Micro-channel evaporator and manufacturing method thereof

Abstract

The present application relates to a kind of microchannel evaporator and the manufacturing method of microchannel evaporator, wherein, microchannel evaporator includes heat exchange unit, heat exchange unit includes at least two parallelly arranged tube bank parts, tube bank part includes flat tube, flat tube includes at least two parallelly arranged flat tube sections, each flat tube section is integrated structure and is provided with second bending between adjacent two rows of flat tube sections;The flat tube of each column tube bank part is integrated structure, and is provided with first bending between adjacent two column tube bank parts.It can improve the heat exchange efficiency of microchannel evaporator, reduce overall volume, ensure overall system reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange, in particular to a micro-channel evaporator and a manufacturing method of the micro-channel evaporator. BACKGROUND

[0002] The flat tube of the micro-channel evaporator commonly used in frost-free air-cooled refrigerator and the like is in a circular tube structure, but the heat exchange performance of the circular tube is poor, and more refrigerant is filled in, and usually the heat exchange of the refrigerant in the middle of the tube is less, which leads to a larger volume of the micro-channel evaporator, and thus the use volume of the refrigerator and the like is reduced. Moreover, the micro-channel evaporator in the form of circular tube has a small heat exchange area and a low heat exchange efficiency under the same diameter, and has a large volume, and usually has more rows, which increases the air side resistance and affects the reliability of the system.

[0003] Therefore, how to improve the heat exchange efficiency of the micro-channel evaporator, reduce the overall volume, and ensure the reliability of the overall system is a technical problem to be solved by those skilled in the art. SUMMARY

[0004] The purpose of the present application is to provide a micro-channel evaporator and a manufacturing method of the micro-channel evaporator, which can improve the heat exchange efficiency of the micro-channel evaporator, reduce the overall volume, and ensure the reliability of the overall system.

[0005] To solve the above technical problems, the present application provides a micro-channel evaporator, which comprises a heat exchange unit, the heat exchange unit comprises at least two rows of parallelly arranged tube row parts, the tube row part comprises a flat tube, the flat tube comprises at least two rows of parallelly arranged flat tube segments, each flat tube segment is in an integral structure and is provided with a second bending between adjacent two rows of flat tube segments, and the flat tube of each row of tube row parts is in an integral structure and is provided with a first bending between adjacent two rows of tube row parts.

[0006] The present application further provides a manufacturing method of a micro-channel evaporator, which comprises the following steps:

[0007] S1: forming a heat exchange tube row in which a plurality of rows of flat tube segments are parallelly arranged by first bending of a flat tube;

[0008] S2: forming a heat exchange unit arranged in at least two layers of structures by second bending of the heat exchange tube row.

[0009] The present application comprises the following technical effects: the heat exchange unit is provided with only one flat tube, the flat tube forms a serpentine structure with multiple rows of flat tube segments in each row of tube arrangement part through the second bending, and the first bending of the flat tube is connected between the adjacent two rows of tube arrangement parts to form a three-dimensional structure. Since the flat tube is formed through bending, the pipeline of the heat exchange unit has no welding seam, the process is simple and convenient to process. Moreover, compared with the circular tube, the flat tube can avoid the waste of the heat exchange medium at the internal center position, the heat exchange area of the flat tube is larger under the condition of the same flow of the heat exchange medium, so that the heat exchange efficiency can be improved, the arrangement between the rows and the columns is facilitated, so that the overall volume of the evaporator can be effectively reduced, the space arrangement is facilitated, the air side resistance can be reduced, and the system reliability can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a structural schematic view of the micro-channel evaporator provided by the embodiment of the present application;

[0011] Figure 2 is a front view of Figure 1 ;

[0012] Figure 3 is a side view of Figure 1 ;

[0013] Figure 4 and Figure 5 are structural schematic views of the heat exchange tube arrangement;

[0014] Figure 6 and Figure 7 are structural schematic views of the second bending of the heat exchange tube arrangement;

[0015] Figure 8 is a structural schematic view of the first bending and the second bending;

[0016] Figure 9 is a structural schematic view of the header;

[0017] Figure 10 is a structural schematic view of the aluminum plate;

[0018] Figure 11 is a structural schematic view of the first slot core rod;

[0019] Figure 12 is a structural schematic view of the initial model slot;

[0020] Figure 13 is a structural schematic view of the intermediate model slot;

[0021] Figure 14 is a structural schematic view of the second slot core rod;

[0022] Figure 15Fig. 1 is a structural schematic diagram of a pipe core rod.

[0023] Fig. 1 is a structural schematic diagram of a pipe core rod. Figures 1-15 In the drawings, the following reference signs are used:

[0024] 1-pipe row part;

[0025] 2-flat pipe, 21-flat pipe segment, 22-wide side wall, 23-narrow side wall;

[0026] 3-first bending;

[0027] 4-second bending, 41-arc structure;

[0028] 5-fin;

[0029] 6-header, 61-first connecting end, 62-second connecting end, 63-arc segment, 64-aluminum plate, 65-first slot core rod, 66-initial model slot, 661-first opening part, 67-intermediate model slot, 671-second opening part, 68-second slot core rod, 69-pipe core rod;

[0030] 7-heat exchange pipe row;

[0031] 8-reserved gap. DETAILED DESCRIPTION

[0032] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0033] The micro-channel evaporator provided by the embodiment of the present application comprises a heat exchange unit, and the heat exchange unit specifically comprises at least two rows of parallel pipe row parts 1, the pipe row part 1 comprises a flat pipe 2, the flat pipe 2 of each row of pipe row parts 1 comprises at least two rows of parallel flat pipe segments 21, each flat pipe segment 21 is of an integral structure and is provided with a second bending 4 between the adjacent two rows of flat pipe segments 21, that is to say, the flat pipe 2 in each row of pipe row parts 1 is of an integral structure, and the flat pipe 2 forms at least two flat pipe segments 21 arranged in a serpentine structure through the second bending 4; meanwhile, the flat pipe 2 of each row of pipe row parts 1 is of an integral structure, and the flat pipe 2 is provided with a first bending 3 between the adjacent two rows of pipe row parts 1, that is to say, all the flat pipes 2 are of an integral structure, and the adjacent two rows of pipe row parts 1 are connected through the first bending 3 of the flat pipe 2.

[0034] In detail, the heat exchange unit is provided with only one flat tube 2, the flat tube 2 forms a serpentine structure with multiple flat tube sections 21 in each column of tube row part 1 through the second bending 4, and the flat tube 2 is connected between the adjacent two column of tube row parts 1 through the first bending 3 to form a three-dimensional structure. Since the flat tube 2 is formed by bending, the pipeline of the heat exchange unit is free of welding seam, the process is simple and convenient to process. Moreover, compared with the circular tube, the flat tube 2 can avoid the waste of the heat exchange medium at the internal center position, the heat exchange area of the flat tube 2 is larger under the condition of the same flow of the heat exchange medium, so that the heat exchange efficiency can be improved, and the flat tube 2 is convenient for arrangement between each row and each column, so that the overall volume of the evaporator can be effectively reduced, the space arrangement is convenient, the air side resistance can be reduced, and the system reliability can be ensured.

[0035] In the above embodiment, as shown in Figure 1 , the wide side walls 22 of the flat tube sections 21 on both sides of the first bending 3 are oppositely arranged, that is, the first bending 3 is a bending around the width direction of the flat tube 2, the narrow side walls 23 of the two flat tube sections 21 on both sides of the second bending 4 are oppositely arranged, that is, the second bending 4 is a bending around the thickness direction of the flat tube 2, and as shown in Figure 3 , the second bending 4 is provided with an arc-shaped structure 41 protruding outward from the wide side wall 22 of the flat tube section 21, and the protruding directions of the arc-shaped structures 41 are consistent. The narrow side walls 23 of the flat tube sections 21 in each column of tube row part 1 (as shown in Figure 2 ) are oppositely arranged. As shown in Figure 8 , the second bending 4 includes a first section 42, a second section 43 and a third section 44 which are sequentially and communicatively arranged at the bending, the first section 42 and the third section 44 are respectively communicated with the adjacent two flat tube sections 21, the second section 43 protrudes outward from the side wall of the flat tube 2 and forms the above-mentioned arc-shaped structure 41, and the first section 42, the second section 43 and the third section 44 gradually transition, so that the adjacent two flat tube sections 21 reach the flat-laying state of the narrow side walls 23 through the second bending 4. In this way, the curvature of the bending of the flat tube 2 at this position can be increased, and damage and the like caused by large deformation at this bending can be avoided.

[0036] Alternatively, the flat tube 2 can be stacked through the second bending 4, and the flat tube sections 21 can be flat-laid through the first bending 3, which are not limited in detail. That is, the flat tube 2 is bent in two ways, one of which is stacked, and the other of which is flat-laid. The heat exchange unit includes only one flat tube 2, the flat tube 2 is sequentially connected by multiple flat tube sections 21, and part of the flat tube sections 21 are stacked and part of the flat tube sections 21 are flat-laid, thereby forming a three-dimensional heat exchange unit.

[0037] In addition, in this embodiment, the terms "first" and "second" in the first bend 3 and the second bend 4 are only used for naming purposes to distinguish between the two types of bends. There is no specific order between them. Specifically, the first bend 3 can be performed first and then the second bend 4, or the second bend 4 can be performed first and then the first bend 3. The width of the flat tube 2 (flat tube segment 21) is greater than its height. Therefore, the flat tube 2 has two sets of oppositely arranged sidewalls. The wide sidewall 22 refers to the sidewall with the larger width (equal to the width of the flat tube) of the two sets of sidewalls, and the narrow sidewall 23 refers to the sidewall with the smaller width (corresponding to the thickness of the flat tube) of the two sets of sidewalls.

[0038] In the above embodiment, the microchannel evaporator also includes fins 5 disposed on the outer wall of the flat tube 2 to increase the heat exchange area of ​​the flat tube 2 and improve the heat exchange efficiency.

[0039] Furthermore, fins 5 are disposed between each flat tube segment 21. In this embodiment, the specific structure of the fins 5 is not limited, such as... Figure 7 As shown, the fins 5 can be configured as including multiple rows of parallel sheet-like structures, with the sheet-like structures connected between the oppositely arranged flat tube sections 2 of the wide sidewalls 22. Alternatively, they can be configured as follows: Figure 6 As shown, the fins 5 are configured as corrugated sheet structures, with the crests and troughs of the corrugated sheet structure fixedly connected to the wide sidewalls 22 of the two adjacent flat tube sections 21. Of course, in this embodiment, the specific structure of the fins 5 is not limited; for example, they can also be configured as fixed protrusions along the outer periphery of the flat tube 2. The sheet-like or corrugated structure of the fins 5 can increase the heat exchange area and ensure heat exchange efficiency.

[0040] In the above embodiment, no fins 5 are provided at the second bend 4 and the first bend 3. This arrangement facilitates the formation of the bend and avoids the fins 5 affecting the bend.

[0041] When in use, the fin density at the top of the microchannel evaporator is greater than that at the bottom. In other words, the fins at the top are more densely packed, while those at the bottom are more sparsely packed. This allows for easier drainage of accumulated water after defrosting, thereby improving heat exchange efficiency.

[0042] In the above embodiment, the microchannel evaporator further includes two manifolds 6, which are respectively connected to both ends of the flat tube 2. Specifically, as shown... Figure 9 As shown, the manifold 6 includes a first connecting end 61 and a second connecting end 62 that are interconnected. The first connecting end 61 is used to communicate with the end of the flat tube 2, and the second connecting end 62 is used to communicate with an external connecting pipe, so that the external connecting pipe can pass the cooling medium into the flat tube 2 along the manifold 6. Both ends of the flat tube 2 are located on the same side of the heat exchange unit. This arrangement makes the two manifolds 6 located on the same side of the heat exchange unit, which facilitates connection operations.

[0043] Further, the manifold 6 is further provided with a limiting structure, the end of the flat tube 2 is connected with the first connecting end 61 through insertion, specifically, when the end of the flat tube 2 is inserted into the first connecting end 61 and abuts against the limiting structure, it indicates that the cooperation between the two has been in place, then the two can be fixed through welding, bonding and the like, or the flat tube 2 and the first connecting end 61 can also be fixed through interference fit, which is not limited specifically herein. The limiting structure is convenient for installation between the flat tube 2 and the manifold 6, and improves installation efficiency.

[0044] Further, the first connecting end 61 and the second connecting end 62 are further provided with an arc-shaped section 63, the end of the flat tube 2 inserted into the first connecting end 61 can abut against the inner wall of the arc-shaped section 63, the inner wall of the arc-shaped section 63 can form the limiting structure, or the limiting structure can also be formed in the first connecting end 61 through setting a protrusion and the like, which is not limited specifically herein, and the limiting structure formed by the inner wall of the arc-shaped section 63 can simplify the overall structure and simplify the manufacturing process.

[0045] In the above embodiment, the materials of the flat tube 2, the manifold 6 and the fin 5 are all aluminum, which is light and soft, and is convenient for forming process.

[0046] Further, the manifold 6 is a structure integrally formed through a progressive die, specifically, the aluminum plate 64 (as shown in FIG. 6) is formed into an initial model groove 66 through the action of a first slot core rod 65 (as shown in FIG. 5), the initial model groove 66 (as shown in FIG. 6) includes a receiving cavity and a first opening part 661, wherein the receiving cavity is matched with the first slot core rod 65, and the first opening part 661 is communicated with the receiving cavity, then the first slot core rod 65 is taken out from the first opening part 661, then one side end of the initial model groove 66 is cut to form an intermediate model groove 67 (as shown in FIG. 7) and a second opening part 671 is formed at the cutting position, the second opening part 671 is communicated with the receiving cavity, the intermediate model groove 67 is provided with the first opening part 661 and the second opening part 671, one end of a second slot core rod 68 (as shown in FIG. 8) is inserted into the receiving cavity from the first opening part 661, a pipe core rod 69 (as shown in FIG. 9) is inserted into the receiving cavity from the second opening part 671, and the manifold 6 is formed through extrusion joint surface, the second slot core rod 68 and the pipe core rod 69 are taken out, and the manifold 6 with the structure as shown in FIG. 10 is obtained, the position of the second slot core rod 68 forms the above-mentioned first connecting end 61, and the position of the pipe core rod 69 forms the above-mentioned second connecting end 62. Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 9

[0047] ​​​​​​​Of course, in this embodiment, the specific structure of the manifold 6 is not limited. For example, it can be configured as any two interconnecting ends, wherein the first connecting end 61 can be sealed and connected to the end of the flat tube 2, and the second connecting end 62 can be connected to the external pipe. Alternatively, the manifold 6 can be machined to have a through hole inside, with one end of the through hole forming the first connecting end 61 and the other end forming the second connecting end 62. When the manifold 6 is manufactured using a progressive die integral molding structure, the manufacturing process is relatively simple and the production efficiency is high.

[0048] In addition, this invention also provides a method for fabricating a microchannel evaporator. Specifically, the method for fabricating the microchannel evaporator includes the following steps:

[0049] S1: The flat tube 2 is bent through the first bend 3 to form a heat exchange tube bank 7 with multiple rows of flat tube segments 21 arranged in parallel;

[0050] S2: The heat exchange tube array 7 is formed into a heat exchange unit with at least two layers of structure by the second bend 4.

[0051] In step S1, each flat tube segment 21 within the heat exchange tube bank 7 is formed by a flat tube 2 through a first bend 3, resulting in a serpentine arrangement of the heat exchange tube bank 7. In step S2, the heat exchange tube bank 7 is further bend 4 to form a serpentine arrangement of heat exchange units. Each heat exchange unit comprises at least two layers; that is, a three-dimensional structure with at least two layers and at least two rows per layer is formed by two bends of a single flat tube 2. The pipes of the heat exchange unit are seamless, making the process simple and easy to manufacture. Furthermore, compared to round tubes, flat tubes 2 avoid wasting heat exchange medium in the central area. Under the condition of the same flow rate of heat exchange medium, flat tubes 2 have a larger heat exchange area, thereby improving heat exchange efficiency. Flat tubes 2 also facilitate the arrangement of rows and layers, effectively reducing the overall volume of the evaporator, facilitating spatial arrangement, reducing air-side resistance, and ensuring system reliability.

[0052] Furthermore, in step S1, the wide sidewalls 22 of each row of flat tube sections 21 of the heat exchange tube row 7 are opposite to each other.

[0053] The step between steps S1 and S2 also includes step S11: setting fins 5 between each row of flat tube sections 21.

[0054] In other words, after the flat tube 2 undergoes the first bend 3, the flat tube segments 21 are stacked, and then fins 59 are arranged between the wide sidewalls 22 of each row of flat tube segments 21 (e.g., Figure 4 and Figure 5 As shown), then in step S2 above, the heat exchange tube array 7 is passed through the second bend 4 (as shown). Figure 6 and Figure 7 As shown) forming a three-dimensional structure (such asFigure 1 As shown in FIG. 1.

[0055] Specifically, the fins 5 can be the above-mentioned sheet structure or the corrugated structure, which are not specifically limited herein.

[0056] Further, in the step S11, when the fins 5 are arranged between the flat tube segments 21, the fins 5 are arranged with a reserved gap 8 in the length direction of the heat exchange tube row 7, the reserved gap 8 is not provided with the fins 5, and the end of the flat tube segment 21 is also not provided with the fins 5, and then the heat exchange tube row 7 is bent again at the reserved gap 8 to form the heat exchange unit as shown in FIG. 2. Figure 6 As shown in FIG. 2. Figure 7 As shown in FIG. 2, in the step S2, the heat exchange tube row 7 is bent again at the reserved gap 8 to form the heat exchange unit. The end of the heat exchange tube row 7 refers to the position of the first bending 3, and the reserved gap 8 refers to the position of the second bending 4, that is, the fins 5 are not arranged at the bending positions of the flat tube 2, so as to facilitate the bending process and avoid the influence of the fins 5 on the bending.

[0057] In addition, in order to ensure that the density of the fins located at the upper position is greater than the density of the fins located at the lower position in the use state, in the step S11, when the fins 5 are arranged, the density of the fins of the part of the heat exchange tube row 7 located at the upper layer after the second bending 4 can be set to be relatively large, and the density of the fins of the part of the heat exchange tube row 7 located at the lower layer after the second bending 4 can be set to be relatively small according to the direction of the second bending 4. As shown in FIG. 3. Figure 3 As shown in FIG. 3. Figure 4 As shown in FIG. 3, along the length direction of the heat exchange tube row 7, the fins 5 are divided into three sections by the reserved gap 8, and the density of the three sections of the fins 5 gradually decreases. As shown in FIG. 4, after the second bending 4, the section of the fins 5 with the largest density is located at the uppermost layer, and the section of the fins 5 with the smallest density is located at the lowermost layer. Figure 1 As shown in FIG. 4.

[0058] In the above embodiment, after the step S2, the step S3 of preparing two collecting tubes 6 and mounting the two collecting tubes 6 at the two ends of the flat tube 2 is further included. The collecting tube 6 is in communication with the flat tube 2 and the external connecting tube respectively, so that the external connecting tube can pass the cooling medium into the flat tube 2 along the collecting tube 6.

[0059] Further, in the step S3, the preparation of the collecting tube 6 specifically includes:

[0060] An aluminum plate 64 (as shown in FIG. 5) is prepared, a first slot core rod 65 (as shown in FIG. 6) is placed between the two layers of the aluminum plate 64, and the aluminum plate 64 is extruded to form an initial model slot 66 (as shown in FIG. 7). Figure 10 Figure 11 As shown in FIG. 6. Figure 12 ​As shown, the initial model groove 66 is provided with a receiving cavity and a first opening part 661 which is in communication with the receiving cavity, the receiving cavity is matched with the first groove mandrel 65, and then the first groove mandrel 65 is taken out from the first opening part 661;

[0061] Then, one side end of the initial model groove 66 is cut to form an intermediate model groove 67, as shown in Figure 13 As shown, the intermediate model groove 67 is provided with a second opening part 671 which is in communication with the receiving cavity;

[0062] One end of the second groove mandrel 68 is inserted into the receiving cavity from the first opening part 661, as shown in Figure 14 As shown, the structure of the second groove mandrel 68 is the same as that of the end part of the flat tube 2, one end of the pipe mandrel 69 is inserted into the receiving cavity from the second opening part 671, as shown in Figure 15 As shown, the structure of the pipe mandrel 69 is the same as that of the external connecting pipe, the side wall of the receiving cavity is extruded so that the first opening part 661 forms a first connecting end 61 matched with the second groove mandrel 68, the second opening part 671 forms a second connecting end 62 matched with the pipe mandrel 69, and finally the second groove mandrel 68 and the pipe mandrel 69 are taken out to form the collector 6 as shown in Figure 9 As shown in

[0063] Of course, the specific structure of the collector 6 in the embodiment is not limited, for example, it can also be provided as any two connecting ends which can be in communication with each other, wherein the first connecting end 61 can be in sealed communication with the end part of the flat tube 2, and the second connecting end 62 can be in communication with the external connecting pipe. Alternatively, the collector 6 can also be formed by machining to have a through hole inside, one end of the through hole forms the first connecting end 61, and the other end of the through hole forms the second connecting end 62. When the collector 6 is integrally formed by a progressive die, the preparation process is relatively simple, and the production efficiency is high.

[0064] In addition, when the first connecting end 61 and the second connecting end 62 are provided with the above-mentioned arc-shaped section 63, the first groove mandrel 65 has a corresponding arc-shaped structure.

[0065] The above is only a preferred embodiment of the present application, and it should be noted that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, which should be considered as the protection scope of the present application.

Claims

1. A microchannel evaporator characterized by, The heat exchange unit comprises at least two rows of parallelly arranged tube banks (1), the tube bank (1) comprises a flat tube (2), the flat tube (2) comprises at least two rows of parallelly arranged flat tube segments (21), each flat tube segment (21) is of an integral structure and is provided with a second bending (4) between adjacent two rows of flat tube segments (21); The flat tube (2) of each row of tube banks (1) is of an integral structure, and a first bending (3) is arranged between adjacent two rows of tube banks (1); Further comprising two collecting tubes (6), the two collecting tubes (6) are respectively communicated with two ends of the flat tube (2); The collecting tube (6) comprises a first connecting end (61) and a second connecting end (62) which are communicated with each other, the first connecting end (61) is used for communicating with the end of the flat tube (2), and the second connecting end (62) is used for communicating with an external connecting pipe; The end of the flat tube (2) can be inserted into the first connecting end (61) to abut against the limiting structure; An arc-shaped section (63) is arranged between the first connecting end (61) and the second connecting end (62), the end of the flat tube (2) inserted into the first connecting end (61) can abut against the inner wall of the arc-shaped section (63), and the inner wall of the arc-shaped section (63) can form the limiting structure.

2. The microchannel evaporator of claim 1, wherein, The wide side walls (22) of the flat tube segments (21) on both sides of the first bending (3) are opposite to each other, and the narrow side walls (23) of the flat tube segments (21) on both sides of the second bending (4) are opposite to each other; The second bending (4) is provided with an arc-shaped structure (41) which protrudes outwardly from the wide side wall (22) of the flat tube segment (21), and the protruding directions of the arc-shaped structures (41) are consistent.

3. The microchannel evaporator of claim 2 wherein, Further comprising a fin (5) arranged on the outer wall of the flat tube (2).

4. The microchannel evaporator of claim 3 wherein, The fin comprises a plurality of rows of parallelly arranged sheet structures, and the sheet structures are fixedly arranged on the flat tube segments with opposite wide side walls (22); Alternatively, the fin is of a corrugated structure, and the wave crest and the wave trough of the corrugated structure are respectively fixedly connected with the wide side walls (22) of adjacent two layers of flat tube segments (21).

5. The microchannel evaporator of claim 3 wherein, The first bending (3) and the second bending (4) are not provided with the fin (5).

6. The microchannel evaporator of any of claims 3-5, wherein, In the use state, the density of the fin (5) located above is greater than the density of the fin (5) located below.

7. The microchannel evaporator of any of claims 1-5, wherein, The collecting tube (6) is of a structure integrally formed by a progressive die.

8. The microchannel evaporator of any of claims 1-5, wherein, The material of the flat tube (2) and the collecting tube (6) is aluminum.

9. A method of fabricating a microchannel evaporator, comprising: The method comprises the following steps: S1: forming a heat exchange tube bank in which a plurality of rows of flat tube segments are parallelly arranged by a first bending of a flat tube; S2: forming a heat exchange unit in which at least two layers of structures are arranged by a second bending of the heat exchange tube bank; S3: two headers are prepared, and the two headers are respectively installed at two ends of the flat tubes, the header comprises a first connecting end and a second connecting end, the end of the flat tube is connected with the first connecting end through insertion, an arc segment is further arranged between the first connecting end and the second connecting end, the end of the flat tube inserted into the first connecting end can abut against the inner wall of the arc segment, and the inner wall of the arc segment can form a limiting structure.

10. The method of claim 9, wherein, In step S1, the wide side walls of the flat tube segments of each row of the heat exchange tube rows are opposite to each other; The step S1 and the step S2 further comprise a step S11 of arranging fins between the flat tube segments of each row.

11. The method of claim 10, wherein the microchannel evaporator is manufactured by a process comprising: In step S11, when the fins are arranged between the flat tube segments of each row, the fins are arranged with a reserved gap in the length direction of the heat exchange tube rows; In step S2, the heat exchange tube rows are secondly bent along the reserved gaps to form the heat exchange unit.

12. The method of claim 9, wherein the microchannel evaporator is manufactured by a process comprising: In step S3, the preparation of the header specifically comprises: A first groove core rod is placed between two layers of aluminum plates, the aluminum plates are extruded to form an initial model groove, the initial model groove is provided with a receiving cavity and a first opening part in communication with the receiving cavity, the receiving cavity is matched with the first groove core rod, and then the first groove core rod is taken out from the first opening part; One side end of the initial model groove is cut to form an intermediate model groove, the intermediate model groove is provided with a second opening part, and the second opening part is in communication with the receiving cavity; One end of a second groove core rod is inserted into the receiving cavity from the first opening part, one end of a pipe core rod is inserted into the receiving cavity from the second opening part, the side wall of the receiving cavity is extruded, so that the first opening part forms a first connecting end matched with the second groove core rod, the second opening part forms a second connecting end matched with the pipe core rod, the first connecting end and the second connecting end are in communication in the receiving cavity, the second groove core rod and the pipe core rod are taken out, and the second groove core rod is the same as the end structure of the flat tube.

10. The method of claim 9, wherein, In step S1, the wide side walls of the flat tube segments of each row of the heat exchange tube rows are opposite to each other; The step S1 and the step S2 further comprise a step S11 of arranging fins between the flat tube segments of each row. In step S11, when the fins are arranged between the flat tube segments of each row, the fins are arranged with a reserved gap in the length direction of the heat exchange tube rows; In step S2, the heat exchange tube rows are secondly bent along the reserved gaps to form the heat exchange unit. In step S3, the preparation of the header specifically comprises: A first groove core rod is placed between two layers of aluminum plates, the aluminum plates are extruded to form an initial model groove, the initial model groove is provided with a receiving cavity and a first opening part in communication with the receiving cavity, the receiving cavity is matched with the first groove core rod, and then the first groove core rod is taken out from the first opening part; One side end of the initial model groove is cut to form an intermediate model groove, the intermediate model groove is provided with a second opening part, and the second opening part is in communication with the receiving cavity; One end of a second groove core rod is inserted into the receiving cavity from the first opening part, one end of a pipe core rod is inserted into the receiving cavity from the second opening part, the side wall of the receiving cavity is extruded, so that the first opening part forms a first connecting end matched with the second groove core rod, the second opening part forms a second connecting end matched with the pipe core rod, the first connecting end and the second connecting end are in communication in the receiving cavity, the second groove core rod and the pipe core rod are taken out, and the second groove core rod is the same as the end structure of the flat tube.

Images