Pump for separating gas from a fluid to be pumped.

摘要

A centrifugal pump for separating an entrained gas from a working fluid in which the pump housing (1) has a hollow chamber therein, an axially extending inlet (3) into the chamber, an outlet leading out of the chamber, and a gas vent (15) for the chamber; a rotatable shaft (8) mounted in the housing in axial alignment with the inlet; an impeller (9) is disposed in the chamber and mounted on the shaft for rotation therewith, the impeller includes a plate (11) for dividing the chamber into a first chamber portion communicating with the inlet and outlet and a second chamber portion (16) communicating with the vent. The plate has an aperture (13) extending therethrough for allowing the passing of working fluid and gas therethrough; and is further provided with at least one pumping vane (10) disposed in the chamber portion for pumping the working fluid into the first chamber portion through the inlet and out of the first chamber portion through the outlet. The second chamber portion (16) is partitioned into a plurality of spaces (28) by a plurality of back vanes (14) secured to the plate and a liquid rotatable within the second chamber portion upon the impeller rotating whereby to create pressure differences in the spaces for removing gas in the second chamber portion through the vent.