Design Of Pressure Compensator And Experimental Research On The Gas-tightness Of Gas-tight Sample Bottle

The tightness of gas-tight sample bottle is guaranteed by pressure compensator, therefore the design of pressure compensator is the focus of designing gas-tight sample bottle. The primary work of this dissertation focus on designing the pressure compensator as well as testing the tightness of the gas-tight sample bottle, both in the high-pressure tank, and in the sea.Firstly, based on the theory research on the geometric and material nonlinearity, build up the finite element model of the O-Ring according to relevant constitutive model, and carry out the finite element analysis on the O-Ring, as a result get the impact of several parameters on the tightness and friction. According to the result, choose the optimum parameters. The experiment carried in the lab testify the validity of the analysis. Secondly, design the experiment in the high-pressure tank which can simulate the working environment of the gas-tight sample bottle, and the result proved that the sample bottle with the pressure compensator is gas-tight. Lastly, carry out the sea trial on the gas-tight sample bottle, take advantage of the test&controlsystem composed of the test&control software. CTD,and release appliance to obtain the sea water in a certain depth, in contrast with the sample bottle which is not gas-tight, the concentration of CH4 and CO₂ contained in the sample obtained by the gas-tight sample bottle is higher than the one that is not gas-tight, which prove the tightness of the gas-tight sample bottle further, meanwhile testify the validity of designing pressure compensator.