Rotary vane pump with sealing means
AssigneeWibau
InventorsGerhard Peleschka, Friederich Nuebling
Life of this patent
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Abstract
A pump is comprised of a housing within which a rotary piston is rotatably mounted, to define therebetween an annular conveying channel between an inlet port and an outlet port. Annular sealing rings between the piston and housing seal the conveying channel at the periphery of the piston. A stopper extends into the conveying channel in the back flow path, and sealing elements are provided to seal the entire cross section of the back flow paths. Radially movable slides on the piston are resiliently urged into the conveying channel, the radial position thereof being controlled by a cam surface in the housing. The slides are urged radially outwardly by springs, and seals are provided on the piston for sealingly guiding the piston in the radial direction.
Claims16
In a pump having housing means with inlet port means and outlet port means as well as rotary piston means rotatably mounted in said housing means, said rotary piston means and said housing means defining a conveying channel between said inlet and outlet port means, said conveying channel having a suction end adjacent said inlet port means and a pressure end adjacent said outlet port means, radially displaceable slide means mounted on said rotary piston means for radial movement into and out of said conveying channel, guide means in said rotary piston means for guiding the radial movement of said slide means, and cam means in said housing means for radially moving said slide means in response to piston rotation, the improvement comprising first sealing means (12, 13) operatively arranged between said housing means and said rotary piston means substantially along the circumference of said rotary piston means adjacent to each side thereof, second sealing means (24, 25) operatively arranged to provide a seal between said radially displaceable slide means and said guide means, third sealing means (29) arranged to urge said slide means with the outer ends thereof radially against said housing means, fourth sealing means (9, 10) operatively arranged between said outlet port means and said inlet port means to block return flow from said outlet port means to said inlet port means and fifth sealing means (34) in the form of a sealing ring having a radially outwardly facing V-groove, one such sealing ring being inserted on each side of the rotary piston means between the latter and the respective housing means, said V-groove sealing rings extending laterally around said guide means and said cam means to further seal the guide means and the cam means against leakage penetration.
In a pump comprising a housing, a rotary piston rotatably mounted in said housing, whereby said housing and piston define an annular conveying channel at the radially outer periphery of said piston, and inlet and outlet ports extend tangentially to said channel parallel to one another from the same direction, whereby a back flow path between said outlet and inlet is formed by one course of said conveying channel, and wherein said pump further comprises radially displaceable slides mounted on said piston for movement into and out of said channel, means on said rotary piston for guiding said slides for radial movement, and cam means on said housing for radially moving said slides;
- the improvement wherein said rotary piston comprises a pair of axially spaced apart side disks, an annular channel bottom extending between said disks, and a plurality of radially extending guide slots, said pump further comprising sliding seal means between the outer periphery of said side disks and said housing, whereby said conveying channel is defined by said side disks, channel bottom, sliding seal means and housing;
- said pump further comprising a stopper in said back flow path, means for mounting said stopper at a fixed peripheral position with respect to said housing, means for radially adjusting said stopper, and sealing means for slidably sealing the space between said stopper and said disks in the channel bottom, whereby said back flow path is fully blocked;
- and further comprising means for resiliently urging said slides radially outwardly, and means in said guide slots for sealingly guiding said slides and sealing means in the form of a sealing ring having a radially outwardly facing V-groove, one such sealing ring being inserted on each side of the rotary piston between the latter and the respective housing, said V-groove sealing rings extending laterally around said guide means and said cam means to further seal the guide means and the cam means against leakage penetration.
Dependencies are inferred from the claim text.