JPH02275206A - Burner - Google Patents

Abstract

PURPOSE:To shorten the fire spread time and hence prevent the discharge of vaporized gas by providing a secondary air hole which is open to the upper end of a secondary air chamber except for a fire spread section. CONSTITUTION:The air sent from a combustion fan 20 is divided into three systems which comprise a vaporizer air which enters a mixing chamber 15 passing through a vaporizer 11, a primary air which enters the mixing chamber 15 passing through a primary flow straightening hole 13, and a secondary air which is ejected from a secondary air hole 18. The vaporized gas generated in the vaporizer 11 is mixed with the vaporizer air in the mixing chamber 15, and produces a premixed air, which is ejected from flame holes 16. The premixed air ejected from a flame hole 16A is ignited by the discharge of an ignition plug 21, thereby forming flames. As a fire spread section 19 is surrounded by the flame holes 16 and the secondary air holes 18, a stagnation area 22 is generated. The premixed air and the secondary air flow into this stagnation area 22. Therefore, the first ignited flames are brought into contact with the adjoining premixed air in a fire spread section, thereby igniting the premixed air instantaneously. Since then similar fire spread continues, which makes it possible to shorten fire spread time and prevent the discharge of exhaust gas as well.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to shortening the flame transfer time in a vaporization type combustion apparatus.

2. Description of the Related Art As shown in FIG. 3, a conventional combustion device of this type is provided with a mixing chamber 5 on the outlet 2 side of a carburetor 1 that communicates with an air chamber 4 through a primary rectifying hole 3. .

A plurality of porous flame holes 6 were provided on the downstream side of the mixing chamber 5 and divided into a plurality of pieces in the longitudinal direction, and a secondary air chamber 7 was provided between the flame holes 6 and communicated with the air chamber 4. .

A secondary air hole 8 was opened at the upper end of the secondary air chamber 7.

The combustion fan 9 was in communication with the air chamber 4.

The ignition plug 10 was provided downstream of the flame hole 6A.

In the above configuration, the vaporized gas generated in the vaporizer 1 is ejected from the outlet 2 and flows into the mixing chamber 7. The primary air sent from the combustion fan 9 and passed through the primary straightening hole 3 flows into the mixing chamber 7, mixes with the vaporized gas, and becomes a -C premixture. This premixture was ejected from the flame hole 6, and combustion was started by the ignition plug lO.

Furthermore, the secondary air sent from the combustion fan 9 and blown out from the secondary air hole 8 promoted the previous combustion.

Problems to be Solved by the Invention However, in the above configuration, the premixed air ejected from the flame hole 6A is ignited by the ignition plug 10 to form a flame, but a jet of secondary air is generated between each premixed gas. Because of this, it takes time for the ignition to take place, resulting in the problem that vaporized gas is discharged until all of the premixture is ignited.

The present invention is intended to solve such conventional problems, and aims to shorten the heat transfer time and prevent the emission of vaporized gas.

Means for Solving the Problems In order to solve the above problems, the combustion device of the present invention includes a mixing chamber provided on the downstream side of the carburetor, and a plurality of chambers divided in the downstream side of this mixing chamber in the longitudinal direction. A combustion device comprising a flame hole provided in the flame hole, a secondary air chamber provided between the flame holes, and a secondary air hole opened at the upper end of the secondary air chamber except for the flame transfer part.

Operation According to the above-described structure, the flame formed by igniting the premixture by the spark plug contacts the adjacent premixture at the flame transfer portion, and instantaneously ignites the premixture. Since the same process of transferring the heat is continued thereafter, the time required for transferring the heat can be shortened.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

1 and 2, reference numeral 11 denotes a vaporizer, and a mixing chamber 15 is provided on the outlet 12 side of the vaporizer, which communicates with an air chamber 14 through a primary rectifying hole 13. Reference numeral 16 indicates a porous flame hole located downstream of the mixing chamber 15 and in the longitudinal direction. j! The secondary air chamber 17 communicates with the air chamber 14 and is provided between the flame holes 16. Reference numeral 18 denotes a secondary air hole, which is opened at the upper end of the secondary air chamber 17 except for the fire transfer portion 19 in the center. 20 is a combustion fan, which is communicated with the air chamber 14. Reference numeral 21 denotes a spark plug, which is provided on the downstream side of the porous hole 16A.

In the above configuration, the air sent from the combustion fan 20 passes through the vaporizer Il and enters the mixing chamber 15, the vaporizing air 1
The air is divided into three systems: primary air that passes through the secondary air chamber 13 and enters the mixing chamber 15, and secondary air that passes through the secondary air chamber 17 and blows out from the secondary air hole 18. On the other hand, the vaporized gas generated in the vaporizer 11 is mixed with vaporizing air and primary air in the mixing chamber 15 to form a premixed gas, which is ejected from the flame hole 16. At this time, the premixed mixture ejected from the flame hole 16A is ignited by the discharge of the spark plug 21, forming a flame.

Since the fire transfer part 19 is surrounded by the flame hole 16 and the secondary air hole 18, a stagnation area 22 occurs, and this stagnation area 22
The premixture and secondary air flow into the air. Therefore, the previously ignited flame comes into contact with the adjacent premixture at the flame transition portion and instantaneously ignites this premixture.

Since the same fire transfer is continued thereafter, the fire transfer time can be shortened.
This has the effect of preventing exhaust gas emissions. Further, the stagnation region 22 has the effect of improving the flame stability of the flame formed in the flame hole 16.

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

(1) Since the secondary air hole is opened at the upper end of the secondary air chamber except for the flame transfer part, it is possible to shorten the flame transfer time and improve flame stability.

(2) Because there is a jet of secondary air between the premixed gases,
Combustion characteristics are improved and noise can be reduced.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway enlarged sectional view of a combustion device according to an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view, and FIG. 3 is a partially cutaway perspective view of a conventional combustion device. 11... Carburizer, 14... Air chamber, 1
5...Mixing chamber, 16...Flame hole, 17.
...Secondary air chamber, 18...Secondary air hole,
I9... Fire transfer department. Name of agent Patent attorney Shigetaka Awano and 1 other person 16--~ 17-・ +9--- 1ji Iken air chamber mixture Muroen-kou 2 double 9 type Murohi Ishiri Self-B Houki 2 Zuyo = 15 −−・ 16 −・− T'7−−・ノ8−−− Air Chamber Mixed Palace Room Immortality 2 Air Chamber 2 Bu Reiki Kōten Usiri Kōten

Claims (1)

[Claims] A mixing chamber provided on the downstream side of the vaporizer in communication with the air chamber, a plurality of flame holes provided on the downstream side of the mixing chamber and divided into a plurality of flame holes in the longitudinal direction, and communication with the air chamber. A combustion device comprising: a secondary air chamber provided between the flame holes; and a secondary air hole opened at the upper end of the secondary air chamber except for the flame transfer part.