Accumulator with low permeability flexible diaphragm

Details Accumulator with low permeability flexible diaphragm Accumulator with low permeability flexible diaphragm

1997-08-27

2000-01-25

Oberleitner, Robert J.

Pipes and tubular conduits

With pressure compensators

Variable capacity chambers

267 6427, F16L 5504

Patent

active

060168412

ABSTRACT:
A gas charged high pressure accumulator includes a hollow housing and a composite flexible diaphragm dividing the interior volume into two leak tight chambers, one of these chambers being adapted to receive hydraulic fluid under pressure and the other chamber containing compressed nitrogen gas. The composite diaphragm is made of only two layers including a first elastic rubber layer facing the fluid chamber and a thin metal layer vapor deposited on the side of the rubber layer facing the gas chamber. The metal deposited film forms a gas impermeable barrier to prevent leakage of the charged gas through the diaphragm into the hydraulic fluid chamber. The surface of the metal film is formed with adjacent scales or plates to enhance the flexibility of the diaphragm, while a continuous metal film is attached underneath to the rubber substrate.

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patent: 5409041 (1995-04-01), Yoshida et al.
patent: 5524671 (1996-06-01), Yoshida et al.

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