Heat exchanger

Abstract

A heat exchanger (100). The heat exchanger (100) comprises a plurality of flat tubes (10) and a plurality of fins (20); the flat tubes (10) are arranged at intervals, one fin (20) is arranged between every two adjacent flat tubes (10), and two sides of the fin (20) in the thickness direction are connected to the flat tube (10); each flat tube (10) at least comprises a first channel (112), a second channel (122), and a communication channel (13) making the first channel (112) communicated with the second channel (122); the side of the flat tube (10) close to the communication channel (13) is provided with limiting portions (3), and the limiting portions (3) extend along the thickness direction of the flat tube (10).

Description

Heat exchanger

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application No. 202421752297.2, filed on July 23, 2024, and entitled “Heat exchanger”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application is in the technical field of heat exchangers and refrigeration systems, in particular, relates to a heat exchanger. BACKGROUND

[0004] Heat exchangers are widely used in refrigeration systems, usually including flat tubes and fins, the flow channels in the flat tubes are used for the flow of heat exchange medium, the flat tubes are connected with the fins and exchange heat with the fins, the fins increase the contact area of the flat tubes with the air, thereby improving the efficiency of heat exchange between the flat tubes and the external environment.

[0005] A plurality of flow channels are formed in the flat tube, in order to prolong the flow path of the heat exchange medium in the flat tube, thereby improving the heat exchange efficiency, the plurality of flow channels at one end on the same side serve as the inlet and outlet of the flat tube, and the other end is connected through a communication channel, a plurality of flat tubes are arranged along the thickness direction thereof at intervals, fins are arranged between adjacent two flat tubes, and the fins extend in a wave shape along the length direction of the flat tube, and the fins near the communication channel are prone to pop and reverse. SUMMARY

[0006] According to various embodiments of the present application, a heat exchanger is provided.

[0007] A heat exchanger includes a plurality of flat tubes and a plurality of fins, the plurality of flat tubes are arranged at intervals along the thickness direction thereof, and the fins are arranged between adjacent flat tubes;

[0008] The flat tube is configured with a first channel, a second channel, and a communication channel communicating the first channel and the second channel, and the flat tube has a limiting portion on the side close to the communication channel, the limiting portion is arranged extending along the thickness direction of the flat tube.

[0009] In one embodiment, the limiting portion is a flange plate connecting the flat tube, the flange plate is arranged extending along the thickness direction of the flat tube.

[0010] In one embodiment, the flange plate is a plurality of flange plates, and the plurality of flange plates are arranged at intervals along the width direction of the flat tube.

[0011] In one embodiment, the flange plate extends along the thickness direction of the flat tube to at least one adjacent flat tube.

[0012] In one of the embodiments, the flange plates on the side of the adjacent two flat tubes close to each other extend reversely along the thickness direction of the flat tube, and are staggered in the width direction of the flat tube.

[0013] In one of the embodiments, the flange plates on the side of the adjacent two flat tubes close to each other extend reversely along the thickness direction of the flat tube, and the flange plates of the adjacent two flat tubes overlap in the thickness direction of the flat tube; and / or, the flange plates on the side of the adjacent two flat tubes close to each other extend reversely along the thickness direction of the flat tube, and the flange plates of the adjacent two flat tubes overlap in the width direction of the flat tube.

[0014] In one of the embodiments, the length of the fin is L, the width of the fin is H, two sides of the fin in the width direction are provided with a drainage port, the drainage port is located between the adjacent two flange plates, the center line of the drainage port divides the fin into asymmetric first and second sections, the length of the first section is less than the length of the second section, and the width of the drainage port is a along the length direction of the fin.

[0015] In one of the embodiments, the flange plate is rectangular, the length of the flange plate projected on the first section is n, the length of the first section is b, and b / 4≤n≤b-2 / a is satisfied.

[0016] In one of the embodiments, the length of the flange plate projected on the second section is m, and m=n is satisfied.

[0017] In one of the embodiments, the flange plate is triangular, and the length of the base of the flange plate is n; and / or, the flange plate is elliptical, and the major axis of the ellipse is n.

[0018] In one of the embodiments, the flange plate is rectangular, the length of the flange plate projected on the second section is m, the length of the fin is L, (L-b) / 4≤m≤L-b-a / 2 is satisfied, and the width of the flange plate is d, H / 4≤d≤H is satisfied.

[0019] In one of the embodiments, the side surface of the fin close to the limiting part abuts against each other.

[0020] In one of the embodiments, the flat tube has a plurality of protrusions, the plurality of protrusions extend along the thickness direction of the flat tube, and the plurality of protrusions cooperatively constitute the first channel, the second channel and the communication channel.

[0021] In one embodiment, the flat tube comprises a first plate and a second plate, the first plate is provided with a plurality of first protrusions spaced from each other, the second plate is provided with a plurality of second protrusions spaced from each other, the first protrusions and the second protrusions are oppositely arranged to form first channels, second channels and communication channels, and the first protrusions and the second protrusions extend reversely along the thickness direction of the flat tube.

[0022] In one embodiment, along the length direction of the first plate, the projections of at least part of the first protrusions in the width direction of the first plate are not arranged to overlap, and / or along the length direction of the second plate, the projections of at least part of the second protrusions in the width direction of the second plate are not arranged to overlap.

[0023] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0024] To better describe and illustrate embodiments and / or examples of the inventions disclosed herein, reference can be made to one or more drawings. Additional details or examples used to describe the drawings should not be considered limiting to the scope of any of the disclosed inventions, presently described embodiments and / or examples, and the best mode presently contemplated of these inventions.

[0025] Fig. 1 is a dimensioned drawing of the fins and the flange plate of one embodiment of the heat exchanger provided by the present application.

[0026] Fig. 2 is a structural schematic drawing of a rectangular flange plate of one embodiment of the heat exchanger provided by the present application.

[0027] Fig. 3 is a structural schematic drawing of an oval flange plate of one embodiment of the heat exchanger provided by the present application.

[0028] Fig. 4 is a structural schematic drawing of a triangular flange plate of one embodiment of the heat exchanger provided by the present application.

[0029] Fig. 5 is a structural schematic drawing of a flange plate of one embodiment of the heat exchanger provided by the present application.

[0030] Fig. 6 is a structural schematic drawing of a flange plate of one embodiment of the heat exchanger provided by the present application.

[0031] Fig. 7 is a structural schematic drawing of one embodiment of the heat exchanger provided by the present application.

[0032] Fig. 8 is a structural schematic drawing of the inside of one embodiment of the flat tube provided by the present application.

[0033] Fig. 9 is a partial enlarged view of A in Fig. 7 provided by the present application.

[0034] Fig. 10 is a structural schematic view of an embodiment of the heat exchanger provided by the present application with a header.

[0035] In the drawings, the symbols represent the following meanings: 100, heat exchanger; 10, flat tube; 11, first plate; 111, first protrusion; 112, first channel; 110, protrusion; 12, second plate; 121, second protrusion; 122, second channel; 13, communication channel; 20, fin; 21, first section; 22, second section; 23, drain port; 30, flange plate; 40, header; 3, limiting portion. DETAILED DESCRIPTION

[0036] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways beyond the specific embodiments described and claimed herein. It is therefore intended that the present application not be limited in scope to the specific embodiments disclosed but rather that the scope of the present application be measured by the broadest permissible interpretation of the claims that follow.

[0037] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions as used in the description of the specification are for the purpose of illustration only and do not indicate the only orientation of the present application.

[0038] In addition, the terms "first", "second", and the like, are used only to describe the elements and do not indicate or imply relative importance or a quantity of the indicated elements. Thus, a feature with a "first", "second" designation can include at least one of the feature. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0039] In the present application, unless specifically stated and limited otherwise, a first feature "on", "above", or "over" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "under", "below", or "underneath" a second feature can be directly below or obliquely below the second feature, or simply mean that the first feature is horizontally lower than the second feature. A first feature "under", "below", or "underneath" a second feature can be directly below or obliquely below the second feature, or simply mean that the first feature is horizontally lower than the second feature.

[0040] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the associated listed items.

[0041] The present application provides a heat exchanger 100, a turn-up plate 30 is arranged on the side of the flat tube 10 without the header 40, the turn-up plate 30 can stop and limit the fin 20, and prevents the problem of the fin 20 bouncing.

[0042] Please refer to FIG. 1 and FIG. 7-10, the heat exchanger 100 comprises a plurality of flat tubes 10 and a plurality of fins 20, the plurality of flat tubes 10 are arranged at intervals along the thickness direction of the flat tube 10, and the fins 20 are arranged between adjacent flat tubes 10, and the two sides of the thickness direction of the fin 20 are connected with the flat tube 10; the flat tube 10 is configured with a first channel 11, a second channel 12 and a communication channel 13 connecting the first channel 11 and the second channel 12, and the flat tube 10 has a limiting portion 3 on the side close to the communication channel 13, and the limiting portion 3 is arranged along the thickness direction of the flat tube 10. In this way, the fin 20 is located between the flat tube 10, and the heat on each flat tube 10 can be transferred to the fins 20 on both sides along the thickness direction of the flat tube 10, and the fin 20 improves the contact area between the flat tube 10 and the air, thereby improving the heat exchange efficiency. And the flat tube 10 is configured with a first channel 11 and a second channel 12, so that the heat exchange medium flows from the first channel 11 to the second channel 12, and the process of flowing from the first channel 11 to the second channel 12 through the communication channel 13, and the heat exchange is carried out twice in the two channels, so that the heat exchange of the heat exchange medium is more thorough. The communication channel 13 is far away from the inlet and the outlet, so the communication channel 13 is not provided with a header 40 on this side, and the fin 20 on this side is prone to deformation and fin springing due to the absence of limiting structure, so the limiting portion 3 arranged on the communication portion relies on the abutting effect of the limiting portion 3 and the fin 20 to limit the fin 20 to the side of the limiting portion 3 facing the inlet, so that the structure of the heat exchanger 100 is more durable and stable.

[0043] In one embodiment, the side of the fin 20 and the limiting portion 3 close to each other abuts each other.

[0044] It can be understood that the side of the fin 20 and the limiting portion 3 close to each other abuts each other, thereby increasing the stability of the fin 20 arranged between adjacent flat tubes 10.

[0045] It needs to be explained that the number of flow channels (i.e. the first channel 11 and the second channel 12) inside the flat tube 10 is not limited to two, and can be set to more than two, which can be flexibly adjusted according to the working requirements. In this embodiment, two are taken as an example for detailed description.

[0046] Further, the limiting portion 3 is a flange plate 30 connecting the flat tube 10, and the flange plate 30 is arranged along the thickness direction of the flat tube 10. The flange plate 30 is a plurality of, and the plurality of flange plates 30 are arranged at intervals along the width direction of the flat tube 10. And / or, the flange plate 30 is a plurality of, and at least two flange plates 30 are arranged in reverse along the thickness direction of the flat tube 10. In this way, the plurality of flange plates 30 can limit the plurality of fins 20, so as to ensure the limiting effect of the flange plate 30 on the fin 20. Moreover, the flange plates 30 are arranged at intervals, which can facilitate the fin 20 to discharge condensed water.

[0047] In other embodiments, the limiting portion 3 can also be provided as a protrusion and a rib structure, and is not limited to the above-mentioned flange plate 30 structure.

[0048] In view of the feature that the flange plates 30 are arranged at intervals, the two sides of the fin 20 in the width direction are provided with the drainage openings 23, the drainage openings 23 extend towards the center line of the fin 20 in the width direction, and the projection of the drainage openings 23 on the fin 20 does not overlap the flange plate 30, so the flange plate 30 will not stop the drainage openings 23, thereby avoiding the influence of the flange plate 30 on the drainage of the drainage openings 23. And the drainage openings 23 are located between two adjacent flange plates 30, so that the condensed water can be smoothly discharged from the drainage openings 23 and between the two flange plates 30, and will not be hindered by the flange plate 30.

[0049] In other embodiments, the drainage openings 23 on the fin 20 can also be provided on only one side, and only need to be arranged in a staggered manner with the flange plate 30. The drainage openings 23 can also be provided on both sides of the fin 20 in the length direction to further improve the drainage efficiency.

[0050] The two drainage openings 23 located on both sides of the fin 20 in the width direction can be arranged in alignment, thereby making the drainage more common. They can also be arranged in a staggered manner, thereby improving the structural strength of the fin 20.

[0051] Referring to FIG. 5, the flange plate 30 extends along the thickness direction of the flat tube 10 to at least one adjacent flat tube 10. That is, not every flat tube 10 is provided with a flange plate 30, and some flange plates 30 can extend transversely and span multiple flat tubes 10 to simultaneously stop and limit multiple fins 20.

[0052] The length of the fin 20 is L, the width of the fin 20 is H, and the center line of the drainage opening 23 divides the fin 20 into asymmetric first and second sections 21 and 22, thereby adapting to the internal structure of the asymmetric heat exchanger 100, and the asymmetric arrangement of the drainage opening 23 can improve the heat exchange efficiency. The length of the first section 21 is less than the length of the second section 22, and the width of the drainage opening 23 is a along the length direction of the fin 20.

[0053] Specifically, the shape of the flange plate 30 has various embodiments, which are described one by one.

[0054] Referring to FIG. 2, in an embodiment, the flange plate 30 is provided in a rectangular shape, and the length of the flange plate 30 projected on the first section 21 is n, and the length of the first section 21 is b, which satisfies b / 4≤n≤b-2 / a. In this way, it is ensured that the flange plate 30 will not be too short to cause insufficient abutment strength of the flange plate 30 to the fin 20, and also prevents the flange plate 30 from being too long to increase material consumption and cost, and also hinders the discharge of condensed water.

[0055] Since there are multiple flanging plates 30, the projections of the flanging plates 30 adjacent to the flanging plate 30 are located on the second section 22, and the length of the flanging plate 30 located on the second section 22 is m, m = n, thereby providing a balanced abutting effect.

[0056] Of course, in other embodiments, m and n can also be unequal to adapt to asymmetric fins 20. For example, the length of the fin 20 is L, which satisfies (L-b) / 4≤m≤L-b-a / 2. Similarly, m thus arranged can flexibly adjust the length according to the length of the fin 20, the width of the drainage port 23, and the division of the drainage port 23 to the fin 20, which not only ensures that the flanging plate 30 is not too short to cause insufficient abutting strength of the flanging plate 30 to the fin 20, but also prevents the flanging plate 30 from being too long to increase material consumption and increase costs, and also hinders the discharge of condensate water.

[0057] In the present embodiment, the width of the flanging plate 30 whose projections are located on the first section 21 and the second section 22 respectively is the same and is d, which satisfies H / 4≤d≤H. In this way, the width range of the flanging plate 30 is reasonably planned, and the abutting effect of the flanging plate 30 can also be ensured at the same time, and the drainage capacity and material cost are comprehensively considered.

[0058] Please refer to FIG. 3, in another embodiment, the flanging plate 30 is arranged as an ellipse, and the length of the major axis of the ellipse is n, the length of the first section 21 is b, which satisfies b / 4≤n≤b-2 / a. In this way, similar to the above, the coverage area and the action area of the flanging plate 30 are ensured, and the abutting effect of the flanging plate 30 to the fin 20 is ensured, and the area covered by the flanging plate 30 is prevented from being too large to affect the drainage of the fin 20.

[0059] Further, the fin length L and the length n of the major axis of the flanging plate 30 satisfy L / 3≤n≤3L / 4, it can be understood that if n is too small, the flanging plate 30 is not conducive to blocking the fin 20, and if n is too large, it is not conducive to the drainage of the flat tube 10.

[0060] Please refer to FIG. 4, in another embodiment, the flanging plate 30 is arranged as a triangle, and the length of the base of the triangle is n, and the height of the triangle is m, the relationship between n and m can inherit the various relationship formulas in the rectangular embodiment above, and the technical effects are similar to the above, which will not be repeated here.

[0061] In one embodiment, referring to FIG. 5, the flanging plates 30 on the side of the adjacent two flat tubes 10 close to each other extend in the thickness direction of the flat tube 10 in the opposite direction, and the flanging plates 30 of the adjacent two flat tubes 10 are staggered in the width direction of the flat tube 10.

[0062] It can be understood that in this way, the blocking area of the flanging plate 30 to the fin 20 is increased, and the stability of the overall structure of the heat exchanger 100 is improved.

[0063] In some embodiments, referring to FIG. 5, the flange plates 30 on the side of the adjacent two flat tubes 10 close to each other extend reversely along the thickness direction of the flat tube 10, and the flange plates 30 of the adjacent two flat tubes 10 overlap along the thickness direction of the flat tube 10.

[0064] In some embodiments, referring to FIG. 6 or FIG. 7, the flange plates 30 on the side of the adjacent two flat tubes 10 close to each other extend reversely along the thickness direction of the flat tube 10, and the flange plates 30 of the adjacent two flat tubes 10 overlap along the width direction of the flat tube 10.

[0065] In some embodiments, referring to FIG. 6, the flange plates 30 on the side of the adjacent two flat tubes 10 close to each other extend reversely along the thickness direction of the flat tube 10, and the flange plates 30 of the adjacent two flat tubes 10 overlap along the width direction and the thickness direction of the flat tube 10.

[0066] It can be understood that the overlapping area can increase the overall structural strength of the flange plate 30, thereby more favorably preventing the fins 20 from popping out or being damaged.

[0067] In addition, the size of the overlapping area along the thickness direction of the flat tube is defined as e, and the interval of the side surface of the adjacent two flat tubes 10 close to each other is defined as h, h / 3≤e≤h. Further, when e=h, the flange plate 30 away from the end of the flat tube abuts against the side surface of the adjacent flat tube 10, and thus the overall structure of the heat exchanger 100 is more firm.

[0068] In addition, referring to FIG. 8, the flat tube 10 has a plurality of protrusions 110, the plurality of protrusions 110 extend along the thickness direction of the flat tube 10, and the plurality of protrusions 110 cooperatively form the first channel 112, the second channel 122, and the communication channel 13.

[0069] In some embodiments, referring to FIG. 8 and FIG. 9, the flat tube 10 includes a first plate 11 and a second plate 12, the first plate 11 is provided with a plurality of first protrusions 111 spaced from each other, the second plate 12 is provided with a plurality of second protrusions 121 spaced from each other, the first protrusions 111 and the second protrusions 121 are oppositely arranged to form the first channel 112, the second channel 122, and the communication channel 13, the first protrusions 111 and the second protrusions 121 extend reversely along the thickness direction of the flat tube 10, and the first protrusions 111 and the second protrusions 121 can play a spoiler role on the heat exchange medium flowing in the first channel 112, the second channel 122, and the communication channel 13, so that the heat exchange medium in the flat tube 10 is more uniform, heat concentration is avoided, and thus the heat exchange efficiency of the flat tube 10 and the fin 20 is improved.

[0070] Further, along the length direction Y of the first plate 11, projections of at least part of the first protrusions 111 in the width direction X of the first plate 11 are arranged not to overlap. Alternatively, along the length direction Y of the second plate 12, projections of at least part of the second protrusions 122 in the width direction X of the second plate 12 are arranged not to overlap. In this way, the heat exchange medium can be disturbed, and the heat exchange efficiency of the heat exchanger 100 can be improved.

[0071] Compared with the prior art, the application sets the flanging plate 30 at one end of the flat tube 10, and the abutting and limiting effect of the flanging plate 30 on the fin 20 avoids the problems of deformation and springing of the fin 20. Moreover, the relationship between the size of the flanging plate 30 and the size of the fin 20 is reasonably set, so that the flanging plate 30 can stably limit and abut the fin 20, will not hinder the discharge of condensed water on the fin 20, and also takes into account the problems of material consumption and cost.

[0072] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0073] The above-described embodiments only express several implementation manners of the present application, the description of the embodiments is more specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A heat exchanger, characterized by, The finned tube heat exchanger comprises a plurality of flat tubes and a plurality of fins, the flat tubes are arranged at intervals along the thickness direction of the flat tubes, and the fins are arranged between adjacent flat tubes. The flat tube is configured with a first channel, a second channel, and a communication channel connecting the first channel and the second channel, and the flat tube is provided with a limiting portion on one side edge close to the communication channel, and the limiting portion extends along the thickness direction of the flat tube.

2. The heat exchanger of claim 1, wherein, The limiting portion is a flange plate connected to the flat tube, and the flange plate extends along the thickness direction of the flat tube.

3. The heat exchanger of claim 2, wherein, The flange plate is a plurality of flange plates, and the plurality of flange plates are arranged at intervals along the width direction of the flat tube; and / or, the flange plate is a plurality of flange plates, and at least two flange plates extend reversely along the thickness direction of the flat tube.

4. The heat exchanger of claim 2, wherein, The flange plate extends along the thickness direction of the flat tube to at least one adjacent flat tube.

5. The heat exchanger of claim 2, wherein, The flange plates on the side of the adjacent two flat tubes close to each other extend reversely along the thickness direction of the flat tube, and are arranged staggered in the width direction of the flat tube.

6. The heat exchanger of claim 2, wherein, The flange plates on the side of the adjacent two flat tubes close to each other extend reversely along the thickness direction of the flat tube, and the flange plates of the adjacent two flat tubes have overlapping regions along the thickness direction of the flat tube; and / or, the flange plates on the side of the adjacent two flat tubes close to each other extend reversely along the thickness direction of the flat tube, and the flange plates of the adjacent two flat tubes have overlapping regions along the width direction of the flat tube.

7. The heat exchanger of claim 2, wherein, Both sides of the fin in the width direction are provided with a drainage port, the drainage port extends towards the center line of the fin in the width direction, and the projection of the drainage port and the flange plate on the fin does not overlap.

8. The heat exchanger of claim 7, wherein, The center line of the drainage port divides the fin into asymmetric first and second sections, the length of the first section is less than the length of the second section, along the length direction of the fin, the width of the drainage port is a, the flange plate is rectangular, and the length of the flange plate projected on the first section is n, the length of the first section is b, and b / 4≤n≤b-2 / a.

9. The heat exchanger of claim 8, wherein, The length of the flange plate projected on the second section is m, and m=n.

10. The heat exchanger of claim 8, wherein, The length of the fin is L, the width of the fin is H, the flange plate is rectangular, the length of the flange plate projected on the second section is m, the length of the fin is L, (L-b) / 4≤m≤L-b-a / 2, the width of the flange plate is d, and H / 4≤d≤H.

11. The heat exchanger of claim 2, wherein, The flange plate is triangular, and the length of the base of the flange plate is n; and / or, The flange plate is elliptical, and the major axis of the ellipse is n.

12. The heat exchanger of claim 1, wherein, The side surface of the fin close to the limiting portion abuts against each other.

13. The heat exchanger of claim 1, wherein, The flat tube has a plurality of protrusions, the protrusions extend along the thickness direction of the flat tube, and the protrusions cooperatively form the first channel, the second channel, and the communication channel.

14. The heat exchanger of claim 1, wherein, The flat tube comprises a first plate and a second plate, the first plate is provided with a plurality of first protrusions spaced from each other, the second plate is provided with a plurality of second protrusions spaced from each other, the first protrusions and the second protrusions are oppositely arranged to form first channels, second channels and communication channels, and the first protrusions and the second protrusions extend reversely along the thickness direction of the flat tube.

15. The heat exchanger of claim 14, wherein, Along the length direction of the first plate, the projections of at least part of the first protrusions in the width direction of the first plate are not arranged in overlapping manner; and / or, along the length direction of the second plate, the projections of at least part of the second protrusions in the width direction of the second plate are not arranged in overlapping manner.

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