Patent · US Expired

Vacuum pump with a gas ballast device

US5871338A · kind A · utility

1Cited by

5References

23Claims

0Family size

Assignee

Leybold GmBH · DE

Inventors

Thomas Abelen · Cologne, DE
Lutz Arndt · Troisdorf, DE
Peter Muller · Adliswil, CH

Key dates

Filing date	Jan 29, 1996
Grant date	Feb 16, 1999
Priority date	—
Expiry date	Jan 29, 2016

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/2663
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

The invention pertains to a vacuum pump (1) with a closable line (63, 102) through which gas ballast can be fed into the pump chamber (8, 9); to eliminate the danger that a recipient hooked up to the vacuum pump may be charged with air in the event of a pump failure, the invention proposes that the line be equipped with a control valve (59, 60, 61; 98, 99; 109, 110) to regulate the gas ballast feed as a function of operating conditions, such that the line is closed in the event of a pump failure.

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