Patent ID: 7168926
Filing Date: 2007-01-30
Classification: F04D

Abstract:
1. An axial flow pump comprising: a case having an outer wall, a fluid suction port and a discharge port, the outer wall having a first thermal conductivity; a stator having a winding and disposed in the case; a cylindrical inner wall disposed inside the stator and in contact with the stator, the inner wall having a second thermal conductivity higher than the first thermal conductivity of the outer wall; a rotor disposed inside the inner wall and rotated upon energization of the winding of the stator, the energization of the winding causing generation of heat from the winding; and a flow path formed between the rotor and the inner wall, the flow path being communicated in fluid with the fluid suction port and the fluid discharge port, wherein the heat from the winding is transferred to the fluid in the flow path through the inner wall due to difference of the thermal conductivity between the outer wall and the inner wall.