Accumulator has many functions,it can be divided into four categories: storing energy, recovering energy, reducing noise and absorb hydraulic shock.
Class I: stored energy
① As an auxiliary power source to reduce the installed capacity;
② Compensate for leakage;
③ Thermal expansion compensation;
④ As emergency power source;
⑤ Constitute a constant pressure oil source.
Category II: energy recovery
Energy recovery with accumulator is a research field at present. Energy recovery can improve energy utilization . Because the accumulator can temporarily store energy, so it can recover a variety of functional and positional potential energy.
Class III: reduce noise
The sudden reversing of directional valve and the sudden stop of actuator movement will produce pressure impact in the hydraulic system, make the system pressure rise rapidly in a short time, cause damage to instruments, components and sealing devices, and produce vibration and noise.
Category IV: absorb hydraulic shock
For the hydraulic system with plunger pump and less plunger, the periodic change of pump flow makes the system vibrate. An accumulator can absorb a large amount of energy in fluctuating pressure and flow.
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