×

Bearings with hardened rolling filements and polymeric cages for use submerged in very low temperature fluids

  • US 20020094286A1
  • Filed: 12/08/2000
  • Published: 07/18/2002
  • Est. Priority Date: 12/04/1995
  • Status: Active Grant
First Claim
Patent Images

1. A magnetic drive pump for use in pumping a very low temperature fluid at less than about −

  • 100degrees centigrade comprising;

    a back plate having a rotatable shaft journaled therein said rotatable shaft having a first end and a second end journaled in a bearing comprised of a hardened race in said back plate, a plurality of ceramic rolling filaments in said race, and a retainer comprised of a polymeric material holding said rolling filement is spaced apart position about said race;

    an impeller mounted to a first end of said rotatable shaft;

    a first magnet comprising a first material having coefficient of thermal expansion mounted to a second end of said rotatable shaft and contained within a casing mounted to said rotatable shaft, said casing comprising a material having a second coefficient of thermal expansion greater than the first coefficient of thermal expansion of the material comprising said magnet;

    said back plate being mounted within a housing having openings formed therein for intake and exhaust of a fluid to be pumped at very low temperature; and

    a second magnet positioned in close proximity to said housing for rotation therearound and adapted for mounting to the shaft of a motor for rotating said first magnet in the housing.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×