JPS6045324B2 - Combustion control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion control device for another gas combustor of a gas stove.

Conventionally, this type of device includes a gas combustor, a gas safety valve that controls the opening and closing of a gas passage connected to the combustor, and an abnormal combustion detection element that operates by detecting incomplete combustion when the combustor lacks oxygen. The output of the element is compared with a reference voltage using a comparator, and the valve is controlled according to the output, so that in the event of abnormal combustion, the valve closes and the combustor becomes inoperable. The formula is known.

This material can achieve incomplete combustion due to changes in the flame due to lack of oxygen.

For this purpose, a delay circuit is provided to prevent the valve from closing immediately due to flame fluctuations.

As a result, its operation is delayed.

However, if the combustor is continuously used in a closed room, the oxygen shortage progresses and the room temperature rises.

Therefore, future oxygen shortages can be predicted by increases in room temperature. The object of the present invention is to provide a device that can perform safer combustion control by changing the reference voltage potential mentioned above to the safe side, that is, to the side where the valve can be closed earlier when such an oxygen shortage is predicted. The gas combustor is equipped with a gas safety valve that controls the opening and closing of the gas passage connected to the combustor, and another abnormal combustion detection element made of zirconia that is activated by detecting abnormal combustion in the combustor, and the output of the element is is compared with a reference voltage using a comparator, and the safety valve is controlled by the output of the comparator, which is equipped with a temperature-sensitive resistance element that responds to the temperature in the room in which the combustor is installed, and which is connected to the reference voltage. A circuit is intervened to adjust the voltage according to the temperature.

An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawing, 1 indicates a gas stove or other gas burner,
The combustor 1 is equipped with a gas safety valve 3 for controlling the opening and closing of a gas passage 2 connected to the combustor 1, and an abnormal combustion detection element 4 made of zirconia or other material that detects abnormal combustion and is activated. is compared with a reference voltage by a comparator 5, and the valve 3 is controlled by its output. More specifically, the safety valve 3 is of a type that is maintained in an open position by energizing an operating solenoid 3a, and is connected to a power source 7 via a transistor 6 connected to the output side of the comparator 5 mentioned above to the solenoid 3a. Furthermore, the element 4 is made of zirconia, for example, and has one side facing the main burner 1a of the combustor 1 and the other side facing the flame of the auxiliary burner 1b. to be acted upon,
Thus, during normal combustion of the main burner 1a, the flame does not come into contact with it, as shown by the solid line in the diagram, but during abnormal combustion, it comes into contact with it, as shown by the dotted line, and therefore, during normal combustion, the flame is relatively large. In other words, it was designed to provide output during normal combustion. This output is comparator 5
The reference voltage from the power source 7 mentioned above is applied to the positive terminal of the power source 7 and the reference voltage from the power supply 7 is applied to the negative terminal of the power source 7, and the two are compared. Thus, according to the relatively large output during normal combustion, Higher than the reference voltage, the transistor 6 on the output side becomes 0N, and accordingly the operating solenoid 3a is energized, the valve 3 remains open, and the combustor 1 continues to operate, but the next When abnormal combustion occurs, the output decreases and becomes lower than the reference voltage, and accordingly, the transistor 6 becomes OFF, the valve 3 closes, and the combustor 1 becomes inoperable. Although the above is not particularly different from the conventional one, according to the present invention, for example, a temperature-sensitive resistance element 8 that responds to the temperature in the room in which the combustor 1 is provided is provided.

More specifically, as mentioned above, modern houses have good airtightness, and if the combustor 1 is continued to be used with the room completely closed, the room will gradually become depleted of oxygen, which is dangerous. In this case as well, it is preferable to close the valve 3, but in this case there will also be a rise in the room temperature in the room, which is relatively noticeable due to the use of modern insulation materials, and thus Continuation of the above-mentioned use was to be detected by an increase in room temperature. In this case, for example, a thermistor whose resistance decreases as the temperature rises is used as the element 8, and this is inserted into the reference voltage circuit described above, that is, the circuit whose negative terminal is connected to the power supply 7. As the room temperature rises, the reference voltage is increased correspondingly due to a change in the resistance of the element 8. According to this increase in the reference voltage, the negative terminal side of the comparator 5 becomes high potential, and even if a relatively large output acts on its positive terminal side, the transistor 6 on the output side becomes 0FF, and thus The safety valve 3 is also closed by this. That is, even when the element 4 detects normal combustion and has a large output, if the room temperature rises, the valve 3 closes, thus preventing the risk of oxygen deficiency. The element 8 is not limited to this type, and may be of a type in which the resistance increases as the temperature rises. In this case, the voltage should be increased by changing the connection points, and The element 8 may also be of a type that uses a thermocouple to detect misfire.

In this way, according to the present invention, a temperature-sensitive resistance element that responds to the temperature in the room in which the combustor is installed is provided, and this is inserted into the reference voltage circuit to adjust the voltage according to the temperature. Therefore, especially when a combustor is used in a closed room, the oxygen concentration in the room decreases and the room temperature gradually rises.

According to this rise in room temperature, the resistance of the temperature-sensitive resistance element changes and the reference voltage of the reference voltage circuit can be adjusted to the safe side, thereby closing the safety valve earlier than the state of oxygen deficiency progresses. This has the effect of increasing safety.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an example of the device of the present invention, and FIG. 2 is a side view of an incomplete combustion detection element portion. 1... Gas combustor, 2... Gas passage,
3... Gas safety valve, 4... Abnormal combustion detection element, 5... Comparator, 7... Power supply, 8... Sensation Temperature resistance element.

Claims (1)

[Claims] 1. A gas combustor is equipped with a gas safety valve that controls the opening and closing of a gas passage connected to the combustor, and an abnormal combustion detection element such as zirconia that is activated by detecting abnormal combustion in the combustor, and the output of the element is compared. The safety valve is controlled by comparing the output with a reference voltage in the combustor, and is equipped with a temperature-sensitive resistance element that responds to the temperature in the room in which the combustor is installed, and this is connected to the reference voltage circuit. A combustion control device that intervenes to adjust the voltage depending on the temperature.