CN214148433U - Liquid collecting pipe assembly, micro-channel heat exchanger and air conditioner - Google Patents

Abstract

The application provides a liquid collecting pipe assembly, a micro-channel heat exchanger and an air conditioner. This collector tube subassembly includes collector body and reposition of redundant personnel baffle subassembly, be provided with the flat tube groove on the collector body, reposition of redundant personnel baffle subassembly sets up in the collector body, reposition of redundant personnel baffle subassembly includes baffle and the trompil baffle that sets up along the length direction interval of collector body, be provided with the jet orifice on the trompil baffle, the cavity of collector body is divided into inflow chamber and jet chamber with the trompil baffle to the trompil baffle, the inflow chamber is located between baffle and the trompil baffle, the one side in inflow chamber is kept away from to the jet chamber that the jet chamber is located the trompil baffle, the jet chamber place side of trompil baffle is provided with at least one reposition of redundant personnel baffle, the reposition of redundant personnel baffle separates the jet chamber for two at least mutual independence and with the reposition of redundant personnel chamber of flat tube groove intercommunication, every reposition of redundant personnel chamber is through at least one jet orifice and inflow chamber intercommunication. According to the liquid collecting pipe assembly, the refrigerant distribution uniformity of the micro-channel heat exchanger can be improved, and the working performance of the micro-channel heat exchanger is improved.

Description

Liquid collecting pipe assembly, micro-channel heat exchanger and air conditioner

Technical Field

The application relates to the technical field of air conditioning, in particular to a liquid collecting pipe assembly, a micro-channel heat exchanger and an air conditioner.

Background

Compared with a fin heat exchanger, the micro-channel heat exchanger has the characteristics of large heat exchange area, low material cost, light weight and the like, and is a trend of future heat exchanger development. But the microchannel heat exchanger has the characteristics of more heat exchange pipelines, small flow channel and the like, so that the internal flow distribution is uneven, and the difficulty of flow equalization is further aggravated by phase change generated by refrigerant throttling, heat exchange and the like. Therefore, how to solve the problem of the uniformity of the distribution of the refrigerant in the microchannel heat exchanger, fully utilize the heat exchange area of the microchannel heat exchanger and play the advantages of the microchannel heat exchanger as much as possible is important, and the uniformity is also an important factor for restricting the application of the microchannel heat exchanger.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem that this application will be solved lies in providing a liquid collecting pipe subassembly, microchannel heat exchanger and air conditioner, can improve microchannel heat exchanger's refrigerant distribution homogeneity, improves microchannel heat exchanger's working property.

In order to solve the problem, the application provides a collector tube subassembly, including collector tube body and reposition of redundant personnel baffle subassembly, be provided with flat tube seat on the collector tube body, reposition of redundant personnel baffle subassembly sets up in the collector tube body, reposition of redundant personnel baffle subassembly includes baffle and the trompil baffle that sets up along the length direction interval of collector tube body, be provided with the jet orifice on the trompil baffle, the cavity of trompil body falls into inflow chamber and jet chamber with the trompil baffle, the inflow chamber is located between baffle and the trompil baffle, the jet chamber is located one side that the inflow chamber was kept away from to the trompil baffle, the jet chamber place side of trompil baffle is provided with at least one reposition of redundant personnel baffle, the reposition of redundant personnel baffle separates the jet chamber for two at least mutual independence and with the reposition of redundant personnel chamber of flat tub intercommunication, every reposition of redundant personnel chamber is through at least one jet orifice and inflow chamber intercommunication.

Preferably, one side of the inflow cavity, which is close to the flat tube groove, is provided with a flow passing plate, the flow passing plate is connected between the baffle plate and the flow dividing baffle plate, a liquid dividing cavity is enclosed among the flow passing plate, the baffle plate, the flow dividing baffle plate and the liquid collecting tube body, the inflow cavity and the liquid dividing cavity are separated by the flow passing plate, the flow passing plate is provided with a flow passing hole for communicating the inflow cavity with the liquid dividing cavity, and the inflow cavity is communicated with the flat tube groove through the liquid dividing cavity.

Preferably, the liquid collecting pipe body is further provided with a refrigerant interface, and the refrigerant interface is located on the side wall of the inflow cavity far away from the flat pipe groove.

Preferably, the cross-sectional area of the jet hole corresponding to each flow-dividing cavity decreases progressively along the direction close to the flat tube groove.

Preferably, each inflow cavity corresponds to one jet hole along the direction close to the flat pipe groove, and the sectional area of each jet hole is gradually reduced; or along the direction close to the flat tube groove, the number of the jet holes corresponding to each inflow hole is reduced progressively, and the sectional areas of the single jet holes are the same.

Preferably, the number of the flat tube grooves corresponding to the diversion cavity decreases along the direction close to the flat tube grooves.

Preferably, the shunting clapboard comprises a first clapboard and a second clapboard, the first clapboard is connected to the opening clapboard, and the second clapboard is positioned on one side of the first clapboard, which is far away from the opening clapboard, and extends to the inner wall of the liquid collecting pipe body towards the side where the flat pipe groove of the liquid collecting pipe body is positioned.

Preferably, the number of the flow dividing partition plates is multiple, the length of the first partition plate is gradually reduced, the width of the second partition plate is gradually reduced along the direction close to the flat pipe groove, and the flow dividing partition plates are positioned in flow dividing cavities formed by the adjacent flow dividing partition plates.

Preferably, the inflow chamber is located below the distribution chamber.

Preferably, be provided with a plurality of baffles in the collector tube body, a plurality of baffles are separated the collector tube body for the multistage, are provided with reposition of redundant personnel baffle assembly in every section collector tube body respectively.

According to another aspect of the present application, there is provided a microchannel heat exchanger, comprising a header assembly, a flat tube and a header tube, the header assembly being as described above, a first end of the flat tube being connected to the flat tube slot, and a second end of the flat tube being connected to the header tube.

According to another aspect of the present application, an air conditioner is provided, which comprises a microchannel heat exchanger, wherein the microchannel heat exchanger is the above microchannel heat exchanger.

Preferably, the air conditioner further comprises a compressor, an indoor heat exchanger and a throttling device, wherein the compressor, the indoor heat exchanger, the throttling device and the micro-channel heat exchanger are sequentially connected.

Preferably, the air conditioner further comprises a liquid separator, the liquid separator is connected between the throttling device and the micro-channel heat exchanger, the liquid separator comprises a liquid separating head and a flow dividing pipe, the liquid separating head is connected with the throttling device, and the flow dividing pipe is communicated to the inflow cavity.

Preferably, the air conditioner further includes a four-way valve to which an exhaust port and a suction port of the compressor, the micro channel heat exchanger and the indoor heat exchanger are connected.

The utility model provides a liquid collecting pipe assembly, including liquid collecting pipe body and reposition of redundant personnel baffle assembly, be provided with the flat tube groove on the liquid collecting pipe body, reposition of redundant personnel baffle assembly sets up in the liquid collecting pipe body, reposition of redundant personnel baffle assembly includes baffle and the trompil baffle that sets up along the length direction interval of liquid collecting pipe body, be provided with the jet orifice on the trompil baffle, the trompil baffle falls into the inflow chamber with the cavity of liquid collecting pipe body and sprays the chamber, the inflow chamber is located between baffle and the trompil baffle, it is located one side that the inflow chamber was kept away from to the trompil baffle to spray the chamber, the injection chamber place side of trompil baffle is provided with at least one reposition of redundant personnel baffle, the reposition of redundant personnel baffle will spray the chamber and separate for two at least mutual independence and with the reposition of redundant personnel chamber of flat tube groove intercommunication, every reposition of redundant personnel chamber is through at least one jet orifice and inflow chamber intercommunication. This liquid collecting pipe subassembly separates into a plurality of reposition of redundant personnel chambeies through reposition of redundant personnel baffle subassembly in the liquid collecting pipe body, a plurality of reposition of redundant personnel chambeies all communicate with the inflow chamber through the trompil baffle, consequently can guarantee that the refrigerant distribution that is located the refrigerant of inflow intracavity when getting into each reposition of redundant personnel chamber is more even, improve the distribution homogeneity of refrigerant in the liquid collecting pipe body, because every reposition of redundant personnel chamber all communicates with the inflow chamber through the jet orifice, consequently, can replace partial outside reposition of redundant personnel flow path, realize the reposition of redundant personnel effect, reduce the quantity of outside flow path, reduce the outer liquid head and divide the liquid degree of difficulty, improve the liquid distribution homogeneity of outer liquid head.

Drawings

FIG. 1 is a perspective view of a manifold assembly of the header assembly in accordance with an embodiment of the present application;

FIG. 2 is a view of the internal structure of a header assembly according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a microchannel heat exchanger according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of an air conditioner according to an embodiment of the present application.

The reference numerals are represented as:

1. a liquid collecting pipe body; 2. a baffle plate; 3. inserting a tube; 4. flat tubes; 5. a flow dividing partition plate; 6. an injection hole; 7. a jet chamber; 8. a gas connecting pipe; 9. a compressor; 10. a four-way valve; 11. an external gas collector; 12. a microchannel heat exchanger; 13. a shunt tube; 14. a liquid separation head; 15. a throttling device; 16. an indoor heat exchanger; 17. a perforated partition plate; 18. an inflow chamber; 19. an internal gas collector; 20. an overflow plate; 21. an overflowing hole; 22. a liquid separating cavity.

Detailed Description

Referring to fig. 1 to 4 in combination, according to the embodiment of the application, the liquid collecting pipe assembly comprises a liquid collecting pipe body 1 and a shunting partition plate assembly, a flat pipe groove is formed in the liquid collecting pipe body 1, the shunting partition plate assembly is arranged in the liquid collecting pipe body 1, the shunting partition plate assembly comprises a baffle 2 and an opening partition plate 17 which are arranged at intervals along the length direction of the liquid collecting pipe body 1, an injection hole 6 is formed in the opening partition plate 17, the opening partition plate 17 divides the cavity of the liquid collecting pipe body 1 into an inflow cavity 18 and a jet cavity 7, the inflow cavity 18 is located between the baffle 2 and the opening partition plate 17, the jet cavity 7 is located on one side, away from the inflow cavity 18, of the opening partition plate 17, the side, where the jet cavity 7 is located, is provided with at least one shunting partition plate 5, the shunting partition plate 5 divides the jet cavity 7 into at least two shunting cavities which are independent from each other and communicated with the flat pipe groove, and each shunting cavity is communicated with the inflow cavity 18 through at least one injection hole 6.

This liquid collecting pipe subassembly separates into a plurality of reposition of redundant personnel chambeies through reposition of redundant personnel baffle subassembly in liquid collecting pipe body 1, a plurality of reposition of redundant personnel chambeies all communicate with inflow chamber 18 through trompil baffle 17, the refrigerant is the same when the initial position of the in-process that enters into each reposition of redundant personnel chamber, consequently, can guarantee that the refrigerant distribution of the refrigerant that is located inflow chamber 18 when entering into each reposition of redundant personnel chamber is more even, improve the distribution homogeneity of refrigerant in liquid collecting pipe body 1, because every reposition of redundant personnel chamber all communicates with inflow chamber 18 through jet orifice 6, consequently, can replace partial outside reposition of redundant personnel flow path, realize the reposition of redundant personnel effect, reduce the quantity of outside flow path, reduce the outer liquid head and divide the liquid degree of difficulty, improve the liquid distribution homogeneity of outer liquid head.

Because the size of jet orifice 6 is less relatively, consequently the refrigerant can obtain spraying and atomizing from the in-process that the chamber 18 enters into the reposition of redundant personnel chamber through jet orifice 6 of entering, and the two-phase refrigerant of gas-liquid can be in each reposition of redundant personnel intracavity intensive mixing, enters into flat pipe 4 afterwards and exchanges heat, has further improved the homogeneity of refrigerant distribution in each flat pipe 4, has improved flat pipe 4's heat exchange efficiency.

One side of the inflow cavity 18 close to the flat pipe groove is provided with an overflowing plate 20, the overflowing plate 20 is connected between the baffle plate 2 and the flow dividing partition plate 5, a liquid dividing cavity 22 is enclosed among the overflowing plate 20, the baffle plate 2, the flow dividing partition plate 5 and the liquid collecting pipe body 1, the inflow cavity 18 and the liquid dividing cavity 22 are separated by the overflowing plate 20, the overflowing plate 20 is provided with an overflowing hole 21 communicating the inflow cavity 18 with the liquid dividing cavity 22, and the inflow cavity 18 is communicated with the flat pipe groove through the liquid dividing cavity 22.

The pipe section department of the liquid collecting pipe body 1 where the inflow cavity 18 is located is correspondingly provided with the flat pipe 4, if the refrigerant at the inflow cavity 18 directly enters the flat pipe 4 corresponding to the pipe section, because the resistance at the position is smaller, the flow of the refrigerant entering the flat pipe 4 through the position is larger, and the amount of the refrigerant entering the flat pipe 4 through the shunting cavity is smaller, which is not beneficial to the uniform distribution of the refrigerant in the flat pipe 4. Therefore, the overflowing plate 20 is additionally arranged on one side, close to the flat pipe groove, of the inflow cavity 18 in the application, the flat pipe groove and the inflow cavity 18 are separated by the overflowing plate 20, so that the refrigerant in the inflow cavity 18 cannot directly enter the flat pipe 4 corresponding to the pipe section, and the problem that the refrigerant directly flows away from the flat pipe 4 corresponding to the pipe section is solved.

In this embodiment, overflow hole 21 has been seted up on board 20, make overflow board 20 be close to the branch liquid chamber 22 of flat tub of one side and keep away from flat tub of one side inflow chamber 18 and can be linked together, simultaneously through overflow hole 21 increase refrigerant from the resistance that inflow chamber 18 entered into branch liquid chamber 22, make the refrigerant when entering into inflow chamber 18, can distribute to each branch liquid chamber and branch liquid chamber 22 more evenly, the homogeneity of refrigerant distribution has been improved, also make simultaneously and also can get into the refrigerant with the flat pipe 4 that inflow chamber 18 belongs to the pipe section, the problem that the flat pipe 4 that this pipeline section corresponds can't distribute the refrigerant smoothly because of overflowing existence of board 20 has been avoided, the whole heat exchange efficiency of flat pipe 4 has been improved.

The liquid collecting pipe body 1 is also provided with a refrigerant interface which is positioned on the side wall of the inflow cavity 18 far away from the flat pipe groove. An inner inserting pipe 3 is connected to the refrigerant interface, the inner inserting pipe 3 is used for connecting an external refrigerant into the inflow cavity 18, and the other end of the inner inserting pipe 3 is connected with an external shunt pipe 13.

In one embodiment, the cross-sectional area of the injection holes 6 corresponding to each distribution chamber decreases in the direction close to the flat tube groove, specifically, the number of the injection holes 6 corresponding to each distribution chamber may be the same or different, regardless of the number, the total flow area of the injection holes 6 corresponding to the first distribution chamber is larger than the total flow area of the injection holes 6 corresponding to the second distribution chamber in the direction close to the flat tube groove, and so on, the total flow area of the injection holes 6 is the smallest in the distribution chamber closest to the flat tube groove at the perforated partition plate 17.

In one embodiment, each inflow chamber 18 corresponds to one injection hole 6 along the direction close to the flat tube groove, and the cross-sectional area of each injection hole 6 is reduced. The injection hole 6 is located in the middle of two adjacent flow dividing partition plates 5, and the size of the opening is reduced along with the increase of the distance between the hole and the refrigerant interface.

In one embodiment, the number of the injection holes 6 corresponding to each inflow hole is decreased gradually along the direction close to the flat tube groove, the cross-sectional area of each injection hole 6 is the same, and the positions of the holes are uniformly arranged at the central position of the perforated partition plate 17 corresponding to each diversion cavity.

In one embodiment, the number of the flat tube grooves corresponding to the diversion cavity decreases along the direction that the injection hole 6 approaches the flat tube grooves. Because of the influence of gravity and refrigerant interface position, the position that jet orifice 6 is close to flat pipe 4 of the reposition of redundant personnel chamber control of refrigerant interface is higher, can control more flat pipe number, and jet orifice 6's total flow area is a little relatively big simultaneously, and flat pipe 4 on flow path upper portion can not supply liquid inadequately because of the gravity deposit of refrigerant like this, and other reposition of redundant personnel chambeies can set up different flat pipe numbers and efflux aperture according to the position to more conveniently realize the evenly distributed of refrigerant.

In one embodiment, the dividing baffle 5 comprises a first baffle 5a attached to the apertured baffle 17 and a second baffle 5b located on the side of the first baffle 5a remote from the apertured baffle 17 and extending to the inner wall of the body 1 towards the side of the body 1 where the flat channels are located. In this embodiment, the dividing partition plate 5 is L-shaped, wherein the first partition plate 5a is a long side of the L-shaped structure, and the second partition plate 5b is a short side of the L-shaped structure. The first partition plate 5a is a rectangular plate, the width is the same as that of the liquid collecting pipe body 1 at the position of the first partition plate, the two sides of the first partition plate 5a are in sealing contact with the inner wall of the liquid collecting pipe body 1, and the shape of the second partition plate 5b is matched with that of the cross section of the liquid collecting pipe body 1, for example, when the cross section of the liquid collecting pipe body 1 is rectangular, the shape of the second partition plate 5b is rectangular, when the cross section of the liquid collecting pipe body 1 is circular, the shape of the second partition plate 5b is semicircular, so that the second partition plate 5b is in sealing contact with the inner wall of the liquid collecting pipe body 1.

In this embodiment, the number of the dividing partition plates 5 is multiple, the length of the first partition plate 5a decreases progressively and the width of the second partition plate 5b decreases progressively along the direction close to the flat tube slot, and the dividing partition plate 5 is located in the dividing cavity formed by the adjacent dividing partition plates 5. Along the direction that is close to the flat tube groove, second reposition of redundant personnel baffle 5 is located the cavity that first reposition of redundant personnel baffle 5 and trompil baffle 17 and collecting body 1 enclose, and third reposition of redundant personnel baffle 5 is located the cavity that second reposition of redundant personnel baffle 5 and trompil baffle 17 and collecting body 1 enclose, analogizes in proper order to form a plurality of reposition of redundant personnel chambeies of mutual spaced. The starting points of the flow channels of the distributing cavities are all based on the perforated partition plate 17, and the starting points do not form barriers to each other in the refrigerant flowing process, so that the flow resistance in the refrigerant distributing process can be reduced to the maximum extent, and the refrigerant distributing efficiency and the refrigerant distributing uniformity are improved.

In one embodiment, the inflow chamber 18 is located below the distribution chamber.

In one embodiment, a plurality of baffles 2 are arranged in the liquid collecting pipe body 1, the liquid collecting pipe body 1 is divided into a plurality of sections by the baffles 2, and a shunting partition plate assembly is arranged in each section of the liquid collecting pipe body 1.

Referring to fig. 3 and 4 in combination, according to an embodiment of the present application, the microchannel heat exchanger includes a header assembly, a flat tube 4 and a header, the header assembly is the above-mentioned header assembly, a first end of the flat tube 4 is connected to the flat tube slot, and a second end of the flat tube 4 is connected to the header.

The gas collecting pipe in this embodiment includes an inner gas collecting pipe 19 and an outer gas collecting pipe 11, wherein the inner gas collecting pipe is directly connected to the flat pipe 4, and the outer gas collecting pipe 11 is communicated with the inner gas collecting pipe 19 through a gas connecting pipe 8.

In traditional microchannel heat exchanger, because a plurality of flat pipes of flow path control, ambient temperature is lower when the low temperature changes the frost, if the heat exchanger goes out the liquid not smoothly, causes the refrigerant to pile up easily, leads to the pipe temperature can't rise to higher temperature, continues to be cooled by the environment on the contrary, increases invalid defrosting time or reduces and changes the frost efficiency.

And adopt the microchannel heat exchanger of this application embodiment, when defrosting, the refrigerant flow direction is the same with the refrigeration, high temperature gaseous state refrigerant distributes each heat transfer flat pipe after getting into inside gas collecting pipe 19 by gas connecting pipe 8, external environment temperature is lower when defrosting, high temperature gas absorbs the liquefaction back and flows into in collecting liquid body 1, the position of top flat pipe 4 is higher, liquid receives gravity to influence bigger some, flow into the chamber 18 more easily, in addition interior intubate 3 is the straight tube and bottom the flow path, these will make liquid refrigerant can be smoothly from reposition of redundant personnel chamber entering inflow chamber 18, and flow out by interior intubate 3 at last, therefore can not produce liquid refrigerant and pile up and be cooled down, and finally lead to the problem that the defrosting pipe does not go on the temperature.

The interior intubate 3 of this application embodiment, the pipe diameter can be adjusted according to actual conditions, and the inserted part need not do any change, has consequently guaranteed that it is smooth and easy to go out liquid, simultaneously, because the liquid outlet is located the flow path bottom during defrosting, and the influence of gravity will more do benefit to liquid refrigerant circulation.

Referring to fig. 4 in combination, according to an embodiment of the present application, the air conditioner includes a microchannel heat exchanger 12, and the microchannel heat exchanger 12 is the above-described microchannel heat exchanger.

The air conditioner also comprises a compressor 9, an indoor heat exchanger 16 and a throttling device 15, wherein the compressor 9, the indoor heat exchanger 16, the throttling device 15 and the micro-channel heat exchanger 12 are sequentially connected. The above-mentioned throttling means is, for example, an electronic expansion valve.

The air conditioner also comprises a liquid separator, the liquid separator is connected between the throttling device 15 and the micro-channel heat exchanger 12, the liquid separator comprises a liquid separating head 14 and a shunt pipe 13, the liquid separating head 14 is connected with the throttling device 15, and the shunt pipe 13 is communicated with the inflow cavity 18. The shunt 13 is, for example, a capillary tube.

The air conditioner further includes a four-way valve 10, and an exhaust port and a suction port of the compressor 9, a micro channel heat exchanger 12 and an indoor heat exchanger 16 are connected to the four-way valve 10.

In the air conditioner of the embodiment of the present application, after the number of the L-shaped partition plates is changed, the number of the flat pipes controlled by each flow path is also changed, so that the total number of the flow paths of the micro-channel heat exchanger 12 is also changed, and the number of the corresponding inner insertion pipes 3, the number of the corresponding shunt pipes 13, and the number of the corresponding shunt holes of the shunt heads 14 are also changed. As much internal shunt as possible is utilized, namely more L-shaped partition plates are adopted, the number of external shunt tubes 13 and the number of holes of the shunt head 14 can be correspondingly reduced, the nonuniformity of external shunt is reduced, and the shunt efficiency and the shunt uniformity are improved.

When the air conditioner of the embodiment of the application heats, refrigerant gas flows into the indoor heat exchanger 16 through the four-way valve 10 after being compressed by the compressor 9 to become liquid, liquid refrigerant is throttled by the throttling device 15 and then is subjected to external shunting by the shunting head 14, and the shunting pipe 13 can preliminarily control the refrigerant quantity entering each flow path of the microchannel heat exchanger 12. The liquid refrigerant absorbs heat in the microchannel heat exchanger 12 and evaporates into gas, which flows into the low pressure side of the four-way valve 10 after being collected by the inner gas collecting pipe 19 and the outer gas collecting pipe 11 in sequence, and finally is sucked and compressed by the compressor 9 to form circulation. During refrigeration, the four-way valve 10 is switched, and meanwhile, the flow direction of a refrigerant is changed in the micro-channel heat exchanger 12 and the indoor heat exchanger 16, and detailed description is omitted.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims (15)

1. A liquid collecting pipe assembly is characterized by comprising a liquid collecting pipe body (1) and a shunting partition plate assembly, wherein a flat pipe groove is formed in the liquid collecting pipe body (1), the shunting partition plate assembly is arranged in the liquid collecting pipe body (1), the shunting partition plate assembly comprises a baffle (2) and an opening partition plate (17) which are arranged along the length direction of the liquid collecting pipe body (1) at intervals, a jet hole (6) is formed in the opening partition plate (17), the opening partition plate (17) divides a cavity of the liquid collecting pipe body (1) into an inflow cavity (18) and a jet cavity (7), the inflow cavity (18) is located between the baffle (2) and the opening partition plate (17), the jet cavity (7) is located on one side, away from the inflow cavity (18), of the opening partition plate (17), at least one shunting partition plate (5) is arranged on the side, where the jet cavity (7) is located, of the opening partition plate (17), the flow dividing partition plate (5) divides the jet flow cavity (7) into at least two flow dividing cavities which are mutually independent and communicated with the flat pipe grooves, and each flow dividing cavity is communicated with the inflow cavity (18) through at least one jet hole (6).

2. The header assembly of claim 1, characterized in that an overflow plate (20) is arranged on one side of the inflow cavity (18) close to the flat tube groove, the overflow plate (20) is connected between the baffle (2) and the flow dividing partition (5), a liquid dividing cavity (22) is enclosed among the overflow plate (20), the baffle (2), the flow dividing partition (5) and the header body (1), the inflow cavity (18) and the liquid dividing cavity (22) are separated by the overflow plate (20), an overflowing hole (21) for communicating the inflow cavity (18) with the liquid dividing cavity (22) is arranged on the overflow plate (20), and the inflow cavity (18) is communicated with the flat tube groove through the liquid dividing cavity (22).

3. The header assembly of claim 1, wherein the header body (1) is further provided with a coolant port, and the coolant port is located on a side wall of the inflow chamber (18) away from the flat tube groove.

4. A header assembly according to claim 1 wherein the cross-sectional area of the orifice (6) associated with each of said distribution chambers decreases in a direction approaching said channel.

5. A header assembly as claimed in claim 4 wherein, in a direction adjacent said flattened tube channels, each of said inlet chambers (18) corresponds to one of said jet holes (6), the cross-sectional area of the individual jet holes (6) decreasing; or, along the direction close to the flat tube groove, the number of the jet holes (6) corresponding to each inflow hole is reduced progressively, and the sectional areas of the single jet holes (6) are the same.

6. The header assembly of claim 1 wherein the number of flat channels associated with said distribution chamber decreases in a direction adjacent said flat channels.

7. A header assembly according to any one of claims 1 to 6, characterised in that the flow dividing baffle (5) comprises a first baffle (5a) and a second baffle (5b), the first baffle (5a) being attached to the apertured baffle (17), the second baffle (5b) being located on the side of the first baffle (5a) remote from the apertured baffle (17) and extending to the inner wall of the header body (1) towards the side of the header body (1) where the flat channels are located.

8. A collector tube assembly as claimed in claim 7, characterised in that said flow dividing partitions (5) are plural, said first partitions (5a) having decreasing lengths and said second partitions (5b) having decreasing widths in directions adjacent to said flat channels, said flow dividing partitions (5) being located in flow dividing cavities formed by adjacent ones of said flow dividing partitions (5).

9. A header assembly as claimed in any one of claims 1 to 6 wherein said inlet chamber (18) is located below said distribution chamber.

10. A collector tube assembly as claimed in any one of claims 1 to 6, characterised in that a plurality of said baffles (2) are provided within said collector tube body (1), said plurality of baffles (2) dividing said collector tube body (1) into a plurality of sections, said flow divider assembly being provided within each section of said collector tube body (1).

11. A microchannel heat exchanger comprising a header assembly, flat tubes (4) and a header, wherein the header assembly is the header assembly of any one of claims 1 to 10, wherein the first ends of the flat tubes (4) are connected to the flat tube slots, and wherein the second ends of the flat tubes (4) are connected to the header.

12. An air conditioner comprising a microchannel heat exchanger (12), wherein the microchannel heat exchanger (12) is the microchannel heat exchanger of claim 11.

13. Air conditioner according to claim 12, characterized in that it further comprises a compressor (9), an indoor heat exchanger (16) and a throttling device (15), said compressor (9), said indoor heat exchanger (16), said throttling device (15) and said microchannel heat exchanger (12) being connected in sequence.

14. The air conditioner according to claim 13, further comprising a liquid separator connected between the throttling device (15) and the microchannel heat exchanger (12), the liquid separator comprising a liquid separator head (14) and a flow dividing pipe (13), the liquid separator head (14) being connected with the throttling device (15), the flow dividing pipe (13) being connected to the inflow chamber (18).

15. The air conditioner according to claim 13, further comprising a four-way valve (10), wherein the discharge and suction ports of the compressor (9), the microchannel heat exchanger (12) and the indoor heat exchanger (16) are connected to the four-way valve (10).

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