Patent ID: 11859881
Assignee: CARRIER CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 7:
8. A control method for a refrigeration system having 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, the method comprising:
when the vibration of the condenser exceeds a preset vibration value and/or the noise exceeds a preset noise value or the compressor guide vane opening is less than a preset guide vane opening value, the liquid injection branch is turned on and liquid-phase refrigerant is introduced to absorb the vibration; and
when the superheat of the system is less than the preset superheat value, the liquid injection branch is turned off.