US20220026152A1

US20220026152A1 - Heat Exchanger Flat Tube and Heat Exchanger with Heat Exchanger Flat Tube

Info

Publication number: US20220026152A1
Application number: US17/312,021
Authority: US
Inventors: Wenjian Wei; Wenyong Ma
Original assignee: Zhejiang Dunan Artificial Environment Co Ltd
Current assignee: Zhejiang Dunan Artificial Environment Co Ltd
Priority date: 2018-12-21
Filing date: 2019-10-28
Publication date: 2022-01-27
Also published as: WO2020125205A1; CN111351376A

Abstract

Provided are a heat exchanger flat tube and a heat exchanger with the heat exchanger flat tube. The heat exchanger flat tube includes a first plate body and a second plate body. The second plate body is fastened to the first plate body. A liquid inlet portion, a throttle portion and a fluid channel are provided between the first plate body and the second plate body. The throttle portion is positioned between the liquid inlet portion and the fluid channel. The liquid inlet portion, the throttle portion and the fluid channel are all communicated. Liquid inside the liquid inlet portion is throttled through the throttle portion and flowed into the fluid channel.

Description

CROSS REFERENCE TO RELATED APPLICATION(S)

The present disclosure is a national stage application of International Patent Application No. PCT/CN2019/113740, which is filed on Oct. 28, 2019 and claims priority to Chinese Patent Priority No. 201811574923.2, filed to the National Intellectual Property Administration, PRC on Dec. 21, 2018, entitled “Heat Exchanger Flat Tube and Heat Exchanger with Heat Exchanger Flat Tube”, the disclosure of which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the technical field of heat exchanger flat tubes, and in particular to a heat exchanger flat tube and a heat exchanger with the heat exchanger flat tube.

BACKGROUND

At present, a heat exchanger flat tube in an art known to inventors generally does not have separate liquid inlet portion and liquid outlet portion. Therefore, two ends of the heat exchanger flat tube in the art known to inventors are respectively provided with two collecting tubes, as to respectively deliver a refrigerant into the heat exchanger flat tube or collect the refrigerant. This type of the heat exchanger flat tube in the art is high in cost and large in weight, and mixing of vapor and liquid two phases of the refrigerant is insufficient, so it is not convenient for improving the heat exchange efficiency of the heat exchanger.

SUMMARY

Some embodiments of the present disclosure provide a heat exchanger flat tube and a heat exchanger with the heat exchanger flat tube, as to solve a technical problem in an art known to inventors that the heat exchanger is higher in cost.
According to one aspect of the present disclosure, a heat exchanger flat tube is provided, including a first plate body and a second plate body, the second plate body is fastened to the first plate body. A liquid inlet portion, a throttle portion and a fluid channel are provided between the first plate body and the second plate body. The throttle portion is positioned between the liquid inlet portion and the fluid channel. The liquid inlet portion, the throttle portion and the fluid channel are all communicated. Liquid inside the liquid inlet portion is throttled through the throttle portion and flowed into the fluid channel.
In some embodiments, the throttling portion includes a first shrinkage groove, and the first shrinkage groove is installed on the first plate body, a flow area of the first shrinkage groove is gradually decreased along a flow direction of the liquid.
In some embodiments, the throttling portion further includes a second shrinkage groove, and the second shrinkage groove is installed on the second plate body, wherein the second shrinkage groove is installed opposite to the first shrinkage groove, and a flow area of the second shrinkage groove is gradually decreased along the flow direction of the liquid.
In some embodiments, the liquid inlet portion includes a first protrusion, wherein the first protrusion is installed on the first plate body, the first protrusion is protruded to be installed along a direction away from the second plate body.
In some embodiments, the liquid inlet portion further includes a second protrusion, wherein the second protrusion is installed on the second plate body, the second protrusion is installed opposite to the first protrusion, and the second protrusion is protruded along a direction away from the first plate body.
In some embodiments, the first protrusion and/or the second protrusion is provided with a liquid inlet, so that the liquid is delivered to the liquid inlet portion through the liquid inlet.
In some embodiments, the heat exchanger flat tube further includes a liquid outlet portion between the first plate body and the second plate body, wherein the liquid outlet portion is installed at one end, away from the throttle portion, of the fluid channel, so that a liquid in the fluid channel is discharged through the liquid outlet portion.
In some embodiments, the liquid outlet portion includes a third protrusion, wherein the third protrusion is installed on the first plate body, and the third protrusion is protruded to be installed along a direction away from the second plate body.
In some embodiments, the liquid outlet portion further includes a fourth protrusion, wherein the fourth protrusion is installed on the second plate body, the fourth protrusion is installed opposite to the third protrusion, and the fourth protrusion is protruded to be installed along a direction away from the first plate body.
In some embodiments, the third protrusion and/or the fourth protrusion is provided with a liquid outlet, so that a liquid inside the liquid outlet portion is discharged through the liquid outlet.
In some embodiments, the liquid inlet portion and/or the liquid outlet portion is provided with a plug-in portion, and the plug-in portion is used for connecting with a part to be connected.
In some embodiments, the plug-in portion includes a flange, wherein the flange is installed at a side, away from the second plate body, of the first plate body; and the second plate body is provided with an opening, and the opening is installed corresponding to the flange.
In some embodiments, the fluid channel is internally provided with a turbulence structure, so that a liquid in the fluid channel is turbulated through the turbulence structure.
In some embodiments, the turbulence structure includes a convex hull; the first plate body is provided with the convex hull, the convex hull is protruded to be installed in a direction adjacent to the second plate body; and/or the second plate body is provided with a convex hull, the convex hull is protruded to be installed in a direction adjacent to the first plate body.
In some embodiments, the convex hull includes a truncated cone structure.
According to another aspect of the present disclosure, a heat exchanger is provided, including a plurality of heat exchanger flat tubes, the plurality of heat exchanger flat tubes are installed at intervals, liquid inlet portions of the plurality of heat exchanger flat tubes are all communicated to form a liquid inlet cavity, and the heat exchanger flat tube is the heat exchanger flat tube provided above.
In some embodiments, the heat exchanger flat tube is the heat exchanger flat tube provided above, a plug-in portion of one heat exchanger flat tube in the plurality of heat exchanger flat tubes is inserted into another heat exchanger flat tube in the plurality of heat exchanger flat tubes, so that two neighboring heat exchanger flat tubes in the plurality of heat exchanger flat tubes are connected through the plug-in portion of the heat exchanger flat tube.
A technical scheme of the present disclosure is applied. Because the liquid inlet portion, the throttle portion and the fluid channel are provided between the first plate body and the second plate body, a fluid medium is directly transported into the heat exchanger flat tube through the liquid inlet portion, herein the fluid medium is mainly the refrigerant. Compared with the related art that a collecting tube is required to be installed and the refrigerant is transported into the fluid channel through the collecting tube or the refrigerant in the fluid channel is collected, the heat exchanger in the present disclosure does not need to install the corresponding collecting tube, so that the weight of the heat exchanger is reduced, the charge amount of a refrigerator is decreased, and the cost of the heat exchanger is reduced. In addition, the heat exchanger flat tube in some embodiments of the present disclosure is provided with the throttle portion, a pressure of the refrigerant entering the fluid channel is improved, so mixing of gas-liquid two-phase refrigerants is more uniform, and distributing of the refrigerant between various flat tubes is more uniform, thereby the heat exchange efficiency is improved. Therefore, technical problems in the art known to inventors that the heat exchanger is higher in cost, and uneven in refrigerant distributing or mixing are solved by using the embodiments provided by the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

Drawings of the description for constituting a part of the present disclosure are used to provide further understanding of the present disclosure, and exemplary embodiments of the present disclosure and descriptions thereof are used to explain the present disclosure, and do not constitute improper limitation to the present disclosure. In the drawings:

FIG. 1 shows a structure schematic diagram of a heat exchanger flat tube provided in a first embodiment according to the present disclosure;

FIG. 2 shows a top view of the heat exchanger flat tube provided in the first embodiment according to the present disclosure;

FIG. 3 shows a bottom view of the heat exchanger flat tube provided in the first embodiment according to the present disclosure;

FIG. 4 shows a front view of the heat exchanger flat tube provided in the first embodiment according to the present disclosure;

FIG. 5 shows an A-A view in FIG. 4;

FIG. 6 shows a structure schematic diagram of a first plate body of the heat exchanger flat tube provided in the first embodiment according to the present disclosure;

FIG. 7 shows a structure schematic diagram of a second plate body of the heat exchanger flat tube provided in the first embodiment according to the present disclosure;

FIG. 8 shows a structure schematic diagram of a heat exchanger provided in a second embodiment according to the present disclosure;

FIG. 9 shows a structure schematic diagram from another angle of the heat exchanger provided in the second embodiment according to the present disclosure;

FIG. 10 shows a local structure schematic diagram of the heat exchanger provided in the second embodiment according to the present disclosure; and

FIG. 11 shows a local structure enlarged diagram in FIG. 10.

Herein, the above drawings include the following reference signs:
10, First plate body; 20, Second plate body; 30, Liquid inlet portion; 31, First protrusion; 32, Second protrusion; 33, Liquid inlet portion; 40, Throttle portion; 41, First shrinkage groove; 42, Second shrinkage groove; 50, Fluid channel; 60, Liquid outlet portion; 61, Third protrusion; 62, Fourth protrusion; 63, Liquid outlet; 70, Plug-in portion; 80, Convex hull; 90, Heat exchanger flat tube; 100, Connection tube; 110, Side plate; and 120, Fin.

DETAILED DESCRIPTION OF THE EMBODIMENTS

It should be noted that embodiments in the present disclosure and features in the embodiments may be combined with each other in the case without conflicting. The present disclosure is described in detail below with reference to the drawings and in combination with the embodiments.
As shown in FIG. 1 to FIG. 7, the first embodiment of the present disclosure provides a heat exchanger flat tube 90, the heat exchanger flat tube 90 includes a first plate body 10 and a second plate body 20. The second plate body 20 is fastened to the first plate body 10. A liquid inlet portion 30, a throttle portion 40 and a fluid channel 50 are provided between the first plate body 10 and the second plate body 20. The throttle portion 40 is positioned between the liquid inlet portion 30 and the fluid channel 50. The liquid inlet portion 30, the throttle portion 40 and the fluid channel 50 are all communicated. Liquid inside the liquid inlet portion 30 is throttled through the throttle portion 40 and flowed into the fluid channel 50. Both the first plate body 10 and the second plate body 20 in this embodiment are manufactured by using a stamping forming process. The first plate body 10 and the second plate body 20 are both thin metal plates, and the first plate body 10 and the second plate body 20 in this embodiment are made of an aluminum material or a composite aluminum material. In this embodiment, while the first plate body 10 is installed on the second plate body 20, there is a certain contact surface between the first plate body 10 and the second plate body 20, and the contact surface of the first plate body 10 is welded with a corresponding contact surface on the second plate body 20, as to form the heat exchanger flat tube 90.
In some embodiments of the present disclosure, because the liquid inlet portion 30, the throttle portion 40 and the fluid channel 50 are provided between the first plate body 10 and the second plate body 20, a fluid medium is directly transported into the heat exchanger flat tube 90 through the liquid inlet portion 30, herein the fluid medium is mainly the refrigerant. Compared with the art known to inventors that a collecting tube is required to be installed and the refrigerant is transported into the fluid channel 50 through the collecting tube or the refrigerant in the fluid channel 50 is collected, the heat exchanger in an embodiment of the present disclosure does not need to install the corresponding collecting tube, so that the weight of the heat exchanger is reduced, the charge amount of a refrigerator is decreased, and the cost of the heat exchanger is reduced. In addition, an inlet pressure of the refrigerant is improved after the refrigerant entering the liquid inlet portion 30 is throttled by the throttle portion 40, so mixing of gas-liquid two-phase refrigerants is more uniform, and the refrigerant is conveniently and uniformly distributed to various heat exchanger flat tubes 90 and flowed into the fluid channel 50 through the corresponding throttle portion 40, thereby the heat exchange efficiency is improved. Therefore, a technical problem in the art known to the inventors that the heat exchanger is higher in cost is solved by using the embodiments of the present disclosure.
In some embodiments, the throttle portion 40 includes a first shrinkage groove 41, the first shrinkage groove 41 is installed on the first plate body 10, and a flow area of the first shrinkage groove 41 is gradually decreased along a flow direction of the liquid. Such a configuration is adopted, the refrigerant enters the first shrinkage groove 41 after being flowed from the liquid inlet portion 30. Because the flow area of the first shrinkage groove 41 is gradually decreased, a pressure of the refrigerant flowing into the first shrinkage groove 41 is increased. Correspondingly, the pressure of the refrigerant flowing into the fluid channel 50 is increased, so that the mixing of the gas-liquid two-phase refrigerants is more sufficient.
In order to further improve the throttling effect, in some embodiments, the throttle portion 40 further includes a second shrinkage groove 42. The second shrinkage groove 42 is installed on the second plate body 20, and the second shrinkage groove 42 opposites to the first shrinkage groove 41, and a flow area of the second shrinkage groove 42 is gradually decreased along the flow direction of the liquid. In this way, the refrigerant flows in from the liquid inlet portion 30 and a pressure of the refrigerant is improved under a combined action of the first shrinkage groove 41 and the second shrinkage groove 42, as to further improve the uniformity of the mixing, thereby the heat exchange efficiency is improved.
In some embodiments, the liquid inlet portion 30 includes a first protrusion 31, the first protrusion 31 is installed on the first plate body 10, and the first protrusion 31 is protruded along a direction away from the second plate body 20. Such a configuration is adopted, the first protrusion 31 can receive a certain amount of the refrigerant, so that the refrigerant is transported into the fluid channel 50 through the first protrusion 31.
In order to better deliver the refrigerant into the fluid channel 50 through the liquid inlet portion 30, in some embodiments, the liquid inlet portion 30 further includes a second protrusion 32. The second protrusion 32 is installed on the second plate body 20, the second protrusion 32 is installed opposite to the first protrusion 31, and the second protrusion 32 is protruded along a direction away from the first plate body 10. Such a configuration is adopted, the liquid inlet portion 30 is jointly formed by the first protrusion 31 and the second protrusion 32, as to better deliver the refrigerant to the fluid channel 50. While the heat exchanger flat tube 90 in this embodiment is installed, the first plate body 10 is installed on the second plate body 20, the first protrusion 31 is installed opposite to the second protrusion 32, and a contact surface at the first protrusion 31 and a contact surface at the second protrusion 32 are welded together, so as to form a sealed liquid inlet cavity, so that the refrigerant is delivered to the fluid channel 50 through the liquid inlet cavity.
In some embodiments, a liquid inlet 33 may be installed on the first protrusion 31; or the liquid inlet 33 is installed on the second protrusion 32; or the liquid inlets 33 are simultaneously installed on both the first protrusion 31 and the second protrusion 32. In this embodiment, in order to conveniently transport the fluid medium into the liquid inlet portion 30 through the liquid inlet 33, both the first protrusion 31 and the second protrusion 32 are provided with the liquid inlets 33 respectively.
In order to conveniently discharge the liquid in the fluid channel 50, in some embodiments, there is also a liquid outlet portion 60 between the first plate body 10 and the second plate body 20. The liquid outlet portion 60 is installed at one end, away from the throttle portion 40, of the fluid channel 50, so that liquid inside the fluid channel 50 is discharged through the liquid outlet portion 60, herein the liquid is mainly the refrigerant. Such a configuration is adopted, the refrigerant in the fluid channel 50 is discharged without the need to install a collecting tube connected with each heat exchanger flat tube 90, the weight of the heat exchanger is further reduced, and the charge amount of the refrigerant is also reduced, so the cost of the heat exchanger is further reduced, and a competitive force of a product is improved.
In some embodiments, the liquid outlet portion 60 includes a third protrusion 61, the third protrusion 61 is installed on the first plate body 10, and the third protrusion 61 is protruded along the direction away from the second plate body 20. There is a certain accommodating space between the third protrusion 61 and the second plate body 20, and the accommodating space is used to accommodate the refrigerant to be discharged, so that the refrigerant is discharged through the third protrusion 61.
In order to better discharge the refrigerant in the fluid channel 50 by the liquid outlet portion 60, in some embodiments, the liquid outlet portion 60 further includes a fourth protrusion 62, the fourth protrusion 62 is installed on the second plate body 20, the fourth protrusion 62 is installed opposite to the third protrusion 61, and the fourth protrusion 62 is protruded along the direction away from the first plate body 10. The liquid outlet portion 60 is jointly formed by the third protrusion 61 and the fourth protrusion 62, so that the refrigerant in the fluid channel 50 is discharged better. While the heat exchanger flat tube 90 in this embodiment is installed, the first plate body 10 is installed on the second plate body 20, the third protrusion 61 is installed opposite to the fourth protrusion 62, and a contact surface at the third protrusion 61 and a contact surface at the fourth protrusion 62 are welded together, as to form a sealed liquid outlet cavity, so that the refrigerant is discharged through the liquid outlet cavity.
In some embodiments, a liquid outlet 63 is installed on the third protrusion 61; or a liquid outlet 63 is installed on the fourth protrusion 62; or both the third protrusion 61 and the fourth protrusion 62 are respectively provided with a liquid outlet 63. In this embodiment, in order to conveniently install and connect, the third protrusion 61 and the fourth protrusion 62 are respectively provided with the liquid outlet 63, so that the liquid in the liquid outlet portion 60 is discharged through the liquid outlets 63.
In some embodiments, a plug-in portion 70 is installed on the liquid inlet portion 30; or a plug-in portion 70 is installed on the liquid outlet portion 60; or both the liquid inlet portion 30 and the liquid outlet portion 60 are respectively provided with plug-in portions 70. The plug-in portion 70 is used to connect with a part to be connected. In an embodiment, the part to be connected here is the other heat exchanger flat tube 90. In order to conveniently connect multiple heat exchanger flat tubes 90, both the liquid inlet portion 30 and the liquid outlet portion 60 are provided with the plug-in portions 70, and the plug-in portion 70 is used for inserting into another heat exchanger flat tube 90, so the multiple heat exchanger flat tubes 90 are superposed through the plug-in portions 70, and welded. The heat exchanger flat tube 90 in this embodiment is adopted, the collecting tube in the related technology is eliminated, the installation is convenient, and the cost is reduced.
In some embodiments, the plug-in portion 70 is a flange, and the flange is installed at one side, away from the second plate body 20, of the first plate body 10. Correspondingly, an opening is installed on the second plate body 20, and the opening is installed corresponding to the flange. While the heat exchanger is installed, the flange on one heat exchanger flat tube 90 is inserted into the opening on another heat exchanger flat tube 90, and corresponding contact end faces are braze-welded, as to achieve sealing. In some embodiments, the liquid inlet 33 and the liquid outlet 63 are used to form the opening. On the one hand, it is convenient for liquid inlet or outlet, and on the other hand, it is also convenient for connecting, and improving overall stability of a device.
In order to further improve the heat exchange effect, in some embodiments, the fluid channel 50 is internally provided with a turbulence structure, as to turbulate the liquid in the fluid channel 50 through the turbulence structure, so that the heat exchange effect of the refrigerant is improved by turbulence.
In some embodiments, the turbulence structure includes a convex hull 80. The convex hull 80 is installed on the first plate body 10, and the convex hull 80 is protruded to be installed in a direction adjacent to the second plate body 20; or, a convex hull 80 is installed on the second plate body 20, and the convex hull 80 is protruded to be installed in a direction adjacent to the first plate body; or, a convex hull 80 is installed on the first plate body 10, and the convex hull 80 on the first plate body 10 is protruded to be installed in the direction adjacent to the second plate body 20, at the same time a convex hull 80 is installed on the second plate body 20, and the convex hull 80 on the second plate body 20 is protruded to be installed in the direction adjacent to the first plate body 10. In order to further improve the heat exchange effect, in an embodiment, the convex hull 80 is installed on the first plate body 10, and the convex hull 80 on the first plate body 10 is protruded to be installed in the direction adjacent to the second plate body 20, at the same time another convex hull 80 is installed on the second plate body 20, and the convex hull 80 on the second plate body 20 is protruded to be installed in the direction adjacent to the first plate body 10, so that the refrigerant in the fluid channel 50 is turbulated through the convex hull 80 on the first plate body 10 and the convex hull 80 on the second plate body 20. In some embodiments, in order to further improve a turbulence effect, while the first plate body 10 is installed on the second plate body 20, the convex hull 80 on the first plate body 10 is abutted against the convex hull 80 on the second plate body 20, and an abutment place of the first plate body 10 and the second plate body 20 is welded, so that the refrigerant in the fluid channel 50 is flowed around a side wall of the convex hull 80 of the first plate body 10 and a side wall of the convex hull 80 of the second plate body 20.
In some embodiments, the convex hull 80 is a truncated cone structure. While the refrigerant is flowed in the fluid channel 50, the refrigerant is flowed around a side wall of the truncated cone structure after meeting the convex hull 80, so that the refrigerant is turbulated, thereby the heat exchange effect is improved. The convex hull 80 may also be a circular truncated cone structure or other shapes with equivalent functions.
As shown in FIG. 8 to FIG. 11, a second embodiment of the present disclosure provides a heat exchanger, the heat exchanger includes multiple heat exchanger flat tubes 90, the multiple heat exchanger flat tubes 90 are installed at intervals, and liquid inlet portions of the multiple heat exchanger flat tubes 90 are all communicated to form a liquid inlet cavity, and the heat exchanger flat tube 90 is the heat exchanger flat tube 90 in the first embodiment. An arrow direction in FIG. 11 is the flow direction of the refrigerant.
In some embodiments, each of the multiple heat exchanger flat tubes 90 includes a plug-in portion 70, and the plug-in portion 70 of one heat exchanger flat tube 90 in the multiple heat exchanger flat tubes 90 is inserted into another heat exchanger flat tube 90 in the multiple heat exchanger flat tubes 90, so that two neighboring heat exchanger flat tubes 90 are connected through the plug-in portion 70 of the heat exchanger flat tube 90. Such a configuration is adopted, the heat exchanger does not need to be provided with an additional collecting tube, only the liquid inlet portions 30 and the liquid outlet portions 60 of the multiple heat exchanger flat tubes 90 are respectively superposed and connected, the cost is reduced, and an installation process is simplified.
In some embodiments, the heat exchanger also includes a connection tube 100. After the multiple heat exchanger flat tubes 90 are connected and installed, only one connection tube 100 needs to be respectively connected with the liquid inlet portion 30 and the liquid outlet portion 60 of the heat exchanger flat tube 90 at an end portion, the refrigerant is fed into the liquid inlet portions 30 and the refrigerant in the liquid outlet portions 60 is discharged through the connection tube 100. While the heat exchanger in this embodiment is worked, the refrigerant enters the liquid inlet portion 30 of each heat exchanger flat tube 90 through one connection tube 100, and enters the corresponding fluid channel 50 through each liquid inlet portion 30, and then flows into another connection tube 100 from the corresponding liquid outlet portion 60. In some embodiments, the heat exchanger further includes a side plate 110 and a fin 120. The side plate 110 is installed near the heat exchanger flat tube 90 at the end portion, and the fin 120 is positioned between two neighboring heat exchanger flat tubes 90.
It may be seen from the above descriptions that the above embodiments of the present disclosure achieve the following technical effects: the refrigerant may be conveniently fed or discharged by installing the liquid inlet portion and the liquid outlet portion at the end portion of the heat exchanger, the corresponding collecting tube does not need to be installed, a material of the heat exchanger flat tube is saved, the cost of the heat exchanger flat tube is reduced, and a volume of the heat exchanger flat tube is reduced; and the heat exchanger flat tube is provided with the throttle portion, the inlet pressure of the refrigerant is improved, so the mixing of the gas-liquid two-phase refrigerants is more sufficient, it is convenient for liquid distribution of the heat exchanger flat tube, and the heat exchange effect is improved. At the same time, an installation mode of the heat exchanger in the present disclosure is simple and the assembly is convenient.
The above are only preferred embodiments of the present disclosure, and are not used to limit the present disclosure. Various modifications and changes may be made to the present disclosure by those skilled in the art. Any modifications, equivalent replacements, improvements and the like made within the spirit and principle of the present disclosure shall be included in a scope of protection of the present disclosure.

Claims

What is claimed is:

1. A heat exchanger flat tube, comprising a first plate body and a second plate body, the second plate body is fastened to the first plate body, a liquid inlet portion, a throttle portion and a fluid channel are provided between the first plate body and the second plate body, the throttle portion is positioned between the liquid inlet portion and the fluid channel, the liquid inlet portion, the throttle portion and the fluid channel are all communicated, liquid inside the liquid inlet portion is throttled through the throttle portion and flowed into the fluid channel.

2. The heat exchanger flat tube according to claim 1, wherein the throttling portion comprises a first shrinkage groove installed on the first plate body, wherein a flow area of the first shrinkage groove is gradually decreased along a flow direction of the liquid.

3. The heat exchanger flat tube according to claim 2, wherein the throttling portion further comprises a second shrinkage groove installed on the second plate body, wherein the second shrinkage groove is installed opposite to the first shrinkage groove, and a flow area of the second shrinkage groove is gradually decreased along the flow direction of the liquid.

4. The heat exchanger flat tube according to claim 1, wherein the liquid inlet portion comprises a first protrusion, wherein the first protrusion is installed on the first plate body, the first protrusion is protruded to be installed along a direction away from the second plate body.

5. The heat exchanger flat tube according to claim 4, wherein the liquid inlet portion further comprises a second protrusion, wherein the second protrusion is installed on the second plate body, the second protrusion is installed opposite to the first protrusion, and the second protrusion is protruded along a direction away from the first plate body.

6. The heat exchanger flat tube according to claim 5, wherein the first protrusion and/or the second protrusion is provided with a liquid inlet, so that the liquid is delivered to the liquid inlet portion through the liquid inlet.

7. The heat exchanger flat tube according to claim 1, wherein the heat exchanger flat tube further comprises a liquid outlet portion between the first plate body and the second plate body, wherein the liquid outlet portion is installed at an end, away from the throttle portion, of the fluid channel, so that a liquid in the fluid channel is discharged through the liquid outlet portion.

8. The heat exchanger flat tube according to claim 7, wherein the liquid outlet portion comprises a third protrusion, wherein the third protrusion is installed on the first plate body, and the third protrusion is protruded to be installed along a direction away from the second plate body.

9. The heat exchanger flat tube according to claim 8, wherein the liquid outlet portion further comprises a fourth protrusion, wherein the fourth protrusion is installed on the second plate body, the fourth protrusion is installed opposite to the third protrusion, and the fourth protrusion is protruded to be installed along a direction away from the first plate body.

10. The heat exchanger flat tube according to claim 9, wherein the third protrusion and/or the fourth protrusion is provided with a liquid outlet, so that a liquid inside the liquid outlet portion is discharged through the liquid outlet.

11. The heat exchanger flat tube according to claim 7, wherein the liquid inlet portion and/or the liquid outlet portion is provided with a plug-in portion, and the plug-in portion is used for connecting with a part to be connected.

12. The heat exchanger flat tube according to claim 11, wherein the plug-in portion comprises a flange, wherein the flange is installed at a side, away from the second plate body, of the first plate body; and the second plate body is provided with an opening, and the opening is installed corresponding to the flange.

13. The heat exchanger flat tube according to claim 1, wherein the fluid channel is internally provided with a turbulence structure, so that a liquid in the fluid channel is turbulated through the turbulence structure.

14. The heat exchanger flat tube according to claim 13, wherein the turbulence structure comprises a convex hull; wherein

the first plate body is provided with the convex hull, the convex hull is protruded to be installed in a direction adjacent to the second plate body; and/or

the second plate body is provided with the convex hull, the convex hull is protruded to be installed in a direction adjacent to the first plate body.

15. The heat exchanger flat tube according to claim 14, wherein the convex hull comprises a truncated cone structure.

16. A heat exchanger, comprising a plurality of heat exchanger flat tubes, the plurality of heat exchanger flat tubes are installed at intervals, liquid inlet portions of the plurality of heat exchanger flat tubes are all communicated to form a liquid inlet cavity, and the heat exchanger flat tube is the heat exchanger flat tube according to claim 1.

17. The heat exchanger according to claim 16, wherein the heat exchanger flat tube is the heat exchanger flat tube in claim 11, and a plug-in portion of one heat exchanger flat tube in the plurality of heat exchanger flat tubes is inserted into another heat exchanger flat tube in the plurality of heat exchanger flat tubes, so that two neighboring heat exchanger flat tubes in the plurality of heat exchanger flat tubes are connected through the plug-in portion of the heat exchanger flat tube.

18. The heat exchanger according to claim 16, wherein the throttling portion comprises a first shrinkage groove installed on the first plate body, wherein a flow area of the first shrinkage groove is gradually decreased along a flow direction of the liquid.

19. The heat exchanger according to claim 18, wherein the throttling portion further comprises a second shrinkage groove installed on the second plate body, wherein the second shrinkage groove is installed opposite to the first shrinkage groove, and a flow area of the second shrinkage groove is gradually decreased along the flow direction of the liquid.

20. The heat exchanger according to claim 16, wherein the liquid inlet portion comprises a first protrusion, wherein the first protrusion is installed on the first plate body, the first protrusion is protruded to be installed along a direction away from the second plate body.