Shaft mounted seal device and method for a scraped surface heat exchanger

Abstract

A scraped surface heat exchanger includes a seal assembly between a rotating tube and the end housing. The seal assembly is removable by removing the tube.

1 . A method of installing a seal on a scraped surface heat exchanger having a rotatable shaft, and an end cap, comprising: 
 urging a first seal component located at a first location on the shaft in a direction towards the end cap;    urging a second seal component located at a second location on the shaft outward of the first location into a receiving counter bore in the end cap so that the second seal component is frictionally maintained in the end cap; and    positioning the first and second seal components so they make sealing contact when the shaft rotates relative to the end cap.    
   
   
       2 . The method of  claim 1 , wherein the first seal component is a seal retainer and a spring biased sealing ring and wherein the second seal component is a seal seat.  
   
   
       3 . The method of  claim 1 , further comprising positioning a shaft end through a bore in an end cap of the scraped surface heat exchanger.  
   
   
       4 . The method of  claim 1 , wherein the second seal component has an outer diameter that frictionally fits inside an inner diameter of the receiving counter bore.  
   
   
       5 . The method of  claim 1 , wherein the first sealing member comprises a seal retainer mounted to the shaft by at least one pin connection, a groove containing a spring, and a seal ring having an annular L shaped cross section.  
   
   
       6 . A method of removing a seal from a scraped surface heat exchanger having a rotating shaft, and an end cap, comprising: 
 urging a first seal component located on the shaft at a first location in a direction away from the end cap;    removing a second seal component located at a second location on the shaft outward of the first location from a receiving counter bore in the end cap so that the second seal member is removed from the end cap; and    removing a shaft end from a bore in the end cap of the scraped surface heat exchanger;    
   
   
       7 . The method of  claim 6 , when the first seal component is a seal retainer and a spring biased sealing ring and wherein the second seal component is a seal seat.  
   
   
       8 . The method of  claim 6 , wherein the removing step includes contacting a lock ring against the second seal component.  
   
   
       9 . The method of  claim 6 , wherein the second seal component has an outer diameter that frictionally fits inside an inner diameter of the receiving counter bore.  
   
   
       10 . The method of  claim 6 , wherein the first sealing member comprises a seal retainer mounted to the shaft by at least one pin connection, a groove containing a spring, and a seal ring having an annular L-shaped cross section.