Prestressed hydraulic accumulator
First Claim
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1. An oleopneumatic accumlator comprising:
- a first shell having an open end forming a first chamber adapted to receive pressurized gas, and a second shell having an open end forming a second chamber adapted to receive a pressurized hydraulic fluid, a flexible membrane disposed at the open ends of said first and second chamber and forming fluid tight seals therewith;
an elastic metal annular clamping band which is pretensioned along a longitudinal axis prependicular to a diameter of the band by a predetermined amount corresponding to a hydraulic pressure applied to said second chamber at which said first and second shells separate, said band being stretchable primarily in the direction of the pretensioning along said longitudinal axis, said band diameter being oriented parrallel to said open ends;
means for affixing said clamping band to said first and second shells to overlie the edges of said open ends thereof while still retaining at least a portion of said pretension to clamp the shells together; and
whereby said shells separate when hydraulic fluid pressure in excess of said predetermined amount of tension is applied to said second chamber.
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Abstract
A hydraulic accumulator comprises two-half shells, the diaphragm therebetween defining two cavities. One cavity contains pressurized gas and the cavity receives hydraulic fluid under pressure. The two-half shells are held together by a mechanical element, such as a belt which has been previously prestressed to a tension selected according to the maximum pressure to which the accumulator will be subjected. The use of the prestressed mechanical element changes the dynamic stresses ordinarily found in a hydraulic accumulator to static stresses, thus minimizing the occurrence of creeks and failure of the device.
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Citations
14 Claims
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1. An oleopneumatic accumlator comprising:
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a first shell having an open end forming a first chamber adapted to receive pressurized gas, and a second shell having an open end forming a second chamber adapted to receive a pressurized hydraulic fluid, a flexible membrane disposed at the open ends of said first and second chamber and forming fluid tight seals therewith; an elastic metal annular clamping band which is pretensioned along a longitudinal axis prependicular to a diameter of the band by a predetermined amount corresponding to a hydraulic pressure applied to said second chamber at which said first and second shells separate, said band being stretchable primarily in the direction of the pretensioning along said longitudinal axis, said band diameter being oriented parrallel to said open ends; means for affixing said clamping band to said first and second shells to overlie the edges of said open ends thereof while still retaining at least a portion of said pretension to clamp the shells together; and whereby said shells separate when hydraulic fluid pressure in excess of said predetermined amount of tension is applied to said second chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An oleopneumatic accumulator comprising a first shell having an open end forming a chamber adapted to receive pressurized gas and a second shell having an open end forming a second chamber adapted to receive a pressurized hydrualic fluid, a flexible membrane disposed at the open ends of said first and second chambers and forming fluid tight seals therewith and an elastic metal clamping band stretchable primarily in a direction parrallel to a longitudinal axis perpendicular to a diameter of said band, said diameter being oriented parrallel to said open ends, said accumulator being produced by the process comprising the steps of:
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engaging opposite ends of said elastic clamping band to tension said band in said direction along the longitudinal axis perpendicular to a diameter of said band, said tension being in a predetermined amount corresponding to a hydrualic pressure applied to said second chamber at which said first and second shells separate; affixing said elastic clamping band to said first and second shells to overlie the edges of said open ends; and disengaging said opposite ends of said affixed clamping band, said affixed clamping band retaining at least a portion of said tension to clamp the shells together, whereby said shells separate when hydraulic fluid pressure in excess of said predetermined amount of tension is applied to said second chamber. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification