SU1377588A1 - Apparatus for automatic metering of liquids - Google Patents

Abstract

The invention relates to instrumentation. The purpose of the invention is to improve the accuracy of measuring the dose volume and its speed. expiration After switching on through the button: 14 polarized relay 15, the normally open valve 6 is closed. After opening the normally closed valve 9, the liquid level in the measuring tank 5 will decrease. The output signal of the differential pressure sensor 10 will vary in proportion to the difference in the level of the liquid pillars in measuring capacitances 4 and 5. The signal of the differential sensor 10 is fed to the input of the flow velocity measurement unit 11 and the input of the threshold element 13. After the signal is differentiated in the flow velocity measurement unit 11 a signal equal to the speed value is fed to the scoreboard, and the signal received at the input of the threshold element 13 is compared with a predetermined, proportional to the volume of a given portion or the maximum liquid level bones in measuring container 4, specified within the constant section of measuring containers 4 and 5. 2 hp, f-crystals, 1 sludge. (L

Description

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This invention relates to instrumentation engineering, in particular, to devices for automatic dosing of liquids.

The aim of the invention is to improve the accuracy of measuring the volume of the dose and the rate of its expiration.

The drawing shows a diagram of the device.

A device for the automatic dosing of liquids contains a filling container 1, a liquid supply unit 2, a measurement unit 3 containing two measuring tanks 4 and 5 equal in section and volume, a normally open stop valve 6, an inlet 7 and an outlet 8 pipelines , normally closed valve 9, differential pressure sensor 10.

The device also includes control equipment 11, which includes a flow rate measurement unit 12, a threshold element 13, a switch-on button 14 and a polarized relay 15. The measured phase capacitance is connected to the atmosphere through valve 16 by means of a valve.

The device works as follows.

Compressed air is directed to the liquid supply unit 2, from where it enters the supply tank 1, the liquid is displaced through line 7 through the normally open valve 6 and the previously opened normally closed valve 9 to the output line 8, after filling the pipelines 7 and - 8 open valve & and the normally closed valve 9 is closed, the liquid fills the measuring tank 4, the gas is expelled from the upper part of the measuring tank 4 into the measuring tank 5. After filling the measuring tank 4, the flow of liquid from the feed tank is stopped, the normally open valve 6 is opened, and the valve is closed normally valve 9 is closed, fluid levels are set equal in height to the associated measuring containers. The valve 16 is then opened. The preparatory stage is now complete. In both chambers of the differential sensor 10, the same pressure is set, and the sensor output signal is equal to ...

The operation of the device in automatic mode is carried out by switching on via button 14, polarized, t-

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The relay relay 15, which closes the normally open valve 6, while after the normally closed valve 9 is opened, the liquid level in the measuring tank 5 will decrease. The output signal of the differential pressure sensor 10 will change in proportion to the difference between the pillars of the liquid in the measuring capacitors 4 and 5. The signal of the differential pressure sensor 10 is fed to the input of the flow rate measurement unit 11 and to the input of the threshold element 13. After differentiating the signal in the flow velocity measuring unit, a signal equal to the speed value enters the display not shown, and the signal received at the input of the threshold element 13 is compared with a task proportional to the volume of a given portion (batch dosing mode) or the maximum liquid level in the measuring tank 4 (continuous dosing mode or calculating the outflow rate specified This section of measuring containers 4 and 5.

After reaching a predetermined level, the threshold element 13 switches the polarized relay 15, and it turns off, the valve 6 is normally open, and the measurement cycle is repeated again. When dispensing a liquid, the value of the specified portion is set in the threshold element 13. After pressing button 14, the normally open valve 6 closes, and the normally closed valve 9 opens as soon as the level difference in the measuring cylinders 4 and 5 reaches the specified value, the threshold device through a polarized relay 15 Toggles the valves 6 and 9 to their original position. The dosing cycle can be repeated by an external command,;

Pho. rmula of invention

Claims (1)

1, A device for automatic dosing of liquids, which contains a consumable tank, a fluid supply unit, a control unit and a measuring unit, including two identical measuring tanks interconnected by gas cavities directly, and a liquid one through a normally open valve and supplying and outlet pipelines, characterized in that, for the purpose of 513775886 increase the accuracy of measurement of the volume of fluid, connected to the output of the differential dose and its rate of expiration, block differential pressure sensor, and measurement is made in the form of a differential-output unit for measuring the flow of a connecting pressure sensor, each of them through a relay with drives normally the measurement input of which is connected to the open and normally closed class by the output of the corresponding measuring pan, the capacitance, and the output of the differential 3. The device according to the PL and L and the pressure sensor is connected to the input so that it is supplied with control equipment. . d female normally closed valve 2, The device according to claim 1, about tl and -installed at the output of the measuring capacitance so that the apparatus and connected to the equipment The control tour is equipped with an inverse-poisoning unit with a normally measured flow rate of a valve being opened.