Calculation of sealing force of sealing ring under vacuum

In a vacuum to remove connecting and sealing used in rubber sealing ring are mainly two kinds of cross section shape: round and rectangular and conical, bowl, etc.). The circular cross section of the rubber sealing ring is used very widely. Round section rubber sealing ring and O ring, a sealing ring is the most commonly used. The sealing characteristics is at the same compression ratio, and the rectangular cross-section gasket compared seal width is small, if the seal is the same width as the compression ratio, and can achieve a tapered sealing; shortcomings is O-shaped sealing ring manufacturing is difficult, and seal is easy to produce cavitation.

Application of sealing ring vacuum sealing, mainly by connecting pieces of compression seal ring, so that it can produce elastic deformation to plug or reduce the leakage gap to achieve the purpose of vacuum sealing. Design vacuum seal. Must be the right choice to apply to the rubber ring pressure (called the seal force). The pressure not only with the sealing surface, sealing material composition, hardness and supporting shrinkage ratio, but also like ring compression side is subject to the relevant constraints. It is very difficult to find out the relationship between them in theory. According to the experiment. The different line diameter (rubber ring with circular cross section diameter), different circle diameter (rubber ring diameter) and different hardness of rubber ring, put in the flat flange and sealing between the rectangular habitats in the flange groove compression, side to the experimental data, and then the sealing force is calculated according to the experimental data.

In order to ensure the sealing performance of the high vacuum, the design of the vacuum seal must be properly selected to apply to the unit area of the rubber ring pressure (pressure ratio. The pressure is not only related to the sealing surface condition, the composition of the sealing material, the hardness and the compression ratio, but also the side of the rubber compression. It is more difficult to find out the relationship between them in theory. But according to the real face, the different line diameter (rubber ring with circular cross section diameter] different circle diameter (rubber ring diameter) and different hardness O-ring, put between the flat flange and the flange of the rectangular groove pressure stretched to the need of compression ratio, then, in the worst case, the pressure ratio of about 13kg/cm2.