D-bolt C-ring high-pressure sealing structure shows D-bolt O-ring high-pressure sealing structure Schematic processing Double cone sealing structure is simple, the main machining methods are vertical car, drilling, tapping, easy to manufacture, processing accuracy is not too high . The threaded sleeve and the top cover of the externally threaded plug are required to have high precision in the process of interrupting the thread. The large-sized insert is required, and the large-diameter sawtooth thread is difficult to process, especially after the cylinder thread is damaged. When processing the D-bolt seal structure, it is only necessary to position the screw holes of the top cover and the end of the cylinder at one time to complete the drilling and tapping; the D-bolt is also simple to manufacture; the machining accuracy of the C-ring or O-ring The requirements are higher.

Sealing reliability utilizes internal pressure to create a self-tightening action, which is a simple and effective way to improve the sealing effect. For the double-cone structure, the cylindrical surface of the top cover is milled with a longitudinal groove. When pre-tightening, the top bolt is pressed by the main bolt to press the double cone ring, and the inner side surface is tightly attached to the top cover to establish an initial seal; during operation, the medium pressure enters the gap between the double cone ring and the top cover, so that the double cone ring Radial expansion, thus playing a radial self-tightening effect. Once the structure leaks during operation, tightening the bolts is useless.

For the Kazari seal, after tightening the pre-tightening bolt, the pressure ring presses the gasket to make it close to the top cover and the end of the cylinder and establish an initial seal; during the operation, if the pre-tightening bolt is loose or leaking , you can continue to tighten the pre-tightening bolts, so the seal is reliable.

The D-bolt high-pressure sealing structure adopts elastic wire contact sealing gasket (such as C-ring, etc.), and the initial sealing is realized by pre-tightening screws, and the pre-tightening degree is separately adjustable. The high-pressure container with the inner diameter Di=500mm, the design pressure p=15MPa, and the 16Mn forging material is taken as an example, and the structural dimensions and quality of several sealing structures are compared.

Conclusion In summary, the D-bolt high-pressure sealing structure has the following basic features: (1) It is convenient to assemble and disassemble the D-shaped bolt by 90e angle with ordinary tools, so that the top cover and the end of the cylinder can be quickly assembled and disassembled. (2) The structure quality is light. Because the top cover is placed in the end of the cylinder, the quality of the top cover can be greatly reduced. The total mass of the structure can be reduced by 46.2% compared with the commonly used double cone sealing structure, and 54.6% less than the Kazari sealing structure. The larger the diameter of the container, the more significant the effect will be. (3) The seal is reliable, and the C-ring and other seals can be used for the line contact self-tightening seal. The pre-tightening degree of the seal can be adjusted by pre-tightening the screw, and the self-tightening effect is obvious after the internal pressure is raised.

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