JPH0318814Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a combustion device that includes a plurality of burners (for example, rod-shaped burners) substantially parallel to each other.

[Prior art]

As shown in FIG. 4, a conventional combustion device of this type has a plurality of burners 2,
2,... are installed substantially parallel to each other, and a part of the combustion air is drawn into the mixing pipe 21 as primary air by the ejector effect of the fuel jetted out from the nozzle 41 of the fuel pipe 4, and the flame of the burner 2 is used as an air-fuel mixture. From the hole to the combustion chamber 12
and forms flame F. Further, the secondary air passes through the secondary air passage 5 between the burners 2 and is injected and supplied toward the flame F.

[Problems with conventional technology]

However, in such a conventional combustion apparatus, the air-fuel mixture flows upward from the flame hole of the burner 2, and the secondary air flows upward through the slit 5, so that the flows flow parallel to each other. Here, since the combustion flame is dominated by the natural diffusion of secondary air, the flame F extends upward, resulting in the disadvantage that the height of the combustion chamber 12 has to be increased.

[Means for solving problems]

This invention was devised to eliminate the above-mentioned inconvenience, and its gist is to provide a plurality of rod-shaped burners with a required number of flame holes, and to connect these burners approximately in parallel via a secondary air supply slit. In the combustion device, a flow changing plate is inserted and fixed in a substantially central part in the width direction of each of the slits, and these flow changing plates are arranged in parallel with the longitudinal direction of the rod-shaped burner. A required number of slanted pieces extending upward toward the tip are arranged at the upper end of the changing plate alternately in opposite directions along the longitudinal direction of the flow changing plate, and these slanted pieces are extended above the burner port. The combustion apparatus is characterized in that the inclined pieces are arranged in parallel with each other in the plurality of flow changing plates.

[Effect of invention]

Since the combustion apparatus according to this invention is constructed as described above, the secondary air flowing upward from the slit flows obliquely upward above the flame port along the lower surface of the inclined plate. Here, since the inclined pieces are arranged alternately in opposite directions along the longitudinal direction of the flow changing plate, the secondary air is divided and flowing alternately along the longitudinal direction of the flow changing plate, and as a result, the flame is The flow changing plates are divided alternately along the longitudinal direction.

[Description of Examples]

Hereinafter, embodiments of this invention will be described based on the drawings.

In Fig. 1, 1 is a burner case, 2, 2,
... is a burner made of sheet metal, and is installed at the bottom of the burner case 1. These burners 2, 2, . . . divide the burner case 1 into an air chamber 11 and a combustion chamber 12. 4 is a fuel pipe, which is installed in the air chamber 11. This fuel pipe 4 has nozzles 41, 4
1, . . . and eject raw gas toward the mixing tube 21 of the burner 2 from these nozzles 41, 41, . At this time, a part of the combustion air (primary air) in the air chamber 11 is sucked into the mixing pipe 21 by the ejector effect. Note that the air-fuel mixture in the mixing tube 21 flows out from the flame hole 22 (see FIG. 2) of the burner 2 and becomes the flame F. 5, 5, . . . are secondary air passage slits, which are formed between the burners 2. The combustion air in the air chamber 11 passes through the slits 5, 5, . . . and is injected and supplied to the flame F in the combustion chamber 12 as secondary air.

Note that 6 is a heat exchanger and 13 is an exhaust port.

Further, the combustion air in the air chamber 11 is forcibly supplied through the opening 14 of the burner case 1 by a fan or the like.

Next, the vicinity of the burner 2 will be described in detail based on FIGS. 2 and 3.

In the figure, 23, 23, . . . are convex portions formed on the side surfaces of the burners 2, 2, .
Reference numerals 7, 7, . . . designate flow changing plates, which are inserted into the intermediate portions of the secondary air slits 5, 5, . This flow changing plate 7 guides the flow of secondary air injected into the flame F. 71, 71, . . . are inclined plates, which are formed on the upper part of the flow changing plate 7 so as to be bent alternately in opposite directions. This inclined plate 7
1, 71,... are flame holes (burner) 22, 22,...
It extends above the air and creates a meandering flow of secondary air. Therefore, the flame F has a zigzag shape as shown by the imaginary line in FIG. 4, and the flame surface area per unit area in the burner 2 is improved.

FIG. 4 shows another embodiment, in which flame holes 22, 22,
...It is rectangular in shape.

[Effect of idea]

The combustion device according to this invention is equipped with a plurality of rod-shaped burners having a required number of flame ports, and these burners are installed approximately in parallel via secondary air supply slits, and each of the slits has approximately the same width in the width direction. In a combustion device in which flow changing plates are inserted and fixed in the central part and these flow changing plates are arranged in parallel with the longitudinal direction of the rod-shaped burner, the flow changing plates are arranged at the upper end of the rod-shaped burner in an upward direction toward the tip. A required number of extending inclined pieces are arranged alternately in opposite directions along the longitudinal direction of the flow changing plate, and the inclined pieces extend above the flame port, and in the plurality of flow changing plates, Since the inclined pieces are arranged in parallel with each other, the secondary air flowing upward from the slit flows diagonally upward above the burner port along the lower surface of the inclined plate. Here, since the inclined pieces are alternately arranged in opposite directions along the longitudinal direction of the flow changing plate, the secondary air is divided and flowing alternately along the longitudinal direction of the flow changing plate, and as a result, flames are also generated. As a result of the flow changing plates being divided alternately along the longitudinal direction, the surface area of the flame can be larger than that of the conventional method. In particular, since the inclined pieces are arranged in parallel with each other in the plurality of flow changing plates,
The flames separated between the rod-shaped burners do not overlap, and from this point as well, the surface area of the flame can be made larger than in the past.

In addition, in the combustion device according to this invention, since secondary air flows along the inside of the inclined piece, an air curtain is formed between the flame and the inclined plate, and as a result, the inclined plate is hardly heated. As a result, the durability of the inclined plate is improved.

Furthermore, in the combustion device according to this invention, the secondary air flows along the inside of the inclined piece and above the flame opening, so the flame and secondary air merge smoothly, resulting in less combustion noise. It is unlikely to occur.

[Brief explanation of drawings]

The drawings show an embodiment of the combustion apparatus according to the invention, and FIG. 1 is a longitudinal sectional view, FIG. 2 is an enlarged view of a portion in FIG. 1, and FIG. FIG. 4 is a diagram of another embodiment corresponding to FIG. 3, and FIG. 5 is a diagram of a conventional example. 2... Sheet metal burner (burner), 22... Flame hole,
5... Secondary air supply slit, 7... Flow change plate, 71... Inclined piece.

Claims (1)

[Claims for Utility Model Registration] A plurality of rod-shaped burners with a required number of flame holes are provided, and these burners are installed approximately in parallel via secondary air supply slits, and each of the slits has approximately the same width in the width direction. In a combustion device in which flow changing plates are respectively inserted and fixed in the central part and these flow changing plates are arranged in parallel with the longitudinal direction of the rod-shaped burner, the flow changing plates are arranged at the upper end of the rod-shaped burner in an upward direction toward the tip. A required number of extending inclined pieces are arranged alternately in opposite directions along the longitudinal direction of the flow changing plate, and the inclined pieces extend above the flame port, and in the plurality of flow changing plates, A fuel device characterized in that inclined pieces are arranged in parallel with each other.