CN110173951B - Method for preventing hot working medium from flowing reversely in liquid supply pipe during defrosting of air cooler - Google Patents
Method for preventing hot working medium from flowing reversely in liquid supply pipe during defrosting of air cooler Download PDFInfo
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- CN110173951B CN110173951B CN201910362423.0A CN201910362423A CN110173951B CN 110173951 B CN110173951 B CN 110173951B CN 201910362423 A CN201910362423 A CN 201910362423A CN 110173951 B CN110173951 B CN 110173951B
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- air cooler
- defrosting
- electromagnetic valve
- liquid supply
- hot working
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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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B41/31—Expansion valves
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/003—Filters
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/14—Collecting or removing condensed and defrost water; Drip trays
Abstract
The invention provides a method for preventing a hot working medium from flowing reversely in a liquid supply pipe during defrosting of an air cooler. The invention adds a pressurizing pipeline between the liquid supply pipeline and the hot working medium defrosting pipeline, the joint of the pressurizing pipeline and the liquid supply pipeline is positioned between the liquid supply electromagnetic valve and the thermostatic expansion valve, the joint of the pressurizing pipeline and the hot working medium defrosting pipeline is positioned between the gas filter and the defrosting electromagnetic valve, the pressurizing electromagnetic valve is arranged on the pressurizing pipeline to replace a check valve at the inlet side or the outlet side of the thermostatic expansion valve in the current engineering design, so as to prolong the service life and the working stability of the thermostatic expansion valve and improve the refrigerating effect of the air cooler and the operating performance of a refrigerating system.
Description
Technical Field
The invention relates to a method for preventing a hot working medium from flowing reversely in a liquid supply pipe during defrosting of an air cooler, which is used in a cold-chain logistics refrigerator.
Background
In the existing cold-chain logistics industry, due to the advantages of compact structure, high cooling speed and the like of an air cooler, the air cooler is widely applied to a cold-chain logistics cold storage, as shown in a Chinese patent with the application number of 201220124094. X. When the temperature of the outer surface of the air cooler fin is lower than 0 ℃, the heat transfer pipe of the air cooler and the outer surface of the fin can be frosted to form thermal resistance, so that the energy consumption coefficient of the refrigeration system is increased. In large and medium-sized low-temperature cold storage systems, defrosting of a hot working medium is a defrosting mode which is commonly adopted, and when defrosting of the hot working medium, in order to prevent the hot working medium from reversely flowing in a liquid supply pipeline and passing through a thermostatic expansion valve, a check valve is generally arranged on the inlet side or the outlet side of the thermostatic expansion valve. If a check valve is arranged at the inlet side of the thermostatic expansion valve, the hot working medium can reversely flow through the thermostatic expansion valve when defrosting, so that the working stability and the service life of the thermostatic expansion valve are influenced; if the check valve is arranged on the outlet side of the thermostatic expansion valve, the hot working medium cannot reversely flow through the thermostatic expansion valve when defrosting is carried out, but the check valve arranged on the outlet side of the thermostatic expansion valve can increase the resistance loss of two fluid refrigerants flowing out of the thermostatic expansion valve when the air cooler is used for normal refrigeration, so that the flow of the refrigerants can be reduced, the content of gas in refrigerant liquid can be increased, and the refrigeration effect of the air cooler and the operation performance of a refrigeration system are seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for preventing the reverse flow of a hot working medium in a liquid supply pipe during defrosting of an air cooler, wherein the hot working medium cannot reversely flow through a thermostatic expansion valve during defrosting of the hot working medium, and the refrigerating effect of the air cooler and the operating performance of a refrigerating system cannot be influenced during normal refrigeration.
The technical scheme adopted by the invention for solving the problems is as follows: a method for preventing the hot working medium from flowing back in the liquid supply pipe when the air cooler defrosts, there are liquid supply electromagnetic valve and thermal expansion valve on the liquid supply pipe that couples to liquid outlet pipe of air cooler and high-pressure liquid reservoir, there are gas filter, defrosting electromagnetic valve and defrosting check valve on the hot working medium defrosted pipe that couples to air outlet duct of air cooler and oil separator, there are air return electromagnetic valves on the air return pipe that couples to air inlet pipe of air cooler and air-liquid separator, there are flowing back overflow valves on the liquid discharge pipe that couples to air return pipe and liquid inlet pipe of the liquid discharge barrel;
the method is characterized in that: a pressurizing pipeline is additionally arranged between the liquid supply pipeline and the hot working medium defrosting pipeline, the joint of the pressurizing pipeline and the liquid supply pipeline is positioned between the liquid supply electromagnetic valve and the thermal expansion valve, and the joint of the pressurizing pipeline and the hot working medium defrosting pipeline is positioned between the gas filter and the defrosting electromagnetic valve; a pressurizing electromagnetic valve is arranged on the pressurizing pipeline;
the operation process of the air cooler is as follows: when the air cooler is normally cooled, the defrosting electromagnetic valve and the pressurizing electromagnetic valve are closed, the defrosting one-way valve and the liquid discharge overflow valve are closed, the liquid supply electromagnetic valve and the air return electromagnetic valve are opened, and the thermostatic expansion valve automatically adjusts the flow of the refrigerant according to the superheat degree of return air at the outlet of the air cooler; refrigerant liquid flowing out of a liquid outlet pipe of the high-pressure liquid reservoir sequentially enters a liquid supply electromagnetic valve and a thermal expansion valve through a liquid supply pipeline and then enters an air cooler, the throttled low-temperature and low-pressure refrigerant liquid absorbs heat in a coil pipe of the air cooler, boils and vaporizes into refrigerant gas, flows out of the air cooler and enters a gas-liquid separator through a gas return electromagnetic valve, and the refrigerant circularly flows in a phase change manner in the air cooler to achieve a refrigeration effect;
the hot working medium defrosting and draining process: when the air cooler is operated for a period of time, the outer surfaces of the heat transfer pipes and the fins of the air cooler are full of frost layers, and when defrosting is needed, firstly, the liquid supply electromagnetic valve is closed, the air cooler continues to operate for a period of time, the fan and the air return electromagnetic valve of the air cooler are closed in sequence, then the pressurizing electromagnetic valve is opened to lead the inlet of the thermostatic expansion valve to have defrosting pressure, after a period of time delay, then the defrosting electromagnetic valve is opened, the high-temperature hot working medium gas flowing out from the gas outlet pipe of the oil separator sequentially enters the gas filter, the defrosting electromagnetic valve and the defrosting check valve and then enters the air cooler, in the air cooler, high-temperature hot working medium gas in the coil exchanges frost heat outside the coil, the frost absorbs the heat and melts into water and flows out of a room through a frost melting drain pipe, the high-temperature hot working medium gas releases heat and then becomes refrigerant liquid, flows out of the air cooler, enters the air return pipeline, then enters the liquid discharge pipeline, and enters the liquid discharge barrel through the liquid discharge overflow valve;
the air cooler refrigerates the process again: after the hot working medium defrosting and draining lasts for a period of time, the defrosting electromagnetic valve and the pressurizing electromagnetic valve are closed in sequence, the air return electromagnetic valve is opened, the fan of the air cooler is started after a period of time, then the liquid supply electromagnetic valve is opened, the refrigerant passes through the liquid supply electromagnetic valve, the thermal expansion valve, the air cooler and the air return valve in sequence, and in the air cooler, the refrigerant liquid absorbs the heat in the cold room and starts refrigerating again to achieve the purpose of cooling the cold room.
When defrosting is needed, the air cooler continues to operate for 5-10 minutes after the liquid supply electromagnetic valve is closed.
After the defrosting pressure is formed at the inlet of the thermostatic expansion valve, the time is delayed for 3-10 seconds, and then a defrosting electromagnetic valve is opened.
After the hot working medium defrosting and draining lasts for 20-30 minutes, the defrosting electromagnetic valve and the pressurizing electromagnetic valve are closed in sequence.
After 3-5 minutes, the fan of the air cooler is started.
Compared with the prior art, the invention has the following advantages and effects: the added pressurizing pipeline and the pressurizing electromagnetic valve are utilized to replace a check valve on the inlet side or the outlet side of the thermal expansion valve on the liquid supply pipeline, so that the service life and the working stability of the thermal expansion valve can be prolonged, and the refrigeration effect of the air cooler and the operation performance of a refrigeration system are improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1, a method for preventing the backflow of hot working medium in a liquid supply pipe during defrosting of an air cooler, wherein a liquid supply solenoid valve 5 and a thermostatic expansion valve 6 are arranged on a liquid supply pipe 10 connected with an air cooler 1 and a liquid outlet pipe of a high-pressure liquid reservoir, a gas filter 3, a defrosting solenoid valve 2 and a defrosting check valve 7 are arranged on a hot working medium defrosting pipe 11 connected with the air cooler 1 and an air outlet pipe of an oil separator, an air return solenoid valve 9 is arranged on an air return pipe 13 connected with the air cooler 1 and an air inlet pipe of an air-liquid separator, and a liquid discharge overflow valve 8 is arranged on a liquid discharge pipe 14 connected with the air return pipe 13 and a liquid inlet pipe of a liquid discharge barrel; a pressurizing pipeline 12 is additionally arranged between a liquid supply pipeline 10 and a hot working medium defrosting pipeline 11, the joint of the pressurizing pipeline 12 and the liquid supply pipeline 10 is positioned between a liquid supply electromagnetic valve 5 and a thermostatic expansion valve 6, the joint of the pressurizing pipeline 12 and the hot working medium defrosting pipeline 11 is positioned between a gas filter 3 and a defrosting electromagnetic valve 2, and a pressurizing electromagnetic valve 4 with an automatic control function is arranged on the pressurizing pipeline 12 to replace a check valve on the inlet side or the outlet side of the thermostatic expansion valve 6 in the current engineering design, so that the service life and the working stability of the thermostatic expansion valve 6 are improved, and the refrigerating effect of an air cooler 1 and the operating performance of a refrigerating system are improved.
The operation process of the air cooler is as follows: when the air cooler 1 is normally cooled, the defrosting electromagnetic valve 2 and the pressurizing electromagnetic valve 4 are closed by means of electric signals, the defrosting one-way valve 7 and the liquid discharge overflow valve 8 are closed by means of pressure difference, the liquid supply electromagnetic valve 5 and the air return electromagnetic valve 9 are sequentially opened by means of electric signals, and the thermostatic expansion valve 6 automatically adjusts the flow of a refrigerant by means of the superheat degree of return air at the outlet of the air cooler 1; refrigerant liquid flowing out of a liquid outlet pipe of the high-pressure liquid reservoir sequentially enters a liquid supply electromagnetic valve 5 and a thermal expansion valve 6 through a liquid supply pipeline 10 and then enters the air cooler 1, the throttled low-temperature and low-pressure refrigerant liquid absorbs heat in a coil pipe of the air cooler 1, boils and vaporizes into refrigerant gas, flows out of the air cooler 1 and enters a gas return pipeline 13, then enters a gas-liquid separator through a gas return electromagnetic valve 9, and the refrigerant circularly flows in the air cooler 1 in a phase change manner to achieve a refrigeration effect.
The hot working medium defrosting and draining process: the air cooler 1 operates for a period of time, frost layers are fully formed on the outer surfaces of heat transfer pipes and fins of the air cooler 1, when defrosting is needed, the liquid supply electromagnetic valve 5 is firstly closed by means of electric signals, the air cooler 1 continues to operate for 5-10 minutes, and the air cooler fan and the air return electromagnetic valve 9 are sequentially closed; then the pressurizing electromagnetic valve 4 is opened by means of an electric signal, defrosting pressure is provided at the inlet of the thermostatic expansion valve 6, after 3-10 seconds of delay, the defrosting electromagnetic valve 2 is opened by means of the electric signal, high-temperature hot working medium gas flowing out of a branch pipe (hot working medium defrosting pipe) of an air outlet pipe of the oil separator sequentially enters the gas filter 3, the defrosting electromagnetic valve 2 and the defrosting one-way valve 7 and then enters the air cooler 1, the high-temperature hot working medium gas in the coil pipe exchanges heat with frost outside the coil pipe in the air cooler 1, the frost absorbs the heat to melt into water and then flows out of the room through a defrosting drain pipe, the high-temperature hot working medium gas releases heat to become refrigerant liquid, and flows out of the air cooler 1 to enter the overflow valve 13, then enters the drainage pipe 14 and enters the liquid discharge barrel through the.
The air cooler refrigerates the process again: after hot working medium defrosting and draining lasts for 20-30 minutes, the defrosting electromagnetic valve 2, the pressurizing electromagnetic valve 4 and the air return electromagnetic valve 9 are sequentially closed by means of electric signals, after 3-5 minutes, the fan of the air cooler 1 is started, the liquid supply electromagnetic valve 5 is opened by means of electric signals, the refrigerant sequentially passes through the liquid supply electromagnetic valve 5, the thermal expansion valve 6, the air cooler 1 and the air return valve 9, and in the air cooler 1, the refrigerant liquid absorbs heat in a cold room and starts refrigerating again to achieve the purpose of cooling the cold room.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (5)
1. A method for preventing the hot working medium from flowing back in the liquid supply pipe when the air cooler defrosts, there are liquid supply electromagnetic valve and thermal expansion valve on the liquid supply pipe that couples to liquid outlet pipe of air cooler and high-pressure liquid reservoir, there are gas filter, defrosting electromagnetic valve and defrosting check valve on the hot working medium defrosted pipe that couples to air outlet duct of air cooler and oil separator, there are air return electromagnetic valves on the air return pipe that couples to air inlet pipe of air cooler and air-liquid separator, there are flowing back overflow valves on the liquid discharge pipe that couples to air return pipe and liquid inlet pipe of the liquid discharge barrel;
the method is characterized in that: a pressurizing pipeline is additionally arranged between the liquid supply pipeline and the hot working medium defrosting pipeline, the joint of the pressurizing pipeline and the liquid supply pipeline is positioned between the liquid supply electromagnetic valve and the thermal expansion valve, and the joint of the pressurizing pipeline and the hot working medium defrosting pipeline is positioned between the gas filter and the defrosting electromagnetic valve; a pressurizing electromagnetic valve is arranged on the pressurizing pipeline;
the operation process of the air cooler is as follows: when the air cooler is normally cooled, the defrosting electromagnetic valve and the pressurizing electromagnetic valve are closed, the defrosting one-way valve and the liquid discharge overflow valve are closed, the liquid supply electromagnetic valve and the air return electromagnetic valve are opened, and the thermostatic expansion valve automatically adjusts the flow of the refrigerant according to the superheat degree of return air at the outlet of the air cooler; refrigerant liquid flowing out of a liquid outlet pipe of the high-pressure liquid reservoir sequentially enters a liquid supply electromagnetic valve and a thermal expansion valve through a liquid supply pipeline and then enters an air cooler, the throttled low-temperature and low-pressure refrigerant liquid absorbs heat in a coil pipe of the air cooler, boils and vaporizes into refrigerant gas, flows out of the air cooler and enters a gas-liquid separator through a gas return electromagnetic valve, and the refrigerant circularly flows in a phase change manner in the air cooler to achieve a refrigeration effect;
the hot working medium defrosting and draining process: when the air cooler is operated for a period of time, the outer surfaces of the heat transfer pipes and the fins of the air cooler are full of frost layers, and when defrosting is needed, firstly, the liquid supply electromagnetic valve is closed, the air cooler continues to operate for a period of time, the fan and the air return electromagnetic valve of the air cooler are closed in sequence, then the pressurizing electromagnetic valve is opened to lead the inlet of the thermostatic expansion valve to have defrosting pressure, after a period of time delay, then the defrosting electromagnetic valve is opened, the high-temperature hot working medium gas flowing out from the gas outlet pipe of the oil separator sequentially enters the gas filter, the defrosting electromagnetic valve and the defrosting check valve and then enters the air cooler, in the air cooler, high-temperature hot working medium gas in the coil exchanges frost heat outside the coil, the frost absorbs the heat and melts into water and flows out of a room through a frost melting drain pipe, the high-temperature hot working medium gas releases heat and then becomes refrigerant liquid, flows out of the air cooler, enters the air return pipeline, then enters the liquid discharge pipeline, and enters the liquid discharge barrel through the liquid discharge overflow valve;
the air cooler refrigerates the process again: after the hot working medium defrosting and draining lasts for a period of time, the defrosting electromagnetic valve and the pressurizing electromagnetic valve are closed in sequence, the air return electromagnetic valve is opened, the fan of the air cooler is started after a period of time, then the liquid supply electromagnetic valve is opened, the refrigerant passes through the liquid supply electromagnetic valve, the thermal expansion valve, the air cooler and the air return valve in sequence, and in the air cooler, the refrigerant liquid absorbs the heat in the cold room and starts refrigerating again to achieve the purpose of cooling the cold room.
2. The method of preventing backflow of a hot working fluid in a liquid supply tube during defrosting of an air cooler according to claim 1, wherein: and when defrosting is needed, the air cooler continues to operate for 5-10 minutes after the liquid supply electromagnetic valve is closed.
3. The method of preventing backflow of a hot working fluid in a liquid supply tube during defrosting of an air cooler according to claim 1, wherein: delaying for 3-10 seconds after the defrosting pressure is formed at the inlet of the thermostatic expansion valve, and then opening the defrosting electromagnetic valve.
4. The method of preventing backflow of a hot working fluid in a liquid supply tube during defrosting of an air cooler according to claim 1, wherein: and after the hot working medium defrosting and draining lasts for 20-30 minutes, closing the defrosting electromagnetic valve and the pressurizing electromagnetic valve in sequence.
5. The method of preventing backflow of a hot working fluid in a liquid supply tube during defrosting of an air cooler according to claim 1, wherein: and starting a fan of the air cooler after 3-5 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910362423.0A CN110173951B (en) | 2019-04-30 | 2019-04-30 | Method for preventing hot working medium from flowing reversely in liquid supply pipe during defrosting of air cooler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910362423.0A CN110173951B (en) | 2019-04-30 | 2019-04-30 | Method for preventing hot working medium from flowing reversely in liquid supply pipe during defrosting of air cooler |
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| CN110173951A CN110173951A (en) | 2019-08-27 |
| CN110173951B true CN110173951B (en) | 2021-01-19 |
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| CN204438647U (en) * | 2015-01-16 | 2015-07-01 | 上海盈翔制冷设备有限公司 | A kind of hot Freon defrosting system |
| CN204648783U (en) * | 2015-05-11 | 2015-09-16 | 浙江商业职业技术学院 | With the hot fluorine defrosting device of heat exchange gas-liquid separator |
| CN106369859A (en) * | 2016-10-31 | 2017-02-01 | 天津大学 | Multifunctional high-precision constant-temperature and constant-humidity control freezing and refrigerating system |
| CN205980492U (en) * | 2016-08-29 | 2017-02-22 | 烟台欧森纳地源空调股份有限公司 | Defrosting system |
| CN206739692U (en) * | 2016-11-01 | 2017-12-12 | 安徽美乐柯制冷空调设备有限公司 | A kind of defrosting and refrigeration system and freezer |
| CN206959398U (en) * | 2017-02-10 | 2018-02-02 | 济南大森制冷设备有限公司 | A kind of straight swollen refrigeration system with automatic hot air defrosting valve group |
| CN207907559U (en) * | 2018-01-16 | 2018-09-25 | 济南百福特制冷设备有限公司 | New and effective hot Freon defrosting system |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10103823A (en) * | 1996-09-30 | 1998-04-24 | Sanyo Electric Co Ltd | Icemaker |
| CN201926210U (en) * | 2011-01-07 | 2011-08-10 | 吴家伟 | Evaporator capable of realizing refrigerating and hot working medium defrosting simultaneously |
| CN203501573U (en) * | 2013-07-29 | 2014-03-26 | 广东省广弘食品集团有限公司 | Refrigeration system with hot-fluorine defrosting function |
| CN204254947U (en) * | 2014-10-31 | 2015-04-08 | 合肥美的暖通设备有限公司 | Air-conditioning system |
| CN204438647U (en) * | 2015-01-16 | 2015-07-01 | 上海盈翔制冷设备有限公司 | A kind of hot Freon defrosting system |
| CN204648783U (en) * | 2015-05-11 | 2015-09-16 | 浙江商业职业技术学院 | With the hot fluorine defrosting device of heat exchange gas-liquid separator |
| CN205980492U (en) * | 2016-08-29 | 2017-02-22 | 烟台欧森纳地源空调股份有限公司 | Defrosting system |
| CN106369859A (en) * | 2016-10-31 | 2017-02-01 | 天津大学 | Multifunctional high-precision constant-temperature and constant-humidity control freezing and refrigerating system |
| CN206739692U (en) * | 2016-11-01 | 2017-12-12 | 安徽美乐柯制冷空调设备有限公司 | A kind of defrosting and refrigeration system and freezer |
| CN206959398U (en) * | 2017-02-10 | 2018-02-02 | 济南大森制冷设备有限公司 | A kind of straight swollen refrigeration system with automatic hot air defrosting valve group |
| CN207907559U (en) * | 2018-01-16 | 2018-09-25 | 济南百福特制冷设备有限公司 | New and effective hot Freon defrosting system |
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| CN110173951A (en) | 2019-08-27 |
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