CN114659272A

CN114659272A - Heat exchanger and water heating device

Info

Publication number: CN114659272A
Application number: CN202111430052.9A
Authority: CN
Inventors: 堀内健吾
Original assignee: Noritz Corp
Current assignee: Noritz Corp
Priority date: 2020-12-07
Filing date: 2021-11-29
Publication date: 2022-06-24
Also published as: JP2022090274A

Abstract

The invention provides a heat exchanger and a water heater, which can prevent brazing filler metal falling from a heat exchange part positioned above from jointing a heat transfer pipe of a heat exchange part positioned below with a shell during brazing. The heat exchanger includes: a housing including a first sidewall and a second sidewall facing each other with a space therebetween in a first direction, and a third sidewall and a fourth sidewall facing each other with a space therebetween in a second direction orthogonal to the first direction; a first heat exchange unit and a second heat exchange unit housed in the case and arranged to overlap in a third direction orthogonal to the first direction and the second direction; and a braze receiving portion.

Description

Heat exchanger and water heating device

Technical Field

The present invention relates to a heat exchanger and a water heater.

Background

Patent document 1 (japanese patent koku publication No. 62-36027) describes a heat exchanger. The heat exchanger described in patent document 1 includes: the heat exchanger comprises a shell, a heat transfer pipe, a first bracket and a second bracket. The housing includes first and second sidewalls spaced apart to face each other, and third and fourth sidewalls spaced apart to face each other.

The heat transfer tube is a serpentine tube. The heat transfer pipe includes a plurality of straight pipe portions extending in a direction in which the first side wall and the second side wall face each other. The straight tube portion has both ends supported by the first bracket and the second bracket, respectively. The heat transfer pipe (straight pipe portion) is disposed inside the casing 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 (japanese patent application laid-open No. 7-65863) describes a heat exchanger. The heat exchanger described in patent document 2 includes: a casing, a heat transfer pipe, and a heat radiation fin (fin). The housing includes first and second sidewalls spaced apart to face each other, and third and fourth sidewalls spaced apart to face each other. The heat transfer tube is a serpentine tube. The heat transfer pipe includes a plurality of straight pipe portions extending in a direction in which the first side wall and the second side wall face each other. The straight tube portion has both ends supported by the first side wall and the second side wall, respectively. The fins are attached to the straight tube portions by brazing.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent Kokoku publication Sho 62-36027

[ patent document 2] Japanese patent publication No. Hei 7-65863

Disclosure of Invention

[ problems to be solved by the invention ]

The heat exchanger described in patent document 1 and the heat exchanger described in patent document 2 do not include a plurality of heat exchange portions arranged to overlap in the vertical direction. 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 falls from the heat exchange portion located above and adheres to the heat exchange portion located below at the time of brazing. When the heat transfer tubes of the heat exchange portion located below are joined to the casing by the brazing filler metal falling from the heat exchange portion located above, the heat transfer tubes may be damaged in the joined portion.

The present invention has been made in view of the above-mentioned problems of the prior art. More specifically, the present invention provides a heat exchanger and a water heater capable of suppressing brazing filler metal falling from an upper heat exchange portion from joining a heat transfer pipe of a lower heat exchange portion to a casing during brazing.

[ means for solving problems ]

The heat exchanger of the present invention comprises: a housing including a first sidewall and a second sidewall facing each other with a space therebetween in a first direction, and a third sidewall and a fourth sidewall facing each other with a space therebetween in a second direction orthogonal to the first direction; a first heat exchange unit and a second heat exchange unit housed in the case and arranged to overlap in a third direction orthogonal to the first direction and the second direction; and a braze receiving portion. The first heat exchange portion includes a plurality of first heat transfer pipes arranged to overlap in the second direction. The plurality of first heat transfer pipes respectively include a plurality of straight pipe portions, a plurality of first bent pipe portions, and a plurality of second bent pipe portions. The plurality of straight tube portions are arranged in a row along the third direction. The plurality of straight tube portions extend in the first direction. The plurality of first bent pipe portions connect one end of each of two first direction straight pipe portions adjacent to each other in the third direction. The plurality of second bent pipe portions are located outside both ends in the third direction, respectively, and connect the other ends in two first directions of the plurality of straight pipe portions adjacent in the third direction. The other end in the first direction of each of the plurality of straight tube portions located at both ends in the third direction is supported by the second side wall. The second heat exchange portion includes a plurality of second heat transfer pipes extending in the first direction. Both ends of each of the plurality of second heat transfer tubes in the first direction are brazed to the first sidewall and the second sidewall, respectively. The brazing receiving portion is located between the first heat exchanging portion and the second heat exchanging portion in the third direction, and extends along the second direction in such a manner as to overlap with the plurality of first bent portions in the first direction.

The heat exchanger may further include a support plate mounted to the first sidewall and supporting one end side of the plurality of first heat transfer pipes in the first direction along the third direction. The brazing receiving part may also be integrally provided to an end of the second heat exchanging part side in the third direction of the support plate.

In the heat exchanger, the brazing receiving portion may be formed with a through hole penetrating the brazing receiving portion in the third direction.

In the heat exchanger, a standing wall extending toward the second heat exchange unit side in the third direction may be formed on a peripheral edge of the through hole.

In the heat exchanger, the brazing receiving portion may be inclined away from the second heat exchanging portion as going from one of the third and fourth side walls toward the other of the third and fourth side walls.

The water heating device of the present invention comprises: the heat exchanger; and a combustion device that supplies combustion gas to the heat exchanger.

[ Effect of the invention ]

According to the heat exchanger and the water heater of the present invention, when brazing the heat exchanger, the heat transfer tubes of the heat exchange portion located below are prevented from being joined to the case by the brazing filler metal dropped from the heat exchange portion located above.

Drawings

Fig. 1 is a first perspective view of the heat exchanger 100.

Fig. 2 is a second perspective view of the heat exchanger 100.

Fig. 3 is a front view of the heat exchanger 100.

Fig. 4 is a cross-sectional view at IV-IV of fig. 3.

Fig. 5 is a sectional view at V-V of fig. 4.

Fig. 6 is an enlarged view of fig. 5.

Fig. 7 is a perspective view of the support plate 50 of the heat exchanger 100.

Fig. 8 is a schematic view of the water warming apparatus 200.

[ description of symbols ]

10: shell body

11: first side wall

12: second side wall

13: third side wall

13 a: exhaust port

14: the fourth side wall

15: bottom wall

16. 17: opening part

20: first heat exchange part

21: first heat transfer pipe

22. 22a, 22b, 22 c: straight pipe section

23: first elbow part

24: second elbow pipe part

25. 26: collecting pipe

27: water inlet

28: water outlet

30: second heat exchange part

31: main body pipe

32. 32a, 32aa, 32ab, 32b, 32ba, 32 bb: second heat transfer pipe

32c, the ratio of: heat sink

33. 34, 35, 36, 37, 38, 39, 40, 41: connecting pipe

42: water outlet

50: supporting plate

51: supporting part

51 a: opening part

52: solder receiving part

52 a: through hole

52 b: vertical wall

100: heat exchanger

110: gas valve

111: throttle hole

112: venturi tube

113: air supply device

114: chamber

115: burner apparatus

116: sparking plug

120: catheter tube

130. 140: piping

150: bypass piping

160: three-way valve

200: water heating device

DR 1: a first direction

DR 2: second direction

DR 3: third direction

Detailed Description

The embodiments of the present invention 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 overlapping description will not be repeated.

(Structure of Heat exchanger of embodiment)

The structure of the heat exchanger (referred to as "heat exchanger 100") according to the embodiment will be described below.

Fig. 1 is a first perspective view of the heat exchanger 100. Fig. 2 is a second perspective view of the heat exchanger 100. Fig. 3 is a front view of the heat exchanger 100. Fig. 4 is a sectional view at IV-IV of fig. 3. Fig. 5 is a sectional view at V-V of fig. 4. In fig. 4, illustration of the casing 10, the first heat transfer pipe 21, and the support plate 50 is omitted. Fig. 6 is an enlarged view of fig. 5. Fig. 7 is a perspective view of the support plate 50 of the heat exchanger 100. As shown in fig. 1 to 7, the heat exchanger 100 includes: a case 10, a first heat exchange part 20, a second heat exchange part 30, and a support plate 50.

The housing 10 includes: a first sidewall 11, a second sidewall 12, a third sidewall 13, a fourth sidewall 14, and a bottom wall 15. The first side wall 11 and the second side wall 12 face each other with a space therebetween. The direction in which the first side wall 11 and the second side wall 12 face each other is set as a first direction DR 1. The third side wall 13 and the fourth side wall 14 face each other with a space therebetween. A direction in which the third sidewall 13 and the fourth sidewall 14 face each other is set as a second direction DR 2. The second direction DR2 is orthogonal to the first direction DR 1. 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 in the thickness direction.

A direction orthogonal to the first direction DR1 and the second direction DR2 is referred to as a third direction DR 3. 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 17 is closed by the bottom wall 15.

The first heat exchange portion 20 and the second heat exchange portion 30 are arranged to overlap in the third direction DR 3. 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 DR 3. The first heat exchange unit 20 functions as a secondary heat exchanger, and the second heat exchange unit 30 functions as a primary heat exchanger.

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 DR 2. The plurality of first heat transfer pipes 21 are arranged to overlap in the second direction DR 2. The positions of the two first heat transfer pipes 21 adjacent in the second direction DR2 are deviated in the third direction DR 3. The first heat transfer pipe 21 is formed of, for example, stainless steel.

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 tube portion 22 extends in the first direction DR 1. The plurality of straight tube portions 22 are arranged in a row along the third direction DR 3.

The

straight tube portions

22a and 22b are portions of the plurality of straight tube portions 22 located at both ends in the third direction DR 3. The straight tube portions 22a are located closer to the opening portion 17 than the straight tube portions 22a in the third direction DR 3. The straight tube portions 22c are portions of the plurality of straight tube portions 22 other than both ends in the third direction DR 3.

One ends (ends on the first side wall 11 side) of two of the straight pipe portions 22 adjacent in the third direction DR3 in the first direction DR1 are connected by the first bent pipe portion 23. The other end (end on the second side wall 12 side) in the first direction DR1 of the straight tube portion 22a and the other end in the first direction DR1 of the straight tube portion 22b are supported by the second side wall 12. From another point of view, the first heat transfer pipe 21 is cantilevered by the case 10 (the second side wall 12). The other ends in two first directions DR1 of the plurality of straight pipe portions 22c adjacent in the third direction DR3 are connected by the second bent pipe portion 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 tube portion 22a in the first direction DR1 is connected to the header 25. The header 25 is formed with a water inlet 27 communicating with the inside of the header 25. The other end of the straight tube portion 22b in the first direction DR1 is connected to the header 26. A water outlet 28 communicating with the inside of the header 26 is formed in the header 26.

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 openings 16 than the plurality of second heat transfer tubes 32 in the third direction DR 3. The main tube 31 and the second heat transfer tube 32 are made of, for example, stainless steel.

The plurality of main tubes 31 are arranged to overlap in the third direction DR 3. The main tube 31 extends along the inner wall surface of the third sidewall 13, the inner wall surface of the first sidewall 11, and the inner wall surface of the fourth sidewall 14. The main tube 31 is 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 main tube 31 and the other end of the main tube 31 are supported by the second sidewall 12. 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. One end of the main tube 31 located closest to the opening 16 in the third direction DR3 is connected to the water outlet 28 via a connection tube 33. The other end of one main tube 31 is connected to one end of another main tube 31 adjacent to the main tube 31 in the third direction DR3 via a connection tube 34.

The second heat transfer tube 32 extends in a first direction DR 1. One end (end on the first side wall 11 side) and the other end (end on the second side wall 12 side) of the second heat transfer pipe 32 in the first direction DR1 are attached to the first side wall 11 and the second side wall 12, respectively. The mounting is performed by brazing.

The plurality of second heat transfer pipes 32 are arranged in a plurality of rows along the second direction DR 2. The plurality of second heat transfer pipes 32 include, for example, a plurality of second heat transfer pipes 32a arranged in a row along the second direction DR2, and a plurality of second heat transfer pipes 32b (not shown) arranged in a row along the second direction DR 2. The second heat transfer pipe 32a is located closer to the opening portions 16 than the second heat transfer pipe 32b in the third direction DR 3.

Among the plurality of second heat transfer pipes 32a, the portion located closest to the fourth side wall 14 side is defined as a second heat transfer pipe 32 aa. Among the plurality of second heat transfer pipes 32a, the portion located closest to the third side wall 13 side is defined as a second heat transfer pipe 32 ab. The portions of the plurality of second heat transfer tubes 32b that are located on the side closest to the fourth side wall 14 are referred to as second heat transfer tubes 32 ba. A portion of the plurality of second heat transfer tubes 32b on the side closest to the third side wall 13 is set as a second heat transfer tube 32 bb.

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

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

A plurality of fins 32c are attached to the second heat transfer pipe 32. The mounting of the fins 32c is performed by brazing. The heat sink 32c is formed of, for example, stainless steel. One of the main surfaces of the heat radiating fin 32c faces the first sidewall 11, and the other main surface of the heat radiating fin 32c faces the second sidewall 12. The plurality of fins 32c are arranged at intervals in the first direction DR 1. In the figure, only a part of the fins 32c is shown, 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 mounting of the support plate 50 to the first side wall 11 is performed, for example, by 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 has two-fold rotational symmetry about the center of the support portion 51 as viewed along the first direction DR 1. From other points of view, the support plate 50 can be used in the same way even if it is rotated by 180 ° about the center.

The support portion 51 faces the first side wall 11 in the first direction DR1 with a space therebetween. The support portion 51 has a plate shape. The support portion 51 supports one end side of the straight tube portion 22 in the first direction DR 1. The support is along a third direction DR 3. The support portion 51 has a plurality of openings 51 a. The opening 51a penetrates the support 51 in the thickness direction. One end side of the straight tube portion 22 in the first direction DR1 is supported by the edge of the opening portion 51 a. The edge of the opening 51a is corrugated in accordance with the arrangement of the straight tube portion 22.

The brazing receiving portion 52 is formed by bending the end portion of the support plate 50 on the second heat exchanging portion 30 side toward the first side wall 11 side. The support plate 50 is mounted to the first side wall 11 at the brazing receiving portion 52. The brazing receiving portion 52 is located between the first heat exchanging portion 20 and the second heat exchanging portion 30 in the third direction DR 3. The brazing receiving portion 52 is located at a position overlapping the first bent pipe portion 23 in the first direction DR 1. The braze receiving portion 52 may also overlap with one of the end sides of the straight tube portion 22 in the first direction DR1 in the first direction DR 1.

The braze receiving portion 52 extends along a second direction DR 2. 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, 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 so as to be distant from the second heat exchanging portion 30 as going from the fourth side wall 14 side toward the third side wall 13 side. The braze receiving portion 52 may also be inclined so as to be distant from the second heat exchange portion 30 as going from the third side wall 13 side toward the fourth side wall 14 side.

The solder receiving portion 52 may have a through hole 52 a. The through hole 52a penetrates the brazing receiving portion 52 in the thickness direction. The through hole 52a is formed 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, for example. However, the through hole 52a does not overlap the portion of the first bent portion 23 where the distance from the first side wall 11 is the smallest. The through-holes 52a extend along the second direction DR 2. A standing wall 52b may be formed at the periphery of the through hole 52 a. The standing wall 52b stands up toward the second heat exchange portion 30 side along the third direction DR 3.

(configuration of Water heating apparatus according to embodiment)

The configuration of the water heater (referred to as "water heater 200") according to the embodiment will be described below.

Fig. 8 is a schematic view of the water warming apparatus 200. As shown in fig. 8, the water warming device 200 includes a heat exchanger 100. The water warming device 200 further includes: a gas valve (gas valve)110, an orifice (orifice)111, a Venturi (Venturi)112, a blower 113, a chamber 114, a burner 115, a spark plug 116, a duct 120, a pipe 130, a pipe 140, a bypass pipe 150, and a three-way valve 160.

By setting the gas valve 110 to an open state, the fuel gas is supplied to the venturi tube 112 through the orifice 111. The fuel gas supplied to the venturi tube 112 is mixed with air in the venturi tube 112 (hereinafter, the fuel gas mixed with air is referred to as a mixed gas). The mixed gas is supplied from the blower 113 to the burner 115 through the chamber 114.

The mixture gas supplied to the combustor 115 is ignited and burned by causing the spark plug 116 to generate a spark. Thereby, combustion gas is generated in the combustor 115. The burner 115 is mounted 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 from the opening 16 side toward the opening 17 side inside the casing 10.

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

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

The water supplied from one end of the pipe 130 flows through the pipe 130 and is supplied to the first heat exchange unit 20 (first heat transfer pipe 21). The water supplied to the first heat exchange portion 20 is heated by heat exchange with the combustion gas. The water flowing through the first heat exchange unit 20 flows through the connection pipe 33 and is supplied to the second heat exchange unit 30 (the main tube 31 and the second heat transfer tube 32).

The water supplied to the second heat exchange portion 30 is heated by heat exchange with the combustion gas. The water flowing through the second heat exchange unit 30 flows through the pipe 140 and is supplied with hot water from the hot water supply plug. The temperature of the water (hot water) supplied from the hot water supply plug is adjusted by mixing the water flowing through the second heat exchange unit 30 and the tap water supplied from the bypass pipe 150 in the pipe 140. The combustion gas that exchanges heat with the water flowing through the first heat exchange unit 20 and the second heat exchange unit 30 is discharged to the outside through the duct 120.

(Effect of the Heat exchanger of the embodiment)

The effect of the heat exchanger 100 will be described below.

In the heat exchanger 100, since the plurality of heat exchange portions (the first heat exchange portion 20 and the second heat exchange portion 30) are housed in the case 10, brazing is performed to the heat exchanger 100 at once. At the time of brazing, the heat exchanger 100 is disposed in the furnace so that the third direction DR3 coincides with the vertical direction.

When the brazing receiving portion 52 is not provided, the brazing material for attaching the second heat transfer pipe 32 to the first side wall 11 may hang down during the brazing, and the first bent portion 23 and the inner wall surface of the first side wall 11 may be joined by the hanging brazing material. If the first bent pipe portion 23 is joined to the inner wall surface of the first side wall 11 by the hanging brazing filler metal, a portion of the first bent pipe portion 23 joined to the inner wall surface of the first side wall 11 by the brazing filler metal may be damaged due to a water hammer phenomenon (water hammer) when water flows through the first bent pipe portion 23.

However, in the heat exchanger 100, the brazing receiving portion 52 is provided. Therefore, the brazing filler metal hanging down from the second heat transfer pipe 32 is received by the braze receiving portion 52. As a result, according to the heat exchanger 100, the brazing material hanging down from the heat exchange portion (the second heat exchange portion 30) positioned above is prevented from joining the first bent pipe portion 23 and the inner wall surface of the first side wall 11, and the first bent pipe portion 23 is prevented from being damaged when water flows.

In addition, the first heat transfer pipe 21 is cantilevered by the second sidewall 12. Therefore, the first heat transfer pipe 21 softens as the temperature rises during brazing, and the one end side of the straight pipe portion 22 that is not supported by the first side wall 11 in the first direction DR1 flexes downward.

In the heat exchanger 100, since one end side of the straight tube portion 22 in the first direction DR1 is supported by the support portion 51 along the third direction DR3, even if the first heat transfer tubes 21 soften during brazing, the one end side of the straight tube portion 22 in the first direction DR1 is less likely to flex downward.

When the brazing receiving portion 52 is formed with the through hole 52a, the combustion gas generated by the burner 115 can pass through the through hole 52 a. Therefore, in this case, a decrease in heat exchange efficiency associated with the provision of the braze receiving portion 52 can be suppressed. When the standing wall 52b is formed in the solder receiving portion 52, the brazing filler metal received by the solder receiving portion 52 can be suppressed from passing through the through hole 52a and falling onto the first bent pipe portion 23, thereby joining the first bent pipe portion 23 to the inner wall surface of the first side wall 11.

When the solder receiving portion 52 is inclined so as to be distant from the second heat exchange portion 30 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 solder received by the solder receiving portion 52 moves along with the inclination, and drops onto the bottom wall 15 in the vicinity of the third side wall 13 (fourth side wall 14) where the first heat transfer pipe 21 is not arranged. In this way, when the solder receiving portion 52 is inclined so as to be distant from the second heat exchange portion 30 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 hanging solder can be handled without adverse effect.

As described above, the embodiments of the present invention have been described, but the embodiments can be variously modified. The scope of the present invention is not limited to the above-described embodiments. The scope of the present invention is indicated by the appended claims, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

[ industrial applicability ]

The present embodiment is particularly advantageously applied to a heat exchanger including a plurality of heat exchange portions in a case and a warm water apparatus including the heat exchanger.

Claims

1. A heat exchanger, comprising:

a housing including a first sidewall and a second sidewall facing each other with a space therebetween in a first direction, and a third sidewall and a fourth sidewall facing each other with a space therebetween in a second direction orthogonal to the first direction;

a first heat exchange unit and a second heat exchange unit housed in the case and arranged to overlap in a third direction orthogonal to the first direction and the second direction; and

the brazing receiving part is arranged on the outer side of the base,

the first heat exchange portion includes a plurality of first heat transfer pipes arranged to overlap in the second direction,

the plurality of first heat transfer pipes respectively comprise a plurality of straight pipe parts, a plurality of first bent pipe parts and a plurality of second bent pipe parts,

the plurality of straight tube portions are arranged in a row along the third direction,

the plurality of straight tube portions extend in the first direction respectively,

the plurality of first bent pipe portions respectively connect one ends in the first direction of two of the plurality of straight pipe portions adjacent in the third direction,

the plurality of second bent pipe portions are respectively located outside both ends in the third direction and connect the other ends in the first direction of two of the plurality of straight pipe portions adjacent in the third direction,

the other end in the first direction of each of the plurality of straight tube portions located at both ends in the third direction is supported by the second side wall,

the second heat exchange portion includes a plurality of second heat transfer pipes extending in the first direction,

both ends of each of the plurality of second heat transfer tubes in the first direction are brazed to the first sidewall and the second sidewall,

the brazing receiving portion is located between the first heat exchanging portion and the second heat exchanging portion in the third direction, and extends along the second direction in such a manner as to overlap with the plurality of first bent pipe portions in the first direction.

2. The heat exchanger of claim 1, further comprising a support plate,

the support plate is mounted to the first side wall and supports one end side in the first direction of the plurality of first heat transfer pipes along the third direction,

the brazing receiving part is integrally provided at an end of the support plate on the second heat exchanging part side in the third direction.

3. The heat exchanger according to claim 1 or 2, wherein a through hole penetrating the brazing receiving portion in the third direction is formed in the brazing receiving portion.

4. The heat exchanger according to claim 3, wherein a standing wall extending toward the second heat exchange portion side along the third direction is formed at a peripheral edge of the through hole.

5. The heat exchanger according to claim 1 or 2, wherein the brazing receiving portion is inclined away from the second heat exchanging portion as going from one of the third and fourth side walls toward the other of the third and fourth side walls.

6. The heat exchanger of claim 3, wherein the braze-receiving portion is inclined away from the second heat exchanging portion as one moves from one of the third and fourth sidewalls toward the other of the third and fourth sidewalls.

7. The heat exchanger of claim 4, wherein the braze-receiving portion is inclined away from the second heat exchanging portion as one moves from one of the third and fourth sidewalls toward the other of the third and fourth sidewalls.

8. A water warming device comprising:

the heat exchanger of any one of claims 1 to 5; and

and a combustion device for supplying combustion gas to the heat exchanger.