Full-sea depth multi-point in-situ sampler, and sampling and transfer method using the same

A full-sea depth multi-point in-situ sampler, comprising:

• a sampling assembly;
• a pressure-retaining assembly;
• a pressure-compensating assembly;
• and
• a cleaning assembly;
• wherein the sampling assembly comprises a handle, an extrusion valve, a needle valve core, a first piston, a sampling tube, and a capturing member;
• an upper part of the sampling tube is threadedly connected to a lower part of the needle valve core;
• a lower end of the handle is boltedly connected to a top of the needle valve core;
• the first piston is provided on an inner wall of the sampling tube, and the first piston is a two-stage piston;
• an upper side wall of the sampling tube is provided with a plurality of drainage holes;
• a bottom of the sampling pipe is provided with the capturing member;
• the extrusion valve is fixedly connected to the handle through a first fixing plate;
• the extrusion valve comprises a first pressure pipe, and is connected to the needle valve core through the first pressure pipe;
• and the first pressure pipe is configured to pass through the needle valve core to communicate with a cavity above the first piston;
• the pressure-retaining assembly comprises a pressure-retaining cylinder, a locking mechanism, a floating valve core, a support spring, and a drainage device;
• the pressure-compensating assembly comprises a pressure-compensating cylinder, a second piston, and an end cap;
• and
• the cleaning assembly comprises a cleaning sleeve, a cleaning cylinder, and a plurality of trigger mechanisms.