CN112413929A

CN112413929A - A microchannel heat exchanger and heat pump system

Info

Publication number: CN112413929A
Application number: CN202011271038.4A
Authority: CN
Inventors: 王凯; 吴迎文; 杨瑞琦; 王鹏恩; 马腾飞
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-02-26

Abstract

The invention discloses a micro-channel heat exchanger and a heat pump system, comprising a gas collecting pipe, a fin, a flat pipe and a collecting pipe. The fins are covered, the gas collecting pipe is connected with an air outlet pipe, and the liquid collecting pipe is connected with a liquid inlet pipe. The present invention is provided with a baffle, which divides the collector cavity into two left and right cavities, which is conducive to the mixing of refrigerants from the first cavity to the second cavity, and each cavity is connected with a plurality of flat tubes. The realization of the diversion ensures the uniformity of the refrigerant and improves the uniformity. The refrigerant entering each flat tube is relatively uniform, and there will be no phenomenon of "dry evaporation" of the heat exchanger or insufficient evaporation of the refrigerant, which is conducive to improving the exchange rate. Heat transfer performance of the heater.

Description

Micro-channel heat exchanger and heat pump system

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.

Background

Evaporation is a physical process by which a liquid state is converted to a gaseous state. Generally, an evaporator is a device that converts a liquid substance into a gaseous substance. There are a large number of evaporators in the industry, of which the evaporator used in refrigeration systems is one. The evaporator is an important part in four major refrigeration parts, and low-temperature condensed liquid passes through the evaporator to exchange heat with external air, gasifies and absorbs heat, and achieves the refrigeration effect. The evaporator mainly comprises a heating chamber and an evaporation chamber. The heating chamber provides heat required by evaporation to the liquid to promote boiling and vaporization of the liquid; the evaporation chamber makes the gas phase and the liquid phase completely separated.

When the microchannel heat exchanger is used as an evaporator, the layering phenomenon is obvious after gas-liquid two-phase refrigerants enter the collecting pipe, so that the refrigerants entering the flat pipe are unevenly distributed, and the heat exchange performance of the heat exchanger is poor.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the micro-channel heat exchanger and the heat pump system, which realize the flow distribution, ensure the uniformity of the refrigerant, improve the uniformity, avoid the phenomenon of 'dry evaporation' of the heat exchanger or insufficient evaporation of the refrigerant, and are favorable for improving the heat exchange performance of the heat exchanger

In order to achieve the purpose, the invention provides the following technical scheme:

the micro-channel heat exchanger comprises a gas collecting pipe, fins, flat pipes and a liquid collecting pipe, wherein the gas collecting pipe and the liquid collecting pipe are connected through the flat pipes, the fins are sleeved on the outer sides of the flat pipes, the gas collecting pipe is connected with an air outlet pipe, and the liquid collecting pipe is connected with a liquid inlet pipe.

Preferably, the inside of the liquid collecting pipe is divided into a plurality of shunting cavities through a plurality of partition plates, a vertical baffle and a transverse shunting cavity plate are arranged in each shunting cavity, the upper end of each baffle is connected with the corresponding partition plate, a first cavity and a second cavity are respectively arranged on two sides of each baffle, a third cavity is formed between each shunting cavity plate and each partition plate, a connecting pipe hole connected with the corresponding liquid inlet pipe is formed in the side wall of each third cavity, a first liquid inlet hole communicated with the corresponding first cavity and a second liquid inlet hole communicated with the corresponding second cavity are formed in each shunting cavity, a through hole is formed in each baffle, and a liquid outlet hole connected with the flat pipe is formed in the side wall of each second cavity.

Preferably, the diameter of the first liquid inlet hole is smaller than that of the second liquid inlet hole.

Preferably, both ends of the liquid collecting pipe are provided with detachable end covers.

Preferably, both ends of the baffle are provided with through holes.

Preferably, two of the through holes are of an open slot structure.

Preferably, the through hole at the lower end is an open slot structure.

Preferably, the flat tube extends to a length which is half of the width of the second cavity.

A heat pump system comprising the microchannel heat exchanger of any one of the above.

Compared with the prior art, the invention has the beneficial effects that:

the invention is provided with the baffle plate, the baffle plate divides the collecting pipe cavity into a left cavity and a right cavity, the mixing of refrigerants is facilitated from the first cavity to the second cavity, each cavity is connected with the flat pipes, the distribution is realized, the uniformity of the refrigerants is ensured, the uniformity is improved, the refrigerants entering the flat pipes are uniform, the phenomenon of 'dry evaporation' of a heat exchanger or insufficient evaporation of the refrigerants due to excessive refrigerants can not occur, and the improvement of the heat exchange performance of the heat exchanger is facilitated.

Drawings

FIG. 1 is a schematic structural diagram of a microchannel heat exchanger;

FIG. 2 is a schematic structural view of a header;

FIG. 3 is a schematic structural view of a cavity plate;

FIG. 4 is a first schematic structural view of a baffle;

FIG. 5 is a second schematic structural view of a baffle;

fig. 6 is a schematic structural diagram of a baffle plate.

In the figure: 1-air outlet pipe; 2-a gas collecting pipe; 3-a fin; 4-flat tube; 5, collecting pipe; 501-connecting pipe holes; 502-a first inlet well; 503-a first cavity; 504-a baffle; 505-through holes; 506-a separator; 507-liquid outlet holes; 508-a second liquid inlet hole; 509-a cavity dividing plate; 510-a third cavity; 511-a second cavity; 6-liquid inlet pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the first embodiment, the first step is,

as shown in fig. 1, the microchannel heat exchanger comprises a gas collecting pipe 2, fins 3, flat pipes 4 and a collecting pipe 5, wherein the gas collecting pipe 2 is connected with the collecting pipe through the flat pipes 4, the fins 3 are sleeved outside the flat pipes 4, the gas collecting pipe 2 is connected with a gas outlet pipe 1, and the liquid collecting pipe is connected with a liquid inlet pipe 6.

As shown in fig. 2, the inside of the liquid collecting tube is divided into a plurality of flow dividing cavities by a plurality of partition plates 506, a vertical baffle 504 and a horizontal chamber dividing plate 509 are arranged in each flow dividing cavity, the upper end of the baffle 504 is connected with the partition plate 506, a first cavity 503 and a second cavity 511 are respectively arranged on two sides of the baffle 504, a third cavity 510 is formed between the chamber dividing plate 509 and the partition plate 506, a connecting pipe hole 501 connected with a liquid inlet pipe 6 is arranged on the side wall of the third cavity 510, a first liquid inlet hole 502 communicated with the first cavity 503 and a second liquid inlet hole 508 communicated with the second cavity 511 are arranged on the chamber dividing plate 509, a through hole 505 is arranged on the baffle 504, and a liquid outlet hole 507 connected with a flat pipe 4 is arranged on the side wall of the second cavity 511.

As shown in fig. 3, the diameter of the first liquid inlet hole 502 is smaller than the diameter of the second liquid inlet hole 508.

And two ends of the liquid collecting pipe are provided with detachable end covers.

The extension length of the flat tube 4 is half of the width of the second cavity 511.

As shown in fig. 6, the baffle 504 has through holes 505 at both ends, and the hole pattern is circular or square.

Under the heating working condition, the refrigerant enters the third cavity 510 from the first liquid inlet hole 502, then enters the first cavity 503 through the first liquid inlet hole 502, enters the second cavity 511 through the second liquid inlet hole 508, enters the second cavity 511 through the through hole 505 of the refrigerant in the first cavity 503, and finally enters the heat exchanger through the flat pipe 4.

In the second embodiment, the first embodiment of the method,

As shown in fig. 6, through holes 505 are provided at both ends of the baffle 504, and as shown in fig. 4, in this embodiment, the two through holes 505 are open-slot structures.

In the third embodiment, the first step is that,

As shown in fig. 6, the baffle 504 has through holes 505 at both ends, and as shown in fig. 5, in this embodiment, the through hole 505 at the upper end is square, and the through hole 505 at the lower end is an open-slot structure.

In the fourth embodiment, the first step is that,

the utility model provides a heat pump system, includes microchannel heat exchanger, including gas collecting pipe 2, fin 3, flat pipe 4 and collecting pipe 5, connect through flat pipe 4 between gas collecting pipe 2 and the collecting pipe, the outside cover of flat pipe 4 has fin 3, even there is outlet duct 1 on the gas collecting pipe 2, even there is feed liquor pipe 6 on the collecting pipe.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. a micro-channel heat exchanger, it is characterized in that: comprise gas collecting pipe, fin, flat pipe and collecting pipe, between described gas collecting pipe and liquid collecting pipe by flat pipe connection, the outer side of described flat pipe is sleeved There are fins, the gas collecting pipe is connected with an air outlet pipe, and the liquid collecting pipe is connected with a liquid inlet pipe.

2 . The microchannel heat exchanger according to claim 1 , wherein the inside of the liquid collecting pipe is divided into a plurality of shunt cavities by a plurality of baffle plates, and the shunt cavities are provided with vertical The upper end of the baffle is connected with the partition, the two sides of the baffle are the first cavity and the second cavity respectively, and the space between the cavity plate and the partition is A third cavity is formed, the side wall of the third cavity is provided with a nozzle hole connected with the liquid inlet pipe, and the sub-chamber plate is provided with a first liquid inlet hole communicated with the first cavity and The two cavities are connected with the second liquid inlet hole, the baffle is provided with a through hole, and the side wall of the second cavity is provided with a liquid outlet hole connected with the flat tube.

3 . The microchannel heat exchanger according to claim 2 , wherein the diameter of the first liquid inlet hole is smaller than the diameter of the second liquid inlet hole. 4 .

4 . The microchannel heat exchanger according to claim 1 , wherein the two ends of the liquid collecting pipe are provided with detachable end caps. 5 .

5 . The microchannel heat exchanger according to claim 1 , wherein both ends of the baffle plate are provided with through holes. 6 .

6 . The microchannel heat exchanger according to claim 4 , wherein the two through holes are of open-slot structure. 7 .

7 . The microchannel heat exchanger according to claim 4 , wherein the through hole at the lower end is an open slot structure. 8 .

8 . The microchannel heat exchanger according to claim 1 , wherein the flat tube extends to a length that is half of the width of the second cavity. 9 .

9. A heat pump system, characterized in that it comprises the microchannel heat exchanger according to any one of claims 1-8.