CN210425643U

CN210425643U - Microchannel heat exchanger and heat pump system

Info

Publication number: CN210425643U
Application number: CN201921540154.4U
Authority: CN
Inventors: 孙腾; 张潘鑫; 吴迎文; 杨瑞琦; 王凯
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-09-16
Filing date: 2019-09-16
Publication date: 2020-04-28
Anticipated expiration: 2029-09-16

Abstract

The application provides a microchannel heat exchanger and a heat pump system. This microchannel heat exchanger includes first pressure manifold (1), second pressure manifold (2) and flat pipe (3), and flat pipe (3) are connected between first pressure manifold (1) and second pressure manifold (2), are provided with a plurality of isolating construction along axial interval on second pressure manifold (2), and isolating construction is used for separating second pressure manifold (2) for a plurality of lumen (5) isolated tube sections (4), all is connected with refrigerant on each tube section (4) and takes over (6). According to the micro-channel heat exchanger and the heat pump system, the refrigerant distribution condition of the heat exchanger under the condition that the number of the flat pipes is large can be effectively improved, and the heat exchange performance of the heat exchanger is improved.

Description

Microchannel heat exchanger and heat pump system

Technical Field

The application relates to the technical field of air conditioning, in particular to a micro-channel heat exchanger and a heat pump system.

Background

When the microchannel heat exchanger is used as an evaporator, an inlet is generally in a gas-liquid two-phase state, a collecting pipe of the traditional microchannel heat exchanger has no flow dividing measure, and the gas-liquid two-phase layering phenomenon is obvious after the gas-liquid two-phase layering phenomenon enters the collecting pipe, so that the refrigerant entering the flat pipe is unevenly distributed, and the heat exchange performance of the heat exchanger is poor.

In the prior art, a flat tube is inserted into an inlet portion of a liquid header, so that the pressure in a refrigerant flow channel in the liquid header is reduced, and a refrigerant flow path is added outside the liquid header, so that the refrigerant in the liquid header circularly flows.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem that this application will be solved lies in providing a microchannel heat exchanger and heat pump system, can effectively improve the refrigerant distribution situation of heat exchanger under the more condition of flat tub figure, improves the heat transfer performance of heat exchanger.

In order to solve the problem, the application provides a microchannel heat exchanger, including first pressure manifold, second pressure manifold and flat pipe, flat union coupling is between first pressure manifold and second pressure manifold, is provided with a plurality of isolating structure along the axial interval on the second pressure manifold, and isolating structure is used for separating the second pressure manifold for the isolated pipeline section of a plurality of lumens, all is connected with the refrigerant on each pipeline section and takes over.

Preferably, a communication pipe is arranged outside at least one pipe section, a first end of the communication pipe is communicated with a first end of the pipe section, and a second end of the communication pipe is communicated with a second end of the pipe section.

Preferably, the isolation structure comprises an isolation block, the structure of the isolation block is matched with the second collecting pipe, a plurality of mounting grooves are formed in the second collecting pipe, and the isolation block is arranged in the mounting grooves.

Preferably, the spacing block includes sealing portion and embedding part, and the hookup location department of sealing portion and embedding part forms the backstop step, and the mounting groove is the semicircle groove, and the embedding part embedding is in the second collector pipe, and the sealing portion embedding is in the semicircle inslot, and backstop step backstop is on the both ends lateral wall in semicircle groove, and sealing portion and embedding part mutually support, separate the lumen of spacing block both sides.

Preferably, the isolating block comprises a connecting hole and a through hole which are communicated with each other, the refrigerant connecting pipe is connected to the connecting hole, and the through hole is communicated with the tube cavity.

Preferably, the through-flow hole is an L-shaped hole, one end of the L-shaped hole is communicated with the connecting hole, the other end of the L-shaped hole is communicated with the tube cavity, and the sectional area of the connecting hole is larger than that of the through-flow hole.

Preferably, the isolation structure comprises a sealing plate and a throttle plate, a throttle hole is formed in the throttle plate, a flow guide cavity is formed between the sealing plate and the throttle plate, the refrigerant connecting pipe is communicated with the flow guide cavity, the flow guide cavity is communicated with the pipe cavity through the throttle plate, and the flow guide cavity is separated from the adjacent pipe section through the sealing plate.

Preferably, the second collecting pipe is provided with a mounting groove, and the sealing plate and the throttle plate are embedded in the mounting groove.

Preferably, the first collecting pipe and the second collecting pipe are vertically arranged, and the refrigerant connecting pipe is connected to the bottom of the pipe section.

Preferably, the microchannel heat exchanger is a single-row heat exchanger, a double-row heat exchanger, or a multi-row heat exchanger.

According to an embodiment of the application, the heat pump system comprises a microchannel heat exchanger, and the microchannel heat exchanger is the microchannel heat exchanger.

Preferably, the heat pump system further comprises a compressor, a first heat exchanger, a throttling device and a flow divider which are sequentially connected, wherein the flow divider comprises a plurality of flow dividing interfaces, and the flow dividing interfaces are connected with the refrigerant connecting pipes in a one-to-one correspondence manner.

The utility model provides a microchannel heat exchanger, including first pressure manifold, second pressure manifold and flat pipe, flat union coupling is between first pressure manifold and second pressure manifold, is provided with a plurality of isolation structures along axial interval on the second pressure manifold, and isolation structure is used for separating the second pressure manifold for the isolated pipeline section of a plurality of lumens, all is connected with the refrigerant on each pipeline section and takes over. The utility model provides a microchannel heat exchanger adopts isolation structure to separate the second pressure manifold for the isolated pipeline section of a plurality of lumens, when flat tub of figure is more, can divide a plurality of flat pipes into a plurality of refrigerant flow regions through the pipeline section of isolation, reduces the flow of refrigerant in every pipeline section for the refrigerant all can realize evenly distributed in every pipeline section, effectively improves the phenomenon of the two-phase layering of gas-liquid, improves the heat exchanger performance.

Drawings

Fig. 1 is a schematic perspective view of a microchannel heat exchanger according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of a microchannel heat exchanger according to a first embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of a microchannel heat exchanger according to a first embodiment of the present application;

FIG. 4 is an enlarged schematic view of a tube section of a microchannel heat exchanger according to a first embodiment of the present application;

FIG. 5 is a schematic perspective view of a spacer block of a microchannel heat exchanger according to a first embodiment of the present application;

FIG. 6 is a cross-sectional view of a spacer block of a microchannel heat exchanger according to a first embodiment of the present application;

FIG. 7 is a schematic cross-sectional view of a microchannel heat exchanger according to a second embodiment of the present application;

FIG. 8 is a schematic cross-sectional view of a microchannel heat exchanger according to a second embodiment of the present application;

FIG. 9 is an enlarged schematic view of a tube section of a microchannel heat exchanger according to a second embodiment of the present application;

FIG. 10 is a schematic perspective view of a throttle plate of a microchannel heat exchanger according to a first embodiment of the present application;

fig. 11 is a schematic perspective view of a sealing plate of a microchannel heat exchanger according to a first embodiment of the present application;

FIG. 12 is a schematic perspective view of a dual row microchannel heat exchanger according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a heat pump system according to an embodiment of the present application.

The reference numerals are represented as:

1. a first header; 2. a second header; 3. flat tubes; 4. a pipe section; 5. a lumen; 6. a refrigerant connecting pipe; 7. a communicating pipe; 8. an isolation block; 9. mounting grooves; 10. a sealing part; 11. an insertion section; 12. a stopping step; 13. connecting holes; 14. a through-flow aperture; 15. closing the plate; 16. a throttle plate; 17. an orifice; 18. a flow guide cavity; 19. a microchannel heat exchanger; 20. a compressor; 21. a first heat exchanger; 22. a throttling device; 23. a flow divider; 24. and a four-way valve.

Detailed Description

Referring to fig. 1 to 13 in combination, according to an embodiment of the present application, a microchannel heat exchanger includes a first collecting pipe 1, a second collecting pipe 2, and flat pipes 3, the flat pipes 3 are connected between the first collecting pipe 1 and the second collecting pipe 2, the second collecting pipe 2 is provided with a plurality of isolation structures at intervals along an axial direction, the isolation structures are used for dividing the second collecting pipe 2 into pipe sections 4 separated by a plurality of pipe cavities 5, and each pipe section 4 is connected with a refrigerant connecting pipe 6.

The utility model provides a microchannel heat exchanger, adopt isolation structure to separate second pressure manifold 2 for the isolated pipeline section 4 of a plurality of lumens 5, when flat pipe 3 figure is more, can divide a plurality of flat pipe 3 into a plurality of refrigerant flow regions through the pipeline section 4 of isolation, form a plurality of parallelly connected flow paths, reduce the flow of refrigerant in every pipeline section 4, make the refrigerant all can realize evenly distributed in every pipeline section 4, effectively improve the phenomenon of the double-phase layering of gas-liquid, improve the heat exchanger performance.

The first collecting pipe 1 and the second collecting pipe 2 are vertically arranged, and the refrigerant connecting pipe 6 is connected to the bottom of the pipe section 4.

A communication pipe 7 is arranged outside at least one pipe section 4, a first end of the communication pipe 7 is communicated with a first end of the pipe section 4, and a second end of the communication pipe 7 is communicated with a second end of the pipe section 4. For the pipe segment 4 provided with the communication pipe 7, the communication pipe 7 outside the pipe segment 4 can be used to make the refrigerant in the flow path where the pipe segment 4 is located form a circulating flow, and the refrigerant entering each flat pipe 3 corresponding to the pipe segment 4 is distributed more uniformly.

Preferably, each pipe section 4 is externally provided with a communicating pipe 7, so that each pipe section can form a circulating refrigerant flow, the flat pipe of the whole micro-channel heat exchanger can be ensured to realize uniform distribution of the refrigerant, and the heat exchange performance of the heat exchanger is improved to the greatest extent.

In this embodiment, the microchannel heat exchanger includes that each refrigerant of N takes over 6, N communicating pipe 7, a N isolating construction, a first pressure manifold 1, a second pressure manifold 2, a flat pipe 3 of M, sets up the end cover at pressure manifold both ends and is located the fin between the adjacent flat pipe 3. Wherein N isolation structure bar second pressure manifold 2 divide into N independent lumen 5, and every isolation structure is connected with a refrigerant and takes over 6, and every lumen 5 is connected with a communicating pipe 7, and every communicating pipe 7 communicates the upper and lower part of the pipeline section 4 that this communicating pipe 7 belongs to.

Referring to fig. 2 to 6 in combination, according to the first embodiment of the present application, the isolation structure includes an isolation block 8, the structure of the isolation block 8 is adapted to the second collecting pipe 2, the second collecting pipe 2 is provided with a plurality of mounting grooves 9, and the isolation block 8 is disposed in the mounting grooves 9. Through setting up mounting groove 9, can conveniently install spacing block 8 on second pressure manifold 2 to separate into a plurality of pipeline sections 4 with second pressure manifold 2 effectively, realize that the structure is simple and convenient more. The mounting groove 9 of the isolating block 8 and the second collecting pipe 2 can be in interference fit, so that the connecting structure between the isolating block 8 and the mounting groove 9 can be stable and reliable, and the isolating block 8 and the second collecting pipe 2 can be more conveniently in sealing fit by utilizing interference fit. Preferably, in order to further improve the sealing performance between the isolation block 8 and the second header 2, a sealing glue may be used to seal between the isolation block 8 and the mounting groove 9.

In this embodiment, the isolation block 8 includes a sealing portion 10 and an embedding portion 11, a stopping step 12 is formed at a connection position of the sealing portion 10 and the embedding portion 11, the mounting groove 9 is a semicircular groove, the embedding portion 11 is embedded in the second header 2, the sealing portion 10 is embedded in the semicircular groove, the stopping step 12 is stopped on two end side walls in the circumferential direction of the semicircular groove, and the sealing portion 10 and the embedding portion 11 are matched with each other to separate the tube cavities 5 on two sides of the isolation block 8. The section of embedding portion 11 and the section of sealing 10 are semi-circular, and the radius of embedding portion 11 is the same with the inner chamber radius of second pressure manifold 2 to can guarantee that embedding portion 11 can be smoothly packed into in second pressure manifold 2 from the semi-circular inslot, and make embedding portion 11 can laminate on the inner wall of second pressure manifold 2, realize with the sealed cooperation between the inner wall of second pressure manifold 2. The radius of sealing 10 is the same with the external diameter of second pressure manifold 2, can guarantee that sealing 10 and the both sides cell wall in semicircular groove laminate each other, and can flush with the outer wall of second pressure manifold 2 to form good appearance structure, and conveniently utilize the backstop step that forms between sealing 10 and the embedding portion 11 to realize the sealed cooperation between spacing block 8 and the second pressure manifold 2. Here, the semicircular groove means that the mounting groove 9 is semicircular on the outer surface of the second header 2, and the projection of the mounting groove 9 in the radial direction is rectangular.

Preferably, the isolation block 8 comprises a connecting hole 13 and a through hole 14 which are communicated with each other, the refrigerant connecting pipe 6 is connected to the connecting hole 13, and the through hole 14 is communicated with the tube cavity 5. Through set up connecting hole 13 and through-flow hole 14 on spacing block 8, can enough conveniently carry out the installation of refrigerant takeover 6 fixed, can conveniently realize the intercommunication of refrigerant takeover 6 and lumen 5 again.

In this embodiment, the through-flow hole 14 is the L shape hole, the one end in L shape hole communicates with connecting hole 13, the other end in L shape hole and lumen 5 intercommunication, the sectional area of connecting hole 13 is greater than the sectional area of through-flow hole 14 to can form the stair structure, so, at the in-process of installing, refrigerant takeover 6 just can the backstop on the stair structure, can enough form the backstop location to the installation of refrigerant takeover 6, can also avoid refrigerant takeover 6 direct and pipe wall contact to lead to the mouth of pipe of refrigerant takeover 6 to be stifled. The aperture of the connecting hole 13 is larger than that of the through-flow hole 14, so that after entering the L-shaped through-flow hole 14, the refrigerant can be accelerated, the flowing speed of the refrigerant is improved, and the bending structure of the L-shaped through-flow hole 14 can enable the refrigerant entering the L-shaped through-flow hole 14 to turn when entering the bending position, so that the refrigerant flows out from the L-shaped through-flow hole 14 in the same direction as the axial direction of the pipe section 4, and the flowing effect of the refrigerant is improved.

Fig. 4 is a schematic view showing the flow of the refrigerant in each tube cavity 5 of the second header 2 when the microchannel heat exchanger of the first embodiment is used as an evaporator. The gas-liquid two-phase refrigerant enters the isolating block 8 from the refrigerant connecting pipe 6, and is accelerated and deflected by the isolating block 8 to be upwards sprayed into the pipe cavity 5, the pressure of the lower end pipe orifice of the communicating pipe 7 is lower than that of the upper end pipe orifice due to the injection effect of the high-speed refrigerant, so that the refrigerant entering the pipe cavity 5 is divided into two parts, one part of the refrigerant enters the flat pipe 3, the other part of the refrigerant enters the communicating pipe 7 from the upper end pipe orifice of the communicating pipe 7 and then returns to the pipe cavity 5 from the lower end pipe orifice of the communicating pipe 7 to form circulating flow, the circulating flow kinetic energy enables the gas-phase refrigerant above the pipe cavity 5 to return to the lower part to be mixed with the two-phase refrigerant, the two-phase refrigerant in the.

Referring to fig. 7 to 11 in combination, the second embodiment of the present application is substantially the same as the first embodiment, except that in this embodiment, the isolation structure includes a sealing plate 15 and a throttle plate 16, a throttle hole 17 is formed in the throttle plate 16, a diversion cavity 18 is formed between the sealing plate 15 and the throttle plate 16, the refrigerant connection pipe 6 is communicated with the diversion cavity 18, the diversion cavity 18 is communicated with the pipe cavity 5 through the throttle plate 16, and the diversion cavity 18 is separated from the adjacent pipe segment 4 through the sealing plate 15.

In this embodiment, the number of the throttle plates 16 is N, each throttle plate 16 is provided with a throttle hole 17, and the throttle holes 17 can accelerate the refrigerant entering the pipe cavity 5 from the flow guide cavity 18 of the second header 2, so as to improve the refrigerant injection effect and further improve the uniform distribution effect of the refrigerant. The closing plate 15 is of a non-porous structure and plays a role of separating two adjacent pipe sections 4.

The section structures of the closing plate 15 and the throttle plate 16 are basically the same as the section structure of the isolating block 8, and are the combination of two semicircles with different diameters, so that the sealing connection and fixation between the second collecting pipes 2 can be conveniently realized.

The second collecting pipe 2 is provided with a mounting groove 9, and the sealing plate 15 and the throttle plate 16 are embedded in the mounting groove 9.

Fig. 9 is a schematic diagram illustrating the flow of the refrigerant in the respective tube cavities 5 and the diversion cavity 18 of the second header 2 when the microchannel heat exchanger of the second embodiment is used as an evaporator. Gas-liquid two-phase refrigerant enters the flow guide cavity 18 from the refrigerant connecting pipe 6, the refrigerant is accelerated through the throttling hole 17 and then upwards sprayed into the pipe cavity 5, the pressure of the lower end pipe orifice of the communicating pipe 7 is lower than that of the upper end pipe orifice due to the injection effect of the high-speed refrigerant, the refrigerant entering the pipe cavity 5 is divided into two parts, one part of the refrigerant enters the flat pipe 3, the other part of the refrigerant enters the communicating pipe 7 from the upper end pipe orifice of the communicating pipe 7 and then returns to the pipe cavity 5 from the lower end pipe orifice of the communicating pipe 7, circulation flow is formed, the circulation flow kinetic energy enables gas-phase refrigerant above the pipe cavity 5 to return to the lower part to be mixed with the two-phase refrigerant, the two-phase refrigerant in the.

The microchannel heat exchanger can be a single-row heat exchanger, a double-row heat exchanger or a multi-row heat exchanger, and can be selected according to the requirement.

Referring collectively to fig. 13, in accordance with an embodiment of the present application, a heat pump system includes a microchannel heat exchanger 19, the microchannel heat exchanger 19 being the microchannel heat exchanger described above.

The heat pump system further comprises a compressor 20, a first heat exchanger 21, a throttling device 22 and a flow divider 23 which are sequentially connected, wherein the flow divider 23 comprises a plurality of flow dividing interfaces, and the flow dividing interfaces are connected with the refrigerant connecting pipes 6 in a one-to-one correspondence manner.

A four-way valve 24 is also provided at the discharge end of the compressor 20.

When the microchannel heat exchanger is used as a condenser, a of the four-way valve 24 is communicated with b, c is communicated with d, a refrigerant discharged from the compressor 20 passes through the four-way valve 24, then enters the microchannel heat exchanger 19 from a connecting pipe of the first collecting pipe 1 for condensation and heat release, then flows out through the N refrigerant connecting pipes 6, enters the throttling device 22 for throttling after being converged by the flow divider 23, then enters the first heat exchanger 21 for evaporation and heat absorption, and then returns to the compressor 20 through the four-way valve 24, so that the circulation is completed.

When the microchannel heat exchanger is used as an evaporator, ac and bd of the four-way valve 24 are communicated, a refrigerant discharged from the compressor 20 enters the first heat exchanger 21 through the four-way valve 24 to be condensed and released heat, then enters the throttling device 22 to be throttled, then is divided into N paths through the flow divider 23, then enters the microchannel heat exchanger 19 through the N refrigerant connecting pipes 6 to be evaporated and absorbed heat, then flows out from the connecting pipe of the first collecting pipe 1, and finally returns to the compressor 20 through the four-way valve 24 to finish circulation.

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

1. The utility model provides a microchannel heat exchanger, its characterized in that, includes first pressure manifold (1), second pressure manifold (2) and flat pipe (3), flat pipe (3) are connected first pressure manifold (1) with between second pressure manifold (2), be provided with a plurality of isolating construction along the axial interval on second pressure manifold (2), isolating construction is used for with second pressure manifold (2) are separated for isolated tube segments (4) of a plurality of lumens (5), each all be connected with refrigerant on tube segment (4) and take over (6).

2. The microchannel heat exchanger according to claim 1, wherein a communication pipe (7) is arranged outside at least one of the tube sections (4), a first end of the communication pipe (7) is communicated with a first end of the tube section (4), and a second end of the communication pipe (7) is communicated with a second end of the tube section (4).

3. The micro-channel heat exchanger according to claim 1, wherein the isolation structure comprises an isolation block (8), the structure of the isolation block (8) is matched with that of the second collecting pipe (2), a plurality of mounting grooves (9) are formed in the second collecting pipe (2), and the isolation block (8) is arranged in the mounting grooves (9).

4. The micro-channel heat exchanger according to claim 3, wherein the isolation block (8) comprises a sealing part (10) and an embedding part (11), a stopping step (12) is formed at the connecting position of the sealing part (10) and the embedding part (11), the mounting groove (9) is a semi-circular groove, the embedding part (11) is embedded in the second collecting pipe (2), the sealing part (10) is embedded in the semi-circular groove, the stopping step (12) is stopped on the side walls of two ends of the semi-circular groove, and the sealing part (10) and the embedding part (11) are matched with each other to separate the pipe cavities (5) on two sides of the isolation block (8).

5. The micro-channel heat exchanger according to claim 3, wherein the spacer block (8) comprises a connecting hole (13) and a through hole (14) which are communicated with each other, the refrigerant connecting pipe (6) is connected to the connecting hole (13), and the through hole (14) is communicated with the tube cavity (5).

6. The micro-channel heat exchanger according to claim 5, wherein the through-flow hole (14) is an L-shaped hole having one end communicating with the connection hole (13) and the other end communicating with the tube chamber (5), and a sectional area of the connection hole (13) is larger than a sectional area of the through-flow hole (14).

7. The microchannel heat exchanger according to claim 1, wherein the isolation structure comprises a sealing plate (15) and a throttle plate (16), a throttle hole (17) is formed in the throttle plate (16), a flow guide cavity (18) is formed between the sealing plate (15) and the throttle plate (16), the refrigerant connection pipe (6) is communicated with the flow guide cavity (18), the flow guide cavity (18) is communicated with the pipe cavity (5) through the throttle plate (16), and the flow guide cavity (18) is separated from the adjacent pipe section (4) through the sealing plate (15).

8. The micro-channel heat exchanger according to claim 7, wherein the second header (2) is provided with a mounting groove (9), and the sealing plate (15) and the throttle plate (16) are embedded in the mounting groove (9).

9. The micro-channel heat exchanger according to claim 1, wherein the first collecting pipe (1) and the second collecting pipe (2) are vertically arranged, and the refrigerant connecting pipe (6) is connected to the bottom of the pipe section (4).

10. The microchannel heat exchanger of claim 1, wherein the microchannel heat exchanger is a single-row heat exchanger, a dual-row heat exchanger, or a multi-row heat exchanger.

11. A heat pump system comprising a microchannel heat exchanger (19), wherein the microchannel heat exchanger (19) is the microchannel heat exchanger of any one of claims 1 to 10.

12. The heat pump system according to claim 11, further comprising a compressor (20), a first heat exchanger (21), a throttling device (22) and a flow divider (23) connected in sequence, wherein the flow divider (23) comprises a plurality of flow dividing interfaces, and the flow dividing interfaces are connected with the refrigerant connection pipes (6) in a one-to-one correspondence manner.