KR0169056B1 - Hot water temperature keeping method for gas-boiler in case of adverse wind - Google Patents

Abstract

The present invention relates to a method of maintaining a hot water of a gas boiler, and more particularly, a gas boiler in the case of a back wind in which a user can use hot water continuously by maintaining a hot water temperature by controlling the combustion completely without stopping the operation of the boiler even when a back wind occurs. It relates to a method of maintaining hot water temperature.

The method of the present invention includes a first step of detecting whether a constant gas pressure is supplied when the boiler is operated in a hot water mode; A second step of measuring whether the temperature is lowered by more than 5 ° C. by measuring the temperature change of the heating supply water if the gas pressure is constant; A third step of measuring whether a predetermined time has elapsed by operating a timer when the temperature of the heating supply water drops by 5 ° C. or more; A fourth step of determining that inverse wind is introduced when a predetermined time elapses in a state where the temperature decreases and increasing the rotation speed of the exhaust fan; Re-measuring the temperature of the heating supply water to determine whether the temperature has risen to a temperature before the reverse wind detection; And a sixth step of returning the rotational speed of the exhaust fan to the rotational speed before the reverse wind detection when the temperature rises to the temperature before the reverse wind detection.

Description

How to maintain hot water temperature of gas boiler in case of backwind

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

2 is a schematic block diagram of a circuit used in the present invention.

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

* Explanation of symbols for main parts of the drawings

1 gas valve 3 control unit

5: burner 7: spark plug

9: flame detection rod 11: heat exchanger

13 exhaust year 15 exhaust fan

17: exhaust fan drive unit 19: rotation speed detection unit

21: heating temperature sensor 23: timer

31: micom

The present invention relates to a method of maintaining a hot water of a gas boiler, and more particularly, to maintain a hot water temperature by controlling the combustion completely without stopping the operation of the boiler even in the event of a reverse wind gas boiler when the user can use hot water continuously. It relates to a method of maintaining hot water temperature.

In a conventionally used gas boiler, backwind is generated in which wind is introduced into the boiler from the outside through the exhaust flue during use. When the reverse wind is introduced, the exhaust force is weakened, and thus the combustibility is greatly deteriorated, and thus incomplete combustion occurs. Therefore, since the heating supply water temperature is lower than the temperature set by the user, it increases the amount of gas to reach the set temperature, but also has a lot of difficulties in reaching the set temperature due to the weakening of the exhaust force by the backwind. In addition, since a lot of carbon generated due to incomplete combustion is fixed to the surface of the burner or the exhaust flue, there was a problem such as shortening the life of the gas boiler.

Furthermore, if the counter-wind continues for a certain period of time (about 30 seconds) after the counter-wind is introduced, not only does it cause a lot of trouble in combustion in the burner, but also harmful gas may be introduced into the room. Will block. Therefore, when the temperature of the hot water is lowered due to the inflow of the reverse wind during the use of hot water, and the supply of hot water is interrupted, the user is inconvenient to use the hot water.

Referring to Figure 1 will be described the schematic structure and operating state of a conventionally used gas boiler. As is well known, a gas boiler is a device that uses heat generated by burning a clean fuel gas in a burner. The gas boiler converts low temperature direct water or heating water into high temperature hot water or heating water using a heat exchanger 11. Later, it supplies hot water or circulates inside the heating pipe installed in the room to heat it.

Conventionally, the exhaust gas combusted in the burner 5 after being supplied through the gas valve 1 installed in the gas boiler is discharged by the exhaust fan 15 installed in the exhaust flue 13 located on the upper side of the burner 5. It is forced out of the boiler. The exhaust fan 15 may control the rotation speed of the exhaust fan by changing the voltage applied to the exhaust fan driver 17 and may also measure the rotation speed of the fan by using a separate measuring device.

When reverse wind flows from the outside through the exhaust flue 13, the heat exchanger 11 and the burner 11 reach the inside of the boiler where the exhaust gas is stopped. Therefore, incomplete combustion occurs because the air required for combustion is not smoothly supplied from the outside, and the carbon in the combustion gas generated at this time is the inner surface of the burner 11, the outer surface of the heat exchanger 13, and the exhaust flue ( 13) It is attached to the inner surface. In addition, since the calorific value rapidly decreases following incomplete combustion, the temperature of the heated heating water drops rapidly, and thus the temperature of the hot water drops, and thus, the cold direct water is supplied without reaching the hot water temperature set by the user. .

The present invention has been made to solve the above problems, an object of the present invention is to provide a boiler control method for preventing a decrease in the heating supply water temperature generated when the counter-wind inflow.

Another object of the present invention is to provide a method for maintaining a hot water temperature of a gas boiler which can prevent the temperature of the hot water is lowered at the time of the reverse wind inflow causing inconvenience in use.

The method of the present invention for achieving the above object, the first step of detecting whether the constant gas pressure is supplied when the boiler is operated in the hot water mode; A second step of measuring whether the temperature is lowered by more than 5 ° C. by measuring the temperature change of the heating supply water if the gas pressure is constant; A third step of measuring whether a predetermined time has elapsed by operating a timer when the temperature of the heating supply water drops by 5 ° C. or more; A fourth step of determining that inverse wind is introduced when a predetermined time elapses in a state where the temperature decreases and increasing the rotation speed of the exhaust fan; Re-measuring the temperature of the heating supply water to determine whether the temperature has risen to a temperature before the reverse wind detection; And a sixth step of returning the rotational speed of the exhaust fan to the rotational speed before the reverse wind detection when the temperature rises to the temperature before the reverse wind detection.

Hereinafter, a method of the present invention will be described with reference to the accompanying drawings.

First, FIG. 2 is a schematic block circuit diagram of a conventional gas boiler, which is used to carry out the method of the present invention. As shown, a gas valve 1 for adjusting the amount of gas in accordance with a control signal output from the microcomputer 31 of the main control part, and an ignition plug 7 for igniting the gas supplied through the gas valve 1 in the burner. And an exhaust fan driver 17 for sensing the ignition state of the burner and inputting the flame detection rod 9 to be input to the microcomputer 31 and the exhaust fan 15 for discharging the exhaust gas through the exhaust flue. And a rotation speed sensing unit 19 for sensing the rotation speed of the exhaust fan, a heating temperature sensor 21 for measuring the temperature of the heating supply water, and a timer 23 for measuring the passage of time; have.

The method of the present invention carried out in the gas boiler of the above structure is as follows: The boiler is operated in hot water mode and the voltage or current value output from the microcomputer 31 to the gas valve 1 whether the constant gas pressure is supplied. A first step of measuring using; A second step of measuring whether the heating water temperature is lowered by 5 ° C. or more by measuring the temperature change of the heating supply water using the heating temperature sensor 21 at the microcomputer 31 when the gas pressure is constant; A third step of measuring whether a predetermined time T has elapsed by operating the timer 23 by outputting a control signal from the microcomputer 31 when the temperature of the heating supply water drops by 5 ° C. or more; When the predetermined time T has elapsed while the temperature has been lowered by 5 ° C. or more, it is determined that the reverse wind is introduced and a control signal is sent from the microcomputer 31 to the exhaust fan driver 17 so as to increase the rotation speed of the exhaust fan 15. Outputting a fourth step; A fifth step of re-measuring the temperature of the heating supply water using the heating temperature sensor 21 to determine whether the temperature has risen to a temperature before the reverse wind detection; And outputting a control signal from the microcomputer 31 to the exhaust fan driver 17 to return the rotation speed of the exhaust fan 15 to the rotation speed before the reverse wind detection when the temperature of the heating supply water rises to the temperature before the reverse wind detection. It consists of six steps.

It should be noted that the method of the present invention is particularly applicable only in hot water mode. In other words, in the hot water mode, even if the user is currently using hot water, even if the inflow of gas caused by the reverse wind does not have a long time because it does not affect the boiler. However, in the heating mode, when the inflow of the backwind occurs, it is used for a long time or at night, so be careful of the gas inflow due to the inflow of the backwind.

When the gas boiler is operated in the hot water mode, as a first step, the microcomputer 31 measures the amount of gas supplied using a control signal output to the gas valve 1, that is, a current value or a voltage value. This can confirm the current value or the voltage value directly from the microcomputer 31. This change in gas pressure is always detected.

In a state in which the gas pressure is constant, the microcomputer 31 measures the temperature change of the heating supply water using the heating temperature sensor 21 attached to the heating supply pipe. At this time, if the heating water temperature is lowered by 5 ° C or more while maintaining the constant gas amount, the microcomputer 31 outputs an operation signal to the timer 23 to operate the timer 23. That is, in the microcomputer 31, when the temperature of the heating supply water drops by a predetermined temperature while a certain amount of gas pressure is supplied, the timer 23 is operated to measure how long the temperature lowering state lasts.

When the temperature change amount is 5 ° C. or less while the timer 23 is operated, the microcomputer 31 detects the state of the gas amount again and measures the temperature change amount. However, if the time for which the temperature change amount remains lower than 5 ° C. exceeds a predetermined time (about 30 seconds), the microcomputer 31 determines that the reverse wind is introduced. In this case, however, the rotation speed of the exhaust fan 15 input from the rotation speed detection unit 19 is ignored. This is because, in general, when the reverse wind flows in, the rotation speed of the exhaust fan 15 increases.

When the inflow of wind is confirmed, the microcomputer 31 outputs a control signal to the exhaust fan driver 17 to increase the rotation speed of the exhaust fan 15. The rotation speed of the exhaust fan 15 can be increased by increasing the output of the control signal, that is, the voltage or current value. At this time, the rotation speed of the exhaust fan 15 should be rotated to a value larger than the rotation speed due to the counterwind. The increase in the voltage or current value can be measured by an experiment. For example, the rotation speed of the exhaust fan is increased in the state in which the inflow of the reverse wind is sensed to determine the rotation speed to be completely burned. Another method is to increase the voltage or current value to a certain size, and detect the change in temperature so that the temperature change value reaches the state of returning to the heating water temperature of the initial state in which a constant amount of gas is not introduced and a certain amount of gas is supplied. Can be set to burn.

As described above, when the temperature of the heating supply water re-measured using the heating temperature sensor 21 rises to the temperature before the reverse wind detection, the microcomputer 31 returns the rotation speed of the exhaust fan 15 to the rotation speed before the reverse wind detection. ) Outputs a control signal to the exhaust fan driver 17.

The effect of the method of the present invention as described above will be described with reference to the flowchart of FIG. In the state where hot water is used by the user, the microcomputer 31 measures the degree of change of the amount of gas currently supplied to the burner 3 using the voltage value or the current value applied to the gas valve 1. When hot water is used, there is almost no change, but when the set temperature is changed by the user, a change occurs in the voltage value or the current value. When such a change occurs, the microcomputer 31 again detects a fluctuating state of the gas amount for a predetermined time, and when the unchanged state is maintained for a predetermined time, the temperature of the heating water is measured using the heating temperature sensor 21.

If the measured change in heating water temperature is found to have fallen below 5 ° C even when there is no change in gas volume, this is due to incomplete combustion caused by the inflow of counter-wind. In the microcomputer 31, the timer 23 is operated again in order to reliably determine the inflow of the reverse wind, and the elapse of time in the state where the temperature falls by 5 DEG C or more is measured. In other words, if the temperature does not continue to rise even during the predetermined time (T), it is recognized that the inflow of the reverse wind continues. The predetermined time T may be set to, for example, about 30 seconds, which is a conventional reverse wind detection time.

Such a step is essentially to detect the inflow of the reverse wind by measuring the change in the heating water supply temperature with respect to the amount of gas. Therefore, when the reverse wind is introduced, the temperature of the heating supply water is lowered as described above, and accordingly, the temperature of the hot water is also lowered proportionally. As a result, a problem occurs that the temperature of the hot water falls while the user uses the hot water.

When the reverse wind is detected as described above, the microcomputer 31 outputs a control signal to the exhaust fan driver 17 to increase the rotation speed of the exhaust fan 15. The reason for increasing the rotation speed of the exhaust fan is to increase the supply of air to completely burn the combustion in the burner. At this time, care should be taken to keep the rotation speed of the exhaust fan 15 at a very high state. That is, since the rotational speed of the exhaust fan 15 naturally increases when the reverse wind is introduced, an appropriate voltage value or current value must be applied to rotate the exhaust fan 15 at a higher rotational speed than the increased rotational speed. For this purpose, by using the rotation speed detection unit 19 to measure the number of revolutions at the time of the reverse wind inflow, a predetermined value is applied so that the exhaust fan 15 can rotate at a higher rotation speed than the measured rotation speed. In general, the use of a DC driving motor in the exhaust fan driving unit 17 makes it possible to easily change the rotation speed according to a popular voltage or current value.

As described above, when the rotation speed of the exhaust fan 15 is increased, a sufficient amount of air is supplied to the burner of the boiler so that the combustion state is improved even in the counter-inflow state. Therefore, the temperature of the heating supply water circulating in the heat exchanger 11 increases, and thus the temperature of the hot water also increases.

The microcomputer 31 continuously measures the temperature of the heating water supply to detect whether the temperature has risen to the temperature before the counterwind detection. When the measured temperature rises to the temperature before the reverse wind detection, a control signal is output to the exhaust fan driver 17 so as to return the rotation speed of the exhaust fan 15 back to the rotation speed before the reverse wind detection. If the temperature has not been restored, the rotation speed of the exhaust fan is further increased to perform the same process again. When the temperature of the heating feed water rises, the temperature of the hot water also rises in proportion to it and then taps.

In addition, for the safety of the boiler, if the temperature of the heating water is not increased even by the increase of the exhaust fan, fire extinguishing stroke of the boiler by the counter-wind is performed. This is essentially the same as a conventional fire fighting administration.

As described above, according to the method of maintaining the hot water temperature of the gas boiler when the reverse wind occurs, it is possible to prevent a decrease in the heating supply water temperature generated when the reverse wind is introduced, and to prevent the hot water temperature from being lowered and causing inconvenience in use. There is an advantage.

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 (3)

A gas valve 1 for adjusting the gas amount in accordance with a control signal output from the microcomputer 31, an exhaust fan driver 17 for driving an exhaust fan 15 for exhausting exhaust gas through the exhaust flue, and an exhaust fan In the gas boiler comprising a rotation speed detection unit 19 for detecting the number of revolutions of the water, a heating temperature sensor 21 for measuring the temperature of the heating supply water, and a timer 23 for measuring the passage of time. A first step of measuring whether the constant gas pressure is supplied when the boiler is operated in the hot water mode using a voltage or current value output from the microcomputer 31 to the gas valve 1; A second step of measuring whether the heating water temperature is lowered by 5 ° C. or more by measuring the temperature change of the heating supply water using the heating temperature sensor 21 at the microcomputer 31 when the gas pressure is constant; A third step of measuring whether a predetermined time T has elapsed by operating the timer 23 by outputting a control signal from the microcomputer 31 when the temperature of the heating supply water drops by 5 ° C. or more; When the predetermined time T has elapsed while the temperature has been lowered by 5 ° C. or more, it is determined that the reverse wind is introduced and a control signal is sent from the microcomputer 31 to the exhaust fan driver 17 so as to increase the rotation speed of the exhaust fan 15. Outputting a fourth step; A fifth step of re-measuring the temperature of the heating supply water using the heating temperature sensor 21 to determine whether the temperature has risen to a temperature before the reverse wind detection; And outputting a control signal from the microcomputer 31 to the exhaust fan driver 17 to return the rotation speed of the exhaust fan 15 to the rotation speed before the reverse wind detection when the temperature of the heating supply water rises to the temperature before the reverse wind detection. The hot water temperature maintenance method of the gas boiler at the time of the backwind, characterized in that consisting of six steps. The method of claim 1, wherein the predetermined time (T) in the third step is 30 seconds. The exhaust fan (15) of claim 1, wherein the rotation speed of the exhaust fan (15) is measured by using the rotation speed sensing unit (19) at the time of the reverse wind inflow in the fourth step. Method of maintaining the hot water temperature of the gas boiler during the reverse wind generation, characterized in that for rotating.