Refrigeration system
View Patent ↗A refrigeration system includes a scroll compressor, which includes a housing with a low-pressure chamber, and a high-pressure chamber and an oil pool connected thereto, a first condenser, a second condenser and a heat exchange device; the housing is provided with a gas suction port, a liquid-spraying enthalpy increasing port, a first gas exhaust port and a first oil outlet; the first gas exhaust port is connected to the first condenser, one end of-the gas suction port is connected to the scroll compressor and the other end thereof is connected to the heat exchange device; the first oil outlet is connected to an inlet of the second condenser, and an outlet of the second condenser is connected to the liquid-spraying enthalpy increasing port, oil cooled by the second condenser provides cooling for the scroll compressor.
1 . A refrigeration system, which comprises: a scroll compressor ( 10 ), a first condenser ( 30 ), a second condenser ( 50 ) and a heat exchange device ( 40 );
wherein the scroll compressor ( 10 ) comprises a housing ( 100 ), and a low pressure chamber ( 110 ), a high pressure chamber ( 120 ) and an oil pool ( 130 ) which are disposed in the housing ( 100 ); wherein the high pressure chamber ( 120 ) is connected to the oil pool ( 130 );
the housing ( 100 ) is provided with a gas suction port ( 111 ), a liquid-spraying enthalpy increasing port ( 112 ), a first gas exhaust port ( 113 ) and a first oil outlet ( 114 ); wherein the first gas exhaust port ( 113 ) is configured to be connected to the first condenser ( 30 ) to convey condensed refrigerant to the heat exchange device ( 40 ), one end of the gas suction port ( 111 ) is connected to the scroll compressor ( 10 ), and the other end of the gas suction port ( 111 ) is connected to the heat exchange device ( 40 ), to absorb refrigerant that flows back after heat exchange by the heat exchange device ( 40 );
the first oil outlet ( 114 ) is connected to an inlet of the second condenser ( 50 ), and an outlet of the second condenser ( 50 ) is connected to the liquid-spraying enthalpy increasing port ( 112 ), oil cooled by the second condenser ( 50 ) provides cooling for the scroll compressor ( 10 );
wherein the refrigeration system further comprises an oil separator ( 20 ), which is provided between the first condenser ( 30 ) and the scroll compressor ( 10 ) and is provided with a first gas inlet ( 21 ), a first oil inlet ( 23 ), a second gas exhaust port ( 22 ), a second oil outlet ( 24 ) and a third oil outlet ( 25 );
the first gas exhaust port ( 113 ) of the housing ( 100 ) is connected to the first condenser ( 30 ) through the oil separator ( 20 ), which is configured to receive gas of refrigerant mixed with oil discharged from the scroll compressor ( 10 ) through the first gas inlet ( 21 );
the second gas exhaust port ( 22 ) of the oil separator ( 20 ) is connected to the first condenser ( 30 ), to discharge separated gas containing refrigerant to the first condenser ( 30 ), so that the first condenser ( 30 ) condenses the gas and conveys it to the heat exchange device ( 40 ) for heat exchange;
the first oil outlet ( 114 ) of the housing ( 100 ) is connected to the first oil inlet ( 23 ) of the oil separator ( 20 ), to maintain a stable liquid level in the oil pool ( 130 );
the liquid-spraying enthalpy increasing port ( 112 ) of the housing ( 100 ) is connected to the second condenser ( 50 ) through the oil separator ( 20 ), and then connected to the second oil outlet ( 24 ) to cause oil in the oil separator ( 20 ) to flow back into the scroll compressor ( 10 ) through the liquid-spraying enthalpy increasing port ( 112 ), so as to cool the scroll compressor ( 10 );
the third oil outlet ( 25 ) is configured to discharge excessive oil and gas of refrigerant in the oil separator ( 20 ) to convey them into the heat exchange device ( 40 ); a horizontal position of the third oil outlet ( 25 ) is higher than horizontal positions of the first oil inlet ( 23 ) and the second oil outlet ( 24 ) of the oil separator ( 20 ).
2 . The refrigeration system according to claim 1 , wherein a solenoid valve ( 60 ) is provided between the second oil outlet ( 24 ) and the liquid-spraying enthalpy increasing port ( 112 ), and is closed when the scroll compressor ( 10 ) stops operation.
3 . The refrigeration system according to claim 1 , wherein a float switch is provided in the oil separator ( 20 ); when a liquid level in the oil separator ( 20 ) is higher than that of the oil pool ( 130 ), the float switch opens the third oil outlet ( 25 );
when the liquid level in the oil separator ( 20 ) is equal to or lower than that of the oil pool ( 130 ), the float switch closes the third oil outlet ( 25 ).
4 . The refrigeration system according to claim 1 , wherein the refrigeration system further comprises a throttling device ( 70 ) disposed between the third oil outlet ( 25 ) and a subsequent-stage heat exchanger, when a liquid level in the oil separator ( 20 ) is higher than that of the oil pool ( 130 ), a pressure difference between the oil separator ( 20 ) and the throttling device ( 70 ) causes the excessive oil and refrigerant to be discharged through the third oil outlet ( 25 ).
5 . The refrigeration system according to claim 1 , wherein the heat exchange device ( 40 ) comprises N-stage heat exchangers and an evaporator ( 80 ), N is greater than or equal to 2, and the N-stage heat exchangers are connected in series, and each of the N-stage heat exchangers comprises a liquid inlet ( 414 ), a second gas inlet ( 411 ), a gas outlet ( 413 ) and a liquid outlet ( 412 ), wherein the liquid inlet ( 414 ) and the gas outlet ( 413 ) are connected between heat exchangers at every two adjacent stages, and the liquid outlet ( 412 ) and the second gas inlet ( 411 ) are connected between the heat exchangers at every two adjacent stages through a gas-liquid separator ( 46 ), and the third oil outlet ( 25 ) is connected to a liquid inlet ( 414 ) of a second-stage heat exchanger ( 42 ) through a pipeline, a liquid outlet ( 412 ) of an Nth-stage heat exchanger is connected to an inlet of the evaporator ( 80 ), and an outlet of the evaporator ( 80 ) is connected to a liquid inlet ( 414 ) of an (N−1)th-stage heat exchanger.
6 . The refrigeration system according to claim 2 , wherein the heat exchange device ( 40 ) comprises N-stage heat exchangers and an evaporator ( 80 ), N is greater than or equal to 2, and the N-stage heat exchangers are connected in series, and each of the N-stage heat exchangers comprises a liquid inlet ( 414 ), a second gas inlet ( 411 ), a gas outlet ( 413 ) and a liquid outlet ( 412 ), wherein the liquid inlet ( 414 ) and the gas outlet ( 413 ) are connected between heat exchangers at every two adjacent stages, and the liquid outlet ( 412 ) and the second gas inlet ( 411 ) are connected between the heat exchangers at every two adjacent stages through a gas-liquid separator ( 46 ), and the third oil outlet ( 25 ) is connected to a liquid inlet ( 414 ) of a second-stage heat exchanger ( 42 ) through a pipeline, a liquid outlet ( 412 ) of an Nth-stage heat exchanger is connected to an inlet of the evaporator ( 80 ), and an outlet of the evaporator ( 80 ) is connected to a liquid inlet ( 414 ) of an (N−1)th-stage heat exchanger.
7 . The refrigeration system according to claim 3 , wherein the heat exchange device ( 40 ) comprises N-stage heat exchangers and an evaporator ( 80 ), N is greater than or equal to 2, and the N-stage heat exchangers are connected in series, and each of the N-stage heat exchangers comprises a liquid inlet ( 414 ), a second gas inlet ( 411 ), a gas outlet ( 413 ) and a liquid outlet ( 412 ), wherein the liquid inlet ( 414 ) and the gas outlet ( 413 ) are connected between heat exchangers at every two adjacent stages, and the liquid outlet ( 412 ) and the second gas inlet ( 411 ) are connected between the heat exchangers at every two adjacent stages through a gas-liquid separator ( 46 ), and the third oil outlet ( 25 ) is connected to a liquid inlet ( 414 ) of a second-stage heat exchanger ( 42 ) through a pipeline, a liquid outlet ( 412 ) of an Nth-stage heat exchanger is connected to an inlet of the evaporator ( 80 ), and an outlet of the evaporator ( 80 ) is connected to a liquid inlet ( 414 ) of an (N−1)th-stage heat exchanger.
8 . The refrigeration system according to claim 4 , wherein the heat exchange device ( 40 ) comprises N-stage heat exchangers and an evaporator ( 80 ), N is greater than or equal to 2, and the N-stage heat exchangers are connected in series, and each of the N-stage heat exchangers comprises a liquid inlet ( 414 ), a second gas inlet ( 411 ), a gas outlet ( 413 ) and a liquid outlet ( 412 ), wherein the liquid inlet ( 414 ) and the gas outlet ( 413 ) are connected between heat exchangers at every two adjacent stages, and the liquid outlet ( 412 ) and the second gas inlet ( 411 ) are connected between the heat exchangers at every two adjacent stages through a gas-liquid separator ( 46 ), and the third oil outlet ( 25 ) is connected to a liquid inlet ( 414 ) of a second-stage heat exchanger ( 42 ) through a pipeline, a liquid outlet ( 412 ) of an Nth-stage heat exchanger is connected to an inlet of the evaporator ( 80 ), and an outlet of the evaporator ( 80 ) is connected to a liquid inlet ( 414 ) of an (N−1)th-stage heat exchanger.
9 . The refrigeration system according to claim 5 , wherein the refrigeration system further comprises a first temperature sensor ( 481 ) and a second temperature sensor ( 482 ), and the first temperature sensor ( 481 ) is disposed at a gas outlet ( 413 ) of the Nth-stage heat exchanger; the second temperature sensor ( 482 ) is disposed at an outlet pipeline of the evaporator ( 80 );
the scroll compressor ( 10 ) is a variable frequency scroll compressor ( 10 );
the refrigeration system further comprises a control system that: when in a pre-cooling state, controls the first temperature sensor ( 481 ) to collect a temperature of refrigerant between a liquid inlet ( 414 ) and the gas outlet ( 413 ) in the Nth-stage heat exchanger in real time, and reduces an operating frequency of the scroll compressor ( 10 ) when the temperature collected by first temperature sensor ( 481 ) reaches a first preset temperature; and when in a refrigeration operating state, controls the second temperature sensor ( 482 ) to collect a temperature of refrigerant output from the evaporator ( 80 ) in real time, and reduces the operating frequency of the scroll compressor ( 10 ) when the temperature collected by the second temperature sensor ( 482 ) reaches a second preset temperature.
10 . The refrigeration system according to claim 6 , wherein the refrigeration system further comprises a first temperature sensor ( 481 ) and a second temperature sensor ( 482 ), and the first temperature sensor ( 481 ) is disposed at a gas outlet ( 413 ) of the Nth-stage heat exchanger; the second temperature sensor ( 482 ) is disposed at an outlet pipeline of the evaporator ( 80 );
the scroll compressor ( 10 ) is a variable frequency scroll compressor ( 10 );
the refrigeration system further comprises a control system that: when in a pre-cooling state, controls the first temperature sensor ( 481 ) to collect a temperature of refrigerant between a liquid inlet ( 414 ) and the gas outlet ( 413 ) in the Nth-stage heat exchanger in real time, and reduces an operating frequency of the scroll compressor ( 10 ) when the temperature collected by first temperature sensor ( 481 ) reaches a first preset temperature; and when in a refrigeration operating state, controls the second temperature sensor ( 482 ) to collect a temperature of refrigerant output from the evaporator ( 80 ) in real time, and reduces the operating frequency of the scroll compressor ( 10 ) when the temperature collected by the second temperature sensor ( 482 ) reaches a second preset temperature.
11 . The refrigeration system according to claim 7 , wherein the refrigeration system further comprises a first temperature sensor ( 481 ) and a second temperature sensor ( 482 ), and the first temperature sensor ( 481 ) is disposed at a gas outlet ( 413 ) of the Nth-stage heat exchanger; the second temperature sensor ( 482 ) is disposed at an outlet pipeline of the evaporator ( 80 );
the scroll compressor ( 10 ) is a variable frequency scroll compressor ( 10 );
the refrigeration system further comprises a control system that: when in a pre-cooling state, controls the first temperature sensor ( 481 ) to collect a temperature of refrigerant between a liquid inlet ( 414 ) and the gas outlet ( 413 ) in the Nth-stage heat exchanger in real time, and reduces an operating frequency of the scroll compressor ( 10 ) when the temperature collected by first temperature sensor ( 481 ) reaches a first preset temperature; and when in a refrigeration operating state, controls the second temperature sensor ( 482 ) to collect a temperature of refrigerant output from the evaporator ( 80 ) in real time, and reduces the operating frequency of the scroll compressor ( 10 ) when the temperature collected by the second temperature sensor ( 482 ) reaches a second preset temperature.
12 . The refrigeration system according to claim 8 , wherein the refrigeration system further comprises a first temperature sensor ( 481 ) and a second temperature sensor ( 482 ), and the first temperature sensor ( 481 ) is disposed at a gas outlet ( 413 ) of the Nth-stage heat exchanger; the second temperature sensor ( 482 ) is disposed at an outlet pipeline of the evaporator ( 80 );
the scroll compressor ( 10 ) is a variable frequency scroll compressor ( 10 );
the refrigeration system further comprises a control system that: when in a pre-cooling state, controls the first temperature sensor ( 481 ) to collect a temperature of refrigerant between a liquid inlet ( 414 ) and the gas outlet ( 413 ) in the Nth-stage heat exchanger in real time, and reduces an operating frequency of the scroll compressor ( 10 ) when the temperature collected by first temperature sensor ( 481 ) reaches a first preset temperature; and when in a refrigeration operating state, controls the second temperature sensor ( 482 ) to collect a temperature of refrigerant output from the evaporator ( 80 ) in real time, and reduces the operating frequency of the scroll compressor ( 10 ) when the temperature collected by the second temperature sensor ( 482 ) reaches a second preset temperature.