A novel ultra-high pressure pressure sensor and pressure detection method

Abstract

The invention discloses a novel superhigh pressure sensor and a pressure detection method. According to the sensor, a bottom portion of a body is provided with an oil inlet opening and an oil return opening, the body is sequentially provided with a ceramic core, a steel rod core and a spring rod, the spring rod is provided with a pre-compression spring, the ceramic core and the steel rod core are inserted in a ceramic sleeve, the top portion of the body is provided with a displacement sensor contacting with the spring rod, an oil return path is provided with a damping unit. The method comprises steps that pressure is applied to the bottom portion of the ceramic core, the generated force is transmitted through the steel rod core to the spring rod, the spring rod under the action of the force compresses the pre-compression spring and generates displacement, a spring force generated by compressing the pre-compression spring, gravity, frictional force, inertia force, viscosity resistance and pressure reach a balance state, after displacement of the ceramic core is detected through a displacement sensor, a specific value of the measured force can be acquired through pressure compensation. The sensor is advantaged in that pressure measurement requirements of a superhigh pressure hydraulic system can be satisfied, the structure is simple and compact, high reliability is realized, and the sensor is slightly influenced by temperature.

Description

technical field [0001] The invention relates to the technical field of measuring fluid pressure, in particular to a novel ultra-high pressure pressure sensor and a pressure detection method. Background technique [0002] A pressure sensor is a sensitive device for detecting fluid pressure that converts pressure into an electrical signal output. It is generally composed of an elastic sensitive element and a displacement sensitive element (or strain gauge). The function of the elastic sensitive element is to make the measured pressure act on a certain area and convert it into displacement or strain, and then the displacement sensitive element or the strain gauge metal element The analyzer converts this into an electrical signal that is related to the pressure. [0003] At present, the ultra-high pressure hydraulic system (above 70MPa) has become an important direction for the development of modern hydraulic technology. In the ultra-high pressure hydraulic system, strain gauge...

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Problems solved by technology

[0003] At present, the ultra-high pressure hydraulic system (above 70MPa) has become an important direction for the development of modern hydraulic technology. In the ultra-high pressure hydraulic system, strain gauge pressure sensors are usually used, which have the advantages of large measuring range, high precision, impact resistance and strong stability. ; but when the hydraulic system oil temperature changes greatly, the deformation characteristics of the strain gauge will be affected by the temperature, which will cause problems such as temperature drift and measurement error; in addition, the deformation of the strain gauge and the detected pressure are not linear , which also affects its pressure measurement accuracy

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