GB1359749A - Centrifugal pump - Google Patents

Abstract

1359749 Centrifugal pumps A R WILFLEY & SONS Inc 28 Feb 1972 [26 Feb 1971] 9169/72 Heading F1C A centrifugal pump extending through and supported by a platform 10 comprises an impeller 33 arranged within a casing 56, 57, 58, 59 such that the gap D between them is adjustable, and an expeller 53 adjacent the impeller and which co-operates with a die ring 50 to form a labyrinth seal therebetween. Impeller 33 is mounted on the hub end 32 of a rotary shaft 23 which coaxially surrounds a stationary shaft 35 and is driven by motor 16 through belts 18 and pulleys 17, 19. The rotary shaft is in three parts and is supported from the stationary shaft by radial and thrust bearings 42, 43 which are lubricated through pipes 44, 45. The stationary shaft is supported by a sleeve 36 in turn supported by arms 41 on platform 10. The pump casing 56, 57, 58 is of volute form and is supported from platform 10 by members 71 and an intake reservoir 65 which is provided with openings 66 having anti-vortexing blades and openings 68 through which liquid may be supplied for priming or flushing. A cylinder 47 disposed between shaft 23 and supports 71 carries the die ring 50 at its lower end and is supported from the stationary shaft 35 by plate 79 and bolts 78. Rotation of the nut 75 causes the stationary shaft 35 and the rotary shaft 23 with impeller 33 and cylinder 47 to be raised or lowered accordingly to adjust the gap D between the impeller and pump casing whilst maintaining the gap E between expeller 53 and die ring 50 constant. The latter gap E may be adjusted through bolts 78. The motor 16 is movable to adjust the tension in belts 18 by the adjustment screw 20 or sliding bolts 14. The supports 71, cylinder 47, and shafts 23, 35 may all have screw insertable sections to allow the depth of the pump to be varied Fig. 3 (not shown). In an alternative embodiment the cylinder 47 is fixed and the depth of the pump casing is adjustable Fig. 2 (not shown).