KR100254099B1 - Combustion control circuit - Google Patents

Abstract

PURPOSE: A circuit for controlling burning is provided to reduce a loading current in the beginning of ignition by suing a power circuit which converts AC from a battery or a general power source to DC, thereby preventing the rapid reduction of battery utilization. CONSTITUTION: A circuit for controlling burning includes a valve opening circuit(23) for forcibly opening an electronic safety valve(14) by electromagnetic force to reduce a maximum loading current, a maintenance circuit(24) for maintaining the opened state of the electronic safety valve, an ignition circuit(25) for igniting a burner and a frame rod circuit(26) for detecting the firing of the burner with a frame rod and maintaining the electronic safety valve in the opened state when the burner is firing, wherein the valve opening circuit operates for a first time period and simultaneously the maintenance circuit and the ignition circuit operates for a second time period for ignition, and the operation of the frame rod circuit is initiated as the operation of the valve opening circuit is finished, the first time period being set shorter than the second time period.

Description

Combustion control circuit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control circuit using a power source circuit for converting alternating current into direct current from a battery applied to a combustor such as a scorching machine and a commercial power source.

In general, the combustor is equipped with an electronic safety valve in the fuel supply path of the burner as a safety measure at the time of fire, forcibly changes the electronic safety valve during the ignition operation, and burner ignition is detected in the thermocouple and frame rod. While the electronic safety valve is held in an open state, the suction valve is held in an open state and the electronic safety valve is closed at the time of fire to prevent the release of unburned gas.

As described above, there are two methods of forcibly changing the electromagnetic safety valve: a mechanical type that is modified by using an operator's operating force, and an electrical system that is modified by an electromagnetic force by applying a large current to the electromagnet of the electromagnetic safety valve.

In the case of adopting the electric method, an ignition circuit for igniting the burner in the combustion control circuit, a remodeling circuit forcibly opening the electronic safety valve, a holding circuit for holding and holding the electronic safety valve in the modified state, and a burner An ignition detection circuit for detecting ignition is provided, the ignition circuit is operated for a predetermined time during the ignition operation, and the actuating circuit is operated for a short time at the beginning of the ignition operation to forcibly change the electronic safety valve. By the signal, the operation of the holding circuit and the electronic safety valve are changed and held until the electronic safety valve is held in the open state.

In the above case, if the thermocouple is used as the ignition detection circuit, it takes time until the predetermined electromotive force is generated from the thermocouple. Therefore, the electronic safety valve will not be changed and held by the holding circuit until the preheating time has elapsed. If the burner is not ignited during operation of the ignition circuit, unburned gas is released.

On the contrary, if the ignition detection circuit is constituted by the frame rod circuit which detects the burner ignition by using the frame rod, the ignition circuit can be detected immediately by detecting the burner ignition and holding the electronic safety valve in the modified state. The operation of the holding circuit can be terminated and the discharge of unburned gas due to the ignition miss can be reliably prevented.

In addition, the manganese battery generally used as a power battery for a combustion control circuit has a change in utilization rate due to the load current as shown in FIG. The utilization rate is statistically different depending on individual batteries. In FIG. 5, the line a indicates the characteristics of the battery with the highest utilization rate, the line b shows the characteristics of the battery with the lowest utilization rate, and when the load current exceeds 500 mA, the utilization rate, that is, the variation of the battery life, is rapidly increased. .

As described above, when the switching circuit and the frame load circuit forcibly modifying the electronic safety valve by the electromagnetic force are provided, the load current of the ignition circuit overlaps with each other, and a large load current flows at the beginning of the ignition operation, and the utilization rate of the battery rapidly decreases. As a result, the battery life is shortened, and the battery is consumed before the designated replacement period of the battery, causing inconvenience to the user.

In addition, even when a power supply circuit that changes AC from a commercial power source to a direct current source is used as a power supply for a combustion control circuit, the rated amount of the transformer and silicon bridge components constituting the power supply circuit can cope with a large load current of the initial ignition operation. It is necessary to configure a large part of the device, and therefore, the size of the device and the cost increase.

In view of the above problems, the present invention aims to reduce the load current of the initial ignition operation so that the above problems do not occur.

In order to solve the above problems, the present invention provides a combustion control circuit using a power supply circuit for converting alternating current into direct current from a battery or a commercial power supply, the ignition circuit for igniting a burner and the electronic safety provided in the fuel supply path of the burner. The open circuit forcibly opening and closing the valve by electromagnetic force, the holding circuit holding and holding the electronic safety valve in the open state, and the burner's ignition detected by using the frame rod. A frame rod circuit for holding suction; During the ignition operation, the open circuit is operated for a first set time, and at the same time, the ignition circuit and hold circuit are operated for a second set time longer than the first set time, and the frame rod circuit is operated when the open circuit is finished. It characterized in that to disclose.

By delaying the start time of the frame load circuit to the end time of the opening circuit as described above, it is possible to lower the large load current of the initial ignition operation to an appropriate level of 500 mA or less. Therefore, according to the present invention, when the battery is used as a power source for the combustion control circuit, it is possible to reduce the variation in the lifespan according to the individual difference of the battery, and as a result, the battery is extinguished before the designated replacement period of the battery. It is possible to prevent the occurrence of the problem described as an inconvenience to the user.

In addition, even when a power supply circuit for converting AC from a commercial power supply into a direct current is used as the power supply for the combustion control circuit, components such as transformers and silicon bridges constituting the power supply circuit can be used in a small size of the rated amount. As a result, the device can be miniaturized and costs can be reduced.

1 is a front view of an example of an apparatus for applying the present invention.

2 is a schematic cross-sectional view of a gas valve unit installed in a water purifier.

3 is a block diagram of an example of the present invention.

5 is a block diagram showing another embodiment in which the power source is changed.

* Explanation of symbols for main parts of the drawings

2: burner 14: electronic safety valve

20: frame load 23: modified circuit

24: holding circuit 25: ignition circuit

26: frame load circuit 31: battery

32: commercial power supply 33: power supply circuit

As shown in FIG. 1, the embodiment to which the present invention is applied to the combustion control circuit of the scorching machine 1 will be described.

The water purifier 1 includes a gas burner 2 and a heat exchanger 3 using the gas burner 2 as a heat source, and is further connected to a water valve unit connected to the water pipe joint 4 at the lower end ( 5) and a gas valve unit 7 connected to the lower end gas joint 6.

On the downstream side of the water-based valve unit 5, a heat passage 8 and a bypass channel 9 passing through the heat exchanger 3 are connected, and a downstream end of the heat passage 8 and a bypass channel ( The downstream end of 9) is joined by the mixing section 10 provided at the lower center portion of the water mixer 1, and the tapping head 11 is connected to the mixing section 10 in connection with the flexible pipe.

The water-based valve unit 5 performs a water supply operation by pressing the operator 13, and adjusts the amount of water passing through the channels 8 and 9 by the rotation operation of the operator 13. The structure is not particularly different from those of the prior art. The detailed description is omitted.

As shown in FIG. 2, the gas-based valve unit 7 has a rod interlocked with the solenoid safety valve 14 and the water regulator installed in the water-based valve unit 5 in order from the upstream side. The hydraulic pressure regulating valve 15, the gas governor 16, and the operation lever 17a on the front of the water purifier 1 are geared to The gas amount adjusting valve 17 is provided via 17b).

When the operator 13 presses and passes the water, the pressure-reactive valve 15 is modified and at the same time, the switch 18 interlocking with the protrusion 18a on the rod 15a is turned on by the movement of the protrusion 18a. As described later, the electromagnetic safety valve 14 is modified, and gas is supplied to the burner 2 to ignite.

The scrubber 1 is provided with a spark plug 19, a frame rod 20, and a flame detection thermocouple 21, facing the burner 2, and then scattered so as to face the heat exchanger 30 again. The detection thermocouple 22 is provided.

3 shows a combustion control circuit, the power source of which is constructed from the battery 31. Here, the first coil 14a having a small resistance value and the second coil 14b having a large resistance value are wound around the electromagnet of the electromagnetic safety valve 14. Then, the opening circuit 23 which energizes the first coil 14a of the combustion control circuit and forcibly opens the electromagnetic safety valve 14 by the electromagnetic force, and the second safety coil 14b which energizes the second coil 14b. ) Is provided with a holding circuit 24 for holding and holding in a modified state.

In addition, the combustion control circuit includes an ignition circuit 25 for causing spark discharge in the spark plug 19, a frame rod circuit 25 for detecting ignition of the burner 2 from a current flowing in the frame rod 20, A siliceous fault detection circuit 27 for inputting electromotive force from the two thermocouples 21 and 22 connected in reverse polarity to each other is provided. Here, the frame rod circuit 26 outputs a high level signal when the current is flowing in the frame rod 20, that is, when the ignition occurs, and when the current does not flow in the frame rod 20, that is, when it is misfired. Outputs a low-level signal. In addition, when the electromotive force input thereto is equal to or greater than a predetermined ignition discrimination value, the misfire detection circuit 27 outputs a high level signal, and when the electromotive force of the thermocouple 21 decreases due to misfire of the burner 2, When the thermocouple 22 is heated by the lift up of the burner flame, the electromotive force of the thermocouple 21 is canceled by the electromotive force of the thermocouple 22, and the low level when the input electromotive force becomes lower than the predetermined siliceous fault discrimination value. Outputs the signal of.

In addition, three timers 28 ₁ , 28 ₂ , and 28 ₃ are provided in the combustion control circuit from the first to the third, which start the time operation from the time when the switch 18 is turned on. have. A first timer (28 ₁₎ is a predetermined first set time from the on-time of the switch 18; to output a high level signal during the (T _1, for example 0.4 seconds), the first timer circuit (28 ₁₎ In response to the high level output signal from the switching circuit 23, the opening circuit 23 is energized and the electromagnetic safety valve 14 is forcibly opened by energizing the first coil 14a.

The second timer circuit 28 ₂ receives a high level signal for a second set time T ₂ (for example, 0.8 seconds) set longer than a predetermined first set time T ₁ from the time when the switch 18 is turned on. By outputting, the ignition circuit 25 is operated in accordance with the high level output signal from the second timer circuit 28 ₂ , the holding circuit 24 is operated, and the second coil 14b is energized. The safety valve 14 is held in a modified state by suction.

A third timer (28 ₃₎ has a third setting time corresponding to the heating latency of the thermocouple 21 from the on-time of the switch 18; to output a high level signal during the (T _3, for example 30 seconds) , and the output signal from the third timer circuit (28 ₃₎ to the aND circuit 29.

The AND circuit 29 is inputted with the NOT circuit 30 interposed between the signals output during the operation of the switching circuit 23, so that the operation of the switching circuit 23 is terminated and the signals from the NOT circuit 30 are terminated. When the signal reaches the high level, the signal of the high level is output from the AND circuit 29 until the third set time T ₃ elapses, and the frame load circuit 26 is operated according to the output signal. have.

See circuit 24, the second timer circuit (28 ₂₎ in addition to the output signal in the output signal of the frame to load circuit 26 and the chamber volcanic defect detection circuit 27 is input to each of the circuits 26 of the ( Even when a high level signal is output from 27, the holding circuit 24 is operated to energize the second coil 14b.

According to the above arrangement, when the channel 18 is switched on by the ignition operation, that is, the pressing operation of the operator 13, as shown in FIG. The switching circuit is operated by T ₁ ) and the holding circuit 24 and the ignition circuit 25 are operated by the second set time T ₂ , and the electromagnetic safety valve 14 is forcibly modified by the electromagnetic force. The adsorption is held in the state, and the burner 2 is ignited. Then, when the operation of the opening and closing circuit 23 ends when the first setting time T ₁ elapses, the operation of the frame rod 26 is started, and if the burner 2 is ignited, the second setting time T Even after ₂ elapses, the holding circuit 24 continues to operate according to the signal from the frame load circuit 26, and combustion of the burner 2 is continued. Although not shown in FIG. 4, the required electromotive force is generated from the thermocouple 21 before the operation of the frame load circuit 26 ends after the third set time T ₃ elapses from the on time of the switch 18. After the third set time T ₃ has elapsed, the holding circuit 23 is operated by the signal from the misfire detection circuit 27 and the combustion of the burner 2 is continued.

Here, the load current of the opening circuit 23 is about 410 mA, the load current of the holding circuit 24 is about 6 mA, the load current of the ignition circuit 25 is about 80 mA, the load of the frame load circuit 26. The current is about 20 mA. If all of these circuits 23, 24, 25, and 26 are operated when the switch 18 is on, the maximum load current is 516 mA, but in the present embodiment, the operation of the switching circuit 23 is performed. Since the operation of the frame load circuit 26 is started by the end, the maximum load current is 496 mA.

As described above, since the maximum load current is less than 500 mA, the variation due to individual differences in the battery shown in FIG. 5 can be suppressed so as to be small, and thus the battery is consumed before the designated replacement period of the battery. The above problem described as inconvenience to the user does not occur.

Further, in the above embodiment, combustion is performed using a battery as a power source of the combustion control circuit or a power source circuit 33 for converting alternating current from the commercial power source 32 into direct current as shown in FIG. The control circuit can also be configured as described above. As a result, the maximum load current is reduced to 500 mA or less as described above. Therefore, it is recommended to use a small component of the rated amount in the components such as the transformer and the silicon bridge constituting the power circuit. It is possible to reduce the size and cost of the equipment.

Claims (2)

In a combustion control circuit using a battery as a power source, an ignition circuit for igniting the burner, an open circuit forcibly opening the electronic safety valve opened in the fuel supply path of the burner, and an electronic safety valve in the open state. A holding circuit for holding suction and a frame rod circuit for detecting ignition of the burner using the frame rod and holding and holding the electronic safety valve in a modified state when the burner is ignited; During the ignition operation, the switching circuit is operated for the first set time and the ignition circuit and the holding circuit are operated for a second set time longer than the first set time. Combustion control circuit, characterized in that to start the operation. In a combustion control circuit using a power supply circuit for converting AC from a commercial power source into a direct current, a ignition circuit for igniting the burner and an electronic safety valve forcibly modified by an electromagnetic force in the burner fuel supply passage. Circuit, holding circuit for holding and holding the electronic safety valve in the open state, and frame rod circuit for detecting the burner's ignition by using the frame rod and holding and holding the electronic safety valve in the open state when the burner is ignited. ; During the ignition operation, the open circuit is operated for a first set time and at the same time, the ignition circuit and hold circuit are operated for a second set time longer than the first set time, and the frame rod circuit is operated when the open circuit is finished. Combustion control circuit, characterized in that to initiate.

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