Patent · US Expired

Two-shaft vacuum pump with internal compression

US4639199A · kind A · utility

8Cited by

6References

18Claims

0Family size

Assignee

Leybold-Heraeus GmbH · DE

Inventors

Heinz Frings · Cologne, DE
Hans-Peter Kabelitz · Cologne, DE
Karl-Heinz Ronthaler · Zülpich, DE

Key dates

Filing date	Jan 30, 1986
Grant date	Jan 27, 1987
Priority date	—
Expiry date	Jan 30, 2006

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04C18/126
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A two-shaft vacuum pump which draws gas in at an inlet and compresses it at a first outlet for discharge, thereby producing a vacuum at the inlet, has a second, pressure-responsive outlet from the area where the gas is compressed for discharge from the first outlet. The second outlet thereby relieves excess, compression gas pressure which could overload the pump motor, for example, at the start of operation when high-density gas is drawn in for compression.

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