Seal device

Abstract

Primary objective of the present invention is to provide a seal device for effecting a seal against a high temperature, high pressure fluid and to maintain seal surfaces thereof in a sealing contact relation with mount surfaces regardless of the displacement of the mount surfaces. The seal device is comprised of a first seal portion, a second seal portion, a joint base a first seal face and a second seal face, wherein the first seal portion has a first elastic portion at one side of a first bight portion and a second elastic portion at the other side of the first bight portion, wherein the second seal portion has a first symmetrical elastic portion at one side of a second bight portion and a second symmetrical elastic portion at the other side of the second bight portion, wherein the joint base is deflected and joining the second elastic portion of the first seal portion and the second symmetrical elastic portion of the second seal portion such that the second elastic portion and the second symmetrical elastic portion are aligned in parallel with one another, wherein the first seal face is disposed on a first outmost circumferential surface of the first elastic portion, wherein the second seal face is disposed on a second outmost circumferential surface of the first symmetrical elastic portion, wherein a side surface of the second elastic portion and a side surface of the second symmetrical elastic portion are in a contact relation or in a proximity contact relation with one another in an opposing manner at the joint base.

1 . A seal device for effecting a seal by being brought into sealing contact with mount surfaces of assembly components, said seal device comprising: 
 a) a first seal portion having a first elastic portion with a flat side surface at one side of a first bight portion formed from elastic sheet material having a bent cross-section and a second elastic portion formed from elastic sheet material at the other side of said first bight portion;    b) a second seal portion having a first symmetrical elastic portion with a flat side surface at one side of a second bight portion formed from elastic sheet material having a bent cross-section and a second symmetrical elastic portion formed from elastic sheet material at the other side of said second bight portion;    c) a joint base being deflected and joining a side surface of said second elastic portion of said first seal portion and a side surface of said second symmetrical elastic portion of said second seal portion in a contact state;    d) a first seal face being disposed on a first outmost circumferential surface of said first elastic portion; and    e) a second seal face being disposed on a second outmost circumferential surface of said first symmetrical elastic portion, wherein said first seal portion and said second seal portion are forced to undergo elastic deformation to separate from said contact state between said side surface of said second elastic portion, and wherein said side surface of said second symmetrical elastic portion toward said joint base as an interval with said first seal face and said second seal face decreases.    
   
   
       2 . A seal device as claimed in  claim 1 , wherein said joint base is arranged to form a circular cross section and to retain an annular space portion therewithin.  
   
   
       3 . A seal device as claimed in  claim 1 , wherein said first seal face and said second seal face are located at more distal positions from said first bight portion and said second bight portion, respectively, than said joint base.  
   
   
       4 . A seal device as claimed in  claim 1 , wherein a side surface of said second elastic portion and a side surface of said second symmetrical elastic portion are held in the contact state by the elasticity of the joint base.  
   
   
       5 . A seal device as claimed in  claim 1 , wherein said first seal portion and said second seal portion are integrally constructed by inflecting a nickel-based alloy sheet or heat resistive alloy sheet.