Pumping stage for a vacuum pump

Details Pumping stage for a vacuum pump Pumping stage for a vacuum pump

2005-04-12

2005-04-12

Verdier, Christopher (Department: 3745)

Rotary kinetic fluid motors or pumps

Smooth runner surface for working fluid frictional contact

C415S055100, C415S055400, C415S055600

Reexamination Certificate

active

06877949

ABSTRACT:
A pumping stage for a vacuum pump, has an improved geometry allowing an optimum trade-off to be achieved between the exhaust pressure and the pumping rate attained in that stage. In the pumping stage (1) the axial extension that is the height of the pumping channel (3) varies along the circumference of the channel (3) between the inlet port (13) and the outlet port (15).

REFERENCES:
patent: 5358373 (1994-10-01), Hablanian
patent: 5456575 (1995-10-01), Helmer et al.

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