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Apparatus for low noise flushing a vacuum toilet, especially in an aircraft

  • US 5,317,763 A
  • Filed: 01/25/1993
  • Issued: 06/07/1994
  • Est. Priority Date: 01/25/1992
  • Status: Expired due to Term
First Claim
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1. An apparatus for flushing a vacuum toilet, especially in an aircraft, comprising a toilet bowl installed on a floor in said aircraft, a waste collecting container, a conduit connecting said toilet bowl to said waste collecting container, a suction valve in said conduit near said toilet bowl, a flush water valve connecting to said toilet bowl, means for energizing said suction valve and said flush water for predetermined lengths of time, a by-ass flow valve (9) for supplying waste transporting air into said conduit downstream of said suction valve as viewed in the flow direction from said toilet bowl to said waste collection container, a coupling connecting said by-pass flow valve to said conduit, and means connecting said by-pass flow valve for a fixed length of time, wherein said energizing means comprise a control unit including a timer for first energizing said suction valve (7) for a first length of time of about one second and then energizing said by-pass flow valve (9) for a second length of time of about three seconds, said apparatus further comprising an air intake connected to said by-pass flow valve, said air intake comprising noise damping features for damping noise caused by air flowing through said air intake and a one-way flow device (10) connected in a pipe between said air intake and said by-pass flow valve, said one-way flow device permitting air flow from said air intake to said by-pass flow valve and preventing fluid flow from said by-pass flow valve to said air intake.

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