Patent ID: 6053718
Filing Date: 2000-04-25
Classification: F01C,F04C,F05C

Abstract:
A geared pump for conveying fluids lacking or having insufficient lubricating ability, the pump comprising:at least one connection for suction of fluids and at least one connection for expulsion of the fluids;ducts and interstices joining the connection for the suction of the fluids and the connection for the expulsion of the fluids; anda fluid conveying device disposed in one of said interstices and including an operating chamber having suction and expulsion sides, two gearwheels rotating in said operating chamber and mutually meshing for generating conveying spaces and reducing the conveying spaces again to a minimum value, and a housing of said operating chamber surrounding said gearwheels;at least one of said ducts for the suction of the fluids opening into said suction side of said operating chamber, and at least one of said ducts for the expulsion of the fluids opening from said pressure side of said operating chamber;said mutually meshing gearwheels formed of a material from the group consisting of nonferrous metal, steel, special steel, industrial ceramics, metals and metal alloys produced by powder metallurgy, thermosetting and thermoplastic synthetic materials, thermosetting and thermoplastic synthetic materials containing fillers and synthetically produced carbon; andsaid housing of said operating chamber formed of a synthetically produced material with a matrix formed of a carbonized, non-graphitized carbon and a filler bonded into the matrix, said filler formed of 35 to 97% by weight graphite, 0 to 62% by weight non-graphitized petroleum pitch coke or coal-tar pitch coke and 3 to 20% by weight mineral constituents.