JPH0214609B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a kerosene stove that starts and stops combustion by moving the wick up and down. This system provides a safety measure that stops combustion or issues an alarm to alert you if more than a certain amount of unburned gas is generated.

As is well known, conventional kerosene heaters require caution when used in highly airtight rooms. Therefore, there is a need for safety measures that call attention to the user by detecting oxygen concentration, etc., and stopping combustion before the risk of adverse effects on the human body arises, or by issuing an alarm.

The present invention provides the above-mentioned safety means, and one embodiment thereof will be described below.

FIG. 1 shows the structure of this embodiment.
1 is a photoconductive element that detects a change in brightness of the incandescent body 2a due to incomplete combustion; 2' is a combustion cylinder having the incandescent body 2a on the top; 3 is an exterior case; 4 is an ignition heater; 5 is a case in which the dry battery 8 is housed. , 21 is an alarm lamp used as an example of a safety measure to issue an alarm when an oxygen deficiency condition occurs, and 7 is a control unit that measures the oxygen partial pressure and determines whether or not to issue an alarm. FIG. 2 shows a circuit diagram of the control section 7. The dry cell battery 8 is connected to the ignition heater 4 via a switch 9 that is closed during the ignition operation. In addition, an oxygen deficiency circuit 11 and an alarm circuit 12 are connected in parallel with the ignition heater 4 via a power switch 10.
is connected. Under normal conditions, the incandescent body 2a glows bright red due to the combustion heat of the combustion tube, and when incomplete combustion such as oxygen deficiency occurs, the amount of combustion decreases and the brightness of the incandescent body 2a decreases.

The photoconductive element 1 and the resistors 13 to 15 form a bridge circuit, and when the resistance value of the photoconductive element 1 decreases to a predetermined value or more due to a decrease in the light intensity of the incandescent body 2a, the output of the voltage comparator 16 is reversed. do. 1
7 is a low frequency oscillation circuit which becomes active when the output of the voltage comparator 16 is inverted, starts oscillating, and outputs the oscillation to the transistor 20 via the resistors 18 and 19, causing the alarm lamp 21 to dim. let

Note that in the circuit shown in FIG. 2, the maximum amount of power is consumed by the ignition heater 4, but the ignition heater 4 is only energized for a short period of time during ignition.
It does not have a large effect on the power supply life. Rather, the lifespan of the DC power source 8 is determined by the amount of power consumed by the oxygen deficiency circuit 11 and the alarm circuit 12, which should always be energized during combustion.

Therefore, in this invention, by adding a low frequency oscillation circuit 17 to the alarm circuit 12, the alarm lamp 21 is dimmed in the event of oxygen shortage, for example, turned off for 2 seconds and turned on for 1 second, thereby suppressing consumption of the current power source 8. It is set as.

In addition, the dimming of the lamp 21 has the effect of encouraging more attention than simply turning on a lamp.

It should be noted that the power switch 10 of the above embodiment may be configured with a timer contact that operates at a fixed time after the start of combustion.

In addition, the above embodiment has a warning lamp 2 as a safety measure.
Although this is an example in which method 1 is adopted, the same effect can be obtained by using a warning buzzer instead of the warning lamp 21, or combustion may be stopped.

As described above, the present invention not only has extremely high safety in the event of oxygen deficiency, but also has fewer malfunctions and has a sufficiently long lifespan for the dry cell battery that is the power source.
Moreover, since it is possible to use a dry cell power source, the portability characteristic of a dry cell power source is not compromised, and since the dry cell battery of the ignition heater is used, there is no need for a separate dry cell battery, and in the unlikely event that the dry cell battery runs out, If there is a risk that sufficient power will not be supplied to activate the oxygen deficient circuit or alarm circuit,
Since the power supply to the ignition heater is insufficient and combustion cannot be started, the user is aware of the battery consumption and has various effects, such as being able to prevent danger.

[Brief explanation of drawings]

Figure 1 is a structural diagram showing one embodiment of the present invention, Figure 2 is a structural diagram showing an embodiment of the present invention.
FIG. 3 is a circuit diagram of the control section in the same figure. DESCRIPTION OF SYMBOLS 1... Photoconductive element, 2a... Glowing body, 5... Dry cell (power supply), 21... Warning lamp (safety means).

Claims (1)

[Claims] 1. A combustion tube with a red-hot part, a photoconductive element that monitors the red-hot part of the combustion tube and detects changes in brightness caused by incomplete combustion due to lack of oxygen, and a photoconductive element whose resistance value remains constant. It is equipped with an oxygen deficiency circuit that operates when the oxygen deficiency exceeds the specified value, an alarm circuit that operates an alarm intermittently in response to the output from this oxygen deficiency circuit, and a dry battery that is the power source for the ignition heater. is an oil stove connected to supply power from this dry cell battery.