Valve system for capacity control of screw compressors

Details Valve system for capacity control of screw compressors Valve system for capacity control of screw compressors

1982-05-06

1984-06-12

Smith, Leonard E.

Rotary expansible chamber devices

Heat exchange or non-working fluid lubricating or sealing

Non-working and working fluids intermix in working chamber

418201, F01C 116

Patent

active

044539002

ABSTRACT:
The invention relates to a valve system for capacity control of an oil-injected screw compressor. One or more valves (17-20), preferably at least two valves, are located in the wall of the rotor barrel (12, 13). The pressure in the compressed-air tank of the compressor actuates control valves, which in their turn open or close the valves (17-20). When the valves are opened, a direct connection between two consecutive thread volumes of at least one of the rotors (14, 15) is established, whereby the closed space capable to be used for the internal compression, is reduced.

REFERENCES:
patent: 1481358 (1924-01-01), Dwyer
patent: 3088659 (1963-05-01), Nilsson
patent: 3151806 (1964-10-01), Whitfield
patent: 3314597 (1967-04-01), Schibbye
patent: 3388854 (1968-06-01), Olofsson
patent: 3687572 (1972-08-01), Glanvall
patent: 3936239 (1976-02-01), Shaw
patent: 3989413 (1976-11-01), McGahan
patent: 4042310 (1977-08-01), Schibbye
patent: 4335582 (1982-06-01), Shaw

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