초록 ▼

A screw compressor employs a piston unloader which is disposed in a bore remote from the compressor\s working chamber. Flow communication between the bore and working chamber is through a series of non-overlapping unloader ports. The unloader piston has a notched end face which effectively causes th

A screw compressor employs a piston unloader which is disposed in a bore remote from the compressor\s working chamber. Flow communication between the bore and working chamber is through a series of non-overlapping unloader ports. The unloader piston has a notched end face which effectively causes the unloader ports to overlap in operation. Precise and continuous capacity control of the compressor over a predetermined portion of its operating range is thereby achieved while internal high to low side gas leakage within the compressor and the clearance volume of the unloader ports is minimized. Compressor efficiency is thereby increased.

대표청구항 ▼

A screw compressor comprising: a housing defining a working chamber, a bore remote from said working chamber and a plurality of ports communicating therebetween said ports being spaced apart so that no portion of any one of them overlaps a adjacent port along said bore; and means, disposed for axial

A screw compressor comprising: a housing defining a working chamber, a bore remote from said working chamber and a plurality of ports communicating therebetween said ports being spaced apart so that no portion of any one of them overlaps a adjacent port along said bore; and means, disposed for axial movement within said bore, for unloading said compressor in a continuous manner by providing an uninterrupted unloading path from said working chamber to said bore through said ports.