SU1403029A1 - Apparatus for automatic stabilization of process parameters - Google Patents

Description

(2J) 40J5963 / 24-24

(22) 01/28/86

(46) J5.06.88. Bnsh. №22

(71) Institute for the Design of Industrial and Transport Objects for the City Economy of the City of Moscow Mospromproject

(72) G.Ya. Zagapsky (53) 62.50 (088.8)

(56) Automation of single-stage chillers. T. I. Management, section 2.1. VNIIHolodmash RTM-10-70, p. 15-17, Annex 4.

(54) DEVICE FOR AUTOMATIC STABILIZATION OF TECHNOLOGICAL PARAMETERS

(57) The invention relates to automatic process control devices and can be used for temperature control. The purpose of the invention is to increase reliability. The device for automatic stabilization of technological parameters contains a sensor of a technological parameter, a switch, actuators, position sensors of executive mechanics, a timer, a trigger, elements OR and AND, a generator and a pulse distributor, 2 Il.

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The invention relates to the automation of technological processes in which the stabilization of a parameter is carried out by changing the number of technological units operating on the total load.

The purpose of the invention is to increase reliability by turning on and off technological units in the same sequence (which was previously turned on, the one turned off earlier),

FIG presents functional

in the zone is normal, the element And 5 will not start the generator of 6 pulses, and the two-terminal switch 8 will remain closed in the position in which

on the scheme of the proposed device; 15 3 coincides with the location of the parameter in figure 2 - an example of its implementation in the relay-contact base

The device contains a three-position sensor of technological parameters 1, a two-input element IL 2, the last state change occurred in a time. measures 3, trigger 4, element 5, pulse generator 6, pulse distributor 7, mutator 8, actuator 9, position sensors 10, execute elements and a multiple element OR 11.

. The device operates as follows.

If the deviation of the measured parameter from the norm coincides (circuit 30 of one of the two contacts of sensor 1, therefore, there is a signal at one of the inputs of the two-input element OR 2) with: pulse of timer 3 (with the switching state of trigger 4) 35 by means of the element -I 5, a generator of 6 pulses is started and through the ring distributor 7 pulses, simultaneously closes the contacts around the ring

technological unit in case of deviation of the parameter I measured from the norm.

Thus, under exaggerated conditions, the duration of the pulses of timer 3 and sensors 10 for changing the position of the actuator 9 is sufficient for switching trigger 4, and the frequency of the pulses at the output of generator 6 (the length of the period of alternate closure from the two-pole switch 8) 9, the passage and the pulse of the sensor 10 and the switching of the trigger 4, the actuating element 9 (technological unit), which earlier than others changed its position of a single-

switch 8, .connecting the performer-40 n direction, before the other, the transient elements of 9 technological units to the contacts of sensors 1,

The nearest actuator 9, whose position can be changed to reduce the deviation of the measured parameter,. the signal of sensor 1 changes its position, and sensor 10 changes the position of this actuator 9 (the state of the technical unit controlled by it) with its impulse transmitted through the multi-input element OR 11, changes the state of trigger 4, and is followed by & Pno, stops one of the signals at the input of the element I 5, turns off the generator 6 pulses and the ring unidirectional distributor 7 pulses, leaves in this position closed until the next one changes it to the opposite. As a result, the reliability of the technological system is significantly increased due to the equal wear and tear of its aggregates (the possibility of improving the conditions for its maintenance, repair and modernization).

In the example implementation (figure 2) of the device in the relay-contact element base of the function of the pulse generator 6, the ring unidirectional pulse distributor 7 and the ring switch 8, the stepper finder 12; trigger functions 4 - electromagnetic relay 13 with three closing contacts 14, I5 and 16; sensor functions of the 10 position of the executive (start) element of the technological gregata and multi-input 50

55

pulse timer 3 is a two-terminal switch 8, excluding the possibility of changing the state of more than one technological unit by one pulse of timer 3..

If the subsequent impulse of timer 3 coincides with the same deviation of the measured parameter, which was the case in the previous case, then the bipolar switch 8 next to it in the direction of the impulse distribution will remain closed.

If the subsequent impulse timer

in the zone is normal, the element And 5 will not start the generator of 6 pulses, and the two-terminal switch 8 will remain closed in the position in which proi3 coincides with the location of the parameter

The last state change occurred.

The last state change occurred.

technological unit in case of deviation of the parameter I measured from the norm.

Thus, under exaggerated conditions, the duration of the pulses of timer 3 and sensors 10 for changing the position of the actuator 9 is sufficient for switching trigger 4, and the frequency of the pulses at the output of generator 6 (the length of the period of alternate closure from the two-pole switch 8) 9, the passage and the pulse of the sensor 10 and the switching of the trigger 4, that actuating element 9 (technological unit), which earlier than others changed its position (co that

direction before any other

replaces it with the opposite. As a result, the reliability of the technological system is significantly increased due to the equal wear and tear of its units (the possibility of improving the conditions for its service, repair and modernization).

In the example implementation (figure 2) of the device in the relay-contact element base of the function of the pulse generator 6, the ring unidirectional pulse distributor 7 and the ring switch 8, the stepper finder 12; trigger functions 4 - electromagnetic relay 13 with three closing contacts 14, I5 and 16; sensor functions of the 10 position of the executive (start) element of the technological gregata and multiple input

3

element 11 or 11 - closing 17 and 18 blocking contacts of the magnetic actuator 19 (its coil and power contacts are not shown); the functions of the actuator 9 of the process unit are two electromagnetic relays: by impulse of their closing contact (not shown) including the magnetic starter relay 20 and by impulse of the normally open contact (not shown) the self-pickup circuit (not shown) disturbing the magnetic starter relay 21; the functions of the two-input element OR 2 and the element AND 5 are two diodes 22.

1403029

It includes a timer, characterized in that, with the aim of improving reliability, it additionally contains position sensors of the actuators, connected in series two-input element OR, element And, a pulse generator, a ring distributor of pulses, and also connected in series is a multi-input element 1-SHI and a trigger, with the second trigger input connected to the timer output, and its output to the second input of the AND element, the inputs of the two-input element PI1LI connected to the output m trehpozitsiFormula invention onnogo process variable transmitter, the outputs of multi-input elements apparatus for automatic hundred-OR 20 that are connected to the outputs of the sensors

15

bilization process parameters containing a three-position sensor technological parameter, the outputs of which are connected via a switch

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15

the position of the actuators, the control inputs of the switch are connected to the outputs of the ring pulse distributor.

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Claims (1)

Claim A device for automatic stabilization of technological parameters, ι containing a three-position sensor of a technological parameter, the outputs of which are connected through switching actuators, serially connected two-input OR element, element I, pulse generator, ring pulse distributor, as well as series-connected multi-input OR element and a trigger, said second trigger input coupled to the output of the timer 15 and its output - to the second input ^{and the} one elomon and, the two-input aND gate inputs LI are connected to the outputs of the three-position sensor of technological parameters, the outputs of the multi-input element OR are connected to the outputs of the position sensors of the actuating elements, the control inputs of the switch are connected to the outputs of the ring pulse distributor. -1 7. r-j l-ι | / \