Patent · US Expired

Method and apparatus for supplying oil to a vacuum pump

US5178522A · kind A · utility

2Cited by

5References

6Claims

0Family size

Assignee

Leybold GmBH · DE

Inventors

Thomas Abelen · Cologne, DE
Lutz Arndt · Troisdorf, DE
Winfried Kaiser · Cologne, DE
Peter Muller · Adliswil, CH
Dieter Vorberg · Lechenich, DE

Key dates

Filing date	May 23, 1991
Grant date	Jan 12, 1993
Priority date	—
Expiry date	May 23, 2011

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04C29/02
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A two-stage rotary vane vacuum pump includes a pre-vacuum stage having a pre-vacuum pumping chamber and an outlet valve; a main oil sump; and a first oil conduit having a first opening communicating with the main oil sump and a second opening communicating with the pre-vacuum pumping chamber. The first opening is located at a level below an operational oil level in the main oil sump. There is further provided an intermediate oil sump situated at a level above the outlet valve and being arranged for receiving oil from the pre-vacuum pumping chamber; and a second oil conduit leading from the intermediate oil sump to components of the vacuum pump to be supplied with oil. All such components are situated at a level below the intermediate oil sump.

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