CN112161504A

CN112161504A - Micro-channel heat exchanger and heat pump system with same

Info

Publication number: CN112161504A
Application number: CN202011019438.6A
Authority: CN
Inventors: 王凯; 吴迎文; 杨瑞琦
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-01-01

Abstract

The invention particularly discloses a micro-channel heat exchanger and a heat pump system with the same, and the micro-channel heat exchanger comprises a liquid pipe and at least one flat bend pipe, wherein a liquid pipe air outlet and a liquid pipe liquid inlet are formed in the side wall of the liquid pipe, the liquid pipe liquid inlet is positioned below the liquid pipe air outlet, one end of each flat bend pipe is connected to a first flat pipe connecting port in the side wall of the liquid pipe, and each flat bend pipe extends to the inside of the liquid pipe. The microchannel heat exchanger can separate a gas-phase refrigerant and a liquid-phase refrigerant as much as possible, and can more uniformly convey the gas-phase refrigerant and the liquid-phase refrigerant to the flat tubes, so that the dry evaporation of the heat exchanger is avoided, and the heat exchange performance of the microchannel heat exchanger is improved.

Description

Micro-channel heat exchanger and heat pump system with same

Technical Field

The invention relates to the technical field of heat exchangers, in particular to a micro-channel heat exchanger and a heat pump system with the same.

Background

Microchannels, also known as microchannel heat exchangers, are heat exchangers having channel equivalent diameters of 10 to 1000 μm. The heat exchanger has tens of fine flow channels in the flat tube, and the fine flow channels are connected to the circular headers at both ends of the flat tube. The header is internally provided with a baffle plate to divide the heat exchanger flow passage into a plurality of flows.

When the microchannel heat exchanger is used as an evaporator, an inlet refrigerant 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 refrigerant is obviously layered after entering the collecting pipe, so that the refrigerant entering a flat pipe is unevenly distributed, and the heat exchange performance of the heat exchanger is poor.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a micro-channel heat exchanger. This microchannel heat exchanger can make gaseous phase refrigerant and liquid phase refrigerant separate as far as possible to can carry to flat pipe more evenly, avoid the heat exchanger the condition that "dry steaming" appears.

The above problems to be solved by the present invention are achieved by the following technical solutions:

the utility model provides a microchannel heat exchanger, includes liquid pipe and at least one bend pipe, the lateral wall of liquid pipe is equipped with liquid pipe gas outlet and liquid pipe inlet, the liquid pipe inlet is located the below of liquid pipe gas outlet, the one end of bend pipe is all connected the flat union coupling mouth of first flat union coupling mouth of liquid pipe lateral wall and the bend pipe extends to the inside of liquid pipe.

Preferably, the elbow pipe includes flat horizontal portion and flat vertical portion, a port of flat vertical portion with a port of flat horizontal portion communicates as an organic whole perpendicularly and flat horizontal portion and flat vertical portion of pipe form L type elbow pipe, flat vertical position in the inside of liquid pipe.

Preferably, the other port of the flat tube longitudinal part is close to the liquid pipe inlet and the liquid pipe inlet is higher than the other port of the flat tube longitudinal part.

Preferably, the other ports of the longitudinal parts of the flat tubes are all located on the same water surface.

Preferably, the side end of the liquid pipe is provided with at least one spacer groove, the inner wall of the spacer groove is fixed with a spacer, and the spacer can divide the inside of the liquid pipe into at least two cavities.

Preferably, still include the trachea, tracheal side is equipped with the flat pipe connection mouth of second, the flat pipe connection mouth of second with the one end intercommunication of curved flat pipe.

Preferably, the other side end of the air pipe is provided with a first air pipe air guide opening and a second air pipe air guide opening, the second air pipe air guide opening is positioned below the first air pipe air guide opening, and the first air pipe air guide opening and the second air pipe air guide opening are both communicated with the circulating pipe group.

Preferably, the air outlet of the liquid pipe is communicated with the circulating pipe group through a first connecting pipe, and a one-way valve is arranged on the first connecting pipe.

Preferably, the heat pump system comprises the microchannel heat exchanger.

Preferably, the heat exchanger further comprises a circulating pipe group, a flow divider, a throttling device, a heat exchanger, a four-way valve and a compressor, wherein a first connecting port of the flow divider is communicated with a liquid inlet of the liquid pipe, a second connecting port of the flow divider is communicated with the first connecting port of the throttling device, a second connecting port of the throttling device is communicated with the first connecting port of the heat exchanger, a second communicating port of the heat exchanger is communicated with the four-way valve, the four-way valve is communicated with the circulating pipe group, and the compressor is communicated with the four-way valve.

Has the advantages that: after the structure is adopted, the liquid inlet of the liquid pipe is positioned below the gas outlet of the liquid pipe, after gas-liquid two-phase refrigerants enter the collecting pipe, the refrigerants are layered in the collecting pipe cavity, under the action of gravity, the liquid-phase refrigerants enter the heat exchanger through the port of the flat bend pipe extending into the liquid pipe at the lower part of the collecting pipe cavity, the gaseous refrigerants at the upper end do not pass through the heat exchanger and enter the heat exchange system from the gas outlet of the liquid pipe at the upper part of the liquid pipe, so that the refrigerant distribution of the flat bend pipe is more uniform, meanwhile, the dry steaming condition of the heat exchanger can be avoided, and the heat exchange performance.

Drawings

Fig. 1 is a schematic structural diagram of a microchannel heat exchanger according to the present invention.

Fig. 2 is a schematic structural diagram of a liquid pipe of a microchannel heat exchanger according to the present invention.

Fig. 3 is a schematic structural diagram of a microchannel heat exchanger according to the present invention.

Fig. 4 is a schematic diagram of a system cycle when the heat pump system of the present invention is used as an evaporator.

Fig. 5 is a schematic diagram of a system cycle when a heat pump system according to the present invention is used as a condenser.

FIGS. 1 to 5: 1-bending flat tubes; 2-a liquid pipe; 3-flat tube transverse part; 4-flat tube longitudinal section; 5-liquid tube air outlet; 6-liquid pipe liquid inlet; 7-a spacer; 8-spacer grooves; 9-a first flat pipe connector; 10-trachea; 11-first gas tube gas guide port; 12-a second flat pipe connector; 13-second tracheal catheter port; 14-a one-way valve; 15-a circulating pipe group; 16-a flow divider; 17-a throttling device; 18-a heat exchanger; 19-a four-way valve; 20-compressor.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific examples, which are not intended to limit the invention in any manner.

Example 1:

a microchannel heat exchanger as shown in fig. 1-2, comprising a liquid pipe 2 and at least one bend pipe 1, wherein the side wall of the liquid pipe 2 is provided with a liquid pipe outlet 5 and a liquid pipe inlet 6, the liquid pipe inlet 6 is located below the liquid pipe outlet 5, one end of the bend pipe 1 is connected to a first flat pipe connector 9 on the side wall of the liquid pipe 2, and the bend pipe 1 extends to the inside of the liquid pipe 2, wherein the shape of the liquid pipe 2 can be circular, square, D-shaped, etc.

In this embodiment, because the liquid pipe inlet is located the below of liquid pipe gas outlet, the double-phase refrigerant of gas-liquid gets into the inside back of pressure manifold, layering in the pressure manifold cavity, under the effect of gravity, the liquid phase refrigerant is in pressure manifold cavity lower part, get into the heat exchanger through extending into the inside curved flat tube port of liquid pipe, the gaseous state refrigerant of upper end does not pass through the heat exchanger, get into heat transfer system from liquid pipe gas outlet on liquid pipe upper portion, and then can realize the refrigerant reposition of redundant personnel more even state of curved flat tube, can also avoid the heat exchanger the condition that "dry steaming" appears simultaneously, be favorable to improving microchannel heat.

The other structure in this embodiment is the same as that in embodiment 1, except that: as shown in fig. 1-2, the flat bending pipe 1 includes a flat pipe transverse portion 3 and a flat pipe longitudinal portion 4, a port of the flat pipe longitudinal portion 4 is vertically communicated with a port of the flat pipe transverse portion 3 into a whole, the flat pipe transverse portion 3 and the flat pipe longitudinal portion 4 form an L-shaped flat bending pipe, the flat pipe longitudinal portion 4 is located inside the liquid pipe 2, a liquid-phase refrigerant can be more uniformly conveyed to the heat exchanger through the L-shaped flat bending pipe structure, and the heat exchanger can be prevented from being dry-steamed.

The other structures in this embodiment are the same as those in the above-described embodiment, except that: as shown in fig. 1-2, the other port of the flat tube longitudinal portion 4 is close to the liquid tube inlet 6, and the liquid tube inlet 6 is higher than the other port of the flat tube longitudinal portion 4, so that the liquid-phase refrigerant can be more uniformly delivered to the heat exchanger through the flat tube longitudinal portion at a proper and reasonable position, and the utilization rate of the liquid-phase refrigerant is improved.

The other structures in this embodiment are the same as those in the above-described embodiment, except that: as shown in fig. 1-2, the other ports of all the flat tube longitudinal portions 4 are located on the same water surface, and the ports of the flat tube longitudinal portions which are kept horizontal can further and more uniformly convey liquid-phase refrigerant gas.

The other structures in this embodiment are the same as those in the above-described embodiment, except that: as shown in fig. 1-2, the side end of the liquid pipe 2 is provided with at least one spacer groove 8, the inner wall of the spacer groove 8 is fixed with a spacer 7, the inside of the liquid pipe 2 can be divided into at least two cavities by the spacer 7, refrigerant gas can be quickly layered as much as possible by the separation effect of the spacer, the conveying speed and efficiency of the refrigerant gas are improved, and further the heat exchange efficiency is improved.

The other structures in this embodiment are the same as those in the above-described embodiment, except that: as shown in fig. 1, the air pipe 10 is further included, a second flat pipe connector 12 is arranged at a side end of the air pipe 10, and the second flat pipe connector 12 is communicated with one end of the bent flat pipe 1.

Specifically, the other side end of the air tube 10 is provided with a first air tube air guide opening 11 and a second air tube air guide opening 13, the second air tube air guide opening 13 is positioned below the first air tube air guide opening 11, and the first air tube air guide opening 11 and the second air tube air guide opening 13 are both communicated with a circulating tube group 15.

The other structures in this embodiment are the same as those in the above-described embodiment, except that: as shown in fig. 3, the liquid tube outlet 5 is communicated with the circulating tube set 15 through a first connecting tube, and a check valve 14 is arranged on the first connecting tube, so that the gaseous refrigerant can be more stably conveyed into the heat pump system through the check valve, and the utilization rate of the heat exchange medium is improved.

A heat pump system as shown in fig. 4-5, including the features of any of the embodiments described above.

Specifically, the liquid cooling system further comprises a circulating pipe group 15, a flow divider 16, a throttling device 17, a heat exchanger 18, a four-way valve 19 and a compressor 20, wherein a first connecting port of the flow divider 16 is communicated with the liquid inlet 6 of the liquid pipe, a second connecting port of the flow divider 16 is communicated with the first connecting port of the throttling device 17, a second connecting port of the throttling device 17 is communicated with the first connecting port of the heat exchanger 18, a second connecting port of the heat exchanger 18 is communicated with the four-way valve 19, the four-way valve 19 is communicated with the circulating pipe group 15, and the compressor 20 is communicated with the four-way valve 19.

The working principle is as follows: when the microchannel heat exchanger is used as an evaporator, ac communication and bd communication of the four-way valve are realized, a refrigerant discharged from a compressor enters the heat exchanger through the four-way valve to be condensed and released, then enters a throttling device (valve) to be throttled, then is divided into N paths through a splitter to enter the microchannel heat exchanger, wherein a liquid-phase refrigerant is evaporated and absorbed through a flat pipe and flows out from an outlet of an air pipe, a gas-phase refrigerant flows out of the upper part of a cavity, passes through a one-way valve to be subjected to gas-liquid bypass, then is converged with the refrigerant which is evaporated from the left side, and finally returns to the compressor through the four-way;

when the microchannel heat exchanger is used as a condenser, a and b of the four-way valve are communicated, c and d are communicated, refrigerant discharged from the compressor passes through the four-way valve, and due to the existence of the one-way valve, all gas-phase refrigerants enter from an air pipe, are condensed through the flat bend pipe to release heat, flow out through the liquid pipe to divide N paths, join through the flow divider, enter the throttling valve (device) to be throttled, then enter the heat exchanger to be evaporated and absorb heat, and then return to the compressor through the four-way valve to finish circulation.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, are used in the orientations and positional relationships indicated in the drawings and the terms "first" and "second" merely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a microchannel heat exchanger, its characterized in that, includes liquid pipe and at least one bend pipe, the lateral wall of liquid pipe is equipped with liquid pipe gas outlet and liquid pipe inlet, the liquid pipe inlet is located the below of liquid pipe gas outlet, the one end of bend pipe is all connected the first flat union coupling mouth of liquid pipe lateral wall and bend pipe extends to the inside of liquid pipe.

2. The micro-channel heat exchanger according to claim 1, wherein the flat tube comprises a flat tube transverse portion and a flat tube longitudinal portion, a port of the flat tube longitudinal portion is vertically communicated with a port of the flat tube transverse portion into a whole, the flat tube transverse portion and the flat tube longitudinal portion form an L-shaped flat tube, and the flat tube longitudinal portion is located inside the liquid tube.

3. The microchannel heat exchanger of claim 2, wherein the other port of the flattened tube longitudinal section is proximate to the tube inlet and the tube inlet is at a higher elevation than the other port of the flattened tube longitudinal section.

4. The microchannel heat exchanger of claim 2, wherein the other port of the longitudinal portion of the flat tube is at the same water level.

5. The microchannel heat exchanger of claim 1, wherein the liquid pipe is provided at a side end thereof with at least one spacer groove, and a spacer is fixed to an inner wall of the spacer groove, and the spacer can divide the inside of the liquid pipe into at least two cavities.

6. The micro-channel heat exchanger according to claim 1, further comprising a gas pipe, wherein a second flat pipe connector is arranged at a side end of the gas pipe, and the second flat pipe connector is communicated with one end of the bent flat pipe.

7. The microchannel heat exchanger of claim 6, wherein the other side end of the gas tube is provided with a first gas tube gas guide opening and a second gas tube gas guide opening, the second gas tube gas guide opening is positioned below the first gas tube gas guide opening, and the first gas tube gas guide opening and the second gas tube gas guide opening are both communicated with the circulating tube group.

8. The microchannel heat exchanger of claim 7, wherein the liquid-liquid outlet port is communicated with the circulation tube group through a first connection tube, and a check valve is provided on the first connection tube.

9. A heat pump system comprising a microchannel heat exchanger as described in any of claims 1-8 above.

10. The heat pump system according to claim 9, further comprising a circulation tube set, a flow divider, a throttle device, a heat exchanger, a four-way valve, and a compressor, wherein a first connection port of the flow divider is communicated with the liquid inlet of the liquid tube, a second connection port of the flow divider is communicated with the first connection port of the throttle device, a second connection port of the throttle device is communicated with the first connection port of the heat exchanger, a second connection port of the heat exchanger is communicated with the four-way valve, the four-way valve is communicated with the circulation tube set, and the compressor is communicated with the four-way valve.