CN116379807B

CN116379807B - Heat exchange assembly, micro-channel heat exchanger and air conditioner

Info

Publication number: CN116379807B
Application number: CN202310649951.0A
Authority: CN
Inventors: 岳宝; 徐照凯; 孙西辉; 李宁
Original assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Priority date: 2023-06-02
Filing date: 2023-06-02
Publication date: 2024-01-02
Anticipated expiration: 2043-06-02
Also published as: CN116379807A

Abstract

The application relates to the technical field of heat exchange related equipment and discloses a heat exchange assembly, a microchannel heat exchanger and an air conditioner, wherein the heat exchange assembly comprises a flat tube, a first fin and a second fin, the first fin is provided with a first end face, a first open slot is formed in the first end face, and the first fin is sleeved on one side of the flat tube through the first open slot; the second fin is provided with a second end face, a second open slot is formed in the second end face, and the second fin is sleeved on the other side of the flat tube through the second open slot; the first end face and the second end face are arranged oppositely, and the first end face and the second end face are arranged in a concave-convex fit mode. The first fin and the second fin can be positioned through concave-convex matching of the first end face and the second end face, so that the assembly efficiency of the flat tube and the fin assembly is improved, and the drainage of the first fin and the second fin can be realized on two sides of the flat tube, so that timely drainage of condensed water is facilitated.

Description

Heat exchange assembly, micro-channel heat exchanger and air conditioner

Technical Field

The application relates to the technical field of heat exchange related equipment, in particular to a heat exchange assembly, a micro-channel heat exchanger and an air conditioner.

Background

This section provides only background information related to the present application and is not necessarily prior art.

The microchannel heat exchanger generally adopts flat tubes to match with fins to realize heat exchange between the refrigerant and the outside air, and is more compact and more efficient compared with the conventional round tube fin heat exchanger. The convenience and stability of the assembly between the flat tube and the fins have great influence on the preparation efficiency of the microchannel heat exchanger. The drainage performance of the micro-channel heat exchanger has great influence on the heat exchange efficiency of the heat exchanger, particularly under the evaporation working condition, condensed water is easy to appear on the heat exchanger, and the condensed water stays on the flat tubes and the fins, so that the wind resistance of the heat exchanger can be increased, and the heat exchange performance of the heat exchanger is reduced. How to consider the drainage performance of the heat exchanger and the assembly convenience of the heat exchanger has important significance for improving the performance of the heat exchanger and improving the preparation efficiency.

Disclosure of Invention

The purpose of this application is to make microchannel heat exchanger can compromise better drainage performance and equipment convenience. The aim is achieved by the following technical scheme:

a first aspect of the present application proposes a heat exchange assembly comprising:

a flat tube;

the first fin is provided with a first end face, a first open slot is formed in the first fin, the opening of the first open slot faces the first end face, and the first fin is sleeved on one side of the flat tube through the first open slot;

The second fin is provided with a second end face, a second open groove is formed in the second fin, the opening of the second open groove faces the second end face, and the second fin is sleeved on the other side of the flat tube through the second open groove;

the first end face and the second end face are arranged opposite to each other, and the first end face and the second end face are arranged in a concave-convex fit mode.

According to the heat exchange assembly, the first fins and the second fins are used as fin assemblies of the flat tubes together, so that the assembly convenience and the drainage performance of the fin assemblies and the flat tubes can be considered. Wherein, first fin accessible first open slot is assembled to the flat pipe from one side of flat pipe, and the second fin accessible second open slot is assembled to the flat pipe from the opposite side of flat pipe, and the flat pipe is comparatively convenient with the equipment of fin subassembly, and first fin and second fin accessible first terminal surface and the unsmooth cooperation of second terminal surface are fixed a position, have improved the packaging efficiency of flat pipe and fin subassembly, and then have improved microchannel heat exchanger's equipment convenience and packaging efficiency. The first fins are connected with the flat tube through the first open grooves and the second fins through the second open grooves, so that water can be discharged from the two sides of the flat tube through the first fins and the second fins, condensed water on the flat tube, the first fins and the second fins can be discharged in time, and the water discharge performance of the heat exchange assembly is improved.

In addition, the heat exchange assembly according to the application can also have the following additional technical characteristics:

in some embodiments of the present application, the flat tube extends along a preset direction, the first fin and the second fin are arranged along a first direction, and the first end face and the second end face extend along a second direction;

the preset direction is perpendicular to the flow section of the flat pipe, and the first direction, the second direction and the preset direction are intersected in pairs.

In some embodiments of the present application, the number of the flat tubes is a plurality, and the plurality of flat tubes are spaced from each other along the second direction;

the first fins are provided with a plurality of first open slots along the second direction at intervals, the second fins are provided with a plurality of second open slots along the second direction at intervals, and the first open slots, the second open slots and the flat tubes are arranged in one-to-one correspondence.

In some embodiments of the present application, the first end face is provided with a protruding portion between two adjacent first open slots, the second end face is provided with a recessed portion between two adjacent second open slots, and the protruding portion cooperates with the recessed portion to enable the first end face to be in concave-convex cooperation with the second end face.

In some embodiments of the present application, the protrusion gradually approaches on both sides of the second direction along the direction of the first end face toward the second end face, so that the protrusion tapers.

In some embodiments of the present application, the protruding portion is provided in an arc shape protruding toward the recessed portion, and the recessed portion is provided in an arc shape protruding toward the recessed portion;

or, the protruding part is respectively arranged on two sides of the second direction in an inclined plane, and the recessed part is respectively arranged on two sides of the second direction in an inclined plane.

In some embodiments of the present application, the number of the first fins is a plurality, the plurality of the first fins are arranged at intervals along a preset direction, the number of the second fins is a plurality, the plurality of the second fins are arranged at intervals along the preset direction, and the first fins and the second fins are arranged in one-to-one correspondence;

the preset direction is perpendicular to the flow section of the flat tube.

In some embodiments of the present application, the heat exchange area of the first fin is smaller than the heat exchange area of the second fin;

and/or the first fin is different from the second fin in sheet type.

In some embodiments of the present application, the first fin is a flat fin, a corrugated fin, a bridged fin, or a louvered fin;

the second fin is a flat fin, a corrugated fin, a bridge fin or a shutter fin.

In some embodiments of the present application, the flat tube includes a first tube portion and a second tube portion, where the first tube portion and the second tube portion extend along a preset direction, and the first tube portion and the second tube portion are sequentially connected along a first direction, the first fin is sleeved on the first tube portion through the first open slot, and the second fin is sleeved on the second tube portion through the second open slot;

the preset direction is perpendicular to the flow section of the flat pipe, and the first direction is intersected with the preset direction.

In some embodiments of the present application, the first pipe portion and the second pipe portion are each provided with a medium flow channel;

the flow area of the medium flow passage of the first pipe portion is larger than the flow area of the medium flow passage of the second pipe portion, and/or the number of the medium flow passages of the first pipe portion is smaller than the number of the medium flow passages of the second pipe portion, and/or the shape of the flow cross section of the medium flow passage of the first pipe portion is different from the shape of the flow cross section of the medium flow passage of the second pipe portion.

In some embodiments of the present application, the first tube portion gradually decreases in thickness from a side closer to the second tube portion to a side farther from the second tube portion;

and/or the thickness of the second pipe part gradually decreases from one side close to the first pipe part to one side far away from the first pipe part.

In some embodiments of the present application, the first pipe portion includes a first wall surface and a second wall surface, the first wall surface and the second wall surface are disposed opposite to each other in a second direction, the first wall surface and the second wall surface are disposed gradually closer to each other from a side closer to the second pipe portion to a side farther from the second pipe portion, along the first direction, the first wall surface is an arc-shaped surface or an inclined surface and/or the second wall surface is an arc-shaped surface or an inclined surface, and the second direction intersects the first direction and the preset direction, respectively;

and/or the second pipe part comprises a third wall surface and a fourth wall surface, the third wall surface and the fourth wall surface are oppositely arranged in the second direction, the third wall surface and the fourth wall surface are gradually arranged close to each other from one side close to the first pipe part to one side far away from the first pipe part, and the third wall surface is an arc-shaped surface or an inclined surface and/or the fourth wall surface is an arc-shaped surface or an inclined surface along the first direction.

In some embodiments of the present application, a first rib plate is disposed in the first tube portion, two sides of the first rib plate respectively form a medium flow channel, the first rib plate is disposed in a bending manner along the second direction, and the first tube portion is connected with the first fin in an expanded connection manner;

the second pipe part is internally provided with a second rib plate, two sides of the second rib plate respectively form a medium flow passage, the second rib plate is arranged in a straight line along the second direction, and the second pipe part is welded or bonded with the first fin.

In some embodiments of the present application, a connection is provided between the first tube portion and the second tube portion;

the connecting part is provided with a drain hole and/or a bulge.

In some embodiments of the present application, the surface of the flat tube, the surface of the first fin, and/or the surface of the second fin is provided with a hydrophilic layer.

A second aspect of the present application proposes a microchannel heat exchanger comprising:

a current collecting assembly;

the heat exchange assembly provided by the first aspect and any embodiment of the first aspect of the present application, wherein the flat tube is connected with the current collecting assembly.

A third aspect of the present application provides an air conditioner comprising the microchannel heat exchanger of the second aspect of the present application.

The micro-channel heat exchanger and the air conditioner provided by the application have the same beneficial effects as the heat exchange assembly provided by the application.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 schematically illustrates a split schematic view of a heat exchange assembly according to some embodiments of the present application;

FIG. 2 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 3 schematically illustrates a split schematic view of a heat exchange assembly according to some embodiments of the present application;

FIG. 4 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 5 schematically illustrates a split schematic view of a heat exchange assembly according to some embodiments of the present application;

FIG. 6 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 7 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 8 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 9 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 10 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 11 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 12 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 13 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 14 schematically illustrates a schematic structural view of a flattened tube according to some embodiments of the present application;

FIG. 15 schematically illustrates a schematic structural view of a flattened tube according to some embodiments of the present application;

FIG. 16 schematically illustrates a schematic view of a heat exchange assembly according to some embodiments of the present application;

FIG. 17 schematically illustrates a schematic structural view of a flattened tube according to some embodiments of the present application;

FIG. 18 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 19 schematically illustrates a schematic structural view of a flattened tube according to some embodiments of the present application;

FIG. 20 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 21 schematically illustrates a schematic structural view of a flattened tube according to some embodiments of the present application;

FIG. 22 schematically illustrates a schematic structural view of a flattened tube according to some embodiments of the present application;

FIG. 23 schematically illustrates a schematic structural view of a flattened tube according to some embodiments of the present application;

FIG. 24 schematically illustrates a schematic structural view of a flattened tube according to some embodiments of the present application;

FIG. 25 schematically illustrates a schematic structural view of a heat exchange assembly according to some embodiments of the present application;

FIG. 26 schematically illustrates a schematic view of one view of a heat exchange assembly according to some embodiments of the present application;

FIG. 27 schematically illustrates a partial schematic view of FIG. 26;

FIG. 28 schematically illustrates a schematic view of one view of a heat exchange assembly according to some embodiments of the present application;

FIG. 29 schematically illustrates a partial schematic view of FIG. 28;

FIG. 30 schematically illustrates a schematic view of one view of a heat exchange assembly according to some embodiments of the present application;

FIG. 31 schematically illustrates a split schematic view of a heat exchange assembly according to some embodiments of the present application;

FIG. 32 schematically illustrates a schematic flow direction diagram of a cross section of a flat sheet fin;

FIG. 33 schematically illustrates a schematic flow direction diagram of a cross section of a corrugated sheet fin;

FIG. 34 schematically illustrates a schematic flow direction diagram of a cross section of a bridge fin;

FIG. 35 schematically illustrates a schematic flow direction diagram of a cross section of a louvered fin;

FIG. 36 schematically illustrates a schematic view of a microchannel heat exchanger according to some embodiments of the present application;

FIG. 37 schematically illustrates a schematic view of one view of FIG. 36;

FIG. 38 schematically illustrates a schematic view of another view of FIG. 36;

FIG. 39 schematically illustrates a schematic view of an adapter component according to some embodiments of the present application;

FIG. 40 schematically illustrates a schematic view of another view of the adapter component illustrated in FIG. 39;

FIG. 41 schematically illustrates a schematic sectional isometric view of the adapter component illustrated in FIG. 39;

FIG. 42 schematically illustrates a cross-sectional view of the adapter member of FIG. 39 from one perspective;

FIG. 43 schematically illustrates a cross-sectional view of a mixing portion of the adapter component illustrated in FIG. 39 from one perspective;

FIG. 44 schematically illustrates a schematic view of a flattened tube according to some embodiments of the present application;

FIG. 45 schematically illustrates a schematic view of an adapter component connected to a flat tube according to some embodiments of the present application;

FIG. 46 schematically illustrates a schematic view of a microchannel heat exchanger according to some embodiments of the present application;

FIG. 47 schematically illustrates a schematic view of a microchannel heat exchanger according to further embodiments of the present application;

FIG. 48 schematically illustrates a plot of the size of the mixing section within the flat tube versus the split bias of the flat tube;

FIG. 49 is a graph schematically showing preset media flow in a flat tube and size of a mixing section versus split deviation of the flat tube;

Fig. 50 schematically shows the dimensions of the necked-down section in the direction from the circular interface to the flat interface, the diameter of the necked-down section, and the ratio of the diameter of the circular interface to the pressure drop of the medium.

The reference numerals are as follows:

100. a component body; 101. a flat connecting part; 1011. a fifth sidewall; 1013. a seventh sidewall; 1014. an eighth sidewall; 102. a mixing section; 1021. a first sidewall; 1022. a second sidewall; 1023. a third sidewall; 1024. a fourth sidewall; 103. a pinch portion; 104. a circular connecting part; 105. a first transition portion; 106. a second transition portion; 107. a third transition portion; 111. a flat interface; 112. a mixing section; 113. a necking section; 114. a circular interface; 115. a first transition section; 116. a second transition section; 117. a third transition section;

21. a first pipe section; 211. a first wall surface; 212. a second wall surface; 213. a first rib plate; 214. a first reinforcing part; 22. a second pipe section; 221. a third wall surface; 222. a fourth wall surface; 223. a second rib plate; 224. a second reinforcing part; 23. a connection part; 231. a drain hole; 232. a protrusion; 200. a flat tube; 201. a media flow path; 202. rib plates; 210. a first side; 220. a second side;

300. A current collecting assembly; 310. collecting pipes; 320. a shunt; 330. a shunt; 340. a connecting pipe;

400. a fin assembly; 401. flat fin; 402. corrugated fins; 403. bridge fin type; 404. a louver fin; 410. a first fin; 411. a first flow guiding part; 412. a first mounting portion; 413. a first open slot; 414. a first end face; 415. a protruding portion; 420. a second fin; 421. a second flow guiding part; 422. a second mounting portion; 423. a second open slot; 424. a second end face; 425. a recessed portion; 431. a first portion; 432. a second portion;

x, a first direction; y, second direction; z, presetting a direction; B. the direction of airflow; a1, a first width; a2, a second width; a3, a first interval; a4, a second interval; α1, a first included angle; α2, a second included angle.

Detailed Description

Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

As shown in fig. 1 to 50, the present embodiment proposes a heat exchange assembly including a heat exchange tube and a fin assembly 400, the fin assembly 400 being connected to the heat exchange tube. The heat exchange assembly can be applied to a heat exchanger, and particularly can be a microchannel heat exchanger. The heat exchange tube is internally provided with a medium flow passage for medium flow, and when the heat exchange tube is applied to a heat exchanger in an air conditioner, the medium is a refrigerant. The heat exchange tube may be a flat tube 200 or a round tube, and the flat tube 200 may be understood as a tube with a cross section (i.e. a flow cross section) having different dimensions in two directions perpendicular to each other, and specifically, the flat tube 200 may be a flat tube with an oval cross section, or a strip-shaped flat tube 200 with an arc-shaped edge, etc. The fin assembly 400 is connected with the heat exchange tube, and heat transfer can be performed between the fin assembly 400 and the heat exchange tube, so that the heat exchange tube can exchange heat with the outside air and the like through the fin assembly 400, and the heat exchange efficiency of the heat exchange assembly is improved.

In the following description, a heat exchange assembly is mainly used as an example of a microchannel heat exchanger, and a heat exchange tube of the heat exchange assembly of the microchannel heat exchanger is generally a flat tube 200.

In some cases, the fins of the fin assembly 400 are integrally constructed, that is, the fin assembly 400 includes an integral fin sleeved on the flat tube 200, a mounting hole is punched in the middle of the fin assembly 400 (when the flat tube 200 is the flat tube 200, the mounting hole is a flat long hole), the flat tube 200 is inserted into the mounting hole from one axial end of the mounting hole, and then the fin assembly 400 is welded with the flat tube 200. The microchannel heat exchanger can adopt a high-temperature brazing technology, parts such as the fin assembly 400, the flat tube 200, the collecting pipe 310 and the like are assembled into a whole, and are welded and formed in a furnace, and the welding requires a smaller gap between the fin assembly 400 and the flat tube 200, and generally requires the gap to be smaller than 0.1mm, and the single side is required to be smaller than 0.05 mm. However, when the integral fin with the middle punched mounting hole is adopted, the fin assembly 400 and the flat tube 200 are required to be assembled through the tube, and in order to facilitate the tube threading, the gap between the fin assembly 400 and the flat tube 200 is required to be enlarged to 0.2 mm or more, but the increase of the gap can lead to the reduction of the welding combination rate of the micro-channel heat exchanger, so that the requirement of brazing welding gap (generally less than 0.1mm and unilateral less than 0.05 mm) is met, the flat tube 200 is difficult to carry out the tube threading of the mounting hole, the process difficulty is high, and the mass production is difficult to realize.

For the problem that the tube threading operation and welding requirements of the flat tube 200 and the fin assembly 400 are difficult to balance, in one implementation, as shown in fig. 1 to 13 and fig. 16, 18, 20, 25 and 31, the fin assembly 400 may include a first fin 410 and a second fin 420, and the first fin 410 and the second fin 420 are disposed separately on both sides of the flat tube 200. The first fin 410 is provided with a first open slot 413, the second fin 420 is provided with a second open slot 423, and the openings of the first open slot 413 and the second open slot 423 are both arranged facing the flat tube 200, so that the flat tube 200 can be inserted into the first open slot 413 and the second open slot 423 respectively through the openings of the first open slot 413 and the second open slot 423.

The first fin 410 and the second fin 420 may be separately arranged and assembled to the flat tube 200 by buckling from two sides of the flat tube 200, so that the assembling operation between the first fin 410 and the flat tube 200 and the assembling operation between the second fin 420 and the flat tube 200 are convenient. The dimensions of the first open slot 413 and the second open slot 423 can be close to the corresponding dimensions of the corresponding flat tube 200 to meet the welding requirement of the fin assembly 400 and the flat tube 200, and the convenience of assembly between the first fin 410 and the flat tube 200 and between the second fin 420 and the flat tube 200 is not affected when the dimensions of the open slot are close to the dimensions of the flat tube 200. Therefore, the first fins 410 and the second fins 420 on two sides of the flat tube 200 of the heat exchange assembly of the embodiment can be fastened to the flat tube 200, so that the welding process requirement can be met, the difficulty caused by long-distance tube penetrating is eliminated, and the manufacturing manufacturability is good.

In one embodiment, the first fin 410 has a first end surface 414, the first fin 410 is provided with a first open slot 413, the first open slot 413 faces the first end surface 414, and the first fin 410 is sleeved on one side of the flat tube 200 through the first open slot 413. The second fin 420 has a second end surface 424, a second open groove 423 is provided on the second fin 420, the opening of the second open groove 423 faces the second end surface 424, and the second fin 420 is sleeved on the other side of the flat tube 200 through the second open groove 423. The first end face 414 is disposed opposite to the second end face 424, and the first end face 414 is disposed in concave-convex engagement with the second end face 424.

As shown in fig. 1, 3 and 5, the opening of the first open slot 413 is disposed towards the first end face 414, that is, the opening of the first open slot 413 is disposed on the first end face 414; the opening of the second open groove 423 is disposed toward the second end surface 424, that is, the opening of the second open groove 423 is opened on the second end surface 424.

The first end surface 414 and the second end surface 424 are in concave-convex fit, which means that the first end surface 414 and the second end surface 424 are respectively concave-convex surfaces, and the concave part of one is arranged corresponding to the convex part of the other, so that the first end surface 414 and the second end surface 424 are in concave-convex fit.

The first fin 410 and the second fin 420 are each sheet-like structures, and the first end face 414 and the second end face 424 are sides of edges of the sheet-like structures. According to the heat exchange assembly of the present embodiment, the first fins 410 and the second fins 420 are used together as the fin assembly 400 of the flat tube 200, so that the convenience in assembling the fin assembly 400 and the flat tube 200 can be considered, and the drainage performance can be improved. Wherein, first fin 410 accessible first open slot 413 is assembled to flat tube 200 from one side of flat tube 200, and second fin 420 accessible second open slot 423 is assembled to flat tube 200 from the opposite side of flat tube 200, and flat tube 200 is comparatively convenient with the equipment of fin subassembly 400, and first fin 410 and second fin 420 accessible first terminal surface 414 and the unsmooth cooperation of second terminal surface 424 are fixed a position, have improved the equipment efficiency of flat tube 200 and fin subassembly 400, and then have improved the equipment convenience and the equipment efficiency of microchannel heat exchanger. The first fins 410 are connected with the flat tube 200 through the first open grooves 413 and the second fins 420 are connected with the flat tube 200 through the second open grooves 423, so that water can be drained from two sides of the flat tube 200 through the first fins 410 and the second fins 420, timely drainage of condensed water on the flat tube 200, the first fins 410 and the second fins 420 is facilitated, and the drainage performance of the heat exchange assembly is improved.

During assembly, the fin assembly 400 is usually pre-assembled to the flat tube 200, and then the fin assembly is stably connected to the flat tube 200 by welding, bonding or expansion. When the first fin 410 and the second fin 420 are preassembled to the flat tube 200, the first fin 410 and the second fin 420 are in concave-convex fit with the second end face 424 through the first end face 414, so that the first fin 410 and the second fin 420 can be mutually held to have good stability, the risk that the first fin 410 and the second fin 420 are separated from the flat tube in the subsequent welding, bonding or expansion process after the preassembling process is completed is reduced, and the assembly success rate of the heat exchange component is improved.

As shown in fig. 1 to 13, 16, 18, 20, and 25, in one specific implementation, the flat tube 200 extends along a preset direction Z, the first fins 410 and the second fins 420 are aligned along a first direction X, and the first end face 414 and the second end face 424 extend along a second direction Y. The preset direction Z is perpendicular to the flow cross section of the flat tube 200, and the first direction X, the second direction Y and the preset direction Z intersect two by two.

The preset direction Z is a flow direction of a medium (i.e., a refrigerant) in the flat tube 200, which is perpendicular to a flow cross section of the flat tube 200, and the flow cross section refers to a cross section of the flat tube 200 along the direction perpendicular to the preset direction Z (i.e., the medium flow direction). The first direction X may be perpendicular to the preset direction Z, or may be inclined with respect to the preset direction Z. The second direction Y may be perpendicular to both the first direction X and the preset direction Z. In a specific embodiment, the preset direction Z may be understood as a length direction of the flat tube 200, the first direction X may be understood as a width direction of the flat tube 200, and the second direction Y may be understood as a thickness direction of the flat tube 200.

Alternatively, as shown in fig. 1-13, 16, 18, 20, and 25, in one embodiment, the fin assembly 400 may be connected to a plurality of flat tubes 200 simultaneously. Specifically, the number of the flat tubes 200 is plural, the plural flat tubes 200 are arranged at intervals along the second direction Y, the first fins 410 are provided with plural first open grooves 413 at intervals along the second direction Y, the second fins 420 are provided with plural second open grooves 423 along the second direction Y, and the plural first open grooves 413, the plural second open grooves 423 and the plural flat tubes 200 are arranged in one-to-one correspondence.

Wherein a plurality refers to two or more. The first open slots 413 and the second open slots 423 are respectively sleeved on two sides of the corresponding flat tubes, the first open slots 413 are positioned on the same side of the flat tubes 200, and the second open slots 423 are positioned on the same other side of the flat tubes 200.

It can be appreciated that the fin assembly 400 is connected with a plurality of flat tubes 200 at the same time, so that the assembly is convenient, and the plurality of flat tubes 200 are synchronously connected with the fin assembly 400, so that the temporary fixing stability of the flat tubes 200 and the fin assembly 400 in the preassembling process can be improved.

Alternatively, in one embodiment, as shown in fig. 1 to 6, the first end face 414 is provided with a protruding portion 415 between two adjacent first open grooves 413, the second end face 424 is provided with a recessed portion 425 between two adjacent second open grooves 423, and the protruding portion 415 cooperates with the recessed portion 425 to enable the first end face 414 to be in concave-convex cooperation with the second end face 424.

The protruding portion 415 and the recessed portion 425 are disposed at two sides of the open slot, that is, at two sides of the flat tube 200, so that the assembly of the flat tube 200 is not affected, and the convenience of the assembly of the flat tube 200 is improved.

Alternatively, in a further embodiment, as shown in fig. 1 to 6, the projections 415 gradually approach on both sides in the second direction Y in the direction of the first end face 414 toward the second end face 424, so that the projections 415 taper.

Specifically, as shown in fig. 1 and fig. 4, along the direction from the first end face 414 toward the second end face 424, the protruding portions 415 are disposed in inclined planes on both sides in the second direction Y, and the inclined planes on both sides are disposed gradually closer to each other, so that the protruding portions 415 taper; the concave portion 425 is disposed in an inclined plane on both sides of the second direction Y. Wherein the bulge 415 shown in fig. 1 and 2 is generally trapezoidal, and the recess 425 is trapezoidal in shape as the bulge 415; the projections 415 shown in fig. 3 and 4 are generally triangular, and the recesses 425 are triangular shaped identical to the projections 415.

As shown in fig. 5 and 6, the protruding portion 415 may also be provided in an arc shape protruding toward the recessed portion 425, and the recessed portion 425 is provided in an arc shape protruding toward the recess of the protruding portion 415.

It can be appreciated that by tapering the protruding portion 415, the protruding portion 415 is conveniently inserted into the corresponding recess 425, thereby improving the convenience of assembling the first fin 410 and the second fin 420 to the flat tube 200.

Alternatively, referring to fig. 26, 28 and 30, the number of the first fins 410 may be plural, and the plural first fins 410 may be spaced apart from each other in the preset direction Z.

Alternatively, the number of the second fins 420 may be plural, and the plurality of second fins 420 may be spaced apart from one another along the preset direction Z.

The first fin 410 and the second fin 420 of the heat exchange assembly according to this embodiment may have the same or different structure according to the usage scenario (such as high temperature, low temperature, high humidity, low humidity, sand wind dust, etc.), and the width and the sheet type of the two groups of fins may be combined according to the actual requirements.

Wherein in some embodiments the first fin 410 is the same structure as the second fin 420. The first fin 410 and the second fin 420 may be symmetrically disposed. Specifically, the first fins 410 and the second fins 420 that are symmetrically arranged have the same structure, including the same size and the same sheet shape, and when the number of the first fins 410 and the second fins 420 is plural, the arrangement modes of the plurality of first fins 410 and the plurality of second fins 420 are the same. By symmetrically designing the first fin 410 and the second fin 420, the first fin 410 and the second fin 420 can share a die, and cost investment of fin dies, equipment and the like is reduced.

Specifically, as shown in fig. 1 to 9, when the first end face 414 of the first fin 410 is in concave-convex engagement with the second end face 424 of the second fin 420, the structures of the first fin 410 and the second fin 420 may be the same, the first fin 410 may be rotated 180 degrees around a center line of the flat tube 200 extending in the preset direction Z to obtain the second fin 420, and the first fin 410 and the second fin 420 are substantially centrosymmetric.

Alternatively, in some embodiments, the heat exchange capacity of the first fin 410 may be less than the heat exchange capacity of the second fin 420.

Specifically, when the first fin 410 and the second fin 420 have different structures, different heat exchanging capacities may be provided between the first fin 410 and the second fin 420. The stronger the heat exchange capacity of the fins is, the easier frosting is generated on the heat exchanger when the heat exchanger is applied to an evaporation working condition. The comparison of the heat exchange capacities of the first fin 410 and the second fin 420 is a comparison under the same environmental condition, and the heat exchange assembly is applied to the outdoor unit of the air conditioner for example, the same environment comprises the same external environment temperature, the same gas flow rate passing through the first fin 410 and the second fin 420, the same temperature and the same flow rate of the refrigerant in the flat tube 200 corresponding to the first fin 410 and the second fin 420. Specifically, the heat exchange coefficient of the first fin 410 may be different from the heat exchange coefficient of the second fin 420, or the heat exchange area of the first fin 410 or the heat exchange area of the second fin 420 may be different, so that the mass transfer coefficient (the mass transfer coefficient is proportional to the heat transfer coefficient) of the first fin 410 is different from the mass transfer coefficient of the second fin 420, so that the heat exchange capacity of the first fin 410 is different from the heat exchange capacity of the second fin 420. One of the first fin 410 and the second fin 420 with weaker heat exchange capability may focus on dehumidification, and may reduce the likelihood of condensed water or frost formation of the heat exchanger when the heat exchanger is applied to an evaporation condition, for example, in some embodiments, the first fin 410 may be disposed on an upwind side, the second fin 420 may be disposed on a downwind side, and the heat exchange capability of the first fin 410 may be smaller than the heat exchange capability of the second fin 420 along the airflow direction B of the surface of the heat exchange assembly. Several examples of the difference in heat exchange capacity between the first fin 410 and the second fin 420 are given below.

In some embodiments, the heat exchange area of the first fin 410 is smaller than the heat exchange area of the second fin 420.

Specifically, in an alternative manner, as shown in fig. 25, along the first direction X, the first fin 410 has a first width A1, and the second fin 420 has a second width A2, one of the first width A1 and the second width A2 being larger than the other. When the lengths of the first fin 410 and the second fin 420 in the second direction Y are the same, the thicknesses, materials and the like of the first fin 410 and the second fin 420 are the same, and the included angles of the first portion 431 and the second portion 432 are the same, the larger the width of the fin, the larger the heat exchange area of the fin, the stronger the heat exchange capability, and the fin widths of the first fin 410 and the second fin 420 are set to be different, so that the first fin 410 and the second fin 420 have different heat exchange capability, and different combinations can be performed according to actual requirements, thereby achieving the performance requirements of the heat exchanger, such as enhanced heat exchange, rapid drainage, difficult blockage and the like.

It should be noted that the heat exchange area of the first fin 410 may be understood as an area of all surfaces of the first portion 431 and the second portion 432 of the first fin 410, and the heat exchange area of the second fin 420 may be understood as an area of all surfaces of the first portion 431 and the second portion 432 of the second fin 420.

In one particular implementation, the first fin 410 is located on the upwind side and the second fin 420 is located on the downwind side along the airflow direction B, and the first width A1 is smaller than the second width A2. The airflow direction B is the flow direction of the airflow flowing through the surface of the flat tube 200.

In some embodiments, as shown in fig. 30, the number of the first fins 410 is plural, the plurality of first fins 410 are disposed at intervals along the preset direction Z of the flat tube 200, the number of the second fins 420 is plural, the plurality of second fins 420 are disposed at intervals along the extending direction of the flat tube 200, the interval between two adjacent first fins 410 is a first interval A3, the interval between two adjacent second fins 420 is a second interval A4, and one of the first interval A3 and the second interval A4 is larger than the other. It will be appreciated that the length of the flat tube 200, i.e., the length of the flat tube 200 in the preset direction Z is the same, and when the first interval A3 is different from the second interval A4, the number of the first fins 410 and the number of the second fins 420 which can be arranged in the length direction of the flat tube 200 are also different. In the first interval A3 and the second interval A4, the heat exchange capacity of the fin corresponding to one of the larger intervals is smaller than that of the other one.

In one particular implementation, the first fins 410 are located on the upwind side and the second fins 420 are located on the downwind side along the airflow direction B, with the first pitch A3 being greater than the second pitch A4.

In some embodiments, as shown in fig. 10-13, the sheet form of the first fin 410 is different from the sheet form of the second fin 420. The first fin 410 may be a flat fin 401, a corrugated fin 402, a bridge fin 403, a louver fin 404, or the like, and the second fin 420 may be a flat fin 401, a corrugated fin 402, a bridge fin 403, a louver fin 404, or the like. The first fin 410 and the second fin 420 may be combined with any two of the above-described sheet-type fins such that the sheet-type of the first fin 410 is different from that of the second fin 420.

In one particular implementation, the first fin 410 is located on the upwind side and the second fin 420 is located on the downwind side along the airflow direction B, and the heat exchange capacity of the first fin 410 is smaller than the heat exchange capacity of the second fin 420. Specifically, in the case where the first fin 410 is a flat fin 401, the second fin 420 may be a corrugated fin 402, a bridged fin 403 or a louver fin 404; in the case where the first fin 410 is the corrugated fin 402, the second fin 420 may be the bridge fin 403 or the louver fin 404; in the case where the first fin 410 is a bridge fin 403, the second fin 420 may be a louver fin 404. For example, as shown in fig. 10, the first fin 410 is a flat plate fin 401, and the second fin 420 is a bridge plate fin 403; as shown in fig. 11, the first fin 410 is a flat plate type fin 401, and the second fin 420 is a louver type fin 404; as shown in fig. 12, the first fin 410 is a corrugated fin 402, and the second fin 420 is a bridge fin 403; as shown in fig. 13, the first fin 410 is a corrugated fin 402 and the second fin 420 is a louver fin 404.

Wherein both the flat fin 401 and the corrugated fin 402 are seamless fins. The flat plate type fin is also called a plain surface fin or a smooth fin, the flat plate type fin 401 is a flat plate type fin, and a member for changing the flow direction B of the air flow is not provided on the fin, and as shown in fig. 32, when the air flow passes through the flat plate type fin 401, the flow direction C1 of the air flow is substantially parallel to the extending direction of the flat plate type fin 401 and flows in a straight line. The corrugated fin 402 is provided with a continuous uneven structure along the airflow direction B, and as shown in fig. 33, when the airflow passes through the corrugated fin 402, the airflow direction C2 is influenced by the uneven structure of the corrugated fin 402 and flows along the uneven structure. Under the condition of the same fin width and length, the heat exchange area and the heat transfer coefficient of the corrugated fin 402 are larger than those of the flat fin 401, namely, the mass transfer coefficient and the heat transfer capacity of the corrugated fin 402 are larger than those of the flat fin 401, and accordingly, when the corrugated fin 402 is applied to an evaporation working condition, the corrugated fin 402 is easier to frost than the flat fin 401.

The bridge fin 403 and the louver fin 404 are slit fins. As shown in fig. 34, the fin body is slotted, and a bridge is disposed at a position corresponding to the slot, and a gap is provided between the bridge and the slot of the fin body, so that an air flow can pass between the bridge and the fin body, specifically, a flow direction C3 of the air flow flowing through the fin 403 is shown in fig. 34, two ends of the bridge are connected to the fin body, and the bridge and the fin body may be of an integral structure. Under the condition of the same fin width and length, the heat exchange area and heat transfer coefficient of the bridge fin 403 are generally larger than those of the flat fin 401 and the corrugated fin 402, that is, the mass transfer coefficient and heat transfer capacity of the bridge fin 403 are larger than those of the flat fin 401 and those of the corrugated fin 402, and accordingly, when the bridge fin 403 is applied to evaporation conditions, frost is more likely to be formed than the flat fin 401 and the corrugated fin 402. As shown in fig. 35, the shutter-type fin 404 is provided with a plurality of guide vanes in the airflow direction B, the plurality of guide vanes are arranged in a shutter-type manner, airflow channels are formed between adjacent guide vanes, and the guide directions of the guide vanes at both ends of the airflow direction C4 are different. In the case of the same fin width and length, the heat exchange area and heat transfer coefficient of the shutter fins 404 will be generally larger than those of the bridge fins 403, that is, the mass transfer coefficient and heat transfer capacity of the shutter fins 404 are larger than those of the bridge fins 403, and accordingly, when applied to the evaporation conditions, the shutter fins 404 are more prone to frosting than the bridge fins 403 and the corrugated fins 402.

In some embodiments, the fin width, fin spacing, and fin type may be stacked to vary the heat exchange capacity of the first fin 410 and the second fin 420. In a particular embodiment, the first width A1 of the first fins 410 is less than the second width A2 of the second fins 420, the first spacing A3 of the plurality of first fins 410 is greater than the second spacing A4 of the plurality of second fins 420, and the sheet-like mass transfer coefficient of the first fins 410 is less than the mass transfer coefficient of the second fins 420 such that the total heat exchange capacity of all the first fins 410 on the first side of the flat tube 200 is less than the total heat exchange capacity of all the second fins 420 on the second side of the flat tube 200. The side of the flat tube 200 corresponding to the first fin 410 is a first side, and the side of the flat tube 200 corresponding to the second fin 420 is a second side. The flat tube 200 extends along a preset direction Z, and correspondingly, the first side and the second side extend along the preset direction Z of the flat tube 200 respectively.

When the heat exchanger including the heat exchange assembly of the present embodiment is applied to the evaporation condition, the airflow flowing direction B flows along the first direction X, and one of the first fins 410 and the second fins 420 with weak heat exchange capability may be located on the upwind side (i.e. the windward side), and the other one may be located on the downwind side (i.e. the leeward side). As shown in fig. 10 to 13, 25, and 30, the first fin 410 is provided on the windward side and the second fin 420 is provided on the leeward side, taking the case where the heat exchange capacity of the first fin 410 is weaker than that of the second fin 420. Wherein the windward side is located upstream of the leeward side in the airflow direction B. The first fin 410 with weaker heat exchange capability is located on the windward side, and the second fin 420 with stronger heat exchange capability is located on the leeward side, so that the heating can be enhanced under the low temperature condition. Specifically, in the range of the first fin 410, the air exchanges heat with the medium in the flat tube 200, because the heat exchange capability is low, condensed water is not easy to appear, the moisture is removed, and when the air flow passing through the first fin 410 flows to the second fin 420, the temperature is reduced, when the air flow exchanges heat in the range of the second fin 420, the temperature difference between the air flow and the second fin 420 and the flat tube 200 is reduced, condensed water is not easy to appear, by the mode that the upper wind side focuses on dehumidification and the lower wind side focuses on heat exchange, the amount of the condensed water and frost is reduced, the influence of the condensed water and frost on the heat exchange performance of the heat exchanger is reduced, so that the heat exchange capability can be enhanced, the heat absorption effect under the evaporation working condition is better, and when the micro-channel heat exchanger is used as an outdoor unit of the air conditioner, the indoor heating effect of the air conditioner can be enhanced.

In some embodiments, the flat tube 200 includes a first tube portion 21 and a second tube portion 22, where the first tube portion 21 and the second tube portion 22 are sequentially disposed and connected along the first direction X, a first side is formed on a side of the first tube portion 21 away from the second tube portion 22, the first tube portion 21 is inserted into the first open slot 413, a second side is formed on a side of the second tube portion 22 away from the first tube portion 21, and the second tube portion 22 is inserted into the second open slot 423.

The first open slot 413 is adapted to the first tube portion 21, such that the first tube portion 21 may be inserted into the first open slot 413, and the first tube portion 21 may be connected to the first fin 410 by bonding, welding or expansion to be stably disposed in the first open slot 413. The second open groove 423 is adapted to the second tube portion 22 such that the second tube portion 22 may be inserted into the second open groove 423, and the second tube portion 22 may be connected to the second fin 420 by bonding, welding or expansion to be stably disposed in the second open groove 423. As shown in fig. 1, 3, 5 and 31, each of the first and second open grooves 413 and 423 may be a U-shaped groove adapted to both sides of the flat tube 200.

Alternatively, as shown in fig. 1 to 6, the first fin 410 may be provided with the first reinforcing portion 214 corresponding to the first open groove 413. The second fin 420 may be provided with a second reinforcing portion 224 corresponding to the second open groove 423, the first reinforcing portion 214 is disposed flush with an inner wall of the first open groove 413, and the second reinforcing portion 224 is disposed flush with an inner wall of the second open groove 423. The first reinforcing portion 214 is circumferentially surrounded by the first open groove 413, the first tube portion 21 is inserted into the open groove formed by the first open groove 413 and the first reinforcing portion 214, and the outer peripheral surface of the first tube portion 21 is connected to the first reinforcing portion 214. The second reinforcing portion 224 is circumferentially surrounded by the second open groove 423, the second reinforcing portion 224 is circumferentially surrounded by the same open groove as the second open groove 423, the second pipe portion 22 is inserted into the open groove formed by the second open groove 423 and the second reinforcing portion 224, and the outer peripheral surface of the second pipe portion 22 is connected to the second reinforcing portion 224.

The first reinforcing portion 214 may be integrally configured with the first fin 410, and the first reinforcing portion 214 may be a burring structure of the first fin 410 corresponding to the first open groove 413. The second reinforcing portion 224 may be integrally configured with the second fin 420, and the second reinforcing portion 224 may be a burring structure of the first fin 410 corresponding to the second open groove 423.

In this embodiment, by providing the first reinforcing portion 214 and the second reinforcing portion 224, the connection stability and the contact area between the first fin 410 and the first tube portion 21, and the connection stability and the contact area between the second fin 420 and the second tube portion 22 can be improved, so that the heat exchange efficiency of the heat exchange assembly can be improved.

Depending on the usage scenario of the matched first fin 410 and second fin 420, the flat tube 200 may have a symmetrical structure or an asymmetrical structure. Referring to fig. 1 to 6, the first tube part 21 and the second tube part 22 may be symmetrically disposed with respect to a center line of the flat tube 200 extending in the predetermined direction Z as a symmetry axis.

In the case of the flat tube 200 having an asymmetric structure, the thicknesses of the first tube portion 21 and the second tube portion 22, the number of the medium flow passages 201, the shape of the medium flow passages 201, and the like may be combined according to actual requirements. In the case where the first pipe portion 21 and the second pipe portion 22 are asymmetrically arranged, the heat exchange capacity of the first pipe portion 21 and the second pipe portion 22 can be made different, and the heat exchange or rapid drainage effect can be enhanced. The asymmetric arrangement of the flat tube 200 may be combined with the asymmetric arrangement of the first fin 410 and the second fin 420 to further enhance heat exchange or rapid drainage effect. In one implementation, the heat exchange capacity of the first tube portion 21 may be set smaller than the heat exchange capacity of the second tube portion 22. Several embodiments of asymmetric placement of flattened tube 200 are described below.

In one embodiment, the first tube part 21 and the second tube part 22 are different in size in the first direction X or the second direction Y, which intersects the first direction X and the preset direction Z, respectively.

In one embodiment, the first tube portion 21 is located on the upwind side and the second tube portion 22 is located on the downwind side along the airflow direction B, and the size of the second tube portion 22 in the second direction Y is smaller than the size of the first tube portion 21 in the second direction Y.

Specifically, as shown in fig. 25, the dimensions of the first tube portion 21 and the second tube portion 22 in the first direction X may be different; as shown in fig. 31, the first pipe portion 21 and the second pipe portion 22 may be different in size in the first direction X, and may be also different in size in the second direction Y. Under the same conditions, the larger the dimensions of the first tube portion 21 and the second tube portion 22 in the first direction X or the second direction Y, the larger the heat exchange capacity, and the present embodiment may enable the region corresponding to the first tube portion 21 and the region corresponding to the second tube portion 22 to have different heat exchange capacities.

In one embodiment, the first tube portion 21 is shaped differently than the second tube portion 22.

The difference in shape between the second tube portion 22 and the first tube portion 21 is understood to mean that the second tube portion 22 cannot be obtained when the first tube portion 21 is enlarged or reduced with the geometric center as the origin. The second tube portion 22 may have a different shape from the first tube portion 21, and the first tube portion 21 and the second tube portion 22 may have different heat exchanging capacities. The first pipe portion 21 and the second pipe portion 22 may have different shapes, and the first pipe portion 21 and the second pipe portion 22 may have different outer contours. The first pipe portion 21 and the second pipe portion 22 may be different in shape, or the shape or the number of medium flow passages in the first pipe portion 21 and the second pipe portion 22 may be different.

In one embodiment, the first pipe portion 21 and the second pipe portion 22 are provided with a medium flow channel 201; one of the flow area of the medium flow passage 201 of the first pipe portion 21 and the flow area of the medium flow passage 201 of the second pipe portion 22 is larger than the other.

The medium flow path 201 is understood to be the flow area of the individual medium flow path 201. The flow area of the medium flow channel 201 is the area of the flow cross section of the medium flow channel 201, which refers to the cross section of the member perpendicular to the preset direction Z. The larger the flow area of the medium flow passage 201, the weaker the heat exchange capacity. The comparison of the heat exchange capacities of the first pipe portion 21 and the second pipe portion 22 is a comparison under the same environmental condition, and the heat exchange assembly is applied to the outdoor unit of the air conditioner, for example, the same environment includes the same external environment temperature, the same gas flow rate passing through the first pipe portion 21 and the second pipe portion 22, the same temperature and the same flow rate of the refrigerant in the flat pipe 200 corresponding to the first pipe portion 21 and the second pipe portion 22.

In one specific implementation, along the airflow direction B, the first pipe portion 21 is located on the upwind side, the second pipe portion 22 is located on the downwind side, and the flow area of the medium flow channel 201 of the first pipe portion 21 is larger than the flow area of the medium flow channel of the second pipe portion 22.

In another embodiment, one of the number of the medium flow passages 201 of the first pipe portion 21 and the number of the medium flow passages 201 of the second pipe portion 22 is greater than the other. The greater the number of medium flow channels 201, the greater the heat exchange capacity, under otherwise identical conditions.

In one specific implementation, as shown in fig. 22 and 24, the first pipe portion 21 is located on the upwind side and the second pipe portion 22 is located on the downwind side in the airflow direction B, and the number of medium flow passages 201 of the first pipe portion 21 is smaller than the number of medium flow passages of the second pipe portion 22.

In still another specific embodiment, as shown in fig. 22 and 23, the shape of the flow cross section of the medium flow passage 201 of the first pipe portion 21 is different from the shape of the flow cross section of the medium flow passage 201 of the second pipe portion 22.

In some embodiments, the outer contours of the first pipe portion 21 and the second pipe portion 22 and the flow cross-sectional shape, flow area, number, etc. to which the medium flows may be superimposed so that the heat exchanging capacity of the first pipe portion 21 and the second pipe portion 22 is different. For example, as shown in fig. 22 and 24, the first pipe portion 21 and the second pipe portion 22 are different in size along the first direction X, the number of medium flow passages 201 is different, and the shape and flow area of the medium flow passages are also different.

When the heat exchanger including the heat exchange assembly of the present embodiment is applied to the evaporation condition, the airflow flowing direction B flows along the first direction X, and one of the first tube portion 21 and the second tube portion 22 with weak heat exchange capability may be located on the windward side, and the other one with strong heat exchange capability may be located on the leeward side. Taking the case where the heat exchanging capacity of the first tube portion 21 is weaker than that of the second fin 420, the first tube portion 21 is provided on the windward side, and the second tube portion 22 is provided on the leeward side. Wherein the windward side is located upstream of the leeward side in the airflow direction B. The first pipe portion 21 with weaker heat exchange capability is located on the windward side, and the second pipe portion 22 with stronger heat exchange capability is located on the leeward side, so that the heating can be enhanced under the low temperature condition. Specifically, as shown in fig. 22 and 24, the number of the medium flow channels 201 of the first pipe portion 21 is smaller than the number of the medium flow channels 201 of the second pipe portion 22, and the flow area of any one of the medium flow channels 201 of the first pipe portion 21 is larger than the flow area of any one of the medium flow channels of the second pipe portion 22. In the range of the first pipe portion 21, the air exchanges heat with the medium in the flat pipe 200, because the heat exchange capability is low, condensed water is not easy to appear, the moisture is removed, the temperature is reduced when the air flow passing through the first pipe portion 21 flows to the second pipe portion 22, when the air flow exchanges heat in the range of the second pipe portion 22, the temperature difference between the air flow and the second pipe portion 22 and the flat pipe 200 is reduced, condensed water is not easy to appear, the way that the upper wind side focuses on dehumidification and the lower wind side focuses on heat exchange can reduce the amount of condensed water and frost or the possibility of the occurrence of condensed water, reduces the influence of the condensed water and frost on the heat exchange performance of the heat exchanger, thereby strengthening the heat exchange capability, ensuring better heat absorption effect under the evaporation working condition, and strengthening the indoor heating effect of the air conditioner when the micro-channel heat exchanger is used as an outdoor unit of the air conditioner.

In the airflow direction B, one of the first tube portion 21 and the second tube portion 22 having a weaker heat exchange capability may be disposed corresponding to one of the first fin 410 and the second fin 420 having a weaker heat exchange capability, in other words, when the heat exchange capability of the first tube portion 21 is smaller than that of the second tube portion 22, the heat exchange capability of the first fin 410 may be simultaneously set smaller than that of the second fin 420 so as to superimpose and strengthen the heat exchange, drainage, and other performances of the heat exchanger.

As shown in fig. 17 to 20, alternatively, in some embodiments, the thickness of the side of the first tube portion 21 close to the second tube portion 22 is greater than the thickness of the side of the first tube portion 21 away from the second tube portion 22 along the first direction X; and/or the thickness of the second pipe portion 22 on the side close to the first pipe portion 21 is greater than the thickness of the second pipe portion 22 on the side away from the first pipe portion 21.

In some embodiments, as shown in fig. 17 to 20, the surface shape of one or both ends of the flat tube 200 may be an inclined surface or an arc surface. Thus, when the heat exchange assembly is applied to the evaporation working condition, part of water residue stays on the flat surface of the flat tube 200, namely the first side surface, and if the flat surface of the flat tube 200 is set to be an inclined surface or an arc surface, the water removal at the junction is accelerated.

Alternatively, as shown in fig. 17 to 20, the thickness of the first pipe portion 21 in the second direction Y gradually decreases from the side closer to the second pipe portion 22 to the side farther from the second pipe portion 22, and specifically, the first pipe portion 21 may include a first wall surface 211 and a second wall surface 212, the first wall surface 211 and the second wall surface 212 may be disposed opposite to each other in the second direction Y, the first wall surface 211 and the second wall surface 212 may be disposed gradually closer to each other from the side closer to the second pipe portion 22 to the side farther from the second pipe portion 22, and the first wall surface 211 may be an arc-shaped surface or an inclined surface along the first direction X, and the second wall surface 212 may be an arc-shaped surface or an inclined surface along the first direction X. The thickness change of the first pipe portion 21 can promote the water in the middle of the flat pipe 200 to move to the end of the first pipe portion 21 far away from the second pipe portion 22, which is beneficial to the drainage of condensed water or defrosting water.

Alternatively, as shown in fig. 19 to 20, the second pipe portion 22 gradually decreases in thickness in the second direction Y from the side closer to the first pipe portion 21 to the side farther from the first pipe portion 21. Specifically, the second pipe portion 22 may include a third wall 221 and a fourth wall 222, the third wall 221 and the fourth wall 222 being disposed opposite to each other in the second direction Y, the third wall 221 and the fourth wall 222 being disposed gradually closer to each other from a side closer to the first pipe portion 21 to a side farther from the first pipe portion 21, the third wall 221 and the fourth wall 222 being disposed in the first direction X, the third wall 221 being an arc-shaped surface or an inclined surface, and the fourth wall 222 being an arc-shaped surface or an inclined surface. The thickness change of the second pipe portion 22 can promote the water in the middle of the flat pipe 200 to move towards the end portion of the second pipe portion 22 away from the first pipe portion 21, which is beneficial to the drainage of condensed water or defrosting water.

Alternatively, in some embodiments, the flat tube 200 may be composed of expandable and non-expandable portions, i.e., one of the first and second tube portions 21, 22 may be connected to the corresponding fin by expansion, and the other may alternatively be connected to the corresponding fin by non-expansion, such as welding. The heat exchange assembly can be manufactured in a combined mode of welding and expansion joint, the welding fins and the flat tube 200 are good in compactness, and heat exchange is enhanced; the air expansion or liquid expansion fin directly adopts a fin with a pretreated hydrophilic layer, and the pretreated fin can ensure the long-acting property and the drainage performance of drainage, so that the expansion joint position can be used as a windward side to pre-dehumidify air. Wherein expansion joint refers to a connection mode that pressure is applied in the flat tube 200 to enable the flat tube 200 to deform outwards to expand and be in interference abutting connection with the fins so as to enable the fins to be fixed on the flat tube 200.

Specifically, in one embodiment, the first pipe portion 21 is an expandable portion, and the second pipe portion 22 is a welded portion.

As shown in fig. 31, a first rib 213 is provided in the first pipe portion 21, medium flow passages 201 are formed on both sides of the first rib 213, and the first rib 213 is provided to be curved in the second direction Y. A second rib plate 223 is arranged in the second pipe portion 22, two sides of the second rib plate 223 respectively form a medium flow channel 201, and the second rib plate 223 is arranged in a straight line along the second direction Y. The second direction Y intersects the first direction X and is perpendicular to the preset direction Z of the flat tube 200.

It should be noted that, the first end face 414 and the second end face 424 shown in fig. 31 are only shown as being mated in a plane, but it should be understood that the structure of the flat tube 200 shown in fig. 31 may also be applied to the structure of the concave-convex mating of the first end face 414 and the second end face 424.

The first tube portion 21 is made of a bent first rib plate, and by selecting a suitable material, for example, the first tube portion 21 and the first rib plate are made of aluminum, the first tube portion 21 can expand along the extending direction of the first rib plate under the action of internal pressure so as to be expanded and connected with the first fin 410.

In this specific embodiment, the processing procedure of the heat exchange assembly may be: inserting the second tube portion 22 into the second open groove 423 of the second fin 420, inserting the flat tube 200 and the collecting assembly 300 (specifically including the collecting pipe 310, etc., the flat tube 200 is communicated with the collecting pipe 310 so as to facilitate the flow and distribution of the refrigerant), and then welding the second tube portion 22, the collecting assembly 300 and the second fin 420 together through a furnace; dip-coating the welded second tube portion 22, the current collecting assembly 300 and the second fin 420 with a hydrophilic layer; then, the first fin 410 is assembled to the first tube portion 21 through the first open groove 413, and the flat tube 200 is filled with gas or liquid, so that the pressure in the flat tube 200 is increased, the first tube portion 21 is expanded outwards under the action of the pressure, the first tube portion 21 is in interference abutting contact with the first fin 410, and the first fin 410 is fixed on the first tube portion 21.

The first fin 410 does not need to be welded through a furnace, and the first fin 410 can be pretreated to process a hydrophilic layer, and particularly, the hydrophilic layer can be formed through roller coating. Since the hydrophilic layer is damaged by the through-furnace welding, the hydrophilic layer of the first fin 410 can ensure the drainage durability and drainage performance without passing through the through-furnace welding. The first fins 410 and the corresponding expandable first tube portions 21 may be disposed on the windward side, and the difference in temperature between the air flow on the windward side and the refrigerant of the flat tube 200 is relatively large, so that condensed water is relatively easy to occur, and the drainage performance of the heat exchange assembly is improved by the first fins 410 having relatively good hydrophilic layers being disposed on the windward side.

In the microchannel heat exchanger, the contact areas between the fins and the flat tubes 200 and between the flat tubes 200 and the collecting pipe 310 are small, and conventional welding is adopted, so that the process requirements are difficult to meet, and therefore, the microchannel heat exchanger adopts a high-temperature brazing technology, and the parts such as the fins, the flat tubes 200, the collecting pipe 310 and the like are assembled into a whole and are welded and formed in a furnace. The temperature in the high-temperature brazing furnace is higher than 600 ℃, and because the hydrophilic, hydrophobic or anti-corrosion coating on the surface of the fin is not high-temperature resistant, the hydrophilic, hydrophobic or anti-corrosion coating on the surface of the fin can only be subjected to overall dip coating treatment after the welding forming of the heat exchanger, compared with the roll coating of the fin coating (the roll coating of the aluminum foil before the forming of the fin), the dip coating process is more complex, the coating adhesion is not as strong as the roll coating, the durability is low, the service life is short, the uniformity of the coating is poor, the average thickness is thicker, the influence on the heat exchange performance is larger, and the dip coating cost is higher than that of the roll coating. In the embodiment, the expansion joint and welding combination process is adopted, so that compared with the mode of all welding the fins, the hydrophilic layer of part of the fins has better drainage performance, the cost is reduced, and the process is simplified.

In some embodiments, the first tube portion 21 and the second tube portion 22 may be disposed at an angle greater than zero, i.e., the first tube portion 21 is disposed obliquely relative to the second tube portion 22 in the second direction Y, and correspondingly, the first open slot 413 is disposed obliquely relative to the second open slot 423. The first pipe portion 21 and the second pipe portion 22 are disposed to be inclined with respect to each other, and when the flat pipe 200 is disposed horizontally, at least one of the first pipe portion 21 and the second pipe portion 22 has an inclination angle, which can facilitate drainage of condensed water or defrost water.

Alternatively, in some embodiments, as shown in fig. 14 to 26, a connection portion 23 is provided between the first tube portion 21 and the second tube portion 22; the connection portion 23 is provided with a drain hole 231, and/or the connection portion 23 is provided with a protrusion 232, and the protrusion 232 may have a structure in which the circumferential side walls protrude from the surface of the flat tube 200, or may have an inclined inclination structure in which one side is excessively connected. The connection part 23 is located between the first fin 410 and the second fin 420, and there may be a gap between the first fin 410 and the second fin 420, and the drainage hole 231 on the connection part 23 or the connection part 23 protruding may improve drainage between the first fin 410 and the second fin 420.

As shown in fig. 15 to 16, in some embodiments, the connection portion 23 is provided with a protrusion 232. Specifically, the connection portion 23 may be a protrusion 232 formed on the surface of the flat tube 200, and may be triangular, circular arc, trapezoid, or the like. One end of the connecting portion 23 is connected with the first pipe portion 21 and the second pipe portion 22, the other end of the connecting portion 23 protrudes, the cross-sectional area of the protruding end of the connecting portion 23 can be smaller than the cross-sectional area of one end of the connecting portion 23 connected with the first pipe portion 21 and the second pipe portion 22, and the cross-sectional area of the connecting portion 23 can be gradually expanded from the protruding end to the connecting end so as to guide condensed water or defrosting water and the like.

It can be understood that when the micro-channel heat exchanger operates under the evaporation working condition, part of water remains on the surface of the flat tube 200 at the junction of the first fin 410 and the second fin 420, and the protrusion 232 or the inclination angle is arranged on the junction surface, so that the water film can be broken and the water at the junction can be removed rapidly. And the protrusion 232 or the inclination angle has a positioning function, so that the insertion position of the first fin 410 and the first tube part 21 and the insertion position of the second fin 420 and the second tube part 22 can be positioned, and the first fin 410 and the second fin 420 are prevented from being over-inserted with the flat tube 200, so that the first fin 410 or the second fin 420 is prevented from being damaged.

As shown in fig. 14, in some embodiments, the connection part 23 is provided with a drain hole 231, and the drain hole 231 penetrates opposite sides of the flat tube 200 to facilitate drainage. The drain hole 231 may be a strip-shaped hole continuous along the preset direction Z, and as shown in fig. 14, the drain hole 231 may be a plurality of holes spaced along the preset direction Z.

When the micro-channel heat exchanger operates under the evaporation working condition, part of water remains on the surface of the flat tube 200 at the junction of the first fin 410 and the second fin 420, and if the drainage hole 231 is arranged in the middle of the flat tube 200, the drainage of the water at the junction is accelerated.

It should be noted that, in some embodiments, both the drain hole 231 and the protrusion 232 or the inclination angle may be disposed on the connection portion 23, for example, the protrusion 232 or the inclination angle may be disposed between two adjacent drain holes 231.

In some embodiments, the first tube portion 21 is welded to the first fin 410.

In some embodiments, the first tube portion 21 is expansion-connected to the first fin 410.

In some embodiments, the first tube portion 21 is adhesively connected to the first fin 410.

In some embodiments, the second tube portion 22 is welded to the second fin 420.

In some embodiments, the second tube portion 22 is expansion-connected to the second fin 420.

In some embodiments, the second tube portion 22 is adhesively connected to the second fin 420.

In some embodiments, the surface of the flat tube 200, the surface of the first fin 410, and/or the surface of the second fin 420 is provided with a hydrophilic layer to enhance drainage of the heat exchange assembly.

Note that, in the case where the first tube portion 21 and the first fin 410 and the second fin 420 and the second tube portion 22 are welded, the assembly process of the heat exchange assembly includes: the first fin 410 is inserted into the first tube portion 21 through the first open slot 413, the second fin 420 is inserted into the second tube portion 22 through the second open slot 423, and then the whole of the first fin 410, the flat tube 200 and the second fin 420 is subjected to furnace welding, and after the furnace welding, the whole structure is subjected to dip-coating hydrophilic layer.

In the case where the first tube portion 21 and the first fin 410 and the second fin 420 and the second tube portion 22 are both expanded, the assembly process of the heat exchange assembly includes: two ends of the flat tube 200 are connected with the current collecting assembly 300 and welded through a furnace; then, the flat tube 200 welded by passing through the furnace is inserted with a first fin 410 pretreated with a hydrophilic layer through a first open slot 413 at a first side, inserted with a second fin 420 pretreated with a hydrophilic layer through a second open slot 423 at a second side, and then the flat tube 200 is inflated or filled with liquid, so that the flat tube 200 is expanded with the first fin 410 and the second fin 420. The expansion connection of the first tube part 21 and the first fin 410 and the expansion connection of the second fin 420 and the second tube part 22 are more applicable to heat exchangers with quick drainage and long-acting needs.

In some embodiments, the heat exchange component may be made of aluminum, and in particular, the first fin 410, the second fin 420, and the flat tube 200 may all be made of aluminum.

Alternatively, in one embodiment, referring to fig. 1 to 13, the first fin 410 includes a first guide portion 411 and a first mounting portion 412 that are connected to each other, a first open slot 413 is disposed on a side of the first mounting portion 412 away from the first guide portion 411, a projection of the first open slot 413 along a first direction X toward a side of the first guide portion 411 is located between two ends of the first guide portion 411 along a second direction, the first direction X is a direction in which the first side faces the second side, and the first direction X intersects with a preset direction Z and the second direction Y in two pairs. The second fin 420 includes a second guiding portion 421 and a second mounting portion 422 that are connected to each other, a second open slot 423 is disposed on a side of the second mounting portion 422 away from the second guiding portion 421, and a projection of the second open slot 423 toward the side of the second guiding portion 421 along the first direction X is located between two ends of the second guiding portion 421 along the second direction. The first fin 410 is disposed on a first side of the flat tube 200, and a side of the first mounting portion 412 away from the first guiding portion 411 is disposed facing the flat tube 200, the first side of the flat tube 200 is inserted into the first open slot 413, the second fin 420 is disposed on a second side of the flat tube 200, and a side of the second mounting portion 422 away from the second guiding portion 421 is disposed facing the flat tube 200, and the second side of the flat tube 200 is inserted into the second open slot 423.

The first guide portion 411 may be understood as a portion of the first fin 410 where the first open groove 413 is not provided, and the first guide portion 411 may include all or part of the position of the first portion 431 of the first fin 410. The first mounting portion 412 and the first guiding portion 411 may be integrally configured, that is, the first mounting portion 412 and the first guiding portion 411 are two portions of the same first fin 410, and both may be integrally formed. The second flow guide 421 may be understood as a portion of the second fin 420 where the second open groove 423 is not provided, and the second flow guide 421 may include all or part of the position of the first portion 431 of the second fin 420. The second mounting portion 422 and the second guide portion 421 may be integrally configured, that is, the second mounting portion 422 and the second guide portion 421 are two portions of the second fin 420, which may be integrally formed. The first flow guiding portion 411 may have a thin plate structure, and the second flow guiding portion 421 may have a thin plate structure.

When the two sides or one side of the fin assembly 400 is discontinuous, the micro-channel heat exchanger comprising the heat exchange assembly is applied to an evaporation working condition, namely, a working condition used as an evaporator, condensate water is easy to be discharged and unsmooth, so that the condensate water is remained on the flat tubes 200 and the fins, the wind resistance of the heat exchanger is increased, and the heat exchange performance of the heat exchanger is reduced; in addition, at low temperature, the micro-channel heat exchanger is easy to frost and has poor defrosting and draining properties, so that the micro-channel heat exchanger is difficult to be applied to an outdoor unit of an air conditioner, for example, is difficult to be used as a heat pump air conditioner outdoor unit. In this embodiment, the first fins 410 and the second fins 420 are beneficial to draining condensed water and defrosting water from the two side edges of the flat tube 200, and reduce the amount of condensed water and defrosting water remained on the flat tube 200 and the fins, thereby reducing the influence on wind resistance and heat exchange performance.

In the heat exchange assembly of the present embodiment, when the heat exchange assembly is arranged, the preset direction Z may be set to be a substantially horizontal direction, the first direction X is a substantially horizontal direction, and the second direction Z is a substantially vertical direction, in other words, the flat tube 200 is arranged along the horizontal direction, and the first fins 410 and the second fins 420 are respectively disposed on two sides of the flat tube 200 in the horizontal direction, so that the first fins 410 and the second fins 420 can be arranged along the substantially vertical direction. The projection of the first opening slot 413 to the side where the first guide portion 411 is located along the first direction X is located between two ends of the first guide portion 411, that is, the position of the first guide portion 411 corresponding to the first opening slot 413 is continuous, so that the first guide portion 411 may extend from one side to the other side of the flat tube 200 along the second direction Y (the second direction Y intersects the first direction X and intersects the preset direction Z), that is, referring to fig. 2, 4 and 6, and may penetrate through the upper and lower sides. In this way, the first diversion portion 411 is continuous in the direction perpendicular to the first direction X and the preset direction Z, the first diversion portion 411 is not broken in the direction perpendicular to the first direction X and the preset direction Z due to the arrangement of the flat tube 200, and condensed water or defrost water is not easy to collect on the first side of the flat tube 200 due to the broken section, so that the condensed water or defrost water in the first fin 410 or the flat tube 200 is easily drained in time along the first diversion portion 411. The projection of the second open groove 423 toward the side of the second flow guiding portion 421 along the first direction X is located between two ends of the second flow guiding portion 421, that is, the position of the second flow guiding portion 421 corresponding to the second open groove 423 is continuous. In this way, the second flow guiding portion 421 is continuous in the direction perpendicular to the first direction X and the preset direction Z, so that the second flow guiding portion 421 can extend from one side to the other side of the flat tube 200 in the second direction Y, that is, as shown in fig. 2, 4 and 6, the second flow guiding portion 421 can penetrate through the upper and lower sides, and is not broken in the direction perpendicular to the first direction X and the preset direction Z due to the arrangement of the flat tube 200, and condensed water or frosted water is not easily collected on the second side of the flat tube 200 due to the broken section, which is beneficial for timely draining of the condensed water or frosted water in the second fin 420 or the flat tube 200 along the second flow guiding portion 421.

The heat exchange assembly of the embodiment can timely remove condensed water or defrosting water from two sides of the flat tube 200, so that the micro-channel heat exchanger applying the heat exchange assembly can be applied to heat pump air conditioner outdoor units and other products. Compared with the conventional round tube fin type heat exchanger, the micro-channel heat exchanger is more compact and efficient, is applied to the heat pump air conditioner outdoor unit to replace the conventional round tube fin type heat exchanger, can improve energy efficiency, reduce refrigerant filling quantity and is beneficial to energy conservation and emission reduction on the basis of meeting basic performance requirements.

In a specific embodiment, referring to fig. 1 to 13, the flat tubes 200 are arranged in a substantially horizontal direction, the second direction Y is a substantially vertical direction, and the first direction X and the preset direction Z are both substantially horizontal directions. The first guide portion of the first fin 410 and the second guide portion of the second fin 420 are continuous in the vertical direction, which is advantageous for timely draining condensed water and defrost water on the heat exchange assembly from the first fin 410 and the second fin 420.

In order to improve the heat exchange efficiency of the heat exchange assembly, as shown in fig. 26 to 30, the fin assembly 400 of the present embodiment may also be bent. Specifically, the flat tube 200 has a first side 210, the first side 210 extends along a preset direction Z, the fin assembly 400 is connected to the first side 210, and on the first side 210, the fin assembly 400 extends along a first direction X, and the first direction X intersects the preset direction Z. In other words, the first side 210 also extends in the first direction X in which the fin assembly 400 is bent and extended, and the fin assembly 400 is wavy and bent in the preset direction Z.

The fin assembly 400 may be attached to the first side 210 by bending and extending along the first direction X on the first side 210, and may be bent and extending along the first direction X on the surface of the first side 210, and a connection line formed between the fin assembly 400 and the first side 210 may be bent and extending along the first direction X.

According to the heat exchange assembly of the embodiment, when the heat exchange assembly is used, external media such as air flow (the subsequent external media are mainly illustrated by taking the air flow as an example) can flow through the heat exchange assembly along the air flow direction parallel to the first direction, the fin assemblies are arranged in a bending mode in the first direction, the length of the flow channels of the external media can be prolonged, and the heat exchange efficiency of the refrigerants in the flat tubes and the external media is improved, so that the heat exchange efficiency of the microchannel heat exchanger using the heat exchange assembly is improved.

Optionally, the flat tube 200 further includes a second side 220, where the second side 220 extends along the preset direction Z, and the second side 220 is adjacent to and intersecting with the first side 210; the fin assembly 400 is connected to the first side 210 and the second side 220, respectively.

Referring to fig. 21 to 24, the flat tube 200 includes two second side surfaces 220 disposed opposite to each other and two first side surfaces 210 disposed opposite to each other, and both ends of the two second side surfaces 220 are connected to both ends of the two first side surfaces 210, respectively. The fin assembly 400 may be connected to only one first side 210, or may be connected to both first sides 210, and the fin assembly 400 may be connected to one of the second sides 220, or may be connected to both second sides 220. Specifically, an open slot may be formed on the fin assembly 400, the flat tube 200 is inserted into the open slot, and the slot wall of the open slot of the fin assembly 400 contacts the first side 210 and the second side 220, so that the fin assembly 400 is connected with the first side and the second side 220.

The fin assembly 400 is connected with the first side 210 and the second side 220, so that the flat tube 200 can transfer heat to the fin assembly 400 through the first side 210 and the second side 220, the heat transfer area between the flat tube 200 and the fin assembly 400 is increased, and the heat exchange efficiency of the heat exchange assembly is improved.

Alternatively, fin assembly 400 may be curved along the wider sides of flat tube 200. Specifically, as shown in fig. 1 to 31, the preset direction Z coincides with the length direction of the first side 210 and the length direction of the second side 220, the width direction of the first side 210 coincides with the first direction X, the width of the first side 210 is greater than the size of the second side 220 along the second direction Y, and the second direction Y intersects with the first direction X and the preset direction Z, respectively.

The first direction X is the width direction of the first side 210, and is also the width direction of the flat tube 200, the second direction Y is the thickness direction of the flat tube 200, and the dimension of the second side 220 along the second direction Y is the thickness of the flat tube 200. The width of the first side 210 being greater than the width of the second side 220 is understood to mean that the width of the flat tube 200 is greater than the thickness, and the fin assembly 400 is bent in the width direction of the flat tube.

The fin assembly 400 is arranged along the wider side surface of the flat tube 200 in a bending manner, so that the fin assembly 400 is convenient to assemble, and the fin assembly 400 can be longer in the extending length along the airflow flowing direction B, thereby being beneficial to the improvement of the heat exchange efficiency of the heat exchange assembly.

In one implementation, referring to fig. 26 to 30, the fin assembly 400 includes a first portion 431 and a second portion 432 sequentially disposed along a first direction X, the first portion 431 and the second portion 432 are each disposed in a sheet shape, one ends of the first portion 431 and the second portion 432, which are close to each other, are correspondingly connected, and a plane in which the first portion 431 is disposed intersects a plane in which the second portion 432 is disposed.

Wherein the first portion 431 and the second portion 432 each intersect the first side 210, and the first portion 431 is connected to the first side 210, and the second portion 432 is also connected to the first side 210. Specifically, it may be that the first portion 431 and the second portion 432 are disposed perpendicularly to the first side 210. The first portion 431 and the second portion 432 may be of unitary construction.

The plane of the first portion 431 and the plane of the second portion 432 intersect, so that the fin assembly 400 is folded along the first direction X. Under the guiding action of the first portion 431 and the second portion 432 of the fin assembly 400, when the air flows along the first direction X toward the fin assembly 400, the air can flow along the bent flow channel, compared with the linear flow channel, the circulating length is increased, the heat exchange area of the corresponding fin assembly 400 is increased, and the heat exchange efficiency of the heat exchange assembly is improved.

Optionally, the included angle between the first portion and the second portion may be an obtuse angle, so as to improve the smoothness of the gas flow.

In one embodiment, referring to fig. 26 to 30, in the case where the fin assembly 400 includes the first fin 410 and the second fin 420, at least one of the first fin 410 and the second fin 420 is provided to be bent in the first direction X.

In a specific embodiment, referring to fig. 26 to 30, the first fin 410 and the second fin 420 respectively include a first portion 431 and a second portion 432, the second portion 432 of the first fin 410 and the second portion 432 of the second fin 420 are disposed close to each other, the first portion 431 of the first fin 410 is disposed at a side of the second portion 432 of the first fin 410 away from the second fin 420, and the first portion 431 of the second fin 420 is disposed at a side of the second portion 432 of the second fin 420 away from the first fin 410. The first portion 431 of the first fin 410 is disposed parallel or coplanar with the first portion 431 of the second fin 420. As shown in fig. 26 and 27, the second portion of the first fin 410 is oriented in a first orientation with respect to the first portion 431 of the first fin 410, and the second portion 432 of the second fin 420 is oriented in a second orientation with respect to the first portion 431 of the second fin 420, which may be the same arrangement as the second orientation, i.e., the second portion 432 of the first fin 410 and the second portion 432 of the second fin 420 are bent toward the same side of the first fin 410 and the first portion 431 of the second fin 420, e.g., both bent downward as shown in fig. 26 and 27. As shown in fig. 28 to 29, the first orientation and the second orientation may also be opposite, i.e. the second portion 432 of the first fin 410 and the second portion 432 of the second fin 420 are bent towards different sides of the first fin 410 and the first portion 431 of the second fin 420, e.g. the second portion 432 of the first fin 410 is bent downward with respect to the first portion 431 of the first fin 410 and the second portion 432 of the second fin 420 is bent upward with respect to the first portion 431 of the second fin 420 as shown in fig. 28 and 29.

Wherein the second portion 432 of the first fin 410 is rotated by an angle corresponding to a clockwise or counterclockwise direction relative to the first portion 431 of the first fin 410; the second portion 432 of the second fin 420 is rotated by an angle corresponding to a clockwise or counterclockwise rotation relative to the first portion 431 of the second fin 420, i.e., the first fin 410 and the second fin 420 of the fin assembly 400 are rotated by an angle in the middle region adjacent to each other. The first portion 431 of the first fin 410 and the first portion of the second fin 420 may be disposed in parallel with the first direction X.

Optionally, an angle between the second portion 432 of the first fin 410 and the first portion 431 of the first fin 410 is a first angle α1, an angle between the second portion 432 of the second fin 420 and the first portion 431 of the second fin 420 is a second angle α2, and the degrees of the first angle α1 and the degrees of the second angle α2 may be the same or different.

In one embodiment, the degrees of the first included angle α1 and the degrees of the second included angle α2 may be set to be the same so as to process the first fin 410 and the second fin 420 using the same mold, reduce the number of molds, and reduce the production investment cost.

When some micro-channel heat exchangers are assembled, two ends of the flat tube 200 penetrating through the fin assembly 400 are inserted into the collecting tube 310 and connected with the collecting tube 310, so that the inner diameter of the collecting tube 310 is determined by the width of the flat tube 200, the wider the flat tube 200 is, the larger the inner diameter of the collecting tube 310 is, for example, the width range of the flat tube 200 of the micro-channel heat exchanger of an outdoor unit is 12 mm to 20 mm, the corresponding inner diameter range of the collecting tube 310 is 15 mm to 25mm, and the inner volume of the micro-channel heat exchanger is correspondingly increased. Compared with the conventional heat exchanger, in the use process, the refrigerant of the micro-channel heat exchanger often exists in the collecting pipe 310, the refrigerant storage amount is increased along with the increase of the inner diameter of the collecting pipe 310, and in order to cater for the size of the flat pipe 200, the size of the collecting pipe 310 is correspondingly increased, so that the refrigerant amount in the micro-channel heat exchanger is more, the waste of the refrigerant amount is caused, and the cost is increased. In some micro-channel heat exchangers, the refrigerant filling amount is limited, and in such micro-channel heat exchangers, the size of the collecting pipe 310 is difficult to achieve both the width and the filling amount of the flat tube 200 during processing.

In view of the above, as shown in fig. 39 to 50, the heat exchange assembly optionally further includes an adapter member including a member body 100, in which a passage penetrating both ends of the member body 100 is formed in the member body 100, one end of the passage forms a flat interface 111, and the other end of the passage forms a circular interface 114.

The flat connection 111 is understood to mean a connection with a flow cross section which differs in size in two mutually perpendicular directions, and in particular the flat connection 111 may be a rectangular connection, an oval connection, etc. The flat interface 111 is generally used for connection with the flat tube 200 of the microchannel heat exchanger, and in practical design, the shape of the flat interface 111 may be adapted to the flat tube 200, specifically to the end of the flat tube 200, and to the dimensions of the end of the flat tube 200. The flat tube 200 can be inserted into the flat interface 111 and is fixedly connected with the adapting component in a sealing way, and particularly can be connected with the adapting component in a welding way.

The circular port 114 is a port having a circular flow cross section. The circular interface 114 is adapted to connect with a flat tube connection of the manifold assembly 300. Specifically, the current collecting assembly 300 may include a current collecting pipe 310, and the flat pipe connection portion may be a current dividing hole on a side wall of the current collecting pipe 310, or may be a current dividing pipe 330 connected to the current collecting pipe 310. The current collecting assembly 300 may also include a current divider 320, and the flat tube connection portion may be a current dividing hole of the current divider 320 or a current dividing tube 330 connected to the current divider 320.

The flow cross section refers to a cross section of the component perpendicular to the medium flow direction (the medium flow direction can be understood with reference to a preset direction Z marked on the adapter part). It is understood that the flow cross-section of the flat port 111 is a cross-section of the flat port 111 in a direction perpendicular to the medium flow direction Z within the flat port 111, and the flow cross-section of the circular port 114 is a cross-section of the circular port 114 in a direction perpendicular to the medium flow direction Z within the circular port 114.

The medium flow direction Z, i.e. the direction of flow of the medium through the adapter part, corresponds to the direction from the circular port 114 to the flat port 111. When the adapting component is applied to the micro-channel heat exchanger, the medium is a refrigerant. The center lines of the circular interface 114, the necking section 113, the mixing section 112 and the flat interface 111 along the medium flowing direction Z can be arranged in a collinear manner, so as to reduce the flow velocity loss of the medium caused by the conversion of the flowing direction, and enable the medium to flow stably.

The adapting piece of this embodiment may be applied to a microchannel heat exchanger, where the flat interface 111 may be used to connect with the flat tube 200 of the microchannel heat exchanger, the round interface 114 may be connected with the current collecting component 300 of the microchannel heat exchanger, such as the header 310, and the current collecting component 300 is connected with the flat tube 200 through the adapting piece, where the size of the current collecting component 300 is not affected by the size of the flat tube 200, so that the size of the current collecting component 300 may be processed according to the actually required amount of refrigerant, thereby avoiding storing excessive refrigerant in the current collecting component 300 and reducing the cost. When the filling amount of the refrigerant is required, the current collecting assembly 300 can be sized according to the filling amount of the refrigerant when being arranged, then the circular interface 114 of the adapting part is arranged to be matched with the flat pipe connecting part of the current collecting assembly 300, and the size of the current collecting assembly 300 cannot influence the size of the flat pipe 200, so that the wider size of the flat pipe 200 can be considered, the heat exchange requirement can be met, and the current collecting assembly 300 can be arranged according to the filling amount of the refrigerant, and the requirement of low filling amount of the refrigerant can be met.

A plurality of medium flow channels 201 (i.e., medium flow channels 201 are flow holes for flowing a refrigerant in the flat tube 200) are generally disposed in the flat tube 200 of the microchannel heat exchanger, when the refrigerant flows from the header assembly 300, such as the header 310, to the flat tube 200, the refrigerant in the header 310 cannot be sufficiently and uniformly distributed into the medium flow channels 201 of the same flat tube 200, and the problem of uneven refrigerant distribution is easily caused in the plurality of medium flow channels 201 in the flat tube 200, thereby affecting the heat exchange efficiency of the microchannel heat exchanger.

The channel formed in the component body 100 of the present embodiment may further include a necking section 113 and a mixing section 112, the necking section 113 and the mixing section 112 being disposed between the circular port 114 and the flat port 111 and being sequentially disposed in a direction from the circular port 114 to the flat port 111, the necking section 113 having a flow cross section smaller than a flow cross section of the mixing section 112 and a flow cross section of the circular port 114.

The necking section 113 and the mixing section 112 are part of the channel, so the necking section 113 and the mixing section 112 are also channel structures.

The flow cross section of the necking section 113 is smaller than the flow cross section of the circular interface 114, and it is understood that the flow cross section of the necking section 113 is smaller than the flow cross section of the circular interface 114, specifically, the dimensions of the necking section 113 and the circular interface 114 in at least one direction are different, and the dimension of the necking section 113 is smaller than the dimension of the circular interface 114. Similarly, the flow cross section of the necking section 113 is smaller than the flow cross section of the mixing section 112, and it is understood that the flow cross section of the necking section 113 is smaller than the flow cross section of the mixing section 112, and specifically, the dimensions of the necking section 113 and the mixing section 112 in at least one direction may be different, and the dimensions of the necking section 113 are smaller than the dimensions of the mixing section 112.

The flow cross section of the circular port 114 is generally adapted to the flat tube connection portion of the current collecting assembly 300, specifically, when the flat tube connection portion of the current collecting assembly 300 is the shunt tube 330, the flow cross section of the circular port 114 is matched to the outer wall of the shunt tube 330, so that the shunt tube 330 can be inserted into the circular port 114 in a matched manner.

It should be noted that the flow cross section of the mixing section 112 may also be generally set to be larger than the flow cross section of the circular port 114.

The switching part is provided with the necking section 113 and the mixing section 112, the flowing speed of the refrigerant in the necking section 113 is increased, and the refrigerant can be mixed in the mixing section 112, so that the refrigerant flowing through the switching part can be uniformly distributed into each medium flow channel 201 of the flat tube 200, the distribution uniformity of the refrigerant in the flat tube 200 is improved, and the heat exchange efficiency of the micro-channel heat exchanger is improved. For example, when the refrigerant flows into the flat tube 200 from the current collecting assembly 300 through the adapting component, the flow area of the necking section 113 is smaller when the refrigerant passes through the necking section 113, the refrigerant can be accelerated and then flows into the mixing section 112, the flow speed of the refrigerant is ensured, and after the flow speed of the refrigerant is increased, the mixing and filling of the refrigerant in the mixing section 112 are facilitated; because the space of the mixing section 112 is larger, the refrigerant entering the mixing section 112 can be mixed at the space and the refrigerant is filled in the mixing section 112, so that the refrigerant can uniformly enter the medium flow channels 201 of the flat tube 200, the distribution uniformity of the refrigerant is improved, and the heat exchange efficiency of the micro-channel heat exchanger is improved.

According to some embodiments of the present application, optionally, the flow cross-section of the mixing section 112 is larger than the flow cross-section of the flat interface 111.

The flow cross section of the flat interface 111 is generally adapted to the end of the flat tube 200, the flow cross section of the flat interface 111 is smaller than the flow cross section of the mixing section 112, it is understood that the flow cross section of the flat interface 111 has an area smaller than the flow cross section of the mixing section 112, specifically, the dimensions of the flat interface 111 and the mixing section 112 in at least one direction may be different, and the dimensions of the flat interface 111 are smaller than the dimensions of the mixing section 112.

In this embodiment, the flow cross section of the mixing section 112 is set to be larger than the flow area of the flat interface 111, so that the refrigerant flows from the mixing section 112 into the flat tube 200 connected with the flat interface 111, the refrigerant distribution among the plurality of medium flow channels 201 of the flat tube 200 is facilitated, the uniformity of refrigerant distribution in the flat tube 200 is improved, and the heat exchange effect of micro-channel heat exchange is improved.

According to some embodiments of the present application, the mixing section 112 is optionally provided in a flat configuration.

As shown in fig. 39-42, the mixing section 112 may be flat shaped, the same as or similar to the shape of the flat interface 111.

As shown in fig. 46 and 47, the mixing section 112 is arranged in a flat shape, so that when the microchannel heat exchanger has a plurality of flat tubes 200 arranged in parallel, the space occupied by the mixing section 112 in the direction between the flat tubes 200 is reduced, and when each flat tube 200 is connected with an adapting member, mutual interference between adjacent adapting members can be avoided.

According to some embodiments of the present application, the reduced mouth sections 113 are optionally provided in a circular configuration.

As shown in fig. 39 to 42, the reduced section 113 is circular, and the diameter of the reduced section 113 is smaller than the diameter of the circular interface 114. Wherein, since the necking section 113 and the circular interface 114 are both part of the channel, the diameter of the necking section 113, that is, the inner diameter of the part body 100 where the necking section 113 is formed, is the inner diameter of the necking section 103, as shown in fig. 41 and 42; the diameter of the circular port 114, i.e., the inner diameter of the component body 100 where the circular port 114 is formed, is shown in fig. 41 and 42, and specifically, the inner diameter of the circular port 114.

It can be understood that the necking section 113 is circularly arranged, which is favorable for collecting and flowing the refrigerant, and further can improve the accelerating effect of the refrigerant in the necking section 113.

Optionally, in some embodiments of the present application, the component body 100 includes a flat connection portion 101, a mixing portion 102, a necking portion 103, and a circular connection portion 104 that are sequentially disposed and connected, the flat interface 111 is disposed on the flat connection portion 101, the mixing section 112 is disposed on the mixing portion 102, the necking portion 113 is disposed on the necking portion 103, and the circular interface 114 is disposed on the circular connection portion 104.

As shown in fig. 41, the channel formed in the flat connection portion 101 is a flat interface 111, the flat connection portion 101 is also provided in a flat shape, and the shape of the flat connection portion 101 may be matched with the shape of the flat interface 111, that is, the inner wall surface of any position of the flat connection portion 101 is parallel to the outer wall surface of the corresponding position of the inner wall surface, and the center of the flat connection portion 101 is the same as the center of the flat section. The channel formed in the mixing section 102 is a mixing section 112, and when the mixing section 112 is arranged in a flat shape, the mixing section 102 may also be arranged in a flat shape, specifically, the shape of the mixing section 102 may be matched with the shape of the mixing section 112, that is, the inner wall surface at any position of the mixing section 102 is arranged in parallel with the outer wall surface at the corresponding position of the inner wall surface, and the center of the mixing section 102 is the same as the center of the mixing section 112. The channel formed in the reduced portion 103 is a reduced portion 113, and when the reduced portion 113 is circularly arranged, the reduced portion 103 may be circularly arranged, specifically, the shape of the reduced portion 103 may be matched with the shape of the reduced portion 113, and the reduced portion 103 and the reduced portion 113 are coaxially arranged (axis is the center line in the medium flowing direction Z). The channel formed in the circular connecting portion 104 is a circular interface 114, the cross section of the circular connecting portion 104 is circular, that is, the circular connecting portion 104 is a circular pipe, the shape of the circular connecting portion 104 can be matched with the shape of the circular interface 114, and the circular connecting portion 104 and the circular interface 114 are coaxially arranged.

The component body 100 of the present embodiment is provided with the circular connecting portion 104, the shrinkage portion 103, the mixing portion 102 and the flat connecting portion 101 according to the set shape of the channel, so that the component body 100 is consistent or basically consistent with the shape of the channel, the space occupied by the component body 100 is reduced, the consumable of the component body 100 is reduced, and the production cost is saved.

As shown in fig. 39 to 42, the wall thicknesses of the circular connecting portion 104, the reduced-diameter portion 103, the mixing portion 102, and the flat connecting portion 101 may be the same or substantially the same, so that the dimensional relationship between the cross section of the circular connecting portion 104, the cross section of the reduced-diameter portion 103, the cross section of the mixing portion 102, and the cross section of the flat connecting portion 101 is the same as the dimensional relationship between the flow cross section of the circular interface 114, the flow cross section of the reduced-diameter portion 113, the flow cross section of the mixing portion 112, and the flow cross section of the flat interface 111.

Wherein cross section refers to a cross section along a direction perpendicular to the medium flow direction Z, e.g. the cross section of the circular connection 104 is a cross section of the circular connection 104 along a direction perpendicular to the medium flow direction Z, the cross section of the circular connection 104 being parallel to the flow cross section of the circular interface 114.

The circular connecting portion 104, the tapered portion 103, the mixing portion 102 and the flat connecting portion 101 may be directly connected in order or may be integrally constructed. The circular connection 104, the constriction 103, the mixing section 102 and the flat connection 101 may also be connected by means of a transition.

Specifically, optionally, a first transition portion 105 is connected between the flat connection portion 101 and the mixing portion 102, a channel in the first transition portion 105 forms a first transition section 115, one end of the first transition section 115 is communicated with the mixing section 112, and the other end of the first transition section 115 is communicated with the flat interface 111. Referring to fig. 39 to 42, in the direction from the flat connection portion 101 to the mixing portion 102, the cross section of the first transition portion 105 gradually increases, the flow cross section of the first transition portion 115 formed by the first transition portion 105 gradually increases, and the flow cross section of the end of the first transition portion 115 connected to the mixing portion 112 is the same as the flow cross section of the mixing portion 112, and the flow cross section of the end of the first transition portion 115 connected to the flat interface 111 is the same as the flow cross section of the flat interface 111.

The first transition 105 may be integrally constructed with the flat connection 101 and the mixing section 102. The first transition section 115 may be provided in a flat shape, and specifically, the first transition section 115 may be in a flat shape having a flow cross section identical to that of the flat connection portion 101. The provision of the first transition 105 facilitates the flow of medium (i.e. coolant) between the flat connection 111 and the mixing section 112.

Optionally, a second transition portion 106 is connected between the necking portion 103 and the mixing portion 102, a channel in the second transition portion 106 forms a second transition section 116, one end of the second transition section 116 is communicated with the mixing section 112, and the other end of the second transition section 116 is communicated with the necking section 113. Referring to fig. 39 to 42, the cross section of the second transition portion 106 gradually decreases in the direction from the mixing portion 102 to the necking portion 103, the flow cross section of the second transition portion 116 formed by the second transition portion 106 gradually decreases, and the flow cross section of the end of the second transition portion 116 connected to the mixing portion 112 is the same as the flow cross section of the mixing portion 112, and the flow cross section of the end of the second transition portion 116 connected to the necking portion 113 is the same as the flow cross section of the necking portion 113.

The second transition portion 106 may be integrally constructed with the pinch portion 103 and the mixing portion 102. The second transition section 116 may be provided in a flat shape, as shown in fig. 39 and 40, and the second transition portion 106 includes a first portion having an elliptical cross section and a second portion having a cross section identical to the cross section of the mixing portion 102, the first portion being connected to the pinch portion 103, the second portion being connected to the mixing portion 102, and the first portion being connected to the second portion and being integrally formed. As shown in fig. 41, the flow cross section of the second transition section 116 corresponding to the first portion is substantially elliptical, and the flow cross section of the second transition section 116 corresponding to the second portion is formed to have a shape that matches the flow cross section of the mixing section 112.

The provision of the second transition 106 facilitates the flow of medium (i.e., refrigerant) between the reduced-diameter section 113 and the mixing section 112.

Optionally, a third transition part 107 is connected between the necking part 103 and the circular connecting part 104, a channel in the third transition part 107 forms a third transition section 117, one end of the third transition section 117 is communicated with the circular interface 114, and the other end of the third transition section 117 is communicated with the necking section 113. Referring to fig. 39 to 42, the cross section of the third transition portion 107 gradually increases from the necking portion 103 to the circular connecting portion 104, the flow cross section of the third transition portion 117 formed by the third transition portion 107 gradually increases, and the flow cross section of the end of the third transition portion 117 connected to the circular port 114 is the same as the flow cross section of the circular port 114, and the flow cross section of the end of the third transition portion 117 connected to the necking portion 113 is the same as the flow cross section of the necking portion 113.

The second transition portion 106 may be integrally constructed with the necked portion 103 and the rounded connecting portion 104. The third transition section 117 may be circularly arranged. The provision of the second transition 106 facilitates the flow of medium (i.e. coolant) between the constriction 113 and the circular interface 114.

Wherein the channels formed by the component body 100 may extend in a straight line such that the medium flow direction Z within the component body 100 is the same. Specifically, as shown in fig. 41 and 42, the flow directions of the medium at the circular interface 114, the third transition section 117, the necking section 113, the second transition section 116, the mixing section 112, the first transition section 115, and the flat interface 111 are all the same. The center lines of the circular interface 114, the third transition section 117, the necking section 113, the second transition section 116, the mixing section 112, the first transition section 115, and the flat interface 111 in the medium flow direction Z may be arranged collinearly.

The second transition section 116 is arranged in a flat shape, and the third transition section 117 is arranged in a circular shape

A specific flat configuration of the mixing section 102 is described below.

As shown in fig. 39 to 43, the mixing section 102 includes a first sidewall 1021, a second sidewall 1022, a third sidewall 1023, and a fourth sidewall 1024, the first sidewall 1021, the third sidewall 1023, the second sidewall 1022, and the fourth sidewall 1024 are sequentially connected end to end, the first sidewall 1021 is opposite to and parallel to the second sidewall 1022, the third sidewall 1023 and the fourth sidewall 1024 are opposite to each other, a mixing section 112 is defined between the first sidewall 1021, the third sidewall 1023, the second sidewall 1022, and the fourth sidewall 1024, and the first sidewall 1021 and the second sidewall 1022 are arranged in a flat plate shape. The third side wall 1023 and the fourth side wall 1024 may be disposed in a flat plate shape, or as shown in fig. 39 to 43, along the direction of the first side wall 1021 facing the second side wall 1022, the third side wall 1023 and the fourth side wall 1024 are disposed in an arc shape, and the fourth side wall 1024 and the third side wall 1023 protrude in a direction away from each other, that is, the third side wall 1023 protrudes in a direction away from the fourth side wall 1024, the fourth side wall 1024 protrudes in a direction away from the third side wall 1023, and the fourth side wall 1024 and the third side wall 1023 all form an arc wall protruding outwards.

As shown in fig. 39 to 43, the first sidewall 1021 is aligned with the second sidewall 1022, and the third sidewall 1023 is aligned with the fourth sidewall 1024, where a distance between the first sidewall 1021 and the second sidewall 1022 is different from a distance between the third sidewall 1023 and the fourth sidewall 1024, so that the mixing portion 102 is arranged in a flat shape.

In correspondence with the flat-shaped mixing portion 102, optionally, the flat-shaped connecting portion 101 of the present embodiment includes a fifth side wall 1011, a sixth side wall, a seventh side wall 1013, and an eighth side wall 1014, the fifth side wall 1011, the seventh side wall 1013, the sixth side wall, and the eighth side wall 1014 are connected end to end in sequence, the fifth side wall 1011 is disposed opposite and parallel to the sixth side wall, the seventh side wall 1013 and the eighth side wall 1014 are disposed opposite to each other, a flat interface 111 is defined between the fifth side wall 1011, the sixth side wall, the seventh side wall 1013, and the eighth side wall 1014, and the fifth side wall 1011 and the sixth side wall are disposed in a planar shape. The fifth side wall 1011 is correspondingly connected to the first side wall 1021, the sixth side wall is correspondingly connected to the second side wall 1022, the seventh side wall 1013 is correspondingly connected to the third side wall 1023, and the eighth side wall 1014 is correspondingly connected to the fourth side wall 1024. The seventh sidewall 1013 and the eighth sidewall 1014 may be provided in the same shape as the third sidewall 1023 and the fourth sidewall 1024.

As shown in fig. 39 to 41, when the first transition portion 105 is provided between the flat connection portion 101 and the mixing portion 102, the first side wall 1021 and the fifth side wall 1011, the second side wall 1022 and the sixth side wall 1022, the third side wall 1023 and the seventh side wall 1013, and the fourth side wall 1024 and the eighth side wall 1014 are connected by the side walls corresponding to the first transition portion 105, respectively.

It should be noted that, the shape of the flat connection portion 101 is generally processed based on the shape of the flat tube 200, and after the shape of the flat tube 200 is determined, the flat connection portion 101 may be processed according to the shape of the flat tube 200, and accordingly, the shape of the mixing portion 102 may be determined based on the shape of the flat connection portion 101.

In practical application, the flat tube 200 is generally in a plate-shaped structure with arc-shaped edges on both sides, and the shape of the flat connecting portion 101 and the shape of the mixing portion 102 in this embodiment are also set to be in a plate-shaped structure with arc-shaped edges on both sides, so that the adapting component can be matched with the flat tube 200, the space between the flat tube 200 occupied by the adapting component and the flat tube 200 is reduced, and when the adapting component is connected to a plurality of flat tubes 200, the problem of component interference is not easy to occur.

According to some embodiments of the present application, the size of the mixing section 112 may optionally satisfy the following relationship 2.58.ltoreq.H (W+T)/(W T). Ltoreq.7.3. Where H is the dimension of the mixing section 112 along the direction from the circular interface 114 to the flat interface 111 (i.e., the medium flow direction Z), W is the dimension of the mixing section 112 along the first direction X, T is the dimension of the mixing section 112 along the second direction Y, both the first direction X and the second direction Y are perpendicular to the medium flow direction Z, and the first direction X is perpendicular to the second direction Y.

The dimension H of the mixing section 112 in the direction of the circular interface 114 to the flat interface 111 can be understood as the flow length of the mixing section 112. The dimension W of the mixing section 112 along the first direction X may be understood as the width of the mixing section 112, that is, the inner dimension of the mixing section 102 along the first direction X, specifically, as shown in fig. 43, the dimension W of the mixing section 112 along the first direction X is the distance between the inner side surface of the third side wall 1023 and the inner side surface of the fourth side wall 1024, and when the third side wall 1023 and the fourth side wall 1024 are disposed in an arc shape along the second direction Y, the dimension W of the mixing section 112 along the first direction X is the farthest distance between the inner side surface of the third side wall 1023 and the inner side surface of the fourth side wall 1024 along the first direction X. The dimension T of the mixing section 112 along the second direction Y may be understood as the thickness of the mixing section 112, that is, the inner dimension of the mixing section 102 along the second direction Y, specifically, as shown in fig. 42 and 43, the dimension T of the mixing section 112 along the second direction Y is the distance between the inner side surface of the first sidewall 1021 and the inner side surface of the second sidewall 1022.

In some embodiments, H (w+t)/(w×t) may have a value of 2.58, 2.6, 2.7, 3, 4, 5, 6, 7, 7.3, etc. In the calculation, H, W and T should be in the same unit, for example, millimeter may be used as the unit.

As shown in fig. 48, the abscissa of fig. 48 is the value of H (w+t)/(w×t), and the ordinate is the percentage of the shunt deviation. The flow dividing deviation is understood as a flow dividing deviation of the medium flow of the plurality of medium flow channels 201 in the same flat tube 200, and the larger the flow dividing deviation of the medium (i.e. refrigerant) flow between the plurality of medium flow channels 201 is, the worse the distribution uniformity of the medium in the plurality of medium flow channels 201 is, and the more adverse the heat exchange effect of the microchannel heat exchanger is. Referring to fig. 48, in this embodiment, the size of the mixing section 112 is set to satisfy the relationship of 2.58+.h (w+t)/(w+t). Ltoreq.7.3, so that the flow split deviation of the medium flow between the plurality of medium flow channels 201 can be controlled within 10%, and the adverse effect of the size of the mixing section 112 on the medium distribution is reduced, thereby ensuring or improving the heat exchange efficiency of the microchannel heat exchanger using the flat tube 200.

According to some embodiments of the present application, the size of the mixing section 112 may optionally be such that: less than or equal to [ (W.times.T)/(W+T) 3.53] ² G is less than or equal to 7.12, wherein G is the preset medium flow into which the switching component needs to flow.

The preset medium flow G may be a refrigerant amount set by the microchannel heat exchanger, and may specifically be a mass flow of the refrigerant. In general, when designing certain specific micro-channel heat exchangers, the amount of refrigerant in the micro-channel heat exchanger is preset, and for such micro-channel heat exchangers, the dimension W of the mixing section 112 along the first direction X and the dimension T of the mixing section 112 along the second direction Y can be reasonably considered according to the preset medium flow G.

The preset medium flow rate G may be in kg/hr (kilograms per hour). [ (W.times.T)/(W+T)] ² The value of/G may be 3.53,3.6, 3.7, 3.8, 3.9, 4, 5, 6, 7 or 7.12.

Optionally, in some embodiments, the dimension W of the mixing section 112 along the first direction X is 1.0 to 1.2 times the dimension of the flat interface 111 along the first direction X, and the dimension T of the mixing section 112 along the second direction Y is 1.0 to 1.5 times the dimension T1 of the flat interface 111 along the second direction Y.

The dimension of the flat interface 111 along the first direction X is the inner dimension of the flat connection section along the first direction X, and the dimension of the flat interface 111 along the first direction X corresponds to the width of the flat interface 111, that is, the distance between the inner side surface of the seventh side wall 1013 and the inner side surface of the eighth side wall 1014 of the flat connection portion 101, and when the seventh side wall 1013 and the eighth side wall 1014 are disposed in an arc shape along the second direction Y, the dimension of the flat interface 111 along the first direction X is the farthest distance along the first direction X between the inner side surface of the seventh side wall 1013 and the inner side surface of the eighth side wall 1014. The dimension T1 of the flat interface 111 along the second direction Y may be understood as the thickness of the flat interface 111, that is, the inner dimension of the flat connection portion 101 along the second direction Y, specifically, as shown in fig. 42, the dimension T1 of the flat interface 111 along the second direction Y is the distance between the inner side surface of the fifth side wall 1011 and the inner side surface of the sixth side wall.

It should be noted that, the flat interface 111 is generally adapted to the flat tube 200, so that a dimension of the flat interface 111 along the first direction X is consistent with a total width of the flat tube 200 along the first direction X, and a dimension T1 of the flat interface 111 along the second direction Y is consistent with a total thickness of the flat tube 200 along the second direction Y.

The abscissa of fig. 49 is [ (W x T)/(w+t)] ² As can be seen from the fact that the coordinates of FIG. 49 are the split deviations, the size of the mixing section 112 is set to 3.53. Ltoreq [ (W.times.T)/(W+T) in this embodiment, as can be seen from the fact that FIG. 49] ² And G is less than or equal to 7.12, so that the flow dividing deviation of the medium flow among the plurality of medium flow channels 201 is controlled within 10%, the adverse effect of the size of the mixing section 112 on medium distribution is reduced, and the heat exchange efficiency of the micro-channel heat exchanger using the flat tube 200 is ensured or improved.

According to some embodiments of the present application, the dimensions of the necked-down segment 113 may optionally satisfy: 1.25.ltoreq.D.times.L/D ² ≤8；Where D is the diameter of the circular port 114, L is the dimension of the necked-down section 113 in the direction from the circular port 114 to the flat port 111 (i.e., the medium flow direction Z), and D is the diameter of the necked-down section 113.

The diameter D of the circular port 114 is the inner diameter of the circular connecting portion 104, and when the circular port 114 is the input end of the medium and the flat port 111 is the output end of the medium, the diameter D of the circular port 114 is the inner diameter of the inlet of the necking portion 103; in the case where the circular port 114 is an output end of the medium and the flat port 111 is an input end of the medium, the diameter D of the circular port 114, that is, the inner diameter of the outlet of the constricted portion 103. The diameter d of the necked-down section 113 is the inner diameter of the necked-down portion 103.

The abscissa of FIG. 50 is D.times.L/D ² The coordinate ratio is a pressure drop ratio, specifically, the pressure drop ratio is understood to be the ratio of the pressure drop of the medium at the two ends of the necking section 113, and fig. 50 shows the ratio of the pressure drop of the medium flowing out of the necking section 113 to the pressure drop of the medium flowing into the necking section 113 when the medium flows into the circular interface 114 and flows into the flat interface 111. When the pressure drop ratio is too small, the acceleration effect of the medium is poor, and when the pressure drop ratio is too large, the flow resistance of the medium is too large. In this embodiment, the size of the necking segment 113 is set to be 1.25 +.D.times.L/D ² Not more than 8, the method can not only meet the requirement that the medium is accelerated to achieve the effect of improving the uniformity of medium distribution, but also can not excessively increase the flow resistance of the medium.

In one embodiment, the size of the mixing section 112 satisfies the relationship of 2.58. Ltoreq.H (W+T)/(W+T). Ltoreq. 7.3,3.53. Ltoreq.W+T] ² G is less than or equal to 7.12; the dimensions of the necked-down section 113 satisfy: 1.25.ltoreq.D.times.L/D ² And is less than or equal to 8. The dimension of the flat interface 111 along the first direction X may be 12 mm to 32 mm, specifically 12 mm, 14 mm, 15 mm, 16 mm, 18 mm, 20 mm, 25 mm, 28 mm, 29 mm, 30 mm, 31 mm or 32 mm; the dimension of the flat interface 111 along the second direction YT1 may be 1.5 mm to 4 mm, and may specifically be 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm or 4 mm; the diameter D of the circular interface 114 may be 4 mm to 10 mm, and in particular, the diameter D of the circular interface 114 may be 5.0 mm, 7 mm, 7.94 mm or 9.52 mm. The thickness of the flat tube 200 suitable for the adapting part can be 1.5 mm to 32 mm, the width of the flat tube 200 can be 12 mm to 32 mm, the wall thickness can be 0.3 mm to 0.4 mm, and the thickness of the rib plates 202 which are isolated in the flat tube 200 and form each medium flow channel 201 can be 0.2 mm to 0.3 mm.

Optionally, the adapting part of this embodiment may be provided with the hole of permeating water, and the hole of permeating water link up the both sides of part body 100, and when the comdenstion water appears in part body 100, the hole of permeating water can in time discharge the comdenstion water, reduces the influence that the comdenstion water produced the heat transfer effect of microchannel heat exchanger. Specifically, the water permeable holes may be disposed on the mixing portion 102 or the second transition portion 106, and the water permeable holes may penetrate through both sides of the component body 100 along the second direction Y.

Optionally, the adapting part of this embodiment may further be provided with a splitter, where a plurality of through holes for medium to flow are provided in a dispersed manner, and the splitter may be provided on the necking section 113, or may be provided on the second transition section 116 between the necking section 113 and the mixing section 112. By providing the splitter, the media can be dispersed, and the flow rate of the media can be further increased, which is beneficial to the mixing of the media in the mixing section 112, thereby improving the uniformity of the media distribution of the plurality of media flow channels 201.

Optionally, the flat connecting portion 101 of the adapting component of this embodiment may further be provided with a limiting portion, where the limiting portion may be disposed on an inner wall of the flat connecting portion 101, and the limiting portion is used for limiting the flat tube 200. The limiting portion may specifically be a protruding structure of the inner wall of the flat connection portion 101.

When the adapter component and the flat tube 200 are assembled, the flat tube 200 is inserted into the flat interface 111 formed by the flat connecting portion 101, the flat tube 200 is limited by abutting the portion of the flat tube 200 inserted into the flat interface 111 through the limiting portion (the limiting portion is located in the flat interface 111) arranged on the inner wall of the flat connecting portion 101, so that the flat tube 200 is initially fixed, and then the flat tube 200 is connected with the flat connecting portion 101 through welding and the like.

Optionally, a limiting portion may also be provided on the circular connecting portion 104 of the adapting component in this embodiment, where the limiting portion may be matched with the flat tube connecting portion of the current collecting assembly 300, so as to implement temporary fixation between the adapting component and the current collecting assembly. Specifically, in the case that the flat tube connection portion is a shunt tube, the circular connection portion 104 may be sleeved on the outer side of the shunt tube, that is, the shunt tube is inserted in the circular interface 114 formed by the circular connection portion 104, and a limiting portion may be disposed on an inner wall of the circular connection portion 104, and the limiting portion may be a protruding structure. Under the condition that the flat pipe connecting portion is a diversion hole, the circular connecting portion 104 can be inserted into the diversion hole, a limiting portion can be arranged on the outer wall of the circular connecting portion 104, and the limiting portion can be of a tiny protruding structure.

The present embodiment also provides a microchannel heat exchanger, which comprises a current collecting assembly 300 and a heat exchanging assembly, wherein the heat exchanging pipe is connected with the current collecting assembly 300. The heat exchange assembly is provided in the present embodiment or any embodiment.

Wherein, optionally, the current collecting assembly 300 has a flat tube connection part; the circular interface 114 of the adapting member is adapted to and connected with the flat tube connection, and the flat interface 111 of the adapting member is adapted to and connected with the flat tube 200.

The collecting assembly 300 may include a collecting pipe 310 and a plurality of shunt pipes 330, where the plurality of shunt pipes 330 are sequentially disposed on a sidewall of the collecting pipe 310 and connected with the collecting pipe 310, and the collecting pipe 310 and the plurality of shunt pipes 330 form a flute pipe, and an inner diameter of the shunt pipes 330 is smaller than an inner diameter of the collecting pipe 310. That is, the adapting member may be applied to a micro channel heat exchanger using a flute-shaped tube as the collecting assembly 300. The circular port 114 of the adapter member can be connected to and communicate with the shunt tube 330 on the flute-shaped tube.

The collecting assembly 300 may also be a solution in which the distributor is matched with a capillary tube, the capillary tube can be used as the shunt tube 330, and the adapting component is connected with the shunt tube 330 of the distributor.

As shown in fig. 46, in one embodiment, the collecting assembly 300 includes a collecting pipe 310 and a distributor, wherein the collecting pipe 310 is provided with a shunt pipe 330, the distributor is provided with a shunt pipe 330, and the shunt pipe 330 on the collecting pipe 310 and the shunt pipe 330 of the distributor are both used for being connected with the flat pipe 200, and accordingly, both form a flat pipe connection part. The number of the shunt tubes 330 on the collecting pipe 310 can be multiple, the number of the shunt tubes 330 on the distributor can be multiple, any shunt tube 330 is connected with a switching component, the switching component is connected with a flat tube 200, a connecting tube 340 between the flat tube 200 and the flat tube 200 can be a round tube, and two ends of the connecting tube 340 are connected with the corresponding flat tube 200 through the switching component. In this embodiment, the medium may flow into the plurality of shunt tubes 330 of the distributor via the distributor, the plurality of shunt tubes 330 of the distributor deliver the medium to the respective flat tubes 200 via the corresponding switching members, and the medium flowing through the flat tubes 200 flows out via the header 310.

As shown in fig. 47, in another implementation, the current collecting assembly 300 includes two current collecting pipes 310, a plurality of flat pipes 200 are disposed between the two current collecting pipes 310, and two ends of any one flat pipe 200 are connected and communicated with the corresponding current collecting pipe 310 through a adapting component.

The embodiment also provides an air conditioner, which comprises the micro-channel heat exchanger.

The micro-channel heat exchanger can be used as an indoor unit of an air conditioner and also can be used as an outdoor unit. The microchannel heat exchanger can be used as an evaporator or a condenser.

The air conditioner of the embodiment also comprises a compressor, an expansion valve, a shell and other conventional components of the air conditioner.

The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A heat exchange assembly, comprising:

a flat tube (200);

the first fin (410) is provided with a first end face (414), a first open groove (413) is formed in the first end face (414), and the first fin (410) is sleeved on one side of the flat tube (200) through the first open groove (413);

The second fin (420) is provided with a second end face (424), a second open groove (423) is formed in the second end face (424), and the second fin (420) is sleeved on the other side of the flat tube (200) through the second open groove (423);

the first end face (414) is arranged opposite to the second end face (424), and the first end face (414) and the second end face (424) are in concave-convex fit;

the heat exchange assembly further comprises a transfer component, the transfer component comprises a component body (100), a channel penetrating through two ends of the component body (100) is formed in the component body (100), a flat interface (111) is formed at one end of the channel, the flat interface (111) is connected with the flat tube (200), a round interface (114) is formed at the other end of the channel, and the round interface (114) is used for being connected with a flat tube connecting part of the current collecting assembly (300);

the passageway still includes throat section (113) and mixed section (112), throat section (113) with mixed section (112) arrange in between circular interface (114) with flat interface (111), and follow circular interface (114) extremely the direction of flat interface (111) sets up in order, the circulation cross-section of throat section (113) is less than simultaneously mixed section (112) the circulation cross-section with circular interface (114) the circulation cross-section, mixed section (112) the circulation cross-section is greater than circular interface (114) the circulation cross-section, just mixed section (112) the circulation cross-section is greater than flat interface (111) the circulation cross-section, mixed section (112) are flat setting, throat section (113) are circular setting.

2. The heat exchange assembly according to claim 1, wherein the flat tube (200) extends in a preset direction (Z), the first fins (410) and the second fins (420) are arranged in a first direction (X), and the first end face (414) and the second end face (424) extend in a second direction (Y), respectively;

the preset direction (Z) is perpendicular to the flow section of the flat pipe (200), and the first direction (X), the second direction (Y) and the preset direction (Z) are intersected in pairs.

3. The heat exchange assembly according to claim 2, wherein the number of flat tubes (200) is plural, the plural flat tubes (200) being arranged at a distance from each other along the second direction (Y);

the first fins (410) are provided with a plurality of first open grooves (413) at intervals along the second direction (Y), the second fins (420) are provided with a plurality of second open grooves (423) at intervals along the second direction (Y), and the first open grooves (413), the second open grooves (423) and the flat tubes (200) are arranged in a one-to-one correspondence.

4. A heat exchange assembly according to claim 3, wherein the first end face (414) is provided with a protruding portion (415) between two adjacent first open grooves (413), the second end face (424) is provided with a recessed portion (425) between two adjacent second open grooves (423), and the protruding portion (415) is provided with the recessed portion (425) in a concave-convex fit.

5. The heat exchange assembly according to claim 4, wherein the projection (415) is gradually approaching on both sides of the second direction (Y) in a direction of the first end face (414) towards the second end face (424) such that the projection (415) is tapered.

6. The heat exchange assembly of claim 5 wherein the projection (415) is arcuately disposed facing the recess (425) and the recess (425) is arcuately disposed facing the recess of the projection (415);

or, the protruding parts (415) are respectively arranged on two sides of the second direction (Y) in inclined planes, and the recessed parts (425) are respectively arranged on two sides of the second direction (Y) in inclined planes.

7. The heat exchange assembly according to any one of claims 1 to 6, wherein the number of the first fins (410) is plural, the plural first fins (410) are arranged at intervals along a preset direction (Z), the number of the second fins (420) is plural, the plural second fins (420) are arranged at intervals along the preset direction (Z), and the first fins (410) are arranged in one-to-one correspondence with the second fins (420);

The preset direction (Z) is perpendicular to the flow cross section of the flat tube (200).

8. The heat exchange assembly of any of claims 1-6 wherein the heat exchange area of the first fin (410) is smaller than the heat exchange area of the second fin (420);

and/or the first fin (410) is different from the second fin (420) in sheet type.

9. The heat exchange assembly of any of claims 1-6, wherein the first fin (410) is a flat-sheet fin (401), a corrugated fin (402), a bridged-sheet fin (403), or a louvered fin (404);

and/or the second fin (420) is a flat fin (401), a corrugated fin (402), a bridge fin (403) or a louver fin (404).

10. The heat exchange assembly according to any one of claims 1-6, wherein the flat tube (200) comprises a first tube portion (21) and a second tube portion (22), the first tube portion (21) and the second tube portion (22) both extend along a preset direction (Z), the first tube portion (21) and the second tube portion (22) are sequentially connected along a first direction (X), the first fin (410) is sleeved on the first tube portion (21) through the first open slot (413), and the second fin (420) is sleeved on the second tube portion (22) through the second open slot (423);

The preset direction (Z) is perpendicular to the flow section of the flat tube (200), and the first direction (X) is intersected with the preset direction (Z).

11. The heat exchange assembly according to claim 10, wherein the first tube portion (21) and the second tube portion (22) are each provided with a medium flow channel (201);

the flow area of the medium flow channel (201) of the first pipe portion (21) is larger than the flow area of the medium flow channel (201) of the second pipe portion (22), and/or the number of the medium flow channels (201) of the first pipe portion (21) is smaller than the number of the medium flow channels (201) of the second pipe portion (22), and/or the shape of the flow cross section of the medium flow channel (201) of the first pipe portion (21) is different from the shape of the flow cross section of the medium flow channel (201) of the second pipe portion (22).

12. The heat exchange assembly according to claim 11, wherein the first tube portion (21) gradually decreases in size in a second direction (Y) from a side closer to the second tube portion (22) to a side farther from the second tube portion (22), the first direction (X), the second direction (Y) and the preset direction (Z) intersecting two by two;

And/or, the second pipe portion (22) gradually decreases in size in a second direction (Y) from a side close to the first pipe portion (21) to a side far from the first pipe portion (21), and the first direction (X), the second direction (Y) and the preset direction (Z) intersect in pairs.

13. The heat exchange assembly according to claim 12, wherein the first tube portion (21) comprises a first wall surface (211) and a second wall surface (212), the first wall surface (211) being arranged opposite to the second wall surface (212) in a second direction (Y), the first wall surface (211) being arranged gradually closer to the second wall surface (212) from a side closer to the second tube portion (22) to a side farther from the second tube portion (22), the first wall surface (211) being curved or inclined and/or the second wall surface (212) being curved or inclined along the first direction (X);

and/or, the second pipe portion (22) includes a third wall surface (221) and a fourth wall surface (222), the third wall surface (221) and the fourth wall surface (222) are disposed opposite to each other in the second direction (Y), from a side close to the first pipe portion (21) to a side far away from the first pipe portion (21), the third wall surface (221) and the fourth wall surface (222) are disposed gradually close to each other, and along the first direction (X), the third wall surface (221) is an arc surface or an inclined surface and/or the fourth wall surface (222) is an arc surface or an inclined surface.

14. The heat exchange assembly according to claim 11, wherein a first rib plate (213) is disposed in the first tube portion (21), the medium flow channels (201) are formed on two sides of the first rib plate (213), the first rib plate (213) is bent along the second direction (Y), and the first tube portion (21) is connected with the first fin (410) in an expansion joint manner;

second gusset (223) are arranged in the second pipe portion (22), medium flow channels (201) are respectively formed on two sides of the second gusset (223), the second gusset (223) is arranged in a straight line along the second direction (Y), and the second pipe portion (22) is welded or bonded with the second fins (420).

15. Heat exchange assembly according to claim 10, wherein a connection (23) is provided between the first tube portion (21) and the second tube portion (22);

the connecting part (23) is provided with a drain hole (231), and/or the connecting part (23) is provided with a bulge (232).

16. The heat exchange assembly according to any one of claims 1 to 6, wherein a surface of the flat tube (200), a surface of the first fin (410) and/or a surface of the second fin (420) is provided with a hydrophilic layer.

17. A microchannel heat exchanger comprising:

a current collecting assembly (300);

the heat exchange assembly of any of claims 1-16, the flat tube (200) being connected to the header assembly (300).

18. An air conditioner comprising the microchannel heat exchanger of claim 17.