A Pressure-Holding Sampling Device for Macro Organisms in Hadal Trenches

The deep sea is a huge treasure trove of biological resources, but so far researches on deep-sea organisms is far from enough. This study designed an hadal trenches macro organisms sampling device that can be used at a depth of 11,000 m. This research mainly solves the problem of pressure compensation mechanism during the recovery of the sampler and the sealing problem of ultra-high pressure hydraulic system. The theoretical analysis and calculation of the high pressure mechanism leakage model, the wall thickness of the sampling cylinder, the pressure loss of the sampling cylinder, and the inflation volume of the pressure compensation mechanism are carried out. This study provides a detailed description of the organism trapping mechanism. Finite element analysis of key components was performed to determine its feasibility. In order to verify the reliability of the device, a pressure test is performed on the ultra-high pressure vessel to prepare for the sea trial.