JP2743611B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a premixing type combustion device used for an oil fan heater or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a combustion device of this type is constructed by covering a top opening of a vaporizing cylinder 22 in which a sheathed heater 21 is embedded with a burner head 23 having a cantilevered shape. The mixed gas of the vaporized fuel and the combustion air supplied into the vaporization cylinder 22 is guided into the burner head 23, squirts from the flame hole 24 and the ignition flame hole 24 a, and sparks the ignition electrode 26 through the wire mesh 25. To ignite and form a flame.

[0003]

However, in the above-mentioned conventional combustion apparatus, the tip of the ignition electrode 26 is pointed to be opposed to the center of the ignition electrode 24a in order to improve the ignition performance. The heat capacity becomes small, the part becomes extremely hot during combustion, and it will be damaged if used for a long period of time.In terms of life, the ignitability will be worse, and unburned gas due to ignition delay will generate odor and CO. Occur,
There was a problem that an explosion and ignition could be caused, resulting in an extremely dangerous state.

The tip of the ignition electrode 26 is located at the ignition flame hole 2.
Since it is located at the center of the ignition electrode 4a, there is also a problem that the spark discharge varies up and down and left and right of the ignition flame hole 24a depending on the mounting position of the ignition electrode 26, and the ignition performance becomes unstable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to improve and stabilize ignition performance not only at the initial stage but also for a long period of time, and to improve the durability of an ignition electrode.

[0006]

According to the present invention, in order to solve the above-mentioned conventional problems, the tip of the ignition electrode is cut without being sharpened, and the tip of the ignition electrode is positioned above the ignition flame hole. And a wire mesh recessed in the ignition flame hole of the burner head.

[0007]

According to the present invention, the heat capacity of the tip of the ignition electrode can be ensured by the above configuration, and even if the ignition electrode is used for a long period of time, the ignition performance is not deteriorated due to the breakage of the tip, and the generation of unburned gas and CO is almost eliminated. Further, even if the mounting position of the ignition electrode varies, the spark discharge from the ignition electrode always jumps to the upper edge of the ignition flame hole, and stable ignition performance can be obtained. That is, the spark discharge is most likely to jump to each other when it has an acute angle, and according to the above-described configuration of the present invention, since the wire mesh is depressed in the ignition flame hole, the upper hole edge portion of this ignition flame hole has an acute angle portion. As a result, the spark discharge stabilizes in this part and it jumps, and the spark discharge always crosses the mixed gas that gushes from the ignition flame hole and easily diffuses upward, and stable ignition is performed .

[0008]

Embodiments of the present invention will be described below.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a bottomed cylindrical vaporizing cylinder having an open upper portion, in which a sheath heater 2 is embedded. Numeral 3 denotes an open-ended cylindrical burner head having a lower peripheral edge flange mounted on an opening edge 1a of the vaporizing cylinder 1 and screwed therein. The burner head outer 3a and the burner head inner 3b press-fitted inside thereof. It consists of. A large through-hole 4 is formed around the entire peripheral wall on the outer side 3a of the burner head.
Also, a small through-hole 5 is formed on the entire peripheral wall of b, and these through-holes are provided coaxially and set so as to face each other to form a flame hole 6. In addition, a large through hole 4a is formed outside the burner head 3a as a flame hole for ignition, and a minute through hole 5a is formed in the burner head inside 3b so as to be larger than the large through hole 4 and the minute through hole 5, respectively. An ignition flame hole 6a is formed so as to face upward. 7 is the burner head outside 3
a, and press each flame hole 6 and ignition flame hole 6
It is recessed in a.

Reference numeral 8 denotes a vaporizing cylinder lid provided in the burner head 3 and covering the opening of the vaporizing cylinder 1. The central lower opening is narrowed to a small diameter to form a mixed gas inlet 8a. Reference numeral 9 denotes a resistance plate provided over the mixed gas inlet 8a of the vaporizing cylinder lid 8, and reference numeral 10 denotes an ignition electrode for igniting the mixed gas ejected from the ignition flame hole 6a. The tip is pointed as shown in FIG. It is formed so as to be cut without cutting, and is opposed to the upper position of the ignition flame hole 6a. 11 is a flame, and 12 is a frame rod as a flame detection sensor. 13
Is a blower pipe for sending combustion air into the vaporizing cylinder 1, and an air port 14 at the tip is provided on a wall surface of the vaporizing cylinder 1, and the other is connected to a blower. Reference numeral 16 denotes a nozzle connected to an oil supply pipe 18 from a fuel pump 17, which faces the inside of the vaporization cylinder 1 through the inside of the air supply pipe 13.

In the above configuration, when the sheath heater 2 is energized and the vaporizing cylinder 1 is heated to a predetermined temperature, the blower is started and combustion air is supplied from the air port 14 through the ventilation pipe 13 into the vaporizing cylinder 1. The fuel is also sent, and the fuel pump 17 is also started, so that fuel is ejected from the nozzle 16 into the interior of the vaporization cylinder 1 through the oil feed pipe 18. The liquid fuel injected into the vaporizing cylinder 1 is vaporized on the side wall surface of the heated vaporizing cylinder 1, mixed with combustion air, sent to the burner head 3, and ejected from the flame holes 6, 6a. This mixed gas is ignited by spark discharge from the ignition electrode 10 to form a flame 11.

Since the tip of the ignition electrode 10 has a cut shape and is not sharp, a sufficient heat capacity can be secured, and the temperature of the ignition electrode 10 does not become high enough to cause damage even when exposed to a flame during combustion. . Therefore, even if the fuel cell is used for a long time, the positional relationship with the ignition flame hole 6a does not change, the initial ignition performance can be maintained, and the generation of unburned gas and CD can be suppressed.

On the other hand, the ignition electrode 10 has a shape in which the tip end is cut, and stable ignition performance can be obtained even if its mounting position varies. That is, in general, spark discharges are most likely to jump to each other at an acute angle, but the tip of the ignition electrode 10 is located above the ignition flame hole 6a as shown in FIG. The wire mesh 7 having the hole 6a is
a of the electrode tip and the upper edge 1 of the ignition flame hole 6a.
0a and the upper hole edge 6a 'become the closest acute angle portion. Therefore, the spark discharge stably blows to the upper end edge 10a and the upper hole edge 6a, and always crosses the mixed gas which is ejected from the ignition flame hole 6a and is easily diffused upward, so that stable ignition is obtained. Will be done.

Since the discharge position of the ignition electrode 10 has a small variation as described above, the ignition flame 6a is replaced with the other flame flame 6
It is not necessary to make the spark discharge always jump into the ignition flame hole as much larger than that, so that the suppression of the lifting of the flame at the time of strong combustion and the rise of the wire mesh temperature at the time of weak combustion caused by doing so Thus, it is possible to provide a burner which can obtain a good combustion state without combustion noise due to lifting and which has a high durability of a wire mesh.

[0015]

As described above, the combustion apparatus of the present invention can suppress the generation of unburned gas, CO and the like not only at the initial stage but also for a long period of time and can obtain stable ignition performance. A high-performance combustion device that can also improve durability can be provided.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the entire combustion device.

FIG. 3 is an enlarged sectional view of a main part of a conventional combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vaporization cylinder 3 Burner head 6a Ignition flame hole 7 Wire net 10 Ignition electrode

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F23Q 3/00 610 F23Q 3/00 610A

Claims (1)

(57) [Claims] 1. A vaporizing cylinder having an opening, a burner head covering an opening of the vaporizing cylinder and having an ignition flame hole for ignition at an appropriate position on a peripheral wall, a wire mesh mounted on an outer periphery of the burner head, and An ignition electrode for igniting the mixed gas ejected from the ignition flame, wherein the ignition electrode has a shape in which the tip is cut without being sharpened, and the tip is provided at a position relatively above the ignition flame. A combustion device wherein the wire mesh is recessed in an ignition flame hole.