CN215064000U

CN215064000U - Heat exchanger

Info

Publication number: CN215064000U
Application number: CN202120580334.6U
Authority: CN
Inventors: 梁新宇; 王冠军
Original assignee: Zhejiang Dunan Thermal Technology Co Ltd
Current assignee: Zhejiang Dunan Thermal Technology Co Ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-12-07
Anticipated expiration: 2031-03-22

Abstract

The utility model relates to a heat transfer technical field especially relates to a heat exchanger. The heat exchanger comprises a first collecting pipe, flat pipes and a distribution structure, wherein the distribution structure is arranged in the first collecting pipe and extends along the length direction of the first collecting pipe; the distribution structure comprises a first distribution plate and a second distribution plate, the first distribution plate divides the first collecting pipe into a first cavity and a second cavity, one end of the flat pipe is communicated with the first cavity, the second distribution plate is arranged in the second cavity, one side of the second distribution plate is connected with the first distribution plate, and the second cavity can be divided into an inlet area and a reflux area; the first distribution plate is provided with a first distribution hole and a second distribution hole which are respectively communicated with the inlet area and the backflow area, a circulation channel is formed between one end, far away from the first distribution plate, of the second distribution plate and the first collecting pipe, and the inlet area is communicated with the backflow area through the circulation channel. The utility model has the advantages that: simple structure, gas-liquid mixing efficiency are high, the distribution is even and heat transfer effect is good.

Description

Heat exchanger

Technical Field

The utility model relates to a heat transfer technical field especially relates to a heat exchanger.

Background

The refrigerant distribution structure in the heat exchanger is used for distributing the refrigerant to ensure the uniform mixing of the refrigerant, so that the heat exchange of the heat exchanger is uniform.

The existing heat exchanger generally adopts the mode that a single distribution pipe is arranged in a collecting pipe for liquid separation, but a refrigerant entering the distribution pipe is a gas-liquid two-phase refrigerant, and the liquid-phase refrigerant is large in liquid-phase core, different in speed of the liquid-phase refrigerant and a gas-phase refrigerant and capable of rapidly rushing to the tail part of the distribution pipe, so that the refrigerant in the collecting pipe is unevenly distributed, the heat exchange of the heat exchanger is uneven, and the heat exchange efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a heat exchanger with simple structure, high gas-liquid mixing efficiency, uniform distribution and good heat exchange effect.

In order to solve the technical problem, the application provides the following technical scheme:

a heat exchanger comprises a first collecting pipe, a flat pipe and a distribution structure, wherein a collecting cavity is formed in the first collecting pipe, one end of the flat pipe is installed on the first collecting pipe and is communicated with the collecting cavity, and the distribution structure is arranged in the collecting cavity and extends along the length direction of the first collecting pipe; the distribution structure comprises a first distribution plate and a second distribution plate, wherein two ends of the first distribution plate are respectively connected with cavity walls at two ends of the manifold, the manifold is divided into a first cavity and a second cavity by the first distribution plate, one end of the flat pipe is communicated with the first cavity, the second distribution plate is arranged in the second cavity, one side of the second distribution plate is connected with the first distribution plate, the other side of the second distribution plate is connected with the cavity wall of the manifold, and the second cavity can be divided into an inlet area and a reflux area;

the first distribution plate is provided with a first distribution hole and a second distribution hole which are respectively communicated with the inlet area and the backflow area, two ends of the second distribution plate are respectively provided with a circulation channel, and the inlet area is communicated with the backflow area through the circulation channels.

In the application, the manifold is divided into the first chamber, the inlet area and the reflux area by the first distribution plate and the second distribution plate, so that the gas-liquid two-phase refrigerant is mixed more uniformly, and the heat exchange efficiency of the heat exchanger is improved; after the refrigerant enters from the inlet area, a part of the refrigerant is sprayed into the first cavity through the first distribution holes, and the gas-liquid refrigerant is mixed again; the other part of the refrigerant has larger inertia of the liquid refrigerant, most of the liquid refrigerant can flow in the collecting cavity quickly, and at the moment, because the inlet area and the two ends of the backflow area are communicated all the time through the circulation channel, the backflow area can play a role of dredging the refrigerant in the inlet area, so that the liquid refrigerant can flow into the backflow area from the circulation channel; the liquid phase core is large, so that the refrigerant in the reflux area is driven to flow in the direction opposite to the flow direction of the refrigerant in the inlet area, the refrigerant flows into the inlet area through the flow passage again, the refrigerant forms closed-loop flow in the inlet area and the reflux area, the disturbance of the refrigerant is enhanced, the uniform distribution of the gas-liquid two-phase refrigerant is facilitated, and the heat exchange efficiency is improved; meanwhile, the refrigerant in the backflow area can be sprayed into the first cavity from the second distribution hole, and the gas-liquid two-phase refrigerant is mixed again, so that the heat exchange efficiency is improved.

In one embodiment, the length of the second distribution plate is less than the length of the manifold along the length of the first header such that the flow channels are formed between the ends of the second distribution plate and the walls of the two end chambers of the manifold.

Due to the arrangement, the structure is simple, the processing is convenient, meanwhile, the two ends of the inlet area and the two ends of the backflow area are communicated through the circulation channel, most of the liquid refrigerant impacts the other end of the inlet area after flowing into the inlet area due to the large inertia of the liquid refrigerant, and at the moment, the refrigerant can flow into the backflow area from the circulation channel; the liquid phase core is large, so that the refrigerant in the backflow area can be driven to flow in the direction opposite to the flow direction of the refrigerant in the inlet area, the refrigerant flows into the inlet area through the circulation channel close to the inlet of the first collecting pipe, the refrigerant forms closed-loop flow in the inlet area and the backflow area, disturbance of the refrigerant is strengthened, uniform distribution of the gas-liquid two-phase refrigerant is facilitated, and heat exchange efficiency is improved.

In one embodiment, the second distribution plate has a slot/hole structure formed at both ends thereof, and the slot/hole structure forms the flow channel.

So set up, the refrigerant can form closed loop flow through the circulation passageway that slot/hole formed, strengthens the perturbation effect of refrigerant to improve heat exchange efficiency.

In one embodiment, the distribution structure is T-shaped, the first distribution plate is one piece, and the first distribution plate is disposed perpendicular to the second distribution plate.

So set up, be convenient for distribution structure's processing, and be favorable to the even distribution of gas-liquid two-phase refrigerant.

In one embodiment, the distribution structure is T-shaped, the first distribution plate has a first plate and a second plate, and the first plate, the second plate and the second distribution plate are vertically disposed therebetween.

The arrangement is favorable for uniform distribution of the gas-liquid two-phase refrigerant.

In one embodiment, the distribution structure is Y-shaped, the first distribution plate is one-piece and is arranged in a V-shape, the first distribution plate has a first connection portion, and the second distribution plate is connected with the first connection portion to form the distribution structure.

So set up, be convenient for processing, and the accommodation space of entrance area and backward flow district is great for the refrigerant can carry out abundant mixture through entrance area and backward flow district, and mixes again in spraying to first cavity through first distribution hole and second distribution hole, flows into flat pipe again, in order to improve heat exchange efficiency.

In one embodiment, the distribution structure is arranged in a Y shape, the first distribution plate has a third plate and a fourth plate, the third plate is connected with the fourth plate, the connected third plate and fourth plate are arranged in a V shape, the second distribution plate is connected with the third plate and fourth plate to form the distribution structure, and the included angles between the second distribution plate and the third plate and the fourth plate are both a, and the range of the included angle a is a > 90 °.

According to the arrangement, the angle between the second distribution plate and the third plate is the same as the included angle between the second distribution plate and the fourth plate, namely the volumes of the refrigerant contained in the inlet area and the refrigerant contained in the return area are the same, and at the moment, the distribution efficiency is optimal; if the space of the inlet area is larger than that of the reflux area, after the refrigerant enters, the liquid refrigerant gathered at the tail part of the first collecting pipe is more due to the larger inertia of the liquid refrigerant, the gathered liquid refrigerant cannot flow into the reflux area through the circulation channel in time to carry out reverse flow so as to form closed-loop flow, and a large amount of refrigerant is easy to be left at the tail part, so that the distribution efficiency is reduced; if the space of the inlet area is smaller than that of the reflux area, the refrigerant enters the reflux area from the circulation channel at the tail part, the reflux speed of the liquid refrigerant is slowed down due to overlarge capacity of the reflux area, and the liquid refrigerant flows into the circulation channel close to the inlet to flow, so that the disturbance intensity is reduced, the distribution time is prolonged, and the distribution efficiency is reduced.

In one embodiment, the first distribution plate is a single body and is disposed in an inverted V shape, the first distribution plate has a second connection portion, and the second distribution plate is connected to the second connection portion to form the distribution structure.

So set up, be convenient for process, and make the space increase of first cavity, the refrigerant that sprays from first distribution hole and second distribution hole can mix once more in first cavity, reentrant flat pipe in order to strengthen heat exchange efficiency.

In one embodiment, the first distribution plate is provided with a fifth plate and a sixth plate, the fifth plate is connected with the sixth plate, and the connected fifth plate and the sixth plate are arranged in an inverted V shape; the second distribution plate is connected with the fifth plate and the sixth plate to form the distribution structure, included angles between the second distribution plate and the fifth plate and included angles between the second distribution plate and the sixth plate are both B, and the range of the included angle B is B < 90 degrees.

The arrangement is such that the refrigerant can be mixed again in the first chamber to enhance the heat exchange efficiency.

In one embodiment, the number of the first distribution holes and the second distribution holes is multiple, and the first distribution holes and the second distribution holes are evenly distributed along the length direction of the first distribution plate at intervals.

So set up, can improve gas-liquid mixture speed, in time spray the refrigerant with evenly distributed, increase heat exchange efficiency.

Compared with the prior art, the heat exchanger provided by the application has the advantages that the first distribution plate and the second distribution plate are arranged, the manifold is divided into the first chamber, the inlet area and the backflow area, so that gas-liquid two-phase refrigerant is mixed more uniformly, and the heat exchange efficiency of the heat exchanger is improved; after the refrigerant enters from the inlet area, a part of the refrigerant is sprayed into the first cavity through the first distribution holes, and the gas-liquid refrigerant is mixed again; the other part of the refrigerant has larger inertia of the liquid refrigerant, most of the liquid refrigerant can flow in the collecting cavity quickly, and at the moment, because the inlet area and the two ends of the backflow area are communicated all the time through the circulation channel, the backflow area can play a role of dredging the refrigerant in the inlet area, so that the liquid refrigerant can flow into the backflow area from the circulation channel; the liquid phase core is large, so that the refrigerant in the reflux area is driven to flow in the direction opposite to the flow direction of the refrigerant in the inlet area, the refrigerant flows into the inlet area through the flow passage again, the refrigerant forms closed-loop flow in the inlet area and the reflux area, the disturbance of the refrigerant is enhanced, the uniform distribution of the gas-liquid two-phase refrigerant is facilitated, and the heat exchange efficiency is improved; meanwhile, the refrigerant in the backflow area can be sprayed into the first cavity from the second distribution hole, and the gas-liquid two-phase refrigerant is mixed again, so that the heat exchange efficiency is improved.

Drawings

Fig. 1 is a partial schematic view of a heat exchanger provided by the present invention.

Fig. 2 is a front view of the heat exchanger provided by the present invention.

Fig. 3 is a schematic cross-sectional view at a-a in fig. 2.

Fig. 4 is a schematic structural diagram of a distribution structure according to an embodiment of the present invention.

Fig. 5 is a partially enlarged view of fig. 3 at B.

Fig. 6 is a schematic diagram of a distribution structure according to another embodiment of the present invention.

Fig. 7 is a schematic diagram of a distribution structure according to another embodiment of the present invention.

In the figure, 100, a heat exchanger; 10. a first header; 11. an inlet; 12. a tail portion; 13. a first chamber; 14. a second chamber; 15. an inlet zone; 16. a reflux zone; 17. a manifold; 20. flat tubes; 30. a distribution structure; 31. a first distribution plate; 311. a first dispensing orifice; 312. a second dispensing aperture; 313. a first connection portion; 314. a second connecting portion; 315a, a first plate; 315b, a second plate; 315c, a third plate; 315d, a fourth plate; 315e, a fifth plate; 315f, a sixth plate; 32. a second distribution plate; 33. a flow-through channel; 40. a fin; 41. a second header.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the utility model provides a heat exchanger 100 installs refrigerant distribution structure 30 in this heat exchanger 100 for in time distribute the gas-liquid mixture refrigerant, and ensure the refrigerant misce bene, thereby improve heat exchange efficiency of heat exchanger 100.

The existing heat exchanger generally adopts the mode that a single distribution pipe is arranged in a collecting pipe for liquid separation, but because a refrigerant entering the distribution pipe is a gas-liquid two-phase refrigerant, the liquid phase core of the liquid refrigerant is large, the speeds of the liquid refrigerant and the gaseous refrigerant are different, the liquid refrigerant can quickly rush to the tail part of the distribution pipe, so that the refrigerant in the collecting pipe is unevenly distributed, the heat exchange of the heat exchanger is uneven, and the heat exchange efficiency is reduced.

Referring to fig. 1, the present application provides a heat exchanger 100, where the heat exchanger 100 includes a first collecting pipe 10, a flat pipe 20, and a distribution structure 30, a manifold 17 is disposed in the first collecting pipe 10, one end of the flat pipe 20 is mounted on the first collecting pipe 10 and is communicated with the manifold 17, and the distribution structure 30 is disposed in the manifold 17 and extends along a length direction of the first collecting pipe 10, so that a gas-liquid two-phase refrigerant entering the manifold 17 can be mixed more uniformly, and thus, the heat exchange efficiency of the heat exchanger 100 is improved.

Further, the first header 10 has an inlet 11 and a tail 12, the distribution structure 30 includes a first distribution plate 31 and a second distribution plate 32, two ends of the first distribution plate 31 are respectively connected to two end cavity walls of the manifold 17, the first distribution plate 31 divides the manifold 17 into a first chamber 13 and a second chamber 14, one end of the flat tube 20 is communicated with the first chamber 13, the second distribution plate 32 is disposed in the second chamber 14, and one side of the second distribution plate 32 is connected to the first distribution plate 31, and the other side is connected to the cavity wall of the manifold 17, and can divide the second chamber 14 into an inlet region 15 and a return region 16; the second distribution plate 32 is provided with flow channels 33 at both ends thereof, and communicates the inlet region 15 and the return region 16 through the flow channels 33; after the refrigerant enters the inlet area 15 from the inlet 11, a part of the refrigerant is relatively heavy and large in inertia due to the weight of the liquid refrigerant, and most of the liquid refrigerant can flow in the manifold 17 quickly, at this time, because the inlet area 15 and the return area 16 are always communicated through the circulation channel 33, the return area 16 can play a role in dredging the refrigerant in the inlet area 15, so that the liquid refrigerant can flow into the return area 16 from the circulation channel 33; meanwhile, the liquid phase core is large, so that the refrigerant in the return region 16 is driven to flow in the direction opposite to the flow direction of the refrigerant in the inlet region 15, the refrigerant flows into the inlet region 15 through the circulation channel 33 again, the refrigerant flows back and forth in the inlet region 15 and the return region 16, the disturbance of the refrigerant is enhanced, the uniform distribution of the gas-liquid two-phase refrigerant is facilitated, and the heat exchange efficiency is improved.

Specifically, the first distribution plate 31 is provided with a first distribution hole 311 and a second distribution hole 312 which are respectively communicated with the inlet area 15 and the return area 16, and a part of the refrigerant entering the inlet area 15 from the inlet 11 is injected into the first chamber 13 through the first distribution hole 311 to mix the gas-liquid refrigerant again; at the same time, the refrigerant flowing into the return region 16 can be injected from the second distribution holes 312 into the first chamber 13, and the gas-liquid two-phase refrigerant is mixed again, thereby improving the heat exchange efficiency.

Preferably, the number of the first distribution holes 311 and the second distribution holes 312 is multiple, and the multiple first distribution holes 311 and the multiple second distribution holes 312 are uniformly distributed along the length direction of the first distribution plate 31 at intervals, so as to increase the gas-liquid mixing speed, spray out the refrigerant in time to be uniformly distributed, and increase the heat exchange efficiency.

In the present application, the length of the second distributor plate 32 is less than the length of the manifold 17 along the length of the first manifold 10, such that flow channels 33 are formed between the two ends of the second distributor plate 32 and the walls of the two end chambers of the manifold 17; the structure is simple, the processing is convenient, meanwhile, the two ends of the inlet area 15 and the two ends of the return area 16 are communicated through the circulation channel 33, most of the liquid refrigerant can impact the other end of the inlet area 15 after flowing into the inlet area 15 due to the large inertia of the liquid refrigerant, and at the moment, the refrigerant can flow into the return area 16 from the circulation channel 33; the liquid phase core is large, so that the refrigerant in the reflux region 16 is driven to flow in the direction opposite to the flow direction of the refrigerant in the inlet region 15, so that the refrigerant flows into the inlet region 15 through the circulation channel 33 close to the inlet 11 of the first collecting pipe 10, the refrigerant forms closed-loop flow in the inlet region 15 and the reflux region 16, the disturbance of the refrigerant is enhanced, the uniform distribution of the gas-liquid two-phase refrigerant is facilitated, and the heat exchange efficiency is improved.

Of course, in other embodiments, the length of the second distribution plate 32 is not limited to be smaller than the length of the first distribution plate 31, and other methods may be used as long as the refrigerant can form a closed-loop flow in the inlet region 15 and the return region 16, for example, if the length of the second distribution plate 32 is equal to that of the first distribution plate 31, flow holes (not shown) are respectively opened at both ends of the second distribution plate 32, the refrigerant can directly flow through the flow holes, that is, the refrigerant corresponds to the flow channels 33 between the inlet region 15 and the return region 16, and the refrigerant can form a closed-loop flow in the manifold 17 through the opened flow holes; alternatively, flow grooves (not shown) may be formed at both ends of the second distribution plate 32, and the flow grooves and the wall of the manifold 17 may define a flow passage 33 therebetween, so that the refrigerant can flow in a closed loop.

Referring to fig. 2-5, in an embodiment, the distribution structure 30 is T-shaped, the first distribution plate 31 is integrated, and the first distribution plate 31 and the second distribution plate 32 are vertically disposed, so as to facilitate the processing of the distribution structure 30 and facilitate the uniform distribution of the gas-liquid two-phase refrigerant.

In another embodiment, referring to fig. 5, the distribution structure 30 is T-shaped, the first distribution plate 31 has a first plate 315a and a second plate 315b, and the first plate 315a and the second plate 315b are vertically disposed with respect to the second distribution plate 32, so as to facilitate uniform distribution of the gas-liquid two-phase refrigerant.

Referring to fig. 6, in an embodiment, the distribution structure 30 is Y-shaped, the first distribution plate 31 is integrated, the first distribution plate 31 is V-shaped, the first distribution plate 31 has a first connection portion 313, the second distribution plate 32 is connected to the first connection portion 313 to form the distribution structure 30, and the receiving space between the inlet region 15 and the return region 16 is large, so that the refrigerant can be sufficiently mixed by the inlet region 15 and the return region 16, and can be injected into the first chamber 13 through the first distribution holes 311 and the second distribution holes 312 to be mixed, and then flows into the flat tubes 20, thereby improving the heat exchange efficiency.

In another embodiment, the distribution structure 30 is disposed in a Y-shape, the first distribution plate 31 has a third plate 315c and a fourth plate 315d, the third plate 315c is connected to the fourth plate 315d, the connected third plate 315c and fourth plate 315d are disposed in a V-shape, the second distribution plate 32 is connected to the third plate 315c and fourth plate 315d to form the distribution structure 30, and the included angles between the second distribution plate 32 and the third plate 315c, the fourth plate 315d are both a, and the range of the included angle a is greater than 90 °; the angle between the second distribution plate 32 and the third plate 315c is the same as the angle between the second distribution plate 32 and the fourth plate 315d, that is, the volumes of the refrigerant contained in the inlet region 15 and the return region 16 are the same, and at this time, the distribution efficiency is optimal; if the space of the inlet region 15 is larger than the space of the return region 16, after the refrigerant enters, because the inertia of the liquid refrigerant is larger, the liquid refrigerant accumulated at the tail portion 12 of the first collecting pipe 10 is more, and the accumulated liquid refrigerant cannot flow into the return region 16 through the flow passage 33 in time to perform the reverse flow direction to form a closed loop flow, and a large amount of refrigerant is easy to be left at the tail portion 12, thereby reducing the distribution efficiency; if the space of the inlet region 15 is smaller than the space of the return region 16, the refrigerant enters the return region 16 from the flow channel 33 of the tail portion 12, the liquid refrigerant flows back slowly due to the large capacity of the return region 16, and then flows into the flow channel 33 near the inlet 11, so that the disturbance intensity is reduced, the distribution time is increased, and the distribution efficiency is reduced.

Referring to fig. 7, in an embodiment, the first distribution plate 31 is an integral body, the first distribution plate 31 is disposed in an inverted V shape, the first distribution plate 31 has the second connection portion 314, and the second distribution plate 32 is connected to the second connection portion 314 to form the distribution structure 30, so that the processing is facilitated, and the space of the first chamber 13 is increased, and the refrigerants injected from the first distribution holes 311 and the second distribution holes 312 can be mixed again in the first chamber 13 and then enter the flat tubes 20 to enhance the heat exchange efficiency.

In another embodiment, the first distribution plate 31 has a fifth plate 315e and a sixth plate 315f, the fifth plate 315e is connected to the sixth plate 315f, and the connected fifth plate 315e and sixth plate 315f are disposed in an inverted V shape; the second distribution plate 32 is connected to the fifth and sixth plates 315e, 315f to form the distribution structure 30, and the included angles between the second distribution plate 32 and the fifth and sixth plates 315e, 315f are all B, and the included angle B ranges from B < 90 °, so that the refrigerants can be mixed again in the first chamber 13 to enhance the heat exchange efficiency.

Of course, in other embodiments, the present invention is not limited to these arrangements, as long as the inlet area 15 and the return area 16, which are communicated with each other and make the refrigerant form a closed loop flow, are formed in the first collecting pipe 10, and both the inlet area 15 and the return area 16 can be communicated with the first chamber 13, so as to achieve the same effect as the embodiments of the present invention.

Referring to fig. 1, the heat exchanger 100 provided in the present application further includes a fin 40 and a second collecting pipe 41, one end of the flat pipe 20 is communicated with the first collecting pipe 10, and the other end of the flat pipe 20 is communicated with the second collecting pipe 41, and the fin 40 is disposed in a corrugated shape along the length direction of the flat pipe 20, so that the refrigerant can be better transmitted after being uniformly distributed by the distribution structure 30, and the heat exchange efficiency of the heat exchanger 100 is improved.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

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

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.

Claims

1. A heat exchanger comprises a first collecting pipe, a flat pipe and a distribution structure, wherein a collecting cavity is formed in the first collecting pipe, one end of the flat pipe is installed on the first collecting pipe and is communicated with the collecting cavity, and the distribution structure is arranged in the collecting cavity and extends along the length direction of the first collecting pipe;

the distribution structure is characterized by comprising a first distribution plate and a second distribution plate, wherein two ends of the first distribution plate are respectively connected with cavity walls at two ends of the manifold, the manifold is divided into a first cavity and a second cavity by the first distribution plate, one end of the flat pipe is communicated with the first cavity, the second distribution plate is arranged in the second cavity, one side of the second distribution plate is connected with the first distribution plate, the other side of the second distribution plate is connected with the cavity wall of the manifold, and the second cavity can be divided into an inlet area and a backflow area;

2. The heat exchanger of claim 1, wherein the length of the second distribution plate is less than the length of the manifold along the length of the first header such that the flow passages are formed between the ends of the second distribution plate and the walls of the two end chambers of the manifold, respectively.

3. The heat exchanger of claim 1, wherein the second distribution plate is provided at each end with a slot/hole arrangement, the slot/hole arrangement forming the flow channel.

4. The heat exchanger of claim 2, wherein the distribution structure is T-shaped, the first distribution plate is one-piece, and the first distribution plate is disposed perpendicular to the second distribution plate.

5. The heat exchanger of claim 2, wherein the distribution structure is T-shaped, the first distribution plate having a first plate and a second plate, the first plate, the second plate, and the second distribution plate each being disposed vertically therebetween.

6. The heat exchanger of claim 2, wherein the distribution structure is Y-shaped, the first distribution plate is one-piece and the first distribution plate is arranged in a V-shape, the first distribution plate having a first connection portion, the second distribution plate being connected with the first connection portion to form the distribution structure.

7. The heat exchanger according to claim 2, wherein the distribution structure is arranged in a Y-shape, the first distribution plate has a third plate and a fourth plate, the third plate is connected with the fourth plate, the connected third plate and fourth plate are arranged in a V-shape, the second distribution plate is connected with the third plate and fourth plate to form the distribution structure, and the included angle between the second distribution plate and the third plate and the fourth plate is a, and the included angle a ranges from a > 90 °.

8. The heat exchanger of claim 2, wherein the first distributor plate is one-piece and is arranged in an inverted V-shape, the first distributor plate having a second connection portion, the second distributor plate being connected to the second connection portion to form the distribution structure.

9. The heat exchanger of claim 2, wherein the first distributor plate has a fifth plate and a sixth plate, the fifth plate is connected with the sixth plate, and the connected fifth plate and sixth plate are arranged in an inverted V shape; the second distribution plate is connected with the fifth plate and the sixth plate to form the distribution structure, included angles between the second distribution plate and the fifth plate and included angles between the second distribution plate and the sixth plate are both B, and the range of the included angle B is B < 90 degrees.

10. The heat exchanger of claim 1, wherein the first distribution holes and the second distribution holes are each plural in number, and the plural first distribution holes and the plural second distribution holes are each uniformly distributed at intervals along a length direction of the first distribution plate.