CN111059800A

CN111059800A - Microchannel condenser assembly, microchannel condenser and air conditioner

Info

Publication number: CN111059800A
Application number: CN201911184138.0A
Authority: CN
Inventors: 马腾飞; 杨瑞琦; 郭忠玉; 徐勇程
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-04-24

Abstract

The application provides a microchannel condenser subassembly, microchannel condenser and air conditioner. The microchannel condenser assembly comprises a flow collecting piece, at least a first cavity and a second cavity which are connected with microchannel flat tubes, wherein the microchannel flat tubes inject fluid into the first cavity, and the microchannel flat tubes discharge the fluid from the second cavity; a semi-permeable membrane layer capable of trapping liquid and passing gas; the semi-permeable membrane layer is arranged in the first cavity and used for separating injected fluid, and a liquid discharge channel and an exhaust channel are arranged on the wall of the first cavity; the trapped liquid is directed out of the manifold by the drainage channel and the passing gas is directed to the second chamber by the exhaust channel. The condensed liquid in the collecting piece is led out, so that uneven distribution is prevented, and the heat exchange performance is improved.

Description

Microchannel condenser assembly, microchannel condenser and air conditioner

Technical Field

The application belongs to the technical field, and in particular relates to a micro-channel condenser assembly, a micro-channel condenser and an air conditioner.

Background

Compared with a finned tube heat exchanger, the micro-channel heat exchanger has the advantages of small heat exchanger size, good heat exchange effect and capability of reducing the refrigerant charge of a system. Due to the many advantages of microchannel heat exchangers, they are gradually receiving the attention of engineers. In the process of experimental research on the micro-channel heat exchanger, the phenomenon that a refrigerant entering a collecting pipe is separated into a gas phase and a liquid phase is found, the gas phase is gathered above the collecting pipe, and the liquid phase is gathered at the bottom of the collecting pipe, so that the flow distribution of the refrigerant entering the heat exchanger is uneven, and the uneven flow distribution of the refrigerant can generate great influence on the performance of the heat exchanger.

However, most of the prior arts only propose different methods to solve the problem of bias flow when the microchannel heat exchanger is used as an evaporator, that is, the performance of the evaporator is reduced due to uneven refrigerant flow distribution. Few techniques have proposed solutions to the problem of drift that occurs when microchannel heat exchangers are used as condensers. When the microchannel heat exchanger is used as an air-cooled condenser, especially a microchannel condenser with a plurality of processes, the problem of uneven flow distribution of refrigerant also exists in a flow collecting pipe at the process outlet, and further the heat exchange performance of the microchannel condenser is reduced.

When the microchannel is used as an evaporator, the method for improving the refrigerant flow distribution uniformity mainly adopts the method that the refrigerant flows outside the tube and then enters the collecting pipe or adopts different throttling structures inside the collecting pipe, and is the main current solution. The flow velocity of the refrigerant can be improved after throttling, the flowing state is closer to mist flow, the refrigerant shunting uniformity is improved, and the pressure drop of the heat exchanger is increased after throttling.

And the above method of improving the uniformity of the evaporator split flow is not suitable for a microchannel condenser because the flow and heat exchange characteristics of the refrigerant in the condenser are different from those in the evaporator. It is therefore desirable to provide a microchannel condenser with an innovative design to improve the uniformity of refrigerant flow distribution within the microchannel condenser.

Disclosure of Invention

Therefore, an object of the present invention is to provide a microchannel condenser assembly, a microchannel condenser and an air conditioner, which can ensure uniformity of refrigerant flow distribution.

In order to solve the above problems, the present application provides a microchannel condenser assembly comprising

The flow collecting part at least comprises a first cavity and a second cavity which are connected with micro-channel flat tubes, the micro-channel flat tubes inject fluid into the first cavity, and the second cavity discharges the fluid through the micro-channel flat tubes;

a semi-permeable membrane layer capable of trapping liquid and passing gas; the semi-permeable membrane layer is arranged in the first cavity and used for separating injected fluid, and a liquid discharge channel and an exhaust channel are arranged on the wall of the first cavity; the trapped liquid is directed out of the manifold by the drainage channel and the passing gas is directed to the second chamber by the exhaust channel.

Preferably, a partition is provided between the first chamber and the second chamber.

Preferably, the air discharge passage is a vent hole provided on the partition.

Preferably, the liquid discharge passage is a liquid hole provided on the partition.

Preferably, the separator and the current collector are of an integral structure.

Preferably, the current collecting piece is formed by splicing at least two parts, and the semi-permeable membrane layer is arranged at the splicing position.

Preferably, the semi-permeable membrane layer comprises a semi-permeable membrane and a fixing frame, and the semi-permeable membrane is arranged on the fixing frame.

According to another aspect of the present application, there is provided a microchannel condenser comprising a microchannel condenser assembly as described above.

Preferably, the collecting piece is a collecting pipe, the collecting pipe is connected with a condensate outlet pipe, and all the liquid discharge channels are communicated with the condensate outlet pipe.

According to yet another aspect of the present application, there is provided an air conditioner comprising a microchannel condenser assembly as described above or a microchannel condenser as described above.

The micro-channel condenser assembly comprises a flow collecting piece, at least a first cavity and a second cavity, wherein the first cavity and the second cavity are connected with micro-channel flat tubes, fluid is injected into the first cavity through the micro-channel flat tubes, and the fluid is discharged from the micro-channel flat tubes through the second cavity; a semi-permeable membrane layer capable of trapping liquid and passing gas; the semi-permeable membrane layer is arranged in the first cavity and used for separating injected fluid, and a liquid discharge channel and an exhaust channel are arranged on the wall of the first cavity; the trapped liquid is directed out of the manifold by the drainage channel and the passing gas is directed to the second chamber by the exhaust channel. The condensed liquid in the collecting piece is led out, so that uneven distribution is prevented, and the heat exchange performance is improved.

Drawings

FIG. 1 is a schematic structural view of a microchannel condenser assembly in accordance with an embodiment of the present application;

FIG. 2 is another schematic structural view of a microchannel condenser assembly in accordance with an embodiment of the present application;

FIG. 3 is a schematic view of a semi-permeable membrane layer structure according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a microchannel condenser according to an embodiment of the present application.

The reference numerals are represented as:

1. an inlet line; 2. a first header; 3. a second header; 31. a first pipe portion; 32. a second pipe portion; 33. a first chamber; 34. a second chamber; 4. a semi-permeable membrane layer; 41. a semi-permeable membrane; 42. a fixed mount; 5. a vent hole; 6. a spacer with a hole; 7. a liquid port; 8. a boss spacer; 9. a summary spacer; 10. a first process; 11. a second process; 12. a third process; 13. a supercooling process; 14. a spacer; 15. an outlet line.

Detailed Description

Referring collectively to FIGS. 1-3, in accordance with an embodiment of the present application, a microchannel condenser assembly includes

The flow collecting part at least comprises a first cavity 33 and a second cavity 34 which are connected with microchannel flat tubes, the microchannel flat tubes are used for injecting fluid into the first cavity 33, and the second cavity 34 is used for discharging fluid from the microchannel flat tubes;

a semi-permeable membrane layer 4 which can intercept liquid and pass gas; the semi-permeable membrane layer 4 is arranged in the first chamber 33 and used for separating injected fluid, and a liquid drainage channel and an air exhaust channel are arranged on the wall of the first chamber 33; the trapped liquid is directed out of the manifold by the drainage channels and the passing gas is directed to the second chamber 34 by the exhaust channels.

The semi-permeable membrane layer 4 is arranged in the first chamber 33 in the flow collecting piece, so that the fluid conveyed into the chamber is subjected to gas-liquid separation, the gas passes through the semi-permeable membrane layer 4, and the liquid is trapped; the liquid portion is directed out of the manifold, while the gas portion is directed into the second chamber 34 and discharged into the microchannel flat tubes.

In the mass flow piece, gas-liquid is separated and is led away respectively, can not take place the layering phenomenon, consequently also can not appear the inhomogeneous problem of flow distribution to heat transfer performance obtains improving.

In some embodiments, a partition is provided between the first chamber 33 and the second chamber 34, so that the first chamber 33 and the second chamber 34 are separated, so that the flow of fluid in the two chambers is relatively stable, and heat exchange is facilitated. The first chamber 33 and the second chamber 34 can be set to be of the same chamber structure, and the fluid outlet ends of the micro-channel flat tubes are covered by the semi-permeable film layer 4.

In some embodiments, the gas vent channel is a vent 5 formed in the partition, and the vent 5 is formed in the partition to direct gas passing through the translucent layer into the second chamber 34 to facilitate heat exchange of the gas entering the flat microchannel tubes.

In some embodiments, the liquid discharge channel is a liquid hole 7 formed in the partition, and the liquid hole 7 is formed in the partition, so that trapped liquid can be conveniently led out of the partition in time through the liquid hole 7, and the phenomenon of layering of the trapped liquid and gas in the same chamber is avoided.

In some embodiments, the separator and the current collector are of an integrated structure, the structure is stable, the manufacturing cost and the working procedure are saved, and the assembly process is reduced.

In some embodiments, the flow-collecting member is formed by splicing at least two parts, and the semipermeable membrane layer 4 is arranged at the spliced part. Constitute the mass flow piece through many parts concatenation mode, set up the 4 structures of semi-permeable rete in concatenation department, can with semi-permeable rete 4 fastening in the mass flow piece, avoid getting into the fluid impact of first cavity 33 and the semi-permeable rete 4 phenomenon of droing appears, influence normal use.

In some embodiments, the semipermeable membrane layer 4 includes a semipermeable membrane 41 and a fixing frame 42, and the semipermeable membrane 41 is disposed on the fixing frame 42. This improves the strength of the semi-permeable membrane layer 4 and its stability in the microchannel condenser assembly.

According to another embodiment of the present application, a microchannel condenser includes a microchannel condenser assembly as described above.

In some embodiments, the collecting member is a collecting pipe, the collecting pipe is connected with a condensate outlet pipe, and all the liquid discharge channels are communicated with the condensate outlet pipe.

The micro-channel condenser structure shown in fig. 4 mainly includes a first collecting pipe 2 and a second collecting pipe 3 which are vertically arranged, a plurality of micro-channel flat pipes which are horizontally arranged, and fins (not shown in the figure) which are arranged on the peripheries of the micro-channel flat pipes, wherein one end of each micro-channel flat pipe is inserted into the first collecting pipe 2, and the other end of each micro-channel flat pipe is inserted into the second collecting pipe 3. The fins are uniformly distributed along the axis of the micro-channel flat tube, and the air flow carries out heat exchange from the fins and the wall of the micro-channel flat tube, so that the purpose of condensing the air flow by cooling is realized.

Wherein, the first collecting pipe 2 is connected with an inlet pipeline 1 and an outlet pipeline 15; as shown in fig. 2 and 3, the first header 2 is divided into four chambers by the boss spacer 8, the perforated spacer 6, and the spacer 14, and the second header 3 is divided into four chambers by the perforated spacer 6, the boss spacer 8, and the collective spacer 9. The four cavities in the first collecting pipe 2 and the second collecting pipe 3 correspond to each other from top to bottom, and respectively correspond to a first flow 10, a second flow 11, a third flow 12 and a supercooling flow 13 in the flat microchannel pipe, and the total number is four refrigerant flows.

As shown in fig. 2 and 3, the first header 2 and the second header 3 are each formed by combining two left and right semi-cylindrical headers. The boss spacer 8, the perforated spacer 6 and the spacer 14 in the first collecting pipe 2 are composed of a left part and a right part, the left part and the right part of the spacer 14 are integrated corresponding to the left part and the right part of the collecting pipe respectively, the left part and the right part of the boss spacer 8 and the spacer 14 are of a symmetrical structure, and the left part and the right part of the perforated spacer 6 are of an asymmetrical structure. Foraminiferous spacer 6 in the second pressure manifold 3, boss spacer 8 and gather spacer 9 and constitute by controlling two parts to the integration is made to two parts about the corresponding pressure manifold respectively in two parts about the left and right sides of spacer 14, and two parts about boss spacer 8 are symmetrical structure, and foraminiferous spacer 6 is asymmetrical structure with two parts about gathering spacer 9.

In order to solve the problem of uneven flow distribution of the refrigerant in the cavity, a semi-permeable membrane layer 4 which only allows gas to pass through is arranged in the first cavity of each refrigerant flow outlet. As shown in fig. 4, the semi-permeable membrane layer 4 is located at the center of the collecting pipe cavity, the semi-permeable membrane layer 4 is perpendicular to the micro-channel flat pipe inserted into the first cavity, and the height of the semi-permeable membrane layer 4 is equal to the sum of the height in the first cavity and half of the thickness of the spacer 6 with the hole. The width of the semipermeable membrane layer 4 is equal to the inner diameter of the first cavity. The upper side and the lower side of the semipermeable membrane 41 are tightly pressed by the spacer 6 with holes and the boss in the second collecting pipe 3, and the front side and the rear side of the semipermeable membrane 41 are tightly pressed by the boss in the collecting pipe.

The inlet pipeline 1 is located in the middle of the highest cavity in the first collecting pipe 2 in the height direction, and the insertion depth of the inlet pipeline 1 is about 4-5 mm. The outlet pipeline 15 is located at a position, which is lower than the lowest cavity in the first collecting pipe 2, in the height direction, and the insertion depth of the outlet pipeline 15 is about 4-5 mm.

The high-temperature and high-pressure gas-phase refrigerant enters the microchannel condenser from the inlet pipeline 1, is condensed into a gas-liquid two-phase flow state in the first flow path 10, and flows into the first cavity in the second collecting pipe 3. The liquid-phase refrigerant flowing out of the first flow path 10 is blocked by the semi-permeable membrane layer 4 at the left half part of the first cavity in the second collecting pipe 3, and the gas-phase refrigerant enters the right half part of the first cavity in the second collecting pipe 3 through the semi-permeable membrane layer 4 and then flows into the second cavity of the second collecting pipe 3 through the vent holes 5 in the perforated partition 6. The separated liquid-phase refrigerant is discharged from the second header 3 through the liquid holes 7 of the perforated partition 6, and collected in the supercooling flow path 13.

The full gas phase refrigerant in the second cavity of the second collecting pipe 3 enters the second flow path 11, and is condensed into a gas-liquid two-phase flow state and then enters the first cavity of the first collecting pipe 2, and a semi-permeable membrane layer 4 structure is also arranged in the first cavity; therefore, the liquid-phase refrigerant flowing out of the second flow path 11 is blocked by the semi-permeable membrane layer 4 in the right half of the first cavity in the first header 2, and the gas-phase refrigerant enters the left half of the first cavity in the first header 2 through the semi-permeable membrane layer 4 and then flows into the second cavity in the first header 2 through the left air hole of the perforated partition 6. The separated liquid phase refrigerant flows into the supercooling flow path 13 through the right liquid hole 7 of the perforated partition 6.

Finally, after the refrigerant is completely condensed into a liquid phase, the refrigerant flows through the supercooling flow path 13, the refrigerant flows out through the outlet pipeline 15 in a certain supercooling state, and the whole microchannel condenser refrigerant flow path is finished. The semi-permeable membrane layer 4 separates the liquid phase in the refrigerant in a two-phase flow state, and the gas-phase refrigerant entering each flow is ensured, so that the uniformity of the flow of the refrigerant entering the flow is improved.

Wherein the semi-permeable membrane layer 4 can be made into a whole by a semi-permeable membrane 41 and an aluminum net rack to form a semi-permeable membrane net rack; as shown in fig. 2, the second header 3 is composed of a left and a right semi-circular headers sandwiching a semi-permeable membrane net frame and a semi-permeable membrane net frame.

According to yet another embodiment of the present application, an air conditioner includes a microchannel condenser assembly as described above or a microchannel condenser as described above.

It is easily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. 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. A microchannel condenser assembly comprising

The flow collecting part at least comprises a first cavity (33) and a second cavity (34) which are connected with micro-channel flat tubes, the micro-channel flat tubes are used for injecting fluid into the first cavity (33), and the second cavity (34) is used for discharging fluid from the micro-channel flat tubes;

a semipermeable membrane layer (4) which can intercept liquid and pass gas; the semi-permeable membrane layer (4) is arranged in the first chamber (33) and used for separating injected fluid, and a liquid drainage channel and an air exhaust channel are arranged on the wall of the first chamber (33); the trapped liquid is directed out of the manifold by the drainage channels and the passing gas is directed to the second chamber (34) by the exhaust channels.

2. The microchannel condenser assembly of claim 1 wherein a partition is provided between the first chamber (33) and the second chamber (34).

3. The microchannel condenser assembly of claim 2 wherein the vent channel is a vent (5) provided on the partition.

4. The microchannel condenser assembly of claim 2 or 3 wherein the drainage channels are liquid holes (7) provided in the partition.

5. The microchannel condenser assembly of claim 2 wherein the divider is of unitary construction with the header.

6. The microchannel condenser assembly of claim 1 wherein the flow collector is provided as a splice of at least two parts, the semi-permeable membrane layer (4) being provided at the splice.

7. The microchannel condenser assembly of claim 6, wherein the semi-permeable membrane layer (4) comprises a semi-permeable membrane (41) and a fixed frame (42), the semi-permeable membrane (41) being provided on the fixed frame (42).

8. A microchannel condenser comprising the microchannel condenser assembly of any one of claims 1-7.

9. The microchannel condenser of claim 8, wherein the manifold is a manifold to which a condensate outlet pipe is connected, and all of the drainage channels are in communication with the condensate outlet pipe.

10. An air conditioner comprising a microchannel condenser assembly as claimed in any one of claims 1 to 7 or a microchannel condenser as claimed in any one of claims 8 to 9.