JP3425636B2 - Ignition device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an igniter used in a portable upper and lower wick type oil burning equipment which is widely used for heating.

[0002]

2. Description of the Related Art An ignition device for a core-up and down type oil-burning device requires a significantly large ignition energy, unlike that for a gas-burning device or a vaporizing oil-burning device.

In view of this, the conventional type of conventional ignition device is of the heater type in which the heater wire is energized to ignite it by making it red heat. That is, when igniting, the wick is raised to bring the red-heated heater wire closer to the upper end of the wick,
After checking ignition, separate the heater wire from the core. In addition, since the core up-down type oil burning equipment has the most portable oil stoves, a dry battery is exclusively used as a power source for making the heater wire glow red.

[0004]

According to the prior art, since the heater wire takes a long time to glow red and consumes a large amount of electric power during that time, the utilization efficiency of the dry battery is not always good. was there. Also,
Even if the dry battery is exhausted and ignition is impossible, no special warning is displayed, so there is a problem that it is often left as it is even though the dry battery needs to be replaced. It was Further, in the heater type, since the heater wire comes into contact with the core, there is an essential defect that the heater wire is easily broken.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an ignition device for a petroleum-burning apparatus with a core above and below in which the utilization efficiency of the dry battery is high and the consumption of the dry battery is easily noticed by utilizing the continuous spark discharge. is there.

[0006]

SUMMARY OF THE INVENTION To achieve the above object, the structure of the present invention is a battery-powered ignition device for a core-up and down type oil burning equipment, which is a self-propelled multi-vibrator and a multi-vibrator. A switching element driven by a vibrator, a capacitor is connected in parallel to the primary side, an ignition plug is connected to the secondary side, and a step-up transformer that connects and disconnects the primary side via the switching element is provided. The resonance frequency of the primary side is set so that the discharge duration for each discharge in the spark plug is long enough, and the peak of the voltage applied to the switching element in the cutoff state is suppressed. The main idea is to set the resonance frequency on the secondary side.

The multivibrator can set the oscillation frequency to an audible frequency.

[0008]

According to the structure of the present invention, since the switching element is driven by the multivibrator to intermittently connect the primary side of the step-up transformer, the step-up transformer can generate a spark discharge in the ignition plug on the secondary side. . Further, since the spark discharge at this time is a continuous spark discharge that repeats according to the oscillation frequency of the multivibrator, it is possible to easily generate the ignition energy required for the upper and lower wick type oil combustion equipment. The capacitor on the primary side of the step-up transformer determines the frequency of the oscillating current generated on the primary side of the step-up transformer when the switching element is cut off.
Therefore, by selecting the capacitance of the capacitor and appropriately setting the resonance frequency on the primary side of the step-up transformer, the discharge duration for each discharge can be made sufficiently long.

If the oscillating frequency of the multivibrator is set to an audible frequency, the sound level during spark discharge is lowered, so that it is possible to easily check the exhaustion state of the dry battery, and it is easy to notice the exhaustion.

[0010]

Embodiments Embodiments will be described below with reference to the drawings.

The ignition device uses a battery B as a power source, and includes a self-propelled multivibrator 11 and a step-up transformer T (FIG. 1). An ignition plug P is connected to the secondary side of the step-up transformer T.

A dry battery is used as the battery B, and a capacitor C1 is connected in parallel to the battery B via a switch SW. The multivibrator 11 is fed from both ends of the capacitor C1. Therefore, both ends of the capacitor C1 are positive and negative power supply lines L1 and L2.

The output of the multivibrator 11 is connected to the base of the transistor TR1 via the diode D1 in the reverse direction. The base and collector of the transistor TR1 are connected to the positive power supply line L1 via resistors R1 and R2, respectively, and the emitter of the transistor TR1 is connected to the base of another transistor TR2.

The collector of the transistor TR2 is connected to the power supply line L1 through the primary coil N1 of the step-up transformer T, and the capacitor C2 is connected in parallel to the primary coil N1. Also, the transistor TR2
A reverse direction diode D2 is connected in parallel between the collector and emitter of the transistor, and the emitter of the transistor TR2 is connected to the power supply line L2. That is, the capacitor C2 is connected to the primary side of the step-up transformer T, and the transistor TR2 is a switching element that connects and disconnects the primary side of the step-up transformer T.

The step-up transformer T has a secondary coil N2, and a spark plug P is connected to the secondary coil N2. However, the ignition plug P is to be installed sufficiently close to the core of a petroleum-burning device having an upper and lower wicks (not shown).

Now, when the switch SW is turned on, the capacitor C1 is charged and the multivibrator 1
1 operates, the output of the multivibrator 11 has a pulse train signal S1 determined by its oscillation frequency f.
Appears (Fig. 2). Therefore, the multi-vibrator 11
While the output of is at a low potential, the diode D1 is conductive and the transistor TR1 is cut off, while while the output of the multivibrator 11 is at a high potential, the diode D1 is cut off and the transistor TR1 is conductive. . Therefore, the transistor TR2 is cut off in the former period because the base current is not supplied and becomes conductive in the latter period, so that the step-up transformer T2 is turned on.
In the primary coil N1, a sawtooth current I1 that rises when the transistor TR2 is turned on and is cut off when the transistor TR2 is cut off flows, and the repetition frequency of the current I1 matches the oscillation frequency f of the multivibrator 11.

That is, the multivibrator 11 can drive the transistor TR2 via the transistor TR1, and the transistor TR2 is a step-up transformer T.
The primary side can be interrupted. However, in FIG. 2, the current I1 becomes a high-frequency oscillating current determined by the inductance of the capacitor C2 and the primary coil N1 when the transistor TR2 is cut off, so that a sharp peak also accompanies the negative side. ing.

In this way, if the current I1 of the primary coil N1 of the step-up transformer T suddenly changes, the primary coil N1
A large voltage V1 is generated across 1
Can generate a larger voltage V2 across the secondary oil N2. Therefore, the spark plug P has a voltage V2
As a result, spark discharge can be generated. Further, the repetition frequency of the spark discharge at this time also matches the oscillation frequency f of the multivibrator 11.

When a large voltage V1 is generated across the primary coil N1 of the step-up transformer T, a corresponding large voltage Vce is also applied in the positive direction between the collector and emitter of the transistor TR2 in the cut-off state (( (Two-dot chain line in FIG. 3). However, the peak of the voltage Vce can be suppressed to be small by appropriately selecting the resonance frequency on the secondary side of the step-up transformer T. That is, in FIG. 3, the pulse width T of the voltage Vce depends on the resonance frequency of the primary side of the step-up transformer T, which is determined by the capacitor C2 and the inductance of the primary coil N1. The peak of the voltage Vce can be effectively suppressed by setting the resonance frequency to about three times (solid line in the figure). However, the resonance frequency on the secondary side of the step-up transformer T is equal to the inductance of the secondary coil N2,
It is determined by the stray capacitance associated with the secondary coil N2.

The negative peak of the voltage Vce can be suppressed by conducting the diode D2. The voltage V2 for spark discharge on the secondary side is generated corresponding to the voltage V1 on the primary side, that is, the voltage Vce.
That is, the discharge duration for each discharge in the spark plug P can be set to be sufficiently long by appropriately setting the resonance frequency on the primary side of the step-up transformer T.

In the above description, the transistor TR2
Since the primary side of the step-up transformer T is intermittently connected, any switching element other than a transistor may be used. Further, the capacitor C1 is charged by the battery B and can supply a large current to the power supply lines L1 and L2 as required. That is, the capacitor C1 prevents the terminal voltage thereof from being unduly lowered by the internal resistance of the battery B even when a load current having a large peak flows through the power supply lines L1 and L2.

The oscillation frequency f of the multivibrator 11 determines the repetition frequency of spark discharge in the spark plug P. Therefore, the oscillation frequency f is set to an appropriate audible frequency,
For example, if f≈800 (Hz) is set, the spark plug P generates a continuous discharge sound during discharging, so that the sound level of this discharge sound is lowered, so that the consumption of the battery B can be easily checked. can do.

Further, the spark plug P generates a continuous spark discharge that repeats according to the oscillation frequency f of the multivibrator 11, and can supply necessary and sufficient ignition energy for igniting the upper and lower wick type petroleum combustion equipment.

[0024]

As described above, according to the present invention, by combining the self-propelled multivibrator, the switching element and the step-up transformer, the step-up transformer is intermittently connected to the primary side through the switching element. By doing so, a spark discharge can be generated in the spark plug on the secondary side, and the spark discharge at this time is a continuous spark discharge that repeats according to the oscillation frequency of the multivibrator, and is used for igniting the oil combustion equipment above and below the core. In addition to supplying the necessary and sufficient energy, the specified energy is generated at the same time as the start of energization by the battery, and no wasted energizing time is required, so the use efficiency of dry batteries is significantly higher than that of the heater type. It has an excellent effect.

Further, by appropriately setting the resonance frequencies of the primary side and the secondary side of the step-up transformer, the discharge duration for each discharge in the spark plug is made necessary and sufficiently long and applied to the switching element in the cut-off state. The applied voltage can be suppressed to a low level.

[Brief description of drawings]

FIG. 1 Overall configuration circuit diagram

[Fig. 2] Operation explanatory diagram (1)

[Fig. 3] Operation explanatory diagram (2)

[Explanation of symbols]

B ... Battery P ... Spark plug T ... Step-up transformer C1, C2 ... Capacitor 11 ... Multivibrator

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F23Q 3/00

Claims (2)

(57) [Claims] 1. An ignition device for a core-up and down type oil burning device using a battery as a power source, comprising a self-propelled multivibrator, a switching element driven by the multivibrator, and a capacitor connected in parallel to the primary side. A step-up transformer connecting a spark plug to the secondary side and connecting / disconnecting the primary side via the switching element, wherein the step-up transformer has a necessary and sufficiently long discharge duration for each discharge in the spark plug. The resonance frequency on the primary side is determined so that the resonance frequency on the secondary side is set with respect to the resonance frequency on the primary side so as to suppress the peak of the voltage applied to the switching element in the cutoff state. Ignition device. 2. The ignition device according to claim 1, wherein the multivibrator sets an oscillation frequency to an audible frequency.