KR900008428B1 - Start ignition explosion prevention system in gas heater - Google Patents

Abstract

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Description

Initial ignition explosion prevention device and method of gas heater

1 is a system diagram of a solenoid valve and a linear gas valve of an initial ignition explosion prevention device of a conventional gas heater.

2 is an arrangement diagram of the solenoid valve and the linear gas valve of the initial ignition explosion protection device of the gas heater of the present invention.

3 is a schematic block diagram of a control circuit of a gas heater used in the present invention.

4 is an AC wiring diagram of a gas heater according to the present invention.

5 is a flowchart showing a control method according to the present invention.

6 is a time chart of a heating (strong) operation sequence of a heater according to the present invention.

* Explanation of symbols for main parts of the drawings

5: gas piping 7: first solenoid valve

8: 3rd solenoid valve 9: linear gas valve

10: second solenoid valve 22: relay drive circuit

RY ₁ -RY ₁₀ : Relay

The present invention relates to an apparatus and method for preventing an initial ignition explosion of a gas heater, and in particular, an initial ignition explosion of a gas heater for preventing an explosion and an explosion sound due to instantaneous ignition by adjusting the gas supply amount to a minimum ignition amount during the initial ignition of the gas heater. It relates to a prevention device and a method.

In general, during the initial ignition of the gas heater, the ignition device is operated and the gas valve is opened after a few seconds, so that the flame discharge is performed in the combustion chamber first and the gas is supplied after several seconds to ignite the bar. Looking at the conventional initial ignition process in the gas heater, as shown in FIG. 1, the first and second solenoid valve 1, the linear gas valve 2 and the input measuring point in the gas pipe (5) (3) The nozzles 4 are sequentially connected, the linear gas valve 2 is opened at the same time as the operation is performed, and the preliminary gripping is performed, and then the first and second solenoid valves 1 are discharged inside the combustion chamber by an ignition device. ) By opening the gas is injected into the combustion chamber through the nozzle (4), the ignition is made, and at this time, the ignition is instantaneously generated, and the explosion sounds with the explosion.

Accordingly, the first and second solenoid valves 1 are opened while the linear gas valve 2 is closed in order to prevent the explosion sound from being exploded, and the linear gas valve 2 is slowly opened and ignited. However, since the linear gas valve 2 is subjected to a gas pressure, the linear gas valve 2 is vibrated, and the linear gas valve 2 is opened by the gas pressure, so that the ignition control is difficult.

An object of the present invention is to control the amount of gas supplied during the initial ignition to the minimum ignition amount to eliminate the gas pressure applied to the linear gas valve to prevent the vibration of the linear gas valve as well as to prevent the explosion and explosion noise during ignition In order to achieve the above object, the present invention provides a microprocessor for multi-stage thermal power control and operation sequence control, and a relay drive circuit connected to the microprocessor to selectively drive a plurality of relays. And a DC constant voltage circuit, a 120-health square wave circuit that generates a 120-health cycle square wave and uses it as an external interrupt signal, thereby allowing the microprocessor to perform an external interrupt every 8.33 milliseconds, and initial setting of the microprocessor. Reset circuit to be used and key to select key input A four-digit drive circuit portion for controlling key input, an abnormal state and a time display, a seven-segment drive circuit portion for a time display, an LED display circuit portion for indicating an operation state and an abnormal state of self-diagnosis, A buzzer drive unit that emits a warning sound, a gas type selection circuit for selecting the type of gas used, a fan motor speed detection unit for detecting the rotation of the fan motor, an ignition detection circuit for detecting the operation of the igniter, and ignition of the frame rod A frame rod ignition detection circuit for detecting a state, a room temperature sensing circuit for detecting a room temperature by a room temperature dummyster, a hot air temperature sensing circuit for detecting a blowing temperature by a hot air dummyster, and a linear gas valve controlling a linear gas valve A gas heater control device comprising a control circuit and fan motor drive circuits for driving a fan motor, the gas heater control device comprising: And an initial ignition explosion prevention device composed of a first solenoid valve, a second solenoid valve, and a third solenoid valve connected in parallel with the linear gas valve so as to be driven in accordance with each other. In operation, it is judged whether it is burning first.In case of combustion, follow the normal operation sequence, but if not, open the linear gas valve to the minimum and introduce the minimum gas, and then compare the room temperature and the set temperature. If the room temperature is higher than the set temperature, the initial state is transferred to the initial state. Otherwise, the operation is performed to determine whether 30 seconds of prephasing has elapsed, and when the 30 seconds of prephasies have elapsed, the first and second solenoid valves After turning on the igniter and judging whether the ignition 1 second period has passed, if the 1 second period elapses, the second sole Gradually increasing the amount of gas by opening the third solenoid valve connected to the linear gas valve in parallel with the idle valve, and then ignition detection is performed. Judging whether the elapsed time has elapsed, and when the three-second period elapses, turning off the first, second and third solenoid valves and the igniter, and simultaneously turning off the operation sequence to indicate the non-ignition state; When the ignition is detected, the igniter is turned off and the combustion LED is turned on to indicate that the combustion is in progress, and it is determined whether the temperature of the hot air sensor is 50 ° C or higher, and the fan motor is turned on when the temperature of the warm air dummyster is 50 ° C or higher. To perform a normal heating (strong) operation sequence, and while performing this operation sequence, the linear gas valve is strongly operated at a warm air temperature of 50 degrees. Um and about driving, driving off or reset when the hot air, the temperature is in the burner motor wind pressure switch and the fan motor is turned off in less than 40 ℃ is one to occur in operation, the entire system is turned off.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 2 is a diagram showing an arrangement of solenoid valves, that is, first and second third solenoid valves, linear gas valves, pressure measuring units, and nozzles, to prevent explosion during initial ignition of the present invention. 7 is connected to the gas pipe 5.

A linear gas valve 9 is connected to the solenoid valve 7, and a third solenoid valve 8 is connected in parallel with the linear gas valve 9. The second solenoid valve 10 is connected to the linear gas valve 9, and the pressure measuring unit 12 and the nozzle 11 are connected to the rear end of the second solenoid valve 10.

Therefore, the gas supplied to the gas pipe 5 passes through the linear gas valve 9 and the third solenoid valve 8 via the first solenoid valve 7, and then the third solenoid by the control process described in detail later. The valve 8 maintains the same gas pressure on the inlet side and the outlet side of the linear gas valve 9.

3 is a schematic overall block diagram of a gas heater control apparatus used to control the operation of the present invention, which includes a microprocessor 20 for controlling multi-stage power control and an operation sequence.

The DC constant voltage circuit 21 supplies a constant voltage selectively to the microprocessor 20 and the control circuit.

The relay driving circuit 22 is connected to the microprocessor 20 and selectively drives the relays RY _{1 to} RY ₁₀ connected thereto according to the control signal of the microprocessor 20 to igniter IG and burner motor BM. ), The display lamp L ₁ , the contactor LM, the first and third solenoid valves 7 and 8, and the second solenoid valve 10 are driven.

The 120 health square wave generator circuit 23 is connected to the microprocessor 20 and generates a square wave of 120 health cycles so that the micro processor 20 uses this signal as an external interrupt signal. Will be generated.

)에 접속되어 시스템의 초기 설정을 유도시킨다.The reset circuit 24 is a reset terminal of the microprocessor 20 (

) To drive the initial setup of the system.

The key scanning circuit section 25 is connected to the microprocessor 20, which detects the selection of the key input in accordance with the key input. Four-digit drive circuit section 26 for controlling key input and abnormal state and time display is connected to the microprocessor 20 so that the time display device 27 and the abnormal state display device 29 are controlled under the control of the microprocessor 20. The 7-segment driving circuit portion 28 for controlling the control and driving the visual display device 27 is connected to the microprocessor 20.

The LED display circuit part 29 which shows the abnormal state of an operation state is comprised by the 7-segment drive IC 30 and 14 LED matrix parts 31 which display an operation sequence.

The buzzer driving circuit 33 is connected to the microprocessor 20 to emit a warning sound in the abnormal state of the system under the control of the microprocessor 20. The fan motor driving circuit 34 is described in detail later, and is connected to a terminal of the microprocessor 30 to control the operation of the fan motor.

The gas type selection circuit 35 is connected to the microprocessor 20 and configured to apply power according to the gas type.

The fan motor rotational speed detector 36 includes a hall sensor (not shown) to apply a detection signal of the rotational speed of the fan motor to the microprocessor 20. The ignition detection circuit 37 includes an igniter IG to detect an ignition operation of the igniter and applies the signal to the microprocessor 20. The frame rod arrival detection circuit 38 is provided with a frame rod (not shown) and generates a square wave signal of 60 health in normal state and a square wave signal of 120 health in abnormal state to be applied to the microprocessor 20 according to the ignition state. Consists of.

The room temperature sensing circuit 39 causes the voltage of the room temperature dummyster R + H to be applied to the microprocessor 20 according to the change in the resistance value of the room temperature dummyster.

The warm air temperature sensing circuit 40 applies a detection signal according to the warm air temperature change to the microprocessor 20 by the warm air dummyster HTH. The linear gas valve control circuit 41 is configured such that a linear gas valve (not shown) is connected to the microprocessor 20 to drive under the control of the microprocessor 20 and its feedback signal is applied.

4 is a circuit wiring diagram showing a state in which the solenoid valve of the initial ignition explosion prevention device of the present invention is connected, wherein a fuse F ₁ is connected to one side of the plug P and a temperature fuse F ₂ is connected to the other side. . Both ends of the fuses F ₁ and F ₂ are connected in parallel with a transformer TR ₁ and a varistor ZNR for supplying power to the DC constant voltage circuit 21 of FIG. 3, indicating that power is applied. A diode D ₁ connected in series and a resistor R ₁ and an LED L ₁ are connected between the thermal fuse F ₂ and the varistor ZNR, and a charging capacitor (LED) is connected to the LED L ₁ . C ₁ ) is connected in parallel. This is composed of an LED driving circuit, the LED (L ₁ ) is turned on when power is applied to the plug (P).

Next to the LED driving circuit, a relay RY ₁ and a contactor LM of a compressor (not shown) are connected in series.

A fuse (F ₁₎ are connected to the mozzarella ray (RY ₃₎ the movable terminal side is connected to the, in the one side fixed terminal of the relay (RY ₃₎ the relay (RY _2). The relay RY ₂ is separately connected to one side of the transformer TR ₂ for power supply to the system, and the other side of the transformer TR ₂ is connected to one fixed terminal of the relay RY ₄ .

The movable terminal of the relay RY ₄ is connected to the thermal fuse F ₂ , and the other fixed terminal thereof is connected to the fixed terminal of the relay RY ₅ .

The movable terminal comprises first and second switches (RY -a ₈₎ of the relay there is connected to the (RY _8), each relay (RY ₈₎ of the other side fixed terminal and the relay (RY ₅₎ of the relay (RY ₃₎ and ( Are individually connected to RY ₈ -b).

The relay (RY ₈₎ of the movable terminal is movable terminal relay (RY ₅₎ and the first switch is connected to one side of the fixed terminals of the relay (RY _6), a relay (RY ₆₎ of the first switch (RY ₈ -a) It is connected between (RY ₈ -a) parts, and the other fixed terminal thereof is connected to the bridge rectifier circuit Br. The relay (RY ₈₎ the second switch (RY -b ₈₎ runs from the one side by way of the relay (RY ₇₎ connected between the relay (RY ₅₎ and the first switch (RY ₈ -a) Signature (IG of ) And at the same time one side is connected to the burner motor BM connected between the relay RY ₅ and the first switch RY ₈ -a.

The bridge rectifier circuit Br has a first solenoid valve 7 at its output end, a second solenoid valve 10 having a relay RY ₉ and a third solenoid valve 8 having a relay RY ₁₀ in parallel. Is connected.

The fan motor driving circuit 34 is composed of a resistor R ₂ and a light emitting element of the opto triac OT at a terminal of the microprocessor 20, and the triac, which is a light receiving element of the opto triac OT, is a resistor. It is directly connected to the thermal fuse F ₂ via R ₃ and connected to the fuse F ₁ on the relay RY ₁ side via a resistor R ₄ .

In addition, one side of the fan motor FM is connected to the thermal fuse F _{2 in} parallel with the opto-triac OT, and the thyristor SCR is connected to the other side of the fan motor FM.

The thyristor SCR is connected to a fuse F _{1 while} its gate is connected between the light receiving element of the optotriac OT and the resistor R ₄ , and the other side thereof is connected in parallel with the capacitor C ₂ . do.

Therefore, when the relay RY ₁ of the relay driving circuit 22 is driven under the control of the microprocessor 20 of FIG. 3, the contactor LM is controlled to drive the compressor for cooling.

In addition, when the relay RY ₃ is operated to the relay RY ₂ side and the relay RY _{4 is} connected to the transformer TR ₂ side, the relay RY ₂ is operated to supply power to a separate system.

When the relay RY ₃ operates to the relay RY ₈ side and the relay RY ₄ operates to the relay RY ₅ side, the burner is operated according to the operation of the relay RY ₅ and the second switch RY ₈ -b. When the motor is running and the relay (RY ₇ ) is activated, the ignitor is activated. In accordance with the operation of the relays RY ₄ , RY ₅ , the relays RY ₆ , and the switches RY _8- b, the bridge rectifier circuit Br rectifies and turns on the first solenoid valve 7. According to the operations of RY ₉ and RY ₁₀ , the second solenoid valve 10 and the third solenoid valve 8 are turned on.

The fan motor FM drives the triac of the optocoupler OT when the signal from the microprocessor 20 turns on the light emitting device of the town coupler OT via the resistor R ₂ .

When the triac is driven, the gate of the thyristor SCR is driven to drive the fan motor FM connected to the thyristor SCR.

The third solenoid valve 8 is operated and controlled in accordance with the driving of the relay RY ₁₀ and is actually connected in parallel with the linear gas valve 9 with respect to the pipe 5 as shown in FIG.

5 is a flow chart showing the control process of the initial ignition explosion prevention apparatus of the present invention, that is, the microprocessor 20 by connecting the third solenoid 10 to the linear gas valve 9 and the pipe 5 in parallel. The control process of is as follows.

First, when the system is turned on and operation starts in step 100, the process proceeds to step 101. In step 101, it is determined whether the system is in operation. If not, the system stop sequence of the operation sequence is performed.

That is, the first, second, and third solenoid valves 7, 10, and 8 of FIG. 2 are turned off immediately (step 120), and the sensing temperature of the warm air dummyster TH is 40 ° C or lower. In step 121, the burner motor BM and the fan motor FM are turned off when the temperature is below 40 ° C (step 120).

At this time, the period during which all the solenoid valves 7, 8, 10 are turned off and the detected temperature of the warm air temperature dummyster becomes 40 ° C is about 30 seconds, and this period is called a post-gripping period.

If it is detected in step 101 that the current system is in operation, the process moves to step 102 to detect whether it is currently burning.

If the system is burning, the operation sequence according to the calculation of the proportional differential integral (PID) between the room temperature and the set temperature is performed. If the current combustion is not equal to the actual thermal power, the linear gas valve 9 of FIG. 2 is controlled to increase the supply gas amount (step 131). If more than the set thermal power to go to step 132 it is determined whether the same as the set thermal power again.

If it is equal to the set thermal power, the supply gas amount of the linear gas valve is fixed (step 133), otherwise the supply gas amount of the linear gas valve is reduced (step 134).

Then, it is determined whether the temperature of the warm air dummyster is 50 ° C. or more (step 135).

When the temperature of the warm air dummyster is 50 ° C. or more, the fan motor FM is turned on, and when the fan motor FM is turned on, the process moves to step 137 to determine whether the room temperature is higher than the set temperature.

If the room temperature is high, the operation continues to the step 101, and if the set temperature is high, the process moves to the step 138 to temporarily turn off the first, second and third solenoid valves (7), (10) and (8). The driving is turned off.

The operation sequence at the time of initial ignition of the present invention is performed when it is determined that the system is not currently burning, and first, in step 103, the amount of supply gas to the linear gas valve is adjusted to the minimum.

Then, it is judged whether the room temperature is lower than the set temperature, and if it is judged to be low, the process proceeds to step 105, where the pre-phage operation is performed for 30 seconds (step 105).

After 30 seconds of pre-phage operation, move to step 106 to drive the ignition transformer (not shown) to turn on the first and second solenoid valves 7 and 10 and the igniter and continue to the step. In the preliminary ignition step 107, preliminary ignition is performed for a predetermined time, that is, 1 second.

Therefore, after the ignition transformer is driven for one second of the predetermined period, the second solenoid valve 10 is turned off in step 108 and the third solenoid valve 8 serving as the shutoff valve is operated.

Here, it can be seen that the minimum amount of ignition gas is supplied to the linear gas valve 9 to prevent the occurrence of explosion, and when the ignition is performed in the combustor, the second solenoid valve 10 is blocked and at the same time the third solenoid valve ( Since 8) is opened, as shown in FIG. 2, the gas pressure applied to the inlet and the outlet of the linear gas valve 9 becomes the same, and thus the vibration of the linear gas valve 9 is prevented.

Ignition is made and then in step 109 it is determined whether the frame rod has detected ignition and the ignition detection time is 1 second. When the first 1 second of the ignition is detected, the flow moves to step 110 to turn off the igniter and to turn on the combustion LED to indicate the combustion state.

Here, it can be seen that the igniter is operated for 2 seconds by adding 1 second of preliminary ignition period and 1 second of ignition detection time, and accordingly, the ignition transformer (element coupled with the ignitor: not shown) is driven for 2 seconds. Able to know.

When the combustion is made, it is determined whether the temperature of the hot air dummyster is 50 ° C. or higher in step 111, and the fan motor FM is turned on when the temperature of the hot air dummyster is 50 ° C. or higher.

Therefore, the system is again operated in the normal operation sequence and the linear gas valve 9 causes the increase or decrease of the supply gas amount to the combustor until it is above the set fire power.

On the other hand, if the ignition is not detected for more than 1 second in the ignition step 109, the process moves to step 112 to determine whether the non-ignition detection period is a predetermined period, that is, 3 seconds has elapsed. In steps 113, 114, 115 and 116, the first, second and third solenoid valves 7, 10 and 8 and the igniter are turned off, and then At the same time, the operation is turned off and the indication of incombustibility is displayed.

The present invention which operates as described above has a time chart as shown in the heating (strong) operation sequence of FIG. Here, the operation of the third solenoid valve 8 and the linear gas valve 9 is shown using the heating (strong) operation sequence as an example. The burner motor (BM) and the operation lamp are operated while the operation / stop switch is turned on. 1 second afterwards, the wind pressure switch is operated, and only the supply gas amount of the linear gas valve 9 is adjusted to a minimum at the initial ignition as shown in FIG. 5, and the first and second solenoid valves 7 and 10 and the linear gas valve 9 are operated. At this time, the linear gas valve 9 is in its worst state (step 103).

Subsequently, in step 105, pre-phage driving is performed for 30 seconds. When the pre-phage driving is performed, the second solenoid valve 10 is turned off, and the preliminary ignition (step 107) and the ignition detection (step 109) are performed back and forth on the basis of the off time so that the ignition transformer (not shown) is performed. The igniter IG is driven for 1 second and the frame sensor 1 second for driving for 2 seconds.

After the combustion is made, the combustion LED is turned on, and when the combustion starts, the linear gas valve 9 is operated weakly until the temperature of the warm air dummyster is higher than 50 ° C. Hold for seconds.

On the other hand, the fan motor FM is turned on when the temperature of the warm air dummyster is 50 ° C or higher, and when the temperature of the warm air dummyster is 50 ° C or more, the combustion state becomes weak and the linear gas valve 9 operates about. do.

After that, when the temperature of the warm air dummyster exceeds 50 ℃, the system operation is temporarily turned off, and the indoor dummyster is turned off. When the warm air temperature reaches 50 ℃ or lower, the indoor dummyster is turned on. Return to.

Then, when the user turns off the run / stop switch, the burner motor (BM), the wind pressure switch and the fan motor (FM) are driven for about 30 seconds until the temperature of the warm air dummyster is 40 ° C or lower. Then the system stops.

The fan motor (FM) is turned on when the temperature of the warm air dummyster after the initial operation is 50 ℃ or more and is controlled to strong / weak during ignition detection. Moreover, it turns out that the temperature of a warm air dummyster is 40 degrees C or less at the time of a driving off or a reset.

As described above, the present invention gradually increases the amount of gas when it is determined that the ignition is completed by minimizing the supply gas amount during initial ignition of the amount of supply gas flowing through the gas pipe, thereby increasing the amount of gas rising in the heat generating capacity of the heater. To prevent explosion noise caused by explosion during ignition, and to control the solenoid valve to keep the gas pressure flowing into the inlet and outlet of the linear gas valve at the same pressure, thereby preventing the vibration of the linear gas valve. Will be done.

Claims (2)

In the air-conditioning and gas heater control apparatus, a drive control means connected to a relay drive circuit 22 to control a solenoid valve, and the drive control means are connected in parallel with the linear gas valve 9 with respect to the same pipe. An apparatus for preventing initial ignition explosion of a gas heater, comprising a third valve means for blocking and maintaining the same gas pressure at the inlet and outlet. In the cooling / heating gas custom heater control device, the supply gas amount of the linear gas valve is minimized at the time of initial ignition, and the first and second solenoid valves 7 and the igniter IG after the preliminary holding period have elapsed. Turning on the preliminary ignition, turning off the second solenoid valve 10 and turning on the third solenoid valve 8, and turning off the igniter IG after the ignition detection period has elapsed. Method for preventing the initial ignition explosion of the gas heater consisting of the steps to the combustion phase.

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