KR19990027491A - Ignition Method of Gas Boiler - Google Patents

Abstract

The present invention relates to a ignition method of a gas boiler, and more particularly, a gas for preventing ignition failure generated during an initial ignition stroke for combustion in a burner of a gas boiler and stably achieving ignition in the burner. It relates to a ignition method of the boiler.

The ignition method of the gas boiler according to the present invention includes a microcomputer 26 having a program for controlling the entire stroke and a gas valve for adjusting the gas consumption supplied to the burner 28 in accordance with a control signal from the microcomputer 26. (4), an igniter 22 for igniting the gas supplied to the burner 28, a salt voltage detector 12 for detecting ignition achievement, and an exhaust fan for discharging waste gas generated by combustion In the gas boiler which includes (14) and proportionally controls the gas valve (4) and the exhaust fan (14), when the boiler operation command is input to the microcomputer (26), the gas valve (4) to the initial gas supply state A first step of controlling and supplying gas to the burner 28, outputting a high voltage to the igniter 22, and operating the exhaust fan 14 in an initial setting state to perform ignition stroke; A second step of judging by the microcomputer 26 using a signal input from the salt voltage detection unit 12 whether ignition at the burner 28 has been achieved; A third step of performing proportional control according to a set temperature while performing combustion stroke when ignition is normally achieved; If the ignition has not been achieved, the operation voltage v of the exhaust fan 14 is decreased by one step to reduce the air volume, and the operation current s of the gas valve 4 is increased by one step to increase the amount of gas. Step 4; And a fifth step of performing the ignition stroke in the microcomputer 26 according to the operation data of the exhaust fan 14 and the gas valve 4 set in the fourth step.

Description

Ignition Method of Gas Boiler

The present invention relates to a ignition method of a gas boiler, and more particularly, a gas for preventing ignition failure generated during an initial ignition stroke for combustion in a burner of a gas boiler and stably achieving ignition in the burner. It relates to a ignition method of the boiler.

As gas boilers use clean fuel gas, pollutant emission is reduced, and because it is easier to handle than oil-use boilers, the use in homes is gradually increasing. Various types of such gas boilers are sold on the market, and most boilers supply ignition gas to fuel a burner and generate sparks using an igniter.

First, the operating state of the boiler will be described with reference to FIGS. 1 to 2 as follows.

1 is a configuration example of a conventional gas boiler, a flow switch (2) for detecting the supply of direct water (cold water) when using hot water, a gas valve (4) installed in the middle of the gas pipe for supplying LNG or LPG, gas Burner 28 for combusting the gas passed through the valve 4, igniter 22 for igniting the gas supplied to the burner 28, salt voltage for detecting the ignition and combustion state in the burner 28 Exhaust hood for guiding exhaust gas passing through the heat exchanger 30 and the heat exchanger 30 for heating the heating water by the high temperature heat rising after being burned by the sensing unit 12 and the burner 28. (32), an exhaust fan (14) attached to the upper end of the exhaust hood (32) for forcibly discharging the exhaust gas, a return pipe (40) for inducing heating water to the heat exchanger (30), and a heat exchanger (30). Supply pipe (38) for discharging the heating water heated in the, three-way (36), for controlling the flow path of the heating water, egg Such as a water tank 34 for supplement the number is shown. In addition, as shown in Figure 2, the microcomputer 26 is a boiler operation control program is built in to control the boiler by controlling a plurality of electrical appliances connected in accordance with the user's command signal.

In the conventional gas boiler configured as described above, when the user presses a specific command button installed in the room cone 24 to use the boiler operation command, for example, the heating mode or the hot water mode, the microcomputer 26 burner according to the input signal. In (28), heating is performed while the combustion stroke is performed or hot water is supplied. Conventionally, the exhaust fan 14 is controlled to rotate at the set rotational speed while supplying a set gas amount by opening the gas valve 4 to ignite the burner 28. The initial gas amount and the exhaust fan rotation speed are determined at the time of design and are determined to satisfy the optimum ignition condition.

However, when the ignition fails in the burner 28 due to an external factor, for example, an inflow of air or air movement from the room, the microcomputer 26 fixes the gas valve 4 with the exhaust fan rotational speed fixed. Ignition stroke was performed after resetting the initial gas supply and rotational speed by increasing the amount of gas supplied through the air) or by lowering the exhaust fan speed and fixing the amount of gas supplied through the gas valve (4). Since the method was set in consideration of only one ignition disturbance factor (gas amount or exhaust fan rotation speed), the ignition failure probability was high.

The present invention has been made to solve the above problems, the object of the present invention is to prevent the ignition failure occurring during the initial ignition stroke for combustion in the burner of the gas boiler and to stably ignite the burner It is to provide a ignition method of the gas boiler to achieve.

The ignition method of the gas boiler of the present invention for achieving the above object is a gas supplied to the burner 28 in accordance with a microcomputer 26 with a program for controlling the entire stroke and a control signal from the microcomputer 26. A gas valve 4 for adjusting consumption, an igniter 22 for igniting the gas supplied to the burner 28, a salt voltage detector 12 for detecting ignition achievement, and waste gas generated by combustion In the gas boiler which includes an exhaust fan 14 for discharging gas and proportionally controls the gas valve 4 and the exhaust fan 14, when the boiler operation command is input to the microcomputer 26, the gas valve 4 is provided. A first step of controlling the gas to an initial gas supply state to supply gas to the burner 28, to output a high voltage to the igniter 22, and to operate the exhaust fan 14 to an initial setting state to perform ignition stroke; A second step of judging by the microcomputer 26 using a signal input from the salt voltage detection unit 12 whether ignition at the burner 28 has been achieved; A third step of performing proportional control according to a set temperature while performing combustion stroke when ignition is normally achieved; If the ignition has not been achieved, the operation voltage v of the exhaust fan 14 is decreased by one step to reduce the air volume, and the operation current s of the gas valve 4 is increased by one step to increase the amount of gas. Step 4; And a fifth step of performing the ignition stroke in the microcomputer 26 according to the operation data of the exhaust fan 14 and the gas valve 4 set in the fourth step.

1 is a schematic configuration diagram of a gas boiler conventionally used;

FIG. 2 is a schematic block circuit diagram of the gas boiler of FIG. 1;

3 is a table showing a set state of a gas valve current value and a fan voltage value;

4 is a flow chart illustrating the method of the invention.

Explanation of symbols for the main parts of the drawings

2: flow valve, 4: gas valve,

6: fan rotation speed detection unit, 8: water level detection unit,

10: temperature detection unit, 12: salt voltage detection unit,

14: exhaust fan, 16: power supply,

18: automatic refill water valve, 20: circulation pump,

22: igniter, 24: room cone,

26: micom, 28: burner,

30: heat exchanger, 32: exhaust hood,

34: water tank, 36: triangulation,

38: supply pipe, 40: return pipe.

Hereinafter, the ignition method of the gas boiler of the present invention will be described in detail with reference to the accompanying drawings.

The method of the present invention is a method for solving the ignition failure occurring during the ignition stroke to perform the initial combustion stroke in the gas boiler, the ignition is carried out using the gas supply amount and the exhaust fan rotation speed by the initial set value If it fails, it is possible to improve the probability of ignition success by controlling two factors, gas quantity and fan rotation speed at the same time.

The method of the present invention as described above is as follows: when the boiler operation command is input to the microcomputer 26 to control the gas valve 4 to the initial gas supply state to supply the gas to the burner 28 and the igniter 22 Outputting a high voltage to the first step of operating the exhaust fan 14 to an initial setting state to perform ignition stroke; A second step of judging by the microcomputer 26 using a signal input from the salt voltage detection unit 12 whether ignition at the burner 28 has been achieved; A third step of performing proportional control according to a set temperature while performing combustion stroke when ignition is normally achieved; If the ignition has not been achieved, the operation voltage v of the exhaust fan 14 is decreased by one step to reduce the air volume, and the operation current s of the gas valve 4 is increased by one step to increase the amount of gas. Step 4; And a fifth step of performing the ignition stroke in the microcomputer 26 in accordance with the operation data of the exhaust fan 14 and the gas valve 4 set in the fourth step.

Referring to the accompanying FIG. 4, the method of the present invention starts when a boiler operation command is input from the microcomputer 26. If the heating mode for heating the room or the hot water mode for using hot water is set by the user, the operation command of the boiler is input to the microcomputer 26. Normally, the command is started by operating a switch installed in the room cone 24.

In the microcomputer 26, when the boiler operation command is input, the exhaust fan 14 is operated to supply gas to the burner 28 and discharge the air required for combustion and the waste gas generated after combustion. After that, a high voltage is applied to the igniter 22 to generate a spark to perform ignition stroke.

The control value of the gas valve 4 initially set and the rotation speed of the exhaust fan 14 are set as follows. 3 is a table showing a current value s1 of the gas valve 4 and a voltage value v1 of the exhaust fan 14 used in a conventional proportional control boiler.

The current value s1 of the gas valve 4 is divided into a plurality of values (steps), and a predetermined current value is assigned to each step, and the microcomputer 26 applies this current value to the gas valve 4 to burn. Adjust the gas consumption required.

The gas valve 4 current value is determined at the time of design and stored in the memory element of the microcomputer 26 or the like. The current value of the gas valve 4 is set at a maximum value and a minimum value of approximately 70 to 140 steps, and a corresponding fan voltage v1 value is associated with each step.

Therefore, when the ignition stroke is performed, if it is set to this, the gas consumption amount set for ignition is supplied, and at the same time, the corresponding exhaust fan 14 voltage value is automatically determined so that the ignition stroke is performed. The gas valve 4 value was increased by one step or the exhaust fan 14 rotation speed was decreased by one step. The gas consumption suitable for ignition is set not to the minimum but to a medium value (for example, about step S5).

Ignition achievement in the burner 28 is sensed by using a signal input through the salt voltage detector 12 in the microcomputer 26. At this time, if it is determined that the ignition is completed by the signal from the salt voltage detection unit 12, the microcomputer 26 performs a combustion stroke while controlling the gas valve 4 in accordance with the heating temperature or hot water temperature set by the user. Activate

However, if the signal from the salt voltage detection unit 12 is determined to be ignition failure, the microcomputer 26 performs a purge stroke to completely discharge the waste gas remaining in the burner 28 of the boiler. The purge stroke is a stroke for discharging waste gas into the burner 28 and the boiler by operating the exhaust fan 14 for a predetermined time while the gas valve 4 is turned off. It is called an administration.

When the post purge stroke is completed, the microcomputer 26 resets the gas valve 4 current value s and the voltage value v of the exhaust fan 14 by the method of the present invention. Referring to FIG. 3 again, if the initial setting value of the conventional ignition stroke is the gas valve 4 of S5 and the exhaust fan 14 voltage value v is V5, according to the present invention, the exhaust fan of FIG. The fan voltage value 14 becomes V4 decreased by one step, and the current value of the gas valve 4 becomes S6 increased by one step. In the reset state, the amount of gas supplied from the gas valve 4 is increased and the rotation speed of the exhaust fan 14 is lowered by one step. Therefore, there is a large amount of gas, there is an effect that the ignition becomes easy.

In the state where the current value of the gas valve 4 and the voltage value of the exhaust fan 14 are reset as described above, the microcomputer 26 performs the ignition stroke using the set value (first ignition attempt). The current value of the gas valve 4 is S6, and the exhaust fan 14 voltage value is V4. While the ignition stroke is performed, the microcomputer 26 receives a signal from the salt voltage detection unit 12 again to determine whether ignition has been achieved.

If it is determined that ignition has been achieved, the microcomputer 26 performs a proportional control according to the heating water temperature or the hot water temperature set by the user while performing the combustion stroke. However, if it is not determined that ignition has been achieved, the microcomputer 26 resets the gas valve 4 current value and the exhaust fan 14 voltage value again.

That is, the gas valve 4 current value is increased by one step from S6 to S7, and the exhaust fan 14 voltage value is adjusted by lowering from V4 to V3. Post-purge stroke is performed as above before setting.

In the microcomputer 26, the ignition stroke is performed again using the newly set gas valve 4 current value and the exhaust fan 14 voltage value. However, the ignition stroke is not repeated indefinitely but the amount of gas is supplied so that the ignition stops when the amount of gas increases until the explosion ignition occurs. In this state, the microcomputer 26 completely stops the operation of the boiler and displays an error so that the user may perform necessary actions.

As described above, according to the present invention, there is an advantage of preventing ignition failure occurring during the initial ignition stroke for combustion in the burner of the gas boiler, and stably achieving ignition in the burner.

Although the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that modifications and variations can be made within the spirit and scope of the invention, and such variations or modifications will belong to the appended claims. .

Claims (2)

A microcomputer 26 having a program for controlling the entire stroke, a gas valve 4 for adjusting the gas consumption supplied to the burner 28 according to a control signal from the microcomputer 26, and a burner 28. The gas valve 4 includes an igniter 22 for igniting the supplied gas, a salt voltage detector 12 for detecting ignition achievement, and an exhaust fan 14 for discharging waste gas generated by combustion. ) And a gas boiler that proportionally controls the exhaust fan 14, When the boiler operation command is input to the microcomputer 26, the gas valve 4 is controlled to an initial gas supply state to supply gas to the burner 28, output a high voltage to the igniter 22, and initialize the exhaust fan 14 to an initial setting. Performing a ignition stroke by operating in a state; A second step of judging by the microcomputer 26 using a signal input from the salt voltage detection unit 12 whether ignition at the burner 28 has been achieved; A third step of performing proportional control according to a set temperature while performing combustion stroke when ignition is normally achieved; If the ignition has not been achieved, the operation voltage v of the exhaust fan 14 is decreased by one step to reduce the air volume, and the operation current s of the gas valve 4 is increased by one step to increase the amount of gas. Step 4; And And a fifth step of performing an ignition stroke in the microcomputer (26) according to the operation data of the exhaust fan (14) and the gas valve (4) set in the fourth step. 2. The ignition of the gas boiler according to claim 1, wherein the step of changing the exhaust fan 14 voltage and the current value of the gas valve 4 in the fourth step is increased to the amount of gas before the amount of explosion occurs. Way.