Vacuum pumps

Details Vacuum pumps Vacuum pumps

1999-06-16

2000-10-10

Denion, Thomas

Rotary expansible chamber devices

Interengaging rotating members

Each tapered

418 3, 418 9, F01C 124

Patent

active

061295345

ABSTRACT:
A compound vacuum pump incorporating a screw mechanism section. The screw mechanism section comprising two externally threaded rotors mounted on respective shafts in a pump body. The rotors are adapted for counter-rotation in a first chamber within the pump body with intermeshing of the rotor threads to pump gas by action of the rotors. The root diameter of each rotor increases and the thread diameter of each rotor decreases in a direction taken from pump inlet and in which the gas is pumped. The pump additionally incorporates a roots mechanism section comprising two roots-type profile rotors also mounted on the respective shafts and adapted for counter-rotation in a second chamber within the pump body situated at an inlet end of the pump.

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patent: 4504201 (1985-03-01), Wycliffe
patent: 4792294 (1988-12-01), Mowli
patent: 4934908 (1990-06-01), Turrell et al.
patent: 5549463 (1996-08-01), Ozawa
patent: 5567370 (1996-10-01), Im

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