Vacuum pump

Details Vacuum pump Vacuum pump

2005-11-15

2005-11-15

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

C418S201200, C418S150000, C418S180000

Reexamination Certificate

active

06964560

ABSTRACT:
An object of this invention is to prevent drop of life of a bearing by an axial force when using a pump as a compressor. In a vacuum pump1compressing and discharging gas in a direction of a rotor axis by rotation of screw rotors3, 4engaged together which are supported rotatably in a casing2, balance pistons13, 14are disposed on shafts6, 7of said screw rotors at inlet side of said casing. The balance pistons separate a receiving section17at area of the screw rotor and a pressurizing section16at area of the balance piston, and a thrust force of the screw rotors at a pressurizing condition is canceled by acting the discharge pressure in the pressurizing section. The pump is used as a compressor when the discharge pressure is acted on the balance pistons13, 14. When the pump is used as a vacuum pump, air at discharge side is sucked as cool air through a cooler toward a place near to the discharge side of the receiving section17at area of the screw rotor.

REFERENCES:
patent: 2349022 (1944-05-01), Ungar et al.
patent: 2656972 (1953-10-01), Rathman
patent: 3677664 (1972-07-01), Wycliffe et al.
patent: 5135374 (1992-08-01), Yoshimura et al.
patent: 5667370 (1997-09-01), Im
patent: 0959250 (1999-11-01), None
patent: 2-149893 (1990-12-01), None
Translation of International Preliminary Examination Report.

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