GB1388562A - Pumps for liquids - Google Patents

Abstract

1388562 Centrifugal pumps JOSEPH LUCAS (INDUSTRIES) Ltd 5 July 1972 [10 July 1971] 32497/71 Heading F1C The invention relates to a pump for liquid which comprises a housing 10 in which is rotatably mounted a hollow rotor 13, a stationary pick-up member 24 being disposed within the rotor by which liquid is passed to outlet 12, the pick-up member being pivotably mounted whereby the radius of its inlet 32 may be varied. The housing 10 comprises an inlet 11 and an outlet 12, the rotor being driven by means of a shaft 19; the rotor comprises a conical portion 15 and radial vanes 16. The housing 10 comprises a cylindrical part 20 which projects into the hollow interior of the rotor being formed with two passages 26 which communicate with the outlet 12. The pick-up member 24 comprises an inlet 32 and an internal passage 25 which communicates with the passages 26. The member 24 is pivotably mounted at its inner end whereby the radial distance of the inlet 32 from the rotor axis may be varied, so varying the pressure of the liquid at the pump outlet. The member is formed with a gear sector 27 which engages a rack formed on an axially movable rod 28, the rod being movable by a piston-in-cylinder type actuator 29. Any air or vapour within the rotor may pass through labyrinth seal 21 to space 22 and thence through openings 33 to the rotor inlet 17. In Figure 3 the pick-up member 42 is mounted on a hollow shaft 45 which is rotatably mounted in the fixed structure 43 eccentrically of the rotor axis. The hollow shaft is formed with inlet openings 47 by which liquid passes from the pick-up member into the shaft, and with openings 46 by which liquid passes from the shaft to the outlet 48. The shaft 45 is rotatable by means of a lever 49 so as to vary the distance of the inlet of the pick-up member from the axis of the rotor.