JPH10227415A - Internal flame hole type gas burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a higher combustion efficiency with the concentration of heating power by forming a number of flame holes along the circumferential surface of the inner circumferential wall of a circular part at a position lowered by a specified distance from the top surface of the circular part to build a small flame rising from the inner circumferential wall of the circular part burning a gas jetted into the inner circumferential wall from the flame holes. SOLUTION: A number of flame holes 11A are formed in three stages at a circular part 10A along the circumferential surface of the inner circumferential wall thereof 10A at a position lowered by a specified distance from the top surface thereof. A gas introduced into a gas guide part 20A is mixed with primary air, flows into the circular part 10A and is jetted out into an internal space surrounded by the inner circumferential wall from the number of flame holes 11A formed inside the inner circumferential wall of the circular part 10A. The mixed gas jetted out of the number of flame holes 11A arranged along the circumferential surface of the inner circumferential wall of the circular part 10A is gathered into the internal space surrounded by the inner circumferential wall and burned to build one small flame 1A rising from the internal space thereby enabling the concentration of heating power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas burner, and more particularly to a Bunsen burner suitable for a commercial range used in a kitchen such as a restaurant.

[0002]

2. Description of the Related Art Many commercial ranges used in Japanese and Chinese restaurants use so-called Bunsen burners. An example of the structure of a conventional Bunsen burner is shown in a schematic sectional view in FIG. 3 of the accompanying drawings. As shown in FIG. 3, the conventional Bunsen burner has an annular portion 10 having a flame hole 11.
And a gas introduction section 20 for introducing gas into the annular section 10 together with the primary air. A gas nozzle 30 connected to a gas source is connected to one end of the gas introduction unit 20, and a primary air suction hole 21 is provided so as to surround the gas nozzle 30. On the other hand, the other end of the gas introduction section 20 communicates with the inside of the annular section 10. A large number of flame holes 11 are formed at the connection between the top wall of the annular portion 10 and the outer and inner peripheral walls.

[0003] In a conventional Bunsen burner having such a structure, a gas inlet section 2 is provided from a gas outlet 30 of a gas nozzle 30 connected to an appropriate gas source such as city gas or natural gas.
When the gas is supplied into the chamber, the primary air is naturally sucked into the gas inlet 20 through the primary air suction hole 21 due to the jet flow of the gas. Thus, the gas inlet 20
The gas introduced into the inside and the primary air are mixed, flow into the inside of the annular portion 10, and are ejected from the flame holes 11 arranged along the outer periphery and the inner periphery of the top of the annular portion 10.
By igniting the mixed gas ejected from the flame hole 11 by an appropriate ignition method, for example, a piezoelectric ignition method or a continuous spark method, as shown in FIG. Is formed.

[0004]

In such a conventional Bunsen burner structure, the amount of primary air naturally sucked from the primary air suction hole 21 is 40 times less than the amount of air used for combustion.
It is only about 70%, and the remaining 60 to 30% of secondary air must be supplied from around the flame as shown by the arrow around each flame 1. For this reason, the flame 1 has a strong tendency to spread to the outside of the outer periphery of the annular portion 10, and it is difficult to concentrate the thermal power. In addition, the combustion efficiency is low and the amount of generated nitrogen oxides is large.

[0005] Since the flame tends to spread to the outside of the outer periphery of the annular portion, when this burner is used in a commercial range or the like, the burner and the top plate of the range are heated and the heat is easily transmitted to the cook. , The thermal efficiency was also worse.

Further, since the flame extends from the top surface of the annular portion, it is easily affected by the surrounding wind, and is particularly unstable against a cross wind.

An object of the present invention is to provide a gas burner which can solve the above-mentioned problems of the prior art.

[0008]

According to the present invention, there is provided a gas burner having an annular portion having a flame hole and a gas introducing portion for introducing gas together with primary air into the annular portion. At a position below the top surface of the annular portion by a predetermined distance, a large number is formed along the peripheral surface of the inner peripheral wall of the annular portion, and from the multiple flame holes to the inside of the inner peripheral wall of the annular portion. The ejected gas has a structure that can be burned as a small flame rising from the inner peripheral wall of the annular portion substantially only by the primary air.

According to a preferred embodiment of the present invention, the plurality of holes are arranged in multiple stages, or the holes have a larger hole area on an inlet side than a hole area on an outlet side.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in particular with reference to FIGS.

FIG. 1 is a schematic sectional view showing the structure of an internal flame type gas burner as one embodiment of the present invention. FIG.
As shown in the figure, the internal flame type gas burner of this embodiment has an annular portion 10A and a gas inlet for introducing gas into the annular portion 10A together with primary air, similarly to the structure of the conventional Bunsen burner described above. 20A. According to the present invention, a large number of flame holes 11A are formed in the annular portion 10A in three stages along the peripheral surface of the inner peripheral wall of the annular portion 10A at a position below the top surface by a predetermined distance. A gas nozzle 30A connected to a gas source is connected to one end of the gas introduction unit 20A, similarly to the structure of a conventional Bunsen burner, and a primary air suction hole 21A is provided so as to surround the gas nozzle 30A. Have been. On the other hand, the other end of the gas introduction part 20A communicates with the inside of the annular part 10A.

In the internal burner type gas burner of this embodiment, gas is supplied into the gas inlet 20A from the gas outlet 30A of the gas nozzle 30A connected to an appropriate gas source such as city gas or natural gas. At this time, the primary air is naturally sucked into the gas inlet 20A through the primary air suction hole 21A due to the jet flow of the gas. The gas and primary air thus introduced into the gas introduction section 20A are mixed and flow into the annular section 10A, and the annular section 1A is mixed.
A large number of flame holes 11A formed inside the inner peripheral wall of 0A blow out into the internal space surrounded by the inner peripheral wall. In this way, for the mixed gas ejected from the flame hole 11A,
By igniting by an appropriate ignition system, for example, a piezoelectric ignition system or a continuous spark system, a flame 1A is formed as schematically shown in FIG.

In such an internal flame hole type gas burner of the present invention, since a large number of small flame holes 11A are provided inside the inner peripheral wall of the annular portion 20A, the primary air suction holes 2A are provided.
Air is easily sucked in naturally through 1A. Therefore, most (70 to 100%) of the air used for combustion can be naturally sucked, and the gas blown into the inner peripheral wall of the annular portion 10A is substantially naturally sucked through the primary air suction hole 21A. Only the primary air can be burned as small flame 1A rising from the inner peripheral wall of the annular portion.

The gas mixture ejected from a large number of flame holes 11A arranged along the peripheral surface of the inner peripheral wall of the annular portion 10A is:
They are gathered in the internal space surrounded by the inner peripheral wall and burned as one small flame 1A rising from the internal space. Therefore, it is possible to concentrate the heating power and make it less likely to be affected by the surrounding wind, and in particular, it is possible to provide a stable flame that is strong against crosswinds.

As in the internal burner type gas burner of the present invention,
Burners that burn near all primary air, on the other hand, tend to produce resonances. The cause of the resonance is
It acts as a vibration surface by shortening the inner flame. Also, the primary air rate has the largest effect of the flame hole load. Even at the same burner hole end, the resistance can be reduced by increasing the area on the suction side, and the burner outlet flow velocity becomes faster. Therefore,
Even with the same primary air ratio, the internal flame can be lengthened and resonance hardly occurs. Therefore, even in the internal flame hole type gas burner of the present invention, the primary air rate is further increased by further devising the sectional shape of the flame hole formed on the inner peripheral wall of the annular portion, and the resonance sound is improved. It can be made less likely to be emitted.

FIG. 2 shows an example of the sectional shape of such a flame hole. FIG. 2A shows a flame hole 1 formed on an inner peripheral wall 10B of an annular portion of an internal flame hole type burner as another embodiment.
1B shows a cross-sectional shape, and FIG. 2B shows a cross-sectional shape of a flame hole 11C formed in an inner peripheral wall 10C of an annular portion of an internal flame hole type burner as still another embodiment.
In both embodiments, each of the flame holes 11B and 11C
The hole area on the inlet side is larger than the hole area on the outlet side. By setting the cross-sectional shape of each flame hole in this way, an effect of making it difficult for flashback to occur at the time of heat power adjustment can be obtained.

[0017]

According to the present invention, gas combustion can be performed with high efficiency, and generation of nitrogen oxides can be suppressed to a low level.

[0018] Since the high-flame flame can be heated close to the object to be heated, the thermal efficiency can be improved.

Since the flame can be reduced, the configuration around the burner can be designed to be more compact when applied to a commercial range or the like. Since less heat is applied to the gotoku and the top plate, heat is less likely to be transmitted to the cook, making cooking easier.

[0020] A stable flame that is hardly affected by the surrounding wind and is particularly strong against crosswinds can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a structure of an internal flame type gas burner as one embodiment of the present invention.

FIG. 2 is a view showing an example of a sectional shape of a flame hole formed on an inner peripheral wall of an annular portion of the internal flame gas burner of the present invention.

FIG. 3 is a schematic sectional view showing a structural example of a conventional Bunsen burner.

[Explanation of symbols]

 1A Flame 10A Annular part 11A Flame hole 20A Gas introduction part 21A Primary air suction hole 30A Gas nozzle 31A Spout

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Kamei 125 Harahata, Koike, Kashima-cho, Soma-gun, Fukushima Prefecture Inside Taniguchi Kogyo Co., Ltd. (72) Inventor Nobuo Ohtake 1-5-20 Minato-ku, Tokyo 1-5-20 Tokyo Gas Co., Ltd. (72) Inventor Toshinari Momose 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Osaka Gas Co., Ltd. (72) Inventor Toshimichi Ohara 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Inventor Masao Takagi 19-18 Sakuradacho, Atsuta-ku, Nagoya-shi, Aichi Toho Gas Co., Ltd.

Claims (3)

[Claims] 1. A gas burner comprising: an annular portion having a flame hole; and a gas introduction portion for introducing gas together with primary air into the annular portion, wherein the flame hole has a predetermined shape from a top surface of the annular portion. At a position lower by a distance, a large number are formed along the peripheral surface of the inner peripheral wall of the annular portion, and the gas ejected from the multiple flame holes into the inner peripheral wall of the annular portion is
A gas burner having a structure capable of being burned by substantially only the primary air as a small flame rising from the inner peripheral wall of the annular portion. 2. The gas burner according to claim 1, wherein the plurality of flame holes are arranged in multiple stages. 3. The gas burner according to claim 1, wherein said flame hole has a larger hole area on an inlet side than a hole area on an outlet side.