Vacuum pumps

Details Vacuum pumps Vacuum pumps

1994-12-05

1996-11-12

Freay, Charles

Rotary expansible chamber devices

Multistage

Sliding vane

418 87, 418 97, F01C 1100

Patent

active

055733875

ABSTRACT:
A rotary vacuum pump having a low vacuum stage and a high vacuum stage. Each stage includes a stator body having a bore and a rotor mounted eccentrically in the bore to form a cavity between the stator body and the rotor. The rotor of each stage has two vanes slidably positioned in diametrically opposed slots in the rotor which in use of the pump are substantially in contact with an inner wall of the stator body during rotation of the rotor. The stator body of each stage has an inlet and an outlet to allow, in use of the pump, fluid being pumped to enter into and be expelled from the cavity by means of the rotating vanes. Oil to be injected into the low vacuum stage and, when required, into the high vacuum stage also. Differential flow rates (including zero) of ballast gas are introduced to the low vacuum stage, for example in an amount in excess of ten percent of the overall vacuum pump capacity (which equates to the capacity of the high vacuum stage). As a result, the rotary vacuum pump is operable as a one stage or as a two stage pump.

REFERENCES:
patent: 4268230 (1981-05-01), Bassan
patent: 4838772 (1989-06-01), LeBlanc
patent: 5066202 (1991-11-01), Berges et al.

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