Bolt-flange coupling structure is the most widely used high-pressure sealing structure
The bolt-flange joint structure is currently the most widely used high pressure seal structure. The research on bolt-flange joint structure mainly focuses on the following aspects: development of new gaskets and improvement of sealing performance of traditional gaskets; development of new sealing structures; research and improvement of traditional sealing structures. In order to meet the needs of the development of high pressure vessels, various high pressure sealing structures have been invented so far, such as flat gasket seals, double cone seals, kardary seals, Wood seals, and the like.
The D-bolt is connected with a high-pressure sealing structure, and the D-bolt high-pressure sealing structure places the top cover inside the end flange and is coupled by a D-shaped axial shear bolt. (a) is to fix the D-bolt to the top cover, and (b) to fix the D-bolt to the end flange. The D-bolt structure is shown in Fig. 2, and the axial side is flattened by about 1/4 turn. Comparison with several common sealing structures The D-bolt high-pressure seal is compared with the commonly used double-cone seal and the Kazar-in seal from the aspects of structure, processing, sealing reliability and quality.
The structural double cone seal is a semi-self-tightening seal. The top cover is fixed to the end flange by large bolts, and the large bolts are subjected to the axial chemical equipment and the pipe clamped sealing structure force caused by the internal pressure, and provide the pre-tightening force required for the sealing element to form the initial seal. There is a gap between the double cone ring and the top cover, and the bracket is used to lift the double cone ring. The main problem of the double cone sealing structure is that as the pressure of the container increases and the inner diameter increases, the diameter of the large bolt increases, and the assembly and disassembly becomes difficult. In particular, the flange and the top cover are large in size, so that the large forging is supplied, heat treated, There are many problems in processing and on-site installation.
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