Gas friction pump

US5893702A · kind A · utility

Assignee

• PFEIFFER VACUUM · FR

Inventors

• Armin Conrad · Herborn, DE
• Heinrich Lotz · Wetzlar, DE
• Carsten Reese · Aßlar, DE

Key dates

• Filing date: Aug 5, 1997
• Grant date: Apr 13, 1999
• Expiry date: Aug 5, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04D19/046
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A gas friction pump including a rotor located in the pump housing and formed of a plurality of coaxial first cylindrical elements, and a stator located in the housing and formed of a plurality of second cylindrical elements coaxial with the first cylindrical elements and surrounding respective first cylindrical elements, with the first cylindrical elements or the second cylindrical elements having smooth inner and outer surfaces, and another ones of the first cylindrical elements and the second cylindrical elements have a plurality of parallel discharge channels formed on their inner and outer surfaces, arranged one beneath another and separated by a respective plurality of webs, the parallel discharge channels defining a plurality of parallel discharge chambers forming a plurality of parallel operating pumping chambers for pumping gas form the suction port to the discharge port.