US 4,772,185 AGranted

Rotary vane pump having a plurality of inlet and outlet slots in a rotating sleeve

AssigneeBarmag AG

InventorSiegfried Hertell

Life of this patent

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Abstract

A rotary vane vacuum pump assembly is disclosed which is characterized by the absence of the discharge of lubricating oil with the exhaust airstream, and which includes an internal stator and a surrounding rotor. Pivotal vanes are mounted on the interior of the rotor, so as to define a plurality of air chambers which expand and contract as the rotor rotates about the stator. Also, a freely rotatably cylindrical sleeve is positioned between the stator and vanes, so that the relative sliding contact of the vanes on the surface of the sleeve is minimized, to thereby eliminate the need for internal oil lubrication. In one preferred embodiment, a hydraulic pump is joined to the vacuum pump to form a compact assembly, and wherein the hydraulic pump supplies oil to the bearings which mount the rotor.

Claims14

Dependent claims

A rotary vane pump adapted for use in generating a partial vacuum, and comprising

a supporting post defining a central axis,
a stator fixedly mounted to said post, said stator having a cylindrical outer surface which defines an axis which is offset from and parallel to said central axis,
a cylindrical sleeve coaxially mounted to said stator for free rotation about the axis of said stator,
a rotor coaxially disposed about said central axis and mounted for rotation and adapted to be rotatably driven about said post and enclosing said stator, said rotor having an outside cylindrical surface and an inside surface opposing said cylindrical sleeve,
a plurality of vanes pivotally mounted to said inside surface, with each of said vanes including an end portion engaging said cylindrical sleeve to divide the space between said cylindrical sleeve and said inside surface into a plurality of separated chambers which rotate about said stator upon rotation of said rotor, and such that said chambers expand during their rotation about one portion of the periphery of said stator and contract during rotation about a second portion of the periphery of said stator,
inlet air passageway means for delivering air to said chambers during expansion thereof, and extending through said post, said stator, and said cylindrical sleeve,
outlet air passageway means for exhausting air from said chambers during the contraction thereof, and extending through said cylindrical sleeve, said stator, and said post, and wherein one of said inlet and said outlet air passageway means comprises a radial air opening on the outer periphery of said stator, and a plurality of circumferentially spaced apart slots extending through said cylindrical sleeve, with said slots extending about the periphery of said sleeve and being aligned with said air opening.

4 more elements

A rotary vane pump assembly comprising

a supporting post defining a central axis,
a stator fixedly mounted to said post, said stator having a cylindrical outer surface which defines an axis which is offset from and parallel to said central axis,
a shaft extending through said post and along said central axis, with said shaft being rotatably mounted with respect to said post and said stator,
a cylindrical sleeve coaxially mounted ot said stator for free rotation about the axis of said stator,
a rotor fixedly mounted to said shaft for rotation about said post and said stator, said rotor having an outside surface which is adapted to be rotatably driven by a drive belt or the like and which is coaxially disposed about said central axis, and an inside surface facing said stator,
rotary vane means operatively mounted to said inside surface and between said rotor and said cylindrical sleeve for dividing the space between said rotor and said cylindrical sleeve into a plurality of separated chambers which rotate about said stator during rotation of said rotor, and such that the chambers expand during rotation about one portion of the periphery of said stator and contract during rotation about a second portion of the periphery of said stator,
inlet air passageway means for delivery air to said chambers during expansion thereof, and extending through said post, said stator, and said cylindrical sleeve,
outlet air passageway means for exhausting air from said chambers during the contraction thereof, and extending through said cylindrical sleeve, said stator, and said post, and wherein one of said inlet and said outlet air passageway means comprises a radial air opening on the outer periphery of said stator, and a plurality of circumferentially spaced apart slots extending through said cylindrical sleeve, with said slots extending about the periphery of said sleeve and being aligned with said air opening, and
rotary machine means and including a machine element which is fixedly mounted to said shaft so as to rotate therewith.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/934,663Filed 25 Nov 1986
Priority: DE 354190727 Nov 1985
Granted: 20 Sep 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F04C 29/128
Of the non-return type: of the elastic type, e.g. reed valves
F04C 18/39
Having the movement defined in group F04C18/02 and having a hinged member: with vanes hinged to the inner as well as to the outer member
F04C 18/46
Having the movement defined in group F04C18/08 or F04C18/22 and having a hinged member: with vanes hinged to the outer member
F04C 23/005
Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping…: of…