JPS6128892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device having an oxygen deficiency sensor, and its purpose is to prevent a safety device from inadvertently operating due to a detection signal from the oxygen deficiency sensor. It is in.

For example, if you use a combustion device such as a kerosene stove for a long time, the room will gradually become deficient in oxygen, so in this type of combustion device, an oxygen deficiency sensor is installed above the combustion part to prevent oxygen deficiency. When the vehicle advances, a safety device is activated to stop combustion in the combustion section, or an alarm is issued by an alarm means.

However, since the flame in the combustion section fluctuates, the temperature of the oxygen deficiency sensor changes greatly each time, causing the problem that the safety device may be activated inadvertently even though there is no oxygen deficiency condition.

Therefore, the present invention solves the above problems by providing an oxygen deficiency sensor inside the catalyst case.

An embodiment of the present invention will be described below based on the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a box-shaped main body case, and the upper front side of the main body case 1 is an opening 2.

Also, inside the main body case 1 is a combustion section 3 of a known petroleum type (or gas type) having a triple cylinder structure and a lamp wick.
is provided.

Above the combustion section 3, there is a second
As shown in the figure, a cylindrical catalyst case 4 is provided, and this catalyst case 4 is supported by a top plate 6 by fitting three legs 5 into holes 4a provided in an upper flange portion 4A.

In addition, there are many disc-shaped holes 7a in the catalyst case 4.
A catalyst body 7 is provided.

Further, in the catalyst case 4, below the catalyst body 7, an oxygen deficiency sensor 8 made of an oxide semiconductor containing tin, zirconia, etc. is supported by a support body 9.

The oxygen deficiency sensor 8 has a high resistance value under normal conditions when the O ₂ concentration is high, and as the oxygen deficiency progresses and the CO concentration increases, the resistance value decreases.Although not shown in the figure, when this resistance value decreases, the wick moves down. Safety devices are activated to extinguish the fire by causing the fire to burn, or to extinguish the fire by shutting down the shutter on the wick to extinguish the combustion, or to issue an alarm by warning means such as a lamp or buzzer.

In the above configuration, the exhaust gas from the combustion section 3 flows into the catalyst case 4 from the lower end opening as shown by the solid arrow A (arrow B is air flow) in FIG.
The water is purified and discharged outside the main body case 1 through the legs 5.

At this time, the oxygen deficiency sensor 8 detects the CO concentration in the exhaust gas, and when ventilation is not performed and the O ₂ concentration in the room decreases and the CO concentration increases, that is, when the oxygen deficiency condition progresses, the safety device is activated.

In this state before the safety device operates, the oxygen deficiency sensor 8 flows into the catalyst case 4 and detects the CO concentration of the stagnant exhaust gas, so it immediately detects the CO concentration of the exhaust gas rising from below. Compared to detection, the detection signal is less unstable.

Furthermore, since it receives heat from the catalyst body 7, temperature fluctuations in the oxygen deficiency sensor 8 are reduced, and as a result, fluctuations in the detection signal are extremely small, and the safety device is prevented from operating inadvertently.

Figure 3 shows this state, where line A shows the detection signal of the oxygen deficiency sensor 8 of this embodiment under normal conditions as a voltage value, and line B shows the signal when the catalyst case 4 is not installed. As is clear from this, in this embodiment, the detection signal of the oxygen deficiency sensor has little fluctuation, and the safety device does not operate inadvertently during normal operation.

As described above, according to the present invention, the detection signal of the oxygen deficiency sensor does not fluctuate, so the safety device does not operate unexpectedly during normal operation, and is highly reliable.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a combustion device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of essential parts of the same device, and FIG.
The figure is a characteristic diagram of the same device. 3... Combustion part, 4... Catalyst case, 7... Catalyst body, 8... Oxygen deficiency sensor.

Claims (1)

[Claims] 1. A combustion section, a catalyst case provided above the combustion section, a catalyst body provided within the catalyst case, and an oxygen deficiency sensor provided below the catalyst body within the catalyst case;
A combustion device comprising a safety device operated by a detection signal from the oxygen deficiency sensor. 2. The combustion device according to claim 1, wherein the safety device includes a stop mechanism that stops combustion in the combustion section. 3. The combustion device according to claim 1, wherein the safety device is constituted by an alarm means that issues an alarm.