SU1151831A1 - Device for indicating level of boiling liquids - Google Patents

Abstract

A DEVICE FOR INDICATING A LEVEL OF A BOILING LIQUID, containing an electrode connected to an output of a direct current source, a clock pulse generator, and an actuator, characterized in that, in order to improve the accuracy, the first driver sequentially connected to it is entered, delay it, the frequency divider by N -1, the second driver, the first one-shot, the third driver, as well as the element And, the electronic key, the counter-divider for N pulses, ND-triggers, N-input element And, and the element And the first input Connected to the output of the first imager, the second input via an electronic key to the output of the DC source, and output to the clock input of the counter-divider for N pulses, the reset input of which is connected to the output of the third imager, and the information outputs to the information inputs of the corresponding D - trigger, clock inputs U -trig (I gerov combined at the output of the second driver, and the outputs are connected to the inputs of the N-input element And, the output of which is connected to the actuator. ate 00 & d

Description

The invention relates to the technique of control and automatic control and can be used in systems for automatic control of the level of boiling liquids, in particular in chemical technology apparatuses.

A device for detecting a level is known, which contains several electrodes located vertically. Each electrode is connected to its direct current source and, in contact with the upper edge of the foam, forms a closed circuit. The outputs of all sources are related to a current-voltage converter, in which the summation of individual current values and their averaging over time is carried out. The total current value is used to indicate the total number of electrodes that are in contact with the foam. The averaging of the particular current values serves to indicate the average level of the foam lj.

The drawbacks of the device are low reliability and accuracy of recording the level of boiling liquid.

The closest in technical essence to the present invention is a device for measuring a liquid, comprising a measuring needle, a pulse shaper, a tracking trigger, a modulator, a clock pulse generator, and a readout node iZJ.

Devices. 0 is intended for objective reading of the level of a liquid with a highly oscillating surface, as well as in non-stationary flows.

A disadvantage of the known device is that with its help it is difficult to accurately fix and reliably regulate the level of boiling liquids.

 The purpose of the invention is to improve the accuracy of fixing the level of boiling liquid.

This goal is achieved by the fact that a device for indicating the level of boiling liquid, containing an electrode connected to the output of a DC source, a clock pulse generator and an actuator, is inserted. serially connected first driver, delay lines, frequency divider by I -1, second driver, first one-shot,

the third driver, and the element And, electronic key, counter-divider for N pulses, tJD-triggers, M-input element And, the element And the first input is connected to the output of the first driver by the second input through an electronic switch to the output of the DC source and the output to the clock input of the counter-divider for M pulses, the reset input of which is connected to the third generator, and the information outputs to the information inputs of the corresponding D-trigger, the clock inputs of the D-trigger, are combined at the output of the second form Ate | l, and the outputs are connected to the inputs and, the-input element, And, the output of which is connected to the executable device.

The drawing shows a block diagram of the proposed device.

The device for indicating the level of boiling fluid consists of an electrode 1 connected to a source of 2 constant currents and an input of an electronic switch 3, a generator of 4 clock im-, pulses, the first driver 5 short pulses, the first element I 6, a delay line 7 of frequency divider 8 on (N-1), the second pulse shaper 9 along the slice, the one-shot 10, expanding the pulse, the third slider shaper 11 along the slice, the splitter counter 12 by N, D -triggers 13-16, the second N-input element And 17 and the executive devices 18.

The device works in the following way.

The pulses from the 4-clock pulse generator arrive at the shaper of 5 short pulses, from whose output the short pulses through the delay line 7 are fed to the input of the frequency divider 8 (N-1), which serves to set the device's duty cycle. After entering the divider 8 the frequency (Nt) of the pulse, it is reset to zero. At the same time, using the second pulse shaper 9, a pulse is formed over the slice, when it arrives at the clock inputs of the B-triggers, the information from the counter-divider 12 is rewritten into D-Trigg3

13-16. At the same time, a pulse from the first pulse generator 9 triggers a single vibrator 10, from the output of which the diffused pulse arrives at the second pulse shaper 11 in a slice, the output pulse of which arrives at the input of setting the zero of the counter divider 12, the latter is set to zero. After that, the duty cycle is repeated.

With the open state of the electrode 1, the logical zero level is formed at the output of the key 3. In this case, the AND 6 element does not transmit pulses to the counting input of counter splitter 12, and therefore at all its outputs a level of logical zeros is formed, which at the end of the working cycle will be overwritten) by triggers 13-16, the outputs of which also form levels of logical zeros. As a result, at the output of the second element And 17, for example, a level of a logical unit is formed, indicating that the level is. Shdkost in a controlled amount below normal. In this case, the signal from the output of the second element I 17 is fed to the actuating device 18, with the help of which, for example, the filling of the controlled volume with liquid is carried out, if the level stabilization system works for filling. . .

When the electrode 1 is closed on the liquid at the output of the electronic key 3, the level of the logical unit is formed and the first element 6 begins to transmit pulses from the output of the generator 5 to the counting input of the divider counter 12. When the electrode 1 is closed on the liquid randomly

S18314

way (during boiling), then during the working time of the counter-depot meter 12, there are less pulses than (N -1), and therefore at least one of its 5 outputs will have a logical zero level, and therefore, at the output of the second element, And 17 there will still be a level of logical units, and in doing so.

The fO volume filling with liquid will continue.

When the liquid in the volume reaches such a level at which electrode 1 is permanently closed on the fluid, the counter input of counter separator 12 will receive (W -1) pulses during the operating cycle, and it will be completely filled and therefore all its outputs will form

20 levels of logical units. At the end of the work cycle, the information from the divider counter 12 will be rewritten to the D triggers 13-16, and the divider counter will be reset to zero. Then

25, the duty cycle is repeated. At the output of the second element And 17 a level of logical calls is formed, indicating the filling of the volume of liquid to a predetermined level. At the same time, with the power of the actuator 18, the supply of liquid to the volume is stopped by the power of the actuator 18.

Thus, when regulating

and indication of the level of boiling liquid

five -

The proposed device eliminates false alarms, since random bursts do not affect the level indication and the generation of the control signal by actuators, which greatly affects the reliability of the control system as a whole.

Claims (1)

DEVICE FOR INDICATING A BOILING LIQUID LEVEL, containing an electrode connected to the output of a direct current source, a clock pulse generator and an actuator, characterized in that, in order to improve accuracy, the first former, a delay line, a frequency divider by N - are introduced into it 1, the second driver, the first one-shot, the third driver, and the And element, an electronic key, a counter-divider by N pulses, ND triggers, N-input element And, and the And element is connected to the first input it is connected to the output of the first driver, the second input through the electronic key to the output of the DC source, and the output to the clock input of the counter-divider for N pulses, the reset input of which is connected to the output of the third driver, and the information outputs - with the information inputs of the corresponding D-trigger , the clock inputs of the D-triggers are combined at the output of the second driver, and the outputs are connected to the inputs of the N-input element And, the output of which is connected to the actuator. 1 1151831 ϊ