Pumps – Motor driven – Electric or magnetic motor
Patent
1991-05-23
1993-01-12
Smith, Leonard E.
Pumps
Motor driven
Electric or magnetic motor
418 13, 418 96, 418 98, F04C 2902
Patent
active
051785226
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.
REFERENCES:
patent: 1409868 (1922-03-01), Kien
patent: 1672205 (1928-06-01), Eisler
patent: 2062045 (1936-11-01), Van Deventer
patent: 3525578 (1970-08-01), Le Blanc, Jr.
patent: 4844702 (1989-07-01), Ceccherni et al.
Abelen Thomas
Arndt Lutz
Kaiser Winfried
Muller Peter
Vorberg Dieter
Leybold Aktiengesellschaft
Smith Leonard E.
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