MFPD: Multi-sequence Flow-through Pressure-retaining Sampler for Deep sea Geofluid Research

Deep-sea hydrothermal, cold spring activities and other bottom water bodies are of great significance in the study of seabed geological activities. In recent years, researchers have put forward higher requirements for the sampling operations of deep-sea equipment in terms of sampling purity, sample gas component preservation capabilities, and sequential sampling capabilities. Based on the flow-through deep-sea sequence sampling mechanism, with high fidelity and sampling capability as the design goal. In this paper, a new type of Multi-sequence Flow-through Pressure-retaining Sampler for Deep-sea Geofluid Research is designed and a working mode based on flow-through sequential sampling is proposed. The numerical simulation method is used to study the liquid-liquid displacement efficiency between the target sample and the pre-filled water in the flow-through sampling. An incomplete bevel gear mechanism is designed, which can efficiently trigger control of multiple sampling sequences. At the same time, the pressure shock effect of switching valves at large depths is discussed. Finally, the two prototype prototypes trial-produced according to the design scheme of this article can suppress cross-contamination in sequence sampling and improve sampling purity. At the same time, it has an air tightness of 40 MPa level and the sequential sampling capability of four channels.