KR19990053096A - Backwind Control Method of Gas Boiler - Google Patents

Abstract

The present invention relates to a control method when a back wind occurs in a gas boiler, and more particularly, a gas boiler which can prevent heating from being stopped or cold water when hot water is used by extinguishing by back wind during operation of the gas boiler. The reverse wind control method of the present invention.

The counter-wind control method of the gas boiler of the present invention is performed in a gas boiler including a microcomputer for controlling the entire stroke, a fan for discharging exhaust gas to the outside and introducing air for combustion, and a wind pressure switch for detecting the counter-wind. The microcomputer detects the operating status of the gas boiler and maintains the standby state if not burning, and detects the operating state of the wind pressure switch if it is burning, and maintains the normal combustion stroke and turns off when the detected wind pressure switch is on. When the microcomputer outputs a control signal to the fan drive unit, the fan's rotational speed is gradually increased, while the fan's rotational speed is gradually increased, the wind pressure switch is maintained until it returns to the on state. If the wind pressure switch does not return, turn off the gas boiler.If the wind pressure switch returns to the on state, And driving for a certain period of time in the on state the fan rotational speed returns to, and returns to be normal rotation after a certain period of time and continues to detect the operating state of the wind pressure switch when the combustion state continues.

Description

Backwind Control Method of Gas Boiler

The present invention relates to a control method in a case where a back wind is generated through the exhaust communication of the gas boiler to hinder combustion in the burner, and in particular, the heating is stopped or hot water is extinguished by the back wind during operation of the gas boiler. It relates to a counter-wind control method of a gas boiler that can prevent cold water from tapping during use.

Gas boiler uses gas that is clean and clean fuel as fuel, and heats the heating water by using the high temperature heat generated after burning fuel in the burner and circulates inside the heating pipe installed in the room to perform the heating in winter. to be.

Since gas is completely burned, gas boilers are increasingly used due to their ease of use as well as a low risk of environmental pollution. First, the operation state of a conventionally used gas boiler will be briefly described with reference to FIGS. 1 and 2.

When the boiler is operated by the user, the gas is supplied through the gas valve 1 in a predetermined amount. At the same time, the microcomputer 31 of FIG. 2 outputs a high voltage to the igniter 5 in order to ignite the gas supplied to the burner 3. The spark generated by the high voltage is ignited with the supplied gas to perform combustion. When the ignition is performed, the salt voltage detection unit 7 measures the salt voltage generated by the spark in the ignition state, and the microcomputer 31 determines whether the ignition has been achieved, and performs the ignition operation when the ignition fails. If is determined to have been achieved, perform normal combustion.

The hot gas generated by the gas combustion rises to the upper side and heats the heat exchanger 9. The heating water contained in the heat exchanger 9 is heated to raise the temperature and then circulated for heating. In the heating mode, the heated heating water is moved through the supply pipe (P1), and then circulates through the heating pipe installed in the room, and is introduced again through the return pipe (P2). The introduced heating water flows into the water tank 15 as the temperature is deprived. The heating water of the water tank 15 flows back into the heat exchanger 9 by the circulation pump 21.

On the other hand, in the hot water mode, the heating water circulates the closed circuit of the heat exchanger (9) -circulating pump (21) -three-way (19) -heat exchanger (9), and the direct water (cold water) flowing in the direction of the arrow (A) is After being indirectly heated by the heating water of the heat exchanger 9, it is hot-pressed in the direction of an arrow B. FIG.

The exhaust gas generated by the combustion in the burner 3 is forcibly discharged by the fan 13 provided on the upper side of the exhaust hood 11. In the related art, however, a reverse air flow is often introduced from the outside through the exhaust hood 11. The reverse wind enters the burner (3) after the exhaust gas is introduced through the exhaust communication discharged to create an incomplete combustion state by blowing the flame, and in severe cases, such as to extinguish in the gas supply state.

Since such a reverse wind cannot be completely blocked, in the related art, a wind pressure switch 27 is installed to detect a reverse wind, and when the wind pressure switch 27 is turned off, the wind is sensed as a reverse wind to turn off the gas boiler to prevent the influence of the back wind. However, the use of the wind pressure switch is a safe method, but the boiler is turned off and the heating is stopped.

The present invention has been made in order to solve the above problems, an object of the present invention is to extinguish by backwind during operation of the gas boiler to prevent the heating is stopped or cold water is not hot water when hot water is used. To provide a control method.

Another object of the present invention is to provide a counter-winding control method of a gas boiler in which the operation of the gas boiler is stably maintained even in the case of the counter-winding, which enables indoor heating and also uses hot water.

The counter-wind control method of the gas boiler of the present invention for achieving the above object, the microcomputer to control the entire stroke, a fan for discharging the exhaust gas to the outside and introduces air for combustion, and a wind pressure switch for detecting the reverse wind In the gas boiler comprising, the microcomputer detects the operating state of the gas boiler and maintains the standby state if not in combustion, and detects the operating state of the wind pressure switch if it is burning, and if the detected state of the wind pressure switch is on, normal combustion If it is off, if it is off, the microcomputer outputs a control signal to the fan drive unit to gradually increase the fan speed, and gradually increases the fan speed until the wind pressure switch returns to the on state. If the wind pressure switch does not return even after rising to the rotational speed, turn off the gas boiler and return the wind pressure switch to the on state. If the drives for a period of time at a number of revolutions of the fan returns to the on-the fan state for a predetermined time, and returns to be normal rotation after a certain period of time and continues to detect the operating state of the wind pressure switch when the combustion state continues.

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

2 is a partial block circuit diagram of the gas boiler of FIG.

3 is a flowchart for explaining the method of the present invention;

4 is a fan speed setting graph used by the method in the present invention.

<Explanation of symbols for main parts of the drawings>

1: gas valve, 3: burner,

5: igniter, 7: salt voltage detection unit,

9: heat exchanger, 11: exhaust hood,

13: fan, 15: water tank,

17: temperature sensor, 19: triangulation,

21: circulation pump, 23: make-up valve,

25: control unit, 27: wind pressure switch,

31: Micom.

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

The method of the present invention is to prevent the operation of the gas boiler due to the reverse wind generated during the operation of the gas boiler to enable heating and use of hot water, detecting the operating state of the wind pressure switch and accordingly the number of rotation of the fan By resetting and driving the fan.

When the gas boiler operation command is input by the user, the microcomputer 31 controls each electric component as previously programmed according to the input control signal. When ignition in the burner 3 is achieved and the combustion stroke is normally performed as described in the operation of the gas boiler, the microcomputer 31 detects the reverse air inflow state using the wind pressure switch 27, and also the fan 13 The number of revolutions is also measured continuously.

If the reverse wind flows in, the signal input state is changed from the wind pressure switch 27 to on-> off. In the microcomputer 31, when the off signal is input, the microcomputer 31 determines that the inflow of air is performed and performs the method of the present invention. For example, the wind pressure switch 27 may use a venturi pipe to detect a pressure difference at the time of the reverse wind inflow and operate on / off.

In the microcomputer 31, when the wind pressure switch 27 is turned off, the rotation speed of the fan 13 is gradually increased instead of extinguishing the gas boiler as in the related art. In other words, to increase the air flow rate of the fan to exhaust the exhaust gas at a pressure greater than the backwind. As the air volume of the fan increases, the probability that the wind pressure switch 27 is turned on gradually increases.

The rotation speed setting state of the fan 13 at this time will be described with reference to FIG. As shown, in the normal combustion state, the rotation speed of the fan 13 is present between the lower limit value A and the upper limit value B depending on the gas consumption amount. The upper limit value B is not the maximum rotation speed of the fan 13 but a lower rotation speed.

Therefore, if a reverse wind flows in the middle of the fan 13 operating between the lower limit value A and the upper limit value B, the microcomputer 31 outputs a control signal to the fan driver 13a to allow the engine to increase the rotation speed. will be. The fan 13 rotation speed can be determined at design time.

When the rotation speed is increased as described above, the wind pressure switch 27 is turned on when more air volume is supplied than the reverse wind. However, if the wind pressure switch 27 is not turned on even at the maximum rotational speed, since the reverse wind is too strong, the microcomputer 31 outputs the gas boiler off indication and performs fire extinguishing.

When the wind pressure switch 27 is turned on by the increase in the rotation speed of the fan 13, the microcomputer 31 maintains the operating state for a predetermined time while maintaining the rotation speed. Therefore, the gas boiler is heated, and hot water supply is also possible.

Maintaining the speed for a certain time is to wait for the backwind to be resolved. That is, the current rotational speed is a normal rotational speed to overcome the occurrence of the reverse wind, and thus maintains an abnormal state for a time when the inflow of the reverse wind can be solved.

As described above, after a predetermined time elapses, the microcomputer 31 outputs a control signal to the fan driver 13a to return to the normal rotation speed again. In the state of returning to the normal speed, the microcomputer 31 continuously detects the on / off operation state of the wind pressure switch 27.

According to the result of detecting the on / off operation state of the wind pressure switch 27 again, if it is detected that there is no reverse wind inflow, the microcomputer 31 continuously performs the combustion stroke. However, when the wind pressure switch 27 is turned off while the combustion stroke is performed again, the microcomputer 31 gradually raises the fan 13 as described above and repeats the operation as described above.

In this way, even if a backwind is generated, the gas boiler is not stopped as in the prior art, but is continuously operated by the method of the present invention. Therefore, the heating can be carried out continuously, even when using hot water is possible to continue to use hot water.

As described above, according to the present invention, there is an advantage in that the gas is extinguished by the reverse wind during the operation of the gas boiler, thereby preventing the heating from being stopped or the cold water from being used when the hot water is used.

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)

The microcomputer 31 for controlling the whole stroke, the gas valve 1 for variably supplying a predetermined amount of gas to the burner 3, and the air required for combustion in the burner 3, and exhausted at the same time In the gas boiler comprising a fan 13 whose rotation speed is adjusted by the fan driving unit 13a by discharging the gas to the outside, and a wind pressure switch 27 which is turned off when the reverse wind is introduced. A first step of detecting an operating state of the gas boiler by the microcomputer 31 and maintaining an atmospheric state when not in combustion, and detecting an operating state of the wind pressure switch 27 when burning; When the detected operating state of the wind pressure switch 27 is on, the normal combustion stroke is maintained, and when off, the microcomputer 31 outputs a control signal to the fan driver 13a to gradually increase the rotation speed of the fan 13. Step 2; A third step of gradually increasing the rotation speed of the fan 13 and maintaining the increase until the wind pressure switch 27 returns to the on state; A fourth step of, when the wind pressure switch 27 returns to the on state, driving the fan 13 for a predetermined time at a fan speed returned to the on state for a predetermined time; And After the predetermined time has elapsed, if the combustion state continues and the combustion state continues, the fifth step of returning to the first step of continuously detecting the operating state of the wind pressure switch 27 is characterized in that the gas boiler Control method. The gas boiler according to claim 1, wherein the rotation speed of the fan 13 is increased to the maximum rotation speed in the third step, and the gas boiler is turned off if the wind pressure switch 27 does not return even at the maximum rotation speed. Reverse wind control method.