Advantages and working principle of piston accumulator

A piston accumulator uses a floating piston with a sealing element to separate gas and oil, which can adapt to special hydraulic oil.

Its advantages are: simple structure, large effective volume, and long service life. The pressure can be very high. Although domestic piston type accumulators (3 times or less safety factor) can only achieve 21Mpa or 31.5Mpa, the conventional piston type accumulator (4 times safety factor) can achieve 138Mpa (1380 Bar), while unconventional models can achieve higher pressure; The high-temperature resistant model has more stable performance, and the Tuoba high-temperature resistant model piston energy accumulator can withstand high temperatures below 230 degrees Celsius; It can withstand large pressure fluctuations and is suitable for connecting gas cylinders or cylinder groups in series (greatly improving volume utilization). Usually, the service life is longer than that of a leather bag accumulator; Compared to the replacement of leather bags, the piston type replacement of seals has a lower cost and easier operation; Easy installation, simple structure, convenient maintenance, and easy inflation; Unlike the sudden failure of a leather bag (which leaks due to the rupture of the leather bag), the piston type generally has multiple seals, and even if the failure occurs, it gradually and slowly fails (leaks). For certain equipment or systems, the sudden failure of the accumulator may lead to accidents or significant losses. In this case, a piston type accumulator should be chosen; The piston type accumulator can be made very large, and the conventional model of the Tuoba piston type accumulator can have a single volume of 760 liters, while the unconventional model can be even larger; Due to the fact that gas and oil are divided into two chambers due to the piston, it is easy to measure and install sensors to determine the position of the piston and detect the position of the oil.

The working principle of a piston accumulator is the Pascal principle, which requires one end to store gas and the other end to be the hydraulic system pressure. The hydraulic pressure pushes the piston to compress gas, and the pressure energy of the liquid is stored in the gas. When the hydraulic pressure drops, the pressure of the accumulator gas pushes the piston to release energy until it is the same as the system pressure or moves to a large stroke.