Authors : Fedor Vasilyevich Parovay, Valery Alexandrovich Borisov and Elena Fedorovna Parovay
Abstract: For the operation in hostile environments and a wide range of temperature changes (in cryogenic environments) the Samara State Aerospace University developed radial contact seals of reciprocative transportation, including thin-walled open-loop casing made of fluoroplastic-4 over the cross section and an annular elastic element made of the wire material MR. The technique of the contact pressure calculation is presented. This contact pressure is generated by O-ring within its contact with the cylinder surfaces (along the outer diameter) and a rod (along the inner diameter) based on the mechanical characteristic temperature dependency of the applied materials and the thermal deformation of the parts. The calculations are performed to determine the nature of the contact pressure change in the seal when the temperature changes from normal, corresponding to the state of the seal assembly in the assembly, to low, corresponding to the conditions of the seal assembly in cryogenic units. It is shown that the variation nature of the contact pressure depending on the temperature is most strongly influenced by the polymer shell and the distribution of contact pressure across the seal width depends on the rigidity of the shell butts. The recommendations on the selection of the seal design parameters for the designed structure are proposed. These seals are operated within the wide range of temperature change conditions.
Fedor Vasilyevich Parovay, Valery Alexandrovich Borisov and Elena Fedorovna Parovay, 2014. Research of Temperature Influence on the Contact Pressure in Radial Seals. Research Journal of Applied Sciences, 9: 761-766.