Core barrel sealing structure capable of increasing sealing-specific pressure

A core barrel sealing structure comprising a core barrel, a drilling machine outer barrel, a chain mail-type flap valve, and a trigger mechanism;

• the chain mail-type flap valve includes a valve seat and a chain mail-type valve flap, wherein the valve seat is coaxially installed on the inner wall of the drilling machine outer barrel, one end of the valve flap is movably connected with an outer sidewall of an upper end of the valve seat;
• the upper end of the valve seat has a valve opening sealing surface adapted to the valve flap;
• the valve flap includes an elastic sealing ring, elastic connecting strips, sealings, and a plurality of locking strips arranged in parallel;
• the elastic connecting strip connects all the locking strips in series, and the elastic sealing ring loops all the locking strips together to form an integral structure, and the sealings are located between adjacent locking strips;
• the trigger mechanism comprises a trigger inner barrel and a trigger block, and a side wall of the trigger inner barrel is provided with a through hole, the trigger block is arranged in the through hole;
• wherein an outer wall of a bottom of the core barrel is provided with a protrusion that matches the trigger block, the inner wall of the drilling machine outer barrel is fitted with a recessed opening adapted to the trigger block, the trigger block is located above the valve flap, and the recessed opening is located above the trigger block;
• when the core barrel is located in the valve seat, the trigger inner barrel is located between the core barrel and the drilling machine outer barrel, a lower end of the trigger inner barrel is mated with the valve seat, the trigger block protrudes from the inner sidewall of the trigger inner barrel and the valve flap is opened by 90° and is located between the trigger inner barrel and the drilling machine outer barrel;
• when the core barrel is lifted a certain distance above the valve seat, the valve flap returns to a top face of the valve seat to make sealing contact with the valve opening sealing surface, adjacent locking strips are in sealing contact, and a bottom of the trigger inner barrel is pressed against the valve flap.