CN214470255U

CN214470255U - Micro-channel heat exchanger

Info

Publication number: CN214470255U
Application number: CN202120372492.2U
Authority: CN
Inventors: 贾鹏; 丁海涛; 王超; 魏晨晨; 邱旭; 李培方; 刘建鹏; 刘彦佐; ***
Original assignee: Beijing Building Materials Testing Academy Co ltd
Current assignee: Beijing Building Materials Inspection And Research Institute Co Ltd
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2021-10-22
Anticipated expiration: 2031-02-09

Abstract

The utility model provides a micro-channel heat exchanger, which comprises a first collecting pipe, a second collecting pipe, a flow divider and a plurality of flat pipes, wherein the first collecting pipe and the second collecting pipe are parallel to each other, and two ends of each flat pipe are correspondingly communicated with the first collecting pipe and the second collecting pipe respectively; a first clapboard and a second clapboard are respectively arranged in the first collecting pipe, and the first clapboard and the second clapboard divide the inner space of the first collecting pipe into an upper chamber, a middle chamber and a lower chamber; the upper chamber, the middle chamber and the lower chamber are respectively provided with an inlet, and the flow divider is respectively communicated with the three inlets. The utility model provides a microchannel heat exchanger can make the distribution of refrigerant more even, has increased effective heat transfer area, and then has improved the whole heat transfer performance of heat exchanger.

Description

Micro-channel heat exchanger

Technical Field

The utility model relates to a heat exchanger technical field especially relates to a microchannel heat exchanger.

Background

In the prior art, the heat exchanger usually has only one heat exchange unit, namely, the heat exchanger is integrally formed into a single flow path. However, in the case of a single-pass heat exchanger, when the heat exchanger is used as an evaporator, after a gas-liquid two-phase refrigerant enters a collecting pipe of the heat exchanger, the gas-liquid two-phase refrigerant is easily mixed unevenly due to the large volume of the collecting pipe, and gas-liquid separation occurs. Under the influence of gravity, the liquid-phase refrigerant has high density, can be concentrated on the lower side of the collecting pipe, and flows through the flat pipe communicated with the lower side of the collecting pipe to generate phase change so as to fully exchange heat. Because the density of the gas-phase refrigerant is smaller, the gas-phase refrigerant can be concentrated on the upper side of the collecting pipe, and then flows through the flat pipe communicated with the upper side of the collecting pipe to generate temperature difference heat exchange, so that the heat exchange is insufficient. Therefore, when the single-flow microchannel heat exchanger is used as an evaporator, the distribution of a gas-liquid two-phase refrigerant between flat pipes is extremely uneven, the effective heat exchange area is greatly reduced, namely the effective heat exchange area of the heat exchanger is mainly concentrated on the lower side of the heat exchanger, and the upper side of the heat exchanger cannot be fully utilized, so that the overall heat exchange performance of the heat exchanger is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a microchannel heat exchanger can increase effective heat transfer area, improves the whole heat transfer performance of heat exchanger.

The utility model provides a micro-channel heat exchanger, which comprises a first collecting pipe, a second collecting pipe, a flow divider and a plurality of flat pipes, wherein the first collecting pipe and the second collecting pipe are parallel to each other, and two ends of each flat pipe are correspondingly communicated with the first collecting pipe and the second collecting pipe respectively; a first clapboard and a second clapboard are respectively arranged in the first collecting pipe, and the first clapboard and the second clapboard divide the inner space of the first collecting pipe into an upper chamber, a middle chamber and a lower chamber; collecting pipe inlets are respectively formed in the upper chamber, the middle chamber and the lower chamber, and the flow divider is respectively communicated with the three collecting pipe inlets;

the flat pipes respectively comprise a first flat pipe correspondingly communicated with the upper chamber, a second flat pipe correspondingly communicated with the middle chamber and a third flat pipe correspondingly communicated with the lower chamber; the first flat pipes are sequentially arranged from top to bottom, the length of the first flat pipes extending into the first collecting pipe is gradually increased from top to bottom, and the lengths of the first flat pipes extending into the second collecting pipe are equal; the second flat pipes are sequentially arranged from top to bottom, the length of the second flat pipes extending into the first collecting pipe is gradually increased from top to bottom, and the lengths of the second flat pipes extending into the second collecting pipe are equal; each third flat pipe is arranged from top to bottom in sequence, the length of each third flat pipe extending into the first collecting pipe is gradually increased from top to bottom, and the length of each third flat pipe extending into the second collecting pipe is equal.

According to the utility model provides a pair of microchannel heat exchanger, each first flat pipe is parallel to each other, and each first flat pipe perpendicular to respectively first pressure manifold.

According to the utility model provides a pair of microchannel heat exchanger, each the flat pipe of second is parallel to each other, and each the flat pipe perpendicular to respectively of second first pressure manifold.

According to the utility model provides a pair of microchannel heat exchanger, each the flat pipe of third is parallel to each other, and each the flat pipe perpendicular to respectively of third the first pressure manifold.

According to the utility model provides a pair of microchannel heat exchanger, go up the cavity the volume of middle cavity with the volume of cavity equals down.

According to the utility model provides a pair of microchannel heat exchanger, the quantity of first flat pipe the quantity of the flat pipe of second with the quantity of the flat pipe of third all equals.

According to the utility model provides a pair of microchannel heat exchanger, the top of second pressure manifold is equipped with the pressure manifold export, the pressure manifold export with the second pressure manifold is linked together.

According to the utility model provides a microchannel heat exchanger, a shunt inlet and three shunt outlets are arranged on the shunt, and each shunt outlet is correspondingly connected with each collecting pipe inlet through a shunt pipeline; the inlet of the flow divider is connected with a main pipeline, and a throttle valve is arranged on the main pipeline.

According to the microchannel heat exchanger provided by the utility model, the distance between every two adjacent flat tubes is equal; fins are arranged between every two adjacent flat tubes, and the fins are provided with punched seams respectively.

According to the utility model provides a pair of microchannel heat exchanger, each the inside of flat pipe is equipped with a plurality of runners respectively, and is a plurality of the runner is followed the width direction interval of flat pipe sets up, and each the length extending direction of runner all with the length extending direction of flat pipe is unanimous.

The utility model provides an above-mentioned one or more technical scheme has one of following technological effect at least:

the utility model provides a microchannel heat exchanger, through set up first baffle and second baffle in first pressure manifold respectively, thereby separate the inner space of first pressure manifold into last cavity, middle cavity and lower cavity, thereby divide into three cavity with original cavity of first pressure manifold, the volume of each cavity reduces by a wide margin compared with the volume of original cavity, and the reduction of volume is favorable to gas-liquid two-phase refrigerant evenly mixed in each cavity, thereby make the liquid phase refrigerant can flow into the flat pipe of upside, the gas-liquid separation's that has solved the great lead to of original pressure manifold volume problem has been solved from this, the influence of gravity to the refrigerant distribution has been weakened; the upper chamber, the middle chamber and the lower chamber are respectively provided with the inlets, so that the flow divider is respectively communicated with the three inlets, and the gas-liquid two-phase refrigerant flowing into the microchannel heat exchanger can be divided by the flow divider, so that the gas-liquid two-phase refrigerant can be distributed into the three chambers, the problem of uneven flow when the gas-liquid two-phase refrigerant directly enters each chamber is solved, the microchannel heat exchanger forms three heat exchange units, each heat exchange unit can independently exchange heat, and the effective heat exchange area is increased; the length of each first flat pipe extending into the upper cavity is gradually increased from top to bottom, so that the resistance of the refrigerant flowing in the first flat pipe at the lower side can be increased, the flowing path of the liquid-phase refrigerant is changed, the liquid-phase refrigerant can exchange heat with the first flat pipe at the upper side in a circulating manner, the influence of gravity on the distribution of the refrigerant is further weakened, and the effective heat exchange area of the refrigerant in the first flat pipe is increased; the length of each second flat pipe extending into the middle cavity is gradually increased from top to bottom, so that the resistance of the refrigerant flowing in the second flat pipe positioned on the lower side can be increased, the flowing path of the liquid-phase refrigerant is changed, the liquid-phase refrigerant can flow and exchange heat with the second flat pipe positioned on the upper side, the influence of gravity on the distribution of the refrigerant is further weakened, and the effective heat exchange area of the refrigerant in the second flat pipe is increased; the length of stretching into in the cavity down through stretching into each third flat pipe is from last to crescent to can increase the resistance that the refrigerant flows in the third flat pipe that is located the downside, be used for changing the flow path of liquid phase refrigerant, make the liquid phase refrigerant can circulate the heat transfer with the third flat pipe that is located the upside, further weaken the influence of gravity to the refrigerant distribution, increase the effective heat transfer area of refrigerant in the flat pipe of third. Therefore, the utility model provides a microchannel heat exchanger can make the distribution of refrigerant more even, has increased effective heat transfer area, and then has improved the whole heat transfer performance of heat exchanger.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a microchannel heat exchanger provided by the present invention;

FIG. 2 is a schematic view of the arrangement of fins in the present invention;

fig. 3 is a schematic sectional view of the middle flat tube of the present invention.

Reference numerals:

1: a first header; 101: an upper chamber; 102: an intermediate chamber;

103: a lower chamber; 2: a second header; 3: a flow divider;

4: flat tubes; 401: a flow channel; 41: a first flat tube;

42: a second flat tube; 43: a third flat tube; 5: a first separator;

6: a second separator; 7: a shunt line; 8: a main pipeline;

9: a throttle valve; 10: an outlet of the collecting pipe; 11: a fin;

12: and (6) punching the seam.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Specific embodiments of the microchannel heat exchanger of the present invention will be described below with reference to fig. 1 to 3.

The utility model discloses microchannel heat exchanger, including first pressure manifold 1, second pressure manifold 2, shunt 3 and a plurality of flat pipe 4, first pressure manifold 1 and second pressure manifold 2 all are vertical to setting up to first pressure manifold 1 and second pressure manifold 2 are parallel to each other, and wherein each flat pipe 4 all is the level to setting up, and each flat pipe 4's both ends correspond the intercommunication with first pressure manifold 1, second pressure manifold 2 respectively.

The first header 1 is provided with a first partition plate 5 and a second partition plate 6, respectively, and the first partition plate 5 and the second partition plate 6 can partition the internal space of the first header 1 into an upper chamber 101, an intermediate chamber 102, and a lower chamber 103, which are independent of each other. That is, through set up first baffle 5 and second baffle 6 in first pressure manifold 1, thereby divide into three less cavity relatively with the original great cavity of first pressure manifold 1, the volume of each cavity reduces by a wide margin in the volume of original cavity, and the reduction of volume is favorable to the two-phase refrigerant of gas-liquid to mix in each cavity, thereby make the liquid phase refrigerant can flow in the flat pipe 4 of upside, the great gas-liquid separation's that leads to of original pressure manifold volume problem has been solved from this, the influence of gravity to the refrigerant distribution has been weakened.

Collecting main inlets are respectively arranged on the upper chamber 101, the middle chamber 102 and the lower chamber 103, and the flow divider 3 is respectively communicated with the three collecting main inlets. That is, the gas-liquid two-phase refrigerant can enter into each chamber after being divided by the flow divider 3, so that the gas-liquid two-phase refrigerant can be more uniformly distributed into the three chambers, and the problem of uneven flow when the gas-liquid two-phase refrigerant directly enters into each chamber is solved.

The flat tubes 4 respectively include a first flat tube 41 correspondingly communicated with the upper cavity 101, a second flat tube 42 correspondingly communicated with the middle cavity 102, and a third flat tube 43 correspondingly communicated with the lower cavity 103. The upper cavity 101 and each first flat tube 41 are communicated with each other to form a heat exchange unit, the middle cavity 102 and each second flat tube 42 are communicated with each other to form a heat exchange unit, and the lower cavity 103 and each third flat tube 43 are communicated with each other to form a heat exchange unit. That is, the microchannel heat exchanger forms three heat exchange units, and each heat exchange unit can independently exchange heat, so that the effective heat exchange area is increased.

Wherein, each first flat pipe 41 is arranged from last to down in proper order, and each first flat pipe 41 stretches into the length that reaches in the first pressure manifold 1 from last to down crescent, and each first flat pipe 41 stretches into the length that reaches in the second pressure manifold 2 and equals. That is, the length of each first flat tube 41 gradually increases from top to bottom. This kind of mode of setting of each first flat pipe 41 can increase the resistance that the refrigerant flowed in the first flat pipe 41 that is located the downside for change the flow path of liquid phase refrigerant, make the liquid phase refrigerant can circulate the heat transfer with the first flat pipe 41 that is located the upside, further weakened the influence of gravity to the refrigerant distribution, increased the effective heat transfer area of refrigerant in first flat pipe 41.

Wherein, each second flat pipe 42 is arranged from last to lower in proper order, and each second flat pipe 42 stretches into the length that reaches in the first pressure manifold 1 from last to increasing gradually down, and the length that each second flat pipe 42 stretched into in the second pressure manifold 2 equals. That is, the length of each second flat tube 42 gradually increases from top to bottom. The arrangement mode of each second flat tube 42 can increase the resistance of the refrigerant flowing in the second flat tube 42 positioned on the lower side, so that the flow path of the liquid-phase refrigerant can be changed, the liquid-phase refrigerant can exchange heat with the second flat tube 42 positioned on the upper side in a circulating manner, the influence of gravity on refrigerant distribution is further weakened, and the effective heat exchange area of the refrigerant in the second flat tube 42 is increased.

Wherein, each third flat pipe 43 arranges from last to down in proper order, and each third flat pipe 43 stretches into the length that reaches in the first pressure manifold 1 from last to increasing gradually down, and the length that each third flat pipe 43 stretched into in the second pressure manifold 2 equals. That is, the length of each third flat tube 43 gradually increases from top to bottom. The arrangement mode of the third flat tubes 43 can increase the flowing resistance of the refrigerant in the third flat tubes 43 positioned on the lower side, so that the flowing path of the liquid-phase refrigerant can be changed, the liquid-phase refrigerant can be communicated with the third flat tubes 43 positioned on the upper side for heat exchange, the influence of gravity on refrigerant distribution is further weakened, and the effective heat exchange area of the refrigerant in the third flat tubes 43 is increased.

Therefore, the utility model provides a microchannel heat exchanger can make the distribution of refrigerant more even, has increased effective heat transfer area, and then has improved the whole heat transfer performance of heat exchanger.

Specifically, the first flat tubes 41 are parallel to each other, and the first flat tubes 41 are perpendicular to the first collecting pipe 1. Each second flat pipe 42 is parallel to each other, and each second flat pipe 42 is perpendicular to the first pressure manifold 1 respectively. Each third flat pipe 43 is parallel to each other, and each third flat pipe 43 is perpendicular to first pressure manifold 1 respectively.

Specifically, the volume of the upper chamber 101, the volume of the middle chamber 102, and the volume of the lower chamber 103 are all equal. The number of the first flat tubes 41, the number of the second flat tubes 42 and the number of the third flat tubes 43 are equal. That is, the volumes of the three heat exchange units are all equal.

In some embodiments of the present invention, the flow divider 3 is provided with a flow divider inlet and three flow divider outlets, and each flow divider outlet is correspondingly connected to each flow collecting pipe inlet through the flow dividing pipeline 7. A main pipeline 8 is connected to the inlet of the flow divider, and a throttle valve 9 is arranged on the main pipeline 8. That is, the gas-liquid two-phase refrigerant enters the flow divider 3 through the main line 8 to be divided, wherein the gas-liquid two-phase refrigerant conveyed in the main line 8 can be throttle-controlled by the throttle valve 9.

In some embodiments of the present invention, the top of the second collecting pipe 2 is provided with a collecting pipe outlet 10, and the collecting pipe outlet 10 is communicated with the second collecting pipe 2. That is, the gas-liquid two-phase refrigerant flows out of the throttle valve 9, then is uniformly distributed by the distributor 3, and then flows into the corresponding three heat exchange units from the inlets of the three collecting pipes to perform heat exchange. The gaseous refrigerant having undergone sufficient heat exchange then flows into the second header 2, and flows out from the header outlet 10 at the upper end of the second header 2.

In some embodiments of the present invention, the distance between every two adjacent flat tubes 4 is equal. Fins 11 are respectively arranged between every two adjacent flat tubes 4, and the fins 11 are respectively provided with a seam punch 12, so that the purpose of heat transfer enhancement is achieved.

The utility model discloses an in some embodiments, the inside of each flat pipe 4 is equipped with a plurality of runners 401 respectively, and a plurality of runners 401 set up along flat pipe 4's width direction interval, and the length extending direction of each runner 401 all is unanimous with flat pipe 4's length extending direction to make the refrigerant flow through each runner 401.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A microchannel heat exchanger, characterized in that: the heat exchanger comprises a first collecting pipe, a second collecting pipe, a flow divider and a plurality of flat pipes, wherein the first collecting pipe and the second collecting pipe are parallel to each other, and two ends of each flat pipe are correspondingly communicated with the first collecting pipe and the second collecting pipe respectively; a first clapboard and a second clapboard are respectively arranged in the first collecting pipe, and the first clapboard and the second clapboard divide the inner space of the first collecting pipe into an upper chamber, a middle chamber and a lower chamber; collecting pipe inlets are respectively formed in the upper chamber, the middle chamber and the lower chamber, and the flow divider is respectively communicated with the three collecting pipe inlets;

2. The microchannel heat exchanger of claim 1, wherein: each first flat pipe is parallel to each other, and each first flat pipe is perpendicular to respectively first pressure manifold.

3. The microchannel heat exchanger of claim 1, wherein: each second flat pipe is parallel to each other, and each second flat pipe is perpendicular to respectively first pressure manifold.

4. The microchannel heat exchanger of claim 1, wherein: each third flat pipe is parallel to each other, and each third flat pipe is perpendicular to respectively first pressure manifold.

5. The microchannel heat exchanger of any one of claims 1 to 4, wherein: the volume of the upper chamber, the volume of the middle chamber and the volume of the lower chamber are all equal.

6. The microchannel heat exchanger of any one of claims 1 to 4, wherein: the number of the first flat tubes, the number of the second flat tubes and the number of the third flat tubes are equal.

7. The microchannel heat exchanger of any one of claims 1 to 4, wherein: and the top of the second collecting pipe is provided with a collecting pipe outlet which is communicated with the second collecting pipe.

8. The microchannel heat exchanger of any one of claims 1 to 4, wherein: the flow divider is provided with a flow divider inlet and three flow divider outlets, and each flow divider outlet is correspondingly connected with each collecting pipe inlet through a flow dividing pipeline; the inlet of the flow divider is connected with a main pipeline, and a throttle valve is arranged on the main pipeline.

9. The microchannel heat exchanger of any one of claims 1 to 4, wherein: the distance between every two adjacent flat pipes is equal; fins are arranged between every two adjacent flat tubes, and the fins are provided with punched seams respectively.

10. The microchannel heat exchanger of any one of claims 1 to 4, wherein: each the inside of flat pipe is equipped with a plurality of runners respectively, and is a plurality of the runner sets up along the width direction interval of flat pipe, and each the length extending direction of runner all with the length extending direction of flat pipe is unanimous.