Device for moving gas at subatmospheric pressure

US4797062A · kind A · utility

Assignee

• Leybold-Heraeus GmbH · DE

Inventors

• Ludger A. Deters · Remscheid, DE
• Heinrich Engländer · Linnich, DE
• Hans-Peter Kabelitz · Cologne, DE
• Gunter Schutz · Recklinghausen, DE

Key dates

• Filing date: Oct 20, 1987
• Grant date: Jan 10, 1989
• Expiry date: Oct 20, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16J15/406
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A device for moving a gas at a subatmospheric pressure with a screwthread-like device on at least one of the facing surfaces of a rotor spacedly surrounded axially by a relatively-rotatable stator insulates the stator from a housing for the device to prevent thermal variation of the space between the rotor and stator and, thus, keeping the gas-moving action constant.