JP2011179704A - Combination structure of exhaust top and heat exchanger, and water heating device including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combination structure of a heat exchanger and an exhaust top which can simplify a draining structure of drainage, rainwater intruding from the external, and the like, and reduce manufacturing costs. <P>SOLUTION: A lower part of an exhaust port 23 of the heat exchanger HE receiving a heat transfer tube 4 in a case 2, is defined by an edge part 20a' of a bottom wall 20a of the case 2, the drainage flowing on the bottom wall 20a can flow into an exhaust top 6 after passing through the exhaust port 23 as it is, a flange 28 projecting downward, is formed on the edge part 20a' of the bottom wall 20a or a lower face of the edge part 20a', and the exhaust top 6 is mounted on the case 2 in a state of being partially opposed to the flange 28. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is a combination of a heat exchanger for recovering heat from a gas such as combustion gas and an exhaust top for exhausting the recovered gas discharged from the heat exchanger to a predetermined exhaust location. The present invention relates to a structure and a hot water apparatus such as a hot water supply apparatus having the structure.

  The present applicant has previously proposed those described in Patent Documents 1 and 2 as specific examples of the hot water supply apparatus or its heat exchanger.

  The hot water supply apparatus described in Patent Document 1 includes a heat exchanger in which a heat transfer tube for heat recovery is accommodated in a case into which combustion gas generated using a burner flows, and an exhaust gas attached to the heat exchanger. With a top. The burner and the heat exchanger are accommodated in an outer case for protecting them. The exhaust top serves to guide the exhaust gas after heat recovery discharged from the heat exchanger to the outside of the outer case. Further, in the heat exchanger, strongly acidic drain water (condensed water) is generated with the recovery of latent heat from the combustion gas, and this drain water is provided on the bottom wall portion of the case of the heat exchanger. It is configured to be discharged from the outlet. Therefore, the malfunction that much drain water accumulates in the case of a heat exchanger is avoided appropriately.

  On the other hand, the heat exchanger described in Patent Document 2 has a configuration in which an exhaust member is attached to a front portion of a case that accommodates a heat transfer tube therein, and a front opening portion of the case is closed by the exhaust member. is doing. The exhaust member is made of, for example, a synthetic resin, and has a drain port for drain water in addition to an exhaust port for exhaust gas.

  However, in Patent Documents 1 and 2 described above, there is still room for improvement as described below.

  That is, since the exhaust top of the hot water supply device described in Patent Document 1 guides exhaust gas generated from the heat exchanger to the outside of the outer case and discharges it, a part of the exhaust top is outside the outer case. Is open. Therefore, there is a possibility that water such as rainwater may enter the exhaust top from this opening. For this reason, it is desirable to provide the exhaust top with a drain outlet for discharging the water that has entered the interior. On the other hand, in patent document 1, the discharge port for drain water is provided also in heat exchanger itself. Therefore, in addition to the drain water discharge port provided in the heat exchanger, if the drain port is provided in the exhaust top, two drainage paths are provided in the hot water supply device. This complicates the piping structure of the hot water supply device and increases the manufacturing cost.

On the other hand, in Patent Document 2, in addition to being able to discharge drain water to the outside using a drain port provided in an exhaust member that constitutes a heat exchanger, rainwater can be discharged from an opening of the exhaust member. Even if the liquid enters the heat exchanger, it is possible to discharge the rainwater to the outside using the drain port. However, in Patent Document 2, the exhaust member itself serves as a front wall portion of the case of the heat exchanger, and the rear portion of the exhaust member is a cylinder as means for attaching the exhaust member to the front portion of the case. A method is adopted in which the cylindrical portion is formed as a shape portion and fitted into the front portion of the case. If such a fitting method is adopted, it is necessary to form the rear part of the exhaust member into a cylindrical shape that fits with the front part of the case with high accuracy so that the combustion gas does not leak from the gap of the fitting part. . In this, it is difficult to manufacture the exhaust member at a low cost by, for example, pressing a metal plate. For example, the exhaust member needs to be resin-molded.
Manufacturing costs tend to be expensive.

JP 2007-33000 A JP 2006-349327 A

  The present invention has been conceived under the circumstances as described above, and it simplifies drainage structures such as drain water generated by heat recovery and rainwater entering from the outside, and is inexpensive to manufacture. It is an object of the present invention to provide a combined structure of a heat exchanger and an exhaust top that can be used, and a hot water device having this structure.

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

  In the combined structure of the heat exchanger and the exhaust top provided by the first aspect of the present invention, a heat transfer tube is accommodated in a case in which an air supply port and an exhaust port are formed, and flows into the case. The heat exchange is configured such that the gas heat-recovered by the heat transfer tube passes through the exhaust port, and the case has a bottom wall portion that receives drain water generated by the heat recovery. And the gas that has passed through the exhaust port can be discharged to the outside of the outer case surrounding the heat exchanger, and this water is discharged to the outside when water enters the inside. A heat exchanger and an exhaust top, and the lower portion of the exhaust port is an edge of the bottom wall portion of the case. The drain that has flowed over the bottom wall as defined by Can pass through the exhaust port as it is and flow into the exhaust top, and a flange portion that protrudes downward is formed on the edge of the bottom wall or on the lower surface of the edge. The exhaust top is provided and attached to the case such that a part of the exhaust top faces the flange portion.

  According to such a configuration, when drain water is generated along with heat recovery in the heat exchanger, the drain water is smoothly allowed to flow into the exhaust top from the exhaust port of the heat exchanger to drain the exhaust top. It can be properly discharged from the mouth to the outside. On the other hand, even when rainwater enters the exhaust top from the outside of the exterior case, the rainwater can be appropriately discharged from the drain outlet. Therefore, there is no need to provide two drainage paths for drain water and rainwater, and the piping structure for drainage can be simplified and the manufacturing cost can be reduced. Also, as a means to attach the exhaust top to the heat exchanger case, the flange part provided on the heat exchanger case is used, so a method of fitting the exhaust top and the heat exchanger case is adopted. However, the exhaust top can be easily attached to the heat exchanger by, for example, positioning the exhaust top and the heat exchanger by bringing a part of the exhaust top into contact with the flange portion. There is no need to make the exhaust top made of resin. Therefore, it is possible to further reduce the overall manufacturing cost.

  In a preferred embodiment of the present invention, the flange portion is integrally connected to the bottom wall portion and bent downward from the end edge portion, and from the lower end of the first bent portion. A second bent portion that is bent upward and is superimposed on the first bent portion.

According to such a configuration, since the flange portion has a structure in which the first and second bent portions are overlapped, the thickness of the entire flange portion even if the bottom wall portion is a thin member. Can be increased to increase its rigidity. Therefore, it is possible to increase the attachment strength when the exhaust top is attached to the heat exchanger using this flange portion, and to have excellent attachment reliability. Further, since the flange portion is difficult to be easily deformed, it is preferable to prevent an unfair gap between the flange portion and the exhaust top from causing a condensate or gas leak. . Further, when the bottom wall portion is made of a metal plate, for example, the flange portion can be easily formed by bending a portion of the metal plate, and its manufacture is easy.

  In a preferred embodiment of the present invention, the case has a front wall portion that defines an upper portion of the exhaust port and both side portions in the width direction, and the front wall portion is located above the second bent portion. The exhaust top is formed so as to be integrally connected, and is disposed on the front surface of the flange portion and the front wall portion, and is attached to the case.

  According to such a configuration, since the front wall portion of the case is integrally connected to the second bent portion of the flange portion, for example, when the bottom wall portion of the case is formed of a metal plate, the flange portion In addition, the front wall can be easily formed using the metal plate. Therefore, the manufacturing cost can be further reduced. In addition, if one side of the exhaust top is overlapped with the front wall or the front surface of the flange, the exhaust top is secured and the gas leaks between the exhaust top and the heat exchanger case. It is more preferable to prevent the occurrence of a gap causing the above. In particular, according to the above configuration, it is easy to make the front surface of the flange portion and the front surface of the front wall portion flush with each other, making it difficult to form a gap between the exhaust top and the sealing property. Can be increased.

  The hot water device provided by the second aspect of the present invention includes a gas supply means that is a heat recovery target, a heat exchanger that recovers heat from the gas and performs hot water heating, and is discharged from the heat exchanger. An exhaust top for exhausting the heat-recovered gas to the outside of the outer case surrounding the heat exchanger, wherein the hot water device has a combined structure of the heat exchanger and the exhaust top As described above, a combined structure of the heat exchanger and the exhaust top provided by the first aspect of the present invention is used.

  According to such a configuration, an effect similar to that described for the combined structure of the heat exchanger and the exhaust top provided by the first aspect of the present invention can be obtained.

  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.

It is a schematic front sectional drawing which shows an example of the hot water apparatus provided with the combined structure of the heat exchanger which concerns on this invention, and an exhaust top. It is a partial decomposition | disassembly principal part front view of the hot water apparatus shown in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1. FIG. 2 is a plan sectional view of the heat exchanger shown in FIG. 1. FIG. 2 is an exploded perspective view with partial omission of the combined structure of the heat exchanger and the exhaust top shown in FIG. 1. It is a perspective view which shows an example of the metal plate used for manufacture of the case of the heat exchanger shown in FIG. It is a perspective view which shows an example of the process which manufactures a case from the metal plate shown in FIG. It is a partially broken principal part perspective view which shows the other example of this invention.

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

FIGS. 1-7 has shown an example of the hot water apparatus provided with the combined structure of the heat exchanger and exhaust top to which this invention was applied, and a structure relevant to this.
The hot water device WH of the present embodiment is configured as a hot water supply device, and as shown in FIGS. 1 to 3, the combustor 3, the primary heat exchanger 1, the secondary heat exchanger HE, the exhaust gas. A top case 6 and an outer case 7 for enclosing each component of the hot water device WH and protecting them are provided. The secondary heat exchanger HE corresponds to an example of a heat exchanger to which the present invention is applied.

  The combustor 3 is, for example, a gas burner, and burns fuel gas that is disposed in the burner case 30 and is supplied from the outside via a pipe 32. Combustion air is blown upward from the fan 31 into the burner case 30. The primary heat exchanger 1 is for recovering sensible heat from the combustion gas generated by the combustor 3. For example, a configuration in which a plurality of heat transfer tubes 11 having a plurality of fins 12 are arranged in the case 10. It is.

  The secondary heat exchanger HE is for recovering latent heat from the combustion gas whose sensible heat has been recovered by the primary heat exchanger 1, and is mounted on the upper part of the primary heat exchanger 1. The secondary heat exchanger HE includes a plurality of heat transfer tubes 4, a case 2 that accommodates the plurality of heat transfer tubes 4, a guide member 5 provided in the case 2, and a pair of headers for incoming and outgoing water. 48, 49.

  As shown in FIG. 4, each of the plurality of heat transfer tubes 4 has an elliptical shape in a plan view. Each heat transfer tube 4 includes a plurality of loop portions 40 each having a straight tube portion 40a, 40b extending in the left-right lateral direction of the case 2 and curved tube portions 40c, 40d connected to both ends thereof. It is the structure laminated | stacked through the some clearance gap in the direction. The plurality of heat transfer tubes 4 are arranged in a substantially concentric wrap-around manner in which the sizes of the loop portions 40 are different from each other. The lower end and the upper end of each heat transfer tube 4 are connected to extended tube portions 41, 42 that pass through one of the pair of side wall portions 20 e, 20 f of the case 2, and these extended tube portions 41, 42. Headers 48 and 49 are attached to the outer ends of the. As clearly shown in FIGS. 1 and 2, the outlet 49 a of the header 49 is connected to the inlet 11 a of the heat transfer tube 11 through an appropriate pipe 99. A water supply pipe (not shown) is connected to the water inlet 48 a of the header 48. The water supplied from the water supply pipe to the water inlet 48a is heated by sequentially passing through the plurality of heat transfer pipes 4 and 11, and then supplied from the hot water outlet 11b to a desired hot water supply destination.

  The case 2 has a hollow, substantially rectangular parallelepiped shape, and as a wall portion surrounding the plurality of heat transfer tubes 4, in addition to the pair of side wall portions 20e and 20f described above, as shown in FIG. It has a wall portion 20b, a rear wall portion 20c, and a front wall portion 20d. A flange portion 28 that protrudes downward is integrally connected to the front edge portion 20a ′ of the bottom wall portion 20a. The flange portion 28 is used for mounting the exhaust top 6, and details thereof will be described later.

  An air supply port 21 and an exhaust port 23 are formed in the bottom wall portion 20 a and the front wall portion 20 d of the case 2. The air supply port 21 is a portion for allowing the combustion gas that has traveled upward in the primary heat exchanger 1 to flow into the central space portion of the innermost heat transfer tube 4. An upstanding wall 22 is formed. The standing wall 22 prevents the drain water generated when the latent heat is recovered from the combustion gas from flowing from the heat transfer pipe 4 onto the bottom wall portion 20a and flowing into the air supply port 21. To help.

The guide member 5 is a member for advancing the combustion gas that has entered the case 2 from the air supply port 21 toward the first space portion 24A on the rear side in the case 2 as indicated by an arrow N1. . The guide member 5 is suspended and fixed to the upper wall portion 20b using, for example, a pair of support members 52 (see also FIG. 1). The upper portion 5a of the guide member 5 is separated from the upper wall portion 20b of the case 2, and a gap 25b is formed between the upper portion 5b and the upper wall portion 20b. The gap 25b communicates with a gap 25a formed between the uppermost tube portion 40a ′ of the heat transfer tube 4 and the upper wall portion 20b.

  In this heat exchanger HE, as indicated by the arrow N1, the combustion gas that has traveled to the first space portion 24A subsequently collides with the rear wall portion 20c as indicated by the arrow N2, etc. 2 progresses toward the front side of 2 and flows into the second space 24B on the front side in the case 2 and then passes through the exhaust port 23 as indicated by an arrow N4. In such a process, the combustion gas acts on each part of the plurality of heat transfer tubes 4. As the combustion gas, in addition to the gas passing through both sides of the guide member 5 as indicated by an arrow N3 in FIG. 4, a gas passing through the gaps 25a and 25b as indicated by an arrow N3 'in FIG. 3 is also generated. Therefore, the combustion gas is efficiently applied to the uppermost tube portion 40a 'facing the gap 25a, and heat recovery is effectively performed using the tube portion 40a'. Preferably, the guide member 5 is provided with an inclined portion 5d that causes the combustion gas that has passed through the gap 25b to advance obliquely downward as indicated by an arrow N3 ″ in FIG. 3, and the heat transfer tube existing in the vicinity of the guide member 5 Further, the guide gas 5 is configured so that the combustion gas acts efficiently on the bottom wall portion 20a and the lowermost tube portion 40a "as indicated by an arrow N1 'in FIG. Are provided so as to proceed also to the gap 25c formed between them, and the combustion gas is configured to efficiently act on the tube body portion 40a ″.

  The exhaust port 23 has, for example, a rectangular shape in front view as shown in FIG. However, it is provided near the lower portion of the front wall portion 20d, and the lower portion of the exhaust port 23 is defined by the end edge portion (front end edge portion) 20a ′ of the bottom wall portion 20a. As shown in FIG. 3, the bottom wall portion 20 a is inclined downward so that the drain water on the bottom wall portion 20 a flows toward the exhaust port 23. The upper surface of the end edge portion 20a ′ is flat so that the drain water flowing toward the exhaust port 23 can be passed through the exhaust port 23 without being blocked.

  The flange portion 28 is a portion for attaching the exhaust top 6 to the case 2 while preventing the drain water from interfering with the operation of passing through the exhaust port 23. The flange portion 28 includes first and second bent portions 28a and 28b each having a flat U shape in a side view or a side sectional view. The first bent portion 28a is a portion that is integrally connected to the bottom wall portion 20a and bent downward from the end edge portion 20a ′. The second bent portion 28b is a portion that is bent upward from the lower end of the first bent portion 28a and overlaps with the first bent portion 28a so as to be integrated with the first bent portion 28a. It is connected. Therefore, the entire flange portion 28 is formed integrally with the bottom wall portion 20a.

  The front wall portion 20d is integrally connected to the upper portion of the second bent portion 28b. Accordingly, the front wall portion 20d is integrally connected to the bottom wall portion 20a as well as the flange portion 28. In addition, the front surface of the front wall portion 20d and the front surface of the flange portion 28 are flush with each other without a step.

Of the plurality of wall portions 20 a to 20 f of the case 2, all the wall portions except the upper wall portion 20 b are integrally connected to each other and are also connected to the flange portion 28. This point will be described in more detail. As shown in FIG. 5, the case 2 can be divided into an upper wall portion 20b and a main body portion 29 other than the upper wall portion 20b. The main body 29 is formed, for example, by pressing a single metal plate 29A made of stainless steel, for example, as shown in FIG. In FIG. 7 and FIG. 7 to be described later, the imaginary line indicates a fold line. In addition, portions corresponding to the respective portions of the case 2 illustrated in FIGS. 1 to 5 are denoted by the same reference numerals as those of the respective portions or the reference numerals with “′” added thereto. In the metal plate 29A shown in FIG. 6, when the portion 28a ′ is bent downward along the fold line L1, as shown by the arrow N10, the metal plate 29A takes the form shown in FIG. 7 (however, in FIG. For convenience, it is also shown in a bent state at the position of the folding line L2.) In the form shown in FIG. 7, a first bent portion 28a is formed. Next, when the portion 20d ′ is bent upward along the folding line L2 as indicated by an arrow N11, the front wall portion 20d shown in FIG. 5 is formed. In addition, the second bent portion 28b is also formed, and the formation of the flange portion 28 is completed. The other portions 20c ′, 20e ′, and 20f ′ of FIG. 7 are folded upward along the fold lines L3 to 5 as indicated by arrows N12 to N14, thereby causing the rear wall portion 20c and the pair of side wall portions 20e, 20f is formed.

  As clearly shown in FIG. 3, the exhaust top 6 is for guiding the exhaust gas that has passed through the exhaust port 23 to the outside of the outer case 7, and includes a front side wall portion 61 having a cylindrical portion 60, a rear side wall. It has the latching piece 64 provided in the part 62, the drain outlet 63, and the rear side wall part 62. As shown in FIG. The rear side wall 62 is provided with an opening 65 for allowing the exhaust gas that has passed through the exhaust port 23 to flow into the exhaust top 6. The exhaust gas that has flowed into the exhaust top 6 is contained in the cylindrical portion 60. And is guided to the outside of the outer case 7. When the hot water device WH is installed indoors, for example, an exhaust duct 90 as shown in FIG. 3 is connected to the tubular portion 60, and the exhaust gas is led to the outside via the exhaust duct 90 and discharged. Is done. Of course, in the present invention, it is possible to adopt a configuration in which a member such as the exhaust duct 90 is not connected to the exhaust top 6.

  The locking piece 64 is a portion for locking the lower portion of the exhaust top 6 to the flange portion 28 of the secondary heat exchanger HE, and the lower end portion of the locking piece 64 is joined to the rear side wall portion 62. Yes. The exhaust top 6 is fixedly attached to the case 2 in a state where it is disposed in front of the front wall portion 20d and the flange portion 28 of the case 2, and in this attachment, the upper portion of the locking piece 64 and the rear side wall portion 62 are attached. The lower portion of the flange portion 28 is inserted into the gap formed between the two. The rear side wall 62 of the exhaust top 6 is fixed to the front wall 20d of the case 2 using a screw body 98 such as a bolt or a screw. Preferably, a seal packing (not shown) is interposed in a portion where the exhaust top 6 and the case 2 face each other to achieve an airtight seal.

  The exhaust top 6 is attached so that drain water that has passed through the exhaust port 23 passes through the opening 65 and flows into the interior. The upper end of the second bent portion 28b has a height lower than the end edge portion 20a ′ of the bottom wall portion 20a. This is preferable so that when the drain water passes through the exhaust port 23, the flow of the drain water is not obstructed by the second bent portion 28b. Further, the lower end edge of the opening 65 of the exhaust top 6 is set to a height lower than the upper end of the second bent portion 28b. As a result, the drain water that has passed through the exhaust port 23 passes through the opening 65 and flows into the exhaust top 6 smoothly. The drain port 63 is a part for discharging drain water and other water (including liquid) widely flowing into the exhaust top 6 to the outside of the exhaust top 6. The drain port 63 includes a drain pipe (not shown). Abbreviation) is connected.

  Next, the operation of the hot water device WH will be described.

  Since the exhaust duct 90 allows exhaust gas to be exhausted to the outdoors, rainwater may enter the exhaust duct 90, for example. Rainwater that has entered the exhaust duct 90 may flow into the exhaust top 6 through the exhaust duct 90, but the rainwater is appropriately discharged from the drain outlet 63. On the other hand, in the secondary heat exchanger HE, as described above, drain water is generated along with the recovery of latent heat from the combustion gas, and this drain water is transferred from the plurality of heat transfer tubes 4 to the bottom wall portion 20a of the case 2. And proceed toward the exhaust port 23. Since the lower portion of the exhaust port 23 is defined by the edge 20a ′ having a flat upper surface, the drain water smoothly passes through the exhaust port 23 without being blocked by the edge 20a ′. And flows into the exhaust top 6. Then, this drain water is also appropriately discharged from the drain outlet 63, like the rainwater described above. Therefore, in this hot water device WH, it is not necessary to provide two drainage paths for rain water and drain water, and the configuration of the drainage system can be simplified.

  As a means for attaching the exhaust top 6 to the secondary heat exchanger HE, a system is adopted in which the rear side wall portion 62 of the exhaust top 6 is brought into contact with the front wall portion 20d of the case 2 and the front surface of the flange portion 28. According to such a system, for example, unlike the system in which a part of the exhaust top 6 is fitted to the front part of the case 2 (the system described in Patent Document 2), the shape of the exhaust top 6 is simplified. Is possible. Therefore, it is easy to reduce the manufacturing cost of the exhaust top 6 made of sheet metal, for example. In addition, it is easy to achieve a hermetic seal at a connection portion between the case 2 and the exhaust top 6, and an excellent hermetic seal can be obtained by inserting a seal packing between them. Further, when the exhaust top 6 is fixed to the case 2 using a plurality of screw bodies 98, the screw body 98 may be tightened from the front side of the exhaust top 6, and the workability is also good.

  Since the flange portion 28 has a configuration in which the first and second bent portions 28b are overlapped, the rigidity of the flange portion 28 can be increased even when a relatively thin metal plate 29A is used. It can be increased. Thus, if the rigidity of the flange part 28 is made high, the attachment strength of the exhaust top 6 using this flange part 28 can be made high. Further, for example, even when the exhaust top 6 presses the flange portion 28 with a relatively strong force toward the rear of the secondary heat exchanger HE through the seal packing, the flange portion 28 can be easily deformed rearward. Therefore, the sealing performance between the exhaust top 6 and the flange portion 28 can be improved. In the present embodiment, the alignment of the exhaust top 6 and the case 2 can be performed by locking the flange portion 28 to the locking piece 64 of the exhaust top 6. There is also an advantage that the workability is improved. In the case 2 of the secondary heat exchanger HE, the portions other than the upper wall portion 20b are manufactured by bending a single metal plate 29A as described with reference to FIGS. The production cost of the secondary heat exchanger HE can also be reduced.

  In addition, in this embodiment, although the guide member 5 is arrange | positioned in the center part of the heat transfer tube 4 of planar view ellipse, this center part is a part which can become dead space originally. Therefore, it is excellent in space efficiency when the guide member 5 is incorporated in the case 2 and is preferable in reducing the overall size of the secondary heat exchanger HE. Further, as described above, the primary heat exchanger 1 and the secondary heat exchanger HE are connected by overlapping their cases 10 and 7 directly in the vertical direction. Moreover, the combustion gas recovered by the primary heat exchanger 1 is configured to flow as it is from the case 10 into the guide member 5. Therefore, the total height of the two heat exchangers 1 and HE can be reduced, and a dedicated member for guiding the combustion gas from the primary heat exchanger 1 to the secondary heat exchanger HE needs to be used separately. In addition, the overall configuration of the hot water device WH can be simplified.

  FIG. 8 shows another embodiment of the present invention. In the present embodiment, the front wall portion 20d of the case 2 of the secondary heat exchanger is integrally connected to the bottom wall portion 20a, but the flange portion 28A is a member 280 that is separate from the bottom wall portion 20a. It is comprised using. The member 280 has an L-shaped cross-sectional shape, and a part of the member 280 is welded or brazed to the end edge portion 20a ′ of the bottom wall portion 20a and the lower surface portion in the vicinity thereof. Thus, the other part of the member 280 is a flange portion 28A that protrudes downward from the lower surface of the bottom wall portion 20a. In this embodiment, although the method of forming the flange portion 28A is different from that of the flange portion 28 described above, the role played by the flange portion 28A is the same as that of the flange portion 28 described above, and the intended effect of the present invention is obtained. be able to. As understood from the present embodiment, the flange portion referred to in the present invention can be configured using a member separate from the bottom wall portion of the case.

  The present invention is not limited to the contents of the above-described embodiment. Various changes can be made to the design of the combined structure of the heat exchanger and the exhaust top according to the present invention and the specific configuration of each part of the hot water apparatus having the combined structure.

  For example, as a heat exchanger tube of a heat exchanger, instead of an elliptical tube in plan view, a spiral tube having a different shape from this, or a straight tube other than a spiral tube, a meandering tube, a bellows shape Various tube bodies such as the tube body can be used. Of course, as a heat exchanger, it can be set as the structure which does not use the guide member 5 of the said embodiment. It is also possible to adopt a so-called single can multiple circuit system in which a plurality of sets of heat transfer tubes are incorporated in one case. The exhaust port provided in the case only needs to be provided so that the lower part thereof is defined by the edge of the bottom wall portion of the case and allows the drain water to flow into the exhaust top. Any shape or size is acceptable. The exhaust port is not necessarily provided so as to open toward the front of the hot water apparatus, and may be provided so as to open toward the back side of the hot water apparatus, for example. The front wall part of the case of the heat exchanger referred to in the present invention does not mean a wall part facing the front of the hot water apparatus, but means a wall part provided with an exhaust port.

  The flange portion provided in the case of the heat exchanger may be in a form protruding downward from the end edge portion of the bottom wall portion of the case or the lower surface of the end edge portion, and the size thereof is not limited. However, the width of the flange portion (for example, the width in the left-right direction in front view as shown in FIG. 2) is preferably larger than the width of the lower portion of the exhaust port. The flange portion is preferably provided with means corresponding to the locking piece 64 of the above embodiment, but such means can also be omitted. The flange part should just be utilized as a part for making at least one part of an exhaust top oppose at the time of attachment of the exhaust top with respect to a heat exchanger. The exhaust top in the present invention means a part or member for guiding and exhausting the gas that has passed through the exhaust port of the heat exchanger to the outside of the outer case surrounding the heat exchanger, and its specific shape, etc. Is not limited.

  The hot water device as used in the present invention means a device having a function of generating hot water, and is used for various types of hot water supply devices for general hot water supply, bath hot water supply, heating, snow melting, and the like, and hot water supply. It is a concept that includes a wide range of equipment for producing hot water. As the gas to be heat-recovered, for example, exhaust gas from a cogeneration gas engine or a fuel cell can be used other than the combustion gas.

WH Hot water device HE Secondary heat exchanger (heat exchanger)
2 Case (for heat exchanger)
3 Combustor (gas supply means for heat recovery)
4 Heat transfer tube 6 Exhaust top 7 Exterior case 20a Bottom wall (case)
20a 'edge 20d front wall (case)
21 Air supply port 23 Exhaust port 28, 28A Flange part 63 Drain port

Claims (4)

A heat transfer tube is accommodated in a case in which an air supply port and an exhaust port are formed, and the gas that has flowed into the case and has been heat-recovered by the heat transfer tube passes through the exhaust port. And the case has a heat exchanger having a bottom wall portion that receives drain water generated along with the heat recovery, and
The gas that has passed through the exhaust port can be led out to the outside of the outer case surrounding the heat exchanger, and this water can be discharged to the outside when water enters the inside. An exhaust top having a drain;
A combined structure of a heat exchanger and an exhaust top,
The lower portion of the exhaust port is defined by the edge of the bottom wall portion of the case, and drain water flowing on the bottom wall portion passes through the exhaust port as it is and flows into the exhaust top. Formed possible,
On the edge of the bottom wall or the lower surface of the edge, a flange projecting downward is provided,
A combined structure of a heat exchanger and an exhaust top, wherein the exhaust top is attached to the case so that a part of the exhaust top faces the flange portion.   The flange portion is integrally connected to the bottom wall portion and bent downward from the edge portion, and the first bent portion is bent upward from the lower end of the first bent portion. The combined structure of a heat exchanger and an exhaust top according to claim 1, further comprising a second bent portion superimposed on the portion. The case has an upper portion of the exhaust port and a front wall portion that defines both sides in the width direction, and the front wall portion is integrally connected to the upper portion of the second bent portion,
The combined structure of the heat exchanger and the exhaust top according to claim 2, wherein the exhaust top is disposed so as to face the front surfaces of the flange portion and the front wall portion and is attached to the case. Gas supply means for heat recovery;
A heat exchanger that performs heat recovery from the gas to perform hot water heating;
An exhaust top for exhausting the gas after heat recovery discharged from this heat exchanger to the outside of the outer case surrounding the heat exchanger;
A hot water device comprising:
4. A hot water apparatus, wherein the combined structure of the heat exchanger and the exhaust top according to claim 1 is used as a combined structure of the heat exchanger and the exhaust top.

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