Study On The Dynamic Auxiliary Seal Ring Of Dry Gas Seal

There are two types of auxiliary seal ring used in Dry Gas Seal(DGS) equipment.one is elastomer seal ring(o-ring ,rectangle-ring),the other is lip elastomer seal ring(v-ring).it is usually called dynamic auxiliary seal ring which slids along the axial direction.In this paper, finite element method and MSC.Marc soft ware was used to build the model of dynamic seal ring. The equivalent cauchy stress, friction stress and deformation of seal ring were calculated .The mainly tasks are as follows:Firstly, the model of dynamic auxiliary seal ring was built by MSC.Marc software. The program was worked out to calculate the cauchy stress and friction stress under different working condition and different parameters .The initial compress ratio which affects the seal performance was also analyzed. The cauchy stress and friction stress of different sorts of rubber material were contrast. The limitation of cutting destruction for O ring was calculated. The phenomenon of Seal ring extruded out of groove caused by high pressure was analyzed. The Cauchy stress and friction stress of seal ring with single side block ring and double side block ring were analyzed. Secondly, experiment of permanent deformation and stress slack were carried out to study the reason why the seal ring lapse. The reason why seal ring cracked and how to deal with it were all discussed.Thirdly, the equivalent stress and friction stress of PTFE v-ring and spiral spring supported U-ring were calculated. The different layer of V-ring seal were studied to make contrast. The consolidate effect of spiral spring supported U-ring was also discussed.Fourthly, the axial movement regulation of auxiliary seal ring was analyzed when there was tiny angle between the axial direction of seal face and principal axis. The jiggle movement equation and axial damp coefficient were all studied.