Starting of pressure-maintaining corer sealing valve controlled by torsion spring

Abstract

The invention relates to starting of a pressure-maintaining corer sealing valve controlled by a torsion spring. The pressure-maintaining corer sealing valve comprises a flap valve, wherein the flap valve comprises a valve seat and a valve flap, one end of the valve flap is movably connected with the upper end of the valve seat through a rotating shaft, the top of the valve seat is provided with avalve opening sealing surface matched with the valve flap, the valve flap is provided with a valve flap sealing surface matched with the valve opening sealing surface, the rotating shaft is sleeved with a torsion spring, and the valve flap has a closed trend under the action of the torsion spring; a bearing surface for supporting the valve flap is arranged on the valve opening sealing surface; andwhen the valve flap is closed, the bottom of the valve flap abuts against the bearing surface of the valve seat. According to the pressure-maintaining corer sealing valve, under the action of no external force, the valve can be automatically closed under the action of the torsion spring, the flap valve can be automatically closed even if in the horizontal state, and the transition from only vertical drilling to horizontal drilling can be realized; and when the valve flap is closed, displacement constraint can be applied to the bottom surface and the side surface of the valve flap, the deformation resistance of the sealing surface can be effectively improved, the valve can bear higher pressure, and the pressure maintaining capability of the valve is improved.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a pressure-maintaining coring device sealing valve activated by torsion spring control. Background technique [0002] Core drilling is an exploration method often used in geological exploration of solid minerals. The cylindrical drill bit and the drilling tool break the rock along the circumference at the bottom of the hole, and a columnar core is kept in the center of the hole bottom, and the core is taken out from the hole to study the geological and mineral conditions, so it is called core drilling. [0003] The coring barrel usually includes the outer barrel of the drilling rig and the core barrel. The cylindrical drill bit is installed at the bottom of the outer barrel of the drilling rig. The core barrel is located at the inner periphery of the outer barrel of the drilling rig. , the core enters the core barrel from the lower end of the core barrel and is grasped by the cor...

AI Technical Summary

Problems solved by technology

The structure of the ball valve is relatively complex and occupies a large space, which limits the diameter of the drilled core. The processing technology of the ball valve is high, and when the pressure is high, the liquid in the pressure-holding cylinder will leak from the gap between the ball valve and the core cylinder. It cannot maintain a high pressure; although the existing flap valve has a simple structure and can maintain a high pressure, it relies on the trigger of the shrapnel and relies on the gravity of the valve disc itself to realize the cooperative action, so it can only be drilled under near-vertical conditions.

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