CN219588993U - Igniter control circuit of low-nitrogen burner - Google Patents

Abstract

The igniter control circuit of the low-nitrogen burner comprises an igniter body, a power supply module, an air pressure sensor, a combustion detection circuit, a natural gas detection circuit, an air detection circuit and an alarm circuit, wherein the two sets of air pressure sensors are respectively arranged outside a natural gas inlet pipe of the burner and an air outlet pipe of a blower; the igniter body, the power module, the combustion detection circuit, the natural gas detection circuit, the air detection circuit and the alarm circuit are arranged in the element box and are electrically connected. After the novel stop burning, can combine natural gas detection circuitry, the air flow of air detection circuitry monitoring respectively and the air flow of air-blower input, only both just control the some firearm body and get the electricity to fire when satisfying the burning needs, reduced the unnecessary electric energy waste of some firearm body, after the combustor stops a period of time after burning, under alarm circuit effect, can be through the staff pinpointing out the reason that the warning of signaling sounder is no longer on-the-spot, guaranteed the normal work of heated equipment.

Description

Igniter control circuit of low-nitrogen burner

Technical Field

The utility model relates to the technical field of burner matching equipment, in particular to an igniter control circuit of a low-nitrogen burner.

Background

The industrial burner is a device used for boiler heating, metal heat treatment and other production. The low nitrogen burner (including the fuel burner and the gas burner, which are the same in nature and act on the boiler of the heating equipment by releasing heat energy through burning fuel) can fully reduce the content of nitrogen oxides discharged into the atmosphere exhaust gas, thereby reducing the pollution to the environment. The low-nitrogen burner for gas generally comprises a fan, an igniter, a burner body and a combustion hearth, wherein the front end of the burner body is positioned in the hearth, an air outlet pipe and a natural gas pipeline of the air blower are respectively connected with an air inlet pipe and a gas inlet pipe of the burner, and in application, the air blower is used for mixing air (entering a combustion head outer pipe of the burner) in the hearth with natural gas (entering the combustion head inner pipe of the burner) and the like (the two kinds of air are mixed and ignited at the front end of the combustion head), after the igniter ignites a fire (after an electric spark is generated by an ignition gun to ignite the gas, the ignition is automatically stopped), and the gas is combusted in the hearth to provide a heat source for a heated device (the ignition mode of the fuel burner is completely consistent with that of the gas burner).

Igniters have a relatively important role in burners, which relates to whether the burner can normally ignite. Current burner igniters suffer from structural limitations and more or less certain drawbacks. For example, patent number 202010180498.X in China and patent name "a low heat value gas burner and combustion technology" are issued, and specific embodiments of the utility model are recorded in that "before the utility model is used, the biomass gas burner body 1 is completely consistent with the existing biomass gas burner, the lower end of the front side of the hearth 6 of the boiler is installed, after the blower M is started, the blower M inputs air into the outer cylinder 101 of the burner body 1 through the air pipe 103, the biomass gas enters the outer cylinder 101 through the biomass gas pipe 102, the biomass gas and the air are synchronously sprayed out from the left front end of the outer cylinder 101 of the burner, and then are ignited by the ignition gun 5 (after the biomass gas is ignited, the ignition gun 5 is powered off). As is apparent from the above description, in accordance with the prior art, the ignition gun (igniter) has only the function of igniting fuel gas or the like at an initial stage in the furnace and igniting fuel gas or the like again after the ignition source is extinguished for various reasons in the subsequent furnace, but when the supply of natural gas (such as natural gas is stopped) or air (such as a blower or the like) is stopped due to the extinction of the ignition source in the furnace in the subsequent combustion, the igniter (the ignition gun and the burner are mounted together and the front end of the ignition head of the ignition gun is positioned on the front end of the burner) will ignite at intervals of a certain time or a continuous time, which will result in unnecessary electric energy waste and reduce the use of the igniter. Finally, the igniters of the prior art do not have the function of stopping combustion and alarming in the hearth, so that when a worker does not approach the burner, the worker cannot know the condition of stopping combustion, corresponding treatment cannot be performed, and the normal operation of heated equipment (such as a boiler) is adversely affected. In summary, it is particularly necessary to provide an igniter control circuit that can automatically detect whether the supply of air and natural gas is normal while the ignition source in the furnace is extinguished and ignited, prevent unnecessary ignition work, and prompt a relatively long-distance worker to perform disposal through an alarm when the combustion is stopped in the furnace.

Disclosure of Invention

In order to overcome the defects of the prior igniter applied to the burner, which are caused by the structure, the utility model provides an igniter body capable of continuously igniting after being electrified, and under the combined action of each mechanism and circuit, the igniter body can automatically monitor whether the fuel gas and air are normally supplied after stopping combustion under the combined action of each mechanism and circuit, and the igniter body is controlled to work and ignite when both the fuel gas and the air meet the combustion needs, and after a period of time after the burner stops combustion, staff on site can be stopped from finding out reasons through sounding of a sounder, so that the igniter control circuit of the low-nitrogen burner of which the normal work of heated equipment is ensured as much as possible.

The technical scheme adopted for solving the technical problems is as follows:

the igniter control circuit of the low-nitrogen burner comprises an igniter body, a power supply module and an air pressure sensor, and is characterized by further comprising a combustion detection circuit, a natural gas detection circuit, an air detection circuit and an alarm circuit, wherein the air pressure sensor comprises two sets, and the two sets of air pressure sensors are respectively arranged outside a natural gas inlet pipe of the burner and an air outlet pipe of a blower; the power module, the combustion detection circuit, the natural gas detection circuit, the air detection circuit, the alarm circuit and the igniter body are arranged in the element box; the signal output ends of the two sets of air pressure sensors are respectively and electrically connected with the signal input end of the air detection circuit and the signal input end of the natural gas detection circuit, and the power output end of the air detection circuit is electrically connected with the power input end of the igniter body; the triggering power supply output end of the combustion detection circuit is electrically connected with the triggering signal input end of the natural gas detection circuit and the triggering signal input end of the alarm circuit, and the triggering power supply input end of the air detection circuit is electrically connected with the triggering power supply output end of the natural gas detection circuit.

Further, the air inlet pipes of the two sets of air pressure sensors are communicated with the natural air inlet pipe and the air outlet pipe of the blower.

Further, the combustion detection circuit comprises a thermistor, an adjustable resistor, a resistor, an NPN triode and a relay which are electrically connected, wherein the thermistor is arranged in an outer cylinder of the burner, one end of the thermistor is connected with one end of the adjustable resistor and one end of the resistor, the other end of the thermistor is connected with an anode power input end of the relay and a control power input end, the other end of the resistor is connected with a base electrode of the NPN triode, a collector electrode of the NPN triode is connected with a cathode power input end of the relay, and the other end of the adjustable resistor is connected with an emitter electrode of the NPN triode.

Further, the natural gas detection circuit and the air detection circuit are consistent in structure and comprise an adjustable resistor, a resistor, an NPN triode and a relay which are electrically connected, one end of the adjustable resistor is connected with one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected with the base electrode of the NPN triode, the collector electrode of the NPN triode is connected with the negative power input end of the relay, and the other end of the second resistor is connected with the emitter electrode of the NPN triode.

Further, the thermistor is a positive temperature coefficient thermistor.

Further, the alarm circuit comprises a resistor, an electrolytic capacitor, an NPN triode, a relay and a sounder which are electrically connected, wherein the resistor, the electrolytic capacitor, the NPN triode, the relay and the sounder are connected through wiring of a circuit board, one end of the first resistor is connected with the positive power input end of the sounder, the other end of the first resistor is connected with one end of the second resistor and the positive electrode of the electrolytic capacitor, the other end of the second resistor is connected with the base electrode of the NPN triode, the collector electrode of the NPN triode is connected with the negative power input end of the sounder, and the negative electrode of the electrolytic capacitor is connected with the emitter electrode of the NPN triode.

Further, the power input end of the igniter body is electrically connected with a time control switch, and the power output end of the time control switch is respectively connected with the power input end of the igniter body.

The utility model has the beneficial effects that: the utility model discloses can continuous ignition's after the circular telegram some firearm body, the during operation, the combustion condition of combustor in the combustion chamber of combustion detection circuit can real-time supervision, after stopping burning, can combine natural gas detection circuit, the air flow of air detection circuit monitoring respectively and the air flow of air-blower input, only both just control some firearm body and get the electricity to fire when satisfying the burning needs, like this, the unnecessary electric energy waste of some firearm body has been reduced, and life has been improved correspondingly, and after the combustor stops a period of time after burning, under alarm circuit's effect, can pass through the sound prompt of signaling sounder no longer on-the-spot staff find out the reason, the normal work of the equipment of being heated has been guaranteed as far as possible. Based on the above, the utility model has good application prospect.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a schematic view of the overall structure of the present utility model mounted on a burner.

Fig. 2 is a circuit diagram of the present utility model.

Detailed Description

The igniter control circuit of the low-nitrogen combustor shown in fig. 1 and 2 comprises an igniter body DH (an igniter gun and 1 combustor 2 are installed together, the front end of an igniter head of the igniter gun 1 is positioned on the front end of the combustor 2, the power output end of the igniter body DH and the power input end of the igniter gun are connected through wires), a power module A1, air pressure sensors A2 and A, a combustion detection circuit 3, a natural gas detection circuit 4, an air detection circuit 5 and an alarm circuit 6, an inner thread screw hole is respectively arranged at the side end of a natural gas inlet pipe of the combustor 2 and the upper end of an air outlet pipe of the air blower 7, two sets of air pressure sensors A2 and A are respectively screwed into the inner threads of the screw holes at the upper ends of the natural gas inlet pipe and the air outlet pipe of the air blower 7 through the outer threads of the air inlet pipe, and are respectively installed outside the upper ends of the natural gas inlet pipe and the air outlet pipe of the air blower 7; the power module A1, the combustion detection circuit 3, the natural gas detection circuit 4, the air detection circuit 5, the alarm circuit 6 and the igniter body are arranged on a circuit board in the element box 8, and the element box 8 is arranged in the electric cabinet.

As shown in fig. 1 and 2, the air inlet pipes of the two sets of air pressure sensors A1 and a are communicated with the natural air inlet pipe and the air outlet pipe of the blower 7. The combustion detection circuit comprises a thermistor RT, an adjustable resistor RP, a resistor R2, an NPN triode Q1 and a relay K1 which are connected through circuit board wiring, wherein the thermistor RT is arranged at the inner rear part of an outer cylinder of the burner 2 (at the rear side end of a flame disk 9), a layer of heat insulation ceramic can be sealed and wrapped at the outer side end of the thermistor RT in order to prevent the thermistor RT from being heated too much, the temperature acting on the thermistor RT is lower, the temperature is specifically set according to actual production requirements, wires connected with the thermistor are respectively sleeved in an insulation ceramic tube and led out from the rear upper end of a cylinder of the burner in a sealing and insulating way, one end of the thermistor RT is connected with one end of the adjustable resistor RT and one end of the resistor R2, the other end of the thermistor RT is connected with the positive power input end and the control power input end of the relay K1, the other end of the resistor R2 is connected with the base of the NPN triode Q1, the collector of the NPN triode Q1 is connected with the negative power input end of the relay K1, and the other end of the adjustable resistor RP is connected with the emitter of the NPN triode Q1. The natural gas detection circuit comprises an adjustable resistor RP1, resistors R3 and R4, an NPN triode Q2 and a relay K2 which are connected through circuit board wiring, wherein one end of the adjustable resistor RP1 is connected with one end of a first resistor R4 and one end of a second resistor R3, the other end of the first resistor R4 is connected with a base electrode of the NPN triode Q2, a collector electrode of the NPN triode Q2 is connected with a negative power supply input end of the relay K2, and the other end of the second resistor R3 is connected with an emitter electrode of the NPN triode Q2. The air detection circuit comprises an adjustable resistor RP2, resistors R5 and R6, an NPN triode Q and a relay K which are connected through circuit board wiring, wherein one end of the adjustable resistor RP2 is connected with one end of a first resistor R6 and one end of a second resistor R5, the other end of the first resistor R6 is connected with a base electrode of the NPN triode Q, a collector electrode of the NPN triode Q is connected with a negative power input end of the relay K, and the other end of the second resistor R6 is connected with an emitter electrode of the NPN triode Q. The power supply module A1 is a finished product of a 220V-to-DC 12V switching power supply module with the model of 220V/12V/1 KW; thermistor RT is a positive temperature coefficient thermistor. The alarm circuit comprises resistors R7 and R8, an electrolytic capacitor C1, an NPN triode Q3 and a sounder B1 which are connected through circuit board wiring, wherein one end of the first resistor R7 is connected with the positive power input end of the sounder B1, the other end of the first resistor R7 is connected with one end of the second resistor R8 and the positive electrode of the electrolytic capacitor C1, the other end of the second resistor R8 is connected with the base electrode of the NPN triode Q3, the collector electrode of the NPN triode Q3 is connected with the negative power input end of the sounder B1, and the negative electrode of the electrolytic capacitor C1 is connected with the emitter electrode of the NPN triode Q3. The power input ends 1 and 2 pins of the igniter body DH are connected with a time control switch A3 through circuit board wiring, and the power output ends 3 and 4 pins of the time control switch A3 are respectively connected with the power input ends 1 and 2 pins of the igniter body DH.

As shown in fig. 1 and 2, the power input ends 1 and 2 pins of the power module A1 and the two poles of the ac 220V power supply are respectively connected by wires, the power output ends 3 and 4 pins of the power module A1 and the power input end relay K1 positive power input end and the NPN triode Q1 emitter of the combustion detection circuit, the power input end relay K2 positive power input end and the NPN triode Q2 emitter of the natural gas detection circuit, the power input end relay K positive power input end and the NPN triode Q emitter of the air detection circuit, and the power input ends 1 and 2 pins of the two sets of air pressure sensors A2 and a are respectively connected by wires; the other ends of the signal output end 3 pins of the two sets of air pressure sensors A and A2 and the signal input end adjustable resistor RP2 of the air detection circuit and the signal input end adjustable resistor RP1 of the natural gas detection circuit are respectively connected through wires, and the normally open contact end of the power output end relay K of the air detection circuit and the 1 pin and the 2 pin of the time control switch A3 of the power input end of the NPN triode Q emitter and the igniter body are respectively connected through wires; the normally open contact end of a trigger power supply output end relay K1 of the combustion detection circuit and the normally open contact end of a trigger power supply output end relay K2 of the natural gas detection circuit are connected through a lead, and the positive power supply input end of a trigger signal input end alarm B1 of the alarm circuit is connected with the 4 pins of a power supply module A1 through a lead.

Fig. 1 and 2 show, the utility model discloses an igniter body DH based on can continuous ignition after the circular telegram, during operation, action ignition rifle produces the electric spark after the circular telegram of igniter body DH and ignites the air and natural gas mixed gas that get into in the furnace, and the gas burns in the furnace and provides the heat source for the equipment that is heated (after burning waste gas is discharged through the flue). In the utility model, after 220V alternating current power enters the power input end of the power module A1, the 3 and 4 pins of the power module A1 output stable direct current 12V power and enter the power input ends of the combustion detection circuit, the natural gas detection circuit and the air detection circuit, and the circuits are electrified to work. In the combustion detection circuit, when the temperature in the hearth is higher than a certain time (for example, the temperature is higher than about 800 ℃, because of the interval distance between the thermistor RT and the inner flame in the hearth and because of the wind force effect blown out from the front end of the burner body, the temperature acted on the heating surface of the thermistor RT at the moment is only about 200 ℃ and the heating degree of the thermistor RT is relatively high, and the resistance value is relatively high, so that the 12V power supply is divided by the thermistor RT and the adjustable resistor RP (in actual production, the voltage is increased when the resistance value of the adjustable resistor RP is regulated to be larger by technicians), in actual application, the temperature in the hearth is relatively high, the voltage of the thermistor RT is relatively large, the NPN triode Q1 is conducted, namely, the novel temperature detection threshold is increased when the resistance value of the adjustable resistor RP is regulated to be smaller, the NPN triode Q1 is conducted in actual application, the specific threshold is regulated by technicians according to requirements, the specific threshold is reduced in the voltage, the temperature is reduced, the NPN triode Q1 enters the base electrode Q1, and the base electrode Q1 is not conducted after the triode Q1 is not conducted, and the triode Q1 is not conducted after the triode Q1 is not conducted. When the ignition is not performed in the hearth, or the burner 2 stops burning due to various reasons (such as a period of natural gas cut-off or a period of fan power failure), the temperature in the hearth is lower than a certain period (for example, lower than about 800 ℃), the heating degree of the thermistor RT is relatively small, and the resistance value is relatively small, so that the voltage of a 12V power supply is divided by the thermistor RT and the adjustable resistor RP, the voltage and the current of the resistor R2 are reduced and limited, the voltage of the base electrode of the NPN triode Q1 is higher than 0.7V, the conduction collector of the NPN triode Q1 outputs a low level to enter the negative power supply input end of the relay K1, the relay K1 can be electrified to attract the control power supply input end and the normally open contact end to be closed, and a foundation is laid for the electric work of the igniter body DH of the subsequent stage.

In the natural gas detection circuit shown in fig. 1 and 2, when natural gas is not stopped, the pressure in the air inlet pipe of the air pressure sensor A2 is relatively large, the voltage signal output by the 3 pin of the air pressure sensor A2 is divided by an adjustable resistor RP1 and a resistor R3 (in actual production, the voltage is larger when the resistance value of the adjustable resistor RP1 is regulated to be larger by a technician, then in actual application, the natural gas quantity is relatively large, the voltage of the resistor R3 is relatively small, an NPN triode Q2 is conducted, that is, the novel air pressure detection threshold is larger, the pressure is smaller when the resistance value of the adjustable resistor RP1 is regulated to be smaller by the technician, the natural gas pressure is relatively low, the voltage of the resistor R3 is relatively large, that is, the novel air pressure detection threshold is smaller, the specific detection threshold technician sets the voltage is set as required, the base voltage of the NPN triode Q2 after the voltage is reduced and limited, the base voltage of the NPN triode Q2 is higher than 0.7V, the low-level output of the NPN triode Q2 enters the power supply K2, the negative electrode of the power supply K2 is conducted by the igniter, the normally-open relay is conducted by the normally-open type power supply input end of the normally-open type igniter, the normally-open type power supply K2 is conducted by the normally-open type power supply control contacts, and the normally-open power supply contacts enter the normally-open power supply contacts and the normally-open power supply contacts enter the normally-open power supply contacts and the normally-open power supply circuit 1 and the normally-open power supply circuit. In practical situations, when natural gas is stopped or the air pressure is very low and can not meet the combustion condition of the burner, the air pressure entering the air inlet pipe of the air pressure sensor A2 is relatively low, the voltage signal output by the 3 pin of the air pressure sensor A2 is divided by the adjustable resistor RP1 and the resistor R3, the voltage of the base electrode of the NPN triode Q2 is lower than 0.7V after the voltage is reduced and limited by the resistor R4, the NPN triode Q2 can not conduct the collector and not output low level to enter the negative electrode power supply input end of the relay K2, the relay K2 can not be electrified to attract the control power supply input end and the normally open contact end of the relay K2 to be opened, and then the igniter body DH of the subsequent stage can not work electrically even if the burner stops burning.

In the air detection circuit shown in fig. 1 and 2, when the air blower normally works and the air pressure in the air inlet pipe of the air pressure sensor A is relatively large, the voltage signal output by the 3 pin of the air pressure sensor A is divided by an adjustable resistor RP2 and a resistor R5 (in actual production, a technician adjusts the resistance value of the adjustable resistor RP2 to be larger, the voltage is larger when the resistance value is larger, in actual application, the air pressure is relatively high, the resistor R5 is divided relatively small, the NPN triode Q is conducted, namely the novel air pressure detection threshold value is increased; in practical situations, when the blower stops working or the air pressure is very low and can not meet the combustion condition of the burner, the air pressure entering the air inlet pipe of the air pressure sensor A is relatively low, the voltage signal output by the 3 pin of the air pressure sensor A is divided by the adjustable resistor RP2 and the resistor R5, the voltage and the current of the resistor R6 are reduced and limited, the voltage entering the base electrode of the NPN triode Q is lower than 0.7V, the NPN triode Q can not conduct the collector and not output low level to enter the negative electrode power supply input end of the relay K, the relay K can not be electrified to attract the control power supply input end and the normally open contact end of the relay K to open, and then the igniter body DH of the later stage can not work even if the burner stops burning. When the burner stops burning (the temperature in the hearth is reduced) and natural gas and air are normally supplied, after the time control switch A3 is powered on, the 3 and 4 pins of the time control switch A3 can output power for a certain time at intervals (for example, after 10 seconds of power is output, then 10 seconds of Zhong Dianyuan are output at intervals of 10 seconds) to the power input end of the igniter body DH, and after the igniter body DH is powered on, the igniter body DH can be cycled to enable the igniter gun to generate electric sparks to ignite mixed gas in the hearth at intervals of 10 seconds (multiple ignition guarantees successful ignition). When ignition is successful, the temperature in the hearth rises again, the heated temperature of the thermistor RT becomes higher again, the resistance value becomes relatively large again and the voltage division is large, so that the relay K1 loses power again, the 12V power supply does not enter the control power supply input end of the relay K1, the relay K2 at the later stage controls the power supply input end to lose power, and the igniter body DH loses power and does not ignite.

In fig. 1 and 2, after combustion is stopped in a hearth, a relay K1 is powered on, and an alarm circuit is powered on, a 12V positive power supply is subjected to voltage-reducing and current-limiting through a resistor R7 to charge an electrolytic capacitor C1, and in the beginning 40 seconds (time is adjustable, time is equal to 1.1 of the resistance value of a capacitor C1 capacity of a resistor R7), when the electrolytic capacitor C1 is not fully charged, the 12V power supply is subjected to current-limiting and voltage-reducing through resistors R7 and R8, and enters an NPN triode Q3 with a base lower than 0.7V, the NPN triode Q3 is in a cut-off state, and a subsequent alarm B does not sound; after 40 seconds, when the electrolytic capacitor C1 is fully charged, a 12V power supply is subjected to current-limiting and voltage-reducing through the resistors R7 and R8, the base electrode of the NPN triode Q3 is higher than 0.7V, the NPN triode Q3 is in a conducting state, then the collector electrode of the NPN triode Q3 outputs low level to enter the negative power supply input end of the signaling sounder B1, the signaling sounder B1 is electrified to send out a sounding prompt sound, and combustion is stopped in a hearth of a worker in a certain range nearby the signaling sounder. Through above-mentioned mechanism and circuit combined action, during operation, the combustion detection circuit can real-time supervision burner's in the furnace combustion condition, after stopping burning, can combine natural gas detection circuit, the air flow of air detection circuit monitoring respectively and the air flow of air-blower input, only both just control the igniter body and get the electrical ignition when satisfying the burning needs, so, unnecessary electric energy waste of igniter body has been reduced, and life has been improved correspondingly, and after the combustor stops a period of time after burning, under alarm circuit's effect, can be through the sound prompt of signaling sounder no longer on-the-spot staff find out the reason, the normal work of firing equipment (such as boiler) has been guaranteed as far as possible. As shown in FIG. 2, the power supply module A1 is a finished product of a 220V/12V/1KW alternating current 220V-to-12V direct current switching power supply module, and the power is 200W. The resistances of the resistors R2, R3, R4, R5, R6, R7 and R8 are respectively 47K, 10.5K, 47K, 12K, 47K, 3.6M and 470K; thermistor RT is a positive temperature coefficient thermistor of the model EPCOS; model number Q1, Q2 and Q, Q3 of NPN triode is 9013; the types K1, K2 and K of the relays are DC12V; the sounder B1 is a finished product of the continuous acoustic sounder with the model DC12FM (prior art); the air pressure sensors A1 and A are finished pressure transmitter products (prior art) of model KE-240, and are provided with two power input ends and one signal input end, wherein the signal output ends can output 0-5V voltage signals which dynamically change when in operation; the adjustable resistors RP, RP1, RP2 are 470K (the embodiment is adjusted to 28.7K, 16.3K, 17.2K); the igniter body DH is an electronic igniter finished product of model FW5JF (prior art); the time control switch A3 (prior art) is a full-automatic microcomputer time control switch finished product of a model KG316T, the microcomputer time control switch is provided with seven keys for canceling/recovering, timing, calibrating, checking weeks, automatic/manual, timing and clocking, and is provided with two power input ends 1 and 2 pins, two power output ends 3 and 4 pins, and a user can set the interval time of the power output ends outputting power and the time of outputting power each time by respectively pressing and operating the seven keys; the capacitor C1 type is 10 muF/25V.

It should be understood by those skilled in the art that although the present disclosure describes embodiments, the embodiments do not include only a single embodiment, and the description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the embodiments in the examples may be combined appropriately to form other embodiments that can be understood by those skilled in the art, so that the scope of the present disclosure is defined by the claims.

Claims (7)

1. The igniter control circuit of the low-nitrogen burner comprises an igniter body, a power supply module and an air pressure sensor, and is characterized by further comprising a combustion detection circuit, a natural gas detection circuit, an air detection circuit and an alarm circuit, wherein the air pressure sensor comprises two sets, and the two sets of air pressure sensors are respectively arranged outside a natural gas inlet pipe of the burner and an air outlet pipe of a blower; the power module, the combustion detection circuit, the natural gas detection circuit, the air detection circuit, the alarm circuit and the igniter body are arranged in the element box; the signal output ends of the two sets of air pressure sensors are respectively and electrically connected with the signal input end of the air detection circuit and the signal input end of the natural gas detection circuit, and the power output end of the air detection circuit is electrically connected with the power input end of the igniter body; the triggering power supply output end of the combustion detection circuit is electrically connected with the triggering signal input end of the natural gas detection circuit and the triggering signal input end of the alarm circuit, and the triggering power supply input end of the air detection circuit is electrically connected with the triggering power supply output end of the natural gas detection circuit.

2. The igniter control circuit of the low nitrogen burner of claim 1 wherein the inlet pipe of the two sets of air pressure sensors are in communication with the inlet pipe of the natural gas pipe and the outlet pipe of the blower.

3. The igniter control circuit of the low nitrogen burner according to claim 1, wherein the combustion detection circuit comprises a thermistor, an adjustable resistor, a resistor, an NPN triode and a relay which are electrically connected, the thermistor is arranged in an outer cylinder of the burner, one end of the thermistor is connected with one end and one end of the adjustable resistor, the other end of the thermistor is connected with a positive power input end and a control power input end of the relay, the other end of the resistor is connected with a base electrode of the NPN triode, a collector electrode of the NPN triode is connected with a negative power input end of the relay, and the other end of the adjustable resistor is connected with an emitter electrode of the NPN triode.

4. The igniter control circuit of the low nitrogen burner of claim 1, wherein the natural gas detection circuit and the air detection circuit are identical in structure and comprise an adjustable resistor, a resistor, an NPN triode and a relay which are electrically connected, one end of the adjustable resistor is connected with one end of the first resistor, one end of the second resistor, the other end of the first resistor is connected with a base electrode of the NPN triode, a collector electrode of the NPN triode is connected with a power input end of a negative electrode of the relay, and the other end of the second resistor is connected with an emitter electrode of the NPN triode.

5. The igniter control circuit of a low nitrogen burner of claim 1 wherein the thermistor is a positive temperature coefficient thermistor.

6. The igniter control circuit of the low nitrogen burner of claim 1 wherein the alarm circuit comprises a resistor, an electrolytic capacitor, an NPN triode, a relay and a squealer electrically connected to each other through wiring of a circuit board, wherein one end of the first resistor is connected to a positive power input end of the squealer, the other end of the first resistor is connected to one end of the second resistor and to a positive electrode of the electrolytic capacitor, the other end of the second resistor is connected to a base electrode of the NPN triode, a collector electrode of the NPN triode is connected to a negative power input end of the squealer, and a negative electrode of the electrolytic capacitor is connected to an emitter electrode of the NPN triode.

7. The igniter control circuit of claim 1 wherein the igniter body has a power input electrically connected to a time switch, the power output of the time switch being connected to the igniter body at the power input.