Heat exchanger and machining method of heat exchanger

Abstract

The invention relates to a heat exchanger and a machining method of the heat exchanger, the heat exchanger comprises fins and a heat exchange tube, the fins comprise first holes, the heat exchange tube comprises a tube wall and a turbulent flow part, and the turbulent flow part is located in the heat exchange tube; the heat exchange tubes penetrate through the first holes and are connected with the fins; the heat exchange tube further comprises at least one circulation channel, and the wall enclosing the circulation channel comprises at least part of the tube wall and at least part of the turbulent flow part. The pipe wall comprises a first layer and a second layer, the second layer comprises a solder layer, and at least one side of the first layer is connected with the second layer in the thickness direction of the pipe wall. The heat exchange efficiency of the heat exchanger on the air side can be improved by welding the heat exchange tubes and the fins through the welding flux layers, the heat exchange efficiency of the heat exchanger on the heat exchange medium side can be improved through the turbulent flow parts arranged in the heat exchange tubes, the heat exchange uniformity of the air side and the heat exchange medium side is high, and the heat exchange efficiency of the heat exchanger is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, in particular to a heat exchanger and a processing method thereof. Background Art

[0002] In the related art, a heat exchanger includes fins and heat exchange tubes. When assembling the heat exchanger, the heat exchange tubes are passed through the fins, and an expanding operation is performed on the heat exchange tubes to realize the connection between the heat exchange tubes and the fins. However, this connection method results in a gap between the heat exchange tubes and the fins, leading to an excessive thermal resistance between the heat exchange tubes and the fins and reducing the heat exchange performance of the heat exchanger. Summary of the Invention

[0003] The present application provides a heat exchanger and a processing method thereof to improve the heat exchange performance of the heat exchanger.

[0004] In a first aspect of an embodiment of the present application, a heat exchanger is provided, including:

[0005] Fins, the fins including a first hole;

[0006] Heat exchange tubes, the heat exchange tubes including a tube wall and a turbulator, the turbulator being located inside the heat exchange tubes; the heat exchange tubes penetrate through the first hole and are connected to the fins;

[0007] The heat exchange tubes further include at least one flow channel, and the wall enclosing the flow channel includes at least part of the tube wall and at least part of the turbulator;

[0008] The tube wall includes a first layer and a second layer, the second layer including a solder layer, and along the thickness direction of the tube wall, at least one side of the first layer is connected to the second layer.

[0009] The tube wall of the heat exchange tube in this embodiment includes a first layer and a second layer, that is, the tube wall of the heat exchange tube can be a combination of multiple layers of materials, and the second layer includes a solder layer. There is no need to additionally provide a solder layer on the tube wall, which is convenient for welding the heat exchange tube and the fins. After welding, there is no gap or a very small gap between the outer wall of the heat exchange tube and the first hole of the fins, thereby reducing the thermal resistance of the heat exchanger and improving the heat exchange efficiency between the gas in the air duct and the heat exchange medium in the flow channel of the heat exchange tube, and improving the heat exchange efficiency of the heat exchanger on the air side. The turbulator in this embodiment can play a role in disturbing the heat exchange medium in the flow channel, enhancing the turbulence degree of the heat exchange medium in the flow channel, and increasing the contact area between the heat exchange tube and the heat exchange medium, thereby improving the heat exchange efficiency of the heat exchanger. Therefore, welding the heat exchange tube and the fins through the solder layer can improve the heat exchange efficiency of the heat exchanger on the air side, and the turbulator provided inside the heat exchange tube can improve the heat exchange efficiency of the heat exchanger on the heat exchange medium side, and make the heat exchange uniformity on the air side and the heat exchange medium side relatively high, further improving the heat exchange efficiency of the heat exchanger.

[0010] In a specific embodiment, there is one flow channel, and the flow disturbing part is integrally formed with the pipe wall.

[0011] In a specific embodiment, there are at least two flow channels, and the flow disturbing part is integrally formed with the pipe wall, or the flow disturbing part is fixedly connected to the pipe wall.

[0012] In a specific embodiment, the pipe wall has the solder layer inside the heat exchange tube, and / or the flow disturbing part has the solder layer inside the heat exchange tube, and the flow disturbing part is connected to the pipe wall through the solder layer.

[0013] In a specific embodiment, the pipe wall and / or the flow disturbing part has a convex structure, and the convex structure is located inside the heat exchange tube.

[0014] In a specific embodiment, the flow disturbing part is a convex on the pipe wall, and the height of the convex is less than or equal to 1 / 2 of the diameter of the heat exchange tube.

[0015] On the other hand, the present application provides a processing method of a heat exchanger, and the processing method of the heat exchanger includes:

[0016] Take a sheet;

[0017] Bend the sheet;

[0018] Perform metallurgical bonding on the bent sheet to make the sheet circumferentially closed to form a heat exchange tube;

[0019] Take a fin, pass the heat exchange tube through the first hole of the fin, and fixedly connect the heat exchange tube to the fin;

[0020] Weld the fixedly connected heat exchange tube and the fin.

[0021] In this embodiment, the heat exchange tube is formed by bending a sheet, so that the structure of the formed heat exchange tube is more flexible. The formed heat exchange tube can have specific characteristics by changing the material and structure of the sheet to meet the use requirements. When the heat exchanger is processed, after passing the heat exchange tube through the first hole of the fin, the two are connected by welding. The heat exchange tube and the fin no longer use a connection method such as expanding the tube that has mechanical wear, thereby reducing the risk that the internal structure of the heat exchange tube is damaged and the heat exchange performance on the heat exchange medium side decreases. When the heat exchange tube and the fin are welded, there is no gap or a very small gap between the outer wall of the heat exchange tube and the first hole of the fin, thereby reducing the thermal resistance of the heat exchanger, improving the heat exchange efficiency between the gas in the air duct and the heat exchange medium in the flow channel of the heat exchange tube, and improving the heat exchange efficiency of the heat exchanger on the air side.

[0022] In a specific embodiment, when the bent plate is metallurgically bonded to form a heat exchange tube with a circumferentially closed plate, the processing method includes:

[0023] High-frequency welding the bent plate, or, spin-sealing the bent plate, or, pressure-processing and sealing the bent plate.

[0024] On the other hand, an embodiment of the present application provides a processing method for a heat exchanger, and the processing method for the heat exchanger includes:

[0025] Take a plate;

[0026] Bend and pre-fix the plate;

[0027] There is a preset gap t between the two ends of the pre-fixed plate along the circumferential direction, and the preset gap t is less than 0.5 mm;

[0028] Take fins, pass the pre-fixed plate through the first holes of the fins, and fixedly connect the pre-fixed plate and the fins;

[0029] Weld the pre-fixed plate and the fins, and weld the two ends of the pre-fixed plate along the circumferential direction.

[0030] In this embodiment, when the preset gap between the first end and the second end of the circumferentially unclosed heat exchange tube is less than 0.5 mm after pre-fixation, during the welding process, the gap between the first end and the second end is small, and the brazing layer enters the preset gap under capillary action, so as to fully fill the preset gap and improve the welding reliability of the first end and the second end. And in this embodiment, when the circumferentially unfixed heat exchange tube is welded to the fins, the first end and the second end of the circumferentially unfixed heat exchange tube are welded, so that multiple welding operations are not required, and the processing efficiency is improved.

[0031] In addition, the heat exchange tube of the embodiment of the present application is formed by bending a plate, so that the structure of the formed heat exchange tube is more flexible, and the formed heat exchange tube can have specific characteristics by changing the material and structure of the plate to meet the use requirements. When the heat exchanger is processed, after passing the heat exchange tube through the first holes of the fins, the two are connected by welding. The heat exchange tube and the fins are no longer connected by means such as expanding the tube that cause mechanical wear, so as to reduce the risk that the internal structure of the heat exchange tube is damaged and the heat exchange performance on the heat exchange medium side decreases. When the heat exchange tube and the fins are welded, there is no gap or a very small gap between the outer wall of the heat exchange tube and the first holes of the fins, so as to reduce the thermal resistance of the heat exchanger and improve the heat exchange efficiency between the gas in the air duct and the heat exchange medium in the flow channel of the heat exchange tube, and improve the heat exchange efficiency of the heat exchanger on the air side.

[0032] In a specific embodiment, when pre-fixing the bent plate, the processing method includes:

[0033] Pre - fix the bent sheet by a clamp, or pre - fix the bent sheet by pressing, or pre - fix the two circumferential ends of the bent sheet by spot welding, or, during the bending process of the sheet, press and pre - fix it from the inner side of the sheet.

[0034] In a specific embodiment, before bending the sheet, the processing method further includes: stamping or rolling to form protrusions on the surface of the sheet; or,

[0035] After bending the sheet, the processing method further includes: spin - rolling the bent sheet to form protrusions.

[0036] In a specific embodiment, when bending the sheet, a flow - disturbing portion is formed inside the sheet.

[0037] In a specific embodiment, the combined length of the circumferentially closed heat - exchange tube is L, and the minimum thickness of the sheet is d, where L≥d / 2. It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic structural diagram of the heat exchanger provided by the present application in a specific embodiment;

[0039] Figure 2 Partial structural diagram of the heat exchanger provided by the present application in a specific embodiment;

[0040] Figure 3 is Figure 2 Front view of the heat - exchange tube in in a specific embodiment;

[0041] Figure 4 Partial structural diagram of the heat exchanger provided by the present application in another specific embodiment;

[0042] Figure 5 Front view of the heat - exchange tube provided by the present application in a specific embodiment;

[0043] Figure 6 Cross - sectional view of the heat - exchange tube provided by the present application in yet another specific embodiment;

[0044] Figure 7 Cross - sectional view of the heat - exchange tube provided by the present application in yet another specific embodiment;

[0045] Figure 8 Front view of the heat - exchange tube provided by the present application in yet another specific embodiment;

[0046] Figure 9Schematic diagram of the heat exchange tube provided in this application in yet another specific embodiment;

[0047] Figure 10 Schematic diagram of the heat exchange tube provided in this application in yet another specific embodiment;

[0048] Figure 11 Schematic diagram of the heat exchange tube provided in this application in yet another specific embodiment;

[0049] Figure 12 Schematic diagram of the heat exchange tube provided in this application in yet another specific embodiment;

[0050] Figure 13 Schematic diagram of the heat exchange tube provided in this application in yet another specific embodiment;

[0051] Figure 14 Schematic diagram of the heat exchange tube provided in this application in yet another specific embodiment;

[0052] Figure 15 Front view of the heat exchange tube provided in this application in yet another specific embodiment;

[0053] Figure 16 Front view of the heat exchange tube provided in this application in yet another specific embodiment;

[0054] Figure 17 Schematic diagram of the circumferentially unclosed heat exchange tube during the heat exchanger processing in a specific embodiment;

[0055] Figure 18 is Figure 17 front view;

[0056] Figure 19 Schematic diagram of the circumferentially unclosed heat exchange tube during the heat exchanger processing in a specific embodiment;

[0057] Figure 20 is Figure 19 front view;

[0058] Figure 21 Schematic diagram of the circumferentially unclosed heat exchange tube during the heat exchanger processing in a specific embodiment;

[0059] Figure 22 is Figure 21 front view;

[0060] Figure 23 Schematic diagram of the circumferentially unclosed heat exchange tube during the heat exchanger processing in a specific embodiment;

[0061] Figure 24 isFigure 23 Front view.

[0062] Description of reference numerals:

[0063] 1 - Heat exchange tube;

[0064] 11 - Flow passage;

[0065] 12 - Tube wall;

[0066] 13 - Turbulence part;

[0067] 131 - First turbulence part;

[0068] 132 - Second turbulence part;

[0069] 14 - First layer;

[0070] 15 - Second layer;

[0071] 2 - Fin;

[0072] 3 - Circumferentially unclosed heat exchange tube;

[0073] 31 - First end;

[0074] 32 - Second end;

[0075] 4 - Header.

[0076] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application. Detailed implementation manners

[0077] It should be clear that the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope protected by this application.

[0078] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. The singular forms of "a", "the" and "said" 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.

[0079] It should be understood that the term "and / or" used herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0080] It should be noted that the orientation terms such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described from the angles shown in the drawings, and should not be construed as limitations on the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that one component is connected "above" or "below" another component, it can not only be directly connected "above" or "below" another component, but also be indirectly connected "above" or "below" another component through an intermediate component.

[0081] To better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0082] As Figure 1 shown, Figure 1 FIG. is a schematic structural diagram of the heat exchanger provided by the present application in a specific embodiment. The heat exchanger includes two headers 4, at least one heat exchange tube 1, and at least two fins 2. The heat exchange tube 1 extends along its length direction and communicates with the two headers 4. The fins 2 are connected to the heat exchange tube 1, and an air duct for gas flow is formed between adjacent fins 2. The connected heat exchange tube 1 and header 4 form a flow channel for heat exchange medium flow, so that the gas in the air duct exchanges heat with the heat exchange medium in the heat exchange tube 1.

[0083] In the related art, when assembling a heat exchanger, a typical method is to connect the heat exchanger and the fins by expanding the tube. That is, the fin has a first hole. When assembling the heat exchanger, the heat exchange tube passes through the first hole, and there is a gap between the side wall of the first hole and the outer wall of the heat exchange tube. Then, an expanding operation is performed on the heat exchange tube to fixedly connect the heat exchange tube to the side wall of the first hole. This assembling method results in a gap between the heat exchange tube and the side wall of the first hole, resulting in a large thermal resistance and reducing the heat exchange efficiency of the heat exchanger.

[0084] To solve this technical problem, the embodiments of the present application provide a heat exchanger. As Figure 2 shown, Figure 2 FIG. is a partial structural schematic diagram of the heat exchanger provided by the present application in a specific embodiment. The heat exchanger includes at least two fins 2 and at least one heat exchange tube 1. The fin 2 is provided with at least one first hole. The heat exchange tube 1 passes through the first hole of the fin 2 and is connected to the side wall of the first hole. Among them, the heat exchange tube 1 is a tubular structure formed by bending a plate, and the heat exchange tube 1 forms at least one flow channel 11 for heat exchange medium flow through bending the plate. The plate described in this embodiment is a flat plate structure. When processing the heat exchanger, the flat plate structure of the plate is bent and circumferentially closed to form the heat exchange tube 1.

[0085] As Figure 3 shown, Figure 3 For Figure 2A front view of the heat exchange tube in a specific embodiment. In this embodiment, the heat exchange tube 1 includes a tube wall 12, and the tube wall 12 includes a first layer 14 and a second layer 15 along its thickness direction. Along the thickness direction of the tube wall 12, at least one side of the first layer 14 is connected to the second layer 15. In a specific embodiment, the first layer 14 is connected to the second layer 15 on at least the side away from the inside of the heat exchange tube 1. The second layer 15 includes a solder layer, and the heat exchange tube 1 is welded to the fin 2 through the solder layer after passing through the first hole of the fin 2. Compared with traditional heat exchange tubes, such as extruded heat exchange tubes such as expansion tubes, which can only be single-layer materials, the tube wall 12 of the heat exchange tube 1 in this embodiment includes the first layer 14 and the second layer 15, that is, the tube wall 12 of the heat exchange tube 1 can be a combination of multiple layers of materials, and the second layer 15 includes a solder layer. Figure 2 During the processing of the heat exchanger shown, the heat exchange tube 1 is passed through the first hole of the fin 2 and then the two are welded together through a solder layer. The heat exchange tube and fin are no longer connected using methods such as expansion tubes that may cause mechanical wear, thereby reducing the risk of damage to the internal structure of the heat exchange tube 1 and resulting in reduced heat exchange performance on the heat exchange medium side. When the plate material bent to form the heat exchange tube 1 includes a solder layer, it facilitates welding of the heat exchange tube 1 and the fin 2. After welding, there is no gap or a very small gap between the outer wall of the heat exchange tube 1 and the first hole of the fin 2, thereby reducing the thermal resistance of the heat exchanger, improving the heat exchange efficiency between the gas in the air duct and the heat exchange medium in the circulation channel 11 of the heat exchange tube 1, and improving the heat exchange efficiency of the heat exchanger on the air side.

[0086] The first layer 14 may be made of aluminum or an aluminum alloy. The second layer 15 may be made of aluminum or an aluminum alloy and may also include silicon, with the mass percentage of silicon being 2 wt.% to 12 wt.%. In this embodiment, when the mass percentage of silicon in the second layer 15 is 2 wt.% to 12 wt.%, welding can be better achieved.

[0087] Of course, the first layer 14 and the second layer 15 in the present application may also be made of other materials, and the present application does not limit the materials of the first layer and the second layer and the content of each element.

[0088] In a specific embodiment, Figure 4 and Figure 5 As shown, Figure 4 This is a schematic diagram of the partial structure of the heat exchanger provided in this application in another specific embodiment; Figure 5This is a front view of a specific embodiment of the heat exchange tube provided in this application. The heat exchange tube 1 includes a tube wall 12 and a flow spoiler 13. The flow spoiler 13 is located inside the heat exchange tube 1 and connected to the tube wall 12. The tube wall 12 and the flow spoiler 13 enclose the at least one circulation channel 11. The wall enclosing the circulation channel 11 includes at least a portion of the tube wall 12 and at least a portion of the flow spoiler 13. The flow spoiler 13 in this embodiment can disrupt the flow of the heat exchange medium in the circulation channel 11, enhance the turbulence of the heat exchange medium in the circulation channel 11, and increase the contact area between the heat exchange tube 1 and the heat exchange medium, thereby improving the heat exchange efficiency of the heat exchanger.

[0089] Therefore, in the embodiment of the present application, the heat exchange tube 1 is welded to the fin 2 through the solder layer to improve the heat exchange efficiency of the heat exchanger on the air side. The spoiler 13 arranged inside the heat exchange tube 1 can improve the heat exchange efficiency of the heat exchanger on the heat exchange medium side, and make the heat exchange uniformity between the air side and the heat exchange medium side higher, thereby further improving the heat exchange efficiency of the heat exchanger.

[0090] The plate material bent to form the heat exchange tube 1 may be one piece or multiple pieces. Figure 3 In the embodiment of FIG, the plate material that is bent to form the heat exchange tube 1 is a single piece. Figure 5 In the illustrated embodiment, the heat exchange tube 1 includes a flow spoiler 13 , and when the flow spoiler 13 and the tube wall 12 are integrally formed, the plate material bent to form the heat exchange tube 1 is a single piece.

[0091] In other embodiments, when the flow spoiler 13 is fixedly connected to the tube wall 12, the plate material bent to form the heat exchange tube 1 is multiple sheets. In this embodiment, the tube wall 12 of the heat exchange tube 1 includes a first layer 14 and a second layer 15. The first layer 14 is connected to the second layer 15 on at least one side located inside the heat exchange tube 1. The second layer 15 includes a solder layer, which is used to weld the tube wall 12 and the flow spoiler 13. In another specific embodiment, along the thickness direction of the tube wall 12, both sides of the first layer 14 are connected to the second layer 15, and the second layer 15 includes a solder layer. The solder layer on the side facing away from the interior of the heat exchange tube 1 is used to weld the heat exchange tube 1 and the fins, while the solder layer on the side located inside the heat exchange tube 1 is used to weld the tube wall 12 and the flow spoiler 13.

[0092] Figure 6 This is a cross-sectional view of another specific embodiment of the heat exchange tube provided in this application. Figure 7 This is a cross-sectional view of another specific embodiment of the heat exchange tube provided in this application. Figure 8 This is a front view of a heat exchange tube provided in the present application in yet another specific embodiment. Figures 5 - 8In the illustrated embodiment, the turbulator 13 of the heat exchange tube 1 is a structure integrally formed with the tube wall 12, and the turbulator 13 protrudes towards the interior of the heat exchange tube 1 relative to the tube wall 12. In this embodiment, the turbulator 13 can be a structure integrally formed with the tube wall 12, and the turbulator 13 is a structure protruding relative to the tube wall 12 of the heat exchange tube 1. The turbulator 13 protrudes towards the interior of the heat exchange tube 1. At this time, the turbulator 13 and the tube wall 12 enclose a flow channel 11. The turbulator 13 in this embodiment can increase the contact area between the inside of the heat exchange tube 1 and the heat exchange medium, and can also enhance the turbulence degree of the heat exchange medium in the flow channel 11, improving the heat exchange performance. At the same time, since the heat exchange tube 1 is formed by bending a sheet, the turbulator 13 can be processed on the sheet before the heat exchange tube is formed, which is more flexible than the internal structure of the traditional extruded heat exchange tube. The turbulator 13 can be made into more shapes, such as cross-shaped threads, multi-layer turbulators, etc., further increasing the contact area between the inside of the heat exchange tube and the heat exchange medium, increasing the turbulence degree, and improving the heat exchange performance.

[0093] As Figure 6 In the illustrated embodiment, the turbulator 13 can be a spiral structure, that is, it can be an internal thread provided on the tube wall 12.

[0094] As Figure 7 In the illustrated embodiment, the turbulator 13 can be a plurality of bosses spaced apart on the tube wall 12, and the bosses can be in the shapes of frustum cones, cones, hemispheres, etc.

[0095] As Figure 8 In the illustrated embodiment, the turbulator 13 can be a plurality of bosses spaced apart on the tube wall 12, and the height of the bosses is relatively large, that is, the height of the turbulator 13 protruding relative to the tube wall 12 is relatively high, and one end of each turbulator 13 facing away from the tube wall 12 approaches each other.

[0096] In a specific embodiment, as Figure 6 and Figure 7 shown, when the turbulator 13 is a protrusion provided on the tube wall 12, the height of the protrusion can be less than or equal to 1 / 2 of the inner diameter of the heat exchange tube 1, where the inner diameter of the heat exchange tube 1 is the inner diameter of the heat exchange tube 1. For example, the height of the protrusion can be 1 / 4, 1 / 3, 1 / 2, etc. of the inner diameter of the heat exchange tube 1. Since the heat exchange tube 1 and the fin 2 are connected by welding instead of by expanding the tube of the heat exchange tube 1, the height of the protrusion inside the heat exchange tube 1 can be made very large, and the internal structure deformation after tube expansion can be avoided, improving the service life of the heat exchange tube 1 and the heat exchanger.

[0097] In this embodiment, the protrusion height of the flow disturbing part 13 is appropriate, which can play a role in disturbing the heat exchange medium in the heat exchange tube 1, and will not overly occupy the space inside the heat exchange tube 1, so that the flow passage 11 of the heat exchange tube 1 has a relatively large cross-sectional area, thereby enabling a relatively large flow rate of the heat exchange medium in the heat exchange tube 1, and making the heat exchange efficiency of the heat exchanger relatively high.

[0098] In other embodiments, such as Figures 9 - 14 shown, Figure 9 is a schematic structural diagram of the heat exchange tube provided by the present application in yet another specific embodiment; Figure 10 is a schematic structural diagram of the heat exchange tube provided by the present application in yet another specific embodiment; Figure 11 is a schematic structural diagram of the heat exchange tube provided by the present application in yet another specific embodiment; Figure 12 is a schematic structural diagram of the heat exchange tube provided by the present application in yet another specific embodiment; Figure 13 is a schematic structural diagram of the heat exchange tube provided by the present application in yet another specific embodiment; Figure 14 is a schematic structural diagram of the heat exchange tube provided by the present application in yet another specific embodiment. In this embodiment, at least one flow disturbing part 13 is arranged in the heat exchange tube 1, and the at least one flow disturbing part 13 and the tube wall 12 enclose at least two flow passages 11, and the at least two flow passages 11 are separated by the flow disturbing part 13. The flow disturbing part 13 in this embodiment can increase the contact area between the heat exchange tube 1 and the heat exchange medium, and improve the turbulence degree of the heat exchange medium in the heat exchange tube 1, thereby improving the heat exchange efficiency of the heat exchanger.

[0099] In a specific embodiment, Figure 9 , Figure 11 and Figure 13 in the embodiments shown, the flow disturbing part 13 and the tube wall 12 can be fixedly connected. There is no need to arrange the flow disturbing part 13 on the plate material bent to form the heat exchange tube 1. The flow disturbing part 13 can be processed separately. That is, one plate material can be bent into the tube wall 12 of the heat exchange tube 1, and another plate material forms the flow disturbing part 13 of the heat exchange tube 1, and then the flow disturbing part 13 is placed inside the tube wall 12 to form the heat exchange tube 1 with the flow disturbing part 13, thereby simplifying the difficulty of plate material processing.

[0100] It should be noted here that the flow disturbing part of the heat exchange tube 1 can also be formed by 2, 3 or more plate materials to increase the contact area between the heat exchange tube 1 and the heat exchange medium, improve the turbulence degree of the heat exchange medium in the heat exchange tube 1, and thereby improve the heat exchange efficiency of the heat exchanger. This is not limited herein.

[0101] In a specific embodiment, the flow disturbing part 13 can include a solder layer, and / or the tube wall 12 can include a solder layer, so that the flow disturbing part 13 and the tube wall 12 are welded through the solder layer.

[0102] Specifically, the pipe wall 12 does not include a solder layer, and a solder layer is only provided at the position where the turbulator 13 is connected to the pipe wall 12; alternatively, one side of the pipe wall 12 inside the heat exchange pipe includes a solder layer, and the solder layer can be only provided at the position where the pipe wall 12 is connected to the turbulator 13.

[0103] In another specific embodiment, Figure 10 、 Figure 12 and Figure 14 In the embodiments shown in, the turbulator 13 and the pipe wall 12 can be integrally formed, that is, the turbulator 13 is provided on the heat exchange pipe 1 plate, and only the plate needs to be bent to form the pipe wall 12 and the turbulator 13, without separately providing the turbulator 13, reducing the risk of the turbulator 13 falling off and improving the reliability of the heat exchange pipe.

[0104] Such as Figure 9 and Figure 10 In the embodiments shown in, the cross-section of the turbulator 13 is generally V-shaped, and the three ends of the turbulator 13 are all connected to the pipe wall 12, thus enclosing three flow channels 11. Among them, Figure 9 In the embodiments shown in, the turbulator 13 is fixedly connected to the pipe wall 12, that is, the heat exchange pipe 1 is formed by bending at least two plates, one plate is bent to form the pipe wall 12, and the other plates are bent to form the turbulator 13, and the turbulator 13 is fixedly connected to the pipe wall 12 (such as by welding). Such as Figure 10 In the embodiments shown in, the turbulator 13 and the pipe wall 12 are integrally formed, that is, the heat exchange pipe 1 is formed by bending a single plate, and the turbulator 13 and the pipe wall 12 are formed during the bending process of the plate.

[0105] Such as Figure 11 and Figure 12 In the embodiments shown in, the cross-section of the turbulator 13 is generally S-shaped, and the two ends of the turbulator 13 are connected to the pipe wall 12, thus enclosing two flow channels 11. Among them, such as Figure 11 In the embodiments shown in, the turbulator 13 is fixedly connected to the pipe wall 12, that is, the heat exchange pipe 1 is formed by bending at least two plates, one plate is bent to form the pipe wall 12, and the other plates are bent to form the turbulator 13, and the turbulator 13 is fixedly connected to the pipe wall 12 (such as by welding). Such as Figure 12 In the embodiments shown in, the turbulator 13 and the pipe wall 12 are integrally formed, that is, the heat exchange pipe 1 is formed by bending a single plate, and the turbulator 13 and the pipe wall 12 are formed during the bending process of the plate.

[0106] Such as Figure 13 and Figure 14 In the embodiments shown in, the cross-section of the turbulator 13 is generally wavy, and the two ends of the turbulator 13 are both connected to the pipe wall 12, thus enclosing two flow channels 11. Among them, such as Figure 13In the illustrated embodiment, the spoiler part 13 is fixedly connected to the tube wall 12. That is, the heat exchange tube 1 is formed by bending at least two sheets of plate. One sheet of plate is bent to form the tube wall 12, and the other sheets of plate are bent to form the spoiler part 13, and the spoiler part 13 is fixedly connected to the tube wall 12 (for example, by welding). As Figure 14 In the illustrated embodiment, the spoiler part 13 is integrally formed with the tube wall 12. That is, the heat exchange tube 1 is formed by bending one sheet of plate, and the spoiler part 13 and the tube wall 12 are formed during the bending process of the sheet of plate.

[0107] In other embodiments, the spoiler part 13 can also be of other structures. For example, the cross-section of the spoiler part 13 can be W-shaped, Y-shaped, Z-shaped, etc. The present application does not limit the specific shape of the spoiler part 13.

[0108] Specifically, as Figure 15 shown, Figure 15 is a front view of the heat exchange tube provided by the present application in yet another specific embodiment. In this embodiment, in the sheet of plate that is bent to form the heat exchange tube 1, both sides of the first layer 14 along the thickness direction have a second layer 15, and the second layer 15 includes a solder layer. That is, in the heat exchange tube 1, the tube wall 12 includes the first layer 14 and two second layers 15. The two second layers 15 are located on both sides of the first layer 14 along the thickness direction of the tube wall 12, and both of the two second layers 15 include a solder layer. The solder layer located inside the heat exchange tube 1 is used for welding with the spoiler part 13, and the solder layer located outside the heat exchange tube 1 is used for welding with the fin 2.

[0109] Therefore, in this embodiment, the tube wall 12 has a solder layer inside the heat exchange tube 1, the spoiler part 13 is welded to the tube wall 12 through the solder layer, the tube wall 12 can also have a solder layer outside the heat exchange tube 1, and the fin 2 is welded to the tube wall 12 through the solder layer. The three-layer structure of the tube wall 12 of the heat exchange tube 1 in this embodiment facilitates the welding of the heat exchange tube 1 and the fin 2, and also facilitates the welding of the tube wall 12 of the heat exchange tube 1 and the spoiler part 13.

[0110] It should be noted that the sheet of plate that is bent to form the heat exchange tube 1 can also be a structure with three or more layers, so that the tube wall 12 of the heat exchange tube 1 can be a structure with three or more layers.

[0111] In yet another specific embodiment, as Figure 16 shown, Figure 16This is the front view of the heat exchange tube provided by the present application in another specific embodiment. In this embodiment, the interior of the heat exchange tube 1 includes a first flow disturbing portion 131 and a second flow disturbing portion 132. The first flow disturbing portion 131 is a structure protruding relative to the tube wall 12, and the first flow disturbing portion 131 is integrally formed with the tube wall 12. In a specific embodiment, the second flow disturbing portion 132 is fixedly connected to the tube wall 12. One side of the tube wall 12 inside the heat exchange tube 1 may include a solder layer (not shown in the figure). The second flow disturbing portion 132 and the tube wall 12 are welded through the solder layer. In other embodiments, the second flow disturbing portion 132 may also be integrally formed with the tube wall 12 through a sheet of material. First, structures such as the protrusion of the first flow disturbing portion 131 are made on the sheet of material, and then the sheet of material with the protrusion is curled into the tube wall 12 and the second flow disturbing portion 132 of the heat exchange tube 1.

[0112] In this embodiment, when the first flow disturbing portion 131 and the second flow disturbing portion 132 are arranged inside the heat exchange tube 1, the contact area between the heat exchange tube 1 and the heat exchange medium is increased, thereby further improving the heat exchange efficiency.

[0113] To solve the problem of low heat exchange efficiency of the heat exchanger, the embodiment of the present application also provides a processing method for the heat exchanger. The processing method for the heat exchanger at least includes the following steps:

[0114] Take a sheet of material; wherein, the sheet of material includes at least a first layer 14 and a second layer 15 along the thickness direction, and the second layer 15 includes a solder layer.

[0115] Bend the sheet of material to form a circumferentially unclosed heat exchange tube, as Figures 17 - 20 shown, Figure 17 is a schematic structural diagram of the circumferentially unclosed heat exchange tube in a specific embodiment during the heat exchanger processing; Figure 18 is Figure 17 the front view; Figure 19 is a schematic structural diagram of the circumferentially unclosed heat exchange tube in a specific embodiment during the heat exchanger processing; Figure 20 is Figure 19 the front view. In this embodiment, the circumferentially unclosed heat exchange tube 3 includes a first end 31 and a second end 32, and the first end 31 and the second end 32 are circumferentially spaced apart along the circumferentially unclosed heat exchange tube 3. At the same time, during the process of bending the sheet of material, when the sheet of material includes the first layer 14 and the second layer 15, the sheet of material is bent toward the side of the first layer 14, so that the second layer 15 is located outside the circumferentially unclosed heat exchange tube 3.

[0116] Perform metallurgical bonding on the bent sheet of material to make the circumferentially unclosed heat exchange tube 3 closed along the circumference to form the heat exchange tube 1; that is, connect the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 through metallurgical bonding to form a circumferentially closed heat exchange tube 1.

[0117] Among them, metallurgical bonding means melting the surfaces to be bonded of two objects at high temperature, forming a melt and then cooling and solidifying it to achieve the purpose of bonding. In this embodiment, as Figure 17 and Figure 18 shown, when the circumferentially unclosed heat exchange tube 3 is metallurgically bonded, the first end 31 and / or the second end 32 are melted by high temperature to form a melt. After the melt cools and solidifies, the first end 31 is connected to the second end 32, thereby closing the circumferentially unclosed heat exchange tube 3 along the circumference to form the heat exchange tube 1. The tube wall 12 of the heat exchange tube 1 includes at least a first layer 14 and a second layer 15 in the thickness direction, and the second layer 15 including a solder layer is on the side of the tube wall 12 facing away from the inside of the heat exchange tube 1.

[0118] Take the fin 2, pass the heat exchange tube 1 through the first hole of the fin 2, and fixedly connect the heat exchange tube 1 and the fin 2; in this step, the heat exchange tube 1 and the fin 2 are pre-fixed, thereby restricting the relative movement between the heat exchange tube 1 and the fin 2 and reducing the risk that the relative movement between the two affects the welding reliability during the welding process.

[0119] Weld the fixedly connected heat exchange tube 1 and fin 2. Since the second layer 15 including a solder layer is on the side of the tube wall 12 of the heat exchange tube 1 facing away from the inside of the heat exchange tube 1, the heat exchange tube 1 and the fin 2 are welded through the solder layer.

[0120] Specifically, after the heat exchange tube 1 is inserted into the fin 2, both ends of the heat exchange tube 1 are inserted into the header 4, and after assembly, they are welded together to complete the welding of the heat exchange tube 1 and the fin 2, and the header 4 and the heat exchange tube 1. Optionally, the welding method is brazing.

[0121] Among them, the fin 2 may be provided with a flanging (not shown in the figure) around the circumference of the first hole, which facilitates welding with the heat exchange tube 1 and improves the welding reliability between the two.

[0122] In a specific embodiment, the weld length when the heat exchange tube 1 and the fin 2 are welded can be greater than half of the circumference of the heat exchange tube, thereby improving the welding reliability between the heat exchange tube 1 and the fin 2 and enhancing the heat exchange efficiency.

[0123] In this embodiment, during the processing of the heat exchanger, after the heat exchange tube 1 passes through the first hole of the fin 2, the two are connected by welding. The heat exchange tube and the fin no longer adopt a connection method such as expanding the tube that causes mechanical wear, thereby reducing the risk that the internal structure of the heat exchange tube 1 is damaged and the heat exchange performance on the heat exchange medium side decreases. When the heat exchange tube 1 and the fin 2 are welded, there is no gap or a very small gap between the outer wall of the heat exchange tube 1 and the first hole of the fin 2, thereby reducing the thermal resistance of the heat exchanger and improving the heat exchange efficiency between the gas in the air duct and the heat exchange medium in the flow channel 11 of the heat exchange tube 1, and improving the heat exchange efficiency of the heat exchanger on the air side. In addition, the processing method of the heat exchanger in the embodiment of the present application can also improve the processing efficiency and reduce the processing cost.

[0124] As Figure 17 and Figure 18 shown, the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 in this embodiment are distributed radially, and are metallurgically bonded to form a circumferentially closed heat exchange tube. The tube wall 12 of the heat exchange tube 1 may further be provided with a convex structure, and this convex structure is the turbulence part 13 of the heat exchange tube 1.

[0125] As Figure 19 and Figure 20 shown, the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 in this embodiment are located outside the circumferentially unclosed heat exchange tube 3, and after metallurgical bonding, the first end 31 and the second end 32 are located outside the heat exchange tube 1. This structure facilitates the realization of the metallurgical bonding of the first end 31 and the second end 32, and improves the processing efficiency. In addition, in this embodiment, the tube wall 12 of the heat exchange tube 1 may further be provided with a convex structure, and this convex structure is the turbulence part 13 of the heat exchange tube 1.

[0126] In a specific embodiment, after the step of metallurgically bonding the bent sheet material to make the circumferentially unclosed heat exchange tube 3 circumferentially closed to form the heat exchange tube 1, the processing method may further include the following steps: drawing the circumferentially closed heat exchange tube 1 to form a heat exchange tube 1 with a smaller diameter. Through the drawing operation of this step, the diameter of the heat exchange tube 1 can be reduced, the heat exchange effect is better, and the ratio of refrigerant to weight is increased, which can save refrigerant, thereby improving the heat exchange efficiency, and there is no need to directly bend the sheet material into a circumferentially unclosed heat exchange tube 3 with a smaller diameter, reducing the difficulty of sheet material bending and improving the processing efficiency.

[0127] In a specific embodiment, after metallurgically bonding the bent sheet material, the heat exchange tube 1 may further be cut to have a required length.

[0128] In a specific embodiment, after metallurgically bonding the bent sheet material, the end of the heat exchange tube 1 along the axial direction may further be flared or reduced in diameter to form a structure convenient for connection with the header.

[0129] In a specific embodiment, when metallurgically bonding the bent sheet material to make the sheet material circumferentially closed to form the heat exchange tube, the metallurgical bonding method may specifically be high-frequency welding machine, spin welding seal or pressure processing seal.

[0130] Specifically, high-frequency welding refers to a welding method that utilizes the resistance heat generated by high-frequency current flowing through the contact surfaces of the components to be joined (such as the circumferentially unclosed heat exchange tube 3), so as to join the components to be joined. Among them, the current frequency used in high-frequency welding can be 300 kHz to 450 kHz. For this embodiment, the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 are joined under the action of the resistance heat.

[0131] Spin forming seal means that during the rotation of the components to be joined (such as the circumferentially unclosed heat exchange tube 3) with the mold or the rotation of the spin forming tool around the components to be joined, the spin forming tool feeds relative to the components to be joined, so that the components to be joined are compressed and undergo continuous and point-by-point deformation. For this embodiment, the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 are deformed and combined under the action of the spin forming tool.

[0132] Pressure processing seal is a method of producing metallurgical bonding by causing instantaneous plastic deformation of the components to be joined (such as the circumferentially unclosed heat exchange tube 3) under the action of forging equipment and molds. By controlling the microscopic quality and pressure of the bonding surface, a good bonding effect can be obtained. For this embodiment, the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 undergo plastic deformation and are joined.

[0133] Of course, other metallurgical bonding methods can also be adopted in the embodiments of the present application to form the circumferentially unclosed heat exchange tube 3 into a circumferentially closed heat exchange tube 1, and the present application does not limit the specific metallurgical bonding method.

[0134] In a specific embodiment, before bending the sheet, the processing method of the heat exchanger may further include the following steps: stamping or rolling a protrusion on the surface of the sheet, and the protrusion can be the protrusion described in any of the above embodiments, for example, it can be spiral, threaded, frustum of a cone, hemispherical, etc. During the process of bending the sheet, the sheet is bent toward the side where the protrusion is provided. After the bent sheet is circumferentially closed to form the heat exchange tube 1, the protrusion on the surface of the sheet forms the turbulence part 13. In this embodiment, the turbulence part 13 is integrally formed with the tube wall 12 of the heat exchange tube 1 (integrally formed by stamping or rolling), and the turbulence part 13 in this embodiment can be as Figures 5 - 8 shown in the figure.

[0135] In this embodiment, the method of processing the protrusion on the surface of the sheet-like structure is easy to implement and has high processing efficiency, thus improving the processing efficiency of the heat exchanger and reducing the processing cost. And because in this processing method, the heat exchange tube 1 is formed by curling the sheet, and the heat exchange tube 1 and the fin 2 are connected by welding instead of the expansion tube connection that may cause mechanical wear, various forms of protrusions can be conveniently processed according to actual needs, so as to form the required form of the turbulence part 13 in the heat exchange tube 1 to better improve the heat exchange efficiency of the heat exchanger.

[0136] In another specific embodiment, after bending the sheet to form the circumferentially unclosed 3, the processing method may further include the following steps: internally spinning the bent sheet to form a protrusion, that is, forming a protrusion inside the circumferentially unclosed heat exchange tube 3 by means of internal spinning. In this embodiment, the turbulator 13 and the tube wall 12 of the heat exchange tube 1 are integrally formed (integrally formed by means of internal spinning). The turbulator 13 in this embodiment may be as shown in Figures 5 - 8 the structure shown.

[0137] In yet another specific embodiment, when bending the sheet, a turbulator 13 is also bent and formed inside the sheet. The turbulator may be as shown in Figures 21 - 24 the structure shown. Figure 21 FIG. Figure 22 is a schematic structural diagram of a circumferentially unclosed heat exchange tube in a specific embodiment during the processing of a heat exchanger; Figure 21 is the front view of Figure 23 FIG. Figure 24 is a schematic structural diagram of a circumferentially unclosed heat exchange tube in a specific embodiment during the processing of a heat exchanger; Figure 23 is the front view of

[0138] In a specific embodiment, the sheet may be one piece, and one piece of profile is bent to form the tube wall 12 of the heat exchange tube 1 and the turbulator 13. At this time, the tube wall 12 and the turbulator 13 are integrally formed.

[0139] As in the embodiments shown in Figure 21 and Figure 22 , both the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 are located inside the circumferentially unclosed heat exchange tube 3. After the first end 31 and the second end 32 are metallurgically bonded, a turbulator is formed. The turbulator in this embodiment is a structure that protrudes toward the inside of the heat exchange tube 1 relative to the tube wall of the heat exchange tube 1.

[0140] As in the embodiments shown in Figure 23 and Figure 24 , the sheet is bent multiple times to form a structure with a spiral cross-section. After the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 are metallurgically bonded, a turbulator with a spiral cross-section is formed inside the heat exchange tube 1.

[0141] In other embodiments, the turbulator formed by bending the sheet may also be the structure shown in Figures 9 - 15 . The present application does not limit the shape of the turbulator formed by bending the sheet.

[0142] In another specific embodiment, the sheet may be multiple pieces. One piece of profile is bent to form the tube wall 12, and one or more pieces of profile are bent to form the turbulator 13. At this time, the tube wall 12 and the turbulator 13 are fixedly connected, and the fixed connection method between the two may be welding.

[0143] In each of the above embodiments, the bonding length of the circumferentially closed heat exchange tube 1 is L, and the minimum thickness of the plate is d, where L≥d / 2. Here, the bonding length L is the length along the axial direction of the heat exchange tube 1 at the position of metallurgical bonding. When L≥d / 2, the bonding lengths of the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 are relatively large, and the bonding reliability between the two is relatively high, which can meet the burst pressure requirements of the heat exchanger and reduce the stress concentration at the metallurgical bonding position, thereby improving the reliability and service life of the heat exchange tube 1.

[0144] To solve the problem of relatively low heat exchange efficiency of the heat exchanger, the embodiment of the present application further provides another processing method for the heat exchanger. The processing method of the heat exchanger at least includes the following steps:

[0145] Take a plate; wherein, the plate includes at least a first layer 14 and a second layer 15 along the thickness direction, and the second layer 15 includes a solder layer.

[0146] Bend and pre-fix the plate; wherein, after bending the plate, a circumferentially unclosed heat exchange tube is formed. As Figures 17 - 20 shown, in this embodiment, the circumferentially unclosed heat exchange tube 3 includes a first end 31 and a second end 32, and the first end 31 and the second end 32 are circumferentially spaced apart along the circumferentially unclosed heat exchange tube 3. At the same time, during the process of bending the plate, when the plate includes the first layer 14 and the second layer 15, the plate is bent toward the side of the first layer 14 so that the second layer 15 is located outside the circumferentially unclosed heat exchange tube 3.

[0147] There is a preset gap t between the two ends along the circumference of the pre-fixed plate, and the preset gap t is less than 0.5 mm; the pre-fixation in this embodiment is used to pre-fix the first end 31 and the second end 32 so that the gap t between the two is less than 0.5 mm.

[0148] Take the fin 2, pass the pre-fixed plate through the first hole of the fin 2, and fixedly connect the pre-fixed plate with the fin 2; in this step, when fixedly connecting the pre-fixed circumferentially unclosed heat exchange tube 3 with the fin 2, the relative positions of the two can be restricted, reducing the risk that the relative movement between the two during the welding process affects the welding reliability.

[0149] Weld the pre-fixed plate with the fin 2, and weld the two ends along the circumference of the pre-fixed plate.

[0150] Wherein, the fin 2 can be provided with a flanging (not shown in the figure) around the circumference of the first hole, and the flanging facilitates welding with the pre-fixed plate and improves the welding reliability between the two.

[0151] In a specific embodiment, the weld length when the heat exchange tube 1 and the fin 2 are welded can be greater than half the circumference of the heat exchange tube, thereby improving the welding reliability of the heat exchange tube 1 and the fin 2 and enhancing the heat exchange efficiency.

[0152] In this embodiment, when the preset gap between the first end 31 and the second end 32 of the circumferentially unsealed heat exchange tube 3 after pre-fixation is less than 0.5 mm, during the welding process, the gap between the first end 31 and the second end 32 is small, and the brazing layer enters the preset gap under capillary action, thereby fully filling the preset gap and improving the welding reliability of the first end 31 and the second end 32. In this embodiment, the first end 31 and the second end 32 of the circumferentially unfixed heat exchange tube 3 are welded simultaneously with the welding of the fin 2, thereby eliminating the need for multiple welding operations and improving processing efficiency.

[0153] In addition, when processing the heat exchanger, the heat exchange tube 1 is passed through the first hole of the fin 2 and the two are connected by welding. The heat exchange tube and the fin are no longer connected by a method that may cause mechanical wear, such as expansion tubes, thereby reducing the risk of damage to the internal structure of the heat exchange tube 1 and resulting in a decrease in heat exchange performance on the heat exchange medium side. When the heat exchange tube 1 and the fin 2 are welded, there is no gap or a very small gap between the outer wall of the heat exchange tube 1 and the first hole of the fin 2, thereby reducing the thermal resistance of the heat exchanger, improving the heat exchange efficiency between the gas in the air duct and the heat exchange medium in the circulation channel 11 of the heat exchange tube 1, and improving the heat exchange efficiency of the heat exchanger on the air side. In addition, the processing method of the heat exchanger in the embodiment of the present application can also improve processing efficiency and reduce processing costs.

[0154] Among them, compared with the processing method described above in which the plate is bent and then metallurgically combined to form a heat exchange tube and then welded to the fins, in this embodiment, the circumferentially unclosed heat exchange tube is welded to the fin to be circumferentially closed, which can also save at least one welding step, thereby further improving the processing efficiency of the heat exchanger.

[0155] In the actual production process, after the unsealed heat exchange tube 3 and the fin 2 are pre-fixed, before welding, the two ends of the unsealed heat exchange tube 3 are inserted into the header 4, and then welded together after assembly to complete the circumferential sealing of the circumferentially unsealed heat exchange tube 3, the welding of the heat exchange tube 1 and the fin 2, and the welding of the header 4 and the heat exchange tube 1. Optionally, the welding method is brazing. Figure 17 and Figure 18 As shown, the first end 31 and the second end 32 of the circumferentially unenclosed heat exchange tube 3 in this embodiment are radially distributed, and the first end 31 and the second end 32 are welded to form a circumferentially enclosed heat exchange tube. The tube wall 12 of the heat exchange tube 1 can also be provided with a protrusion structure, which serves as the flow spoiler 13 of the heat exchange tube 1.

[0156] like Figure 19 and Figure 20As shown, the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 in this embodiment are located outside the circumferentially unclosed heat exchange tube 3, and after the first end 31 and the second end 32, the first end 31 and the second end 32 are located outside the heat exchange tube 1. This structure facilitates the welding of the first end 31 and the second end 32 and improves the processing efficiency. Additionally, in this embodiment, the tube wall 12 of the heat exchange tube 1 may further be provided with a convex structure, and this convex structure is the flow disturbing portion 13 of the heat exchange tube 1.

[0157] In a specific embodiment, after bending the sheet into a circumferentially unclosed heat exchange tube 3, the circumferentially unclosed heat exchange tube 3 can also be cut to meet the usage requirements.

[0158] In a specific embodiment, the pre-fixing of the bent sheet can be: pre-fixing the bent sheet through a clamp, that is, sleeving the clamp outside the circumferentially unclosed heat exchange tube 3, so that there is the above-mentioned preset gap t between the first end 31 and the second end 32.

[0159] In another specific embodiment, the pre-fixing of the bent sheet can also be: pre-fixing the bent sheet through pressing, that is, pressing the circumferentially unclosed heat exchange tube 3, so that there is the above-mentioned preset gap t between the first end 31 and the second end 32.

[0160] In yet another specific embodiment, the pre-fixing of the bent sheet can also be: pre-fixing the two circumferential ends of the bent sheet through spot welding, that is, spot welding the first end 31 and the second end 32.

[0161] In yet another specific embodiment, the pre-fixing of the bent sheet can also be: during the bending process of the sheet, pressing and pre-fixing from the inner side of the sheet, that is, applying pressure to the sheet from the inner side during the bending process of the sheet, so that there is the above-mentioned preset gap t between the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 formed after bending.

[0162] Certainly, other pre-fixing methods can also be adopted in the embodiments of the present application, and the present application does not limit this.

[0163] In a specific embodiment, before bending the sheet, the processing method of this heat exchanger may further include the following steps: stamping or rolling a convex on the surface of the sheet, and this convex can be the convex described in any of the above embodiments, for example, it can be spiral, threaded, frustum of a cone, hemispherical, etc. During the bending process of the sheet, the sheet is bent towards the side where the convex is provided. After the bent sheet is circumferentially closed to form the heat exchange tube 1, the convex on the surface of the sheet forms the flow disturbing portion 13. In this embodiment, this flow disturbing portion 13 is integrally formed with the tube wall 12 of the heat exchange tube 1 (integrally formed by stamping or rolling), and the flow disturbing portion 13 in this embodiment can be such asFigures 5 - 8 The structure shown.

[0164] In this embodiment, the method of processing the protrusions on the surface of the plate-shaped structure is easy to implement, and the processing efficiency is relatively high, thereby improving the processing efficiency of the heat exchanger and reducing the processing cost. Moreover, this processing method can conveniently process various forms of protrusions according to actual needs, so as to form the turbulence part 13 with the required form in the heat exchange tube 1, thereby improving the heat exchange efficiency of the heat exchanger.

[0165] In another specific embodiment, after bending the plate to form the circumferentially unclosed heat exchange tube 3, the processing method may further include the following steps: internally spinning the bent plate to form protrusions, that is, forming protrusions inside the circumferentially unclosed heat exchange tube 3 by means of internal spinning. In this embodiment, the turbulence part 13 and the tube wall 12 of the heat exchange tube 1 are integrally formed (integrally formed by means of internal spinning). The turbulence part 13 in this embodiment can be as Figures 5 - 8 The structure shown.

[0166] In still another specific embodiment, when bending the plate, the turbulence part 13 is also bent and formed inside the plate, and the turbulence part can be as Figures 21 - 24 The structure shown.

[0167] In one specific embodiment, the plate can be one piece, and one piece of profile is bent to form the tube wall 12 and the turbulence part 13 of the heat exchange tube 1. At this time, the tube wall 12 and the turbulence part 13 are integrally formed.

[0168] Such as Figure 21 And Figure 22 In the embodiments shown, both the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 are located inside the circumferentially unclosed heat exchange tube 3, and after the first end 31 and the second end 32 are welded, a turbulence part is formed. The turbulence part in this embodiment is a structure protruding towards the inside of the heat exchange tube 1 relative to the tube wall of the heat exchange tube 1.

[0169] Such as Figure 23 And Figure 24 In the embodiments shown, the plate is bent multiple times to form a structure with a spiral cross-section. After the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 are welded, a turbulence part with a spiral cross-section is formed inside the heat exchange tube 1.

[0170] In other embodiments, the turbulence part formed by bending the plate can also be as Figures 9 - 15 The structure shown. The present application does not limit the shape of the turbulence part formed by bending the plate.

[0171] In another specific embodiment, the plate material can be multiple pieces. One profile is bent to form the pipe wall 12, and one or more profiles are bent to form the flow disturbing part 13. At this time, the pipe wall 12 and the flow disturbing part 13 are fixedly connected, and the fixed connection manner between the two can be welding.

[0172] In each of the above embodiments, the combined length of the circumferentially closed heat exchange tube 1 is L, and the minimum thickness of the plate material is d, where L≥d / 2. Here, the combined length L is the length of the welding position along the axial direction of the heat exchange tube 1. When L≥d / 2, the combined lengths of the first end 31 and the second end 32 of the circumferentially unclosed heat exchange tube 3 are relatively large, and the connection reliability between the two is relatively high, which can meet the bursting pressure requirement of the heat exchanger and reduce the stress concentration at the welding position, thereby improving the reliability and service life of the heat exchange tube 1.

[0173] In addition, in each of the above embodiments, after the heat exchange tube 1 and the fin 2 are welded, the heat exchanger can also be bent.

[0174] In one specific embodiment, the heat exchanger described in each of the above embodiments can be processed by the processing method of the heat exchanger described above.

[0175] The above description is only the specific implementation manners of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of the present application should be covered within the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application should be subject to the protection scope of the claims.

Claims

1. A heat exchanger, characterized in that, Comprising: Fins, the fins including a first hole; A heat exchange tube, the heat exchange tube including a tube wall and a turbulator, the turbulator being located inside the heat exchange tube; The heat exchange tube penetrates through the first hole and is connected to the fins; The heat exchange tube further includes at least one flow channel, and the wall enclosing the flow channel includes at least part of the tube wall and at least part of the turbulator; The tube wall includes a first layer and a second layer, the second layer including a solder layer, and along the thickness direction of the tube wall, at least one side of the first layer is connected to the second layer.

2. The heat exchanger according to claim 1, wherein There is one flow channel, and the turbulator is integrally formed with the tube wall.

3. The heat exchanger according to claim 1, wherein There are at least two flow channels, the turbulator is integrally formed with the tube wall, or the turbulator is fixedly connected to the tube wall.

4. The heat exchanger according to claim 3, wherein, The tube wall has the solder layer inside the heat exchange tube, and / or the turbulator has the solder layer inside the heat exchange tube, and the turbulator is connected to the tube wall through the solder layer.

5. The heat exchanger according to any one of claims 2-4, characterized in that, The tube wall and / or the turbulator have a raised structure, and the raised structure is located inside the heat exchange tube.

6. The heat exchanger according to claim 1, characterized in that, The turbulator is a protrusion on the tube wall, and the height of the protrusion is less than or equal to 1 / 2 of the diameter of the heat exchange tube.

7. A processing method of a heat exchanger, characterized in that, The processing method of the heat exchanger includes: Taking a sheet; Bending the sheet; Performing metallurgical bonding on the bent sheet to form a circumferentially closed heat exchange tube; Taking fins, passing the heat exchange tube through the first hole of the fins, and fixedly connecting the heat exchange tube to the fins; Welding the fixedly connected heat exchange tube and fins.

8. The processing method of the heat exchanger according to claim 7, characterized in that, When performing metallurgical bonding on the bent sheet to form a circumferentially closed heat exchange tube, the processing method includes: High-frequency welding the bent sheet, or spin-sealing the bent sheet, or pressure-processing and sealing the bent sheet.

9. A processing method of a heat exchanger, characterized in that, The processing method of the heat exchanger includes: Taking a sheet; Bending and pre-fixing the sheet; There is a preset gap t between the two circumferential ends of the pre-fixed sheet, and the preset gap t is less than 0.5 mm; Taking fins, passing the pre-fixed sheet through the first hole of the fins, and fixedly connecting the pre-fixed sheet to the fins; Welding the pre-fixed sheet to the fins, and welding the two circumferential ends of the pre-fixed sheet.

10. The processing method of the heat exchanger according to claim 9, characterized in that, When pre-fixing the bent sheet, the processing method includes: Pre-fixing the bent sheet by a clamp, or pre-fixing the bent sheet by pressing, or pre-fixing the two circumferential ends of the bent sheet by spot welding, or pressing and pre-fixing from the inner side of the sheet during the bending process of the sheet.

11. The processing method of the heat exchanger according to any one of claims 7-10, characterized in that, Before bending the sheet, the processing method further includes: stamping or rolling a raised structure on the surface of the sheet; or After bending the sheet, the processing method further includes: internally spin-forming a raised structure on the bent sheet.

12. The processing method of the heat exchanger according to any one of claims 7-10, characterized in that, When bending the sheet, a turbulator is formed inside the sheet.

13. The processing method of the heat exchanger according to any one of claims 7-10, characterized in that, The bonding length of the circumferentially closed heat exchange tube is L, and the minimum thickness of the sheet is d, L≥d / 2.

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