Patent ID: 9328746
Filing Date: 2016-05-03
CPC Classification: F15B

Claim Text:
1. An accumulator comprising: an accumulator housing which has a port hole connected to a pressure piping of a device; a bellows and a bellows cap which is arranged in an inner portion of said housing so as to partition an internal space of said housing into a gas chamber to which a high-pressure gas is charged and a liquid chamber which is communicated with said port hole; and a seal member which is retained to the port hole side of said bellows cap via a seal holder, wherein said seal member includes a discoid rigid plate, a flexible portion constructed by an elastomeric material and attached to an outer peripheral surface of the rigid plate, and a seal projection positioned on an end surface of the rigid plate, the end surface being close to the port hole side of the rigid plate, wherein said seal member moves together with said bellows cap at a steady activating time, said seal projection comes into contact with a seal portion which is provided in an inner portion of said housing so as to occlude said liquid chamber to confine a partial liquid in the liquid chamber in the case that an operation of said device stops and the pressure within said pressure piping is lowered, and said seal projection moves in a direction that said bellows cap moves away from said seal portion while shear deforming the flexible portion of said seal member while being in contact with said seal portion in the case that the liquid confined in said liquid chamber thermally expands in a state in which said liquid chamber is occluded, and wherein said flexible portion is configured to allow relative movement of said bellows cap by shear deformation on the basis of engagement with said seal holder.