Self-pressurization measuring method for heat leakage amount of low-temperature heat-insulation gas cylinder
A technology of low-temperature heat insulation and measurement methods, which can be applied to container discharge methods, container filling methods, pressure vessels, etc., and can solve problems such as complex processes and long heat leakage times
Inactive Publication Date: 2021-04-30
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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[0003] The purpose of the present invention is to solve the technical problems existing in the prior art, to provide a self-pressurized measurement method for the heat leakage of low-temperature insulating gas cylinders, which solves the problem that the daily evaporation rate measurement of the heat leakage takes a long time in the measurement of the vacuum insulation performance of low-temperature insulating gas cylinders , complex process and other issues, the measurement method is simple, reliable and efficient
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[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention; the terms used in the specification herein are only for the purpose of describing specific embodiments, and are not intended to To limit the invention, for example, the terms "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top ", "bottom", "inner", "outer" and other indicated orientations or positions are based on the orientations or positions shown in the drawings, which are only for convenience of description and cannot be understood as limitations on the technical solution.
[0036] The terms "include" and "have" in the specification and claims of the present invention and the description of the above drawings, as well as any variations thereof, are intended to cover a non-exclusive inclusion; The terms "first", "second", etc. are used t...
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The invention relates to the technical field of heat-insulation gas cylinder measurement, and discloses a self-pressurization measuring method for heat leakage amount of a low-temperature heat-insulation gas cylinder. The method comprises the following steps: firstly, charging a test medium in an inner cavity of the low-temperature heat-insulation gas cylinder containing a liquid level meter, and arranging a pressure sensor at a gas outlet of the low-temperature heat-insulation gas cylinder; measuring to obtain an average liquid level value in the gas cylinder through the liquid level meter, and obtaining the pressure value in the gas cylinder through the pressure sensor; according to the law of conservation of gas and liquid mass in the gas cylinder, obtaining the relationship between the liquid level values of the liquid level meter at the initial measurement moment and the end measurement moment; according to the average liquid level value and the relationship between the average liquid level value and the liquid level values at the initial measurement moment and the end measurement moment, calculating to obtain the liquid level values at the initial measurement moment and the end measurement moment; obtaining the mass of evaporated liquid in the gas cylinder according to the liquid level values at the initial measurement moment and the end measurement moment; and calculating to obtain a heat leakage amount value of the low-temperature heat-insulation gas cylinder, and converting the heat leakage amount value into a daily evaporation rate value. The measuring method is simple, reliable and high in efficiency.
Description
technical field [0001] The invention relates to the technical field of measurement of heat-insulated gas cylinders, and more specifically relates to a self-pressurized measurement method for leakage heat of low-temperature heat-insulated gas cylinders. Background technique [0002] With the rapid increase of domestic demand for various gases, many companies choose cryogenic liquids to store gases, which effectively promotes the rapid development and application of domestic cryogenic insulating gas cylinders. During the use of cryogenic insulating gas cylinders, it is necessary to regularly measure their daily evaporation rate values to reflect Vacuum insulation properties of cryogenic insulated gas cylinders. The daily evaporation rate value essentially reflects the heat leakage of cryogenic insulating gas cylinders under test conditions, so the heat leakage can be directly measured to reflect the vacuum insulation performance of cryogenic insulating gas cylinders, ensurin...
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IPC IPC(8): F17C13/02F17C13/00F17C1/12
CPCF17C13/025F17C13/021F17C13/002F17C1/12
Inventor 李正清马敏李晓霞李小金马凤英蔡宇宏王毅何丹韩仙虎
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH