Rotary screw vacuum pump with pressure controlled valve for lubr

Details Rotary screw vacuum pump with pressure controlled valve for lubr Rotary screw vacuum pump with pressure controlled valve for lubr

1989-11-20

1991-02-26

Vrablik, John J.

Rotary expansible chamber devices

Heat exchange or non-working fluid lubricating or sealing

With condition responsive control of non-working fluid

4182011, 418DIG1, 418 87, F04C 1816, F04C 2502, F04C 2702

Patent

active

049957970

ABSTRACT:
A screw vacuum pump which includes a pair of screw rotors meshing each other with a small gap defined therebetween. A closing valve is provided in an oil circulation line leading from an oil stripper to a rotor chamber accommodating the screw rotors. A pressure switch for detecting a suction pressure is connected to the closing valve. When the suction pressure is lower than a predetermined value (i.e., at high level of vacuum), the closing valve is opened to supply the oil into the rotor chamber.

REFERENCES:
patent: 4173440 (1979-11-01), Libis
patent: 4525129 (1985-06-01), Berges et al.
patent: 4526523 (1985-07-01), Parker
patent: 4808905 (1989-02-01), Nishitani et al.

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