Accumulator having a safety valve
First Claim
1. An accumulator, comprising:
- a pressure vessel having a liquid introduction port at an end thereof;
a bellows having a first end attached to an inner surface of said pressure vessel so as to separate the interior of said pressure vessel into a liquid chamber communicating with said liquid introduction port and a gas chamber filled with pressurized gas;
a stay member attached to said inner surface of said pressure vessel inside said liquid chamber defining therein a small chamber communicating with said liquid introduction port, said stay member being provided with a communication port for communicating the interior of said small chamber with the remaining part of said liquid chamber and adapted to be closed by a part of said bellows to define a fully contracted state of said bellows; and
a safety valve provided in said stay member for selectively communicating said liquid chamber with said inner small chamber of said stay member, wherein the safety valve opens automatically if the pressure and/or temperature exceeds a prescribed level.
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Accused Products
Abstract
In an accumulator comprising a pressure vessel, a bellows dividing the interior of the pressure vessel into a gas chamber filled with pressurized gas and a liquid chamber which communicates with a liquid pressure circuit via a liquid introduction port, a stay member attached to the inner surface of the pressure vessel inside the bellows and provided with a communication port for communicating the interior and exterior of the stay member with each other and adapted to be closed by a part of the bellows to define a fully contracted state of the bellows, and a safety valve provided in the stay member, typically in the form of a weakened portion of the stay member, for selectively communicating the exterior of the stay member with the interior of the stay member. Thus, because the safety valve is not provided in the pressure vessel itself, the safety valve of the present invention would not affect the sealing capability of the pressure vessel.
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Citations
13 Claims
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1. An accumulator, comprising:
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a pressure vessel having a liquid introduction port at an end thereof;
a bellows having a first end attached to an inner surface of said pressure vessel so as to separate the interior of said pressure vessel into a liquid chamber communicating with said liquid introduction port and a gas chamber filled with pressurized gas;
a stay member attached to said inner surface of said pressure vessel inside said liquid chamber defining therein a small chamber communicating with said liquid introduction port, said stay member being provided with a communication port for communicating the interior of said small chamber with the remaining part of said liquid chamber and adapted to be closed by a part of said bellows to define a fully contracted state of said bellows; and
a safety valve provided in said stay member for selectively communicating said liquid chamber with said inner small chamber of said stay member, wherein the safety valve opens automatically if the pressure and/or temperature exceeds a prescribed level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification