Multistage roots-type vacuum pump

Details Multistage roots-type vacuum pump Multistage roots-type vacuum pump

2006-08-24

2009-02-17

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Multistage

Interengaging rotary members

C418S206500

Reexamination Certificate

active

07491041

ABSTRACT:
The invention reduces power consumption and makes a rotor with ease. As illustrated in FIG.2, a multistage roots pump (1) in the invention includes upstream rotors (R1a, R1b, R2a, R2b) having multiple teeth, supported by a pair of revolving shafts (A1, A2); and downstream rotors (R3a, R3b-R5a, R5b) having an identical number of teeth (31) with the upstream rotors, supported by revolving shafts (A1, A2). The discharge area formed by the outer periphery of the downstream rotors (R3a, R3b-R5a, R5b) and the inner periphewy of the pump chambers (P1-P5) is smaller than that of the upstream rotors (R1a, R1b, R2a, R2b).

REFERENCES:
patent: 1214300 (1917-01-01), Grouvelle et al.
patent: 4943214 (1990-07-01), Niimura et al.
patent: 4995796 (1991-02-01), Kambe et al.
patent: 62023501 (1987-01-01), None
patent: 2000-45976 (2000-02-01), None
patent: 2000045976 (2000-02-01), None
patent: 2002364569 (2002-12-01), None
patent: 2003307192 (2003-10-01), None

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