Patent ID: 7537437
Filing Date: 2009-05-26
Classification: F04B,H01F,H02K

Abstract:
1. A pump device comprising: a fixed body in which a pump chamber in communication with a fluid suction port and a fluid discharge port is constructed; a valve element for expanding and contracting an internal volume of the pump chamber to perform suction and discharge of fluid; and a drive mechanism for driving the valve element which comprises: wherein the rotation body comprises a cup-shaped member that is coaxially disposed on an inner side of the stator; the movable body is provided with a cylindrical center part at a center of the movable body that is coaxially disposed on an inner side of the cup-shaped member; the valve element is a diaphragm valve that partitions the pump chamber; an outer peripheral edge part of the diaphragm valve is fixed to the fixed body; a center part of the diaphragm valve is fixed to the cylindrical center part of the movable body; a cylindrical body part between the outer peripheral edge part and the center part of the diaphragm valve is disposed so that a U-shaped portion is formed on the inner side of the cup-shaped member of the rotation body; and the U-shaped portion of the cylindrical body part is moved on the inner side of the cup-shaped member of the rotation body when the internal volume of the pump chamber is expanded and contracted by the diaphragm valve.