessed toward the center of the burner unit in the width direction toward the upstream side in the air-fuel mixture ejection direction. The flame is formed on the concave surface and the flame port is provided at the center in the width direction of the flame surface to be recessed. The air-fuel mixture ejected from the flame port by the action of the concave flame surface does not spread and tends to approach the center of the flame port, so that a flame is generated at the center of the flame port. . The flame generated in the flame opening portion in this way is less likely to be affected by the combustion air or the lean mixture from the discharge port near the center of the flame opening portion,
In addition, while allowing combustion air or light mixture from the discharge port adjacent to the non-flame port to flow into the flame port, combustion air or light mixture from the discharge port adjacent to the flame port is allowed. Since a shielding member for suppressing the inflow of the air-fuel mixture is provided, for the flame generated in the flame opening, the combustion air or the light air-fuel mixture is supplied from the non-flame opening side while the flame opening is provided. The effect of combustion air from the discharge port adjacent to the nozzle can be minimized, and stable combustion can be performed while suppressing the flame lift phenomenon. The shielding member is formed of a plate-shaped shielding plate.
Since the shielding member is relatively
It can be easily made, and the shielding plate is
Position on the lateral side of the part, the tip of which is
Also protrudes to the lower side of the air-fuel mixture ejection direction
Because it is provided along the longitudinal direction,
The inflow of combustion air and light mixture is more reliably suppressed,
More stable combustion becomes possible.

According to the second aspect of the present invention, the shielding
By providing a plate adjacent to only the lateral side of the flame outlet,
The combustion air and lean air-fuel mixture to the flame
In fact, more stable combustion is possible, and moreover,
The end of the shielding plate is on the lower side in the direction of air-fuel mixture ejection than the surface of the flame
To the side of the flame outlet only
Supply of combustion air from the non-flame port side
Can be performed as desired, and more stable combustion is possible.
You.

[0008]

According to the third aspect of the present invention, since the shielding plate is fixed to the lateral side surface of the burner unit, the lateral side of each flame port provided on the flame surface of the burner unit. Therefore, it is possible to reliably adjoin the fuel cell and to suppress the inflow of combustion air and the like by each shielding plate.

According to the fourth aspect of the present invention, the plurality of flame ports provided on the face of the flame port are rich flame ports for injecting and burning a rich mixture, and the discharge port is a light mixture. And a discharge chamber for discharging and burning, and the discharge flow path is a so-called light-and-dark combustion device, which is a light-mixing chamber for light-air mixture. The generation of objects can be reduced.

According to the fifth aspect of the present invention, the cover plate is provided along the lateral side surface of the burner unit to prevent the lean mixture in the lean mixing chamber from flowing to the longitudinal end of the burner unit. The cover plate can prevent the lean mixture from incompletely burning due to the outflow of the lean mixture to the end of the burner unit, and the cover plate is integrally provided with a shielding plate. Thus, the structure can be simplified by sharing the components.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a combustion apparatus according to the present invention will be described with reference to the drawings. This combustion device is used, for example, for a hot water supply device. As shown in FIGS. 1 and 2, the combustion device includes a burner case 1 and a box-shaped frame 2 provided inside the burner case 1, and a plurality of flat flat members. The burner units 3 made of sheet metal are housed side by side at predetermined intervals in the box-shaped frame 2. A fan 4 for supplying combustion air is provided below the burner case 1, and a discharge port thereof communicates with an air chamber 5 formed between the bottom of the burner case 1 and the bottom of the box-shaped frame 2. ing.

The burner unit 3 is for injecting and burning a rich mixture having a low primary air mixing ratio.
As shown in FIG. 3, a plurality of flame openings 7 for ejecting a rich mixture and a plurality of non-flame openings 8 which do not eject a rich mixture are formed on an elongated flame surface 6 on the upper surface thereof. They are arranged alternately along the longitudinal direction of the mouth surface 6. The burner unit 3 is provided with a rich mixing chamber 9 communicating with each of the flame outlets 7 and a rich inlet 10 for introducing fuel gas and combustion air into the rich mixing chamber 9. Light gas passage 1 for supplying a mixture of fuel gas and combustion air to a light mixing chamber described later
1 and a lean gas inlet 12 for introducing fuel gas and combustion air into the lean gas passage 11, and a large number of ejection holes 13 are formed in the lean gas passage 11.

By arranging the burner units 3 having such a configuration in parallel at intervals in the width direction of the flame outlet face 6, light mixing with a large primary air mixing ratio is provided between adjacent burner units 3. A light mixing chamber 15 is formed as a discharge channel having an elongated discharge port 14 for discharging air, and the light mixing chamber 15 is formed in the light mixing chamber 15 through the ejection hole 13 of the light gas passage 11. And air can be supplied upward from the air chamber 5 through a perforated air conditioning plate 16 forming the bottom wall of the box-shaped frame 2.
The rich inlet 10 and the lean inlet 12 provided in each burner unit 3 are all arranged side by side in the same direction, and distribute and supply the rich fuel gas and the lean fuel gas to the front surface thereof. A gas header 17 is provided, and a concentration gas nozzle 18 attached to the gas header 17 is connected to each concentration introduction port 10.
In addition, the lean gas nozzle 19 faces each of the lean inlets 12, and a part of the combustion air in the air chamber 5 is divided by a predetermined ratio by an ejector action by blowing the fuel gas from each of the gas nozzles 18 and 19. At each inlet 10, 12
It is configured to be introduced.

As shown in the enlarged view of FIG. 5, the burner port surface 6 of each burner unit 3 is formed as a substantially V-shaped recessed surface whose center in the width direction is recessed on the upper side in the air-fuel mixture ejection direction. The flame opening 7 is provided only at the center in the width direction of the concave surface.
The left and right shoulders 20 have a closed structure. As shown in an enlarged manner in FIG. 4, each of the flame outlets 7 has a slit-shaped air-fuel mixture ejection hole 7a elongated in the width direction of the flame-mouth surface 6 and a split slit-shaped air-fuel mixture ejection hole 7b having a closed central portion. At both ends in the longitudinal direction of the flame outlet face 6, a flame outlet 7 is formed by two slit-shaped air-fuel mixture ejection holes 7a and two split slit-shaped air-fuel mixture ejection holes 7b, At the intermediate portion in the longitudinal direction of the flame port surface 6, each flame port section 7 is formed by four slit-shaped mixture jet holes 7a.

On one side surface of each burner unit 3, a cover plate 2 made of sheet metal having substantially the same shape as the side surface of the burner unit 3 is provided.
The cover plate 21 is attached by caulking to the burner unit 3 at both ends in the longitudinal direction of the burner unit 3, and in the attached state, bent portions 22 formed at both ends of the cover plate 21 are burner units. Unit 3
And is configured to prevent the lean mixture in the lean mixing chamber 15 from flowing out to the longitudinal end side of the burner unit 3. Each cover plate 21 is provided with a total of four rectifying plates 23 made of sheet metal, and each cover plate 21 has a plurality of shielding plates 24a as shielding members.
Are provided integrally upward, and when the cover plate 21 is attached to the burner unit 3, the upper end of each rectifying plate 23 has substantially the same height as the shoulder portion 20 of the flame port surface 6. It is configured as follows.

The cover plate 21 further includes a rectifying plate 2.
A single sheet metal shield holding plate 24 is attached separately from the side surfaces of the burner unit 3 and a plurality of shield plates 24b as a shielding member are integrated upward from the shield holding plate 24. And each shielding plate 24
The upper end portion b is configured to slightly project from the shoulder portion 20 of the flame port surface 6 to the lower side in the air-fuel mixture ejection direction. By arranging the burner units 3 to which the cover plates 21 are attached in parallel, as shown in FIGS. 2 and 5, the cover plates 21 come into contact with the lateral side surfaces of the adjacent burner units 3 and the cover plates 21. Are arranged laterally to the respective flame outlets 7 of the adjacent burner unit 3, and the upper end thereof projects slightly above the shoulder 20 of the flame surface 6. Have been.

That is, the flame opening 7 of each burner unit 3
The left side is covered by the shielding plate 24a of the cover plate 21 attached to the burner unit 3 adjacent to the left side, and the right side is covered by the shielding plate 24b of the shielding holding plate 24. Although the inflow of the lean mixture discharged from the discharge port 14 adjacent to the section 8 into each flame port 7 is allowed, the inflow of the lean mixture discharged from the discharge port 14 adjacent to each flame port 7 is permitted. It is configured to be suppressed.

[Another Embodiment] In the above embodiment, the flame opening 7 of the burner unit 3 is used.
A so-called rich-burn combustion apparatus in which a rich mixture is blown out of the burner unit 3 and a light mixture is blown out from a discharge port 14 between the burners 3 and burns, but combustion in which only combustion air is blown out from the discharge port 14 is shown. It can also be implemented by replacing the device. Further, although the example in which the burner port surface 6 of the burner unit 3 is formed as a substantially V-shaped concave surface is shown, various changes such as U-shape or arc shape are possible, and the shielding members 24a,
Also for 24b, the tip is more mixed than the shoulder 20.
When projecting to the lower side in the ejection direction, as shown in FIG.
The tip is inclined toward the center of the discharge port 14 to more reliably
For light mixture or combustion from discharge port 14 adjacent to flame port 7
Inflow of air can also be suppressed.

[0020]

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a combustion device.

FIG. 2 is a longitudinal sectional front view of a main part of the combustion device.

FIG. 3 is a perspective view of a burner unit constituting the combustion device.

FIG. 4 is a plan view of a main part of the combustion device.

FIG. 5 is a longitudinal sectional front view of a main part of the combustion device.

FIG. 6 is a longitudinal sectional front view of a main part showing another embodiment of the combustion device .
Figure

[Explanation of symbols]

 3 Burner Unit 6 Flame Port 7 Flame Port 8 Non-flame Port 14 Discharge Port 15 Discharge Channel 21 Cover Plate 24a, 24b Shielding Member

──────────────────────────────────────────────────続 き Continued on the front page (72) Yoshikatsu Ishikawa 1-152 Oka, Minami-ku, Osaka-shi, Osaka Prefecture Inside Herman Co., Ltd. (72) Aitaka Tanimura 1-1-1, Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka No. 52, Harman Co., Ltd. (72) Inventor Takahito Yokoyama 1-152, Minami-shi, Minato-ku, Osaka-shi, Osaka 1-52 Inventor Hiroshi Kamiya 1-1-52, Oka, Minami-shi, Minato-ku, Osaka, Osaka No. Katsuyuki Higashi, Examiner, Harman Co., Ltd. (56) References JP-A-7-269813 (JP, A) JP-A-8-200628 (JP, A) JP-A-6-331109 (JP, A) JP-A-10-185121 (JP, A) JP-A-10-160113 (JP, A) JP-A-8-303725 (JP, A) JP-A-8-200633 (JP, A) JP-A-61-149614 (JP, A) U) Hikaru 3-5029 ( P, U) (58) investigated the field (Int.Cl. ^7, DB name) F23D 14/02 F23D 14/08 F23C 11/00 329 - 330

Claims (6)

(57) [Claims] 1. A plurality of burner units each having an elongated flame face at one end side thereof are arranged side by side at intervals in the width direction of the flame face, and a mixture of fuel gas and combustion air is blown out. A plurality of flame ports to be burned and a plurality of non-flame ports which do not eject the air-fuel mixture are provided alternately on the flame surface along the longitudinal direction, and combustion air or light air is provided between the burner units. A combustion device having a discharge passage having an elongated discharge port for discharging an air-fuel mixture, wherein the flame port surface is formed on a recessed surface that is recessed toward the air-fuel mixture ejection direction closer to the center in the width direction. The flame port is formed at the center in the width direction of the recessed flame surface, and the combustion air or the lean air-fuel mixture discharged from the discharge port adjacent to the non-flame port to the flame port. Combustion air or light mixture discharged from the discharge port adjacent to the flame port. The provided suppressing shield member the inflow of air in and constitute a shielding member in a plate-shaped shielding plate, before the shielding plates
It is located on the side of the flame port, and its tip is the flame port.
The flame protrudes downward from the surface
A combustion device provided along the longitudinal direction of the mouth surface . 2. The shielding plate is provided only on the side of the flame opening.
The combustion device according to claim 1, which is provided adjacently . 3. The shield plate is mounted on a side surface of a burner unit.
3. The combustion device according to claim 1, wherein the combustion device is fixed . 4. A plurality of flame ports provided on said flame surface.
A rich flame outlet for blowing out and burning a rich air-fuel mixture,
The discharge port is a light flame outlet for discharging and burning a light mixture.
Thus, the discharge flow path is a light mixing chamber for a light mixture.
Item 4. The combustion device according to any one of Items 1 to 3 . 5. A front along a lateral side of said burner unit.
The light mixture in the mixing chamber is in the longitudinal direction of the burner unit.
Install a cover plate to prevent leakage to the end
5. The method according to claim 4, wherein the shielding plate is provided integrally with the cover plate.
A combustion device as described . 6. The fuel according to claim 1, wherein
Hot water supply device with baking device.