Patent ID: 6551054
Filing Date: 2003-04-22
Classification: D21D,F04D,F05B

Abstract:
A method of pumping a gas-containing and viscous material with a pumping apparatus comprising a casing, suction and discharge ducts therein, an impeller further comprising at least one or more pumping vanes, and a rotor arranged in front of the impeller, which rotor further comprises one or more blades each having an increasing pitch in a direction towards the impeller, wherein said method comprises:introducing material to flow to the pumping apparatus through said suction duct; rotating the one or more blades of the rotor to move the material through the suction duct and to the impeller, and discharging the material from said pumping apparatus to the discharge duct; wherein the increasing pitch of the one or more blades of the rotor increases a pressure of the material as the material is moved by the blades towards the impeller, and at a final part of the suction duct adjacent the impeller the rotor subjects the material to centrifugal force in order to separate gas from the material.