JPH0345013Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a kerosene combustion apparatus, and relates to an apparatus equipped with means for detecting contamination with gasoline or thinner.

<Prior art...Background of the invention> Combustion devices that use kerosene as the main fuel, such as kerosene stoves, are one of the most popular heating devices in Japan, and are inexpensive heating devices overseas as well. It is becoming popular as a. By the way, the safety of this combustion device is guaranteed based on the assumption that it uses kerosene, but if fuel with a low explosive point such as gasoline or thinner is mistakenly used, there is a risk of a serious accident. . This danger has recently come to be seen as a problem for wealth. Therefore, there is a need for a device that can identify the type of fuel and issue an alarm when fuel is supplied to the kerosene combustion device or before it is ignited.

<Problem to be solved by the invention...Purpose> This invention was made based on the above background.
Kerosene equipped with a means for detecting contamination of the above-mentioned fuel in order to issue an alarm or stop the operation of the combustion device if a fuel with a low detonation point such as gasoline or thinner is accidentally supplied to the kerosene combustion device The purpose is to provide combustion equipment.

<Means for solving the problem> A detection sensor consisting of two temperature-sensing elements, one of which is attached to an oil-sucking member, is disposed above the oil level in the combustion tank. The device is equipped with a detection means for detecting the incorporation of fuel with a low explosive point, such as gasoline or thinner, based on the temperature difference between the temperature sensing elements.

Furthermore, in order to improve the detection performance of the detection means, it is preferable to provide an exhaust device for discharging the gas in the combustion tank and to drive it when detecting the mixing of fuel with a low explosive point.

<Function> Of the two temperature sensing elements placed above the oil surface,
One temperature-sensing element to which the oil-sucking member is attached indicates the evaporation temperature of the oil, and the other temperature-sensing element indicates the ambient temperature. The temperature difference between the two temperature sensing elements is different between kerosene and fuels with low explosive points such as gasoline and thinner, and by detecting the temperature difference, it is possible to detect the contamination of fuels with low explosive points such as gasoline and thinner. be able to.

Further, when the vapor of the oil in the combustion tank is removed by the exhaust device, the vapor pressure of the oil in the combustion tank is kept low and stable, thereby improving the detection performance.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 is a cross-sectional view of the essential parts of the kerosene combustion device of the present invention with a detection sensor attached, Figure 2 is an enlarged view of the detection sensor installation part of Figure 1, and Figure 3 is a sectional view of the kerosene combustion device of the present invention with a gasoline contamination alarm. FIG. 2 is a basic electrical circuit diagram showing an example of an electrical circuit when used for.

In the figure, 1 is a cartridge fuel tank, and 2 is kerosene in a combustion tank 3, which is replenished from the fuel tank 1 by the amount consumed in the combustion wick 4, so that a constant amount of oil is always maintained. Reference numeral 5 denotes a detection sensor attached to the ceiling wall of the combustion tank 3, and a detection sensor with approximately the same characteristics is placed facing the mounting hole 3a drilled in the ceiling wall and positioned several mm above the liquid level. two thermistors (temperature sensing elements) 6, 7, a liquid fuel suction cloth 8 attached to one thermistor 6,
It consists of a substrate 9. The detection sensor 5
It is preferable to arrange the thermistors 6 and 7 at a position where no temperature difference occurs between the two thermistors 6 and 7 due to other heat sources, regardless of whether they are during combustion or extinguishing.

When this detection sensor 5 is used for warning of gasoline contamination in a kerosene combustion device, as shown in Fig. 3, two thermistors 6 and 7 are connected to a constant voltage power supply +V _CC and ground via resistors R ₁ and R ₂ . The potential difference between the connection points A and B is amplified by the differential amplifier circuit 10, and if the output of the amplifier circuit 10 is a large output that occurs when gasoline is mixed, the transistor Tr is turned on. to light up the alarm LED 11 or sound an alarm buzzer (not shown). In the electric circuit shown in Figure 3, when kerosene is supplied, the potential difference between connection points A and B will be O _V or slightly A _V < B _V , and when gasoline is mixed in, the difference between gasoline and If the values of the resistors R ₁ and R ₂ are set so that the temperature of the thermistor 6 decreases due to the evaporation of the evaporation, and A _V >B _V , the alarm device is less likely to malfunction.

The liquid fuel detection sensor of the present invention applies the principle of a wet and dry bulb hygrometer, so when the vapor pressure in the combustion tank 3 reaches the saturated vapor pressure of the liquid fuel, the temperature difference between the two thermistors disappears and the sensor is activated. However, if gasoline is mistakenly supplied for kerosene, the vapor pressure in the combustion tank 3 will not reach the saturated vapor pressure of gasoline for a while, so a warning is sent to the user. can be emitted and the operation of combustion equipment can be stopped.

Furthermore, even if gasoline is supplied without completely running out of kerosene, the specific gravity of gasoline, 0.72, is lighter than the specific gravity of kerosene, 0.79, so gasoline will float on the surface of the kerosene, and there will be no problem in detecting gasoline.

FIG. 4 is a cross-sectional view of a main part showing another embodiment of the present invention, which is similar to the previous embodiment except that an exhaust device 12 for exhausting gas in the combustion tank 3 is disposed near the detection sensor 5. Same as example.

The above exhaust system 12 is manufactured by the applicant 201 (Nio One).
Nicknamed "type", it is the same type of odor absorbing device used in kerosene stoves, and has a structure in which the gas inside the combustion tank 3 is exhausted by the rotation of the fan.

When the exhaust device 12 is operated for a predetermined period of time when extinguishing a fire, it functions as an odor absorbing device, and when operating the ignition
When activated in conjunction with the installation operation to detect gasoline contamination, the vapor pressure of the oil in the combustion tank 3 is kept low and safe, so oil evaporates from the suction cloth 8 actively and stably. As a result, the temperature difference between the thermistors 6 and 7 of the detection sensor 5 is large and stable, and the detection performance is improved.

Note that the timing of driving the exhaust device 12 and driving the circuit that warns of gasoline contamination is determined by the timing of driving the exhaust device 12
It is preferable to drive the alarm circuit after a predetermined period of time has elapsed since the alarm circuit was driven.

<Effects> This invention has an important effect on kerosene-burning equipment, in that it can issue an alarm and stop operation in order to prevent serious accidents if the user mistakenly supplies gasoline. It is something.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the kerosene combustion device of the present invention.
Fig. 2 is an enlarged view of the detection sensor shown in Fig. 1, Fig. 3 is a basic electrical circuit diagram using the sensor of the present invention for gasoline alarm, and Fig. 4 is a diagram of a kerosene combustion device which is another embodiment of the present invention. It is a sectional view of the main part. Code, 2: Kerosene, 5: Detection sensor, 6, 7:
Temperature sensing element, 8: Member for sucking up liquid fuel, 1
0: Differential amplifier circuit, 12: Exhaust device.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A detection sensor consisting of two temperature-sensing elements, one of which is attached to an oil-sucking member, is disposed above the oil level in the combustion tank. A kerosene combustion device equipped with a detection means for detecting the presence of fuel with a low detonation point, such as gasoline or thinner, based on the temperature difference between temperature sensing elements. 2. Utility model registration claim 1, which is characterized in that an exhaust device is provided to discharge gas in the combustion tank, and the exhaust device is driven when detecting the mixing of fuel with a low explosive point such as gasoline or thinner. The kerosene burning device described in Section 1.