JP7549211B2 - Heat exchangers and hot water equipment - Google Patents

Description

The present invention relates to a heat exchanger and a hot water device.

Patent document 1 (Japanese Utility Model Publication No. 62-36027) describes a heat exchanger. The heat exchanger described in Patent document 1 has a case, a heat transfer tube, and a first bracket and a second bracket. The case has a first side wall and a second side wall that face each other with a gap between them, and a third side wall and a fourth side wall that face each other with a gap between them.

The heat transfer tube is a serpentine tube. The heat transfer tube has multiple straight tube sections extending in the direction in which the first side wall and the second side wall face each other. Both ends of the straight tube sections are supported by a first bracket and a second bracket, respectively. The heat transfer tube (straight tube sections) are disposed inside the case by brazing the first bracket and the second bracket to the outer wall surfaces of the first side wall and the second side wall, respectively.

Patent document 2 (JP Patent Publication No. 7-65863) describes a heat exchanger. The heat exchanger described in Patent document 2 has a case, a heat transfer tube, and fins. The case has a first side wall and a second side wall that face each other with a gap therebetween, and a third side wall and a fourth side wall that face each other with a gap therebetween. The heat transfer tube is a serpentine tube. The heat transfer tube has a number of straight tube sections that extend in the direction in which the first side wall and the second side wall face each other. Both ends of the straight tube sections are supported by the first side wall and the second side wall, respectively. The fins are attached to the straight tube sections by brazing.

Japanese Utility Model Publication No. 62-36027 Special Publication No. 7-65863

The heat exchanger described in Patent Document 1 and the heat exchanger described in Patent Document 2 do not have multiple heat exchange sections stacked vertically. Therefore, in the heat exchanger described in Patent Document 1 and the heat exchanger described in Patent Document 2, it is not assumed that the brazing material will fall from the upper heat exchange section and adhere to the lower heat exchange section when brazing is performed. If the brazing material that falls from the upper heat exchange section joins the heat transfer tube and case of the lower heat exchange section, there is a risk that the heat transfer tube will be damaged at the joint.

The present invention has been made in consideration of the problems of the conventional technology as described above. More specifically, the present invention provides a heat exchanger and a hot water device that can prevent brazing material that falls from a heat exchange section above during brazing from joining the heat transfer tube and the case of the heat exchange section below.

The heat exchanger of the present invention includes a case having a first side wall and a second side wall that face each other with a gap in a first direction, and a third side wall and a fourth side wall that face each other with a gap in a second direction perpendicular to the first direction, a first heat exchange section and a second heat exchange section that are housed in the case and arranged to overlap in a third direction perpendicular to the first direction and the second direction, and a brazing receiver. The first heat exchange section has a plurality of first heat transfer tubes that are arranged to overlap along the second direction. Each of the plurality of first heat transfer tubes includes a plurality of straight tube sections, a plurality of first curved tube sections, and a plurality of second curved tube sections. The plurality of straight tube sections are arranged in a row along the third direction. Each of the plurality of straight tube sections extends along the first direction. Each of the plurality of first curved tube sections connects one end in the first direction of two of the plurality of straight tube sections that are adjacent in the third direction. Each of the second curved pipe sections is located at a position other than both ends in the third direction, and connects the other ends in the first direction of two of the straight pipe sections adjacent in the third direction. The other ends in the first direction of each of the straight pipe sections located at both ends in the third direction are supported by the second side wall. The second heat exchange section has a plurality of second heat transfer tubes extending along the first direction. Both ends in the first direction of each of the second heat transfer tubes are brazed to the first side wall and the second side wall, respectively. The brazing receiver is located between the first heat exchange section and the second heat exchange section in the third direction, and extends along the second direction so as to overlap the first curved pipe sections in the first direction.

The heat exchanger may further include a support plate attached to the first side wall and supporting one end of the first heat transfer tubes in the third direction. The brazing receptacle may be integrally provided on the end of the support plate on the second heat exchanger side in the third direction.

In the above heat exchanger, the brazing material receiving portion may have a through hole formed therein that passes through the brazing material receiving portion along the third direction.

In the above heat exchanger, a standing wall may be formed around the periphery of the through hole, extending toward the second heat exchange section along the third direction.

In the above heat exchanger, the brazing material receiving portion may be inclined away from the second heat exchange portion from one of the third side wall and the fourth side wall toward the other of the third side wall and the fourth side wall.

The hot water device of the present invention includes the above-mentioned heat exchanger and a combustion device that supplies combustion gas to the above-mentioned heat exchanger.

The heat exchanger and hot water device of the present invention prevent the brazing material from dropping from the heat exchange section above from joining the heat transfer tube and case of the heat exchange section below when brazing the heat exchanger.

FIG. 1 is a first perspective view of a heat exchanger 100. FIG. 2 is a second perspective view of the heat exchanger 100. FIG. 2 is a front view of the heat exchanger 100. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. FIG. 6 is an enlarged view of FIG. 5 . 2 is a perspective view of a support plate 50 in the heat exchanger 100. FIG. FIG. 2 is a schematic diagram of a water heating device 200.

Details of the embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are given the same reference symbols, and overlapping descriptions will not be repeated.

(Configuration of heat exchanger according to embodiment)
The configuration of a heat exchanger according to an embodiment (hereinafter referred to as "heat exchanger 100") will be described below.

Figure 1 is a first perspective view of the heat exchanger 100. Figure 2 is a second perspective view of the heat exchanger 100. Figure 3 is a front view of the heat exchanger 100. Figure 4 is a cross-sectional view taken along line IV-IV in Figure 3. Figure 5 is a cross-sectional view taken along line V-V in Figure 4. In Figure 4, the illustration is omitted except for the case 10, the first heat transfer tube 21, and the support plate 50. Figure 6 is an enlarged view of Figure 5. Figure 7 is a perspective view of the support plate 50 in the heat exchanger 100. As shown in Figures 1 to 7, the heat exchanger 100 has a case 10, a first heat exchange section 20, a second heat exchange section 30, and a support plate 50.

The case 10 has a first side wall 11, a second side wall 12, a third side wall 13, a fourth side wall 14, and a bottom wall 15. The first side wall 11 and the second side wall 12 face each other with a gap between them. The direction in which the first side wall 11 and the second side wall 12 face each other is defined as a first direction DR1. The third side wall 13 and the fourth side wall 14 face each other with a gap between them. The direction in which the third side wall 13 and the fourth side wall 14 face each other is defined as a second direction DR2. The second direction DR2 is perpendicular to the first direction DR1. Although not shown, an exhaust port 13a is formed in the third side wall 13. The exhaust port 13a penetrates the third side wall 13 along the thickness direction.

The direction perpendicular to the first direction DR1 and the second direction DR2 is the third direction DR3. The case 10 has an opening 16 at one end in the third direction DR3, and an opening 17 at the other end in the third direction DR3. The opening 17 is closed by the bottom wall 15.

The first heat exchange section 20 and the second heat exchange section 30 are arranged overlapping each other in the third direction DR3. The second heat exchange section 30 is closer to the opening 16 than the first heat exchange section 20 in the third direction DR3. The first heat exchange section 20 functions as a secondary heat exchanger, and the second heat exchange section 30 functions as a primary heat exchanger.

The first heat exchange section 20 has a plurality of first heat transfer tubes 21. The first heat transfer tubes 21 are serpentine tubes that meander in a plane perpendicular to the second direction DR2. The plurality of first heat transfer tubes 21 are arranged overlapping each other along the second direction DR2. Two first heat transfer tubes 21 adjacent to each other in the second direction DR2 are offset in position in the third direction DR3. The first heat transfer tubes 21 are formed, for example, from stainless steel.

The first heat transfer tube 21 has a plurality of straight pipe sections 22, a plurality of first curved pipe sections 23, and a plurality of second curved pipe sections 24. The straight pipe sections 22 extend along the first direction DR1. The straight pipe sections 22 are arranged in a row along the third direction DR3.

Of the multiple straight pipe sections 22, those at both ends in the third direction DR3 are referred to as straight pipe section 22a and straight pipe section 22b, respectively. Straight pipe section 22a is closer to the opening 17 than straight pipe section 22a in the third direction DR3. Of the multiple straight pipe sections 22, those at the other ends in the third direction DR3 are referred to as straight pipe section 22c.

Of the straight pipe sections 22 adjacent to each other in the third direction DR3, one end in the first direction DR1 (the end on the first side wall 11 side) of two of them is connected by a first curved pipe section 23. The other end in the first direction DR1 of the straight pipe section 22a (the end on the second side wall 12 side) and the other end in the first direction DR1 of the straight pipe section 22b are supported by the second side wall 12. From another perspective, the first heat transfer tube 21 is cantilevered by the case 10 (second side wall 12). The other ends in the first direction DR1 of two of the straight pipe sections 22c adjacent to each other in the third direction DR3 are connected by a second curved pipe section 24.

A header 25 and a header 26 are attached to the outer wall surface of the second side wall 12. The other end of the straight pipe section 22a in the first direction DR1 is connected to the header 25. The header 25 has a water inlet 27 that is connected to the inside of the header 25. The other end of the straight pipe section 22b in the first direction DR1 is connected to the header 26. The header 26 has a water outlet 28 that is connected to the inside of the header 26.

The second heat exchange section 30 has a plurality of body tubes 31 and a plurality of second heat transfer tubes 32. The plurality of body tubes 31 are closer to the opening 16 in the third direction DR3 than the plurality of second heat transfer tubes 32. The body tubes 31 and the second heat transfer tubes 32 are formed, for example, from stainless steel.

The multiple body tubes 31 are arranged in a stacked manner along the third direction DR3. The body tubes 31 extend along the inner wall surface of the third side wall 13, the inner wall surface of the first side wall 11, and the inner wall surface of the fourth side wall 14. The body tubes 31 are attached to the inner wall surface of the third side wall 13, the inner wall surface of the first side wall 11, and the inner wall surface of the fourth side wall 14 by brazing.

One end of the body pipe 31 and the other end of the body pipe 31 are supported by the second side wall 12. One end of the body pipe 31 is on the third side wall 13 side, and the other end of the body pipe 31 is on the fourth side wall 14 side. One end of the body pipe 31 closest to the opening 16 in the third direction DR3 is connected to the water outlet 28 by a connecting pipe 33. The other end of a certain body pipe 31 is connected to one end of another body pipe 31 adjacent to that body pipe 31 in the third direction DR3 by a connecting pipe 34.

The second heat transfer tube 32 extends along the first direction DR1. One end (the end on the first side wall 11 side) and the other end (the end on the second side wall 12 side) of the second heat transfer tube 32 in the first direction DR1 are attached to the first side wall 11 and the second side wall 12, respectively. This attachment is performed by brazing.

The second heat transfer tubes 32 are arranged in a number of rows along the second direction DR2. The second heat transfer tubes 32 include, for example, a number of second heat transfer tubes 32a arranged in a row along the second direction DR2, and a number of second heat transfer tubes 32b (not shown) arranged in a row along the second direction DR2. The second heat transfer tubes 32a are closer to the opening 16 in the third direction DR3 than the second heat transfer tubes 32b.

Of the multiple second heat transfer tubes 32a, the one closest to the fourth side wall 14 is referred to as the second heat transfer tube 32aa. Of the multiple second heat transfer tubes 32a, the one closest to the third side wall 13 is referred to as the second heat transfer tube 32ab. Of the multiple second heat transfer tubes 32b, the one closest to the fourth side wall 14 is referred to as the second heat transfer tube 32ba. Of the multiple second heat transfer tubes 32b, the one closest to the third side wall 13 is referred to as the second heat transfer tube 32bb.

One end in the first direction DR1 of two of the second heat transfer tubes 32a adjacent to each other in the second direction DR2 is connected by a connecting tube 35. The other end in the first direction DR1 of two of the second heat transfer tubes 32a adjacent to each other in the second direction DR2 is connected by a connecting tube 36. However, the other end in the first direction DR1 of the second heat transfer tube 32aa is connected by a connecting tube 37 to the other end of the body tube 31 that is farthest from the opening 16 in the third direction DR3. In addition, one end in the first direction DR1 of the second heat transfer tube 32ab is connected by a connecting tube 38 to one end in the first direction DR1 of the second heat transfer tube 32bb.

One ends of two of the second heat transfer tubes 32b adjacent to each other in the second direction DR2 in the first direction DR1 are connected by a connecting tube 39. However, one end of the second heat transfer tube 32ba is connected to one end of the connecting tube 40. The other ends of two of the second heat transfer tubes 32b adjacent to each other in the second direction DR2 in the first direction DR1 are connected by a connecting tube 41. However, as described above, one end of the second heat transfer tube 32bb in the first direction DR1 is connected to one end of the second heat transfer tube 32ab in the first direction DR1 by the connecting tube 38. The other end of the connecting tube 40 is a water outlet 42.

A number of fins 32c are attached to the second heat transfer tube 32. The fins 32c are attached by brazing. The fins 32c are made of, for example, stainless steel. One main surface of the fin 32c faces the first side wall 11, and the other main surface of the fin 32c faces the second side wall 12. The multiple fins 32c are arranged at intervals in the first direction DR1. Note that only some of the fins 32c are shown in the figure, and the remaining fins 32c are not shown.

The support plate 50 is attached to the inner wall surface of the first side wall 11. The support plate 50 is attached to the first side wall 11 by, for example, spot welding. The support plate 50 has a support portion 51 and a brazing filler receiving portion 52. The support plate 50 is formed, for example, from stainless steel. The support plate 50 is two-fold rotationally symmetric about the center of the support portion 51 when viewed along the first direction DR1. From another perspective, the support plate 50 can be used in the same way even if it is rotated 180° around the above-mentioned center.

The support portion 51 faces the first side wall 11 with a gap in between in the first direction DR1. The support portion 51 is plate-shaped. The support portion 51 supports one end of the straight pipe portion 22 in the first direction DR1. This support is provided along the third direction DR3. The support portion 51 has a plurality of openings 51a formed therein. The openings 51a penetrate the support portion 51 along the thickness direction. One end of the straight pipe portion 22 in the first direction DR1 is supported by the edge of the openings 51a. The edge of the openings 51a is wavy to match the arrangement of the straight pipe portion 22.

The brazing receiving portion 52 is formed by bending the end of the support plate 50 on the second heat exchange section 30 side toward the first side wall 11. The support plate 50 is attached to the first side wall 11 at the brazing receiving portion 52. The brazing receiving portion 52 is located between the first heat exchange section 20 and the second heat exchange section 30 in the third direction DR3. The brazing receiving portion 52 is located in a position overlapping with the first curved pipe section 23 in the first direction DR1. The brazing receiving portion 52 may also overlap one end side of the straight pipe section 22 in the first direction DR1 in the first direction DR1.

The brazing filler receptacle 52 extends along the second direction DR2. In the second direction, the brazing filler receptacle 52 extends to a position closer to the third side wall 13 than the first heat transfer tube 21 closest to the third side wall 13, and to a position closer to the fourth side wall 14 than the first heat transfer tube 21 closest to the fourth side wall 14. The brazing filler receptacle 52 is inclined away from the second heat exchange section 30 as it moves from the fourth side wall 14 side to the third side wall 13 side. The brazing filler receptacle 52 may be inclined away from the second heat exchange section 30 as it moves from the third side wall 13 side to the fourth side wall 14 side.

A through hole 52a may be formed in the brazing material receiving portion 52. The through hole 52a penetrates the brazing material receiving portion 52 along the thickness direction. The through hole 52a is formed, for example, at a position that partially overlaps the straight pipe portion 22 in the first direction DR1 and partially overlaps the first curved pipe portion 23 in the first direction DR1. However, the through hole 52a does not overlap the portion of the first curved pipe portion 23 where the distance from the first side wall 11 is the smallest. The through hole 52a extends along the second direction DR2. A standing wall 52b may be formed on the periphery of the through hole 52a. The standing wall 52b rises toward the second heat exchange portion 30 along the third direction DR3.

(Configuration of the hot water device according to the embodiment)
The configuration of a hot water device according to an embodiment (hereinafter referred to as "hot water device 200") will be described below.

Figure 8 is a schematic diagram of a hot water device 200. As shown in Figure 8, the hot water device 200 has a heat exchanger 100. The hot water device 200 further has a gas valve 110, an orifice 111, a venturi 112, a blower 113, a chamber 114, a burner 115, an ignition plug 116, a duct 120, a pipe 130, a pipe 140, a bypass pipe 150, and a three-way valve 160.

By opening the gas valve 110, the fuel gas is supplied to the venturi 112 through the orifice 111. The fuel gas supplied to the venturi 112 is mixed with air in the venturi 112 (hereinafter, the fuel gas mixed with air is referred to as mixed gas). The mixed gas is supplied to the burner 115 through the chamber 114 by the blower 113.

The mixed gas supplied to the burner 115 is ignited and combusted by sparking the ignition plug 116. This generates combustion gas in the burner 115. The burner 115 is attached to the heat exchanger 100. More specifically, the burner 115 is attached to the opening 16. Therefore, the combustion gas generated by the burner 115 flows inside the case 10 from the opening 16 side toward the opening 17 side.

One end of the pipe 130 is connected to the water supply. The other end of the pipe 130 is connected to the water inlet 27. One end of the pipe 140 is connected to the water outlet 42. The other end of the pipe 140 is connected to a hot water tap (not shown).

The bypass pipe 150 is connected at one end to the pipe 130 and at the other end to the pipe 140. The bypass pipe 150 and the pipe 140 are connected by a three-way valve 160. The duct 120 is connected to the heat exchanger 100. More specifically, the duct 120 is connected to the exhaust port 13a.

Water supplied from one end of the piping 130 flows through the piping 130 and is supplied to the first heat exchange section 20 (first heat transfer tube 21). The water supplied to the first heat exchange section 20 is heated by heat exchange with the combustion gas. The water that has flowed through the first heat exchange section 20 flows through the connecting tube 33 and is supplied to the second heat exchange section 30 (body tube 31 and second heat transfer tube 32).

The water supplied to the second heat exchange section 30 is heated by heat exchange with the combustion gas. The water that flows through the second heat exchange section 30 flows through the pipe 140 and is supplied from the hot water tap. The water that flows through the second heat exchange section 30 is mixed with clean water supplied from the bypass pipe 150 in the pipe 140, thereby adjusting the temperature of the water (hot water) supplied from the hot water tap. The combustion gas that has exchanged heat with the water that has flowed through the first heat exchange section 20 and the second heat exchange section 30 is discharged to the outside from the duct 120.

(Effects of the heat exchanger according to the embodiment)
The effects of the heat exchanger 100 will be described below.

Since the heat exchanger 100 contains multiple heat exchange sections (first heat exchange section 20 and second heat exchange section 30) in the case 10, the brazing of the heat exchanger 100 is performed all at once. During this brazing, the heat exchanger 100 is placed in the furnace so that the third direction DR3 coincides with the vertical direction.

If the brazing receptacle 52 is not provided, the brazing material for attaching the second heat transfer tube 32 to the first side wall 11 may drip during brazing, and the first curved pipe section 23 and the inner wall surface of the first side wall 11 may be joined by the dripping brazing material. If the first curved pipe section 23 and the inner wall surface of the first side wall 11 are joined by the dripping brazing material, the water hammer phenomenon that occurs when water flows through the first curved pipe section 23 may cause damage to the portion of the first curved pipe section 23 that is joined to the inner wall surface of the first side wall 11 by the brazing material.

However, the heat exchanger 100 is provided with a brazing material receiving portion 52. Therefore, the brazing material dripping from the second heat transfer tube 32 is received by the brazing material receiving portion 52. As a result, the heat exchanger 100 prevents the bonding between the first bent pipe portion 23 and the inner wall surface of the first side wall 11 caused by the brazing material dripping from the heat exchange portion above (the second heat exchange portion 30), and thus suppresses damage to the first bent pipe portion 23 when water flows through it.

The first heat transfer tube 21 is supported by the second side wall 12 in a cantilevered manner. As a result, the first heat transfer tube 21 softens as the temperature rises during brazing, and one end of the straight tube section 22 in the first direction DR1 that is not supported by the first side wall 11 bends downward.

In the heat exchanger 100, one end of the straight pipe section 22 in the first direction DR1 is supported along the third direction DR3 by the support section 51, so that even if the first heat transfer tube 21 softens during brazing, the one end of the straight pipe section 22 in the first direction DR1 is unlikely to bend downward.

When a through hole 52a is formed in the brazing material receiving portion 52, the combustion gas generated by the burner 115 can pass through the through hole 52a. Therefore, in this case, it is possible to suppress the decrease in heat exchange efficiency caused by the provision of the brazing material receiving portion 52. When a vertical wall 52b is formed in the brazing material receiving portion 52, it is possible to suppress the brazing material received by the brazing material receiving portion 52 from passing through the through hole 52a and falling onto the first curved pipe portion 23, thereby joining the first curved pipe portion 23 and the inner wall surface of the first side wall 11.

When the brazing material receiving portion 52 is inclined away from the second heat exchange portion 30 as it moves from the fourth side wall 14 side to the third side wall 13 side (from the third side wall 13 side to the fourth side wall 14 side), the brazing material received by the brazing material receiving portion 52 moves with this inclination and falls onto the bottom wall 15 near the third side wall 13 (fourth side wall 14) where the first heat transfer tube 21 is not arranged. In this way, when the brazing material receiving portion 52 is inclined away from the second heat exchange portion 30 as it moves from the fourth side wall 14 side to the third side wall 13 side (from the third side wall 13 side to the fourth side wall 14 side), the dripping brazing material can be disposed of without adverse effects.

Although the embodiment of the present invention has been described above, the above-mentioned embodiment can be modified in various ways. Furthermore, the scope of the present invention is not limited to the above-mentioned embodiment. The scope of the present invention is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

This embodiment is particularly advantageously applicable to heat exchangers that include multiple heat exchange sections within a case and hot water devices that have the same.

10 Case, 11 First side wall, 12 Second side wall, 13 Third side wall, 13a Exhaust port, 14 Fourth side wall, 15 Bottom wall, 16, 17 Opening, 20 First heat exchange section, 21 First heat transfer tube, 22, 22a, 22b, 22c Straight tube section, 23 First bent tube section, 24 Second bent tube section, 25, 26 Header, 27 Water inlet, 28 Water outlet, 30 Second heat exchange section, 31 Body tube, 32, 32a, 32aa, 32ab, 32b, 32ba, 32bb Second heat transfer tube, 32c Fin, 33, 34, 35, 36, 37, 38, 39, 40, 41 Connecting tube, 42 Water outlet, 50 Support plate, 51 Support section, 51a Opening, 52 Brazing receiver, 52a through hole, 52b standing wall, 100 heat exchanger, 110 gas valve, 111 orifice, 112 venturi, 113 blower, 114 chamber, 115 burner, 116 spark plug, 120 duct, 130, 140 piping, 150 bypass piping, 160 three-way valve, 200 hot water device, DR1 first direction, DR2 second direction, DR3 third direction.

Claims (6)

a case having a first side wall and a second side wall opposed to each other with a gap in a first direction, and a third side wall and a fourth side wall opposed to each other with a gap in a second direction perpendicular to the first direction;
a first heat exchange unit and a second heat exchange unit that are housed in the case and are arranged to overlap each other in a third direction perpendicular to the first direction and the second direction;
A brazing filler receiving portion is provided.
The second heat exchange unit is located above the first heat exchange unit,
the brazing filler receptacle is located within the case,
The first heat exchange unit has a plurality of first heat transfer tubes arranged in a stacked manner along the second direction,
Each of the first heat transfer tubes includes a plurality of straight tube portions, a plurality of first curved tube portions, and a plurality of second curved tube portions,
The straight pipe portions are arranged in a row along the third direction,
Each of the straight pipe portions extends along the first direction,
each of the first curved pipe portions connects one end in the first direction of two of the straight pipe portions adjacent to each other in the third direction;
each of the plurality of second curved pipe sections is located at a position other than both ends in the third direction and connects the other ends in the first direction of two of the plurality of straight pipe sections adjacent to each other in the third direction;
the other end in the first direction of each of the straight pipe portions located at both ends in the third direction is supported by the second side wall,
The second heat exchange unit has a plurality of second heat transfer tubes extending along the first direction,
Both ends of each of the plurality of second heat transfer tubes in the first direction are brazed to the first side wall and the second side wall, respectively;
The brazing filler receptacle is located between the first heat exchange portion and the second heat exchange portion in the third direction and extends along the second direction so as to overlap the first curved pipe portions in the first direction. a support plate attached to the first side wall and supporting one end side of the first heat transfer tubes in the first direction along the third direction,
The heat exchanger according to claim 1 , wherein the brazing filler metal receiving portion is integrally provided at an end portion of the support plate on the second heat exchange portion side in the third direction. The heat exchanger according to claim 1 or 2, wherein the brazing filler receptacle has a through hole formed therein that penetrates the brazing filler receptacle along the third direction. The heat exchanger according to claim 3, wherein a standing wall is formed around the periphery of the through hole and extends toward the second heat exchange section along the third direction. The heat exchanger according to any one of claims 1 to 4, wherein the brazing material receiving portion is inclined away from the second heat exchange portion from one of the third side wall and the fourth side wall toward the other of the third side wall and the fourth side wall. The heat exchanger according to any one of claims 1 to 5,
a combustion device that supplies combustion gas to the heat exchanger.

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