JPH03217720A - Combustion device - Google Patents

Abstract

PURPOSE:To prevent deformation of an ignition electrode by a method wherein the ignition electrode part is located at a specified distance from a secondary air hole, the tip of the ignition electrode part is bent, and the tip of the ignition electrode part is located to a burner port plate with a distance therebetween shorter than a distance between the secondary air hole and the ignition electrode plate. CONSTITUTION:Air fed from a combustion fan 25 is divided into three systems of air for vaporization flowing through a vaporizer 13 to a mixing chamber 16, primary air flowing through an opening part 15 to the mixing chamber 16, and secondary air flowing in a secondary air cylinder 20 and jetted through a secondary air hole 24. Meanwhile, vaporized gas generated in the vaporizer 13 flows through the opening part 15 to the mixing chamber 16, air for vaporization is mixed with primary air to produce air-fuel premixture, which is jetted through a burner port 17 for combustion. Ignition is effected by means of an ignition spark generated between a tip part 23 located at a shortmost distance between the ignition electrode 22 and a burner port plate 19 and the burner port plate 19. The ignition electrode part 22 can be placed in a position where a thermal stress by the burner port plate 19 is difficultmost to produce during combustion, and deterioration of the ignition electrode can be reduced.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a combustion device.

BACKGROUND OF THE INVENTION Conventionally, the configuration of this type of combustion apparatus is as shown in FIG. The configuration will be explained below with reference to FIG.

When igniting a flame hole plate 19' as shown in Fig. 5, if the flame hole plates 19' at both ends are ignited, the air-fuel mixture will be affected by metal etc. on the sides, and the amount of air-fuel mixture will increase. The ignition characteristics deteriorated as the mixture became thinner and the air-fuel mixture became less concentrated, and the distribution of the air-fuel mixture deteriorated. Therefore, the ignition electric scraper 22
In order to improve the ignition performance, ignition is not carried out at the flame hole plates 19' at both ends, but is ignited at the next flame hole plate 19'. Therefore, the rectangular flame hole plates 19 and 2
It is configured to cross over the next air hole tube 20''.

As a result, the ignition electrode section 22" is affected by the flame located at the flame hole plate 19° and receives thermal stress. As a result, the ignition electrode section 22" is deformed, causing the spark to no longer fly or leaking. did.

Problems to be Solved by the Invention In such a combustion device, the ignition electrode portion is easily deformed due to thermal stress, and as a result, the ignition device cannot perform the function of emitting sparks necessary for the ignition device.

The present invention solves the above problems and provides a combustion device having a structure in which the ignition electrode part does not deform.

Means for Solving the Problems In order to solve the above problems, the combustion device of the present invention includes a mixing chamber formed with an opening facing the outlet of the carburetor, and a mixing chamber formed at the open end of the mixing chamber in the longitudinal direction. A flame hole plate that is divided into a plurality of pieces and has a large number of flame holes opened, a secondary air cylinder provided in contact between these flame hole plates, and this secondary air cylinder communicates with the opening. a secondary air chamber opened in the circumferential surface of the secondary air cylinder, and an ignition electrode section spaced apart from the secondary air hole by a certain distance; This problem is solved by placing the tip of the ignition electrode part on the flame hole plate at a distance shorter than the distance from the secondary air hole.

Operation The present invention attempts to perform combustion with the above-described configuration so that the ignition electrode portion is not affected by heat.

EXAMPLE Hereinafter, a combustion apparatus according to an example of the present invention will be explained based on the accompanying drawings.

In FIGS. 1 and 2, reference numeral 13 denotes a vaporizer, and a mixing chamber 16 having an opening 15 opposite to the outlet 14 of the vaporizer 13 is provided. 17 is a large number of flame holes, and a mixing chamber l
It is opened at the open end 18 of 6 and into a flame hole plate 19 which is divided into a plurality of pieces in the longitudinal direction.

Reference numeral 20 denotes a secondary air cylinder, which is provided between and in contact with each of the flame hole plates 19. 21 is an air chamber, which communicates with the opening l5 and the secondary air cylinder 20. The mixture exits from the flame hole plate 19 and burns. As shown in FIG. 3, 22 is an ignition electrode part, and the parts other than the tip 23 are located above the secondary air cylinder 20 at a certain distance as shown in FIG.
is bent and extended to the flame hole plate 19 which is not located at both ends, and is at a distance shorter than the distance from the secondary air cylinder 20 to the flame hole plate l9.

In the above configuration, combustion begins with air sent from the combustion fan 25, vaporizing air flowing into the mixing chamber 16 through the carburetor I3, primary air flowing into the mixing chamber 16 from the opening l5, and secondary air cylinder. The secondary air enters the secondary air 20 and blows out from the secondary air hole 24.

On the other hand, the vaporized gas generated in the vaporizer l3 flows into the mixing chamber 16 from the opening 15, mixes with the vaporizing air and the primary air, becomes a premixed gas, is ejected from the flame hole 17, and is combusted. Ignition is performed by an ignition spark generated between the tip 23 of the ignition electrode section 22 and the flame hole plate 19, which is the shortest distance, and the flame hole plate 19. Further, the ignition electrode portion 22 can be placed at a position where the flame hole plate 19 is least susceptible to thermal stress due to the flame during combustion.

Effects of the Invention As described above, the combustion apparatus of the present invention provides the following effects.

Since the ignition electrode is less susceptible to the influence of the flame at the flame opening, deterioration of the ignition electrode can be reduced.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view of a combustion device according to an embodiment of the present invention, FIG. 2 is a perspective view of the vicinity of the ignition electrode of the same device, and FIG.
4 is a sectional view of the vicinity of the ignition electrode of the same device, and FIG. 5 is a perspective view of the vicinity of the ignition electrode of a conventional combustion device. 13... Carburizer, 14... Outlet, l5
...Opening, 1628...Mixing chamber, 1
8...Open end, 20. 27... Secondary air cylinder, 21... Air chamber, 22... Ignition electrode part, 23... Ignition electrode tip part, 24...
...Secondary air hole, 26...flame hole plate.

Claims (1)

[Claims] a mixing chamber having an opening facing the outlet of the vaporizer; a flame hole plate provided at the open end of the mixing chamber and divided into a plurality of pieces in the longitudinal direction and having a large number of flame holes; A secondary air cylinder provided in contact between these flame hole plates, an air chamber communicating with the secondary air cylinder and the opening, and a secondary air hole opened in the peripheral surface of the secondary air cylinder, An ignition electrode part is provided at a certain distance from the secondary air hole, and the tip of the ignition electrode part is bent and the ignition electrode part is attached to the flame hole plate at a distance shorter than the distance from the secondary air hole. A combustion device characterized by a pointed tip.