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13

2022

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12

The role of the piston rod seal

The piston rod seal is one of the main pressure-bearing components in the hydraulic cylinder. It is one-way pressure-bearing, bears a large pressure, and is in direct contact with the hydraulic oil. The piston rod seal is installed inside the dust-proof seal of the hydraulic cylinder end cover to prevent the leakage of hydraulic oil.


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  Piston rod sealIt is one of the main pressure-bearing components in the hydraulic cylinder. It is one-way pressure-bearing, bears large pressure, and is in direct contact with hydraulic oil. The piston rod seal is installed inside the dust-proof seal of the hydraulic cylinder end cover to prevent the leakage of hydraulic oil.

The structure of the piston rod seal and the seal ring is the key component of the reciprocating actuator. It is not only related to the leakage problem, but also affects the performance and life of the entire mechanical equipment. In reciprocating actuators. At this time, the product mainly bears a certain axial force and reciprocates at a certain speed to do work externally. With the development of science and technology and industry, the requirements for reciprocating motion are getting higher and higher, especially in the case of high-pressure and high-speed motion, the sealing structure and sealing ring of the piston rod are particularly important. When you use it, you should know that O-shaped, narrow cross-section Y-shaped sealing rings and V-shaped sealing rings were used before. Due to the dry friction between them, the friction resistance is large, which often leads to premature wear of the sealing lip. In the past, the piston rod seal mainly used O-ring, narrow section Y-ring and V-ring. Of course, there are also knowledge points. Because some commonly used rod sealing structures and sealing rings allow relatively low movement speed, they are widely used in occasions where the movement speed is not high, such as construction machinery, metallurgical equipment, light industry and agricultural machinery.

When the piston rod is sealed, it mainly refers to the foreign application experience, and adopts the first-level seal and a Y-ring to seal the piston rod. The step seal is single acting and has sealing characteristics similar to a gray ring. By its nature, it is very good for preventing dust from entering, protecting equipment and maintaining sealing performance. The secondary function of the piston rod seal is to prevent scratching. The movement of the piston rod in the guide sleeve requires a certain amount of oil film for lubrication. These oil films can accumulate into droplets under the action of the outer lip of the dust ring, causing leakage. Therefore, the inner lip of the dust ring must have a scraping effect to remove the oil film between the dust ring and the main seal, so that the oil film not only plays a lubricating role but also does not leak. Type A dust ring shall be used as required. The piston rod seal is made of nitrile rubber and has a comb-shaped cross-section sealing surface on the outside to ensure its reliable positioning in the groove.


Key words:

Piston rod seal