CN114234700B

CN114234700B - Collecting pipe assembly, micro-channel heat exchanger and air conditioning system

Info

Publication number: CN114234700B
Application number: CN202111584016.8A
Authority: CN
Inventors: 尹东; 吴迎文; 杨瑞琦; 郭忠玉; 吕言; 马腾飞
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-12-13
Anticipated expiration: 2041-12-22
Also published as: CN114234700A

Abstract

The application provides a collector subassembly, microchannel heat exchanger and air conditioning system. The collecting pipe assembly comprises a collecting pipe body and a circulating channel, wherein the collecting pipe body comprises a circulating channel; the circulating channel wall is provided with an injection hole and a diversion hole, the injection hole injects fluid into the circulating channel, the fluid can circularly flow along the circulating channel, and the diversion hole is used for exporting the fluid. Set up circulation channel in the collecting pipe body to through setting up the jet orifice, make the fluid in the circulation channel be in the circulation flow, ensure that everywhere liquid refrigerant fluid is in the even state that distributes in the circulation channel, can guarantee like this that the liquid refrigerant fluid that the water conservancy diversion hole was derived can not appear shunting uneven condition, thereby make the intraductal branch flow of collecting pipe and microchannel heat exchanger even.

Description

Collecting pipe assembly, micro-channel heat exchanger and air conditioning system

Technical Field

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

Background

The existing micro-channel heat exchanger consists of two collecting pipes, a plurality of flat pipes and fins. The collecting pipe is generally vertically arranged, when the heat exchanger is used for an evaporator, two-phase refrigerants enter from the lower part of the collecting pipe, the liquid refrigerants are unevenly distributed due to the influence of gravity and flow patterns, the lower flat pipe of the same flow has relatively more liquid refrigerants, and the upper flat pipe has relatively less or even no liquid refrigerants, so that the performance of the heat exchanger cannot be fully exerted, and the refrigerating and heating performance of the whole machine is restricted.

Disclosure of Invention

Therefore, the application provides a collecting pipe subassembly, microchannel heat exchanger and air conditioning system, can solve among the prior art refrigerant maldistribution in the collecting pipe and make the uneven problem of upper and lower flat tube reposition of redundant personnel.

In order to solve the above problem, the present application provides a header assembly, including:

a manifold body including a circulation channel;

the circulating channel wall is provided with an injection hole and a diversion hole, the injection hole injects fluid into the circulating channel, the fluid can circularly flow along the circulating channel, and the diversion hole is used for exporting the fluid.

Optionally, the manifold body includes a first branch, a second branch and a short pipe, the first branch and the second branch are vertically arranged side by side, and the short pipe is connected between the first branch and the second branch; the jet holes are formed in the bottom ends of the first branch pipe or the second branch pipe, and the diversion holes are formed in the short pipe.

Optionally, the short pipes are provided with at least two short pipes, and are uniformly distributed along the extension direction of the first branch pipe or the second branch pipe.

Optionally, the aperture of the injection hole is 2.5-3.5mm.

According to another aspect of the present application, there is provided a microchannel heat exchanger comprising a header assembly as described above.

Optionally, the microchannel heat exchanger further comprises a second collecting pipe and a flat pipe, one end of the flat pipe is communicated with the flow guide hole, and the other end of the flat pipe is communicated with the second collecting pipe.

Optionally, the collecting pipe assembly and the second collecting pipe are arranged on the same side of the flat pipe in a staggered manner; the flat pipe is in a snake-shaped bent shape.

Optionally, the flat pipe is provided with a heat sink.

According to yet another aspect of the present application, there is provided an air conditioning system comprising a header assembly as described above or a microchannel heat exchanger as described above.

The application provides a pressure manifold subassembly includes: a manifold body comprising a circulation channel; the circulating channel wall is provided with an injection hole and a diversion hole, the injection hole injects fluid into the circulating channel, the fluid can circularly flow along the circulating channel, and the diversion hole is used for exporting the fluid.

Set up circulation channel in the collecting pipe body to through setting up the jet orifice, make the fluid in the circulation channel be in the circulation flow, ensure that everywhere liquid refrigerant fluid is in the even state that distributes in the circulation channel, can guarantee like this that the liquid refrigerant fluid that the water conservancy diversion hole was derived can not appear shunting uneven the condition, thereby make the collecting pipe reposition of redundant personnel even, and the branch flow is even in the microchannel heat exchanger.

Drawings

Fig. 1 is a schematic structural view of a manifold assembly according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a first manifold in 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 view of a flat tube in the embodiment of the present application.

The reference numerals are represented as:

1. a heat sink; 2. a manifold assembly; 3. flat tubes; 4. a second header; 5. a second branch pipe; 6. a short pipe; 61. a flow guide hole; 7. a first branch pipe; 71. and ejecting the hole.

Detailed Description

Referring collectively to fig. 1-4, in accordance with an embodiment of the present application, a manifold assembly 2 includes:

a manifold body including a circulation channel;

the circulation channel wall is provided with an injection hole 71 and a diversion hole 61, the injection hole 71 injects fluid into the circulation channel, the fluid can circularly flow along the circulation channel, and the diversion hole 61 is used for exporting the fluid.

Because the circulating channel is arranged in the collecting pipe body, the fluid is injected through the injection hole 71, and the fluid circularly flows along the circulating channel, so that the liquid refrigerant fluid in the whole circulating channel is in a uniformly distributed state, and the liquid refrigerant fluid guided out by the guide holes 61 at different positions is basically uniform. The micro-channel heat exchanger adopting the collecting pipe assembly 2 can improve the uniform distribution and the heat exchange performance of the heat exchanger.

In the circulating channel, multiple channels are adopted to participate in circulating flow, so that the fluid distribution is more uniform, and the heat exchange is more uniform.

In some embodiments, the collector body comprises a first branch pipe 7, a second branch pipe 5 and a short pipe 6, wherein the first branch pipe 7 and the second branch pipe 5 are vertically arranged side by side, and the short pipe 6 is connected between the first branch pipe 7 and the second branch pipe 5; the injection holes 71 are arranged at the bottom end of the first branch pipe 7 or the second branch pipe 5, and the diversion holes 61 are arranged on the short pipe 6.

The fluid is accelerated through the injection holes 71, the pressure of the high-speed fluid is reduced, the pressure at the bottom of the first branch pipe 7 is lower than that at the bottom of the second branch pipe 5, the refrigerant flows into the bottom of the first branch pipe 7 from the bottom of the second branch pipe 5 through the short pipe, the refrigerant of the second branch pipe 5 flows from top to bottom, the refrigerant flows from bottom to top in the first branch pipe 7 and flows to the second branch pipe 5 through the short pipe at the top, and therefore the refrigerant forms circular flow after entering the circulation channel.

As shown in fig. 1, the collector body structure adopts a first branch pipe 7 and a second branch pipe 5 which are vertically arranged, a plurality of short pipes 6 are arranged between the first branch pipe 7 and the second branch pipe 5, and the first branch pipe 7 is communicated with the second branch pipe 5 through the short pipes 6 to form a circulation channel; the injection hole 71 is arranged at the lower end of the first branch pipe 7, due to the injection effect, a negative pressure is formed at the bottom of the first branch pipe 7 close to the refrigerant near the injection hole 71, so that the refrigerant at the bottom of the second branch pipe 5 flows back to the first branch pipe 7 through the short pipe 6, under the influence of the refrigerant flowing back at the bottom, the refrigerant at the top of the second branch pipe 5 flows downwards, the refrigerant at the top of the first branch pipe 7 flows to the second branch pipe 5 through the short pipe 6, thereby forming refrigerant circulation, ensuring that the distribution of each liquid refrigerant in the branch pipe is basically uniform, and further ensuring that the liquid refrigerant entering the flat pipe 3 through the short pipe 6 is also basically uniform.

In some embodiments, the short pipes 6 are provided in at least two and are evenly distributed along the extension direction of the first branch pipe 7 or the second branch pipe 5.

As shown in fig. 1, three short pipes 6 are arranged, so that the circulating fluid can quickly reach a uniform state in multiple directions; the short pipes 6 can be provided in other suitable numbers according to the use requirements.

In some embodiments, the aperture of jet holes 71 is 2.5-3.5mm.

In order to form circulation, the jet holes 71 are small, and relative negative pressure is formed by accelerating refrigerants; the flow velocity of the refrigerant cannot be too low, the size of the injection hole 71 cannot be too large, the size of the optimal injection hole 71 of different machine types is different, the size of the injection hole 71 of a general high-calorie machine type is slightly larger, the size of the injection hole 71 of a small-calorie machine type is slightly smaller, the size of the injection hole 71 of a 35 machine type is about 3-3.5mm, and the size of the injection hole 71 of a 26 machine type is about 2.5-3 mm.

For smooth circulation, the joints of the first branch pipe 7, the second branch pipe 5 and the short pipe 6 are smooth, no protruding part is arranged inside, and the inner wall structures of the first branch pipe 7 and the second branch pipe 5 are kept intact and are not damaged by the short pipe 6.

According to another aspect of the present application, there is provided a microchannel heat exchanger comprising a header assembly 2 as described above.

In some embodiments, the microchannel heat exchanger further includes a second collecting pipe 4 and a flat pipe 3, where one end of the flat pipe 3 is communicated with the flow guide hole 61, and the other end is communicated with the second collecting pipe 4.

In the concrete structure of microchannel heat exchanger, still include second pressure manifold 4 and flat pipe 3, flat pipe 3 one end intercommunication water conservancy diversion hole 61 sends into even fluid, then collects in second pressure manifold 4, and the fluid homogeneity is good among all flat pipes 3, and the heat transfer performance of whole heat transfer structure obtains improving.

In some embodiments, the header assembly 2 and the second header 4 are staggered on the same side of the flat tubes 3; the flat tubes 3 are formed in a serpentine shape.

The flat tubes 3 are in a serpentine shape, so that different local resistances formed by transitional connection among the flat tubes 3 in the same path are avoided, the flow resistance of each path is uniform, and the uniform flow of each path of refrigerant is ensured; because the liquid refrigerant more evenly gets into in each way flat tube 3, promote heat exchanger heat transfer performance.

In some embodiments, the flat tubes 3 are provided with heat dissipation fins 1.

In order to improve the heat exchange effect of the flat tubes 3, the flat tubes 3 are provided with the radiating fins 1, so that the radiating area is increased.

Performance experiments prove that the performance of the circulating system pump heat exchanger with the jet holes 71 with the aperture phi of 3mm is better than that of the heat exchangers with other shunting schemes.

The following table shows that the experimental results of the same microchannel heat exchanger adopting different flow-dividing schemes are compared, the heat exchange capacity of the scheme of the circulating pump system is better than that of other schemes under the

evaporation working conditions

2, 3 and 4, but the heat exchange capacity of the scheme of the circulating pump system is equivalent to or slightly worse than that of other schemes under the evaporation working condition 1, which indicates that the establishment of the refrigerant circulation must have a certain flow rate (namely the aperture size of the injection hole 71 has a certain requirement), and the circulation cannot be established due to the low refrigerant flow rate; under the working condition 1, circulation cannot be established due to small flow velocity of the refrigerant, the flow distribution is uneven, and the heat exchange capacity is poor.

The micro-channel heat exchanger adopts the experimental results of different flow distribution schemes:

It will be readily appreciated by those skilled in the art that the above embodiments may be freely combined, superimposed without conflict.

The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be regarded as the protection scope of the present application.

Claims

1. A manifold assembly, comprising:

a manifold body including a circulation channel;

the circulating channel wall is provided with an injection hole (71) and a diversion hole (61), the injection hole (71) injects fluid into the circulating channel, the fluid can circularly flow along the circulating channel, and the diversion hole (61) is used for exporting the fluid;

the collecting pipe body comprises a first branch pipe (7), a second branch pipe (5) and a short pipe (6), the first branch pipe (7) and the second branch pipe (5) are vertically arranged side by side, and the short pipe (6) is connected between the first branch pipe (7) and the second branch pipe (5); the jet holes (71) are formed in the bottom ends of the first branch pipes (7) or the second branch pipes (5), and the diversion holes (61) are formed in the short pipes (6).

2. Header assembly according to claim 1, characterised in that said short pipes (6) are provided in at least two and are uniformly distributed along the extension of said first branch pipe (7) or said second branch pipe (5).

3. Header assembly according to claim 1, characterized in that the diameter of the orifice (71) is 2.5-3.5mm.

4. A microchannel heat exchanger comprising a header assembly (2) according to any one of claims 1 to 3.

5. The microchannel heat exchanger according to claim 4, further comprising a second collecting pipe (4) and a flat pipe (3), wherein one end of the flat pipe (3) is communicated with the flow guide hole (61), and the other end is communicated with the second collecting pipe (4).

6. The microchannel heat exchanger according to claim 5, wherein the header assembly (2) and the second header (4) are arranged on the same side of the flat tubes (3) in a staggered manner; the flat pipe (3) is in a snake-shaped bent shape.

7. The microchannel heat exchanger according to claim 5 or 6, wherein the flat tubes (3) are provided with fins (1).

8. An air conditioning system, characterized in that it comprises a header assembly (2) according to any one of claims 1 to 3 or a microchannel heat exchanger according to any one of claims 4 to 7.