Pressure accumulator

DETAILED DESCRIPTION Having thus described the invention and illustrated its use, what is claimed as new and is desired to be secured by Letters Patent in the United States is: 1.
An accumulator comprising a shell having an upper concave half including a apex coincident with the axis of said shell, a gas sealing opening formed substantially at said apex of said shell, a holder mounted in said shell, a bladder mounted on said holder, a convex member disposed in said upper concave half of said shell, the curvature of said convex member corresponding substantially to the curvature of said concave half, said convex member being disposed in registry with an in proximate spaced relation to said apex of said shell, said convex member being movable axially toward and away from said apex, and an annular elastic seal member interposed between said convex member and said upper concave half, said seal member being positioned to define a seal between said convex member and said upper concave half in an area surrounding said opening when said convex member is shifted toward said apex.
2.
An accumulator in accordance with claim 1 wherein said seal member comprises an O-ring mounted on said convex member.
3.
An accumulator in accordance with claim 2 wherein said convex member includes an annular groove and said O-ring is mounted in said groove.




Description:
The present design concerns an improvement to the accumulator.
To describe it more specifically, the design offers an improved sealing structure for the opening of the accumulator which confines the gases.
Well-known designs for conventional accumulators, such as disclosed in Japanese U.
M.
application No.
56/24321, filed Feb.
23, 1981, are shown in FIGS.
1 and 2 and are characterized by the fact that an amply elastic rubber bladder (b) placed in the interior space (a) seals nitrogen gas within.
The elasticity of this bladder serves to maintain the pressure of the fluid body.
In such structures, the nitrogen gas entering through gas-sealing opening (d) created at the top of the shell (c) is contained by a sealing structure (FIG