Rubber O-rings and use of the structural characteristics of

Damage common general rubber O-ring: First hardening (aging). Wherein the rubber O-ring leak reason is due to the material itself is affected curing temperature, when the hardness is too high, the rubber O-ring can not fill the gap between the mating parts, will produce leakage; second is worn. Wear rubber O-ring involves mating parts of the surface finish, the movement speed and transmission media, different sealing materials to adapt to different velocities; Third Extrusion: When the rubber O-ring to put too much pressure will be extruded metal gap, seal damage and leakage, this case relates to the rubber O-ring itself and the metal hardness gap is too large, if the design, selection, processing, improper handling or installation, there will be extrusion damage; Fourth corrosion. Demonstrated by the case of the sealing member to soften or even dissolve, because the rubber O-ring media intrusion. An error occurred while the selection of materials. If you have to pay special attention to the media or aqueous solvent.

The leak is one of failure of mechanical equipment often produced. The main cause of the leakage has two aspects: First, as a result of machining, surface mechanical products, there must be a variety of shapes and sizes of defects and deviations, so the mechanical parts of the coupling will inevitably produce a gap; the second is sealed on both sides pressure difference exists, the working medium will leak through the gap. Reduce or eliminate the gap is the main way to prevent leakage. Vacuum sealing system, in addition to direct media leaks by sealing the sealing surface, but also consider the following two forms of leakage: leakage. That is under pressure difference, medium to be sealed by a rubber O-ring material called capillary leak leak; diffusion. That difference in the concentration effect, medium to be sealed or capillary seal gap sealing material produced by diffusion mass transfer becomes. The sealing function is to seal the gap between the joints, isolated or cut off leakage channel, increase channel leakage resistance, or increase in the channel set small acting element, to spill caused by pressure, differential pressure and cause leaks partially offset or perfectly balanced to prevent leakage.

Rubber O-ring seal, in addition to the structural design is reasonable sealing device performance and manufacturing quality seal sealing material related, but also with the method of assembling the seal assembly and reasonable sex. Sealing effect of the merits of reliable working machine hydraulic system plays an important role, with the correct assembly method for assembly of hydraulic equipment, seals easily damaged, good elasticity, long service life, improve the quality and performance of seal products .

All hydraulic cylinders must be installed dust ring. When the piston rod return, dust ring will stick to scrape dirt on its surface to protect the seals and the guide sleeve from damage. Double acting scraper seal both auxiliary function, which is scraped off the inside of the lips on the film adhered to the surface of the piston rod, thereby improving the sealing effect. Dust seal to protect the critical components of hydraulic equipment is extremely important. Penetrate the dust, not only seal wear, and may significantly wear the guide sleeve and the piston rod, impurities into the hydraulic medium, will also affect the operation of the valve and pump function, also may damage these devices. Wiper can get rid of the dust on the surface of the piston rod, but do not damage the oil film on the piston rod, which is also beneficial to lubricate the seal. Dust seal in the design, not only to adapt to the piston rod seal must also play a role in the groove.

Dynamic features: an effective dust seal, its lip with respect to the contact force of the piston rod must be sufficiently large. Elastic material of relatively high hardness most vulnerable to this effect. Hardness up to 94 ° polyamine vinegar is especially suitable for the dust seal material. Its features include high modulus (stiffness), excellent wear resistance and low compressibility. This material can be applied from -40 ° to 100 ° temperature range of most applications.

Static features: Designed for enclosed mounting groove without enhanced single-acting wiper seal is difficult to play an effective role in the seal groove. This is because such a dust seal in the trench is a loose fit installation. Only in contact with the piston rod seal lip dust seal sealing force is provided with the cylindrical surface. When the temperature is lowered, the entire dust ring contraction, the risk of leakage between the outer diameter of the trench will appear. To obtain satisfactory results, the situation is bound to compensate the dust seal design.