CN214333107U - Micro-channel heat exchanger with uniform flow distribution and air conditioning unit with micro-channel heat exchanger - Google Patents

Abstract

The utility model discloses an even microchannel heat exchanger shunts, include: the middle part of the collecting pipe is provided with a collecting cavity which is used for guiding a refrigerant object; the flow guide spacer is connected inside the collecting pipe and communicated with the collecting cavity and is used for changing the running track of a refrigerant object into forward rotation to form stable circulation; the end part of the flat pipe is arc-shaped, and the flat pipe is positioned above the drainage spacer and communicated with the flow collecting cavity for heat transfer. The utility model discloses an even microchannel heat exchanger of reposition of redundant personnel's simple structure is reasonable, because flat tub of tip is circular-arcly again, makes flat tub of insertion pressure manifold degree of depth unanimous, because the refrigerant flow pattern is stable, can realize that liquid refrigerant distributes evenly and gets into flat tub, guarantees that microchannel heat exchanger's heat transfer is even.

Description

Micro-channel heat exchanger with uniform flow distribution and air conditioning unit with micro-channel heat exchanger

Technical Field

The utility model relates to a heat exchanger technical field, concretely relates to even microchannel heat exchanger of reposition of redundant personnel and have its air conditioning unit.

Background

The existing micro-channel heat exchanger consists of two collecting pipes, a plurality of flat pipes and fins. The collecting pipe is generally vertically arranged, when the heat exchanger is used for an evaporator, two-phase refrigerants enter from the lower part of the collecting pipe, and due to the influence of gravity, the liquid refrigerants are unevenly distributed, the number of the liquid refrigerants of the lower flat pipe in the same flow is relatively large, the number of the liquid refrigerants of the upper flat pipe is relatively small, or even the liquid refrigerants of the upper flat pipe are not available, so that the performance of the heat exchanger cannot be fully exerted, and the heat exchange performance of the whole machine is restricted.

Just like the content of a vortex device and shunt subassembly and air conditioning unit of patent CN201910919279.6 proposes to set up the vortex device in front of the shunt, lets the refrigerant flow in spiral vortex body and produces the circulation, lets the gas-liquid two-phase state along the circumferencial direction symmetric distribution, creates favorable entry condition for the shunt reposition of redundant personnel, improves the reposition of redundant personnel homogeneity, and spiral vortex body machining precision is higher, and processing is complicated difficult to make.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide an even microchannel heat exchanger shunts. The micro-channel heat exchanger with uniform distribution has a simple and reasonable structure, can realize uniform distribution of liquid refrigerants to enter the flat tubes, and ensures uniform heat exchange of the micro-channel heat exchanger.

The utility model discloses the above-mentioned problem that will solve can be realized through following technical scheme:

a uniform flow distribution microchannel heat exchanger comprising: the middle part of the collecting pipe is provided with a collecting cavity which is used for guiding a refrigerant object; the flow guide spacer is connected inside the collecting pipe and communicated with the collecting cavity and is used for changing the running track of a refrigerant object into forward rotation to form stable circulation; the port is an arc-shaped flat pipe, the flat pipe is positioned above the drainage spacer and communicated with the flow collecting cavity, and the annular flow type refrigerant is combined to enable liquid refrigerant to uniformly enter and enable heat exchange to be uniform.

Preferably, the middle part of the drainage spacer is provided with a flow guide inclined hole, the flow guide inclined hole is communicated with the flow collecting cavity, and an included angle beta between the inclined open hole axis of the flow guide inclined hole and the vertical axis of the drainage spacer is 20-60 degrees.

Preferably, the flow guide inclined holes are arranged in an annular inclined open hole group at equal intervals by taking the circle center of the flow guide spacer as the center.

Preferably, the number of turns of the annular inclined open hole group can be 1 turn or more, and the centers of the spacers are used as the centers of the circles and are uniformly distributed in different radiuses.

Preferably, the drainage septum has a thickness greater than or equal to 5 mm.

Preferably, the end face of the flat pipe inserted into the collecting pipe is arc-shaped and parallel to the inner wall surface of the collecting pipe.

Preferably, the distance between the end face of the flat pipe extending into the collecting pipe and the inner wall surface of the collecting pipe is less than or equal to 3 mm.

Preferably, an air conditioning unit comprises the uniformly-divided microchannel heat exchanger.

Has the advantages that: after the structure of the utility model is adopted, the refrigerant object in gas-liquid two-phase state can be conveyed in a rotating way through the drainage spacer, because the rotation generates centrifugal force, the inertia of the liquid refrigerant object is thrown to the pipe wall too much, and the refrigerant object spirally moves forward near the pipe wall, the inertia of the gas refrigerant is small, and the refrigerant object flows in the center of the pipe to form stable circulation; in the stable circulation, the liquid refrigerant uniformly enters the flat tubes, so that the whole heat exchanger is uniformly distributed, and the problem of nonuniform distribution of the liquid refrigerant entering the flat tubes due to unstable flow patterns is solved.

Drawings

Fig. 1 is a schematic view of the main structure of a microchannel heat exchanger with uniform flow distribution according to the present invention.

Fig. 2 is a schematic structural view of a drainage spacer of a microchannel heat exchanger with uniform flow distribution.

Fig. 3 is a schematic sectional view of a drainage spacer of a microchannel heat exchanger with uniform flow distribution according to the present invention.

Fig. 4 is a structural schematic diagram of a micro-channel heat exchanger's flat pipe that reposition of redundant personnel is even.

Fig. 5 is an enlarged schematic structural diagram of a portion a of the uniform-flow-dividing microchannel heat exchanger according to the present invention.

FIG. 6: the liquid phase refrigerant is in a distribution cloud picture of a section of y-0.

FIG. 7: and (5) a liquid-phase refrigerant trace diagram.

In FIGS. 1-5, 1 is the header; 2-a flow-collecting cavity; 3-drainage spacer; 4-flat tube; 7-flat tube end face; 8-diversion inclined holes.

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 present invention in any manner.

Example 1:

a uniform flow distribution microchannel heat exchanger as shown in fig. 1, comprising: the refrigerant collecting device comprises a collecting pipe 1, wherein the middle part of the collecting pipe 1 is provided with a collecting cavity 2 for guiding a refrigerant object; the drainage spacer 3 is connected inside the collecting pipe 1, communicated with the collecting cavity 2 and used for changing the running track of a refrigerant object into forward rotation to form stable circulation; the port is a circular arc flat tube 4, the flat tube 4 is positioned above the drainage spacer 3 and communicated with the flow collecting cavity 2, and the circular flow type refrigerant is combined to enable liquid refrigerant to enter uniformly and enable heat exchange to be uniform.

In the embodiment, the refrigerant object in a gas-liquid two-phase state is conveyed in a rotating manner through the drainage spacer, the liquid refrigerant object is thrown to the pipe wall due to overlarge inertia because of the centrifugal force generated by rotation, and moves forwards spirally near the pipe wall, the gas refrigerant has small inertia and flows in the center of the pipe to form stable circulation; in the stable circulation, the liquid refrigerant uniformly enters the flat tubes, so that the whole heat exchanger is uniformly distributed, and the problem of nonuniform distribution of the liquid refrigerant entering the flat tubes due to unstable flow patterns is solved.

Specifically, as shown in fig. 1 to 5, in the microchannel heat exchanger with uniform flow distribution, a flow guide inclined hole 8 is arranged in the middle of the flow guide spacer 3, the flow guide inclined hole 8 is communicated with the flow collecting cavity 2, and an included angle β between an inclined open hole axis of the flow guide inclined hole 8 and a vertical axis of the flow guide spacer 3 is 20 to 60 degrees, so that a conveyed gas-liquid two-phase refrigerant body can quickly form a spiral rising state through the flow guide inclined hole, and preparation is made for a subsequent gas-liquid refrigerant body to uniformly enter the flat tube.

Specifically, at least four drainage inclined holes 8 are selected and arranged equidistantly with the circle center of the drainage spacer 3 as the center to form an annular inclined open hole group; the axes of the annular inclined open holes are distributed along the flowing direction in a circle center far away from the drainage spacer 3; the original gas-liquid state refrigerant object can be more rapidly formed into a spiral rising state through at least one circle of annularly arranged flow guide inclined holes, and further preparation is made for subsequent uniform flow distribution conveying.

Specifically, the thickness of the flow guide partition 3 is greater than or equal to 5mm, so that the refrigerant can flow through the partition for a longer time, the refrigerant obtains more momentum, and the rotational flow is formed more favorably.

Specifically, the flat tube end face 7 between the flat tube 4 and the collecting pipe 1 is arc-shaped and parallel to the inner wall face of the collecting pipe 1, and the distances between the end face and the inner wall face are equal, so that the uniform distribution is guaranteed.

Specifically, the distance between the end face of the flat pipe 4 extending into the collecting pipe 1 and the inner wall surface of the collecting pipe 1 is less than or equal to 3 mm.

Simplified simulation of the two flat tubes is performed on the above embodiment, and as seen from a liquid refrigerant distribution cloud graph (fig. 6) with a section y being 0, a large number of liquid-phase refrigerants are distributed on the circumference of the collecting pipe, and the liquid refrigerants entering the two flat tubes are relatively uniformly distributed;

from the trace diagram of the liquid-phase refrigerant in the collecting pipe, the liquid-phase refrigerant enters the collecting pipe cavity through the inclined circular pipe and then spirally rises, and is more distributed at the periphery and the position far away from the axis, so that the liquid-phase refrigerant can uniformly enter the flat pipe.

An air conditioning unit comprises the micro-channel heat exchanger with uniform flow distribution in the embodiment.

In the description of the present invention, it is to be understood that the terms "center", "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 indicate the orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings and the terms "first", "second", only for the convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. 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 (8)

1. A uniform flow distribution microchannel heat exchanger, comprising:

the middle part of the collecting pipe is provided with a collecting cavity which is used for guiding a refrigerant object;

the flow guide spacer is connected inside the collecting pipe and communicated with the collecting cavity and is used for changing the running track of a refrigerant object into forward rotation to form stable circulation;

the port is an arc-shaped flat pipe, the flat pipe is positioned above the drainage spacer and communicated with the flow collecting cavity, and the annular flow type refrigerant is combined to enable liquid refrigerant to uniformly enter and enable heat exchange to be uniform.

2. The micro-channel heat exchanger with uniform flow distribution as claimed in claim 1, wherein the middle part of the flow guide spacer is provided with a flow guide inclined hole, the flow guide inclined hole is communicated with the flow collection cavity, and an included angle β between an inclined opening axis of the flow guide inclined hole and a vertical axis of the flow guide spacer is 20-60 degrees.

3. The microchannel heat exchanger of claim 2, wherein the flow guiding inclined holes are arranged in an annular inclined opening group with the center of the flow guiding partition as the center at equal intervals.

4. The microchannel heat exchanger of claim 3, wherein the annular inclined open hole group has 1 or more turns, and the radii of the centers of the partition plates are uniformly distributed with different radiuses.

5. The uniform-flow-splitting microchannel heat exchanger of claim 1, wherein the thickness of the flow-directing spacer is greater than or equal to 5 mm.

6. The micro-channel heat exchanger with uniform flow distribution as recited in claim 1, wherein the end surface of the flat tube inserted into the collecting pipe is arc-shaped and parallel to the inner wall surface of the collecting pipe.

7. The micro-channel heat exchanger with uniform flow distribution as recited in claim 6, wherein the distance between the end surface of the flat pipe extending into the collecting main and the inner wall surface of the collecting main is less than or equal to 3 mm.

8. An air conditioning assembly comprising a uniformly divided microchannel heat exchanger as claimed in any one of claims 1 to 7.

Images