Flat tube and heat exchanger

Abstract

The present invention discloses a flat tube, which is formed by bending a single plate. The plate is bent to form a flat tube with a plurality of flow channels inside. Among them, the tube walls at various parts of the outer periphery of the flat tube are all multi-layer structures with the same number of layers and the number of layers is two or more. The flat tube according to the embodiment of the present invention can improve the uniformity and pressure resistance of the tube wall.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a flat tube. Background Art

[0002] The flat tube is a key part of a multi-channel heat exchanger. In the past, extrusion flat tubes were generally used for products. However, the production technology and equipment threshold of extrusion flat tubes are relatively high, and the procurement cost is relatively large. Moreover, the wall thickness of the extrusion tube is limited by the extrusion process, and it is difficult to further reduce the weight.

[0003] At present, some enterprises have begun to use folded flat tubes, which are widely used in the automotive air-conditioning industry. Compared with extrusion flat tubes, the forming speed and the finished product rate have been greatly improved, which is suitable for large-scale on-site production, and both the logistics and procurement cycles can be greatly shortened. Moreover, the alloy matching scheme of the flat tube material is more flexible. For example, by applying multi-layer alloys, the anti-corrosion performance can be greatly improved.

[0004] However, in the design of the folded flat tubes in the related art, there is an inevitable defect, that is, there is a problem of uneven thickness (for example, the patent with the application number 200920074076.3). The thickness of the flat tube at the folded overlapping part is twice that of the non-overlapping area. However, according to the short-board effect, the strength of the flat tube depends on the thin-wall part, so the overlapping part actually wastes materials. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems in the related art to some extent. For this purpose, an object of the present invention is to provide a flat tube with high pressure resistance.

[0006] The flat tube according to an embodiment of the present invention is formed by bending a single plate, and the plate is bent to form a flat tube with a plurality of flow channels inside. Among them, the tube wall on the outer periphery of the flat tube is a multi-layer structure with the same number of layers and the number of layers is two or more.

[0007] The flat tube according to an embodiment of the present invention can improve the uniformity and pressure resistance of the tube wall.

[0008] In addition, the flat tube according to the above embodiment of the present invention may further have the following additional technical features:

[0009] In an embodiment of the present invention, the plate includes an inner wall plate and an outer wall plate. The inner wall plate is bent to form a plurality of flow channels; the outer wall plate is laminated on the outside of the inner wall plate to form the tube wall with the multi-layer structure.

[0010] In an embodiment of the present invention, the inner wall plate includes a plurality of ribs and connecting plates. The plurality of ribs are arranged in sequence in a first direction. One ends of two adjacent ribs are closed and the other ends are open and are connected by the connecting plate. The ribs and the connecting plates are arranged in an alternating manner and are connected in sequence, and the connecting plates are stacked and arranged on the inner side of the outer wall plate.

[0011] In an embodiment of the present invention, a flow channel is formed between two adjacent ribs, and the cross-sectional shape of the flow channel is triangular, rectangular or funnel-shaped.

[0012] In an embodiment of the present invention, the overlapping ends of two adjacent ribs overlap a certain length in the thickness direction.

[0013] In an embodiment of the present invention, the cross-section of the rib is linear, curved or polygonal along the width direction of the flat tube.

[0014] In an embodiment of the present invention, the inner wall plate further includes a first side plate portion and a second side plate portion. The plurality of ribs are arranged between the first side plate portion and the second side plate portion, and the first side plate portion and the second side plate portion are respectively connected to adjacent ribs to form a flow channel, and the side plate portion is stacked and attached to the outer wall plate.

[0015] In an embodiment of the present invention, the outer wall plate includes: a first edge plate and a second edge plate. The first edge plate is adjacent to the first side plate portion and covers one side of the inner wall plate in a second direction and the second side plate portion; and the second edge plate is adjacent to the second side plate portion and covers the other side of the inner wall plate in the second direction and the first side plate portion, wherein the second direction is perpendicular to the first direction.

[0016] In an embodiment of the present invention, the position where the first edge plate is connected to the first side plate portion has a first step portion, the position where the second edge plate is connected to the second side plate portion has a second step portion, the end of the first edge plate cooperates with the second step portion, the end of the second edge plate cooperates with the first step portion, and the outer surface of the outer wall plate is flush.

[0017] In an embodiment of the present invention, the thickness of the tube wall at various places on the outer periphery of the flat tube is the same.

[0018] The present invention also provides a heat exchanger.

[0019] The heat exchanger according to an embodiment of the present invention includes: a first header, a second header, and a flat tube. The two ends of the flat tube are respectively connected and communicated with the first header and the second header. At least two flat tubes are arranged at intervals, and fins are provided between two adjacent flat tubes. The flat tube is the flat tube described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional schematic diagram of a flat tube according to an embodiment of the present invention.

[0021] Figures 2a - 2d are schematic diagrams of flat tubes according to different embodiments of the present invention.

[0022] Figures 3a - 3g is a schematic diagram of the manufacturing process of a flat tube according to an embodiment of the present invention.

[0023] Figure 4 is Figure 2a a partial schematic diagram of

[0024] Figure 5 is a schematic diagram of a heat exchanger according to an embodiment of the present invention.

[0025] Reference numerals: Heat exchanger 100, first header 21, second header 22, fin 3, flat tube 1, tube wall 101, flow channel 102, inner wall plate 11, outer wall plate 12, rib 111, connecting plate 112, first direction A, second direction B, groove portion 103, first side plate portion 113, second side plate portion 114, first edge plate 121, second edge plate 122. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To solve the problems of uneven wall thickness and material waste of conventional folded flat tubes, the present invention proposes a new structure of a folded flat tube 1, which can ensure that the wall thickness of the folded flat tube is consistent.

[0027] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0028] As Figure 1 shown in FIGS. 1 and 2, according to an embodiment of the present invention, the flat tube 1 is formed by bending a single plate. The plate is bent to form a flat tube 1 having a plurality of flow channels 102 inside. Among them, the tube wall 101 on the outer periphery of the flat tube 1 is a multi-layer structure with the same number of layers everywhere, and the number of layers of the multi-layer structure is two or more.

[0029] According to the flat tube 1 of the embodiment of the present invention, the tube wall 101 is a multi-layer structure everywhere, and the number of layers of the multi-layer structure of the tube wall 101 is the same everywhere. Therefore, the short-board effect can be avoided, the pressure resistance of each part of the tube wall 101 of the flat tube 1 is consistent, and the structures of each part of the tube wall 101 can be fully utilized, avoiding material waste while improving the pressure resistance of the flat tube 1.

[0030] In addition, the structure formed by bending the plate includes a pipe wall 101 and a rib 111 located inside the pipe wall. The flow channel 102 inside the pipe wall 101 can be formed by the cooperation of the rib 111 and the pipe wall 101.

[0031] For example Figures 2a to 2d , in an embodiment of the present invention, the plate includes an inner wall plate 11 and an outer wall plate 12. The inner wall plate 11 is bent to form a plurality of flow channels 102. The outer wall plate 12 is laminated on the outside of the inner wall plate. The laminated structure formed by a part of the outer wall plate 12 and the inner wall plate 11 can form a pipe wall 101 with a multi-layer structure. By forming the flow channels 102 inside the inner wall plate 11 and then forming the aforementioned multi-layer structure by the laminated structure of a part of the inner wall plate 11 and the outer wall plate 12, the forming of the flat tube 1 can be facilitated and the forming efficiency of the flat tube 1 can be improved. In addition, the inner wall plate 11 forms a plurality of flow channels 102 and is wrapped by the outer wall plate 12, which can improve the sealing performance of the flow channels 102.

[0032] Among them, the lamination of two plates means that the surfaces of the two plates are attached. Specifically, the outer wall plate 12 is laminated on the inner side of the inner wall plate 11 means that the outer wall plate 12 is arranged around the inner wall plate 11, and the inner surface of the outer wall plate 12 is attached to the outer surface of the inner wall plate 11. Among them, a part of the inner wall plate 11 forms the flow channel 102, and another part of the inner wall plate 11 and the outer wall plate 12 are constructed into the aforementioned laminated structure.

[0033] It should be noted that the structures such as the inner wall plate 11 and the outer wall plate 12 in the present invention are formed by continuously bending the plate.

[0034] Furthermore, for example Figures 2a to 2d , the inner wall plate 11 includes a plurality of ribs 111 and connecting plates 112. The plurality of ribs 111 are arranged in sequence along the first direction A. One ends of two adjacent ribs 111 are closed and the other ends are open and are connected by the connecting plate 112. The ribs 111 and the connecting plates 112 are arranged alternately and are connected in sequence. The connecting plates 112 are laminated on the inner side of the outer wall plate 12.

[0035] That is to say, during the bending process of the plate, the plate is bent in sequence along the first direction A to form a form in which the ribs 111 and the connecting plates 112 are staggered, and the other ends of the ribs 111 connected to both ends of the connecting plate 112 (located at both ends of the connecting plate 112 in the first direction A) are closed to form the flow channel 102.

[0036] Specifically, for example Figures 2a to 2d, a plurality of ribs 111 are arranged in sequence along the first direction A. Among them, the ribs 111 can extend along the second direction B. Among them, in the second direction B of the ribs 111, one end of one rib 111 among two adjacent ribs 111 is closed to one end of the other rib 111, and the other end of one rib 111 among two adjacent ribs 111 is open to the other end of the other rib 111. Moreover, the open ends of two adjacent ribs 111 are connected by a connecting plate 112. Among them, a flow channel 102 is formed by the combination of two adjacent ribs 111 and the connecting plate 112 connecting these two ribs 111.

[0037] During the forming process of the flat tube 1, the plate is bent to form a plurality of groove portions 103. The two side walls of the groove portion 103 are formed as ribs 111, and the bottom wall of the groove portion 103 is formed as a connecting plate 112. Closing the opening of the groove portion 103 can form a flow channel 102.

[0038] For example, as Figure 4 shown, it includes a first rib 111a, a second rib 111b, and a third rib 111c. The first rib 111a, the second rib 111b, and the third rib 111c are arranged in sequence along the left - right direction. The first rib 111a and the second rib 111b are adjacent. The upper end of the first rib 111a is closed to the upper end of the second rib 111b, and the lower end of the first rib 111a and the lower end of the second rib 111b are open. And the lower end of the first rib 111a and the lower end of the second rib 111b are connected by a first connecting plate 112a, thereby forming a flow channel 102. The second rib 111b and the third rib 111c are adjacent. The lower end of the second rib 111b is closed to the lower end of the third rib 111c, and the upper end of the second rib 111b and the upper end of the third rib 111c are open. And the upper end of the second rib 111b and the upper end of the third rib 111c are connected by a second connecting plate 112b, thereby forming a flow channel 102.

[0039] Also as shown in Figure 3, during the process of forming the flat tube 1, the plate is bent into a wavy shape and formed with a plurality of groove portions 103, and the opening directions of two adjacent groove portions 103 are opposite. In this way, the two side walls of each groove portion 103 are respectively formed as ribs 111, and the bottom of each groove portion 103 is formed as a connecting plate 112.

[0040] Furthermore, a triangular flow channel 102 is formed between two adjacent ribs 111. In other words, a flow channel 102 is formed between two adjacent ribs 111, and the cross-section of the flow channel is triangular. That is to say, two adjacent ribs 111 are in a form that inclines towards each other at a predetermined angle. After two adjacent ribs 111 incline towards each other at a predetermined angle, a triangular flow channel 102 is defined between two adjacent ribs 111 and a connecting plate 112 connecting these two ribs 111. A triangle has a stable structure. In the entire flat tube 1, the arranged triangles can support the tube wall 101, thereby improving the pressure resistance of the flat tube 1.

[0041] Of course, using other shapes for the ribs 111 can also improve the pressure resistance of the flat tube 1.

[0042] For example, the flow channel 102 formed between two adjacent ribs 111 can also have a cross-section in the shape of a rectangle, a funnel, etc.

[0043] Such as Figures 2b to 2d In some embodiments of the present invention, the overlapping ends of two adjacent ribs 111 overlap a certain length in the thickness direction. The overlapping part of the two ribs 111 has relatively high pressure resistance and can better support the closure of the flat tube 1, thereby further improving the pressure resistance of the flat tube 1.

[0044] In addition, such as Figure 2a The cross-section of the rib 111 of the present invention can be in a straight line shape arranged along the width direction of the flat tube. Such as Figure 2b And 2c The rib 111 of the present invention can be in a curved shape arranged along the width direction of the flat tube. Such as Figure 2d The rib 111 of the present invention can be in a broken line shape arranged along the width direction of the flat tube.

[0045] Specifically, the cross-section of the rib 111 of the present invention can be in a straight line shape, a curved shape or a broken line shape arranged along the width direction of the flat tube. Of course, the rib 111 can also be in other shapes. The rib 111 has various structural forms to meet different heat exchange requirements and strength requirements.

[0046] In addition, such as Figure 2a A triangular structure is formed between two adjacent ribs 111.

[0047] Such as Figure 2b Two adjacent ribs 111 are generally in a triangular structure, and the overlapping ends of two adjacent ribs 111 overlap a predetermined length along the flat thickness direction.

[0048] Such as Figure 2c, the overlapping ends of two adjacent ribs 111 overlap a predetermined length in the thickness direction, and a rectangular flow channel 102 is defined between two adjacent ribs 111. Specifically, referring to FIG. 3, the rib includes a first plate portion, a second plate portion, and a connecting portion. The first plate portion and the second plate portion extend in the up and down direction (or the thickness direction of the flat tube), and the connecting portion extends in the left and right direction (or the width direction of the flat tube). The left and right edges of the connecting plate portion are respectively connected to the first plate portion and the second plate portion. The two first plate portions of two adjacent ribs 111 overlap in the left and right direction. The two second plate portions of two adjacent ribs 111 are spaced apart in the left and right direction and are connected by a connecting plate 112. The connecting plate 112, the two second plate portions, and the two connecting portions form a rectangular flow channel 102.

[0049] As Figure 2d , the overlapping ends of two adjacent ribs 111 overlap a predetermined length, and a funnel-shaped flow channel 102 is defined between two adjacent ribs 111. Specifically, referring to Figure 2d , the cross-section of the rib is in an arc shape extending in the up and down direction. One end of two adjacent ribs is closed and the other end is separated and connected by a connecting plate 112. The connecting plate 112 and the two adjacent ribs form a funnel-shaped flow channel 102. The width dimension of the cross-section of the flow channel 102 from one side to the other side in the up and down direction (or the thickness direction of the flat tube) (the dimension in the width direction of the flat tube or the dimension in the left and right direction in Figure 2d increases gradually.

[0050] Furthermore, the inner wall plate 11 further includes a first side plate portion 113 and a second side plate portion 114. A plurality of ribs 111 are provided between the first side plate portion 113 and the second side plate portion 114. The first side plate portion 113 and the second side plate portion 114 are respectively connected to adjacent ribs 111 and form a flow channel 102. The side plate portion is laminated and attached to the outer wall plate 12. Thereby, the number of flow channels 102 can be increased, and thus the heat exchange efficiency of the flat tube 1 can be improved.

[0051] Among them, the first side plate portion 113 is connected to one end of an adjacent rib 111 and the other end is closed to form a flow channel 102. The second side plate portion 114 is connected to one end of an adjacent rib 111 and the other end is closed to form a flow channel 102.

[0052] Specifically, as Figures 2a to 2d, the first side plate portion 113 is provided on the left side of the plurality of ribs 111, the second side plate portion 114 is provided on the right side of the plurality of ribs 111, one end of the first side plate portion 113 is connected to the upper end of the leftmost rib 111 (the rib 111 adjacent to the first side plate portion 113), and the other end of the first side plate portion 113 is joined to the lower end of the leftmost rib 111 to form a flow channel 102; one end of the second side plate portion 114 is connected to the lower end of the rightmost rib 111 (the rib 111 adjacent to the second side plate portion 114), and the other end of the second side plate portion 114 is joined to the upper end of the rightmost rib 111 to form a flow channel 102.

[0053] In an embodiment of the present invention, as Figures 2a to 2d , the outer wall plate 12 includes: a first edge wrapping plate 121 and a second edge wrapping plate 122. The first edge wrapping plate 121 is adjacent to the first side plate portion 113 and covers one side of the inner wall plate 11 along the second direction B and the second side plate portion 114. The second edge wrapping plate 122 is adjacent to the second side plate portion 114 and covers the other side of the inner wall plate 11 along the second direction B and the first side plate portion 113, wherein the second direction B is perpendicular to the first direction A.

[0054] Further, in combination with the structure of the flat tube 1 described above, the first edge wrapping plate 121, the connecting plate 112 located on one side of the inner wall plate 11 along the second direction B, and the second side plate portion 114 are stacked to form a multi-layer structure, and the second edge wrapping plate 122, the connecting plate 112 located on the other side of the inner wall plate 11 along the second direction B, and the second side plate portion 114 are stacked to form a multi-layer structure, and these combinations form the entire pipe wall 101.

[0055] By covering the outer side of the inner wall plate 11 with the first edge wrapping plate 121 and the second edge wrapping plate 122, the first edge wrapping plate 121 and the second edge wrapping plate 122 cooperate with the inner wall plate 11 to form a multi-layer pipe wall 101. Moreover, by covering the inner wall plate 11 with the first edge wrapping plate 121 and the second edge wrapping plate 122 respectively, the structure of the entire flat tube 1 is made uniform, and it is convenient to form the flat tube 1 by bending a whole plate, improving the forming efficiency and sealing performance of the flat tube 1.

[0056] Preferably, the inner wall plates 11 of the first edge - wrapping plate 121 and the second edge - wrapping plate 122 are joined end to end. In other words, one end of the first edge - wrapping plate 121 is joined to one end of the second edge - wrapping plate 122 (or one end of the first edge - wrapping plate 121 is bent to one end of the second edge - wrapping plate 122), and the other end of the second edge - wrapping plate 122 is joined to the other end of the first edge - wrapping plate 121 (or the other end of the second edge - wrapping plate 122 is bent to the other end of the first edge - wrapping plate 121). Preferably, the outer surfaces of the outer wall plates 12 are flush. This makes the appearance of the flat tube 1 beautiful, and no raised structure will be formed on the outer surface of the flat tube 1. There are no protrusions on the outer surfaces of the multi - channels, which is convenient for transportation and handling.

[0057] Furthermore, referring to FIG. 2, the position where the first edge - wrapping plate 121 is connected to the first edge plate part 113 has a first step part, and the position where the second edge - wrapping plate 122 is connected to the second edge plate part 114 has a second step part. The end of the first edge - wrapping plate 121 cooperates with the second step part, and the end of the second edge - wrapping plate 122 cooperates with the first step part.

[0058] In addition, in the present invention, any part of the pipe wall 101 is a double - layer structure, and the plate is an alloy aluminum plate.

[0059] Referring to Figures 3a - 3g , the forming steps of an embodiment in the present invention include:

[0060] 1. As Figure 3a , bend the middle part of the plate into a wavy shape, that is, having a shape with grooves arranged in sequence. Preferably, the shape of the groove is a rectangular groove.

[0061] 2. As Figures 3b - 3d , squeeze the openings of the grooves inward in sequence until they are pressed into the shape of a plurality of flow channels 102. For example, the triangular flow channels 102 in FIG. d.

[0062] 3. As Figure 3e , process the internal bends and the clamping structures at both ends, such as the aforementioned first edge plate part 113, first edge - wrapping plate 121, second edge plate part 114, and second edge - wrapping plate 122.

[0063] 4. As Figure 3f , bend the two - side plates inward.

[0064] 5. As Figure 3g , use the arc bends at both ends to clamp and fix, forming a complete folded flat tube 1.

[0065] In the present invention, through the novel folding method, the folded flat tube 1 has a uniform thickness of the entire pipe wall 101, which can effectively improve the pressure - resistance strength and save materials. The ribs 111 in the flat tube 1 are cross - connected to improve the overall strength of the flat tube 1.

[0066] In addition, as described above, the flow channel 102 in the flat tube 1 of the present invention can be triangular in shape, or a rectangular bending transition structure can be formed at the bottom of the triangle, thereby effectively increasing the strength of the rib 111. In addition, the ribs 111 inside the flat tube 1 can be double-layer composite to increase the overall strength of the flat tube 1. Similarly, the internal ribs 111 of the flat tube 1 can be bent into a curved shape, which is easier to process than the rectangular bending structure.

[0067] Preferably, in the present invention, the thickness of the tube wall at each part of the outer periphery of the flat tube 1 is the same, thereby further avoiding the short-board effect, making the pressure resistance strength of each part of the tube wall on the outer periphery of the flat tube consistent, so that the pressure resistance strength of the flat tube 1 can be effectively improved and material waste can be avoided.

[0068] In addition, the present invention also provides a heat exchanger 100.

[0069] As Figure 5 , the heat exchanger 100 according to the embodiment of the present invention includes: a first header 21, a second header 22, and a flat tube 1. Wherein, both ends of the flat tube 1 are respectively connected and communicated with the first header 21 and the second header 22. The flat tube 1 includes at least two arranged at intervals, and fins 3 are provided between two adjacent flat tubes 1. The flat tube 1 is the flat tube shown in the foregoing embodiment.

[0070] The heat exchanger 100 according to the embodiment of the present invention adopts the foregoing flat tube 1, which can avoid the short-board effect while improving the pressure resistance strength of the flat tube, making the pressure resistance strength of each part of the tube wall 101 of the flat tube 1 consistent, so that the structures of each part of the tube wall 101 can be fully utilized, and material waste is avoided while improving the pressure resistance strength of the flat tube 1.

[0071] Specifically, referring to Figure 5 , the first header 21 extends in the up and down direction, the second header 22 extends in the up and down direction, and the first header 21 and the second header 22 are parallel to each other. The flat tube 1 is arranged between the first header 21 and the second header 22, and the left end of the flat tube 1 is communicated with the first header 21, and the right end of the flat tube 2 is communicated with the second header 22. A plurality of flat tubes are arranged at intervals in the up and down direction, and fins are provided between two adjacent flat tubes 1.

[0072] In addition, during the manufacturing process of the heat exchanger 100 of the present invention, after the flat tube, the header, and the fins are installed together, they are welded in a furnace together.

[0073] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0074] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A flat tube, which is formed by bending a sheet, is characterized in that The plate is bent to form a flat tube having a plurality of flow channels inside. Wherein, the tube wall at each part of the outer periphery of the flat tube is a multi-layer structure with the same number of layers and the number of layers is more than two, and the thickness of the tube wall at each part of the outer periphery of the flat tube is the same; The plate includes: An inner wall plate, the inner wall plate is bent to form a plurality of flow channels; An outer wall plate, the outer wall plate is laminated on the outside of the inner wall plate to form the tube wall with the multi-layer structure.

2. The flat tube according to claim 1, characterized in that, The inner wall plate includes a plurality of rib strips and connecting plates. The plurality of rib strips are arranged in sequence along the first direction. One ends of two adjacent rib strips are closed and the other ends are open. The two rib strips at the open ends are connected by the connecting plate. The rib strips and the connecting plates are arranged at intervals and are connected in sequence, and the connecting plate is arranged inside the outer wall plate and is in contact with the inner side of the outer wall plate.

3. The flat tube according to claim 2, characterized in that, A flow channel is formed between two adjacent rib strips, and the cross-sectional shape of the flow channel is triangular, rectangular or funnel-shaped.

4. The flat tube according to claim 2, characterized in that, The ends of two adjacent rib strips that are closed overlap a certain length in the thickness direction.

5. The flat tube according to any one of claims 2-4, characterized in that, The cross-section of the rib strip is linear, curved or zigzag along the width direction of the flat tube.

6. The flat tube according to any one of claims 2-4, characterized in that, The inner wall plate further includes a first side plate portion and a second side plate portion. The plurality of rib strips are arranged between the first side plate portion and the second side plate portion, and the first side plate portion and the second side plate portion are respectively connected to adjacent rib strips to form a flow channel, and the side plate portion is laminated and in contact with the outer wall plate.

7. The flat tube according to claim 6, wherein The outer wall plate includes: A first edge wrapping plate, the first edge wrapping plate is adjacent to the first side plate portion and wraps one side of the inner wall plate along the second direction and the second side plate portion; and A second edge wrapping plate, the second edge wrapping plate is adjacent to the second side plate portion and wraps the other side of the inner wall plate along the second direction and the first side plate portion, wherein, the second direction is perpendicular to the first direction.

8. The flat tube according to claim 7, wherein The position where the first edge wrapping plate is connected to the first side plate portion has a first step portion, the position where the second edge wrapping plate is connected to the second side plate portion has a second step portion, the end of the first edge wrapping plate cooperates with the second step portion, the end of the second edge wrapping plate cooperates with the first step portion, and the outer surface of the outer wall plate is flush.

9. A heat exchanger, characterized in that, Including; A first header pipe, a second header pipe; Flat tubes, both ends of the flat tubes are respectively connected and communicated with the first header pipe and the second header pipe. There are at least two flat tubes arranged at intervals, and fins are provided between two adjacent flat tubes. The flat tubes are the flat tubes according to any one of claims 1-8.

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