초록 ▼

An improved design of a rotary vane-type vacuum pump which prevents the oil used to lubricate the moving parts of the pump from entering the intake line of a connected vacuum chamber. The improvement comprises forming the inlet port in the front face of the cover plate which seals the end of the rot

An improved design of a rotary vane-type vacuum pump which prevents the oil used to lubricate the moving parts of the pump from entering the intake line of a connected vacuum chamber. The improvement comprises forming the inlet port in the front face of the cover plate which seals the end of the rotor casing. Filters are positioned in the intake port to catch any oil flowing along the inner wall of the intake port and to condense any oil foam entering therein. In order to facilitate the condensing of the oil foam, the inlet port is divided into two connected chambers, the lower of said chambers being of sufficient capacity to collect said oil foam flowing from the pump during its operation. A check valve is also positioned in the inlet port ahead of said filters in order to prevent the vacuum pressure in the vacuum chamber and intake line from dissipating through the pump and oil mist being drawn into the intake port when the pump is stopped.

대표청구항 ▼

In a rotary vane-type vacuum pump having a driven rotor element with vanes mounted thereon located within a casing which is sealed at one end by a cover plate, wherein the improvement comprises: an inlet port formed in the front face of said cover plate which is divided into upper and lower connecte

In a rotary vane-type vacuum pump having a driven rotor element with vanes mounted thereon located within a casing which is sealed at one end by a cover plate, wherein the improvement comprises: an inlet port formed in the front face of said cover plate which is divided into upper and lower connected chambers of differing capacities, a first filter located at the connecting point between said chambers and extending across the cross-sectional area thereof, a second cup-shaped filter suspension mounted in said upper chamber which is located, in an intake direction, ahead of said lower chamber, and a check valve located in said upper chamber.