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)
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:
PCT/CN2018/114967
Publication Date:
May 14, 2020
Filing Date:
November 12, 2018
Export Citation:
Assignee:
UNIV SHENZHEN (CN)
UNIV SICHUAN (CN)
UNIV SICHUAN (CN)
International Classes:
F16K1/20; E21B25/00
Foreign References:
| CN107313732A | 2017-11-03 | |||
| CN206860111U | 2018-01-09 | |||
| CN102134980A | 2011-07-27 | |||
| CN107514240A | 2017-12-26 | |||
| US5253720A | 1993-10-19 | |||
| US20150255179A1 | 2015-09-10 |
Attorney, Agent or Firm:
GAOYUNG INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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