JPH08200672A - Ignition device for combustion equipment - Google Patents

Abstract

PURPOSE: To provide an improved ignition device for combustion equipment such as a petroleum fan heater or a gas fan heater and the like in which an ignition completion period can be reduced to a half, occurrence of unburnt gas can be reduced and bad smell of fuel can be reduced. CONSTITUTION: An ignition device is for use in igniting fuel at a burner part 30 of a combustion device through an electrical discharging. There are provided a first electrical discharging electrode 50 and a second electrical discharging electrode 55 arranged to hold a burner part 30 forming a flame, and an electrical discharging generating circuit 15 for forming a first electrical discharge 60 directed from the first electrical discharging electrode 50 toward the burner part 30 and further forming a second electrical discharging 65 directed from the burner part 30 to the second electrical discharging electrode 55. With such an arrangement, it is possible to reduce an ignition period at the burner part to about a half, reduce an amount of occurrence of unburnt gas, resulting in that bad smell characteristic to keroscene can be reduced in its discharging out of the combustion equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustor such as an oil fan heater and a gas fan heater, and more particularly to an ignition device for the combustor.

[0002]

2. Description of the Related Art Conventionally, as an ignition device for a combustor of this type, one disclosed in Japanese Utility Model Publication No. 63-24369 is known. In this ignition device, as shown in FIG. 4, an electrode 2 of one spark plug is provided in the vicinity of a burner head 1 attached to a carburetor, and a discharge 3 from the one electrode 2 is provided.
Thus, the fuel of the burner head 1 is ignited.

[0003]

However, in such an ignition device, the flame formation direction by the discharge 3 is two directions indicated by a and b along the circumferential direction of the burner head 1, and the flame formation completion time ( (Ignition end time) is the time until the flame progresses in the flame formation directions a and b meet at point c, so it takes time to complete the ignition and a large amount of unburned gas in the mixture of kerosene and air is generated. As a result, there is a problem that a large amount of malodor of kerosene is generated outside the combustor.

An object of the present invention is to provide an ignition device for a combustor capable of reducing the ignition end time to about half and reducing the generation of unburned gas to reduce the bad odor of fuel.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to an ignition device for igniting fuel in a burner section of a combustor by electric discharge, wherein a first discharge electrode and a second discharge electrode are arranged so as to sandwich a burner section forming a flame. And a discharge generation circuit for forming a first discharge from the first discharge electrode to the burner portion and a second discharge from the burner portion to the second discharge electrode. It

[0006]

According to the present invention, the first discharge electrode and the second discharge electrode are arranged so as to sandwich the burner portion forming the flame, and one discharge generating circuit is used to remove the first discharge electrode from the first discharge electrode. Since the first discharge is formed in the burner section and the second discharge is formed in the second discharge electrode from the burner section, the ignition time in the burner section can be reduced to about half,
It is possible to reduce the amount of unburned gas generated, and as a result, it is possible to reduce the emission of malodor peculiar to kerosene outside the combustor.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an ignition device for a combustor according to the present invention. This embodiment discloses an example in which the ignition device of the present invention is applied to an oil fan heater as a combustor.

In FIG. 1, a discharge generating circuit 1 of the ignition device.
A capacitor C2 for charging is connected to the primary coil L1 of the step-up transformer T1 of No. 5. One end of the capacitor C2 is connected to the rectifying diode D1 and the rectifying capacitor C1, and the other end of the capacitor C2 is connected to the switching element 10 such as a transistor or FET via the current limiting resistor R1. The commercial power supply 6 is arranged between the rectifying diode D1 and the switching element 10.

The control unit 11 is, for example, a microcomputer, and is connected to the oscillation circuit 12, and the oscillation circuit 12 is connected to the switching element 10.

An ignition plug 5 is provided on the secondary coil L2 of the step-up transformer T1. Step-up transformer T1
The secondary coil L2 can provide an output with an oscillation frequency that preferably exceeds the audible frequency band to the first discharge electrode 50 and the second discharge electrode 55 of the spark plug 5. By giving the ignition plug 5 an output having an oscillation frequency exceeding the audible frequency band, it is possible to eliminate the noise of "viggle" during the ignition operation.

FIG. 2 shows the spark plug 5 and the burner portion 30 in the oil fan heater.

The first discharge electrode 50 and the second discharge electrode 50 of the spark plug 5
The burner section 30 is disposed between the discharge electrodes 55 of the above.

The burner section 30 is attached to the carburetor 31. In this carburetor 31, the electric heater is energized until it reaches an appropriate temperature, and when the temperature of the carburetor 31 detected by the thermistor reaches an appropriate vaporization temperature, combustion is started. That is, a fuel such as kerosene is supplied into the carburetor 31 through the fuel pipe and is vaporized in the carburetor 31.
The burner part 3 is obtained by mixing the vaporized kerosene and the combustion air.
It is designed to be ejected from the burner head of 0.

Next, the operation of the ignition device for the combustor shown in FIGS. 1 and 2 will be described.

When the user presses the operation button of the oil fan heater to ignite the spark plug 5, the commercial power source 6
AC voltage of 50 Hz or 60 Hz of 100 V is applied, and the AC voltage is rectified and smoothed by the rectifying diode D1 and the capacitor C1. In response to a command from the control unit 11, the oscillation circuit 12 oscillates a predetermined oscillation frequency fosc = f1 that exceeds the audible frequency band, and causes the switching element 10 to perform a switching operation. This audible frequency band is, for example, 20 Hz to 18000 Hz.

When the switching element 10 is turned on, electric charges are accumulated in the capacitor C2 and the step-up transformer T1.
Energy is stored in the primary coil L1 of the. And
When the switching element 10 is turned off, the step-up transformer T1
A high voltage of several tens of KV is induced in the secondary coil L2 of the spark plug 5, and the first discharge electrode 50 and the second discharge electrode 55 of the spark plug 5 are
Discharge is started from the burner unit 30.

Due to this discharge, the mixture of kerosene and air in the burner 4 is ignited and a flame is formed. At the time of this ignition, as shown in FIG. 3, a discharge 60 is formed from the first discharge electrode 50 to the burner portion 30, and at the same time, the burner portion 3 is discharged.
A discharge 65 is formed from 0 to the second discharge electrode 55. Alternatively, the discharge path is from the first discharge electrode 50 to the burner section 3
0 from the burner section 30 to the second discharge electrode 55.

Therefore, the flame generated by the discharge 60 spreads in the circumferential direction of the burner portion 30 along the flame forming directions d and e, and at the same time, the flame generated by the discharge 65 forms the flame forming directions f and g. Along the circumference of the burner unit 30 in the circumferential direction. From this, in the embodiment of the present invention shown in FIG. 3, compared with the conventional example shown in FIG. 4, it is possible to form a flame over the entire circumference of the burner portion 30 in about half the time. That is, by one discharge generation circuit 15 and two discharges of the first discharge electrode 50 and the second discharge electrode 55,
The ignition time in the burner unit 30 can be reduced to about half, the amount of unburned gas generated can be reduced, and as a result, the emission of a malodor characteristic of kerosene to the outside of the combustor can be reduced.

The discharge cycle is determined by the frequency of the oscillator circuit 12. In this manner, at the time of ignition, the switching element 10 is switched and discharged at a predetermined oscillation frequency fosc = f1 exceeding the audible frequency band, so that no unpleasant ignition noise is generated and the silent ignition of the burner 4 can be performed.

By the way, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the claims. That is, although the oil fan heater has been described as an example of the combustor, it goes without saying that the present invention can be applied to other types of combustors such as a gas fan heater. Further, at the time of ignition, the switching element 10 may be switched at an oscillation frequency within the audible frequency band.

In the embodiment shown in FIGS. 2 and 3, the first discharge electrode 50 and the second discharge electrode 55 of the ignition means 5 are connected to the burner section 30.
It is located at the opposite position in the diametrical direction of
Not limited to this, the first discharge electrode 50 and the second discharge electrode 55
Even if the position of is arranged in a position different from the diametrical direction,
The ignition end time can be shortened.

[0023]

As described above, according to the present invention,
The first discharge electrode and the second discharge electrode are arranged so as to sandwich the burner portion forming a flame, and the first discharge from the first discharge electrode to the burner portion is formed using one discharge generation circuit, Since the second discharge is formed from the burner section to the second discharge electrode, the ignition time in the burner section can be reduced to about half and the amount of unburned gas generated can be reduced.
As a result, it is possible to reduce the discharge of the malodor characteristic of kerosene to the outside of the combustor.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a combustor of the present invention.

FIG. 2 is an explanatory diagram showing a spark plug and a burner portion of the combustor shown in FIG.

FIG. 3 is an explanatory view showing a flame forming direction in a burner portion of FIG.

FIG. 4 is an explanatory view showing a flame forming direction in a conventional burner portion.

[Explanation of symbols]

 15 discharge generation circuit 30 burner part of combustor 50 first discharge electrode 55 second discharge electrode 60 first discharge 65 second discharge

Claims (1)

[Claims] 1. An ignition device for igniting fuel in a burner portion of a combustor by electric discharge, wherein a first burner portion arranged so as to sandwich a burner portion forming a flame is provided.
Forming a first discharge from the first discharge electrode to the burner portion, and the second discharge electrode of
An ignition device for a combustor, comprising: a discharge generating circuit for forming a second discharge from a burner portion to a second discharge electrode.