JPS62272014A - Combustion controlling device for combustion apparatus - Google Patents

Abstract

PURPOSE:To prevent crude gas from flowing out when a combustion apparatus is not used, by providing a switch in a controlling circuit including a microcomputer, and by opening and closing a solenoid valve which is actuated by the controlling circuit and which is controlled by a calorific value changing switch as well. CONSTITUTION:When a starter switch 7 is turned ON, an operation lamp 6 lightens. When an ignition and extinguishing button 1 is depressed, a signal by the button 1 is fed into a microcomputer 15, a relay 16 is closed to control a motor cock 9 in an open position, and a solenoid valve 8 is opened to start combustion. When a calorific value changing switch 2 or 3 is closed, the angle of rotation of a motor cock 9 is controlled to be changed by the microcomputer 15 and the calorific value is changed as well as the change is indicated by a calorific value indication lamp 4. When the ignition and extinguishing button 1 is depressed again at the end of operation, the solenoid valve 8 is closed to stop combustion. The starter switch 7 should be kept unless the combustion apparatus is used again within a short time. By cutting OFF of the switch 7, the solenoid valve 8 is not energized even if an erroneous action is caused by the microcomputer 15 because a noise is fed into a signal line and a solenoid valve driving transistor 18 is turned ON when a trouble occurs in an electronic circuit. As a result, crude gas is prevented from leaking out.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a combustion control device for gas combustion appliances and the like.

BACKGROUND OF THE INVENTION In recent years, electronic technology has been introduced to gas combustion appliances to improve convenience and safety, and the number of combustion appliances equipped with electronic control devices is increasing.

As an example, using a microcomputer (hereinafter referred to as microcomputer), by pressing a switch, it is possible to automatically open electromagnetic valves and the like to easily carry out combustion. In addition, conventionally, when switching the firepower of gas staples, etc., the firepower was adjusted by manually opening and closing the gas cock, but these manual tasks can now be done automatically using a motor and a microcomputer that controls it. It is possible.

Problems to be Solved by the Invention However, since these control circuits using microcomputers generally operate with weak current, they are extremely susceptible to noise such as external radio waves, and there are many problems such as malfunctions and leakage of raw gas. It's happening warm.

In view of the above-mentioned problems, the present invention provides a combustion control device for a combustion appliance that is convenient to use and safe even in the unlikely event of a failure of the control circuit without draining raw gas.

Means for Solving the Problems In order to solve the above-mentioned problems, the combustion control device for a combustion appliance of the present invention starts combustion and adjusts the firepower using an operation switch, and operates a control circuit including a microcomputer to operate a solenoid valve and a control circuit that includes a microcomputer. This operation is performed by driving a thermal power switching device, etc., and separately from this operation switch, a switch is provided that does not open or close the power source of the thermal power switching device or the control circuit, but only opens and closes the power source of the solenoid valve.

Function The present invention uses the above-mentioned mechanism so that even in the unlikely event of a failure of the control circuit, the power supply circuit of the solenoid valve is opened by a switch, so the control circuit will not malfunction and the raw gas will not flow out. be.

Embodiment Hereinafter, a combustion control device for a combustion appliance according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the same operation panel. 1 is an on/off button, 2 and 3 are fire power switching buttons, 4 is a fire power display lamp, 5 is a display device such as a clock, 6 is an operation lamp, and 7 is an operation switch. Moreover, FIG. 2 shows the same gas circuit diagram. 8 is a solenoid valve, 9 is a motor cock which is a motor-type thermal power switching device, and 10 is a burner. Further, FIG. 3 shows a diagram of these control circuits. 1
1 is a power outlet; 12 is a fuse; 13 is a surge absorption element; 14 is a power transformer;
4 is a fire power indicator lamp, 15 is a microcomputer, 16 is a relay,
17 is a relay contact of the relay 16, 9 is the aforementioned motor cock, 7 is an operation switch, 8 is a solenoid valve, 6 is an operation lamp,
18 is a butterfly valve U movement transinutor; 19 is a motor cock drive element; and 20 is a relay drive transinutor for the relay 16.

The operation of the control device configured as described above will be explained using the third part.

First, turn on the operation switch 7. Then, the operation lamp 6 lights up, and the solenoid valve 8 can also be energized.

Next, when the ignition/extinguishing button 1 is pressed, the signal is input to the microcomputer 15, which closes the relay 16, controls the motor cock 9 to the open position, and opens the solenoid valve 8 to start combustion. Also, when you press the fire power selector switch 2 or 3, the rotation angle of the motor cock 9 changes accordingly.
5, the firepower changes under control. In addition, when the fire power is displayed on the fire power display lamp 4 and the fire power is displayed at the end of use, when the ignition/extinguishing button 1 is pressed again, the solenoid valve 8 etc. are closed in the opposite order to the above-mentioned order, and combustion is stopped. Next, turn off the operation switch 7 if you are not going to use it immediately.

Therefore, in the event of a failure in the multiplex circuit, for example, even if noise enters the signal line of the microcomputer for the ignition/extinguishing button 1, the microcomputer 15 will malfunction because the operation switch 7 is turned off, and the solenoid valve drive transformer 7 star 18 will be turned on. Even if the solenoid valve 8 is not energized, it will not close and release raw gas. In addition, the operation switch 7 is connected to the power, switch, and switch 9 of the microcomputer 15.
Since the power is not turned off, the motor cock 9 can be turned and widened to the closed position even if the operation switch 7 is turned off during combustion.

Note that the ignition/extinguishing button 1 and the fire power switching buttons 2 and 3 are also referred to as operation switches. In addition, 21 in the figure is the motor cock 9.
This is a control circuit that controls switching of the thermal power and opening/closing of the solenoid valve 8. Furthermore, the Seiden switch 7 is also simply referred to as a switch.

Effects of the Invention As described above, since the control circuit including the microcomputer of the present invention and the switch placed in the position to open and close only the solenoid valve operated by this circuit and the solenoid valve operating the thermal power switching device are provided, the control circuit will not malfunction. However, by separately controlling the solenoid valve using a switch, it is possible to provide a safe combustion device with no raw gas leakage.

[Brief explanation of drawings]

FIG. 1 shows an operation panel diagram of a combustion appliance according to an embodiment of the present invention, FIG. 2 shows its gas circuit diagram, and FIG. 3 shows its control circuit diagram. 1.2.3 - Operation switch, 7... Switch, 8... Solenoid valve, 9... Thermal power switching device, 10...
・Burner, 15... Microcomputer, 21... Control circuit.

Claims (1)

[Claims] A control circuit including a burner, a solenoid valve and a thermal power switching device arranged in the fuel passage to the burner, and a microcomputer that controls the solenoid valve and the thermal power switching device, and this control circuit is used to start combustion. A combustion control device for a combustion appliance, comprising: an operation switch for stopping the operation; and a switch that is provided independently of the operation switch and that opens and closes only the power source of the solenoid valve.