| 摘要 |
PROBLEM TO BE SOLVED: To prevent blood as a working fluid flowing through a gap of an impeller dynamic pressure bearing of an artificial heart pump from recirculating from an outflow part of an impeller; and to receive thrust force with just a thrust dynamic pressure bearing. SOLUTION: The impeller 5 comprises an impeller main body 8 and the impeller bearing member 9. A permanent magnet 21 is provided along a cylindrical surface 7, and a vane 6 is radially provided on a bottom surface. A casing bearing member 17 is provided on an inner casing 4, a radial dynamic pressure bearing is formed whose dynamic pressure grooves are provided either on a peripheral surface 13 of an upper cylindrical part 11 of the impeller bearing member 17 or a cylindrical inner surface 18 of the casing bearing member 17, and the thrust dynamic pressure bearing is formed whose dynamic pressure grooves are provided either on an upper surface 15 of the impeller bearing member 17 or a lower end surface 19 of the casing bearing member 17. The dynamic pressure grooves lead the working fluid from an impeller inflow part so that the fluid can be discharged from the outflow part. When the impeller 5 is rotating, it is lifted and its thrust force is received with just the thrust dynamic pressure bearing. COPYRIGHT: (C)2007,JPO&INPIT
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