CN110762902A - Micro-channel evaporator and air conditioning system - Google Patents
Micro-channel evaporator and air conditioning system Download PDFInfo
- Publication number
- CN110762902A CN110762902A CN201810836723.3A CN201810836723A CN110762902A CN 110762902 A CN110762902 A CN 110762902A CN 201810836723 A CN201810836723 A CN 201810836723A CN 110762902 A CN110762902 A CN 110762902A
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- Prior art keywords
- flat tube
- flat
- shaped body
- group
- microchannel evaporator
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/37—Capillary tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/05—Cost reduction
Abstract
The invention relates to the technical field of refrigeration, and discloses a micro-channel evaporator and an air conditioning system, which are used for reducing production cost and improving refrigeration energy efficiency. The microchannel evaporator includes: the air conditioner comprises at least two flat pipe groups positioned at different air volume positions in an air conditioning system, wherein each flat pipe group comprises a liquid inlet collecting pipe, a liquid outlet collecting pipe and a group of flat pipes connected between the liquid inlet collecting pipe and the liquid outlet collecting pipe; the distributor comprises a liquid inlet and a liquid outlet corresponding to each flat tube group; capillary tubes respectively corresponding to the at least two flat tube groups, wherein each capillary tube is used for connecting the distribution tube of the corresponding flat tube group with the liquid outlet; the water tray is positioned at the bottoms of the at least two flat tube groups; wherein, the capillary corresponding to different flat tube groups selects different sizes according to different air volume at the position of the flat tube group.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a micro-channel evaporator and an air conditioning system.
Background
The inter-row air conditioner is applied to a modular machine room, mainly refrigerates in a mode of direct expansion through vapor compression, a refrigerant circulates in a closed pipeline formed by sequentially connecting a compressor, a condenser, a throttling element and an evaporator, and the specific process is as follows: the refrigerant is compressed into high-temperature high-pressure gas by a compressor and then enters a condenser, the high-temperature high-pressure gas is condensed in the condenser to generate heat to be low-temperature high-pressure liquid, the low-temperature high-pressure liquid is throttled by a throttling element to be low-temperature low-pressure liquid, then the low-temperature low-pressure liquid enters an evaporator to perform evaporation heat exchange, and the evaporated refrigerant gas returns to the compressor to complete one-time circulation. Among them, the evaporator of the air conditioner between the columns usually uses the more traditional copper tube finned evaporator.
As shown in fig. 1, the structure of the existing copper tube finned evaporator comprises heat exchange copper tubes 01 and fins coated on the outer surfaces of the heat exchange copper tubes, and in order to achieve a large heat exchange amount, the evaporator can be provided with a plurality of rows of heat exchange copper tubes 01, so that the production cost can be increased, and on the other hand, the heat exchange copper tubes 01 which are arranged densely can also increase the wind resistance to influence the heat exchange efficiency of the air conditioning unit.
Disclosure of Invention
The embodiment of the invention provides a micro-channel evaporator and an air conditioning system, which are used for reducing the production cost and improving the refrigeration energy efficiency.
The embodiment of the invention provides a micro-channel evaporator, which comprises:
the air conditioner comprises at least two flat pipe groups positioned at different air volume positions in an air conditioning system, wherein each flat pipe group comprises a liquid inlet collecting pipe, a liquid outlet collecting pipe and a group of flat pipes connected between the liquid inlet collecting pipe and the liquid outlet collecting pipe;
the distributor comprises a liquid inlet and a liquid outlet corresponding to each flat tube group;
capillary tubes respectively corresponding to the at least two flat tube groups, wherein each capillary tube is used for connecting the distribution tube of the corresponding flat tube group with the liquid outlet;
the water tray is positioned at the bottoms of the at least two flat tube groups;
wherein, the capillary corresponding to different flat tube groups selects different sizes according to different air volume at the position of the flat tube group.
In a specific embodiment, the inner diameters of the capillaries of the flat tube group at the position where the air volume is large are larger than the inner diameters of the capillaries of the flat tube group at the position where the air volume is small.
In a specific embodiment, the capillary length of the flat tube group at the position where the air volume is large is smaller than the capillary length of the flat tube group at the position where the air volume is small.
In a specific embodiment, for each flat tube group, the distribution density of the through holes on the distribution tube in the region with the larger air volume is less than the distribution density of the through holes on the distribution tube in the region with the smaller air volume.
In a specific embodiment, the number of the flat tube groups is two, and the two flat tube groups are arranged in a V-shaped body, and an opening of the V-shaped body forms an air outlet of the microchannel evaporator.
In a specific embodiment, the number of the flat tube groups is four, each two flat tube groups are respectively arranged in a first V-shaped body and a second V-shaped body, the second V-shaped body is stacked on the first V-shaped body, and an opening of the first V-shaped body and an opening of the second V-shaped body form an air outlet of the microchannel evaporator.
In a specific embodiment, the number of the water trays is two, and the two water trays are respectively a middle water tray and a lower water tray, the middle water tray is located between the second V-shaped body and the first V-shaped body, and the lower water tray is located at the bottom of the first V-shaped body.
In the embodiment of the invention, liquid refrigerant is fed into different flat tube groups through the capillary tubes connected with the liquid outlets of the distributor after entering the distributor, and because the air volume of the positions of the flat tube groups is different, the flow of the refrigerant actually entering the flat tube groups can be controlled by designing the capillary tubes corresponding to the flat tube groups into different sizes aiming at the different flat tube groups, so that the flow of the refrigerant in the flat tube groups at the positions with larger air volume can meet the heat exchange requirement of the refrigerant, and the waste caused by excessive refrigerant in the flat tube groups at the positions with smaller air volume is avoided.
The embodiment of the invention also provides an air conditioning system, which comprises a compressor, a condenser, a throttling element and the microchannel evaporator, wherein the compressor, the condenser, the throttling element and the microchannel evaporator are sequentially connected through pipelines to form closed circulation, the throttling element is connected with a liquid inlet of a distributor of the microchannel evaporator, and the compressor is connected with a liquid outlet collecting pipe of the microchannel evaporator. The air conditioning system has high refrigeration energy efficiency.
In a specific embodiment, the throttling element is an electronic expansion valve; alternatively, the throttling element is a thermostatic expansion valve.
Drawings
FIG. 1 is a schematic structural diagram of a copper tube finned evaporator in the prior art;
FIG. 2 is a schematic structural diagram of a microchannel evaporator according to an embodiment of the present invention.
Reference numerals:
the prior art comprises the following steps:
01-heat exchange copper pipe
The embodiment part of the invention is as follows:
10-flat pipe group 11-liquid inlet collecting pipe 12-liquid outlet collecting pipe 13-flat pipe
14-distribution pipe 20-distributor 21-liquid inlet 22-liquid outlet
30-capillary tube 40-water disk 15-first V-shaped body 16-second V-shaped body
41-middle water disk 42-lower water disk 50-throttling element
Detailed Description
In order to reduce production cost and improve refrigeration energy efficiency, the embodiment of the invention provides a micro-channel evaporator and an air conditioning system. In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
As shown in fig. 2, a microchannel evaporator according to an embodiment of the present invention includes:
at least two flat tube groups 10 located at different air volume positions in the air conditioning system, each flat tube group 10 comprising a liquid inlet collecting tube 11, a liquid outlet collecting tube 12 and a group of flat tubes 13 connected between the liquid inlet collecting tube 11 and the liquid outlet collecting tube 12, a distribution tube 14 inserted in the liquid inlet collecting tube 11, the distribution tube 14 having a plurality of through holes (not shown in the figure) along the axial direction;
a distributor 20 including a liquid inlet 21 and a liquid outlet 22 corresponding to each flat tube group 10;
a water tray 40 positioned at the bottom of the at least two flat tube groups 10;
the capillary tubes 30 corresponding to the different flat tube groups 10 are selected to have different sizes depending on the air volume at the positions of the flat tube groups 10.
When the microchannel evaporator works, liquid refrigerant enters the distribution pipe 14 through the capillary tube 30, is sprayed into the liquid inlet collecting pipe 11 through a through hole formed in the distribution pipe 14, and then flows to the liquid outlet collecting pipe 12 through the liquid inlet collecting pipe 11 and the flat tube 13; meanwhile, under the suction action of the fan positioned in front of the air outlet of the microchannel evaporator, external hot air passes through the flat tubes 13 of the microchannel evaporator and is subjected to heat exchange with liquid refrigerants in the flat tubes 13, condensed water is formed on the surfaces of the flat tubes 13, and the condensed water flows down along the surfaces of the flat tubes 13 under the action of gravity and is collected in the water pan 40 below the flat tube group 10. However, because the internal structure of the air conditioner cabinet is relatively compact, the air duct formed between the air outlet of the fan and the microchannel evaporator is inevitably obstructed by the pipeline or other structural members, which results in the difference of the air volume at the positions of the different flat tube groups 10, and at this time, if the refrigerant flow distributed to each flat tube group 10 is the same, not only the refrigerant flow in the flat tube group 10 at the position with larger air volume cannot meet the heat exchange requirement, but also the refrigerant in the flat tube group 10 at the position with smaller air volume is too much to cause waste, thereby affecting the refrigeration efficiency.
In the embodiment of the present invention, after entering the distributor 20, the liquid refrigerant is sent into different flat tube groups 10 through the capillary tubes 30 connected to the liquid outlets 22 of the distributor 20, and because the air volume at the position of each flat tube group 10 is different, for different flat tube groups 10, the flow rate of the refrigerant actually entering the flat tube group 10 can be controlled by designing the capillary tubes 30 corresponding to the different flat tube groups 10 to have different sizes, so that on one hand, the flow rate of the refrigerant in the flat tube group 10 at the position with a larger air volume can meet the heat exchange requirement thereof, and on the other hand, waste caused by too much refrigerant in the flat tube group 10 at the position with a smaller air volume is avoided.
The number of the flat tube groups is not limited, in a preferred embodiment of the invention, the number of the flat tube groups is two, the two flat tube groups are arranged in a V-shaped body, and the opening of the V-shaped body forms an air outlet of the microchannel evaporator.
Preferably, as shown in fig. 1, the number of the flat tube groups 10 is four, each two flat tube groups 10 are respectively arranged in a first V-shaped body 15 and a second V-shaped body 16, the second V-shaped body 16 is stacked on the first V-shaped body 15, and an opening of the first V-shaped body 15 and an opening of the second V-shaped body 16 form an air outlet of the microchannel evaporator.
In the microchannel evaporator of the above embodiment, a water tray 40 may be disposed below the first V-shaped body 15, so that the condensed water generated by the heat exchange between the first V-shaped body 15 and the second V-shaped body 16 can be collected in the water tray 40 under the action of gravity. In order to facilitate the drainage of the condensed water, in the preferred embodiment of the present invention, as shown in fig. 1, the number of the water trays 40 is two, that is, a reclaimed water tray 41 and a drain tray 42, the reclaimed water tray 41 is located between the second V-shaped body 16 and the first V-shaped body 15, and the drain tray 42 is located at the bottom of the first V-shaped body 15.
The water quantity passing through the capillary tube 30 is related to the inner diameter and the length thereof, and the smaller the inner diameter and/or the longer the length of the capillary tube 30 is, the larger the resistance is, and the smaller the refrigerant flow quantity passing through the capillary tube 30 is; conversely, the larger the inner diameter and/or the shorter the length of the capillary tube 30, the smaller the resistance, and the larger the refrigerant flow rate passing through the capillary tube 30. Therefore, in the embodiment of the invention, the flow rate of the refrigerant distributed to each flat tube group can be adjusted by changing the inner diameter and the length of the capillary tube corresponding to different flat tube groups. In a specific embodiment, the inner diameter of the capillary 30 of the flat tube group 10 at the position where the air volume is large is larger than the inner diameter of the capillary 30 of the flat tube group 10 at the position where the air volume is small; in another specific embodiment, the length of the capillary tube 30 of the flat tube group 10 at the position where the air volume is large is smaller than the length of the capillary tube 30 of the flat tube group 10 at the position where the air volume is small. It can be understood that, in the specific setting, the refrigerant flow rate can be adjusted by changing only one of the inner diameter or the length of the capillary tube 30, and certainly, the two parameters can also be changed at the same time for adjustment. It should be noted that the specific size of the capillary 30 needs to be designed according to the air volume in the air conditioning system where the flat tube group 10 is located, and details thereof are not described here.
Since the air volume is actually different for each flat tube group 10 at the positions where different regions of the flat tube group 10 are located, the refrigerant flow rates of the flat tubes 13 in different regions of the flat tube group 10 also need to be adjusted. In the process of implementing the present invention, the inventor finds that the distribution density of the through holes on the distribution pipe 14 affects the refrigerant flow rate fed into the flat pipe 13 by the collecting pipe 11, and specifically, the smaller the distribution density of the through holes on the distribution pipe 14, the more the refrigerant flow rate fed into the flat pipe 13 in the area with larger air volume by the collecting pipe 11, so that, in the embodiment of the present invention, for each flat pipe group 10, the distribution density of the through holes on the distribution pipe 14 in the area with larger air volume is smaller than the distribution density of the through holes on the distribution pipe 14 in the area with smaller air volume, so that the flat pipe 13 in the area with larger air volume of the flat pipe group 10 can distribute more refrigerants, and the heat exchange effect is ensured.
The embodiment of the present invention further provides an air conditioning system, including a compressor, a condenser, a throttling element 50 and a micro-channel evaporator according to any of the foregoing technical solutions, which are sequentially connected by a pipeline to form a closed cycle, wherein the throttling element 50 is connected to a liquid inlet 21 of a distributor 20 of the micro-channel evaporator, and the compressor is connected to a liquid outlet collecting pipe 12 of the micro-channel evaporator, wherein the throttling element 50 may be an electronic expansion valve or a thermal expansion valve, which is not limited in this respect. The air conditioning system has high refrigeration energy efficiency.
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 (9)
1. A microchannel evaporator, comprising:
the air conditioner comprises at least two flat pipe groups positioned at different air volume positions in an air conditioning system, wherein each flat pipe group comprises a liquid inlet collecting pipe, a liquid outlet collecting pipe and a group of flat pipes connected between the liquid inlet collecting pipe and the liquid outlet collecting pipe;
the distributor comprises a liquid inlet and a liquid outlet corresponding to each flat tube group;
capillary tubes respectively corresponding to the at least two flat tube groups, wherein each capillary tube is used for connecting the distribution tube of the corresponding flat tube group with the liquid outlet;
the water tray is positioned at the bottoms of the at least two flat tube groups;
wherein, the capillary corresponding to different flat tube groups selects different sizes according to different air volume at the position of the flat tube group.
2. The microchannel evaporator of claim 1, wherein the inner diameters of the capillaries of the flat tube group at a position where the air flow rate is large are larger than the inner diameters of the capillaries of the flat tube group at a position where the air flow rate is small.
3. The microchannel evaporator of claim 1, wherein the length of the capillaries of the flat tube group at a location where the air volume is large is smaller than the length of the capillaries of the flat tube group at a location where the air volume is small.
4. The microchannel evaporator of claim 1, wherein for each of the flat tube groups, the distribution density of the openings in the distribution tube in the region of greater air flow is less than the distribution density of the openings in the distribution tube in the region of lesser air flow.
5. The microchannel evaporator of claim 1, wherein the number of flat tube groups is two, and the two flat tube groups are arranged in a V-shape, and an opening of the V-shape forms an air outlet of the microchannel evaporator.
6. The microchannel evaporator of claim 1, wherein the number of flat tube groups is four, each flat tube group having a first V-shaped body arrangement and a second V-shaped body arrangement, and the second V-shaped body arrangement is stacked on the first V-shaped body, and the openings of the first V-shaped body and the second V-shaped body form the outlet of the microchannel evaporator.
7. The microchannel evaporator of claim 6, wherein the number of water pans is two, a mid-water pan and a lower-water pan, the mid-water pan being located between the second V-shaped body and the first V-shaped body, the lower-water pan being located at the bottom of the first V-shaped body.
8. An air conditioning system, which is characterized by comprising a compressor, a condenser, a throttling element and the microchannel evaporator as claimed in any one of claims 1 to 7, wherein the compressor, the condenser and the throttling element are sequentially connected through pipelines to form a closed cycle, the throttling element is connected with a liquid inlet of a distributor of the microchannel evaporator, and the compressor is connected with a liquid outlet collecting pipe of the microchannel evaporator.
9. The air conditioning system of claim 8, wherein the throttling element is an electronic expansion valve; alternatively, the throttling element is a thermostatic expansion valve.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810836723.3A CN110762902A (en) | 2018-07-26 | 2018-07-26 | Micro-channel evaporator and air conditioning system |
| PCT/CN2019/086578 WO2020019828A1 (en) | 2018-07-26 | 2019-05-13 | Micro-channel evaporator and air-conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810836723.3A CN110762902A (en) | 2018-07-26 | 2018-07-26 | Micro-channel evaporator and air conditioning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110762902A true CN110762902A (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810836723.3A Pending CN110762902A (en) | 2018-07-26 | 2018-07-26 | Micro-channel evaporator and air conditioning system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110762902A (en) |
| WO (1) | WO2020019828A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111879035A (en) * | 2020-07-28 | 2020-11-03 | 西安交通大学 | Micro-channel evaporator and defrosting and re-frosting control method |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4506609B2 (en) * | 2005-08-08 | 2010-07-21 | 三菱電機株式会社 | Air conditioner and method of manufacturing air conditioner |
| CN102278908B (en) * | 2011-09-16 | 2013-06-26 | 四川长虹空调有限公司 | Microchannel heat exchanger |
| DE112013004284B4 (en) * | 2012-08-30 | 2022-11-24 | Shaoming Yu | Microchannel heat exchanger |
| WO2014181400A1 (en) * | 2013-05-08 | 2014-11-13 | 三菱電機株式会社 | Heat exchanger and refrigeration cycle device |
| CN103913019A (en) * | 2014-01-18 | 2014-07-09 | 胡洁 | High-performance micro-channel heat exchanger for refrigerating system |
| US10168083B2 (en) * | 2014-07-11 | 2019-01-01 | Hangzhou Sanhua Research Institute Co., Ltd. | Refrigeration system and heat exchanger thereof |
| CN204362491U (en) * | 2015-01-14 | 2015-05-27 | 北京雅驿欣科技有限公司 | Machine cabinet body and row between air-conditioning |
| CN204593813U (en) * | 2015-01-14 | 2015-08-26 | 深圳市艾特网能有限公司 | Between row heat exchanger of air conditioner and row between air-conditioning |
| CN206496415U (en) * | 2016-12-29 | 2017-09-15 | 艾尔维尔(上海)机房设备有限公司 | Air-conditioning between a kind of row of novel heat exchanger structure |
| CN208688035U (en) * | 2018-07-26 | 2019-04-02 | 维谛技术有限公司 | A kind of micro-channel evaporator and a kind of air-conditioning system |
-
2018
- 2018-07-26 CN CN201810836723.3A patent/CN110762902A/en active Pending
-
2019
- 2019-05-13 WO PCT/CN2019/086578 patent/WO2020019828A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111879035A (en) * | 2020-07-28 | 2020-11-03 | 西安交通大学 | Micro-channel evaporator and defrosting and re-frosting control method |
| CN111879035B (en) * | 2020-07-28 | 2021-05-28 | 西安交通大学 | Micro-channel evaporator and defrosting and re-frosting control method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020019828A1 (en) | 2020-01-30 |
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