Patent ID: 9067005
Filing Date: 2015-06-30
Classification: A61M,F04D,F16C,H02K

Abstract:
1. A centrifugal pump apparatus including a housing having first and second chambers partitioned from each other by a diaphragm, an impeller rotatably provided in said first chamber along said diaphragm, for delivering liquid by centrifugal force during rotation, and a drive unit provided in said second chamber for driving said impeller to rotate via said diaphragm, comprising: a first magnetic material provided in one surface of said impeller; a second magnetic material provided in an inner wall of said first chamber facing the one surface of said impeller, for attracting said first magnetic material; a plurality of third magnetic materials provided in the other surface of said impeller, and arranged along a single circle such that adjacent magnetic polarities thereof are different from each other, wherein said drive unit includes a control unit that causes said impeller to contact said diaphragm prior to activation of said impeller to rotate, by causing a current to flow through said plurality of coils such that said second attractive force becomes higher than said first attractive force; and first grooves for a hydrodynamic bearing formed in the one surface of said impeller or in the inner wall of said first chamber facing the one surface, and second grooves for the hydrodynamic bearing formed in the other surface of said impeller or in said diaphragm facing the other surface; wherein each of said first to third magnetic materials is a permanent magnet.