Patent ID: 11953006
Assignee: YORK (WUXI) AIR CONDITIONING AND REFRIGERATION CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 5:
6. The screw compressor of claim 1, wherein:
when the spool valve is in a first position, the spool valve head end is located at an outer side of the suction head end of the screw rotor, a portion of a working side of the spool valve is configured to shield a section of the screw rotor extending from the suction head end to the exhaust tail end, and the screw compressor has an actual minimum internal volume ratio (Vimin), wherein the first position is a first maximum stroke position of the spool valve toward the suction head end,
when the spool valve is in a second position, the spool valve head end is aligned with the suction head end of the screw compressor, an entirety of the working side of the spool valve is configured to shield the section of the screw rotor extending from the suction head end to the exhaust tail end, and the screw compressor has an actual maximum internal volume ratio (Vimax1), and
when the spool valve is in a third position, the spool valve head end is located at the inner side of the suction head end of the screw compressor, the entirety of the working side of the spool valve is configured to shield the section of the screw rotor between the suction head end and the exhaust tail end, and the screw compressor has a virtual maximum internal volume ratio (Vimax2), wherein the third position is a second maximum stroke position of the spool valve toward the exhaust tail end.