CN102121760A - Parallel flow air conditioner and processing method thereof - Google Patents
Parallel flow air conditioner and processing method thereof Download PDFInfo
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- CN102121760A CN102121760A CN 201110090270 CN201110090270A CN102121760A CN 102121760 A CN102121760 A CN 102121760A CN 201110090270 CN201110090270 CN 201110090270 CN 201110090270 A CN201110090270 A CN 201110090270A CN 102121760 A CN102121760 A CN 102121760A
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Abstract
The invention discloses a parallel flow air conditioner, comprising a compressor, a compressor muffler, a four-way valve, an indoor unit, a capillary tube assembly, a top tube of an upper fluid collection tube, an upper fluid collection tube, a flat heat exchange tube and a lower fluid collection tube, wherein a first end of the lower fluid collection tube is provided with a gas-liquid separator, the gas-liquid separator is connected with a check valve, the check valve and the first end of the upper fluid collection tube are connected with the same connector of the four-way valve in parallel. The invention also discloses a processing method of the parallel flow air conditioner. In the invention, the parallel flow technology is adopted, cooling and heating can be realized, and the problems that the flow distribution is uneven, the heat exchange efficiency is low, the volume is large and the cost is high can be solved.
Description
Technical field
The invention belongs to the air-conditioner technical field, be specifically related to a kind of air conditioner and processing method thereof of using parallel-flow heat exchanger, be used for domestic air conditioner, commercial air conditioner or other refrigeration plants.
Background technology
Parallel-flow heat exchanger is also referred to as micro-channel heat exchanger, has heat transfer efficiency height, compact conformation, low, in light weight, the low cost and other advantages of noise.Be taken as condenser and be widely used in air conditioning for automobiles, in recent years, also be used as the condenser of family expenses, especially commercial use air conditioner.
Parallel-flow heat exchanger adopts flat tube augmentation of heat transfer technology, is a kind of porous aluminum flat pipe heat exchanger, and its structure is to adopt louvered fin in air side, and refrigerant side adopts the multi-channel flat pipe of minor diameter, thereby the heat exchange of air side and refrigerant side is strengthened.Use in family expenses air-conditioner field, help improving efficiency, reduce refrigerant charge and alleviate unit weight, reduce the air-conditioner cost, compare with common copper pipe heat exchanger, make domestic air conditioner obtain bigger improvement at aspects such as performance, volume, weight, costs.
Because in refrigerated air-conditioning system, the cold-producing medium that enters evaporimeter is a gas-fluid two-phase mixture, be divided into multichannel usually and enter and absorb heat in the evaporimeter, liquid phase is evaporated to gas to realize the purpose of refrigeration.Can cold-producing medium two-phase fluid, particularly liquid wherein be assigned to uniformly and carry out heat exchange in each paths, are the keys of evaporator designs.Under the service condition of actual complex, if each flat heat exchanger tube separatory is uneven in the evaporimeter, can cause different tube refrigerant mass flow discrepancies even, the less very fast evaporation of flow in the pipe, the degree of superheat of pipeline outlet is higher; The too much evaporation of flow does not finish in the pipe, and it is little to cause exporting the degree of superheat, even contains liquid; Make all under two kinds of situations that flat heat exchanger tube heat exchange area is not in full use.In addition, the volume that accounts for owing to the gaseous refrigerant that enters flat heat exchanger tube is bigger, has occupied most space and heat exchange area, has had a strong impact on heat exchange efficiency, makes evaporimeter have to volume is done greatly, and cost improves.
In view of the foregoing, at present in the family expenses commercial use air conditioner, parallel-flow heat exchanger is only made condenser and is used on single-cooling air-conditioner, has limited it at the application development of commercial, domestic air conditioner with popularize.
Summary of the invention
The present invention provides a kind of concurrent flow air conditioner in order to overcome the deficiency that above prior art exists, and makes the concurrent flow technology can realize freezing and heating, and solves shunting inequality, problems such as heat exchange efficiency is low, volume is big, cost height.
Another object of the present invention is to provide a kind of processing method of concurrent flow air conditioner.
Purpose of the present invention realizes by following technical scheme: a kind of concurrent flow air conditioner, it is characterized in that: comprise compressor, the compressor return air pipe, cross valve, indoor set, capillary module, last collector tube upper pipes, last collector tube, flat heat exchanger tube and following collector tube, collector tube on described in the depression angle, following collector tube is " L " shape of circular arc bending, compressor, the compressor return air pipe connects two connectors of cross valve respectively, indoor set, last collector tube first end connects two other connector of cross valve respectively, indoor set connects by capillary module goes up the collector tube upper pipes, last collector tube upper pipes connects upward collector tube second end, last collector tube inside is provided with at least one dividing plate, the flat heat exchanger tube by a plurality of parallel arrangements is communicated with between the collector tube up and down, each flat heat exchanger tube has fin, following collector tube first end is provided with gas-liquid separator, gas-liquid separator connects check valve, the be connected in parallel same connector of cross valve of check valve and last collector tube first end.
According to different use occasions, the described collector tube inside of going up is provided with a dividing plate, and the concurrent flow air conditioner is 2 flow processs.
According to different use occasions, the described collector tube inside of going up is provided with two dividing plates, and following collector tube inside is provided with a dividing plate, and the concurrent flow air conditioner is 4 flow processs.
As a kind of preferred structure, described collector tube and the following collector tube horizontal positioned of going up, flat heat exchanger tube is vertically placed.
As a kind of preferred structure, the insertion depth of described flat heat exchanger tube in last collector tube is littler than the insertion depth of flat heat exchanger tube in following collector tube.
As a kind of preferred structure, described fin is corrugated V-arrangement fin.
The processing method of the concurrent flow air conditioner of 2 flow processs (principle of 4 flow processs is too) is characterized in that:
When refrigerating operaton: the gaseous refrigerant of HTHP is from compressor, enter collector tube first end through cross valve, flat heat exchanger tube through dividing plate the right arrives collector tube down again, gaseous refrigerant in the following collector tube, flat heat exchanger tube through the dividing plate left side arrives upward collector tube second end, bring out the cold-producing medium that comes from last collector tube second this moment and become the high-pressure gas-liquid two phase refrigerant, the collector tube upper pipes arrives capillary module on the process, capillary module becomes low-temp low-pressure gas-liquid two-phase cold-producing medium to the high-pressure gas-liquid two phase refrigerant, enter indoor set then, the heat exchange refrigeration, become low-pressure gaseous refrigerant, get back to the compressor return air pipe through cross valve, enter compressor at last, the continual circulation;
When heating operation: the cross valve commutation, the gaseous refrigerant of HTHP is from compressor, enter indoor set through cross valve, heat exchange heats, become the high-pressure gas-liquid two phase refrigerant, enter capillary module, capillary module becomes low-temp low-pressure gas-liquid two-phase cold-producing medium to the high-pressure gas-liquid two phase refrigerant, the collector tube upper pipes arrives and goes up collector tube second end on the process, flat heat exchanger tube through the dividing plate left side enters down collector tube, then shunt, gaseous refrigerant passes through gas-liquid separator, check valve, cross valve is got back to the compressor return air pipe, and liquid refrigerant carries out heat exchange through the flat heat exchanger tube on the right of the dividing plate and becomes gaseous refrigerant, gets back to the compressor return air pipe by cross valve then, enter compressor at last, the continual circulation.
When heating operation, described liquid refrigerant is through flat heat exchanger tube endothermic gasification, the outer fin of pipe produces condensation film, under the effect of gravity and air-conditioning fan wind-force, flow down to down the liquid collecting tube-surface along fin surface, by horizontal wind drive, all condensed waters are along collector tube nature water conservancy diversion eliminating down.
The present invention has following advantage with respect to prior art: this concurrent flow air conditioner makes the concurrent flow technology can realize refrigeration and heats, and solves shunting inequality, problems such as heat exchange efficiency is low, volume is big, cost height, and is specific as follows:
1, during heating operation of the present invention, for the 2 flow processs parallel-flow evaporator of (principle of 4 flow processs too), parallel stream flat heat exchanger tube distribute according to a certain percentage (position of dividing plate is greatly about 1/3 length place of last collector tube), when first flow process finishes, adopt gas-liquid separator, gaseous refrigerant is directly turned back to compressor by check valve, liquid refrigerant is assigned to uniformly in the flat heat exchanger tube in each road of second flow process and carries out heat exchange, the equal flow problem when having solved parallel-flow heat exchanger and making evaporimeter and use.The gaseous refrigerant dividing technology has improved the flow velocity of liquid refrigerant in the flat heat exchanger tube, and then has improved heat exchange efficiency greatly, significantly improves heating performance.
This concurrent flow air conditioner can both cooling and heating, simple in structure, shunting evenly, realized that parallel-flow heat exchanger is applied to air conditioner, made that the heating efficiency of air conditioner improves more than 30%, cost reduces more than 35%, the off-premises station volume reduces more than 25%.
2, the flat heat exchanger tube in microchannel is vertically placed, and is furnished with corrugated V-arrangement fin between flat tube, and every layer of fin and flat tube are at angle.In the air conditioner heat-production running, condensation film on the louvered fin under the effect of gravity and air-conditioning fan wind-force, flows down to down the liquid collecting tube-surface along fin surface, by horizontal wind drive, all condensed waters are along collector tube nature water conservancy diversion eliminating down.Thereby thoroughly solved the drainage problem when off-premises station adopts parallel-flow heat exchanger to make evaporimeter.
3, collector tube be horizontally placed on flat heat exchanger tube about, the flat heat exchanger tube in microchannel is vertically placed, last collector tube upper pipes is at the top of last collector tube, it is simple that the off-premises station pipeline is arranged, and saves the space, and, collector tube is made crooked shape up and down, make its complete with present copper pipe heat exchanger shape identical, do not need to change the off-premises station structure and directly replacement, save alternative costs greatly.
4, the insertion depth of flat heat exchanger tube in last collector tube is more shallow, just insert and go up the collector tube bottom, to guarantee the not residual liquid refrigerant in collector tube bottom, the insertion depth of flat heat exchanger tube in following collector tube is darker, during with the assurance heating operation, the gaseous refrigerant in the following collector tube can directly arrive the compressor return air pipe by gas-liquid separator and check valve.
Description of drawings
Fig. 1 is the vertical face figure of concurrent flow air conditioner of the present invention.
Fig. 2 is the vertical view of collector tube on 2 flow processs.
Fig. 3 is the 4 flow processs vertical face figure of collector tube up and down.
Label and title are as follows in Fig. 1～3:
| 1 | Flat |
2 | |
| 3 | Last collector tube upper pipes | 4 | Capillary module |
| 5 | |
6 | Last collector tube |
| 7 | Cross valve | 8 | Check valve |
| 9 | The compressor return air pipe | 10 | |
| 11 | Gas- |
12 | Following collector tube |
| 13 | Fin |
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment 1:
2 flow process concurrent flow air conditioners as shown in Figure 1, comprise compressor, the compressor return air pipe, cross valve, indoor set, capillary module, last collector tube upper pipes, last collector tube, flat heat exchanger tube and following collector tube, as shown in Figure 2, collector tube on described in the depression angle, following collector tube is " L " shape of circular arc bending, compressor, the compressor return air pipe connects two connectors of cross valve respectively, indoor set, last collector tube first end connects two other connector of cross valve respectively, indoor set connects by capillary module goes up the collector tube upper pipes, last collector tube upper pipes connects upward collector tube second end, last collector tube inside is provided with a dividing plate, the position of dividing plate is greatly about 1/3 length place of last collector tube, the flat heat exchanger tube by a plurality of parallel arrangements is communicated with between the collector tube up and down, flat heat exchanger tube about dividing plate respectively is a flow process, each flat heat exchanger tube has fin, following collector tube first end is provided with gas-liquid separator, gas-liquid separator connects check valve, the be connected in parallel same connector of cross valve of check valve and last collector tube first end.
Last collector tube and following collector tube horizontal positioned, flat heat exchanger tube is vertically placed.
The insertion depth of flat heat exchanger tube in last collector tube is littler than the insertion depth of flat heat exchanger tube in following collector tube.
Fin is corrugated V-arrangement fin.
The processing method of the concurrent flow air conditioner of 2 flow processs is as follows:
When refrigerating operaton: the gaseous refrigerant of HTHP is from compressor, enter collector tube first end through cross valve, flat heat exchanger tube through dividing plate the right arrives collector tube down again, gaseous refrigerant in the following collector tube, flat heat exchanger tube through the dividing plate left side arrives upward collector tube second end, bring out the cold-producing medium that comes from last collector tube second this moment and become the high-pressure gas-liquid two phase refrigerant, the collector tube upper pipes arrives capillary module on the process, capillary module becomes low-temp low-pressure gas-liquid two-phase cold-producing medium to the high-pressure gas-liquid two phase refrigerant, enter indoor set then, the heat exchange refrigeration, become low-pressure gaseous refrigerant, get back to the compressor return air pipe through cross valve, enter compressor at last, the continual circulation;
When heating operation: the cross valve commutation, the gaseous refrigerant of HTHP is from compressor, enter indoor set through cross valve, heat exchange heats, become the high-pressure gas-liquid two phase refrigerant, enter capillary module, capillary module becomes low-temp low-pressure gas-liquid two-phase cold-producing medium to the high-pressure gas-liquid two phase refrigerant, the collector tube upper pipes arrives and goes up collector tube second end on the process, flat heat exchanger tube through the dividing plate left side enters down collector tube, then shunt, gaseous refrigerant passes through gas-liquid separator, check valve, cross valve is got back to the compressor return air pipe, and liquid refrigerant carries out heat exchange through the flat heat exchanger tube on the right of the dividing plate and becomes gaseous refrigerant, gets back to the compressor return air pipe by cross valve then, enter compressor at last, the continual circulation.
When heating operation, described liquid refrigerant is through flat heat exchanger tube endothermic gasification, the outer fin of pipe produces condensation film, under the effect of gravity and air-conditioning fan wind-force, flow down to down the liquid collecting tube-surface along fin surface, by horizontal wind drive, all condensed waters are along collector tube nature water conservancy diversion eliminating down.
Embodiment 2:
As shown in Figure 3, last collector tube inside is provided with two dividing plates, following collector tube inside is provided with a dividing plate, the concurrent flow air conditioner is 4 flow processs, partition position is seen diagram, above the flat heat exchanger tube on the dividing plate left side, the left side be a flow process, above flat heat exchanger tube between left side dividing plate and the following dividing plate be a flow process, flat heat exchanger tube between following dividing plate and the top the right dividing plate is a flow process, above the flat heat exchanger tube on dividing plate the right, the right be a flow process.
The operation principle of the concurrent flow air conditioner of 4 flow processs and 2 flow processs basic identical.
The above-mentioned specific embodiment is the preferred embodiments of the present invention, can not limit the present invention, and other any change or other equivalent substitute mode that does not deviate from technical scheme of the present invention and made is included within protection scope of the present invention.
Claims (8)
1. concurrent flow air conditioner, it is characterized in that: comprise compressor, the compressor return air pipe, cross valve, indoor set, capillary module, last collector tube upper pipes, last collector tube, flat heat exchanger tube and following collector tube, collector tube on described in the depression angle, following collector tube is " L " shape of circular arc bending, compressor, the compressor return air pipe connects two connectors of cross valve respectively, indoor set, last collector tube first end connects two other connector of cross valve respectively, indoor set connects by capillary module goes up the collector tube upper pipes, last collector tube upper pipes connects upward collector tube second end, last collector tube inside is provided with at least one dividing plate, the flat heat exchanger tube by a plurality of parallel arrangements is communicated with between the collector tube up and down, each flat heat exchanger tube has fin, following collector tube first end is provided with gas-liquid separator, gas-liquid separator connects check valve, the be connected in parallel same connector of cross valve of check valve and last collector tube first end.
2. concurrent flow air conditioner according to claim 1 is characterized in that: the described collector tube inside of going up is provided with a dividing plate, and the concurrent flow air conditioner is 2 flow processs.
3. concurrent flow air conditioner according to claim 1 is characterized in that: the described collector tube inside of going up is provided with two dividing plates, and following collector tube inside is provided with a dividing plate, and the concurrent flow air conditioner is 4 flow processs.
4. concurrent flow air conditioner according to claim 1 is characterized in that: described collector tube and the following collector tube horizontal positioned of going up, flat heat exchanger tube is vertically placed.
5. concurrent flow air conditioner according to claim 4 is characterized in that: the insertion depth of described flat heat exchanger tube in last collector tube is littler than the insertion depth of flat heat exchanger tube in following collector tube.
6. concurrent flow air conditioner according to claim 1 is characterized in that: described fin is corrugated V-arrangement fin.
7. the processing method of concurrent flow air conditioner according to claim 2 is characterized in that:
When refrigerating operaton: the gaseous refrigerant of HTHP is from compressor, enter collector tube first end through cross valve, flat heat exchanger tube through dividing plate the right arrives collector tube down again, gaseous refrigerant in the following collector tube, flat heat exchanger tube through the dividing plate left side arrives upward collector tube second end, bring out the cold-producing medium that comes from last collector tube second this moment and become the high-pressure gas-liquid two phase refrigerant, the collector tube upper pipes arrives capillary module on the process, capillary module becomes low-temp low-pressure gas-liquid two-phase cold-producing medium to the high-pressure gas-liquid two phase refrigerant, enter indoor set then, the heat exchange refrigeration, become low-pressure gaseous refrigerant, get back to the compressor return air pipe through cross valve, enter compressor at last, the continual circulation;
When heating operation: the cross valve commutation, the gaseous refrigerant of HTHP is from compressor, enter indoor set through cross valve, heat exchange heats, become the high-pressure gas-liquid two phase refrigerant, enter capillary module, capillary module becomes low-temp low-pressure gas-liquid two-phase cold-producing medium to the high-pressure gas-liquid two phase refrigerant, the collector tube upper pipes arrives and goes up collector tube second end on the process, flat heat exchanger tube through the dividing plate left side enters down collector tube, then shunt, gaseous refrigerant passes through gas-liquid separator, check valve, cross valve is got back to the compressor return air pipe, and liquid refrigerant carries out heat exchange through the flat heat exchanger tube on the right of the dividing plate and becomes gaseous refrigerant, gets back to the compressor return air pipe by cross valve then, enter compressor at last, the continual circulation.
8. the processing method of concurrent flow air conditioner according to claim 7, it is characterized in that: when heating operation, described liquid refrigerant is through flat heat exchanger tube endothermic gasification, the outer fin of pipe produces condensation film, under the effect of gravity and air-conditioning fan wind-force, flow down to down the liquid collecting tube-surface along fin surface, by horizontal wind drive, all condensed waters are along collector tube nature water conservancy diversion eliminating down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100902702A CN102121760B (en) | 2011-04-12 | 2011-04-12 | Parallel flow air conditioner and processing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100902702A CN102121760B (en) | 2011-04-12 | 2011-04-12 | Parallel flow air conditioner and processing method thereof |
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| Publication Number | Publication Date |
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| CN102121760A true CN102121760A (en) | 2011-07-13 |
| CN102121760B CN102121760B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100902702A Expired - Fee Related CN102121760B (en) | 2011-04-12 | 2011-04-12 | Parallel flow air conditioner and processing method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103604254A (en) * | 2013-11-12 | 2014-02-26 | 清华大学 | Built-in gas-liquid flow distribution structure |
| CN103900164A (en) * | 2014-03-31 | 2014-07-02 | 华南理工大学 | Air-conditioning outdoor unit capable of reducing refrigerant charge and method implemented by air-conditioning outdoor unit |
| CN105066277A (en) * | 2015-07-31 | 2015-11-18 | 华南理工大学 | Air conditioner outdoor unit with refrigerant filling amount of lower portion liquid reduced and method of air conditioner outdoor unit |
| CN107965951A (en) * | 2016-10-19 | 2018-04-27 | 珠海格力电器股份有限公司 | Heat exchanger component and there is its container refrigeration unit |
| CN108266925A (en) * | 2016-12-30 | 2018-07-10 | 杭州三花微通道换热器有限公司 | Heat exchanger |
| CN106052214B (en) * | 2016-06-13 | 2018-07-17 | 上海交通大学 | Independent flow path heat pump type air conditioner system |
| CN109282537A (en) * | 2016-06-06 | 2019-01-29 | 珠海格力电器股份有限公司 | Heat exchanger and air conditioner |
| CN109489307A (en) * | 2018-12-04 | 2019-03-19 | 天津商业大学 | Double-flow micro-channel evaporator with double liquid supply pipes and air guide tubule |
| CN109631374A (en) * | 2018-12-04 | 2019-04-16 | 天津商业大学 | A kind of refrigeration system with novel double-flow micro-channel evaporator |
| CN110260416A (en) * | 2019-05-28 | 2019-09-20 | 青岛海信日立空调系统有限公司 | The control method of subregion heat exchanger assembly, air conditioner and subregion heat exchanger assembly |
| CN112686397A (en) * | 2020-12-18 | 2021-04-20 | 广东机电职业技术学院 | Air conditioner fault rate calculation method and device, computer equipment and storage medium |
| CN115200125A (en) * | 2022-09-15 | 2022-10-18 | 常兴集团有限公司 | High-efficient low temperature refrigeration air conditioning unit |
| WO2023040266A1 (en) * | 2021-09-19 | 2023-03-23 | 青岛海尔空调器有限总公司 | Heat exchanger, refrigeration circulation system and air conditioner |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604254B (en) * | 2013-11-12 | 2016-07-06 | 清华大学 | A kind of built-in biphase gas and liquid flow flow dividing structure |
| CN103604254A (en) * | 2013-11-12 | 2014-02-26 | 清华大学 | Built-in gas-liquid flow distribution structure |
| CN103900164A (en) * | 2014-03-31 | 2014-07-02 | 华南理工大学 | Air-conditioning outdoor unit capable of reducing refrigerant charge and method implemented by air-conditioning outdoor unit |
| CN105066277A (en) * | 2015-07-31 | 2015-11-18 | 华南理工大学 | Air conditioner outdoor unit with refrigerant filling amount of lower portion liquid reduced and method of air conditioner outdoor unit |
| CN109282537B (en) * | 2016-06-06 | 2019-10-29 | 珠海格力电器股份有限公司 | Heat exchanger and air conditioner |
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| CN106052214B (en) * | 2016-06-13 | 2018-07-17 | 上海交通大学 | Independent flow path heat pump type air conditioner system |
| CN107965951A (en) * | 2016-10-19 | 2018-04-27 | 珠海格力电器股份有限公司 | Heat exchanger component and there is its container refrigeration unit |
| CN107965951B (en) * | 2016-10-19 | 2023-10-27 | 珠海格力电器股份有限公司 | Heat exchanger component and container refrigerating unit with same |
| CN108266925A (en) * | 2016-12-30 | 2018-07-10 | 杭州三花微通道换热器有限公司 | Heat exchanger |
| CN108266925B (en) * | 2016-12-30 | 2021-05-18 | 杭州三花微通道换热器有限公司 | Heat exchanger |
| CN109489307A (en) * | 2018-12-04 | 2019-03-19 | 天津商业大学 | Double-flow micro-channel evaporator with double liquid supply pipes and air guide tubule |
| CN109631374A (en) * | 2018-12-04 | 2019-04-16 | 天津商业大学 | A kind of refrigeration system with novel double-flow micro-channel evaporator |
| CN110260416B (en) * | 2019-05-28 | 2021-04-16 | 青岛海信日立空调系统有限公司 | Partitioned heat exchanger assembly, air conditioner and control method of partitioned heat exchanger assembly |
| CN110260416A (en) * | 2019-05-28 | 2019-09-20 | 青岛海信日立空调系统有限公司 | The control method of subregion heat exchanger assembly, air conditioner and subregion heat exchanger assembly |
| CN112686397A (en) * | 2020-12-18 | 2021-04-20 | 广东机电职业技术学院 | Air conditioner fault rate calculation method and device, computer equipment and storage medium |
| WO2023040266A1 (en) * | 2021-09-19 | 2023-03-23 | 青岛海尔空调器有限总公司 | Heat exchanger, refrigeration circulation system and air conditioner |
| CN115200125A (en) * | 2022-09-15 | 2022-10-18 | 常兴集团有限公司 | High-efficient low temperature refrigeration air conditioning unit |
| CN115200125B (en) * | 2022-09-15 | 2022-11-18 | 常兴集团有限公司 | High-efficient low temperature refrigeration air conditioning unit |
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| CN102121760B (en) | 2012-07-04 |
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