CN112413930A - Micro-channel heat exchanger and air conditioning equipment with same - Google Patents

Abstract

The invention provides a micro-channel heat exchanger and air conditioning equipment with the same, wherein the micro-channel heat exchanger comprises a collecting pipe, the collecting pipe comprises a cavity unit with a communicating cavity and a group of first branch pipes communicated with the communicating cavity, the collecting pipe is vertically arranged, and the cavity unit comprises: the injection partition plate is arranged in the communicating cavity, the refrigerant injection port is positioned above the injection partition plate, and the group of first branch pipes are communicated with a cavity of the communicating cavity, which is positioned below the injection partition plate; the injection partition plate is provided with a plurality of injection holes arranged at intervals, so that the refrigerant reaching the upper part of the injection partition plate from the refrigerant injection hole is injected downwards through the injection holes. The micro-channel heat exchanger solves the problem that the micro-channel heat exchanger in the air conditioner with the air outlet fan in the prior art is uneven in flow distribution.

Description

Micro-channel heat exchanger and air conditioning equipment with same

Technical Field

The invention relates to the field of heat exchangers, in particular to a micro-channel heat exchanger and air conditioning equipment with the same.

Background

In the prior art, the micro-channel heat exchanger has higher heat exchange efficiency than a fin copper tube heat exchanger, and has the advantages of high efficiency, compactness, less required refrigerant, light weight and low cost. The air conditioner is firstly applied to an automobile air conditioner, is gradually developed and matured later and is applied to products such as a single-cooling type light commercial air conditioner, a household air conditioner, a water heater and the like, but has the problem of uneven distribution in the aspect of distribution when the air conditioner is applied to a heat pump air conditioner.

The uneven distribution comprises uneven distribution in the upper and lower directions and uneven distribution in the left and right directions, each flat tube of the micro-channel heat exchanger is provided with a plurality of holes which are transversely distributed, and a refrigerant entering the collecting tube cannot uniformly enter the flat tubes through the holes, so that uneven distribution in the left and right directions exists; the collecting pipe of the existing micro-channel heat exchanger is generally vertically placed, when the micro-channel heat exchanger is installed in an air conditioner outdoor unit and used as an evaporator in the heating cycle process, because the refrigerant in a gas-liquid two-phase state is influenced by gravity, gas-liquid layering can occur to a certain degree, the gas refrigerant is easy to gather to the upper space of the collecting pipe, the liquid refrigerant is easy to pile to the lower space of the collecting pipe, the refrigerant quantity entering each flat pipe from the inside of the collecting pipe is uneven, the refrigerant flow entering each flat pipe from top to bottom is different, and the heat exchange effect is seriously influenced.

In the upper fan-out type air conditioner, the difference between the upper and lower wind speeds is large, the wind speed of the upper flow path is large, the wind speed of the lower flow path is small, and the sensitivity to the difference in wind speed is also large due to the uneven distribution of the microchannel heat exchanger. The air speed of the flow path above the collecting pipe is high, the more refrigerant quantity can be processed by the structure above the collecting pipe in the micro-channel heat exchanger, the less flat pipes are needed, but the refrigerant quantity above the collecting pipe is less due to uneven distribution of the micro-channel heat exchanger, and the function of the micro-channel heat exchanger cannot be well played.

In addition, compared with the fin copper tube heat exchanger in the prior art, the micro-channel heat exchanger has a smaller inner volume, and when the outdoor unit of the air conditioner adopts the micro-channel heat exchanger and the indoor unit adopts the fin copper tube heat exchanger, the air conditioner has the problem that the optimal refrigerant quantity in the heating cycle process is larger than the optimal refrigerant quantity in the refrigeration cycle process.

Disclosure of Invention

The invention mainly aims to provide a micro-channel heat exchanger and air conditioning equipment with the same, and aims to solve the problem that the micro-channel heat exchanger in an air conditioner with an air outlet fan in the prior art is uneven in flow distribution.

In order to achieve the above object, according to one aspect of the present invention, there is provided a microchannel heat exchanger, including a header, the header including a cavity unit having a communicating chamber and a set of first branch pipes communicating with the communicating chamber, the header being vertically disposed, the cavity unit including: the injection partition plate is arranged in the communicating cavity, the refrigerant injection port is positioned above the injection partition plate, and the group of first branch pipes are communicated with a cavity of the communicating cavity, which is positioned below the injection partition plate; the injection partition plate is provided with a plurality of injection holes arranged at intervals, so that the refrigerant reaching the upper part of the injection partition plate from the refrigerant injection hole is injected downwards through the injection holes.

Furthermore, the cavity units are multiple and are sequentially arranged from top to bottom.

Further, along the direction from top to bottom, the number of the first shunt pipes corresponding to the plurality of cavity units increases in sequence.

Furthermore, the number of the injection holes on the injection partition plates corresponding to the plurality of cavity units is increased in sequence along the direction from top to bottom; and/or the sizes of the spray holes on the spray partition plates are the same, and the areas of the spray holes on the spray partition plates corresponding to the plurality of cavity units are sequentially increased along the direction from top to bottom.

Furthermore, the microchannel heat exchanger also comprises a plurality of drainage tubes, and the drainage tubes and the cavity units are arranged in one-to-one correspondence; the two ends of each drainage tube are communicated with the cavity below the injection partition plate in the corresponding cavity unit, and the pipe openings of the first shunt tubes of each group, which are communicated with the communication cavity, are located between the two ends of the corresponding drainage tubes.

Furthermore, the microchannel heat exchanger also comprises a liquid distributor, and the liquid distributor is respectively communicated with the refrigerant injection ports of the cavity units so as to respectively provide the refrigerant into the cavity units.

Furthermore, the microchannel heat exchanger also comprises a plurality of second shunt pipes, the second shunt pipes are arranged in one-to-one correspondence with the refrigerant jet ports, and each second shunt pipe is positioned between the liquid separator and the corresponding refrigerant jet port so as to communicate the liquid separator with each refrigerant jet port respectively.

Furthermore, the second shunt tube comprises a shunt capillary tube and a shunt connecting tube which are connected with each other, the shunt capillary tube is connected with the liquid distributor, and the shunt connecting tube is connected with the corresponding refrigerant jet orifice.

Further, the microchannel heat exchanger further comprises: the isolating components are arranged in the collecting pipe at intervals along the vertical direction so as to divide the collecting pipe into a plurality of cavity units which are sequentially arranged from top to bottom.

Further, each isolation component is movably arranged relative to the position of the collecting pipe, so that the number of the first collecting pipes corresponding to the corresponding cavity units can be adjusted by adjusting the positions of the isolation components.

According to another aspect of the invention, an air conditioning device is provided, which comprises an indoor air conditioning unit and an outdoor air conditioning unit, wherein a heat exchanger is arranged in the outdoor air conditioning unit, and the heat exchanger is the micro-channel heat exchanger.

By applying the technical scheme, the microchannel heat exchanger comprises a vertically-arranged collecting pipe, the collecting pipe comprises a cavity unit with a communicating cavity and a group of first distributing pipes communicated with the communicating cavity, the cavity unit comprises a spraying partition plate and a refrigerant jet orifice, the spraying partition plate is arranged in the communicating cavity and divides the communicating cavity into a first cavity part and a second cavity part from top to bottom, the refrigerant jet orifice is positioned in the first cavity part above the spraying partition plate, the group of first distributing pipes are communicated with the second cavity part below the spraying partition plate of the communicating cavity, and the spraying partition plate is provided with a plurality of jet holes arranged at intervals, so that refrigerant reaching the first cavity part above the spraying partition plate from the refrigerant jet orifice is sprayed from top to bottom through the jet holes. Like this, the setting up of injection baffle makes the refrigerant in the cavity unit of pressure manifold evenly spray along the vertical direction of perpendicular to, it is more even to make the refrigerant control reposition of redundant personnel to make the refrigerant can evenly get into in the first pressure manifold through the hole of a plurality of transverse distribution with the pipe orifice department of the first pressure manifold of intercommunication chamber intercommunication, in addition, can also increase the refrigerant volume that gets into first pressure manifold department in the same time quantum, thereby solve among the prior art air conditioner of air-out fan type the microchannel heat exchanger have the inhomogeneous problem of reposition of redundant personnel.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic overall construction of an embodiment of a microchannel heat exchanger according to the invention;

FIG. 2 shows a schematic view of a portion of the microchannel heat exchanger shown in FIG. 1; and

fig. 3 shows a schematic diagram of the structure of the injection separator in the microchannel heat exchanger shown in fig. 1.

Wherein the figures include the following reference numerals:

1. a header pipe; 10. a cavity unit; 11. a first cavity portion; 12. a second chamber portion; 13. a refrigerant injection port; 2. an isolation member; 3. a first shunt pipe; 4. a jet spacer; 41. a plate body portion; 42. an injection hole; 5. a second shunt pipe; 51. a shunt connecting pipe; 52. a shunt capillary; 6. a liquid separator; 7. a drainage tube; 71. a first end; 72. a second end.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 3, the present invention provides a microchannel heat exchanger, including a header 1, where the header 1 includes a cavity unit 10 having a communicating cavity and a group of first branch pipes 3 communicated with the communicating cavity, the header 1 is vertically disposed, and the cavity unit 10 includes: the injection partition plate 4 is arranged in the communicating cavity, the refrigerant injection port 13 is positioned above the injection partition plate 4, and the group of first shunt tubes 3 are communicated with the cavity of the communicating cavity, which is positioned below the injection partition plate 4; the injection partition plate 4 is provided with a plurality of injection holes 42 arranged at intervals so that the refrigerant reaching the upper side of the injection partition plate 4 from the refrigerant injection port 13 is injected downward through the injection holes 42.

The microchannel heat exchanger comprises a vertically-arranged collecting pipe 1, wherein the collecting pipe 1 comprises a cavity unit 10 with a communicating cavity and a group of first shunt pipes 3 communicated with the communicating cavity, the cavity unit 10 comprises an injection partition plate 4 and a refrigerant injection port 13, the injection partition plate 4 is arranged in the communicating cavity and divides the communicating cavity into a first cavity part 11 and a second cavity part 12 from top to bottom, the refrigerant injection port 13 is positioned in the first cavity part 11 above the injection partition plate 4, the group of first shunt pipes 3 are communicated with the second cavity part 12 of the communicating cavity below the injection partition plate 4, and the injection partition plate 4 is provided with a plurality of injection holes 42 arranged at intervals, so that refrigerant reaching the first cavity part 11 above the injection partition plate 4 from the refrigerant injection port 13 is injected from top to bottom through the injection holes 42. Like this, the setting of injection baffle 4 makes the refrigerant in the cavity unit 10 of pressure manifold 1 evenly spray along the vertical direction of perpendicular to, it is more even to make the refrigerant control reposition of redundant personnel, so that the refrigerant can be even get into in first pressure manifold 3 through the hole of a plurality of transverse distribution with the pipe orifice department of first pressure manifold 3 of intercommunication chamber intercommunication, in addition, can also increase the refrigerant volume that gets into first pressure manifold 3 department in the same time quantum, thereby solve the microchannel heat exchanger in the air conditioner of the fan type of going out among the prior art and have the inhomogeneous problem of reposition of redundant personnel.

Specifically, first shunt 3 is flat pipe, and flat pipe sets up with the orificial width direction perpendicular to vertical direction of intercommunication chamber intercommunication, and along the direction of the vertical direction of perpendicular to, the mouth of pipe of flat pipe includes a plurality of through-holes that set up at interval in proper order to make flat pipe and intercommunication chamber intercommunication.

Preferably, the cavity unit 10 is provided in plurality, and the plurality of cavity units 10 are sequentially arranged from top to bottom. In the top-down direction, the header 1 is divided into a plurality of chamber units 10 separated from each other.

Further, the number of the first shunt tubes 3 corresponding to the plurality of cavity units 10 is sequentially increased along the top-down direction.

Along top-down's direction, each first shunt tubes 3 interval sets gradually, and to going up out the fan type, the wind speed of the top is big, and the wind speed of the following is little, and in the heating cycle process, the cavity unit 10 that is located the top of pressure manifold 1 can the refrigerant volume of evaporating more, and the quantity of its first shunt tubes 3 that needs is also less, consequently, along top-down's direction, the quantity of first shunt tubes 3 should increase in proper order.

In the case where the number of the first branch pipes 3 is sequentially increased in the top-down direction, the total area of the injection holes 42 of the corresponding injection partition plate 4 is sequentially increased in order to improve the uniformity of the refrigerant distribution.

Optionally, the number of the injection holes 42 on the injection partition plate 4 corresponding to the plurality of cavity units 10 is sequentially increased along the top-down direction; and/or the sizes of the injection holes 42 on the injection partition plates 4 are the same, and the areas of the injection holes 42 on the injection partition plates 4 corresponding to the plurality of cavity units 10 are sequentially increased along the direction from top to bottom.

The fact that the injection holes 42 of the respective injection partition plates 4 have the same size means that the injection holes 42 of the same injection partition plate 4 have the same shape and size.

Alternatively, the injection holes 42 of the injection partition plate 4 may have a circular or square or oval shape.

The injection partition plate 4 includes a plate body portion 41 and a plurality of injection holes 42 provided on the plate body portion 41, and the shape of the plate body portion 41 is provided corresponding to the shape of the cross section of the communication chamber of the chamber unit 10. The arrangement of the jet holes 42 on the jet partition plates 4 is similar to the multi-hole arrangement at the shower nozzle, and the difference of the number of the jet holes 42 of each jet partition plate 4, the difference of the size and the area of the jet holes 42 and the difference of the number of each group of first branch flow pipes 3 are arranged along the direction from top to bottom so as to correspond to the difference of the upper and lower wind speeds in the upper air outlet machine type, thereby realizing the uniform distribution and the branch flow of the refrigerant in the branch flow pipes 1.

Preferably, the microchannel heat exchanger further comprises a plurality of draft tubes 7, and the plurality of draft tubes 7 are arranged in one-to-one correspondence with the plurality of cavity units 10; both ends of each drainage tube 7 are communicated with the cavity below the injection partition plate 4 in the corresponding cavity unit 10, and the pipe openings of the first branch flow tubes 3, which are communicated with the communication cavity, are positioned between both ends of the corresponding drainage tubes 7.

The arrangement of the draft tube 7 can lead the liquid refrigerant deposited at the bottom of the second cavity part 12 of the communicating cavity into the upper part of the second cavity part 12, so that the liquid refrigerant enters the circulation again, and the uniformity of refrigerant flow distribution is improved.

The liquid refrigerant is stored at the bottom of the drainage tube 7, and the flow velocity below the drainage tube is very small, while the flow velocity above the drainage tube is very large, so that the pressure difference is generated due to the flow velocity difference according to the bernoulli equation, and the liquid refrigerant at the bottom of the second cavity 12 is introduced into the upper part of the second cavity 12 to be circulated again.

Both ends of the draft tube 7 are communicated with the second chamber portion 12 below the spraying partition 4, the first end 71 of the draft tube 7 is an inlet, the second end 72 is an outlet, the first end 71 is disposed below all the first shunt tubes 3 in the corresponding second chamber portion 12, and the second end 72 is disposed above all the first shunt tubes 3 in the corresponding second chamber portion 12.

Specifically, the draft tube 7 may be set to different tube diameters according to the position of the corresponding chamber unit 10.

As shown in fig. 1, the microchannel heat exchanger further includes liquid distributors 6, and the liquid distributors 6 are respectively communicated with the refrigerant injection ports 13 of the cavity units 10 to respectively supply the refrigerant into the cavity units 10. When the air conditioner is in the heating cycle process, the refrigerant flows into the collecting pipe 1 through the liquid separator 6.

Specifically, the microchannel heat exchanger further comprises a plurality of second shunt pipes 5, the plurality of second shunt pipes 5 are arranged in one-to-one correspondence to the plurality of refrigerant injection ports 13, and each second shunt pipe 5 is located between the liquid separator 6 and the corresponding refrigerant injection port 13 so as to communicate the liquid separator 6 with each refrigerant injection port 13.

Specifically, the second branch pipe 5 includes a branch capillary tube 52 and a branch connection pipe 51 connected to each other, the branch capillary tube 52 is connected to the liquid separator 6, and the branch connection pipe 51 is connected to the corresponding refrigerant injection port 13.

The diversion capillaries 52 are correspondingly arranged between the liquid separator 6 and each cavity unit 10 one by one, the length of the diversion capillary 52 corresponding to each cavity unit 10 is also arranged according to the best matching diversion effect, along the direction from top to bottom, the length of each diversion capillary 52 is sequentially increased, the longer the length of the diversion capillary 52 is, the larger the flow resistance to the refrigerant is, so that the amount of the refrigerant entering each cavity unit 10 is sequentially reduced, the difference of the air volume in the direction from top to bottom is adapted, and the requirements of the evaporation speed and the refrigerant evaporation amount of the refrigerant to each first diversion pipe 3 are met.

The shunting connection pipe 51 is arranged on the collecting pipe 1 and is communicated with a refrigerant jet orifice at the first cavity part 11 above the corresponding injection partition plate 4, the shunting connection pipe 51 is arranged above the corresponding cavity unit 10 in a shunting manner, and the part of the communication cavity below the shunting connection pipe 51 can play a role in storing refrigerants in the refrigeration cycle process, so that the problem that the refrigerant amount in the refrigeration cycle process and the heating cycle process is not matched is solved, and an external liquid storage tank is not required to be added.

Specifically, the microchannel heat exchanger further comprises: the collecting pipe comprises a plurality of isolation components 2, wherein the isolation components 2 are arranged in the collecting pipe 1 at intervals along the vertical direction so as to divide the collecting pipe 1 into a plurality of cavity units 10 which are sequentially arranged from top to bottom.

Specifically, the partition member 2 is a solid partition plate to separate the respective cavity units 10 from each other.

Optionally, each isolation member 2 is movably disposed relative to the position of the header 1, so as to adjust the number of the first branch pipes 3 corresponding to the corresponding chamber unit 10 by adjusting the position of the isolation member 2.

The invention also provides air conditioning equipment which comprises an air conditioning indoor unit and an air conditioning outdoor unit, wherein a heat exchanger is arranged in the air conditioning outdoor unit, and the heat exchanger is the micro-channel heat exchanger.

Specifically, the air conditioner outdoor unit in the air conditioning equipment is of an upper fan outlet type, and after the micro-channel heat exchanger is adopted, the problems of uneven up-and-down flow distribution and uneven left-and-right flow distribution of the collecting pipe 1 caused by the arrangement of the micro-channel heat exchanger in the upper fan outlet type can be well solved, so that the micro-channel heat exchanger has a good heat exchange effect.

In the air conditioning equipment with the micro-channel heat exchanger, the working process of the micro-channel heat exchanger is as follows:

in the heating cycle of the air conditioner, the refrigerant flows in the direction of the compressor → the indoor unit of the air conditioner → the outdoor unit of the air conditioner → the compressor, and the refrigerant condenses in the indoor unit of the air conditioner to release heat and then reaches the outdoor unit of the air conditioner to evaporate and absorb heat so as to heat the indoor air. Wherein, in the microchannel heat exchanger of the outdoor unit of air conditioner, the refrigerant passes through the knockout 6, reposition of redundant personnel capillary 52 and reposition of redundant personnel connecting pipe 51 get into the communicating cavity of each cavity unit 10 of pressure manifold 1, later flow out through a plurality of first reposition of redundant personnel 3, at first adjust the refrigerant volume that gets into the communicating cavity of each cavity unit 10 through reposition of redundant personnel capillary 52, reposition of redundant personnel capillary 52 that every cavity unit 10 corresponds can set up different length, in order to carry out more meticulous regulation to the flow of refrigerant, the refrigerant gets into in the first cavity portion 11 of every cavity unit 10 top through reposition of redundant personnel connecting pipe 51, jet below through the injection baffle 4 who takes jet orifice 42, so that each first reposition of redundant personnel 3 can obtain comparatively even refrigerant volume.

In addition, the liquid refrigerant deposited at the bottom of the communicating chamber can be guided to the upper part of the second chamber body part 12 through the draft tube 7 to be circulated again, so that the deposition of the partial liquid refrigerant is prevented.

During a refrigeration cycle of the air conditioner, the refrigerant flows in the direction of the compressor → the outdoor unit → the indoor unit → the compressor, condenses and releases heat in the outdoor unit, and then evaporates and absorbs heat in the indoor unit to cool the indoor air. In the micro-channel heat exchanger of the outdoor unit of the air conditioner, the refrigerant enters the corresponding communicating cavities from the first branch pipes 3, and only when the height of the refrigerant entering the communicating cavities is higher than that of the branch connecting pipes 51, the liquid refrigerant can be discharged out of the branch pipes 1 through the branch connecting pipes 51. Because reposition of redundant personnel connecting pipe 51 is located the top of intercommunication chamber, the space that is located the intercommunication chamber below in pressure manifold 1 can store liquid refrigerant, and then under the condition that does not increase external liquid storage pot, solves the unmatched problem of refrigerant volume in refrigeration cycle process and the heating cycle process.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

(1) through the setting of spraying baffle 4, improve the reposition of redundant personnel homogeneity of refrigerant along the vertical direction of perpendicular to, improve the heat transfer effect of heating cycle process to make the refrigerant can evenly get into in the flat pipe through a plurality of holes of the transverse distribution of each flat pipe mouth department, solved the reposition of redundant personnel difficult problem of refrigerant along the vertical direction of perpendicular to of microchannel heat exchanger under the heating cycle process.

(2) Through the setting of drainage tube 7, improve the reposition of redundant personnel homogeneity of refrigerant along vertical direction, the refrigerant that has reduced the gas-liquid two-phase state receives the influence of gravity can appear the appearance of certain gas-liquid layering phenomenon, liquid refrigerant top-down evenly distributed to make the refrigerant flow that enters into each flat intraductal that top-down arranged tend to even, solved the refrigerant of microchannel heat exchanger under the heating cycle process along the reposition of redundant personnel difficult problem of vertical direction, improved the heat transfer effect of microchannel heat exchanger.

(3) The problem of go up the air-out machine type in the difference of upper and lower wind speed lead to microchannel heat exchanger uneven heat transfer is solved.

(4) The refrigerant injection opening and the flow dividing connecting pipe 51 are arranged, so that the problem that the refrigerant amount is not matched in the refrigeration cycle process and the heating cycle process is solved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. The utility model provides a microchannel heat exchanger, includes pressure manifold (1), pressure manifold (1) including cavity unit (10) that have the intercommunication chamber and with a set of first shunt tubes (3) of intercommunication chamber intercommunication, its characterized in that, pressure manifold (1) is vertical to be placed, cavity unit (10) include:

the injection partition plate (4) is arranged in the communicating cavity, the refrigerant injection port (13) is positioned above the injection partition plate (4), and the group of first branch pipes (3) are communicated with a cavity of the communicating cavity, which is positioned below the injection partition plate (4);

the injection partition plate (4) is provided with a plurality of injection holes (42) arranged at intervals, so that the refrigerant reaching the upper part of the injection partition plate (4) from the refrigerant injection hole (13) is injected downwards through the injection holes (42).

2. The microchannel heat exchanger according to claim 1, wherein the cavity unit (10) is plural, and the plural cavity units (10) are arranged in sequence from top to bottom.

3. The microchannel heat exchanger according to claim 2, wherein the number of the first flow-dividing pipes (3) corresponding to the plurality of the cavity units (10) is sequentially increased in a top-down direction.

4. The microchannel heat exchanger of claim 2,

the number of the injection holes (42) on the injection partition plates (4) corresponding to the plurality of cavity units (10) is increased in sequence along the direction from top to bottom; and/or the presence of a gas in the gas,

the sizes of the spray holes (42) on the spray partition plates (4) are the same, and the areas of the spray holes (42) on the spray partition plates (4) corresponding to the cavity units (10) are sequentially increased along the direction from top to bottom.

5. The microchannel heat exchanger according to claim 2, further comprising a plurality of draft tubes (7), the plurality of draft tubes (7) being provided in one-to-one correspondence with the plurality of cavity units (10); both ends of each drainage tube (7) are communicated with the corresponding cavity below the injection partition plate (4) in the cavity unit (10), and the pipe openings of the first shunt pipes (3) in each group, which are communicated with the communication cavity, are positioned between both ends of the corresponding drainage tubes (7).

6. The microchannel heat exchanger according to claim 2, further comprising liquid distributors (6), wherein the liquid distributors (6) are respectively communicated with the refrigerant injection ports (13) of the cavity units (10) to respectively supply the refrigerant into the cavity units (10).

7. The microchannel heat exchanger as recited in claim 6 further comprising a plurality of second shunt tubes (5), wherein the plurality of second shunt tubes (5) are disposed in one-to-one correspondence with the plurality of refrigerant injection ports (13), and each second shunt tube (5) is disposed between the liquid separator (6) and the corresponding refrigerant injection port (13) to communicate the liquid separator (6) with each refrigerant injection port (13), respectively.

8. The microchannel heat exchanger according to claim 7, wherein the second bypass pipe (5) comprises a bypass capillary pipe (52) and a bypass connecting pipe (51) connected with each other, the bypass capillary pipe (52) is connected with the liquid distributor (6), and the bypass connecting pipe (51) is connected with the corresponding refrigerant injection port (13).

9. The microchannel heat exchanger according to claim 2, further comprising a plurality of isolation members (2), wherein the isolation members (2) are arranged in the header pipe (1) at intervals along the vertical direction so as to divide the header pipe (1) into a plurality of cavity units (10) arranged in sequence from top to bottom.

10. The microchannel heat exchanger according to claim 9, wherein each of the spacer members (2) is movably disposed with respect to the position of the header (1) to adjust the number of the first flow-dividing pipes (3) corresponding to the respective cavity units (10) by adjusting the position of the spacer member (2).

11. An air conditioning apparatus comprising an indoor unit and an outdoor unit, wherein a heat exchanger is disposed in the outdoor unit, wherein the heat exchanger is the microchannel heat exchanger according to any one of claims 1 to 10.

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