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Canned motor pump

  • US 4,684,329 A
  • Filed: 05/07/1986
  • Issued: 08/04/1987
  • Est. Priority Date: 01/08/1985
  • Status: Expired due to Term
First Claim
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1. In a canned motor pump comprising a pump section and a canned motor section connected thereto, the pump and motor sections having a common shaft mounted in front and rear bearings disposed on opposite sides of a stator that surrounds a rotor carried by the shaft in the motor section, there being a gap between the stator and the rotor, the front bearing being disposed between the rotor and the pump section, means to divert a portion of the pumped liquid from the pump section and to recycle the same to a lower pressure zone of the pump section after lubricating the front bearing but without flowing through said gap, and means to divert another portion of the pumped liquid from the pump section through said gap to a lower pressure zone of the pump section after lubricating the rear bearing;

  • the improvement in which the front bearing at its inner circumference has substantially higher resistance to liquid flow than the rear bearing at its inner circumference, and in which the rear bearing at its inner circumference has at least one channel therealong through which liquid can readily flow during rotation of the shaft, while the front bearing is free from such a channel.

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