System and method for measuring true volume of gathered-state substances with gaps

Abstract

The invention provides a system and a method for measuring true volume of gathered-state substances with gaps. The system comprises a gas input part, a closed measurement part with a gas inlet switching valve and an exhaust switching valve, as well as an exhaust part, wherein a gas-flow input switching valve of the closed measurement part which is provided with a gas pressure measurement component and has the gas inlet switching valve and the exhaust switching valve is communicated with the gas input part, and the exhaust switching valve is communicated with the exhaust part. The method comprises the following steps: adopting helium or nitrogen as a measurement medium; putting a measured substance into a sample pool of a measurement system; filling the whole measurement system with the gas measurement medium; closing the exhaust switching valve and a standard volume access valve of the measurement system; filling the closed measurement part with the gas measurement medium till pressurization pressure P2 is measured when the pressure of the closed measurement part is higher than environmental pressure of 1.195 kg / cm<2>; connecting standard additional volume with the closed measurement part and then measuring the pressure P3 of the closed measurement part; and calculating the true volume of the measured substance through calculation formula. The measurement system and the method have the advantages of high measurement precision and use convenience.

Description

Technical field: [0001] The invention relates to a measuring device and a method thereof, in particular to a true volume measuring system and method which use gas as a measuring medium to measure substances with gaps in a collection state. Background technique: [0002] At present, the measurement of the effective density of metal or compound powder is mostly based on the premise that the liquid penetrates the powder body, and the pycnometer and the bucket are used as tools for measurement. The metal or compound powder must be in contact with the liquid during the operation of the above method. For metal or compound powder substances that are easily soluble or contain soluble components or will chemically react with liquids, the accuracy of the measurement results will be greatly reduced, or even unreliable. In order to improve the accuracy of measurement, various improvements have been made to the measurement method and device, such as: the utility model patent with the aut...

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Problems solved by technology

[0002] At present, the measurement of the effective density of metal or compound powder is mostly based on the premise that the liquid penetrates the powder body, and the pycnometer and the bucket are used as tools for measurement. The metal or compound powder must be in contact with the liquid during the operation of the above method. For metals or compound powders that are soluble or contain soluble components or will chemically react with liquids, the accuracy of the measurement results will be greatly reduced, and even unreliable

In order to improve the accuracy of measurement, various improvements have been made to the measurement method and device, such as: the utility model patent with the authorized announcement number CN2735332Y discloses a method for measuring irregularly shaped solids, colloids, density, "Anhydrous Density and Volume Measuring Instrument" for volume measurement, the measuring instrument only needs to put the measured substance in a closed container, compress the gas in the container, use the isothermal process or adiabatic process in the gas state equation, etc. The principle is that the pressure is automatically converted into a volume or density value by running the compiled computer program. Although this device and method avoids the contact between the measured object and the liquid, it is difficult to achieve the initial sealing state in actual operation, and the gas is compressed. The external force will also cause the temperature to rise and lead to a non-isothermal process, so the accuracy of its measurement cannot be guaranteed, and multiple sampling and computer programming are needed to improve the accuracy; in addition, for some internal micropores connected to the external surface It is also a difficult problem to measure the real volume and density of the matter or the matter in its aggregated state and with gaps

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