JP2581727Y2 - Operation control device for combustor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustor operation control device, and more particularly to a combustor operation control device having a so-called one-touch type automatic reset switch for ignition / extinguishing, which can perform ignition / extinguishing by a light push operation. It concerns the device.

[0002]

2. Description of the Related Art A one-touch type automatic reset type switch has the convenience of being able to fire and extinguish with a light touch operation, but the push button is usually inserted through a resin case plate.
The automatic reset type switch is mounted on a printed circuit board or the like, and the resin case board and the printed circuit board may be warped and deformed, and there is a danger that the switch will be turned on unexpectedly and continue burning unexpectedly. In addition, the contact is made conductive by the moisture (moisture), and the automatic reset type switch is turned on, so that the gas combustor continues to burn unexpectedly, which is a safety problem.

[0003] Therefore, conventionally, whether or not combustion can be continued is determined based on whether or not the OFF state of the automatic reset type switch contact is detected, thereby taking measures to prevent the unexpected accident. The outline of the combustor will be described below with reference to FIG. When an ignition (fire extinguishing) button provided in the combustor is pressed, an electromagnetic valve provided in the gas flow path is opened to open a fuel gas flow path, and the fuel gas is ignited by a burner. Start. And
The combustion is continued as it is until a certain time (for example, 5 seconds) elapses after the automatic return type ignition (extinguishing) switch (hereinafter simply referred to as an ignition switch) is turned on. After elapse of 5 seconds, it is determined whether or not the contacts of the ignition switch are off. When the off state of the ignition switch is detected, it is determined that the ignition switch is normal and the combustion is continued. However, if the off state of the ignition switch is not detected, it is determined that the ignition switch is abnormal, and the solenoid valve is closed to stop combustion. The push time in normal operation of the push button is 5
It is considered to be a short time within seconds, and when the finger is released, the switch contact immediately turns off due to the automatic return operation of the ignition switch, and the contact of the ignition switch turns on due to warpage of the printed circuit board etc. This is because it is considered that the on state will continue for 5 seconds or more if left as it is. Therefore,
If the ON state continues for more than 5 seconds, it is determined that the ignition switch is abnormal, and the solenoid valve is closed to stop combustion.

[0004]

However, in such an operation control device for a combustor, if an ignition switch fails while the contacts of the ignition switch remain on,
Although cut at stop combustion after a certain time from the ON state, there is a problem that starts burning itself. For example, when the contacts are turned on due to moisture (moisture) and the contacts of the ignition switch are kept on, a certain period of time (for example, 5 seconds)
In the case of unattended unintentional combustion without starting combustion, and in the case where combustibles are placed near the combustor, there is a risk that the combustibles may catch fire and cause a fire.
Alternatively, the start of combustion is delayed for a certain time (for example, 5
Seconds), based on the state of the ignition switch when
If it is configured to start combustion if it is in the off state,
5 seconds of waiting time is required, and operation is normal
Even if combustion does not start immediately, the user must
There was a problem that thought it was a failure. Therefore, the present invention
The operation control device of the combustor solves the above-mentioned problem and provides an ignition switch.
Ignition switch failure with switch contacts on
In such a case, prevent the combustion from starting even for a moment.
In addition to improving disaster reliability, when the switch is normal
As soon as you let go, the ignition will be performed immediately
An object of the present invention is to provide an improved operation control device for a combustor.

[0005]

According to the present invention, there is provided an operation control device for a combustor for solving the above-mentioned problems, which burns a mixture of fuel gas and air and opens and closes a gas flow passage leading to the burner. An on-off valve, an ignition means for opening the on-off valve to ignite, an automatic return type ignition switch whose contacts are turned on and off by pushing and releasing operations, and timing when the contacts of the ignition switch are turned on. Timer means to start
When, the ignition switch is OFF in the OFF state from the ON state
When switching, refer to the timer value by the above timer means
To change from the on-state to the off-state.
Elapsed time determination to determine whether the overtime is within a certain time
If the elapsed time is within the fixed time,
The present invention has an ignition command means for issuing an ignition command to an ignition means .

[0006]

The operation control device for a combustor according to the present invention having the above-described structure is designed to be operated when the contact of the ignition switch is turned on.
The timer starts timing and the ignition switch turns on from the on state.
When switching to the off state, the elapsed time determination means
Elapsed time required to switch to the off state by referring to the value
It is determined whether the interval is within a predetermined time. And the elapsed time
Is within a certain time, the ignition command means
Command fire. In other words, the ignition is not started just when the contact of the ignition switch is turned on, but is switched to the off state.
When the on-state period is short, ignite the burner
Start burning. Therefore, release the hand during the ignition operation.
Since ignition is performed immediately, usability is improved without waiting
good. Also, if the ignition switch remains on,
In the state, the ignition is not started. Teeth may, after a predetermined time has elapsed, unexpectedly, also as an ignition switch is returned to normal, it is no longer safe because not initiate ignition.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the operation control device for a combustor according to the present invention will be described below. FIG. 2 shows a schematic configuration diagram of a gas stove. Reference numeral 1 denotes a gas stove main body. An ignition (extinguishing) switch 2, an operation lamp 3, a combustion lamp 4, and an abnormal lamp 5 are provided on a panel portion of the main body 1. The ignition (fire-extinguishing) switch 2 is composed of an automatic reset-type ignition (extinguishing) switch contact 21 and a push button 22 and also serves as a fire-extinguishing switch. .). Reference numeral 6 denotes a gas cock, and reference numerals 7 denote gas burners provided on the left and right sides. When the ignition switch 2 is pressed, an electromagnetic valve 9 is turned on and opened to enable ignition and combustion. FIG. 1 shows a schematic diagram of an electric circuit diagram of a gas stove. Reference numeral 8 denotes a driving transistor for the solenoid valve 9. Reference numerals 10 and 11 denote two power supplies for various devices which are supplied to the transistor 8, the solenoid valve 9 and the combustion control circuit 12. 13 is a microcomputer (CP.
U. ), 14 is an output port, 15 is an input port, 16 is a pull-up resistor, and when the push button 22 of the ignition switch 2 is pressed, a voltage generated in the resistor 16 is detected by the microcomputer 13 so that the ignition switch contact 21 An on / off state is detected. Then, the ON state of the ignition switch contact 21 is detected by the microcomputer 13 via the input device 15, and the operation lamp 3 is turned on.

Reference numeral 17 denotes a storage device in which programs, set times, and the like are stored. Reference numeral 18 denotes a power supply. The power supply 18 supplies necessary voltages to the microcomputer 13, the output device 14, and the input device 15. Therefore, the microcomputer 13 detects the ON state of the ignition switch contact 21 and counts clock pulses from the time point, and the microcomputer 13 measures time. Then, the microcomputer 13 compares and determines whether or not the elapsed time until the ignition switch contact 21 is turned off is shorter than a predetermined time (for example, 5 seconds) set in the storage device 17 by the microcomputer 13. (For example, for less than 5 seconds), the transistor 8
Is turned on, the solenoid valve 9 is opened, and the gas burner 7 is ignited and burned. In addition, the abnormality lamp 5 is turned on to notify an abnormality for a predetermined time (for example, 5 seconds) or more.

In the flow chart of FIG.
The microcomputer 13 detects the ON state of the ignition switch contact 21 of the above, and the operation lamp 3 is turned on to light up. Next, the off state of the ignition switch contact 21 is detected, and it is determined whether or not the time from on to off is within 5 seconds. Within 5 seconds, the solenoid valve 9 is connected via the driving transistor 8.
Is opened, a spark is blown from a spark plug (not shown), and the gas burner 7 ignites and burns. Ignition switch contact 2
If the time from the ON state to the OFF state by 1 has elapsed for 5 seconds or more, the abnormality lamp 5 is turned on through the combustion control circuit 12 to notify the abnormality that the ignition switch contact 21 remains on. I do. If the off state of the ignition switch contact 21 is not detected, the ignition and combustion of the burner 7 are not performed.

Therefore, if the failure occurs while the ignition switch contact 21 remains on, combustion of the gas burner 7 does not start, and even if the ignition switch 2 returns to normal after 5 seconds, combustion does not start. For example, when the drain (water droplet) generated by the boiling water or the combustion heat dropped in the gas stove drips on the ignition switch 2 and the ignition switch contact 21 is turned on and is not released, the combustion of the gas burner 7 is started. Does not start. After 5 seconds, the ignition switch 2
Even if the abnormal state in which the drain dripped on the liquid evaporates and remains turned on is suddenly eliminated, the combustion of the gas burner 7 does not start.

FIG. 5 shows a configuration in which the operation lamp 3 in FIG. 4 is turned off and the flow of the sequence is returned to the start point. In this case, if the ignition push operation (the push operation of the push button 22) is too long and is inappropriate, it can be said that the restart can be performed by the ignition push operation again, and the operation is effective. In addition, driving lamp 3
It is possible to display whether or not it is in a normal operation state by itself, which is advantageous in cost.

The embodiment of the present invention has been described above.
The present invention is not limited to these embodiments at all, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention. For example, although the embodiment in the gas stove has been described, the present invention can also be applied to a water heater. In this case, prior to combustion of the burner, prepurge of the inside of the body by an exhaust fan, ignition operation of a pilot burner, and the like are performed. It goes without saying. In addition, in the case of a water heater, when a drain (water droplet) drops from the heat exchanger to the switch, and when the switch becomes submerged due to water leakage, the contacts of the ignition switch are turned on and remain in a state for a certain period of time. Even if the water adhering to the contacts evaporates after the lapse of time and this abnormal state is suddenly eliminated, combustion is not started, so that safety is ensured. Also, the ignition (extinguishing) switch 2 has been described as a type in which ignition and extinguishing are alternately performed by pressing the same push button 22, but the ignition button, the ignition switch and the extinguishing button, and the extinguishing switch are separately installed. Ignition,
Obviously, the fire extinguishing may be performed by a separate push button. Further, although the case where the comparison, determination, and the like in the time control are performed by the microcomputer has been described, it may be performed by another electric circuit (component).

[0013]

As described above in detail, according to the operation control device for the combustor of the present invention, the state of the combustor is changed from the on state to the off state.
Normal operation to determine whether to start combustion at that point
If you make it, it will be ignited immediately after you release your hand, without waiting
Easy to use. In the event of a short-circuit failure of the ignition switch,
Ignition does not start after a certain time
Even if the ignition switch returns to normal, ignition will not start.
However, there is an excellent effect that reliability in disaster prevention can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an electric circuit of a combustor according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of the combustor according to the embodiment of the present invention.

FIG. 3 is a schematic piping diagram of a combustor according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating a first embodiment of the present invention.

FIG. 5 is a flowchart illustrating a second embodiment of the present invention.

FIG. 6 is a flowchart showing a conventional example.

[Explanation of symbols]

 2 Ignition switch 3 Operation lamp 4 Combustion lamp 5 Abnormal lamp 7 Gas burner 9 Solenoid valve 21 Ignition switch contact

Claims (1)

(57) [Scope of request for utility model registration] A burner for burning a mixture of fuel gas and air; an on-off valve for opening and closing a gas flow passage leading to the burner; an ignition means for opening the on-off valve to ignite; An automatic return type ignition switch whose contacts are turned on and off by operation, and the contacts of the above ignition switch are turned on
Timer means to start timing when the state is reached, and the ignition switch switches from the on state to the off state
The timer value by the timer means
And the time it takes to switch from the ON state to the OFF state
Elapsed time determination means for determining whether the time is within a certain time
And, in the case where the elapsed time is within the fixed time, the ignition hand
A combustion commander for commanding ignition of the stage .