Patent ID: 9631620
Date: 2017-04-25
CPC Classifications: F04C

Claim:
1. A screw compressor having an adjustable volume ratio, comprising: a power source; a motor connected to the power source; a control panel that controls the power source and the motor; a housing having a cavity, the housing in fluid communication with an inlet end and in fluid communication with an outlet end; rotors positioned in the housing cavity, the rotors having lobes and an interlobe region between the lobes compressing a refrigerant as received from the inlet end and discharged to the outlet end; a drive shaft connected to the motor rotating the rotors; a penetration in the housing, the penetration including at least one aperture, the at least one aperture providing a flow path from the interlobe region through the penetration to the outlet end; a member selectively positioned within the penetration, the member having a first end and a second end, the member selectively movable from outside the housing without compressor disassembly between a first position, in which the member blocks one or more apertures of the at least one aperture providing a minimum discharge volume with no flow path from the interlobe region to the outlet end to a second position, in which a flow path is provided from the interlobe region through the at least one aperture providing a maximum discharge volume, the compressed gas being discharged from the interlobe region through the at least one aperture to the outlet end; and wherein the selective position of the member within the penetration determines a volume ratio of the compressor.