Research On Structure And Sealing Performance Of Telescopic Underwater Docking Device In Underwater Vehicles

With the increasing number of exploiting marine resources and underwater operations,underwater docking operations are increasingly frequent.Underwater docking devices as the necessary equipment to accomplish the underwater docking task,the improvement and development of its technology is of great significance.In order to make the manned submarine have the dual functions of cruising and docking,a new type of underwater docking device is developed,which can be embedded in the hull to reduce the flow resistance when there is no docking operation,in contrast,which extends to complete the exchange of personnel and supplies when docks.The article summarizes the development status of underwater docking technology and related technology at home and abroad.According to the analysis of working environment and docking process,the overall scheme of deep sea retractable docking device is proposed.According to the functional requirements of the docking device,it is divided into four parts:the pressure shell,the locking mechanism,the sealing structure and the driving system,the comparison of structural schemes applicable to each part is completed,and the detail design of each main structure are completed.Due to the design depth of the docking device is 1000 meters,in order to ensure the reliable strength and stability of the device,theoretical analysis and simulation methods are used to analyze the bearing capacity of the pressure housing and the locking mechanism,the size of the key structure of the docking device was determined.The optimization model of the docking device is established,based on the sensitivity analysis of the structural parameters and the fitting accuracy of response surface model to meet the requirements,the optimal design was carried out to achieve the minimum weight.The stability analysis of the fixed skirt and the movable skirt proves the reliability of the optimized structure size.In order to ensure the reliability of the locking mechanism,the self-locking condition of the ramp,the clamping force of the clamp and the tension of the pin are analyzed,The mathematical model of the movement of the three-flap clamp is established and the relationship between the displacement of the nut and the radial displacement of the center clamp is obtained.The locking and unlocking process is theoretically analyzed and verified by kinematics simulation.The failure modes of the locking mechanism components are analyzed.Finite element strength analysis is carried out under the worst conditions,The influence of the circumferential non-uniformity of the three-piece clamp structure on the distance between the sealing surfaces of radial seal and the contact pressure distribution on the contact surface of the docking platform after the deformation of the docking device under the sea water pressure was studied.According to the structural characteristics of the docking device,The finite element method is used to simulate the rectangular groove O-ring of the flange end face,T-ring and C-ring,and the optimal compression of the rectangular groove O-ring and T-ring is determined Comparatively analysis the sealing performance of T-shaped ring and the ordinary square glyd ring,T-shaped ring has the unique advantages such as allowing a larger extrusion gap,excellent static sealing performance and significantly improving the leakage state in the dynamic seal The sealing performance of its is verified to meet the requirements.The influence of the key parameters of the radial seal structure on the sealing performance of the C-shaped ring is analyzed.The optimal structural parameters are obtained to ensure that the ring had a good seal effect.