US 11,859,881 B2
Refrigeration system and control method therefor
Kai Deng, Shanghai (CN); and Vishnu Sishtla, Manlius, NY (US)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Filed by Carrier Corporation, Palm Beach Gardens, FL (US)
Filed on Dec. 18, 2020, as Appl. No. 17/127,018.
Claims priority of application No. 202010758250.7 (CN), filed on Jul. 31, 2020.
Prior Publication US 2022/0034560 A1, Feb. 3, 2022
Int. Cl. F25B 13/00 (2006.01); F25B 41/20 (2021.01); F25B 49/02 (2006.01)
CPC F25B 41/20 (2021.01) [F25B 13/00 (2013.01); F25B 49/02 (2013.01); F25B 2500/12 (2013.01); F25B 2500/13 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A refrigeration system, comprising:
a main circuit configured to connect, through a pipeline, to a multi-stage compressor, a condenser, an economizer, a main throttling element, and an evaporator;
an gas supply branch configured to connect, through a pipeline, to the gas outlet of the economizer and an intermediate stage gas inlet of the multi-stage compressor; and
a liquid injection branch configured to connect to the intermediate stage gas inlet of the multi-stage compressor from a section having a high-pressure liquid-phase refrigerant in the main circuit;
wherein the liquid injection branch includes a liquid injection valve for controllably turning on or off the liquid injection branch;
further comprising a vibration sensor and/or a noise sensor provided on the condenser and/or a compressor guide vane opening sensor arranged in the multi-stage compressor; wherein, the liquid injection valve turns on the liquid injection branch when the detection result of the vibration sensor exceeds a preset vibration value and/or the detection result of the noise sensor exceeds a preset noise value and/or the compressor guide vane opening is less than a preset guide vane opening value.