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Thrust controlled rotary apparatus

  • US 4,170,435 A
  • Filed: 10/14/1977
  • Issued: 10/09/1979
  • Est. Priority Date: 10/14/1977
  • Status: Expired due to Term
First Claim
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1. Rotary apparatus comprising:

  • an outer body member having an internal generally axially directed first thrust area;

    an inner body member mounted at least partially within said outer body member for relative rotation of said body members and having a second generally axially directed thrust area generally opposed to said first thrust area;

    wherein said body members define fluid passageway means and said thrust areas define a fluid-receiving space therebetween in communication with said passageway means;

    first annular seal means sealing between said thrust areas;

    second annular seal means of lesser diameter than said first seal means and also sealing between said thrust areas, whereby an annular first portion of said fluid-receiving space is defined between said two seal means;

    said apparatus defining two gaps located respectively an opposite sides of said first and second seal means from said first portion of said fluid-receiving space, and said gaps each communicating with a respective one of two zones of differing pressure external to said first portion;

    and thrust control means for selectively varying the fluid pressure in said first portion of said fluid-receiving space, said thrust control means including means for selectively providing pressuring equalizing communication between said first portion and said two gaps.

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