JP2003329215A - Ignition electrode for gun type burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition electrode for a gun type burner, allowing installation of a pair of ignition electrodes while always securing a constant discharge gap between the ignition electrodes. <P>SOLUTION: This ignition electrode has the pair of ignition electrodes 17 igniting fuel sprayed from a nozzle body 8 provided inside a burner inner cylinder 4. The ignition electrode 17 is formed by a discharge part 18 and an insulator part 19 covering an electrode portion. The insulator part 19 is formed with a polygonal installation part 20, and has a fixing metal bracket 21 sandwiching two faces of the installation part 20 for the fixing. Because the discharge gap 22 between the ignition electrodes 17 is secured by fixing the installation part 20 by the bracket 21, the ignition electrodes 17 are installed in front of the nozzle body 8 while certainly maintaining the discharge gap 22. Thereby, adjustment by a worker is not required in assembly to simplify assembling work, and certain ignition is always executed to allow safe use. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an ignition electrode of a gun type burner used as a burner of a household water heater or the like. 2. Description of the Related Art Conventionally, in this type, FIG.
As shown in FIG. 6, a pair of ignition electrodes 102 and 103 are provided in front of a nozzle body 101 for spraying fuel, and spark discharge is performed between the ignition electrodes 102 and 103 to ignite the spray fuel. Mounting portions 106 and 107 formed by the insulator portions 104 and 105 of the ignition electrodes 102 and 103, respectively.
Had a cylindrical shape, which was difficult to position during mounting. [0003] In this conventional apparatus, the discharge gap 108 between the pair of ignition electrodes 102 and 103 is important. If it is too long, it becomes difficult to spray the fuel on the discharge part, and it is impossible to ignite the same. Therefore, it is a problem how to ensure the discharge gap 108. Conventionally, adjustment by an operator at the time of assembly is necessary. This resulted in a decrease in work efficiency, which was a major problem. In order to solve the above-mentioned drawbacks, the present invention focuses on this point. In particular, the present invention is directed to a structure in which fuel sprayed from a nozzle body provided inside a burner inner cylinder is used. In a pair of ignition electrodes to be ignited, the ignition electrode is formed by a discharge part and an insulator part covering the electrode part, and further, a polygonal attachment part is formed on the insulator part, and two surfaces of the attachment part are formed. Is provided, and a fixing gap is provided between the pair of ignition electrodes by fixing the mounting portion with the fixing bracket. According to this, since the pair of ignition electrodes are attached to the front of the nozzle body while securely maintaining the discharge gap, adjustment by an operator at the time of assembling is unnecessary, and the assembling work is simplified. It can be used reliably with reliable ignition. FIG. 1 is a perspective view of a gun-type burner according to the present invention. FIG. Reference numeral 1 denotes a burner outer cylinder having a bottomed cylindrical shape narrowed in three stages toward the tip, and an upper portion formed with an inlet 3 through which combustion air from a blower 2 fixed outwardly flows. Reference numeral 4 denotes a burner inner cylinder provided with a tapered secondary air passage 5 formed between the burner outer cylinder 1 and the burner outer cylinder 1. A nozzle body 8 is connected and sprays fuel oil pressure-fed from an electromagnetic pump 7 into the rectifying cylinder 6, and a part of air supplied from the inflow port 3 flows into the upper surface of the rectifying cylinder 6 as primary air. A plurality of primary air holes 9 are provided. Reference numeral 10 denotes a burner inner cylinder 4 in front of the nozzle body 8.
The stabilizer provided in the inside, the injection hole 11 in the center
A plurality of swirling blades 12 for swirling and supplying primary air are provided on the outer periphery of the injection hole 11, and a plurality of flow holes 13 are provided on the outer periphery of the swirling blade 12. Reference numeral 14 denotes a secondary air hole formed in the peripheral wall of the burner inner cylinder 4 in front of the stabilizer 10 and has a plurality of large and small holes.
The secondary air passage 5 on the outside is narrowed by one step. Reference numeral 15 denotes a flame-holding air outlet formed by a gap between the burner outer cylinder 1 and the burner inner cylinder 4 for supplying tertiary air to the flame formed at the final end of the secondary air passage 5. The tip end of the burner inner cylinder 4 projects forward from the burner outer cylinder 1 and is inclined slightly outward to form a guide piece 16 for guiding the flame holding air. Reference numeral 17 denotes a pair of ignition electrodes whose front ends face the front of the nozzle body 8. The ignition electrodes 17 are formed by a needle-like discharge section 18 on the front side and an insulator section 19 covering the electrode section on the rear side. The part 19 is formed with a polygonal mounting part 20 which is a quadrangle in this case. Reference numeral 21 designates a fixing bracket for simultaneously contacting and fixing at least two surfaces of the mounting portion 20 of the ignition electrode 17 for simultaneously fixing a pair of ignition electrodes 17 to the outer wall of the gun type burner. The discharge gap 22 is always kept at a good interval. Reference numeral 23 denotes a can body wall of a water heater or the like having a gun type burner attached downward. Next, the operation of the embodiment of the present invention will be described. If the blower 2 and the electromagnetic pump 7 are driven now, primary air is supplied into the burner inner cylinder 4 through the primary air hole 9, and fuel oil is sprayed from the nozzle body 8,
The primary air that has been swirled by the stabilizer 10 is mixed with the sprayed fuel and ignited by the discharge of the ignition electrode 17 to perform primary combustion. The flame after the primary combustion is subjected to the secondary combustion by the secondary air supplied from the secondary air hole 14 at the tip of the burner inner cylinder 4 through the secondary air passage 5, and a large flame is directed outward. Is formed. The flame is supplied with flame-holding air from the flame-holding air outlet 15. However, the secondary air passage 5 is blown out because the secondary air passage 5 is sufficiently narrowed to reach the flame-holding air outlet 15. Since the flow rate of the tertiary air is extremely high, and furthermore, it is reliably guided to the outside of the flame by the guide piece 16, the wrap around the burner outside the flame is prevented. Therefore, it is possible to reliably prevent soot accumulation due to the wraparound of the outside of the flame, which is likely to occur particularly when the gun-type burner is used with the gun-type burner attached downward, and good combustion is always performed for a long period of time. It can be used with confidence. The fixing of the pair of ignition electrodes 17 is performed by previously determining the fixing position of the square mounting portion 20 and the shape of the discharge portion 18. The discharge gap 22 between the two ignition electrodes 17 is securely held, and the discharge portion 18 is provided at a predetermined position of the nozzle body 8, so that adjustment by an operator at the time of assembling is unnecessary, and the assembling work is simplified. In addition, reliable ignition is always possible and can be used with peace of mind. As described above, according to the present invention, since the pair of ignition electrodes is attached to the front of the nozzle body while securely maintaining the discharge gap, adjustment by the operator during assembly is unnecessary. , Assembling work is simplified,
It can always be used for reliable ignition and safe use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a gun type burner to which one embodiment of the present invention is applied. FIG. 2 is a plan view of the ignition electrode. FIG. 3 is a front view of the ignition electrode. FIG. 4 is a sectional view of a gun type burner showing a conventional example. FIG. 5 is a plan view of the conventional ignition electrode. FIG. 6 is a front view of the conventional ignition electrode. [Description of Signs] 4 Burner inner cylinder 8 Nozzle body 17 Ignition electrode 18 Discharge part 19 Insulator part 20 Mounting part 21 Fixture 22 Discharge gap

Claims (1)

Claims: 1. A pair of ignition electrodes for igniting fuel sprayed from a nozzle body provided inside a burner inner cylinder, wherein the ignition electrode covers a discharge part and an electrode part. A pair of ignition electrodes by forming a polygonal attachment portion on the insulator portion, and providing a fixture for fixing the attachment portion, and fixing the attachment portion with the fixture. An ignition electrode for a gun-type burner, wherein a discharge gap between them is ensured.