Rotary expansible chamber devices – Methods
Patent
1981-12-02
1984-07-31
Vrablik, John J.
Rotary expansible chamber devices
Methods
418 94, 418 98, 418203, F04C 1816, F04C 2902
Patent
active
044627696
ABSTRACT:
This invention relates to a method at oil-injected screw-compressors for balancing axial forces at at least one of the rotors of the compressor, for sealing the gaps between rotor housing and rotor shafts and for cooling and lubricating the bearings of the rotor shafts. At the high-pressure end of the compressor oil under pressure of such magnitude is supplied to the bearing spaces (28a,28b) at the ends of both rotors that an oil flow inward to the compression space along the gaps (32a, 32b) between the rotor shafts and the rotor housing is obtained for sealing against leakage from the compression space. Oil at this pressure further is supplied via a connection (42) from the bearing space (28b) of the female rotor to a pressure space (38) at the low-pressure end of the female rotor for balancing the axial force arising on the shaft end (31) of the female rotor on the high-pressure side due to the oil supplied to the bearing space (28b) of the female rotor.
REFERENCES:
patent: 1698802 (1929-01-01), Montelius
patent: 2082412 (1937-06-01), Morton
patent: 2111883 (1938-03-01), Burghauser
patent: 3462072 (1969-08-01), Schibbye
patent: 3932073 (1976-01-01), Schibbye et al.
patent: 4180089 (1979-12-01), Webb
Englund Rolf A.
Schibbye (Lars) Lauritz B.
Sullair Technology AB
Vrablik John J.
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