GB816967A - Rotary pumps - Google Patents

Abstract

816,967. Rotary pumps; centrifugal governors. BURMAN & SONS Ltd., and BRIGGS, W. H. Nov. 12, 1957 [Nov. 28, 1956], No. 36356/56. Classes 57 and 110 (2). In a pump of the radially-sliding vane type the rotor i has a bore p containing an axially-slidable and spring-loaded valve member r, for controlling radial pressure-relief passages q, the valve being controlled by a centrifugal governor. Beyond a predetermined speed, some of the liquid being pumped circulates idly. Vanes m, in slots k, have tips which contact a casing lining a, the bore of which is built up of two radii on arcs c, d and connecting curves e, f. Liquid under pressure from the pump chamber acts through passages q to connect these to each other when, at high speed, the governor forces the valve r to the left, Fig. 1, to bring a recess s into alignment with the passages q. At normal pumping speeds, a spring t holds the valve in the position shown in Fig. 1. An axial vent u allows trapped liquid to escape from the spring chamber. A passage y which connects the pumping chamber, and the recess s, may be provided. The governor comprises a dished disc v, secured to the valve r, and a dished cover-plate w. Between the two parts v and w, one, or a ring of balls x are placed. A modified pump, Fig. 3, has a double-ended spindle n, n<SP>1</SP>, and the valve r is contained in the part n<SP>1</SP>. A governor disc v<SP>1</SP> is secured to the end of the part n<SP>1</SP> and the coacting disc v is fixed on the end of the valve r. The discs, preferably, are provided with radial recesses v<SP>2</SP>, containing the balls x, Fig. 4 (not shown).