Patent · US Expired

Tempering method for a screw-type vacuum pump

US7232295B2 · kind B2 · utility

3Cited by

8References

25Claims

0Family size

Assignee

OERLIKON LEYBOLD VACCUM GMBH · DE

Inventors

Hartmut Kriehn · Neunburg vorm Wald, DE
Klaus Rofall · Sankt Goarshausen, DE
Manfred Behling

Key dates

Filing date	Oct 30, 2002
Grant date	Jun 19, 2007
Priority date	—
Expiry date	Jul 9, 2023

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04C2270/19
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A screw-type vacuum pump (1) is tempered such that characteristics of the pump are not substantially altered when the pump is subjected to thermal stress. In order to achieve said aim, cooling is adjusted according to an operating state of the screw-type vacuum pump (1), preferably to maintain a substantially constant pump gap (4).

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