Piston unloader arrangement for screw compressors

Details Piston unloader arrangement for screw compressors Piston unloader arrangement for screw compressors

1992-06-23

1993-04-20

Gluck, Richard E.

Rotary expansible chamber devices

Methods

4182012, F01C 116

Patent

active

052036855

ABSTRACT:
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.

REFERENCES:
patent: 3088658 (1963-05-01), Wagenius
patent: 4042310 (1977-08-01), Schibbye et al.
patent: 4544333 (1985-10-01), Hirano
patent: 4565508 (1986-01-01), Lindstrom
patent: 4575323 (1986-03-01), Yoshimura

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