Heat exchanger processing method and heat exchanger

Abstract

The present application provides a heat exchanger processing method and a heat exchanger. The heat exchanger processing method comprises: providing a first main component of a header, the first main component comprising a first wall surface and a second wall surface arranged in the thickness direction of the first main component; inserting a heat exchange tube into a first hole from the second wall surface, the first hole being formed in the first main component, the wall thickness of the first main component being defined as T1, and the distance from the tail end of the heat exchange tube after insertion into the first hole to the first wall surface being less than or equal to 0.5 T1; performing laser welding on the joint between the heat exchange tube and the first wall surface; and applying a connecting agent at the joint between the heat exchange tube and the second wall surface, and completing connection at the joint between the heat exchange tube and the second wall surface by means of the connecting agent. In the heat exchanger of the present application, laser welding is performed at the joint between the heat exchange tube and the first wall surface of the header, and connection at the joint between the heat exchange tube and the second wall surface of the header is achieved by means of the connecting agent, thereby improving the reliability of the joint between the header and the heat exchange tube, thus improving the reliability of the heat exchanger.

Description

Heat exchanger processing method and heat exchanger

[0001] Cross-reference to related applications

[0002] This application claims priority to and the benefit of Chinese Patent Application No. 202510779101.1, filed on June 11, 2025, and Chinese Patent Application No. 202411015161.8, filed on July 24, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of heat exchange, in particular to a heat exchanger processing method and a heat exchanger including a stainless steel tube. BACKGROUND

[0004] Heat exchangers are currently widely used in heat exchange systems. In the related art, in order to improve the corrosion resistance of the heat exchanger, the heat exchange tube and the header can be made of stainless steel. When the stainless steel heat exchange tube is welded with the stainless steel header, the heat exchange tube is inserted into the hole of the header. On the one hand, since the header and the heat exchange tube are both integral tubular structures, welding can only be performed on the outside of the tube at the connection between the header and the heat exchange tube. However, welding needs to be performed on the entire circumference of the connection between the header and the heat exchange tube. When the spacing between the heat exchange tubes of the heat exchanger is too small or when there are multiple rows of heat exchangers, some connections cannot be welded in place, and there may be a welding defect. On the other hand, since the wall thickness of the heat exchange tube is relatively thin, the heat exchange tube may be burned through when welded with the header, causing the heat exchanger to leak, affecting the welding reliability of the heat exchange tube and the header, and affecting the reliability of the heat exchanger. SUMMARY

[0005] The first aspect of the embodiments of the present application provides a heat exchanger processing method, which improves the welding reliability of the header and the heat exchange tube, reduces the risk of leakage of the heat exchanger, and improves the reliability of the heat exchanger.

[0006] The other aspect of the embodiments of the present application provides a heat exchanger, which is connected on both sides of the connection between the heat exchange tube and the header, reduces the risk of leakage of the heat exchanger, and has high reliability.

[0007] The present application provides a heat exchanger processing method, which includes: taking a first main body of a header, the first main body including a first wall surface and a second wall surface arranged along the thickness direction of the first main body, inserting a heat exchange tube into a first hole from the second wall surface, the first hole being provided in the first main body and penetrating through the first wall surface and the second wall surface, defining the wall thickness of the first main body as T1, and the distance of the heat exchange tube after being inserted into the first hole beyond the first wall surface being less than or equal to 0.5T1.

[0008] laser welding the connection between the heat exchange tube and the first wall surface;

[0009] applying a connecting agent to the connection between the heat exchange tube and the second wall surface, and connecting the connection between the heat exchange tube and the second wall surface.

[0010] In one aspect of the heat exchanger processing method, the heat exchange tube is inserted into the first hole from the second wall surface of the first main part of the header, laser welding is performed at the connection between the heat exchange tube and the first wall surface, and the distance between the end of the heat exchange tube after being inserted into the first hole and the first wall surface is less than or equal to 0.5T1. The connection between the heat exchange tube and the first wall surface of the header is plane welding when laser welding is performed, which can be applied to a heat exchanger with multiple rows or a small distance between heat exchange tubes, improves the applicability of the processing method, and reduces the risk of the heat exchange tube being easily burned through when the connection between the heat exchange tube and the second wall surface of the header is welded in an angle weld type, reduces the risk of leakage, and improves the welding reliability. In another aspect, the connection agent is used to connect the connection between the heat exchange tube and the second wall surface of the header, fills the gap at the connection between the heat exchange tube and the second wall surface of the header, reduces the risk of corrosion at the connection between the heat exchange tube and the second wall surface of the header, further improves the reliability of the connection between the header and the heat exchange tube, and improves the reliability of the heat exchanger.

[0011] In another aspect of the heat exchanger, the header is made of stainless steel, the header has a tube wall, the tube wall includes at least part of a first main part and at least part of a second main part, the first main part is provided with a first hole, the first hole penetrates through the first main part, the first main part further includes a first wall surface and a second wall surface arranged along the thickness direction of the first main part, the first wall surface is located in the lumen of the header, and the second wall surface is located outside the lumen of the header. The heat exchange tube is made of stainless steel, the end of the heat exchange tube is inserted into the first hole and communicates with the header, the connection between the heat exchange tube and the first wall surface forms a first welding part, and the connection between the heat exchange tube and the second wall surface forms a second connection part.

[0012] In the heat exchanger, the header and the heat exchange tube are made of stainless steel, the corrosion resistance of the heat exchanger is improved, the connection between the heat exchange tube and the first wall surface of the header forms a first welding part, the reliability of the connection between the header and the heat exchange tube is improved, the connection between the heat exchange tube and the second wall surface of the header forms a second connection part, and the connection is performed on both sides of the connection between the heat exchange tube and the header. Further reduce the risk of leakage at the connection between the heat exchange tube and the header, and improve the reliability of the heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0013] FIG. 1 is a structural schematic diagram of a heat exchanger according to an embodiment of the present application;

[0014] Fig. 2 is a partial perspective view of a heat exchanger according to an embodiment of the present application;

[0015] Fig. 3 is a partial perspective view of another heat exchanger according to an embodiment of the present application;

[0016] Fig. 4 is an enlarged view of A in Fig. 3;

[0017] Fig. 5 is a partial sectional view of a heat exchanger according to an embodiment of the present application during processing;

[0018] Fig. 6 is a partial sectional view of another heat exchanger according to an embodiment of the present application during processing;

[0019] Fig. 7 is a view of a first main body according to an embodiment of the present application;

[0020] Fig. 8 is a view of a second main body according to an embodiment of the present application;

[0021] Fig. 9 is a partial view of a heat exchanger according to an embodiment of the present application after welding;

[0022] Fig. 10 is an enlarged view of B in Fig. 3;

[0023] Fig. 11 is a view of another heat exchanger according to an embodiment of the present application;

[0024] Fig. 12 is a partial view of another heat exchanger according to an embodiment of the present application;

[0025] Fig. 13 is a partial view of another heat exchanger according to an embodiment of the present application.

[0026] Wherein: heat exchanger 100, header 1, first main body 11, first wall 11a, second wall 11b, first hole 111, second main body 12, tube wall 13, tube cavity 14, heat exchange tube 2, protruding portion 21, fin 3, first welding portion 4, second connecting portion 5, third welding portion 6, laser beam 7.

[0027] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0028] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the drawings, and the embodiments described below are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0029] It should be noted that the embodiments described are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other technical solutions obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] The terms used in the embodiments of the present application are merely for the purpose of describing particular embodiments and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0031] It should be understood that the term "and / or" used herein only describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent three cases of existence of A alone, existence of A and B simultaneously, and existence of B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0032] A heat exchanger processing method and a heat exchanger are described below with reference to the accompanying drawings.

[0033] The heat exchanger processing method of the embodiments of the present application comprises: taking a first main body 11 of a header 1, the first main body 11 comprising a first wall surface 11a and a second wall surface 11b arranged along the thickness direction of the first main body 11, a heat exchange tube 2 being inserted into a first hole 111 from the second wall surface 11b, the first hole 111 being arranged on the first main body 11, the first hole 111 penetrating through the first wall surface 11a and the second wall surface 11b, the wall thickness of the first main body 11 being defined as T1, the distance of the heat exchange tube 2 after being inserted into the first hole from the first wall surface 11a being less than or equal to 0.5T1; laser welding the connection between the heat exchange tube 2 and the first wall surface 11a; coating a connecting agent on the connection between the heat exchange tube 2 and the second wall surface 11b; and connecting the heat exchange tube 2 and the connection between the second wall surface 11b.

[0034] In the process of processing the heat exchanger 100, the first main body 11 of the header 1 is taken, the first main body 11 includes the first wall surface 11a and the second wall surface 11b arranged along the thickness direction of the first main body 11, the heat exchange pipe 2 is inserted into the first hole 111 arranged on the first main body 11, the header 1 is made of stainless steel, the heat exchange pipe 2 is made of stainless steel, the heat exchange pipe 2 can be multiple, the first hole 111 can also be multiple, one heat exchange pipe 2 is inserted into one first hole 111, and multiple heat exchange pipes 2 are respectively inserted into multiple first holes 111 of the header 1. When the heat exchange pipe 2 is inserted into the first hole 111, the heat exchange pipe 2 is inserted into the first hole 111 from the second wall surface 11b along the thickness direction of the first main body 11, that is, in the direction from the second wall surface 11b to the first wall surface 11a, and after the processing of the header 1 is completed, the second wall surface 11b is located outside the lumen of the header 1, and the first wall surface 11a is located inside the lumen of the header 1. The thickness direction of the first main body 11 is shown as the X direction in FIG. 1.

[0035] In some embodiments, as shown in FIG. 5, after the heat exchange pipe 2 is inserted into the first hole 111, the distance L1 between the end of the heat exchange pipe 2 and the first wall surface 11a in the thickness direction of the first main body 11, that is, in the X direction, is less than or equal to 0.5T1, which can be 0.5T1, 0.4T1, 0.3T1, 0.25T1, 0.2T1, 0.05T1, 0, etc., so that the heat exchange pipe 2 is flat welded at the first wall surface 11a connected with the header 1 during laser welding, and the welding reliability at the connection between the heat exchange pipe 2 and the first wall surface 11a of the header 1 is improved, the risk of leakage at the connection is reduced, and the reliability of the heat exchanger is improved. When L1 is greater than 0.5T1, the size of the heat exchange pipe 2 exceeding the first wall surface 11a of the header 1 is too large, and during laser welding, circumferential welding of the heat exchange pipe 2 or the first hole 111 of the header 1 cannot be guaranteed, which cannot form a good welding joint at the connection between the heat exchange pipe 2 and the first wall surface 11a of the header 1, causing poor welding at the connection between the heat exchange pipe 2 and the header 1, and there is a risk of leakage at the connection between the heat exchange pipe 2 and the first wall surface 11a of the header 1, which affects the reliability of the heat exchanger.

[0036] In some specific embodiments, after the heat exchange pipe 2 passes through the first hole 111, the distance L1 between the heat exchange pipe 2 and the first wall surface 11a is less than or equal to 1 mm, for example, which can be 1 mm, 0.8 mm, 0.65 mm, 0.5 mm, 0.2 mm, 0.05 mm, 0 mm, etc., so that the heat exchange pipe 2 is flat welded at the first wall surface 11a connected with the header 1, the welding reliability at the connection between the heat exchange pipe 2 and the first wall surface 11a of the header 1 is improved, the risk of leakage at the connection is reduced, and the reliability of the heat exchanger is improved.

[0037] In the related art, the heat exchange pipe 2 and the header 1 are both tubular structures, the heat exchange pipe 2 can only be welded on the outside of the header 1 or the heat exchange pipe 2 after being inserted into the header 1, when laser welding is performed, there is a certain angle at the connection between the heat exchange pipe 2 and the header 1, the connection between the heat exchange pipe 2 and the header 1 can only be welded in the form of an angle weld, and when welding, the periphery of the connection between the header 1 and the heat exchange pipe 2 needs to be welded, when the heat exchanger is a two-row or multi-row structure, the heat exchange pipes 2 are two rows or multiple rows, the spacing between the heat exchange pipes of adjacent rows is too small, or the spacing between the adjacent heat exchange pipes 2 in the length direction of the header 1 in a single-row heat exchanger is too small, the welding head cannot be inserted into some connections or the laser beam cannot be aligned with the connections, which results in that the connections cannot be welded in place, and the phenomenon of incomplete welding occurs, which causes the risk of leakage at the connection position; on the other hand, in order to improve the heat exchange efficiency, the size of the heat exchange pipe 2 is small and the wall thickness is thin, the laser welding is in the form of fusion welding, and when welding, the heat exchange pipe 2 with thin wall thickness has the risk of burning through, which causes the risk of leakage at the connection position.

[0038] In the present application, the heat exchange pipe 2 is inserted into the first hole 111 of the header 1 from the second wall surface 11b, laser welding is performed at the connection between the heat exchange pipe 2 and the first wall surface 11a of the header 1, and the distance by which the heat exchange pipe 2 exceeds the first hole 111 is less than or equal to 0.5T1, the connection between the heat exchange pipe 2 and the first wall surface 11a of the header 1 is flat welding, which can solve the problem of unreliable welding or the problem of inability to weld in a multi-row heat exchanger or a heat exchanger with small heat exchange pipe spacing, when the heat exchanger is a multi-row heat exchanger, the flat welding can be used to realize the welding of the heat exchange pipe 2 and the header 1, and when the heat exchanger is a single-row or multi-row heat exchanger, the flat welding can be used to realize a heat exchanger with small spacing between adjacent heat exchange pipes, which avoids the problem of inability to weld in place due to the small spacing between adjacent heat exchange pipes, improves the applicability of the processing method, and the connection between the heat exchange pipe 2 and the first wall surface 11a of the header 1 is flat welding, which can also be welded when the wall thickness of the heat exchange pipe 2 is thin, reduces the risk of burning of the heat exchange pipe 2, reduces the risk of leakage, improves the welding reliability of the connection between the heat exchange pipe 2 and the header 1, and thus improves the reliability of the heat exchanger.

[0039] After the heat exchange pipe 2 is inserted into the header 1, laser welding is performed at the connection between the heat exchange pipe 2 and the first wall surface 11a of the header 1, and the heat exchange pipe 2 and the header 1 are welded and connected. Laser welding is performed on the heat exchange pipe 2 and the header 1 made of stainless steel, the heat-affected zone of laser welding is small, which does not affect the adjacent welding points, the welding precision is higher, the welding speed is faster, and the welding reliability is high, which improves the reliability of the heat exchanger. The heat exchange pipe 2 and the header 1 can be laser welded at the first wall surface 11a by a laser vibration mirror, the welding precision is higher, and the welding reliability is improved, of course, laser welding can also be performed by other methods, which is not limited herein.

[0040] The connecting agent is coated at the connecting position of the heat exchange pipe 2 and the second wall surface 11b, and the connecting position of the heat exchange pipe 2 and the second wall surface 11b is connected. The connecting agent is used to complete the sealing connection of the connecting position of the heat exchange pipe 2 and the second wall surface 11b. The heat exchange pipe 2 is inserted into the header 1 along the thickness direction of the first main body from the second wall surface 11b. After the heat exchange pipe 2 is inserted into the header 1, the end of the heat exchange pipe 2 is located in the pipe of the header 1. The heat exchange pipe 2 is welded with the header 1 at the first wall surface 11a, and the welding connection of the heat exchange pipe 2 and the header 1 is realized. However, the other side of the connecting position of the heat exchange pipe 2 and the header 1, that is, the connecting position of the heat exchange pipe 2 and the second wall surface 11b is located outside the pipe of the header 1. There may be a gap at the connecting position. When the heat exchanger is used, it is exposed to the air. The gas and moisture in the air form a corrosive environment in the gap. The gap at the connecting position may cause corrosion, which may lead to leakage of the heat exchanger. Therefore, the connecting agent is coated at the connecting position of the heat exchange pipe 2 and the second wall surface 11b. The connecting agent is used to complete the sealing connection of the connecting position of the heat exchange pipe 2 and the second wall surface 11b. The gap at the connecting position of the heat exchange pipe 2 and the second wall surface 11b is filled, the risk of gap corrosion at the connecting position is reduced, the reliability of the connecting position of the heat exchange pipe 2 and the header 1 is further improved, and the reliability of the heat exchanger 100 is improved.

[0041] In the heat exchanger processing method, the connecting position of the heat exchange pipe 2 and the first wall surface 11a of the header 1 is laser welded. The distance between the end of the heat exchange pipe 2 inserted into the first hole 111 and the first wall surface is less than or equal to 0.5T1. When the connecting position of the heat exchange pipe 2 and the first wall surface 11a of the header 2 is laser welded, it is a flat welding. The applicability of the processing method is improved. The risk of burning through the heat exchange pipe when the pipe is welded on the outside as an angle weld is reduced. The risk of leakage of the heat exchanger is reduced. The connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 2 is sealed and connected by the connecting agent. The gap at the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1 is filled. The risk of corrosion at the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1 is reduced. The reliability of the connecting position of the header 1 and the heat exchange pipe 2 is further improved. The reliability of the heat exchanger is improved.

[0042] In some embodiments, when laser welding is performed, the laser beam is at a predetermined angle with the first wall surface 11a. The predetermined angle is in the range of 90°±5°.

[0043] In the embodiment, the laser beam 7 is arranged at a predetermined angle with the first wall surface 11a, and the predetermined angle is in the range of 90°±5°. The laser beam is arranged substantially perpendicular to the welding position, so that the laser beam 7 can be uniformly radiated on the welding position when laser welding is performed, so as to better weld the connection between the heat exchange tube 2 and the first wall surface 11a, reduce the welding unevenness caused by the welding angle inclination, or the welding position deviation caused by the welding angle inclination, and affect the welding reliability of the connection, thereby reducing the risk of the heat exchange tube 2 being burnt through when the heat exchange tube 2 and the header 1 are welded, reducing the risk of leakage, and improving the welding reliability.

[0044] In the embodiment, the laser beam 7 is arranged at a predetermined angle with the first wall surface 11a, and the predetermined angle is in the range of 90°±5°. The laser beam is arranged substantially perpendicular to the welding position, so that the laser beam 7 can be uniformly radiated on the welding position when laser welding is performed, so as to better weld the connection between the heat exchange tube 2 and the first wall surface 11a, reduce the welding unevenness caused by the welding angle inclination, or the welding position deviation caused by the welding angle inclination, and affect the welding reliability of the connection, thereby reducing the risk of the heat exchange tube 2 being burnt through when the heat exchange tube 2 and the header 1 are welded, reducing the risk of leakage, and improving the welding reliability.

[0045] In some embodiments, the header 1 further comprises a second main body 12, and the first main body 11 and the second main body 12 are welded to complete the welding of the header 1.

[0046] As shown in FIGS. 1-4 and 7-8, the header 1 comprises a first main body 11 and a second main body 12, and a pipe wall 13 of the header 1 comprises at least part of the first main body 11 and at least part of the second main body 12. The at least part of the first main body 11 and the at least part of the second main body 12 are enclosed to form a pipe cavity 14 of the header 1. The first main body 11 and the second main body 12 are welded to complete the sealed connection of the header 1.

[0047] In the working state of the heat exchanger, the heat exchange medium such as water and refrigerant flows in the header 1. The sealed connection of the first main body 11 and the second main body 12 achieved by welding can improve the reliability of the connection, improve the strength of the header, reduce the risk of leakage at the connection between the first main body 11 and the second main body 12 of the heat exchanger, and improve the reliability of the heat exchanger.

[0048] It can be understood that, after laser welding the heat exchange pipes 2 inserted into the header on the side of the first wall surface 11a of the first main body 11, the first main body 11 and the second main body 12 can be welded to complete the welding and sealing of the header 1; or after welding the heat exchange pipes 2 and the first wall surface 11a, the heat exchange pipes 1 can be installed or welded with other components, and then the first main body 11 and the second main body 12 of the header 1 can be welded. This is not limited here.

[0049] In the welding of the first main body 11 and the second main body 12, the first main body 11 and the second main body 12 can be assembled together first. In order to facilitate welding and prevent welding deformation, the welds of the first main body 11 and the second main body 12 can be spot welded in advance to fix the positions of the first main body 11 and the second main body 12, and then the first main body 11 and the second main body 12 can be welded to complete the welding and sealing of the header 1, thereby improving the processing reliability.

[0050] In the welding of the first main body 11 and the second main body 12, the first main body 11 and the second main body 12 can be assembled together first. In order to facilitate welding and prevent welding deformation, the welds of the first main body 11 and the second main body 12 can be spot welded in advance to fix the positions of the first main body 11 and the second main body 12, and then the first main body 11 and the second main body 12 can be welded to complete the welding and sealing of the header 1, thereby improving the processing reliability.

[0051] In some embodiments, in the step of inserting the plurality of heat exchange pipes 2 into the first holes 111, the first main body 11 is fixed, and the plurality of heat exchange pipes 2 inserted into the first holes 111 remain in the same position.

[0052] In some embodiments, in the step of inserting the plurality of heat exchange pipes 2 into the first holes 111, the first main body 11 is fixed, and the plurality of heat exchange pipes 2 inserted into the first holes 111 remain in the same position.

[0053] In some embodiments, when the heat exchanger is processed, the heat exchanger can be as shown in FIG. 1 and FIG. 2, the heat exchanger is a single-row structure, and a plurality of heat exchange pipes 2 are arranged at intervals along the length direction of the header 1, and the length direction of the header 1 is as shown in the Z direction in FIG. 1; the heat exchanger can also be as shown in FIG. 3, the heat exchanger is a two-row or multi-row structure, and at this time the heat exchange pipes 2 are also a two-row or multi-row structure, and a plurality of heat exchange pipes 2 need to be welded and connected with the header 1. In the process of inserting a plurality of heat exchange pipes 2 into the first hole 111 of the header 1, by fixing the first main body 11, the plurality of heat exchange pipes 2 are kept at the same position after being inserted into the first hole 111, which improves the consistency of processing, facilitates more accurate welding position in the subsequent process, improves the welding quality of the connection between the heat exchange pipe 2 and the first wall surface 11a, and improves the reliability of the heat exchanger processing and the reliability of the heat exchanger.

[0054] Among them, the first main body 11 can be fixed by placing a tool close to the first wall surface 11a, the heat exchange pipe 2 inserted into the first hole 111 can be limited, or the limiting structure on the processing device can be used, or the positioning protrusion part can be provided on the heat exchange pipe 2, or other ways can be used for limiting, which are not limited here.

[0055] In some embodiments, after the heat exchange pipe 2 is inserted into the first hole 111, the distance between the end of the heat exchange pipe 2 and the first wall surface 11a in the thickness direction of the first main body is less than or equal to 0.25T1.

[0056] Among them, as shown in FIG. 6, after the heat exchange pipe 2 is inserted into the first hole 111, the distance L2 between the end of the heat exchange pipe 2 and the first wall surface 11a in the thickness direction X of the first main body 11 is less than or equal to 0.25T1, that is, the distance L2 between the end of the heat exchange pipe 2 and the first wall surface 11a does not exceed 0.25T1, for example, it can be 0.25T1, 0.2T1, 0.16T1, 0mm, etc., so that when the connection between the heat exchange pipe 2 and the first wall surface 11a is welded, it is basically a flat welding, which improves the welding reliability and reduces the risk of leakage at the connection. When the heat exchange pipe 2 does not completely pass through the first hole 111, and the distance L2 between the end of the heat exchange pipe 2 and the first wall surface 11a exceeds 0.25T1, when the heat exchange pipe 2 and the first wall surface 11a of the header 1 are welded, the melted base material of the header 1 cannot completely spread to the connection between the header 1 and the heat exchange pipe 2, which may cause problems such as virtual welding, leakage welding, penetration and other welding defects at the connection between the heat exchange pipe 2 and the first wall surface 11a, and the heat exchanger may leak, thereby reducing the qualified rate of the heat exchanger processing and reducing the processing reliability.

[0057] In some embodiments, after the heat exchange tube 2 is inserted into the first hole 111, the distance L2 from the end of the heat exchange tube 2 to the first wall surface 11a in the thickness direction X of the first body piece 11 is less than or equal to 0.5 mm, for example, 0.5 mm, 0.4 mm, 0.3 mm, 0.15 mm, 0 mm, etc., which improves the welding reliability.

[0058] In some embodiments, as shown in FIGS. 5 and 6, after the heat exchange tube 2 is inserted into the first hole 111, the distance L1 from the end of the heat exchange tube 2 to the first wall surface 11a in the thickness direction of the first body piece 11 is less than or equal to 0.5T1, and the distance L2 from the end of the heat exchange tube 2 to the first wall surface 11a is less than or equal to 0.25T1, that is, after the heat exchange tube 2 is inserted into the first hole 111, the distance from the end of the heat exchange tube to the first wall surface 11a is between -0.25T1 and 0.5T1. In this range, when welding the connection between the heat exchange tube 2 and the first wall surface 11a, it is generally flat welding, and welding can be better achieved. The problem of poor welding at the connection between the heat exchange tube 2 and the first wall surface 11a of the header is reduced, the welding reliability is improved, the risk of leakage at the connection is reduced, and the reliability of the heat exchanger is improved.

[0059] In some embodiments, after the heat exchange tube 2 is inserted into the first hole 111, the gap between the outer wall of the heat exchange tube and the first body piece in the direction perpendicular to the thickness direction of the first body piece 11 is less than or equal to 0.05 mm.

[0060] In some embodiments, as shown in FIG. 5, after the heat exchange tube 2 is inserted into the first hole 111, the single-sided gap L3 between the outer wall of the heat exchange tube 2 and the first body piece in the direction perpendicular to the thickness direction of the first body piece 11 is less than or equal to 0.05 mm. On the one hand, when the outer wall of the heat exchange tube 1 is inserted into the first hole 111, there is a certain gap, which makes it more convenient to insert, and after welding, a certain welding part is formed in the gap, which improves the welding reliability. On the other hand, by controlling the size L3 to be less than or equal to 0.05 mm, when the heat exchange tube 1 is inserted into the first hole 111 and the heat exchange tube 1 and the first body piece 11 are welded, the problem of insufficient welding caused by excessive gap is reduced, the welding reliability of the heat exchange tube 1 and the first body piece 11 is improved, the risk of leakage is reduced, and the reliability of the connection between the heat exchange tube 2 and the header 1 is improved.

[0061] In some embodiments, in the laser welding step, the profile of the connection between the heat exchange tube 2 and the first wall surface 11a is scanned, and after the position to be welded is confirmed, the connection between the heat exchange tube 2 and the first wall surface 11a is laser welded.

[0062] Wherein, since multiple heat exchange pipes 2 are welded with the header 1, there are multiple welding points during laser welding, and each heat exchange pipe 2 is welded with the first wall surface 11a of the header 1 at the connection position in the circumferential direction. If the heat exchange pipe 2 or the header 1 is tilted or offset during assembly, the offset position may cause false welding or missed welding during welding of the heat exchange pipe 2 and the header 1, affecting the welding reliability. During laser welding, a visual detection device can be selected to connect with the welding device. The visual detection device scans the profile of the connection position between the heat exchange pipe 2 and the first wall surface 11a, compares it with the pre-stored welding profile, confirms the welding position, and then performs laser welding on the connection position between the heat exchange pipe 2 and the first wall surface 11a. If the welding position is correct, normal welding is performed. If the position is offset or exceeds the set value, the welding is stopped and a reminder is issued. After re-adjustment, welding is performed again, thereby improving the position accuracy during laser welding, improving the welding consistency of the heat exchange pipe 2 and the header 1, ensuring the welding quality, and improving the welding efficiency and welding reliability.

[0063] In some embodiments, the connecting agent is a paste solder, and the paste solder includes aluminum-silicon solder paste. The connection position between the heat exchange pipe 2 and the second wall surface 11b is welded and connected.

[0064] The connecting agent can be a paste solder, which is convenient to apply to the connection position between the heat exchange pipe 2 and the second wall surface 11b. When the heat exchanger 100 is processed, the heat exchanger 100 is in a horizontal state. At this time, the length direction of the header 1 and the length direction of the heat exchange pipe 2 are parallel to the horizontal plane. When the paste solder is applied to the connection position between the heat exchange pipe 2 and the second wall surface 11b, the paste solder will flow downward along the heat exchange pipe 2. Due to the capillary effect, the solder will be adsorbed in the circumferential direction of the connection position between the heat exchange pipe 2 and the header 1. Thus, the solder is guaranteed at the circumferential direction of the connection position between the header 1 and the heat exchange pipe 2. During high-temperature welding, the solder melts and spreads, and after cooling and solidification, the connection position between the heat exchange pipe 2 and the second wall surface 11b is welded and connected, thereby realizing the sealed connection of the connection position between the heat exchange pipe 2 and the second wall surface 11b, reducing the probability of gap corrosion, and improving the service life and reliability of the heat exchanger.

[0065] The paste solder includes aluminum-silicon solder paste. The connection position between the heat exchange pipe 2 and the second wall surface 11b of the header 1 is brazed. During brazing, the filler metal and the base metal of the stainless steel heat exchange pipe 2 and the stainless steel header 1 diffuse with each other, forming a brazing transition zone mainly composed of aluminum-silicon-iron on the surface of the heat exchange pipe 2 and / or the header 1, thereby increasing the welding strength, improving the welding reliability, and improving the reliability of the heat exchanger.

[0066] When the connecting agent is a paste solder, the paste solder can be applied to the connection between the heat exchange tube 2 and the second wall surface 11b of the header 1 before the heat exchange tube 2 and the fin 3 are welded, and then the connection between the heat exchange tube 2 and the second wall surface 11b of the header 1 is simultaneously soldered during the furnace brazing of the heat exchange tube 2 and the fin 3, thereby reducing the processing steps and improving the processing efficiency of the heat exchanger.

[0067] When the paste solder is applied, the amount of solder used can be calculated according to the gap size of the weld between the heat exchange tube 2 and the second wall surface 11b of the header 1, and then the solder is uniformly applied to both sides of the connection between the heat exchange tube 2 and the second wall surface 11b of the header 1. The flowability of the paste solder itself allows the solder to flow to both sides of the heat exchange tube 2, filling the gap between the heat exchange tube 2 and the second wall surface 11b of the header 1, reducing the risk of gap corrosion at the connection, and improving the processing reliability of the heat exchanger.

[0068] The paste solder includes solder, flux, and adhesive, and has at least one of the following characteristics: the solder accounts for 45-65% of the paste solder; the flux accounts for 15-30% of the paste solder; and the adhesive accounts for 5-40% of the paste solder. The solder accounts for 45-65% of the paste solder and is used for brazing. When high-temperature welding is performed, the solder melts and fills the gap. The flux accounts for 15-30% of the paste solder and is used to break the oxide film on the surface of the heat exchange tube 2 or the header 1 to achieve welding. The adhesive accounts for 5-40% of the paste solder and facilitates the adhesion and fixation of the paste solder, making it easier for the paste solder to adhere within a certain concentration. The use of the paste solder makes it easier for the paste solder to be uniformly applied to the connection between the heat exchange tube 2 and the second wall surface 11b of the header 1, thereby improving the welding reliability of the connection.

[0069] The paste solder can be applied by manual or automatic coating machines, or other methods, which are not limited herein.

[0070] In some embodiments, the connecting agent is an adhesive, and after the heat exchange tube 2 and the fin 3 are welded, the adhesive connection between the heat exchange tube 2 and the second wall surface 11b is performed.

[0071] The connecting agent can be an adhesive. After the welding of the heat exchange pipe 2 and the fin 3 is completed, the adhesive is applied at the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1. The adhesive fills the gap at the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1 and the surrounding of the gap by flowing. After the adhesive is cured, a protective adhesive layer is formed at the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1, thereby achieving the sealed connection of the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1, filling the gap at the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1, reducing the risk of gap corrosion at the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1, and improving the reliability of the heat exchanger. When the adhesive is used to connect the gap, the processing is more convenient.

[0072] The adhesive can be an epoxy resin or other adhesive, which is not limited herein.

[0073] When the adhesive is applied, the amount of the adhesive can be calculated according to the size of the gap at the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1, and then the adhesive is uniformly applied around the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1. The adhesive flows into the gap between the heat exchange pipe 2 and the header 1 and the surrounding of the gap, fills the gap at the connecting position of the heat exchange pipe 2 and the second wall surface 11b of the header 1, reduces the risk of gap corrosion at the connecting position, and improves the processing reliability of the heat exchanger.

[0074] The connecting agent can be applied by manual or automatic coating machine, or other ways, which are not limited herein.

[0075] In some embodiments, the heat exchange pipe 2 and the fin 3 are assembled, and the fin 3 and the heat exchange pipe 2 are welded.

[0076] The assembling of the heat exchange pipe 2 and the fin 3 includes installing the fin 3 between adjacent heat exchange pipes 2, or inserting the heat exchange pipe 2 into the fin 3, and then welding the fin 3 and the heat exchange pipe 2, thereby increasing the heat exchange effect of the heat exchanger.

[0077] The assembling step of the heat exchange pipe 2 and the fin 3 can be before or after the heat exchange pipe 2 is inserted into the first main body 11, or before or after the first main body 11 and the second main body 12 are welded, which is not limited herein.

[0078] In some embodiments, when processing the heat exchanger as shown in Figs. 1-3, the fins 3 can be installed between the adjacent heat exchange tubes 2 after the heat exchange tubes 2 are inserted into the first body member 11, and then the assembled heat exchange tubes 2 and fins 3 are bundled, and then the first wall surface 11a of the first body member 11 of the header 1 is welded to the heat exchange tubes 2, and then the first body member 11 and the second body member 12 of the header 1 are welded, and then the heat exchange tubes 2 and the fins 3 are furnace welded to complete the welding of the heat exchanger. It can be understood that the heat exchange tubes 2 and the first body member 11 can be welded first after the heat exchange tubes 2 are inserted into the first body member 11, and then the fins 3 can be installed between the adjacent heat exchange tubes 2, and then the fins 3 and the heat exchange tubes 2 can be welded.

[0079] In some embodiments, when processing the heat exchanger as shown in Figs. 11-12, the heat exchange tubes 2 and the first body member 11 can be welded first, and then the first body member 11 and the second body member 12 of the header 1 are welded, and then the heat exchange tubes 2 are pressed into the through grooves of the plurality of fins 3 from the side after the welding of the heat exchange tubes 2 and the header 1 is completed, and then the heat exchange tubes 2 and the fins 3 are assembled and welded. It can be understood that the heat exchange tubes 2 and the fins 3 can be assembled first, and then the heat exchange tubes 2 can be inserted into the first body member 11, and then the heat exchange tubes 2 and the first body member 11 can be welded, and then the first body member 11 and the second body member 12 of the header 1 are welded, and then the heat exchange tubes 2 and the fins 3 are furnace welded.

[0080] In some embodiments, when processing the heat exchanger as shown in Fig. 13, the heat exchange tubes 2 can be inserted into the fin holes of the plurality of fins 3 first, and then the two ends of the heat exchange tubes 2 are inserted into the first holes 111 of the header 1, and then the heat exchange tubes 2 and the first body member 11 are welded, and then the first body member 11 and the second body member 12 of the header 1 are welded, and then the heat exchange tubes 2 and the fins 3 are welded.

[0081] In some embodiments, the heat exchange tubes 2 and the fins 3 can be connected by brazing, and before the heat exchange tubes 2 and the fins 3 are brazed, a paste solder is applied to the connection between the heat exchange tubes 2 and the second wall surface 11b, and then the heat exchange tubes 2 and the fins 3 are brazed, and the brazing simultaneously completes the welding connection of the heat exchange tubes 2 and the fins 3 and the welding of the connection between the heat exchange tubes 2 and the second wall surface 11b to obtain the heat exchanger product.

[0082] In some embodiments, after the welding of the heat exchange tubes 2 and the first wall surface 11a and the welding of the heat exchange tubes 2 and the fins 3 are completed, an adhesive is applied to the connection between the heat exchange tubes 2 and the second wall surface 11b, and after the adhesive is cured, the connection between the heat exchange tubes 2 and the second wall surface 11b is completed to improve the reliability of the heat exchanger.

[0083] The embodiment of the present application also provides a heat exchanger 100 which can be processed by the heat exchanger processing method. The heat exchanger 100 comprises a header 1 made of stainless steel, the header 1 has a pipe wall 13, the pipe wall 13 comprises at least part of a first main body 11 and at least part of a second main body 12, the first main body 11 is provided with a first hole 111 which penetrates the first main body 11, the first main body 11 further comprises a first wall surface 11a and a second wall surface 11b which are arranged along the thickness direction of the first main body 11, the first wall surface 11a is located in a pipe cavity 14 of the header 1, and the second wall surface 11b is located outside the pipe cavity 14 of the header 1; a heat exchange pipe 2 made of stainless steel, the heat exchange pipe 2 penetrates the first hole 111 and communicates with the header 1; the connection between the heat exchange pipe 2 and the first wall surface 11a forms a first welding part 4, and the connection between the heat exchange pipe and the second wall surface 11b forms a second welding part 5.

[0084] As shown in FIGS. 1-13, the heat exchanger 100 comprises a header 1 and a heat exchange pipe 2, the header 1 is made of stainless steel, and the heat exchange pipe 2 is made of stainless steel, and the heat exchanger 100 can be applied to the fields of refrigeration, heating, ventilation, air conditioning, water tank heat exchanger, etc. In the use state, the header 1 and the heat exchange pipe 2 circulate refrigerant or water and other heat exchange media, and if the header 1, or the heat exchange pipe 2, or the connection between the header 1 and the heat exchange pipe 2 leaks, the heat exchanger will leak, which affects the reliability and service life of the heat exchanger. The header 1 and the heat exchange pipe 2 are made of stainless steel, which improves the corrosion resistance of the heat exchanger and prolongs the service life of the heat exchanger.

[0085] The pipe wall 13 of the header 1 comprises at least part of the first main body 11 and at least part of the second main body 12, and the at least part of the first main body 11 and the at least part of the second main body 12 enclose the pipe cavity 14 of the header 1, the first main body 11 is provided with the first hole 111 which facilitates the insertion of the heat exchange pipe 2, and the first hole 111 can be multiple. The first main body 11 comprises the first wall surface 11a and the second wall surface 11b which are oppositely arranged along the thickness direction of the first main body 11, the first wall surface 11a is located in the pipe cavity 14, and the second wall surface 11b is located outside the pipe cavity 14. When the heat exchange pipe 2 is inserted into the header 1 along the first hole 111, the heat exchange pipe 2 penetrates into the first hole 111 of the header 1 along the direction from the second wall surface 11b to the first wall surface 11a; after the heat exchange pipe 2 penetrates into the first hole 111, the heat exchange pipe 2 communicates with the header 1.

[0086] The heat exchange pipe 2 and the header 1 form a first welding portion 4 at the connection of the first wall surface 11a, and the heat exchange pipe and the header 1 form a second connection portion 5 at the connection of the second wall surface 11b. In the related art, since the heat exchange pipe 2 and the header 1 are both tubular structures, after the heat exchange pipe 2 is inserted into the header 1, the heat exchange pipe 2 and the header 1 can only be welded at the connection of the heat exchange pipe 2 and the header 1 on the outside of the header 1. When welding on the outside of the pipe, since there are multiple heat exchange pipes, some positions can be blocked, and the connection is a fillet weld, which can cause poor welding and leakage, affecting the reliability of the heat exchanger 100.

[0087] In the present application, the heat exchange pipe 2 is inserted into the first hole 111 of the header 1, the first wall surface 11a and the second wall surface 11b of the heat exchange pipe 2 and the header 1 are connected, the heat exchange pipe 2 and the header 1 form a first welding portion 4 at the connection of the first wall surface 11a, and the heat exchange pipe 2 and the header 1 are welded at the first wall surface 11a, which improves the reliability of the connection of the heat exchange pipe 2 and the header 1 at the first wall surface 11a, and the heat exchange pipe and the header 1 form a second connection portion 5 at the connection of the second wall surface 11b, and the heat exchange pipe 2 and the header 1 are connected on both sides, which reduces the risk of corrosion of the heat exchange pipe 2 and the header 1 at the connection of the second wall surface 11b, further improves the reliability of the connection of the heat exchange pipe 2 and the header 1, and improves the reliability of the heat exchanger 100.

[0088] It can be understood that the first body part 11 can have a flat structure near the first hole 111, as shown in FIG. 7, to facilitate plane welding with the heat exchange pipe 2 inserted into the first hole 111; the second body part 12 can have a flat structure, as shown in FIG. 8, or an arc structure or other structure, which is not limited herein, for example, the second body part 12 has an arc structure, and the formed header 1 can have a D-shaped structure; the first body part 11 and the second body part 12 cooperate to form a tubular header 2, and the specific structure of the first body part 11 and the second body part 12 cooperating to form the header 2 is not limited. The first body part 11 and / or the second body part 12 can also be provided with an opening to connect the inlet and outlet pipes, facilitating the flow of heat exchange medium in and out. The heat exchange pipe 2 can be flat or oval in the figure, or a circular heat exchange pipe, or other shapes, which are not limited herein.

[0089] The heat exchanger 100 according to an embodiment of the present application, by forming the first welding portion 4 at the connection between the heat exchange tube 2 and the header 1 at the first wall surface 11a, and by welding at the first wall surface 11a, the reliability of the connection between the heat exchange tube 2 and the header 1 at the first wall surface 11a is improved, and by forming the second connection portion 5 at the connection between the heat exchange tube 2 and the header 1 at the second wall surface 11b, the connection at both sides of the connection between the heat exchange tube 2 and the header 1 is performed, the reliability of the connection between the header 1 and the heat exchange tube 2 is improved, and the risk of corrosion at the connection between the heat exchange tube 2 and the header 1 at the second wall surface 11b is reduced, and the reliability of the heat exchanger 100 is improved.

[0090] In some embodiments, the first welding portion 4 is formed by laser welding.

[0091] As shown in FIG. 9, the first welding portion 4 is formed by welding at the connection between the heat exchange tube 2 and the first wall surface 11a of the header 1, the heat exchange tube 2 is inserted into the first hole 111 of the header 1, and laser welding is performed at the connection between the stainless steel heat exchange tube 2 and the first wall surface 11a of the stainless steel header 1, and the first wall surface 11a is located inside the header 1, so that the connection between the heat exchange tube 2 and the first wall surface 11a of the header 2 is flat when welding, reducing the risk of the heat exchange tube being easily burned through when welding on the outside of the tube as an angle weld type; in addition, the heat-affected zone of laser welding is small, which will not affect the adjacent welding points, and the welding precision is higher, the welding speed is faster, and the welding reliability is high. The first welding portion 4 formed by laser welding forms a certain depth of penetration, so that the connection between the heat exchange tube 2 and the header 1 formed thereby has high reliability and high pressure resistance, improving the reliability of the heat exchanger.

[0092] In some embodiments, the first welding portion 4 is arranged along the circumference of the heat exchange tube 2.

[0093] The heat exchange tube 2 and the first wall surface 11a of the header 1 are welded to form the first welding portion 4 at the connection between the heat exchange tube 2 and the first wall surface 11a of the header 1, i.e. along the circumference of the heat exchange tube 2, the first welding portion 4 is formed at the connection between the circumference of the heat exchange tube 2 and the first wall surface 11a, as shown in FIG. 4, the connection between the heat exchange tube 2 and the first wall surface 11a extends along the circumference of the heat exchange tube 2, after laser welding at the connection between the heat exchange tube 2 and the first wall surface 11a, as shown in FIG. 9, the first welding portion 4 is formed at the connection between the circumference of the heat exchange tube 2 and the first wall surface 11a, the first welding portion 4 extends along the circumference of the heat exchange tube 2, and multiple first welding portions 4 are formed at the connection between multiple heat exchange tubes 2 and the first wall surface 11a, thereby forming a good welding joint at the connection between the heat exchange tube 2 and the first main body 11, ensuring the sealing of the connection between the heat exchange tube 2 and the header 1, reducing the risk of leakage at the connection between the heat exchange tube 2 and the first wall surface 11a, and improving the strength and reliability of the connection between the heat exchange tube 2 and the header 1, thereby improving the reliability of the heat exchanger.

[0094] In some embodiments, the second connecting part 5 is formed by welding, or the second connecting part 5 is formed by gluing.

[0095] In some embodiments, as shown in FIG. 9, the second connecting part 5 is formed by welding, and a paste solder is coated at the connecting part of the heat exchange pipe 2 and the second wall surface 11b. The paste solder can be an aluminum-silicon solder. After welding, the second connecting part 5 includes a transition zone mainly composed of aluminum-silicon-iron. The second connecting part 5 is a brazing corner formed by brazing at the connecting part of the heat exchange pipe 2 and the second wall surface 11b of the header 1. The transition zone mainly composed of aluminum-silicon-iron is formed on the surface of the heat exchange pipe 2 and the header 1, thereby achieving good welding. Of course, the second connecting part 5 can also include an aluminum-silicon compound, which can be located between the aluminum-silicon-iron transition zone on the surface of the heat exchange pipe 2 and the aluminum-silicon-iron transition zone on the surface of the header 1. Since the connecting part of the heat exchange pipe 2 and the second wall surface 11b of the header 1 is located on the outside of the header 1 and is exposed to the air during the application of the heat exchanger, the gases and moisture in the air form a corrosive environment in the gap. By welding the connecting part of the heat exchange pipe 2 and the second wall surface 11b of the header 1, the aluminum-silicon in the brazing filler metal and the base metal of the stainless steel heat exchange pipe 2 dissolve and diffuse into each other during welding, forming a brazing transition zone mainly composed of aluminum-silicon-iron on the surface of the stainless steel base metal. The gap at the connecting part of the heat exchange pipe 2 and the second wall surface 11b is filled, reducing the risk of gap corrosion at the connecting part, increasing the welding strength and reliability, reducing the risk of leakage, and improving the reliability of the heat exchanger 100.

[0096] In some embodiments, the second connecting part 5 is formed by brazing after coating a paste solder. The paste solder includes brazing filler metal, flux, and adhesive. The paste solder has at least one of the following characteristics: the brazing filler metal accounts for 45-65% of the paste solder; the flux accounts for 15-30% of the paste solder; and the adhesive accounts for 5-40% of the paste solder.

[0097] In some embodiments, the connecting part of the heat exchange pipe 2 and the second wall surface 11b of the header 1 forms the second connecting part 5 by brazing. In order to achieve brazing connection at the connecting part of the heat exchange pipe 2 and the second wall surface 11b of the header 1, a paste solder needs to be coated at the connecting part of the heat exchange pipe 2 and the second wall surface 11b of the header 1 for brazing. The main components of the paste solder include brazing filler metal, flux, and adhesive.

[0098] The brazing filler metal accounts for 45-65% of the paste-like solder, and is used for brazing. During high-temperature welding, the brazing filler metal melts and fills into the gap. The flux accounts for 15-30% of the paste-like solder, and is used for destroying the oxide film on the surface of the heat exchange tube 2 or the header 1 to realize welding. The adhesive accounts for 5-40% of the paste-like solder, and is beneficial to the adhesion and fixation of the paste-like solder, so that the paste-like solder is more convenient to adhere within a certain concentration.

[0099] In some embodiments, as shown in FIG. 9, the second connecting part 5 is formed by gluing, that is, the connection between the heat exchange tube 2 and the second wall surface 11b of the header 1 is formed by gluing. An adhesive is coated at the connection between the heat exchange tube 2 and the second wall surface 11b, and the adhesive flows to fill into the gap and around the gap at the connection between the heat exchange tube 2 and the second wall surface 11b. After the adhesive is cured, a protective glue layer is formed on the surface of the heat exchange tube 2 and the header 1, realizing the connection at the connection between the heat exchange tube 2 and the second wall surface 11b, filling the gap at the connection between the heat exchange tube 2 and the second wall surface 11b, reducing the risk of corrosion of the gap at the connection, and improving the reliability of the heat exchanger. When the adhesive is used to seal and connect the gap, the heat exchanger is more convenient to process and has lower cost.

[0100] In some embodiments, the second connecting part 5 is arranged along the circumference of the heat exchange tube 2.

[0101] The second connecting part 5 is located at the connection between the heat exchange tube 2 and the second wall surface 11b of the header 1, that is, the second connecting part 5 is formed at the connection between the circumference of the heat exchange tube 2 and the second wall surface 11b. As shown in FIG. 10, the connection between the heat exchange tube 2 and the second wall surface 11b extends along the circumference of the heat exchange tube 2. After the connection between the heat exchange tube 2 and the second wall surface 11b is welded or glued, the second connecting part 5 is formed at the connection between the circumference of the heat exchange tube 2 and the second wall surface 11b, as shown in FIG. 9, the second connecting part 5 extends along the circumference of the heat exchange tube 2, and multiple second connecting parts 5 are formed at the connections between multiple heat exchange tubes 2 and the second wall surface 11b. Thus, the heat exchange tube 2 and the header 1 form a good connection area at the connection, ensuring the sealing of the connection between the heat exchange tube 2 and the header 1, reducing the risk of corrosion and leakage at the connection between the heat exchange tube 2 and the second wall surface 11b, and improving the strength and reliability of the connection between the heat exchange tube 2 and the header 1.

[0102] In some embodiments, the thickness of the first main body part 11 is defined as T1, the thickness of the heat exchange tube 2 is defined as T2, the size S1 of the first welding part 4 in the thickness direction of the first main body part 11 satisfies: 2*T2≤S1≤T1, and / or the size S2 of the first welding part 11 in the direction perpendicular to the thickness direction of the first main body part 11 satisfies: S2≥2*T2+L3.

[0103] As shown in FIG. 9, the size S1 of the first welding portion 4 in the thickness direction of the first main body 11, i.e. in the X direction shown in FIG. 9, satisfies 2*T2≤S1≤T1, S1 is the size of the first welding portion 4 in the thickness direction of the first main body 11, and is the penetration after laser welding of the header 1 and the heat exchange tube 2. After welding of the heat exchange tube 2 and the header 1 at the first wall surface 11a, S1 is within the range, the header 1 and the heat exchange tube 2 are well welded, the strength of the welded portion is high, and the reliability of the connection between the heat exchange tube 2 and the header 1 is improved. When S1 < 2*T2, the penetration after welding of the header 1 and the heat exchange tube 2 is small, which is not enough to form a good welded joint, the strength of the joint is low, and the reliability of heat exchange is affected. The wall thickness T1 of the header 1 of the heat exchanger is generally greater than the wall thickness T2 of the heat exchange tube 2, and the penetration after welding of the header 1 and the heat exchange tube 2 does not exceed the wall thickness T1 of the header 1.

[0104] The size S2 of the first welding portion 11 in the direction perpendicular to the thickness direction of the first main body 11, i.e. in the Y direction shown in FIG. 9, satisfies S2≥2*T2+L3, where L3 is the single-side gap between the outer wall of the heat exchange tube 2 and the first main body 11 in the direction perpendicular to the thickness direction of the first main body. S2 is the size of the first welding portion 4 in the direction perpendicular to the thickness direction of the first main body 11, and is the width of the laser welding after welding of the header 1 and the heat exchange tube 2. After welding of the heat exchange tube 2 and the header 1 at the position close to the first wall surface 11a, the size S2 is within the range, the header 1 and the heat exchange tube 2 are well welded, the strength of the welded portion is high, and the base metal of the header 1 and the heat exchange tube 2 is melted after welding, forming a good welded portion, reducing the risk of leakage at the connection between the header 1 and the heat exchange tube 2, and improving the reliability of the connection between the heat exchange tube 2 and the header 1. When S2 < 2*T2+L3, the width of the welded joint between the header 1 and the heat exchange tube 2 after welding is small, the strength of the welded joint at the connection between the heat exchange tube 2 and the header 1 is low, and there may be a problem of poor welding at the connection, which reduces the reliability of the heat exchanger.

[0105] The size S1 of the first welding portion 4 in the thickness direction of the first main body 11 satisfies 2*T2≤S1≤T1, and the size S2 of the first welding portion 11 in the direction perpendicular to the thickness direction of the first main body 11 satisfies S2≥2*T2+L3, so that the first welding portion 4 formed after welding of the header 1 and the heat exchange tube 2 is well welded in multiple directions, the strength of the welded portion is improved, the reliability of the connection between the heat exchange tube 2 and the header 1 is improved, the risk of leakage of the heat exchanger is reduced, and the reliability of the heat exchanger is improved.

[0106] In some embodiments, the size S1 of the first welding portion 4 in the thickness direction of the first main body 11 is ≥0.5mm, and / or the size of the first welding portion 11 beyond the first wall surface 11a in the thickness direction of the first main body 11 is not more than 0.2mm+0.3T1.

[0107] The first welding portion 4 has a size S1 in the thickness direction of the first main body 11, and S1≥0.5 mm, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, etc. Thus, the connection between the heat exchange tube 2 and the first wall surface 11a of the header 1 forms a good welding joint, the strength of the connection between the heat exchange tube 2 and the header 1 is improved, and the reliability of the connection between the heat exchange tube 2 and the header 1 is improved. When S1 is less than 0.5 mm, the size of the connection between the header 1 and the heat exchange tube 2 after welding is small, the joint strength is low, and the reliability of the heat exchanger is affected.

[0108] In some embodiments, the size of the first welding portion 11 beyond the first wall surface 11a in the thickness direction of the first main body 11 is less than or equal to 0.2 mm+0.3T1, for example, 0.2 mm+0.3T1, 0.2 mm+0.1T1, 0.2 mm, 0 mm, etc. After the heat exchange tube 2 is inserted into the first hole 111, the size L1 of the heat exchange tube 2 protruding from the first hole 111 in the thickness direction X of the first main body 11 is not more than 0.5T1. After the heat exchange tube 2 and the first main body 11 are welded, the first welding portion 4 is formed, the first welding portion 4 has a certain size S1 in the thickness direction of the first main body 11, and the size of the first welding portion 11 beyond the first wall surface 11a after welding is not more than 0.2 mm+0.3T1. Thus, after welding, a good joint is formed at the connection between the heat exchange tube 1 and the first wall surface 11a, the risk of leakage is reduced, the reliability of the heat exchanger is improved, and the appearance of the welded portion is good. When the size of the first welding portion 11 beyond the first wall surface 11a after welding is more than 0.2 mm+0.3T1, the stress of the first welding portion 11 is too large, the strength is reduced, stress cracking may occur during use of the heat exchanger, leakage may occur, and the service life of the heat exchanger is affected.

[0109] In some specific embodiments, the size of the first welding portion 11 beyond the first wall surface 11a in the thickness direction of the first main body 11 is not more than 0.5 mm, for example, 0.45 mm, 0.4 mm, 0.3 mm, 0.2 mm, 0.1 mm, 0 mm, etc. Thus, after welding, a good joint is formed at the connection between the heat exchange tube 1 and the first wall surface 11a, the risk of leakage is reduced, and the reliability of the heat exchanger is improved.

[0110] In some embodiments, the heat exchanger 100 further comprises a third welding portion 6 connecting the first main body 11 and the second main body 12.

[0111] In the present application, the header 1 is welded with the heat exchange pipe 2 at the first wall surface 11a of the first main body 11, and the first wall surface 11a is located on the inner wall of the header 1. The header 1 includes two parts, the first main body 11 and the second main body 12. After the first wall surface 11a of the header 1 is welded with the heat exchange pipe 2, the first main body 11 and the second main body 12 need to be welded to complete the sealing of the header 1. The first main body 11 and the second main body 12 are welded to form a third welding part 6, which connects the first main body 11 and the second main body 12. The position of the third welding part 6 is shown in Figure 10. The first main body 11 and the second main body 12 are connected by welding the welds at the connection, thereby improving the strength of the connection between the first main body 11 and the second main body 12, reducing the risk of leakage at the connection between the first main body 11 and the second main body 12 of the header 1, and improving the reliability of the heat exchanger. The first main body 11 and the second main body 12 can be connected by laser welding, argon arc welding, or other methods, which are not limited here.

[0112] In some embodiments, the heat exchange pipe 2 further includes a protruding part 21 protruding from the surface of the heat exchange pipe 2, and the protruding part 21 is located near the end of the heat exchange pipe 2 in the length direction. At least part of the protruding part 21 abuts against the second wall surface 11b.

[0113] Specifically, as shown in Figure 5, the heat exchange pipe 2 further includes a protruding part 21 protruding from the surface of the heat exchange pipe 2, and the protruding part 21 is located near the end of the heat exchange pipe 2 in the length direction. When the heat exchange pipe 2 is inserted into the header 1, at least part of the protruding part 21 abuts against the second wall surface 11b, thereby positioning the heat exchange pipe 2 inserted into the first main body 11, so that the plurality of heat exchange pipes inserted into the first main body 11 are in the same position, which is more convenient for maintaining the consistency of the insertion position when the plurality of heat exchange pipes 2 are inserted, and is more convenient for subsequent welding of the heat exchange pipe 2 and the first wall surface 11a, and the welding position is more accurate, thereby improving the welding reliability and the reliability of the heat exchanger.

[0114] The protruding part 21 can be provided on the side of the heat exchange pipe 2 in the Y direction, and positioning can be achieved; the protruding part 21 can be an integral structure with the heat exchange pipe 2, or a separate structure, which is not limited here.

[0115] In some embodiments, the heat exchanger 100 further includes fins 3 made of aluminum or aluminum alloy. The fins 3 are located between adjacent heat exchange pipes 2 and are connected to the heat exchange pipes 2 by welding, or the heat exchange pipes 2 are provided in the fins 3 and are connected to the fins 3 by welding.

[0116] The heat exchanger 100 further comprises fins 3 made of pure aluminum or aluminum alloy. Since the thermal conductivity of aluminum is higher than that of stainless steel, the use of fins made of pure aluminum or aluminum alloy can better improve the heat exchange efficiency of the heat exchanger.

[0117] The heat exchanger 100 can be as shown in FIGS. 1-3. The fins 3 are corrugated fins. The fins 3 are located between adjacent heat exchange pipes 2 and connected to the heat exchange pipes 2 by welding. The connection gap between the heat exchange pipes 2 and the fins 3 is reduced, the thermal resistance of the heat exchanger is reduced, and the heat exchange efficiency of the heat exchanger is improved.

[0118] The heat exchanger 100 can also be as shown in FIGS. 11-12. The fins 3 are sheet structures. The heat exchange pipes 2 are arranged in the fins 3. The heat exchange pipes 2 are inserted into the fins 3 from the openings on the side of the fins 3 and connected to the fins 3. The heat exchange pipes 2 and the fins 3 are connected by welding. The connection gap between the heat exchange pipes 2 and the fins 3 is reduced, the thermal resistance of the heat exchanger is reduced, and the heat exchange efficiency of the heat exchanger is improved.

[0119] The heat exchanger 100 can also be as shown in FIG. 13. The fins 3 are sheet structures. The heat exchange pipes 2 are arranged in the fins 3. The heat exchange pipes 2 pass through the fin holes on the fins 3 and are connected to the fins 3. The heat exchange pipes 2 and the fins 3 can be connected by welding. The connection gap between the heat exchange pipes 2 and the fins 3 is reduced, the thermal resistance of the heat exchanger is reduced, and the heat exchange efficiency of the heat exchanger is improved.

[0120] The heat exchanger 100 can be a single-row structure, a double-row structure, or a multi-row structure. As shown in FIG. 2 or FIG. 11, the heat exchanger is a single-row structure. As shown in FIG. 3, the heat exchanger is a three-row structure.

[0121] It should be noted that in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also in the present application, the meaning of "a plurality of" is at least two, unless otherwise specifically defined or limited.

[0122] In the present application, unless otherwise specifically defined or limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0123] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly contacting the first and second features, or indirectly contacting the first and second features through an intermediate medium. Also, the first feature "over", "above" and "on top of" the second feature can be directly above or diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can be directly below or diagonally below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0124] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present application. Exemplary expressions of the above terms do not necessarily refer to the same embodiment or example in this specification, and the particular feature, structure, material, or characteristic can be combined in any suitable manner in one or more embodiments or examples. In addition, a person skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples, without contradiction.

[0125] The above is only some embodiments of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of processing a heat exchanger, characterized in that, The method comprises: a first body of the header, the first body comprising a first wall surface and a second wall surface arranged along a thickness direction of the first body, a first hole being provided in the first body for inserting a heat exchange tube from the second wall surface, the first hole penetrating the first wall surface and the second wall surface, the wall thickness of the first body being defined as T1, and the distance between the heat exchange tube after being inserted into the first hole and the first wall surface being less than or equal to 0.5T1; laser welding the connection between the heat exchange tube and the first wall surface; applying a connecting agent to the connection between the heat exchange tube and the second wall surface to connect the heat exchange tube and the second wall surface.

2. The heat exchanger fabrication method of claim 1, wherein, When laser welding is performed, the laser beam is arranged at a predetermined angle with respect to the first wall surface, and the predetermined angle is in the range of 90°±5°.

3. The heat exchanger fabrication method of claim 1, wherein, The header further comprises a second body, and the first body and the second body are welded.

4. The heat exchanger fabrication method of claim 1, wherein, In the step of inserting the heat exchange tube into the first hole, the first body is fixed, and a plurality of heat exchange tubes are kept at the same position after being inserted into the first hole.

5. The heat exchanger fabrication method of claim 1, wherein After the heat exchange tube is inserted into the first hole, the distance between the end of the heat exchange tube and the first wall surface in the thickness direction of the first body is less than or equal to 0.25T1; and / or, the gap between the outer wall of the heat exchange tube and the first body in the direction perpendicular to the thickness direction of the first body is less than or equal to 0.05 mm.

6. The heat exchanger machining method according to any one of claims 1 to 5, characterized in that, In the step of laser welding, the profile of the connection between the heat exchange tube and the first wall surface is scanned, and laser welding is performed on the connection between the heat exchange tube and the first wall surface after the position to be welded is confirmed.

7. The heat exchanger machining method according to any one of claims 1 to 5, characterized in that, The connecting agent is a paste solder, and the paste solder comprises an aluminum-silicon solder paste, and the connection between the heat exchange tube and the second wall surface is welded.

8. The heat exchanger fabrication method of any one of claims 1-5, wherein, The connecting agent is an adhesive, and the connection between the heat exchange tube and the second wall surface is glued after the fin and the heat exchange tube are welded.

9. The heat exchanger fabrication method of any one of claims 1-5, wherein, The method further comprises: assembling the heat exchange tube and the fin, and welding the fin and the heat exchange tube.

10. A heat exchanger, characterized by The header is made of stainless steel, and has a tube wall, the tube wall comprising at least part of a first body and at least part of a second body, the first body being provided with a first hole penetrating the first body, the first body further comprising a first wall surface and a second wall surface arranged along the thickness direction of the first body, the first wall surface being located in the tube cavity of the header, and the second wall surface being located outside the tube cavity of the header; the heat exchange tube is made of stainless steel, and penetrates the first hole and communicates with the header; the heat exchange tube and the header form a first welding portion at the connection between the heat exchange tube and the first wall surface, and form a second connection portion at the connection between the heat exchange tube and the second wall surface. The first welding portion is formed by laser welding.

11. The heat exchanger of claim 10, wherein The second connection portion is formed by welding or gluing.

12. The heat exchanger of claim 10, wherein, The first welding portion is arranged along the circumferential direction of the heat exchange tube, and / or the second connection portion is arranged along the circumferential direction of the heat exchange tube.

13. The heat exchanger of claim 10, wherein ​ 14. The heat exchanger according to any of claims 10-13, characterized in that A wall thickness of the first main body is defined as T1, a wall thickness of the heat exchange tube is defined as T2, a size S1 of the first welding portion in a thickness direction of the first main body satisfies: 2*T2≤S1≤T1, and / or a size S2 of the first welding portion in a direction perpendicular to the thickness direction of the first main body satisfies: S2≥2*T2+L3, wherein L3 is a gap between an outer wall of the heat exchange tube and the first main body in the direction perpendicular to the thickness direction of the first main body.

15. The heat exchanger according to any of claims 10-13, characterized in that A size S1 of the first welding portion in a thickness direction of the first main body is greater than or equal to 0.5 mm, and / or a wall thickness of the first main body is defined as T1, and a size of the first welding portion exceeding the first wall surface in the thickness direction of the first main body is not more than 0.2 mm+0.3T1.

16. The heat exchanger according to any one of claims 10-13, characterized in that The heat exchange tube further comprises a protruding portion protruding from a surface of the heat exchange tube, the protruding portion is close to an end of the heat exchange tube in a length direction thereof, and at least part of the protruding portion abuts against the second wall surface.

17. The heat exchanger according to any of claims 10-13, characterized in that The heat exchanger further comprises a third welding portion connecting the first main body and the second main body.

18. The heat exchanger according to any one of claims 10-13, characterized in that The heat exchanger further comprises fins, the fins are made of aluminum or aluminum alloy, the fins are located between adjacent heat exchange tubes and are connected to the heat exchange tubes by welding, or the heat exchange tubes are arranged in the fins and are connected to the fins by welding.

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