KR20000032687A - Method for controlling gas supply amount of gas boiler - Google Patents

Abstract

The present invention is to detect the salt voltage to adjust the amount of gas supplied in accordance with the difference between the sensed voltage and the reference salt voltage to prevent the stop of the boiler caused by the salt voltage out of the range of the reference salt voltage To a gas supply control method of a gas boiler,

The present invention is a gas boiler having a flame detection sensor for detecting the flame when burning the gas in the burner and a gas supply valve for controlling the supply amount of gas, the intensity of the flame in the burner is stored as a voltage value When the salt voltage is within the reference salt voltage range by comparing the detected salt voltage with a preset reference voltage, the normal combustion step of supplying gas continuously with the same supply amount and performing normal combustion is performed. If the salt voltage is above the salt voltage range, increase the gas supply step by step to adjust the salt voltage to be within the reference salt voltage.If the detected salt voltage is below the reference salt voltage range, reduce the gas supply amount to the minimum and then gradually increase the salt voltage to the reference salt voltage. Stable control in response to salt voltage change caused by backwind or suckback phenomenon by adjusting to be within voltage The features that help to make.

Description

Gas supply control method of gas boiler

The present invention relates to a method of controlling the gas supply amount of a gas boiler, and in particular, the salt voltage is lowered by increasing the amount of air due to the backwind through the exhaust flue or the amount of air is reduced as the air is sucked through the exhaust flue. By adjusting the amount of gas supplied to the burner according to the change of the salt voltage such as rising, the salt voltage can be maintained within the range of the reference salt voltage, and thus combustion can be performed at the optimum state. The present invention relates to a gas supply control method of a gas boiler.

In general, a gas boiler includes a combustion unit for burning gas, a gas supply unit for supplying gas, a heat exchange unit for transferring heat of heated hot water to a hot water pipe side, a means for forcibly feeding water, and an operation of the respective components. Consists of a control unit and an adjusting unit for controlling to be made smoothly.

An example of the boiler configured as described above is schematically illustrated in FIG. 1.

Such a boiler ignites and burns the gas introduced into the burner 7 through the gas pipe with an ignition plug or the like to heat the water in the heat exchanger 6 installed in the upper part of the burner 7 to hot water or heating water depending on the purpose. Will be used. In order to burn the gas to heat the water, a gas control valve 2 for controlling the gas supply and supply of air for combustion of the gas and discharge of the burned gas are required. Is provided, and also provided with a flame detection sensor (1) for detecting the state of the flame during the combustion of the gas.

The flame sensor 1 detects the wavelength emitted by the flame when the boiler is ignited, and when the wavelength is 9,000 Å to 1,200 청, it detects the normal combustion state as blue flame, and when the wavelength is about 7,500 Å to 8,000 Å Sulfur salts are perceived as abnormal combustion.

When the voltage value according to the normal flame state is between 2.5V and 4V and it is out of the voltage value range, it is determined to be abnormal. That is, when the reverse wind phenomenon that the air flows backward through the exhaust flue or the amount of air supplied to the burner due to the flue is blocked is less than the gas supply amount (gas consumption to be extinguished), the flame detection sensor 1 is sulfur salt due to incomplete combustion. This causes the salt voltage to fall below the reference salt voltage and the microcomputer stops combustion. On the contrary, if a suck phenomenon occurs in which the vacancy is sucked through the exhaust flue, a large amount of air is introduced into the burner, and the air inflow is greater than the gas supply amount, and the flame detection is detected by the flame detection sensor (1). If the voltage is over the range, the microcomputer sends a stop signal to the burner driver and the burner stops operating.

Such a change in the salt voltage is determined by the color of the flame according to the difference between the amount of gas supplied and the amount of air required for combustion of the gas. In other words, if the amount of air is too large, it becomes sulfur salt, and if appropriate, it becomes blue salt.

The gas boiler, which is controlled to stop the burner when the detected salt voltage is not within the range of the reference salt voltage, not only stops the boiler even by a small backwind or a suck phenomenon, but also causes the boiler to be sucked. Not enough gas is supplied for the operation of the gas, and sufficient heating or hot water cannot be provided. When a backwind occurs, the amount of air is less than that of the gas, resulting in unburned gas and harmful carbon monoxide. There was a problem of shortening the life of the boiler by contamination and corrosion.

An object of the present invention is to compare the salt voltage which is changed according to the back-winding flow back to the exhaust flue or the exhaust phenomena through which the air is sucked through the exhaust flue during operation of the gas boiler compared with the predetermined reference salt voltage range of gas supply amount By reducing the flow rate and the amount of air required to burn the gas to the optimum state by adjusting the salt voltage to be within the standard salt voltage range to enable the boiler to operate in response to a small backwind or suck phenomenon.

In order to achieve the above object, the present invention is a gas boiler having a flame detection sensor for detecting the flame when burning the gas in the burner and a gas supply valve for controlling the supply amount of the gas, the intensity of the flame in the burner A salt voltage detection step of detecting and storing the voltage as a voltage value, a voltage comparison step of comparing the salt voltage detected in the step with a preset reference voltage, and the same supplying amount when the salt voltage detected in the step is within the reference salt voltage range Normal combustion step of continuously supplying gas to perform normal combustion, and if the detected salt voltage is above the reference salt voltage range, the gas supply amount is increased step by step to adjust the salt voltage to be within the reference salt voltage range. If the salt voltage detected in the rising control step and the step is less than the reference salt voltage range, the gas supply amount is It is characterized in that it consists of a gas amount reduction control step of adjusting to reduce the salt voltage to step by increasing the salt voltage is within the reference salt voltage range.

1 is a schematic configuration diagram of a gas boiler,

2 is a schematic control block diagram of a gas boiler controlled by the gas supply amount control method of the gas boiler according to the present invention;

3 is a flowchart illustrating a method of controlling a gas supply amount of a gas boiler according to the present invention.

* Description of the symbols for the main parts of the drawings *

1 .. Flame detection sensor 2 .. Gas supply valve

3 .. exhaust fan 4 .. air intake

5 .. Exhaust gas outlet 6 .. Heat exchanger

7 .. Burner

A. Operation signal input part B. Micom

C. Burner drive part D. Salt voltage detection part

E. Gas valve driving part

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic control block diagram of a gas boiler controlled by a method of controlling a gas supply amount of a gas boiler according to the present invention, and sets a series of operation signals such as heating, heating / hot water, hot water, temperature, and time for a boiler operation And a microcomputer (b) for controlling and outputting a signal controlled by a predetermined program with respect to the driving signal inputted by the driving signal input unit (a), and the microcomputer (b). Burner drive unit (C) to be ignited and driven by the control signal of the < RTI ID = 0.0 >), < / RTI > a salt voltage detector (D) to detect the salt voltage of the flame burned in the burner by the control signal of the microcomputer (B), and the microcomputer ( B) a gas valve driving portion (e) for controlling the opening and closing amount of the gas valve according to the gas valve control signal of b).

The gas valve control signal for controlling the gas valve driving unit (e) is generated by comparing the salt voltage detected by the salt voltage detecting unit (d) with a reference salt voltage range preset in the microcomputer (b). If the detected voltage is above the reference salt voltage range, the gas valve is driven to open stepwise, and if the sensed voltage is below the reference salt voltage range, the gas valve is driven to close it stepwise.

3 is a flowchart illustrating a method of controlling a gas supply amount of a gas boiler according to the present invention, in which a gas is supplied when a boiler is started in an initialization state before a boiler is operated, and a spark plug emits a spark so that the supplied gas starts combustion. Combustion step 31 for performing bark combustion after ignition by the ignition step 30, and salt voltage detection step for detecting the intensity of flame burning in the burner and storing the detected salt pressure value in the microcomputer (b). (32), a salt voltage comparison step 33 for comparing the salt voltage sensed in the salt voltage detection step 32 and stored in the microcomputer (b) with a preset reference voltage range, and the salt voltage comparison step 33 If the detected salt voltage is within the standard salt voltage range, normal combustion is performed so that the burner performs normal combustion by continuously supplying gas with the same supply amount without re-adjusting the gas supply valve. When the salt voltage detected in the system 34 and the salt voltage comparison step 33 is equal to or greater than the reference salt voltage range, the gas supply amount is increased by one step to increase the gas supply amount so that the salt voltage is within the reference salt voltage range. If the salt voltage detected in the rising control step 35 and the salt voltage comparison step 33 is less than the reference salt voltage range, the gas supply amount is reduced to a minimum and then raised in steps to adjust the salt voltage to be within the reference salt voltage range. It is to be made to perform the gas amount reduction control step 36.

After the gas amount increase control step 35 and the gas amount decrease control step 36 are carried out, the salt voltage is again sensed and compared with the reference salt voltage range to repeat the above steps until the salt voltage is within the reference salt voltage range. do.

According to the present invention made as described above, when the power is applied to the boiler, the microcomputer (b) of the boiler controls the voltage supplied to the exhaust fan to discharge the gas remaining in the burner, and then controls the gas valve driving unit (e). Open to supply gas into the burner.

When the gas is supplied to the burner as described above, a spark is generated by applying a voltage to the spark plug, and the spark generated from the spark plug proceeds to the ignition stage 30 to be ignited with the gas supplied into the burner. The gas complexed in 30 proceeds to the combustion step 31 which is continuously burned. Simultaneously with the entry into the combustion stage 31 where the continuous combustion of the gas proceeds as described above, the microcomputer (b) sends a salt voltage detection command to the salt voltage detection unit (d) and the salt voltage detection unit (d) is flame detection. Different salt voltages are detected according to the intensity of the flame detected by the sensor, and the detected salt voltage is transferred to the microcomputer (na), and the microcomputer (na) stores them.

As described above, the salt voltage sensed in the salt voltage detection step 32 and stored in the microcomputer (b) proceeds to the salt field comparison step 33 comparing the salt voltage range preset in the microcomputer (b).

In the salt voltage comparison step 33, the signal is input to the microcomputer by dividing the detected salt voltage into a reference salt voltage range, when the salt pressure is above the reference salt voltage range, and when the salt voltage is below the reference salt voltage. The microcomputer (b) transmits and controls the gas valve driving unit (e) according to the signal transmitted from the fraud salt voltage comparison step 33.

When the salt voltage compared from the salt voltage comparison step 33 is within the reference salt voltage range, the microcomputer (b) controls the gas valve driving unit (e) so that the gas supply amount is normal. The gas valve driving part (e) does not drive the gas valve, and if the detected salt voltage is above the standard salt voltage range, the microcomputer (b) has a small amount of gas supply, so the gas valve is opened one more step. The control signal for increasing the supply amount is sent to the gas valve driver (e), and the gas valve driver (e) is a gas supply amount increase control step 35 for driving the gas valve so that the gas valve is opened by one more step. Will proceed.

On the contrary, if the detected salt voltage is below the reference salt voltage range, the microcomputer (b) sends a control signal to the gas valve driving unit (e) to reduce the gas valve to a minimum state because the gas supply amount is too high. Then, the gas valve driving unit (e) proceeds to the gas amount reduction control step 36 for driving the gas valve so that the gas valve is almost closed, that is, the amount of supply gas is at a minimum.

The reason why the gas amount reduction control step 36 is carried out as described above is that when the annual voltage is below the reference salt voltage range, the amount of gas supplied is so large that the amount of air supplied is so small that the amount of oxygen required to burn the gas is small. Soot is generated in the burner due to incomplete combustion of the furnace, and if soot is deposited on the outer wall of the heat exchanger, it not only causes the efficiency of the heat exchanger, but also shortens the life of the heat exchanger. This is to allow the gas and harmful carbon monoxide to be sufficiently discharged or burned.

When the gas amount rises or decreases in the gas amount increase control step 35 or the gas amount decrease control step 36, the salt voltage of the flame combusted by the readjusted gas supply amount is detected again, and the detected salt voltage is again compared with the salt voltage. Step 33 is compared with the reference salt voltage range and repeats the normal combustion step 34, the gas amount increase control step 35 or the gas amount decrease control step 36.

The reference salt voltage range is set by detecting and storing the upper and lower limits of the detected salt voltage in the microcomputer when the boiler is normally operated in an optimal gas supply state, and is stored in the microcomputer (B) when the boiler is stopped. It is a standard for comparison with the detected salt voltage.

As described above, the present invention provides an imbalance between the amount of air in the burner and the amount of gas in the burner due to a back wind in which air is introduced into the burner through the exhaust flue during the initial operation or during the operation of the gas boiler, or a suck phenomenon in which air is forcibly discharged through the exhaust flue. If the detected salt voltage is not within the standard salt voltage range, the salt supply voltage is adjusted by adjusting the opening of the gas supply valve to adjust the amount of gas supplied to the burner to balance the amount of gas and air. By allowing the voltage to be in the range, there is an effect to prevent the salt voltage from rising or falling out of the reference salt voltage range due to a small backward wind or a suck phenomenon.

In addition, by preventing excessive gas supply, soot or harmful carbon monoxide may be prevented from being generated by the unburned gas when the excessive gas is supplied, thereby preventing contamination or damage of the outside of the heat exchanger due to contamination. When the gas supply is insufficient, the burner's thermal power is weakened, and thus, the heat exchanger is not heated enough to prevent heating or insufficient temperature of the hot water.

Claims (2)

In the gas boiler having a flame detection sensor for detecting the flame when burning the gas supplied into the burner and a gas supply valve for controlling the amount of gas supplied into the burner, A combustion step 31 of supplying gas in an initialization state before boiler operation and combusting the supplied gas to start combustion; Salt voltage detection step 32 for detecting the intensity of the flame in the burner, A salt voltage comparison step 33 of comparing the salt voltage sensed in the step 32 with a preset reference salt voltage range; When the salt voltage sensed in the step 33 is within the reference salt voltage range, the normal combustion step 34 to continuously supply the gas in the same supply amount to perform the normal combustion of the burner, If the salt voltage sensed in the step 33 is greater than the reference salt voltage range, the gas amount increase control step 35 of adjusting the salt voltage to be within the reference salt voltage range by increasing the gas supply step by step; When the salt voltage sensed in the step 33 is less than the reference salt voltage range, the gas supply amount is reduced to the minimum, and then the gas amount decreases and adjusts step 36 so as to adjust the detected salt voltage to be within the reference salt voltage range. Gas supply amount control method of a gas boiler, characterized in that consisting of. According to claim 1, wherein the reference salt voltage range is set to be stored in the microcomputer to detect the upper and lower limits of the salt voltage detected when the boiler is operating normally in the optimum gas supply state is stored when the boiler is stopped and restarted A method of controlling the gas supply amount of a gas boiler, characterized in that the comparison with the salt voltage.