KR0157168B1 - Ignition method of gas boiler - Google Patents

Abstract

The present invention relates to a method of ignition of a gas boiler, and more particularly, to a method of discharging high pressure in order to ignite a gas which is a fuel supplied to a burner of a gas boiler.

The ignition method of the gas boiler of the present invention is: pre-purge stroke is performed at the highest RPM by operating the exhaust fan, and ignition of the gas boiler which ignites the gas supplied through the high pressure discharge while reducing the RPM of the exhaust fan to the ignition RPM. In the method, after the pre-purge stroke is performed, the high-pressure discharge is delayed for a predetermined time, and when the rotation speed of the exhaust fan is driven at the ignition RPM, the high-pressure discharge is performed to ignite.

Description

Ignition Method of Gas Boiler

1 is a graph showing the relationship between the fan RPM and the high-pressure discharge time according to the conventional ignition method.

2 is a graph showing a relationship between gas pressure and time according to a conventional ignition method.

3 is a schematic partial block diagram of a gas boiler conventionally used.

4 is a graph showing the relationship between the fan RPM and the high-pressure discharge time according to the method of the present invention.

5 is a graph showing the relationship between gas pressure and time according to the method of the present invention.

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

* Explanation of symbols for main parts of the drawings

1: micom 3: timer

5: flame igniter 7: gas valve

9: flame detector 11: exhaust fan

The present invention relates to a ignition method of a gas boiler, and more particularly, to a method of discharging a high pressure in order to ignite a gas which is a fuel supplied to a burner of a gas boiler. In particular, the present invention relates to an ignition method for delaying discharge time in order to prevent ignition failure.

When the gas boiler installed in the home is operated in winter or as needed, the main boiler part of the gas boiler outputs a control signal to perform a pre-purge stroke to discharge the exhaust gas remaining in the gas boiler to the outside. . The pre-purge stroke is a stroke for operating the exhaust fan installed in the exhaust year of the gas boiler for a predetermined time. This pre-purge stroke is performed at the highest pre-purge speed (RPM) for about 8-10 seconds.

After the pre-purge stroke is completed, the rotation speed of the fan is rapidly reduced to an ignition speed suitable for ignition of gas, and the ignition stroke is performed to discharge the high voltage from the spark igniter to ignite the fuel supplied to the burner. do.

However, in the conventional method as described above, the problem that the ignition stroke in the burner is not performed well. First, the ignition stroke in a conventional gas boiler will be described with reference to FIGS. 1 and 2.

When the gas boiler is operated, a pre-purge stroke is performed to drive the exhaust fan at the highest speed. At this time, the required time T1 is about 8 to 10 seconds, and when this time is over, the high-pressure discharge is started from the spark igniter at the position a point in Fig. 1 from the spark igniter.

However, conventionally, the rotation speed of the exhaust fan is characterized in that the rotation speed is proportionally reduced as shown, without immediately descending to the ignition RPM even after the pre-purge stroke is completed. This is caused by the inertia force of the exhaust fan rotating at high speed. Conventionally, this time T2 takes about 1 second.

At the start of the high pressure discharge, after some time has passed, the gas valve opens and gas is supplied to the burner. However, as described above, since the rotational speed of the exhaust fan immediately reaches the ignition RPM and decreases constantly, the ignition of the gas to be supplied fails due to this effect.

This is because, as shown in FIG. 2, the gas is supplied after the pre-purge stroke is terminated, so that it is not ignited at the ignition pressure at the initial gas supply, which is the ideal ignition point, but at the time after the gas is supplied. The problem of ignition or ignition failed.

The present invention has been drawn to solve the above problems, an object of the present invention to provide an ignition method of the gas boiler for the prevention of explosion ignition and safe ignition during the ignition of the gas boiler.

Another object of the present invention is to provide a gas boiler which can be operated more safely in the home use as described above.

The ignition method of the gas boiler of the present invention for achieving the above object is: Pre-purge stroke is performed at the highest RPM by operating the exhaust fan, gas supplied by performing high pressure discharge while reducing the RPM of the exhaust fan to the ignition RPM In the ignition method of a gas boiler which ignites the gas, the high-pressure discharge is delayed for a predetermined time after the pre-purge stroke is performed, and if the rotation speed of the exhaust fan is operated by the ignition RPM, the high-pressure discharge is applied to ignite the gas in the burner. Characterized in that.

Hereinafter, the ignition method of the gas boiler of the present invention will be described in detail with reference to FIGS. 3 to 6 as follows.

According to the method of the present invention, the rotation speed of the exhaust fan is maintained at the ignition speed, and the ignition is carried out by a high-pressure discharge by giving a delay time of the ignition stroke.

The method of the present invention; Pre-purge stroke is performed at the highest RPM by operating the exhaust fan 11, and the gas that ignites the gas supplied by generating a high pressure discharge from the flame detector 9 while reducing the RPM of the exhaust fan 11 to the ignition RPM A ignition method of a boiler, comprising: a first step of delaying a high pressure discharge for a delay time (T3) after a pre-purge stroke is completed; A second step of performing a high pressure discharge for a predetermined time after the delay time T3 has elapsed; A third step of supplying gas to the burner by opening the gas valve 7 after a predetermined time T4 has elapsed after the high-pressure discharge is started; And a fourth step of detecting that the gas is ignited in the burner.

First, the high-pressure discharge time and the ignition time by the method of the present invention will be described with reference to FIG. When the pre-purge stroke is completed after a predetermined time T1, the delay time T3 is set for a predetermined time without causing the high voltage discharge as shown in FIG. The delay time T3 is for the RPM of the exhaust fan to completely reach what is set as the ignition RPM. When the delay time T3 is set in this way and the ignition RPM of the exhaust fan is reached, high-pressure discharge is performed thereafter.

Therefore, the high voltage discharge is performed at point b after the delay time T3 has elapsed, rather than point a. The delay time (T3) is preferably a time that the RPM of the exhaust fan can reach the ignition RPM, it is preferably carried out for about 1 to 3 seconds.

The high pressure discharge is performed for about 8 to 10 seconds using a spark igniter, similar to the conventional method.

The high pressure discharge is performed at point b in FIG. 4, and gas is supplied from the gas valve after a predetermined time T4 has elapsed. The gas pressure supplied from the gas valve is initially supplied at the minimum pressure. Since the RPM of the exhaust fan maintains an appropriate RPM state for ignition according to the present invention, the gas is supplied and ignited immediately.

The predetermined time T4 is generally preferably about 0.5 seconds, and the reason for the time difference between the high-pressure discharge and the gas supply is to prevent the gas from being first supplied and the explosion ignition.

The relationship between the high pressure discharge time and the gas pressure will be described with reference to FIG.

After the initial pre-purge stroke ends at point a, the high-pressure discharge is delayed by the set delay time T3. At this time, no gas is supplied. A, b, c in FIG. 4 and a, b, c in FIG. 5 represent the same viewpoint.

The high voltage discharge is started at point b at which the delay time T3 is completed. The RPM of the exhaust fan at this time is maintained at an RPM suitable for ignition as in FIG. In this state, the gas valve is controlled at point c after the predetermined time T4 has elapsed to supply gas to the burner. The gas pressure supplied at point c becomes the minimum gas pressure, and since the RPM of the exhaust fan is maintained at a stable RPM, the ignition is possible as soon as it is supplied.

At this time, it is also possible to adjust the gas supply amount to the minimum supply amount for a predetermined time in order to supply the gas after ignition is completed without gradually increasing the gas supply amount. That is, after ignition is confirmed, the proportional control valve is adjusted to supply the gas necessary to raise the temperature of the heating water to the temperature set by the user.

The ignition of the burner can be detected using a flame detector. If a flame is not detected, the above stroke is re-executed to perform ignition again.

The method of the present invention as described above will be described using the partial block diagram of FIG. 3 and the flowchart of FIG.

When the user operates the boiler, the microcomputer 1 operates the exhaust fan 11 for a predetermined time T1 for the pre-purge stroke. When the pre-purge stroke has elapsed time and is completed at point a, the microcomputer 1 measures the lapse of time with a rudder (3), and when a predetermined delay time T3 elapses, the high pressure from the flame igniter 5 Perform a discharge. This is point b.

At the point b, referring to FIG. 4, the RPM of the exhaust fan 11 has reached the ignition RPM. In this state, after the high pressure discharge is started, the gas valve 7 is opened with a slight time delay. This delay of the predetermined time T4 is because when the gas is supplied before or at the same time as the high pressure discharge, the gas may explode and ignite. The predetermined time T4 is preferably about 0.5 seconds.

The gas valve 7 is opened in accordance with a control signal output from the control microcomputer 1. The control signal is generally a current, and the opening degree of the gas valve 7 is changed according to the magnitude of the applied current.

After the gas valve 7 is opened, the microcomputer 1 performs the ignition detection stroke to confirm whether the flame is ignited at the burner.

The ignition detection stroke is compared and judged by the microcomputer 1 based on the voltage data input from the flame detector 9 located adjacent to the burner. For example, when the voltage input from the flame detector 9 is 5V, it is determined that the ignition is not performed and the fire extinguishing stroke is performed. If the input voltage is less than 4.4V, it is determined that it is ignited in the burner and the following steps are performed. Those skilled in the art to which the present invention pertains will readily know that the voltage value is an example for explanation and may be changed according to the type of boiler.

As described above, the present invention provides a gas boiler that can be operated more safely in home use by providing a method of ignition of a gas boiler for preventing explosion and safe ignition when the gas boiler is ignited.

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)

Pre-purge stroke is performed at the highest RPM by operating the exhaust fan 11, and the gas that ignites the gas supplied by generating a high pressure discharge from the flame detector 9 while reducing the RPM of the exhaust fan 11 to the ignition RPM A ignition method of a boiler, comprising: a first step of delaying a high pressure discharge for a delay time (T3) after the pre-purge stroke is completed; A second step of performing a high pressure discharge for a predetermined time after the delay time T3 has elapsed; A third step of supplying gas to the burner by starting the high-pressure discharge and opening the gas valve 7 after a predetermined time T4 elapses; And a fourth step of detecting that the burner is ignited with the gas. The gas boiler ignition method according to claim 1, wherein the delay time T3 in the first step is about 1 to 3 seconds. 2. The gas boiler ignition method according to claim 1, wherein the RPM of the exhaust fan (11) reaches an ignition PRM state in the second step.