A gas power device capable of precise pressure control and pressurization method

Abstract

The invention discloses a gas power device capable of precisely controlling pressure and a pressurization method. The gas power device comprises a gas cylinder, a pressurization pump, a medium-pressure stop valve, a filter, a pressure reducing valve, a high-pressure stop valve and a pressure port connected in sequence; a pipe connected between the pressurization pump and the medium-pressure stop valve is connected with an electric joint pressure gauge, a medium-pressure pressure relief valve, a medium-pressure overflow valve and a high-pressure gas storage tank; a pipe connected between the pressure reducing valve and the filter is provided with a medium-pressure gauge; and a pipe between the high-pressure valve and the pressure port is connected with a gas high-pressure pressurization cylinder, a high-pressure gauge and a high-pressure pressure relief valve. The gas power device uses a hydraulic station for pushing the pressurization pump to store a gas source in a high-pressure gas storage tank; during testing, 0-35 MPa pressure rise-maintenance-reduction is realized through adjustment by the pressure reducing valve and a gas high-pressure pressurization cylinder; and when the testing pressure exceeds 35 MPa, the gas high-pressure pressurization cylinder is rotated by a hand to realize pressure rise-pressure maintenance-pressure reduction, so that the stability of the gas pressurization and pressure reducing process can be achieved, the noise and the vibration are reduced, and the control precision of the pressurization and pressure reducing process is improved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature and high-pressure experimental devices, and in particular relates to a gas power device and a pressurization method capable of precisely controlling pressure. Background technique [0002] In the process of simulating changes in the physical and chemical properties of deep rocks in the earth, many experimental devices for high temperature and high pressure have been developed. In order to obtain the property changes of certain rocks and minerals under different pressures, it is often necessary to precisely control the pressure of the experimental device. For example, in a high-temperature and high-pressure pressure vessel, if water is used as the pressure transmission medium, when the medium is in the phase of vapor-liquid coexistence, the confining pressure in the sample chamber is actually strictly equal to the saturated vapor pressure of water, which cannot be determined independently ...

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Problems solved by technology

[0005] (1) The power of the pneumatic booster pump comes from compressed air, and the demand for compressed air as power is often large. Compressed air is not suitable for providing compressed air, so compressed air requires an air compressor, and the general air compressor The vibration and noise are large, even the silent air compressor cannot meet the demand, and it cannot be installed near the spectrometer;

[0006] (2) The general high-pressure pneumatic booster pump has a large single-stroke displacement, and the gas booster pump with a small single-stroke displacement has a single-stroke displacement of 19.7 mL, which cannot meet the requirements of precise pressurization and decompression;

[0007] (3) Generally, booster pumps for reciprocating pressurization need to use check valves. Due to the structural characteristics of check valves, the single minimum throughput of check valves is generally relatively large, which cannot meet the requirements of precise pressurization and precise depressurization. Requirements, and due to the existence of the check valve, the booster pump cannot be used for step-down control

[0008] (4) Most of the gas depressurization schemes widely used at present are to directly open the pressure relief valve for pressure relief, or to depressurize through the pressure relief valve, but the mechanical structure characteristics of the pressure relief valve determine the control of the pressure relief valve. The precision of pressure reduction is poor. At present, there is no suitable pressure reducing valve that can achieve a pressure control accuracy of 0.1 MPa within the pressure range of 0-100 MPa and the flow rate is small.

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