Commonly used self-sealing compression 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 widely used in hydraulic transmission systems. Dynamic seal elements and static seal elements. They are installed in the sealing groove and usually produce 10-25% radial compression deformation, and generate high initial contact stress on the sealing surface, thereby preventing the leakage of unpressurized liquid. When the hydraulic cylinder is working, the pressure liquid squeezes the self-sealing compact hydraulic seal to further deform it, and generates a large pressure of the pressure liquid on the sealing surface, strictly speaking, it should be pressure. Increased and increased additional contact stress, together with the initial contact stress to prevent the leakage of pressure liquid. However, when the working pressure is greater than 10Mpa, in order to prevent a part of the synthetic rubber self-sealing compression hydraulic seal from being squeezed into the sealing gap and being cut off during the reciprocating movement of the hydraulic cylinder to cause leakage, the synthetic rubber self-sealing hydraulic seal must be sealed. The pressurized side of the tight hydraulic seal is provided with a synthetic resin retaining ring, such as nylon retaining ring, polyoxymethylene retaining ring and filled polytetrafluoroethylene retaining ring. Since the synthetic rubber self-sealing compression 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 adverse phenomena such as low-pressure crawling and difficult operation in some low-pressure hydraulic transmission systems, which is why the self-sealing compression hydraulic seal is very small and used alone as a dynamic seal. picture lip seal At present, the hydraulic combination seals commonly used in hydraulic machinery equipment hydraulic cylinders in ceramic factories are mainly composed of ○-shaped seal rings and square seal rings, U-shaped seal rings, Y-shaped seal rings, YX-shaped seal rings and other special-shaped hydraulic seal rings. composed of superimposed V-shaped sealing ring The sealing performance of the V-shaped sealing ring is better, and the number of sealing rings used can be determined according to the size of the working pressure. Usually, the wear of the sealing ring must be compensated by the adjustment of the gland. Its fatal weakness is the complex structure, which usually requires It consists of three parts: support ring, sealing ring and pressure ring. Its frictional resistance is relatively large and increases with the increase of working pressure and the number of sealing rings. Therefore, the V-shaped sealing ring is only suitable for hydraulic cylinders with low moving speed and high working pressure. U-shaped sealing ring The U-shaped sealing ring has good sealing performance, but it is easy to roll over when used alone, so it needs to be used in conjunction with the tin bronze support ring. Its frictional resistance is relatively large and increases with the increase of the working pressure. Therefore, the U-shaped sealing ring is only suitable for hydraulic cylinders with low working pressure or low moving speed. Y-shaped sealing ring The Y-shaped sealing ring is kept sealed by its open lip close to the sealing surface. It can usually be used alone. It has good sealing performance, small frictional resistance, good pressure resistance, good working stability and long service life. long. Therefore, the Y-shaped sealing ring is suitable for hydraulic cylinders with high-speed variable pressure, large bore and large stroke. YX-shaped sealing ring The YX-shaped sealing ring is a Y-shaped sealing ring whose section height to width ratio is greater than 2 and the working lip is not equal to the non-working lip. It is divided into a YX-shaped sealing ring for holes and a YX-shaped sealing ring for shafts. , In addition to all the advantages of Y-shaped seals, YX-shaped seals will never roll over when used alone, further improving its pressure resistance and working stability. Therefore, the YX-shaped sealing ring is especially suitable for hydraulic cylinders with high pressure, high speed variable pressure and fast movement. Self-sealing tight hydraulic seals: Lip seals, like self-sealing compression hydraulic seals, generate high initial contact stress on the sealing surface according to their own deformation, preventing the leakage of unpressurized liquid. When the hydraulic cylinder is working, the pressure liquid squeezes and stretches its sealing lip so that it clings to the sealing surface to generate a higher additional contact stress that increases with the pressure of the pressure liquid, and together with the initial contact stress prevent the pressure Liquid leakage. Combination seals Commonly used combined seals for hydraulic cylinders are mainly bud rings, grid rings and step seals. 1: bud ring The bud ring is usually composed of a synthetic rubber ○-shaped sealing ring and a cloth rubber Y-shaped sealing ring. Like seals, according to its own deformation, a higher initial contact stress is generated on the sealing surface to prevent the leakage of unpressurized liquid. When the hydraulic cylinder is working, the pressure liquid always squeezes and stretches the sealing lip of the Y-shaped seal ring through the elastic deformation of the ○-shaped seal ring, so that it is close to the sealing surface and produces a higher pressure that increases with the pressure of the pressure liquid. The additional contact stress, together with the initial contact stress, prevents the leakage of pressurized fluid. 2: Gelai circle The grid ring is usually composed of a synthetic rubber ○-shaped seal ring and a square seal ring filled with polytetrafluoroethylene. It can be divided into a hole grid ring and a shaft grid ring, but its sealing The effect is the same, according to its own deformation, a higher initial contact stress is generated on the sealing surface to prevent the leakage of unpressurized liquid. When the hydraulic cylinder is working, the pressure liquid squeezes the square seal ring to the maximum extent through the elastic deformation of the ○-shaped seal ring, making it close to the sealing surface to generate a higher additional contact stress that increases with the pressure of the pressure liquid, and Together with the initial contact stress, it prevents the leakage of pressurized fluid. 3: Stefan Steering seals are usually composed of synthetic rubber ○-shaped sealing rings and special-shaped rectangular-trapezoidal sealing rings filled with polytetrafluoroethylene. Like Gelai rings, they can be divided into hole-used Steering seals and shaft seals. With Ster seal, its sealing effect and sealing mechanism are the same as that of Glyph ring, but it only has one-way sealing effect. Self-sealing compact hydraulic sealing ring: lip-shaped sealing ring, the contact area of the lip that closely fits the sealing surface is small, which can produce greater compression deformation and obtain better sealing effect. But it is easy to wear, and its sealing effect will be significantly reduced after wear. If the ○-shaped sealing ring is used in combination with it, that is, when the seal is combined, even after the lip is worn, the synthetic rubber ○-shaped sealing ring has greater elasticity. It will force the lip of the lip seal ring to cling to the sealing surface, generate enough surface contact stress to achieve the sealing effect, and the friction resistance is small, the work is stable, and it is easy to assemble and maintain. Therefore, at present, the hydraulic seals widely used in automatic hydraulic brick presses, daily-use ceramic products, disc and dish isostatic pressing machines, and medium-pressure grouting and high-pressure grouting sanitary ceramic molding machines are almost all combined seals. Such as Gelai circle and Sterling circle and so on.

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