Patent ID: 7052230
Filing Date: 2006-05-30
Classification: F01C,F04C

Abstract:
1. A pump assembly including a pump, a pump frame and a motor, the pump including a pumping member which is mounted in a pump housing, relative rotation of the pumping member with respect to the pump housing causing pumping of fluid, and the motor including a rotor and a stator, operation of the motor causing rotation of the pumping member relative to the pump housing, wherein one or two of the stator, pumping member and pump housing is/are fixed relative to the pump frame, a resilient support part being provided between the pump frame and each of the other two or one of the stator, pumping member, and pump housing, the resilient support part or parts permitting movement of the stator, pumping member or pump housing with respect to the pump frame wherein the pumping member is provided with at least one generally helical screw thread, and the pump is further provided with at least one auxiliary pumping member which is also mounted for rotation in the housing, the auxiliary pumping member also being provided with a generally helical screw thread which meshes with the screw thread of the main pumping member such that rotation of the main pumping member causes rotation of the auxiliary pumping member.