SU1619230A2 - Pneumatic controller - Google Patents

Abstract

The invention relates to instrumentation, namely to pneumatic devices for adjusting the technological parameters of temperature pressure, etc., and is an improvement to the pneumatic controller according to the author. St. bfc 10404Г6. The purpose of the invention is to expand the functionality and improve the accuracy of the controller. In the controller is installed lo

Description

The invention relates to instrumentation, namely, to pneumatic control devices for technological parameters: pressure, temperature, humidity, etc., and is an improvement to the pneumatic controller according to the author. St. Nr ° 1040466

The purpose of the invention is to expand the functionality and improve the accuracy of the controller.

The drawing shows the principal pneumatic diagram of the regulator.

The regulator contains an adder 1, a variable choke 2, a first switching relay 3, a capacitance 4, forming an integral link, a constant choke 5, a third switching relay 6, repeaters 7 and 8 with a shift, forming a two-pole source of linearly varying the signal is proportional to the link 9, the indicator 10 of the zone, consisting of elements 11 and 12 of the comparison, setters 13 and 14 of the upper Pg and lower Rc levels of indication — levels of limitation of the output signal of the P6blv regulator (border of the insensitivity zone of the regulator), fourth 15 and p addition 16 relay re switches, the second switching relay 17, the pneumatic button 18, the logic element OR i9, and the pneumatic switch 20 to three positions: Larger, Smaller and average (neutral).

The minus and first positive chambers of the adder 1 are connected to the channels of the variable RP variable and the driver, P, P, and the second positive chamber are connected to the first and second inputs of the proportional link 9. The output of the proportional link 9 ROUND is connected to

plus chambers of elements 11 and 12 comparing zone indicator 10 and the normally open nozzle of the second switching relay 1, the normally closed socket of which is connected to the channel

five

0

5 0 0 5

0

five

tantal (manual) control Ritsts. The output of the relay 17 is connected to the output channel of the regulator ROME (pressure on the actuator) .. The output of the adder 1 is connected via a variable choke 2 with the normally open nozzle of the first relay 3 switching- 1. The output of the relay 3 is connected to the tank 4, the positive chamber of the adder 1 and the inputs of the repeaters 7 and 8 with a shift. The output of the repeater 7 with a shift is connected to the normally closed nozzle of the third switching relay 6, the normally open nozzle of which is connected to the output of the repeater 8 with a shift. The output of relay 6 is constant, the throttle 5 is connected to the normally closed nozzle of the first relay 3. The output P of the zone indicator 10 is connected to one input of the OR 19, the other input of which is connected to the first correction channel, and the output of the element 19 is connected with the control camera of the first relay 3, the output Pj, n of the first comparison element 11 in the zone indicator — with the upper nozzle of the second comparison element 12 and the control camera of the third relay 6. The lower nozzle of the first comparison element 11 is connected to the second correction channel P,; 0pz . The correction signals of the channels P and PCO are removed from the outputs of the pneumatic switch 20, the output of the switch 20 is connected to the power channel.

The minus chamber of the comparison element 11 is connected to the output of the fourth switching relay 15, the normally open nozzle of which is connected to the output of the setpoint 13 of the upper limiting level RD. The negative chamber of the comparison element 12 is connected to the output of a fifth switching relay 16, the normally open nozzle of which is connected to the output of the setting device 14 of the lower limiting level Rc. Normally closed nozzles of the relay 15 and 16 are connected to the output channel of the regulator P # L1, and the control chambers of the relay 15 and 16 are connected to the output of the pneumatic button 18, whose input is connected to the control (command) channel of the regulator P.

KOM

The regulator works as follows.

Pre-repeaters 7 and 8 adjust with a negative and positive shift, respectively.

In the automatic control mode, in the corrective channels of the RCOD command (and Рcor are usually zero (О kg / cm) in the control channel, the RCOM command is always equal to zero (О kg / cm g), as a result of which the actuator (output channel of the P regulator ( 1Л.) Is connected to the output of the proportional link PB (, | through the normally open nozzle of the second relay 17, the minus chambers of the comparison elements 11 and 12 through the normally open nozzles of the fourth 15 and fifth 16 relays receive pressure from setpoint 13 and 14 of the upper Pg and lower P levels of restriction - set pressure range. In this mode, the regulator carries out a predetermined proportional-integral law of regulation, while the output signal Pgyy of the regulator is within a predetermined pressure range, as long as PnPB (y Ј PB, output P (indicator 10 the zone has a logical zero (P 0) value. In the first switching relay 3, the normally open nozzle is open. The output of the adder 1 is connected via a variable adjustable throttle 2 and the upper open nozzle of the first switching relay 3 to the capacitor 4. The controller realizes the specified flax-integral law linear static characteristic

When the output of the Pg JX regulator changes, it becomes greater than the upper boundary level Pn, the output P, and the output Ki of the comparison element 11 in the zone indicator 10, signals of a logical unit are formed (Pk 1, P | (c.0 3 and 6 are switched and a negative pressure drop is generated at the constant throttle 5 by means of the repeater 7 with a shift. As a result, the pressure in the tank 4 and in the positive chamber of the adder 1 decreases at a constant speed, the value of which depends on

 ,

192306

conductor throttles 5 and the shift value of repeater 7. Reducing the pressure in the tank 4 - the output signal of the integral link - leads to a decrease in the output pressure of the regulator to the level P &

When the output signal, changing, becomes less than the lower limit of the PH level, a single signal occurs only at the output Pk, the zone indicator (RK ,, .0), the first relay 3 switches on a constant choke 5 using repeater 8 with

15, a positive pressure drop + D is created by a shift. As a result, the pressure in the tank 4 increases at a constant rate, the size of the cohort; also depends only on the air traffic control.

20 throttles 5 and the shift value of the repeater 8. The increase in pressure in the tank 4 of the integral valve led to an increase in the output ratio of the regulator to the level Rc.

25 In the remote control mode, the command P., - ,,, is set to one (1.4 kg / cm 2), as a result of which the relay 15-17 is switched. The control of the executive mechanism is exercised from the remote control channel Rrc. Channel pressure

sterez open (using RKOD.

35

and the pneumatic button 18) of the nozzle of the relay 15 and 16 enters the negative chambers of the elements 11 and 12 of the comparison.

I

If the output pressure of the proportional link is RO .... more pressure

Ry)

on the actuator rome then

at the outputs P k, and P Vl) of indicator 10, zones form single signals

(P, .. 1 and). The gel 3 and 6 are switched and on the constant choke 5 using the repeater 7 with a shift creates a negative pressure differential -D. Similarly to the described process, the pressure in the tank 4 and at the output of the proportional link 9 is reduced. Р8ЫХДО УР ° ВНИТ ІМ Similarly, if Р6 is smaller than ROME,

a single signal occurs only at the output of the RC (zone indicator (, PJ, - 0) o) Switches the first relay 3 and at a constant throttle 5 using a repeater 8 with a shift creates a positive pressure drop of h-d. The pressure increases in the tank 4 and at the output proportional link

9 Rbmhdo Level P

them

As a result, when the pneumatic button 18 is pressed in the remote control mode (P., 1), after some time has elapsed,

continuous switching (switching mode) of relays 3 and 6. As a result, the output of the proportional link P is kept at level P

R follows P "

Vim

i.e. pressure of 10

15

20

perception

DDI

the Rimregul torus line

Thus, the transition to the automatic control mode, even with the inequality of the controlled variable P., to its specified value P., is carried out without a pressure jump in the output line P of the regulator.

When operating in automatic control mode (), if it became necessary to change the output signal of the regulator, for example, to reduce, the command is equal to one (1.4 kg / cm), to the second correction channel (the Less command). On this command, single signals appear at the output of RC2. Element 11 of the comparison and at the output P in the indicator 10 of the zone (, RKY.- relays 3 and 6 are switched and on the constant choke 5 by means of repeater 7 with n shift negative pressure differential - As a result, the pressure in the vessel Ive to the positive chamber of adder 1 decreases with a constant speed, the value of which depends on the conductivity of throttles 5 and the amount of shift of the repeater 7. A decrease in pressure in the tank 4 - output signal of the integral link - leads to a decrease in outputThe pressure regulator to a desired value. After this command is removed (RCOR.), for which purpose the switch 20 is transferred to the center (neutral) position.

If it is necessary to increase the output., Pressure P ,, P8Y switch 20 is switched to the More position. At the same time, the supply pressure is supplied to the first correction channel P 0 0p (j, which switches the first relay 3 through the element OR 19 and throttle 5 with a repeater 8 with a shift creates a positive pressure drop + E. As a result, the pressure in the tank 4 increases at a constant speed, the value of which 55 also depends only on the conductivity of throttles 5 and the shift value of the repeater 8. The pressure increase in capacitor 161Р2308

This 4 integral link leads to an increase in the output of the regulator. When the output pressure of the regulator reaches the desired value, the More command is removed, for which the switch 20 is shifted to the middle (neutral) position. Here, the pressure from the first corrective channel .i is released (P,

35

40

PKOp.f is reset by r Kopt1 0 kg / cm2-), and the controller continues the implementation of the GTI-law within the specified pressure range,

Claims (1)

At the controller, the possibility of on-line correction (in automatic control mode — without transferring the control system to remote control) of the controller output signal appears. This extends the functionality of the controller. Moreover, by giving the command signals Rcorl and Rkor.2, it is necessary to correct the output signal of the regulator when switching to the automatic control mode, for example, to eliminate pressure jumps in the output line P of the regulator. In addition, the signals Pcor and Pkorg can be supplied from an automatic logic device, the outputs of which can be fed to several controllers at once. Such an operational intervention in the operation of the regulator (and especially regulators) in case of various disturbances of the technological regime, i.e. the supply of anticipatory effects on actuators (if the violations of the technological process are known in advance or even before the beginning of the change of the controlled parameters), allows to increase the dynamic accuracy of the adjustment process, to expand the scope of application of the regulator. Invention Formula Pneumatic regulator aut. St. No. 1040466, characterized in that, in order to expand its functionality and increase its accuracy, an OR logic element is installed, the output of which is connected to the control chamber of the first switching relay, one input - with the output of the zone indicator, the other input - with the first regulator channel, and the second correction channel is connected to one of the nozzles of the first comparison element in the indicator zone. 0 five 0 5 n ., 55 This 4 integral link leads to an increase in the output of the regulator. When the output pressure of the regulator reaches the desired value, the More command is removed, for which the switch 20 is shifted to the middle (neutral) position. Here, the pressure from the first corrective channel .i is released (P, five 0 PKOp.f is reset by r Kopt1 0 kg / cm2-), and the controller continues the implementation of the GTI-law within the specified pressure range, At the controller, the possibility of on-line correction (in automatic control mode — without transferring the control system to remote control) of the controller output signal appears. This extends the functionality of the controller. Moreover, by giving the command signals Rcorl and Rkor.2, it is necessary to correct the output signal of the regulator when switching to the automatic control mode, for example, to eliminate pressure jumps in the output line P of the regulator. In addition, the signals Pcor and Pkorg can be supplied from an automatic logic device, the outputs of which can be fed to several controllers at once. Such an operational intervention in the operation of the regulator (and especially regulators) in case of various disturbances of the technological regime, i.e. the supply of anticipatory effects on actuators (if the violations of the technological process are known in advance or even before the beginning of the change of the controlled parameters), allows to increase the dynamic accuracy of the adjustment process, to expand the scope of application of the regulator. Invention Formula Pneumatic regulator aut. St. No. 1040466, characterized in that, in order to expand its functionality and increase its accuracy, an OR logic element is installed, the output of which is connected to the control chamber of the first switching relay, one input - with the output of the zone indicator, the other input - with the first regulator channel, and the second correction channel is connected to one of the nozzles of the first comparison element in the indicator zone.