Heat exchanger and hot water device

Abstract

To provide a heat exchanger capable of suppressing movement of a baffle plate in a heat transfer pipe.SOLUTION: A heat exchanger (30) includes a first heat transfer pipe (33), a second heat transfer pipe (33), a header (34), and a baffle plate (50). The first heat transfer pipe and the second heat transfer pipe extend along a first direction (DR1) respectively. The first heat transfer pipe and the second heat transfer pipe are arranged side by side along a second direction (DR2) perpendicular to the first direction. The first heat transfer pipe and the second heat transfer pipe include a first end part (33a) and a second end part (33a) respectively in the first direction. The header includes a first member (34a) and a second member (34b). The second member is attached to the first member and defines an internal space of the header. The first member is formed with a first insertion hole (34aa) and a second insertion hole (34ab) communicated with the internal space of the header. The first end part and the second end part are inserted into the first insertion hole and the second insertion hole respectively.SELECTED DRAWING: Figure 6

Description

Technical Field

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

Background Art

[0002] For example, Japanese Patent No. 3687294 (Patent Document 1) describes a heat exchanger. The heat exchanger described in Patent Document 1 has a plurality of heat transfer tubes. A baffle plate is inserted into each of the plurality of heat transfer tubes.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the heat exchanger described in Patent Document 1, the baffle plate may move along the extending direction of the heat transfer tube due to the water pressure of the water flowing through the heat transfer tube. Further, in the heat exchanger described in Patent Document 1, the baffle plate may rotate around a rotation axis along the extending direction of the heat transfer tube. The movement of the baffle plate inside the heat transfer tube may cause generation of abnormal noise.

[0005] The present invention has been made in view of the above problems. More specifically, the present invention provides a heat exchanger capable of suppressing the movement of the baffle plate inside the heat transfer tube.

Means for Solving the Problems

[0006] The heat exchanger of the present invention includes a first heat transfer tube, a second heat transfer tube, a header, and a baffle plate. Each of the first heat transfer tube and the second heat transfer tube extends along a first direction. The first heat transfer tube and the second heat transfer tube are arranged side by side along a second direction perpendicular to the first direction. The first heat transfer tube and the second heat transfer tube each have a first end portion and a second end portion in the first direction. The header has a first member and a second member. The second member is attached to the first member to define an internal space of the header. The first member is formed with a first insertion hole and a second insertion hole that communicate with the internal space of the header. The first end portion and the second end portion are respectively inserted into the first insertion hole and the second insertion hole. The baffle plate has a first plate portion, a second plate portion, and a connecting portion. Each of the first plate portion and the second plate portion extends along the first direction. The first plate portion is inserted into the first heat transfer tube from the first end portion. The second plate portion is inserted into the second heat transfer tube from the second end portion. The connecting portion extends along the second direction in the internal space of the header to connect the first plate portion and the second plate portion. In the internal space of the header, when the smaller of the distance between the first end portion and the second member in the first direction and the distance between the second end portion and the second member in the first direction is defined as a first distance, and the distance between the first member and the second member in the first direction is defined as a second distance, the smaller of the first distance and the second distance is substantially equal to the width of the connecting portion in the first direction.

Effect of the Invention

[0007] According to the heat exchanger of the present invention, it is possible to suppress the movement of the baffle plate in the heat transfer tube.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0009] The hot water device according to the embodiment of the present invention will be described with reference to the drawings. The hot water device according to the embodiment is taken as the hot water device 100. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and duplicate explanations will not be repeated.

[0010] (Schematic Configuration of the Hot Water Device 100) The schematic configuration of the hot water device 100 will be described below.

[0011] FIG. 1 is a schematic diagram of the hot water device 100. As shown in FIG. 1, the hot water device 100 includes a gas valve 10, an orifice 11, a venturi 12, a blower 13, a chamber 14, a burner 15, a spark plug 16, a heat exchanger 20, a duct 60, pipes 70, 71, 72, and a bypass pipe 80. The heat exchanger 20 includes a first heat exchanger 30 and a second heat exchanger 40.

[0012] By setting the gas valve 10 to the open state, fuel gas is supplied to the venturi 12 through the orifice 11. The fuel gas supplied to the venturi 12 is mixed with air in the venturi 12 (hereinafter, the fuel gas mixed with air is referred to as the mixed gas). The mixed gas is supplied to the burner 15 through the chamber 14 by the blower 13. The mixed gas supplied to the burner 15 is ignited and burned by sparking the ignition plug 16. Thereby, combustion gas is generated in the burner 15.

[0013] The first heat exchange part 30 has a pipe 30a. One end and the other end of the pipe 30a are respectively the water inlet 30b and the water outlet 30c of the first heat exchange part 30. The second heat exchange part 40 has a pipe 40a. One end and the other end of the pipe 40a are respectively the water inlet 40b and the water outlet 40c of the second heat exchange part 40.

[0014] The pipe 70 is connected to the water supply at one end. The pipe 70 is connected to the water inlet 40b at the other end. The pipe 71 is connected to the water outlet 40c at one end. The pipe 71 is connected to the water inlet 30b at the other end. The pipe 72 is connected to the water outlet 30c at one end. The pipe 72 is connected to a hot water tap (not shown) at the other end. The bypass pipe 80 is connected to the pipe 70 at one end and is connected to the pipe 72 at the other end. The connection between the bypass pipe 80 and the pipe 72 is made by a three-way valve 81. The duct 60 is connected to the second heat exchange part 40.

[0015] The water passing through the pipe 40a is heated up by performing heat exchange with the combustion gas. The water that has passed through the pipe 40a passes through the pipe 71 and is supplied to the pipe 30a. The water passing through the pipe 30a is further heated up by performing heat exchange with the combustion gas. The water that has passed through the pipe 30a flows out from the hot water faucet through the pipe 72. The water passing through the pipe 72 is temperature-adjusted by being mixed with the water supplied from the bypass pipe 80. Note that the combustion gas is discharged to the outside of the hot water device 100 through the duct 60 after passing through the first heat exchange part 30 and the second heat exchange part 40.

[0016] (Detailed Configuration of the First Heat Exchange Part 30) The detailed configuration of the first heat exchange part 30 will be described below.

[0017] FIG. 2 is a first perspective view of the heat exchanger 20. FIG. 3 is a second perspective view of the heat exchanger 20 viewed from a different angle from FIG. 2. FIG. 4 is a plan view of the heat exchanger 20. As shown in FIGS. 2 to 4, the heat exchanger 20 has a housing 21. The housing 21 has a side wall 21a, a side wall 21b, a side wall 21c, and a side wall 21d.

[0018] The side wall 21a and the side wall 21b face each other with a space therebetween in the first direction DR1, and the side wall 21c and the side wall 21d face each other with a space therebetween in the second direction DR2. The second direction DR2 is a direction perpendicular to the first direction DR1. In this example, the second direction DR2 coincides with the direction in which the side wall 21c and the side wall 21d face each other, but the second direction DR2 does not have to coincide with the direction in which the side wall 21c and the side wall 21d face each other. For example, the direction in which two heat transfer pipes 33 connected to the header 37 described later are arranged may be set as the second direction DR2. The direction perpendicular to the first direction DR1 and the second direction DR2 is defined as the third direction DR3. The housing 21 has an opening 21e at one end (upper end) in the third direction DR3. The opening 21e is defined by the side wall 21a, the side wall 21b, the side wall 21c, and the side wall 21d. The combustion gas generated in the burner 15 is supplied into the housing 21 from the opening 21e.

[0019] The first heat exchange section 30 includes a plurality of barrel pipes 31, a plurality of headers 32, a plurality of heat transfer pipes 33, a plurality of headers 34, a header 35, a plurality of headers 36, a header 37, a header 38, and a plurality of fins 39.

[0020] The barrel pipes 31 extend in a plane perpendicular to the third direction DR3 along the inner wall surface of the housing 21 (the inner wall surfaces of the side walls 21c, 21b, and 21d). The plurality of barrel pipes 31 are arranged in a stacked manner with intervals along the third direction DR3. One end and the other end of the barrel pipe 31 are inserted into insertion holes (not shown) formed in the side wall 21a and are supported by the side wall 21a.

[0021] One end of the barrel pipe 31 closest to the opening 21e in the third direction DR3 forms the water inlet 30b. One end of one barrel pipe 31 and one end of another barrel pipe 31 adjacent below the one barrel pipe 31 are connected to each other by a header 32.

[0022] The heat transfer pipes 33 extend along the first direction DR1. The heat transfer pipes 33 have an end 33a and an end 33b in the first direction DR1 (see FIG. 5). The end 33a and the end 33b are inserted into insertion holes (not shown) formed in the side wall 21a and insertion holes (not shown) formed in the side wall 21b, respectively. Thereby, the heat transfer pipes 33 are supported by the side wall 21a and the side wall 21b.

[0023] The plurality of heat transfer pipes 33 are arranged in a plurality of rows along the second direction DR2. In the example of the present embodiment, the plurality of heat transfer pipes 33 are arranged in two rows along the second direction DR2. The row of heat transfer pipes 33 closest to the opening 21e in the third direction DR3 may be referred to as the first row, and the row of heat transfer pipes 33 adjacent to the first row may be referred to as the second row.

[0024] The ends 33a of two adjacent heat transfer tubes 33 are connected to each other by a header 34. The end 33a of the heat transfer tube 33 that belongs to the first row and is closest to the side wall 21d is connected by a header 35 to the other end of the body pipe 31 that is farthest from the opening 21e in the third direction DR3.

[0025] The ends 33b of two adjacent heat transfer tubes are connected to each other by a header 36. The end 33b of the heat transfer tube 33 that belongs to the first row and is closest to the side wall 21c is connected by a header 37 to the end 33b of the heat transfer tube 33 that belongs to the second row and is closest to the side wall 21c. The end 33b of the heat transfer tube 33 that belongs to the second row and is closest to the side wall 21d is connected to a header 38. The header 38 has a water outlet 30c. In the above manner, the plurality of body pipes 31, the plurality of headers 32, the plurality of heat transfer tubes 33, the plurality of headers 34, the header 35, the plurality of headers 36, the header 37, and the header 38 constitute the piping 30a.

[0026] The plurality of fins 39 are arranged in layers along the first direction DR1. A plurality of heat transfer tubes 33 are passed through insertion holes (not shown) formed in the fins 39. Note that in FIGS. 2 to 4, only a part of the plurality of fins 39 is shown.

[0027] FIG. 5 is an exploded perspective view of the first heat exchange section 30. In FIG. 5, only two adjacent heat transfer tubes 33, one header 34, and a baffle plate 50 in the second direction DR2 are shown. FIG. 6 is a first partial cross-sectional view of the first heat exchange section 30. FIG. 6 shows a cross-section perpendicular to the third direction DR3. FIG. 7 is a second partial cross-sectional view of the first heat exchange section 30. FIG. 7 shows a cross-section perpendicular to the first direction DR1. FIG. 8 is a plan view of the baffle plate 50. As shown in FIGS. 5 to 8, the first heat exchange section 30 has a baffle plate 50.

[0028] The header 34 has a first member 34a and a second member 34b. The second member 34b defines an internal space of the header 34 by being attached to the first member 34a. The second member 34b is attached to the first member 34a, for example, by brazing.

[0029] An insertion hole 34aa and an insertion hole 34ab are formed in the first member 34a. The insertion hole 34aa and the insertion hole 34ab penetrate the first member 34a along a first direction DR1 so as to communicate with the internal space of the header 34. The insertion hole 34aa and the insertion hole 34ab are arranged along a second direction DR2. End portions 33a of two adjacent heat transfer tubes 33 are respectively inserted into the insertion hole 34aa and the insertion hole 34ab.

[0030] The baffle plate 50 has two plate-like portions 51 and a connecting portion 52. The plate-like portions 51 extend along the first direction DR1. The two plate-like portions 51 are respectively inserted into two adjacent heat transfer tubes 33 in the second direction DR2 from the side of the end portion 33a. The connecting portion 52 is disposed in the internal space of the header 34. The connecting portion 52 extends along the second direction DR2 in the internal space of the header 34 and connects the two plate-like portions 51. In other words, when viewed along a third direction DR3, the baffle plate 50 is U-shaped.

[0031] The plate-like portion 51 has an end 51a and an end 51b in the first direction DR1. The plate-like portion 51 is connected to the connecting portion 52 at the end 51a. The end 51b is an end opposite to the end 51a. The plate-like portion 51 has an end 51c and an end 51d in the second direction DR2. The end 51d is an end opposite to the end 51c. The plate-like portion 51 rises along the third direction DR3 at the end 51c and the end 51d.

[0032] When the plate-like portion 51 is inserted into the heat transfer tube 33, the turbulence of the water flowing through the heat transfer tube 33 is promoted. More specifically, a plurality of through-holes 51e are formed in the plate-like portion 51. The through-holes 51e penetrate the plate-like portion 51 along the third direction DR3. The plurality of through-holes 51e are arranged at intervals along the first direction DR1. Further, the plate-like portion 51 has a plurality of protruding portions 51f. The protruding portions 51f extend along the first direction DR1 from the opening edge of the through-hole 51e while being inclined with respect to the third direction DR3.

[0033] The water flowing through the heat transfer tube 33 passes through the through-hole 51e and travels back and forth between the internal space of the heat transfer tube 33 on one side of the plate-like portion 51 and the internal space of the heat transfer tube 33 on the other side of the plate-like portion 51 in the third direction DR3, thereby promoting turbulence. The protruding portions 51f promote the back-and-forth movement of the water between the internal space of the heat transfer tube 33 on one side of the plate-like portion 51 and the internal space of the heat transfer tube 33 on the other side of the plate-like portion 51 in the third direction DR3 by coming into contact with the water flowing through the heat transfer tube 33.

[0034] The connecting portion 52 has an end 52a and an end 52b in the first direction DR1. The connecting portion 52 is connected to two plate-like portions 51 at the end 52a. The end 52b is the end on the opposite side of the end 52a. The connecting portion 52 rises along the third direction DR3 at the end 52a and the end 52b. A through-hole 52c may be formed in the connecting portion 52. The through-hole 52c penetrates the connecting portion 52 along the third direction DR3.

[0035] In the internal space of the header 34, the distance between the end 33a in the first direction DR1 and the second member 34b is defined as the distance DIS1. Note that, among the distances between one end 33a of two adjacent heat transfer tubes 33 in the first direction DR1 and the second member 34b and between the other end 33a of two adjacent heat transfer tubes 33 in the first direction DR1 and the second member 34b, the smaller one is defined as the distance DIS1. In the internal space of the header 34, the distance between the first member 34a and the second member 34b in the first direction DR1 is defined as the distance DIS2. The distance DIS2 is measured between the portion of the first member 34a between the insertion holes 34aa and 34ab and the second member 34b. The width of the connecting portion 52 in the first direction DR1 is defined as the width W. The width W is measured in the portion between the two plate-like portions 51 in the second direction DR2.

[0036] The smaller one of the distance DIS1 and the distance DIS2 is substantially equal to the width W. "The smaller one of the distance DIS1 and the distance DIS2 is substantially equal to the width W" means the case where the difference between the smaller one of the distance DIS1 and the distance DIS2 and the width W is 0.3 times or less of the width W. Also, the difference between the smaller one of the distance DIS1 and the distance DIS2 and the width W may be 0.2 times or less of the width W. The difference between the smaller one of the distance DIS1 and the distance DIS2 and the width W may be 0 times of the width W. That is, the smaller one of the distance DIS1 and the distance DIS2 and the width W may be equal. The difference between the smaller one of the distance DIS1 and the distance DIS2 and the width W may be 0.1 times or more and 0.3 times or less of the width W. Note that, in the example shown in FIG. 6, the distance DIS1 is smaller than the distance DIS2.

[0037] (Modification Example 1 of the First Heat Exchange Unit 30) FIG. 9 is a cross-sectional view of the first heat exchange portion 30 according to Modification 1. In FIG. 9, a cross-section at a position corresponding to FIG. 6 is shown. As shown in FIG. 9, a plurality of through holes 52c may be formed in the connecting portion 52. The plurality of through holes 52c are arranged at intervals along the second direction DR2. In the example shown in FIG. 9, the number of through holes 52c is two, but the number of through holes 52c is not limited to this. The portion of the connecting portion 52 between two adjacent through holes 52c is preferably located between the insertion hole 34aa and the insertion hole 34ab in the second direction DR2.

[0038] (Modification 2 of the first heat exchange portion 30) FIG. 10 is a cross-sectional view of the first heat exchange portion 30 according to Modification 2. In FIG. 10, a cross-section at a position corresponding to FIG. 6 is shown. As shown in FIG. 10, instead of the through hole 52c, a notch 52d may be formed in the connecting portion 52. The notch 52d penetrates the connecting portion 52 along the third direction DR3. The notch 52d extends, for example, from the end 52b toward the end 52a.

[0039] (Modification 1 of the baffle plate 50) FIG. 11 is a plan view of the baffle plate 50 according to Modification 1. As shown in FIG. 11, the plate-like portion 51 has a tip portion 51g at the end 51b. The width of the tip portion 51g in the second direction DR2 may become smaller as it approaches the end 51b.

[0040] (Modification 2 of the baffle plate 50) FIG. 12 is a cross-sectional view of the baffle plate 50 according to Modification 2. As shown in FIG. 12, when a plurality of through holes 52c are formed in the connecting portion 52, a raised portion 52ca may be formed at least at one end in the second direction DR2 of two adjacent through holes 52c. The raised portion 52ca extends along the third direction DR3.

[0041] (Effect of the first heat exchange portion 30) The effect of the first heat exchange portion 30 will be described below.

[0042] The first heat exchange part 30 has a baffle plate 50. Therefore, the turbulence of the water flowing through the heat transfer tube 33 is promoted by the plate-like part 51 inserted into the heat transfer tube 33, and the heat exchange efficiency of the first heat exchange part 30 is improved.

[0043] The baffle plate 50 tends to move along the first direction DR1 due to the water pressure of the water flowing through the heat transfer tube 33. When the baffle plate 50 moves largely along the first direction DR1, abnormal noise may occur along with the movement. In the first heat exchange part 30, the smaller one of the distance DIS1 and the distance DIS2 is substantially equal to the width W. That is, in the first heat exchange part 30, the baffle plate 50 does not move along the first direction DR1 by a distance equal to or more than 0.3 times the width W.

[0044] In addition, if the difference between the smaller one of the distance DIS1 and the distance DIS2 and the width W is too small, soldering for attaching the second member 34b to the first member 34a may be difficult. Therefore, by setting the difference between the smaller one of the distance DIS1 and the distance DIS2 and the width W to be not less than 0.1 times and not more than 0.3 times the width W, it is possible to facilitate the attachment of the second member 34b to the first member 34a and regulate the movement of the baffle plate 50 along the first direction DR1.

[0045] When the baffle plate 50 does not have the connecting part 52, the plate-like part 51 can rotate freely around the rotation axis along the first direction DR1. However, in the first heat exchange part 30, since the baffle plate 50 has the connecting part 52, the angular range in which the baffle plate 50 can rotate around the rotation axis along the first direction DR1 is extremely narrow. From these viewpoints, in the first heat exchange part 30, the translational movement along the first direction DR1 and the rotational movement around the rotation axis along the first direction DR1 are regulated, and the generation of abnormal noise is suppressed.

[0046] In order to promote the turbulent flow of the water flowing through the heat transfer pipe 33, a turbulent flow coil may be inserted into the heat transfer pipe 33 instead of the baffle plate 50. However, when using a turbulent flow coil, the turbulent flow coil is compressed by the water pressure of the water flowing through the heat transfer pipe 33 and the turbulent flow coil enters the internal space of the header 34, resulting in an increase in pressure loss. On the other hand, in the first heat exchange section 30 using the baffle plate 50, the same phenomenon does not occur, and the pressure loss can be suppressed. Further, in the first heat exchange section 30, by forming through holes 52c and notches 52d in the connecting portion 52, the pressure loss can be further suppressed in the same manner.

[0047] When a plurality of through holes 52c are formed in the connecting portion 52, the water flowing through the heat transfer pipe 33 through the through holes 52c travels between the internal space of the header 34 on one side of the connecting portion 52 in the third direction DR3 and the internal space of the header 34 on the other side of the connecting portion 52 in the third direction DR3 through the through holes 52c, thereby promoting the turbulent flow of the water flowing in the internal space of the header 34. In this case, due to the formation of the raised portion 52ca, the flow of water between the internal space of the header 34 on one side of the connecting portion 52 in the third direction DR3 and the internal space of the header 34 on the other side of the connecting portion 52 in the third direction DR3, and thus the turbulent flow of the water is further promoted. Further, although the strength and rigidity of the connecting portion 52 are reduced by the formation of the through holes 52c, when the portion of the connecting portion 52 between two adjacent through holes 52c is between the insertion hole 34aa and the insertion hole 34ab in the second direction DR2, the deformation of the connecting portion 52 due to the water pressure is suppressed by the portion.

[0048] When the plate-like portion 51 rises along the third direction DR3 at the ends 51c and 51d, the contact between the heat transfer pipe 33 and the plate-like portion 51 becomes surface contact, and the generation of abnormal noise is further suppressed. Similarly, when the connecting portion 52 rises along the third direction DR3 at the ends 52a and 52b, the contact between the end portion 33a (the first member 34a) or the second member 34b and the connecting portion 52 becomes surface contact, so that the generation of abnormal noise is similarly further suppressed.

[0049] When the width of the tip portion 51g in the second direction DR2 decreases as it approaches the end 51b, the insertion of the plate-like portion 51 into the heat transfer tube 33 becomes easier. Since the two plate-like portions 51 are connected by the connecting portion 52, the number of insertions of the baffle plate 50 is halved, and from this perspective as well, the assembly of the first heat exchange portion 30 becomes easier.

[0050] (Supplementary Note) The above-described embodiment includes the following configurations.

[0051] <Supplementary Note 1> A first heat transfer tube and a second heat transfer tube, a header, and a baffle plate, each of the first heat transfer tube and the second heat transfer tube extends along a first direction, the first heat transfer tube and the second heat transfer tube are arranged side by side along a second direction perpendicular to the first direction, the first heat transfer tube and the second heat transfer tube each have a first end portion and a second end portion in the first direction, the header has a first member and a second member, the second member is attached to the first member to define an internal space of the header, the first member is formed with a first insertion hole and a second insertion hole communicating with the internal space, the first end portion and the second end portion are respectively inserted into the first insertion hole and the second insertion hole, the baffle plate has a first plate-like portion, a second plate-like portion, and a connecting portion, each of the first plate-like portion and the second plate-like portion extends along the first direction, the first plate-like portion is inserted into the first heat transfer tube from the first end portion, the second plate-like portion is inserted into the second heat transfer tube from the second end portion, the connecting portion extends along the second direction in the internal space to connect the first plate-like portion and the second plate-like portion, In the internal space of the header, when the smaller of the distance between the first end portion and the second member in the first direction and the distance between the second end portion and the second member in the first direction is defined as the first distance, and the distance between the first member and the second member in the first direction is defined as the second distance, the smaller of the first distance and the second distance is substantially equal to the width of the connecting portion in the first direction, heat exchanger.

[0052] <Appendix 2> At least one through hole is formed in the connecting portion, Each of the at least one through hole penetrates the connecting portion along a third direction perpendicular to the first direction and the second direction, the heat exchanger according to Appendix 1.

[0053] <Appendix 3> The at least one through hole is a plurality of through holes, The plurality of through holes are arranged at intervals along the second direction, the heat exchanger according to Appendix 2.

[0054] <Appendix 4> At least one of the portions of the connecting portion between two adjacent ones of the plurality of through holes is located between the first insertion hole and the second insertion hole in the second direction, the heat exchanger according to Appendix 3.

[0055] <Appendix 5> At least one of the portions of the connecting portion between two adjacent ones of the plurality of through holes has a raised portion formed at an end in the second direction and extending along the third direction, the heat exchanger according to Appendix 3 or Appendix 4.

[0056] <Appendix 6> At least one notch is formed in the connecting portion, Each of the at least one notch penetrates the connecting portion along a third direction perpendicular to the first direction and the second direction, the heat exchanger according to Appendix 1.

[0057] <Appendix 7> Each of the first plate-like portion and the second plate-like portion has a first end and a second end which is an end opposite to the first end in the second direction. The heat exchanger according to any one of Appendices 1 to 6, wherein each of the first plate-like portion and the second plate-like portion rises along a third direction perpendicular to the first direction and the second direction at the first end and the second end.

[0058] <Appendix 8> Each of the first plate-like portion and the second plate-like portion has a third end connected to the connecting portion and a fourth end which is an end opposite to the third end in the first direction. Each of the first plate-like portion and the second plate-like portion has a tip at the fourth end. The heat exchanger according to any one of Appendices 1 to 7, wherein the width of the tip in the second direction becomes smaller as it approaches the fourth end.

[0059] <Appendix 9> The connecting portion has a fifth end connected to the first plate-like portion and the second plate-like portion and a sixth end which is an end opposite to the fifth end in the first direction. The heat exchanger according to any one of Appendices 1 to 8, wherein the connecting portion rises along a third direction perpendicular to the first direction and the second direction at the fifth end and the sixth end.

[0060] <Appendix 10> A hot water device comprising the heat exchanger according to any one of Appendices 1 to 9.

[0061] Although the embodiments of the present invention have been described as above, it is possible to variously modify the above embodiments. Also, the scope of the present invention is not limited to the above embodiments. The scope of the present invention is shown by the scope of claims and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

Explanation of reference numerals

[0062] 100 Hot water device, 10 Gas valve, 11 Orifice, 12 Venturi, 13 Blower, 14 Chamber, 15 Burner, 16 Ignition plug, 20 Heat exchanger, 21 Housing, 21a, 21b, 21c, 21d Side walls, 21e Opening, 30 First heat exchange section, 30a Pipe, 30b Water inlet, 30c Water outlet, 31 Barrel pipe, 32 Header, 33 Heat transfer pipe, 33a, 33b Ends, 34a First member, 34aa, 34ab Insertion holes, 34b Second member, 34, 35, 36, 37, 38 Headers, 39 Fins, 40 Second heat exchange section, 40a Pipe, 40b Water inlet, 40c Water outlet, 50 Baffle plate, 51 Plate-like part, 51a, 51b, 51c, 51d Ends, 51e Through hole, 51f Protrusion, 51g Tip, 52 Connecting part, 52a End, 52b End, 52c Through hole, 52ca Uplifted part, 52d Notch, 60 Duct, 70 Pipe, 71 Pipe, 72 Pipe, 80 Bypass pipe, 81 Three-way valve, DIS1 Distance, DIS2 Distance, DR1 First direction, DR2 Second direction, DR3 Third direction, W Width.

Claims

1. a first heat transfer tube and a second heat transfer tube, a header, and a baffle plate, each of the first heat transfer tube and the second heat transfer tube extends along a first direction, the first heat transfer tube and the second heat transfer tube are arranged side by side along a second direction perpendicular to the first direction, the first heat transfer tube and the second heat transfer tube each have a first end portion and a second end portion in the first direction, the header has a first member and a second member, the second member is attached to the first member to define an internal space of the header, a first insertion hole and a second insertion hole communicating with the internal space are formed in the first member, the first end portion and the second end portion are respectively inserted into the first insertion hole and the second insertion hole, the baffle plate has a first plate-like portion, a second plate-like portion, and a connecting portion, each of the first plate-like portion and the second plate-like portion extends along the first direction, the first plate-like portion is inserted into the first heat transfer tube from the first end portion, the second plate-like portion is inserted into the second heat transfer tube from the second end portion, the connecting portion extends along the second direction in the internal space to connect the first plate-like portion and the second plate-like portion, In the internal space of the header, when the smaller of the distance between the first end portion and the second member in the first direction and the distance between the second end portion and the second member in the first direction is defined as a first distance, and the distance between the first member and the second member in the first direction is defined as a second distance, the smaller of the first distance and the second distance is substantially equal to the width of the connecting portion in the first direction, a heat exchanger.

2. at least one through hole is formed in the connecting portion, For each of the at least one through hole, it penetrates the connecting portion along a third direction perpendicular to the first direction and the second direction. The heat exchanger according to claim 1.

3. The at least one through hole is a plurality of through holes, The plurality of through holes are arranged at intervals along the second direction. The heat exchanger according to claim 2.

4. At least one of the portions of the connecting portion between two adjacent ones of the plurality of through holes is located between the first insertion hole and the second insertion hole in the second direction. The heat exchanger according to claim 3.

5. At least one of the portions of the connecting portion between two adjacent ones of the plurality of through holes has a raised portion formed at an end in the second direction and extending along the third direction. The heat exchanger according to claim 4.

6. At least one notch is formed in the connecting portion, For each of the at least one notch, it penetrates the connecting portion along a third direction perpendicular to the first direction and the second direction. The heat exchanger according to claim 1.

7. Each of the first plate-like portion and the second plate-like portion has a first end and a second end which is an end opposite to the first end in the second direction, Each of the first plate-like portion and the second plate-like portion rises along a third direction perpendicular to the first direction and the second direction at the first end and the second end. The heat exchanger according to claim 1.

8. Each of the first plate-like portion and the second plate-like portion has a third end connected to the connecting portion and a fourth end which is an end opposite to the third end in the first direction, Each of the first plate-like portion and the second plate-like portion has a tip at the fourth end, The heat exchanger according to claim 1, wherein the width of the tip portion in the second direction decreases as it approaches the fourth end. **Claim 9** The connecting portion has a fifth end connected to the first plate-like portion and the second plate-like portion in the first direction, and a sixth end which is the end opposite to the fifth end. The heat exchanger according to claim 1, wherein the connecting portion rises along a third direction perpendicular to the first direction and the second direction at the fifth end and the sixth end. **Claim 10** A hot water device comprising the heat exchanger according to any one of claims 1 to 9.

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