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Uninterruptible oil supply system

  • US 6,463,819 B1
  • Filed: 10/24/2000
  • Issued: 10/15/2002
  • Est. Priority Date: 10/24/2000
  • Status: Expired due to Term
First Claim
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1. An oil supply system for supplying oil under pressure to an enclosure, the system comprising:

  • a closed oil storage tank containing a volume of oil below a gas filled headspace, the tank having a primary drain in a bottom portion;

    a pressure pump having;

    a pump inlet communicating with the tank drain; and

    a pump outlet;

    an oil-air separator with;

    an inlet communicating with an enclosure outlet;

    an air outlet venting separated air; and

    an oil outlet;

    an auxiliary tank outlet disposed above the drain;

    the oil-air separator having an auxiliary inlet communicating with the auxiliary tank outlet; and

    a unitary valve and directional switch having;

    a primary oil inlet communicating with the pressure pump outlet;

    a gas pressure inlet communicating with gas within the enclosure;

    an auxiliary oil inlet in communication with the oil outlet of the separator;

    an oil return outlet in communication with an oil tank return inlet; and

    an oil supply outlet in communication with the enclosure, the unitary valve and directional switch;

    connecting the switch auxiliary oil inlet to the switch oil return outlet when oil pressure, relative to gas pressure in the enclosure, delivered by the pressure pump exceeds a predetermined minimum threshold pressure differential; and

    connecting the switch auxiliary oil inlet to the oil supply outlet when oil pressure, relative to gas pressure in the enclosure, delivered by the pressure pump is less than the threshold pressure differential.

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