Pumps – Motor driven – Electric or magnetic motor
Patent
1994-11-21
1996-03-26
Gluck, Richard E.
Pumps
Motor driven
Electric or magnetic motor
41742311, 415104, 415 90, F01D 136
Patent
active
055015832
ABSTRACT:
A turbo vacuum pump has a housing provided with a suction port and a discharge port, an evacuation pump disposed in the housing for compressing a gas suctioned through the suction port and discharging the compressed gas through the discharge port, and a motor for driving the evacuation pump, the motor and the evacuation pump having a common rotor. The rotor is supported at its both axial ends by bearings. A spiral grooved dynamic seal is disposed in the vicinity of the suction port and at the opposite side of the suction port to the evacuation pump. The diameter of the spiral grooved dynamic seal, at the smallest, is greater than the outside diameter of the final stage impeller of the evacuation pumps.
REFERENCES:
patent: 4057369 (1977-11-01), Isenberg et al.
patent: 4270882 (1981-06-01), Luijten et al.
patent: 4512725 (1985-04-01), Saulgeot
patent: 4695223 (1987-09-01), Caspar et al.
patent: 4717315 (1988-01-01), Miki et al.
patent: 4734018 (1988-03-01), Taniyama et al.
patent: 5059092 (1991-10-01), Kabelitz et al.
Nagaoka Takashi
Nishiuchi Akira
Sakagami Seiji
Sakurai Hirofumi
Ueda Shinjiro
Gluck Richard E.
Hitachi , Ltd.
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