Dielectric Insulation Gasket for a Vacuum Bottle

Abstract

The gasket makes it possible for the apparatus, in particular the vacuum bottle, to be assembled and disassembled relatively easily and conveniently. It imparts high dielectric performance to the apparatus. The inside and the outside contact surfaces of the gasket are smooth, and, for example, each of them can be made up of two cylindrical portions ( 31 A & 31 B; 32 A & 32 B) of different concinnities. At least one of the side surfaces has an annular recess ( 35 ). Application to switchgear using vacuum bottles for operating at high and medium voltages.

1 . A dielectric insulation gasket for a vacuum bottle, said gasket being designed to insulate a vacuum bottle by using at least one gasket around the vacuum bottle inside a casing, the gasket having an inside contact surface and an outside contact surface, two side surfaces interconnecting the inside and the outside contact surfaces;
 said gasket being characterized in that an inside contact surface of the casing and an outside surface of the of the vacuum bottle being smooth, the inside contact surfaces and outside contact surfaces of the gasket are smooth, presenting no cavity and forming part of a group constituted by surface shapes comprising surfaces that are convex relative to the longitudinal axis of the gasket and the surfaces presenting a gradient that does not reverse relative to the longitudinal axis of the gasket,   in such a manner, that when assembling the gasket, no gas pockets are trapped in the interfaces, neither between the inside contact surface of the casing and the outside contact surface of the gasket nor between the outside surface of the vacuum bottle and the inside surface of the gasket, thereby removing any risk of partial electrical discharges appearing between, firstly the inside contact surface of the casing and the outside contact surface of the gasket and secondly between the outside contact surface of the vacuum bottle and the inside contact surface of the gasket.   
   
   
       2 . A gasket according to  claim 1 , characterized in that the axial height of the inside contact surface and of the outside contact surface is equal to or greater than 5 mm. 
   
   
       3 . A gasket according to  claim 1 , characterized in that the minimum thickness of the gasket along the longitudinal axis of the gasket is 4 mm. 
   
   
       4 . A gasket according to  claim 1 , characterized in that the inside contact surface and the outside contact surface are cylindrical relative to the gasket axis. 
   
   
       5 . A gasket according to  claim 1 , characterized in that the outside contact surface and the inside contact surface are conical. 
   
   
       6 . A gasket according to  claim 1 , characterized in that the inside contact surface and the outside contact surface are each made up of two conical portions having different inclinations and interconnected via a determined interconnection curve (RE, RI) forming a flared V-shape. 
   
   
       7 . A gasket according to  claim 5 , characterized in that the inside contact surface and the outside contact surface are of general direction inclined relative to the axis of the gasket, i.e. of conical general direction. 
   
   
       8 . A gasket according to  claim 1 , characterized in that its cross-section is provided with a recess. 
   
   
       9 . A gasket according to  claim 1 , characterized in that each of the side surfaces is made up of a convex portion and of a concave portion. 
   
   
       10 . A gasket according to  claim 1 , characterized in that the cross-section of the gasket is H-shaped. 
   
   
       11 . A gasket according to  claim 1 , characterized in that the side surfaces are made up of two portions of different inclinations. 
   
   
       12 . A gasket according to  claim 1 , characterized in that at least one side surface is rounded. 
   
   
       13 . A gasket according to  claim 1 , characterized in that the cross-section of the gasket is square in shape. 
   
   
       14 . A gasket according to  claim 2 , characterized in that the cross-section of the gasket is rectangular in shape. 
   
   
       15 . A gasket according to  claim 1 , characterized in the cross-section of the gasket is trapezium-shaped. 
   
   
       16 . A gasket according to  claim 1 , characterized in that its cross-section is N-shaped. 
   
   
       17 . A gasket according to  claim 1 , characterized in that its cross-section is M-shaped. 
   
   
       18 . A gasket according to  claim 1 , characterized in that its cross-section is U-shaped. 
   
   
       19 . A gasket according to  claim 1 , characterized in that its cross-section is W-shaped. 
   
   
       20 . A gasket according to  claim 6 , characterized in that the inside contact surface and the outside contact surface are of general direction inclined relative to the axis of the gasket, i.e. of conical general direction.