Experimental hydraulic friction O-ring

Hydraulic friction characteristics of the O-ring seal is an important issue concerns research. Hydraulic O-ring at different compression ratios suffered friction. Movement, ensure concentricity between the rod and the hydraulic friction O-ring and O-rings between the hydraulic friction lever mounting position leaving a gap in order to avoid friction between the two, four stages were measured hydraulic O-ring of the forces: friction rod starts moving stage, the friction rod uniform motion stage, the friction arm stop motion without unloading the cylinders driving force uninstall the driving force of four stages, and thus can be a detailed analysis of the movement patterns of the entire reciprocation O-ring . Domestic and foreign scholars on the stress distribution of hydraulic installation and use of O-rings in contact failure form had extensive theoretical research, and carried out experimental analysis of hydraulic O-ring friction mechanism under water lubrication conditions and seal pressure, compression experimental study of the amount of friction and slip velocity on the law. The results showed that when a certain low compression ratio of nitrile rubber O-ring hydraulic produce significant force - displacement lag. However, the characteristics of such viscous friction caused by the viscoelastic material, particularly in the variation of friction under dry conditions is unclear. When the low pressure seal, the seal opening force is small, the impact of viscous friction characteristics of hydraulic O-ring seals to dry gas is more prominent. Friction rod begins to move, until it reaches the O-ring hydraulic starting friction (maximum static friction); sliding stage, when the friction rod began to stabilize movement, O-rings in sliding state, the hydraulic friction O-ring and the friction between the bars stabilized; rebound stage, when the friction lever to stop the movement, but the driving force is the same cylinder, hydraulic O-ring friction quickly released, but if it is deformed by squeezing friction release is not complete, the O-ring hydraulic generation hysteresis friction; friction release phase, when the driving force of the cylinder unloading, friction O-ring and the friction between the bar disappears, the frictional force to be released. Sealing pressure and compression of the O-ring hydraulic friction influence law, focused on the hydraulic O-ring when the viscous friction characteristics becomes law, aimed at low-pressure dry gas seal design provides reference.

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