Research On The Key Technology Of Deep-sea Sediment Sampler And Ball Valves

Deep-sea microbe has enormous potential research value, and research related to marine microbe has been more and more popular. Deep-sea is an eco-system with extreme environment features which are low temperature or elevated temperature, high-pressure, high-salinity, oligotrophication and darkness. Deep-sea microbe has already adapted to the extreme situation over the course of evolution. It has been confirmed that the pressure and temperature are the crucial factors which have a great influence on metabolism, reproduction or even existence of deep-sea microbe. Therefore, it is of great significance to the researchers attempting to conduct experiments on the ground to simulate the environment that the deep-sea microbe lives in. To fulfill those laboratory experiments on the ground, a suite of equipment integrated with pressure-retaining sampling, transfer and incubation functions is an urgent requirement.Around the process of In-situ sampling and pressure-retaining transferring of deep-sea microbe, this paper aims at the research and design of deep-sea microbe sampler for In-situ sampling and pressure-retaining transferring. The author takes the analysis and discussion on the whole sampler’s design. Also the author takes the analysis and summary on the pressure sealing ways and makes them redesigned. Meanwhile, the author makes a comparison among these common pressure accumulation systems and gives a summary to choose our pressure accumulation unit. Also the author makes some related theoretical calculation of important parts and components and parameters. Carrying on from the sealing principles of the upper ball valve and the lower ball valve, the author makes theoretical study of their sealing pressure, sealing force and moment of friction, obtaining the connections between the two points, sealing pressure and moment of friction, and work pressure. Carrying on from the purely mechanical action sealing principle of the lower ball valve, the author makes the simulation computation of the sealing pressure and moment of friction between the ball and the seat, obtaining the sealing pressure distribution on the sealing surface and more accurate result of moment of friction. The author does the experiments exploration and research under different work pressure with the ball valve for pressure-retaining transfer, validating the result acquired by the theoretical study of the upper ball valve.The research is of certain novel and significance and the work could provide design and optimization references for the next study and application of two different ball valve. Especially, the design of the lower ball driven by pure mechanical energy, which skillfully uses the environment resistance and dead weight to motivate the action, upgrades the structural compactness of the ball valve and the reliability of In-situ sampling.