Patent ID: 7922464
Filing Date: 2011-04-12
Classification: F04D

Abstract:
1. A magnetic drive pump, comprising: a pump chamber including an inlet port and an outlet port; a partition wall separating the pump chamber from an exterior; a rotational shaft provided at a side of the pump chamber relative to the partition wall; an impeller rotatably supported by a first end of the rotational shaft; an inductor integrally fixed to the impeller to rotate; a magnetic means positioned radially outside of the partition wall and facing the inductor, the magnetic means rotatably supported; a rotation drive means fixed to the magnetic means and actuating the magnetic means to rotate; and a drive means moving at least one of the magnetic means and the inductor in an axial direction of the rotational shaft, the drive means including a hermetically closed space which changes volume in response to a change of internal pressure applied thereto, the hermetically closed space comprising an outer cylinder, an inner diaphragm having a first end portion fitted for axial movement into a first end portion of the outer cylinder, and a yoke fixed to a second end portion of the inner diaphragm, the yoke having an outer surface in fluid-tight sliding engagement with an inner surface of the outer cylinder at a second end portion of the outer cylinder, the yoke having an inner surface connecting to the magnetic means, the magnetic means being formed in a ring-shaped configuration.