Sealing Device for Oil Tank

Abstract

A sealing device for an oil tank is mounted between a tank body and a floating roof and includes a fixed bracket, an inner layer plate secured to the fixed bracket, at least one inner spring plate secured on an annular inner diameter of the inner layer plate and applying a force directed toward an outer diameter of the inner layer plate, an outer layer plate arranged on an exterior face of the inner layer plate, with a gap being defined between an interior face of the outer layer plate and the exterior face of the inner layer plate, and at least one outer spring plate arranged in the gap between the outer layer plate and the inner layer plate and applying a force directed toward an outer diameter of the outer layer plate.

1 . A sealing device for an oil tank, comprising:
 a fixed bracket;   an inner layer plate secured to the fixed bracket;   at least one inner spring plate secured on an annular inner diameter of the inner layer plate and applying a force directed toward an outer diameter of the inner layer plate;   an outer layer plate arranged on an exterior face of the inner layer plate, with a gap being defined between an interior face of the outer layer plate and the exterior face of the inner layer plate; and   at least one outer spring plate arranged in the gap between the outer layer plate and the inner layer plate and applying a force directed toward an outer diameter of the outer layer plate;   wherein:   the inner layer plate has a radially sectional face that is curved to form a closed annular shape;   the inner layer plate forms a circle surrounding the fixed bracket;   the outer layer plate forms a circle surrounding the inner layer plate; and   the interior face of the outer layer plate and the exterior face of the inner layer plate are locally separated to form the gap.   
     
     
         2 . The sealing device for an oil tank of  claim 1 , wherein the at least one inner spring plate has a radially sectional face having a vortex shape. 
     
     
         3 . The sealing device for an oil tank of  claim 1 , wherein the outer layer plate has a free end spaced from the inner layer plate to form the gap. 
     
     
         4 . The sealing device for an oil tank of  claim 1 , wherein the at least one outer spring plate has a substantially U-shaped configuration, and has a first end secured to the fixed bracket and a second end contacting the interior face of the outer layer plate. 
     
     
         5 . The sealing device for an oil tank of  claim 1 , wherein the sealing device includes multiple inner spring plates that are centered at a center of the inner layer plate and are arranged in a radiating shape. 
     
     
         6 . The sealing device for an oil tank of  claim 1 , wherein the sealing device includes multiple outer spring plate that are centered at a center of the inner layer plate and are arranged in a radiating shape. 
     
     
         7 . The sealing device for an oil tank of  claim 1 , wherein the outer layer plate includes a metallic sheet plate and a fiber layer mounted on an exterior face of the metallic sheet plate. 
     
     
         8 . The sealing device for an oil tank of  claim 7 , wherein the fiber layer is made of carbon fiber. 
     
     
         9 . The sealing device for an oil tank of  claim 7 , wherein the fiber layer is made of glass fiber.