GB1152912A - Improvements in or relating to Rotary Pumps - Google Patents

Abstract

1,152,912. Rotary pumps. VSESOJUZNY NAUCHNO-ISSLEDOVATEI SKY KONSTRUKTORSKY I TEKHNOLOGICHESKY INSTITUT GIDROMASHINOSTROENIJA. May 6, 1966, No.20044/66. Heading F1F. In a rotary pump of the flexible-chamber type, a lobed rotor 5 effects displacement of a liquid in spaces between two pairs of flexible walls 2, Fig. 1, the rate of displacement being regulated by another liquid in chambers 7, 8 adjacent the rotor and spring-loaded radially-movable vanes 3. Inlet and outlet channels 14, 15 associated with the spaces aforesaid may be connected to pipes 13, 16 in parallel, as shown, in series, Fig. 6 (not shown), or so as to permit pumping of liquid from two different sources, Fig. 7 (not shown), to two corresponding points of utilization, simultaneously. Liquid in the chambers circulates by way of a tank 17, a spring-loaded non-return valve 18 and adjustable throttling-valves 19, 20. In a second embodiment, Fig. 2 (not shown), the channels 14, 15 are connected in series with one another and liquid in the chamber 7, 8 circulates through a tank (21) by way of the non-return valve 18 and the throttling-valves 19, 20, the valves 18, 19 being connected in series with each other. The tank (21) is sealed and contains a flexible partition (22) so that the pressures in the pipe 13 and the tank can be rendered equal through a pipe (25) while keeping the liquid that is being pumped separate from that in the latter and the chambers 7, 8. In a third embodiment, Figs. 3 and 4 (not shown), control of the rate of displacement of liquid between the walls 2 is effected by a tank (26) attached to the body of the pump and containing a flexible partition or membrane (27), a space (29) on one side of the partition being connected to the pipe 13 whereas a space (28) on the other side can be connected to either the chambers 7 or the chambers 8 by a solenoid-operated valve (32). , In fourth embodiment, Fig. 5, single flexible walls 2 are provided and the chamber 8 are connected to a hydraulic accumulator 35 wherein the pressure is sustained equal to, or somewhat less than, the pressure in the pipe 16 by a pump 36 and throttling-valve 37 of the bellows type on the output side of this pump, the chamber 7 being connected to another hydraulic accumulator 39 through an adjustable throttling-valve 47, which facilitates variation in the rate of displacement of the liquid from the channels 14 of the channels 15. The pump 36 renders the pressure in the accumulator 39 equal to, or somewhat less than that in the pipe 13, the pressure being determined by a non-return valve 42 and a reducing valve 43 through which compressed air, or other gas, is admitted to a tank 41 for supplying liquid to the pump 36. The pressure of air on the tank 41 may be varied in accordance with pressure changes in the pipe 13 by the latter being connected to the tank 41 through the valve 43. If the pressure in the pipe 13 is subatmospheric, the tank 41 is connected to either the ambient, atmosphere or a vacuum system through a valve 44, the valve 43 being closed.