Rotary expansible chamber devices – With mechanical sealing
Patent
1987-07-24
1988-11-01
Vrablik, John J.
Rotary expansible chamber devices
With mechanical sealing
418201, 277 3, 277 71, 277 72R, 277 79, F04C 1816, F04C 2700, F04C 2902, F16J 1516
Patent
active
047815531
ABSTRACT:
A screw vacuum pump which includes a casing having a rotor chamber opened at its one end to a suction opening and opened at the other end to a discharge opening; a pair of male and female screw rotors rotatably received in the rotor chamber, each of the screw rotors having a pair of rotor shafts supported by forcibly lubricated bearings on both sides of the suction opening and the discharge opening; at least one first sealing member provided between the bearing on at least the suction opening side and the rotor chamber and communicated with a space under pressure less than atmospheric pressure which space is out of communication with the suction opening; and at least one second sealing member provided between the bearing on at least the suction opening side and the rotor chamber and communicated with the atmosphere, the first and second sealing members being arranged in this order from the rotor chamber side.
REFERENCES:
patent: 4153395 (1979-05-01), O'Neill
patent: 4329126 (1982-05-01), Nishimura
patent: 4487563 (1984-12-01), Mori et al.
Nishitani Kunihiko
Nomura Ituro
Tsuboi Noboru
Kabushiki Kaisha Kobe Seiko Sho
Vrablik John J.
LandOfFree
Screw vacuum pump with lubricated bearings and a plurality of sh does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Screw vacuum pump with lubricated bearings and a plurality of sh, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Screw vacuum pump with lubricated bearings and a plurality of sh will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-887914