深海热液采样阀耐高压塑料阀芯研究

Study on high pressure-resistant plastic poppet of deep-sea hydrothermal fluid sampling valve

为了维持深海采集的热液样品压力,提出了一种耐高压热液采样阀设计方案.针对阀芯在高压差下易发生塑性变形甚至断裂的问题,基于有限元模型仿真分析了不同结构的塑料阀芯应力分布,探讨了不同截面的应力变化情况.分析结果表明,O型圈沟槽尺寸和R2是影响阀芯应力分布的主要因素.实验研究了阀芯顶端的静态变形,阀芯变形的仿真结果与实验结果基本吻合,间接验证了应力分析的结果,表明使用优化结构阀芯的采样阀能够满足深海高压使用要求.

A new structure of hydrothermal fluid sampling valve was presented to maintain the high pressure of hydrothermal sample collected in deep sea. The stress distribution of the poppet under different structure parameters was simulated based on the finite element model to deal with the problem that the plastic poppet is easy to deform or rupture under axial load caused by high pressure difference, and the stress variety of different sections were discussed. The simulation shows that the groove dimension and R2 are the main factors that affect the stress distribution of the poppet. The experiment of the static deformation on top of the poppet indirectly validated the simulated results of the stresses. The new sampling valve with the optimized poppet structure can withstand the high pressure of deep sea.