[특허]Seal and bearing-free fluid pump incorporating a passively suspended self-positioning impeller

[미국특허] Seal and bearing-free fluid pump incorporating a passively suspended self-positioning impeller 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F04B-017/00 H02K-007/09
출원번호	US-0440578 (2003-05-19)
발명자 / 주소	Izraelev,Valentin M.
출원인 / 주소	Advanced Bionics, Inc.
대리인 / 주소	Haugen Law Firm PLLP
인용정보	피인용 횟수 : 9 인용 특허 : 26

초록 ▼

A novel fluid pump includes a stator body defining a pumping chamber and an impeller operationally disposed within the chamber. The impeller has opposed ends with a central axis defining an axis of rotation. Passive magnetic bearing sets are positioned along the impeller body with each bearing set being similarly polarized so as to be in mutually attracting or mutually repelling relationship. A third passive magnetic bearing set is positioned along the impeller axis between the opposed ends with the third bearing set being magnetically coupled similarly to the first and second bearing sets, with the passive magnetic bearings creating an unstable negative force in a plane perpendicular to the axis of rotation of the impeller with the negative stiffness being overcome upon rotation of the impeller creating a centrifugal force of a magnitude greater than that of the unstable negative force.

대표청구항 ▼

What is claimed is: 1. A fluid pump comprising: (a) a housing with an inner wall defining a chamber having an axis and having opposed ends disposed coaxially with said chamber; (b) a rotor having opposed first and second ends and being operationally disposed within said chamber and having a rotor axis defining an axis of rotation, said rotor comprising: (i) a rotor body having a relative density substantially less than that of the respective fluid being pumped; (ii) a configuration defining a surface of revolution with an axial length defined between said first and second ends and providing a predetermined clearance between said rotor and said first and second ends, and with a diameter of said rotor body transverse to said axis of rotation being selected to provide a predetermined radial clearance between an outer surface of said rotor body and the inner wall of said housing, the clearances between said rotor and said housing being sufficiently large so as to render the effects of hydrodynamic bearings ineffective in stably supporting said rotor; (c) drive magnets disposed on said rotor and being positioned radially outwardly of said rotor axis generally medially of said first and second ends; (d) an electromagnetic drive mechanism coupled to a source of energy and arranged along said housing to deliver rotational driving energy to said rotor through said drive magnets; and (e) a plurality of passive magnetic bearing sets disposed on said housing and said rotor, said passive magnetic bearing sets including first and second magnetic bodies in mutually magnetically coupled relationship, with the first magnetic bodies of each bearing set being mounted on said rotor and with the second magnetic bodies of each bearing set being mounted along the inner wall of said housing, said first magnetic bodies being disposed adjacent to and in magnetically coupled relationship to respective second magnetic bodies to form respective bearing sets, each of said first and second magnetic bodies solely comprising a permanent magnet, each of the said first and second magnetic bodies comprising each of said passive magnetic bearing sets being polarized and positioned in mutually attracting or mutually repelling relationship so as to function as bearings selected from the group consisting of radial and thrust, said plurality of passive magnetic bearing sets being further arranged to form a passive suspension for said rotor within said housing, with said passive suspension having negative stiffness only in directions perpendicular to the rotor axis of rotation, such negative stiffness being of a magnitude such that centrifugal forces developed during rotation of said rotor overcome said negative stiffness and create positive stiffness of said rotor suspension in all required degrees of freedom. 2. The fluid pump of claim 1 wherein said housing has an inlet port at one end of said housing and in substantial coaxial relationship with said chamber axis, and an outlet port disposed on the wall of said housing generally medially of said chamber axis. 3. The fluid pump of claim 2 wherein the outer surface of said rotor body has a plurality of radially extending vanes. 4. The fluid pump of claim 1 wherein said housing includes an inlet port and an outlet port oppositely disposed at respective opposed ends thereof in coaxial relationship with said chamber axis. 5. The fluid pump of claim 2, including one or more spaced apart disks radially disposed about said chamber axis and integrally coupled to said rotor for assisting in pumping the fluid through said pump. 6. The fluid pump of claim 1 wherein selected of said second magnetic bodies of at least one passive magnetic bearing set are operationally disposed in spaced apart relationship from said housing. 7. The fluid pump of claim 1, including at least one passive electrostatic bearing set.

이 특허에 인용된 특허 (26) 인용/피인용 타임라인 분석

Rafferty Edson Howard (Excelsior MN) Kletschka Harold D. (Minneapolis MN), Apparatus for use with delicate fluids.
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Isaacson Milton S. (Dayton OH) Lioi Anthony P. (Round Rock TX), Axial flow blood pump with hydrodynamically suspended rotor.
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Izraelev Valentin M. (Eden Prairie MN), Bearing and seal-free blood pump.
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Antaki James F. ; Paden Bradley ; Burgreen Gregory ; Groom Nelson J., Blood pump having a magnetically suspended rotor.
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Isenberg Gerhard (Dachau DT) Bloch Peter (Dachau DT) Tuzinsky Wolfgang (Munich DT), Flow machine for an aggressive, radioactive or special-purity flow medium.
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Kletschka Harold D. (1925 Noble Dr. Minneapolis MN 55422), Fluid pump with levitated impeller.
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Kletschka Harold D. (1925 Noble Dr. Minneapolis MN 55422), Fluid pump with magnetically levitated impeller.
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Kletschka Harold D. (1925 Noble Dr. Minneapolis MN 55422), Fluid pump with magnetically levitated impeller.
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Isaacson, Milton S., Hydrodynamic bearing system for a brushless DC motor.
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Isaacson Milton S. (Dayton OH) Lioi Anthony P. (Dayton OH), Hydrodynamically suspended rotor axial flow blood pump.
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Cooper Paul (Titusville NJ) Bulson Lee J. (Riegelsville PA), Integrated centrifugal pump and motor.
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Jarvik Robert K. (124 W. 60th St. New York NY 10023), Intraventricular artificial hearts and methods of their surgical implantation and use.
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Arnold John R. (666 Seminole Dr. Winter Park FL 32789), Left ventricular assist device and method for temporary and permanent procedures.
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Olsen Don B. (8832 Blue Jay La. Salt Lake City UT 84121) Bramm Gnter (Luisen Str. 49 8000 Munich 2 DEX) Novak Pavel (Grres Str. 2 D-8000-Munich 40 DEX), Magnetically suspended and rotated impellor pump apparatus and method.
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Bramm Gunter L. (Munich UT DEX) Olsen Don B. (Salt Lake City UT), Magnetically suspended and rotated rotor.
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Bramm Gunter W. (Luisen Strasse 49 8000 Munchen 2 UT DEX) Olsen Don B. (8832 Blue Jay La. Salt Lake City UT 84121), Magnetically suspended and rotated rotor.
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Bramm Gunter W. (Munich UT DEX) Olsen Don B. (Salt Lake City UT), Magnetically suspended and rotated rotor.
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Bramm Gunter W. (Munich UT DEX) Olsen Don B. (Salt Lake City UT), Magnetically suspended and rotated rotor.
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Edward K. Prem, Magnetically suspended fluid pump and control system.
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Moise John C. (Carmichael CA), Magnetically suspended rotor axial flow blood pump.
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Becker Willi (Braunfels DT), Pump construction.
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Rafferty Edson Howard (Excelsior MN) Kletschka Harold D. (Minneapolis MN), Pumping apparatus and process characterized by gentle operation.
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Golding Leonard A. R. (Moreland Hills OH) Smith William A. (Lyndhurst OH) Wade Warren F. (Orange Village OH), Sealless heart pump.
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Isaacson Milton S. (Dayton OH), Split stator for motor/blood pump.
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Izraelev, Valentin M., System for passive and stable suspension of a rotor in rotor/stator assemblies.
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Isenberg Gerhard (Dachau DT) Tuzinsky Wolfgang (Munich DT), Vacuum pump having a rotor supported in the interior of its casing.
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Tansley, Geoffrey Douglas; Cook, Martin Christopher; Woodard, John Campbell, Axial flow blood pump.
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Tansley, Geoffrey Douglas; Cook, Martin Christopher; Woodard, John Campbell, Axial flow blood pump.
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Post, Richard F, Electrostatic stabilizer for a passive magnetic bearing system.
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Post, Richard F, Electrostatic stabilizer for a passive magnetic bearing system.
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Veltri, Jeffrey Allan, Flywheel energy system.
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Veltri, Jeffrey A.; MacNeil, Cody J., High-voltage flywheel energy storage system.
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Veltri, Jeffrey A.; MacNeil, Cody J., High-voltage flywheel energy storage system.
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[미국특허] Seal and bearing-free fluid pump incorporating a passively suspended self-positioning impeller 원문보기

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[미국특허] Seal and bearing-free fluid pump incorporating a passively suspended self-positioning impeller 원문보기

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