A lvdt displacement sensor used under high temperature and high pressure

Abstract

The invention discloses an LVDT displacement sensor used at high temperature and under high pressure. The sensor comprises a high-temperature and high-pressure connecting component and a displacementdetection component which are distributed axially and connected through cylindrical surface positioning threads, a high-temperature-resistant and high-pressure-resistant sealing ring I is arranged between the high-temperature and high-pressure connecting component and the displacement detection component, and the high-temperature and high-pressure connecting component closely attached to the displacement detection component is movably sleeved with a cooling water jacket. The displacement sensor can adapt to multiple media and samples, can conduct tests at high temperature and under high pressure and meet the measurement accuracy requirement, is convenient and reliable to use and low in maintenance cost, overcomes defects of the prior art and achieves good effects.

Description

technical field [0001] The invention relates to a displacement sensor, in particular to an LVDT displacement sensor used under high temperature and high pressure, and belongs to the technical field of material testing equipment. Background technique [0002] Mechanical parameters such as elastic modulus, yield strength, Poisson's ratio, enduring strength, and ultimate failure strength, as the most basic physical constants of materials, are the basic data of many applied researches and are widely used in all walks of life. With the development of human Exploration space extends to deep space and deep ground, such as deep sea resource mining, deep earth prospecting, and engineering applications are developing to higher temperature and pressure, such as ultra-supercritical units, nuclear reactor pressure vessels, etc., facing more harsh environmental conditions, high temperature and high pressure It is one of them. As a research application, the mechanical performance parameter...

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Problems solved by technology

[0003] (1) For general-purpose triaxial stress testing machine deformation measurement, the commonly used sensors are strain gauges and strain gauges, which can measure various deformations such as axial and radial directions. The advantage of using these two sensors is direct measurement, and the measurement data is relatively accurate, but There are problems such as high sensor installation requirements and troublesome lead wires. The test will fail if the link is cumbersome. At the same time, for the protection of the sensor, there are also high requirements for the heating and pressurizing medium. However, in the supercritical state, many liquid media have extreme Strong oxidative corrosion, in order to avoid sensor damage and short circuit, the device cannot be used in weak corrosive media such as water, and water, low-concentration salt solution, acid-base solution are the media needed for our geoscience research, which greatly limits the existing The scope of use of the equipment;

[0004] (2) For conventional general-purpose triaxial stress testing machines, the heating medium is silicone oil for sensor protection, and due to the limitation of ignition point, its heating temperature is ≤400°C, so the operating temperature of the equipment is relatively low;

[0005] (3) There are relatively many axial strain measurement methods for special pressure testing machines, but in terms of radial strain measurement, under high temperature and high pressure ≥ 400 °C, there is a lack of good methods, mainly lacking suitable sensors, which can be used in protective gas media Through optical measurement and other methods, but the equipment price is relatively high. At the same time, due to the serious influence of liquid on light, optical measurement is not suitable for liquid media, especially when the medium becomes turbid during the test process, and the test cannot be carried out at all. In the case of liquid media, there is currently no such method. A very good solution, the main reason is the lack of a sensor for measuring radial deformation under high temperature and high pressure

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