JPS5993120A - Combustion device - Google Patents

Abstract

PURPOSE:To decrease the number of times of ventilation and to increase the safety of the titled combustor by decreasing the quantity of oxygen when the concentration of oxygen decreases and putting the combustor into a compulsory weak combustion. CONSTITUTION:When a substance of a tin oxide system is used for an oxygen starvation sensor 2, the resistance value thereof decreases with the decrease in the concentration of oxygen. First, the output from an operational amplifier 41 is in a low level, and had no influence over a transistor 35. The output at a point P becomes high, and a transistor 35 is turned ON. The contact moves towards 34c (low), and the rotation of a motor 9 becomes weak. Thus, the combustor assumes a weak combustion. In other words, when the concentration of oxygen becomes approximately 19%, the combustor assumes a mode of weak combustion automatically. Next, the concentration of oxygen reduces less than that value, an operational amplifier 36 operates. Hence, the output at a point m which has been high becomes low. A transistor 40 is turned OFF. An electromagnet 4 is released of the lock of a knob 3, and rapidly lowers a wick 1a and stops the combustion. By this procedure, progress of oxygen starvation is prevented and the safety of the combustor is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion apparatus equipped with an oxygen deficiency safety function.

Conventional Structures and Problems Generally, when a combustion apparatus, especially an indoor open type combustion apparatus, is used for a long time, the oxygen concentration of the indoor air decreases and becomes oxygen deficient, and at the same time, the indoor air starts to be filled with carbon oxide. Therefore, it is necessary to add a stop means to this combustion apparatus to stop the combustion by detecting the change in the direct current value or the carbon monoxide concentration in the combustion flame caused by the oxygen deficiency state or the oxygen deficiency state.

In addition, especially in open-type kerosene stoves, there is generally a means to change the combustion state from strong to weak, so that the oxygen concentration and temperature control (hereinafter referred to as temperature control) are not particularly related. There is.

Now, as oxygen deficiency progresses, of course the oxygen concentration decreases,
Indoor temperature is also rising. However, the oxygen deficiency circuit and temperature control circuit are not directly connected, so if the outside air is extremely cold,
Therefore, if the indoor temperature does not rise much and the person goes to sleep while burning, if the indoor temperature is set to the maximum, strong combustion will still occur and will accelerate the decrease in the indoor oxygen concentration, and finally combustion will occur. will stop. If the user is not aware of this, the outside air will be cold, which will make the room cold and require ventilation, which will be inconvenient.

purpose of invention The present invention solves the above-mentioned inconvenience.

Structure of the Invention The present invention takes the above points into consideration, and when the oxygen concentration decreases and stops combustion at, for example, 17.5%, the present invention
By reducing the amount of combustion by 50% and forcing weak combustion, the rate of decrease in oxygen in the room is lowered and heating continues. Therefore, even when the outside air is cold, the number of ventilations is reduced and the equipment can be used safely.

Description of examples One embodiment will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a combustion tube, and combustion gas emitted from the tube reaches an oxygen deficiency sensor 2 installed nearby, and the combustion state is detected. When the knob 3 is rotated, the cam is fixed by an electromagnet 4, and at that time, the switch 6 is closed.

A 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 above the guide plate 6. Inside the combustion tube 1, a lamp wick 1a is moved up and down by the rotation of a foot knob 3, and when the lamp wick 1a is tilted upward, it is ignited by an ignition means to start combustion. At this time, the fan 8 is rotated by the electric motor 9, so that the indoor air is supplied to the grill 1 on the back side.
guided inside through o. This wind passes between the guide plate 6, the outer device 1, and the style plate 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. The flow of combustion gas is as shown in Narudame B. This flow is the combustion air C inside the combustion tube 1.
It is also the flow of That is, as the fan rotates 80 times, combustion air flows as shown in the figure and is discharged from the grille 12 at the front in the form of hot air. Therefore, the electric motor 9
The higher the number of rotations, the more combustion air and the more combustion amount. The room temperature is still detected by thermistor 13 located inside the grill 10 on the back side.

The temperature in the room can be controlled using a separately provided volume control (Fig. 3, 14).

Next, as shown in FIG. 2, the characteristic of the oxygen deficiency sensor 2 is that the resistance value changes depending on the oxygen concentration, and the higher the oxygen concentration, the greater the resistance value.

FIG. 3 shows a control circuit, and its configuration and operation will be explained below.

AC power supply 15 is switch 5-a point-diode 16-h
A closed loop is formed by the point - resistance 17 - point 0 - smoothing capacitor 18 - point d. Between points c and d, the stain pressure is determined by the Zener diode 19 using the DC control power supply, and the oxygen deficiency sensor 2-point e-resistance 2o, resistor 21-point p-resistor 22
, resistance 2: 3- point g - resistance 24, resistance 26 - point h -
Capacitor 26, resistor 27 - 1 point - resistor 28, relay 2
9-5 points - transistor 30. Resistance 31-Volume 1
4-Resistor 32 and thermistor 13- are connected to the respective series circuits of point-resistance 33 and relay 34-point p-transistor 36. Connect the positive and negative inputs of the operational amplifier 36 from point f-a, and connect a resistor 37 between the output point m and f, and connect the circuit of resistor 38 from point m to point n and resistor 39 to point d, and connect the transistor 4o. The pace emitter of the collector is connected to the d point and the electromagnet 4 is connected between the d points. e-9 points, si op amp 4
A resistor 42 is connected between the positive and negative inputs of 1 and the output point p and q. From point p, it is connected in series with resistor 43 and diode 44 to the base of transistor 36 at point q. From point i-h, connect the positive and negative inputs of the operational amplifier 46 with a resistor 4θ between the output point r and one point, and from the r point resistor 47-8 to resistor 48 to d.
Connect between points. The igniter 49 and the contact 2d of the relay 29 are connected in series between points a and d. Connect the positive and negative inputs of the operational amplifier 6o to the point and the sliding terminal of the volume 14, connect the resistor 51 between the points and the output point U, and connect the resistor 52-9 to the resistor 63 from the U point. Connect points.

From point a, the center line of the blower motor 54 - strength terminal 34b
, connect the contact 34a of the 34cm relay 34 to point d.

Note that diodes 55, 56, and 67.

Reference numeral 68 is for ensuring operation.

The operation and operation of this circuit will be explained.

When the lamp wick 1a is raised by rotating the knob 3, the switch 6 is closed by the cam mechanism. When , the electromagnet 4 locks the knob so that it does not rotate back. A direct current is generated between a and d, and charging of the capacitor 26 is started through the resistor 26. At first, one output point of the operational amplifier 46 is high, so the transistor 30 is turned on and the relay 2
9 closes the contact 29' and the igniter 49 operates to ignite the lamp wick 1a. When the capacitor 26 is charged and the point h exceeds the point i, the igniter 49 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, the igniter 49 stops and the ignition operation ends. Since the value is large, 8 points is low,
Therefore, the output m of the operational amplifier 36 is high, and the output p of the operational amplifier 42 is high.
is low. Therefore, the transistor 4o is ON, so the solenoid 4 continues to operate.If the set temperature for the 0th order is 26℃ and the room temperature is 16℃, the output point U of the operational amplifier 6o is low, and 1) The transistor 36 is OFF.
Therefore, the contact point of the relay 34 is on the 34b side, the rotation of the electric motor 9 is strong, and the amount of combustion is large. When the room temperature gradually rises and approaches the set value of 26℃, the operational amplifier 6o
The output point U becomes high, the transistor 36 is turned on, the contact falls to the 34a side, and the combustion becomes weak.

Next, consider a case where the oxygen concentration in the room has decreased. Second
As can be seen from the figure, when a tin oxide-based sensor is used for the oxygen deficiency sensor 2, the resistance value decreases as the oxygen concentration decreases.First, the output of the operational amplifier 41 is low, and the output that has no effect on the transistor 36 is the When point p is high, transistor 36
is turned on, the contact μ340 moves to the low side, and the rotation of the electric motor 9 becomes weak, resulting in weak combustion. In other words, the oxygen concentration is 19
%, weak combustion will automatically occur.0 Next, if the oxygen concentration decreases further, the operational amplifier 3
e is activated, the output point m, which was high until now, becomes low, the transistor 40 is turned off, and the electromagnet 4 releases the lock of the knob 3, causing the lamp wick 1a to fall suddenly and stop combustion. When the oxygen concentration reaches 0, that is, 17.5%, combustion stops.

Effects of the Invention As described above, in a combustion device equipped with an oxygen deficiency sensor, the present invention automatically weakens combustion before combustion stops, thereby preventing the progression of oxygen deficiency. You can use it with confidence because the safety device operates automatically without you even having to be aware of it.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a combustion device in an embodiment of the present invention;
Figure 2 is a characteristic diagram of the oxygen deficiency sensor, and Figure 3 is its circuit diagram.
4...Electromagnet, 9...Electric motor, 13.
...Thermistor. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 figure

Claims (1)

[Claims] An open-type combustion section that heats the interior of the room by combustion, a stop means that detects oxygen deficiency and stops combustion in the combustion section, and a combustion system that detects changes in room temperature and as the room temperature approaches the set temperature. 2. A combustion apparatus comprising variable means for varying the amount of combustion in the combustion chamber, and a reducing means for forcibly reducing the amount of combustion when the oxygen concentration is higher than a value at which combustion is stopped.