Shaft-cylinder assembly for high temperature operation

Abstract

The present invention provides a shaft-cylinder assembly for high-temperature operation comprising a dynamic sealing member having a helical coiled seal ring structure configured to be in contact with the shaft for providing dynamic sealing function; and a cylindrical cooling jacket positioned between the dynamic sealing member and the cylinder, and configured to circumferentially surround the dynamic sealing member and be circumferentially surrounded by the cylinder; wherein the cooling jacket includes one or more cooling channels, each of the one or more cooling channels is configured to circulate a cooling fluid for moving heat away from the dynamic sealing member.

What is claimed is: 
     
         1 . A shaft-cylinder assembly, comprising:
 a cylinder;   a shaft configured for moving in and along the cylinder;   a dynamic sealing member configured to be in contact with the shaft for providing dynamic sealing function; and   a cylindrical cooling jacket positioned between the dynamic sealing member and the cylinder, and configured to circumferentially surround the dynamic sealing member and be circumferentially surrounded by the cylinder;   wherein the cooling jacket includes one or more cooling channels, each of the one or more cooling channels is configured to circulate a cooling fluid for moving heat away from the dynamic sealing member.   
     
     
         2 . The shaft-cylinder assembly of  claim 1 , wherein each of the one or more cooling channels has an inlet configured for receiving the cooling fluid and an outlet configured for releasing the cooling fluid. 
     
     
         3 . The shaft-cylinder assembly of  claim 1 , further comprising a compression ring engaged with a compression spring configured for providing a pressing force on the dynamic sealing member to keep the dynamic sealing member intimately in contact with the cylinder. 
     
     
         4 . The shaft-cylinder assembly of  claim 4 , further comprising a pair of first and second holding rings for holding the dynamic sealing member and the compression ring inside the cooling jacket. 
     
     
         5 . The shaft-cylinder assembly of  claim 4 , wherein the cylindrical cooling jacket comprises a pair of first and second snap ring grooves formed on an interior wall of the cylindrical cooling jacket; wherein the first and second snap ring grooves are configured for engaging respectively with a pair of first and second snap rings which are fastened to the pair of first and second holding rings respectively for fixing the dynamic sealing member and the compression ring inside the cooling jacket. 
     
     
         6 . The shaft-cylinder assembly of  claim 1 , further comprising a static sealing ring between the cooling jacket and the cylinder for providing sealing function; and wherein the cooling jacket has a ring groove circumferentially formed on an outer wall of the cooling jacket for holding the static sealing ring on a fixed position around the cooling jacket. 
     
     
         7 . The shaft-cylinder assembly of  claim 1 , wherein the dynamic sealing member has a helical coiled seal ring.