JP5467037B2 - Latent heat exchanger and hot water supply device - Google Patents

Description

  The present invention relates to a latent heat exchanger that condenses water vapor in combustion exhaust and recovers latent heat, and a hot water supply apparatus having the latent heat exchanger.

  Conventionally, a so-called condensing type hot water supply apparatus having a sensible heat exchanger and a latent heat exchanger in a main body is known. In this type of water heater, after the sensible heat of the combustion exhaust is absorbed by the sensible heat exchanger, the latent heat of the combustion exhaust is further absorbed by the latent heat exchanger. As the latent heat exchanger, in order to reduce the size and increase the thermal efficiency, for example, as shown in FIGS. 13 and 15, a linear portion and an arcuate folded portion are repeatedly formed in a casing through which combustion exhaust flows. A plurality of endothermic pipes 820, 920 having a continuous piping structure are arranged in a meandering state or a spiral state, and inflows provided on one side walls 814, 914 of the casing in order to circulate a fluid to be heated to each endothermic pipe 820, 920. The headers 830 and 930 and the outflow headers 840 and 940 have been proposed in which the upstream ends and the downstream ends of the heat absorption pipes 820 and 920 are respectively connected (for example, Patent Document 1 and Patent Document 2).

JP 2009-180398 A

JP 2008-292032 A

  By the way, when the latent heat of the combustion exhaust is absorbed by the latent heat exchanger, the water vapor in the combustion exhaust is cooled below the dew point, and the contained water vapor is condensed, so that strongly acidic drain is generated in the casing. Therefore, in order to prevent corrosion due to drain, corrosion-resistant metal members such as stainless steel and titanium are used for the casing and the heat absorption pipe, and in order to drain the drain from the casing at an early stage, A drain discharge port is provided below the casing where the water drops.

  However, in assembling the latent heat exchanger of Patent Document 1, as shown in FIG. 14, an upper case 812 having an upper projecting portion 812a projecting downward from the four corners and an upper portion from the four corners. A lower case 813 having a lower projecting portion 813a projecting so as to extend in a cylindrical manner having both side openings by welding so that the upper projecting portion 812a and the lower projecting portion 813a contact each other First, the casing body 811 is manufactured, and then, as shown in FIG. 13, the peripheral edges of the opening portions on both sides of the casing body 811 are connected to one side wall 814 and the other side wall 815 in which the upstream end and the downstream end of the heat absorption pipe 820 are brazed. Each is welded. In the latent heat exchanger disclosed in Patent Document 2, as shown in FIG. 16, the casing includes a body member 911 having a concave cross section that forms a front wall 911 a, a back wall 911 b, and a bottom wall 911 c, and a pair of side walls. It is manufactured by joining 913, 914 and the top plate member 915 by brazing.

  Therefore, in the latent heat exchanger having the casing as described above, when the drain dripped from the heat absorption tube proceeds to the corner below the casing, the peripheral edges of the opening portions on both sides of the casing body and the body member joined by welding or brazing. There is a risk that the drain will easily enter the gap between the joint portion and the side wall, and the strongly acidic drain may stay in the gap for a long period of time. In addition, when metal plates are joined by welding, there is a possibility that the metal plate has deteriorated at the welding location, and even if a metal plate with excellent corrosion resistance is used, In some cases, the corrosion resistance is partially degraded. Therefore, there exists a problem that a metal plate tends to corrode under the both sides of the casing where drain tends to stay. Furthermore, in the latent heat exchanger manufactured by joining a large number of metal plates as described above by welding or brazing, the number of parts increases and the number of joints increases, which complicates the installation work. There is also a problem.

  The present invention has been made in order to solve the above-mentioned problems, and the object of the present invention is to reduce corrosion due to drain in a latent heat exchanger that is required to be downsized and have high thermal efficiency, and has excellent durability. An object of the present invention is to provide a latent heat exchanger that can be easily manufactured and to provide a hot water supply apparatus using the latent heat exchanger.

According to the present invention, a casing having a combustion exhaust passage therein, a heat sink pipe accommodated in the casing, an inflow header for introducing a fluid to be heated into the heat sink pipe, and a fluid to be heated from the heat sink pipe A latent heat exchanger with an outflow header to be derived,
The casing has a box-shaped casing body having an upper opening, and a top plate for closing the upper opening of the casing body.
The casing body includes a rear wall, a front wall, a bottom wall having a drain outlet, an upstream end insertion hole through which the upstream end of the heat absorption pipe is inserted, and a downstream end insertion through which the downstream end of the heat absorption pipe is inserted. Having one side wall having a hole and the other side wall;
The back wall, the front wall, the bottom wall, the one side wall, and the other side wall are respectively drawn from a front and rear side edge of the bottom wall by drawing a single metal plate. The wall stands up via the corner R portion, and the one side wall and the other side wall stand up from the left and right side edge portions of the bottom wall via the corner R portion, and the left and right side edges of the back wall and the front wall. The one side wall and the other side wall are respectively integrally molded from the part via a corner R part ,
The inflow header and the outflow header are respectively arranged outside the one side wall, and upstream of the heat absorption pipe led out to the outside of the one side wall through the upstream end insertion hole and the downstream end insertion hole. And a latent heat exchanger connected to the downstream end.

  According to the latent heat exchanger, the casing body having the back wall, the front wall, the bottom wall, the one side wall, and the other side wall is integrally formed by drawing a single metal plate. There is no need to perform welding or brazing for assembly. In addition, since there is no joint by welding or brazing under the casing, even if drain is generated, the retention of drain under the casing is reduced, and the drain can be smoothly discharged from the drain outlet provided in the bottom wall. It can be discharged out of the casing. Furthermore, since the casing body is integrally formed with the back wall, the front wall, the bottom wall, the one side wall, and the other side wall, the casing can be easily manufactured with a small number of parts.

  In the latent heat exchanger, the casing body and the top plate may be joined by caulking.

  In the above casing, the casing main body is integrally formed by drawing a single metal plate, and only the upper opening of the casing main body, which is less affected by drainage, needs to be closed by the top plate. By simply joining the casing body and the top plate, a casing having excellent corrosion resistance can be produced.

Preferably, the latent heat exchanger includes a linear portion extending between the one side wall and the other side wall, and an arcuate folding located at both ends of the one side wall side and the other side wall side in the casing. An endothermic tube having a piping structure in which a portion is continuously repeated;
A flat side rectifying plate is provided between the arcuate folded portion on the other side wall side of the endothermic tube and the inner surface of the other side wall.

  In the latent heat exchanger, since the casing body integrally formed by drawing is used, in order to connect the heat sink pipe and the inflow header and the outflow header arranged outside the one side wall, the heat sink pipe is connected from the one side wall. It is necessary to lead out the upstream end and the downstream end. Therefore, when the upstream end and the downstream end of the endothermic tube are respectively inserted into the upstream end insertion hole and the downstream end insertion hole of the one side wall, the arcuate folded portion on the other side wall side of the endothermic tube and the inner surface of the other side wall are provided. A certain amount of space will be created. As a result, the combustion exhaust gas introduced from the exhaust inlet flows into the space with less resistance, and the combustion exhaust gas does not efficiently contact the heat absorption pipe, which may reduce the thermal efficiency. On the other hand, if a flat side rectifying plate is provided in the space between the arcuate folded portion on the other side wall side of the endothermic tube and the inner surface of the other side wall as described above, the combustion exhaust comes into contact with the endothermic tube. It becomes easy and can improve thermal efficiency.

  In the latent heat exchanger, when the back wall and the front wall have an exhaust inlet and an exhaust outlet, respectively, the side rectifier plate absorbs the heat absorption from both ends of the exhaust inlet side and the exhaust outlet side. You may have the inclined surface which inclines toward the pipe side.

  In the latent heat exchanger, a combustion exhaust passage is formed between the exhaust inlet on the rear wall and the exhaust outlet on the front wall. If the side rectifying plate has inclined surfaces that are inclined toward the heat absorption tube side on the exhaust inlet side and the exhaust outlet side, the combustion exhaust flows along the inclined surface. It becomes easy to contact and heat efficiency can be raised further.

In the latent heat exchanger,
It is preferable that an upper end of the side rectifying plate is joined to a lower surface of the top plate, and a lower end of the side rectifying plate is not in contact with the bottom wall.

  According to the latent heat exchanger, the casing can be assembled in a state where the side rectifying plate is disposed at a predetermined position by simply closing the upper opening of the casing body with the top plate to which the side rectifying plate is joined. it can. Further, if the side rectifying plate is extended so as to contact the bottom wall, when the combustion exhaust gas passes through the casing, the vibration of the side rectifying plate is transmitted to both the top plate and the bottom wall, and noise is generated. Likely to happen. On the other hand, if the side rectifying plate is in contact with only the lower surface of the top plate and is not in contact with the bottom wall, such noise can be prevented. In addition, the drain flow is not obstructed, and the drain can be discharged smoothly, and since no joint is formed between the bottom wall and the side rectifying plate, there is no need to worry about crevice corrosion due to the drain.

  And according to this invention, the hot-water supply apparatus which has a latent-heat exchanger as described above is provided.

  As described above, according to the present invention, since a joint portion by welding or brazing is not formed below the casing of the latent heat exchanger, the drain hardly stays below the casing. Therefore, the drain can be discharged smoothly from the drain outlet provided below the casing. As a result, corrosion of the metal plate due to drain can be suppressed, and a latent heat exchanger and a hot water supply device excellent in durability can be provided. Moreover, since the said casing can be produced by obstruct | occluding the upper opening part of the casing main body integrally molded by the drawing process with a top plate, a latent heat exchanger can be easily manufactured with a small number of parts.

FIG. 1 is a schematic perspective view showing an example of a latent heat exchanger according to Embodiment 1 of the present invention. FIG. 2 is a schematic exploded perspective view of FIG. FIG. 3 is a partial schematic cross-sectional view showing the internal structure of the other side wall side of the latent heat exchanger according to Embodiment 1 of the present invention. FIG. 4 is a schematic perspective view showing a side rectifying plate according to Embodiment 1 of the present invention. FIG. 5 is a schematic perspective view showing the heat absorption tube according to Embodiment 1 of the present invention. FIG. 6 is a schematic cross-sectional view showing an arcuate folded portion of the heat absorption tube according to Embodiment 1 of the present invention. FIG. 7 is a schematic cross-sectional view showing a straight portion of the heat absorption tube according to Embodiment 1 of the present invention. FIG. 8 is a schematic cross-sectional view showing a cut surface taken along the line AA of FIG. FIG. 9 is a partial schematic cross-sectional view showing a process of joining the casing body and the top plate according to Embodiment 1 of the present invention by caulking, and FIG. 9 (A) shows the state before joining, and FIG. 9 (B). Indicates after bonding. FIG. 10 is a schematic configuration diagram illustrating an example of a hot water supply apparatus according to Embodiment 1 of the present invention. FIG. 11 is a schematic perspective view showing an example of a latent heat exchanger according to Embodiment 2 of the present invention. FIG. 12 is a schematic configuration diagram illustrating an example of a hot water supply apparatus according to Embodiment 2 of the present invention. FIG. 13 is a schematic perspective view showing an embodiment of a conventional latent heat exchanger. FIG. 14 is a schematic perspective view showing the casing body of FIG. FIG. 15 is a schematic plan sectional view showing another embodiment of a conventional latent heat exchanger. FIG. 16 is a schematic perspective view showing the casing of FIG.

(Embodiment 1)
Hereinafter, the latent heat exchanger of the present embodiment and the hot water supply apparatus having the latent heat exchanger will be specifically described.

  1 is a schematic perspective view showing an example of a latent heat exchanger according to Embodiment 1 of the present invention, and FIG. 2 is a schematic exploded perspective view of FIG.

  As shown in FIGS. 1 and 2, the casing 2 of the latent heat exchanger 1 according to the present embodiment includes a box-shaped casing body 10 having an upper opening 16 and the upper opening 16 of the casing body 10 closed. And the top plate 40 to be used. Each of the casing body 10 and the top plate 40 is formed from a single thin plate made of a metal having corrosion resistance such as stainless steel.

  The casing body 10 has a back wall 11, a front wall 12, a bottom wall 13, one side wall 14, and the other side wall 15, and a box having an upper opening 16 by drawing a single metal plate. Are integrally molded. This will be described in more detail. The back wall 11 and the front wall 12 are erected from the front and rear side edges of the flat bottom wall 13 extending in a certain direction, and these are connected together via a corner portion. One side wall 14 and the other side wall 15 are erected from both left and right edge portions of the wall 13, and these are integrally connected via a corner portion. Furthermore, the left and right side edge portions of the back wall 11 and the front wall 12 are integrally connected to the one side wall 14 and the other side wall 15 via a corner portion, respectively. As a result, an inner space having an upper opening 16 surrounded by the back wall 11, the front wall 12, the bottom wall 13, and the side walls 14 and 15 is formed in the casing body 10. In the present embodiment, the top plate 40 is placed on the open ends of the back wall 11, the front wall 12, and the side walls 14 and 15 when the casing body 10 and the top plate 40 are joined by caulking. The mounting portion 101 in which the walls 11, 12, 14, 15 are bent in the horizontal direction, and the upper flange portion 102 is bent upward from the mounting portion 101 for caulking the top plate 40 by caulking. Are connected to each other.

  Therefore, when manufacturing the casing body 10 of the present embodiment, there is no need to perform welding work or brazing work. In addition, since a joint portion by welding or brazing is not formed below the casing 2 having the casing body 10, even if drain is generated, retention of the drain below the casing 2 can be reduced. Furthermore, since the back wall 11, the front wall 12, the bottom wall 13, the one side wall 14, and the other side wall 15 are integrally formed by drawing, the casing 2 can be easily manufactured with a small number of parts.

  When the latent heat exchanger 1 is attached to the appliance main body of the hot water supply device, the exhaust inlet 111 into which the combustion exhaust gas is introduced and the combustion exhaust gas are led out at the upper, lower, left, and right substantially central portions of the back wall 11 and the front wall 12, respectively. The exhaust outlet 121 is formed in a horizontally long rectangular shape. As a result, a combustion exhaust passage is formed in the casing 2 to communicate the exhaust outlet 121 to the exhaust outlet 121. In addition, the shape and opening location of the exhaust inlet 111 and the exhaust outlet 121 may be appropriately changed according to the usage pattern. For example, the exhaust inlet 111 may be formed in the bottom wall 13 and the exhaust outlet 121 may be formed in the top plate 40 according to the usage pattern of the hot water supply device.

  The bottom wall 13 is inclined downward from the back wall 11 side toward the front wall 12 side in order to smoothly drain the drain to the outside of the casing 2 when the drain is generated, and the drain wall is located at the lowest position of the slope. A drain outlet 17 is provided for discharging water. The drain outlet 17 is connected to a neutralizer through a drain discharge pipe. Further, when the casing body 10 and the top plate 40 are joined to the bottom wall 13, the bottom wall 13 projects toward the inside of the casing 2 at both ends in the left-right direction (both ends on the one side wall 14 side and the other side wall 15 side). Lower protrusions 131 and 131 are formed by drawing. As will be described later, the lower protrusion 131 is provided at a position where it comes into contact with the arcuate folded portion 52 of the endothermic tube 50 located at the lowermost stage.

  On the other hand, the upstream end insertion hole 141 through which the upstream end 53 of the heat absorption tube 50 is inserted and the downstream end 54 of the heat absorption tube 50 are inserted into both ends of the side wall 14 in the front-rear direction (both ends on the back wall 11 side and the front wall 12 side). The downstream end insertion holes 142 are formed by burring as many as the number of the heat absorption tubes 50. In the present embodiment, the upstream end insertion holes 141 and the downstream end insertion holes 142 are each arranged in two rows and in a staggered manner. The number and arrangement of the insertion holes 141 and 142 are appropriately selected according to the number of the heat absorption tubes 50. The other side wall 15 is the same as the one side wall 14 except that the upstream end insertion hole 141 and the downstream end insertion hole 142 are not formed.

  The top plate 40 includes a flat top plate main body 41, an upright piece 42 in which the periphery of the top plate main body 41 is bent upward over the entire circumference, and the upright piece 42 is horizontally extended over the whole circumference. And a lower flange portion 43 folded back in the direction. Similar to the casing body 10, the top plate 40 is formed by drawing a single metal plate. The upright piece 42 is formed to have a size that fits in the inner periphery of the upper opening 16 surrounded by the back wall 11, the front wall 12, the one side wall 14, and the other side wall 15 of the casing body 10. The flange portion 43 is formed in a size to be placed on the placement portion 101. Further, when the casing body 10 and the top board 40 are joined to the top plate main body portion 41, both ends in the left-right direction (both ends on the one side wall 14 side and the other side wall 15 side) face toward the inside of the casing 2. The protruding upper protruding portions 144 and 144 are formed by drawing. As will be described later, the upper protruding portion 144 is provided at a position where the upper protruding portion 144 abuts on the arcuate folded portion 52 of the heat absorption tube 50 located at the uppermost stage.

  As shown in FIGS. 3 and 4, when the casing body 10 and the top plate 40 are joined to the lower surface on the other side wall 15 side of the top plate 40, the top plate 40 extends in the combustion exhaust passage direction in the casing 2. The upper ends of the flat side rectifying plates 45 are joined by welding. That is, in the latent heat exchanger 1 of the present embodiment, since the casing body 10 integrally formed by drawing is used, the heat sink pipe 50 and the inflow header 60 and the outflow header 70 disposed outside the one side wall 14 In order to connect the two, it is necessary to lead out the upstream end 53 and the downstream end 54 of the heat absorption pipe 50 from the one side wall 14. Therefore, when the upstream end 53 and the downstream end 54 of the heat absorption pipe 50 are respectively inserted into the upstream end insertion hole 141 and the downstream end insertion hole 142 of the one side wall 14, the end of the arcuate folded portion 52 on the other side wall 15 side A space of a certain size is generated between the other side wall 15 and the inner surface. As a result, the combustion exhaust gas introduced from the exhaust inlet 111 flows into the space with less resistance, and the combustion exhaust gas does not efficiently contact the heat absorption pipe 50, which may reduce the thermal efficiency. However, if the side rectifying plate 45 is provided in the space between the end of the arcuate folded portion 52 on the side of the other side wall 15 and the inner surface of the other side wall 15 as described above, the side rectifying plate 45 causes combustion exhaust to be discharged. Since it flows to the endothermic tube 50 side, the combustion exhaust easily comes into contact with the endothermic tube 50, and the thermal efficiency can be improved. If the upper end of the side rectifying plate 45 is joined to the lower surface of the top plate 40, the casing 2 can be simply closed by closing the upper opening 16 of the casing body 10 with the top plate 40 to which the side rectifying plate 45 is joined. Can be assembled.

  Further, as shown in FIG. 4, the side rectifying plate 45 of the present embodiment includes a flat plate portion 451 having a joint portion 450 for joining the lower surface of the top plate 40 at the upper end, the exhaust inlet 111 side, and the exhaust outlet. It is formed from inclined surfaces 452 and 452 which are inclined so as to be bent from both ends on the 121 side toward the endothermic tube 50 side. Thereby, the combustion exhaust introduced into the casing 2 from the exhaust inlet 111 flows along the inclined surfaces 452 and 452 on the exhaust inlet 111 side and the exhaust outlet 121 side, so that the combustion exhaust easily comes into contact with the heat absorption pipe 50, Furthermore, thermal efficiency can be improved. The inclined surfaces 452 and 452 may be formed in a linear shape.

  Further, as shown in FIG. 3, the side rectifying plate 45 is provided such that the lower end thereof does not contact the bottom wall 13. If the side rectifying plate 45 extends so as to contact the bottom wall 13, the vibration of the side rectifying plate 45 is transmitted to both the top plate 40 and the bottom wall 13 when the combustion exhaust gas passes through the casing 2. And is prone to noise. However, if the side rectifying plate 45 is in contact with only the lower surface of the top plate 40 and is not in contact with the bottom wall 13, such noise can be prevented. Further, the drain flow is not obstructed, and the drain can be discharged smoothly, and since no joint is formed between the bottom wall 13 and the side rectifying plate 45, there is no need to worry about crevice corrosion due to the drain.

  Returning to FIG. 2, the top plate 40 is joined with an upper rectifying plate 46 that is inclined downward from the lower surface of the top plate 40 on the front wall 12 side toward the entire upper edge of the opening of the exhaust outlet 121. As a result, the combustion exhaust introduced from the exhaust inlet 111 is pressed down toward the endothermic tube 50 from above, making it easier for the combustion exhaust to come into contact with the endothermic tube 50, and the combustion exhaust on the exhaust outlet 121 side to It becomes easy to discharge | emit smoothly from the exhaust outlet 121 along.

  In the casing 2, a plurality of heat absorption pipes 50 (five in the present embodiment) through which tap water as a fluid to be heated flows are accommodated in a meandering state with a gap enough to allow combustion exhaust to pass through. . The upstream end 53 and the downstream end 54 of each of the heat absorption tubes 50 are led out to the outside of the one side wall 14 from the upstream end insertion hole 141 and the downstream end insertion hole 142 of the one side wall 14 described above.

  FIG. 5 is a schematic perspective view showing one of the plurality of heat absorption tubes 50. The endothermic tube 50 of the present embodiment is bent at a plurality of locations on a corrugated tube (a tube having an outer surface shape in which valleys and peaks are alternately continuous in the axial direction) made of a metal having corrosion resistance such as stainless steel. In addition, the linear portion 51 and the arcuate folded portion 52 have a repeated piping structure, and the linear portion 51 and the arcuate folded portion 52 have a waveform shape meandering in one plane. However, in FIG. 1, FIG. 2, etc., in order to avoid complication, only a part of the straight part 51 is represented by a corrugated tube. Each endothermic tube 50 has a straight portion 51 extending in the left-right direction between the one side wall 14 and the other side wall 15, and an arcuate folded portion at both ends in the left-right direction (both ends on the one side wall 14 side and the other side wall 15 side). It is accommodated in the casing 2 so that 52 is located. Note that a plurality of heat absorption tubes 50 in which the straight portion 51 and the arcuate folded portion 52 are connected may be used, and these heat absorption tubes 50 may be arranged in the casing 2 in a spiral state.

  As shown in FIGS. 5 and 6, the arcuate folded portion 52 of the endothermic tube 50 has a flat cross-sectional shape that is flattened in the direction in which the endothermic tubes 50 are overlapped. FIG. 6 shows a shape obtained by cutting the valley portion of the endothermic tube 50. On the other hand, as shown in FIG. 7, the trough portion of the straight portion 51 of the endothermic tube 50 has a circular cross section.

  As shown in FIG.2 and FIG.3, each heat absorption pipe | tube 50 is piled up by the circular arc-shaped folding | returning part 52 processed into flat. As a result, the distance between adjacent heat absorption tubes 50 can be reduced in the direction in which the heat absorption tubes 50 are overlapped, the heat absorption tubes 50 are densely arranged, the latent heat exchanger 1 can be downsized, and combustion exhaust can be reduced. The heat absorption tube 50 can make contact efficiently.

  Further, the heat absorption tubes 50 to be overlapped are shifted by a half pitch in the wavelength direction of the waveform to be bent. That is, in FIG. 2, the endothermic pipes 50 adjacent to the second stage from the top and the second stage from the bottom are shifted by a half pitch in the upstream direction of the combustion exhaust (on the exhaust inlet 111 side). Is provided.

  Further, the flattened arcuate folded portion 52 of the uppermost heat absorption tube 50 and the lowermost heat absorption tube 50 are flattened at both ends in the left-right direction (both ends on the one side wall 14 side and the other side wall 15 side). Each of the arcuate folded portions 52 is in contact with the upper projecting portion 144 provided on the top plate 40 and the lower projecting portion 131 provided on the bottom wall 13. As a result, the endothermic tube 50 can be stably fixed in the casing 2 without using a separate member for fixing the endothermic tube 50. Further, vibration of the heat absorption tube 50 due to a water hammer phenomenon or the like can be suppressed. Furthermore, since no separate member other than the heat absorption pipe 50 is disposed in the combustion exhaust passage to fix the heat absorption pipe 50, the combustion exhaust can be brought into contact with the heat absorption pipe 50 efficiently.

  As described above, the upstream end 53 and the downstream end 54 of the heat absorption pipe 50 pass through the upstream end insertion hole 141 and the downstream end insertion hole 142 formed in the one side wall 14 of the casing body 10, respectively. As shown in FIG. 1, the upstream end 53 and the downstream end 54 are connected to an inflow header 60 and an outflow header 70 arranged outside the side wall 14, respectively. Thus, the upstream end 53 and the downstream end 54 of each heat absorption pipe 50 are connected to the inflow header 60 and the outflow header 70, respectively, and connected in parallel as a whole, whereby the heat absorption pipe 50 is connected in series. Compared to, water resistance is reduced.

  The inflow header 60 and the outflow header 70 to which the upstream end 53 and the downstream end 54 of the heat absorption pipe 50 are respectively connected are disposed outside the one side wall 14 of the casing body 10. As shown in FIG. 1, FIG. 2, and FIG. 8, which shows a cut surface taken along the line AA in FIG. 1, these two headers 60, 70 are composed of vessel-shaped header bodies 61, 71 and header bodies 61, 71. And are fitted by brazing so that the header bodies 61 and 71 and the opening portions of the header lid bodies 64 and 74 are opposed to each other. Is formed. Note that the outflow header 70 of the present embodiment has the same configuration as the inflow header 60 except that a header lid 74 is used in which the header lid 64 of the inflow header 60 is turned upside down. For this reason, in the following, the inflow header 60 will be mainly described as an example.

  As often shown in FIG. 8, the header body 61 is fitted with a body bottom plate 62 in which a connection hole 160 to which the upstream end 53 of the heat absorption pipe 50 is connected, a header body 61 and a header lid body 64. When assembled, the main body bottom plate 62 has a main body peripheral wall 63 that stands from the periphery of the main body bottom plate 62 toward the header cover body 64 and opens to the header cover body 64 side. In the present embodiment, the inflow header 60 and the outflow header 70 are both provided close to the side wall 14, but either the upstream end 53 or the downstream end 54 of the heat absorption pipe 50 is connected to the casing 2. Further, the upstream end 53 or the downstream end 54 of the extended heat absorption pipe 50 may be connected to the inflow header 60 or the outflow header 70.

  The main body peripheral wall 63 of the header main body 61 is such that at least a part of the main body open end 630 is higher than the outer peripheral surface of the cover bottom plate 65 in the cross-sectional direction when the header cover 64 is fitted to the header main body 61. It is extended to. Further, as shown in FIG. 2, the main body peripheral wall 63 of the header main body 61 is formed in a substantially rectangular shape having a pair of long side portions 63a and a pair of short side portions 63b. Furthermore, as shown in FIG. 8, the main body open ends 630 of the long side portion 63a and the short side portion 63b are formed so as to spread outward. Thereby, when brazing the header main body 61 and the header lid body 64, a brazing reservoir M is formed between the inner surface of the main body peripheral wall 63 and the outer surface of the lid peripheral wall 66. As a result, not only can the joint area to be brazed between the inner surface of the main body peripheral wall 63 and the outer surface of the cover peripheral wall 66 be increased, but also the brazing material spreads in the brazing pool portion M, so Compared to the case where the brazing material is applied only to the end face, it is possible to prevent the brazing material from adhering to unnecessary portions in the brazing process.

  Further, when the header main body 61 and the header lid 64 are fitted to the main body open ends 630 of the opposing long side portions 63a of the header main body 61 of the present embodiment, they are bent toward the header lid 64. Claw portions 67, 67 to be formed are formed. These claw portions 67 and 67 are formed so as not to overlap in the direction of the short side portion 63b. That is, in the present embodiment, the header body 61 and the header lid body 64 fitted in the header body 61 in an internally fitted state are brazed, so the header lid body 64 is press-fitted into the header body 61 before brazing. It is necessary to let However, since the peripheral walls 63 and 66 of the header body 61 and the header lid body 64 have manufacturing errors, the header lid body 64 is displaced from the header body 61 after press-fitting, or the header lid body 64 is displaced from the header body 61. May come off. For this reason, after the header lid body 64 is fitted to the header body 61 by providing a claw portion 67 that is bent toward the header lid body 64 at the body open end 630 of the body peripheral wall 63 as described above, the header lid body The claw portion 67 that abuts on the outer peripheral surface of the 64 suppresses the movement of the header lid 64, and the header lid 64 is reliably prevented from shifting. Further, if the claw portion 67 is formed at the main body open end 630 of the long side portion 63a, the header lid body 64 can be fixed to the header main body 61 while avoiding the inflow port 164 to which the water supply pipe is connected. The number of the claw portions 67 may be one or three or more depending on the size of the header body 61. In addition, when the main body open end 630 of the main body peripheral wall 63 has the claw portion 67, the main body open end 630 has a portion where the claw portion 67 is formed when the header lid body 64 is fitted to the header main body 61. It is preferable that the main body open end 630 excluding the main body open end 630 extends so as to be higher than the outer peripheral surface of the lid bottom plate 65 in the cross-sectional direction.

  The header lid body 64 joined to the header body 61 is directed from the periphery of the lid body bottom plate 65 toward the header body 61 when the lid body bottom plate 65 and the header body 61 and the header lid body 64 are fitted. It has a lid peripheral wall 66 that stands and opens to the header body 61 side. Like the main body peripheral wall 63 of the header main body 61, the cover peripheral wall 66 has a pair of long side portions and a pair of short side portions so that the outer surface of the cover peripheral wall 66 fits inside the inner surface of the main body peripheral wall 63. It has a substantially rectangular shape.

  As shown in FIG. 2, an inlet 164 and an outlet (not shown) are formed in the vicinity of the upper end of the lid bottom plate 65 and in the vicinity of the lower end of the lid bottom plate 75 by burring. Joint pipes 68 and 78 for connecting a connection pipe connected to the upstream end of the water supply pipe or the pipe body of the sensible heat exchanger are attached to the inlet 164 or the outlet. As a result, the fluid to be heated flows from the inflow header 60 to the outflow header 70 via the plurality of heat absorption tubes 50, the water vapor in the combustion exhaust is condensed on the outer surface of the heat absorption tubes 50, and latent heat is recovered.

  Next, an example of a method for manufacturing the latent heat exchanger according to the present embodiment will be specifically described.

  In the production of the latent heat exchanger 1, first, the upstream end 53 and the downstream end 54 of each heat absorption pipe 50 are inserted into the upstream end insertion hole 141 and the downstream end insertion hole 142 of the one side wall 14 of the casing body 10 formed by drawing. And the upstream end 53 and the downstream end 54 of the heat absorption pipe 50 are led out from the side wall 14 by a predetermined length. Then, a brazing material (such as a paste-like nickel brazing material) is applied to the boundary between the outer surface of the derived heat absorption tube 50 and the upstream end insertion hole 141 and the downstream end insertion hole 142. Next, the upstream end 53 and the downstream end 54 of the derived heat absorption pipe 50 are respectively inserted into the connection holes 160 and 170 of the header bodies 61 and 71, and the outer surfaces of the upstream end 53 and the downstream end 54 and the connection holes 160 and 170 are connected. Apply brazing material to the boundary. Note that the brazing material may be applied to the inner surfaces of the upstream end insertion hole 141 and the downstream end insertion hole 142 of the one side wall 14 and the inner surfaces of the connection holes 160 and 170 of the header main bodies 61 and 71.

  Separately from the above, joint cylinders 68 and 78 are fitted into the inlet 164 and outlet of the header lids 64 and 74 in advance, and a brazing material is applied to the boundary to temporarily fix them. The header lids 64 and 74 are jigs provided on the body peripheral walls 63 and 73 of the header bodies 61 and 71 so that the openings of the header lid bodies 64 and 74 face the openings of the header bodies 61 and 71. It arrange | positions between the retainers P and P and a pushing jig | tool (not shown), and the header cover bodies 64 and 74 are press-fitted in the header main bodies 61 and 71 with a pushing jig. After the press-fitting, the claw portions 67 and 77 provided at the main body open ends 630 and 730 of the main body peripheral walls 63 and 73 are bent toward the header cover bodies 64 and 74, and the inner surfaces of the main body peripheral walls 63 and 73 and the cover body peripheral walls 66 and 76. A brazing material is applied to the brazing reservoir M formed between the outer surface of the brazing member and the outer surface of the brazing member. At this time, the claw portions 67 and 77 are bent toward the header lids 64 and 74, but the brazing material penetrates into the base portions of the claw portions 67 and 77 by the penetration force of the brazing material.

  Next, as shown in FIG. 9 (A), the casing body so that the lower flange portion 43 of the top plate 40 is placed on the placement portion 101 provided at the periphery of the upper opening 16 of the casing body 10. The top plate 40 is placed on the top 10. At this time, the upper projecting portion 144 provided on the top plate 40 and the lower projecting portion 131 provided on the bottom wall 13 abut on the arcuate folded portions 52 of the uppermost and lowermost heat absorption tubes 50, respectively. The side rectifying plate 45 provided on the lower surface of the top plate 40 on the other side wall 15 side is a space formed between the end of the arcuate folded portion 52 on the other side wall 15 side and the inner surface of the other side wall 15. The upper rectifying plate 46 provided on the lower surface of the top plate 40 on the front wall 12 side is disposed so as to be inclined downward from the lower surface of the top plate 40 toward the entire upper edge of the opening of the exhaust outlet 121. The

  Then, as shown in FIG. 9B, the upper flange portion 102 of the casing body 10 is bent and caulked to the lower flange portion 43 of the top plate 40, and the upper opening 16 of the casing body 10 is moved to the top plate. Block at 40. Thereby, the subassembly in which the heat absorption pipe 50, the inflow header 60, and the like are temporarily fixed is assembled. As described above, in the present embodiment, the casing body 10 is integrally formed by drawing a single metal plate, and only the upper opening 16 of the casing body 10 that is less affected by drainage is the top plate. Since it is obstruct | occluded by 40, the casing 2 excellent in corrosion resistance can be produced only by joining the casing main body 10 and the top plate 40 by caulking without performing welding or brazing.

  Finally, the subassembly is put into a heating furnace and brazing is performed in the furnace. Thereby, each member is brazed at the location where the brazing material is applied, and the latent heat exchanger 1 is manufactured. In addition, since the casing body 10 and the heat absorption tube 50 are heat-treated (solution treatment) during the brazing process, the residual stress generated by the deep drawing process and the residual stress in the arcuate folded portion 52 are removed, and the strongly acidic drain is removed. The occurrence of stress corrosion cracking can be prevented even if there is contact with.

  Next, an example of the hot water supply apparatus of the present embodiment will be specifically described.

  FIG. 10 is a schematic configuration diagram showing the hot water supply apparatus of the present embodiment. A sensible heat exchanger 3 and the latent heat exchanger 1 are provided in an instrument main body (not shown).

  As shown in FIG. 10, the sensible heat exchanger 3 is disposed below the latent heat exchanger 1. A gas burner 4 for burning the gas supplied from the gas supply pipe is disposed below the sensible heat exchanger 3, and further, combustion air is blown to the gas burner 4 below the gas burner 4. A blower fan 5 is provided.

  The sensible heat exchanger 3 includes a large number of fin groups 332 arranged in parallel and a meandering tube body 331 penetrating the fin groups 332. The sensible heat exchanger 3 and the latent heat exchanger 1 are divided vertically by a bottom wall 13 of the casing body 10 of the latent heat exchanger 1.

  The sensible heat exchanger 3 and the latent heat exchanger 1 communicate with each other via the exhaust inlet 111 described above, and are sent from the sensible heat exchanger 3 to the latent heat exchanger 1 through the exhaust inlet 111. The produced combustion exhaust gas passes through the latent heat exchanger 1 and is then discharged from the exhaust outlet 121 to the outside of the instrument body.

  In the hot water supply apparatus of the present embodiment, combustion exhaust is generated by the combustion of the gas burner 4, the sensible heat exchanger 3 and the latent heat exchanger 1 are heated by this combustion exhaust, and the sensible heat exchanger 3 causes the combustion exhaust. The latent heat is absorbed from the combustion exhaust gas after the sensible heat is absorbed by the latent heat exchanger 1. At this time, the water vapor in the combustion exhaust is cooled below the dew point and the contained water vapor is condensed, so that strongly acidic drain is generated in the latent heat exchanger 1, and the drain generated in the latent heat exchanger 1 is It drops on the bottom wall 13 of the casing body 10. However, as described above, since the latent heat exchanger 1 of the present embodiment has the casing body 10 integrally formed by drawing, there is no joint portion by welding or brazing below the casing 2. Therefore, the retention of the drain is reduced below the casing 2, and the drain can be smoothly discharged from the drain outlet 17 provided in the bottom wall 13 to the neutralizer. As a result, corrosion of the casing 2 due to drain can be suppressed, and a hot water supply device having high durability can be obtained.

  The joint cylinder 68 of the inflow header 60 is connected to a water supply pipe that guides cold water from a water supply source such as a water pipe, and the joint cylinder 78 of the outflow header 70 is connected to the upstream end of the pipe body 331 of the sensible heat exchanger 3. It is connected to a connecting pipe that communicates with Accordingly, the cold water from the water supply pipe is heated while passing through the latent heat exchanger 1 and the sensible heat exchanger 3 to become hot water, and the downstream end of the tube body 331 of the sensible heat exchanger 3 is connected. Sent from the hot water pipe to a hot water supply terminal such as a bathroom or kitchen.

(Embodiment 2)
In the first embodiment, the latent heat exchanger used in the hot water supply apparatus having one heating circuit has been described. However, in the present embodiment, the latent heat exchanger used in the hot water supply apparatus having two heating circuits is described. To do. In addition, about the structure similar to the latent heat exchanger and hot water supply apparatus in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 11 is a schematic perspective view of the latent heat exchanger 1a of the present embodiment as viewed from the back side.

  As shown in the figure, the casing of the latent heat exchanger 1a includes a casing body 10 and a top plate 40 that closes the upper opening of the casing body 10, as in the first embodiment. The partition wall W defines a first region on the one side wall 14 side and a second region on the other side wall 15 side, and the first endothermic tube 50a and the second endothermic tube 50b are arranged in each region parallel in the left-right direction. Is housed. The configuration of the first and second heat absorption tubes 50a and 50b is the same as that of the first embodiment.

  As in the first embodiment, the casing body 10 has a back wall 11, a front wall 12, a bottom wall 13, one side wall 14, and the other side wall 15 integrally formed by drawing. In addition, two exhaust inlets 111a and 111b are opened in the rear wall 11 in order to introduce combustion exhaust into each of the first region and the second region. As shown in FIG. 12, the front wall 12 has one exhaust outlet 121 communicating with the first and second regions. However, like the rear wall 11, two exhaust outlets are provided. May be. Furthermore, although not shown, the first side wall 14 has a first upstream end insertion hole and a first downstream end insertion hole through which the upstream end and the downstream end of the first heat absorption pipe 50a are inserted, respectively. The second side wall 15 is provided with a second upstream end insertion hole and a second downstream end insertion hole through which the upstream end and the downstream end of the second heat absorption pipe 50b are inserted. The bottom wall 13 is provided with a lower protruding portion 131 that comes into contact with the arcuate folded portions of the first and second endothermic pipes 50a and 50b, and a drain outlet 17 for discharging the drain. .

  Therefore, also in the latent heat exchanger 1a of the present embodiment, the casing body 10 does not have a welded or brazed joint portion, and it is necessary to perform welding work or brazing work for assembling the casing body 10. Absent. In addition, since a joint portion by welding or brazing is not formed below the casing, even if drain is generated, retention of the drain below the casing can be reduced. Furthermore, since the back wall 11, the front wall 12, the bottom wall 13, the one side wall 14, and the other side wall 15 are integrally formed by drawing, a casing can be easily manufactured with a small number of parts. And since only the upper opening part of the casing main body 10 with little influence of drain is obstruct | occluded with the top plate 40, it only joins the casing main body 10 and the top plate 40 by caulking without performing welding or brazing. A casing having excellent corrosion resistance can be produced.

  The top plate 40 has the same configuration as that of the first embodiment, but the side rectifying plate 45 is provided only in the first region on the one side wall 14 side. In addition, although a side baffle plate can also be provided in the second region, for example, if the partition wall W is provided after the second heat absorption tube 50b is accommodated, the partition wall W is connected to the second heat absorption tube 50b. It can arrange | position close to the edge part of this circular arc-shaped folding | turning part. Therefore, in this embodiment, the side rectifying plate 45 may be provided in either the first region or the second region.

  A first inflow header 60 a and a first outflow header 70 a connected to the upstream end and the downstream end of the first heat absorption pipe 50 a are disposed outside the one side wall 14. A second inflow header 60b and a second outflow header 70b connected to the upstream end and the downstream end of the second heat absorption pipe 50b are disposed outside. Each of these headers has the same header body and header lid as in the first embodiment.

  FIG. 12 is a schematic configuration diagram showing an example of a hot water supply apparatus having the latent heat exchanger 1a.

  In this hot water supply apparatus, the combustion exhaust generated by the first gas burner 4a is sent to the first sensible heat exchanger 3a by the blower fan 5a to recover the sensible heat, and further the first heat of the latent heat exchanger 1a. The latent heat is recovered by being sent to the area. Similarly, the combustion exhaust generated by the second gas burner 4b is sent to the second sensible heat exchanger 3b by the blower fan 5b to recover the sensible heat, and further to the second region of the latent heat exchanger 1a. It is sent and latent heat is recovered. According to this hot water supply apparatus, for example, one heating circuit can be used for a hot water heating circuit, and the other heating circuit can be used for a heating heating circuit.

  (Other embodiments)

(1) In the above-described embodiment, the upper flange portion is provided on the casing body and the top plate is caulked. However, the upper flange portion may be provided on the top plate and the casing main body may be caulked with the top plate.

(2) In the above embodiment, the side rectifying plate is joined to the top plate, but the side rectifying plate and the top plate are separate members, and after the endothermic tube is accommodated in the casing body, A side rectifying plate may be joined to the bottom wall before joining to the top plate. In this case, in consideration of the noise described above, it is preferable that the upper end of the side rectifying plate does not extend until it abuts on the top plate.

  As mentioned above, although this invention was demonstrated in detail, it will be as follows if the suitable aspect of this invention is illustrated.

According to a preferred aspect of the present invention, in the latent heat exchanger,
A plurality of the heat absorption tubes are housed in the casing;
Each of the endothermic tubes has a piping structure in which the straight portion and the arcuate folded portion are repeated continuously in the casing,
The plurality of heat absorption tubes are arranged such that at least the arcuate folded portion overlaps between the top plate and the bottom wall,
The arcuate folded portion has a flat cross-sectional shape that is flattened in the direction in which the endothermic tubes are stacked,
Each of the top plate and the bottom wall has an upper protruding portion and a lower protruding portion that protrude toward the inside of the casing,
The upper projecting portion contacts the uppermost arcuate folded portion located on the top plate side, and the lower projecting portion contacts the lowermost arcuate folded portion located on the bottom wall side.

  According to the latent heat exchanger, since the arcuate folded portions of the endothermic tubes arranged so as to overlap between the top plate and the bottom wall have a flat cross-sectional shape, each endothermic portion has an endothermic property compared to the endothermic tube having a circular cross-sectional shape. The tubes can be arranged densely, and thereby the height in the direction in which the heat absorption tubes are stacked can be suppressed. Further, since the arrangement density of the endothermic tubes is increased, the amount of useless combustion exhaust exhausted without contacting the endothermic tubes is reduced, whereby high thermal efficiency can be obtained. Furthermore, as described above, when a plurality of endothermic tubes are stacked between the top plate and the bottom wall, the endothermic tubes tend to vibrate or deform, but according to the latent heat exchanger, the top plate and Each of the bottom walls has an upper protruding portion and a lower protruding portion that protrude toward the inside of the casing, and these upper protruding portion and lower protruding portion are in contact with the flattened arcuate folded portion. The endothermic tube can be stably fixed without using a fixing member for fixing the endothermic tube. In addition, the casing can be manufactured by closing the upper opening of the casing body integrally formed with the back wall, the front wall, the bottom wall, the one side wall, and the other side wall with a top plate, and therefore another fixing member is used. The endothermic tube can be fixed without being blocked by the top plate. For this reason, high workability can be obtained.

Preferably, in the latent heat exchanger,
Each endothermic tube has a rectilinear portion extending between the one side wall and the other side wall and an arcuate folded portion located at both ends of the one side wall and the other side wall in the casing. A continuous piping structure,
The top plate has the upper protrusions at both ends on the one side wall side and the other side wall side,
The upper projecting portions at both ends are in contact with the arcuate folded portions at both ends of the uppermost stage,
The bottom wall has the lower protrusions at both ends on the one side wall side and the other side wall side,
The lower projecting portions at both ends are in contact with the arcuate folded portions at both ends of the lowermost stage.

  According to the latent heat exchanger, flattened arcuate folded portions are formed at both ends of the one side wall side and the other side wall side, and the uppermost and lowermost stages of the arcuate folded portions at both ends are respectively a top plate and Since the upper projecting portion and the lower projecting portion provided on the bottom wall are in contact with each other, the heat absorption tube can be more stably fixed in the casing.

Furthermore, according to another preferred aspect of the present invention, in the latent heat exchanger,
At least one of the inflow header and the outflow header has a container-shaped header body and a container-shaped header lid body fitted in the header body in an internally fitted state, and the openings are opposed to each other. The header body and the header lid are formed by brazing,
The header body has a main body bottom plate having a connection hole to which an upstream end or a downstream end of the heat absorption pipe is connected, and extends from the periphery of the main body bottom plate toward the header lid body, and is opened to the header lid body side. A body peripheral wall,
The header lid includes a lid bottom plate having an inlet or an outlet, and a lid peripheral wall that extends from the periphery of the lid bottom plate toward the header body and opens to the header body. And
When the header main body and the header lid are fitted, the outer surface of the lid peripheral wall is fitted into the inner surface of the main body peripheral wall, and between the inner surface of the main body peripheral wall and the outer surface of the lid peripheral wall. In addition, the main body peripheral wall and the lid peripheral wall are formed so as to form a wax reservoir.

  In joining the conventional header body and header lid, since the brazing material was applied only on the main body open end of the peripheral wall of the body, the brazing material is likely to scatter and sag, and the header body and the header lid are securely connected. Difficult to join. On the other hand, according to the latent heat exchanger, when the header body and the header lid body are fitted together to join the vessel-shaped header body and the vessel-shaped header lid body by brazing, the peripheral wall of the body A brazing material is formed between the inner surface of the cover body and the outer surface of the peripheral wall of the lid body, so that the brazing material in the brazing process is more than the case where the brazing material is applied only on the main body open end of the header body as in the prior art. Inconveniences such as scattering and dripping can be avoided, and the joining area between the inner surface of the main body peripheral wall and the outer surface of the cover peripheral wall can be increased.

In the latent heat exchanger,
The main body peripheral wall may be formed such that the main body open end extends outward.

  According to the latent heat exchanger, the joining area between the inner surface of the main body peripheral wall and the outer surface of the lid peripheral wall can be easily increased.

In the latent heat exchanger,
When the header main body and the header lid are fitted, at least a part of the main body open end of the peripheral wall of the main body may extend to a height equal to or higher than the outer peripheral surface of the lid bottom plate in the cross-sectional direction. .

  According to the latent heat exchanger, the bonding area between the inner surface of the main body peripheral wall and the outer surface of the lid peripheral wall can be increased.

In the latent heat exchanger,
The main body open end of the main body peripheral wall may have a claw portion that is bent toward the header lid when the header main body and the header lid are fitted.

  When brazing the header body and the header lid body, the header lid body is first press-fitted into the header body. However, due to manufacturing errors in both peripheral walls, the header lid body may deviate from the header body after press-fitting. As a result, it is difficult to join the header body and the header lid body with high accuracy. On the other hand, if the main body open end of the peripheral wall has a claw portion that is bent toward the header lid body, the claw portion is bent after the header lid body is press-fitted into the header body. It is possible to prevent the header cover from shifting.

  Preferably, in the latent heat exchanger, the main body peripheral wall is formed in a substantially rectangular shape having a pair of long sides and a pair of short sides, and at least one main body open end of the pair of long sides. Has the claw portion. In this case, the main body open ends of the pair of long side portions facing each other on the main body peripheral wall have the claw portions, and the claw portions of the main body open ends of the long side portions are in the short side portion direction. You may arrange | position so that it may not overlap.

  According to the latent heat exchanger, it is possible to reliably prevent the header lid from being displaced when the header body and the header lid are fitted.

According to another preferred aspect of the present invention, the latent heat exchanger further comprises:
A second endothermic tube accommodated in the casing in parallel with the endothermic tube; a second inflow header for introducing a second heated fluid into the second endothermic tube; and the second endothermic tube. A second outflow header for deriving a second heated fluid from
The other side wall has a second upstream end insertion hole through which the upstream end of the second heat absorption pipe is inserted and a second downstream end insertion hole through which the downstream end of the second heat absorption pipe is inserted. And
Each of the second inflow header and the second outflow header is disposed outside the other side wall, and passes through the second upstream end insertion hole and the second downstream end insertion hole, and the other side wall. Are connected to the upstream end and the downstream end of the second heat absorption pipe led out to the outside.

  According to the latent heat exchanger, in the latent heat exchanger used in the hot water supply apparatus having a plurality of heating circuits, corrosion due to drain can be suppressed, and the latent heat exchanger can be easily manufactured.

DESCRIPTION OF SYMBOLS 1 Latent heat exchanger 2 Casing 10 Casing main body 11 Back wall 12 Front wall 13 Bottom wall 14 One side wall 15 The other side wall 16 Upper opening part 17 Drain drain port 40 Top plate 45 Side rectifying plate 50 Endothermic pipe 51 Linear part 52 Arc shape Folded portion 60, 60a, 60b Inflow header 70, 70a, 70b Outflow header 111 Exhaust inlet 121 Exhaust outlet 141 Upstream end insertion hole 142 Downstream end insertion hole 452 Inclined surface

Claims (6)

A casing having a combustion exhaust passage therein, a heat absorption pipe accommodated in the casing, an inflow header for introducing a heated fluid into the heat absorption pipe, and an outflow header for deriving the heated fluid from the heat absorption pipe A latent heat exchanger comprising:
The casing has a box-shaped casing body having an upper opening, and a top plate for closing the upper opening of the casing body.
The casing body includes a rear wall, a front wall, a bottom wall having a drain outlet, an upstream end insertion hole through which the upstream end of the heat absorption pipe is inserted, and a downstream end insertion through which the downstream end of the heat absorption pipe is inserted. Having one side wall having a hole and the other side wall;
Said rear wall, said front wall, said bottom wall, said one side wall, and the other side wall, by deep drawing a piece of metal plate, each of said rear wall and said front from the front and rear side edges of the bottom wall The wall stands up via the corner R portion, and the one side wall and the other side wall stand up from the left and right side edge portions of the bottom wall via the corner R portion, and the left and right side edges of the back wall and the front wall. The one side wall and the other side wall are respectively integrally molded from the part via a corner R part ,
The inflow header and the outflow header are respectively arranged outside the one side wall, and upstream of the heat absorption pipe led out to the outside of the one side wall through the upstream end insertion hole and the downstream end insertion hole. And a latent heat exchanger connected to the downstream end. The latent heat exchanger according to claim 1,
The casing main body and the top plate are joined together by caulking to form a latent heat heat exchanger. The latent heat exchanger according to claim 1 or 2,
In the casing, the endothermic tube includes a linear portion extending between the one side wall and the other side wall, and an arcuate folded portion located at both ends of the one side wall side and the other side wall side. Has a continuous piping structure,
A latent heat exchanger having a flat side rectifying plate between the arcuate folded portion on the other side wall of the heat absorption tube and the inner surface of the other side wall. The latent heat exchanger according to claim 3, wherein
The back wall has an exhaust inlet through which the combustion exhaust is introduced, and the front wall has an exhaust outlet through which the combustion exhaust is led out,
The side rectifier plate is a latent heat exchanger having inclined surfaces that are inclined from both ends of the exhaust inlet side and the exhaust outlet side toward the heat absorption pipe. The latent heat exchanger according to claim 3 or 4, wherein
The upper end of the side rectifying plate is joined to the lower surface of the top plate,
The lower end of the side current plate is a latent heat exchanger that is not in contact with the bottom wall.   A hot water supply apparatus having the latent heat exchanger according to any one of claims 1 to 5.

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