GB632414A - Improvements relating to rotary pumps and motors - Google Patents

Abstract

632,414. Rotary pumps and engines. PRENDERGAST, C. S., PRENDERGAST, R. S., and DIXEY, G. W. B. Aug. 27, 1947, Nos. 23645 and 27484. [Class 110(ii)] A piston 3 is gyrated within a cylinder 4 (or vice-versa) by means of an eccentric, sliding vanes 12 dividing the crescent - shaped working space into separate parts which expand and contract with the gyratory motion. The tips of the vanes slide in recesses 13 in the cylinder. The vanes may be T-shaped or L-shaped and be held in contact with the cylinder slots by axial bearing pins, hydraulic or spring pressure. The piston 3 is mounted on an eccentric 2 on a shaft 1 mounted in bearings 9, 10, A liner 3b supports a sleeve portion 3a of the piston. For a pump, fluid is admitted through a bore 14, in the shaft 1, from an inlet 15, and led to the working-chambers from a port 16 through radial passages 17 in the piston. Fluid is discharged through a duct 18 by way of a valve 21 surrounding the sleeve 3a and covering ports 18a. The valve 21 leads to a space 20 and outlet 19. The space 20 is open to the inner ends of recesses 11 so that fluid under pressure forces out the vanes. Sealing rings 22 bear on the ends of the sleeve 3a. A pressure relief valve 23 is provided. Figs. 5, 6 show another arrangement (for an engine) in which the piston 3 is mounted on an eccentric 2 through a ball-bearing 40 and is rigid with spacer rings 41, 41a. Pressure fluid is admitted through a bore 14 and exhausted through an outlet bore 42, separated by a partition 43. Inlet and outlet ports 16, 44 respectively, are provided in the shaft 2, and co-act with the respective inlet and outlet passages 17, 45. In modifications, the slots are carried by the member 3, and the vanes 12 extend into slots in the ring 4.