Sealing Structure Research And Stess Analysis Of Deepwater Collet Connector

In the deepwater engineering equipment,deepwater connector is an important equipment used for the connection between the oil and gas pipelines,the study of underwater connector is the key points and difficulties of the marine resource exploitation and research.Collet connector with high reliability,high installation efficiency,self-locking and other characteristics,it's application is extensive,but little research has been done on it.In this paper,the performance of a new sealing scheme was analyzed,and the performance of the connector was discussed from the aspects of force characteristics,temperature field and stress distribution of the coupling field.This paper put forward a compound sealing scheme combining metal seal and rubber seal from the typical structure and work flow of the collet connector;Based on the Hertz contact theory,a contact calculation model of metal inner seal was established;Combined with the mechanical model of preload condition and working condition,the key factors such as axial preload force,seal contact width and contact pressure which influence the metal seal performance were obtained;Through calculation and analysis of the finite element model,concluded the sealing contact pressure and the stress variation characteristics of the sealing core parts under preload condition and working condition.The Mooney-Rivlin model of two-parameter rubber material was used to describe the non-compressible hyperelastic properties of the rubber seal,the model parameters of the rubber with different hardness are solved;the mechanical behavior and the sealing contact pressure during the deformation process of the standard rubber seal were analyzed by using finite element analysis,the effects of the rubber compression rate,rubber hardness and the presence of the retaining seal on the sealing performance were studied;A new rubber seal structure was proposed and its sealing performance was verified.The three-dimensional stress expression of steady state and transient state of the sealing core parts were obtained through the theoretical analysis.The key factors affecting the integrated stress were determined and the theoretical results are compared with the simulation results,which can be used for engineering design and risk prediction.Based on the finite element analysis,the temperature field of the collet connector was simulated in five conditions.Based on the solution of the temperature field,the stress distribution and sealing contact stress of the sealing core parts under eight different working conditions were solved.Taken the engineering prototype of the collet connector as the test object,the experimental research on the jaw connector was carried out by using the special testing platform of the underwater connector.The minimum axial pretightening force was verified by the hydrostatic pressure test to meet the internal and external pressure seal conditions.Through the static pressure test to verify the semi-tight internal pressure sealing effect,the sealing performance of the new rubber seal structure.Through the temperature pressure test to verify the sealing performance of the connector under the temperature,the connector temperature field distribution.Through the sea test,the engineering application ability of the claw connector was verified.