Compression rate and tensile amount of rubber seals
O-ring The selection of compression coefficient W of plastic O-ring should take into account the application standard, packing seal or dynamic seal; packing seal can be divided into tangential sealing and radial sealing; tangential sealing The leakage gap of sealing (or cylindrical packing seal) is axial gap, and the leakage gap of radial tightness (or horizontal packing seal) is radial gap. According to the diameter or diameter of the pressure material acting on the O-ring, the radial tightness is divided into two conditions: gas pressure and pressure, the tension of the gas pressure increase, and the initial tension of the O-ring when the pressure is lowered. The above-mentioned different ways of packing and sealing, the effect of the sealing material on the O-ring is different, so the pre-pressure design scheme is also different. For dynamic sealing, it is necessary to distinguish between repeated movement sealing or rotating fitness movement sealing. 1. Packing seal: The cylindrical packing and sealing equipment is the same as the repeated motion sealing equipment, generally W=10%～15%; the plan view packing and sealing equipment is W=15%～30%. 2. In terms of dynamic sealing, it can be divided into three conditions; repeated movement generally takes W=10% to 15%. The Joule thermoelectric effect needs to be taken into account when selecting the compression factor for the tightness of the rotating fitness exercise. Generally speaking, the nominal diameter of the O-ring used for the rotating fitness exercise is 3%-5% larger than that of the journal, and the compression coefficient of the diameter is W=3 %-8%. O-rings for low-friction fitness sports generally choose a smaller compression coefficient in order to better reduce friction, that is, W=5%-8%. In addition, it is necessary to fully consider the plastic caused by material and temperature. Material swells. Usually, outside the known shrinkage deformation, the allowable maximum expansion coefficient is 15%. Exceeding this range indicates that the selection of raw materials is not suitable. It should be changed to an O-ring of other materials, or the known shrinkage deformation rate should be adjusted. . Plastic O ring manufactures generally have a certain amount of stretching after they are placed in the sealed pipe groove. Like the compressibility factor, the level of tension has a greater impact on the sealing characteristics and service life of the O-ring. The large amount of drawing will not only make the assembly of the O-ring difficult, but also reduce the compression coefficient due to the change of the cross-sectional aperture d0, which may even cause leakage.
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