Patent ID: 8678798
Filing Date: 2014-03-25
Classification: F04C

Abstract:
1. A rotary pump device comprising: a rotary pump which includes an outer rotor and an inner rotor and which is driven by a drive shaft; a cylinder which forms a rotor chamber in which the rotary pump is housed, and forms a mechanical seal by coming into contact with one end face in an axial direction of the outer rotor and the inner rotor, and which includes a center hole into which the drive shaft is inserted; and a seal mechanism which forms the rotor chamber together with the cylinder, and which includes a hollow plate-shaped resin member having a seal surface that comes into contact with another end face in the axial direction of the outer rotor and the inner rotor, and a hollow portion into which the drive shaft is inserted, the seal mechanism pressing the seal surface against the rotary pump by introducing a discharge pressure of the rotary pump to a side of the resin member that is opposite to the rotary pump, and the seal mechanism including a reinforcing ring in the hollow portion of the resin member, the reinforcing ring being formed of a material whose hardness is higher than that of the resin member, and having an inner peripheral surface that is caused to be slidably in contact with the drive shaft.