In order to reduce Design of hydraulic station The failure rate of oil cylinder needs to know several states of hydraulic seal. When the seal is not installed, there are four dimensions: the inner diameter of the sealing root, the outer diameter of the root, the inner diameter of the nozzle and the outer diameter of the nozzle. When the seal is installed in the groove, the seal size is constant and the size of the seal is completely variable. The four dimensions are the outer diameter of the sealing root, the outer lip diameter is the outer diameter of the groove, the diameter of the inner lip is the diameter of the piston rod, the gap between the seal and the piston rod and the diameter of the piston rod.
When Hydraulic station When the oil cylinder starts to work, the working state of the seal is as follows: the inner and outer lips are close to the inner and outer walls, and slowly retreat. The root of the seal is pressed back. With the increase of pressure, the force of hydraulic oil on the seal increases, and the overall deformation of the seal also increases. When the pressure of the cylinder does not return to the original working state. Repeated deformation, repeated recovery, until the effective amount of lip seal completely lost, seal damage.
Secondly, the dimensional tolerance of the hydraulic cylinder groove must be matched with the seal. There are many types of reciprocating seals, such as L-shaped, U-shaped, V-shaped and Y-shaped, most of which are lip seals. Reciprocating lip seals are widely used in Hydraulic system In the reciprocating oil cylinder.
The pressure surface of the seal is lip shaped, and there is a small interference during installation, so that the lip shape fully contacts with the sealing surface, resulting in sealing effect. When the cylinder works, the contact force and contact area increase with the increase of pressure, and the sealing performance increases with the increase of pressure. When the cylinder returns, the pressure decreases, the contact area and force decrease, and the sealing performance decreases.