GB1317757A - Centrifugal pumps - Google Patents

Abstract

1317757 Centrifugal pumps WORTHINGTON CORP 30 July 1970 [31 July 1969] 36892/70 Heading F1C A single-inlet centrifugal pump of the type in which change of direction is imparted to fluid before it reaches the impeller comprises means adapted to effect a distribution of streams of sucked fluid along a substantially circumferential or spiral path with respect to the impeller axis, to effect a uniform inward deviation of the streams radially towards the axis and subsequently gradually and continuously to withdraw the fluid streams and convey them to the impeller in the direction of the axis in such manner that tangential velocity components are removed and a substantially uniform distribution of the axial velocity of the streams is effected. Liquid enters the pump via a volute 10 having a tangential inlet (not shown), the cross-sectional area of the volute being reduced progressively in the direction of rotation of the liquid about the volute axis by means of a reduction of either the radial depth of the volute or, as shown, the axial dimension. The liquid is progressively withdrawn from the volute through at least one row of blading 14 which produces a radially inward and axial deflection. As shown, the impeller (not shown) may be preceded by an inducer rotor 21. A chamber 15, exhausted via a port 17, may be provided for collecting gas and vapour from the liquid via an annular gap 16 between two castings 18, 19.