Patent · US Active

Screw-type vacuum pump having overpressure openings

US8602759B2 · kind B2 · utility

0Cited by

4References

14Claims

0Family size

Assignee

OERLIKON LEYBOLD VACCUM GMBH · DE

Inventors

Peter Birch · Brighton, GB
Robert Jenkins · Boise, US
Roland Muller · Weiling, DE
Magnus Janicki
Wolfgang Giebmanns · Lechenich, DE

Key dates

Filing date	Apr 13, 2010
Grant date	Dec 10, 2013
Priority date	—
Expiry date	Jul 21, 2030

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04C29/126
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A screw vacuum pump, in particular for compression against atmospheric pressure, comprises a pump housing defining a suction chamber. Two meshing screw rotors are arranged in the suction chamber. Further, an overpressure outlet provided, which comprises an overpressure opening in a side wall of the suction chamber. Further, an overpressure valve is arranged in the overpressure outlet. The width (b) of the overpressure opening in the longitudinal direction of the screw rotors is smaller than or equal to a tooth width (B) of the screw rotors.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.