Patent ID: 9381285
Filing Date: 2016-07-05
CPC Classification: A61M,F04D,F16C

Claim Text:
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 with said diaphragm being interposed, comprising: a first magnetic element provided in a first surface of said impeller; a second magnetic element provided in a planar surface of said first chamber facing the first surface of said impeller, for attracting said first magnetic element; a third magnetic element provided in a second surface of said impeller and attracted by said drive unit during rotation of said impeller, a first attractive force between said first and second magnetic elements and a second attractive force between said third magnetic element and said drive unit causing said impeller to be located substantially in a center of a movable range of said impeller in said first chamber; a plurality of first grooves and a plurality of second grooves, wherein: a plurality of third grooves and a plurality of fourth grooves, wherein: wherein at least one of a width and a depth of said plurality of second grooves is different from that of said plurality of first grooves, and at least one of a width and a depth of said plurality of fourth grooves is different from that of said plurality of third grooves.