CN111878908A

CN111878908A - Microchannel heat exchanger and heat pump system

Info

Publication number: CN111878908A
Application number: CN202010730724.7A
Authority: CN
Inventors: 李丽霞; 越飞; 肖庆; 李金伟
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2020-11-03

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), rotation coupling assembling and flat pipe (3), the first end and first pressure manifold (1) intercommunication of flat pipe (3), the second end and the second pressure manifold (2) intercommunication of flat pipe (3), the first end of flat pipe (3) can be connected through rotating between coupling assembling and first pressure manifold (1), the second end of flat pipe (3) can be connected through rotating between coupling assembling and the second pressure manifold (2). According to the micro-channel heat exchanger, a water bridge between the flat pipe and the fin can be broken, condensed water is rapidly discharged, the circulation rate of air is increased, and the heat exchange efficiency 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

With the continuous development of air conditioner heat exchange technology, the microchannel heat exchanger becomes one of the main directions of heat exchanger development due to the advantages of compact structure, light weight, low cost, high heat exchange efficiency, strong pressure resistance and the like. But the development of microchannel heat exchanger is on the one hand limited by the inhomogeneous problem of flat pipe microchannel windward side and leeward side heat transfer, and on the other hand, when the microchannel heat exchanger was as the evaporimeter in heat pump system, the comdenstion water that the surface produced was difficult to discharge, and compact structure's characteristics can lead to the comdenstion water to gather and form the water bridge between flat pipe and fin, has not only hindered the circulation of air and has reduced heat exchange efficiency, forms the condition of frosting and freezing on the heat exchanger surface more easily, has further reduced heat exchange efficiency. Even if the flat pipe is vertically installed or fins are continuously optimized, the problem of frosting is difficult to completely solve, and the problem is the main reason why the micro-channel heat exchanger is not generally applied to a heat pump system.

Therefore, how to rapidly drain the condensed water on the heat exchanger is a key technical problem for solving the application of the microchannel to the heat pump system.

Disclosure of Invention

Therefore, the technical problem that this application will be solved lies in providing a microchannel heat exchanger and heat pump system, can destroy the water bridge between flat pipe and the fin, makes the comdenstion water discharge rapidly, increases the circulation rate of air, improves heat exchange efficiency.

In order to solve the problem, the application provides a microchannel heat exchanger, including first pressure manifold, second pressure manifold, rotation coupling assembling and flat pipe, the first end and the first pressure manifold intercommunication of flat pipe, the second end and the second pressure manifold intercommunication of flat pipe, the first end of flat pipe can be connected through rotating between rotation coupling assembling and the first pressure manifold, the second end of flat pipe can be connected through rotating between rotation coupling assembling and the second pressure manifold.

Preferably, the microchannel heat exchanger further comprises a driving mechanism, the driving mechanism is in driving connection with the flat tube, and the flat driving tube rotates around the rotating axis of the rotating connection assembly.

Preferably, the rotating connection assembly comprises an adapter and a connecting piece, the adapter is arranged on the first collecting pipe and the second collecting pipe, the connecting piece and the adapter can be rotatably and hermetically connected, two ends of the flat pipe are respectively arranged on the connecting piece, and the flat pipe is communicated with the first collecting pipe and the second collecting pipe through the connecting piece and the adapter.

Preferably, the connecting piece is the knockout, and the knockout includes connecting portion and branch liquid portion, and connecting portion rotate with the adaptor to be connected, divides liquid portion to include two at least minute liquid chambeies, divides liquid portion to seted up the mounting groove towards one side of flat pipe, and every divides liquid chamber correspondence to be provided with at least one mounting groove, and flat pipe one-to-one is installed in the mounting groove, flat pipe with divide liquid chamber intercommunication.

Preferably, divide liquid portion cross-section for circular, the mounting groove sets up along the even interval of the circumference of dividing liquid portion, and the mounting groove extends along the radial of dividing liquid portion.

Preferably, the mounting grooves are arranged in one-to-one correspondence with the liquid separating cavities.

Preferably, the connecting portion include the passageway that overflows, divide liquid portion including casing and lid, and the casing includes inner ring and outer loop, inner ring and overflow the passageway intercommunication, is provided with the baffle in the annular chamber between inner ring and the outer loop, and the baffle separates into a plurality of branch sap cavities with the annular chamber, divides sap cavity and inner ring's inner chamber intercommunication, and the lid is established on the casing to seal inner ring's tip opening, the mounting groove is seted up on the lid.

Preferably, the inner ring is provided with a first liquid dividing hole at the connecting position with the connecting portion, the inner cavity of the inner ring is communicated with the overflowing channel through the first liquid dividing hole, the peripheral wall of the inner ring is provided with a second liquid dividing hole, the second liquid dividing hole corresponds to the liquid dividing cavities one by one, and the liquid dividing cavities are communicated with the inner cavity through the second liquid dividing hole.

Preferably, two double-phase separator as a set, two baffles in the same set are arranged at intervals, a liquid separating cavity is formed between the two baffles, the interval between the two baffles is equal to or larger than the thickness of the flat pipe, the flat pipe extends into the liquid separating cavity, and the cover body and the baffles are in sealing fit.

Preferably, the minimum distance between the flat pipe and the bottom surface of the shell is larger than the maximum distance between the second liquid separation hole and the bottom surface of the shell.

Preferably, the adaptor cup joints with connecting portion, is provided with annular groove including annular protrusion on the intraductal wall of sleeve of connecting portion on the internal perisporium of adaptor, and annular protrusion card forms to rotate sealing connection in going into annular groove.

Preferably, the mounting end of the adapter is provided with an arc-shaped groove, the arc-shaped groove is matched with the outer surface of the first collecting pipe or the second collecting pipe, and the adapter is welded and fixed with the first collecting pipe or the second collecting pipe through the arc-shaped groove.

Preferably, fins are arranged between adjacent flat tubes on the same liquid distributor.

Preferably, a driven gear is arranged on the connecting piece at the same end of the flat pipe, the driving mechanism is in driving connection with the driven gear through a transmission piece, and the flat pipe is driven to rotate.

Preferably, the transmission part is a transmission chain, the transmission chain is meshed with each driven gear, the output end of the driving mechanism is provided with a driving gear, and the driving gear is meshed with the transmission chain for transmission.

Preferably, a spacer is arranged in the middle of the first collecting pipe, the spacer divides the first collecting pipe into a liquid inlet part and a liquid outlet part, the liquid inlet part is connected with a pipe inlet assembly, and the liquid outlet part is connected with a pipe outlet assembly.

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

The utility model provides a microchannel heat exchanger, including first pressure manifold, second pressure manifold, rotation coupling assembling and flat pipe, the first end and the first pressure manifold intercommunication of flat pipe, the second end and the second pressure manifold intercommunication of flat pipe, the first end of flat pipe can be connected through rotating between coupling assembling and the first pressure manifold, the second end of flat pipe can be connected through rotating between coupling assembling and the second pressure manifold. The utility model provides a microchannel heat exchanger, because rotate through rotating coupling assembling between flat pipe and the pressure manifold and be connected, consequently make flat pipe can rotate for the pressure manifold, in the course of the work, when microchannel heat exchanger uses as the evaporimeter, can rotate the centrifugal action that forms and the water bridge between flat pipe and the fin is destroyed to the gravity action of comdenstion water self through control flat pipe, make the comdenstion water discharge rapidly, the circulation rate of increase air, the heat exchange efficiency is improved, can solve the problem that the heat exchanger surface frosted and freezes, realize heating in succession, the travelling comfort in room when improving the heating. In addition, because flat pipe can rotate at microchannel heat exchanger working process, consequently can make the windward side and the leeward side of flat pipe constantly alternate to can effectively solve the inhomogeneous problem of heat transfer, further improve heat exchange efficiency.

Drawings

FIG. 1 is an exploded view of a microchannel heat exchanger according to an embodiment of the present application;

FIG. 2 is a perspective view of a microchannel heat exchanger according to an embodiment of the present application;

FIG. 3 is an exploded view of a connector and an adapter of the microchannel heat exchanger according to an embodiment of the present disclosure;

FIG. 4 is a block diagram of an adapter of a microchannel heat exchanger according to an embodiment of the present application;

FIG. 5 is an exploded view of a liquid separator of a microchannel heat exchanger according to an embodiment of the present application;

fig. 6 is an internal structure view of a liquid distributor of a microchannel heat exchanger according to an embodiment of the present application;

fig. 7 is a perspective sectional view structural diagram of a liquid distributor of a microchannel heat exchanger according to an embodiment of the present application;

fig. 8 is a sectional view of a liquid distributor of a microchannel heat exchanger 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 drive mechanism; 5. an adapter; 6. a liquid separator; 7. a connecting portion; 8. a liquid separation cavity; 9. mounting grooves; 10. a housing; 11. a cover body; 12. an inner ring; 13. an outer ring; 14. a partition plate; 15. a first dispensing port; 16. a second dispensing hole; 17. an annular groove; 18. an annular projection; 19. a driven gear; 20. a drive chain; 21. a drive gear; 22. a tube inlet assembly; 23. a tube exit assembly; 24. a spacer; 25. and (7) mounting frames.

Detailed Description

With reference to fig. 1 to 8, according to an embodiment of the present application, the microchannel heat exchanger includes a first collecting pipe 1, a second collecting pipe 2, a rotation connection assembly and a flat pipe 3, a first end of the flat pipe 3 is communicated with the first collecting pipe 1, a second end of the flat pipe 3 is communicated with the second collecting pipe 2, the first end of the flat pipe 3 can be rotatably connected with the first collecting pipe 1 through the rotation connection assembly, and the second end of the flat pipe 3 can be rotatably connected with the second collecting pipe 2 through the rotation connection assembly.

The utility model provides a microchannel heat exchanger, because rotate through rotating coupling assembling between flat pipe 3 and the pressure manifold and be connected, consequently make flat pipe 3 can rotate for the pressure manifold, in the course of the work, when microchannel heat exchanger uses as the evaporimeter, can rotate the centrifugal action that forms and the water bridge between flat pipe 3 and the fin is destroyed to the gravity action of comdenstion water self through control flat pipe 3, make the comdenstion water discharge rapidly, the circulation rate of increase air, improve heat exchange efficiency, can solve the problem that the heat exchanger surface frosted and freezes, realize heating in succession, the travelling comfort in room when improving the heating. In addition, because flat pipe 3 can rotate in microchannel heat exchanger working process, consequently can make flat pipe 3's windward side and leeward side constantly alternate to can effectively solve the inhomogeneous problem of heat transfer, further improve heat exchange efficiency.

In microchannel heat exchanger working process, can intervene as required by the manual work, overturn flat pipe 3, adjust flat pipe 3's rotational position, change flat pipe 3's windward side and leeward side, avoid the uneven surface frosting's that leads to of flat pipe 3's heat transfer problem, can also in time adjust flat pipe 3's upset state simultaneously for the comdenstion water on the flat pipe 3 can in time be discharged away. The rotation of the flat pipe 3 can also be driven by a driving mechanism and controlled by a controller, so that the automation of the rotation control of the flat pipe 3 is realized.

In this embodiment, microchannel heat exchanger still includes actuating mechanism 4, and actuating mechanism 4 and flat 3 drive connection of pipe, flat 3 rotation axis rotation that revolute the rotation coupling assembling of drive pipe. Because the flat pipes 3 are multiple, if the flat pipes 3 need to be driven to rotate, the flat pipes 3 can be driven to rotate by adopting a mode that one flat pipe 3 is provided with one driving mechanism, the flat pipes 3 can also be driven to rotate by adopting a mode that a group of flat pipes 3 are provided with one driving mechanism, all the flat pipes 3 can also be in driving connection with one driving mechanism through a transmission mechanism, and the synchronous rotation control of all the flat pipes 3 is realized by utilizing one driving mechanism.

In this embodiment, the rotation connection assembly includes adaptor 5 and connecting piece, and adaptor 5 installs on first pressure manifold 1 and second pressure manifold 2, and the connecting piece can rotate sealing connection with adaptor 5, and the both ends of flat pipe 3 are installed respectively on the connecting piece, and flat pipe 3 communicates through connecting piece, adaptor 5 and first pressure manifold 1 and second pressure manifold 2. Because flat pipe 3 cross-section itself is the structure of similar rectangle, consequently, if directly be connected flat pipe 3 and pressure manifold, it is very difficult to realize the rotation between flat pipe 3 and the pressure manifold to be connected, consequently, has increased rotation coupling assembling in this application, comes to be as the middle transform structure of rotating between flat pipe 3 and the pressure manifold and being connected, can conveniently realize the rotation between flat pipe 3 and the pressure manifold and be connected. The rotation coupling assembling in this embodiment falls into two parts, adaptor 5 and connecting piece promptly, wherein adaptor 5 is fixed to be set up on the pressure manifold, fixed connection between connecting piece and the flat pipe 3, so, just can configure adaptor 5 and pressure manifold complex one end into the structure with pressure manifold looks adaptation, configure the one end that connecting piece and flat pipe 3 link to each other into the structure with flat pipe 3 looks adaptation, form the rotation connection structure in the hookup location department of adaptor 5 and connecting piece, be equivalent to will rotate coupling assembling and have divided into two parts, thereby will realize fixed connection and realize the part of rotation connection and decompose, simplify respective structure, can conveniently realize the rotation connection function.

In order to realize connection and rotary connection conveniently, one end of the adapter 5 is of a structure matched with the outer surface of the collecting pipe, the other end of the adapter is of a sleeve structure, one end of the connecting piece is provided with a flat pipe groove, the flat pipe 3 is installed in the flat pipe groove, the other end of the connecting piece is of a sleeve structure, and the sleeve structure of the adapter 5 is in sealing sleeve connection with the sleeve structure of the connecting piece, so that rotary sealing connection is realized.

In this embodiment, the connecting piece is knockout 6, and knockout 6 includes connecting portion 7 and branch liquid portion, and connecting portion 7 rotates with adaptor 5 to be connected, divides liquid portion to include two at least minute sap cavity 8, divides liquid portion to have seted up mounting groove 9 towards one side of flat pipe 3, and every minute sap cavity 8 correspondence is provided with at least one mounting groove 9, and flat pipe 3 is installed in mounting groove 9 one-to-one, flat pipe 3 and minute sap cavity 8 intercommunication. In this embodiment, divide liquid portion to include two at least minute liquid chambeies, separate each other spaced apart between the liquid chamber, and every divides liquid chamber to correspond to have at least one flat pipe 3, consequently all can set up a plurality of flat pipes 3 in every branch liquid portion to can increase the quantity of flat pipe 3, increase heat transfer area, improve heat exchange efficiency.

Divide liquid portion cross-section to be circular, mounting groove 9 sets up along the even interval of circumference that divides liquid portion, and mounting groove 9 is along dividing the radial extension of liquid portion, can be so that flat pipe 3 along the circumference evenly distributed who divides liquid portion to improve and divide liquid efficiency and divide liquid effect.

In this embodiment, mounting groove 9 sets up with dividing liquid chamber 8 one-to-one to make flat pipe 3 and divide liquid chamber 8 one-to-one, make to divide liquid to go on through knockout 6 completely, can further improve and divide liquid efficiency, improve and divide liquid homogeneity. Because every divides liquid portion to correspond a plurality of flat pipes 3, consequently can utilize the branch liquid chamber 8 of branch liquid portion to carry out the branch liquid to the refrigerant that enters into each flat pipe 3, improve the homogeneity of refrigerant in each flat pipe 3, and then improve flat pipe 3's heat transfer homogeneity.

Connecting portion 7 is including overflowing the passageway, divides liquid portion including casing 10 and lid 11, and casing 10 includes inner ring 12 and outer loop 13, inner ring 12 with overflow the passageway intercommunication, is provided with baffle 14 in the annular chamber between inner ring 12 and the outer loop 13, and baffle 14 separates into a plurality of branch sap cavity 8 with the annular chamber, divides the inner chamber intercommunication of sap cavity 8 and inner ring 12, and lid 11 lid is established on casing 10 to seal the tip opening of inner ring 12, and mounting groove 9 is seted up on lid 11.

When reaching the connecting part 7, the refrigerant enters the connecting part 7 through the overflowing channel, then reaches the inner ring 12, enters each liquid separating cavity 8 from the liquid separating hole on the side wall of the inner ring 12 for liquid separation, and then enters the corresponding flat tube 3 from each liquid separating cavity 8 for heat exchange. Lid 11 and casing 10 components of a whole that can function independently set up, later fixed connection together can conveniently carry out the processing of dividing the liquid structure in casing 10, can reduce the processing degree of difficulty. In addition, through processing mounting groove 9 on lid 11, can utilize mounting groove 9 to install the location to flat pipe 3, improve flat pipe 3's installation effectiveness.

In this embodiment, the top end surface of the casing 10 of the liquid separator is connected to the inner bottom end surface of the cover 11 by capillary welding, the outer annular wall of the casing 10 is welded to the cover 11, and four sealed spaces are formed inside the liquid separator for liquid separation, and the four sealed spaces are the liquid separation chambers 8.

In this embodiment, divide liquid chamber 8 to be four, and along the circumference evenly distributed of knockout, flat pipe 3 that every knockout corresponds also is four, set up corresponding to dividing liquid chamber 8, and along the circumference evenly distributed of knockout, mutually perpendicular between two adjacent flat pipe 3, each flat pipe 3 that is located on same knockout puts the department interval setting at the central point of knockout, thereby can form the air current flow channel, make things convenient for the air current can arrive the leeward side from the windward side smoothly, improve the heat exchange efficiency between air current and the flat pipe 3. Four flat pipe 3 that lie in on same knockout in this embodiment are a set of, and each flat pipe 3 of group carries out the design of shunting alone to can improve the homogeneity of flat pipe 3 reposition of redundant personnel, and then improve the heat exchange efficiency of heat exchanger, the flat pipe 3 that every knockout of this embodiment corresponds is not limited to four, also can be for two, three or other numbers.

The connection position department of inner ring 12 and connecting portion 7 is provided with first branch liquid hole 15, and the inner chamber of inner ring 12 passes through first branch liquid hole 15 and overflows the passageway intercommunication, has seted up the second on the perisporium of inner ring 12 and has divided liquid hole 16, and second divides liquid hole 16 and branch liquid chamber 8 one-to-one, divides liquid chamber 8 to pass through second and divides liquid hole 16 and inner chamber intercommunication. The first liquid separation holes 15 are located at the connecting position of the casing 10 and the connecting portion 7, the first liquid separation holes 15 are multiple and are uniformly distributed along the circumferential direction of the inner ring 12, and in the embodiment, the first liquid separation holes 15 are fan-shaped. After entering the connecting portion 7 from the channel that overflows, the refrigerant divides liquid through the first branch liquid hole 15, enters into the inner chamber of inner ring 12, then carries out secondary branch liquid through the second branch liquid hole 16 on the lateral wall of inner ring 12, enters into in dividing the liquid chamber 8, later enters into flat pipe 3 from dividing the liquid chamber 8 and carries out the heat transfer.

In this embodiment, two double-phase baffles 14 are a set, two baffles 14 in the same set are arranged at intervals, a sub-liquid chamber 8 is formed between the two baffles 14, the interval between the two baffles 14 is equal to or greater than the thickness of the flat tube 3, the flat tube 3 extends into the sub-liquid chamber 8, and the cover body 11 is in sealing fit with the baffles 14. In this embodiment, utilize 14 intervals to divide liquid chamber 8 to make the thickness that divides liquid chamber 8 and flat pipe 3's thickness phase-match, make the refrigerant in dividing liquid chamber 8 can enter into corresponding flat pipe 3 completely in, reduced the useless volume of dividing liquid chamber 8, improved the flow efficiency of refrigerant, improved the refrigerant utilization ratio.

The minimum distance between the flat tube 3 and the bottom surface of the shell 10 is larger than the maximum distance between the second liquid dividing hole 16 and the bottom surface of the shell 10, so that the refrigerant can smoothly flow into and out of the liquid dividing cavity 8. In this embodiment, the axial height of the first liquid dividing hole 15 is L1, the axial height of the second liquid dividing hole 16 is L2, and the axial height of the liquid dividing chamber 8 is H, wherein the size of L1 can be set according to the liquid dividing requirement, or set according to the thickness of the housing 10, and L2 is less than H, so that the liquid dividing chamber 8 is reserved with a certain height, and the flat tube 3 can extend into the liquid dividing chamber 8 to achieve good sealing connection with the liquid divider. Theoretically speaking, because the thickness of branch sap cavity 8 and flat pipe 3's thickness phase-match, consequently, the thickness can receive flat pipe 3's restriction, under this kind of condition, the area of overflowing of second branch sap hole 16 mainly receives L2's influence, L2 highly littleer, the area of second branch sap hole 16 is littleer, can produce certain injection effect to the refrigerant, thereby improve the mobile effect of refrigerant, can utilize the injection effect of refrigerant simultaneously, make the distribution of refrigerant in flat pipe 3 more even with flowing, further improve flat pipe 3's heat exchange efficiency.

The refrigerant that comes out from first pressure manifold 1 passes through adaptor 5, get into from the connecting portion 7 that is located the knockout of flat tub of 3 first ends, after 15 preliminary liquid separating of first liquid separating hole, reentrant second liquid separating hole 16 that is located the casing internal ring wall of knockout carries out liquid separating once more, later get into four branch liquid chamber 8 respectively, carry out the heat transfer in the microchannel that gets into flat tub of 3 through branch liquid chamber 8 at last, after the heat transfer, refrigerant rethread liquid separating ware gathers and gets into in adaptor 5 and the first pressure manifold 1 of second.

Adaptor 5 cup joints with connecting portion 7, is provided with annular protrusion 18 including on the intraductal wall of sleeve of connecting portion 7, is provided with annular groove 17 on the periphery wall of adaptor 5, and annular protrusion 18 card forms the rotation sealing connection in the annular groove 17. An annular projection 18 is arranged inside the connecting part 7 of the liquid distributor, a sealing ring is arranged on the top of the adapter 5, the sealing ring is integrally processed with the adapter 5, and the sealing ring is covered by a rubber coating to enhance the sealing effect. An annular groove 17 is provided in the adaptor 5 adjacent the sealing ring. During assembly, after the adaptor 5 is inserted into the connecting part 7, it is pulled out slightly backwards, so that the sealing ring is clamped at the end of the annular projection 18 and cannot be pulled out any further, while the annular projection 18 engages in the annular groove 17. When the gear drives the liquid distributor to rotate, the annular bulge 18 rotates 360 degrees in the annular groove 17, and meanwhile, the sealing effect on the refrigerant is achieved.

The mounting end of the adapter 5 is provided with an arc-shaped groove, the arc-shaped groove is matched with the outer surface of the first collecting pipe 1 or the second collecting pipe 2, and the adapter 5 is fixedly welded with the first collecting pipe 1 or the second collecting pipe 2 through the arc-shaped groove. The adaptor 5 and the header in this embodiment are connected by capillary welding.

Fins are arranged between the adjacent flat tubes 3 on the same liquid separator 6. The fins can be in various structural forms so as to further improve the heat exchange performance of the microchannel heat exchanger. In this embodiment, the contained angle between the adjacent flat pipe 3 is 90, and the fin between flat pipe 3 and the flat pipe 3 can be 90 fan-shaped, and evenly welds between two adjacent flat pipe 3.

Be located and be provided with driven gear 19 on the connecting piece of flat pipe with one end, actuating mechanism 4 is connected with driven gear 19 drive through the driving medium, drives flat pipe 3 and rotates.

The transmission part is a transmission chain 20, the transmission chain 20 is meshed with each driven gear 19, the output end of the driving mechanism 4 is provided with a driving gear 21, and the driving gear 21 is meshed with the transmission chain 20 for transmission. In the embodiment, one side of the transmission chain 20 is in meshed transmission with each driven gear 19, and the other side is far away from each driven gear 19 under the action of the driving mechanism 4, so that single-side driving transmission is realized. The driving mechanism 4 may also be arranged below or above the microchannel heat exchanger so that the driving chain 20 and the teeth of the driven gear 19 on both sides of the microchannel heat exchanger are in meshing relationship with the driving chain 20. The transmission member can also be other transmission structures, for example a transmission belt, and in this case, a transmission wheel needs to be arranged on the connecting member to realize transmission fit with the transmission belt. In other embodiments, the drive fit may also be achieved using a rack and pinion drive.

Referring to fig. 2, in this embodiment, the driven gear 19 is fixed to the connecting portion 7 of the liquid separator by welding, the driving gear 21 is driven by the driving motor, and then the driving chain 20 drives the driven gear 19 on the flat tube 3 to rotate, the teeth of the driven gear 19 on the eight groups of flat tubes 3 arranged in the vertical direction are sequentially embedded into the tooth holes of the driving chain 20, and under the driving of the driving chain 20, the eight groups of flat tubes 3 simultaneously rotate at the same speed counterclockwise or clockwise, so as to generate the whirlwind, thereby realizing the self-wind heat exchange, on the basis of the original heat exchange mode of air suction or blowing, further increasing the surface wind speed of the heat exchanger, meanwhile, the positions of the windward flat tube and the leeward flat tube are continuously exchanged, so that the heat exchange is more uniform, thereby greatly improving the heat exchange performance during the refrigeration/heating, and the condensed water is more easily discharged due to the continuous inversion of the flat tubes 3 during, the surface of the flat pipe 3 is not easy to form frost, thereby being beneficial to realizing continuous heating and improving the heating comfort.

The middle of the first collecting pipe 1 is provided with a spacer 24, the spacer 24 divides the first collecting pipe 1 into a liquid inlet part and a liquid outlet part, the liquid inlet part is connected with a pipe inlet assembly 22, and the liquid outlet part is connected with a pipe outlet assembly 23.

The microchannel heat exchanger further comprises a mounting frame 25, wherein the mounting frame 25 is fixedly connected with the first collecting pipe 1 and the second collecting pipe 2 and used for mounting the microchannel heat exchanger on other structures to realize the fixed mounting of the microchannel heat exchanger.

Taking the refrigeration operation as an example (refrigerant reverse flow during heating), the refrigerant enters from advancing tub subassembly 22, get into first pressure manifold 1 through adaptor 5, the reposition of redundant personnel district that shell 10 and lid 11 that rethread adaptor 5 got into the knockout shunts, the knockout divides the refrigerant into four ways in this embodiment, get into four flat pipes 3 respectively, after carrying out the heat transfer and the condensation in flat pipe 3, introduce the refrigerant into second pressure manifold 2 through adaptor 5 by shell 10 and lid 11 again, accomplish the heat transfer of first flow, later the refrigerant flows back to first pressure manifold 1 after carrying out the heat transfer from second pressure manifold 2 through flat pipe 3 of lower part, accomplish the heat transfer of second flow, flow out from exit tube subassembly 23 at last. In this embodiment, the first heat exchange process is composed of five groups of flat tubes 3, the second heat exchange process is composed of three groups of flat tubes 3, and the first collecting pipe 1 is divided into two independent sections by the spacer 24.

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.

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), rotates coupling assembling and flat pipe (3), the first end of flat pipe (3) with first pressure manifold (1) intercommunication, the second end of flat pipe (3) with second pressure manifold (2) intercommunication, the first end of flat pipe (3) can pass through rotate coupling assembling with rotate between first pressure manifold (1) and connect, the second end of flat pipe (3) can pass through rotate coupling assembling with rotate between the second pressure manifold (2) and connect.

2. The microchannel heat exchanger according to claim 1, further comprising a driving mechanism (4), wherein the driving mechanism (4) is in driving connection with the flat tube (3) to drive the flat tube (3) to rotate around the rotation axis of the rotation connection assembly.

3. The micro-channel heat exchanger according to claim 2, wherein the rotation connection assembly comprises an adapter (5) and a connecting member, the adapter (5) is mounted on the first collecting pipe (1) and the second collecting pipe (2), the connecting member is rotatably and hermetically connected with the adapter (5), two ends of the flat pipe (3) are respectively mounted on the connecting member, and the flat pipe (3) is communicated with the first collecting pipe (1) and the second collecting pipe (2) through the connecting member and the adapter (5).

4. The micro-channel heat exchanger according to claim 3, wherein the connecting member is a liquid distributor (6), the liquid distributor (6) comprises a connecting portion (7) and a liquid distributing portion, the connecting portion (7) is rotatably connected with the adapter (5), the liquid distributing portion comprises at least two liquid distributing cavities (8), one side of the liquid distributing portion, which faces the flat pipes (3), is provided with a mounting groove (9), each liquid distributing cavity (8) is correspondingly provided with at least one mounting groove (9), the flat pipes (3) are correspondingly mounted in the mounting grooves (9), and the flat pipes (3) are communicated with the liquid distributing cavities (8).

5. The microchannel heat exchanger according to claim 4, wherein the liquid separation part has a circular cross section, the mounting grooves (9) are arranged at regular intervals in the circumferential direction of the liquid separation part, and the mounting grooves (9) extend in the radial direction of the liquid separation part.

6. The micro-channel heat exchanger according to claim 4, wherein the mounting grooves (9) are arranged in one-to-one correspondence with the liquid distribution chambers (8).

7. The microchannel heat exchanger according to claim 4, wherein the connecting portion (7) comprises an overflowing channel, the liquid dividing portion comprises a casing (10) and a cover body (11), the casing (10) comprises an inner ring (12) and an outer ring (13), the inner ring (12) is communicated with the overflowing channel, a partition plate (14) is arranged in an annular cavity between the inner ring (12) and the outer ring (13), the annular cavity is divided into a plurality of liquid dividing cavities (8) by the partition plate (14), the liquid dividing cavities (8) are communicated with an inner cavity of the inner ring (12), the cover body (11) is covered on the casing (10) and closes an end opening of the inner ring (12), and the mounting groove (9) is opened on the cover body (11).

8. The microchannel heat exchanger according to claim 7, wherein a first liquid dividing hole (15) is formed at a connecting position of the inner ring (12) and the connecting part (7), an inner cavity of the inner ring (12) is communicated with the overflowing channel through the first liquid dividing hole (15), a second liquid dividing hole (16) is formed in the peripheral wall of the inner ring (12), the second liquid dividing holes (16) are in one-to-one correspondence with the liquid dividing cavities (8), and the liquid dividing cavities (8) are communicated with the inner cavity through the second liquid dividing holes (16).

9. The microchannel heat exchanger according to claim 8, wherein the partition plates (14) are grouped in pairs, two partition plates (14) in the same group are arranged at intervals, the liquid distribution chamber (8) is formed between the two partition plates (14), the interval between the two partition plates (14) is equal to or larger than the thickness of the flat pipe (3), the flat pipe (3) extends into the liquid distribution chamber (8), and the cover body (11) and the partition plates (14) are in sealing fit.

10. The microchannel heat exchanger according to claim 9, wherein the minimum distance of the flat tubes (3) from the bottom surface of the housing (10) is greater than the maximum distance between the second tap hole (16) and the bottom surface of the housing (10).

11. The microchannel heat exchanger according to claim 4, wherein the adaptor (5) is sleeved with the connecting part (7), an annular protrusion (18) is included on the inner wall of the sleeve of the connecting part (7), an annular groove (17) is provided on the outer peripheral wall of the adaptor (5), and the annular protrusion (18) is clamped into the annular groove (17) to form a rotary sealing connection.

12. The micro-channel heat exchanger according to claim 3, wherein the mounting end of the adapter (5) has an arc-shaped groove, the arc-shaped groove is matched with the outer surface of the first collecting pipe (1) or the second collecting pipe (2), and the adapter (5) is welded and fixed with the first collecting pipe (1) or the second collecting pipe (2) through the arc-shaped groove.

13. The microchannel heat exchanger according to claim 4, wherein fins are provided between adjacent flat tubes (3) on the same liquid separator (6).

14. The microchannel heat exchanger according to any one of claims 3 to 13, wherein a driven gear (19) is arranged on the connecting piece at the same end of the flat tube, and the driving mechanism (4) is in driving connection with the driven gear (19) through a transmission piece to drive the flat tube (3) to rotate.

15. The microchannel heat exchanger according to claim 14, wherein the transmission member is a transmission chain (20), the transmission chain (20) is meshed with each driven gear (19), the output end of the driving mechanism (4) is provided with a driving gear (21), and the driving gear (21) is meshed with the transmission chain (20) for transmission.

16. The microchannel heat exchanger according to any one of claims 1 to 13, wherein a spacer (24) is disposed in the middle of the first collecting pipe (1), the spacer (24) divides the first collecting pipe (1) into a liquid inlet portion and a liquid outlet portion, the liquid inlet portion is connected with a pipe inlet assembly (22), and the liquid outlet portion is connected with a pipe outlet assembly (23).

17. A heat pump system comprising a microchannel heat exchanger, wherein the microchannel heat exchanger is as claimed in any one of claims 1 to 16.