Screw compressor with spacer to prevent movement of volume adjus

Details Screw compressor with spacer to prevent movement of volume adjus Screw compressor with spacer to prevent movement of volume adjus

1991-03-12

1992-06-23

Bertsch, Richard A.

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

418270, F04C 1816, F04C 2900

Patent

active

051238225

ABSTRACT:
A screw compressor comprises a pair of screw rotors provided in a casing, a cylinder fixed to the casing and having a first chamber and a second chamber, a first piston fitted in the first chamber, a second piston fitted in the second chamber, a built-in volume ratio adjusting valve operated by the first piston, a volume control slide valve operated by the second piston, a stopper fixed to the casing to limit the backward movement of the built-in volume ratio adjusting valve, and a volume control slide valve. When built-in volume ratio adjustment is unnecessary, the built-in volume ratio adjusting valve is held immovable between the stopper and a spacer fixed to the built-in volume ratio adjusting valve and resting on a fixed surface of the casing. All the forces acting on the immovable built-in volume ratio adjusting valve are sustained by the casing, so that the rest of the components of the screw compressor are not exposed to excessive forces.

REFERENCES:
patent: 3412089 (1969-03-01), Schibbye
patent: 4076468 (1978-02-01), Persson et al.
patent: 4180089 (1979-12-01), Webb
patent: 4519748 (1985-05-01), Murphy et al.
patent: 4575323 (1986-03-01), Yoshimura
patent: 4609329 (1986-09-01), Pillis et al.
patent: 4964790 (1990-10-01), Scott

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