High-vacuum pump having a bell-shaped rotor

Details High-vacuum pump having a bell-shaped rotor High-vacuum pump having a bell-shaped rotor

1988-02-10

1989-02-21

Garrett, Robert E.

Rotary kinetic fluid motors or pumps

Runner has spirally arranged blade or fluid passage

Extending along runner axis

415 90, F01D 136

Patent

active

048060747

ABSTRACT:
A molecular high-vacuum pump has a bell-shaped rotor 5 including a shaft supported by roller bearings 12, 13 disposed inside the bell rotor. The stator 1, 6 defines two converging pumping stages, one in cooperation with the inner cylindrical surface 10 of the rotor and the other in cooperation with the outer cylindrical surface 9 of the rotor. The suction inlet 3 is disposed in the apex area 4 of the bell rotor. The discharge outlet 11 of the pump is disposed in the vicinity of the lower rim of the bell, and both pumping stages transfer gases towards this rim. In this way, gases introduced through the inlet 3 into the pump cannot penetrate into the motor space 15 and damage the bearings of the pump.

REFERENCES:
patent: 1492846 (1924-05-01), Holweck et al.
patent: 2730297 (1956-01-01), van Dorsten et al.
patent: 3832084 (1974-08-01), Maurice
patent: 4270882 (1981-06-01), Luijten et al.

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