公开(公告)号：US3613734A

公开(公告)日：1971-10-19

申请号：US3613734D

申请日：1969-09-25

Applicant: ADAM ELMER

Inventor： ELMER ADAM

IPC: F15B1/24 ,  F16L55/04

CPC classification number: F15B1/24 ,  F15B2201/205 ,  F15B2201/312 ,  F15B2201/3158 ,  F15B2201/4155

Abstract: A hydraulic accumulator cylinder encloses an elastically compressible and expansible gas cushion separated from the hydraulic fluid by a floating piston having sealing and guiding rings. The cylinder has one end wall formed with a substantially central hydraulic fluid inlet and outlet opening, the inner surface of this one end wall defining a bowl shape concavity. An additional ring on the piston constitutes a dirt stripper, and the face of the piston toward the one cylinder end wall is formed with a frustoconical protrusion which, when the maximum amount of fluid has been withdrawn from the cylinder, enters the opening. The piston is formed with an annular bearing surface around the protrusion and engageable with a stationary sealing ring on a countersurface in the concavity, the sealing ring acting as a seal only when the piston is pressed against the countersurface by the gas pressure. In this position of the piston, the piston and the one cylinder end wall define an annular chamber in which there remains a residual amount of fluid serving as a liquid barrier against the gas enclosed in the cylinder.