SU1495581A1 - Automatic control system house service pipe - Google Patents

Abstract

The invention relates to a power system and makes it possible to increase the reliability of the launch and the reliability of the cause of the burner failure. This is achieved in that the display unit 27 of the system is equipped with five light indicators that are connected via power amplifiers 22-26 to the outputs of the flip-flops 16-20, the inputs of which are connected through the And 10-14 elements of the burner pilot control 5,6 and a sensor 7 of the position of the burner fuel valve, as well as with the outputs of the start-up unit 1, which is equipped with one input connected via the OR 12 elements to the trigger outputs and seven outputs connected to the electric igniter control 2,3,4 and the pilot and burner fuel valves and so same - with elements 10-14. When the burner fuel valve is open, one of the flame control sensors fails and the pilot or burner does not ignite, the launch of the latter is blocked until the blockage by the body 15 is turned on and the corresponding indicator turns on. 3 il.

Description

The invention relates to a power system, namely to devices for automatically controlling the ignition of gas-oil burners of various tenloaggregates. The purpose of the invention is to increase the reliability and reliability of the indication of the cause of the burner failure.

FIG. 1 is a functional diagram of a system for automatically controlling the ignition of the burner; in fig. 2 is a functional block diagram of the launch; in fig. 3 - diaphragm of the output signals of the trigger unit.

The system for automatic control of the ignition of the burner includes a start-up unit 1, an electric ignition control unit 2, a pilot and fuel valve control units 3 and 4, respectively, igniter flame control sensors 5 and a burner 6, a burner fuel valve position sensor 7, HE elements 8 and 9, elements AND 10-14, acknowledgment unit 15 triggers 16-20, element OR 21, power amplifiers 22-26, indication unit 27 with light indicators 28-32. The outputs of the sensors 5 and 6 are connected respectively to the first inputs of the elements And 10 and 12. The output of the sensor 7 is connected to the first input of the home element And 14. The second inputs of the elements 10 and 12 are connected to the fourth output of the start block 1, and the second inputs of the elements And 11, 13 and 14.- to the second, sixth, seventh outputs of block 1, respectively, the first, second and third outputs of which are connected to the inputs of blocks 2-4, respectively. The outputs of the elements 10-14 are connected respectively to the first inputs of the flip-flops 16-20, the second inputs of which are connectors 45 and 46 and, through series-connected delay elements 37-39, to the first input of the OR-NOT element, and the inverting output to its second input, with the first input of the element OR-NOT 42 and through the element 40 of the delay - with the fourth output 48 of the block 1. The output of the element OR-NO 43 forms the second output 49 of this block, and the output of the element OR-NOT 42 - its first output 50. The delay element 37 is connected to the second inputs of the elements OR 42, AND 46 and the first input of the electric ment and 44, the second input of which is connected to the output of OR-NO element 43, and the output forms an output of the fifth unit 51 1.

15 The output of the delay element 38 is connected to the second input of the AND element 45, the output of which forms the sixth output 52 of the unit 1. The output of the element 46 is connected to the third output 53 of the unit 1 and through the series-connected element HE 47 and the delay element 41 to the seventh output 54 of this block.

Elements 37-41 of the delay of the positive signal front can be performed by any known method, for example, contain a comparator with high input resistances, the output of which forms the output of the delay element, the inverting input is connected to the output of a voltage divider made on the first and second resistors connected between the power supply bus, a non-inverting input is connected to the output of an integrating filter, made on a high-resistance third resistor and a capacitor. In parallel, the third resistor is connected in series with a low-impedance fourth resis20

and the outputs 35 are torus and diode so that the cathode of the diode is connected to the input of the integrating filter, which is simultaneously the input of the delay element, and the anode to the output of the fourth resistor. The output voltage of the divider determines the threshold value of the comparator switching. When there is a low voltage level at the input of the delay element, the capacitor of the integrating filter is almost instantly discharged through a low-resistance fourth resistor and an open diode. In this case, the comparator output voltage is low. If a high level voltage is applied to the input of the delay element, the diode closes and the capacitor begins to charge through the high-resistance third

respectively, with the first, second, third, fourth and fifth inputs of the element OR 21 and through the power amplifiers 22-26 and the first, second, third, fourth, fifth inputs of the block 27 from the indicator Q and 28 to 32, respectively. The output of the element OR 21 is connected to the input of block I run.

The launch unit 1 has one input and seven outputs and is intended to form control commands for blocks 2-4 and elements 10-14 in accordance with the diagram (Fig. 3). It can be performed by any known method, for example, according to the diagram shown in (Fig. 2). In this case, block 1 contains the organ “Start 33, op45

“Stop 34, element OR 35, RS-trig 50resistor. At the time of charging the capacitor to

ger 36, elements 37-41 of the delay of the switching voltage of the comparator

of the positive signal front, the elements are switched and its output is also NOR-NOT 42 and 43, the elements AND 44-46 take the high level value,

the element is NOT 47. The first input is an element. Thus, the time since the supply OR 35 forms the input of block 1, its second input is connected to the body “Stop 34, and the output is the R input of the trigger 36, the input from which is connected to the authority Start 33 , direct exit - with the first entrances ele55

the positive front of the input voltage of the delay element to the formation of a positive front at its output is equal to the charging time of the capacitor to the switching voltage of the comparator. This is the time

And 45 and 46 and, through series-connected delay elements 37-39 - with the first input of the element OR NOT, and the inverting output - with its second input, with the first input of the element OR-NOT 42 and through the delay element 40 - with the fourth output 48 of the block 1. The output of the element OR NOT 43 forms the second output 49 of this block, and the output of the element OR-NOT 42 - its first output 50. The output of the delay element 37 is connected to the second inputs of the elements OR 42, AND 46 and the first input of the element AND 44 , the second input of which is connected to the output of the element OR-NOT 43, and the output forms the fifth output 51 of unit 1.

The output of the delay element 38 is connected to the second input of the AND element 45, the output of which forms the sixth output 52 of block 1. The output of the element 46 is connected to the third output 53 of block 1 and through the series-connected element NOT 47 and the delay element 41 to the seventh output 54 of this block .

Elements 37-41 of the delay of the positive signal front can be performed by any known method, for example, contain a comparator with high input resistances, the output of which forms the output of the delay element, the inverting input is connected to the output of a voltage divider made on the first and second resistors connected between the supply bus, a non-inverting input is connected to the output of an integrating filter, made on a high-resistance third resistor and a capacitor. In parallel, the third resistor is connected in series with a low-impedance fourth resis.

5 torus and a diode so that the cathode of the diode is connected to the input of the integrating filter, which is simultaneously the input of the delay element, and the anode to the output of the fourth resistor. The output voltage of the divider determines the threshold value of the comparator switching. When there is a low voltage level at the input of the delay element, the capacitor of the integrating filter is almost instantly discharged through a low-resistance fourth resistor and an open diode. In this case, the comparator output voltage is low. If a high level voltage is applied to the input of the delay element, the diode closes and the capacitor begins to charge through the high-resistance third

Thus, the time since filing

the positive front of the input voltage of the delay element to the formation of a positive front at its output is equal to the charging time of the capacitor to the switching voltage of the comparator. This is the time

the corresponding time delay is determined by the resistance of the third resistor and the capacitance of the capacitor.

The Start 33 and Stop 34 bodies are buttons with closing contacts, through which the positive power supply is connected to the first output of the resistor, which forms the output of the body 33 or 34, the second output of this resistor is connected to the common power cord. A capacitor is connected between the output of the “Stop 34” and the common power supply, which ensures that the trigger 36 is set to the “O” state when the power supply of the start-up unit 1 is turned on (“O - low voltage level).

The values of the output signals of the launch unit 1 at different instants of time ti-tr are shown in the diagram (Fig. 3). In the initial state at time ti, the trigger is set to the state "O", which means that on its forward pass the signal is equal to "O" and on the inverting state - "1 (" 1 - high voltage level). In this case, a signal equal to “I, arriving at the inputs of the OR-NO elements 42 and 43, provides at their outputs a signal equal to“ O and, respectively, at the outputs 50 and 49 of the trigger unit 1. The same output signal of the trigger 36 through the delay element 40 arrives at the output 48 of the block 1. At the same time, from the inverting output of the trigger 36, a signal equal to “O provides the setting“ O and through the elements 45 and 46 enters the outputs 52 and 53 of block 1, respectively. The output signal of the element I 46, inverted by the element NOT 47, arrives at the output 54 of block 1 through the delay element 41 as “1. In addition, the output signals of the elements OR NOT 43 and 37 delay ensure the presence of "On the output element And 44 and the output 51 of block 1.

If, at the input of block 1, the signal corresponds to "O, then at the formation of an arbitrary time t2 by the authority" Start 33 of a signal equal to "1, trigger 36 switches to state" 1, i.e., at its forward output, the signal becomes equal to "1, and the inverting -" O. Then, at the inputs of the OR-NO elements 42 and 43, the signals have the values of "O, and at their outputs, signals equal to" are generated, which arrive at the outputs 50 and 49 of unit 1, respectively. The signal is equal to "Oh, with the inverting output of the trigger 36 through the delay element 40 is fed to the output 48 of block 1.

A signal of 1 1 from the direct output of flip-flop 36 is delayed by delay element 37 for about 2-5 seconds. The values of the remaining output signals in block 1 are not

change.

After the delay time generated by the element 40, at the time (s the output signal of this element takes

five

0 5 0 5

0

five

the value “1, which, having arrived at the input of the element OR-NOT 42, ensures the appearance at the output of this element and at the output 50 of block 1 a signal equal to“ O. From the output of the delay element 37, the signal "1 simultaneously arrives at the inputs of the AND 44 and 46 elements. Since their other inputs also receive the" 1 respectively from the output of the OR element - NOT 43 and from the direct output of the trigger 36, the output signals of these elements take the value “1. This means that at the outputs 51 and 53 of block 1, the signals are equal to “1. The output signal of the AND 46 element is inverted by the NOT 47 element through the delay element 41, in the form "O, arrives at the output 54 of block 1. In addition, the output signal of the delay element 37, equal to" 1, is fed to the input of the delay element 38 and is delayed by it time equal to 2-5 s.

After the specified time has elapsed at time t, at the output of delay element 38, the signal value becomes equal to "1. This signal arrives at the input of the delay element 39 and is delayed by it for about 1 minute. At the same time, it arrives at the input of the And 45 element, at the other input of which a signal equal to "1" is received, coming from the direct output of the trigger 36. Therefore, at the output of the And 45 element and the output 52 of block 1, the signal takes the value "1.

After the delay time of the element 39 at the time ig, the output signal generated by this element, equal to "1, is fed to the input of the element OR - NOT 43, with the result that at its output there is a signal equal to" O, which goes to the output 49 of unit 1 and through element 44 - to its output 51. Further, the state of the output signals of block 1 does not change until the formation at an arbitrary time t, the body "Stop 34 signal equal to" 1, or until the input "1 at the input of block 1. When this happens , trigger 36 is switched to the state "O. Its signal, equal to “O and formed at the direct output, provides the setting“ O at the outputs of all delay elements and elements AND, and the signal equal to “1 and formed at the inverting output, at the outputs of all elements OR NOT. In addition, "1 from the inverting output of the flip-flop 36 is fed to the input of the element 40 and is delayed by it for a time equal to 1-2 s, and the output signal of the And 46 element, equal to" O inverting, enters as "1 to the input of the element 41 delay and delayed them at a time approximately equal to the delay time element 40. In this case, the output signals of elements 40 and 41 remain equal to "O. Thus, at time t, all the output signals of block 1 are “O.

After the end of the delay time, elements 40 and 41 at time t, their output signals and output signals of block 1 at outputs 48 and 54 take the value "1. Further, the states of the elements of block 1 and its output signals remain unchanged and correspond to their initial states given for time ti.

Blocks 2-4 of the electric igniter control, the pilot valves of the igniter and the burner respectively provide power amplification of logic signals and can be performed by any known method, for example in the form of a semiconductor key, the output of which is connected to the executive relay.

Sensors 5 and 6 of the pilot flame control and the main burner should monitor the presence and absence of flame, forming the logical signals “O in the presence of a flame and signals“ 1 in the absence of a flame at the output. For example, sensors 5 and 6 can contain a two-pole power source, a photoresistor connected via a signal converter with an inverting comparator input, the output of which is connected to the executive key via frequency discriminator and to the second integrator input through inertial key . The third input of the integrator is connected to the common power source bus, and its fourth input via a variable resistor is connected to the positive power supply bus. The integrator output is connected to the inverting input of the comparator. The output of the actuator is the output of the flame sensor.

The sensor 7 of the position of the fuel valve of the burner should generate logic signals: “O - when the valve is in the closed position,“ 1 - when it is open.

As the sensor 7 for the position of the burner valve fuel, a limit switch of this valve can be used, to the output of which a discrete-to-logic converter is connected, for example, made on a resistor. The first pin of this resistor is connected to the positive power supply power supply terminal, and the second output, via a limit switch, to the common power supply terminal. The output of sensor 7 is the second output of the resistor.

The acknowledgment unit 15 is designed to generate logical signals: "I - at the time of turning on the supply voltage and when it is applied to it; “Oh - before acting on him. This can be achieved by using a push-to-do button and a resistor connected in series between the positive and common supply voltage, and a capacitor connected in parallel with the button contacts. The output of the handshake unit 15 is the junction point of the resistor and the button.

The device for automatic control of the ignition of the burner works as follows.

In the initial state, on the first 50, second 49, third 53, fifth 51 and 52 outputs of the trigger unit 1, the signal values correspond to "O, and on the fourth 48 and seventh 54 its outputs -" 1.

The flip-flops 16-20 are set to "O, i.e., their output signals are equal to" O, i.e., their output signals are equal to "O. In this case, the 2-4 control units of the electric igniter, igniter fuel valve

and fuel valve burner provided-. The disabled state of the corresponding actuators is turned off, and the second inputs of the And 10, 12 and 14 elements receive signals equal to "1. If the pilot flame control sensor 5 is defective,

i.e., in the absence of a flame, it forms a signal equal to “O, which is NOT 8, inverted through the element 8, to the first input of the AND 10 element as“ 1, then the output signal of this element, and hence the signal to S- the input of the trigger 16 is equal to "1. Therefore, the trigger 16 is switched to the state "I, its output signal equal to" 1, through the power amplifier 22 is fed to the indicator 28, ensuring its activation, and through the OR element 21 - to the input of the unit 1

start, providing a lock on his work, and hence the ignition of the burner. The on indicator 28 indicates a sensor 5 malfunction, i.e., the reason for blocking the ignition of the burner. When the burner flame control sensor 6 fails, the trigger 18 switches to state "1", the ignition is blocked and the indicator 30 turns on, and when the burner fuel valve is open, the output of this valve is 7

"1 and entering through element 14 on the S input, state 1 switches trigger 20, which blocks the ignition of the burner and turns on the indicator 32. The burner can be ignited only after troubleshooting and acknowledging

with the help of block 15. After that, all the triggers are set to the state "The signal at the input of the trigger unit 1 also takes the value" O and the blocking of the operation of this block is released.

If, using the Start-up authority, start-up block 1 starts, it begins to generate output signals in accordance with the diagram (Fig. 3), i.e., at the start-up time (time 12), at its first 50 and second 49 outputs, the signals take the value 1, and at the fourth exit 48 - “O. The signals generated by the unit 1 equal to “1, provide through the appropriate blocks the switching on of the electric igniter and the pilot valve of the pilot, and the signal.

equal to “O, arriving at the second inputs of elements I 10 and 12, ensures the formation at their outputs of signals equal to“ O, regardless of the values of the output signals of sensors 5 and 6 of the pilot flame control and the burner. After the time required for ignition of the igniter from the electric igniter (at time ts), the value "1" receives signals at the third 53 and fifth 51 outputs of block 1, and at the first 50 and seventh 54 signals, the signals become equal to "O. In this case, the signal equal to “1” is fed to the second input of the element 11 and, if the pilot flame does not exist at this moment, i.e. the output signal of the flame control sensor 5 arriving at the first input of the element 11 is equal to 1, then the output the signal of this element, and hence the signal at the S-input of the trigger 17 is equal to “1. Therefore, the trigger 17 switches to the state "1", providing through the power amplifier 23 the turning on of the indicator 29, resetting the starting unit 1 to the initial state (corresponding to the time ti) and blocking the ignition of the burner. If the igniter ignites successfully and at the output of sensor 5, the signal takes the value "O until time point 3", then the value of the output signal of the element I 1 and the state of the trigger 17 do not change and correspond to "O. In this case, a signal equal to "O, from the seventh output of block 1, arriving at the second input of element 14, blocks the signal from sensor 7 of the position of the fuel valve of the burner to the S input of the trigger 20. At the same time, the signal equal to" 1 from the third output 53 block 1 through block 4 provides the inclusion (opening) of the fuel valve of the burner, and a signal equal to “O from the first output of block 1 through block 2 turns off the electric igniter.

A burner ignites from the igniter. After the time required for this process (at time t .;), at the sixth output 53 of block 1, the signal is equal to "1, and fed to the second input of element 13". If by this time the burner has not ignited, t i.e. the output signal of the burner flame control sensor 6, arriving at the first input of element 13 and 13, is equal to "1, then a signal equal to" 1 is formed at the output of this element, and, arriving at the S input of the trigger 19, switches it to "one. This is provided through the power amplifier 25, turning on the indicator 31, resetting the unit 1 to the initial state and blocking the ignition of the burner. In case of successful ignition of the burner at the output of sensor 6, the signal is equal to "O, so the value of the output signal of the element 13 and the state of the trigger 1.9 remains equal to" O, as before t. (.

After the time required to stabilize the combustion of the torch flame (in

0

time ts), on the second 43 and on 51 outputs of block 1, signals equal to "O" are generated, which, acting on the inputs of block 3 and element 11 and 11, respectively, turn off the fuel valve of the pilot and control its flame. This is the end of the burner ignition process. If for some reason (at time t) the burner flame goes out, the value of the output signal of the burner flame control sensor 7 changes from "O to" 1 and this signal through element 13 switches the trigger 19 to the state "1. The output signal of the trigger 19, equal to "1, through the amplifier 25 power

5 turns on the indicator 31, which signals the absence of a burner flame, and through the OR element 21, arriving at the input of block I, blocks the ignition of the burner and provides the formation of signals equal to “O at the third 53 and sixth 52 outputs of block 1. These signals will affect the inputs of the unit 4 and the element And 13, respectively, provide for shutting off the fuel valve of the burner and controlling its flame.

After the time required for

5 closing the fuel valve of the burner (at time t,), at the fourth 48 and seventh 54 outputs of block 1, signals equal to "1" are formed, which, having entered the second inputs of the elements 10, 12 and 14, enable the control of issuing false

0 signals from the outputs of the sensors 5 and 6 control the position of the fuel valve of the burner, respectively. This device state corresponds to the original one.

The planned shutdown of the burner can be carried out with the help of the organ “Stop

5 block 1. In this case, block 1 generates the same output signals as in the previous case when the burner flame extinguishes. These signals ensure that the fuel valve closes, the control is turned off.

Q flame and bringing the device for automatic ignition of the burner to the initial state, at which the position of the fuel valve of the burner is monitored by the output signal of the sensor 7 and the operability of the control sensors 5 and 6

5 flame on their output signals.

If the burner fuel valve is not closed and the pilot burner flame control sensors are faulty, the burner start is blocked and an indication of the reason for blocking the start is provided. When non-flammable,

0 The research institutes of the igniter or burner during their ignition start the burner is also blocked and there is a separate indication of their unsuccessful ignition. The corresponding indication is activated when the pilot light or the burner goes out, as well as when the fuel valve is not closed, the mount is turned off. 1ki after her stop.

In addition, the proposed system provides for separate control of the flame.

the burner and the burner, which, after turning off the electrical ignition source for the flame control sensors, also provides for joint operation of the igniter and the burner for some time, at which the burner flame burning process is stabilized.

Claims (1)

Invention Formula A system for automatic control of the ignition of the burner, comprising a pilot flame control sensor connected through the element NOT to the first input of the AND element and directly to the first input of the second element. And, the trigger. OR, two elements AND, four triggers, two power amplifiers and a handshake unit, the burner flame control sensor is connected via the second element NOT to the third input - from the AND head GO and directly to the fourth element input AND, the burner fuel valve position sensor is connected to the input the five And elements, the first inputs of all five triggers are connected respectively to the outputs of the five And elements, and the second inputs of all the triggers are connected to the output of the acknowledgment unit, the outputs of all the triggers are connected to the inputs of the OR element and five inputs divisors power, the outputs of which are connected to the unit ten the control units of the fuel indicator valves, equipped respectively with a pilot light and a burner, a burner fuel valve position sensor, three power amplifiers, a start-up unit, the first output of which is connected to the control unit input of the electric igniter, and a second output of the network inputs and five light indicators, the start-up unit with one input, which is connected to the output of the OR element, and seven outputs, the third output of the start-up unit is connected to the control unit with the input of the fuel control unit 20 with a fuel valve burning and, the four-way valve of the igniter, and the third electric output - with the second inputs of the first and third elements And, the fifth output - with the second input of the second element And, the shield with the input of the fourth element And, 25 and the seventh - with the second input In addition, in order to enhance the reliability and reliability of the indication of the cause of the burner failure, it additionally contains a burner control sensor, the second element is NOT, the element Menta I. OR, two elements AND, four triggers, two power amplifiers and a checkout unit, the burner flame control sensor is connected via the second element NOT to the input of the third AND element and directly to the input of the fourth And element, the sensor position of the fuel valve of the burner is connected to the input of And, the first inputs of all five triggers are connected respectively to the outputs of five AND elements, and the second inputs of all triggers are connected to the output of the acknowledgment unit, the outputs of all triggers are connected to the inputs of the OR element and the inputs of five amplifiers power output whose outputs are connected to the unit three inputs, the start block is made with one input, which is connected to the output of the OR element, and seven outputs, the third output of the start block is connected to the control unit of the fuel valve of the burner, the fourth exit - with the second inputs of the first and third elements , the fifth output — with the second input of the second element I, the schist — with the input of the fourth element I, and the seventh — with the second input of the fifth elephant — the top output and the third with the second — with the seventh Menta I.