RU-2861694-C1 - METHOD FOR DETERMINING PRESSURE OF MEDIUM IN SEALED CONTAINER

Abstract

FIELD: measuring technology. SUBSTANCE: group of inventions relates to means for determining the pressure of a medium in sealed containers. The essence: using strain and temperature sensors. Wherein the strain sensors are installed directly on the surface of the container under study at a distance from stress concentrators. In the invention according to the first embodiment, measuring strain, temperature and pressure before sealing the container. Measuring strain and temperature after sealing the container. Based on the measurement results, calculating the pressure. In the invention according to the second embodiment, changing the temperature of the container during the pressure determination process. Wherein, strain and temperature are recorded before and after the temperature change. Based on the measurement results, calculating the pressure. EFFECT: expanding the scope of use and reducing the complexity of determining pressure in a sealed container. 2 cl

Inventors

• Bobrovskij Yan Olegovich

Dates

Publication Date

20260507

Application Date

20250605

Claims (2)

1. 1. A method for determining the pressure of a medium in a sealed container, which uses strain and temperature sensors, and calculates the pressure using an electronic computer, characterized in that the strain sensors are installed directly on the surface of the container being tested at a distance from stress concentrators, measure the strain, temperature, and pressure before sealing the container, measure the strain and temperature after sealing the container, and calculate the pressure based on the measurement results.
2. 2. A method for determining the pressure of a medium in a sealed container, which uses strain and temperature sensors, and calculates the pressure using an electronic computer, characterized in that the strain sensors are installed directly on the surface of the sealed container being tested at a distance from stress concentrators, and the temperature of the container is changed during the process of determining the pressure, with the strain and temperature being recorded before and after the temperature change, and the pressure is calculated based on the measurement results.

Description

The invention relates to methods for contactless pressure determination and can be used for rapid determination and continuous monitoring of pressure in sealed containers. The method may be preferably used to determine the pressure in containers whose design does not provide for pipes, openings, or mounting locations for connecting equipment units and pressure measuring instruments, including: at enterprises operating containers; in rocket and space technology products; during the operation of hydraulic and gas systems; during long-term storage of radioactive, chemically, and biologically hazardous substances; and when monitoring the pressure in sealed products after manufacture. A device for contactless measurement of gas pressure in a cylinder is known, including an autogenerator that excites transverse oscillations of the cylinder, an electromagnetic transverse oscillation sensor and a frequency meter according to patent RU 2154263 C2, IPC G01L 11/00, published in bulletin No. 22, 10.08.2000. The principle of measuring pressure in a cylinder by the said device is based on the relationship between the frequencies of its free oscillations and the internal pressure. A disadvantage of the invention is that the gaseous medium in cylinders typically has low density and viscosity, resulting in low values of its added mass and viscosity-related dissipative forces acting on the container. Due to this, the sensitivity of the cylinder's free vibration frequencies to pressure changes is low, leading to high measurement errors using this method. Furthermore, vibration exposure to the container is unsafe in the presence of explosive or toxic gases, as it can cause damage and leakage of the hazardous medium. A method for monitoring the pressure of gas cylinders using ultrasonic means is known, which includes receiving signals from an acoustic wave source that have passed through the gas medium and the cylinder body using an acoustic sensor, and recording the latter using an oscilloscope according to patent RU 2548059 C1, IPC G01L 11/06, published in bulletin No. 10, 10.04.2015. The disadvantage of the method is that under low pressure conditions, when the equation of state of an ideal gas is valid, in the absence of heat supply, low viscosity and low thermal conductivity, the speed of sound in the medium depends only on the temperature and does not depend on the pressure Golubev A.G., Kalugin V.T., Lutsenko A.Yu. (et al.) Aerodynamics: textbook - M .: Publishing house of Bauman Moscow State Technical University, 2010 .-- 687 p, UDC 533.6 (075.8) BBK 22.253.3. The speed of sound in the container material, in turn, depends only on its physical and mechanical properties, which makes pressure measurement by this method impossible. Furthermore, according to paragraph 5.3.12 of GOST 31438.1-2011 "Explosive Atmospheres. Explosion Protection and Explosion Prevention. Part 1," explosive atmospheres can ignite when exposed to ultrasonic waves. Furthermore, external interference, including noise from engines, equipment, and personnel, affects the acoustic signal and, consequently, measurement accuracy. A method for monitoring gas pressure in a nuclear reactor fuel element (FER) is known. The method involves generating a thermal pulse on the FER using an induction heater, performing multiple operations on the FER during the implementation of the method, and performing a mathematical calculation according to patent RU 2408098 C2, IPC G01C 17/06, G01L 11/06, published in Bulletin No. 36, December 27, 2010. This method is based on local heating of the FER and using temperature changes to calculate the internal gas pressure. The disadvantage of this method is the impossibility of continuous and real-time monitoring of the pressure in the tank, the sequential conduct of multiple experiments, the need for research and development to find calibrated characteristics for comparing experimental data with internal pressure, as well as the high labor intensity of the method, especially if labor-intensive measurements need to be performed on a large number of tanks. The closest invention in terms of its features is the "Method and System for Non-Contact Pressure Measurement Based on Strain Sensors and Temperature Sensors," which includes calibration and pressure measurement processes. The calibration process involves experimentally obtaining a calibrated dependence of the pressure in the measuring (calibration) pipeline on the temperature and deformation on its surface, as well as programming this dependence into an electronic computer. The pressure measurement process involves connecting the measuring pipeline to the tank under study, followed by calculating the pressure using the obtained calibrated dependence on the deformations and temperature measured on the surface of the measuring pipeline, according to patent CN 111649869 B, IPC G01L 19/00, G01L 19/04, G01L 27/00, published 15.10.2021. The disadvantage of this method is its limited sco