JP2006105468A - Hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply device whose size can be less increased as a whole, for actualizing proper treatment of drain generated with heat recovery while improving the rate of heat recovery from combustion gas. <P>SOLUTION: The hot water supply device A1 comprises a combustion gas flow path 8 through which combustion gas generated by a combustor 1 moves downward and then U-turns at the bottom and moves upward, and a heat exchanger HT located in a lower region of the combustor 1. The heat exchanger HT consists of a primary heat exchanging part 2A for recovering sensible heat from the combustion gas and a secondary heat exchanging part 2B located under the primary heat exchanging part 2A for recovering latent heat. At the bottom of the combustion gas flow path 8, a bottom plate portion 34 is provided which is inclined for receiving drain dropping from the secondary heat exchanging part 2B after generated with latent heat recovery and for gathering it at a fixed place. Right under the bottom plate portion 34, a neutralizing treatment means 4B is provided which receives the drain from the bottom plate portion 34 for neutralizing treatment. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water supply apparatus of a type that generates and supplies hot water by performing heat recovery from a combustion gas generated by a combustor using a heat exchanger, and more specifically, the combustor burns fuel downward. The present invention relates to a hot water supply apparatus that is a so-called reverse combustion type and has a so-called latent heat recovery type heat exchanger.

  As is well known, the general basic structure of a hot water supply apparatus equipped with a combustor is such that the combustion gas generated by the combustor travels in a certain path, and in the progressing process, the heat exchanger water passage tube. Heat exchange between the (water pipe) and the combustion gas is performed. The combustion gas after the heat exchange is led to the exhaust port and discharged as exhaust gas. In such a water heater, as means for increasing the heat recovery rate from the combustion gas and increasing the heat exchange efficiency, the heat exchanger is a so-called latent heat recovery type, in addition to the sensible heat of the combustion gas, There is also means for recovering the latent heat (more precisely, the latent heat of water vapor in the combustion gas).

  However, when adopting the above-described means, there has conventionally been a problem to be solved as described below.

  That is, when latent heat recovery is performed in the heat exchanger, water vapor in the combustion gas condenses and many drains (condensed water) are generated, which are dripped from the heat exchanger into the combustion gas flow path. Therefore, there is a possibility that a wide area in the combustion gas flow path is contaminated by the drain. As a means for preventing this, for example, as described in Patent Document 1, it is conceivable that a receiving pan is disposed below the heat exchanger and the drain is received by the receiving pan. However, using a dedicated member for receiving the drain in this way causes an increase in the number of components and increases the manufacturing cost.

  When kerosene, city gas, or the like is used as the combustor fuel, the drain has a strong acidity of about PH3 that absorbs sulfur oxide, nitrogen oxide, and the like in the combustion gas. For this reason, if the drain is allowed to flow through a general drainage path as it is, the piping will be corroded and environmental deterioration such as water pollution will be caused, and a neutralizer will be used before the drain is discarded. It is desirable to perform sum processing. For example, Patent Document 2 describes the configuration of such a neutralizer. However, in installing this neutralizer, it is possible to save space from the viewpoint of suppressing the overall size of the apparatus. desired. Note that when a combustor of the type that burns fuel oil such as kerosene by spraying from the spray nozzle is used, it is sprayed from the spray nozzle during ignition, extinguishing, or other incomplete combustion. In some cases, the remaining fuel oil enters the drain unburned. However, the conventional neutralizer only performs the neutralization treatment of the drain using the neutralizer containing the neutralizing agent. Even if the fuel oil or the like is mixed in the drain, the fuel oil can be eliminated. The drain is discarded without being made. This causes water pollution and is not preferable from the viewpoint of environmental protection.

  When the heat exchanger has a structure having a primary heat exchanging part for recovering sensible heat and a secondary heat exchanging part for recovering latent heat, this heat exchanger has a general structure not having a secondary heat exchanging part. Larger than heat exchanger. For this reason, conventionally, there has been a problem that the entire hot water supply apparatus is also enlarged. Furthermore, unlike the primary heat exchange part, it is preferable that the secondary heat exchange part and the can surrounding the same are made of a material having excellent corrosion resistance. However, if the cans of the secondary heat exchanging part and the cans of the primary heat exchanging part are made different from each other as described above, the number of parts increases and the manufacturing cost increases. The problem of becoming will also occur.

Japanese Patent Laid-Open No. 9-287831 JP 2000-314558 A

  The present invention has been conceived under such circumstances, and it is possible to appropriately perform the treatment of the drain generated along with the heat recovery while increasing the heat recovery rate from the combustion gas. An object of the present invention is to provide a hot water supply device that can suppress the increase in size of the entire device.

  In order to solve the above problems, the present invention takes the following technical means.

  A hot water supply apparatus provided by the first aspect of the present invention is a combustor that combusts fuel downward, and proceeds upward by making a U-turn at the bottom after the combustion gas generated by the combustor is advanced downward. A hot water supply apparatus, comprising: a combustion gas flow path that leads to an exhaust port by causing a heat exchanger having a water passage tube that performs heat exchange with the combustion gas in a lower region of the combustor. The heat exchanger includes a primary heat exchange part for recovering the sensible heat of the combustion gas, and a heat exchange between the primary heat exchange part and the primary heat exchange part. And a secondary heat exchanging section that enables latent heat recovery from the combustion gas that has finished, and is generated at the bottom of the combustion gas flow path along with the latent heat recovery from the secondary heat exchanging section. Receive the falling drain and collect it in a certain place An inclined bottom plate portion is provided, and neutralization processing means for receiving the drain from the bottom plate portion and performing neutralization processing is provided immediately below the bottom plate portion. .

  According to such a configuration, the sensible heat is recovered by the primary heat exchange part of the heat exchanger, and the latent heat is recovered by the secondary heat exchange part, thereby increasing the heat recovery rate from the combustion gas and heat exchange. While the efficiency can be increased, the drain (condensed water) generated by the latent heat recovery in the secondary heat exchange section is received and properly collected by the bottom plate portion of the bottom of the combustion gas flow path below it. Therefore, the portion other than the bottom of the combustion gas flow path can be prevented from being contaminated by the drain, and a dedicated member for receiving the drain is not required, and the manufacturing cost can be reduced by reducing the number of parts. It is. Further, the drain can be appropriately neutralized using a neutralization treatment means and then discarded, but this neutralization treatment means uses a space immediately below the bottom plate portion of the bottom of the combustion gas flow path. Since it is provided and utilized, it is possible to prevent the neutralization processing means from becoming large and bulky.

  In a preferred embodiment of the present invention, the combustor is an oil combustor in which fuel oil is sprayed or vaporized and combusted, and the drain is supplied to the neutralization processing unit below the bottom plate portion. An oil trapping means capable of trapping oil contained in the drain is provided before or after the operation. According to such a configuration, even if non-combustible fuel oil is mixed into the drain due to poor ignition or other reasons when the fuel oil is burned, the fuel oil is captured by the oil capturing means. Therefore, it becomes possible to discharge the drain which does not contain fuel oil and is appropriately neutralized to the outside, which is suitable for preventing water pollution and protecting the environment.

  In a preferred embodiment of the present invention, an oil sensor for detecting when oil remains in the drain is provided downstream of the oil capturing means in the drain flow direction. According to such a configuration, when some trouble occurs and an abnormal situation occurs in which the fuel oil mixed in the drain cannot be properly captured by the oil capturing means, it is possible to accurately detect this and take countermeasures. Can be taken quickly. As an example of the trouble, for example, there is a situation in which fuel oil leaks in a combustor and so much fuel oil is mixed into the drain that oil capture is difficult by the oil trapping means of the drain treatment device.

  In a preferred embodiment of the present invention, there is provided a bottom casing having the bottom plate portion and forming the bottom portion of the combustion gas flow path, and the secondary heat exchange portion is provided in the bottom casing. It has been. According to such a configuration, the space in the bottom casing is effectively used for installing the secondary heat exchange section, and the secondary heat exchange section can be prevented from being bulky outside the bottom casing. Therefore, although the performance of the heat exchanger is enhanced by the provision of the secondary heat exchange unit, it is possible to appropriately suppress an increase in the size of the entire hot water supply apparatus. Further, since the secondary heat exchange part is surrounded by the bottom casing, it is not necessary to separately provide a dedicated member for enclosing the secondary heat exchange part. That is, the bottom casing plays a role as a can for a heat exchanger that surrounds the secondary heat exchange portion in addition to the role of circulating the combustion gas so as to make a U-turn. Therefore, the structure is rational, and it is possible to reduce the manufacturing cost by reducing the component cost. Furthermore, in the present invention, when recovering the latent heat of the combustion gas using the secondary heat exchange section, since the drain can be generated only in the bottom casing, other parts of the combustion gas flow path There is no risk of contamination by the drain, and drain recovery is easier.

  In preferable embodiment of this invention, the said secondary heat exchange part is comprised using the some U-shaped pipe | tube, and each said U-shaped pipe | tube has a pair of opening part for water_injection and a hot_water | drain. The base end portion is a fixed end, and the tip end portion is provided as a free end or a movable support end that allows displacement in the longitudinal direction of the U-shaped tube. According to such a configuration, it is possible to prevent a large stress from being generated when the U-shaped tube is thermally expanded or contracted, and to support the base end portion of the U-shaped tube on an appropriate portion. Only the whole or substantially the entire U-shaped tube can be disposed at a predetermined position in the combustion gas flow path, and the attachment is easy. In addition, the efficiency of heat exchange can be easily increased or decreased by simply changing the length of the U-shaped tube, and the design of the heat exchanger becomes easy. Further, since the pair of opening portions for entering and discharging the U-shaped pipe are close to each other, when a header portion is provided for allowing water to enter and exit from the U-tube, the structure of the header portion is connected to this. The piping structure can be made simple and compact.

  A hot water supply apparatus provided by the second aspect of the present invention includes a combustor that burns fuel downward, a can body disposed below the combustor, a can body located below the can body, and the can. A bottom casing connected to the lower part of the body, an exhaust duct connected to the bottom casing so as to stand on the bottom casing, and a series of the can body, the bottom casing, and the exhaust duct. Combustion gas which is formed to be connected to the combustion chamber and which has been made to make downward U-turns in the bottom casing from the fuel combustion region of the combustor is caused to enter the exhaust duct upward by making a U-turn in the bottom casing A hot water supply apparatus, comprising: a gas flow path; and a heat exchanger having a primary heat exchange section and a secondary heat exchange section for performing heat exchange between the combustion gas and the water passage tube. The primary heat exchanging portion is provided in the can body, and the secondary heat exchanging portion is provided with a plurality of U-shaped tubes provided in the bottom casing, and the plurality of U-shapes. The pipe has a base end portion having a pair of openings for water entry and hot water as a fixed end, and a distal end portion that is free or movable support end allowing displacement in the longitudinal direction of the U-shaped tube. The bottom casing is provided with an inclined bottom plate portion so as to be able to receive the drain generated in the secondary heat exchange portion and collect it at a certain location, and immediately below the bottom plate portion. The neutralization processing means for receiving the drain from the bottom plate portion and neutralizing the oil, and the oil contained in the drain before or after the drain is supplied to the neutralization processing means. Capable oil catch Means and is provided, wherein the drain flow direction downstream from the oil trapping means, an oil sensor for detecting is characterized by being provided with this when the oil to the drain is left mixing.

  According to such a configuration, all of the same effects as described in the hot water supply device provided by the first aspect of the present invention and the preferred embodiment thereof can be obtained, and the heat exchange efficiency is increased. At the same time, the drain treatment and the treatment of the oil mixed in the drain can be accurately performed, and the overall size can be suppressed to reduce the manufacturing cost.

  In a preferred embodiment of the present invention, the blower for supplying combustion air from the upper side to the lower side of the combustor and the primary heat exchange part of the heat exchanger are heated to prevent freezing. The air blower is driven when the heater is turned on, so that air heated by using the heater is supplied to the secondary heat exchange unit. It is configured. According to such a configuration, the secondary heat exchange part can be warmed using the air heated by the antifreeze heater of the primary heat exchange part, and the antifreeze dedicated to the secondary heat exchange part can be used. There is no need to provide a heater. In addition, when the air heated by the heater reaches the bottom plate portion of the combustion gas flow path after passing through the secondary heat exchange portion, this portion is heated and the neutralization processing means located immediately below it is heated. As a result, it is possible to prevent the drain in the neutralizing means from freezing.

  In a preferred embodiment of the present invention, a heater for heating the bottom portion or the vicinity of the bottom portion where the secondary heat exchanging portion is provided in the combustion gas flow path is provided. The raised air can naturally rise toward the primary heat exchange section. According to such a configuration, in addition to preventing the secondary heat exchange part from being frozen by the heater, the primary heat exchange part naturally raises the air heated by the heater toward the primary heat exchange part. It is also possible to prevent the heat exchange part from freezing. Therefore, an antifreezing heater dedicated to the primary heat exchange unit is not required. Further, it is possible to prevent the drain in the neutralization tank from freezing by causing the heat generated from the heater to act on the neutralization tank.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a hot water supply apparatus according to the present invention. The hot water supply device A1 of the present embodiment includes a combustor 1, a heat exchanger HT, a bottom casing 3, a silencer 19, a drain treatment device B1, a freezing prevention heater H1, and an outer case 90 that covers them all. Yes. The silencer 19 corresponds to an example of an exhaust duct referred to in the present invention.

  The combustor 1 is of a reverse combustion type in which oil such as kerosene is used as fuel, and this fuel is injected downward from the spray nozzle 10 and ignited by the spark plug 12 to burn, thereby forming a heat exchanger HT. The spray nozzle 10 is provided in the upper part in the can 11 mounted on the can 20 to be performed. Fuel oil is supplied to the spray nozzle 10 from an oil tank (not shown) via a fuel supply unit 15. The fuel supply unit 15 includes an electromagnetic pump, an electromagnetic valve 15a, an oil supply pipe 15b, and the like. On the can body 11, a blower fan 13 is provided for sending combustion air downward into the can body 11, and the combustion air is provided around the spray nozzle 10 and a combustion cylinder 14 provided over a region below the spray nozzle 10. It is designed to enter inside. The combustion cylinder 14 has a plurality of vent holes on its peripheral wall, and plays a role of promoting mixing of the sprayed oil and the combustion air by using the combustion air as a swirl flow in the combustion cylinder 14. .

  The bottom casing 3 has a substantially rectangular parallelepiped shape, is disposed below them so as to support the can 20 and the silencer 19, and is connected to the bottoms thereof. Communication openings 81 a and 81 b communicating with the bottom opening of the can body 20 and the bottom opening of the silencer 19 are provided in the area near the one end and the other end near the upper portion of the bottom casing 3. With this structure, the inside of each of the can body 20, the bottom casing 3, and the silencer 19 is a series of combustion gas flow paths 8, and the combustion gas generated by the combustor 1 is stored in the can body 20. After proceeding downward and flowing into the bottom casing 3, the direction is changed upward so as to make a U-turn and flows into the silencer 19, and exhausted as exhaust gas from the exhaust port 19 a at the top of the silencer 19. Is done. In this hot water supply device A1, since the can body 20 and the silencer 19 that support the combustor 1 are placed together on the bottom casing 3 so as to be close to each other and arranged, A large dead space is not formed in the exterior case 90, and a configuration in which they are reasonably assembled in a space efficient manner can be achieved.

  The heat exchanger HT has a primary heat exchange part 2A and a secondary heat exchange part 2B. The primary heat exchange part 2A is for recovering sensible heat of combustion gas, and is provided in a region near the bottom in the can 20. The primary heat exchanging portion 2A has a structure similar to, for example, a water tube structure of a conventional general heat exchanger, and a tube body 22b having a plurality of fins 24 penetrates the can body 20 in a substantially horizontal direction. It is structured. The anti-freezing heater H1 is, for example, an electrothermal type, and is attached to, for example, a portion of the tube body 22b exposed to the outside of the can body 20 so that the primary heat exchange section 2A can be heated. As will be described later, the heater H1 is combined with the blower blower 13 to help prevent the secondary heat exchange unit 2B from freezing.

  The secondary heat exchange unit 2B is for recovering the latent heat of the combustion gas, and is provided in the bottom casing 3. The secondary heat exchange unit 2B has a configuration in which a plurality of U-shaped tubes 23 including a plurality of plate-like fins 26 are used as pipes for water flow and heat transfer. The base end portion of each U-shaped tube 23 having a pair of openings 23a and 23b passes through one side wall 30a of the bottom casing 3 and is connected and fixed to a header portion 25 provided outside the one side wall 30a. ing. On the other hand, the distal end portion 23c of each U-shaped tube 23 is a free end in an unsupported state, and each U-shaped tube 23 is so-called one-sided supported. This support structure is suitable for preventing a large stress from being generated during thermal expansion and contraction of each U-shaped tube 23.

  The plurality of U-shaped tubes 23 are arranged such that their pair of straight tube portions 23d are arranged in the vertical direction, and intersect the longitudinal direction of the plurality of U-shaped tubes 23 as shown in FIG. It is provided so as to be lined up at appropriate intervals in the direction. As clearly shown in FIG. 3A, the plurality of U-shaped tubes 23 are arranged in a stepped manner so that an appropriate height difference h is generated between adjacent ones. If provided in this way, the arrangement of the upper straight tube portions 23d and the arrangement of the lower straight tube portions 23d of the plurality of U-shaped tubes 23 are both staggered. Further, as shown in FIGS. 4A and 4B, each fin 26 is also provided with a plurality of convex portions 27a and 27b that protrude in the horizontal direction on one side thereof. These can be formed all at once by press molding. For example, they are arranged as follows. That is, the plurality of convex portions 27 a are arranged in a horizontal example in the vicinity of the upper edge portion of the fin 26, and are located above the straight tubular body portions 23 d located at the highest level. The plurality of convex portions 27b are located at two intermediate portions through which the pair of straight tube portions 23d of each U-shaped tube 23 passes, and are similar to the straight tube portion 23d of the U-shaped tube 23. It is a staggered arrangement.

  According to such an arrangement of the U-shaped tubes 23 and the structure of the fins 26, for example, as indicated by an arrow n1 in FIG. 3A, the combustion gas is directed toward the highest straight tube portion 23d from above. As it progresses, the combustion gas is divided into two, sandwiching the straight tube portion 23d, as indicated by an arrow n2, and is guided so as to hit the next two straight tube portions 23d. Further, as indicated by an arrow n3, the combustion gas that has come around just below the highest straight tube portion 23d hits the convex portion 27b of the fin 26. On the other hand, as shown by the arrow n4, when the combustion gas hits the convex portion 27a, the combustion gas is divided into two as shown by the arrow n5, and two straight pipes positioned below the combustion gas. Head toward body part 23d. Further, as indicated by an arrow n6, the combustion gas that has come around directly below the convex portion 27a hits the straight tubular portion 23d located below the convex portion 27a. Also in the region where the straight tubular body portions 23d below the plurality of U-shaped tubes 23 and the plurality of convex portions 27b are provided, the combustion gas is one straight tubular body portion 23d or the like as described above. When it hits the convex portion 27b, it is guided so as to flow toward the other straight tube portion 23d and the convex portion 27b. For this reason, in the secondary heat exchanging portion 2B, the degree to which the combustion gas touches the straight tubular portion 23d of the U-shaped tube 23 and the convex portions 27a and 27b of the fin 26 is extremely increased. The heat exchange efficiency of the secondary heat exchange unit 2B can be increased.

  The fins 26 are not limited to the above-described configuration, and can be configured as shown in FIGS. 4A and 4B, for example. That is, the fins 26 shown in these figures are the same as the structure shown in FIG. 3 in that a plurality of U-shaped tubes 23 are arranged in a stepped manner with appropriate steps h. The convex portion 27c is provided so as to be positioned between two straight tube portions 23d adjacent to each other in the horizontal direction. According to such a configuration, since the gap between the convex portion 27c and the two straight tubular body portions 23d is narrowed, when the combustion gas has advanced to these portions, It is possible to effectively act on the cylindrical portion 27c and the straight tubular portion 23d. Therefore, also with such a configuration, the heat exchange efficiency of the secondary heat exchange unit 2B is further enhanced.

  As clearly shown in FIG. 1, each U-shaped tube 23 is concentrated in the bottom casing 3 in a region directly below the communication opening 81 a. A blocking plate 31 for closing the gap portion is provided in the gap portion between the upper portion of the fin 26a near the distal end portion 23c of each U-shaped tube 23 and the upper wall portion 30c of the bottom casing 3. The shielding plate 31 and the fin 26a serve as a combustion gas stopper means, and the combustion gas that has progressed from the inside of the can body 20 to the region directly below does not pass through the secondary heat exchanging portion 2B downward, and thus the bottom casing. It is useful for suppressing that it progresses toward the downstream part of 3, and improving the efficiency of the heat exchange of the secondary heat exchange part 2B. The blocking plate 31 is fixedly attached to, for example, the upper wall portion 30c of the bottom casing 3, but is not fixed to the fin 26a and does not hinder thermal expansion and contraction of the U-shaped tube 23. Yes. Unlike this embodiment, instead of the means for providing the blocking plate 31 separate from the fin 26a, the upper portion of the fin 26a may be extended to close the gap.

  The header section 25 has a pair of chambers 25a and 25b communicating with the water inlet and outlet openings 23a and 23b of the plurality of U-shaped tubes 23, respectively. A tube body having a water inlet 21a is connected to the chamber 25a, and an upstream end 22a ′ of the tube body 22a is connected to the chamber 25b. In the heat exchanger HT of the present embodiment, the water that has entered the water inlet 21a flows into the chamber 25a of the header 25, and then is heated while passing through the plurality of U-shaped tubes 23 and flows out into the chamber 25b. . Next, the water is heated while sequentially flowing through the tubes 22a and 22b, and then flows out from the hot water outlet 21b and is supplied to a predetermined hot water supply destination. If unheated low-temperature water is supplied to each U-shaped tube 23, the efficiency of latent heat recovery of water vapor in the combustion gas is increased. However, the present invention is not limited to such a water flow method.

  Drains resulting from latent heat recovery adhere to the plurality of U-shaped tubes 23 and the fins 26 constituting the secondary heat exchange unit 2B. Therefore, these parts are preferably made of a material such as stainless steel having excellent corrosion resistance. Further, the metal portion that may come into contact with the drain, such as the bottom plate portion 34 of the bottom casing 3, is preferably made of the same material as described above. However, the entire bottom casing 3 or a part of the bottom plate portion 34 or the like can be made of, for example, synthetic resin, and the manufacturing cost can be reduced. This is because the heat exchanger HT has a latent heat recovery function and can sufficiently reduce the temperature of the combustion gas until the combustion gas proceeds to the bottom of the bottom casing 3. Regarding the primary heat exchange part 2A, there are few problems regarding the drain, and the tube body 22b and the fins 24 are made of, for example, copper or a copper alloy excellent in heat conduction and workability. Each U-shaped tube 23 is inclined so that the base end portion has a lower height than the distal end portion 23c. According to such a configuration, when draining water in each U-shaped tube 23 for reasons such as disabling the hot water supply device A1 for a long period of time, the above-described inclination is utilized to Water can be flowed to the base end side, and the operation can be performed smoothly.

  The bottom plate part 34 of the bottom casing 3 also has a role of receiving a drain dripping from the secondary heat exchange part 2B. The bottom plate portion 34 has a discharge port 34a for sending the received drain to the drain processing apparatus B1, and is so high that the received drain approaches the discharge port 34a so that the drain can be efficiently collected in the discharge port 34a. Inclined to be lower. Although not shown in the drawing, the bottom plate portion 34 is inclined so that the drain can be collected in the discharge port 34a even in the direction orthogonal to the paper surface of FIG.

  The drain processing apparatus B1 is connected to the discharge port 34a via the piping member 34b so as to receive the drain from the discharge port 34a of the bottom casing 3. The drain processing apparatus B1 is configured to perform a neutralization process of the drain and a capturing process of fuel oil and other impurities mixed in the drain. More specifically, when ignition failure or the like occurs in the combustor 1, unburned fuel oil sprayed from the spray nozzle 10 may travel into the bottom casing 3 and be mixed into the drain. This drain processing apparatus B1 also has a function of capturing the fuel oil mixed in the drain in this way.

  The drain treatment apparatus B1 includes, for example, a blow-molded synthetic resin container 40, part of which is formed as a separation treatment tank 4A, and the other part of which is a granular neutralizer 48 such as calcium carbonate. It is set as the accommodated neutralization tank 4B. This drain processing device B1 is disposed in a space 91 formed below the bottom casing 3 so that the drain processing device B1 is accommodated in the bottom of the outer case 90 with good space efficiency. As clearly shown in FIG. 5, the separation processing tank 4A is substantially box-shaped, and a partition wall 41A extending downward is formed on the upper wall portion thereof. The interior is partitioned into first and second chambers 43a and 43b in which the bottoms communicate with each other via the communication part 46A. An oil adsorption filter 42 is provided in the second chamber 43b. The oil adsorbing filter 42 is composed of, for example, fibrous activated carbon, various activated carbons such as Yasuga activated carbon, vegetable fibers such as Kapok fibers, chemical polymers of polymer polymers such as polypropylene, or hydrocarbon granules. Specifically, various materials can be used as long as they have excellent oil adsorbability and poor water adsorbability. An opening 43b ′ with a lid is provided on the upper wall portion of the second chamber 43b, and this opening 43b ′ serves as an inlet / outlet for the oil adsorption filter 42.

  In the separation processing tank 4A, when the drain flows into the first chamber 43a from the upper inflow port 45a, the drain is stored at an appropriate liquid level height Ha, fuel oil having a specific gravity smaller than the drain, and the like. These contaminants float on the liquid surface of the drain, and their layer F1 is formed. However, since the partition wall 41A exists in the vicinity of the liquid level, the fuel oil or the like is suppressed from flowing into the second chamber 43b and is captured in the first chamber 43a. Even if the fuel oil passes through the communication portion 46A and flows into the second chamber 43b, the fuel oil is adsorbed and captured by the oil adsorption filter 42. Therefore, the fuel oil is appropriately prevented from passing through the circulation port 45b and flowing into the neutralization treatment tank 4B. Contaminants having a specific gravity greater than that of the drain become precipitates m. Although this deposit m may flow into the second chamber 43b, since the flow port 45b of the second chamber 43b is at a certain height Ha from the bottom, the precipitate m is neutralized. Inflow into the processing tank 4B is appropriately prevented, and is also prevented by the oil adsorption filter 42.

  A drain level sensor 97 and a discharge port 47a are also provided in the first chamber 43a of the separation processing tank 4A. The liquid level sensor 97 has an abnormally high level in which the liquid level of the drain in the separation processing tank 4A exceeds the height Ha above a certain level due to clogging or the like downstream of the first chamber 43a. When this happens, this is detected, and the detection signal is transmitted to a control unit (not shown) that controls the operation of the hot water supply apparatus A. For example, when the hot water supply device A is not used for a long period of time, the discharge port 47a is provided to prevent the drain in the separation treatment tank 4A from being frozen in the winter by pulling out the drain to the outside. Is closed by a plug 47b such as a screw member.

  The neutralization treatment tank 4B has a substantially box shape with openings 43c ′ and 43d ′ with lids for introducing the neutralizing agent 48 therein. However, since the upper wall portion is provided with a partition wall 41B extending downward, the inside of the neutralization treatment tank 4B has first and second bottom portions communicating with each other via the communication portion 46B. Chambers 43c and 43d. In the neutralization tank 4B, when the fuel oil is not reliably captured in the separation tank 4A and the fuel oil flows into the neutralization tank 4B, the separation tank 4A is described. By the same principle, fuel oil is trapped in the first chamber 43c. That is, in the first chamber 43c, the fuel oil floats on the drain, and is prevented from flowing into the second chamber 43d due to the presence of the partition wall 41B and is captured. In the neutralization tank 4B, when the drain flows from the first chamber 43c through the communication portion 46B and flows into the second chamber 43d, the drain follows a path that dives under the partition wall 41B. Therefore, it is possible to obtain an effect that the drain passage length in the neutralization treatment tank 4B is made long so that the drain is brought into contact with many neutralizing agents 48 and the neutralization treatment is efficiently performed.

  A drain circulation pipe 50 that receives a drain from the outlet 45c of the neutralization tank 4B and guides the drain to the outside of the outer case 90 is connected to the downstream side of the neutralization tank 4B. The oil sensor 5 is attached. The oil sensor 5 is used to determine whether or not oil remains in the drain that has passed through the neutralization tank 4B. The oil sensor 5 also has a function of detecting when fuel oil leaks from the fuel supply unit 15 of the combustor 1 as will be described later. As shown in FIG. 6, the oil sensor 5 has a configuration in which an oil swelling substance 52 is accommodated in a casing 51. The casing 51 is made of, for example, a porous sintered resin having hydrophobicity, lipophilicity, and oil permeability. The oil swelling material 52 is made of, for example, silicon resin powder. In the oil sensor 5, if oil is mixed in the drain flowing in the drain circulation pipe 50, the oil permeates the casing 51 and is absorbed by the oil swelling material 52. The volume increases and the movable member 53 separately provided in the casing 51 is raised. Then, the detection switch 54 provided above is turned on by contact with the movable member 53, and a signal indicating oil detection is input to the control unit.

  In the oil sensor 5, the upper flange portion 51 a of the casing 51 is joined to the base member 55, and the base member 55 is fixed to the upper wall portion 50 a of the drain circulation pipe 50 by the bolt 92. A gap 56 that allows oil to pass therethrough is formed between 50a and the base member 55. Due to this structure, the oil sensor 5 has a fuel oil leak in the fuel supply section 15 of the combustor 1, and when the fuel oil falls on the upper wall portion 50 a, This fuel oil can also be detected by passing through 56 and entering the inside of the casing 51. As clearly shown in FIG. 1, the drain circulation pipe 50 protrudes from the bottom of the bottom casing 3 to one side thereof, and when fuel oil leakage occurs in the fuel supply section 15 above the drain casing 50, It is provided so that this fuel oil can be received appropriately. Preferably, the drain circulation pipe 50 has a relatively large width in a direction orthogonal to the paper surface of FIG. 1 so as to have a wide area in plan view, and fuel oil has dropped on the upper wall portion 50a. In this case, the whole or a part of the upper wall portion 50a is concave so that the fuel oil can be properly guided to the gap 56. More preferably, the upper surface of the concave portion is inclined so that the height of the concave portion decreases toward the oil sensor 5.

  Next, the operation of the above-described hot water supply apparatus A1 will be described.

  First, when the combustor 1 is driven to burn fuel such as kerosene, the combustion gas travels downward due to the blowing action from the blower fan 13 and the sensible heat is recovered by the primary heat exchange unit 2A. The Next, when the combustion gas still travels downward and proceeds into the bottom casing 3, it reaches the location where the secondary heat exchange unit 2B is disposed, and latent heat is recovered in this portion. And the combustion gas which passed under the secondary heat exchange part 2B flows in into the silencer 19 after that, and is discharged | emitted as exhaust gas from the exhaust port 19a.

  In the hot water supply device A1, the secondary heat exchange unit 2B is provided in the bottom casing 3 so that the space in the bottom casing 3 is effectively used, and does not occupy the space outside the bottom casing 3. It has become. For this reason, size reduction of the whole hot water supply apparatus A1 is achieved. Further, the bottom casing 3 surrounds the entire secondary heat exchange part 2B and also serves as a can for the secondary heat exchange part 2B. Unlike this embodiment, for example, if the secondary heat exchange part 2B is to be provided outside the bottom casing 3, a can surrounding the secondary heat exchange part 2B is required. In this hot water supply device A1, Such a can body is unnecessary. Therefore, the cost can be reduced by reducing the number of parts. Furthermore, since the secondary heat exchanging portion 2B is configured using a U-shaped tube 23, and the support is a so-called single-sided support, as described above, it has a stress relaxation function during thermal expansion and contraction. In addition to being obtained, the support structure of the U-shaped tube 23 is also simplified. Furthermore, since the opening portions 23a and 23b for entering and discharging hot water of the plurality of U-shaped tubes 23 can be arranged close to each other and concentrated in a certain region, the header portion 25 connected to them. Can be made into a compact and simple structure. As a result, the manufacturing cost of the hot water supply device A1 is further reduced.

  Since the secondary heat exchange part 2B is provided in the region immediately below the communication opening 81a, the combustion gas that has passed through the primary heat exchange part 2A is earlier than the secondary heat exchange part 2B. Can act. In addition, while the traveling direction of the combustion gas at that time remains downward, each U-shaped tube 23 extends in a direction intersecting therewith. Therefore, heat exchange with the combustion gas can be performed efficiently. Further, in the secondary heat exchanging portion 2B, as described above, the plurality of U-shaped tubes 23 are provided in a stepped manner in the height direction, and the convex portions 27 are provided on the plurality of fins 26 with a predetermined height The heat is also provided by the fact that the combustion gas is not arranged to flow downstream in the bottom casing 3 before passing through the secondary heat exchanging section 2B by the blocking plates 31 and the fins 26a. Exchange efficiency is increased.

  In the secondary heat exchange unit 2B, many drains are generated as the latent heat is recovered. The drains drip onto the bottom plate part 34 of the bottom casing 3 and quickly from the discharge port 34a to the drain processing apparatus B1. And it is sent smoothly. For this reason, it is appropriately avoided that the drain adheres over the wide area of the inner wall of the combustion gas flow path 8 and remains. Also, a dedicated member for receiving the drain is not necessary. On the other hand, the spray nozzle 10 injects the fuel oil downward, and when the combustion of the combustor 1 is stopped and the fuel is not ignited due to the ignition failure, the fuel oil is generated. It is easy to be collected in the bottom casing 3. On the other hand, as described above, many drains can be collected in the bottom casing 3 and discharged to the outside. Therefore, in the bottom casing 3, an action of actively discharging unburned fuel oil to the outside using the drain can be obtained, and the unburned combustion oil remains in the combustion gas flow path 8. It is suppressed that it becomes.

  The drain discharged below the bottom casing 3 is discharged to the outside of the outer case 90 through the separation processing tank 4A, the neutralization processing tank 4B, and the drain circulation pipe 50. In this case, as described above, the fuel oil is first captured in the first chamber 43a of the separation tank 4A, and the remaining fuel oil not captured thereby is captured by the oil adsorption filter 42 in the second chamber 43b. Is done. Furthermore, it is also captured by the first chamber 43c of the neutralization tank 4B. Contaminants other than the fuel oil are also captured in the separation processing tank 4A. In addition, the neutralization treatment of the drain is performed in the neutralization treatment tank 4B. Therefore, it is possible to discharge a drain that does not contain fuel oil and impurities and has been appropriately neutralized, which is preferable from the viewpoint of environmental protection.

  In the normal operation state of the water heater A1, even if unburned fuel oil is generated due to, for example, poor ignition of the fuel oil, the amount is relatively small. Therefore, for example, even when the hot water supply device A1 is used for a long period of 10 years or more, for example, it is possible to make so-called maintenance-free without having to replace the oil adsorption filter 42 even once. However, in actual use, it may be assumed that a large amount of fuel oil flows into the bottom casing 3 due to a failure of the combustor 1 due to factors that are difficult to predict. When such a situation occurs, it may be difficult to capture the entire amount of fuel oil by the oil adsorption filter 42 and other oil capturing means described above. On the other hand, in the hot water supply device A1, when such a situation occurs, the fuel oil flowing in the drain circulation pipe 50 is detected by the oil sensor 5 and a notification to that effect is given to the user. Therefore, it is possible to immediately detect the abnormality and take an appropriate measure. Further, based on the detection of the fuel oil, it is possible to perform control such as emergency stop of the driving of the combustor 1. Unlike the above, for example, when the oil adsorption filter 42 and the separation processing tank 4A are formed in a relatively small size and the oil adsorption filter 42 is replaced at appropriate intervals, the oil sensor 5 described above is used. It is also possible to use the oil detection by detecting the replacement time of the oil adsorption filter 42. As described above, the oil sensor 5 receives the fuel oil by the upper wall portion 50a of the drain circulation pipe 50 and can detect this when the fuel oil leakage occurs in the fuel supply path of the combustor 1. It is provided as follows. Therefore, in this hot water supply apparatus A1, it is not necessary to separately provide a dedicated sensor for detecting the leakage of the fuel oil as described above, which is more preferable for reducing the manufacturing cost.

  When the hot water supply device A1 is installed in a cold district or the like, it is necessary to prevent freezing of water supplied and stored in the heat exchanger HT. Therefore, in this hot water supply device A1, the outside air temperature, the water temperature, and the like are detected using a temperature sensor (not shown), and when the detected temperature falls below a certain value, the antifreezing heater H1 is driven. Thereby, primary heat exchange part 2A is heated, and freezing of water in tube 22b is prevented. On the other hand, the blower fan 13 is driven as the heater H1 is driven. By this operation, the air heated in the primary heat exchanging part 2A is sent into the bottom casing 3 and acts on the secondary heat exchanging part 2B, and the water in this part is prevented from freezing. As a result, the antifreezing heater dedicated to the secondary heat exchange unit 2B is not necessary. The driving of the blower fan 13 does not have to be continuous, and energy saving may be achieved by intermittent driving. On the other hand, the drain processing apparatus B <b> 1 is partitioned from the bottom casing 3 through the bottom plate portion 34, but is disposed close to the bottom casing 3. Accordingly, when the inside of the bottom casing 3, particularly the bottom plate portion 34, is heated by the above-described blowing of heated air, the drain processing apparatus B can also be heated. As a result, an effect of preventing freezing of the drain stored in the drain processing apparatus B can also be expected.

  In addition, the freezing prevention of the water of the heat exchanger HT can also be aimed at by the structure which provided the heater H2 for freezing prevention in the bottom casing 3, as shown by the virtual line of FIG. The heater H2 may be provided either inside or outside the bottom casing 3. Moreover, since the water in the U-shaped tube 23 should just be heated directly or indirectly, you may attach to the header part 25 or the U-shaped tube 23. FIG. According to such a configuration, in addition to the secondary heat exchange unit 2B being heated to prevent freezing of this portion by driving the heater H2, the air heated in the bottom casing 3 naturally rises. To reach the primary heat exchange section 2A. This action also prevents the freezing of the water in the primary heat exchange section 2A. Further, as in the case of the heater H1, by heating the bottom casing 3, the drain processing device B1 is also heated, and an effect of preventing freezing of the drain stored therein can be expected.

  FIG. 7 shows another example of the secondary heat exchange unit. In FIG. 7 and subsequent figures, the same or similar elements as those of the above embodiment are denoted by the same reference numerals as those of the above embodiment.

  In the configuration shown in FIG. 7, the plurality of U-shaped tubes 23 constituting the secondary heat exchange unit 2 </ b> B are made longer than those in the above-described embodiment, and their tip portions 23 c are silenced in the bottom casing 3. It extends to a region directly below the communication opening 81b for communicating with the inside of the vessel 19. A gap 33 is formed between the tip 23c of each U-shaped tube 23 and the other side wall 30b of the bottom casing 3, and a blocking plate 32 for closing the lower portion of the gap 33 is attached to the other side wall 30b. It has been. The blocking plate 32 serves as a combustion gas stopper means. In FIG. 7, the distal end portion 23 c of the U-shaped tube 23 is an unsupported free end, but unlike this, for example, the distal end portion 23 c of the U-shaped tube 23 is supported on the blocking plate 32. In addition, when the U-shaped tube 23 is thermally expanded or contracted, the distal end portion 23c may slide on the blocking plate 32.

  In the present embodiment, the combustion gas can act on each U-shaped tube 23 not only in the region below the communication opening 81 a in the bottom casing 3 but also in the lower flow region of the communication opening 81 b. In the lower region, the combustion gas travels upward, and the traveling direction and the direction in which each U-shaped tube 23 extends are also directions that intersect each other. Therefore, heat exchange is also preferably performed. Further, since the combustion gas is prevented from directly traveling upward through the gap 33 by the blocking plate 32, a large amount of combustion gas can be applied to each U-shaped tube 23, and the efficiency of heat exchange is further enhanced. . Thus, if the secondary heat exchange part 2B is comprised using the U-shaped tube 23, heat recovery can be performed at a desired heat recovery rate by changing the length of the U-shaped tube 23 in various ways. This makes it possible to design a heat exchanger.

  8 to 10 show other examples of the drain processing apparatus.

  In the drain processing apparatus shown in FIG. 8A, an upward partition wall 41a is provided at the bottom immediately below the partition wall 41A of the separation processing tank 4A, and is formed between the pair of partition walls 41A and 41a. The first and second chambers 43a and 43b communicate with each other through the communication portion 46A. The communication portion 46A communicates the portions that are slightly higher than the bottom portions of the first and second chambers 43a, 43b, and the partition wall 41a has the sediment m at the bottom portion of the first chamber 43a in the second chamber. It plays the role which suppresses flowing into 43b. As understood from the present embodiment, the communication portion 46A is replaced with or in addition to the configuration in which the bottom portions of the first and second chambers 43a and 43b communicate with each other, and the first and second chambers 43a and 43b. The intermediate portion in the height direction may be configured to communicate with each other. Of course, the same applies to the communication portion 46B provided in the neutralization tank 4B.

  In the drain processing apparatus shown in FIG. 8B, the partition wall 41A of the separation processing tank 4A has a bottom surface portion 410 and a pair of rising surface portions 411 rising from both side edges of the bottom surface portion 410. It has a letter shape or a substantially U-shape. As a result, the first and second chambers 43a and 43b are separated by a relatively large size that is the same as the width L of the bottom surface portion 410, and the communication portion 46A has a tunnel shape that has the same length as the width L. Yes. Even with such a configuration, it is possible to capture fuel oil and other contaminants having a lighter specific gravity than the drain in the first chamber 43a based on the same principle as the above-described embodiment. In the embodiments described so far, for example, a part of the blow-molded container 40 is projected as the partition wall 41A as it is, so that the partition wall 41A is folded back into a substantially V-shaped or substantially U-shaped cross section. However, the present invention is not limited to this. In the present invention, the partition wall 41A may be formed by using a member different from the container constituting the separation processing tank 4A, and it is needless to say that the partition wall 41A can be formed in a simple flat shape without folding. Further, the first and second chambers 43a and 43b are formed by separate members, and are connected by, for example, a cylindrical member, so that the inside of the cylindrical member serves as the communication portion 46A. You can also. The same applies to the partition wall 41B of the neutralization tank 4B and the first and second chambers 43c and 43d.

  In the drain treatment apparatus shown in FIG. 9 (a), the separation treatment tank 4A is arranged downstream of the neutralization treatment tank 4B (downstream in the drain flow direction). The drain flows from the inflow port 45d into the neutralization treatment tank 4B and is neutralized, then passes through the flow port 45e and flows into the separation treatment tank 4A, and then passes through the discharge port 45f and passes through the drain flow pipe. 50 flows in. The liquid level sensor 97 is preferably provided at the most upstream position of the drain processing apparatus. In the present embodiment, the liquid level sensor 97 is provided in the first chamber 43c of the neutralization processing tank 4B. Although the neutralization processing tank 4B has a function of capturing oil in the first chamber 43c, fuel oil that is not captured only by this is appropriately captured in the separation processing tank 4A thereafter. In this embodiment, the fuel oil may adhere to the neutralizing agent 48, but the neutralizing function of the neutralizing agent 48 is not greatly deteriorated by the adhesion of the fuel oil. It can be done appropriately. However, from the viewpoint of preventing clogging due to accumulation of fuel oil and impurities in the neutralization treatment tank 4B, it is preferable to provide the separation treatment tank 4A in a stage preceding the neutralization treatment tank 4B.

  In the drain treatment apparatus shown in FIG. 9B, the oil adsorption filter 42 is not provided in the separation treatment tank 4A, and the oil adsorption filter 42 is provided in the chamber 43e connected to the subsequent stage of the neutralization treatment tank 4B. It has been. Even with such a configuration, the drain neutralization process and the removal of fuel oil and other contaminants are appropriately performed as in the above-described embodiment. As understood from the separation treatment tank 4A shown in the present embodiment, the oil trapping means referred to in the present invention may be one that separates and captures fuel oil using a difference in specific gravity with respect to the drain. A configuration without the adsorption filter 42 may be adopted. Of the configuration of the drain treatment apparatus shown in FIG. 9B, the separation treatment tank 4A and the oil adsorption filter 42 both correspond to an example of the oil trapping means referred to in the present invention. Therefore, in the present invention, when the neutralization processing means and the oil trapping means are combined, the separation processing tank 4A and the neutralization processing tank are provided without the oil adsorption filter 42 in the configuration shown in FIG. It is also possible to adopt a configuration in which the neutralization treatment tank 4B and the oil adsorption filter 42 are merely combined without including the separation treatment tank 4A.

  The drain processing apparatus B2 shown in FIG. 10 has a configuration in which an accommodating portion 49 that accommodates the oil adsorption filter 42 and the neutralizing agent 48 is formed integrally with the bottom casing 3. More specifically, the bottom casing 3 includes a plurality of side wall portions 39 extending below the bottom plate portion 34 having the discharge ports 34a, and an additional bottom plate portion 38 that closes the bottom opening of these side wall portions 39. The housing part 49 is formed below the bottom plate part 34 by these. An oil adsorption filter 42 is disposed below and around the discharge port 34a in the storage portion 49, and the adjacent region is a neutralization treatment tank 4B in which the neutralizing agent 48 is stored. ing. The oil adsorption filter 42 and the neutralization treatment tank 4B are partitioned by a partition wall 49a, and the drain that flows into the arrangement region of the oil adsorption filter 42 passes through the partition wall 49a to the neutralization treatment tank 4B. It flows in and then flows out from the outlet 45g.

  In the present embodiment, since the drain processing apparatus B2 is configured by using the bottom casing 3, unlike the above-described embodiment, it is not necessary to separately use a container dedicated to the drain processing apparatus. As will be understood from the present embodiment, the present invention may be configured such that the drain treatment apparatus is integrally built in the hot water supply apparatus.

  As is clear from these embodiments, the drain treatment apparatus can have various configurations. However, in the present invention, at least the drain treatment apparatus is provided with a neutralization treatment means capable of neutralizing the drain. It only has to be.

  11 and 12 show other examples of the oil sensor.

  In the configuration shown in FIG. 11, a step or recess is formed in the lower surface portion of the base member 55 of the oil sensor 5, whereby a fuel oil guide gap 56 is formed between the base member 55 and the upper wall portion 61. Is provided. Even with such a configuration, the same effect as the oil sensor 5 shown in FIG. 6 can be obtained.

  In the configuration shown in FIG. 12, one or a plurality of through holes 56 </ b> A are provided in the base member 55 of the oil sensor 5. According to such a configuration, when the fuel oil flows on the support member 55, the fuel oil passes through the through hole 56 </ b> A and travels toward the casing 51. As understood from the present embodiment, the present invention can be configured to detect the fuel oil flowing directly on the oil sensor 5 when a fuel leak occurs in the fuel supply unit 15 of the combustor 1. . Of course, in the present invention, it is not essential for the oil sensor 5 to detect such an oil leak, and as a means for detecting the oil leak, another dedicated oil sensor may be provided.

  In the hot water supply device A2 shown in FIG. 13, the secondary heat exchange unit 2B is not provided in the bottom casing 3, and the secondary heat exchange unit 2B includes the can body 20 and the bottom casing 3 of the primary heat exchange unit 2A. The tubular body 22c is inserted into the can body 20B sandwiched between the two. The tube body 22c preferably includes a plurality of fins 24b, which are made of, for example, stainless steel having excellent corrosion resistance. The way of water flow in the heat exchanger HT is the same as that of the previous embodiment, and the water supplied from the outside to the water inlet 21a passes through the pipe body 22c of the secondary heat exchange part 2B, It is discharged | emitted from the hot water outlet 21b via the pipe body 22b of the 2nd heat exchange part 2A. The latent heat of the combustion gas can also be recovered by the secondary heat exchange unit 2B having the configuration shown in the present embodiment, and the drain can be efficiently collected by the bottom casing 3 below the combustion gas. Such a configuration can also be employed in the present invention.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the hot water supply apparatus according to the present invention can be varied in design in various ways.

  As the combustor, in place of the fuel oil such as kerosene that is spray-combusted, for example, a fuel oil that is vaporized and then combusted may be used. Can be used. In the case of a gas combustor, it is not necessary to provide oil trapping means in the drain treatment device. The hot water supply apparatus according to the present invention can be configured as a so-called instantaneous hot water heater, as well as a hot water supply apparatus used for other hot water supplies for baths, floor heaters, hot water for snow melting, and the like. it can.

It is sectional drawing which shows an example of the hot water supply apparatus which concerns on this invention. It is II-II sectional drawing of FIG. (a) is a IIIa-IIIa principal part sectional view of Drawing 2, (b) is a IIIb-IIIb principal part sectional view of (a). (A), (b) is sectional drawing which shows the other example of the U-shaped tube with a fin which comprises a secondary heat exchange part. It is principal part sectional drawing of FIG. It is principal part sectional drawing of FIG. It is principal part sectional drawing which shows the other example of the secondary heat exchange part of the hot water supply apparatus which concerns on this invention. (A), (b) is principal part sectional drawing which shows the other example of the drain processing apparatus used in the hot water supply apparatus which concerns on this invention. (A), (b) is principal part sectional drawing which shows the other example of the drain processing apparatus used in the hot water supply apparatus which concerns on this invention. It is sectional drawing which shows the other example of the drain processing apparatus used in the hot water supply apparatus which concerns on this invention. It is principal part sectional drawing which shows the other example of the oil sensor used in the hot water supply apparatus which concerns on this invention. It is principal part sectional drawing which shows the other example of the oil sensor used in the hot water supply apparatus which concerns on this invention. It is principal part sectional drawing which shows the other example of the secondary heat exchange part of the hot water supply apparatus which concerns on this invention.

Explanation of symbols

A1, A2 Hot water supply equipment B1, B2 Drain treatment equipment HT Heat exchanger H1, H2 Freezing prevention heater 1 Combustor 2A Primary heat exchange section (heat exchanger)
2B Secondary heat exchanger (heat exchanger)
3 Bottom casing 4A Separation processing tank (oil capture means)
4B Neutralization treatment tank (neutralization treatment means)
5 Oil sensor 8 Combustion gas flow path 19 Silencer (exhaust duct)
20 Can body 23 U-shaped tube 23a, 23b Opening (U-shaped tube)
23c Tip (U-tube)
23d Straight tube (U-shaped tube)
26 Fins 27a to 27c Convex part 34 Bottom plate part (of bottom casing)
42 Oil adsorption filter (Oil catching means)

Claims (8)

A combustor that burns fuel downward;
A combustion gas flow path that leads to the exhaust port by causing the combustion gas generated by this combustor to proceed downward and then making a U-turn at the bottom and proceeding upward,
A heat exchanger having a water passage tube for performing heat exchange with the combustion gas in a lower region of the combustor;
A hot water supply device comprising:
The heat exchanger is located below the primary heat exchange part for recovering the sensible heat of the combustion gas and the primary heat exchange part, and heat exchange with the primary heat exchange part is finished. A secondary heat exchanging unit that enables latent heat recovery from the combustion gas,
The bottom of the combustion gas flow path is provided with an inclined bottom plate portion that receives a drain that is generated along with the recovery of the latent heat and falls from the secondary heat exchange portion, and that can be collected at a certain location. And
A hot water supply apparatus, characterized in that neutralization processing means for receiving the drain from the bottom plate portion and performing neutralization processing is provided immediately below the bottom plate portion. The combustor is an oil combustor that sprays or vaporizes fuel oil to burn it,
The oil catching means capable of catching oil contained in the drain before or after the drain is supplied to the neutralization processing means is provided below the bottom plate portion. 1. A hot water supply apparatus according to 1.   The hot water supply apparatus according to claim 2, wherein an oil sensor is provided downstream of the oil trapping means in the drain flow direction to detect when oil remains in the drain. A bottom casing having the bottom plate and forming the bottom of the combustion gas flow path;
The hot water supply apparatus according to any one of claims 1 to 3, wherein the secondary heat exchange section is provided in the bottom casing.   The secondary heat exchange part is configured by using a plurality of U-shaped tubes, and each U-shaped tube has a base end portion having a pair of openings for water entry and hot water as a fixed end, and The hot-water supply apparatus of Claim 4 provided so that a front-end | tip part may become the free end or movable support end which accept | permits the displacement to the longitudinal direction of this U-shaped pipe. A combustor that burns fuel downward;
A can placed below the combustor;
A bottom casing located below the can body and connected to the bottom of the can body;
An exhaust duct connected to the bottom casing so as to stand on the bottom casing;
Combustion gas, which is formed in series within the can body, the bottom casing, and the exhaust duct, and that has progressed downward from the fuel combustion region of the combustor into the can body, causes a U-turn in the bottom casing. A combustion gas flow path adapted to enter upward into the exhaust duct,
A heat exchanger having a primary heat exchange section and a secondary heat exchange section for performing heat exchange between the combustion gas and the water passage tube;
A hot water supply device comprising:
The primary heat exchange part is provided in the can body,
The secondary heat exchange section has a plurality of U-shaped tubes provided in the bottom casing, and the plurality of U-shaped tubes have a base end portion having a pair of openings for water entry and hot water. The end portion is a free end or a movable support end that allows displacement in the longitudinal direction of the U-shaped tube.
The bottom casing is provided with an inclined bottom plate portion that can receive the drain generated in the secondary heat exchange portion and collect it at a certain location,
Immediately below the bottom plate portion, neutralization treatment means for receiving the drain from the bottom plate portion and performing neutralization treatment, and included in the drain before or after the drain is supplied to the neutralization treatment means. Oil capturing means capable of capturing
An oil sensor for detecting when oil remains in the drain is provided downstream of the oil trapping means in the drain flow direction. A blower for supplying combustion air from above to below the combustor;
A heater for heating the primary heat exchange part of the heat exchanger to prevent its freezing, and
The air blower is driven when the heater is turned on, so that air heated by using the heater is supplied to the secondary heat exchange unit. The hot water supply apparatus in any one of thru | or 6.   A heater for heating the bottom portion or the vicinity of the bottom portion in which the secondary heat exchange section is provided in the combustion gas flow path is provided, and the air heated by the heater is the primary heat exchange section. The hot-water supply apparatus in any one of Claim 1 thru | or 6 which can be naturally raised toward the direction.

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