What causes leakage in the accumulator

When the accumulator is working, the speed of the piston generally reaches (2~3)m /s, which has high requirements on the performance of the seal and the dimension machining precision and surface roughness of the cylinder bore.

 

The piston seal structure of the original piston accumulator adopts a yx seal ring at both ends and an o ring with double baffle ring in the middle. Although the performance of the yx sealing ring and o-ring is good, due to the limitations of the structure and materials of the sealing parts, the suitable reciprocating motion speed is no more than 0.5m /s.

 

Ld10 piston (material) and cylinder contact directly, by nitrogen gas cavity side a yx seals remain the state of dry friction or half dry friction, the friction resistance increases, the action of piston accumulator sensitivity, in this case the piston speed will generate heat, make the seal appear aging phenomenon, affect the sealing performance of seal, shorten the service life of the seal, which verified the seals appear black, harden, some phenomena of the brittle, seal lost sealing function, internal leakage also occurs naturally.

 

In addition, the dimension accuracy and surface roughness of the inner surface of the cylinder; Dimension accuracy and surface roughness of piston seal groove machining; The protection of seals and the cleanliness of hydraulic oil used during installation will affect the internal leakage.

The above: Gas charging method of accumulator gas charging tool