Sealing device for rotary feedthrough

Abstract

A sealing device for a rotary feedthrough for receiving a rotating machine element whose outer side can be applied to another machine element includes at least two sealing elements disposed in tandem in the axial direction of the machine element. Inner sides of the sealing elements are configured for forming an active sealing connection with the rotating machine element. At least one of the sealing elements can be pressurized with an additional force acting in the radial direction so that the force of compression acting on the rotating machine element for the at least one of the sealing elements can be adjusted relative to the force of compression acting on the rotating machine element due to at least one other sealing element.

1 . Sealing device for a rotary feedthrough for receiving a rotating machine element whose outer side can be applied to another machine element, comprising at least two sealing elements disposed in tandem in an axial direction of the rotating machine element, the at least two sealing elements having inner sides configured for forming an active sealing connection with the rotating machine element, and means for pressurizing at least one of the sealing elements with an additional force acting in a radial direction so that force of compression acting on the rotating machine element for the at least one of the sealing elements relative to force of compression acting on the rotating machine element for at least one other of the sealing elements can be adjusted. 
   
   
       2 . Sealing device according to  claim 1 , wherein the means for pressurizing with the additional force comprises a spring element. 
   
   
       3 . Sealing device according to  claim 2 , wherein the spring element is adjacent to the at least one of the sealing elements and is manufactured of a non-conductive material. 
   
   
       4 . Sealing device according to  claim 2 , wherein the spring element comprises a ring of a polymer material. 
   
   
       5 . Sealing device according to  claim 2 , wherein the at least one of the sealing elements itself forms the spring element and comprises a cavity pressurized with an internal pressure. 
   
   
       6 . Sealing device according to  claim 2 , wherein the at least one of the sealing elements participates in the formation of the spring element with a cavity which can be pressurized with an internal pressure. 
   
   
       7 . Sealing device according to  claim 2 , wherein between two of the sealing elements at least one gas suction duct for generating a low pressure is disposed. 
   
   
       8 . Sealing device according to  claim 7  wherein said at least one as suction duct generates an intermediate vacuum.