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Vacuum toilet system

  • US 4,063,315 A
  • Filed: 08/16/1976
  • Issued: 12/20/1977
  • Est. Priority Date: 12/13/1974
  • Status: Expired due to Term
First Claim
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1. A method for filtering toilet bowl waste matter in an aircraft having a pressurized hull enclosing a passenger compartment, and recirculating the filtered liquid for flushing the toilet bowl, comprising the steps of:

  • mounting the toilet bowl having a valve controlled outlet, within the pressurized hull enclosing the passenger compartment of the aircraft;

    locating a central collection waste holding tank outside of the pressurized hull for establishing a pressure differential therebetween;

    dividing the waste holding tank by a filter element into a waste receiving compartment and a filtered liquid compartment;

    interconnecting the toilet bowl outlet valve with the waste receiving compartment of the waste holding tank;

    venting both the waste receiving compartment and the filtered liquid compartment of the waste holding tank to the outside ambient air pressure for producing a pressure differential between the interior of the waste holding tank and the pressurized passenger compartment containing the toilet bowl when the aircraft is above a predetermined altitude;

    connecting both the waste receiving compartment and the filtered liquid compartment of the waste holding tank to a vacuum pump for producing a pressure differential between the interior of the waste holding tank and the pressurized passenger compartment containing the toilet bowl when the aircraft is below said predetermined altitude;

    withdrawing fluid from the bottom of the filtered liquid compartment, and storing the fluid under pressure in an accumulator tank for use as flushing fluid;

    actuating an automatically time controlled flush cycle, for releasing the pressurized filtered flushing fluid from the accumulator tank through spray means mounted in the upper portion of the toilet bowl, in combination with opening the toilet bowl outlet valve for removing the waste and flushing liquid through the differential pressure acting upon it between the pressurized passenger compartment and the waste holding tank; and

    venting the toilet bowl to admit air from the pressurized passenger compartment into the interior of the toilet bowl for preventing the application of a suction force to the user during the vacuum flush cycle.

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