heat exchanger

Abstract

Provided is an integrated heat exchanger in which two heat exchange sections are integrally formed, which can reduce thermal stress generated by the temperature difference between the two heat exchange sections and prevent leakage of heat exchange medium between the two heat exchange sections. [Solution] The present invention includes a header having a plurality of grooves formed between a plurality of folded tabs spaced apart from one another along the periphery, and a tank having a lower end inserted into the inside of the header and the folded tabs folded inward to join, thereby joining with the header to form a flow space for the heat exchange medium, and the header has a first groove formed therein that is deeper than the grooves, which easily tolerates thermal deformation caused by temperature differences and reduces thermal stress, thereby preventing leakage of the heat exchange medium.

Description

Technical Field

[0001] The present invention relates to a heat exchanger, and more particularly, to an integrated heat exchanger in which two heat exchange parts are integrally formed, reducing the thermal stress generated by the temperature difference between the two heat exchange parts, and preventing leakage of the heat exchange medium between the two heat exchange parts.

Background Art

[0002] Generally, a heat exchanger is a device that is provided on a specific flow path and performs heat exchange in such a way that the heat exchange medium circulating inside absorbs external heat or releases the heat of the heat exchange medium to the outside. Such heat exchangers are variously manufactured according to the purpose of use and application, such as condensers and evaporators using refrigerant as the heat exchange medium, radiators and heater cores using cooling water as the heat exchange medium, and oil coolers using oil flowing inside engines and transmissions as the heat exchange medium. In recent years, in the automotive industry, due to the increasing global interest in the environment and energy, research for improving fuel efficiency has been carried out, and research and development for weight reduction, miniaturization, and high functionality have been steadily advanced to meet the various needs of consumers.

[0003] However, in a heat exchanger used in an automobile, if a plurality of heat exchangers are separately manufactured and installed, not only does the manufacturing man-hour increase and productivity decrease, but there is also a lot of waste of materials, resulting in an increase in cost, and it is also difficult to secure space for mounting each heat exchanger. Therefore, in order to solve these problems, various technologies for integrating a plurality of heat exchangers have been developed and used. As a related prior art, Patent Document 1 discloses an integrated heat exchanger, and FIG. 1 is a diagram showing a conventional integrated heat exchanger.

[0004] As shown in Figure 1, a conventional integrated heat exchanger includes a first core section 10 consisting of a plurality of first tubes 11 through which a first fluid flows, first heat dissipation fins 12 interposed between the first tubes 11, and first headers 13 connected to both ends of the first tubes 11; a second core section 20 consisting of a plurality of second tubes 21 through which a second fluid flows, second heat dissipation fins 22 interposed between the second tubes 21, and second headers 23 connected to both ends of the second tubes 21; a single tank 30 simultaneously connected to the first headers 12 and second headers 22 of the first and second core sections 10 and 20, which are arranged vertically, forming a space through which the first and second fluids flow; and at least one baffle 60 provided inside the tank 30 to separate the first and second fluids. In this way, the conventional integrated heat exchanger divides the inside of the single tank 30 with baffles 60, allowing the two heat exchange media to be frozen simultaneously.

[0005] However, in this case, the integrated heat exchanger circulates two heat exchange media at different temperatures inside a single tank partitioned by baffles 60. Due to the difference in thermal expansion between the tubes 21 and 22 and the tank 60 caused by the temperature difference, deformation of the tubes, header and tank occurs, which can lead to leakage of the heat exchange media. To solve this, a pair of baffles 60 spaced apart from each other are provided in the tank 30, and a thermal barrier slot 31 is formed between the pair of baffles 60 to reduce heat transfer between the two heat exchange media passing through the tank 30. However, the integrated heat exchanger still suffers from the problem of heat exchange media leakage because heating and cooling are repeated, and it is difficult to adequately absorb stress at the point where the two heat exchange parts are in contact. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Korean Published Patent Publication No. 10-2007-0081635 [Overview of the project] [Problems that the invention aims to solve]

[0007] The present invention was made to solve the above-mentioned problems, and the object of the present invention is to provide a heat exchanger in which two heat exchange sections are integrally formed, that can reduce the thermal stress generated by the temperature difference between the two heat exchange sections and prevent leakage of the heat exchange medium between the two heat exchange sections. [Means for solving the problem]

[0008] To achieve the above objective, the present invention includes a pair of header tanks spaced apart from each other, and a plurality of tubes whose ends are connected to the pair of header tanks, wherein each of the pair of header tanks includes a plurality of bent tabs formed spaced apart from each other along its circumference, and between the plurality of bent tabs, a header has a plurality of grooves formed that are concave from the end, and a tank whose lower end is inserted into the inside of the header, to which the bent tabs are bent inward and joined, and which is joined with the header to form a flow space for a heat exchange medium, wherein each header of the pair of header tanks has a first groove that is deeper than the grooves.

[0009] The system further includes at least one baffle that is coupled to one or more of the headers and tanks to partition the internal space, and the first groove is formed in each header of the pair of header tanks at a position corresponding to the baffle in the longitudinal direction. The baffle separates one side of the header tank from the other, and the temperatures of the heat exchange medium flowing through the separated side and the other side are different. The baffles consist of a pair, spaced apart from each other in the longitudinal direction, and the first groove is located between the pair of baffles in the longitudinal direction.

[0010] The first grooves are formed on both sides of the header in the width direction at positions corresponding to each other. Each header of the pair of header tanks has a second groove formed in the longitudinal direction, spaced apart on one or both sides of the first groove, and the second groove is formed to be deeper than the first groove. The depth of the second groove is formed to be the same as the depth of the first groove. Each header of the pair of header tanks has a third groove formed in the longitudinal direction, spaced apart on one or both sides of the first groove, the third groove being deeper than the first groove, and the first groove being deeper than the third groove.

[0011] The system further includes a dummy tube positioned between the tubes, with both ends connected to the pair of header tanks and connected between the pair of baffles. The interior of the dummy tube is formed in such a way that the heat exchange medium does not flow through it, and the dummy tube is formed in the same shape as the tube. The first groove is located between the adjacent tubes on both sides of the dummy tube. The first groove is formed at a position corresponding to the position of the dummy tube.

[0012] The system further includes a gasket formed in a shape corresponding to the header, the tank, and the pair of baffles, which is interposed between the header and the tank, and between the pair of baffles and the header, to ensure a tight seal. The header has a gasket attachment groove formed at its edge, into which the gasket is inserted. The tank has a joint that protrudes outward at its lower end, which is inserted into the gasket attachment groove of the header, and the gasket is pressed tightly between the gasket attachment groove and the joint.

[0013] The gasket includes a circumferential portion formed in a shape corresponding to the gasket mounting groove of the header, and a pair of bridges, both ends of which are connected to both sides of the circumferential portion in the width direction and which are spaced apart from each other in the longitudinal direction to correspond to the positions of the pair of baffles, wherein the circumferential portion is inserted into the gasket mounting groove, and the pair of bridges are pressed tightly between the pair of baffles and the header.

[0014] The first groove is located between the pair of bridges in the longitudinal direction. If the line extending from the bottom of the recess in the groove is defined as the groove reference line, then the groove reference line is positioned further away from the bottom surface of the header than the contact surface between the tank and the gasket. If the line extending from the bottom of the recess in the first groove is defined as the first groove reference line, then the first groove reference line is located even closer to the bottom surface of the header than the contact surface between the tank and the gasket.

[0015] Each header of the pair of header tanks has a third groove formed longitudinally on one or both sides of the first groove, the third groove being deeper than the first groove, and the first groove being deeper than the third groove. If the line extending from the bottom of the recess of the third groove is taken as the reference line for the third groove, the reference line for the third groove is either further away from the bottom surface of the header than the contact surface between the tank and the gasket, or it is on the same line. [Effects of the Invention]

[0016] According to the present invention, the heat exchanger of the present invention is an integrated heat exchanger in which two heat exchange sections are formed integrally, and has the advantage that by forming it in a way that easily tolerates thermal deformation caused by the temperature difference between the two heat exchange sections and thereby reducing thermal stress, leakage of the heat exchange medium between the two heat exchange sections can be prevented. [Brief explanation of the drawing]

[0017] [Figure 1] This is a diagram showing a conventional integrated heat exchanger. [Figure 2]The assembled perspective view and exploded perspective view showing the heat exchanger according to the first embodiment of the present invention. [Figure 3] The assembled perspective view and exploded perspective view showing the heat exchanger according to the first embodiment of the present invention. [Figure 4] The cross-sectional view showing the first header tank portion of the heat exchanger according to the first embodiment of the present invention. [Figure 5] The perspective view and front view showing a part of the header of the heat exchanger according to the first embodiment of the present invention. [Figure 6] The perspective view and front view showing a part of the header of the heat exchanger according to the first embodiment of the present invention. [Figure 7] The perspective view and front view showing a part of the header of the heat exchanger according to the second embodiment of the present invention. [Figure 8] The perspective view and front view showing a part of the header of the heat exchanger according to the second embodiment of the present invention. [Figure 9] The perspective view and front view showing a part of the header of the heat exchanger according to the third embodiment of the present invention. [Figure 10] The perspective view and front view showing a part of the header of the heat exchanger according to the third embodiment of the present invention.

Mode for Carrying Out the Invention

[0018] Hereinafter, the heat exchanger of the present invention will be described in detail with reference to the drawings. FIG. 2 and FIG. 3 are an assembled perspective view and an exploded perspective view showing the heat exchanger of the present invention, FIG. 4 is a cross-sectional view showing the first header tank portion of the heat exchanger of the present invention, and FIGS. 5 and FIG. 6 are a perspective view and a front view showing a part of the header of the heat exchanger of the present invention.

[0019] As shown in the figure, the heat exchanger of the present invention may be broadly composed of a pair of header tanks 100, 200 and a plurality of tubes 300, and may further include a plurality of fins. The pair of header tanks is composed of a first header tank 100 and a second header tank 200, and the first header tank 100 and the second header tank 200 are each composed of a header, a tank and a baffle, and the header may each have a plurality of grooves and a first groove formed therein, and the pair of header tanks 100, 200 may further include gaskets 120, 220, respectively.

[0020] The first header tank 100 and the second header tank 200 may be arranged side by side, separated by a certain distance vertically from each other, and the headers of the first header tank 100 and the second header tank 200 may have both ends of a plurality of tubes 300 inserted and connected. The first header tank 100 and the second header tank 200 form the space through which the heat exchange medium is stored and flows, and the plurality of tubes 300 form the flow path for the heat exchange medium. Furthermore, each header tank 100 and 200 is formed by the connection of headers 130 and 230 to tanks 110 and 210, and gaskets 120 and 220 may be interposed at the parts where the header and tank are connected to each other to prevent leakage of the heat exchange medium. In addition, the pair of header tanks may have an inlet pipe through which the heat exchange medium flows in and an outlet pipe through which it is discharged.

[0021] Multiple tubes 300 may each have one end connected to the header 130 of the first header tank 100 and the other end connected to the header 230 of the second header tank 200. Alternatively, the multiple tubes 300 may be arranged side by side at a certain distance apart from each other. After being inserted into tube insertion holes formed in the headers 130 and 230, the ends of the tubes 300 are fixed by brazing or the like to form a heat exchange medium flow path, through which the heat exchange medium passes and heat exchange occurs. At this time, multiple tube insertion holes are formed in the headers 130 and 230 so that the ends of the tubes 300 are inserted, and the multiple tubes 300 may be arranged side by side at a distance apart from each other in the longitudinal direction.

[0022] The fins 400 are interposed between the tubes 300, and may be joined to the tubes 300 by brazing or other means while positioned in contact with the tubes 300. The fins 400 are formed in a corrugated shape or the like, and play a role in increasing the heat exchange efficiency by increasing the heat dissipation surface area of ​​the heat exchange medium passing through the tubes 300.

[0023] Furthermore, the first header tank 100 and the second header tank 200 according to the present invention may each include headers 130 and 230, gaskets 120 and 220, tanks 110 and 210, and a pair of baffles 111 and 211. Here, the first header tank 100 and the second header tank 200 may be arranged so that their respective headers 130 and 230 face each other, and the first header tank 100 and the second header tank 200 may be formed with a symmetrical structure except for detailed embodiments.

[0024] The following will describe the detailed structure of the first header tank 100 as an example. Tank 110 is a part that connects with header 130 to form a space inside which a heat exchange medium can be stored and flowed. Tank 110 is formed in a concave container shape with one side open, and a connecting portion 112 is formed around the open end of tank 110, and the connecting portion 112 may be inserted into the gasket fixing groove 136 of header 130.

[0025] The header 130 has a gasket fixing groove 136 formed at its edge for inserting the gasket 120, and the gasket fixing groove 136 may be formed in a concave shape along the entire circumference of the header 130. The header 130 may also have a tube insertion hole into which the tube 300 is inserted. The header 130 may also have a plurality of grooves 131 formed in a concave shape, spaced apart around the outer edge of the gasket fixing groove 136. The portion between the grooves 131 may be formed by a bendable tab 132, and the bendable tab 132 may be bent inward to fix the joint 112 of the tank 110.

[0026] The gasket 120 may have a peripheral portion 121 formed in a shape corresponding to the shape of the gasket fastening groove 136 formed in the header 130. Alternatively, a pair of bridges 122 may be connected to both sides of the peripheral portion 121 in the width direction, and the pair of bridges 122 may be spaced apart from each other in the longitudinal direction. Alternatively, the peripheral portion 121 of the gasket 120 may be inserted into the gasket fastening groove 136 of the header 130, with the bridges 122 positioned on either side of a single tube insertion hole formed in the header 130, with the bridges 122 positioned between the tube insertion holes. Here, the bridges 122 are positioned opposite the header 130.

[0027] The baffles 111 are formed inside the tank 110 to partition the internal space of the tank 110, and the baffles 111 may be formed in a position corresponding to the bridge 122 of the gasket 120. That is, the baffles 111 may be arranged in pairs and spaced apart from each other in the longitudinal direction. Also, the positions of the pair of baffles 111 formed in the first header tank 100 and the positions of the pair of baffles 211 formed in the second header tank 200 may be formed at the same position relative to each other in the longitudinal direction.

[0028] This allows the header 130, tank 110, and gasket 120 to be joined together. The joint portion 112 of the tank 110 is inserted into the gasket fixing groove 136 of the header 130 while the gasket 120 is attached to the header 130. By pressing the header 130 and tank 110 together, the folded tab 132, which is formed to extend upward on the outside of the gasket fixing groove 136, is folded toward the tank 110, thereby joining the header 130, tank 110, and gasket 120. At this time, the peripheral portion 121 of the gasket 120 is pressed tightly against the header 130 and tank 110, and the bridge 122 of the gasket 120 is pressed tightly against the header 130 and baffle 111, allowing for a tightly joined connection.

[0029] As a result, the internal spaces of the first header tank 100 and the second header tank 200 are partitioned by a pair of baffles 111 and 211, and a first heat exchange section 1001 may be formed on the left side in the longitudinal direction, and a second heat exchange section 1002 may be formed on the right side, relative to the position where the pair of baffles 111 and 211 are formed. Furthermore, an inlet pipe and an outlet pipe may be formed in the first heat exchange section 1001 and the second heat exchange section 1002, respectively, and different heat exchange media may flow inside the first heat exchange section 1001 and the second heat exchange section 1002. The heat exchange media may be cooling water, and the heat exchanger of the present invention may be a radiator, and may be an integrated radiator in which low-temperature and high-temperature heat exchange media with different temperatures flow to one side and the other side partitioned by the baffles.

[0030] Here, the headers 130 and 230 of the first header tank 100 and the second header tank 200, respectively, may have a first groove 133 that is deeper than the groove 131, at a position corresponding to the space between a pair of baffles 111 and 211 in the longitudinal direction. Taking the first header tank 100 as an example, the space between the pair of baffles 111 in the longitudinal direction is the part where the first heat exchange section 1001 and the second heat exchange section 1002 are in contact with each other. In this part, the length change due to thermal expansion of the tubes 300 located in the heat exchange sections on both sides differs due to the temperature difference between the heat exchange sections on both sides, resulting in thermal deformation of the header. In this case, the present invention provides a structure that easily allows thermal deformation of the header 130 by providing the first groove 133 formed in the header 130, thereby reducing the thermal stress generated in the header 130 and the joint between the header 130 and the tubes 300 adjacent to this part, at the space between the first heat exchange section 1001 and the second heat exchange section 1002 of the header tank. Therefore, damage to the header and the joint between the header and the tube due to thermal stress caused by the temperature difference between the heat exchange sections on both sides can be prevented, thereby improving the reliability of the integrated heat exchanger.

[0031] The heat exchanger of the present invention may further include a dummy tube 310. The dummy tube 310 may be positioned longitudinally between a pair of baffles 111 and 211, and may be coupled in a manner in which both ends of the dummy tube 310 are connected to the first header tank 100 and the second header tank 200, similar to the tube 300. Here, the dummy tube 310 is hollow inside, and no heat exchange medium flows inside it, and the dummy tube 310 can serve to block heat transfer between the first heat exchange section 1001 and the second heat exchange section 1002. Also, the dummy tube 310 may be formed in the same shape as the tube 300, for example, so that the tube 300 and the dummy tube 310 can be easily used interchangeably. Furthermore, a first groove 133 may be formed on both sides of the dummy tube 310 between adjacent tubes 300, and preferably, the first groove 133 may be formed longitudinally at a position corresponding to the dummy tube 310. The first grooves 133 are formed on both sides of the header 130 in the width direction at positions corresponding to each other, making it easier for the header 130 to tolerate thermal deformation.

[0032] Figures 7 and 8 are a perspective view and a front view showing a portion of the header of a heat exchanger according to a second embodiment of the present invention. As shown in the figure, the pair of header tanks 100 and 200 of the heat exchanger according to the second embodiment of the present invention may have a second groove 134 further formed in each header. As an example, in the header 130 of the first header tank 100, a second groove 134 may be formed in the longitudinal direction, spaced apart from one or both sides of the first groove 133, and the second groove 134 may be formed to be deeper than the groove 131. That is, the second groove 134 is further formed adjacent to the first groove 133. In this case, the depth of the second groove 134 may be the same as that of the first groove 133. Furthermore, by distributing the thermal deformation outward in the longitudinal direction, using the portion where the first groove 133 is formed as a reference, and allowing it to occur (reducing thermal stress), damage to the header and the joint between the header and the tube can be prevented even more effectively.

[0033] Figures 9 and 10 are a perspective view and a front view showing a portion of the header of a heat exchanger according to a third embodiment of the present invention. As shown in the figure, a pair of header tanks 100 and 200 of a heat exchanger according to a third embodiment of the present invention may have a third groove 135 further formed in each header. For example, in the header 130 of the first header tank 100, a third groove 135 may be formed in the longitudinal direction, spaced apart on one or both sides of the first groove 133, and the third groove 135 may be formed to be deeper than the groove 131. That is, the third groove 135 is further formed adjacent to the first groove 133. In this case, the depth of the third groove 135 may be formed to be shallower than that of the first groove 133. In other words, the first groove 133 may be formed to be the deepest, the third groove 135 which is shallower in depth may be formed on the longitudinal side relative to the first groove 133, and then the groove 131 which is shallower than the third groove 135 may be formed.

[0034] This allows for gradual thermal deformation (reducing thermal stress) by distributing the deformation outward in the longitudinal direction, starting from the portion where the first groove 133 is formed, thereby more effectively preventing damage to the header and the joint between the header and the tube. Furthermore, the first groove 133 may be located between a pair of bridges 122 in the longitudinal direction. Also, if the line extending from the bottom of the recess of the groove 131 is defined as the groove reference line, the groove reference line may be positioned further away from the bottom surface of the header 130 than the extension line L of the contact surface between the tank 110 and the gasket 120. Also, if the line extending from the bottom of the recess of the first groove 133 is defined as the first groove reference line, the first groove reference line may be positioned further adjacent to the bottom surface of the header 130 than the extension line L of the contact surface between the tank 110 and the gasket 120. Also, if the line extending from the bottom of the recess of the third groove 135 is defined as the third groove reference line, the third groove reference line may be positioned further away from the bottom surface of the header 130 than the extension line L of the contact surface between the tank 110 and the gasket 120, or on the same line. In other words, generally, the groove 131 cannot prevent leakage unless it is formed to a depth where the gasket 120 is not visible. However, even if the gasket 120 is visible, if the first groove 133 is positioned adjacent to the dummy tube 310 through which the heat exchange medium does not flow, there is no possibility of heat exchange medium leakage. Therefore, the depth of the first groove 133 can be made deeper accordingly. However, the depth of the first groove 133 does not necessarily have to be formed so that the gasket 120 is visible; the depth of the first groove 133 can be freely formed independently of the joint 112 of the tank 110 and the gasket 120.

[0035] The present invention is not limited to the embodiments described above, and its scope of application is diverse. It goes without saying that a wide range of modifications can be made by a person with ordinary skill in the art to which the present invention belongs, without departing from the spirit of the invention as claimed in the claims. [Explanation of Symbols]

[0036] 100: First Header Tank 110: Tank 111: Baffle 112:Joining part 120: Gasket 121: Periphery 122: Bridge 130: Header 131: Groove 132: Folding tab 133: First trench 134: Second trench section 135: Third groove 136: Gasket fixing groove 200: Second Header Tank 210: Tank 211: Baffle 220: Gasket 221: Periphery 222: Bridge 230: Header 300: Tube 310: Dummy tube 400: Finn 1001: 1st heat exchange section 1002:Second heat exchange section

Claims

1. It includes a pair of header tanks spaced apart from each other and a plurality of tubes whose ends are connected to the pair of header tanks, The pair of header tanks are each, A header comprising a plurality of bendable tabs formed along the perimeter and spaced apart from each other, with a plurality of grooves formed between the plurality of bendable tabs that are concave from the end, A tank having its lower end inserted inside the header, with the bent tabs bent inward and joined to it, and which connects with the header to form a fluid space for the heat exchange medium, Each header of the pair of header tanks has a first groove that is deeper than the groove, It further includes at least one baffle that is coupled to one or more of the header and the tank to partition the internal space, The first groove is formed between the plurality of bent tabs, The baffles consist of a pair, spaced apart from each other in the longitudinal direction. The first groove is located between the pair of baffles in the longitudinal direction, A heat exchanger further comprising a dummy tube positioned between the tubes, with both ends connected to the pair of header tanks and connected between the pair of baffles.

2. The heat exchanger according to claim 1, characterized in that the baffle separates one side of the header tank from the other side, and the temperatures of the heat exchange medium flowing between the separated side and the other side are different from each other.

3. The heat exchanger according to claim 1, characterized in that the first grooves are formed on both sides of the header in the width direction at positions corresponding to each other.

4. Each header of the pair of header tanks has a second groove formed in the longitudinal direction, spaced apart on one or both sides of the first groove. The second groove is formed between the plurality of bent tabs, and the second groove is formed between the groove and the first groove. The heat exchanger according to claim 1, characterized in that the second groove is formed to be deeper than the first groove.

5. The heat exchanger according to claim 4, characterized in that the depth of the second groove is formed to be the same as the depth of the first groove.

6. Each header of the pair of header tanks has a third groove formed in the longitudinal direction, spaced apart on one or both sides of the first groove. The third groove is formed between the plurality of bent tabs, and the third groove is formed between the groove and the first groove. The heat exchanger according to claim 1, characterized in that the third groove is formed to be deeper than the first groove, and the first groove is formed to be deeper than the third groove.

7. The inside of the dummy tube is formed so that the heat exchange medium does not flow. The heat exchanger according to claim 1, characterized in that the dummy tube is formed in the same shape as the tube.

8. The heat exchanger according to claim 1, characterized in that the first groove is located between the tubes adjacent to the dummy tube on both sides.

9. The heat exchanger according to the present invention, characterized in that the first groove is formed at a position corresponding to the position of the dummy tube.

10. The heat exchanger according to claim 1, further comprising a gasket formed in a shape corresponding to the header, the tank, and the pair of baffles, and interposed between the header and the tank, and between the pair of baffles and the header, to ensure tight contact.

11. The header has a gasket mounting groove formed on its edge, and a gasket is inserted into the gasket mounting groove. The heat exchanger according to claim 10, characterized in that the tank has a joint portion that protrudes outward at its lower end, the joint portion is inserted into the gasket mounting groove of the header, and the gasket is pressed tightly between the gasket mounting groove and the joint portion.

12. The aforementioned gasket is A peripheral portion formed in a shape corresponding to the gasket mounting groove of the header, The set includes a pair of bridges, the ends of which are connected to both sides in the width direction of the circumferential portion and which are spaced apart from each other in the longitudinal direction to correspond to the positions of the pair of baffles, The heat exchanger according to claim 10, characterized in that the peripheral portion is inserted into the gasket mounting groove, and the pair of bridges are pressed and tightly fitted between the pair of baffles and the header.

13. The heat exchanger according to claim 12, characterized in that the first groove is located between the pair of bridges in the longitudinal direction.

14. If the line extending from the bottom of the recess in the groove is defined as the groove reference line, The heat exchanger according to claim 10, characterized in that the groove reference line is located further away from the bottom surface of the header than the contact surface between the tank and the gasket.

15. If the line extending from the bottom of the recess in the first groove is defined as the reference line of the first groove, The heat exchanger according to claim 10, characterized in that the first groove reference line is located further adjacent to the bottom surface of the header than the contact surface between the tank and the gasket.

16. Each of the headers of the pair of header tanks has a third groove formed in the longitudinal direction, spaced apart on one or both sides of the first groove, the third groove being deeper than the first groove, and the first groove being deeper than the third groove. If the line extending from the bottom of the recess in the third groove is defined as the reference line of the third groove, The heat exchanger according to claim 10, characterized in that the reference line of the third groove is located further away from the bottom surface of the header than the contact surface between the tank and the gasket, or is located on the same line.

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