The Effect Of Friction On O-rings

O-rings are used in various pipelines, and friction will inevitably occur during transportation. How will friction affect the O-rings?

In sealing arrangements, friction can damage the worn O-rings and affect the sealing. The degree of wear mainly depends on the size of the static friction. When the liquid pressure is small, the friction size of the O-ring depends on its compression shrinkage. When the working fluid is under pressure, as the pressure of the delivery line increases, the frictional force increases. In the case of working pressure less than 20MPa, approximate linear relationship. When the pressure is greater than 20MPa, the pressure effect, the increase of the contact area between the O-ring and the metal gradually slows down, and the friction force will increase accordingly.

Under normal circumstances, the service life of O-rings is tight with the increase of hydraulic pressure, and the pressure of the conveying pipeline is strictly controlled. The increase in friction during installation results in high frictional heat between the installation rotation and the O-ring. Since most O-rings are made of rubber material, they have extremely poor thermal conductivity. Therefore, frictional heat can cause aging of the rubber, resulting in loss of the O-ring seal. Friction can also cause damage to the O-ring surface, reducing the amount of compression. Severe friction can damage the surface of the O-ring, and the loss of the seal can affect the safety of the pipeline. So friction can seriously affect the O-ring seal.

O-rings are suitable for all kinds of mechanical equipment, in the specified temperature, pressure and different liquid and gas medium, the sealing effect in static or moving state. In machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, construction machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery and other instruments, a large number of various types of seal components are used . O-rings are mainly used for static and reciprocating seals. For rotary motion seals, only low speed rotary seals are available. O-rings are usually installed on seals of rectangular cross-section on the outer or inner ring. O-rings still play a good role in sealing and shock absorption in environments such as oil, acid, grinding, and chemical erosion. Therefore, O-rings are used in the most widely sealed hydraulic and pneumatic transmission systems.

The O-ring has its own sealing function and does not need to be adjusted periodically. When used for sliding sealing, the sealing performance can not be affected by the direction of movement. It is small in size and easy to use. Because of the large adaptability of the sealing ring, the application of The range is very wide, but it is easy to deform when the pressure peak reaches a certain pressure, and it is possible to squeeze out the gap. It is widely used in aviation and hydraulic engineering.