JP3451016B2 - Gas burner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high power inward flame burner.

[0002]

2. Description of the Related Art Inward flame burners having flame holes formed on the inner side surface of the burner body have been widely used in recent years, especially because of their high thermal power and small NOx generation amount.
FIG. 4 shows the structure of a conventional burner of this type, in which a plurality of slit-shaped flame holes 5 are provided in a cylindrical inner peripheral wall 3 of a horizontal ring-shaped burner main body 2, and in particular, a central blow-through space 1 In the case where the above is blocked by the shielding plate 9, excess secondary air can be blocked, so that the generation of NOx can be reduced, but the output is usually 5000 kcal / h or less.

[0003]

When attempting to increase the output of the inward flame burner, there are the following problems. Referring now to FIG. 4, if the burner combustion amount is increased by increasing the number of flame holes 5, the burner body 2
Since it is necessary to increase the diameter of the cylindrical inner peripheral wall 10, the burner becomes large. Further, if an attempt is made to increase the combustion amount by increasing the cross-sectional area of each flame hole 5, the flame hole portion is likely to overheat,
Backfire is likely to occur, and there is a problem that the root portion of the flame penetrates into the flame hole to generate noise due to oscillatory combustion. The present invention solves these problems and provides a structure of a gas burner capable of preventing the generation of backfire and noise while maintaining the features of an inward flame burner that has a high thermal power and a small amount of NOx. It is intended.

[0004]

As shown in FIG. 1, a gas burner according to the present invention has a cylindrical inner peripheral wall 3 of a horizontal ring-shaped burner body 2 having a vertical blow-through space 1 in the center thereof.
In which a plurality of cylindrical recesses 4 are formed, and a plurality of flame holes 5 are provided in the peripheral wall of the recesses 4. The recess 4 has a structure similar to that of a conventional inward flame burner and is just large. The structure is such that small inward flame burners are lined up on the inner peripheral wall of the ring burner. The flame holes 5 may be slits as shown in the drawing, or may be formed by a plurality of rows of round holes. Further, in FIG. 2, the axis of the cylindrical recess 4 is horizontal, but the flame overflows downward in the blow-through space 1 by directing it obliquely upward by an appropriate angle (0 to 60 °). Can be prevented (Claim 2). In addition, as shown in FIG. 2, a plurality of cylindrical recesses 4 are provided in a row on one side surface 7 of the rectangular cylindrical burner main body 6 whose both ends are closed, and a plurality of cylindrical recesses 4 are provided on the peripheral wall of the recesses 4. The slit-shaped or round-hole-shaped flame hole 5 is provided, and the plurality of rectangular tubular burner bodies 6 are arranged in parallel (in the case of two) with one side surface 7 facing each other, or as shown in FIG. like,
It is arranged so as to form a regular polygon (in the case of three or more polygons), and has substantially the same effect as that of FIG.

[0005]

1 shows an embodiment of a gas burner according to the present invention, in which a vertical blow-through space 1 is formed in the center of a horizontal ring-shaped burner body 2. A plurality of cylindrical recesses 4 are formed in a cylindrical inner peripheral wall 3 of the burner body 2, and a plurality of slit-shaped flame holes 5 are provided in the peripheral wall of the recess 4, and each recess 4 is formed in a conventional inner wall. It has the same structure as a facing flame burner, and has a structure in which small inward flame burners are lined up on the inner peripheral wall of a large ring burner. 8 is a mixing tube.

According to the structure of FIG. 1, the number of flame hole slits 5 can be increased without making the burner body 2 too large, as compared with the conventional inward flame burner having the same combustion amount. The capacity can be increased (for example, 10,000 kcal / h or more) without increasing the amount of combustion per flame hole, so the risk of backfire is reduced, the flame can be stabilized, and noise is generated by vibration combustion. Can be prevented.

FIG. 2 shows another embodiment of the present invention. A plurality of cylindrical recesses 4 are provided in a row on one side 7 of a rectangular tubular burner body 6 whose both ends are closed. A plurality of slit-shaped flame holes 5 are provided on the peripheral wall, and a plurality of the rectangular tubular burner main bodies 6 are arranged in parallel (in the case of two pieces) with one side surface 7 facing each other. With this configuration, as in the case of FIG. 1, it is possible to increase the output while maintaining the feature of the inward flame burner that the heat power is strong and the NOx is low. In the present embodiment, the axial center of the cylindrical concave portion 4 is configured to be directed obliquely upward by an appropriate angle toward the central axis of the burner body 2. However, in this case, as compared with the case of being horizontal, Since the flame ejected from each recess 4 toward the center can have an upward initial velocity component, it is possible to prevent the synthetic flame from overflowing downward in the blow-through space 1 between the burners 6. According to the actual measurement, when two ring-shaped burners 2 or square tubular burners 6 were faced to each other, good results were obtained in the range of 0 to 60 °.

In the embodiment shown in FIG. 3, four square tubular burners 6 are arranged in a square shape. According to this construction, four square tubular burners of 5000 kcal / h are provided. By using it, a gas burner of 20,000 kcal / h can be easily realized.

[0009]

As described above, the gas burner according to the present invention is provided with the cylindrical inner peripheral surface 3 or the surfaces 7 facing each other.
Since a plurality of conventional inward flame burners having slit-shaped flame hole groups 5 are formed on the peripheral wall of the cylindrical concave portion 4,
The total area can be increased without increasing the cross-sectional area of the individual flame holes, as compared to the conventional inward flame burner in which the size is increased by simply increasing the size of combustion, thereby increasing the total area. It prevents overheating of the cylinder to prevent backfire, stabilizes the flame, and prevents noise due to oscillatory combustion that occurs when the root of the flame enters the flame hole. Since the secondary air is not supplied into the concave portion 4 and the combustion is slowed down, there is an advantage that the burner can have high performance and NOx can be reduced as in the conventional inward flame burner.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) is a partially cutaway perspective view and (b) is a sectional view thereof.

2A and 2B show another embodiment of the present invention, in which FIG. 2A is a top view and FIG. 2B is a longitudinal sectional view thereof.

FIG. 3 is a top view showing still another embodiment of the present invention.

FIG. 4 is a partially cutaway perspective view showing a conventional example.

[Explanation of symbols]

1 void space 2 Ring burner body 3 Inner wall 4 Cylindrical recess 5 flame holes 6 square tubular burner body 7 One side (opposing side) 8 mixing tubes 9 heat shield 10 Cylindrical inner wall

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshizo Ohara 4-1-2, Hiranomachi, Chuo-ku, Osaka City Osaka Osaka Gas Co., Ltd. (72) Masao Takagi 507-2 Shinhomachi, Tokai City Toho Gas Co., Ltd. In-house (72) Inventor Masafumi Matsubara 507-2 Shinhomachi, Tokai City Toho Gas Stock Association In-house (72) Innovator Nobuo Otake 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. (56) References JP-A-60-162113 (JP, A) JP-A-52-62735 (JP, A) JP-A-9-4853 (JP, A) JP-A-63-263312 (JP, A) Practical application Sho-63-67731 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F23D 14/06 F23C 11/00

Claims (3)

(57) [Claims] 1. A plurality of cylindrical recesses are formed on a cylindrical inner peripheral wall of a horizontal ring-shaped burner main body having a vertical blow-through space at the center, and a plurality of flame holes are provided on the peripheral wall of the recess. Characteristic gas burner. 2. The gas burner according to claim 1, wherein the axis of the cylindrical recess is directed obliquely upward. 3. A plurality of cylindrical concave portions are provided in a row on one side surface of a rectangular cylindrical burner body whose both ends are closed, a plurality of flame holes are provided on a peripheral wall of the concave portions, and the plurality of rectangular cylindrical burners are provided. A gas burner, characterized in that the main body is arranged in parallel or in a regular polygonal shape with one side facing each other.