Multi-stage axial confining pressure ratio rock core holder suitable for hydrogen permeation and method

By designing a multi-stage confining pressure ratio core holder, and utilizing the linkage control of the confining pressure chamber and the axial pressure chamber, as well as a hydrogen-blocking sealing structure, the problems of sealing and miniaturization in hydrogen permeation experiments were solved, thus achieving accuracy and safety in hydrogen permeation experiments.

CN122448703APending Publication Date: 2026-07-24INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI +1
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Patent Information

Application Number
CN202610341729.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-19
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing clamps are difficult to guarantee the sealing of hydrogen gas and are also difficult to achieve multi-stage axial compression loading and device miniaturization.

Method used

A multi-stage axial pressure ratio core holder was designed. By coordinating the confining pressure chamber and the axial pressure chamber, the proportional output of axial pressure and confining pressure is controlled by multi-stage connecting pipes and valves. A sealing structure consisting of a hydrogen-blocking sleeve and a hydrogen-blocking sealing ring is adopted to achieve miniaturization of the device and effective sealing of hydrogen.

Benefits of technology

This approach ensures the accuracy and safety of hydrogen permeation experiments, reduces the use of large hydraulic equipment, and guarantees the compactness of the apparatus and the reliability of hydrogen experiment results.

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Abstract

The invention discloses a multi-stage axial confining pressure ratio rock core holder suitable for hydrogen permeation and a method, and relates to the field of rock seepage mechanical engineering, the multi-stage axial confining pressure ratio rock core holder comprises a cavity cover and a base, an axial pressure chamber is arranged at the top of the cavity cover, and an axial pressure head is installed in the axial pressure chamber; a multi-stage axial pressure chamber structure is coaxially arranged in the axial pressure chamber; the base is provided with a hydrogen-resistant sleeve, and a rock core chamber is formed in the hydrogen-resistant sleeve; an axial pressure piston at the end of the axial pressure head is matched with the top of the hydrogen blocking sleeve, a confining pressure chamber is formed between the outer wall of the hydrogen blocking sleeve and the inner wall of the cavity cover, and the side face of the confining pressure chamber is connected with an oil inlet pipe; the top of the rock core chamber is connected with an air outlet pipe; the axial pressure chamber is connected with the confining pressure chamber through a multi-stage communicating pipe to form a multi-stage axial confining pressure transmission structure; the multistage communicating pipe is provided with a valve and used for controlling the output ratio of the multistage shaft confining pressure transmission structure. The axial pressure and confining pressure constant-proportion output can be realized, and the volume miniaturization of the device is realized.
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