Patent ID: 6497563
Filing Date: 2002-12-24
Classification: F04C

Abstract:
A dry-compressing screw pump in the form of a two-shaft positive displacement pump, comprising:a first and a second rotor spindle disposed parallel to each other and forming a rotor spindle pair that is disposed in a closed compression chamber; wherein the rotor spindles are hollow, and have inner diameters; wherein a cooling medium is red at a first front face of the rotor spindles and evacuated at a second front face of the rotor spindles; wherein a cooling medium feeding and evacuation means is connected to an external cooling medium circuit; wherein the inner diameters of the hollow rotor spindles continuously increase from the first front face toward the second front face, whereby the cooling medium is conveyed from the first front face to the second front face substantially under the influence of centrifugal force acting on the cooling medium due to the rotation of the rotor spindle.