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The performance of hydraulic seals

by:ORK      2022-10-20
The performance of hydraulic seals is as follows: a. The leakage volume is extremely small. The leakage volume of hydraulic seals is extremely small, and it has a good sealing effect, and its sealing effect is automatically improved with the increase of hydraulic oil pressure, even under high pressure and high temperature. In harsh working environments, the leakage of hydraulic seals does not increase significantly. b. Good compatibility Because the hydraulic seal is immersed in hydraulic oil for a long time, it is easy to swell, dissolve or become brittle and hard, so that it loses its sealing effect. Therefore, the hydraulic seal is required to have good compatibility with hydraulic oil. . c. Small frictional resistance In order to avoid or reduce undesirable phenomena such as low-pressure crawling of hydraulic equipment, hydraulic seals are required to have low static frictional resistance and dynamic frictional resistance, and their friction coefficient should be very stable. d. Long service life Hydraulic seals should have good elasticity, heat resistance, cold resistance, pressure resistance, wear resistance and certain physical and mechanical strength, and have a long service life. e. Low price Hydraulic seals should be easy to manufacture and install, and the corresponding sealing grooves are easy to manufacture, and the requirements for the machining accuracy of the sealing surface are low, and the price is low. Structural form and sealing mechanism of hydraulic seals The commonly used self-sealing compression type hydraulic seals are mainly ○-shaped sealing rings, circular sealing rings and square sealing rings, etc. They have the advantages of simple structure, easy manufacture and low cost, so They are dynamic and static sealing elements widely used in hydraulic transmission systems. They are installed in sealing grooves and usually produce 10—25% radial compression deformation, and produce a high initial contact stress on the sealing surface, thereby preventing the leakage of non-pressure liquid. When the hydraulic cylinder is working, the pressure liquid squeezes the self-sealing compression type hydraulic seal to further deform it, and generates a large pressure of the pressure liquid on the sealing surface, strictly speaking, it should be the pressure. The increased and increased additional contact stress, together with the initial contact stress, prevents the leakage of the pressurized liquid. However, when the working pressure is greater than 10Mpa, in order to prevent a part of the synthetic rubber seals self-sealing compression type hydraulic seal from being squeezed into the sealing gap and being cut off during the reciprocating motion of the hydraulic cylinder to cause leakage, it must be A synthetic resin retaining ring, such as a nylon retaining ring, a polyoxymethylene retaining ring and a filled polytetrafluoroethylene retaining ring, is provided on the pressure side of the tight hydraulic seal. Since the synthetic rubber seals self-sealing compression type hydraulic seal has a large compression deformation during operation, its static friction resistance is particularly large, usually more than twice its dynamic friction resistance. Such a large static frictional resistance is bound to cause undesirable phenomena such as low-pressure crawling and difficult operation in some low-pressure hydraulic transmission systems. Classification of hydraulic seals At present, the hydraulic combination seals commonly used in hydraulic cylinders of hydraulic machinery equipment in ceramic factories are mainly composed of ○-shaped seals, square seals, U-shaped seals, Y-shaped seals, YX-shaped seals and other special shapes. The superposition of hydraulic sealing rings is formed. Company website:
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