Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Patent
1979-06-06
1980-11-18
Woodiel, Donald O.
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
418159, F01C 116, F04C 200
Patent
active
042342961
ABSTRACT:
A screw compressor including a male rotor and a female rotor forming a pair, a rotor casing enclosing the pair of rotors and cooperating therewith to define a working chamber for compressing gas, a suction port and a discharge port formed in a suction cover and a discharge cover respectively provided to the rotor casing, a slide valve mounted at one part of the rotor casing for axial movement to return gas from the working chamber to the suction side of the compressor, a radial discharge port formed in the slide valve, and an axial discharge port formed in the discharge cover and smaller in size than the radial discharge port. The slide valve is formed therein with at least one gas flow passageway for communicating the working chamber with the discharge port only when the compressor operates in a controlled capacity mode.
REFERENCES:
patent: 3314597 (1967-04-01), Schibbye et al.
patent: 3656876 (1972-04-01), Kocher
patent: 3885402 (1975-05-01), Moody et al.
patent: 3913346 (1975-10-01), Moody et al.
patent: 3936239 (1976-02-01), Shaw
patent: 4062199 (1977-12-01), Kasahara et al.
Ishii Masaharu
Matsubara Katsumi
Miyagawa Mitsuhiko
Nozawa Shigekazu
Hitachi , Ltd.
Woodiel Donald O.
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