SU1187154A1 - Multichannel temperature controller - Google Patents

Abstract

1. MULTI-CHANNEL TEMPERATURE REGULATOR, containing regulating bodies installed in the respective supply lines of the regulating medium into the units and connected to the outputs of the corresponding programmed time relays, temperature sensors installed at the output of the units and connected to the input of the multipoint regulating device, so that that, in order to increase the control accuracy, they are introduced according to the number of control channels of the circuit, each of which contains two elements AND, a unit of electrocontact sensors, the first element NT OR, a pulse counter and a control pulse shaping unit, in each control channel the first and second inputs of the control pulse formation unit are connected to the corresponding outputs of this channel of a point-controlled regulating device, and the third and fourth inputs are connected to the outputs of the first and second elements, respectively And to the corresponding inputs of the software time relay, the first inputs of the AND elements are connected to the output of the first element OR, to the reset input of the pulse counter, and the second inputs of the elements And they are connected respectively to the first and second outputs of the control pulse shaping unit, the third and fourth outputs of which are connected to the first inputs of the pulse counter and the first RSHI element, the second input of which is connected to the output of the pulse counter, the second input of which is connected to the output of the corresponding contact sensor unit installed on the supply lines of the regulating i medium in the aggregates. 2, Regulator POP.1, characterized in that the control pulse shaping unit contains the third and fourth elements AND, the second and third OR elements and four triggers, the R-input of the first trigger connected to the 5-input of the third and the R-input of the fourth flip-flops to the first input of the SECOND element OR and -J is the first input of the control pulse formation unit, the second 1/1 input of which is connected to the zero R input of the third trigger, 5 input of the first and R input of the second trigger connected to the second input of the second element OR, the output is This is the third output of the control pulse shaping unit, the fourth output of which is the input of the third OR element connected by its inputs to the outputs of the third and fourth elements AND, respectively, the first inputs of which are connected to the single outputs of the second and fourth triggers respectively, the second inputs of the third and fourth the fourth

Description

And elements are connected to the outputs of the first and third triggers, respectively, and are respectively the first and second outputs of the control pulse shaping unit, TJIGs and the fourth inputs of which are connected to the 5 inputs of the second and fourth triggers respectively.

one

The invention relates to aeromatics and can be used to control and regulate the temperature of concurrently operating process units in the chemical, food and other sectors of the national economy.

The purpose of the invention is to increase the accuracy of regulation.

FIG. 1 is a block diagram of the device; in fig. 2 is a block diagram of a first control pulse generation unit.

The DEVICE contains (FIG. 1) sensors 1 ,,. .., IN reagent temperatures (. For example, used in a potash processing plant) installed at the outlets of containers,.,. connected to the inputs of a multipoint control device 3.

In each control channel, block 4, 424 | (formation

the control pulse, the first and second inputs of which are connected to the corresponding output of the multipoint control device 3, the third and fourth outputs of the block are connected respectively to the first inputs of the counter 5; (- 5m pulses and the first element OR 6, -6 and the second input of which is connected to the output counter) i | pulses, the output of the element OR 6j-6 is connected to the first inputs of the first and second elements And And And connected to the reset input of the pulse counter, the second inputs of the elements And And And 8, -vz are connected to the first and second outputs of the block, the third and fourth inputs of which connected respectively to the outputs of the elements And 7.-7. and And connected to the corresponding inputs of the block of software relays 9, ..., 9),) the time, the outputs of which are connected to the appropriate regulatory bodies established in

corresponding lines of supply of the regulatory environment 11 (-Pts.

The second inputs of the Pulse counter are connected to the outputs of the corresponding blocks 12.-12f, electrocontact manometers installed on the supply lines of the regulating medium.

Each of the control pulse formation units 4 (Fig. 2) contains triggers: the first 13, the second 14 the third 15 and the fourth 16, the third element AND 17, the fourth element AND 18 and the elements OR - the second 19 and the third 20.

The device works as follows.

Before starting the device, the operator at block 3 sets the set values of the temperature of the reactants at the output of the containers 2. With the help of a software time relay, the operator sets the time of the control pulse action on the executive mechanisms, which is determined during the adjustment according to the required control accuracy.

In the initial state, at the outputs of the flip-flops 13 and 15 and the flip-flops 14 and 16, there is a logical zero and a logical one, respectively.

The signal from the sensor 1 of the temperature of the reagents installed at the output of the containers 24, in each cycle of running around tp, is fed to the input of the multipoint device 3, where it is compared with the setpoint temperature and the signal goes to the first control channel, in particular at the first or second input (in depending on the mismatch sign) of the first control pulse formation unit 4.

The operation of block 4 (Fig. 2) is as follows.

3

When a signal appears at the first input of block 4 ,, it is fed to the R input of the flip-flops 13 and 16, to the 5-input of the flip-flop 15 and to the input of the OR element 20, the output of which is a signal that is fed to the third output of the block 4. At the output of the flip-flops 15 and 16, respectively, there is a logical one and a logical zero, and at the output of the flip-flop 13 a logical one appears, which is simultaneously fed to the first output of the block 4y and to the second input of the element 17, at the first input of which from the trigger 14 is logical unit, so that at the output of the element And 17 A logical unit is transmitted through the element OR 19 to the fourth output of block 4 (from which a signal is fed to the input of the element OR 6 (Fig. 1). At the output of the element OR 6, a signal appears that is fed to the first input of the elements Both 7, 8, and the reset input of the pulse counter 5, resulting in a pulse counter being reset to its original position, because the second input of the element And 7 | the output element And 7 there is a signal that simultaneously is fed to the third input of block 4 , and to the input of the corresponding software relay 9 time. A time relay is triggered and the signal is fed to the input of the appropriate regulatory authority 10, which changes the supply of water vapor (control medium) to tank 2. Simultaneously, at the fourth exit of block 4 | the signal disappears due to the signal from the element And 7, to the input of the trigger 14 (figure 2)

When a second signal appears at the first input of block 4 (Fig. 2), it is also fed through the OR element 20 to the third output of block 4j, to the private network at the input of the counter 5 | pulse (Fig. 1), to the R input of the flip-flops 13 and 16 and to the 5-input of the trigger 15. At the output of the element And 17, the signal does not appear due to the absence of the trigger 14 of the logical unit at the output of the trigger. This trigger, after the formation of the first control pulse, is brought to the zero state and is in this position until the second

the input of block 4 does not appear.

At the output of the counter 5 | no pulses appear until the number of pulses is equal to the value of M of the run around set on it. If, for example, the output of the pulse counter, as well as the output of the And 7 element, will pass only the impulse of every fourth run-around cycle.

The pulse counter is reset to the initial state by the signal at the output of the element OR 6. When changing the pressure of water vapor using the electric manometer 12, the pulse counter 5 is adjusted, thereby changing the ratio M of the run-around cycle. As the vapor pressure increases, the multiplicity M of the run-up cycle increases, as a result of which the frequency of the control pulse decreases, and as the pressure decreases, the frequency of the control increases: therefore, the control pulse increases. This makes it possible to improve the quality of regulation without the use of local systems for regulating the pressure of the water vapor that is included in the apparatus.

If a signal appears at the second input of block 4j, this signal is applied to the 5th input of the trigger 13, to the R inputs of the flip-flops 14 and 15 and brings them to the zero and one states, respectively. The signal, which appeared at the second output of block 4, triggers trigger 15 into a single unit. In this case, at the output of the trigger 15 a logical unit appears, which is fed to the input of the element And 18, on. the second input of which is supplied the logical unit from the trigger 16. Then at the output of AND 18 appears from the unit through the element OR 19 is fed to the fourth output of block 4 | . At the same time, the signal from the second input of block 4 is fed through the OR 20 element to the third output of block 4. From trigger 15, the signal is fed to the second output of block 4 | and, therefore, to the second input element And 8j. From the fourth output of block 4, the signal is fed through the element OR 6 (to the first inputs of the elements 7 and 8, ensuring the passage of the control pulse through the element 8 to the corresponding program time relay 9 acting on the regulator 10 in the other direction for a time t.

At the same time, the signal produced at the output of the element OR 6, brings the pulse counter 5 to the zero state. The other channels of the regulation system work in the same way.

Compared with the known, the proposed device has the ability to increase the control accuracy on average 1.5 times due to automatic adjustment of the period (frequency of the run-around cycle) of control pulses at the time of changing the pressure (temperature) of the regulating medium, forming the first control pulse when the error sign changes and other positive pulses with the multiplicity of the time of the run-around cycle, as well as the possibility of controlling objects with different inertia and time audio to lag time constant.

Claims (2)

1. A MULTI-CHANNEL TEMPERATURE REGULATOR containing regulating bodies installed in the corresponding supply lines of the regulating medium to the units and connected to the outputs of the corresponding program time relays, temperature sensors installed at the output of the units and connected to the input of the multi-point control device, resulting in that , in order to increase the accuracy of regulation, introduced according to the number of channels for regulating the circuit, each of which contains two AND elements, a block of electrical contact sensors, the first OR element, a pulse counter and a control pulse generating unit, and in each control channel, the first and second inputs of the control pulse generating unit are connected to the corresponding outputs of this channel of a multi-point control device, and the third and fourth inputs are connected to the outputs of the first and second elements And, respectively, and to the corresponding the inputs of the software timer, the first inputs of the AND elements are connected to the output of the first OR element, to the reset input of the pulse counter, and the second inputs of the AND elements are connected respectively, to the first and second outputs of the control pulse generation unit, the third and fourth outputs of which are connected to the first inputs of the pulse counter and the first OR element, the second input of which is connected to the output of the pulse counter, the second input of which is connected to the output of the corresponding block of electrical contact sensors, installed on the supply lines of the regulatory environment in the units. 2, The controller according to claim 1, characterized in that the control pulse generating unit comprises a third and fourth AND element, a second and third OR element, and four triggers, the R input of the first trigger is connected to the S input of the third and R input of the fourth trigger, to the first input of the second OR element and is the first input of the control pulse generation block, the second input of which is connected to the zero R-input of the third trigger, the 5-input of the first and R-input of the second triggers connected to the second input of the second OR, the output of which is t the third output of the control pulse generation unit, the fourth output of which is the output of the third OR element, connected by its inputs to the outputs of the third and fourth AND elements, the first inputs of which are connected to the unit outputs of the second and fourth triggers, respectively, the second inputs of the third and fourth 1.187154 AND gates connected to outputs of the first and third flip-flops and are respectively first and second block outputs of forming of a control pulse, the third and fourth inputs of which are sub-keys ^1, respectively, to 5-second inputs, and a fourth flip-flops.