The piston rod sealing structure and sealing ring are key components in the reciprocating actuator. It is not only related to leakage problems, but also affects the performance and life of the entire machine and equipment. In the reciprocating actuator, the piston rod mainly bears a certain axial force and reciprocates at a certain speed to perform external work. With the development of science, technology and industry, the requirements for reciprocating motion are getting higher and higher. Especially in the case of high pressure and high speed movement, the issue of sealing structure and sealing ring for piston rod is particularly important.
In the past, O-shaped sealing rings, narrow-section Y-shaped sealing rings and V-shaped sealing rings were mostly used for sealing the piston rod. These sealing types often cause premature wear of the sealing lip due to dry friction between the piston rod and the seal, resulting in large friction resistance. In the past, O-shaped sealing rings, narrow-section Y-shaped sealing rings and V-shaped sealing rings were mostly used for sealing the piston rod. Commonly used rod sealing structures and sealing rings have relatively low allowable movement speeds, so they are widely used in situations where movement speed is not required, such as hydraulic equipment in engineering machinery, metallurgical equipment, and light industry and agricultural machinery.
Combined sealing rings, such as K-type special seals, are composed of two different components: one is a stepped sealing ring (main seal) made of polytetrafluoroethylene and bronze filler, and the other One is the O-ring seal (elastic element and secondary sealing function). The combined sealing ring (K-type special seal) has the characteristics of low friction resistance, no crawling when starting, extremely low leakage and anti-wear. The combined application of sealing rings avoids contact between metals, improves the support capacity and withstands a certain lateral force, has small friction, and is suitable for high-pressure and high-speed systems, which has been confirmed by tests.