SU1642241A1 - Measurer for liquid quantity in a tank - Google Patents

Abstract

The invention relates to a measuring and control technique, namely, devices for measuring the amount of liquid in containers. The aim of the invention is to increase the reliability and the expansion of the field of application. When the hydraulic channel 2 is open, the fluid moves from the vessel 3 to the measuring tube 5. After the fluid is in equilibrium, the channel 2 closes, the micro-electric motor 12 turns on and the piston 7 starts to move, and its movement is recorded in the pulse counter. The piston movement corresponds to the lifting of a liquid column in the measuring tube 5. 1 sludge.

Description

3467/3

The invention relates to a measuring and control technique, namely, devices for recording the amount of liquid in tanks, and can be used, in particular, to measure and control the amount of oil in tank farms of oil depots and nuclear power plants.

The aim of the invention is to increase the reliability and the expansion of the field of application.

The drawing schematically shows the proposed device.

A vessel 3 is connected to the tank 1, in which the measured liquid is contained, through the electromagnetic hydraulic channel 2. The vessel 3 is partially filled with a liquid whose density is close to the density measured. For example, if the measured liquid is an oil product, then a 35% ethylene glycol solution (antifreeze) can be used as the liquid in the vessel. With other measured explosion-proof liquids, there is no need to install vessel 3. Vessel 3 is hydraulically connected to pressure sensor 4, consisting of measuring tube 5 and cylinder 6 with movable piston 7, fixed electrical contact is installed in measuring tube 5 above the maximum liquid level in the tank 8, electrically connected to the pulse counter 9. The piston 7 is moved using a micro electric motor with a gear 13.

A slit sensor 10 with a phototransducer 11 is mounted on the motor shaft, which converts any movement of the piston 7 into electrical signals. The pulse counter 9 summarizes the electrical signals from the photoconverter 11, and the integrator 12, according to the counter, reads the mass of fluid in the tank.

The device works as follows.

The electromagnetic hydraulic channel 2 opens and the controlled reservoir is connected to the intermediate vessel 3. The liquid begins to move from the vessel 3 to the measuring tube 5 or in the opposite direction. After some estimated time, the liquid level in the measuring tube 5 is established, after equilibration is established, the electromagnetic hydraulic communication channel 2 is closed and the microelectric motor 12 is turned on and the piston 7 begins to move in the cylinder 6.

a photoconverter 11. Liquid from the cavity of the hydraulic cylinder enters the measuring tube 5, since the entrances to the controlled reservoirs are closed. The displacement of the piston AX corresponds to the lifting of the liquid column hx in the measuring tube 5 and the indication of the pulse counter NI. When the liquid level touches the electric contact, the electrical channel closes.

connection with the photoconverter 11 and the pulse counter reading is recorded. According to the meter reading, the hydrostatic pressure of the liquid column in the tank is determined.

 K (No-Ni), (1)

gross density of the intermediate fluid;

No - indication of the pulse counter at the minimum level of liquid in the tank;

NI - the same, with the current level of fluid in the tank;

K is the price of a single impulse.

The density of the intermediate fluid / e, depending on the temperature, is known and remains constant, since the time of one measurement is (60 - 90) s. During this time, the temperature (density) remains constant, as the liquid in the measuring tube is injected from the same container.

Having a hydrostatic pressure, is determined by the mass of fluid in the tank.

M | Scp, (2)

where SCp is the averaged cross-sectional area of the tank.

The device also allows determination of the inflow and mass flow rate of the fluid.

The proposed device serves

tank system. In order to ensure the necessary efficiency, the number of tanks is recommended to limit detyo.

The absolute measurement error in the measuring tube ± A h depends on the absolute measurement error of the displacement of the piston ± A I and is determined by the formula

TO

± Dub ± D |, (4)

/ d where D is the diameter of the piston;

d is the diameter of the measuring tube.

Formula of the invention. A device for measuring the amount of liquid in containers, comprising a measuring tube with an electrode installed in it and communicating via

a separating vessel with a capacity of counters by a separating vessel, wherein the porregistration of information, which is different, is equipped with a displacement sensor, in order to increase reliably with the input of the counter, the output of which

In order to expand and expand the field of application, it is connected to the integrator, and in the separator equipped with a movable piston, the hydraulic-5 vessel is intermediate electrically connected to the measuring tube and the conducting fluid.

Claims (1)

A device for measuring the amount of liquid in containers, containing a measuring tube with an electrode installed in it and communicating through an isolating vessel with a container, an information recording counter, characterized in that, in order to increase reliability and expand the scope, it is equipped with a movable piston hydraulically connected with a measuring tube and a separation vessel, while the piston is equipped with a displacement sensor associated with the input of the counter, the output of which is connected to the integrator, and in the separation with oud is an intermediate electrically conductive liquid. Compiled by T. Sergeeva Editor Y. Sereda Tehred M. Morgenthal Corrector S. Czerny