JP2009092142A5 - - Google Patents

Claims (2)

An accumulator housing;
An oil port provided in the housing and provided with a port hole connected to the pressure pipe;
A bellows disposed inside the housing and having a fixed end fixed to the oil port;
A bellows cap fixed to the free end of the bellows;
A gas chamber provided on the outer peripheral side of the bellows and enclosing a high-pressure gas;
A liquid chamber provided on the inner peripheral side of the bellows and communicating with the port hole;
A movable plate supported on the oil port side of the bellows cap via a rubber elastic packing;
A seal that is provided on the bellows cap side inner surface of the oil port and that the movable plate comes into contact with and detachable from,
When the liquid chamber is discharged from the port hole and the movable plate comes into contact with the seal, the liquid chamber is closed and a part of the liquid is confined in the liquid chamber. And a communication path that communicates the space between the bellows cap and the movable plate;
A through hole provided in the movable plate as a part of the communication path;
Have
During steady operation, the movable plate moves with the bellows cap while being supported by the packing,
When the zero-down, the movable plate is in contact with the seal by moving together with the bellows cap,
In the thermal expansion of the liquid and the sealed gas, the movable plate is kept in contact with the seal and the bellows cap moves while compressing the packing to a position where the liquid pressure and the gas pressure are balanced. The accumulator according to claim 1, wherein
An accumulator comprising a three-dimensional structure that acts as a spacer on one or both of a bellows cap and a movable plate.