Heat exchanger machining method and heat exchanger

Abstract

The heat exchanger machining method comprises the steps that a first main body piece of a collecting pipe is taken, the first main body piece comprises a first wall face and a second wall face which are arranged in the thickness direction of the first main body piece, a heat exchange pipe is inserted into a first hole from the second wall face, the first hole is formed in the first main body piece, and the wall thickness of the first main body piece is defined as T1, the distance from the tail end of the heat exchange tube inserted into the first hole to the first wall surface is smaller than or equal to 0.5 T1; laser welding is conducted on the joint of the heat exchange tube and the first wall face; and coating a connecting agent at the joint of the heat exchange tube and the second wall surface, and completing the connection of the joint of the heat exchange tube and the second wall surface through the connecting agent. According to the heat exchanger, laser welding is conducted at the joint of the heat exchange pipe and the first wall face of the collecting pipe, the joint of the heat exchange pipe and the second wall face of the collecting pipe is connected through the connecting agent, the reliability of the joint of the collecting pipe and the heat exchange pipe is improved, and the reliability of the heat exchanger is improved.

Description

Technical Field

[0001] This application relates to the field of heat exchanger technology, and more specifically, to a heat exchanger processing method and a heat exchanger including stainless steel tubes. Background Technology

[0002] Heat exchangers are now widely used in heat exchange systems. In related technologies, to improve the corrosion resistance of heat exchangers, stainless steel can be used for both the heat exchange tubes and the manifold. When welding stainless steel heat exchange tubes to stainless steel manifolds, the heat exchange tubes are inserted into the holes of the manifolds. On the one hand, since both the manifolds and heat exchange tubes are integral tubular structures, welding can only be performed on the outside of the tubes at the connection points. However, welding requires welding around the entire circumference of the tubes at the connection points. When the spacing between the heat exchange tubes is too small or there are multiple rows of heat exchangers, some connections may not be properly welded, resulting in incomplete welds. On the other hand, because the walls of the heat exchange tubes are relatively thin, welding them to the manifolds can easily cause the heat exchange tubes to burn through, leading to leaks in the heat exchanger and affecting the reliability of the weld between the heat exchange tubes and the manifolds, thus impacting the overall reliability of the heat exchanger. Summary of the Invention

[0003] This application provides a heat exchanger processing method that improves the welding reliability of the manifold and heat exchange tubes, reduces the risk of heat exchanger leakage, and improves the reliability of the heat exchanger.

[0004] Another embodiment of this application provides a heat exchanger in which the heat exchange tubes are connected to both sides of the manifold, reducing the risk of leakage and providing high reliability.

[0005] This application provides a heat exchanger processing method, including: taking a first main body component of a manifold, the first main body component including a first wall surface and a second wall surface disposed along the thickness direction of the first main body component; inserting a heat exchange tube into a first hole from the second wall surface, the first hole being disposed in the first main body component and penetrating the first wall surface and the second wall surface; defining the wall thickness of the first main body component as T1; and the distance by which the heat exchange tube extends beyond the first wall surface after being inserted into the first hole is less than or equal to 0.5T1. Laser welding is used to connect the heat exchange tube to the first wall surface; A bonding agent is applied to the joint between the heat exchange tube and the second wall to connect the joint between the heat exchange tube and the second wall.

[0006] This application discloses a heat exchanger processing method. On one hand, a heat exchange tube is inserted into a first hole from the second wall of the first main body of the manifold. Laser welding is performed at the connection between the heat exchange tube and the first wall. The distance from the end of the heat exchange tube after insertion into the first hole beyond the first wall is less than or equal to 0.5T1. The laser welding at the connection between the heat exchange tube and the first wall of the manifold is a planar weld, which is applicable to heat exchangers with multiple rows or small spacing between heat exchange tubes, improving the applicability of the processing method. It also reduces the risk of heat exchange tube burn-through when the welding at the connection between the heat exchange tube and the manifold is a fillet weld, reducing the risk of leakage and improving welding reliability. On the other hand, a bonding agent is used at the connection between the heat exchange tube and the second wall of the manifold to fill the gap at the connection, reducing the risk of corrosion at the connection and further improving the reliability of the connection between the manifold and the heat exchange tube, thus improving the overall reliability of the heat exchanger.

[0007] Another embodiment of this application provides a heat exchanger, comprising: a manifold made of stainless steel, the manifold having a wall, the wall including at least a portion of a first main body and at least a portion of a second main body, the first main body having a first hole penetrating the first main body, the first main body further including a first wall surface and a second wall surface disposed along the thickness direction of the first main body, the first wall surface being located inside the cavity of the manifold, and the second wall surface being located outside the cavity of the manifold; a heat exchange tube made of stainless steel, the end of the heat exchange tube being inserted into the first hole and communicating with the manifold; a first welded portion being formed at the connection between the heat exchange tube and the first wall surface, and a second connecting portion being formed at the connection between the heat exchange tube and the second wall surface.

[0008] The heat exchanger of this application has a manifold and a heat exchange tube made of stainless steel, which improves the corrosion resistance of the heat exchanger. A first welded part is formed at the connection between the heat exchange tube and the first wall of the manifold, which improves the reliability of the connection between the manifold and the heat exchange tube. A second connection part is formed at the connection between the heat exchange tube and the manifold. Connections are made on both sides of the connection between the heat exchange tube and the manifold, which further reduces the risk of leakage at the connection between the heat exchange tube and the manifold and improves the reliability of the heat exchanger. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of a heat exchanger according to an embodiment of this application; Figure 2 This is a partial three-dimensional structural diagram of a heat exchanger according to an embodiment of this application; Figure 3 This is a partial three-dimensional structural diagram of another heat exchanger according to an embodiment of this application; Figure 4 for Figure 3 An enlarged structural diagram at point A; Figure 5 This is a partial cross-sectional view of a heat exchanger during the manufacturing process according to an embodiment of this application. Figure 6 This is a partial cross-sectional view of another heat exchanger according to an embodiment of this application during the manufacturing process; Figure 7 This is a schematic diagram of the structure of the first main component according to an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the second main component according to an embodiment of this application; Figure 9 This is a partial structural diagram of a heat exchanger after welding, according to an embodiment of this application. Figure 10 for Figure 3 Enlarged structural diagram at point B; Figure 11 This is a schematic diagram of the structure of another heat exchanger according to an embodiment of this application; Figure 12 This is a partial structural schematic diagram of another heat exchanger according to an embodiment of this application; Figure 13 This is a partial structural schematic diagram of another heat exchanger according to an embodiment of this application.

[0010] in: Heat exchanger 100, manifold 1, first main body 11, first wall 11a, second wall 11b, first hole 111, second main body 12, pipe wall 13, pipe cavity 14, heat exchange tube 2, protrusion 21, fin 3, first welded part 4, second connecting part 5, third welded part 6, laser beam 7.

[0011] The accompanying drawings, which are incorporated in and form part of this specification, illustrate schematic diagrams consistent with embodiments of this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0012] To better understand the technical solutions of this application, the embodiments of this application are described in detail below with reference to the accompanying drawings. The embodiments described below are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The terminology used in the embodiments of this application is for the purpose of describing specific embodiments only, and is not intended to limit the present application. The singular forms "a," "the," and "the" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0013] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0014] The following description, with reference to the accompanying drawings, illustrates a heat exchanger manufacturing method and a heat exchanger according to an embodiment of the present invention.

[0015] A heat exchanger processing method according to an embodiment of this application includes: taking a first main body 11 of a manifold 1, the first main body 11 including a first wall surface 11a and a second wall surface 11b disposed along the thickness direction of the first main body 11; inserting a heat exchange tube 2 into a first hole 111 from the second wall surface 11b, the first hole 111 being disposed in the first main body 11 and penetrating the first wall surface 11a and the second wall surface 11b; defining the wall thickness of the first main body 11 as T1; and the distance of the heat exchange tube 2 after insertion into the first hole extending beyond 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; applying a bonding agent to the connection between the heat exchange tube 2 and the second wall surface 11b; and connecting the connection between the heat exchange tube 2 and the second wall surface 11b.

[0016] Specifically, when processing the heat exchanger 100, the first main body 11 of the manifold 1 is taken. The first main body 11 includes a first wall surface 11a and a second wall surface 11b arranged along the thickness direction of the first main body 11. The heat exchange tube 2 is inserted into the first hole 111, which is located in the first main body 11. The manifold 1 is made of stainless steel, and the heat exchange tube 2 is also made of stainless steel. There can be multiple heat exchange tubes 2, and there can also be multiple first holes 111. One heat exchange tube 2 is inserted into one first hole 111, and multiple heat exchange tubes 2 are respectively inserted into multiple first holes 111 of the manifold 1. When the heat exchange tube 2 is inserted into the first hole 111, it is inserted from the second wall surface 11b along the thickness direction of the first main body 11, that is, along the direction from the second wall surface 11b to the first wall surface 11a. After the manifold 1 is processed, the second wall surface 11b is located outside the cavity of the manifold 1, and the first wall surface 11a is located inside the cavity of the manifold 1. The thickness direction of the first main body 11 is as follows: Figure 1 The X direction is shown in the diagram.

[0017] In some embodiments, such as Figure 5As shown, after the heat exchange tube 2 is inserted into the first hole 111, the distance L1 by which the end of the heat exchange tube 2 extends beyond 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. Schematically, it can be 0.5T1, 0.4T1, 0.3T1, 0.25T1, 0.2T1, 0.05T1, 0, etc., so that when the heat exchange tube 2 is laser welded at the first wall surface 11a connected to the manifold 1, it is a planar weld. Moreover, it improves the welding reliability at the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 1, reduces the risk of leakage at the connection, and improves the reliability of the heat exchanger. When L1 is greater than 0.5T1, the heat exchange tube 2 extends too far beyond the first wall surface 11a of the manifold 1. During laser welding, it may weld along the circumferential contour of the heat exchange tube 2 or around the first hole 111 of the manifold 1. This cannot guarantee the formation of a good weld joint at the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 1, resulting in poor welding at the connection between the heat exchange tube 2 and the manifold 1. There is a risk of leakage at the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 1, which affects the reliability of the heat exchanger.

[0018] In some specific embodiments, after the heat exchange tube 2 passes through the first hole 111, the distance L1 of the heat exchange tube 2 extending beyond the first wall surface 11a is less than or equal to 1 mm. For example, it can be 1 mm, 0.8 mm, 0.65 mm, 0.5 mm, 0.2 mm, 0.05 mm, 0 mm, etc., so that when the heat exchange tube 2 is welded to the first wall surface 11a at the connection with the manifold 1, it is a planar weld, which improves the welding reliability of the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 1, reduces the risk of leakage at the connection, and improves the reliability of the heat exchanger.

[0019] In related technologies, both heat exchanger tube 2 and manifold 1 are tubular structures. After heat exchanger tube 2 is inserted into manifold 1, welding can only be performed on the outside of manifold 1 or heat exchanger tube 2. During laser welding, there is a certain angle at the connection between heat exchanger tube 2 and manifold 1, and the connection between heat exchanger tube 2 and manifold 1 can only be a fillet weld. However, during welding, the circumference of the tube at the connection between manifold 1 and heat exchanger tube 2 needs to be welded. When the heat exchanger has a two- or multiple-row structure, heat exchanger tube 2 has two or more rows. The spacing between adjacent rows of heat exchanger tubes is too small, or it is a single row. If the spacing between adjacent heat exchange tubes 2 along the length of the manifold 1 in the heat exchanger is too small, the welding head at some joints may not be able to be inserted or the laser beam may not be able to be aligned with the joint, resulting in incomplete welding and a risk of leakage at the joint. On the other hand, in order to improve heat exchange efficiency, the heat exchange tubes 2 are small in size and thin in wall thickness. Laser welding is a fusion welding method, and there is a risk of burning through the thin-walled heat exchange tubes 2 during welding, which also leads to a risk of leakage at the joint.

[0020] In this application, the heat exchange tube 2 is inserted into the first hole 111 of the manifold 1 from the second wall surface 11b. Laser welding is performed at the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 1, and the distance of the heat exchange tube 2 beyond the first hole 111 is less than or equal to 0.5T1. The connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 1 is a planar weld, which can solve the problems of non-welding or low welding reliability of multi-row heat exchangers or heat exchangers with small heat exchange tube spacing. In the case of multi-row heat exchangers, the welding of multiple rows of heat exchange tubes 2 and manifold 1 can be achieved by planar welding. It can also be used to achieve heat exchangers with small spacing between adjacent heat exchange tubes in single-row or multi-row heat exchangers by planar welding, avoiding the problem of incomplete welding due to small spacing between adjacent heat exchange tubes, thus improving the applicability of this processing method. Moreover, the connection between heat exchange tube 2 and the first wall surface 11a of manifold 1 is planar welded, which can also be used when the wall thickness of heat exchange tube 2 is thin, reducing the risk of heat exchange tube 2 burning through and the risk of leakage, improving the welding reliability of the connection between heat exchange tube 2 and manifold 1, thereby improving the reliability of the heat exchanger.

[0021] After the heat exchanger tube 2 is inserted into the manifold 1, laser welding is performed at the connection point of the first wall surface 11a of the heat exchanger tube 2 and the manifold 1 to achieve a welded connection. Laser welding of the stainless steel heat exchanger tube 2 and the manifold 1 results in a smaller heat-affected zone, preventing interference with adjacent weld points. Furthermore, it offers higher welding precision, faster welding speed, and higher welding reliability, thus improving the reliability of the heat exchanger. Optionally, laser welding can be performed at the first wall surface 11a of the heat exchanger tube 2 and the manifold 1 using a laser galvanometer, resulting in even higher welding precision and improved welding reliability. Of course, other methods can also be used for laser welding; no limitation is made here.

[0022] A bonding agent is applied to the connection between the heat exchange tube 2 and the second wall surface 11b to connect them. The bonding agent completes the sealed connection at the junction of the heat exchange tube 2 and the second wall surface 11b. The heat exchange tube 2 is inserted into the manifold 1 from the second wall surface 11b along the thickness direction of the first main body. After insertion, the end of the heat exchange tube 2 is located inside the manifold 1. The heat exchange tube 2 and the manifold 1 are welded at the first wall surface 11a, achieving a welded connection. However, the other side of the connection between the heat exchange tube 2 and the manifold 1, i.e., the connection between the heat exchange tube 2 and the second wall surface 11b, is located outside the manifold 1. This connection may have a certain gap. Since the heat exchanger is exposed to air during use, the gases and moisture in the air create a corrosive environment within this gap, potentially causing corrosion and leading to heat exchanger leakage. Therefore, a bonding agent is applied to the connection between the heat exchange tube 2 and the second wall 11b. The bonding agent completes the sealed connection between the heat exchange tube 2 and the second wall 11b, fills the gap at the connection between the heat exchange tube 2 and the second wall 11b, reduces the risk of gap corrosion at the connection, and further improves the reliability of the connection between the heat exchange tube 2 and the manifold 1, thereby improving the reliability of the heat exchanger 100.

[0023] The heat exchanger processing method of this application involves laser welding at the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 1. The distance by which the end of the heat exchange tube 2, after being inserted into the first hole 111, extends beyond the first wall surface is less than or equal to 0.5T1. The laser welding at the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 2 is a planar weld, which improves the applicability of the processing method and reduces the risk of burn-through of the heat exchange tube when using fillet welds on the outside of the tube, thus reducing the risk of heat exchanger leakage. Furthermore, a sealing agent is used at the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 2 to fill the gap at the connection, reducing the risk of corrosion at the connection and further improving the reliability of the connection between the manifold 1 and the heat exchange tube 2, thereby enhancing the reliability of the heat exchanger.

[0024] In some embodiments, during laser welding, the laser beam is at a predetermined angle to the first wall surface 11a, and the predetermined angle ranges from 90°±5°.

[0025] Specifically, such as Figure 4The 7 shown represents the incident angle of the laser beam. During laser welding, the laser beam 7 is aimed at the connection point of the heat exchange tube 2 and the first wall surface 11a of the manifold 1. During the welding process, the laser beam moves along the connection point of the heat exchange tube 2 and the first wall surface 11a of the manifold 1, completing the welding connection around the tubes at the connection points of multiple heat exchange tubes 2 and the first wall surface 11a of the manifold 1. The laser beam 7 is at a predetermined angle to the surface to be welded. In this embodiment, the laser beam 7 is at a predetermined angle to the first wall surface 11a, and the predetermined angle ranges from 90° to 5°. The laser beam is set approximately perpendicular to the part to be welded. In this way, during laser welding, the laser beam 7 can be more evenly directed at the connection point to be welded, so as to better weld the connection point of the heat exchange tube 2 and the first wall surface 11a. This reduces the risk of uneven welding caused by tilted welding angle or welding position displacement caused by tilted welding angle, which affects the welding reliability of the connection point. This reduces the risk of heat exchange tube 2 being burned through during welding of manifold 1 and heat exchange tube 2, lowers the risk of leakage, and improves welding reliability.

[0026] Optionally, during laser welding, the length direction of the heat exchange tube 2 is placed vertically, as shown in the figure below. Figure 1 The X direction shown is consistent with the thickness direction of the first main body 11. At least part of the manifold 1 to be welded is located above the heat exchange tube 2 in the vertical direction. That is, at least part of the manifold 1 to be welded is higher than the heat exchange tube 2 in the vertical direction. This makes it easier for the molten base material to spread or flow more evenly along the circumference of the connection between the heat exchange tube 2 and the manifold 1 during laser welding. This forms a reliable weld at the connection between the heat exchange tube 2 and the manifold 1, improves the welding effect at the connection between the heat exchange tube 2 and the manifold 1, increases the strength of the welded joint, and further improves the reliability of the weld.

[0027] In some embodiments, the manifold 1 further includes a second body component 12, and the first body component 11 and the second body component 12 are welded together to complete the welding of the manifold 1.

[0028] like Figure 1-4 , Figure 7-8 As shown, the manifold 1 includes a first main component 11 and a second main component 12. The pipe wall 13 of the manifold 1 includes at least a portion of the first main component 11 and at least a portion of the second main component 12. The at least a portion of the first main component 11 and at least a portion of the second main component 12 enclose to form a cavity 14 of the manifold 1. The first main component 11 and the second main component 12 are welded together to complete the sealed connection of the manifold 1.

[0029] When the heat exchanger is in operation, water, refrigerant and other heat exchange media flow through the manifold 1. The first main component 11 and the second main component 12 are sealed together by welding, which can improve the reliability of the connection, increase the strength of the manifold, reduce the risk of leakage at the connection between the first main component 11 and the second main component 12, and improve the reliability of the heat exchanger.

[0030] It is understood that after laser welding of the heat exchange tube 2 inserted into the manifold on the first wall surface 11a side of the first main body 11, the first main body 11 and the second main body 12 can be welded to complete the welding seal of the manifold 1; alternatively, after welding the heat exchange tube 2 and the first wall surface 11a, the heat exchange tube 1 can be installed or welded with other components before welding the first main body 11 and the second main body 12 of the manifold 1. No limitation is imposed here.

[0031] Optionally, when welding 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 weld seams of the first main body 11 and the second main body 12 can be spot welded in advance to fix the position of the first main body 11 and the second main body 12. Then the first main body 11 and the second main body 12 are welded to complete the welding and sealing of the manifold 1 and improve the reliability of processing.

[0032] Optionally, the weld at the connection between the first main body 11 and the second main body 12 can be welded by laser welding to complete the welding and sealing of the manifold 1. Of course, it is understood that the first main body 11 and the second main body 12 can also be welded by argon arc welding, or by other means, which are not limited here.

[0033] In some embodiments, during the step of inserting a plurality of heat exchange tubes 2 into the first hole 111, the first main body 11 is fixed, and the plurality of heat exchange tubes 2 remain in the same position after being inserted into the first hole 111.

[0034] Specifically, the heat exchanger includes multiple heat exchange tubes 2, and the manifold 1 has multiple first holes 111 for inserting the heat exchange tubes 2 into the first holes 111 and communicating with the manifold 1. In the step of inserting the multiple heat exchange tubes 2 into the first holes 111, to facilitate subsequent welding of the heat exchange tubes 2 to the first wall surface 11a and improve welding quality, and to control the distance from the ends of the multiple heat exchange tubes 2 inserted into the first holes 111 to the first wall surface 11a to be the same (i.e., to ensure that the ends of the multiple heat exchange tubes 2 inserted into the first holes 111 are on the same plane), when the heat exchange tubes 2 are inserted into the first holes 111 from the side near the second wall surface 11b, a first main body component 11 can be fixed near the first wall surface 11a to limit the position of the heat exchange tubes 2 after insertion into the first holes 111. This ensures that the multiple heat exchange tubes 2 remain in the same position after insertion into the first holes 111, improving processing consistency, enhancing the welding quality and processing efficiency at the connection between the heat exchange tubes 2 and the first wall surface 11a, and improving the reliability of the heat exchanger processing.

[0035] In some embodiments, when processing the heat exchanger, the heat exchanger can be as follows: Figure 1 and Figure 2 As shown, the heat exchanger has a single-row structure, with multiple heat exchange tubes 2 arranged at intervals along the length of the manifold 1, as shown in the figure. Figure 1 As shown in the Z direction; the heat exchanger can also be like Figure 3 As shown, the heat exchanger has a two- or multiple-row structure, and the heat exchange tubes 2 also have a two- or multiple-row structure. Multiple heat exchange tubes 2 need to be welded to the manifold 1. During the process of inserting multiple heat exchange tubes 2 into the first hole 111 of the manifold 1, by fixing the first main body 11, the multiple heat exchange tubes 2 remain in the same position after being inserted into the first hole 111, improving the consistency of processing, facilitating more accurate subsequent welding positions, improving the welding quality at the connection between the heat exchange tubes 2 and the first wall surface 11a, and improving the reliability of the heat exchanger processing and the overall reliability of the heat exchanger.

[0036] Optionally, the first main body 11 can be fixed by placing a tooling near the first wall 11a to limit the heat exchange tube 2 after it is inserted into the first hole 111. Alternatively, the limiting structure on the processing device, the positioning protrusion on the heat exchange tube 2, or other methods can be used to limit the heat exchange tube 2. No limitation is made here.

[0037] In some embodiments, after the heat exchange tube 2 is inserted into the first hole 111, the distance between the end of the heat exchange tube 2 and the first wall surface 11a in the thickness direction of the first body is less than or equal to 0.25T1.

[0038] Specifically, such as Figure 6As shown, after the heat exchange tube 2 is inserted into the first hole 111, the distance L2 between the end of the heat exchange tube 2 and the first wall surface 11a along 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 tube 2 and the first wall surface 11a is less than or equal to 0.25T1. For example, it can be 0.25T1, 0.2T1, 0.16T1, 0mm, etc., so that the connection between the heat exchange tube 2 and the first wall surface 11a is basically a planar weld, which improves the welding reliability and reduces the risk of leakage at the connection. When the heat exchange tube 2 does not completely pass through the first hole 111 and does not exceed the first wall surface 11a by a distance L2 greater than 0.25T1, during the welding of the heat exchange tube 2 and the first wall surface 11a of the manifold 1, the molten base material of the manifold 1 cannot be fully spread to the connection between the manifold 1 and the heat exchange tube 2. This may cause poor welding problems such as incomplete welding, missing welding, and penetration at the connection between the heat exchange tube 2 and the first wall surface 11a. Poor welding at the connection between the heat exchange tube 2 and the manifold 1 may cause leakage in the heat exchanger, thereby reducing the pass rate of heat exchanger processing and reducing processing reliability.

[0039] In some specific 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 that does not exceed the first hole 111 to the first wall surface 11a along the thickness direction X of the first main body 11 is less than or equal to 0.5mm. For example, it can be 0.5mm, 0.4mm, 0.3mm, 0.15mm, 0mm, etc., to improve welding reliability.

[0040] In some embodiments, such as Figure 5 and Figure 6 As shown, after the heat exchange tube 2 is inserted into the first hole 111, along the thickness direction of the first main body 11, the distance L1 from the end of the heat exchange tube 2 beyond the first wall surface 11a is less than or equal to 0.5T1, and the distance L2 from the end of the heat exchange tube 2 not beyond 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, taking the excess part as a positive value, the distance from the end of the heat exchange tube to the first wall surface 11a is between -0.25T1 and 0.5T1. Within this range, the connection between the heat exchange tube 2 and the first wall surface 11a is generally a planar weld, which can better achieve the welding, reduce the problem of poor weld at the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold, improve the welding reliability, reduce the risk of leakage at the connection, and improve the reliability of the heat exchanger.

[0041] 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 member is less than or equal to 0.05 mm in the thickness direction perpendicular to the first body member 11.

[0042] Specifically, such as Figure 5As shown, after the heat exchange tube 2 is inserted into the first hole 111, in the thickness direction perpendicular to the first main body 11 (as shown in the Y direction), the single-sided gap L3 between the outer wall of the heat exchange tube 2 and the first main body 11 is less than or equal to 0.05 mm. On one hand, a certain gap makes insertion easier when the outer wall of the heat exchange tube 1 is inserted into the first hole 111, and a certain welded part is formed within this gap after welding, improving welding reliability. On the other hand, controlling this dimension L3 to be less than or equal to 0.05 mm reduces welding defects such as incomplete welding caused by excessive gaps when welding the heat exchange tube 1 and the first main body 11, improving the welding reliability of the heat exchange tube 1 and the first main body 11, reducing the risk of leakage, and improving the reliability of the connection between the heat exchange tube 2 and the manifold 1.

[0043] In some embodiments, during the laser welding step, the outline of the connection between the heat exchange tube 2 and the first wall surface 11a is scanned, and after confirming the position to be welded, the connection between the heat exchange tube 2 and the first wall surface 11a is laser welded.

[0044] Specifically, since multiple heat exchange tubes 2 are welded to the manifold 1, there are multiple welding points during laser welding. Welding occurs at the connection point between each heat exchange tube 2 and the first wall surface 11a of the manifold 1 in the circumference. If the heat exchange tube 2 or manifold 1 is tilted or offset during assembly, the offset position may lead to incomplete or missed welds when welding the connection point, affecting welding reliability. Optionally, during laser welding, a vision inspection device can be used. The vision inspection device is connected to the welding equipment, scans the outline of the connection point between the heat exchange tube 2 and the first wall surface 11a, compares it with a pre-stored welding outline, confirms the welding position, and then performs laser welding on the connection point. If the welding position is correct, welding proceeds normally; if the position is offset or exceeds the set value, welding stops and a warning is issued, and welding resumes after readjustment. This improves the positional accuracy during laser welding, enhances the consistency of welding between the heat exchange tube 2 and the manifold 1, ensures welding quality, and improves welding efficiency and reliability.

[0045] In some embodiments, the bonding agent is a paste solder, including aluminum-silicon solder paste, which is used to weld the heat exchange tube 2 and the second wall 11b together.

[0046] Specifically, the bonding agent can be a paste solder, which is convenient to apply to the connection between the heat exchange tube 2 and the second wall surface 11b. During the fabrication of the heat exchanger 100, the heat exchanger 100 is in a horizontal position. At this time, the length directions of both the manifold 1 and the heat exchange tube 2 are parallel to the horizontal plane. When the paste solder is applied to the connection between the heat exchange tube 2 and the second wall surface 11b, the paste solder flows downwards along the heat exchange tube 2. Due to capillary action, the solder adheres to the circumferential area of ​​the connection between the heat exchange tube 2 and the manifold 1, ensuring that there is solder in the circumferential direction of the connection between the manifold 1 and the heat exchange tube 2. During high-temperature welding, the solder melts and spreads, and after cooling and solidifying, it welds the gap at the connection between the heat exchange tube 2 and the second wall surface 11b, thus achieving a sealed connection at the connection between the heat exchange tube 2 and the second wall surface 11b, reducing the probability of crevice corrosion, and improving the service life and reliability of the heat exchanger.

[0047] The paste-like solder includes aluminum-silicon solder paste, which is used to braze the connection between the second wall surface 11b of the heat exchange tube 2 and the manifold 1. During brazing, the filler metal diffuses with the base material of the stainless steel heat exchange tube 2 and the stainless steel manifold 1, forming a brazing transition zone with aluminum-silicon-iron as the main elements on the surface of the heat exchange tube 2 and / or the manifold 1. This increases the welding strength, improves the welding reliability, and enhances the reliability of the heat exchanger.

[0048] When the bonding agent is a paste solder, the paste solder can be applied to the connection between the second wall surface 11b of the heat exchange tube 2 and the manifold 1 before welding the heat exchange tube 2 and the fin 3. Then, during the furnace brazing process of the heat exchange tube 2 and the fin 3, the connection between the second wall surface 11b of the heat exchange tube 2 and the manifold 1 is simultaneously brazed, thereby reducing the processing steps and improving the processing efficiency of the heat exchanger.

[0049] When applying the paste solder, the amount of solder to be used can be calculated based on the weld gap size at the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1. Then, the solder is evenly applied to both sides of the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1. Utilizing the fluidity of the paste solder itself, the solder flows to both sides of the heat exchange tube 2, filling the gap at the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1. This reduces the risk of crevice corrosion at the connection and improves the reliability of the heat exchanger manufacturing.

[0050] Optionally, the paste solder includes brazing filler metal, flux, and binder. The paste solder has at least one of the following characteristics: brazing filler metal accounts for 45-65% of the paste solder; flux accounts for 15-30% of the paste solder; and binder accounts for 5-40% of the paste solder. Specifically, the brazing filler metal, accounting for 45-65% of the paste solder, is used for brazing; during high-temperature welding, the brazing filler metal melts and fills the gap. The flux, accounting for 15-30% of the paste solder, is used to break down the oxide film on the surface of the heat exchanger tube 2 or manifold 1 to achieve welding. The binder, accounting for 5-40% of the paste solder, facilitates the adhesion and fixation of the paste solder, making it easier for the paste solder to adhere within a certain concentration range. Using this paste solder makes it easier to process the heat exchanger, allowing the paste solder to be uniformly coated at the connection between the second wall surface 11b of the heat exchanger tube 2 and the manifold 1, thereby improving the welding reliability of the connection.

[0051] Alternatively, the paste solder can be applied manually or by an automatic coating machine, or by other methods, without limitation.

[0052] In some embodiments, the connector is an adhesive. After the heat exchange tube 2 and the fins 3 are welded, the heat exchange tube 2 and the second wall surface 11b are bonded together with adhesive.

[0053] Specifically, the connector can be an adhesive. After welding the heat exchange tube 2 and the fins 3, adhesive is applied to the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1. The adhesive flows and fills the gap between the heat exchange tube 2 and the second wall surface 11b of the manifold 1 and around the gap. After curing, a protective adhesive layer is formed at the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1, achieving a sealed connection and filling the gap at the connection. This reduces the risk of gap corrosion at the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1, improving the reliability of the heat exchanger. Using adhesive to connect the gap makes processing easier.

[0054] Alternatively, the adhesive may be epoxy resin or other adhesives, without limitation.

[0055] When applying the adhesive, the amount of adhesive used can be calculated based on the gap size at the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1. Then, the adhesive is evenly applied around the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1. Utilizing the fluidity of the adhesive, it flows into the gap between the heat exchange tube 2 and the manifold 1 and around the gap, filling the gap at the connection between the second wall surface 11b of the heat exchange tube 2 and the manifold 1. This reduces the risk of gap corrosion at the connection and improves the reliability of the heat exchanger manufacturing.

[0056] Alternatively, the binder can be applied manually or by an automatic coating machine, or by other methods, without limitation.

[0057] In some embodiments, the heat exchange tube 2 and fins 3 are assembled, and the fins 3 and heat exchange tube 2 are welded together.

[0058] Assembling the heat exchange tubes 2 and fins 3 includes installing fins 3 between adjacent heat exchange tubes 2, or passing the heat exchange tubes 2 through the fins 3, and then welding the fins 3 and heat exchange tubes 2 to increase the heat exchange effect of the heat exchanger.

[0059] The assembly of heat exchange tube 2 and fins 3 can take place before heat exchange tube 2 is inserted into the first main body 11, after heat exchange tube 2 is inserted into the first main body 11, before welding the first main body 11 and the second main body 12, or after welding the first main body 11 and the second main body 12. There is no limitation on the assembly steps.

[0060] Specifically, in some embodiments, during processing such as Figures 1-3 When assembling the heat exchanger, after the heat exchange tube 2 is inserted into the first main body component 11, fins 3 can be installed between adjacent heat exchange tubes 2. The assembled heat exchange tubes 2 and fins 3 are then bundled together. Next, the first wall surface 11a of the first main body component 11 of the heat exchange tube 2 and the manifold 1 are welded together. Then, the first main body component 11 and the second main body component 12 of the manifold 1 are welded together. Finally, the heat exchange tubes 2 and fins 3 are reflowed for welding to complete the heat exchanger welding. Alternatively, after the heat exchange tube 2 is inserted into the first main body component 11, the heat exchange tubes 2 and the first main body component 11 can be welded together first, and then the fins 3 can be installed between adjacent heat exchange tubes 2, and the fins 3 and the heat exchange tubes 2 can be welded together.

[0061] In some embodiments, during processing such as Figure 11-12 When assembling the heat exchanger shown, the heat exchange tube 2 and the first main body 11 can be welded first, followed by welding the first main body 11 and the second main body 12 of the manifold 1. After welding the heat exchange tube 2 and the manifold 1, the heat exchange tube 2 is pressed into the through slots of the multiple fins 3 from the side. After assembling the heat exchange tube 2 and the fins 3, the heat exchange tube 2 and the fins 3 are welded together. Alternatively, the heat exchange tube 2 and the fins 3 can be assembled first, then the heat exchange tube 2 is inserted into the first main body 11, and the heat exchange tube 2 and the first main body 11 are welded together. Then the first main body 11 and the second main body 12 of the manifold 1 are welded together, and finally the heat exchange tube 2 and the fins 3 are reflow welded together.

[0062] In some embodiments, during processing such as Figure 13When installing the heat exchanger shown, the heat exchange tube 2 can be inserted into the fin holes of multiple fins 3 first, and then both ends of the heat exchange tube 2 can be inserted into the first hole 111 of the manifold 1. The heat exchange tube 2 and the first main body 11 can be welded together, and then the first main body 11 and the second main body 12 of the manifold 1 can be welded together. Finally, the heat exchange tube 2 and the fins 3 can be welded together.

[0063] Optionally, the heat exchange tube 2 and the fins 3 can be connected by brazing. Before brazing the heat exchange tube 2 and the fins 3, a paste-like solder is applied to the connection between the heat exchange tube 2 and the second wall surface 11b. Then, the heat exchange tube 2 and the fins 3 are brazed. During brazing, the welding connection between the heat exchange tube 2 and the fins 3, as well as the welding at the connection between the heat exchange tube 2 and the second wall surface 11b, are completed simultaneously to obtain the heat exchanger product.

[0064] In some embodiments, after the welding of the heat exchange tube 2 and the first wall surface 11a and the welding of the heat exchange tube 2 and the fins 3 are completed, an adhesive is applied to the connection between the heat exchange tube 2 and the second wall surface 11b. After the adhesive is cured, the connection between the heat exchange tube 2 and the second wall surface 11b is completed, thereby improving the reliability of the heat exchanger.

[0065] This invention also provides a heat exchanger 100, which can be formed by the heat exchanger processing method described above. The heat exchanger 100 includes: a manifold 1, made of stainless steel, having a wall 13, the wall 13 including at least a portion of a first main body 11 and at least a portion of a second main body 12; the first main body 11 having a first hole 111 penetrating through it; the first main body 11 also including a first wall surface 11a and a second wall surface 11b disposed along the thickness direction of the first main body 11, the first wall surface 11a located within the cavity 14 of the manifold 1, and the second wall surface 11b located outside the cavity 14 of the manifold 1; a heat exchange tube 2, made of stainless steel, passing through the first hole 111 and communicating with the manifold 1; a first welded portion 4 formed at the connection between the heat exchange tube 2 and the first wall surface 11a, and a second connecting portion 5 formed at the connection between the heat exchange tube 2 and the second wall surface 11b.

[0066] like Figure 1-13 As shown, the heat exchanger 100 includes a manifold 1 and heat exchange tubes 2. Both the manifold 1 and heat exchange tubes 2 are made of stainless steel. This heat exchanger 100 can be used in refrigeration, heating, ventilation, and air conditioning (HVAC) systems, water tank heat exchangers, and other fields. When in use, refrigerant or water, or other heat exchange media, flow through the manifold 1 and heat exchange tubes 2. If a leak occurs in the manifold 1, the heat exchange tubes 2, or the connection between the manifold 1 and the heat exchange tubes 2, the heat exchanger will leak, affecting its reliability and service life. The use of stainless steel for the manifold 1 and heat exchange tubes 2 improves the corrosion resistance of the heat exchanger and extends its service life.

[0067] The pipe wall 13 of the manifold 1 includes at least a portion of a first main body 11 and at least a portion of a second main body 12, which together form a cavity 14 of the manifold 1. The first main body 11 has a first hole 111 for easy insertion of the heat exchange tube 2. There can be multiple first holes 111. The first main body 11 includes a first wall surface 11a and a second wall surface 11b disposed opposite each other along the thickness direction of the first main body 11. The first wall surface 11a is located inside the cavity 14, and the second wall surface 11b is located outside the cavity 14. When the heat exchange tube 2 is inserted into the manifold 1 through the first hole 111, it passes through the first hole 111 of the manifold 1 in the direction from the second wall surface 11b to the first wall surface 11a. After the heat exchange tube 2 passes through the first hole 111, it communicates with the manifold 1.

[0068] A first welded portion 4 is formed at the connection between the heat exchanger tube 2 and the manifold 1 on the first wall surface 11a, and a second connecting portion 5 is formed at the connection between the heat exchanger tube 2 and the manifold 1 on the second wall surface 11b. In related technologies, since both the heat exchanger tube 2 and the manifold 1 are tubular structures, after the heat exchanger tube 2 is inserted into the manifold 1, the connection between the heat exchanger tube 2 and the manifold 1 can only be welded on the outside of the manifold 1. When welding on the outside of the tube, since there are multiple heat exchanger tubes, some positions may be obstructed, and the connection is a fillet weld, which may cause poor welding, posing a risk of leakage and affecting the reliability of the heat exchanger 100.

[0069] In this application, the heat exchange tube 2 is inserted into the first hole 111 of the manifold 1. The first wall surface 11a and the second wall surface 11b connecting the heat exchange tube 2 and the manifold 1 are both connected. A first welded part 4 is formed at the connection between the heat exchange tube 2 and the manifold 1 at the first wall surface 11a. The welded connection between the heat exchange tube 2 and the manifold 1 at the first wall surface 11a improves the reliability of the connection between the heat exchange tube 2 and the manifold 1 at the first wall surface 11a. Furthermore, a second connecting part 5 is formed at the connection between the heat exchange tube 2 and the manifold 1 at the second wall surface 11b. The connection is made on both sides of the connection between the heat exchange tube 2 and the manifold 1, reducing the risk of corrosion at the connection between the heat exchange tube 2 and the manifold 1 at the second wall surface 11b, further improving the reliability of the connection between the heat exchange tube 2 and the manifold 1, and improving the reliability of the heat exchanger 100.

[0070] Understandably, the structure of the first main component 11 can be as follows: Figure 7 As shown, the portion near the first hole 111 has a straight structure, facilitating planar welding with the heat exchange tube 2 inserted into the first hole 111; the structure of the second main body 12 can be as follows: Figure 8As shown, the structure can be straight, curved, or other shapes; no limitation is made here. For example, if the second main body 12 is curved, the resulting manifold 1 can be generally D-shaped. The first main body 11 and the second main body 12 cooperate to form a tubular manifold 2; no limitation is made on the specific structure of the manifold 2 formed by the cooperation of the first main body 11 and the second main body 12. The first main body 11 and / or the second main body 12 may also have openings to connect inlet and outlet pipes, facilitating the flow of heat exchange medium. The heat exchange tube 2 can be flat or elliptical as shown in the figure, or it can be a circular heat exchange tube, or other shapes; no limitation is made here.

[0071] A heat exchanger 100 according to an embodiment of this application forms a first welded part 4 at the connection between the heat exchange tube 2 and the manifold 1 on the first wall surface 11a, thereby improving the reliability of the connection between the heat exchange tube 2 and the manifold 1 at the first wall surface 11a. Furthermore, a second connecting part 5 is formed at the connection between the heat exchange tube 2 and the manifold 1 on the second wall surface 11b, with connections on both sides of the connection between the heat exchange tube 2 and the manifold 1. This improves the reliability of the connection between the manifold 1 and the heat exchange tube 2 and reduces the risk of corrosion at the connection between the heat exchange tube 2 and the manifold 1 on the second wall surface 11b, thus improving the reliability of the heat exchanger 100.

[0072] In some embodiments, the first weld portion 4 is formed by laser welding.

[0073] Specifically, such as Figure 9 As shown, the first weld 4 is formed by welding at the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 1. The heat exchange tube 2 is inserted into the first hole 111 of the manifold 1, and laser welding is performed on the connection between the stainless steel heat exchange tube 2 and the first wall surface 11a of the stainless steel manifold 1. Since the first wall surface 11a is located inside the manifold 1, the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 2 is a planar weld, reducing the risk of the heat exchange tube burning through when welded on the outside of the tube using a fillet weld. In addition, the heat-affected zone of laser welding is smaller, which will not affect adjacent weld points. Moreover, the welding precision is higher, the welding speed is faster, and the welding reliability is higher. The first weld 4 formed by laser welding has a certain depth of penetration, resulting in high reliability of the connection between the heat exchange tube 2 and the manifold 1, high pressure resistance, and improved reliability of the heat exchanger.

[0074] In some embodiments, the first welded portion 4 extends circumferentially along the heat exchange tube 2.

[0075] A first welded part 4 is formed at the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 1. The first welded part 4 is located at the connection between the heat exchange tube 2 and the first wall surface 11a of the manifold 1, that is, along the circumference of the heat exchange tube 2. For example, the first welded part 4 is formed at the connection between the circumference of the heat exchange tube 2 and the first wall surface 11a. Figure 4 As shown, the connection between the heat exchange tube 2 and the first wall surface 11a extends circumferentially along the heat exchange tube 2. After laser welding the connection between the heat exchange tube 2 and the first wall surface 11a, as shown... Figure 9 As shown, a first welded part 4 is formed at the connection between the heat exchange tube 2 and the first wall surface 11a in the circumferential direction. The first welded part 4 extends along the circumferential direction of the heat exchange tube 2. Multiple first welded parts 4 are formed at the connection between multiple heat exchange tubes 2 and the first wall surface 11a. This makes it possible to form a good welded joint between the heat exchange tube 2 and the first main body 11 at the connection, ensuring the sealing at the connection between the heat exchange tube 2 and the manifold 1, reducing the risk of leakage at the connection between the heat exchange tube 2 and the first wall surface 11a, improving the strength and reliability of the connection between the heat exchange tube 2 and the manifold 1, and improving the reliability of the heat exchanger.

[0076] In some embodiments, the second connecting portion 5 is formed by welding, or the second connecting portion 5 is formed by adhesive bonding.

[0077] In some embodiments, such as Figure 9 As shown, the second connection part 5 is formed by welding. A paste-like solder is applied to the connection between the heat exchange tube 2 and the second wall surface 11b. The paste-like solder can be an aluminum-silicon solder. After welding, the second connection part 5 includes a transition zone with aluminum-silicon-iron as the main element. The second connection part 5 is a brazing bevel formed at the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1. A transition zone with aluminum-silicon-iron as the main element is formed on the surfaces of the heat exchange tube 2 and the manifold 1, achieving good welding. Of course, the second connection part 5 may also include an aluminum-silicon compound. The aluminum-silicon compound can be located between the aluminum-silicon-iron transition zone on the surface of the heat exchange tube 2 and the aluminum-silicon-iron transition zone on the surface of the manifold 1. Since the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1 is located on the outside of the manifold 1, it is exposed to the air during heat exchanger application. Gases and moisture in the air create a corrosive environment in the gap. By welding the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1, the aluminum and silicon in the brazing filler metal and the stainless steel heat exchange tube 2 base material dissolve and diffuse with each other, forming a brazing transition zone with aluminum, silicon and iron as the main elements on the surface of the stainless steel base material. This fills the gap at the connection between the heat exchange tube 2 and the second wall surface 11b, reducing the risk of gap corrosion at the connection, increasing the welding strength and welding reliability, reducing the risk of leakage, and improving the reliability of the heat exchanger 100.

[0078] In some embodiments, the second connection portion 5 is formed by brazing after coating with a paste solder. The paste solder includes a brazing filler metal, a flux, and a binder. 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 binder accounts for 5-40% of the paste solder.

[0079] Specifically, the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1 is brazed to form a second connection part 5. In order to achieve the brazing connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1, a paste solder needs to be applied to the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1 for brazing. The main components of the paste solder include brazing filler metal, flux and adhesive.

[0080] The solder comprises 45-65% of the paste solder, which is used for brazing. During high-temperature welding, the solder melts and fills the gap. The flux comprises 15-30% of the paste solder, which is used to break the oxide film on the surface of the heat exchange tube 2 or the manifold 1 to achieve welding. The adhesive comprises 5-40% of the paste solder, which facilitates the adhesion and fixation of the paste solder, making it easier for the paste solder to adhere within a certain concentration range.

[0081] In some embodiments, such as Figure 9 As shown, the second connection 5 is formed by adhesive bonding. That is, the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1 is formed by adhesive bonding. Adhesive is applied to the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1. The adhesive flows and fills the gap between the heat exchange tube 2 and the second wall surface 11b of the manifold 1 and around the gap. After the adhesive cures, a protective adhesive layer is formed on the surface of the heat exchange tube 2 and the manifold 1, achieving the connection at the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1. This fills the gap at the connection between the heat exchange tube 2 and the second wall surface 11b, reducing the risk of corrosion at this connection and improving the reliability of the heat exchanger. When adhesive is used to achieve a sealed connection at this gap, the heat exchanger is easier to manufacture and has a lower cost.

[0082] In some embodiments, the second connecting portion 5 extends circumferentially along the heat exchange tube 2.

[0083] The second connecting part 5 is located at the connection between the heat exchange tube 2 and the second wall surface 11b of the manifold 1, that is, the second connecting part 5 is formed at the connection between the heat exchange tube 2 and the second wall surface 11b in the circumferential direction, such as... Figure 10 As shown, the connection between the heat exchange tube 2 and the second wall surface 11b extends circumferentially along the heat exchange tube 2. After welding or gluing the connection between the heat exchange tube 2 and the second wall surface 11b, a second connection portion 5 is formed at the connection between the circumferential direction of the heat exchange tube 2 and the second wall surface 11b, as shown. Figure 9 As shown, the second connecting part 5 extends circumferentially along the heat exchange tube 2, and multiple second connecting parts 5 are formed at the connection points of multiple heat exchange tubes 2 and the second wall surface 11b. This allows the heat exchange tube 2 and the manifold 1 to form a good connection area at the connection point, ensuring the sealing of the connection point between the heat exchange tube 2 and the manifold 1, reducing the risk of corrosion leakage at the connection point between the heat exchange tube 2 and the second wall surface 11b, and improving the strength and reliability of the connection point between the heat exchange tube 2 and the manifold 1.

[0084] In some embodiments, the wall thickness of the first main body 11 is defined as T1, the wall thickness of the heat exchange tube 2 is defined as T2, the dimension S1 of the first welded part 4 in the thickness direction of the first main body 11 satisfies: 2*T2≤S1≤T1, and / or, the dimension S2 of the first welded part 11 in the direction perpendicular to the thickness of the first main body 11 satisfies: S2≥2*T2+L3.

[0085] Specifically, such as Figure 9 As shown, the first welded part 4 has a dimension S1 in the thickness direction of the first main body 11, that is, in Figure 9 In the X direction shown, the dimension S1 satisfies 2*T2≤S1≤T1. S1 is the dimension of the first welded part 4 in the thickness direction of the first main body 11, and it is also the penetration depth after laser welding of the manifold 1 and the heat exchange tube 2. After the heat exchange tube 2 and the manifold 1 are welded to the first wall surface 11a, if S1 is within this range, the manifold 1 and the heat exchange tube 2 are well welded, the weld strength is high, and the reliability of the connection between the heat exchange tube 2 and the manifold 1 is improved. When S1<2*T2, the penetration depth after welding the manifold 1 and the heat exchange tube 2 is small, which is insufficient to form a good weld joint. The strength at the joint is low, which affects the reliability of heat exchange. The wall thickness T1 of the manifold 1 of the heat exchanger is generally greater than the wall thickness T2 of the heat exchange tube 2, and the penetration depth after welding the manifold 1 and the heat exchange tube 2 does not exceed the wall thickness T1 of the manifold 1.

[0086] The dimension S2 of the first welded portion 11 in the direction perpendicular to the thickness of the first main body 11, that is... Figure 9 In the Y direction shown, the dimension S2 satisfies: S2 ≥ 2*T2 + L3, where L3 is the single-sided gap between the outer wall of the heat exchange tube 2 and the first main body 11 in the thickness direction perpendicular to the first main body. S2 is the dimension of the first welded part 4 in the thickness direction perpendicular to the first main body 11, and it is also the weld width after laser welding of the manifold 1 and the heat exchange tube 2. After the heat exchange tube 2 and the manifold 1 are welded near the first wall surface 11a, if the dimension S2 is within this range, the weld between the manifold 1 and the heat exchange tube 2 is good, the weld strength is high, and the base materials of the manifold 1 and the heat exchange tube 2 are melted after welding, forming a good weld, reducing the risk of leakage at the connection between the manifold 1 and the heat exchange tube 2, and improving the reliability of the connection between the heat exchange tube 2 and the manifold 1. When S2 < 2*T2 + L3, the weld width after welding the manifold 1 and the heat exchange tube 2 is small, the weld joint strength at the connection between the heat exchange tube 2 and the manifold 1 is low, and there may be welding defects at this connection, reducing the reliability of the heat exchanger.

[0087] The dimension S1 of the first welded part 4 in the thickness direction of the first main body 11 satisfies: 2*T2≤S1≤T1, and the dimension S2 of the first welded part 11 in the thickness direction perpendicular to the first main body 11 satisfies: S2≥2*T2+L3. This ensures that the first welded part 4 formed after the welding of the manifold 1 and the heat exchange tube 2 is well welded in multiple directions, improves the strength of the weld, improves the reliability of the connection between the heat exchange tube 2 and the manifold 1, reduces the risk of heat exchanger leakage, and improves the reliability of the heat exchanger.

[0088] In some embodiments, the dimension S1 of the first welded portion 4 in the thickness direction of the first body member 11 is ≥ 0.5 mm, and / or, in the thickness direction of the first body member 11, the dimension of the first welded portion 11 extending beyond the first wall surface 11a is no more than 0.2 mm + 0.3 T1.

[0089] Specifically, the dimension S1 of the first welded portion 4 in the thickness direction of the first main body 11 is ≥ 0.5 mm. For example, it can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, etc. This ensures that a good welded joint is formed at the connection between the heat exchanger tube 2 and the first wall surface 11a of the manifold 1, improving the strength and reliability of the connection between the heat exchanger tube 2 and the manifold 1. When S1 is less than 0.5 mm, the size of the connection between the manifold 1 and the heat exchanger tube 2 after welding is small, the joint strength is low, and the reliability of the heat exchanger is affected.

[0090] In some embodiments, in the thickness direction of the first main body 11, the dimension of the first welded portion 11 extending beyond the first wall surface 11a is less than or equal to 0.2mm + 0.3T1. For example, it can be 0.2mm + 0.3T1, 0.2mm + 0.1T1, 0.2mm, 0mm, etc. After the heat exchange tube 2 is inserted into the first hole 111, in the thickness direction X of the first main body 11, the dimension L1 of the heat exchange tube 2 protruding from the first hole 111 does not exceed 0.5T1. After the heat exchange tube 2 and the first main body 11 are welded, a first welded portion 4 is formed. The first welded portion 4 has a certain dimension S1 in the thickness direction of the first main body 11. After welding, the dimension of the first welded portion 11 extending beyond the first wall surface 11a does not exceed 0.2mm + 0.3T1, so that after welding, a good joint is formed at the connection between the heat exchange tube 1 and the first wall surface 11a, reducing the risk of leakage, improving the reliability of the heat exchanger, and the appearance of the weld is good. When the first welded part 11 extends beyond the first wall surface 11a by more than 0.2mm + 0.3T1 after welding, the stress of the first welded part 11 is too high, and its strength will be reduced. During the use of the heat exchanger, stress cracking may occur and leakage may occur, affecting the service life of the heat exchanger.

[0091] In some specific embodiments, in the thickness direction of the first main body 11, the first welded portion 11 extends beyond the first wall surface 11a by no more than 0.5 mm. For example, it can be 0.45 mm, 0.4 mm, 0.3 mm, 0.2 mm, 0.1 mm, 0 mm, etc., so that after welding, a good joint is formed at the connection between the heat exchange tube 1 and the first wall surface 11a, reducing the risk of leakage and improving the reliability of the heat exchanger.

[0092] In some embodiments, the heat exchanger 100 further includes a third welded portion 6, which connects the first main body 11 and the second main body 12.

[0093] Specifically, in this application, the manifold 1 is welded to the heat exchange tube 2 at the first wall surface 11a of the first main body 11. The first wall surface 11a is located on the inner wall of the manifold 1. The manifold 1 includes two parts: the first main body 11 and the second main body 12. After welding the first wall surface 11a of the manifold 1 to the heat exchange tube 2, the first main body 11 and the second main body 12 need to be welded together to complete the sealing of the manifold 1. After the first main body 11 and the second main body 12 are welded, a third welded part 6 is formed, which connects the first main body 11 and the second main body 12. Figure 10 The diagram illustrates the location where the third welded portion 6 is partially formed. The first main body 11 and the second main body 12 are welded together at their joint, thereby increasing the strength of the joint and reducing the risk of leakage of the current collector 1 at this joint, thus improving the reliability of the heat exchanger. Optionally, laser welding, argon arc welding, or other methods can be used to connect the first main body 11 and the second main body 12; no limitation is imposed here.

[0094] In some embodiments, the heat exchange tube 2 further includes a protrusion 21 that protrudes from the surface of the heat exchange tube 2 and is close to the end of the heat exchange tube 2 in its length direction. At least a portion of the protrusion 21 abuts against the second wall surface 11b.

[0095] Specifically, he, such as Figure 5 As shown, the heat exchange tube 2 also includes a protrusion 21, which protrudes from the surface of the heat exchange tube 2. The protrusion 21 is located near the end of the heat exchange tube 2 in its length direction. When the heat exchange tube 2 is inserted into the manifold 1, at least part of the protrusion 21 abuts against the second wall surface 11b, thereby positioning the heat exchange tube 2 inserted into the first main body 11. This ensures that multiple heat exchange tubes inserted into the first main body 11 are in the same position, making it easier to maintain the consistency of the insertion position when multiple heat exchange tubes 2 are inserted. It also makes subsequent welding of the heat exchange tube 2 and the first wall surface 11a more convenient and accurate, thereby improving welding reliability and thus improving the reliability of the heat exchanger.

[0096] Optionally, the protrusion 21 can be provided on the side of the heat exchange tube 2 in the Y direction, as long as it can achieve positioning; the protrusion 21 can be an integral structure with the heat exchange tube 2 or a separate structure, which is not limited here.

[0097] In some embodiments, the heat exchanger 100 further includes fins 3, which are made of aluminum or aluminum alloy. The fins 3 are located between adjacent heat exchange tubes 2 and are welded to the heat exchange tubes 2. Alternatively, the heat exchange tubes 2 pass through the fins 3 and are welded to the fins 3.

[0098] Specifically, the heat exchanger 100 also includes fins 3, which are made of pure aluminum or aluminum alloy. Since aluminum has higher thermal conductivity than stainless steel, using fins made of pure aluminum or aluminum alloy can better improve the heat exchange efficiency of the heat exchanger.

[0099] Heat exchanger 100 can be like Figures 1-3 As shown, fin 3 is a corrugated fin. Fin 3 is located between adjacent heat exchange tubes 2 and is connected to heat exchange tubes 2 by welding. This reduces the connection gap between heat exchange tubes 2 and fin 3, reduces the thermal resistance of the heat exchanger, and improves the heat exchange efficiency of the heat exchanger.

[0100] Heat exchanger 100 can also be like Figure 11-12 As shown, the fin 3 has a plate-like structure, and the heat exchange tube 2 passes through the fin 3. The heat exchange tube 2 is inserted into the fin 3 from the opening on the side of the fin 3 and connected to the fin 3. The heat exchange tube 2 and the fin 3 are connected by welding, which reduces the connection gap between the heat exchange tube 2 and the fin 3, reduces the thermal resistance of the heat exchanger, and improves the heat exchange efficiency of the heat exchanger.

[0101] Heat exchanger 100 can also be like Figure 13 As shown, the fin 3 has a plate-like structure, and the heat exchange tube 2 passes through the fin 3. The heat exchange tube 2 passes through the fin hole on the fin 3 and is connected to the fin 3. The heat exchange tube 2 and the fin 3 can be connected by welding, which reduces the connection gap between the heat exchange tube 2 and the fin 3, reduces the thermal resistance of the heat exchanger, and improves the heat exchange efficiency of the heat exchanger.

[0102] Optionally, the heat exchanger 100 can be a single-row structure, or a double-row or multi-row structure. For example... Figure 2 or Figure 11 As shown, the heat exchanger has a single-row structure, such as... Figure 3 As shown, the heat exchanger has a three-row structure.

[0103] It should be noted that, in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or unit from another, and do not necessarily require or imply any such actual relationship or order between these entities or units. Furthermore, in this document, "a plurality of" means at least two, unless otherwise explicitly specified.

[0104] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0105] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0106] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0107] The above are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for processing a heat exchanger, characterized in that, include: Take the first main body of the manifold, the first main body includes a first wall and a second wall arranged along its thickness direction, insert the heat exchange tube into the first hole from the second wall, the first hole is provided in the first main body, the first hole passes through the first wall and the second wall, define 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 is less than or equal to 0.5T1; Laser welding is used to connect the heat exchange tube to the first wall surface; A bonding agent is applied to the joint between the heat exchange tube and the second wall to connect the joint between the heat exchange tube and the second wall.

2. The heat exchanger processing method according to claim 1, characterized in that, During laser welding, the laser beam is at a predetermined angle to the first wall surface, and the predetermined angle is in the range of 90°±5°.

3. The heat exchanger processing method according to claim 1, characterized in that, The manifold also includes a second main body component, which is welded together with the first main body component and the second main body component.

4. The heat exchanger processing method according to claim 1, characterized in that, In the step of inserting the heat exchange tube into the first hole, the first main body is fixed, and the multiple heat exchange tubes are kept in the same position after being inserted into the first hole.

5. The heat exchanger processing method according to claim 1, characterized in that, 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 main body is less than or equal to 0.25T1; and / or, after the heat exchange tube is inserted into the first hole, the gap between the outer wall of the heat exchange tube and the first main body in the direction perpendicular to the thickness of the first main body is less than or equal to 0.05mm.

6. The heat exchanger processing method according to any one of claims 1-5, characterized in that, In the laser welding step, the outline of the connection between the heat exchange tube and the first wall is scanned, and after confirming the welding position, laser welding is performed on the connection between the heat exchange tube and the first wall.

7. The heat exchanger processing method according to any one of claims 1-5, characterized in that, The bonding agent is a paste solder, which includes aluminum-silicon solder paste, and is used to weld the connection between the heat exchange tube and the second wall surface.

8. The heat exchanger processing method according to any one of claims 1-5, characterized in that, The connector is an adhesive. After the fins and the heat exchange tube are welded together, the heat exchange tube and the second wall surface are bonded together with adhesive.

9. The heat exchanger processing method according to any one of claims 1-5, characterized in that, Its features are, Assemble the heat exchange tube and fins, and weld the fins and the heat exchange tube.

10. A heat exchanger, characterized in that, include: The manifold is made of stainless steel and has a pipe wall. The pipe wall includes at least a portion of a first main body and at least a portion of a second main body. The first main body has a first hole that penetrates through the first main body. The first main body also includes a first wall surface and a second wall surface arranged along the thickness direction of the first main body. The first wall surface is located inside the cavity of the manifold, and the second wall surface is located outside the cavity of the manifold. The heat exchange tube is made of stainless steel. The heat exchange tube passes through the first hole and is connected to the manifold. A first welded part is formed at the connection between the heat exchange tube and the manifold on the first wall surface, and a second connection part is formed at the connection between the heat exchange tube and the manifold on the second wall surface.

11. The heat exchanger according to claim 10, characterized in that, The first welded part is formed by laser welding.

12. The heat exchanger according to claim 10, characterized in that, The second connection is formed by welding, or the second connection is formed by adhesive bonding.

13. The heat exchanger according to claim 10, characterized in that, The first welded portion extends circumferentially along the heat exchange tube, and / or the second connecting portion extends circumferentially along the heat exchange tube.

14. The heat exchanger according to any one of claims 10-13, characterized in that, The wall thickness of the first main body is defined as T1, and the wall thickness of the heat exchange tube is defined as T2. The dimension S1 of the first welded part in the thickness direction of the first main body satisfies: 2*T2≤S1≤T1, and / or, the dimension S2 of the first welded part in the direction perpendicular to the thickness of the first main body satisfies: S2≥2*T2+L3, where L3 is the gap between the outer wall of the heat exchange tube and the first main body in the direction perpendicular to the thickness of the first main body.

15. The heat exchanger according to any one of claims 10-13, characterized in that, The dimension S1 of the first welded part in the thickness direction of the first main body is ≥ 0.5 mm, and / or, the wall thickness of the first main body is defined as T1, and the dimension of the first welded part extending beyond the first wall surface in the thickness direction of the first main body is no 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 also includes a protrusion that protrudes from the surface of the heat exchange tube and is located near the end of the heat exchange tube in its length direction. At least a portion of the protrusion abuts against the second wall surface.

17. The heat exchanger according to any one of claims 10-13, characterized in that, The heat exchanger further includes a third welded part, which connects 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 also includes fins made of aluminum or aluminum alloy. The fins are located between adjacent heat exchange tubes and are welded to the heat exchange tubes; or, the heat exchange tubes pass through the fins and are welded to the fins.

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