초록 ▼

A shaft seal assembly comprises contact seal rings which are inserted into a recess formed within labyrinth seal rings encompassing the shaft. The contact seal rings are adapted to be in sealing engagement with the shaft when the shaft is not rotating or the shaft speed is relatively slow. The conta

A shaft seal assembly comprises contact seal rings which are inserted into a recess formed within labyrinth seal rings encompassing the shaft. The contact seal rings are adapted to be in sealing engagement with the shaft when the shaft is not rotating or the shaft speed is relatively slow. The contact seal rings are moved radially outward with respect to the rotary shaft when the shaft speed is increased. Buffer liquid generates the force to move the contact seal rings radially outward from sealing engagement with the shaft and at the same time establishes a barrier for process fluid when the shaft speed is increased.

대표청구항 ▼

A shaft seal assembly for a rotary machine, wherein a process fluid contained within a relatively high pressure region of the rotary machine is prevented from escaping to surrounding regions of relatively lower pressure, comprising: first seal means encompassing the rotary shaft in a spaced relation

A shaft seal assembly for a rotary machine, wherein a process fluid contained within a relatively high pressure region of the rotary machine is prevented from escaping to surrounding regions of relatively lower pressure, comprising: first seal means encompassing the rotary shaft in a spaced relationship to provide a first fluid flow restriction along the shaft, second seal means including a plurality of circumferentially extending segments also encompassing said shaft for providing a further flow restriction along the shaft and including means for generating a first force of a predetermined magnitude for maintaining the segments of said second seal means in contact sealing engagement with said shaft and means responsive to fluid pressure for opposing said means for generating a first force to move the segments of said second seal means out of contact sealing engagement with said shaft, and conduit means for delivering a fluid to said first and second seal means and including a first fluid path means for delivering fluid to said first seal means wherein fluid is discharged into said first fluid flow restriction to act as a buffer fluid to prevent said process fluid from passing from the high pressure region to the surrounding region and second fluid path means for delivering a portion of said delivered fluid to said means responsive to fluid pressure whereby as the pressure of said delivered fluid is increased said first seal means becomes more effective and the segments of said second seal means are moved out of contact sealing engagement.