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Title:
CORE BARREL SEALING STRUCTURE CAPABLE OF INCREASING SEALING-SPECIFIC PRESSURE
Document Type and Number:
WIPO Patent Application WO/2020/093415
Kind Code:
A1
Abstract:
Provided is a core barrel sealing structure capable of increasing a sealing-specific pressure, comprising a core barrel (1), a drilling machine outer barrel (2), a chain mail-type flap valve and a trigger mechanism, wherein the flap valve comprises a valve seat (31) and a chain mail-type valve flap (32); the trigger mechanism comprises a trigger inner barrel (52) and a trigger block (53), the trigger block is arranged in a through hole in a sidewall of the trigger inner barrel, and an inner wall of the drilling machine outer barrel is provided with a recessed opening (24) adapted to the trigger block; when the core barrel is located in the valve seat, the valve flap is opened by 90° and is located between the trigger inner barrel and the drilling machine outer barrel; and when the core barrel is lifted upwards to a certain height, the valve flap returns to a top face of the valve seat to make sealing contact with a sealing face (311) of a valve opening, and the bottom of the trigger inner barrel is pressed against the valve flap. The core barrel sealing structure achieves lower-end sealing by means of the chain mail-type flap valve; and the valve flap has a strong deformability, can automatically adjust a sealing matching position and has a high matching success rate. Moreover, the valve flap has a reverse self-locking property under pressure when the pressure is maintained. The valve flap also is pressed by the trigger inner barrel that has fallen back, such that the sealing-specific pressure is great, and the sealing performance thereof is reliable.

Inventors:
XIE HEPING (CN)
CHEN LING (CN)
GAO MINGZHONG (CN)
GUO JUN (CN)
ZHANG ZHILONG (CN)
ZHANG ZETIAN (CN)
LU YIQIANG (CN)
LI CONG (CN)
HE ZHIQIANG (CN)
Application Number:
CN2018/114967
Publication Date:
May 14, 2020
Filing Date:
November 12, 2018
Export Citation:
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Assignee:
UNIV SHENZHEN (CN)
UNIV SICHUAN (CN)
International Classes:
E21B25/00; F16K1/20
Foreign References:
CN107313732A2017-11-03
CN206860111U2018-01-09
CN102134980A2011-07-27
CN107514240A2017-12-26
US5253720A1993-10-19
US20150255179A12015-09-10
Attorney, Agent or Firm:
GAOYUNG INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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