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Rotary union with bellows seal

  • US 10,371,297 B2
  • Filed: 01/26/2017
  • Issued: 08/06/2019
  • Est. Priority Date: 02/01/2016
  • Status: Active Grant
First Claim
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1. A rotary union, comprising:

  • a housing having a fluid inlet;

    a rotating machine component rotatably supported in the housing;

    a rotating seal member associated with the rotating machine component;

    a non-rotating seal member slidably and sealably disposed within the housing adjacent the rotating seal member;

    an expandable seal disposed between and sealably engaging each of the non-rotating seal member and the housing;

    wherein the expandable seal includes two end portions, one of the two end portions engaged to the non-rotating seal member and the other of the two end portions engaged to the housing, and an expandable portion disposed axially between the two end portions, the expandable portion having an axial length that varies based on a pressure of a hydraulic fluid that is present at the fluid inlet;

    wherein the expandable portion includes at least one bellows; and

    wherein each of the two end portions has a hollow cylindrical shape that engages a corresponding bore in both the non-rotating seal member and the housing along its outer periphery.

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