Adapter pipe and microchannel heat exchanger thereof

Abstract

The present application relates to the field of refrigeration technology, in particular to a adapter pipe and micro-channel heat exchanger thereof. The adapter pipe is installed in the micro-channel heat exchanger and used for connecting the flat tube. The adapter pipe has a first pipe opening matched with the flat tube, the first pipe opening is used for inserting the flat tube, and the inner wall of the adapter pipe is provided with a limiting portion abutting against one end of the flat tube and / or the side wall of the flat tube for limiting the flat tube. The present application also provides a micro-channel heat exchanger comprising the adapter pipe. Compared with the prior art, the present application has the advantages that: by making the limiting portion abutting against one end of the flat tube and / or the side wall of the flat tube for limiting the flat tube, the connection between the flat tube and the adapter pipe is ensured to be fixed, and then the flat tube and the adapter pipe will not be displaced during the welding process, and the welding performance of the flat tube and the adapter pipe is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration technology, in particular to a adapter pipe and a micro-channel heat exchanger thereof. BACKGROUND

[0002] The micro-channel heat exchanger is a kind of compact, light and efficient heat exchanger designed to meet the needs of industrial development.

[0003] In the existing micro-channel heat exchanger, the connection between the flat tube and the adapter pipe is usually not provided with a limiting structure, so that the flat tube and the adapter pipe are not convenient to weld, and the flat tube and the adapter pipe are displaced during welding, thereby affecting the welding quality. SUMMARY

[0004] Therefore, it is necessary to provide an adapter pipe and a micro-channel heat exchanger thereof capable of enhancing the welding performance.

[0005] An adapter pipe is installed in a micro-channel heat exchanger and used for connecting a flat tube, the adapter pipe has a first pipe opening matched with the flat tube, the first pipe opening is used for inserting the flat tube, and an inner wall of the adapter pipe is provided with a limiting portion abutting against one end of the flat tube and / or abutting against a side wall of the flat tube and used for limiting the flat tube.

[0006] It can be understood that the limiting portion abuts against one end of the flat tube and / or abutting against the side wall of the flat tube, so as to axially limit and / or radially limit the flat tube, so that the flat tube and the adapter pipe will not be displaced during welding, thereby facilitating welding.

[0007] In one embodiment, the limiting portion includes a first protrusion and a second protrusion, the first protrusion and the second protrusion are arranged at intervals along the length direction of the adapter pipe, the first protrusion is arranged away from the first pipe opening relative to the second protrusion, the height of the first protrusion protruding from the inner wall of the adapter pipe is greater than the height of the second protrusion protruding from the inner wall of the adapter pipe, the first protrusion is used for abutting against one end of the flat tube, and the second protrusion is used for abutting against the outer side wall of the flat tube.

[0008] It can be understood that the limiting portion includes the first protrusion and the second protrusion, the first protrusion is used for abutting against one end of the flat tube, and the second protrusion is used for abutting against the outer side wall of the flat tube, so as to limit the depth of the flat tube inserted into the adapter pipe and the shaking of the flat tube in the adapter pipe, thereby further ensuring the connection stability between the flat tube and the adapter pipe and facilitating welding.

[0009] In one of the embodiments, the height of the second protrusion protruding relative to the inner wall of the adapter pipe is H4, the height of the flat pipe is H1, the adapter pipe has oppositely arranged first and second inner walls, the second protrusion is arranged on the first and / or second inner wall, the distance between the first and second inner walls is H2, and 0mm≤[H4-(H2-H1)]≤0.2mm.

[0010] It can be understood that by satisfying the relationship 0mm≤[H4-(H2-H1)]≤0.2mm for the height H1 of the flat pipe, the height H4 of the second protrusion protruding relative to the inner wall of the adapter pipe, and the distance H2 between the first and second inner walls, the interference fit between the second protrusion and the flat pipe is ensured, and the second protrusion further limits the flat pipe in the radial direction.

[0011] In one of the embodiments, the first protrusion is semicircular, square or trapezoidal, and / or the second protrusion is semicircular, square or trapezoidal.

[0012] In one of the embodiments, the height of the first protrusion protruding relative to the inner wall of the adapter pipe is H3, the height of the flat pipe is H1, the adapter pipe has oppositely arranged first and second inner walls, the first protrusion is arranged on the first and / or second inner wall, the distance between the first and second inner walls is H2, and the height of the flat pipe is H1, 0.2mm≤[H3-(H2-H1)]≤3mm.

[0013] It can be understood that by satisfying the relationship 0.2mm≤[H3-(H2-H1)]≤3mm for the height H3 of the first protrusion protruding relative to the inner wall of the adapter pipe, the height H1 of the flat pipe, and the distance H2 between the first and second inner walls, the height H3 of the first protrusion protruding relative to the inner wall of the adapter pipe is within a suitable range, which can ensure the limitation of the end surface of the flat pipe and avoid excessive H3 causing excessive flow resistance of the medium.

[0014] In one of the embodiments, the distance between the first protrusion and the end surface of the first pipe opening is L1, and 2mm≤L1≤10mm.

[0015] It can be understood that by satisfying the relationship 2mm≤L1≤10mm for the distance L1 between the first protrusion and the end surface of the first pipe opening, the depth of the flat pipe inserted into the adapter pipe is within a suitable range, which can avoid excessive insertion of the flat pipe causing flow resistance and can avoid insufficient insertion of the flat pipe reducing the welding strength.

[0016] In one of the embodiments, the height of the flat tube is H1, the adapter tube has oppositely arranged first and second inner walls, the distance between the first and second inner walls is H2, and 0.02mm≤(H2-H1)≤0.4mm.

[0017] It can be understood that by making the height H1 of the flat tube and the distance H2 between the first and second inner walls satisfy the relationship 0.02mm≤(H2-H1)≤0.4mm, the clearance between the outer wall of the flat tube and the inner wall of the adapter tube is formed, which is beneficial to the flow of the solder.

[0018] In one of the embodiments, the adapter tube has a second tube opening at the end away from the first tube opening, and the second tube opening is circular; or the adapter tube is a bent tube, and both ends of the adapter tube have the first tube opening.

[0019] The present application also provides the following technical solutions:

[0020] A micro-channel heat exchanger includes a flat tube, a distributor, and a plurality of adapter tubes, the distributor is provided with a plurality of capillary tubes, one end of part of the adapter tubes is connected to the capillary tubes, the other end is connected to the flat tube, and both ends of part of the adapter tubes are connected to the flat tube.

[0021] In one of the embodiments, the micro-channel heat exchanger further includes a plurality of fins arranged side by side, the fins are provided with plug-in slots, a plurality of flat tubes are arranged in parallel to form multiple layers, and the flat tubes are arranged in the plug-in slots; the fins are arranged in multiple rows, each row of fins includes a plurality of plug-in slots arranged at intervals, and the plug-in slots on the same column of fins are arranged alternately along the height direction of the micro-channel heat exchanger.

[0022] Compared with the prior art, the present application makes the limiting part abut against one end of the flat tube and / or the side wall of the flat tube, so as to limit the flat tube, thereby ensuring the connection stability between the flat tube and the adapter tube, and preventing the flat tube and the adapter tube from being displaced during welding, thereby facilitating welding. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 The structure diagram of the adapter tube provided by the present application is shown in the following figure:

[0025] Figure 2 Structure diagram of an embodiment of the adapter pipe and the flat pipe connection provided by the present application;

[0026] Figure 3 Figure 2 Partial enlarged view at A in the middle;

[0027] Figure 4 Structure diagram of another embodiment of the adapter pipe and the flat pipe connection provided by the present application;

[0028] Figure 5 Structure diagram of the micro-channel heat exchanger provided by the present application. Figure 4 Partial enlarged view at B in the middle;

[0029] Figure 6 Structure diagram of the micro-channel heat exchanger provided by the present application.

[0030] The meanings of the symbols in the figures are as follows:

[0031] 100, micro-channel heat exchanger; 10, adapter pipe; 11, first pipe opening; 12, limiting part; 121, first protrusion; 122, second protrusion; 13, first inner wall; 14, second inner wall; 15, second pipe opening; 20, flat pipe; 30, distributor; 31, capillary tube; 40, fin; 41, plug-in slot; 50, header. DETAILED DESCRIPTION

[0032] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0033] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in the specification of the present application are for the purpose of illustration only and do not represent the only implementation.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0037] Please see Figures 1 to 6 The present invention provides a transfer tube 10, which is installed in a microchannel heat exchanger 100. The transfer tube 10 is used to connect adjacent flat tubes 20, or the transfer tube 10 is used to connect flat tubes 20 and capillary tubes 31. The microchannel heat exchanger 100 is installed in a refrigeration system, and a medium flows in the microchannel heat exchanger 100. The microchannel heat exchanger 100 assists the medium in exchanging heat with the outside world.

[0038] In existing microchannel heat exchangers, the connection between the flat tube and the adapter tube usually does not have a limiting structure. This not only makes it difficult to weld the flat tube and the adapter tube, but also causes the flat tube and the adapter tube to shift during the welding process, which causes inconvenience to the welding.

[0039] To address the problems existing in current microchannel heat exchangers, the present invention provides a transfer tube 10 installed in a microchannel heat exchanger 100. The transfer tube 10 is used to connect a flat tube 20. The transfer tube 10 has a first port 11 adapted to the flat tube 20 for insertion. The inner wall of the transfer tube 10 is provided with a limiting part 12, which abuts against one end of the flat tube 20 and / or against the side wall of the flat tube 20 to limit the flat tube 20.

[0040] It should be noted that when it is necessary to connect adjacent flat tubes 20, or when it is necessary to connect the flat tube 20 and the capillary tube 31, each flat tube 20 is inserted into each adapter tube 10 one by one, and then welded integrally, therefore, in order to avoid displacement between the flat tube 20 and the adapter tube 10 during welding, the limiting portion 12 for limiting the flat tube 20 is arranged on the inner wall of the adapter tube 10.

[0041] In order to ensure the connection and fixation between the flat tube 20 and the adapter tube 10 before welding, the limiting portion 12 needs to limit the depth of the flat tube 20 inserted into the adapter tube 10 along the axis direction of the flat tube 20, and also needs to limit the shaking of the flat tube 20 in the adapter tube 10 along the direction perpendicular to the axis direction of the flat tube 20.

[0042] As shown in Figure 1 and Figure 2 , in an embodiment of the present application, the limiting portion 12 includes a first protrusion 121, the first protrusion 121 is arranged on the inner wall of the adapter tube 10 and extends towards the direction away from the inner wall of the adapter tube 10, the first protrusion 121 is used for abutting one end of the flat tube 20, so that the end face of the flat tube 20 inserted into the adapter tube 10 can abut on the first protrusion 121, thereby limiting the insertion depth of the flat tube 20 in the adapter tube 10.

[0043] Specifically, please refer to Figure 2 and Figure 3 , the protruding height of the first protrusion 121 relative to the inner wall of the adapter tube 10 cannot be too large or too small, and needs to be set within a suitable range. The height of the first protrusion 121 protruding relative to the inner wall of the adapter tube 10 is defined as H3, the height of the flat tube 20 is H1, the adapter tube 10 has a first inner wall 13 and a second inner wall 14 arranged oppositely, the first protrusion 121 is arranged on the first inner wall 13 and / or the second inner wall 14, the distance between the first inner wall 13 and the second inner wall 14 is H2, and the height of the flat tube 20 is H1; wherein the height H3 of the first protrusion 121 protruding relative to the inner wall of the adapter tube 10, the height H1 of the flat tube 20, and the distance H2 between the first inner wall 13 and the second inner wall 14 satisfy the relationship 0.2mm≤[H3-(H2-H1)]≤3mm. That is, the value of [H3-(H2-H1)] can be 0.2mm, 1mm, 2mm, 3mm or any value falling within the range. The height H1 of the flat tube 20 is the external height of the flat tube 20, not the height of the internal passage of the flat tube 20.

[0044] It should be noted that if the height H3 of the first protrusion 121 protruding relative to the inner wall of the adapter pipe 10 is too large, the first protrusion 121 will hinder the flow of the medium in the adapter pipe 10 to some extent, and even cause throttling; if the height H3 of the first protrusion 121 protruding relative to the inner wall of the adapter pipe 10 is too small, the limiting function cannot be achieved; therefore, the height H3 of the first protrusion 121 protruding relative to the inner wall of the adapter pipe 10 is in a suitable range, so that it can not only ensure the limiting of the end surface of the flat pipe 20, but also avoid that the height H3 is too high to cause too large flow resistance of the medium.

[0045] The number of the first protrusions 121 along the circumferential direction of the inner wall of the adapter pipe 10 can be one, two, three or more, and the number of the first protrusions 121 is not limited herein.

[0046] Optionally, in the embodiment, the shape of the first protrusion 121 can be semicircular, square or trapezoidal, and is not limited herein.

[0047] In addition, in the embodiment, the position of the first protrusion 121 on the inner wall of the adapter pipe 10 is actually equivalent to the maximum position of the flat pipe 20 inserted into the adapter pipe 10, and the depth of the flat pipe 20 inserted into the adapter pipe 10 also needs to be in a suitable range. The distance between the first protrusion 121 and the end surface of the first pipe opening 11, i.e. the depth of the flat pipe 20 inserted into the adapter pipe 10, is defined as L1, which satisfies the relationship 2mm≤L1≤10mm. That is, the distance L1 between the first protrusion 121 and the end surface of the first pipe opening 11 can be 2mm, 4mm, 6mm, 8mm, 10mm or any value falling within the range, and is not limited herein.

[0048] It should be noted that if the depth L1 of the flat pipe 20 inserted into the adapter pipe 10 is too large, the flow of the internal medium will be hindered to some extent; if the depth L1 of the flat pipe 20 inserted into the adapter pipe 10 is too small, the contact area between the flat pipe 20 and the adapter pipe 10 will be reduced, thereby reducing the welding strength therebetween. Therefore, by making the distance L1 between the first protrusion 121 and the end surface of the first pipe opening 11 satisfy the relationship 2mm≤L1≤10mm, the depth of the flat pipe 20 inserted into the adapter pipe 10 is in a suitable range, so that the flow hindering caused by the flat pipe 20 inserted too deeply can be avoided, and the welding strength can be reduced by the flat pipe 20 inserted too shallowly.

[0049] As Figure 1 and Figure 4As shown, in an embodiment, the limiting portion 12 comprises a second protrusion 122, which is arranged on the inner wall of the adapter pipe 10 and extends towards the direction away from the inner wall of the adapter pipe 10. The second protrusion 122 is arranged close to the first pipe opening 11 relative to the first protrusion 121, and the height of the second protrusion 122 protruding from the inner wall of the adapter pipe 10 is less than the height of the first protrusion 121 protruding from the inner wall of the adapter pipe 10. The second protrusion 122 is used to abut against the outer side wall of the flat pipe 20, mainly to avoid the flat pipe 20 from shaking relative to the inner wall of the adapter pipe 10.

[0050] Specifically, referring to Figure 4 and Figure 5 , in order to ensure the limiting effect of the second protrusion 122 on the flat pipe 20, the second protrusion 122 needs to be in interference fit with the outer side wall of the flat pipe 20. The height of the second protrusion 122 protruding from the inner wall of the adapter pipe 10 is defined as H4, the second protrusion 122 is arranged on the first inner wall 13 and / or the second inner wall 14, the height of the flat pipe 20 is H1, the height of the second protrusion 122 protruding from the inner wall of the adapter pipe 10 is H4, and the distance between the first inner wall 13 and the second inner wall 14 is H2, which satisfy the relationship 0mm≤[H4-(H2-H1)]≤0.2mm. That is, [H4-(H2-H1)] can be 0mm, 0.1mm, 0.2mm or any value falling within the range.

[0051] It should be noted that by making the height of the flat pipe 20 H1, the height of the second protrusion 122 protruding from the inner wall of the adapter pipe 10 H4, and the distance between the first inner wall 13 and the second inner wall 14 H2 satisfy the relationship 0mm≤[H4-(H2-H1)]≤0.2mm, the second protrusion 122 and the flat pipe 20 are in interference fit, and the second protrusion 122 fixes the flat pipe 20 in the adapter pipe 10, thereby solving the problem of displacement of the flat pipe 20 during welding with the adapter pipe 10.

[0052] Along the circumferential direction or the axial direction of the inner wall of the adapter pipe 10, the number of the second protrusions 122 can be one, two, three or more, which is not limited herein.

[0053] Optionally, in the embodiment, the shape of the second protrusion 122 can be semicircular, square or trapezoidal, which is not limited herein.

[0054] It should be noted that in the embodiment, only the first protrusion 121 or the second protrusion 122 can be arranged on the inner wall of the adapter pipe 10, and of course, the first protrusion 121 and the second protrusion 122 can be arranged at the same time. The first protrusion 121 and the second protrusion 122 can be formed by pressure processing on the outer wall of the adapter pipe 10.

[0055] In order to ensure the welding strength between the flat tube 20 and the adapter pipe 10, a gap is needed between the inner wall of the adapter pipe 10 and the outer wall of the flat tube 20 for the penetration of the molten solder, and the size of the gap needs to be within a suitable range. The height H1 of the flat tube 20 and the distance H2 between the first inner wall 13 and the second inner wall 14 satisfy the relationship 0.02mm≤(H2-H1)≤0.4mm, that is, the value of (H2-H1) can be 0.02mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or any value within the range.

[0056] It should be noted that the gap between the inner wall of the adapter pipe 10 and the outer wall of the flat tube 20 cannot be too small, which will cause the solder to fail to flow; the gap between the inner wall of the adapter pipe 10 and the outer wall of the flat tube 20 cannot be too large, which will cause the adapter pipe 10 and the flat tube 20 to fail to be welded. By making the height H1 of the flat tube 20 and the distance H2 between the first inner wall 13 and the second inner wall 14 satisfy the relationship 0.02mm≤(H2-H1)≤0.4mm, the gap between the outer wall of the flat tube 20 and the inner wall of the adapter pipe 10 is matched, which is conducive to the flow of the solder.

[0057] Further, in an embodiment of the present application, the adapter pipe 10 has a second pipe opening 15, which is located at the end of the adapter pipe 10 away from the first pipe opening 11, and the second pipe opening 15 is circular. The second pipe opening 15 is used to connect the capillary tube 31. Since the capillary tube 31 is particularly thin and has a circular cross section, and the cross section of the flat tube 20 is a strip-shaped hole, the two cannot be directly connected, and the connection between the two needs to be realized through the adapter of the adapter pipe 10. The end of the adapter pipe 10 close to the capillary tube 31 is set to be circular to match the capillary tube 31, and the end of the adapter pipe 10 close to the flat tube 20 is set to be long and strip-shaped to match the flat tube 20.

[0058] In another embodiment of the present application, in the multi-row micro-channel heat exchanger 100, the adapter pipe 10 is a bent pipe, and both ends of the adapter pipe 10 have the first pipe opening 11, which is used to connect the adjacent flat tubes 20. Since the existing micro-channel heat exchanger usually bends the flat tube to realize the multi-row flat tube, the bending of the flat tube will cause damage to the flat tube, and the large bending radius will increase the overall volume of the micro-channel heat exchanger, and in the bending process, the deformation of the fins will affect the heat exchange efficiency. Therefore, the adapter pipe 10 is used to connect the adjacent flat tubes 20, so as to avoid the deformation of the fins 40 caused by the bending. When both ends of the adapter pipe 10 are connected to the flat tube 20, the first protrusion 121 and the second protrusion 122 are arranged at both ends of the adapter pipe 10.

[0059] The adapter pipe 10 provided by the present application is used for limiting the flat pipe 20 by abutting the limiting part 12 against one end of the flat pipe 20 and / or the side wall of the flat pipe 20, so as to ensure the connection stability between the flat pipe 20 and the adapter pipe 10, and further to prevent the flat pipe 20 from being displaced during the welding process, and to enhance the welding performance of the flat pipe 20 and the adapter pipe 10.

[0060] As shown in Figure 6 the present application also provides the following technical solutions:

[0061] A micro-channel heat exchanger 100 comprises the flat pipe 20, the distributor 30 and the above-mentioned adapter pipe 10, the adapter pipe 10 is multiple, the distributor 30 is provided with multiple capillary tubes 31, one end of part of the adapter pipe 10 is connected to the capillary tube 31, and the other end is connected to the flat pipe 20, and both ends of part of the adapter pipe 10 are connected to the flat pipe 20. That is to say, the adapter pipe 10 connected to the capillary adopts the structure that the pipe opening at one end is circular, and the pipe opening at the other end is long-hole-shaped, and the adapter pipe 10 connected to the flat pipe 20 at both ends adopts the above-mentioned elbow structure.

[0062] Further, the micro-channel heat exchanger 100 further comprises multiple fins 40, the multiple fins 40 are arranged side by side, the fin 40 is provided with the adapter slot 41, the multiple flat pipes 20 are arranged in parallel to form multiple layers, and the flat pipe 20 is arranged in the adapter slot 41; the fin 40 is multiple rows, each row of the fin 40 comprises multiple columns of the adapter slot 41 arranged at intervals, and the adapter slots 41 on the same column of the fin 40 are arranged staggeredly along the height direction of the micro-channel heat exchanger 100.

[0063] It should be noted that the adapter slots 41 on the fin 40 are arranged staggeredly, so that the flat pipes 20 arranged in the adapter slots 41 are arranged staggeredly, and further to improve the heat exchange area of the flat pipe 20, so as to improve the heat exchange capacity of the micro-channel heat exchanger 100.

[0064] The micro-channel heat exchanger 100 further comprises a collecting pipe 50, the collecting pipe 50 is connected to the outlet of the flat pipe 20, and is used for collecting the medium.

[0065] When the flat pipes 20 of the micro-channel heat exchanger 100 are multiple single rows, one end of the flat pipe 20 is connected to the distributor 30 through the adapter pipe 10 and the capillary tube 31, and the other end is connected to the collecting pipe 50; when the flat pipes 20 of the micro-channel heat exchanger 100 are multiple rows, one end of the first row of flat pipes 20 is connected to the distributor 30 through the adapter pipe 10 and the capillary tube 31, and the other end is connected to the adapter pipe 10, and the outlet of the last row of flat pipes 20 is connected to the collecting pipe 50.

[0066] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0067] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent application scope. It shall be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. A connecting pipe, installed in a microchannel heat exchanger, for connecting a flat tube (20). Its features are, The adapter has a first port (11) adapted to the flat tube (20), the first port (11) for the flat tube (20) to be inserted, and the inner wall of the adapter is provided with a limiting part (12), the limiting part (12) abutting against one end of the flat tube (20) and / or against the side wall of the flat tube (20) for limiting the flat tube (20); the limiting part (12) includes a first protrusion (121) and a second protrusion (122), the first protrusion (121) and the second protrusion... The first protrusion (121) is positioned away from the first opening (11) relative to the second protrusion (122) along the length of the adapter pipe. The height of the first protrusion (121) protruding from the inner wall of the adapter pipe is greater than the height of the second protrusion (122) protruding from the inner wall of the adapter pipe. The first protrusion (121) is used to abut against one end of the flat tube (20), and the second protrusion (122) is used to abut against the outer wall of the flat tube (20).

2. The adapter pipe according to claim 1, characterized in that, The second protrusion (122) protrudes at a height of H4 relative to the inner wall of the adapter tube, and the height of the flat tube (20) is H1. The adapter tube has a first inner wall (13) and a second inner wall (14) disposed opposite to each other. The second protrusion (122) is disposed on the first inner wall (13) and / or the second inner wall (14). The distance between the first inner wall (13) and the second inner wall (14) is H2, and 0mm≤[H4-(H2-H1)]≤0.2mm.

3. The adapter pipe according to claim 1, characterized in that, The first protrusion (121) is semi-circular, square or trapezoidal, and / or the second protrusion (122) is semi-circular, square or trapezoidal.

4. The adapter pipe according to claim 1, characterized in that, The height of the first protrusion (121) protruding relative to the inner wall of the adapter tube is H3, the height of the flat tube (20) is H1, the adapter tube has a first inner wall (13) and a second inner wall (14) disposed opposite to each other, the first protrusion (121) is disposed on the first inner wall (13) and / or the second inner wall (14), the distance between the first inner wall (13) and the second inner wall (14) is H2, 0.2mm≤[H3-(H2-H1)]≤3mm.

5. The adapter pipe according to claim 1, characterized in that, The distance between the first protrusion (121) and the end face of the first pipe opening (11) is L1, 2mm≤L1≤10mm.

6. The transfer pipe according to claim 1, characterized in that, The height of the flat tube (20) is H1, and the connecting tube has a first inner wall (13) and a second inner wall (14) arranged opposite to each other. The distance between the first inner wall (13) and the second inner wall (14) is H2, and 0.02mm≤(H2-H1)≤0.4mm.

7. The adapter pipe according to claim 1, characterized in that, The adapter pipe has a second port (15), which is located at the end of the adapter pipe away from the first port (11), and the second port (15) is circular; or, the adapter pipe is a bent pipe, and both ends of the adapter pipe have the first port (11).

8. A microchannel heat exchanger, characterized in that, Includes a flat tube (20), a distributor (30), and a connector as described in any one of claims 1-7, wherein there are multiple connectors, the distributor (30) is provided with multiple capillary tubes (31), one end of some connectors is connected to the capillary tube (31) and the other end is connected to the flat tube (20), and both ends of some connectors are connected to the flat tube (20).

9. The microchannel heat exchanger according to claim 8, characterized in that, The microchannel heat exchanger also includes multiple fins (40), which are arranged in parallel. Each fin (40) has a slot (41) on it. Multiple flat tubes (20) are arranged in parallel to form multiple layers. The flat tubes (20) are inserted into the slots (41). The fins (40) are arranged in multiple rows. Each row of fins (40) includes multiple rows of slots (41) arranged at intervals. Along the height direction of the microchannel heat exchanger, the slots (41) on the same row of fins (40) are staggered.

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