US 12,072,127 B2
Refrigeration system and oil recovery method for the same
Zhen Guo, Shanghai (CN); Kai Deng, Shanghai (CN); Vishnu Sishtla, Palm Beach Gardens, FL (US); Yingqin Wu, Shanghai (CN); and Lei Yu, Shanghai (CN)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Filed by Carrier Corporation, Palm Beach Gardens, FL (US)
Filed on Jun. 7, 2022, as Appl. No. 17/834,052.
Claims priority of application No. 202110672368.2 (CN), filed on Jun. 17, 2021.
Prior Publication US 2022/0404077 A1, Dec. 22, 2022
Int. Cl. F25B 41/20 (2021.01); F25B 31/00 (2006.01); F25B 43/02 (2006.01); F25B 49/02 (2006.01)
CPC F25B 43/02 (2013.01) [F25B 31/004 (2013.01); F25B 41/20 (2021.01); F25B 49/02 (2013.01); F25B 2500/16 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A refrigeration system, comprising: a compressor, a condenser, a throttling device, and an evaporator, all of which are connected in sequence to form a cooling circuit, wherein the refrigeration system further comprises an oil recovery system comprising:
an operation chamber, which comprises a first port communicating with an oil-containing position in the refrigeration system through a first pipeline, and a second port communicating with a bearing chamber or a bearing lubrication pipeline of the compressor through a second pipeline; and
a main piston in the operation chamber, the main piston reciprocating in the operation chamber to perform an extraction stroke and a discharge stroke; wherein in the extraction stroke, an oil-containing refrigerant in the oil-containing position in the refrigeration system is extracted to the operation chamber; and in the discharge stroke, the oil-containing refrigerant in the operation chamber is delivered to the bearing chamber or the bearing lubrication pipeline of the compressor;
wherein the main piston is connected to a first side of a control piston through a connecting rod, there is a first control chamber at the first side of the control piston, and a second control chamber at a second side of the control piston; the first control chamber and the second control chamber are alternatively connected to a first pressure fluid source and a second pressure fluid source, and there is a pressure difference between the first pressure fluid source and the second pressure fluid source, thereby driving the control piston to reciprocate together with the main piston to perform the extraction stroke and the discharge stroke;
wherein the first pressure fluid source is from the evaporator, and the second pressure fluid source is from the condenser.