CN215373022U - CO2 transcritical barrel pump supplies liquid refrigerating unit oil return system - Google Patents
CO2 transcritical barrel pump supplies liquid refrigerating unit oil return system Download PDFInfo
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- CN215373022U CN215373022U CN202121848160.3U CN202121848160U CN215373022U CN 215373022 U CN215373022 U CN 215373022U CN 202121848160 U CN202121848160 U CN 202121848160U CN 215373022 U CN215373022 U CN 215373022U
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Abstract
The utility model provides a CO2 transcritical barrel pump liquid supply refrigerating unit oil return system, which is characterized by comprising: the system comprises a gas circulation system, a liquid circulation system and an oil return system, wherein the gas circulation system comprises a high-pressure stage compressor, an air cooler, an ejector, a flash tank and a high-pressure stage compressor air suction heat regenerator; the liquid circulation system comprises a low-pressure circulation barrel, the ejector, the flash tank and the high-pressure stage compressor air suction heat regenerator; the oil return system comprises an oil tank and an oil return plate, and the utility model mainly utilizes a transcritical injection refrigeration technology and an oil return system, thereby playing the roles of improving the COP of the system, and having high efficiency and energy saving.
Description
Technical Field
The utility model relates to the technical field of injection refrigeration, in particular to an oil return system of a CO2 trans-critical barrel pump liquid supply refrigeration unit.
Background
With the rapid development of the freezing and refrigerating industry and the influence of CFCs on the ozone layer and the atmospheric warming, in response to the industrial concept of green development, a refrigeration device using carbon dioxide as a refrigerant gradually becomes an industrial trend. However, in the past, most of the refrigeration systems using CO2 have been used as cooling systems, and it is also necessary to use them together with a refrigerant containing fluorine. The utility model discloses a design of an oil return system of a CO2 transcritical barrel pump liquid supply refrigerating unit, and provides a design method of the oil return system of a CO2 transcritical refrigerating system, because the whole refrigerating cycle uses CO2 as a refrigerant, a compressor runs in a transcritical state for a long time, and the safety and stability of the running of the whole system can be ensured only by the good oil supply performance of the unit, and thus the utility model provides the design method of the oil return system of the CO2 transcritical refrigerating system. Therefore, the oil return system of the CO2 trans-critical barrel pump liquid supply refrigerating unit needs to be designed.
SUMMERY OF THE UTILITY MODEL
According to the technical problem provided by the patent, a CO2 transcritical barrel pump liquid supply refrigerating unit oil return system is provided. The utility model mainly utilizes a transcritical injection refrigeration technology and an oil return system, and plays the roles of improving the COP of the system, high efficiency and energy saving. The technical means adopted by the utility model are as follows:
a CO2 transcritical barrel pump feed refrigeration unit oil return system, comprising: the system comprises a gas circulation system, a liquid circulation system and an oil return system, wherein the gas circulation system comprises a high-pressure-stage compressor, an air cooler, an ejector, a flash tank and a high-pressure-stage compressor air-suction heat regenerator, the output end of the high-pressure-stage compressor is connected with the input end of the air cooler through a pipeline, the output end of the air cooler is connected with the input end I of the ejector, the output end of the ejector is connected with the input end of the flash tank, a gas output port of the flash tank is connected with the gas input end of the high-pressure-stage compressor air-suction heat regenerator, and the gas output end of the high-pressure-stage compressor air-suction heat regenerator is connected with the input end of the high-pressure-stage compressor; the liquid circulation system comprises a low-pressure circulation barrel, the ejector, the flash tank and the high-pressure stage compressor air-suction heat regenerator, the output end of the low-pressure circulation barrel is connected with the input end II of the ejector, and the liquid output end of the high-pressure stage compressor air-suction heat regenerator is connected with the input end of the low-pressure circulation barrel; the oil return system comprises an oil tank and an oil return plate, the oil tank is connected with the high-pressure compressor, a gas input end of the oil return plate is arranged between the air cooler and the ejector through a pipeline, a gas output end of the oil return plate is arranged between a gas input end pipeline of the oil return plate and the ejector through a pipeline, a liquid phase input end of the oil return plate is connected with a liquid outlet end of the low-pressure circulating barrel, and a liquid phase output end of the oil return plate is connected with a gas input end of the high-pressure compressor air suction heat regenerator.
Furthermore, a parallel-stage compressor is arranged in the gas circulation system, the parallel-stage compressor is arranged between a gas output port of the flash tank and an input end of the gas cooler, and an oil inlet end of the parallel-stage compressor is connected with the oil tank; the rear end of the parallel stage compressor is provided with a parallel stage oil separator, the rear end of the high-pressure stage compressor is provided with a high-pressure stage oil separator, and the parallel stage oil separator and the high-pressure stage oil separator are connected with the oil tank.
Further, the gas output end of the low-pressure circulating barrel is connected with the gas input end of the high-pressure stage compressor air suction heat regenerator, and the low-pressure circulating barrel is injected with liquid-phase refrigerant through a liquid supply pump and a standby liquid supply pump.
Further, a throttle valve is arranged between the high-pressure stage compressor air suction heat regenerator and the low-pressure circulating barrel.
The utility model has the following advantages:
1. the CO2 transcritical barrel pump liquid supply refrigerating unit oil return system provided by the utility model adopts a transcritical injection refrigeration technology, improves the COP of the system, and is efficient and energy-saving; the CO2 refrigerant is adopted, so that the environment is protected, and the industrial development concept is met; the design of the oil return system adopts a physical scheme, and no damage is caused to the system. Based on the reasons, the utility model can be widely popularized in the fields of injection refrigeration technology and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that 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 these drawings without creative efforts.
Fig. 1 is a flow chart of a refrigerant loop of a CO2 transcritical barrel pump liquid supply refrigerating unit oil return system of the present invention.
In the figure: 1. a high pressure stage compressor; 2. a parallel stage compressor; 3. a high pressure stage oil separator; 4. a parallel stage oil separator; 5. an air cooler; 6. an ejector; 7. a low pressure recycle bin; 8. a liquid supply pump; 9. a standby liquid supply pump; 10. a throttle valve; 11. a high-pressure stage compressor suction heat regenerator; 12. a flash tank; 13. an oil tank; 14. an oil return plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a CO2 transcritical barrel pump feed liquid refrigeration unit oil return system, comprising: the system comprises a gas circulation system and a liquid circulation system, wherein the gas circulation system comprises a high-pressure stage compressor 1, a gas cooler 5, an ejector 6, a flash tank 12 and a high-pressure stage compressor air-breathing heat regenerator 11, the output end of the high-pressure stage compressor 1 is connected with the input end of the gas cooler 5 through a pipeline, the output end of the gas cooler 5 is connected with the input end I of the ejector 6, the output end of the ejector 6 is connected with the input port of the flash tank 12, the gas output port of the flash tank 12 is connected with the gas input end of the high-pressure stage compressor air-breathing heat regenerator 11, and the gas output end of the high-pressure stage compressor air-breathing heat regenerator 11 is connected with the input end of the high-pressure stage compressor 1; the liquid circulation system comprises a low-pressure circulation barrel 7, the ejector 6, the flash tank 12 and the high-pressure stage compressor air suction heat regenerator 11, the output end of the low-pressure circulating barrel 7 is connected with the input end II of the ejector 6, the liquid output end of the high-pressure stage compressor air-breathing heat regenerator 11 is connected with the input end of the low-pressure circulating barrel 7, the oil return system comprises an oil tank 13 and an oil return plate 14, the oil tank 3 is connected with the high-pressure stage compressor, the gas input end of the oil return plate 14 is arranged between the air cooler 5 and the ejector 6 through a pipeline, the gas output end of the oil return plate 14 is arranged between the gas input end pipeline of the oil return plate 14 and the ejector 6 through a pipeline, the liquid phase input end of the oil return plate 14 is connected with the liquid outlet end of the low-pressure circulating barrel 7, and the liquid phase output end of the oil return plate 14 is connected with the gas input end of the high-pressure stage compressor air suction heat regenerator 11; a parallel-stage compressor 2 is arranged in the gas circulation system, the parallel-stage compressor 2 is arranged between a gas output port of the flash tank 12 and an input end of the gas cooler 5, and an oil inlet end of the parallel-stage compressor 2 is connected with the oil tank 13; a parallel-stage oil separator 4 is arranged at the rear end of the parallel-stage compressor 2, a high-pressure-stage oil separator 3 is arranged at the rear end of the high-pressure-stage compressor 1, and the parallel-stage oil separator 4 and the high-pressure-stage oil separator 3 are connected with the oil tank 13; the gas output end of the low-pressure circulating barrel 7 is connected with the gas input end of the high-pressure stage compressor air suction heat regenerator 11, and the low-pressure circulating barrel 7 is injected with liquid-phase refrigerant through a liquid supply pump 8 and a standby liquid supply pump 98; and a throttle valve 10 is arranged between the high-pressure stage compressor air suction heat regenerator 11 and the low-pressure circulating barrel 7.
Example 1
When the high-pressure oil separator works, firstly, a CO2 refrigerant is compressed to a high-temperature high-pressure state by the high-pressure stage compressor 1 and enters the high-pressure stage oil separator 3, the oil separator separates refrigeration oil in the refrigerant, the separated oil enters the oil tank and returns to the compressor, the separated high-temperature high-pressure refrigerant gas enters the air cooler 5 for cooling, the low-temperature high-pressure CO2 refrigerant enters the ejector 6, the ejected gas is introduced from the air cooler 5 and the low-pressure circulating barrel 7, the medium-pressure refrigerant formed after ejection enters the flash tank 12, the refrigerant is in a gas-liquid two-phase state, wherein the gaseous refrigerant is firstly sucked by the parallel compression parallel stage compressor 2 and compressed to a high-temperature high-pressure state and enters the high-pressure stage oil separator 4, the high-pressure stage oil separator 4 and the high-temperature high-pressure gas from the high-pressure stage oil separator 3 enter the air cooler 5 together after working to form a circulating system, and the other part and the gas from the low-pressure circulating barrel 7 pass through the high-pressure stage compressor suction heat regenerator 11 and then pass through the high-pressure stage compressor Sucking by the stage compressor 1 and entering the next cycle; liquid-phase refrigerant in the flash tank 12 passes through the high-pressure stage compressor air-suction heat regenerator 11, is throttled and depressurized by the throttle valve 10, and then enters the low-pressure circulating barrel 7, and the liquid-phase refrigerant in the low-pressure circulating barrel 7 enters the evaporation tail end by the liquid supply pump 8 and the standby liquid supply pump 9 to perform refrigeration work. The oil return system is designed to ensure that the oil return of the whole unit consists of two parts, firstly, oil separation work from the high-pressure-stage oil separator 3 and the parallel-stage oil separator 4 is carried out, the oil is stored back to the compressor by the oil tank 13, the refrigeration oil in the other part of the system is accumulated by the oil of the low-pressure circulating barrel 7, heat exchange and temperature rise are carried out between the refrigeration oil and a refrigerant passing through the air cooler through the oil return plate 14, the liquid refrigerant in the same loop is converted into a gas state and returns to the high-pressure-stage compressor 1 together with the refrigeration oil, and therefore the whole oil return work is completed.
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 the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A CO2 transcritical barrel pump feed refrigeration unit oil return system, comprising: the system comprises a gas circulation system, a liquid circulation system and an oil return system, wherein the gas circulation system comprises a high-pressure-stage compressor, an air cooler, an ejector, a flash tank and a high-pressure-stage compressor air-suction heat regenerator, the output end of the high-pressure-stage compressor is connected with the input end of the air cooler through a pipeline, the output end of the air cooler is connected with the input end I of the ejector, the output end of the ejector is connected with the input end of the flash tank, a gas output port of the flash tank is connected with the gas input end of the high-pressure-stage compressor air-suction heat regenerator, and the gas output end of the high-pressure-stage compressor air-suction heat regenerator is connected with the input end of the high-pressure-stage compressor; the liquid circulation system comprises a low-pressure circulation barrel, the ejector, the flash tank and the high-pressure stage compressor air-suction heat regenerator, the output end of the low-pressure circulation barrel is connected with the input end II of the ejector, and the liquid output end of the high-pressure stage compressor air-suction heat regenerator is connected with the input end of the low-pressure circulation barrel; the oil return system comprises an oil tank and an oil return plate, the oil tank is connected with the high-pressure compressor, a gas input end of the oil return plate is arranged between the air cooler and the ejector through a pipeline, a gas output end of the oil return plate is arranged between a gas input end pipeline of the oil return plate and the ejector through a pipeline, a liquid phase input end of the oil return plate is connected with a liquid outlet end of the low-pressure circulating barrel, and a liquid phase output end of the oil return plate is connected with a gas input end of the high-pressure compressor air suction heat regenerator.
2. The CO2 transcritical barrel pump feed refrigeration unit oil return system according to claim 1, wherein a parallel stage compressor is arranged in the gas circulation system, the parallel stage compressor is arranged between a gas outlet of the flash tank and an input end of the gas cooler, and an oil inlet end of the parallel stage compressor is connected with the oil tank; the rear end of the parallel stage compressor is provided with a parallel stage oil separator, the rear end of the high-pressure stage compressor is provided with a high-pressure stage oil separator, and the parallel stage oil separator and the high-pressure stage oil separator are connected with the oil tank.
3. The CO2 transcritical barrel pump feed refrigeration unit oil return system according to claim 2, wherein the gas output end of the low pressure circulation barrel is connected with the gas input end of the high pressure stage compressor suction heat regenerator, and the low pressure circulation barrel is injected with liquid phase refrigerant through a feed pump and a spare feed pump.
4. The CO2 transcritical drum pump feed refrigeration unit oil return system according to claim 3, wherein a throttle valve is provided between the high pressure stage compressor suction heat regenerator and the low pressure cycle drum.
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| CN202121848160.3U CN215373022U (en) | 2021-08-09 | 2021-08-09 | CO2 transcritical barrel pump supplies liquid refrigerating unit oil return system |
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| CN202121848160.3U CN215373022U (en) | 2021-08-09 | 2021-08-09 | CO2 transcritical barrel pump supplies liquid refrigerating unit oil return system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739072A (en) * | 2022-04-13 | 2022-07-12 | 天津大学 | Ice rink refrigerating system |
| CN114739071A (en) * | 2022-04-13 | 2022-07-12 | 天津大学 | Ice rink refrigeration plant and system |
| CN115014010A (en) * | 2022-06-09 | 2022-09-06 | 珠海格力电器股份有限公司 | Compression refrigeration system for fluorine pump |
| CN115200251A (en) * | 2022-07-15 | 2022-10-18 | 珠海格力电器股份有限公司 | Fluorine pump compression refrigeration system and control method thereof |
-
2021
- 2021-08-09 CN CN202121848160.3U patent/CN215373022U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739072A (en) * | 2022-04-13 | 2022-07-12 | 天津大学 | Ice rink refrigerating system |
| CN114739071A (en) * | 2022-04-13 | 2022-07-12 | 天津大学 | Ice rink refrigeration plant and system |
| CN115014010A (en) * | 2022-06-09 | 2022-09-06 | 珠海格力电器股份有限公司 | Compression refrigeration system for fluorine pump |
| CN115200251A (en) * | 2022-07-15 | 2022-10-18 | 珠海格力电器股份有限公司 | Fluorine pump compression refrigeration system and control method thereof |
| CN115200251B (en) * | 2022-07-15 | 2023-11-17 | 珠海格力电器股份有限公司 | Fluorine pump pressure refrigeration system and control method thereof |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Chushao Group Inventor after: Wu Zhengmao Inventor after: Yan Shudong Inventor after: Miao Changxin Inventor after: Li Jianhang Inventor before: Chushao Group Inventor before: Li Xuezhi Inventor before: Wu Zhengmao Inventor before: Yan Shudong Inventor before: Qu Jinhong |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 116600 No. 8 Songlan Street, Dalian Economic and Technological Development Zone, Liaoning Province Patentee after: Bingshan Songyang Refrigerator System (Dalian) Co.,Ltd. Address before: 116000 No.8 Songlan street, Jinzhou new district, Dalian City, Liaoning Province Patentee before: PANASONIC REFRIGERATOR SYSTEM (DALIAN) CO.,LTD. |