JPH0132888B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device equipped with an oxygen deficiency safety function.

Conventional Structures and Problems Generally, when a combustion device, especially an open-indoor combustion device, is used for a long time, the oxygen concentration in the indoor air decreases, resulting in an oxygen-deficient state, and carbon monoxide begins to fill the room. Therefore, it is possible to add to this combustion device an oxygen deficiency safety mechanism that detects the oxygen deficiency state or changes in the current value in the combustion flame caused by the oxygen deficiency state, or detects the carbon monoxide concentration and stops combustion. is necessary.

However, conventional oxygen deficiency safety mechanisms only stop combustion when an oxygen deficiency occurs, and are not designed to slow down oxygen deficiency.

Therefore, when used in a small room, the user must frequently ventilate and perform reburning operations, making it difficult to use.

Purpose of the Invention It is therefore an object of the present invention to improve the ease of use.

Structure of the invention To achieve the above object. For example, when the oxygen concentration decreases and combustion stops at 17.5%, the amount of combustion is reduced before that to slow down the progress of oxygen deficiency, and this is done when the indoor temperature exceeds a certain value. This is done by detection.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention applied to a wick-type open type oil hot air fan will be described below.

In FIG. 1, reference numeral 1 denotes a combustion tube, and the combustion state of the combustion flame emitted from the tube is detected by an oxygen deficiency sensor 2 installed near the combustion tube. When you turn the knob 3 of this combustion appliance to the right, the wick 1a
As the cam rises, the cam is fixed by the electromagnet 4, and at the same time, the switch 5 is closed.

A cylindrical guide plate 6 is attached above the combustion tube 1, and an electric motor 9 having a fan 8 is attached to a top plate 7 above the guide plate 6. There is a lamp wick 1a inside the combustion tube 1, which is moved up and down by the rotation of the knob 3 as described above, and when it is in the upper position, it is ignited by the ignition means to start combustion. At this time, the fan 8 is rotated by the electric motor 9, so that the indoor air A is guided into the interior through the grill 10 on the back side. This wind passes between the guide plate 6 and the exteriors 11 and 11' and exits into the room again through the front grille, but this wind creates a negative pressure between the combustion tube 1 and the guide plate 6, so that This becomes a flow of exhaust gas, and this flow forms a flow of combustion air C inside the combustion tube 1. That is, the rotation of the fan 8 causes the combustion air C to flow as shown in the figure. Therefore, as the rotational speed of the electric motor 9 increases, the amount of combustion air increases, and the amount of combustion in the combustion tube 1 also increases. In addition, the indoor temperature is detected by a thermistor 13 located inside the grill 10 on the back side. The room temperature is set using a volume 14.

Next, the characteristics of the oxygen deficiency sensor 2 are as shown in FIG. 2. As the combustion state changes depending on the oxygen concentration, the resistance value changes, and the higher the oxygen concentration and the better the combustion state, the larger the resistance value becomes.

FIG. 3 shows an embodiment of the control circuit, and its configuration and operation will be explained below.

The AC power supply 15 forms a closed loop including the switch 5-point a, the diode 16-point b, the resistor 17-point c, and the smoothing capacitor 18-d. c-
Between point d is a DC control power supply, the voltage is determined by Zener diode 19, oxygen deficiency sensor 2 - point e - resistor 20, resistor 21 - point f - resistor 22, resistor 2
3 - Point g - Resistor 24, Resistor 25 - Point H - Capacitor 26, Resistor 27 - Point i - Resistor 28, Relay 29
- point j - transistor 30, resistor 31 - volume 14 - resistor 32, thermistor 13 - point k -
Resistor 33, relay 34 - 1 point - transistor 35
Connect each series circuit. Connect the positive and negative inputs of the operational amplifier 36 from the fe point, and connect the resistor 37 between the output point m and the f point, and the resistor 38- from the m point.
The circuit of point n and resistor 39 is connected to point d, the base and emitter of transistor 40 are connected to point nd, and the collector is connected between the electromagnet 4 and point b. A resistor 42 is connected between the output point q and the output point p of an operational amplifier 41 which receives the slider points p and k of the volume 14 as negative and positive inputs.
In addition, an operational amplifier 43 whose positive and negative inputs are the k-g points.
A series circuit of a resistor 44 and a diode 46 is connected from the output point r to the base point s of the transistor 35. From point i-h, a resistor 48 is connected between the positive and negative inputs of the operational amplifier 45, between the output point t and i, and from point t, a resistor 49 is connected between point U and resistor 50 is connected between point d. Connect the igniter 51 and the contact 29' of the relay 29 in series a
- Connect between points d. The positive and negative inputs of the operational amplifier 41 are connected to the point k and the sliding terminal p of the volume 14, and from the point q, the resistor 52, the point s, and the resistor 53 are connected to the point d. From point a, the center line of the electric motor 9 - the strength terminals 34a, 34b - the connection 3 of the relay 34
Connect 4' to point d. Note that the diode 55,5
6, 57, and 58 are for ensuring operation. The operation and operation of this device and circuit will be explained. First, when the lamp wick 1a is raised by turning the knob 3 clockwise, the switch 5 is closed by the cam mechanism. At this time, the electromagnet 4 locks the knob 3 so that it does not rotate back. A direct current is generated between c and d, and charging of the capacitor 26 via the resistor 25 is started. Initially, the charging potential of the capacitor 26 is low and the output point t of the operational amplifier 45 is high, so the transistor 30 is turned on and the relay 29
closes the contact 29' and the igniter 51 operates, igniting the lamp wick 1a'. When the capacitor 26 is charged and the point h exceeds the point i, the igniter 51 stops, and the ignition operation ends. The characteristics of the oxygen deficiency sensor 2 are as shown in Figure 2. When the oxygen concentration is high and the combustion characteristics are good, the resistance value is large and the point e is low, so the output m of the operational amplifier 36 is high. It is becoming. Therefore, the transistor 40 is turned on, so the solenoid 4 continues to operate.

Next, set the temperature by volume 14 to 30℃,
If the room temperature is 15°C, the output of the operational amplifier 41 is low at point q, and the transistor 35 is OFF, so the contact of the relay 34 is on the 34b side.
The fan 9 rotates strongly and burns a large amount.

Next, consider a case where, for example, ventilation occurs and the oxygen concentration in the room decreases. As can be seen from FIG. 2, when a tin oxide based sensor is used for the oxygen deficiency sensor 2, the resistance value decreases as the oxygen concentration decreases, and first, the input point e of the operational amplifier 36 gradually rises.

However, since combustion continues without ventilation before that, the indoor temperature also begins to rise, so the resistance value of the thermistor 13 gradually decreases to 27.5℃.
When the point k exceeds the potential of the point g, the output of the operational amplifier 43 at the r point becomes high, the transistor 35 turns on, the contact falls to the 34a side, and the combustion becomes weak.

Therefore, as the oxygen deficiency progresses and the indoor temperature rises, combustion becomes weaker, so the progress of the oxygen deficiency is delayed, the electromagnet 4 operates, and combustion does not have to stop in many cases.

Of course, if the thermo circuit is set to 25°C, the operational amplifier 41 operates the temperature control function, which normally turns weak at 25°C and becomes strong again when the temperature drops to 24°C.

In this way, normally the temperature can be adjusted up to about 27.5℃, but above that it automatically turns weak. The reason why we made it possible to set the room temperature to a high temperature of 30 degrees Celsius is because if you want to raise the indoor temperature rapidly, it is better to set it to the maximum setting so that the temperature will rise faster.

Effects of the Invention The present invention automatically reduces the combustion amount to delay the progress of oxygen deficiency before combustion stops due to oxygen deficiency in a combustion device equipped with an oxygen deficiency sensor, so ventilation and subsequent re-ignition operations are performed. The number of circuits is reduced, making it easier to use.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a combustion device according to an embodiment of the present invention, Fig. 2 is a characteristic diagram of the same oxygen deficiency sensor, and Fig. 3 is a sectional view of a combustion device according to an embodiment of the present invention.
The figure is the same circuit diagram. 1... Combustion tube (combustor), 2... Oxygen deficiency sensor,
8... Juan, 13... Thermistor.

Claims (1)

[Claims] 1. An open-type combustor that heats a room; a stop means that stops combustion in the combustor in the event of oxygen deficiency; A combustion device equipped with a reduction means for forcibly reducing the