Heat exchanger

Abstract

The utility model relates to the technical field of heat exchange, in particular to a heat exchanger. The heat exchanger comprises a fin and a flat tube, the fin comprises a fin body and a first limiting part, the fin body is provided with a slot, and the slot is provided with an opening at the edge of one side of the width of the fin body. Each slot comprises a flat tube groove used for installing a flat tube and a guide groove communicated with the flat tube groove, the guide groove is located in the edge of the width side of the fin body, and the thickness of the guide groove is gradually reduced in the direction from the guide groove to the flat tube groove. The first limiting parts are arranged at the ends, close to the guide grooves, of the flat pipe grooves, the first limiting parts protrude out of the inner walls of the flat pipe grooves and are connected with the fin body, the flat pipes are inserted into the flat pipe grooves, and one ends of the first limiting parts abut against the surfaces of the flat pipes and are in interference fit with the flat pipes. According to the heat exchanger, the problem that the heat exchange capacity of the heat exchanger can be reduced due to connection of existing fins and flat pipes is solved.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat exchanger. Background Art

[0002] The existing microchannel heat exchanger usually includes fins and flat tubes. The fins are provided with flat tube grooves. The flat tubes are inserted into the flat tube grooves and fixed to the fins by welding.

[0003] There are two common ways to connect fins and flat tubes. For example, multiple flat tubes are arranged first and then the fins are inserted, or multiple fins are arranged first and then the flat tubes are inserted. However, no matter which connection method is used, the fit between the flat tubes and the fins is mostly a clearance fit, which makes it easy to loosen during subsequent processing, and the gap between the fins and the flat tubes is easy to cause welding defects such as cold welding, which greatly affects the heat exchange capacity of the heat exchanger. Utility Model Content

[0004] Based on this, it is necessary to provide a heat exchanger to solve the problem that the connection between the existing fins and flat tubes will reduce the heat exchange capacity of the heat exchanger.

[0005] The present application provides a heat exchanger, which includes fins and flat tubes. The fins include a fin body and a first limiting portion. The fin body is provided with a slot, and the slot is provided with an opening at an edge of a width side of the fin body. The slot includes a flat tube groove for installing the flat tube and a guide groove connected to the flat tube groove. The guide groove is located at an edge of a width side of the fin body, and the thickness of the guide groove gradually decreases from the guide groove to the flat tube groove. The first limiting portion is provided at one end of the flat tube groove close to the guide groove, and the first limiting portion protrudes from the inner wall of the flat tube groove and is connected to the fin body. The flat tube is inserted into the flat tube groove, and one end of the first limiting portion abuts against the surface of the flat tube and is interference fit with the flat tube.

[0006] In one embodiment, the flat tube includes a straight segment and two arc segments connected to each other, the straight segment is located between the two arc segments, and the thickness of the arc segment gradually decreases along the width direction of the flat tube and from the straight segment to the arc segment, wherein one end of the first limiting portion abuts against the surface of the arc segment and has an interference fit with the arc segment.

[0007] In one embodiment, the number of the first limiting portion is one, and the first limiting portion is arranged on the side wall of the flat tube groove located below along the gravity direction; or, the number of the first limiting portion is two, and the two first limiting portions are relatively arranged on the two side walls of the flat tube groove along the thickness direction of the flat tube groove.

[0008] In one embodiment, along the thickness direction of the flat tube, the thickness H01 of the flat tube and the thickness H02 of the flat tube groove satisfy 0≤H02-H01≤0.2mm.

[0009] In one embodiment, there are two first limiting portions, which are relatively arranged on two side walls of the flat tube groove along its own thickness direction; one of the first limiting portions protrudes from the side wall of the flat tube groove by a height W01, and the other first limiting portion protrudes from the side wall of the flat tube groove by a height W02, satisfying 0.03mm≤W01+W02≤0.25mm.

[0010] In one embodiment, the first limiting portion includes a first side surface and a second side surface, the first side surface is arranged on a side of the second side surface close to the guide groove and is connected to the second side surface, wherein an angle formed by the first side surface relative to the side wall of the flat tube groove is smaller than an angle formed by the second side surface relative to the side wall of the flat tube groove.

[0011] In one of the embodiments, the fin further includes a second limiting portion, which is arranged on the side wall of the flat tube groove along its own circumference; a second matching portion is provided on the surface of the flat tube, and the second limiting portion and the second matching portion are snap-fitted.

[0012] In one embodiment, one of the second limiting portion and the second matching portion is configured as a protrusion, and the other is configured as a groove, and the protrusion is locked in the groove.

[0013] In one embodiment, the second matching parts are provided in plurality, and the plurality of second matching parts are arranged at intervals along the width direction of the flat tube, or are arranged opposite to each other along the thickness direction of the flat tube; wherein at least some of the grooves are arranged in one-to-one correspondence with the protrusions.

[0014] In one embodiment, along the thickness direction of the flat tube, the thickness H01 of the flat tube and the thickness H02 of the flat tube groove satisfy 0≤H02-H01≤0.2mm; wherein, the height W11 of the protrusion and the depth W21 of the groove satisfy 0.03mm≤W11-W21≤0.25mm, or, satisfy 0.03mm≤2(W11-W21)≤0.25mm.

[0015] Compared with the prior art, the heat exchanger provided by the present application, when the flat tube is installed in the flat tube groove, because the first limiting portion can be set against the surface of the flat tube and have an interference fit with the flat tube, the first limiting portion can achieve fixed clamping of the flat tube, preventing the flat tube from sliding out of the flat tube groove, thereby ensuring a firm connection between the flat tube and the fin, which is beneficial to subsequent welding, and thus effectively ensuring the heat exchange effect of the heat exchanger. In addition, by arranging the first limiting portion at the junction of the flat tube groove and the guide groove, it is less difficult for the flat tube to open the flat tube groove when it is inserted into the flat tube groove through the guide groove, which is beneficial to reducing the assembly difficulty of the flat tube and improving the assembly efficiency. At the same time, it can also reduce the deformation of the fin and avoid affecting the heat exchange effect of the fin. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic structural diagram of a heat exchanger according to an embodiment of the present application;

[0018] Figure 2 A schematic diagram of the structure of a fin according to an embodiment of the present application;

[0019] Figure 3 A schematic structural diagram of a first limiting portion of an embodiment provided in the present application;

[0020] Figure 4 A partial structural schematic diagram of a heat exchanger according to an embodiment of the present application;

[0021] Figure 5 A front view of a flat tube according to an embodiment of the present application;

[0022] Figure 6 A schematic structural diagram of a second limiting portion of an embodiment provided in the present application;

[0023] Figure 7 A front view of a flat tube according to another embodiment of the present application;

[0024] Figure 8 A schematic structural diagram of a second limiting portion of another embodiment provided by the present application;

[0025] Fig. 9 This is a schematic structural diagram of a second limiting portion of another embodiment provided in the present application.

[0026] The symbols in the figure mean the following:

[0027] 100, heat exchanger; 10, fin; 11, fin body; 111, slot; 1111, flat tube slot; 1112, guide slot; 112, drainage slot; 12, first limiting portion; 121, first side surface; 122, second side surface; 13, second limiting portion; 14, flange; 20, flat tube; 21, straight line segment; 22, arc segment; 23, second matching portion. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0033] The existing microchannel heat exchanger usually includes fins and flat tubes. The fins are provided with flat tube grooves. The flat tubes are inserted into the flat tube grooves and fixed to the fins by welding.

[0034] There are two common ways to connect fins and flat tubes. For example, multiple flat tubes are arranged first and then the fins are inserted, or multiple fins are arranged first and then the flat tubes are inserted. However, no matter which connection method is used, the fit between the flat tubes and the fins is mostly a clearance fit, which makes it easy to loosen during subsequent processing, and the gap between the fins and the flat tubes is easy to cause welding defects such as cold welding, which greatly affects the heat exchange capacity of the heat exchanger.

[0035] See also Figure 1-Figure 9 In order to solve the problem that the connection between the existing fins and flat tubes will reduce the heat exchange capacity of the heat exchanger, the present application provides a heat exchanger 100. The heat exchanger 100 includes a fin 10 and a flat tube 20. The fin 10 includes a fin body 11 and a first limiting portion 12. The fin body 11 is provided with a slot 111. The slot 111 is provided with an opening at the edge of the width side of the fin body 11. The slot 111 includes a flat tube groove 1111 for installing the flat tube 20 and a guide groove 1112 connected to the flat tube groove 1111. The guide groove 1112 is located at the edge of the width side of the fin body 11. From the guide groove 1112 to the flat tube groove 1111, the thickness of the guide groove 1112 gradually decreases. The first limiting portion 12 is disposed at one end of the flat tube groove 1111 close to the guide groove 1112, and the first limiting portion 12 protrudes from the inner wall of the flat tube groove 1111 and is connected to the fin body 11. The flat tube 20 is inserted into the flat tube groove 1111, and one end of the first limiting portion 12 abuts against the surface of the flat tube 20 and is interference fit with the flat tube 20.

[0036] It should be noted that the thickness direction of the flat tube groove 1111 , the thickness direction of the guide groove 1112 , the thickness direction of the flat tube 20 , and the thickness directions of the straight line segment 21 and the arc segment 22 on the flat tube 20 described below are all the same.

[0037] It is understandable that when the flat tube 20 is installed in the flat tube groove 1111, since the first limiting portion 12 can be set against the surface of the flat tube 20 and have an interference fit with the flat tube 20, the first limiting portion 12 can achieve fixed clamping of the flat tube 20, preventing the flat tube 20 from sliding out of the flat tube groove 1111, thereby ensuring a firm connection between the flat tube 20 and the fin 10, which is beneficial to subsequent welding, and thus effectively ensuring the heat exchange effect of the heat exchanger 100. In addition, by arranging the first limiting portion 12 at the junction of the flat tube groove 1111 and the guide groove 1112, it is easier for the flat tube 20 to open the flat tube groove 1111 when it passes through the guide groove 1112 and is inserted into the flat tube groove 1111, thereby reducing the difficulty of assembling the flat tube 20 and improving the assembly efficiency. At the same time, it can also reduce the deformation of the fin 10 and avoid affecting the heat exchange effect of the fin 10.

[0038] Furthermore, in one embodiment, the flat tube 20 includes a straight segment 21 and two arc segments 22 connected to each other, the straight segment 21 is located between the two arc segments 22, and the thickness of the arc segment 22 gradually decreases along the width direction of the flat tube 20 and from the straight segment 21 to the arc segment 22, wherein one end of the first limiting portion 12 abuts against the surface of the arc segment 22 and has an interference fit with the arc segment 22.

[0039] When the flat tube 20 is inserted into the flat tube groove 1111, one of the arc segments 22 is used as the insertion end, and the arc surface can play a good guiding role, further reducing the insertion difficulty of the flat tube 20. When the flat tube 20 is assembled with the flat tube groove 1111, the other arc segment 22 is abutted with the first limit portion 12. Since the thickness of the arc segment 22 is less than the thickness of the straight segment 21, and the first limit portion 12 and the arc segment 22 are abutted, the limit stop of the straight segment 21 is achieved, thereby effectively preventing the flat tube 20 from being separated from the flat tube groove 1111, which is beneficial to the subsequent welding process and further reduces the deformation probability of the fin 10. At the same time, there is no need to process the corresponding structure on the flat tube 20 to cooperate with the first limit portion 12, thereby greatly reducing the processing difficulty of the flat tube 20.

[0040] In one embodiment, if Figure 2 and Figure 3 As shown, the first limiting portion 12 includes a first side surface 121 and a second side surface 122, wherein the first side surface 121 is disposed on a side of the second side surface 122 close to the guide groove 1112 and connected to the second side surface 122, wherein an angle formed by the first side surface 121 relative to the side wall of the flat tube groove 1111 is smaller than an angle formed by the second side surface 122 relative to the side wall of the flat tube groove 1111.

[0041] Since the angle formed by the first side surface 121 is relatively small, the flat tube 20 can be inserted into the flat tube groove 1111 more smoothly along the guidance of the first side surface 121, further reducing the difficulty of inserting the flat tube 20. The angle formed by the second side surface 122 is relatively large, which can exert a greater resistance on the flat tube 20, thereby preventing the flat tube 20 from escaping from the flat tube groove 1111, further improving the limiting reliability of the first limiting portion 12.

[0042] Furthermore, the connection between the first side surface 121 and the second side surface 122 is smoothly transitioned to reduce contact wear between the first limiting portion 12 and the flat tube 20 , thereby improving the limiting reliability of the first limiting portion 12 .

[0043] In one embodiment, the number of the first limiting portion 12 is one, and along the gravity direction, the first limiting portion 12 is disposed on the side wall below the flat tube groove 1111. The abutment between the first limiting portion 12 and the flat tube 20 can effectively prevent the flat tube 20 from being close to the side wall below the flat tube groove 1111 under the action of gravity, so that the gap between the flat tube 20 and the flat tube groove 1111 can be reasonably adjusted, which is beneficial to the welding of the flat tube 20 and the fin 10, and improves the heat exchange effect of the heat exchanger 100.

[0044] In another embodiment, the number of the first limiting portions 12 is two, and the two first limiting portions 12 are relatively arranged on the two side walls of the flat tube groove 1111 along the thickness direction thereof. By providing two first limiting portions 12, the fixing effect of the first limiting portions 12 on the flat tube 20 can be further improved, and the distance between the flat tube 20 and the two side walls of the flat tube groove 1111 can be better controlled, thereby further improving the heat exchange effect.

[0045] It should be noted that the sizes of the two first limiting portions 12 can be set to be the same or different, and can be reasonably set according to actual gap requirements.

[0046] In order to reduce the difficulty of assembling the flat tube 20, in one embodiment, Figure 4 As shown, along the thickness direction of the flat tube 20, the thickness H01 of the flat tube 20 and the thickness H02 of the flat tube groove 1111 satisfy 0≤H02-H01≤0.2mm. That is, the flat tube 20 and the flat tube groove 1111 of this embodiment are clearance fit, so that when the flat tube 20 is inserted into the flat tube groove 1111, only the straight section 21 of the flat tube 20 and the first limit portion 12 are in interference, thereby reducing the interference contact area and reducing the risk of deformation of the fin 10. Among them, by reasonably setting the distance between the flat tube 20 and the side wall of the flat tube groove 1111, it can also play a role in reducing the difficulty of assembly and ensuring the heat exchange effect.

[0047] Specifically, if H02-H01>0.2mm, the distance between the flat tube 20 and the side wall of the flat tube groove 1111 is too large, which is not conducive to the welding between the flat tube 20 and the fin 10, and welding defects are easily generated, thereby affecting the heat exchange effect of the heat exchanger 100. If H02-H01<0, the flat tube 20 and the flat tube groove 1111 are interference fit, which greatly increases the difficulty of assembling the flat tube 20.

[0048] Among them, the value of H02-H01 can be 0.05mm, 0.1mm, 0.15mm or 0.2mm, etc., which are not listed here one by one.

[0049] Further, the present application specifically takes the provision of two first limiting portions 12 as an example for explanation. Specifically, in one embodiment, Figure 4 As shown, one of the first limiting portions 12 protrudes from the side wall of the flat tube groove 1111 by a height W01, and the other first limiting portion 12 protrudes from the side wall of the flat tube groove 1111 by a height W02, satisfying 0.03mm≤W01+W02≤0.25mm. In this way, the fixing and limiting effect of the first limiting portion 12 on the flat tube 20 can be ensured, and the deformation of the fin 10 can be avoided. If the total height value of the two first limiting portions 12 is large, the assembly between the first limiting portion 12 and the flat tube 20 is tighter, so that the fin 10 is subjected to excessive force and is prone to deformation. If the total height value of the two first limiting portions 12 is small, the limiting effect of the first limiting portion 12 on the flat tube 20 is weakened, and there is a risk that the flat tube 20 will be separated from the flat tube groove 1111.

[0050] Exemplarily, the value of W01+W02 can be 0.03 mm, 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm or 0.25 mm, etc., and can be reasonably set according to actual needs.

[0051] In order to further improve the firmness of the connection between the flat tube 20 and the flat tube groove 1111, as Figure 5-Figure 9 As shown, in one embodiment, the fin 10 further includes a second limiting portion 13, which is disposed on the side wall of the flat tube groove 1111 along its own circumference. A second matching portion 23 is disposed on the surface of the flat tube 20, and the second limiting portion 13 and the second matching portion 23 are engaged with each other.

[0052] Furthermore, in one embodiment, one of the second position limiting portion 13 and the second matching portion 23 is configured as a protrusion, and the other is configured as a groove, and the protrusion is clamped in the groove. In this way, the second position limiting portion 13 and the second matching portion 23 have simple structures, which can reduce the difficulty of processing.

[0053] Specifically, in one embodiment, the protrusion is in a hemispherical or long strip shape, and the groove is in a long strip shape. Since a flat tube 20 usually needs to be matched with multiple fins 10, this embodiment can reduce the difficulty of matching the protrusion and the groove by setting the groove in a long strip shape, thereby improving the assembly efficiency of the flat tube 20.

[0054] Furthermore, in one embodiment, the second matching portion 23 is provided in plurality, and the plurality of second matching portions 23 are arranged at intervals along the width direction of the flat tube 20, or are arranged relatively along the thickness direction of the flat tube 20. Among them, at least some of the grooves are arranged in a one-to-one correspondence with the protrusions. That is, in this embodiment, the number of grooves is greater than or equal to the number of protrusions, which can not only achieve the corresponding matching of the protrusions and the grooves, but also further reduce the difficulty of inserting the flat tube 20 when more grooves are provided. In addition, the provision of a plurality of protrusions and grooves for matching and snapping can also further enhance the fixing effect of the flat tube 20, and can better control the distance from the flat tube 20 to the two side walls of the flat tube groove 1111, thereby further improving the heat exchange effect.

[0055] In one embodiment, if Figure 5 and Figure 6 As shown, taking the second matching portion 23 as a protrusion, the second limiting portion 13 as a groove, and the second matching portion 23 being relatively arranged on the two side walls of the flat tube 20 along its own thickness direction as an example, at this time, the height W11 of the protrusion and the depth W21 of the groove satisfy 0.03mm≤2(W11-W21)≤0.25mm. In this way, it is possible to ensure the fixed limiting effect of the flat tube 20 and avoid large deformation of the fin 10. If the difference between the total height value of the two protrusions and the total depth value of the two grooves is large, the protrusion will exert a greater force on the fin 10, which may easily cause the fin 10 to deform. If the difference between the total height value of the two protrusions and the total depth value of the two grooves is small, the matching effect between the flat tube 20 and the fin 10 is weakened, and there is a risk that the flat tube 20 will be separated from the flat tube groove 1111.

[0056] Exemplarily, the value of 2(W11-W21) can be 0.03mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm or 0.25mm, etc., and can be reasonably set according to actual needs.

[0057] In another embodiment, if Figure 7 , Figure 8 and Fig. 9As shown, taking the second matching portion 23 as a groove, the second limiting portion 13 as a protrusion, and the second matching portion 23 as an example, the flat tube 20 is provided on one side along the thickness direction thereof. At this time, the height W11 of the protrusion and the depth W21 of the groove satisfy 0.03mm≤W11-W21≤0.25mm. In this way, the fixed limiting effect of the flat tube 20 can be ensured, and the fin 10 can be prevented from being deformed significantly. If the difference between the height value of the protrusion and the depth value of the groove is large, the flat tube 20 will exert a greater force on the fin 10, which may easily cause the fin 10 to deform. If the difference between the height value of the protrusion and the depth value of the groove is small, the matching effect between the flat tube 20 and the fin 10 is weakened, and there is a risk that the flat tube 20 will be separated from the flat tube groove 1111.

[0058] Exemplarily, at this time, the value of W11-W21 can be 0.03mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm or 0.25mm, etc., and can be reasonably set according to actual needs.

[0059] When the second matching portion 23 is only provided on one side, it is similar to the arrangement of a single first limiting portion 12 and is preferably provided at the bottom along the gravity direction.

[0060] In one embodiment, if Figure 1 and Figure 2 As shown, the fin 10 further includes a flange 14, which is disposed around the circumference of the flat tube groove 1111, and the flange 14 is perpendicular to the fin body 11. The flange 14 can improve the connection strength between the fin 10 and the flat tube 20, and can also be used to position multiple fins 10 when arranged, which is beneficial to control the spacing between adjacent fins 10, thereby improving the overall assembly efficiency of the heat exchanger 100.

[0061] Specifically, the first limiting portion 12 and the second limiting portion 13 of the present application may both extend onto the flange 14 to improve the limiting reliability of the first limiting portion 12 and the second limiting portion 13 .

[0062] Furthermore, in one embodiment, the fin body 11 is provided with a drainage groove 112, which is provided on a side of the fin body 11 away from the guide groove 1112 and extends along the length direction of the fin body 11. The drainage groove 112 is used to discharge condensed water to prevent condensed water from accumulating on the fin 10, which is beneficial to improving the heat exchange effect of the heat exchanger 100.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A heat exchanger, characterized in that: The invention comprises a fin (10) and a flat tube (20), wherein the fin (10) comprises a fin body (11) and a first limiting portion (12), wherein the fin body (11) is provided with a slot (111), wherein the slot (111) is provided with an opening at an edge of a width side of the fin body (11), wherein the slot (111) comprises a flat tube slot (1111) for mounting the flat tube (20) and a guide slot (1112) connected to the flat tube slot (1111), wherein the guide slot (1112) is located at an edge of a width side of the fin body (11), and the thickness of the guide slot (1112) gradually decreases in a direction from the guide slot (1112) to the flat tube slot (1111); The first limiting portion (12) is arranged at one end of the flat tube groove (1111) close to the guide groove (1112), and the first limiting portion (12) protrudes from the inner wall of the flat tube groove (1111) and is connected to the fin body (11); the flat tube (20) is inserted into the flat tube groove (1111), and one end of the first limiting portion (12) abuts against the surface of the flat tube (20) and is interference fit with the flat tube (20).

2. The heat exchanger according to claim 1, characterized in that: The flat tube (20) comprises a straight section (21) and two arc sections (22) connected to each other, the straight section (21) is located between the two arc sections (22), and along the width direction of the flat tube (20), and in the direction from the straight section (21) to the arc section (22), the thickness of the arc section (22) gradually decreases, wherein one end of the first limiting portion (12) abuts against the surface of the arc section (22) and is interference fit with the arc section (22).

3. The heat exchanger according to claim 1, characterized in that: The number of the first limiting portion (12) is one, and along the gravity direction, the first limiting portion (12) is arranged on the side wall of the flat tube groove (1111) located below; Alternatively, the number of the first limiting portions (12) is two, and the two first limiting portions (12) are arranged oppositely on two side walls of the flat tube groove (1111) along its own thickness direction.

4. The heat exchanger according to claim 1, characterized in that: Along the thickness direction of the flat tube (20), the thickness H01 of the flat tube (20) and the thickness H02 of the flat tube groove (1111) satisfy 0≤H02-H01≤0.2 mm.

5. The heat exchanger according to claim 4, characterized in that: The number of the first limiting portions (12) is two, and the two first limiting portions (12) are arranged oppositely on two side walls of the flat tube groove (1111) along the thickness direction of the flat tube groove (1111); One of the first limiting portions (12) protrudes from the side wall of the flat tube groove (1111) by a height W01, and the other of the first limiting portions (12) protrudes from the side wall of the flat tube groove (1111) by a height W02, satisfying 0.03mm≤W01+W02≤0.25mm.

6. The heat exchanger according to claim 1, characterized in that The first limiting portion (12) comprises a first side surface (121) and a second side surface (122), wherein the first side surface (121) is arranged on a side of the second side surface (122) close to the guide groove (1112) and connected to the second side surface (122), wherein an angle formed by the first side surface (121) relative to a side wall of the flat tube groove (1111) is smaller than an angle formed by the second side surface (122) relative to the side wall of the flat tube groove (1111).

7. The heat exchanger according to any one of claims 1 to 6, characterized in that: The fin (10) further comprises a second limiting portion (13), wherein the second limiting portion (13) is arranged on a side wall of the flat tube groove (1111) along its own circumferential direction; A second matching portion (23) is provided on the surface of the flat tube (20), and the second limiting portion (13) and the second matching portion (23) are snap-fitted.

8. The heat exchanger according to claim 7, characterized in that One of the second limiting portion (13) and the second matching portion (23) is configured as a protrusion, and the other is configured as a groove, and the protrusion is locked in the groove.

9. The heat exchanger according to claim 8, characterized in that The second matching portion (23) is provided in plurality, and the plurality of second matching portions (23) are arranged at intervals along the width direction of the flat tube (20), or are arranged opposite to each other along the thickness direction of the flat tube (20); Wherein, at least part of the grooves are arranged in one-to-one correspondence with the protrusions.

10. The heat exchanger according to claim 9, characterized in that The height W11 of the protrusion and the depth W21 of the groove satisfy 0.03mm≤W11-W21≤0.25mm, or satisfy 0.03mm≤2(W11-W21)≤0.25mm.

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