JPS6069424A - Kerosene burner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to oil burners such as oil fan heaters.

Structure of the conventional example and its problems A conventional oil combustor, for example, an oil fan heater, has an oil tank 3 and a burner 4 inside an external device as shown in FIG. A blower motor 5 and a blower fan 6 installed on the back side of the exterior form indoor air B and warm air C into the room from a looper 7 on the front, and there is a blower port 9, where premixed vaporization is carried out through this mesh. The oil is ejected and sparks from the ignition electrode 10 into the mesh, igniting it and creating a combustion flame 11. A flame rod 12 is installed so as to hit this flame and monitor the combustion flame. 3 is an example of a conventional control circuit. AC power supply 1
3 constitutes a closed circuit with eight points - relay contact 14 - burner heater 15 - point b - operation switch 16. a-b
A second relay contact 17 - a parallel circuit of the blower motor 5 and a burner motor 18 is connected between the points, and a third contact 19 - point 0 - an oil pump 20 is connected. A high voltage igniter 21 is connected between points c and b, and a control circuit 22 including a relay control and safety device is connected between points a and b. Further, a DC constant voltage source 23 generated by this control circuit forms a closed loop with 6 points - resistance 24 - point e - resistance 25 - 1 point. The other AC power source 26 has one end connected to a protective resistor 27, a point g, a parallel connection of a resistor 28 and a capacitor, one point, a flame rod 12, and a burner 4 to form a closed loop. Nao g
, and the output point of the operational amplifier 30, which has positive and negative inputs at points e, sends a signal to the control circuit 22.

To explain the operation of this device, when the power switch 16 is closed, the heater 15 is turned on to the burner 4 by the action of the control circuit 22.
The vaporizer inside is heated and maintained at a constant temperature. For this reason, the oil sent by the pump 20 is vaporized by the vaporizer and excessively mixed with the air sent by the burner motor 18,
It is ejected from the ejection mesh 9. At this time, the ignition electrode 10 flow is caused by the igniter 21. Therefore, capacitor 2 in Figure 3
A charging voltage is generated across the terminals of the resistor 28! ll is determined to a certain value. -Running voltage power supply 2a resistance division point e
Although the point is fixed at a constant value, the flame loft current changes depending on the combustion condition. It rises like this and the output point becomes high. And when there is a lack of oxygen, there is oil.

There is no problem under normal conditions like this, but when the outside temperature becomes low, especially between 0 and -20℃, it becomes difficult to raise the temperature because the air density varies by 4% and the oil flow rate is vaporized. As the combustion progresses, there will be excess air. Therefore, the combustion flame tends to lift, the flame loft current decreases, and g
The point potential becomes stable at about point e. In this way, there are cases where even a normal sequence does not work. In reality, the position of the 8 points (e) is well determined under normal conditions, oxygen deficiency, ignition, misfire, etc., but when the temperature becomes low, the overall value of the g point becomes approximately Since the point e does not change, there is a drawback that combustion cannot be detected at low temperatures, resulting in ignition failure.

OBJECTS OF THE INVENTION The present invention was made in view of the above-mentioned problems, and an object of the present invention is to reduce excess air at low temperatures to prevent ear firing errors from occurring.

Structure of the Invention In order to achieve the above object, the present invention has a structure in which the rotational speed of the burner motor is changed to eliminate the influence of ambient temperature.

DESCRIPTION OF THE EMBODIMENTS One embodiment will be explained below with reference to FIGS. 5, 6, and 7. First, FIG. 5 shows its control circuit, and (a) is exactly the same as circuit 2 of the conventional example, except that the burner motor 18 portion is now a burner motor circuit 18'. This burner motor circuit 1σ will be explained in detail with reference to FIG. In Fig. 5(b), this circuit 1σ
forms a closed loop with three points from the AC power supply 13', the burner motor 18, and the diode bridge 31. A point on the positive side of the diode bridge 31, a point on the thyristor 32, and one point on the negative side of the bridge 31 form a closed loop. From 3 points, diode 33-resistance 34-m point-zener die yl
--Connected to point t'35-1. The Zener diode 35 has a smoothing capacitor 36, a light emitting diode 38 of the photointerrupter 37, a protective resistor 39, and a resistor 40-.
N-point transistors 41 are connected in parallel. From point n to capacitor - 0 point - diode 43 (0 point side power sword) is 1 point, diode 4 of 0 point side anode
4-2 points - Connect the capacitor 45 to the point P, connect the 46L resistor 47 between the P-points, and the resistor 48-R point to the resistor 4.
Connect 9 circuits to 1 point. From point k, 18 points of resistance -
The zener diode 51 is connected to one point, the S point to the resistor 52- to the capacitor 53k1 point, and the 8th point to the diode 54'it point of the 8th point side cand. The output point U of the operational amplifier 55, which uses the switched points t and r as positive and negative inputs, is connected to seven gate points of the SIRISK 32 via a resistor 56. Naori-
A resistor 57 is connected between the points.

FIG. 6 shows the burner motor 18. A disk 58 is attached to the shaft motor, and a circular hole 59 is provided around the entire circumference of the disk 58 so that light can pass through the circular hole. An interrupter 37 is attached.

Next, this circuit will be explained. When the relay contact 17 is closed under the control of the control circuit 22, a voltage is generated in the AC power supply 13' at rbl in FIG. AC voltage is 3 points -
Burner motor 18 - point on bridge - side IJ star 32
Due to the closed loop of point -1 and point W, the burner motor 18 is energized only when the thyristor 32 is in a conductive state. Whether this energization is performed depends on whether a voltage is applied to the gate v of the thyristor 32.

Now, diode 33 - resistor 34 - zener diode 35
, and the capacitor 36, a DC voltage is generated between the m-1 points. In addition, although the light emitting diode 38 is always lit, the circular hole plate 58 causes the transistor 41 to
Light with a frequency proportional to the number of revolutions enters the , so the n point is ON - FF'i (repeatedly. As a result, the capacitor 42, which has a relatively small capacity, is turned on when the n point is high. In the resistor 40 - capacitor 42 - diode 44 - capacitor 450 circuit, a current sufficient to fill the capacitance of the capacitor 42 flows, and the capacitor 45 is charged with this current.

When the n point is low, the battery is discharged in the 1.l.rangemeter 41-diode 430 circuit, and the same charging current flows again at the next charging time. In this way, a circuit is formed in which the charging current resolved by the capacitor 42 and the resistor 40 is integrated into the capacitor 45. When the charging voltage at point P reaches a certain value, it is discharged by the combined resistance value of resistors 48, 49.47 and thermistor 46, and therefore the voltage at point P is determined in proportion to the rotation speed of the motor. . Next, the operation of the thyristor 32 will be explained using FIG. 7. First, FIG. 7 is a diagram before the thyristor 32 between points ta+ and -J1 becomes conductive, and a DC residual voltage is generated and applied between the anode and cathode of the thyristor 32.

Also, at the 6th point, the Zener diode 51 and the resistor 50 create a waveform fbl that is almost a rectangular wave, and during this half cycle, the resistor 52 and the capacitor 53 create a charging waveform of the capacitor 53 at the 1st point like 101. It will come as it is. (It is discharged every half cycle by the diode 54.) Next, as mentioned above, the voltage at point r is determined by the temperature and the rotation speed of the motor 18, and the voltage is applied to a straight line like idl.
(!: has become. Figure (1) shows this along with the iC1 diagram. Here, the charging waveform of the capacitor 53 is expressed at the intersection point t of the characteristic and the reference voltage r, and the output point U of the operational amplifier 55. becomes high, and the Saili-get 32 becomes conductive.t
The solid line in the el diagram shows this state, and at the burner motor 18, where the quarter shape is an AC waveform (as shown by the solid line in the f1 diagram).

Assuming that the temperature decreases, the resistance value of the thermistor 46 increases, and therefore the voltage at point P =; -ro, then the intersection t. is t
Therefore, the waveform at tel becomes like the dashed line, and the waveform applied to the burner motor in (f) also becomes like the dashed line. Therefore, the rotation of motor 18 decreases. That is, the rotation speed of the burner motor 18 is determined by the resistance value of the thermistor 46.

By the way, although this is not directly related to the purpose of this article, since we are using a feedback circuit like this, let's consider a case where the voltage suddenly increases.The number of revolutions increases, the number of pulses increases, and the capacitor 45 is charged. Although the voltage tends to rise, since the constant of P (resistance value and capacitor capacity) is constant, the conduction angle of the cyrisk 32 becomes smaller by that much, and the rotation speed eventually becomes constant. Since the rotation speed is determined by the constant of P in this way, it is also effective against voltage fluctuations and frequency fluctuations.

Effects of the Invention As is clear from the description of the embodiments, according to the present invention, when the temperature changes, the rotation speed changes accordingly, so combustion can always be maintained in a stable state, and ignition failures and mistakes can be prevented. can do.

Further, since the present invention uses a feedback circuit, it is effective against voltage fluctuations and frequency fluctuations, and has the advantage that a frequency switching damper or the like is not required.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional fan heater, FIG. 2 is a structural diagram of its burner, FIG. 3 is a circuit diagram thereof, and FIG. 4 is an explanatory diagram of its operating voltage. Figure 5(a). fbl is a circuit diagram of an oil combustor according to an embodiment of the present invention, FIG. 6 is an explanatory diagram showing a method for detecting the rotational speed of the motor, and FIG. 7 is an explanatory diagram of the same operation. 4... Burner, 12... Frame lot, 2
8...Resistor, 29...Capacitor, 18
... Burner motor, 58 ... Disc, 37 ...
・Auto-increment regulator, 46...Thermistor. Figure 1! Figure 2 --- Figure □ Stable burning wheat

Claims (1)

[Claims] A burner that vaporizes and burns kerosene, a flame rod,
A control circuit applies an alternating current voltage to the burner and the flame loft, and detects the combustion state by using the rectification phenomenon of the current flowing from the flame loft to the flame, and a control circuit that applies an alternating current voltage to the burner and the flame loft, and detects the combustion state by using the rectification phenomenon of the current flowing from the flame loft to the flame loft. the voltage obtained by the voltage converting means is changed by a room temperature sensing element, and this voltage is used to control the rotation speed of the motor to control the flame rond current. oil burner.