① Before Operation When the hydraulic pressure is lower than the precharged nitrogen gas ② Energy Storing Up When the hydraulic pressure becomes higher than the precharged ③ Stored Energy Release When the hydraulic pressure drops, the nitrogen gas expands 9〈Inside of Bladder〉Nitrogen Gas 〈Outside of Bladder〉Hydraulic Fluid (oil, water, etc.) ② and ③ are repeatedin the regular cycle.The accumulator is a pressure vessel (container) storing the pressurised hydraulic fluid (oil, water, etc.).Utilizing the compressibility of gas and the incompressible character of hydraulic fluid, the accumulator stores and discharges the fluid following the demand for fluid by the hydraulic system.The accumulator is used for the various purposes in various kinds of industrial machines/facilities. The usage is mainly classified into the following four categories.1. Energy Storage2. Pressure Keeping3. Pulsation Absorption4. Shock DampeningThis is the state just the nitrogen gas has been precharged.pressure, the bladder expands fully in the accumulator body.nitrogen gas pressure, the nitrogen gas is compressed and energy is stored.(The slashed area of right figure shows usable stored oil volume.)and releases the stored energy.Speed Up/ Size Down of Pump / Electric Power SavingLeakage Compensation / Temperature Compensation / Counter BalanceAttenuation of the pressure pulsations created by the hydraulic pump. Elimination of shock wave generated by closing of shutoff valve on hydraulic circuit or from conduct by the actuator.Gas Charging Valve(Charge Nitrogen Gas from this port)BodyBladder(Rubber separator dividing gas and hydraulic fluid ) Oil Port Valve(entrance for hydraulic fluid, anti-extrusion device for bladder)N2GasHydraulic FluidN2 GasN2 GasCompressionCompressionHydraulic FluidN2 GasExpansionHydraulic FluidIntroductionWhat is an accumulator?Function of AccumulatorConstruction of AccumulatorMechanism of Accumulator Operation
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