Patent · US Expired

Gas friction pump

US6524060B2 · kind B2 · utility

4Cited by

6References

5Claims

0Family size

Assignee

PFEIFFER VACUUM · FR

Inventors

Armin Conrad · Herborn, DE
Heinrich Lotz · Wetzlar, DE

Key dates

Filing date	Feb 23, 2001
Grant date	Feb 25, 2003
Priority date	—
Expiry date	Feb 23, 2021

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04D29/321
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A gas friction pump including a housing having a suction opening and an exhaust opening, main rotor and stator components arranged in the housing and cooperating with each other for delivering gases and for producing a pressure difference, and an auxiliary pumping unit provided at a side of the suction opening and having a gas delivery structure that provides for gas delivery in a radial direction, with the auxiliary pumping unit being formed of at least one stage and having auxiliary rotor and stator components, with the auxiliary rotor components being supported on the shaft which supports the main rotor components.

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