SU714156A1 - Method of determining the volume of vessels - Google Patents

Description

The invention relates to measurements, namely, methods for determining the volume of capacities.

There is a method for determining the volume of capacities using a reference tank, in which an arbitrary initial gas (air) pressure is equalized in the measured and reference tanks, then part of the gas is pumped from the measured tank to the reference, gas pressure is recorded in the reference and measured tanks after pumping the gas and calculate the desired volume [1].

However, the known method does not provide the necessary accuracy in determining the volumes due to the fact that during pumping, a change in gas temperature occurs and thereby introduces a systematic error. 20

A known method for measuring tank volumes is based on transferring gas from a calibrated tank to a measured one, recording pressures in calibrated and measured tanks after a bypass, and then calculating the measured volume [2].

Due to the change in gas temperature during bypass due to changes in the internal energy of the gas, this SpOzobomZO also does not provide the necessary accuracy in determining the volume.

The purpose of this invention is to improve the accuracy of measuring the volume of the tank.

For this, after bypassing the gas from. calibrated capacity into the measured one and registration of the resulting pressure by-pass, the gas is transferred from the measured capacity to the calibrated one.

In this case, the pressure in the measured capacity and the pressure drop between the tanks before the return bypass are respectively maintained equal to the pressure in the calibrated tank and the pressure drop: between the tanks before the direct bypass, and the desired volume is calculated by the formula / (Ρ _κ -ΡΧΡ'-ζ) '^ ISM (РР Р X Р '' where УимЖк “volumes of measured and calibrated capacities;

P _to P _MiM - pressure in calibrated 'and the measured capacitance to a direct bypass;

P is the steady-state pressure in the system after direct bypass;

Pg, PxjM ~ pressure in calibrated and measured tanks before reverse bypass;

P 'is the steady-state pressure in the system after the reverse bypass. _

The drawing shows in principle ^e Naya diagram of the device for determining the volume of the containers.

The measurement is as follows. ,. _

In creating the calibrated container 1 ^{', and} an excess relative to the measured pressure vessel 2, which is registered with pressure gauges. 3 and 4. Using valve 5, the gas is directly transferred from the calibrated tank to the measured one and the pressure P. 2 and the pressure difference between tanks 1, 2 should be the same as before directly bypassed. Registration of pressure is produced by devices 3, 4. 25

Reverse bypass of the measured capacitance to calibrated is carried out and the pressure P. established in the system is recorded.

Using the method will allow jq to increase the accuracy of measuring volumes of sealed products.

Claims (2)

The invention relates to measurements, namely methods for determining the volume of containers. The known method of determining the volumes of the containers with the help of a reference tank, in which an arbitrary initial gas (air) pressure is equalized in the measured and reference tanks, then a part of the gas is pumped from the measured tank to the reference pressure in the reference tank. gas pumping and calculating the required volume 1. However, the known method does not provide the necessary accuracy of determining the volumes due to the fact that during pumping the gas temperature changes and thus is introduced with a static error. ; A known method for measuring volumes of containers is based on the bypass of gas from a calibrated container to a measured one, recording the pressures in the calibrated and measured tanks after the bypass and then calculating the measured volume 2. Due to the change in gas temperature during the bypass due to the change in the internal energy of the gas this method also does not ensure the required accuracy of volume determination. The purpose of the invention is to improve the accuracy of measuring the volume of the container. To do this, after the bypass gas out. the calibrated tank in the measured one and the registration of the resulting pressure bypass is carried out by passing the gas from the measured tank into the calibrated one. At the same time, the pressure in the measured capacity and the pressure drop between the containers before the return bypass are maintained, respectively, by the pressure in the calibrated capacity and the pressure drop: between the tanks before the direct bypass, and the desired volume is calculated using the formula -v / -PXP-P) ( rr -) (р V (P where Уи Ук - volumes of measured and calibrated containers; pressure in calibrated and measured capacities before direct bypass; Р - steady state pressure in the system after direct bypass; RC, PHJM pressure in calibrated and measured capacitances before P is the steady state pressure of the system after the reverse bypass. The drawing shows a basic diagram of the device for determining the volume of the tanks. The measurement is carried out as follows, see, In calibrated tank 1, I create a pressure that is excessive with respect to the measured capacitance 2 pressure meters 3 and 4 are recorded by measuring instruments. Using valve 5, the gas is directly transferred from the calibrated tank to the measured one and the pressure P established in the system is recorded. pressure is exact with respect to tank 1, the pressure in tank 2 and the pressure differential between containers 1, 2 must be the same as before the direct bypass, pressure is recorded by instruments 3, 4. The reverse bypass is performed by g & for a measured capacitance into a calibrated one and the pressure R. established in the system is recorded. Using the method will improve the accuracy of measuring the volumes of sealed products. Claims The method for determining the volumes of containers by passing gas from a calibrated container to a measured one and measuring the pressure in these tanks is different in that, in order to improve accuracy, after the gas has been bypassed from a calibrated container, the gas is returned to bypass the measured capacity into a calibrated one, while the pressure in the measuring capacity and the pressure difference between the capacities before reverse transfer are maintained equal to the pressure in the calibrated capacity and the pressure difference between the capacities before the direct bypass, and the determination of the desired value is carried out according to the formula / (Р-РХР-Р) V ,, P.P, J () gVeV, Jm, Vk - Volumes of the measured and calibrated containers; RK t PMJH pressure in calibrated and measured capacitances before the direct bypass P - the steady-state pressure in the system after the direct pe, repusk; RC / PMSKT pressure in calibrated and measured containers before reverse transfer; steady-state pressure in the system after the reverse bypass. Sources of information taken into account in the examination 1. The author's certificate of the USSR 210408, cl. G 01 F 17/00, 1968. 2. USSR author's certificate number 152078, cl. G 01 F 17/00, 1962 (prototype) t