Heat exchanger and hot water device

Abstract

Provided is a heat exchanger and a hot water device that can inhibit a heat transfer tube of a lower heat exchange portion from being joined to a housing by a solder that has fallen from an upper heat exchange portion during brazing. The heat exchanger includes a housing including a first side wall and a second side wall that face each other with a space in a first direction, and a third side wall and a fourth side wall that face each other with a space in a second direction orthogonal to the first direction; a first heat exchange portion and a second heat exchange portion housed in the housing and arranged in a third direction orthogonal to the first direction and the second direction; and a brazing receiving portion.

Description

TECHNICAL FIELD

[0001] The present application relates to a heat exchanger and a hot water device. BACKGROUND

[0002] A heat exchanger is described in Patent Literature 1 (Japanese Patent Real Publication No. 62-36027). The heat exchanger described in Patent Literature 1 includes a housing, a heat transfer pipe, a first bracket, and a second bracket. The housing includes a first side wall and a second side wall which are spaced apart from each other, and a third side wall and a fourth side wall which are spaced apart from each other.

[0003] The heat transfer pipe is a serpentine pipe. The heat transfer pipe includes a plurality of straight pipe portions which extend in a direction in which the first side wall and the second side wall face each other. The both ends of the straight pipe portions are supported by the first bracket and the second bracket, respectively. The heat transfer pipe (the straight pipe portions) is disposed inside the housing by brazing the first bracket and the second bracket to outer wall surfaces of the first side wall and the second side wall, respectively.

[0004] A heat exchanger is described in Patent Literature 2 (Japanese Patent Application Laid-Open No. 7-65863). The heat exchanger described in Patent Literature 2 includes a housing, a heat transfer pipe, and a fin. The housing includes a first side wall and a second side wall which are spaced apart from each other, and a third side wall and a fourth side wall which are spaced apart from each other. The heat transfer pipe is a serpentine pipe. The heat transfer pipe includes a plurality of straight pipe portions which extend in a direction in which the first side wall and the second side wall face each other. The both ends of the straight pipe portions are supported by the first side wall and the second side wall, respectively. The fin is mounted to the straight pipe portions by brazing.

[0005] [Related Art Documents]

[0006] [Patent Literature]

[0007] [Patent Literature 1] Japanese Patent Real Publication No. 62-36027

[0008] [Patent Literature 2] Japanese Patent Application Laid-Open No. 7-65863 SUMMARY

[0009] [Problems to be Solved by the Invention]

[0010] The heat exchanger described in Patent Literature 1 and the heat exchanger described in Patent Literature 2 do not include a plurality of heat exchange portions which are disposed in a stacked manner in the up-down direction. Therefore, in the heat exchanger described in Patent Literature 1 and the heat exchanger described in Patent Literature 2, it is not assumed that, when brazing is performed, brazing filler metal falls from a heat exchange portion located above and adheres to a heat exchange portion located below. If the heat transfer pipe of the heat exchange portion located below is joined to the housing by the brazing filler metal which has fallen from the heat exchange portion located above, there is a risk that damage to the heat transfer pipe occurs in the joint portion.

[0011] The present application has been made in view of the problems of the related art as described above. More specifically, the present application provides a heat exchanger and a hot water device capable of inhibiting a brazing material dropped from an upper heat exchange portion from joining a heat transfer tube and a case of a lower heat exchange portion.

[0012] [Technical means for solving the problem]

[0013] The heat exchanger of the present application includes a case including a first side wall and a second side wall facing each other with a space in a first direction, and a third side wall and a fourth side wall facing each other with a space in a second direction orthogonal to the first direction; a first heat exchange portion and a second heat exchange portion housed in the case and arranged so as to overlap in a third direction orthogonal to the first and second directions; and a brazing receiving portion. The first heat exchange portion includes a plurality of first heat transfer tubes arranged so as to overlap in the second direction. The plurality of first heat transfer tubes each include a plurality of straight tube portions, a plurality of first bent tube portions, and a plurality of second bent tube portions. The plurality of straight tube portions are arranged in a column in the third direction. The plurality of straight tube portions each extend in the first direction. The plurality of first bent tube portions each connect one end in the first direction of two of the plurality of straight tube portions adjacent in the third direction. The plurality of second bent tube portions each connect the other end in the first direction of the two of the plurality of straight tube portions adjacent in the third direction, and are located other than the two ends in the third direction. The other end in the first direction of each of the plurality of straight tube portions located at the two ends in the third direction is supported by the second side wall. The second heat exchange portion includes a plurality of second heat transfer tubes each extending in the first direction. The two ends in the first direction of each of the plurality of second heat transfer tubes are brazed to the first side wall and the second side wall, respectively. The brazing receiving portion is located between the first heat exchange portion and the second heat exchange portion in the third direction, and extends in the second direction so as to overlap the plurality of first bent tube portions in the first direction.

[0014] The heat exchanger can further include a support plate mounted to the first side wall and supporting one end side in the first direction of the plurality of first heat transfer tubes in the third direction. The brazing receiving portion can be integrally provided at an end portion of the support plate on the second heat exchange portion side in the third direction.

[0015] In the heat exchanger, a through-hole can be formed in the brazing receiving portion so as to pass through the brazing receiving portion in the third direction.

[0016] In the heat exchanger, a standing wall can be formed around the through-hole so as to extend toward the second heat exchange portion side in the third direction.

[0017] In the heat exchanger, the brazing receiving portion can be inclined so as to be farther from the second heat exchange portion as it goes 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.

[0018] The hot-water device of the present application includes the heat exchanger, and a combustion device that supplies combustion gas to the heat exchanger.

[0019] [Effects of the Invention]

[0020] According to the heat exchanger and the hot-water device of the present application, the heat transfer tubes of the lower heat exchange portion are prevented from being joined to the housing by the brazing material dropped from the upper heat exchange portion when the heat exchanger is brazed. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a first perspective view of the heat exchanger 100.

[0022] Figure 2 is a second perspective view of the heat exchanger 100.

[0023] Figure 3 is an elevation view of the heat exchanger 100.

[0024] Figure 4 is Figure 3 a cross-sectional view at IV-IV of

[0025] Figure 5 is Figure 4 a cross-sectional view at V-V of

[0026] Figure 6 is Figure 5 an enlarged view of

[0027] Figure 7 is a perspective view of the support plate 50 of the heat exchanger 100.

[0028] Figure 8 is a schematic view of the hot-water device 200.

[0029] [Explanation of Symbols]

[0030] 10: housing

[0031] 11: first side wall

[0032] 12: second side wall

[0033] 13: third side wall

[0034] 13a: exhaust port

[0035] 14: fourth side wall

[0036] 15: bottom wall

[0037] 16, 17: opening portion

[0038] 20: first heat exchange portion

[0039] 21: first heat transfer pipe

[0040] 22, 22a, 22b, 22c: straight pipe portion

[0041] 23: first bent pipe portion

[0042] 24: second bent pipe portion

[0043] 25, 26: header

[0044] 27: water inlet

[0045] 28: water outlet

[0046] 30: second heat exchange portion

[0047] 31: main pipe

[0048] 32, 32a, 32aa, 32ab, 32b, 32ba, 32bb: second heat transfer pipe

[0049] 32c: fin

[0050] 33, 34, 35, 36, 37, 38, 39, 40, 41: connection pipe

[0051] 42: water outlet

[0052] 50: support plate

[0053] 51: support portion

[0054] 51a: opening portion

[0055] 52: brazing receiving portion

[0056] 52a: through hole

[0057] 52b: vertical wall

[0058] 100: heat exchanger

[0059] 110: gas valve

[0060] 111: orifice

[0061] 112: venturi

[0062] 113: air supply device

[0063] 114: chamber

[0064] 115: burner

[0065] 116: squib

[0066] 120: conduit

[0067] 130, 140: pipe

[0068] 150: bypass pipe

[0069] 160: three-way valve

[0070] 200: hot water device

[0071] DR1: first direction

[0072] DR2: second direction

[0073] DR3: third direction DETAILED DESCRIPTION

[0074] Embodiments of the present application will be described in detail with reference to the accompanying drawings. In the following drawings, the same or corresponding portions are denoted by the same reference numerals, and repetitive explanations will not be repeated.

[0075] (Structure of heat exchanger of embodiment)

[0076] The structure of the heat exchanger (provided as "heat exchanger 100") of the embodiment will be described below.

[0077] 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 an elevation view of the heat exchanger 100. Figure 4 is Figure 3 is a sectional view at IV-IV of Figure 5 is a sectional view at V-V of Figure 4 In Figure 4 , the illustration of the housing 10, the first heat transfer pipes 21, and the support plate 50 is omitted. Figure 6 is Figure 5 is an enlarged view of Figure 7 is a perspective view of the support plate 50 of the heat exchanger 100. As Figures 1 to 7 indicated, the heat exchanger 100 includes the housing 10, the first heat exchange section 20, the second heat exchange section 30, and the support plate 50.

[0078] The housing 10 includes 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 are spaced apart from each other and face each other. The direction in which the first side wall 11 and the second side wall 12 face each other is provided as a first direction DR1. The third side wall 13 and the fourth side wall 14 are spaced apart from each other and face each other. The direction in which the third side wall 13 and the fourth side wall 14 face each other is provided as a second direction DR2. The second direction DR2 is orthogonal to the first direction DR1. Although not illustrated, an exhaust port 13a is formed in the third side wall 13. The exhaust port 13a penetrates the third side wall 13 in the thickness direction.

[0079] A direction orthogonal to the first direction DR1 and the second direction DR2 is a third direction DR3. One end of the housing 10 in the third direction DR3 includes an opening portion 16, and the other end in the third direction DR3 includes an opening portion 17. The opening portion 17 is plugged by a bottom wall 15.

[0080] The first heat exchange portion 20 and the second heat exchange portion 30 are arranged so as to overlap in the third direction DR3. The second heat exchange portion 30 is located closer to the opening portion 16 than the first heat exchange portion 20 in the third direction DR3. The first heat exchange portion 20 functions as a secondary heat exchanger, and the second heat exchange portion 30 functions as a primary heat exchanger.

[0081] The first heat exchange portion 20 includes a plurality of first heat transfer pipes 21. The first heat transfer pipe 21 is a serpentine pipe that meanders in a plane orthogonal to the second direction DR2. The plurality of first heat transfer pipes 21 are arranged so as to overlap in the second direction DR2. Two first heat transfer pipes 21 adjacent in the second direction DR2 are offset in the third direction DR3. The first heat transfer pipe 21 is formed of, for example, stainless steel.

[0082] The first heat transfer pipe 21 includes a plurality of straight pipe portions 22, a plurality of first bent pipe portions 23, and a plurality of second bent pipe portions 24. The straight pipe portion 22 extends along the first direction DR1. The plurality of straight pipe portions 22 are arranged in a row along the third direction DR3.

[0083] Portions of the plurality of straight pipe portions 22 located at both ends in the third direction DR3 are respectively set as a straight pipe portion 22a and a straight pipe portion 22b. The straight pipe portion 22a is located closer to the opening portion 17 than the straight pipe portion 22a in the third direction DR3. A portion of the plurality of straight pipe portions 22 other than the portions located at both ends in the third direction DR3 is set as a straight pipe portion 22c.

[0084] One end (an end on the first side wall 11 side) of two straight pipe portions 22 adjacent in the third direction DR3 in the first direction DR1 is connected by the first bent pipe portion 23. The other end (an end on the second side wall 12 side) of the straight pipe portion 22a and the other end of the straight pipe portion 22b in the first direction DR1 are supported by the second side wall 12. From another viewpoint, the first heat transfer pipe 21 is cantilevered by the housing 10 (the second side wall 12). The other ends of two straight pipe portions 22c adjacent in the third direction DR3 in the first direction DR1 are connected by the second bent pipe portion 24.

[0085] 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 portion 22a in the first direction DR1 is connected to the header 25. The header 25 is formed with a water inlet 27 that communicates with the inside of the header 25. The other end of the straight pipe portion 22b in the first direction DR1 is connected to the header 26. The header 26 is formed with a water outlet 28 that communicates with the inside of the header 26.

[0086] The second heat exchange portion 30 includes a plurality of main tubes 31 and a plurality of second heat transfer tubes 32. The plurality of main tubes 31 are located closer to the opening portion 16 than the plurality of second heat transfer tubes 32 in the third direction DR3. The main tubes 31 and the second heat transfer tubes 32 are formed of, for example, stainless steel.

[0087] The plurality of main tubes 31 are arranged in overlap along the third direction DR3. The main 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 main 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.

[0088] One end of the main tube 31 and the other end of the main tube 31 are supported by the second side wall 12. The one end of the main tube 31 is located on the third side wall 13 side, and the other end of the main tube 31 is located on the fourth side wall 14 side. The one end of the main tube 31 located closest to the opening portion 16 in the third direction DR3 is connected to the water outlet 28 by a connecting pipe 33. The other end of a certain main tube 31 is connected to the one end of another main tube 31 adjacent to the certain main tube 31 in the third direction DR3 by a connecting pipe 34.

[0089] The second heat transfer tubes 32 extend 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. The attachment is performed by brazing.

[0090] The plurality of second heat transfer tubes 32 are arranged in a plurality of rows along the second direction DR2. The plurality of second heat transfer tubes 32 include, for example, a plurality of second heat transfer tubes 32a arranged in a row along the second direction DR2, and a plurality of second heat transfer tubes 32b (not shown) arranged in a row along the second direction DR2. The second heat transfer tubes 32a are located closer to the opening portion 16 than the second heat transfer tubes 32b in the third direction DR3.

[0091] A portion of the plurality of second heat transfer pipes 32a located closest to the fourth side wall 14 side is provided as a second heat transfer pipe 32aa. A portion of the plurality of second heat transfer pipes 32a located closest to the third side wall 13 side is provided as a second heat transfer pipe 32ab. A portion of the plurality of second heat transfer pipes 32b located closest to the fourth side wall 14 side is provided as a second heat transfer pipe 32ba. A portion of the plurality of second heat transfer pipes 32b located closest to the third side wall 13 side is provided as a second heat transfer pipe 32bb.

[0092] One end in the first direction DR1 of two second heat transfer pipes 32a adjacent in the second direction DR2 is connected by a connection pipe 35. The other end in the first direction DR1 of the two second heat transfer pipes 32a adjacent in the second direction DR2 is connected by a connection pipe 36. However, the other end in the first direction DR1 of the second heat transfer pipe 32aa is connected to the other end of the main pipe 31 farthest from the mouth portion 16 in the third direction DR3 by a connection pipe 37. In addition, one end in the first direction DR1 of the second heat transfer pipe 32ab is connected to one end in the first direction DR1 of the second heat transfer pipe 32bb by a connection pipe 38.

[0093] One end in the first direction DR1 of two second heat transfer pipes 32b adjacent in the second direction DR2 is connected by a connection pipe 39. However, one end of a connection pipe 40 is connected to one end of the second heat transfer pipe 32ba. The other end in the first direction DR1 of the two second heat transfer pipes 32b adjacent in the second direction DR2 is connected by a connection pipe 41. However, as described above, one end in the first direction DR1 of the second heat transfer pipe 32bb is connected to one end in the first direction DR1 of the second heat transfer pipe 32ab by the connection pipe 38. The other end of the connection pipe 40 becomes a water outlet 42.

[0094] A plurality of fins 32c are installed in the second heat transfer pipe 32. The installation of the fins 32c is performed by brazing. The fins 32c are formed of, for example, stainless steel. One main surface of the fins 32c faces the first side wall 11, and the other main surface of the fins 32c faces the second side wall 12. The plurality of fins 32c are arranged at intervals in the first direction DR1. Furthermore, in the drawing, only a part of the fins 32c is illustrated, and the remaining fins 32c are omitted from the illustration.

[0095] A support plate 50 is installed to the inner wall surface of the first side wall 11. The installation of the support plate 50 to the first side wall 11 is performed by, for example, spot welding. The support plate 50 includes a support portion 51 and a brazing receiving portion 52. The support plate 50 is formed of, for example, stainless steel. The support plate 50 is twice rotationally symmetrical about the center of the support portion 51 when viewed in the first direction DR1. From another viewpoint, the support plate 50 can be used equally even if it is rotated by 180° about the center.

[0096] The support portion 51 faces the first side wall 11 with an interval in the first direction DR1. The support portion 51 is plate-shaped. The support portion 51 supports one end side of the straight pipe portion 22 in the first direction DR1. The support is performed along the third direction DR3. A plurality of opening portions 51a are formed in the support portion 51. The opening portions 51a penetrate the support portion 51 along the thickness direction. The one end side of the straight pipe portion 22 in the first direction DR1 is supported by the edge of the opening portion 51a. Further, the edge of the opening portion 51a is wavy in cooperation with the arrangement of the straight pipe portion 22.

[0097] The brazing receiving portion 52 is formed by bending the end portion of the support plate 50 on the second heat exchange portion 30 side toward the first side wall 11 side. 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 portion 20 and the second heat exchange portion 30 in the third direction DR3. The brazing receiving portion 52 is located at a position overlapping the first bent pipe portion 23 in the first direction DR1. The brazing receiving portion 52 can also overlap the one end side of the straight pipe portion 22 in the first direction DR1.

[0098] The brazing receiving portion 52 extends along the second direction DR2. The brazing receiving portion 52 extends in such a manner as to reach a position closer to the third side wall 13 than the first heat transfer pipe 21 located closest to the third side wall 13 side in the second direction, and to reach a position closer to the fourth side wall 14 than the first heat transfer pipe 21 located closest to the fourth side wall 14 side in the second direction. The brazing receiving portion 52 is inclined in such a manner as to be away from the second heat exchange portion 30 as it goes from the fourth side wall 14 side toward the third side wall 13 side. The brazing receiving portion 52 can also be inclined in such a manner as to be away from the second heat exchange portion 30 as it goes from the third side wall 13 side toward the fourth side wall 14 side.

[0099] A through-hole 52a can also be formed in the brazing receiving portion 52. The through-hole 52a penetrates the brazing receiving portion 52 along the thickness direction. The through-hole 52a is formed, for example, at a position partially overlapping the straight pipe portion 22 in the first direction DR1, and partially overlapping the first bent pipe portion 23 in the first direction DR1. However, the through-hole 52a does not overlap the portion of the first bent pipe portion 23 where the distance from the first side wall 11 is the shortest. The through-hole 52a extends along the second direction DR2. A standing wall 52b can also be formed in the periphery of the through-hole 52a. The standing wall 52b stands up toward the second heat exchange portion 30 side along the third direction DR3.

[0100] (Structure of the hot-water supply device of the embodiment)

[0101] Hereinafter, the structure of the hot-water supply device (provided as "hot-water supply device 200") of the embodiment will be described.

[0102] Figure 8 is a schematic view of a warm water device 200. As shown in Figure 8 the warm water device 200 includes the heat exchanger 100. The warm water device 200 further includes 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.

[0103] By setting the gas valve 110 to an open state, 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 will be referred to as a mixed gas). The mixed gas is supplied to the burner 115 via the chamber 114 by the blower 113.

[0104] The mixed gas supplied to the burner 115 is ignited and burned by causing the ignition plug 116 to generate a spark. Thus, combustion gas is generated in the burner 115. The burner 115 is installed to the heat exchanger 100. More specifically, the burner 115 is installed to the opening portion 16. Therefore, the combustion gas generated by the burner 115 flows in the inside of the housing 10 from the opening portion 16 side toward the opening portion 17 side.

[0105] The pipe 130 is connected to a tap water pipe at one end thereof. The pipe 130 is connected to the water inlet 27 at the other end thereof. The pipe 140 is connected to the water outlet 42 at one end thereof. The pipe 140 is connected to a hot water supply tap (not shown) at the other end thereof.

[0106] The bypass pipe 150 is connected to the pipe 130 at one end thereof and is connected to the pipe 140 at the other end thereof. The connection of the bypass pipe 150 to the pipe 140 is performed by the 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.

[0107] The water supplied from one end of the pipe 130 flows in the pipe 130 and is supplied to the first heat exchange portion 20 (the first heat transfer pipe 21). The water supplied to the first heat exchange portion 20 is warmed by performing heat exchange with the combustion gas. The water flowing in the first heat exchange portion 20 flows in the connection pipe 33 and is supplied to the second heat exchange portion 30 (the main pipe 31 and the second heat transfer pipe 32).

[0108] The water supplied to the second heat exchanging section 30 is warmed by heat exchange with the combustion gas. The water flowing in the second heat exchanging section 30 flows in the pipe 140 and hot water is supplied from the hot water supply tap. Further, the temperature of the water (hot water) supplied from the hot water supply tap is adjusted by mixing the water flowing in the second heat exchanging section 30 with tap water supplied from the bypass pipe 150 in the pipe 140. The combustion gas which has undergone heat exchange with the water flowing in the first heat exchanging section 20 and the second heat exchanging section 30 is discharged to the outside from the duct 120.

[0109] (EFFECTS OF THE HEAT EXCHANGER OF THE EMBODIMENT)

[0110] Next, the effects of the heat exchanger 100 will be described.

[0111] In the heat exchanger 100, a plurality of heat exchanging sections (the first heat exchanging section 20 and the second heat exchanging section 30) are housed in the housing 10, and therefore brazing is performed uniformly for the heat exchanger 100. At the time of the brazing, the heat exchanger 100 is arranged in the furnace so that the third direction DR3 coincides with the vertical direction.

[0112] In the case where the brazing receiving section 52 is not provided, at the time of the brazing, the brazing material for mounting the second heat transferring pipe 32 to the first side wall 11 can hang down, and the first bent pipe section 23 can sometimes be joined to the inner wall surface of the first side wall 11 by the brazing material hanging down. If the first bent pipe section 23 is joined to the inner wall surface of the first side wall 11 by the brazing material hanging down, the portion of the first bent pipe section 23 joined to the inner wall surface of the first side wall 11 by the brazing material can sometimes be broken by the water hammer phenomenon when the water flows in the first bent pipe section 23.

[0113] However, in the heat exchanger 100, the brazing receiving section 52 is provided. Therefore, the brazing material hanging down from the second heat transferring pipe 32 is received by the brazing receiving section 52. As a result, according to the heat exchanger 100, the joining between the first bent pipe section 23 and the inner wall surface of the first side wall 11 caused by the brazing material hanging down from the heat exchanging section (the second heat exchanging section 30) located above is prevented, and further, the breakage of the first bent pipe section 23 when the water flows is suppressed.

[0114] Further, the first heat transferring pipe 21 is cantilevered by the second side wall 12. Therefore, the first heat transferring pipe 21 is softened by the temperature rise at the time of the brazing, and one end side in the first direction DR1 of the straight pipe section 22 not supported by the first side wall 11 is deflected toward the lower side.

[0115] In the heat exchanger 100, one end side in the first direction DR1 of the straight pipe section 22 is supported by the support section 51 along the third direction DR3, and therefore even if the first heat transferring pipe 21 is softened at the time of the brazing, one end side in the first direction DR1 of the straight pipe section 22 is difficult to be deflected toward the lower side.

[0116] When the through-hole 52a is formed in the brazing 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 that is caused by the provision of the brazing receiving portion 52. When the standing wall 52b is formed in the brazing receiving portion 52, it is possible to suppress the case where the brazing material received by the brazing receiving portion 52 passes through the through-hole 52a and falls on the first bend portion 23, thereby joining the first bend portion 23 to the inner wall surface of the first side wall 11.

[0117] In the case where the brazing receiving portion 52 is inclined away from the second heat exchange portion 30 as it goes from the fourth side wall 14 side toward the third side wall 13 side (from the third side wall 13 side toward the fourth side wall 14 side), the brazing material received by the brazing receiving portion 52 moves in conjunction with the inclination and falls on the bottom wall 15 in the vicinity of the third side wall 13 (the fourth side wall 14) where the first heat exchange tube 21 is not arranged. In this way, the brazing receiving portion can handle the brazing material that has dropped down in a manner that does not cause adverse effects in the case where the brazing receiving portion 52 is inclined away from the second heat exchange portion 30 as it goes from the fourth side wall 14 side toward the third side wall 13 side (from the third side wall 13 side toward the fourth side wall 14 side).

[0118] As described above, the embodiments of the present application have been described, but various modifications can be made to the embodiments. In addition, the scope of the present application is not limited to the described embodiments. The scope of the present application is represented by the claims, and is intended to include all modifications within the meaning and range equivalent to the claims.

[0119] [Industrial Applicability]

[0120] The present embodiment is particularly advantageously applied to a heat exchanger that includes a plurality of heat exchange portions in a housing and a hot-water supply device that includes the heat exchanger.

Claims

1. A heat exchanger, comprising: The housing includes a first sidewall and a second sidewall that are spaced apart and face each other in a first direction, and a third sidewall and a fourth sidewall that are spaced apart and face each other in a second direction orthogonal to the first direction. A first heat exchange unit and a second heat exchange unit are housed within the housing and are arranged overlappingly in a third direction orthogonal to the first and second directions, with the first heat exchange unit positioned below the second heat exchange unit in this third direction; and Brazing finish The first heat exchange section includes a plurality of first heat transfer tubes arranged overlappingly along the second direction. The plurality of first heat transfer tubes each include a plurality of straight tube sections, a plurality of first bend tube sections, and a plurality of second bend tube sections. The plurality of straight pipe sections are arranged in columns along the third direction. The plurality of straight pipe sections extend along the first direction, respectively. The plurality of first bends are respectively connected to one end of two of the plurality of straight sections adjacent to each other in the third direction in the first direction. The plurality of second bends are located outside the two ends of the plurality of straight sections in the third direction, and connect the other ends of two of the plurality of straight sections adjacent to each other in the third direction in the first direction. The other end of each of the plurality of straight tube sections located at both ends in the third direction is supported by the second sidewall in the first direction. The second heat exchange section includes a plurality of second heat transfer tubes extending along the first direction. The two ends of each of the plurality of second heat transfer tubes in the first direction are respectively brazed to the first sidewall and the second sidewall. The brazed junction is located between the first heat exchange section and the second heat exchange section in the third direction, and extends along the second direction in a manner that overlaps with the plurality of first bends in the first direction. A through hole is formed in the brazed weld junction, extending through the brazed weld junction along the third direction.

2. The heat exchanger according to claim 1 further includes a support plate. The support plate is mounted on the first sidewall and is located at one end of the first direction supporting the plurality of first heat transfer tubes along the third direction. The brazing junction is integrally disposed at the end of the support plate on the third-direction side of the second heat exchange section.

3. The heat exchanger according to claim 1 or 2, wherein, A vertical wall extending toward the second heat exchange section is formed around the periphery of the through hole.

4. The heat exchanger according to claim 1 or 2, wherein, The brazed section is inclined in such a way that it moves away from the second heat exchange section from one of the third sidewall and the fourth sidewall toward the other of the third sidewall and the fourth sidewall.

5. The heat exchanger according to claim 3, wherein, The brazed section is inclined in such a way that it moves away from the second heat exchange section from one of the third sidewall and the fourth sidewall toward the other of the third sidewall and the fourth sidewall.

6. A water warming device, comprising: The heat exchanger as described in any one of claims 1 to 4; as well as A combustion device supplies combustion gases to the heat exchanger.

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