ROTARY MACHINE Russian patent published in 1994 - IPC

FIELD: manufacture of pumps. SUBSTANCE: arranged in the housing is stator ring with profiled inner surface. End plates are provided with passages for supplying the lubricating fluid. Rotor with slots is mounted concentrically on shaft in the ring. Slots receive separating plates which are convex on side of the housing. Plates are made for reciprocating and for forming precompressing chambers under the plates, working chambers in the ring and passages for supplying and discharging the working medium. Inner surfaces of end plates are provided with circular grooves for each working chamber; circular grooves are located opposite the precompressing chambers. Rotor is mounted in spaced relation to end plates. Amount of clearance from surface of shaft to groove does not exceed amount of clearance from groove to peripheral section of end plates. Grooves on the end plates are bow-shaped and are bounded by radial planes passing respectively through the beginning of section of contact of ring with rotor in the direction of rotation of rotor and section located between 90 to 150 deg. from middle of contact of section of rotor with ring. EFFECT: enhanced reliability. 2 cl, 7 dwg