CN112944951A

CN112944951A - Microchannel heat exchanger and shunting structure

Info

Publication number: CN112944951A
Application number: CN202110355144.9A
Authority: CN
Inventors: 李九如; 郭晋; 陈巨辉
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2021-06-11

Abstract

The invention discloses a micro-channel heat exchanger, comprising: two headers; a plurality of micro-channel flat tubes are arranged between the two headers, the micro-channel flat tubes are respectively connected with the two headers fluid communication; a tree-like bifurcation is arranged on the flat tube of the microchannel; the end of the flat tube of the microchannel is inserted into the collecting tube; the bending angle is set on the collecting tube; A shunt is set inside the tube. By adopting the technical scheme of the present invention, through the bending angle set in the collecting pipe, the coolant is distributed in the collecting pipe under the action of gravity, and the refrigerant is evenly distributed through the flow divider, thereby reducing the uneven distribution of the refrigerant. The resulting problem of insufficient heat exchange.

Description

Microchannel heat exchanger and shunting structure

Technical Field

The invention relates to a micro-channel heat exchanger, in particular to a micro-channel heat exchanger and a flow distribution structure thereof.

Background

The micro-channel heat exchanger is a heat exchanger widely used in refrigeration air conditioners, and has the advantages of high heat exchange efficiency, small working medium consumption and the like compared with the traditional heat exchanger; with the increasing requirements of people on environmental protection and energy conservation, the micro-channel heat exchanger can be widely used in various industries, such as the air conditioning industry, the automobile industry, the chemical and mechanical industry and the like, by virtue of the advantages of the micro-channel heat exchanger; the heat exchanger consists of a left collecting pipe, a right collecting pipe, flat pipes arranged between the two collecting pipes and a tree-shaped structure distributed on the flat pipes; two ends of the micro-channel flat tube are respectively inserted into the left collecting pipe and the right collecting pipe; working medium flows into the microchannel of the flat tube from the left collecting pipe and flows out from the right collecting pipe; however, because the common microchannel heat exchanger is caused by the gravity action of the working medium, the heat exchange performance of the heat exchanger is influenced by the difference of the quantities of the working medium entering the flat tubes of all parts; it is therefore desirable to provide an improved structure to address this problem.

Disclosure of Invention

One of the objectives of the present invention is to provide a flow dividing structure for a microchannel heat exchanger, which can play an important role in the distribution of refrigerant, thereby improving the heat exchange efficiency of the microchannel heat exchanger.

The invention also aims to provide the micro-channel heat exchanger capable of improving the heat exchange efficiency.

Therefore, the structure of the micro-channel heat exchanger is further improved to improve the heat exchange performance.

In order to achieve one of the purposes, the invention adopts the following technical scheme: a flow dividing structure of a micro-channel heat exchanger is arranged in a collecting pipe on the left side, a plurality of small holes are formed in the flow dividing structure, the two ends of the flow dividing structure are consistent with the bending angle of the collecting pipe, and a plurality of small holes are distributed below the collecting pipe and are distributed corresponding to the small holes of the flow dividing structure, so that the refrigerant is guaranteed to be uniformly distributed.

Be provided with a both ends in the shunt and have the track of spring even, along with the refrigerant gets into from the entry, because the action of gravity of refrigerant can make track both ends spring compression, the aperture that sets up on the track corresponds with the aperture that the shunt set up for during refrigerant evenly distributed to whole pressure manifold, evenly get into flat tub again, even through the distribution of refrigerant in order this to come, increase heat exchange efficiency.

In order to achieve the second purpose, the invention adopts the following technical scheme: the utility model provides a microchannel heat exchanger, includes the pressure manifold, reposition of redundant personnel structure and flat pipe, and the both sides department of flat pipe is equipped with buckles, is equipped with tree-like structure on the flat pipe, through tree-like structure, has increased the heat transfer area in the flat pipe of refrigerant again, and then has improved microchannel heat exchanger's heat exchange efficiency.

Drawings

FIG. 1 is a schematic perspective view of one type of microchannel heat exchanger.

Fig. 2 is a shunting structure.

Fig. 3 is a planar view of the left header of fig. 1.

Fig. 4 is a view of the connection between the flat pipe and the header in fig. 1.

In the figure: 1. flat pipe, 2, left pressure manifold, 3, right pressure manifold, 4, refrigerant entry, 5, refrigerant export, 6, reposition of redundant personnel structure, 61, spring, 62, reposition of redundant personnel structure bottom plate, 63, reposition of redundant personnel structure spout, 64, reposition of redundant personnel structure track.

Detailed Description

The following description of the preferred embodiments of the present invention is provided in connection with the accompanying drawings, and it is to be understood that the following description of the preferred embodiments is made for the purpose of illustrating the invention only.

A preferred embodiment of the microchannel heat exchanger of the present invention will first be described with reference to fig. 1. In this example, the microchannel heat exchanger includes a left header 2, a right header 3, and a plurality of flat tubes 1 and their tree structures as shown in the drawing. The flat pipe 1 is positioned between the left collecting pipe 2 and the right collecting pipe 3, is parallel to the ground and is vertically connected with the left collecting pipe 2 and the right collecting pipe 3. The left collecting pipe 2 is internally provided with a shunting structure 6, a refrigerant enters from an upper refrigerant inlet 4 of the left collecting pipe 2 in the figure 1, passes through the shunting structure in the figure 2, passes through the left collecting pipe 2 in the figure 1, approaches the flat pipe 1 in the figure 1, enters the right collecting pipe 3 in the figure 1, and then finishes the whole stroke from refrigerant outlets 5 at two ends of the collecting pipe.

The flow splitting structure 6 of fig. 2 employed in the microchannel heat exchanger described above is a preferred embodiment of the present invention. As shown in fig. 1, a shunting structure is arranged inside the left collecting pipe 2, wherein as shown in fig. 2, a shunting structure bottom plate 62 is connected with the collecting pipe in a welded manner, as shown in fig. 2, a shunting structure sliding groove 63 is connected with the left collecting pipe 2 in a sliding way, as shown in fig. 2, a shunting structure crawler 64 is made of memory alloy and is connected with the shunting structure 6 in fig. 2, and springs 61 are arranged at two ends of the shunting structure 6 in fig. 2, so that the refrigerant is uniformly distributed when flowing into the whole shunt and then uniformly enters the left collecting pipe 2, so that the refrigerant uniformly enters the flat pipe 1 in fig. 1, the collecting pipe and the flat pipe are made of aluminum alloy, and certainly, the collecting pipe and.

In another preferred embodiment of the microchannel heat exchanger, the tree-shaped structure of the flat tube 1 increases the heat exchange area, and the heat exchange efficiency of the microchannel is further improved by utilizing the bionics principle.

Various changes and modifications to the above-described aspects of the present invention will become apparent to those skilled in the art without departing from the scope and spirit of the invention, and although the invention has been described in conjunction with specific preferred embodiments, it is to be understood that the invention as claimed is not limited to those specific embodiments; indeed, various modifications of the described modes for carrying out the invention which are obvious to those skilled in the relevant fields are intended to be within the scope of the invention as claimed.

Claims

1. A microchannel heat exchanger, comprising a left header (2) and a right header (3): a plurality of tubes arranged between the left header (2) and the right header (3) There are two flat microchannel tubes (1), and the flat microchannel tubes (1) are respectively connected with the left header (2) and the right header (3); the flat microchannel tubes (1) are arranged close to the The left header (2) and the right header (3) are bent; the tree-like bifurcation structure arranged on the microchannel flat tube (1); the microchannel headers (2, 3) ) is bent on the tube body, wherein a split flow structure (6) is provided in the left header (2) of the microchannel heat exchanger.

2. The microchannel heat exchanger according to claim 1, wherein the left header (2) and the right header (3) of the microchannel are bent at both ends, and the bending angle is 150° °-160°.

3. The microchannel heat exchanger according to claim 1, wherein the microchannel flat tubes (1) form a 90° circle near the left header (2) and the right header (3) arc connected.

4 . The microchannel heat exchanger according to claim 1 , wherein the microchannel flat tubes ( 1 ) are provided with a tree-like bifurcation structure. 5 .

5. The microchannel heat exchanger according to claim 1, characterized in that, a flow splitting structure (6) is arranged inside the left microchannel header (2).

6 . The flow dividing structure ( 6 ) according to claim 5 , characterized in that, the flow dividing structure ( 6 ) is provided with a spring and a plurality of small holes. 7 .