CN218379986U - Micro-channel heat exchanger - Google Patents

Abstract

The disclosure relates to a micro-channel heat exchanger, which comprises a collecting pipe, a plurality of flat pipes, fins and a refrigerant distribution device. The collecting pipes comprise a first collecting pipe and a second collecting pipe which are arranged in parallel. One end of each flat pipe is connected with the first collecting pipe, the other end of each flat pipe is connected with the second collecting pipe, and the flat pipes are communicated with the first collecting pipe and the second collecting pipe. The fin is arranged between two adjacent flat pipes. The refrigerant distribution device is arranged on the collecting pipe. The refrigerant distribution device comprises a distribution pipe and a plurality of input pipes, wherein: the distribution pipe is provided with a plurality of distribution holes in an axial direction in an arrayed manner, the distribution holes penetrate through the distribution pipe, and the plurality of distribution holes are communicated with the collecting pipe and the distribution pipe; the plurality of input pipes are communicated with the distribution pipe, and the plurality of input pipes are arranged in an axial direction of the distribution pipe and used for conveying the refrigerant to different positions of the distribution pipe. Therefore, the distribution of the refrigerant can be optimized, and the heat exchange effect of the micro-channel heat exchanger is improved.

Description

Micro-channel heat exchanger

Technical Field

The present disclosure relates to the field of heat exchangers, and more particularly, to a microchannel heat exchanger.

Background

The microchannel heat exchanger generally comprises a collecting pipe, flat pipes formed with microchannels and fins arranged between the adjacent flat pipes. The micro-channel heat exchanger has high heat exchange coefficient, good corrosion resistance and wide application.

In the prior art, a microchannel heat exchanger distributes refrigerant through a distribution pipe in a collecting pipe. In the process that the refrigerant flows from one end of the distribution pipe to the other end of the distribution pipe, the flow is smaller and smaller, and along with the gas-liquid separation phenomenon, the refrigerant entering the flat pipe is unevenly distributed, and the heat exchange capacity of the micro-channel heat exchanger is affected.

SUMMERY OF THE UTILITY MODEL

The micro-channel heat exchanger can optimize the distribution of refrigerants and improve the heat exchange effect of the micro-channel heat exchanger.

The embodiment of the disclosure provides a micro-channel heat exchanger, which comprises a collecting pipe, a plurality of flat pipes, fins and a refrigerant distribution device; the collecting pipes comprise a first collecting pipe and a second collecting pipe which are arranged in parallel; one ends of the flat pipes are connected with the first collecting pipe, the other ends of the flat pipes are connected with the second collecting pipe, and the flat pipes are communicated with the first collecting pipe and the second collecting pipe; the fins are arranged between two adjacent flat tubes; the refrigerant distribution device is arranged on the collecting pipe; the refrigerant distribution device comprises a distribution pipe and a plurality of input pipes; wherein: the distribution pipes are provided with a plurality of distribution holes in an axial direction in an arrayed manner; the distribution holes are arranged through the distribution pipe; the plurality of distribution holes are communicated with the collecting pipe and the distribution pipe; the plurality of input pipes are communicated with the distribution pipe, and the plurality of input pipes are arranged in an axial direction of the distribution pipe and used for conveying the refrigerant to different positions of the distribution pipe.

In one embodiment, the dispensing tube is provided with a first chamber, the inlet tube communicating with the first chamber; the pressure manifold is provided with a second chamber, the distribution pipe is arranged in the second chamber, and the first chamber is communicated with the second chamber through the distribution hole.

In one embodiment, the collecting pipe is provided with a plurality of openings, the number of the openings is equal to that of the input pipes, and the input pipes penetrate through the openings and extend out of the collecting pipe; the collecting pipe is of a split structure along the axial direction and is provided with a first split body and a second split body, the first split body is provided with a first hole, the second split body is provided with a second hole, and the first hole and the second hole are communicated in a one-to-one correspondence mode to form an opening.

In one embodiment, the refrigerant distribution device further comprises an orifice throttling device arranged in the input pipe.

In one embodiment, multiple orifice restrictions may be provided in a single inlet conduit.

In one embodiment, the orifice plate restrictions in the plurality of inlet pipes have different bore diameters.

In one embodiment, the number of distribution holes and/or input pipes in the high air volume area close to the microchannel heat exchanger is more than that in the low air volume area; and/or the presence of a gas in the gas,

the diameter of the distribution hole and/or the input pipe close to the high air volume area of the micro-channel heat exchanger is larger than that of the distribution hole and/or the input pipe close to the low air volume area of the micro-channel heat exchanger.

In one embodiment, the input tube is perpendicular to the distribution tube; and/or the plurality of input pipes are parallel to each other and are positioned in the same plane.

In one embodiment, the plurality of dispensing apertures are linearly arranged along the axial direction of the dispensing tube.

In one embodiment, the microchannel heat exchanger further comprises a distributor, the plurality of input pipes are hoses, and the plurality of input pipes are connected with the distributor.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

by arranging the refrigerant distribution device, the refrigerant enters the distribution pipe through the plurality of input pipes, so that the amount of the refrigerant and the proportion of the liquid refrigerant in each position in the distribution pipe are more uniform, and the amount of the refrigerant and the proportion of the liquid refrigerant in each position in the collecting pipe are more uniform. The uniform refrigerant enters the flat tubes again for heat exchange, and the heat exchange efficiency of the micro-channel heat exchanger is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

Brief description of the drawingsthe accompanying drawings, which form a part of the disclosure, are included to provide a further understanding of the disclosure, and the exemplary embodiments and descriptions thereof are provided to explain the disclosure and not to limit the disclosure.

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a microchannel heat exchanger in one embodiment.

FIG. 2 is an enlarged partial schematic view of the microchannel heat exchanger shown in FIG. 1.

FIG. 3 is an enlarged partial schematic view of the microchannel heat exchanger shown in FIG. 1.

Fig. 4 is a schematic structural view of the refrigerant distribution device shown in fig. 1.

Fig. 5 is a schematic structural view of a refrigerant distribution device in another embodiment.

Fig. 6 is a schematic structural diagram of a header in an embodiment.

Reference numerals are as follows:

10-a microchannel heat exchanger; 100-collecting main; 110-first header; 120-a second header; 130-a plurality of flat tubes; 140-a fin; 150-refrigerant distribution means; 151-distribution pipes; 152-a plurality of input tubes; 1511-dispensing hole; 1512-a first chamber; 101-a second chamber; 1513-plug connector; 153-orifice plate throttling means; 102-opening a hole; 103-a first split; 104-a second body; 1031-first hole; 1041-second well.

Detailed Description

For the purpose of making the purpose, technical solutions and advantages of the present disclosure more apparent, the present disclosure will be described in further detail below with reference to the accompanying drawings and detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the disclosure, are intended for purposes of illustration only and are not intended to limit the scope of the disclosure.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein in the description of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.

The heat exchange or cold exchange effect in the micro-channel heat exchanger mainly depends on the heat exchange effect of the flat tubes and the fins, and the heat or cold of the fins comes from the flat tubes. The heat exchange of the flat tubes depends on the distribution of the refrigerant to the microchannels in the flat tubes, which are mainly used for the circulation of the refrigerant. Therefore, the quantity of the refrigerant distributed to the micro-channels in the flat tubes, the proportion of the distributed refrigerant containing liquid refrigerant and the like are direct influence factors of the heat exchange effect of the micro-channel heat exchanger.

Based on this, this disclosure provides a microchannel heat exchanger, can optimize the distribution of refrigerant, improves microchannel heat exchanger's heat transfer effect.

The microchannel heat exchanger of the present disclosure is described in detail below with reference to the accompanying drawings. The features of the following examples and embodiments may be combined with each other without conflict.

In one embodiment of the present disclosure, referring to fig. 1 to 4, a microchannel heat exchanger 10 is provided, which includes a header 100, a plurality of flat tubes 130, fins 140, and a refrigerant distribution device 150. The header 100 includes a first header 110 and a second header 120 arranged in parallel. One end of each flat pipe 130 is connected with the first collecting pipe 110, the other end of each flat pipe 130 is connected with the second collecting pipe 120, and the flat pipes 130 are communicated with the first collecting pipe 110 and the second collecting pipe 120. The fins 140 are disposed between two adjacent flat tubes 130. The refrigerant distribution device 150 is provided in the header 100. The refrigerant distribution device 150 includes a distribution pipe 151 and a plurality of input pipes 152. Wherein: the distributing pipe 151 is provided with a plurality of distributing holes 1511 in an axial direction, the distributing holes 1511 penetrate through the distributing pipe 151, and the distributing holes 1511 are communicated with the collecting main 100 and the distributing pipe 151. A plurality of input pipes 152 are provided in communication with the distribution pipe 151, and the plurality of input pipes 152 are arranged in an axial direction of the distribution pipe 151 for delivering the refrigerant to different positions of the distribution pipe 151.

By providing the refrigerant distribution device 150, the refrigerant enters the distribution pipe 151 via the plurality of input pipes 152, and since the plurality of input pipes 152 are provided at intervals in the axial direction of the distribution pipe 151, the refrigerant can flow to various positions of the distribution pipe 151 through the plurality of input pipes 152. The arrangement of the plurality of input pipes 152 makes the amount of refrigerant and the ratio of liquid refrigerant at each location in the distribution pipe 151 more uniform than when only one refrigerant inlet is provided in the distribution pipe. Next, the refrigerant in the distribution pipe 151 enters the header pipe 100 through the distribution holes 1511 arranged at intervals in the axial direction of the distribution pipe 151, and the amount of the refrigerant and the liquid refrigerant ratio at each position in the header pipe 100 are more uniform. The uniform refrigerant enters the flat tube 130 again for heat exchange, and the heat exchange efficiency of the micro-channel heat exchanger 10 is improved.

In some embodiments, the flat tubes 130 disposed between the first header 110 and the second header 120 are disposed substantially parallel to each other, and the heat-exchanging fins 140 are fixed between two adjacent flat tubes 130. The first collecting pipe 110 and the second collecting pipe 120 are respectively provided with a plurality of interfaces for connecting with the flat pipe 130 on the pipe wall corresponding to the insertion of the flat pipe 130, and two ends of the flat pipe 130 can be respectively inserted into the first collecting pipe 110 and the second collecting pipe 120 through the interfaces. The flat pipe 130 is inserted into the first header 110 and the second header 120 and then sealed and fixed by brazing. End caps may be further disposed at two ends of the first header 110 and the second header 120 for plugging the headers, and the end caps may be formed by stamping a flat plate. Since the end faces of the tubes for the flat tubes 130 all extend into the header 100, the refrigerant for conducting heat or cold needs to be distributed from the inner cavity of the header 100 to the flat tubes 130 above. The refrigerant distribution device 150 provided by the present disclosure distributes the refrigerant flowing into the inner cavity of the collecting main 100 uniformly, so that the state of the refrigerant in each flat tube 130 in the flat tube fin set for heat exchange is reasonable, uniform and stable, and the proportion of the liquid refrigerant in the refrigerant entering the micro-channels of each flat tube 130 is relatively reasonable, thereby improving the heat exchange effect between each group of flat tubes 130 and the fins 140 in the heat exchange flat tube fin set, and thus improving the overall efficiency of the micro-channel heat exchanger 10.

In some embodiments, referring to FIG. 3, the dispensing tube 151 is provided with a first chamber 1512, and the input tube 152 is in communication with the first chamber 1512. The collecting main 100 is provided with a second chamber 101, the distributing pipe 151 is arranged in the second chamber 101, and the first chamber 1512 and the second chamber 101 are communicated through the distributing holes 1511. In this manner, the refrigerant enters the first chamber 1512 through the plurality of inlet tubes 152 in communication with the first chamber 1512 and impinges upon each other within the first chamber 1512 to effect a first mixing, resulting in uniform distribution of the gaseous refrigerant and the liquid refrigerant. Next, the refrigerant in the first chamber 1512 enters the second chamber 101 through the distribution holes 1511 communicating the first chamber 1512 and the second chamber 101, and the refrigerant passing through the distribution holes 1511 is injected in a contracted state due to the contraction effect, so that the refrigerants entering the second chamber 101 again collide with each other to be mixed for the second time, and the refrigerant in each part in the second chamber 101 is more uniform. Finally, the uniformly mixed refrigerant enters the flat tube 130, and the heat exchange effect of the microchannel heat exchanger 10 is greatly improved.

Specifically, in some embodiments, the first header 110 of the microchannel heat exchanger 10 is an inlet header to which the refrigerant distribution device 150 is attached. The refrigerant is distributed by the refrigerant distribution device 150 before entering the flat tube 130, so that a good uniform distribution effect can be generated. The first header 110 has a second chamber 101, the distribution tube 151 is disposed in the second chamber 101, and the first chamber 1512 and the second chamber 101 are connected by a distribution hole 1511. Thus, before entering the flat tubes 130, the refrigerant enters each part of the first cavity 1512 of the distribution tube 151 relatively uniformly through the plurality of input tubes 152, and then is subjected to the above-mentioned secondary mixing, and then enters the flat tubes 130, so that the refrigerant in each group of flat tubes 130 is relatively uniform, the waste of the refrigerant is reduced, and the heat exchange efficiency of the microchannel heat exchanger 10 is improved.

When many flat pipes 130 used at microchannel heat exchanger 10, the position of locating was different in the wind field, and some flat pipes 130 are close to high amount of wind region, and some then are close to low amount of wind region. The heat exchange effect of the refrigerant in the flat tube 130 relatively close to the high air volume area is better than that of the refrigerant close to the low air volume area, and if the flat tube 130 close to the high air volume area is distributed to more uniform and more refrigerants, the heat exchange efficiency can be improved. Thus, in some embodiments, the distribution holes 1511 and/or input ducts 152 are more numerous near the high air volume regions than near the low air volume regions of the microchannel heat exchanger 10. That is, the distance between two adjacent distribution holes 1511 is not equal, and/or the distance between two adjacent inlet pipes 152 is not equal. The distance between two adjacent distribution holes 1511 and/or two adjacent input pipes 152 is designed reasonably according to the heat exchange condition of each flat pipe 130 in the microchannel heat exchanger 10. More distribution holes 1511 and/or input pipes 152 are arranged in the area close to the high air volume, and the distance between the distribution holes 1511 and/or the input pipes 152 is shorter, so that more and more uniform refrigerants can flow into the header of the high air volume area and then enter the flat pipe 130, the heat exchange efficiency of the flat pipe 130 and the fin 140 group close to the high air volume area is improved, and the heat exchange effect of the micro-channel heat exchanger 10 is improved.

Further, when the distribution holes 1511 and/or the input pipes 152 are arranged in different areas of the microchannel heat exchanger 10 in different numbers, the size of each distribution hole 1511 and/or the diameter of each input pipe 152 can be set to be the same, so that the processing is relatively convenient.

In other embodiments, the diameter of the distribution holes 1511 and/or the input pipes 152 near the high air volume area of the microchannel heat exchanger 10 is larger than that near the low air volume area, so that the heat exchange effect of the flat pipes 130 and the fins 140 near the high air volume area can be improved.

It can be understood that, in still other embodiments, the heat exchange effect at each position of the microchannel heat exchanger 10 is not very different, the distance between two adjacent distribution holes and/or the distance between two adjacent input pipes may be set to be equal, and the diameters of each distribution hole and/or each input pipe may be set to be the same, so that the calculation amount of the design engineering can be reduced, and the processing difficulty can also be reduced.

In some embodiments, as shown in fig. 5, refrigerant distribution device 150 further includes orifice restriction 153 disposed within inlet pipe 152. The orifice plate throttling device 153 is used for achieving a throttling function, pressure drop is adjusted, the flow of the refrigerant in each input pipe 152 is regulated, the refrigerant is distributed more uniformly, and cost can be reduced by using the orifice plate throttling device 153.

Specifically, an orifice throttling device 153 may be disposed in each input pipe 152, or an orifice throttling device 153 may be disposed in a part of the input pipes 152 according to actual throttling requirements.

Further, the refrigerant distribution device 150 may further include a thermal expansion valve or an electronic expansion valve, which is disposed at an inlet of the input pipe 152 to replace the orifice plate throttling device 153 or be used in combination with the orifice plate throttling device 153 to achieve a refrigerant flow rate adjusting function.

In some embodiments, multiple orifice restrictions 153 may be disposed within one input pipe 152. Thereby better regulating and controlling the flow rate of the refrigerant in the input pipe 152 and reducing the occurrence of cavitation.

In some embodiments, orifice plate restrictions 153 within multiple input tubes 152 differ in orifice diameter. The aperture of the orifice plate throttling device 153 in each input pipe 152 is designed according to the required refrigerant flow at the position of the input pipe 152, so that the utilization rate of the refrigerant is improved, and the heat exchange capacity of the micro-channel heat exchanger 10 is optimized.

In some embodiments, the microchannel heat exchanger 10 further comprises a distributor, the plurality of input pipes 152 are hoses, and the plurality of input pipes 152 are connected to the distributor. In this way, the refrigerant in the input pipes 152 all come from the same source distributor, and the lengths of the hoses are also approximately the same, so that the uniformity of the refrigerant in the input pipes 152 is ensured.

In some embodiments, as shown in fig. 6, the manifold 100 is provided with a plurality of openings 102, the number of openings 102 being equal to the number of inlet tubes 152, the inlet tubes 152 extending through the openings 102 and out of the manifold 100. The collecting pipe 100 is of a split structure along the axial direction, and is provided with a first split body 103 and a second split body 104, the first split body 103 is provided with a first hole 1031, the second split body 104 is provided with a second hole 1041, and the first hole 1031 and the second hole 1041 are communicated with each other in a one-to-one correspondence manner to form an opening 102. Thus, during manufacturing and assembling, the distribution pipes 151 are placed in the first sub-body 103, the input pipes 152 are inserted into the first holes 1031 one by one, and then the second sub-body 104 and the first sub-body 103 are assembled correspondingly, so that the first holes 1031 and the second holes 1041 are correspondingly communicated to form the open holes 102, and the input pipes 152 are arranged in the open holes 102 to fix the input pipes 152.

Specifically, in some embodiments, the dispensing tube 151 is further provided with a plug 1513 (shown with reference to fig. 4) to facilitate assembly between the input tube 152 and the dispensing tube 151. The input pipe 152 is inserted into the distribution pipe 151 and then welded into a whole, the integrated pipe is then inserted into the first body 103, the first body 103 and the second body 104 are assembled, the first body 103 and the second body 104 are welded and connected, and the input pipe 152 and the opening 102 are also sealed by welding. In other embodiments, the inlet pipe 152, the distribution pipe 151, and the manifold 100 may be integrally formed to ensure sealing performance. The present disclosure does not limit the method of manufacturing the refrigerant distribution device 150.

In some embodiments, referring to fig. 4, the input pipe 152 is perpendicular to the distribution pipe 151, so that the connection assembly between the input pipe 152 and the distribution pipe 151 is facilitated, the production and the manufacture are facilitated, and the input pipe 152 extends outward in a direction perpendicular to the distribution pipe 151, and the space around the input pipe 152 is secured, so that the input pipe 152 can be connected to other pipelines.

In some embodiments, with continued reference to FIG. 4, the plurality of inlet tubes 152 are parallel to each other and lie in the same plane. In this manner, the input pipe 152 and the external pipe are easily connected, and the external pipe is easily integrated to one place.

In some embodiments, with continued reference to fig. 4, the plurality of dispensing apertures 1511 are linearly aligned along the axial direction of the dispensing tube 151. Therefore, the distribution holes 1511 can be conveniently machined in the distribution pipe 151, machining procedures are reduced, and cost is reduced. Of course, the plurality of distribution holes may be arranged to be offset in the axial direction of the distribution pipe 151, and are not limited to the linear arrangement.

In the above-described embodiment, the cross-sections of the collecting main 100, the input pipe 152 and the distribution pipe 151 are all circular, and in practice, the cross-sections of the collecting main 100, the input pipe 152 and the distribution pipe 151 may also be elliptical, substantially square, circular, polygonal and any figure, or a combination of two or more of circular, elliptical, circular, substantially square, polygonal and any figure. The dispensing hole 1511 is circular in the drawing, and may be oval, square, elongated, polygonal, or any other shape, and the plurality of dispensing holes 1511 may be provided in various shapes.

In the description of the present disclosure, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present disclosure and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present disclosure.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include at least one of the feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.

In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In the present disclosure, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "fixed," "disposed," "secured" or "disposed" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one component is considered to be "fixedly connected" to another component, the two components may be fixed by way of detachable connection, or may be fixed by way of non-detachable connection, such as socket connection, clamping connection, integrally formed fixing, welding, etc., which can be realized in the conventional technology, and is not cumbersome.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show several embodiments of the present disclosure, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the inventive concept of the present disclosure, and these are all within the scope of the present disclosure.

Claims (10)

1. A microchannel heat exchanger, comprising:

the collecting pipes comprise a first collecting pipe and a second collecting pipe which are arranged in parallel;

the flat pipes are communicated with the first collecting pipe and the second collecting pipe; one end of each flat pipe is connected with the first collecting pipe, and the other end of each flat pipe is connected with the second collecting pipe;

the fins are arranged between two adjacent flat pipes; and

the refrigerant distribution device is arranged on the collecting pipe; the refrigerant distribution device comprises a distribution pipe and a plurality of input pipes; wherein: the distribution pipes are provided with a plurality of distribution holes in an axial direction in an arrayed manner; the distribution holes penetrate through the distribution pipe; the plurality of distribution holes are communicated with the collecting pipe and the distribution pipe; the input pipes are communicated with the distribution pipe, and the input pipes are arranged in the axial direction of the distribution pipe and used for conveying the refrigerant to different positions of the distribution pipe.

2. The microchannel heat exchanger of claim 1, wherein the distribution tube is provided with a first chamber, the input tube being in communication with the first chamber; the collecting pipe is provided with a second cavity, the distribution pipe is arranged in the second cavity, and the first cavity is communicated with the second cavity through the distribution hole.

3. The microchannel heat exchanger of claim 2, wherein the manifold has a plurality of openings, the number of openings being equal to the number of inlet tubes, the inlet tubes extending through the openings and out of the manifold; the collecting pipe is of a split structure along the axial direction and is provided with a first split body and a second split body, the first split body is provided with a first hole, the second split body is provided with a second hole, and the first hole and the second hole are communicated in a one-to-one correspondence mode to form the opening.

4. The microchannel heat exchanger of claim 1, wherein the refrigerant distribution device further comprises an orifice restriction device disposed within the inlet tube.

5. The microchannel heat exchanger of claim 4, wherein a plurality of orifice plate restrictions are provided in a single inlet tube.

6. The microchannel heat exchanger of claim 4, wherein the orifice plate restrictions in a plurality of the inlet tubes differ in pore size.

7. The microchannel heat exchanger of claim 1, wherein the distribution apertures and/or the inlet ducts are greater in number proximate to high air volume regions than proximate to low air volume regions of the microchannel heat exchanger; and/or the presence of a gas in the gas,

the diameter of the distribution hole and/or the input pipe in a high air volume area close to the micro-channel heat exchanger is larger than that in a low air volume area.

8. The microchannel heat exchanger of claim 1, wherein the inlet tube is perpendicular to the distribution tube; and/or

The input pipes are parallel to each other and located in the same plane.

9. The microchannel heat exchanger of claim 1, wherein the plurality of distribution apertures are linearly arranged along an axial direction of the distribution tube.

10. The microchannel heat exchanger of claim 8, further comprising a distributor, wherein a plurality of the input tubes are flexible tubes, and wherein a plurality of the input tubes are connected to the distributor.

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