JPH07243646A - Burner ignition device - Google Patents

Abstract

PURPOSE:To provide a burner ignition device which can surely ignite a burner in a short time by using a voltage having less danger in handling, little consumers an ignition part, and disperses with attached equipment. CONSTITUTION:In a burner ignition device arranged freely in a reciprocal movement in a burner, a silicon nitride heater 3 is so arranged as to face a notch section 4, in an inside section of a cylindrical state carrier 1 arranged freely in a reciprocal movement in the burner and having the notch section 4 in the vicinity of a top edge, and a voltage of 100-200V grade is directly impressed to the silicon nitride heater 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner ignition device.

[0002]

2. Description of the Related Art Conventionally, as an igniter for a burner that uses liquid, gas or the like as a fuel, a device that uses a high voltage spark discharge of 2000 to 10000V, a capacitor is charged with high voltage electricity, and this is used as a semiconductor plug Various proposals have been made, such as one that uses discharge energy to intermittently discharge electricity and one that generates high heat by applying a voltage of 10 to 30 V to a silicon carbide heating element made of a sintered body of silicon carbide.

However, these devices have 2000
When using a high voltage of 10000V, in addition to the need for advanced insulation measures for the high voltage part, handling is dangerous, and when using a silicon carbide heating element that uses a low voltage of 10-30V. However, since it takes 10 seconds or more for the silicon carbide heating element to reach a predetermined ignition temperature (rise time), it takes a long time to ignite.

A device has also been proposed in which the rise time is shortened to several seconds by setting the initial voltage applied to the heating element to 1.5 to 2 times the rated voltage. It requires additional equipment such as a current relay, which complicates the device and causes thermal shock to the heating element due to rapid temperature rise, causing cracks in the heating element and shortening the life of the heating element. Was.

[0005]

SUMMARY OF THE INVENTION In view of the above problems of the conventional burner ignition device, the present invention can reliably ignite the burner in a short time by using a voltage which is less dangerous in handling. An object of the present invention is to provide a burner ignition device that consumes less ignition parts and does not require attached equipment.

[0006]

In order to achieve the above object, in a burner ignition device of the present invention, a cylindrical carrier having a notch portion near its tip is arranged in the burner so as to be movable back and forth, and the carrier is The gist of the present invention is to dispose a silicon nitride heater so as to face the cutout portion inside.
In this case, the number of silicon nitride heaters to be arranged can be one or plural.

[0007]

According to the burner ignition device configured as described above, since the silicon nitride heater is used as the heater, even if the voltage is about 100 to 200 V, which is less dangerous to handle, the voltage is simply changed. By applying it to the heater, the temperature of the heater can be heated to a temperature required for ignition of the burner in a short time of several seconds. Further, when the ignition device is not required, such as during burning of the burner, the carrier is retracted from the inside of the burner to prevent the silicon nitride heater from burning due to the flame of the burner.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiments. This burner ignition device is used by being installed in a burner (not shown) so as to be able to move back and forth, and has a cylindrical carrier 1 having a notch 4 in the vicinity of its tip, and screwed to the tip of the carrier 1. The cap 2, the silicon nitride heater 3 fixed to the inside of the carrier 1 by the support 5 so as to face the notch 4 of the carrier 1, the holder 6 for fixing the support 5 to the carrier 1, and the rear of the carrier 1. A terminal 9 for connecting the terminal casing 7 provided at the end and the end of the power supply conductor 8 of the silicon nitride heater 3 arranged inside the terminal casing 7.
Connected to the terminal 9 and connected to the silicon nitride heater 3 by 100 to 2
It is composed of a power supply unit (not shown) for directly applying a voltage of about 00V.

Silicon nitride heater 3 used in the present invention
As shown in FIG. 2, a lead wire 3b for energizing the heating element 3a is provided at the rear end portion of the silicon nitride sintered body in which the heating element 3a is embedded. The silicon nitride heater 3 has a flat plate shape having a length (L) of 54 mm, a width (W) of 4.7 mm, a thickness (T) of 1.3 mm, a heating section length (L0) of 14 mm, and a heating section area of 1.68 square cm. It has a shape of, and when a commercial power supply of AC100V is applied to this, it becomes 100 degrees Celsius.
The time required to reach 0 ° C. was 4.3 seconds, which was an extremely short time, and the saturation temperature could be heated to 1240 ° C.

The number of the silicon nitride heaters 3 may be one or plural, but in order to reliably ignite the burner in a short time, a plurality of the silicon nitride heaters 3 are provided. Is desirable.

That is, the elements necessary for ignition of the burner are
It is the contact area between the heat generation temperature of the heater and the fuel. Although the specific numerical values of these elements differ depending on the type of burner, the type of fuel, etc., as a result of experiments using an industrial heavy oil burner,
The heating temperature of the heater required to ignite the burner is 1000 degrees Celsius.
It was revealed that the contact area with the fuel was about 1 to 5 square cm. As a method for obtaining this contact area, a method of enlarging the shape of the silicon nitride heater 3 can be considered first. However, when the shape is enlarged, the time (rise time) until reaching a predetermined ignition temperature becomes large. It becomes proportionally longer, and the purpose of ignition in a short time may not be achieved.

Therefore, when a large contact area is required, a plurality of silicon nitride heaters 3 are arranged. Specifically, as shown in FIG. 3, the silicon nitride heater 3
The silicon nitride heaters 3 are attached to the support 5 so that the respective parts are arranged from the center toward the outer periphery, and the silicon nitride heaters 3 are electrically connected in parallel, so that even a large-capacity burner can be processed in a short time. Ignition can be reliably performed. Then, FIG. 3 using three silicon nitride heaters 3 shown in FIG.
Using the ignition device shown in (b), the combustion amount is 1000 kg /
It was confirmed that a C heavy oil burner having an Hr capacity could be ignited reliably in a short time.

Further, by mounting a plurality of silicon nitride heaters 3 as shown in FIG. 3, it becomes easier for fuel to contact the surface of the silicon nitride heater 3, and the lead wire 3b of the silicon nitride heater 3 is connected to the power supply conductor. The lead wire group located in the central portion of the support and the lead wire group located in the outer peripheral portion at the time of connecting with 8 may be bundled and connected to the power supply conductor 8, so that the wiring work is easily performed. There is an advantage that you can.

The support 5 and the holder 6 are made of an insulating material having heat resistance, or a suitable insulating material is provided at a contact point with the silicon nitride heater 3 and the power supply conductor 8.

Also, due to long-term use of the ignition device,
When the silicon nitride heater 3 fixed by the support 5 burns out, the holder 6 is released so that it can be replaced with a new silicon nitride heater 3. Further, the cap 2 is detachably provided so that the inside of the carrier 1 can be easily cleaned.

As means for advancing and retracting the tubular carrier 1 into and from the burner, not only manual operation but also another drive mechanism can be provided, and further, the combustion state of the burner and the drive mechanism are interlocked. You can also

When the burner is ignited by using the burner igniter having the above-described structure, the power source is operated after inserting the tip of the carrier 1 of the igniter to a predetermined position in the burner. To the silicon nitride heater 3
A voltage of about 0 to 200 V is directly applied.

As a result, the temperature of the heater can be heated to a temperature of 1000 degrees Celsius or higher required for ignition of the burner in a short time of a few seconds, and the fuel spilled from the notch 4 of the carrier 1 ignites. The burner is ignited.

Further, when the ignition device is not required, such as during burning of the burner, the carrier 1 is retracted from the inside of the burner to prevent the silicon nitride heater 3 from being burned by the flame of the burner.

[0020]

According to the present invention, it is possible to ignite the burner reliably in a short time by using a voltage which is less dangerous to handle, and to operate the ignition device very easily and safely. You can Also, since the consumption of ignition parts is small and the attached equipment can be simplified,
The entire device can be made compact and the cost of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a view showing a burner ignition device of the present invention.

FIG. 2 is a diagram showing a silicon nitride heater used in the burner ignition device of the present invention.

FIG. 3 is a diagram showing an example of a typical arrangement when a plurality of silicon nitride heaters are used.

[Explanation of symbols]

 1 Carrier 2 Cap 3 Silicon Nitride Heater 4 Notch 5 Supporting Tool 6 Holding Tool 7 Terminal Casing 8 Feeding Conductor 9 Terminal

Claims (1)

[Claims] 1. A cylindrical carrier having a notch near the tip is arranged in a burner so as to be able to move forward and backward, and a silicon nitride heater is arranged inside the carrier so as to face the notch. A burner ignition device characterized by the above.