GB322781A - Improvements relating to rotary pumps - Google Patents

Abstract

322,781. Mercer, A. A. Aug. 13, 1928. Disc - supported - blade pumps; casings.-A pump for liquids and semi-liquids has means incorporated with its inlet to give the entering material a gradually accelerated helical flow so that it meets the revolving impeller without shock. A hollow pedestal 1 rises from the drainage trav 2 and carries the bearing liner 4 in which is rotatably mounted a sleeve 7 within which is the impeller shaft 16. The curved end 8 of the liner makes a line contact with the apertured cover 9 of the impeller casing 12. Arms 11 extend radially from the end 8 and are engaged by hoop fasteners 13 pivoted on the impeller casing 12. A ring 15a, preferably of rubber, is interposed between the casing 12 and its cover 9. The impeller boss 19 is integral with the blades 20, which are recessed near the hub, and the impeller is completed by back. and front plates 18, 21, the edges of which are turned inwards, as shown. An outwardy flared cone 24 forms an extension of the casing 12 and contains a stationary volute member 23 having a helical groove for the supply of liquid to the pump. The end of the cone 24 is closed by a flange 25 on the member 23 held in position by spring clamps 27. The liquid is fed through the admission channel 26 and passes through the helical groove to the impeller. Any gas in the liquid is withdrawn from the impeller through the ports 58 and duct 56 to an annular groove 50 in the disc 51. This groove has a number of radial ports closed by spring loaded valves 53 when the pump is not working; the valves, however, are thrown outwards by centrifugal force when the pump is working thereby opening the ports to the atmosphere.