Screw vacuum pump with male and female screw rotors having...

Details Screw vacuum pump with male and female screw rotors having... Screw vacuum pump with male and female screw rotors having...

2004-03-02

2010-06-29

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Multistage

Interengaging rotary members

C418S189000, C418S201100, C418S201300

Reexamination Certificate

active

07744356

ABSTRACT:
In a screw vacuum pump30, equal lead screws each in the range of 1 to 4 leads are added on the discharge side of male and female screw rotors (4) and (5) having a continuously changing screw gear helix angle, at a final lead angle of the male and female unequal lead screw rotors on the discharge side that continuously change in helix angle following the advance of the screw gear helix.

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patent: 2002-031071 (2002-01-01), None
patent: 2002-061589 (2002-02-01), None

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