Heat exchanger and manufacturing method thereof

Abstract

The invention provides a heat exchanger and a manufacturing method thereof, and belongs to the technical field of heat exchange. The heat exchanger comprises a first flow collecting pipe, a second flow collecting pipe, a heat exchange pipe assembly and a fin assembly, the heat exchange pipe assembly comprises a plurality of heat exchange flat pipes, the two ends of each heat exchange flat pipe communicate with the first flow collecting pipe and the second flow collecting pipe correspondingly, each heat exchange flat pipe comprises at least two straight sections and at least one bent section, and the two straight sections and the at least one bent section are arranged in parallel. The fin assembly comprises a plurality of first fins, a plurality of positioning structures and a plurality of second fins, each first fin is arranged between the straight sections of the two adjacent heat exchange flat pipes in the length direction of the first collecting pipe, and each second fin is arranged between the straight sections of the two adjacent heat exchange flat pipes in the length direction of the first collecting pipe. The first side of each second fin is connected with the corresponding positioning structure, and the second side of each second fin is spaced from the nearest bent section. The heat exchange efficiency of the heat exchanger can be improved, and the damage probability of the heat exchange flat pipes during bending can be reduced.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of heat exchange, and particularly relates to a heat exchanger and a manufacturing method thereof. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. Heat exchangers are widely used in various refrigeration systems because of their good heat exchange performance.

[0003] The heat exchanger includes fins and a plurality of flat heat exchange tubes. The plurality of flat heat exchange tubes are arranged at intervals, and the fins are arranged between two adjacent flat heat exchange tubes. In order to improve the heat exchange performance of the heat exchanger, the flat heat exchange tubes are bent from the middle, and the bent heat exchanger has a structure of two or more rows.

[0004] However, in order to reduce the difficulty of bending and prevent the fins from pulling the two adjacent flat heat exchange tubes during bending, resulting in damage to the flat heat exchange tubes, fins are generally not provided at the bent sections of the heat exchanger with a structure of two or more rows. This makes the bent sections of the flat heat exchange tubes not surrounded by fins and easily damaged. Moreover, due to the absence of fins at the bent sections, the heat exchange efficiency of the heat exchanger is also reduced. Summary of the Invention

[0005] Embodiments of the present disclosure provide a heat exchanger and a manufacturing method thereof, which can improve the heat exchange efficiency of the heat exchanger and reduce the damage probability of the flat heat exchange tubes at the bent sections. The technical solutions are as follows:

[0006] Embodiments of the present disclosure provide a heat exchanger, which includes a first header, a second header, a heat exchange tube assembly, and a fin assembly; the heat exchange tube assembly includes a plurality of flat heat exchange tubes arranged in a stacked manner, the plurality of flat heat exchange tubes are arranged at intervals along the length direction of the first header, and both ends of each flat heat exchange tube in the plurality of flat heat exchange tubes are respectively communicated with the first header and the second header. Each flat heat exchange tube includes at least two straight sections and at least one bent section along its own length direction, and each two adjacent straight sections are connected by one bent section; the fin assembly includes a plurality of first fins, a plurality of positioning structures, and a plurality of second fins. Each first fin in the plurality of first fins is arranged between the straight sections of two adjacent flat heat exchange tubes, and the first fin is respectively connected to the two adjacent straight sections. The plurality of positioning structures correspond to the bent sections of all the flat heat exchange tubes one by one, each positioning structure in the plurality of positioning structures is sleeved outside the corresponding bent section, the plurality of second fins correspond to the plurality of positioning structures one by one, and along the length direction of the first header, each second fin has a first side and a second side arranged oppositely. The first side of the second fin is connected to the corresponding positioning structure, and the second side of the second fin is spaced from the nearest bent section.

[0007] In yet another implementation of the present disclosure, the positioning structure includes a first positioning piece. Along the length direction of the first current collector tube, the first positioning piece has a first connection surface and the second connection surface arranged oppositely. Both the first connection surface and the second connection surface face the heat exchange flat tube. The first connection surface is connected to the second fin corresponding to the positioning structure, and the second connection surface is connected to the bent section corresponding to the positioning structure. Along the width direction of the heat exchange flat tube, one side edge of the first positioning piece is bent towards the second connection surface to form a first positioning groove for clamping the bent section corresponding to the positioning structure.

[0008] In yet another implementation of the present disclosure, along the length direction of the heat exchange flat tube, the second fin includes a plurality of sequentially arranged V-shaped structures. The positioning structure further includes a plurality of positioning strips. The plurality of positioning strips are arranged at intervals along the length direction of the heat exchange flat tube on the first connection surface, and the length direction of each positioning strip in the plurality of positioning strips is the width direction of the heat exchange flat tube. Each positioning strip is connected to the narrower end of the V-shaped structure corresponding to the positioning structure.

[0009] In yet another implementation of the present disclosure, along the length direction of the heat exchange flat tube, the second fin includes a plurality of sequentially arranged V-shaped structures. The positioning structure includes a third positioning piece and a plurality of third positioning ribs. The third positioning piece has a first connection surface and the second connection surface arranged oppositely. The second connection surface is connected to the heat exchange flat tube. Along the width direction of the heat exchange flat tube, one side edge of the third positioning piece is bent towards the second connection surface to form a second positioning groove. The plurality of third positioning ribs are arranged at intervals along the length direction of the heat exchange flat tube and are all parallel to the second connection surface. The length direction of each third positioning rib in the plurality of third positioning ribs is the width direction of the heat exchange flat tube. One end of each third positioning rib is connected to the groove wall of the second positioning groove, and each third positioning rib is connected to the narrower end of the V-shaped structure corresponding to the positioning structure.

[0010] In yet another implementation of the present disclosure, the positioning structure includes a first positioning piece and a second positioning piece. Along the length direction of the first manifold, the first positioning piece has a first connection surface and the second connection surface arranged oppositely, and both the first connection surface and the second connection surface are perpendicular to the axis of the first manifold. Along the width direction of the flat heat exchange tube, one side edge of the first positioning piece is bent towards the second connection surface to form a third positioning groove for clamping the corresponding bent section of the positioning structure; the second positioning piece is parallel to the second connection surface and is connected to the groove wall of the third positioning groove, the second positioning piece is connected to the corresponding second fin of the positioning structure, and the side of the second positioning piece facing the second connection surface and the second connection surface are respectively connected to the corresponding bent section of the positioning structure.

[0011] In yet another implementation of the present disclosure, along the width direction of the flat heat exchange tube, the second positioning piece has a first side edge and a second side edge arranged oppositely, and the first side edge of the second positioning piece is connected to the first positioning piece; the corresponding second fin of the positioning structure is located at the second side edge of the second positioning piece, and the positioning structure and the corresponding second fin are an integral structural member.

[0012] In yet another implementation of the present disclosure, the second fin includes a plurality of second sub-fins, the plurality of second sub-fins are arranged in sequence along the length direction of the flat heat exchange tube, and adjacent two of the second sub-fins are inclined in different directions relative to the connected positioning structure.

[0013] In yet another implementation of the present disclosure, the second fin includes a plurality of second sub-fins, the plurality of second sub-fins are divided into a plurality of sub-fin units along the width direction of the flat heat exchange tube, and each sub-fin unit includes a plurality of the second sub-fins arranged at intervals along the length direction of the flat heat exchange tube; in the same sub-fin unit, adjacent two of the second sub-fins are inclined in different directions relative to the connected positioning structure, and all the second sub-fins in the same sub-fin unit have the same inclination direction.

[0014] In yet another implementation of the present disclosure, along the length direction of the bent section and from the edge of the bent section to the middle of the bent section, the length of the second sub-fin gradually decreases.

[0015] In yet another implementation of the present disclosure, a method for manufacturing a heat exchanger is further provided. The manufacturing method is used to manufacture the heat exchanger described above. The manufacturing method includes: connecting the heat exchange tube assembly to the first header and the second header respectively to form a flat heat exchanger; arranging a first fin between the straight sections of two adjacent heat exchange flat tubes in the flat heat exchanger, such that the first fin is respectively connected to the straight sections of the two adjacent heat exchange flat tubes; installing the second fin at the bending reserved area of each heat exchange flat tube through the positioning structure, such that the first side of each second fin in the length direction of the first header is connected to the corresponding positioning structure, and the second side of the second fin is spaced from the nearest bending section; bending the bending reserved area of each heat exchange flat tube, such that the pre-bending area of each heat exchange flat tube forms a bending section.

[0016] The beneficial effects brought by the technical solution provided in the embodiments of the present disclosure are:

[0017] Since in the heat exchanger provided by the present disclosure, the fin assembly further includes a positioning structure and second fins arranged in one-to-one correspondence with the positioning structure, and moreover, the positioning structure corresponds to the bending sections of all the heat exchange flat tubes one by one, and the positioning structure is sleeved outside the corresponding bending sections. In this way, the positioning structure can be sleeved outside the bending section of each heat exchange flat tube, so as to protect the bending section through the positioning structure and avoid the bending section of the heat exchange flat tube being directly exposed outside, thereby reducing the possibility of its damage.

[0018] Moreover, since the second fins correspond to the positioning structure one by one, and along the length direction of the first header, the first side of each second fin is connected to the corresponding positioning structure, and the second side is spaced from the nearest bending section. In this way, after connecting the second fins to the positioning structure, second fins can be arranged in the bending section of each heat exchange flat tube, thereby increasing the heat exchange efficiency through the second fins. Moreover, the presence of the second fins can further protect the bending section and further reduce the possibility of damage to the bending section. And since the other end of the second fin is spaced from the nearest bending section, when the heat exchange flat tube is bent, it can be avoided that it is difficult to bend because both ends of the fin are connected to the heat exchange flat tube, and it can also be avoided that the fin pulls the heat exchange flat tube, resulting in deformation and damage of the heat exchange flat tube. That is to say, by spacing the second fin from the nearest heat exchange flat tube, the difficulty of bending the heat exchange flat tube can be reduced, and at the same time, the possibility of damage to the heat exchange flat tube during the bending process can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of a heat exchange flat tube of a heat exchanger in the related art when it is not bent;

[0021] Figure 2 is Figure 1 a schematic structural diagram of the heat exchange flat tube of the heat exchanger in after being bent;

[0022] Figure 3 is a schematic structural diagram of a heat exchanger provided by an embodiment of the present disclosure when it is not bent;

[0023] Figure 4 is Figure 3 a partial enlarged view of the top in ;

[0024] Figure 5 is a schematic connection structure diagram of a positioning structure and a corresponding second fin;

[0025] Figure 6 is Figure 5 a schematic structural diagram of a positioning structure in ;

[0026] Figure 7 is Figure 4 a schematic structural diagram of a positioning structure in ;

[0027] Figure 8 is Figure 7 a schematic connection structure diagram of the positioning structure and the second fin in ;

[0028] Figure 9 is a schematic structural diagram of another heat exchanger provided by an embodiment of the present disclosure when it is not bent;

[0029] Figure 10 is Figure 9 a partial enlarged view of the top in ;

[0030] Figure 11 is Figure 10 a schematic connection structure diagram of one of the positioning structures and the corresponding second fin in .

[0031] The meanings of the symbols in the figure are as follows:

[0032] 1. First header;

[0033] 2. Second header;

[0034] 3. Heat exchange tube assembly; 31. Flat heat exchange tube; 311. Straight section; 312. Bent section;

[0035] 4. Fin assembly; 41. First fin; 411. First sub-fin; 42. Positioning structure; 4210. First positioning groove; 421. First positioning piece; 4211. First connecting surface; 4212. Second connecting surface; 422. Positioning bar; 423. Second positioning piece; 43. Second fin; 431. Second sub-fin; 4203. Third positioning piece; 420. Second positioning groove; 4205. Third positioning rib; 4200. Third positioning groove. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0037] To improve the heat exchange efficiency of the heat exchanger, the flat heat exchange tube of the heat exchanger is usually bent from a horizontal state to a bent state. For example, the flat heat exchange tube of the heat exchanger is bent from the Figure 1 horizontal state in Figure 2 to the Figure 2 bent state in. Among them, the heat exchanger in

[0038] Figure 3 is a multi-row heat exchanger. Figure 3 The first header 1 and the second header 2 are parallel to each other.

[0039] The heat exchange tube assembly 3 includes a plurality of flat heat exchange tubes 31 that are parallel to each other. The plurality of flat heat exchange tubes 31 are arranged at intervals along the length direction of the first header 1, and both ends of each flat heat exchange tube 31 in the plurality of flat heat exchange tubes 31 are respectively communicated with the first header 1 and the second header 2. Each flat heat exchange tube 31 includes at least two straight sections 311 and at least one bent section 312 along its own length direction, and one bent section 312 is connected between every two adjacent straight sections 311.

[0040] Figure 4 For Figure 3 the partial enlarged view at the top in, in combination with Figure 4, the fin assembly 4 includes a plurality of first fins 41, a plurality of positioning structures 42, and a plurality of second fins 43. Along the length direction of the first header 1, each of the plurality of first fins 41 is disposed between the straight sections 311 of two adjacent heat exchange flat tubes 31, and both ends of the first fin 41 are respectively connected to the two adjacent straight sections 311. The plurality of positioning structures 42 correspond one-to-one to the bent sections 312 of all the heat exchange flat tubes 31. Each of the plurality of positioning structures 42 is sleeved outside the corresponding bent section 312. The plurality of second fins 43 correspond one-to-one to the plurality of positioning structures 42, and along the length direction of the first header 1, each second fin 43 has a first side and a second side arranged oppositely. The first side of the second fin 43 is connected to the corresponding positioning structure 42, and the second side of the second fin 43 is spaced from the nearest bent section 312.

[0041] In the heat exchanger provided by the present disclosure, the fin assembly 4 further includes positioning structures 42 and second fins 43 arranged in one-to-one correspondence with the positioning structures 42. Moreover, the positioning structures 42 correspond one-to-one to the bent sections 312 of all the heat exchange flat tubes 31, and each positioning structure 42 is sleeved outside the corresponding bent section 312. In this way, the positioning structure 42 can be sleeved outside the bent section 312 of each heat exchange flat tube 31, so as to protect the bent section 312 through the positioning structure 42 and avoid the bent section 312 of the heat exchange flat tube 31 being directly exposed outside to reduce the possibility of its damage.

[0042] Moreover, since the second fins 43 correspond one-to-one to the positioning structures 42, and along the length direction of the first header 1, the first side of each second fin 43 is connected to the corresponding positioning structure 42, and the second side is spaced from the nearest bent section 312. In this way, after connecting the second fins 43 to the positioning structures 42, the second fins 43 can be arranged in the bent sections 312 of each heat exchange flat tube 31, thereby increasing the heat exchange efficiency through the second fins 43. Moreover, the presence of the second fins 43 can further protect the bent sections 312 and further reduce the possibility of damage to the bent sections 312. And since the other end of the second fin 43 is spaced from the nearest bent section 312, when the heat exchange flat tube 31 is bent, it can be avoided that it is difficult to bend because both ends of the fin are connected to the heat exchange flat tube, and it can also be avoided that the fin pulls the heat exchange flat tube 31 to cause deformation and damage to the heat exchange flat tube 31. That is to say, by spacing the second fin 43 from the nearest heat exchange flat tube 31, the difficulty of bending the heat exchange flat tube 31 can be reduced, and at the same time, the possibility of damage to the heat exchange flat tube 31 during the bending process can be reduced.

[0043] Optionally, two adjacent straight sections 311 are arranged in parallel or form an included angle.

[0044] In the above implementation, the bending condition of the heat exchange flat tube 31 can be set according to actual requirements. For example, if an angle is formed between two adjacent straight sections 311 after bending, a multi-row heat exchanger can be formed in this way. If two adjacent straight sections 311 are arranged in parallel after bending, a stacked double-layer heat exchanger can be formed in this way.

[0045] In the embodiment of the present disclosure, the heat exchanger is a multi-row heat exchanger. That is, an angle not greater than 90 degrees is formed between two adjacent straight sections 311.

[0046] In the embodiment of the present disclosure, the form of the positioning structure 42 can be in various forms, as long as it can be sleeved outside the bent section 312 to protect the bent section 312 and can be connected to the second fin 43 at the same time. The present disclosure does not limit this.

[0047] In the embodiment of the present disclosure, three structures are listed to further illustrate the positioning structure 42.

[0048] (1) When the structure of the positioning structure 42 is the first structure:

[0049] Figure 5 It is a schematic diagram of the connection structure between a positioning structure and the corresponding second fin. Combining Figure 5 , optionally, the positioning structure 42 includes a first positioning piece 421. Along the length direction of the first header 1, the first positioning piece 421 has a first connection surface 4211 and a second connection surface 4212 arranged oppositely. Both the first connection surface 4211 and the second connection surface 4212 are perpendicular to the axis of the first header 1. The first connection surface 4211 is connected to the second fin 43 corresponding to the positioning structure 42, and the second connection surface 4212 is connected to the bent section 312 corresponding to the positioning structure 42.

[0050] Along the width direction of the heat exchange flat tube 31, one side edge of the first positioning piece 421 is bent towards the second connection surface 4212 to form a first positioning groove 4210 for clamping and positioning the corresponding bent section 312 of the positioning structure 42.

[0051] In the above implementation, the first positioning groove 4210 is used for the side flat fitting of the bent section 312 to facilitate the first positioning piece 421 to be sleeved outside the corresponding bent section 312. By respectively setting the first connection surface and the second connection surface in the first positioning piece 421, the first connection surface 4211 can be connected to the second fin 43 corresponding to the first positioning piece 421, and at the same time, the second connection surface 4212 can be connected to the corresponding bent section 312, thereby realizing the installation of the positioning structure 42 and the second fin 43 at the bent section 312.

[0052] Optionally, after the first positioning piece 421 is sleeved outside the bent section 312, the connection between the first positioning piece 421 and the bent section 312 can be achieved by welding. The second fin 43 can also be connected to the first positioning piece 421 by welding.

[0053] In other examples, the second fin 43 and the first positioning piece 421 may also be an integral structural member.

[0054] In the embodiments of the present disclosure, in order to improve the fitting degree between the first positioning piece 421 and the bent section 312, the shape of the first positioning groove 4210 is the same as the shape corresponding to the contour of the side wall of the bent section 312. For example, when the side wall of the bent section 312 is arc-shaped, correspondingly, the first positioning groove 4210 is an arc-shaped groove.

[0055] Optionally, along the length direction of the heat exchange flat tube 31, the second fin 43 includes a plurality of V-shaped structures connected or arranged in sequence.

[0056] Figure 6 For Figure 5 a schematic structural diagram of a positioning structure, combined with Figure 6 , the positioning structure 42 further includes a plurality of positioning bars 422. The plurality of positioning bars 422 are arranged at intervals along the length direction of the heat exchange flat tube 31 on the first connection surface, and the length direction of each positioning bar 422 in the plurality of positioning bars 422 is the width direction of the heat exchange flat tube 31. Each positioning bar 422 is connected to the narrower end of the V-shaped structure corresponding to the positioning structure 42.

[0057] In the above implementation manner, the second fin 43 is arranged as a plurality of V-shaped structures connected in sequence, so that the air flow can be accelerated through the hollow part of the V shape, thereby improving the heat exchange efficiency.

[0058] By providing the positioning bars 422, the installation and arrangement of the second fin 43 can be positioned by the positioning bars 422, so as to reduce the installation difficulty of the second fin 43 at the bent section 312.

[0059] In the embodiments of the present disclosure, when the second fin 43 includes a plurality of V-shaped structures connected in sequence, the structure of the second fin 43 is the same as that of the first fin 41, and both include a plurality of first sub-fins 411. Each continuous two first sub-fins 411 are connected to form a V-shaped structure. After a plurality of V-shaped structures are connected in sequence, the second fin 43 can be formed.

[0060] Along the length direction of the first header pipe 1, each first sub-fin 411 forms a projection in the bending section 312. Assume that the length of each projection in the length direction of the flat heat exchange pipe 31 is l, and the length of the bending reserved area of each flat heat exchange pipe 31 is W. Then the installation quantity n of the first sub-fins 411 satisfies: n ≤ W / l. And along the length direction of the first header pipe 1, the height H of the first sub-fins 411 < the pipe pitch of the flat heat exchange pipes 31.

[0061] The above-mentioned first sub-fins 411 can be fins with windows or fins in other forms, and the present disclosure does not limit this.

[0062] (2) When the positioning structure 42 is the second structure:

[0063] Figure 7 is Figure 4 a schematic structural diagram of a positioning structure, Figure 8 is Figure 7 a schematic connection structure diagram of the positioning structure in Figure 7 and Figure 8 , the positioning structure 42 includes a third positioning piece 4203. The third positioning piece 4203 has a first connection surface 4211 and a second connection surface 4212 which are oppositely arranged. Both the first connection surface 4211 and the second connection surface 4212 are perpendicular to the axis of the first header pipe 1, and the second connection surface 4212 is connected to the flat heat exchange pipe 31.

[0064] Along the width direction of the flat heat exchange pipe 31, one side edge of the third positioning piece 4203 bends towards the second connection surface 4212 to form a second positioning groove 420 for clamping the flat heat exchange pipe 31.

[0065] The positioning structure 42 further includes a plurality of third positioning ribs 4205. The plurality of third positioning ribs 4205 are arranged at intervals along the length direction of the flat heat exchange pipe 31 and are both spaced from the second connection surface 4212. The length direction of each third positioning rib 4205 among the plurality of third positioning ribs 4205 is the width direction of the flat heat exchange pipe 31, and one end of each third positioning rib 4205 is connected to the groove wall of the second positioning groove 420. Each third positioning rib 4205 is connected to the narrower end of the V-shaped structure corresponding to the positioning structure 42.

[0066] In the above implementation manner, the third positioning ribs 4205 are used to position the installation and arrangement of the second fins 43, so as to reduce the installation difficulty of the second fins 43. Moreover, the third positioning ribs 4205 are arranged to be spaced from the second connection surface 4212, so that the third positioning ribs 4205 can be in direct contact with the flat heat exchange pipe 31, so that there is no obstacle between the second fins 43 and the flat heat exchange pipe 31, and the heat exchange efficiency is further improved.

[0067] The shape of the second positioning groove 420 is consistent with the shape corresponding to the contour of the side wall of the bent section 312. For example, when the side wall of the bent section 312 is arc-shaped, correspondingly, the second positioning groove 420 is an arc-shaped groove.

[0068] Optionally, the second fin 43 can also be an integral structural member with the third positioning rib 4205.

[0069] In other examples, the third positioning rib 4205 and the second fin 43 can also be connected by welding.

[0070] (3) When the positioning structure 42 is the third structure:

[0071] Figure 9 This is a schematic structural diagram of another heat exchanger provided by the present disclosure when it is not bent. Figure 10 For Figure 9 a partial enlarged view of the top in Figure 11 For Figure 10 a connection structural diagram of one of the positioning structures and the corresponding second fin in Figure 9 , Figure 10 and Figure 11 , optionally, the positioning structure 42 includes a first positioning piece 421 and a second positioning piece 423. Along the length direction of the first header 1, the first positioning piece 421 has a first connection surface 4211 and a second connection surface 4212 arranged oppositely, and both the first connection surface 4211 and the second connection surface 4212 are perpendicular to the axis of the first header 1. Along the width direction of the heat exchange flat tube 31, one side edge of the first positioning piece 421 is bent toward the second connection surface 4212 to form a third positioning groove 4200 for clamping the corresponding bent section 312 of the positioning structure 42.

[0072] The second positioning piece 423 is parallel to the second connection surface 4212 and is connected to the groove wall of the third positioning groove 4200. The second positioning piece 423 is connected to the second fin 43 corresponding to the positioning structure 42. The side of the second positioning piece 423 facing the second connection surface 4212 and the second connection surface 4212 are respectively connected to the corresponding bent section 312 of the positioning structure 42.

[0073] In the above implementation manner, by setting the positioning structure 42 to the above structure, the second fin 43 can also be installed in the bent section 312 through the positioning structure 42 to further improve the heat exchange efficiency, and at the same time, the bent section 312 can be protected by the positioning structure 42.

[0074] The shape of the third positioning groove 4200 is consistent with the shape corresponding to the contour of the side wall of the bent section 312. For example, when the side wall of the bent section 312 is arc-shaped, correspondingly, the third positioning groove 4200 is an arc-shaped groove.

[0075] Optionally, along the width direction of the flat heat exchange tube 31, the second positioning piece 423 has a first side and a second side which are oppositely arranged, and the first side of the second positioning piece 423 is connected to the first positioning piece 421. The second fin 43 corresponding to the positioning structure 42 is located at the second side of the second positioning piece 423, and the positioning structure 42 and the corresponding second fin 43 are an integral structural member.

[0076] In the above implementation manner, setting the positioning structure 42 and the second fin 43 as an integral structure can further simplify the installation of the second fin 43. As long as the positioning structure 42 is sleeved outside the bending reserved area corresponding to the bending section 312 when not bent, and then the positioning structure 42 is welded to the flat heat exchange tube 31, the installation of the positioning structure 42 and the second fin 43 can be completed, greatly simplifying the working procedure.

[0077] Because after setting the positioning structure 42 and the second fin 43 as an integral structure, only a planar metal plate can correspondingly obtain the positioning structure and the second fin 43. At this time, the planar metal plate is bent to form two opposite planes. Then one of the planes is bent again along the direction away from the other plane to obtain a vertical plane perpendicular to the original plane, and this vertical plane can be the fin. That is to say, in the obtained positioning structure 42, along the width direction of the flat heat exchange tube 31, the length of the second positioning piece 423 is less than the width of the connected bending section 312, and the length of the second positioning piece 423 is also less than the length of the first positioning piece 421. The second fin 43 is located on the side of the second positioning piece 423 away from the third positioning groove 4200. In this way, the bending section 312 can be wrapped by the first positioning piece 421 to protect the bending section 312. And setting the length of the second positioning piece 423 to be less than the width of the bending section 312 can make the second fin 43 conveniently arranged in the middle of the bending section 312.

[0078] Optionally, the second fin 43 can have a different structure from the first fin 41. The second fin 43 includes a plurality of second sub-fins 431, and the plurality of second sub-fins 431 are arranged in sequence along the length direction of the flat heat exchange tube 31, and two adjacent second sub-fins 431 are inclined in different directions relative to the connected positioning structure 42.

[0079] In the above implementation manner, setting the second fin 43 as a plurality of second sub-fins 431, and two adjacent second sub-fins 431 are inclined in different directions relative to the connected positioning structure 42, so that the second sub-fins 431 are arranged in a staggered manner, and further enables the second fin 43 to contact air flows in different directions, thereby further improving the heat exchange efficiency.

[0080] That is to say, among two adjacent second sub-fin 431s, in the width direction of the flat heat exchange tube 31, if one second sub-fin 431 inclines to the left, the other second sub-fin 431 may incline to the right.

[0081] Optionally, along the length direction of the first header 1, the projection of the connection position between the second fin 43 and the corresponding positioning structure 42 in the bending section 312 is located in the middle of the bending section 312. This can make the second fin 43 located in the middle of the bending section 312, thereby further improving the heat exchange efficiency.

[0082] In other examples, the arrangement of the second fin 43 can also be in other forms.

[0083] In order to further improve the heat exchange efficiency, the second fin 43 can also be provided with more than one layer. At this time, the structure of the second fin 43 can be:

[0084] The second fin 43 includes a plurality of second sub-fins 431. The plurality of second sub-fins 431 are divided into a plurality of sub-fin units along the width direction of the flat heat exchange tube. Each sub-fin unit includes a plurality of second sub-fins 431 arranged at intervals along the length direction of the flat heat exchange tube.

[0085] In the same sub-fin unit, two adjacent second sub-fins 431 respectively incline in different directions relative to the connected positioning structure 42, and the inclination directions of all the second sub-fins 431 in the same sub-fin unit are the same.

[0086] In the above implementation manner, by setting the second fin 43 as multiple layers of second sub-fins 431, the heat exchange efficiency can be further improved.

[0087] The second sub-fin 431 can be a planar metal plate member, or can also be a metal plate member with an uneven plate surface, etc.

[0088] Optionally, in the length direction of the bending section 312 and from the edge of the bending section 312 to the middle of the bending section 312, the length of the second sub-fin 431 gradually decreases.

[0089] In the above implementation manner, by setting the second sub-fin 431 as the above structure, it is easier to bend the flat heat exchange tube 31.

[0090] For example, in combination with Figure 10 , assuming that the bending section 312 is bent along the bending line L. In each second fin 43, the closer to the bending line L, the smaller the length of the second sub-fin 431. That is to say, Figure 10 the second sub-fins on the left side of the topmost bending line L in satisfy: the second sub-fin 431 located at the leftmost side ( Figure 10The length of the middle 431b) is greater than that of the second sub-fin 431 located in the middle( Figure 10 the length of the middle 431b), the second sub-fin 431 located in the middle( Figure 10 the length of the middle 431b) is greater than that of the second sub-fin 431 near the bending line L( Figure 10 the length of the middle 431b).

[0091] On the other hand, an embodiment of the present disclosure also provides a manufacturing method of a heat exchanger. The manufacturing method is used to manufacture the heat exchanger described above. The manufacturing method includes:

[0092] S101: Connect the heat exchange tube assembly to the first header and the second header respectively to form a flat heat exchanger.

[0093] S102: Set the first fin 41 between the straight sections 311 of two adjacent heat exchange flat tubes 31 in the flat heat exchanger, so that the first fin 41 is respectively connected to the straight sections 311 of the two adjacent heat exchange flat tubes 31.

[0094] S103: Install the second fin 43 at the bending reserved area of each heat exchange flat tube 31 through the positioning structure 42. Connect the first side in the length direction of the first header 1 to the corresponding positioning structure 42, and the second side of the second fin 43 is spaced from the nearest bending section 312.

[0095] S104: Bend the bending reserved area of each heat exchange flat tube 31 so that the pre-bending area of each heat exchange flat tube 31 forms a bending section 312.

[0096] Before bending, by setting the positioning structure 42 in the bending reserved area of the heat exchange flat tube 31 of the flat heat exchanger and installing the second fin 43 in the bending reserved area of the heat exchange flat tube 31 through the positioning structure 42, after bending, the bending section 312 of the heat exchange flat tube 31 can have the second fin 43 to improve the heat exchange efficiency. Moreover, the presence of the second fin 43 can further protect the bending section 312 and further reduce the possibility of damage to the bending section 312. Moreover, since one end of each second fin 43 is connected to the corresponding positioning structure 42 and the other end is spaced from the nearest bending section 312. When the heat exchange flat tube 31 is bent, it can avoid the problem that it is difficult to bend because both ends of the fin are connected to the heat exchange flat tube 31, and avoid the problem that the heat exchange flat tube 31 is deformed and damaged due to the fin pulling the heat exchange flat tube 31.

[0097] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A heat exchanger, characterized in that, The heat exchanger includes a first header (1), a second header (2), a heat exchange tube assembly (3), and a fin assembly (4); The heat exchange tube assembly (3) includes a plurality of stacked flat heat exchange tubes (31) arranged at intervals along the length direction of the first header (1), and both ends of each flat heat exchange tube (31) among the plurality of flat heat exchange tubes (31) are respectively communicated with the first header (1) and the second header (2). Each flat heat exchange tube (31) includes at least two straight sections (311) and at least one bent section (312) along its own length direction, and each two adjacent straight sections (311) are connected by one bent section (312); The fin assembly (4) includes a plurality of first fins (41), a plurality of positioning structures (42), and a plurality of second fins (43). Each first fin (41) among the plurality of first fins (41) is arranged between the straight sections (311) of two adjacent flat heat exchange tubes (31), and the first fin (41) is respectively connected to the two adjacent straight sections (311). The plurality of positioning structures (42) correspond one by one to the bent sections (312) of all the flat heat exchange tubes (31), and each positioning structure (42) among the plurality of positioning structures (42) is sleeved outside the corresponding bent section (312). The plurality of second fins (43) correspond one by one to the plurality of positioning structures (42). Along the length direction of the first header (1), each second fin (43) has a first side and a second side arranged oppositely. The first side of the second fin (43) is connected to the corresponding positioning structure (42), and the second side of the second fin (43) is spaced from the nearest bent section (312).

2. The heat exchanger according to claim 1, characterized in that, The positioning structure (42) includes a first positioning piece (421). Along the length direction of the first header (1), the first positioning piece (421) has a first connecting surface (4211) and a second connecting surface (4212) arranged oppositely. Both the first connecting surface (4211) and the second connecting surface (4212) face the flat heat exchange tube (31). The first connecting surface (4211) is connected to the corresponding second fin (43) of the positioning structure (42), and the second connecting surface (4212) is connected to the corresponding bent section (312) of the positioning structure (42); Along the width direction of the flat heat exchange tube (31), one side edge of the first positioning piece (421) is bent towards the second connecting surface (4212) to form a first positioning groove (4210) for clamping the corresponding bent section (312) of the positioning structure (42).

3. The heat exchanger according to claim 2, wherein Along the length direction of the flat heat exchange tube (31), the second fin (43) includes a plurality of sequentially arranged V-shaped structures; The positioning structure (42) further includes a plurality of positioning bars (422). The plurality of positioning bars (422) are arranged at intervals along the length direction of the flat heat exchange tube (31) on the first connection surface (4211), and the length direction of each positioning bar (422) among the plurality of positioning bars (422) is the width direction of the flat heat exchange tube (31). Each of the positioning bars (422) is connected to the narrower end of the V-shaped structure corresponding to the positioning structure (42).

4. The heat exchanger according to claim 1, characterized in that, Along the length direction of the flat heat exchange tube (31), the second fin (43) includes a plurality of successively arranged V-shaped structures. The positioning structure (42) includes a third positioning piece (4203) and a plurality of third positioning ribs (4205). The third positioning piece (4203) has a first connection surface (4211) and a second connection surface (4212) arranged oppositely. The second connection surface (4212) is connected to the flat heat exchange tube (31). Along the width direction of the flat heat exchange tube (31), one side edge of the third positioning piece (4203) is bent toward the second connection surface (4212) to form a second positioning groove (420). The plurality of third positioning ribs (4205) are arranged at intervals along the length direction of the flat heat exchange tube (31) and are all parallel to the second connection surface (4212). The length direction of each third positioning rib (4205) among the plurality of third positioning ribs (4205) is the width direction of the flat heat exchange tube (31). One end of each third positioning rib (4205) is connected to the groove wall of the second positioning groove (420), and each third positioning rib (4205) is connected to the narrower end of the V-shaped structure corresponding to the positioning structure (42).

5. The heat exchanger according to claim 1, wherein, The positioning structure (42) includes a first positioning piece (421) and a second positioning piece (423). Along the length direction of the first header (1), the first positioning piece (421) has a first connection surface (4211) and a second connection surface (4212) arranged oppositely. Along the width direction of the flat heat exchange tube (31), one side edge of the first positioning piece (421) is bent toward the second connection surface (4212) to form a third positioning groove (4200) for clamping the corresponding bent section (312) of the positioning structure (42). The second positioning piece (423) is parallel to the second connection surface (4212) and is connected to the groove wall of the third positioning groove (4200). The second positioning piece (423) is connected to the corresponding second fin (43) of the positioning structure (42). The side of the second positioning piece (423) facing the second connection surface (4212) and the second connection surface (4212) are respectively connected to the corresponding bent section (312) of the positioning structure (42).

6. The heat exchanger according to claim 5, characterized in that, Along the width direction of the flat heat exchange tube (31), the second positioning piece (423) has a first side and a second side which are arranged oppositely, and the first side of the second positioning piece (423) is connected to the first positioning piece (421); The second fin (43) corresponding to the positioning structure (42) is located at the second side of the second positioning piece (423), and the positioning structure (42) and the corresponding second fin (43) are an integral structural member.

7. The heat exchanger according to claim 6, characterized in that, The second fin (43) includes a plurality of second sub-fins (431), the plurality of second sub-fins (431) are arranged in sequence along the length direction of the flat heat exchange tube (31), and two adjacent second sub-fins (431) are inclined in different directions relative to the connected positioning structure (42).

8. The heat exchanger according to claim 6, characterized in that, The second fin (43) includes a plurality of second sub-fins (431), the plurality of second sub-fins (431) are divided into a plurality of sub-fin units along the width direction of the flat heat exchange tube (31), and each sub-fin unit includes a plurality of second sub-fins (431) arranged at intervals along the length direction of the flat heat exchange tube (31); In the same sub-fin unit, two adjacent second sub-fins (431) are inclined in different directions relative to the connected positioning structure (42), and all the second sub-fins (431) in the same sub-fin unit have the same inclination direction.

9. The heat exchanger according to claim 8, characterized in that, In the length direction of the bent section (312) and from the edge of the bent section (312) to the middle of the bent section (312), the length of the second sub-fin (431) gradually decreases.

10. A manufacturing method of a heat exchanger, characterized in that, The manufacturing method is used to manufacture the heat exchanger according to any one of claims 1-9, and the manufacturing method includes: Connecting the heat exchange tube assembly to the first header and the second header respectively to form a flat heat exchanger; Arranging a first fin (41) between the straight sections (311) of two adjacent flat heat exchange tubes (31) in the flat heat exchanger, so that the first fin (41) is connected to the straight sections (311) of two adjacent flat heat exchange tubes (31) respectively; Installing the second fin (43) at the bending reserved area of each flat heat exchange tube (31) through the positioning structure (42), so that the first side of each second fin (43) in the length direction of the first header (1) is connected to the corresponding positioning structure (42), and the second side of the second fin (43) is spaced from the nearest bent section (312); Bending the bending reserved area of each flat heat exchange tube (31) so that the pre-bent area of each flat heat exchange tube (31) forms a bent section (312).

Images