SEAL FOR REVOLVING PARTS OF CENTRIFUGAL PUMP Russian patent published in 2002 - IPC

FIELD: mechanical engineering; centrifugal pumps and other rotary machines. SUBSTANCE: seal for revolving parts of centrifugal pump includes body where passages communicated with high-pressure area are provided. Mounted in body is bush having circular bore and through radial holes communicated with passages. Seal has ring consisting two half-rings with cylindrical projections. Ring is located in circular bore of bush; projections of half- rings are received by radial holes of bush and mating surfaces of half-rings have form of tenon and groove with clearance in between them. EFFECT: reduced leakage of working fluid; enhanced volumetric efficiency of pump; enhanced reliability of seal; possibility of increasing clearances between housing and revolving parts, thus excluding mechanical friction of impeller neck in case of temperature expansion or in case of sagging of rotor in the course of operation. 2 cl, 2 dwg