Stationary volume ratio adjustment mechanism

摘要

A screw compressor with a volume ratio adjustment mechanism. The volume adjustment mechanism is a penetration in the housing of a screw compressor. The penetration includes one or more apertures. The apertures provide a flow path between the compressor outlet and an interlobe region of the screw compressor rotors. A member resides in the penetration and is movable from a first position in which the apertures are blocked and the flow path is closed and a second position in which the apertures are not blocked and the flow path is open. By unblocking the apertures and opening the flow path, the volume ratio can be adjusted.

主权项

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.