CN216432657U

CN216432657U - Heat exchanger

Info

Publication number: CN216432657U
Application number: CN201890001711.2U
Authority: CN
Inventors: 森田久登; 七种哲二; 阿巴斯塔利
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2022-05-03
Anticipated expiration: 2028-12-18
Also published as: WO2020129155A1

Abstract

The present invention relates to a heat exchanger and a refrigeration cycle apparatus. The heat exchanger has a bent portion in which a short diameter portion of a heat transfer pipe having a flat shape with a short diameter portion and a long diameter portion in a cross section is bent inside, and a side plate fixed to the heat transfer pipe, wherein the side plate has a base plate portion and a low rigidity portion along a direction in which the heat transfer pipe extends, and is bent in a region including the low rigidity portion in 1 place, and the low rigidity portion is provided between the base plate portions and formed to have a lower rigidity than the base plate portion.

Description

Heat exchanger

Technical Field

The present invention relates to heat exchangers.

Background

A heat exchanger including a heat transfer pipe having a substantially flat cross section and a side plate has been known (see, for example, patent document 1). The heat transfer tube and the side plate of the heat exchanger of patent document 1 have a linear shape.

Patent document 1: japanese patent laid-open No. 2007-139376

In recent years, a heat exchanger which realizes high efficiency of heat exchange and space saving has been demanded. By forming the heat exchanger having the flat heat transfer tubes into a curved shape, it is possible to achieve high efficiency and space saving of heat exchange. However, it is difficult to bend the heat exchanger having the heat conductive pipes in the flat shape. For example, when a heat exchanger having a flat heat transfer pipe is bent, a large force acts on the heat exchanger, and thus there is a problem that the heat exchanger is abnormally deformed by the bending process.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above-described problems, and an object thereof is to obtain a heat exchanger having a bent portion in which a short diameter portion of a flat heat transfer pipe is bent inward.

The heat exchanger according to the present invention includes a side plate fixed to a heat transfer pipe, the side plate including a substrate portion and a low rigidity portion provided between the substrate portions and formed to have a lower rigidity than the substrate portion, the side plate being capable of being bent in a region including 1 part of the low rigidity portion along a direction in which the heat transfer pipe extends, the side plate having a bent portion inside a case where the short diameter portion of the heat transfer pipe having a flat shape with a short diameter portion and a long diameter portion in a cross section is bent.

Since the heat exchanger of the present invention is bent in the region of the side plate including the low rigidity portion of 1 location, the force acting when the heat exchanger is bent can be reduced.

In addition, the low rigidity portion is provided only inside the curve of the side plate.

In addition, the low rigidity portion has an inner cutout provided inside the curve of the side plate.

In addition, the low rigidity portion has an outer cutout provided on an outer side of the bend of the side plate.

In addition, the low rigidity portion has a hole provided to the side plate.

In addition, the low rigidity portion has a bellows-shaped portion provided to the side plate.

In addition, the interval of the high portions of the corrugated tube shape portion on the inner side of the bend of the side plate is narrower than the interval of the high portions of the corrugated tube shape portion on the outer side of the bend of the side plate.

In addition, the side plate is formed to have a width smaller than the length of the heat transfer pipe.

Further, a header is provided to which both ends of the heat transfer pipe are connected, and a gap is provided between the side plate and the header.

The header includes a thin portion and a thick portion formed to have a thickness greater than that of the thin portion, and the heat transfer pipe is connected to the thick portion.

Further, a reinforcing member is provided for reinforcing the header.

Further, the reinforcing member reinforces at least a part of the heat transfer tubes connected to the header at a position closest to the end of the header up to the end of the header in a direction in which the header extends.

In addition, the reinforcing member reinforces a region including the heat conductive pipes connected to the header at a position closest to an end of the header, in a direction in which the header extends.

Further, the heat exchanger includes a fin provided between the heat pipe and the side plate and fixed to the heat pipe and the side plate.

Drawings

Fig. 1 is a view schematically showing an external appearance of an outdoor unit of a refrigeration cycle apparatus according to embodiment 1 of the present invention when viewed from the front.

3 fig. 3 2 3 is 3 a 3 view 3 schematically 3 showing 3 a 3 cross 3 section 3 a 3- 3 a 3 in 3 fig. 3 1 3. 3

Fig. 3 is a view schematically showing a state before bending of the heat exchanger shown in fig. 2.

Fig. 4 is a view schematically showing a cross section of the heat transfer pipe shown in fig. 3.

Fig. 5 shows modification 1 of fig. 4.

Fig. 6 is a view schematically showing an external appearance of the heat exchanger shown in fig. 3 when viewed from above.

Fig. 7 shows modification 2 of fig. 6.

Fig. 8 shows modification 3 of fig. 6.

Fig. 9 shows modification 4 of fig. 6.

Fig. 10 shows a modification 5 of fig. 6.

Fig. 11 shows modification 6 of fig. 6.

Fig. 12 shows modification 7 of fig. 6.

Fig. 13 is a view schematically showing a section B-B of fig. 12.

Fig. 14 shows a modification 8 of fig. 6.

Fig. 15 shows modification 9 of fig. 1.

Fig. 16 is a view schematically showing a cross section C-C of fig. 15.

Fig. 17 is a diagram schematically showing a state before bending of the heat exchanger according to embodiment 2 of the present invention.

Fig. 18 is a view schematically showing a D-D section of fig. 17.

Fig. 19 shows a modification 10 of fig. 17.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and the description thereof will be omitted or simplified as appropriate. In addition, the shape, size, arrangement, and the like of the structures described in the drawings can be appropriately changed within the scope of the present invention.

Embodiment 1.

[ refrigeration cycle device ]

Fig. 1 is a view schematically showing an external appearance of an outdoor unit of a refrigeration cycle apparatus according to embodiment 1 of the present invention when viewed from the front. 3 fig. 3 2 3 is 3 a 3 view 3 schematically 3 showing 3 a 3 cross 3 section 3 a 3- 3 a 3 in 3 fig. 3 1 3. 3 As shown in fig. 1 and 2, the outdoor unit 100 of the example of the present embodiment is connected to an indoor unit, not shown, by a refrigerant pipe, to form a refrigeration cycle apparatus. The refrigeration cycle apparatus can be applied to a refrigeration apparatus that cools a cooling space such as a warehouse or an air conditioning apparatus that performs air conditioning in a building or the like. As shown in fig. 1, the outdoor unit 100 is a side-flow type outdoor unit 100 that blows air in a substantially horizontal direction. As shown in fig. 2, a heat exchange chamber 110 and a machine chamber 111 are formed inside the outdoor unit 100. The machine chamber 111 is provided with a compressor and the like, which are not shown. The heat exchanger 10 and the blower 102 are provided in the heat exchange chamber 110. The blower 102 blows air to the heat exchanger 10. The air is blown by the blower 102 to promote heat exchange between the air being blown and the fluid flowing inside the heat exchanger 10. As shown in fig. 1, a fan protector 103 that covers the blower 102 is provided in front of the blower 102.

[ Heat exchanger ]

As shown in fig. 2, the heat exchanger 10 has headers 12 provided at both ends. The fluid heat-exchanged in the heat exchanger 10 flows in from one of the headers 12 and flows out from the other header 12, for example. The heat exchanger 10 has a bent portion 180 in which a bent inner side 181 has a concave shape and a bent outer side 182 has a convex shape. The curved inner side 181 is a portion having a larger curvature, and the curved outer side 182 is a portion having a smaller curvature. The heat exchanger 10 has a single-bent shape having 1 bent portion 180.

Fig. 3 is a view schematically showing a state before bending of the heat exchanger shown in fig. 2. As shown in fig. 3, the heat exchanger 10 includes a header 12, heat transfer tubes 14, fins 16, and side plates 18. The heat exchanger 10 of the example of the present embodiment is an aluminum heat exchanger in which the header 12, the heat transfer tubes 14, the fins 16, and the side plates 18 are formed of aluminum. The heat exchanger 10 of the example of the embodiment is not limited to being formed of aluminum. The heat pipe 14 allows fluid to flow therein. The heat conductive pipes 14 communicate with the interior of the header 12. The heat transfer tubes 14 are welded to the header 12 in a state in which the distal ends of the heat transfer tubes 14 are inserted into the header 12. A plurality of heat transfer pipes 14 are stacked in the stacking direction. The fluid flowing into one of the headers 12 flows in parallel through the plurality of heat transfer tubes 14, and flows out from the other header 12. That is, the heat exchanger 10 of the example of fig. 3 is a parallel flow heat exchanger in which a fluid flows in parallel through a plurality of heat transfer tubes 14. The heat exchanger 10 of the example of the embodiment is not limited to the parallel flow heat exchanger.

Fig. 4 is a schematic cross-sectional view of the heat transfer pipe shown in fig. 3. Fig. 5 shows modification 1 of fig. 4. As shown in fig. 4, the heat transfer pipe 14 has a flat cross section having a short diameter portion 14A and a long diameter portion 14B. The heat transfer pipe 14 has a single flow path 14-1 therein. As shown in fig. 5, the heat transfer pipe 14 may have a structure having a plurality of flow paths 14-2 therein.

The side plate 18 shown in fig. 3 protects the heat transfer pipe 14 and the fins 16. The side plate 18 is a plate-shaped member provided to suppress deformation of the heat transfer pipe 14 and the fins 16. The side plates 18 are provided on both sides of the heat transfer pipes 14 in the stacking direction, for example. The side plate 18 is fixed to the heat transfer pipe 14 via the fin 16. The side plates 18 and the fins 16 are fixed to each other by, for example, welding, and the fins 16 and the heat transfer tubes 14 are fixed to each other by, for example, welding. The side plate 18 may be fixed to the heat transfer pipe 14 by welding or the like without interposing the fins 16 therebetween. Both end portions of the side plate 18 are fixed to the header 12 by welding or the like. The side plates 18 are not inserted into the header 12, unlike the heat transfer tubes 14, at both ends. Both end portions of the side plate 18 may be inserted into the inside of the header 12.

The fins 16 improve the heat exchange efficiency of the heat exchanger 10 by increasing the surface area for heat exchange with air. The fins 16 are corrugated fins having a wave shape with continuous unevenness, for example. The fins 16 are provided between the stacked heat transfer pipes 14 or between the heat transfer pipes 14 and the side plates 18.

Fig. 6 is a view schematically showing an external appearance of the heat exchanger shown in fig. 3 when viewed from above. The side plate 18 includes a base plate portion 18A and a low rigidity portion 18B along the direction in which the side plate 18 extends, that is, the direction in which the heat transfer tubes 14 extend. The low rigidity portion 18B is provided between the substrate portion 18A and the substrate portion 18A. The low rigidity portion 18B is formed to be lower in rigidity than the base plate portion 18A.

As shown in fig. 2, the heat exchanger 10 has a single-pass bent shape. Specifically, the short-diameter portion 14A shown in fig. 4 is bent to become the bent inner side 181 shown in fig. 2. The heat exchanger 10 is bent in a state where the header 12, the heat transfer pipe 14, the fins 16, and the side plate 18 are fixed. Therefore, when the heat exchanger 10 is bent, stress is generated in which the compressive stress generated in the bent inner side 181 and the tensile stress generated in the bent outer side 182 of each of the heat transfer tubes 14, the fins 16, and the side plates 18 are added to each other. Since the side plates 18 are plate-like members having higher rigidity than the heat transfer tubes 14 and the fins 16, a force required for bending is large. Accordingly, as shown in fig. 6, an inner notch 180-a and an outer notch 180-B are provided in the low rigidity portion 18B of the side plate 18, which is the bent portion 180. The inner side cutout 180-a is a cutout shape provided to the curved inner side 181 of the side plate 18. The outer side cutout 180-b is a cutout shape provided to a curved outer side 182 of the side plate 18. By providing the inner cut 180-a, the compressive stress when bending the heat exchanger 10 can be reduced. By providing the outer side cut 180-b, the tensile stress when bending the heat exchanger 10 can be reduced.

As described above, the heat exchanger 10 of the example of the present embodiment includes the bent portion 180 having the inner side 181 in which the short diameter portion 14A of the heat transfer pipe 14 having the flat shape having the short diameter portion 14A and the long diameter portion 14B is bent in cross section. The heat exchanger 10 includes the side plates 18 fixed to the heat transfer tubes 14, and the side plates 18 include substrate portions 18A and low-rigidity portions 18B along the direction in which the heat transfer tubes 14 extend, and the low-rigidity portions 18B are provided between the substrate portions 18A and formed to have lower rigidity than the substrate portions 18A. Further, the heat exchanger 10 is bent in a region including the low rigidity portion 18B of 1 portion. Since the heat exchanger 10 is bent in the region including the low rigidity portion 18B provided in 1 portion of the side plate 18, the stress applied when the heat exchanger 10 is bent can be reduced. By reducing the stress applied when the heat exchanger 10 is bent, a load of an appropriate direction or magnitude can be applied to the heat exchanger 10. By applying an appropriate load to the heat exchanger 10, the shape of the heat exchanger 10 can be highly accurately formed. Further, by applying an appropriate load to the heat exchanger 10, it is possible to reduce the risk of damage to the heat exchanger 10 due to an abnormal force applied when the heat exchanger 10 is bent. Further, since the heat exchanger 10 has the low rigidity portions 18B provided at 1 position of the side plate 18, the position at which the heat exchanger 10 is bent can be set to the low rigidity portions 18B, and the shape of the heat exchanger 10 can be highly accurately formed. Further, by providing the low rigidity portion 18B only in the bent portion 180, the base plate portion 18A of the side plate 18 can reliably protect the heat exchanger tubes 14 and the fins 16.

The present embodiment is not limited to the above-described configuration. For example, the substrate portion 18A and the low rigidity portion 18B may be formed of different materials, and the rigidity of the low rigidity portion 18B may be made lower than that of the substrate portion 18A.

Fig. 7 shows a modification 2 of fig. 6, for example. For example, fig. 8 shows modification 3 of fig. 6. As in modification 2 or modification 3, the low rigidity portion 18B may have an inner notch 180-a or an outer notch 180-B. As shown in fig. 7, by providing the inner side slits 180-a, the compressive stress when bending the heat exchanger 10 can be reduced. As shown in fig. 8, by providing the outer side notches 180-b, the tensile stress when bending the heat exchanger 10 can be reduced. In the case of using either the inner side slit 180-a or the outer side slit 180-b, the inner side slit 180-a may be used for the purpose of reducing the stress to a large extent. This is because the effect of reducing the compressive stress is greater than the effect of reducing the tensile stress with respect to the reduction of the stress when the heat exchanger 10 is bent.

Fig. 9 shows a modification 4 of fig. 6, for example. As shown in fig. 9, the low rigidity portion 18B has a plurality of slits 180-c having slits on the curved inner side 181 of the side plate 18. The slits 180-c are shaped such that the interval becomes larger in the direction of the inner side 181 of the curve when the heat exchanger 10 is bent before the curve. Since the low-rigidity portion 18B is provided by forming the slit 180-c, the area of the side plate 18 to be processed can be reduced, and therefore, the strength of the side plate 18 can be suppressed from being reduced, the processing cost of the side plate 18 can be reduced, and the function of protecting the heat transfer tubes 14 and the fins 16 can be suppressed from being reduced. In fig. 9, the example in which the slit 180-c is provided in the portion of the curved inner side 181 that becomes the inner side cutout 180-a is described, but the inner side cutout 180-a may be omitted and only the slit 180-c may be provided in the portion of the side plate 18 that becomes the curved inner side 181.

Fig. 10 shows a modification 5 of fig. 6, for example. Fig. 11 shows modification 6 of fig. 6. As shown in fig. 10 or 11, the low rigidity portion 18B has holes 180-d, 180-e provided in the side plate 18. The hole forming low rigidity portion 18B is, for example, a long hole shaped hole 180-d having a long diameter along the direction in which side plate 18 extends, as shown in fig. 10, or a long hole shaped hole 180-e having a short diameter along the long side of side plate 18, as shown in fig. 11. The shape of the hole formed in the low rigidity portion 18B is not particularly limited, and may be, for example, an ellipse, a perfect circle, a rectangle, or the like. The hole forming the low rigidity portion 18B may be 1 hole, but a structure having a plurality of holes can appropriately disperse the force and obtain an appropriate strength.

Fig. 12 shows a modification 7 of fig. 6, for example. Fig. 13 is a view schematically showing a section B-B of fig. 12. As shown in fig. 12, the low rigidity portion 18B has a bellows-shaped portion 180-f provided to the side plate 18. By forming the low rigidity portion 18B by the bellows-shaped portion 180-f, the side plate 18 can reliably protect the heat transfer tube 14 and the fin 16. The bellows-shaped portions 180-f may be arranged such that the intervals of the high portions of the curved inner side 181 of the side plate 18 are narrower than the intervals of the high portions of the curved outer side 182 of the side plate 18 when the heat exchanger 10 is bent. The narrow spacing of the high portions of the curved inner sides 181 of the side plates 18 reduces the compressive stress when the heat exchanger 10 is bent. The wide interval of the high portions of the bent outer sides 182 of the side plates 18 reduces the tensile stress when the heat exchanger 10 is bent.

Fig. 14 shows a modification 8 of fig. 6, for example. As shown in fig. 14, the side plate 18 is formed to have a width smaller than the long diameter portion 14B of the heat transfer pipe 14. By narrowing the entire width of the side plate 18, stress applied when the heat exchanger 10 is bent can be reduced.

Fig. 15 shows a modification 9 of fig. 1, for example. Fig. 16 is a view schematically showing a cross section C-C of fig. 15. As shown in fig. 15, the outdoor unit of embodiment 1 may be a top-flow type outdoor unit 100-1 that blows air in a substantially vertical direction. As shown in fig. 16, the heat exchanger according to embodiment 1 may be a heat exchanger 10-1 having a 2-fold curved shape with 2 curved portions 180. Note that the apparatus to which the heat exchanger of embodiment 1 is applied is not limited to the outdoor unit, and may be an indoor unit not shown in the drawings. The shape of the heat exchanger according to embodiment 1 is not limited to the single-bent shape or the 2-bent shape, and may be a shape having 3 or more bends. The fluid for exchanging heat in the heat exchanger 10 is not limited to the refrigerant of the refrigeration cycle, and may be a heat medium such as water or brine.

For example, modifications of embodiment 1 can be combined as appropriate. For example, the structure may be provided with the inner side notches 180-a of modification 2 of fig. 7 and the holes 180-d of modification 5 of fig. 10.

Embodiment 2.

Fig. 17 is a diagram schematically showing a state before bending of the heat exchanger according to embodiment 2 of the present invention. Fig. 18 is a view schematically showing a D-D section of fig. 17. In fig. 17, the same components as those in fig. 3 are denoted by the same reference numerals, and description thereof will be omitted or simplified. As shown in fig. 3, the heat exchanger 10 according to embodiment 1 has side plates 18 fixed to the header 12. As shown in fig. 17, the heat exchanger 10-2 according to embodiment 2 has a gap between the side plate 18-1 and the header 12-1. Embodiment 2 is a structure in which the side plate 18-1 and the header 12-1 are not fixed. In fig. 17, the side plate 18-1 is curved toward the heat exchanger tubes 14, but the curved portions of the side plate 18-1 that face the heat exchanger tubes 14 may be omitted. By configuring the both ends of the side plate 18-1 not to be fixed to the header 12-1, stress at the time of bending the heat exchanger 10-2 can be reduced. Further, by configuring the side plate 18-1 such that both ends are not fixed to the header 12-1, stress acting on the header 12-1 or the heat transfer tubes 14 can be reduced when the heat exchanger 10-2 is bent.

In the example of this embodiment, both ends of the side plate 18-1 are not fixed to the header 12-1, and the header 12-1 is fixed only to the heat transfer tubes 14. Since the header 12-1 is fixed only to the heat transfer tubes 14, the strength of fixing the header 12-1 may be reduced. For example, if the strength of fixing the header is reduced, the header or the heat transfer tube 14 may be deformed. In view of this, in the example of this embodiment, as shown in fig. 18, the header 12-1 has a thin-walled portion 121 and a thick-walled portion 122 formed to be thicker in wall thickness than the thin-walled portion 121. The heat transfer pipe 14 is connected to the thick portion 122. By configuring the heat transfer pipe 14 to be connected to the thick portion 122, the header 12-1 and the heat transfer pipe 14 can be stably fixed. Further, since the rigidity of the header 12-1 becomes high, the deformation of the header 12-1 can be suppressed.

The present embodiment is not limited to the above-described configuration.

Fig. 19 shows a modification 10 of fig. 17. As shown in fig. 19, the heat exchanger 10-3 of modification 10 includes a reinforcing member 13. The reinforcing member 13 is for reinforcing the header 12-1, and is attached to the header 12-1. The reinforcing member 13 is attached to the header 12-1 at a portion where the heat conductive pipes 14 are not attached. The reinforcing member 13 reinforces at least a part from the heat conductive pipe 14 connected to the header 12-1 at the closest of the end of the header 12-1 to the end of the header 12-1 in the direction in which the header 12-1 and the reinforcing member 13 extend. The reinforcing member 13 may extend from the end side of the header 12-1 to a position beyond the heat conductive pipes 14 connected to the header 12-1 at the closest of the ends of the header 12-1 in the direction in which the header 12-1 and the reinforcing member 13 extend. In the region of the header 12-1 where the heat transfer tubes 14 or the side plates 18-1 are not fixed, there is a concern that the strength of fixing of the header 12-1 may decrease. If the strength of fixation of the header 12-1 is reduced, there is a concern that the header 12-1 or the heat transfer tube 14 may be deformed. Accordingly, modification 10 has a structure having the reinforcing member 13 that reinforces at least a part of the heat transfer tube 14 connected to the header 12-1 at the closest position to the end of the header 12-1, up to the end of the header 12-1, along the direction in which the header 12-1 and the reinforcing member 13 extend. By providing the reinforcing member 13, deformation of the header 12-1 or the heat transfer pipe 14 can be suppressed.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. That is, the structure of the above-described embodiment may be appropriately modified, and at least a part thereof may be replaced with another structure. Further, the components whose arrangement is not particularly limited are not limited to the arrangement disclosed in the embodiment, and may be arranged at positions where the functions thereof can be realized.

For example, embodiment 2 can be applied to embodiment 1. For example, the reinforcing member 13 of embodiment 2 can be applied to the header 12 of embodiment 1.

For example, embodiment 1 can be applied to embodiment 2. For example, the low rigidity portion 18B of embodiment 1 can be applied to the side plate 18-1 of embodiment 2.

Description of reference numerals:

10 … heat exchanger; 10-1 … heat exchanger; 10-2 … heat exchanger; 10-3 … heat exchanger; 12 … header; 12-1 … header; 13 … a reinforcing member; 14 … heat conduction pipe; 14-1 … flow path; 14-2 … flow path; 14a … short diameter section; 14B … long diameter section; 16 … a fin; 18 … side panels; 18-1 … side panels; 18a … substrate portion; 18B … low stiffness portion; 100 … outdoor unit; 100-1 … outdoor unit; 102 … blower; 103 … fan guard; 110 … heat exchange chamber; 111 … machine room; 121 … thin wall portion; 122 … thick wall sections; 180 … bend; 180-c … slits; 180-d … pore; 180-e … pore; 180-f … bellows-shaped portion; 181 … inside of the curve; 182 … curved outer sides.

Claims

1. A heat exchanger, characterized in that,

the heat pipe has a bent portion in which the short diameter portion of the heat pipe having a flat shape with a short diameter portion and a long diameter portion in a cross section is bent inward,

and a side plate fixed to the heat transfer pipe,

the side plate has a base plate portion and a low rigidity portion along a direction in which the heat transfer pipe extends, and is bent in a region including the low rigidity portion at 1 position,

the low rigidity portion is provided between the substrate portions and formed to be lower in rigidity than the substrate portions.

2. The heat exchanger of claim 1,

the low rigidity portion is provided only inside a curve of the side plate.

3. The heat exchanger of claim 2,

the low rigidity portion has an inner side cutout provided on an inner side of the bend of the side plate.

4. The heat exchanger of claim 1,

the low rigidity portion has an outer cutout provided on an outer side of the bend of the side plate.

5. The heat exchanger of claim 1,

the low rigidity portion has a hole provided to the side plate.

6. The heat exchanger of claim 1,

the low rigidity portion has a bellows-shaped portion provided to the side plate.

7. The heat exchanger of claim 6,

the interval of the high portions of the corrugated tube shape portion on the inner side of the bend of the side plate is narrower than the interval of the high portions of the corrugated tube shape portion on the outer side of the bend of the side plate.

8. The heat exchanger according to any one of claims 1 to 6,

the side plate is formed to have a width smaller than the length of the heat conductive pipe.

9. The heat exchanger of claim 1,

a header for connecting both ends of the heat transfer pipe,

a gap is provided between the side plates and the header.

10. The heat exchanger of claim 9,

the header is provided with a thin portion and a thick portion formed to have a wall thickness thicker than the thin portion,

the heat pipe is connected to the thick-walled portion.

11. The heat exchanger of claim 9,

the header pipe is provided with a reinforcing member for reinforcing the header pipe.

12. The heat exchanger of claim 11,

the reinforcing member reinforces at least a part from the heat conductive pipe connected to the header at a position closest to the end of the header in a direction in which the header extends.

13. The heat exchanger of claim 12,

the reinforcing member reinforces a region including the heat conductive pipes connected to the header at a position closest to an end of the header, in a direction in which the header extends.

14. The heat exchanger of claim 1,

the heat pipe is provided with a heat conduction pipe and a side plate, and the heat conduction pipe is fixed on the side plate.