【作者】 牛文达；

【导师】 杨灿军；

【作者基本信息】 浙江大学 ， 机械电子工程， 2010， 硕士

【摘要】 气密采水瓶的密封性是由压力补偿器来保证的,因此压力补偿器的设计是采水瓶设计的核心,本文主要完成对气密采水瓶压力补偿器的设计并通过高压舱试验和海上试验来检测安装压力补偿器后采水瓶的密封性能。首先,对压力补偿器密封件O形橡胶密封圈的非线性特性进行理论研究,确定橡胶的本构模型,对O形橡胶密封圈建立有限元模型,结合O形圈的密封机理和摩擦特性,对其进行有限元仿真分析,得到几个不同参数对其密封和摩擦性能的影响,从而得到优化的设计参数。为了验证仿真结果,在试验室进行了简单的试验,试验与仿真结果一致性较好。接着,通过设计高压舱试验,使采水瓶内部压力升高到40MPa模拟真实的水下4000米工作环境,通过预充气体的方法来验证呆水瓶的密封性能,该高压试验初步证明了安装压力补偿器后采水瓶具有良好的密封性能。最后,把气密采水瓶带到海上试验,下放时同时携带非气密采水瓶,利用LabVIEW编写的测控软件和温盐深仪、释放机构组成的测控系统,实现对海水自动采样,通过试验对比发现在同一深度下气密采水瓶采集的样品中甲烷和二氧化碳气体含量明显高于非气密采水瓶采集的样品,进一步验证了安装压力补偿器后采水瓶具有良好的密封性能,同时说明了利用有限元法设计压力补偿器的正确性。更多还原

【Abstract】 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.更多还原