What are the common sealing forms of hydraulic cylinders?
Usually sealed rubber ring for sealing, and very few occasions, piston and cylinder will also be sealed with piston rings. There are many kinds of sealing rings, each of which has its own advantages. Some are simple, such as: O aprons. But the service life is short. Some are suitable for high voltage and high speed: so special.
The common sealing forms include clearance seal, friction ring seal and sealing ring seal. 1, the gap seal to rely on the relative movement of the small gap between the surface to prevent leakage. In order to improve the sealing capacity of the device, several small annular grooves are often made on the surface of the piston to increase the resistance of the oil through clearance. It has the advantages of simple structure, small frictional resistance, resistant to high temperature, but the leakage of large, high processing requirements, can not restore the original capacity after abrasion is only used in small size, low pressure, high speed of relative movement between the cylinder and the piston.
2, the friction ring seal on sleeve friction on the piston ring (made of nylon or other polymer materials) in O sealing effect of elastic ring under tight and cylinder wall to prevent leakage. This material is good effect, friction is low and stable, high temperature resistant, wear compensation ability, but the processing requirements, installation is inconvenient, suitable for high voltage and high speed or high sealing performance requirements. 3, the sealing ring sealing is to use rubber or plastic elasticity, so that a variety of sections of the ring ring attached to the static and dynamic between the mating surface to prevent leakage. The commonly used sealing rings are O, Y, V and so on. The utility model has the advantages of simple structure, convenient manufacture, automatic compensation after wearing, reliable performance, and can be used between the cylinder and the piston, between the cylinder head and the piston rod, between the piston and the piston rod, between the cylinder and the cylinder head.
