RU2069317C1 - Process of measurement of geometric parameters of vessel and device for its realization - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: vessel is filled with exemplary liquid with known physical properties through volumetric counter. Filling is carried out with rate providing for mixing of liquid. Temperature of surface of liquid and its level are measured and geometric parameters (area of geometric section and volume) of undistorted and distorted vessel with any level of its filled part are calculated. EFFECT: enhanced authenticity of method. 1 dwg

Description

 The invention relates to measuring technique and is intended for measuring the geometric parameters of containers used to store liquid products.

 A known method of calibrating tanks [1] by successive discrete filling of the tank with liquid through a volume meter, measuring the liquid level and calculating the volume of a portion of the liquid before loading into the tank. This method is characterized by narrow functionality, which consists in determining only the volume of the loaded portion of the liquid, depending on the level of the same portion in the working part of the tank.

 The closest in technical essence to the claimed method for measuring the geometric parameters of the capacity is a method for calibrating capillaries made of transparent glass, including filling the capillary with a liquid with a known volume and coefficient of volume expansion, measuring the height of the liquid column and calculating the horizontal cross-sectional area of the working part of the capillary at various values of the liquid temperature [ 2] In this method, expanded functionality is calculated and the horizontal sectional area of the completed work is calculated s part of the capillary.

 However, in the method [2] for measuring the horizontal cross-sectional area at various levels, the entire liquid is heated to the specified temperature values, which requires a large amount of time and material costs when determining the parameters of large tanks. Over a long heating time in large tanks, the temperature of the liquid is distributed at different levels in the filled working part unevenly, which leads to large errors in calculating the geometric dimensions, because uneven temperature distribution and uneven thermal expansion of the vessel body is difficult to consider.

 Another significant drawback is the measurement of parameters of only non-deformable containers, without taking into account the impact on them of operating conditions.

 The closest in technical essence to the claimed device for measuring the geometric parameters of the tank is a device for calibrating tanks containing a computing unit, the first input of which serves to set the operating modes of the device, and the first output is the output of the device, a switch, the first input of which is connected to a power source, and the outlet with the second input of the fluid supply device, the first input and output of which through the pipelines are connected respectively to the source of the reference fluid and to the input the house of the liquid quantity meter, the second output of which is connected to the second input of the computing unit, and the first output through the pipeline is connected to the lower part of the tank, which houses the level sensor connected to the third input of the computing unit (1).

 This device is fully automated, characterized by increased accuracy and speed of calibration of tanks. However, the device (1) is also characterized by narrow functional capabilities, due to the determination of only the volume of a portion of the sample fluid before loading into the tank. This device does not account for possible deformations of the container body. The device (1) is also characterized by excessive material costs. The main reason for the disadvantages of the device is the selected method for determining geometric parameters.

 The technical result created by the inventions is the expansion of functionality by measuring the geometric parameters of the undeformed and deformed capacities in real operating conditions, as well as improving the accuracy by taking into account the effects of all factors causing deformation of the container body.

 To achieve this result, the tank is filled with an exemplary liquid with a known coefficient of volumetric thermal expansion and a coefficient of volumetric compression under pressure through a liquid quantity counter to a predetermined level at a speed that ensures mixing of the liquid loaded into the vessel, the filling process is interrupted, the level and temperature of the liquid mirror are measured, and geometric parameters corresponding to the deformed and undeformed states of the tank resume the filling process eniya and continue measuring geometric parameters of the container to a predetermined upper level.

 To implement the method can be used a device for measuring the geometric parameters of the tank, a block diagram of which is shown in the drawing.

 The device contains a computing unit 1, the first input and output of which are respectively the control input and output of the device, switch 2, the first and second inputs of which are connected respectively to the power source and to the second output of computing unit 1, and the output of switch 2 is connected to the second input of the feeder fluid 3 (CLC), the first inlet and outlet of which through pipelines are connected respectively to a source of reference fluid and a fluid quantity counter 4 (SCC) whose second outlet is connected to the second at the input of the computing unit 1, and the first exit through the pipeline is connected to the filling hole made in the lower part of the tank 5 being verified, the outputs of the level sensor 6 and the temperature sensor 7, located in the tank on the liquid surface, are connected to the third and fourth inputs of the computing unit 1.

 The method is as follows.

, на которых нужно вычислить геометрические параметры в процессе заполнения.Initially, using the first input of the computing unit 1, input data is entered:
capacity design data;
reference fluid information;
tank operating conditions
and set the levels

on which you need to calculate the geometric parameters during the filling process.

. Определив этот факт, на втором выходе вычислительного блока 1 устанавливают сигнал, который переводит переключатель коммутатора 2 в исходное положение, и, тем самым, прерывают перекачивание жидкости. Обрабатывая показания СКЖ 4 вычисляют количество загруженной жидкости, измеряют уровень H_i и температуру зеркала жидкости по показаниям, которые поступают на третий и четвертый входы вычислительного блока 1 от датчиков соответственно уровня 6 и температуры 7. Вычисляют геометрические параметры, соответствующие деформированному и недеформированному состояниям емкости. Определяют величину площади s_o(h) горизонтального сечения недеформированной емкости на уровне h (0<h≅H_i)

(1)
где M_i=M(H_i) масса загруженной до уровня H_i жидкости;
ρ(H_j) плотность жидкости на высоте H_j при уровне H_i и температуре t_i зеркала жидкости;
α(H_j) коэффициент линейной деформации корпуса емкости на высоте H_j при уровне H_i и температуре t_i зеркала жидкости.Then, through the first input of the computing unit 1, a command is issued to begin the process of filling the capacitance, according to which a signal is installed at the second output of the computing unit 1, which switches the switch of the switch 2 from its initial position to the position that connects the power source to the second input of the UPZ 3, which starts pumping sample liquid into the tank through SCF 4 at such a rate that the liquid in the tank mixes. Through the third input of the computing unit 1, the readings of the level 6 sensor are received and processed, and so on until the liquid surface reaches a predetermined level

. Having determined this fact, at the second output of the computing unit 1, a signal is set that transfers the switch of the switch 2 to its original position, and thereby interrupt the pumping of liquid. Processing the readings of SKZh 4, the amount of loaded liquid is calculated, the level of H _i and the temperature of the mirror of the liquid are measured according to the readings received at the third and fourth inputs of the computing unit 1 from the sensors of level 6 and temperature 7, respectively. The geometric parameters corresponding to the deformed and undeformed states of the tank are calculated. The value of the area s _o (h) of the horizontal section of the undeformed capacity is determined at the level h (0 <h iH _i )

(one)
where M _i = M (H _i ) is the mass of the liquid loaded to the level of H _i ;
ρ (H _j ) the density of the liquid at a height of H _j at the level of H _i and the temperature t _{i of the} liquid mirror;
α (H _j ) is the coefficient of linear deformation of the container body at a height of H _j at the level of H _i and the temperature t _{i of the} liquid mirror.

Затем вычисляют величины S(H_i)
s(h)=(1+α(h))²s_o(h). (2)
На основе полученных данных вычисляют объемы V_o(h) и V(h) рабочей части соответственно недеформированной и деформированной емкости. Затем на втором выходе вычислительного блока 1 устанавливают сигнал, который переводит переключатель коммутатора 2 в положение, обеспечивающее возобновление перекачивания жидкости в емкость. Заполняют емкость таким образом до заданного верхнего уровня

Определяют геометрические параметры (S_o, S(h), V_o(h), V(h)), соответствующие деформированному и недеформированному состояниям емкости

о

Then calculate the values of S (H _i )
s (h) = (1 + α (h)) ² s _o (h). (2)
Based on the data obtained, the volumes V _o (h) and V (h) of the working part of the undeformed and deformed capacity, respectively, are calculated. Then, at the second output of the computing unit 1, a signal is set, which puts the switch of the switch 2 in a position that ensures the resumption of pumping liquid into the tank. Fill the container in this way to a predetermined upper level.

The geometric parameters (S _o , S (h), V _o (h), V (h)) corresponding to the deformed and undeformed states of the capacitance are determined

about

Claims (2)

 1. The method of measuring the geometric parameters of the tank, which consists in the fact that the tank is filled with a liquid with a known coefficient of volumetric thermal expansion, measure the level of the mirror of the liquid, calculate the horizontal cross-sectional area of the working part of the tank, characterized in that they use a sample liquid with a known coefficient of volumetric compression under pressure , the tank is filled to a predetermined level at a speed that ensures mixing of the liquid in the tank, interrupt the fluid supply, measure the temperature of the mirror liquid, calculate the geometric parameters of the undeformed and deformed tanks, resume filling the tank and continue measuring the geometric parameters of the tank to a predetermined upper level.  2. A device for measuring the geometric parameters of capacity, containing a computing unit, the first input and output of which are respectively the control input and output of the device, a switch, the first input of which is connected to a power source, and the output to the second input of the fluid supply device, the first input and output of which connected through pipelines, respectively, to the source of the reference fluid and the input of the counter of the amount of fluid, the second output of which is connected to the second input of the computing unit, to the third input to the output of the level sensor located in the tank on the surface of the liquid is plugged in, while the first output of the liquid quantity counter through the pipeline is connected to a filling hole made in the lower part of the tank, characterized in that a temperature sensor is connected to it and connected to the fourth input of the computing unit, the second output of which is connected to the second input of the switch, while the temperature sensor is located in the tank on the surface of the liquid.