JPH01302010A - High load combustion device - Google Patents

Abstract

PURPOSE:To reduce a noise and improve a performance of combustion by a method wherein some flame holding air holes are made in horizontal plates, several main air holes are opened in inclined surfaces in a continuous mountain-shape, opening areas at main air holes at valleys are made large and the opening areas of the main air holes at the mountain sides are made small. CONSTITUTION:Almost of all combustion air reach an air chamber 9 and are supplied from main air holes 12' toward a flame. An air injection plate 1 is formed with continuously slant surfaces 2, vertical surfaces 3 and horizontal surfaces 4. The slant surfaces 2 have several main air holes 12' opened in a continuous mountain form. Opening area of the main air openings 12' at the valleys is made large and opening area of the main air openings at the mountain-side is made small. Thus, it is possible to prevent an occurrence of noise caused by a disturbed flame due to a lack of air at the upstream side requiring a large amount of air without being influenced by a shape or a volume of the air chamber 9. It is further possible to reduce a noise and improve a poor combustion characteristic caused by a gradual reaction and at the same time a dividing of the flame may positively performed and a stable high load combustion can be carried out. An amount of air can be restricted against the downstream side of the flame where an excessive amount of air is found. In addition, a cooling of the flame at the downstream side is reduced and at the same time almost of all the air are utilized form combustion, resulting in that no occurrence of CO is found.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates primarily to household combustors, and in particular, uses a fan to forcibly supply combustion air to a flame to achieve a shorter flame and downsize. This relates to a high-load combustion device designed to reduce noise.

2. Description of the Related Art Conventionally, in this type of high-load combustion apparatus, as shown in FIGS. 4 and 5, an air injection plate 1 is bent and has an inclined surface 2, a vertical surface 3, and a horizontal surface 4, and the vertical surface 3 has a small The flame holding chamber 6 is in contact with the protrusion 5.
A small gap 8 was formed between the flame holding plate 7 and the flame holding plate 7 composing the flame holding plate 7 .

A part of the combustion air supplied to the air chamber 9 passes through the small gap 8 to the flame stabilizing chamber 6, flows out from the flame stabilizing air port 10 to the combustion chamber 11 at low speed, stabilizes the flame, and completes most of the combustion. The air for use was blown out at high speed from the short flame air port 12 into the combustion chamber 11, reacted with the flame, and achieved a short flame.

In the above configuration, as shown in FIG. 6, the short flame air ports 12 provided on the inclined surface 2 of the air injection plate 1 are uniformly designed. Therefore, the air ejection amount distribution was affected by the shape and volume of the air chamber 9, and did not satisfy the optimum reaction conditions with the air-fuel mixture.

Problems to be Solved by the Invention Therefore, the distribution of the amount of air ejected from the short flame and other air ports 12 tends to be larger in the downstream area and less in the upstream area, as shown by the arrows in FIG. 5. In the downstream area, there will be too much air and combustion will occur.

Therefore, in the upstream region, the lack of air promotes flame turbulence and slow reaction, resulting in poor combustibility, while in the downstream region, the excess air causes flame cooling and air bypass, making it difficult to improve the flammability limit. It had the characteristic of high noise level.

The present invention solves the above-mentioned disadvantages and provides a configuration that can improve combustion performance with low noise.

Means for Solving the Problems Therefore, in the present invention, the air jet plates are arranged in a continuous manner in a horizontal plane, a vertical plane, and an inclined plane on substantially the same plane as the burner outlet surface of the burner outlet in the longitudinal direction on both sides of the burner outlet. It is bent to form a part of the air chamber, with air ports for flame stabilization on the horizontal surface, and a number of main air ports opened in a continuous mountain shape on the slope, and the opening area of the main air ports on the valley side. The opening area of the main air port on the mountain side is small.

Effect: With the above configuration, the amount of air emitted from the main air port on the slope can be regulated by the opening area on the mountain side and the opening area on the valley side, and can be set reliably.

Therefore, the optimum air supply conditions for the air-fuel mixture can be achieved with high accuracy without being affected by the shape or volume of the air chamber.

EXAMPLE Hereinafter, an example in which the present invention is applied to a water heater will be described based on FIGS. 1 to 3.

1 to 3, a fan 14 and a fuel supply pipe 15 are attached to the bottom of the main body 13. A plurality of burners 16 are provided on the downstream side of the fuel supply pipe 15, and an air injection plate 1 is fitted between the burners 16, with an air chamber 9 on the upstream side and a combustion chamber 11 on the downstream side. . A burner port 18 consisting of a large number of burner ports 17 is formed on the downstream side of the burner 16 . The air injection plate 1 has an inclined surface 2, a vertical surface 3, and a horizontal surface 4 formed continuously, and the inclined surface 2 is provided with a main air port 12' in the shape of a continuous mountain, and the main air port 12' on the mountain side is The hole diameter d1 is set so that the opening area is small, and the hole diameter d2 is set so that the opening area of the main air port 12° on the valley side is large. It is shown as dl>d2 in FIG. This opening means is the same in Srisotro. A large number of flame-holding air ports 10 are provided in a straight line on the horizontal surface 4. The air chamber 9 is provided with a flame holding plate 7 that forms a large number of small protrusions 8, and one side is joined to the small protrusions 9 at the vertical surface 3 to form a small gap 8, and a flame holding plate 7 communicating with the air chamber 9 is provided. constitutes chamber 6, and
The other end of the flame stabilizing chamber 6 is joined to the air jet plate 1 so as to communicate with the flame stabilizing air port 10. A heat exchanger 20 is provided downstream of the combustion chamber 11.

In the above configuration, a part of the fuel air supplied from the fan 14 enters the burner 16 together with the fuel supplied from the fuel supply pipe 1S, becomes an air-fuel mixture, and enters the combustion chamber from the flame port 17.
1 and forms a flame. Most of the fuel air reaches the air chamber 9 and is supplied to the flame at a relatively high speed through the main air port 12'. At this time, since the main air port 12' is provided in the shape of a continuous mountain, the flame is formed along this.
A large amount of air from the main air port 12' having a large opening area on the valley side sufficiently splits the flame, significantly promoting the reaction and shortening the flame. Furthermore, the amount of air is regulated at the main air port 12', which has a small opening area on the mountain side, thereby preventing flame cooling and reducing the amount of combustion air bypassed.

On the other hand, part of the fuel air supplied to the air chamber 9 is absorbed into the small gap 8.
While passing through the flame stabilizing air port 10, the pressure is reduced and the flame stabilizes the flame base. The combusted high-temperature gas reaches the heat exchanger 2°, heats water, and then becomes low-temperature exhaust gas and is released into the atmosphere.

Here, a large number of main air ports 12' on the slope are opened in a continuous mountain shape, with the main air ports 12' on the valley side having a large opening area and the main air ports on the mountain side having a small opening area. Because of this, it is possible to supply enough air to the flames in the upstream area, which requires a large amount of air, regardless of the shape and volume of the air chamber 9, and also to the downstream area, where excessive air volume is a problem. The configuration allows the amount of air to be regulated, and the optimal air supply conditions for the flame can be achieved.

Effects of the Invention As described above, the high-load combustion apparatus of the present invention provides the following effects.

(1) The main air vent on the valley side is designed to have a large opening area, so it can supply sufficient air regardless of the shape or volume of the air chamber, which prevents air shortages in the upstream area. It prevents noise generation due to flame turbulence, reduces noise, improves poor combustibility caused by slow reaction, and ensures flame division, achieving stable high-load combustion.

(2) Since the opening area of the main air port on the mountain side is set small, the air volume is not affected by the shape or volume of the air chamber, and can also be used for the downstream side of the flame where excessive air volume is a problem. can be freely regulated, flame cooling from excessive air downstream of the flame is reduced, most of the air is used for combustion, and the amount of air bypass is significantly reduced, eliminating the generation of Co and reaching the flammability limit. can be improved.

(3) Since the influence of the air chamber volume on the ejection amount distribution can be eliminated, the air chamber can be made more compact and the high-load combustion device can be downsized.

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view of a high-load combustion device according to an embodiment of the present invention, FIG. 2 is a partially sectional perspective view showing the main parts of the device, FIG. 3 is an enlarged partial sectional view of the device, and FIG. The figure is a partial cross-sectional perspective view showing the main parts of the conventional example, and FIG. 5 is a partial cross-sectional enlarged view of the conventional example. DESCRIPTION OF SYMBOLS 1... Air injection plate, 2... Inclined surface, 3... Vertical surface, 4... Horizontal surface, 9... Air chamber, 10
... Flame holding air port, 12゛... Main air port, 17...
Flame mouth, 18 - Flame mouth part. Name of agent: Patent attorney Toshio Nakao and 1 other person! −
・・Air pressure sales 6−・−Horoden 7, − Air chamber + I − Daminato chamber Figure 1 0 Haiki 1 −1 Sky R'* e +t2・−I around M toilet mouth 3− Drop Is there a plane on face 4/-7? - Hall Ki Presentation 10 - Deep Flame Air Port I2' - Main Hall Rokgo 17 - Flame Mouth Jll - One Flame Mouth Part 2 Figure 1 - Aether Spray Plate 2 - * Kamen 3 - g a City 4. -Ice plane 12--Main air port Fig. 3 1...-Air jet IFt plate r2--- gl! ! Window opening 44 Figure 5FZI

Claims (1)

[Claims] The air jet plate is bent in the longitudinal direction on both sides of the flame spout so as to continuously form a horizontal plane, a vertical plane, and an inclined plane on substantially the same plane as the face of the flame mouth of the flame spout, so that a part of the air chamber is formed. The horizontal surface is provided with air ports for flame stabilization, and the slope surface is provided with a large number of main air ports in a continuous mountain shape, with the main air ports on the valley side having a large opening area, and the main air ports on the mountain side having a large opening area. A high-load combustion device with a small opening area.