JPS6235008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas burner, and particularly to a large-capacity forced draft gas burner with a large combustion load.

This type of gas burner has a combustion tube and a fuel injection nozzle inside the tip of a draft tube that communicates with the blast pipe, and is equipped with an ignition plug, a flame monitoring probe, and the like.

Hereinafter, details of the present invention will be explained in comparison with a conventional product with reference to the drawings.

FIG. 1 is a main sectional view showing an example of a conventionally known gas burner, FIG. 2 is a main sectional view showing an embodiment of the gas burner according to the present invention, FIG. 3 is a front view thereof, and FIGS. FIG. 5 is a partial sectional view showing another embodiment.

In FIG. 1, 1 is a draft tube, 2 is an air supply pipe connected to a blower (not shown),
3 is a combustion tube consisting of a side wall portion 3a and a back plate 3b; 4;
1 is a nozzle having gas injection holes 4a, 5 is a gas supply pipe, 6 is a spark plug, and 7 is a flame.

Needless to say, in this burner, the gas supply pipe 5
The gas supplied from the injection hole 4a of the nozzle 4,
4a into the combustion tube 3, where it is supplied via the air supply pipe 2 and draft tube 1, and introduced through the numerous air holes 3c, 3c provided in the side wall 3a of the combustion tube 3. mixed with air,
It is ignited by a spark plug 6 and combusts, and a flame 7 is emitted in front of the burner.

However, in such a configuration, the space S at the back of the combustion tube 3
Gas remains at a high concentration in these areas, and this often causes not only lift, misfires, and incomplete combustion, but also the generation of intense combustion noise.

The present invention has been made based on the above-mentioned viewpoints, and an object of the present invention is to prevent lift and misfire even if the combustion load fluctuates significantly.
Another object of the present invention is to provide a gas burner that produces low combustion noise and can completely burn gas at all times.

The gist of the present invention is that a nozzle is provided with two rows of gas injection holes, front and rear, and the front row injection holes have a large inner diameter and are bored diagonally forward, thereby directing a large amount of gas diagonally forward. The rear injection hole has a small inner diameter and is bored to the side or diagonally backward, thereby injecting a small amount of gas laterally or diagonally backward, Further, an air hole is provided in the combustion tube at a portion corresponding to the rear injection hole, so that the gas injected from the rear injection hole is combusted in the innermost part of the combustion tube to form an auxiliary flame.

In FIGS. 2 and 3, 7 is a draft tube, 8 is an air supply pipe, 9 is a combustion tube consisting of a side wall 9a and a back plate 9b, 10 is a nozzle, 11 is a gas supply pipe, and 12 is a spark plug. , 13 is a flame detector, 1
4 and 14 are main flames, and 15 and 15 are auxiliary flames.

In this embodiment, the nozzle 10 is shaped like a bottle, that is, a cylindrical bottle with a truncated conical tip. gas injection holes 10a, 10a,
Narrow opening gas injection hole 10 for flame reinforcement that opens diagonally backward
6 b and 10b are provided. This nozzle 10 is attached to the tip of a gas supply pipe 11 via a threaded joint provided at its end.

The side wall 9a of the combustion tube 9 has an air hole 9 for the main flame.
In addition, six air holes 9d and 9d for auxiliary flame are provided on the back plate 9b.
Although omitted here for the sake of simplicity, the combustion tube 9 is actually attached coaxially to the draft tube 7 using a suitable bracket.

In the burner according to the present invention, the gas supplied from the main flame gas injection holes 10a, 10a flows through the air holes 9.
The main flames 14, 14 are formed by mixing with the air supplied from c, 9c, and the main flames 14, 14 are formed, and at the same time, a small amount of gas supplied from the auxiliary flame gas injection holes 10b, 10b is mixed with the air supplied from the air holes 9d, 9d. Since it mixes with the supplied air and burns, auxiliary flames 15, 15 are always formed in the innermost part of the combustion tube 9, so that high concentration gas does not stay inside the combustion tube 9, and flame lift etc. This prevents combustion and reduces combustion noise.

When assembling the burner of the present invention, as shown in FIGS. 2 and 3, the gas injection holes 10a, 10a for the main flame, the air holes 9c, 9c, and the gas injection holes for the auxiliary flame are holes 10b, 10b and air hole 9d,
It is recommended that the air holes 9d are arranged alternately in the circumferential direction, and the air holes 9c,
It is recommended that the hole 9c be a long hole extending in the generatrix direction of the side wall portion 9a. Further, the air holes 9d and 9d may also be elongated holes that are long in the radial direction.

With this configuration, the air blown into the combustion chamber can reach the center of the combustion chamber in layers or bands without colliding with the fuel gas jet, dramatically increasing the contact area with the gas. This will increase fuel efficiency, promote mixing, make combustion safer and more complete, and reduce combustion noise.

Using these elongated air holes 9c, 9c not only reduces combustion noise and stabilizes the flame, but also has great effects compared to using circular holes in a row as air holes. Distribution resistance can be reduced,
Furthermore, since the combustion tube can be shortened, the burner can be made smaller and lighter.

Next, FIGS. 4 and 5 will be explained. These mainly indicate other shapes of the nozzle.

In the embodiment shown in FIG. 4, the combustion tube 16 consists of a cylindrical side wall 16a and a side plate 16b, the former having elongated holes 16c, 16c, and the latter having a circular hole 16.
There are four each of d and 16d.
In this case, the nozzle 17 has a hemispherical shell-shaped end, in which the main flame gas injection holes 17a, 17a are provided, and the auxiliary flame gas injection holes 17b, 17b are perpendicular to the cylindrical side wall. It is drilled in. Furthermore, as shown in FIG. 4, it is also possible to provide a gap 16e between the nozzle 17 and the through hole through which it passes, and use this gap as an air hole for auxiliary flame.

The nozzle 18 shown in FIG. 5 is constructed by welding two semi-elliptic shells 19 and 20. The former is provided with a threaded joint 19a and four flame auxiliary gas injection holes 19b, 19b, and the latter is provided with 8
Main flame gas injection holes 20a, 20a and a hexagonal hole 20b for a spanner are provided.

Since the present invention is configured as described above, it is possible to provide a gas burner that is compact, consumes little power, and ensures quiet, stable, and complete combustion.

The configuration of the present invention is not limited to the embodiments described above, and the shape of each part, especially the shape of the combustion tube and nozzle, the number and shape of the gas injection holes and air holes, etc. are within the scope of the purpose of the present invention. The design can be changed freely, for example, the gas injection holes can be made into slits instead of circular holes, and the air holes can also be formed in a spiral shape in the side wall. It is also possible to create a swirling flow in the combustion chamber by providing a guide vane such as the one shown in FIG. .

[Brief explanation of the drawing]

FIG. 1 is a main sectional view showing an example of a conventionally known gas burner, FIG. 2 is a main sectional view showing an embodiment of the gas burner according to the present invention, FIG. 3 is a front view thereof, and FIGS. FIG. 5 is a partial sectional view showing another embodiment. 1, 7... Draft tube, 2, 8... Air supply pipe, 3, 9, 16... Combustion tube, 3a, 9a, 16a
...Side wall part, 3b, 9b, 16b...Back plate, 3c...Air hole, 9c, 16a...Air hole for main flame, 9d, 16
b... Air hole for auxiliary flame, 4, 10, 17, 18... Nozzle, 4a... Gas injection hole, 10a, 17a, 20a
...Main flame gas injection holes, 10b, 17b, 19b...
Flame auxiliary gas injection hole, 5, 11... gas supply pipe, 6,
12... Spark plug, 7... Flame, 13... Flame detector, 1
4...Main flame, 15...Auxiliary flame.

Claims (1)

[Claims] 1. A draft tube connected to an air blower, provided in the draft tube, having an opening for flame radiation in the front, a rear end closed by a back plate, and a side wall for air flow. A combustion tube provided with a hole, a nozzle capable of injecting fuel gas into the combustion tube, a gas supply pipe communicating with the nozzle, and an ignition plug having at least one end inserted into the combustion tube. In a gas burner, the nozzle has a main flame gas injection hole that injects most of the fuel gas diagonally forward, and an auxiliary flame gas injection hole that injects a portion of the fuel gas diagonally backwards or sideways. The combustion tube is characterized by having a plurality of air holes for the main flame provided in the side wall of the combustion tube, as well as air holes for the auxiliary flame in the back plate of the combustion tube. and the above gas burner. 2. The gas burner according to claim 1, wherein the main flame gas injection holes and the main flame air holes provided in the side wall of the combustion cylinder are provided alternately in the circumferential direction. 3. The gas burner according to claim 1 or 2, wherein the gas injection holes for auxiliary flames and the air holes for auxiliary flames provided in the back plate of the combustion cylinder are provided alternately in the circumferential direction. 4. The main flame air hole provided in the side wall of the combustion cylinder is a long hole elongated in the generatrix direction of the side wall of the combustion cylinder, according to any one of claims 1, 2, or 3. gas burner.