Study of the Sealing Characteristic of Polytetrafluoroethylene-Coated O-Ring Applied in Gas-Tight Deep-Sea Water Sampler

Abstract

In ocean science research, it often requires the integrity of the gas content in samples of seawater. The gas-tight deep-sea water sampler (GTWS) based on pressure self-adaptive equalizer (PSAE) can satisfy the requirement very well. The PSAE is required to achieve a reliable dynamic sealing in deep sea. The general O-ring is difficult to meet this requirement. The polytetrafluoroethylene (PTFE)-coated O-ring is chosen as the sealing parts. The finite element analysis (FEA) software ANSYS is used to analyze the contact pressure of the PTFE-coated O-ring in different conditions, that is, analyze the GTWS’s gas tightness theoretically. Combine with the sea trial results, the feasibility and reliability of the PTFE-coated O-ring in deep-sea dynamic sealing in PSAE can be prove both in theory and practice.

Analysis of reciprocating O‐ring seal in the pressure‐balanced oil‐filled wet‐mate electrical connectors for underwater applications

“…The number of nodes in the sealing area along the x-axis direction is determined by the actual contact width of the seal in the Finite Element Analysis (FEA) model. The above equations, (2), (4), and (11), are discretized and solved in MATLAB according to the computational procedure.…”

“…However, the linear elastic model they adopted was not suitable for the seal materials. Later, Huang et al used the hyperelastic material model in the finite element analysis software ANSYS to accurately analyse the stress state of the piston seals used in the deep sea water samplers, which had a sealing system similar to that of wet‐mate connectors. They evaluated the sealing performance by calculating the maximum contact pressure and found that the PTFE‐coated O‐ring was better than the ordinary Viton O‐ring.…”

Study on the Titanium Film in the Pressure Self-Adaptive Water-Tight Junction Box of Underwater Vehicle

“…Use augmented lagrange Materials Processing Technology II formula as the method of finite element analysis. In order to simulate the internal oil pressure, load pressure from 0MPa to 0.05MPa onto the beneath surface of the film, which is divided into 40 steps linearly [14]. We draw the simulation results of the stress and strain of the titanium film under the internal pressure shown in Fig 5a and 5b, we can conclude that the connection part of the film with the hood of the titanium film has the maximum stress and strain.…”

Structure design and sealing performance analysis of the sealing mechanism of the drilling tractor

“…Li et al 8 studied the solution method for the following dynamic characteristics of oil‐gas two‐phase dynamic pressure seal based on fluid solid thermal coupling. Huang et al 9 studied the dynamic sealing performance of the O‐ring in the pressure self‐adaptive equaliser.…”