JPH0221113A - High load-burner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention mainly relates to household combustion devices, and in particular, uses a fan to forcibly supply combustion air to a flame to realize a short flame and miniaturize the device. This relates to a high-load combustion device designed to reduce noise.

2. Description of the Related Art Hitherto, as a high-load combustion device of this type, one constructed as shown in FIGS. 3
A small protrusion 7 of a flame holding plate 6 that forms a flame holding chamber 5 is in contact with the vertical surface 3, and a small protrusion 7 is formed between the vertical face 3 and the flame holding plate 6. A gap 8 was formed. Part of the combustion air supplied to air chamber 9 is used in booth 11j! 8 and reaches the flame stabilizing chamber 5, flows out at a low speed from the flame stabilizing air port 10 formed in the horizontal surface 4 into the combustion chamber 11 to stabilize the flame,
Most of the combustion air was blown out from the main air port 12 of the inclined surface 2 into the combustion chamber 11 at high speed, reacted with the flame, and achieved a short flame. Reference numeral 13 denotes a burner port having a burner port 14, and the horizontal surface 4 is located at approximately the same level as the burner port 14.

Problems to be Solved by the Invention Although the device with the above configuration aims to reduce noise during high-load combustion, as shown in FIG. The air-fuel mixture flow rate at the end of the flame nozzle 14 is high and the amount of air-fuel mixture is large, which are typical causes of flame instability, and matching with air is the biggest factor. Therefore, the air injection plate 1 is designed with a focus on the jetting conditions of the flame-stabilizing air that has been depressurized in the flame-stabilizing chamber 5 from the flame-stabilizing air port 10, but the amount of springback on the inclined surface 2 is large. Variations are likely to occur during mass production, and as a result, the air jet speed from the flame stabilizing air port 10 varies greatly, making it impossible to optimize the mixture with the multilayer mixture at the end of the flame port 14, which impairs combustibility. Was.

As described above, in the conventional combustion apparatus, since there is no flame stabilizing structure on the flame port 14 side, it is difficult to realize flame stabilization at the end of the flame port 14 where the air-fuel mixture flow velocity is high. In addition, although matching with air is the biggest factor, the provision of the flame stabilizing plate 6 itself creates gaps in the structure, resulting in variations in the amount of flame stabilizing air, and only the flame stabilizing air is used. However, it was not possible to stabilize the flame. As a result, it induces flame instability,
There was a problem that the flammability limit was worsened and the combustion noise value increased.

The present invention is intended to solve these problems, and aims to provide a high-load combustion device with low noise and improved combustibility.

Means for Solving the Problems In order to solve this problem, the present invention forms auxiliary flame ports in the longitudinal direction on both sides of the flame port part, provides air injection plates on both sides of the auxiliary flame ports in the longitudinal direction, and The air injection plate has a horizontal plane, a vertical plane, and an inclined plane successively formed from the bottom to form an air chamber inside the air injection plate on both sides of the flame opening,
The horizontal surface is formed on the upstream side of the auxiliary flame port, the vertical surface is formed from the upstream side to the downstream side of the auxiliary flame port, and the inclined surface is formed on the downstream side of the auxiliary flame port, and the horizontal surface or the vertical surface is formed for flame holding. The inclined surface is provided with a number of main air ports.

Effect With the above-mentioned configuration, the main flame formed at the flame mouth is stabilized by the stable flame of the auxiliary flame mouths provided on both sides of the flame mouth in the longitudinal direction, and the bending process of the slope surface varies and the flame holding air It is possible to prevent the flame from becoming unstable due to an increase or decrease in the amount of flame-holding air due to an increase or decrease in the amount of flame-holding air due to an increase or a structural variation, thereby improving combustibility and reducing noise.

Embodiments Hereinafter, embodiments in which the present invention is applied to a water heater will be described based on FIGS. 1 to 4.

First, in FIGS. 1 to 3 showing the first embodiment, 21
2 is a combustion device main body, and a fan 22 and a fuel supply pipe 23 are attached to the bottom of this main body 21. Inside the main body 21, a plurality of burners 24 are provided on the downstream side of the fuel supply pipe 23, an air injection plate 25 is fitted between the burners 24, and an air chamber 26 is provided on the upstream side thereof. A combustion chamber 27 is formed on the downstream side. A flame port 29 having a large number of flames 028 is provided downstream of the burner 24 . An auxiliary flame outlet plate 31 for forming an auxiliary flame outlet 30 is provided on the outer side of the flame outlet part 29 in the longitudinal direction on both sides, and an auxiliary flame plate 31 for forming an auxiliary flame outlet 30 is provided on both side walls of the flame outlet part 29 along the longitudinal direction. An auxiliary mixture passage 32 communicating with the port 30 is formed.

By the way, the air injection plate 25 has an inclined surface 33, a vertical surface 34, and a horizontal surface 35 located on both sides of the auxiliary flame port 30 in the longitudinal direction.
are formed continuously from above, the horizontal surface 35 is on the upstream side of the auxiliary flame port 30, the vertical surface 34 is on the downstream side from the upstream side of the flame port 28° and the auxiliary flame port 30, and the inclined surface 33 is the flame 028, A main air port 36 is formed on the downstream side of the auxiliary flame port 30, and a continuous mountain-shaped main air port 36 is provided on the inclined surface 33.
A small passage 37 is formed near the lower end of the chamber 37 to communicate the reduced pressure chamber 38 formed between the vertical surface 34 and the auxiliary flame port plate 31 with the air chamber 26 . 39 is a heat exchanger provided on the downstream side of the combustion chamber 27 inside the upper end of the main body 21, and 40 is an exhaust port provided at the upper end of the main body 21.

In the above configuration, a part of the combustion air supplied from the fan 22 enters the burner 24 together with the fuel supplied from the fuel supply pipe 23, becomes an air-fuel mixture, flows out into the combustion chamber 27 from the flame port 28, and causes a flame. form. Most of the combustion air reaches the air chamber 26 and is fed through the main air port 36 toward the flame at a specific axial speed. At this time, since the main air port 36 is provided in a continuous mountain shape, a flame is formed along this, and the combustion reaction surface is dramatically expanded, so the flame length becomes small and high-load combustion is achieved.

On the other hand, a part of the combustion air supplied to the air chamber 26 is depressurized while passing through the small passage 37, is further homogenized in the decompression chamber 38, and is supplied to the downstream area where it passes through the auxiliary flame port 30 and the flame 1]28. reacts with the air-fuel mixture from the flame base, stabilizes the flame base, increases combustibility, and suppresses combustion noise. The combusted high-temperature gas reaches the heat exchanger 39, heats water, and then becomes low-temperature exhaust gas and is released into the atmosphere from the exhaust port 40.

In this way, the auxiliary flames [
Since the air-fuel mixture regulated by the auxiliary air-fuel mixture passage 32 is supplied to 130, a stable flame can be formed at low load, and the flame holding effect is enhanced. Therefore, the performance of the main flame of the flame port 28 is improved even when a large load increase is set. In addition, the effect of homogenizing the flame-stabilizing air in the decompression chamber 38 is added, and the control over increase and decrease of the flame-stabilizing air can be extremely simple. Therefore, the flame is stable regardless of air-fuel mixture fluctuations ('I' D R properties) and air fluctuation conditions, and low-noise, high-load combustion can be realized.

Although the first embodiment has been described above, the second embodiment shown in FIG.
As in the embodiment, the horizontal surface 35 inside the air chamber 26
A flame stabilizing chamber 42 surrounded by a flame stabilizing plate 41 is formed on the lower side, and a small passage 43 provided in the flame stabilizing plate 41 communicates the air chamber 26 with the flame stabilizing plate 41. The present invention can also be implemented in a combustion apparatus provided with a flame-holding air port 44 that communicates the flame chamber 42 with the decompression chamber 38.

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

(1) The auxiliary flame ports installed on both sides of the flame port in the longitudinal direction are supplied with a regulated air-fuel mixture through the auxiliary mixture passage, so a stable flame is formed at low load, significantly enhancing the flame holding effect for the main flame. This contributes to stability, improves high-load combustibility, improves air-fuel mixture control, and significantly improves TDR characteristics.

(2) Since the downstream area of the flame opening is used as a decompression chamber, the air leaks out at a homogeneous rate before reacting with the air-fuel mixture, including the increase in flame-holding air due to variations in side effects, ensuring a stable air supply. This greatly reduces turbulence at the base of the flame, prevents noise generation, and reduces noise.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is an enlarged perspective view of a main part of a high-load combustion device, FIG. 2 is an enlarged sectional view of a main part of the same device, and FIG. Figure 4 is an enlarged sectional view of the main parts of the embodiment of the pond of the present invention, Figure 5 is an enlarged perspective view of the main parts of the conventional example, and Figure 6 is an enlarged sectional view of the same main parts. It is. 25... Air injection plate, 26... Air chamber, 27...
Combustion chamber, 28...flame [1, 29...flame port, 30.
...Auxiliary flame port, 31...Auxiliary flame plate, 32...Auxiliary mixture passage, 33...Slope surface, 34...Vertical surface, 3
5...Horizontal surface, 36...Main air [1, 37...Small passage, 38...Decompression chamber, 41...Flame holding plate, 42...
・Flame holding room, 43...Small passage, 44...Flame holding air vent. 25---rtE'-n46 Ki treatment Fig. 2 Fig. 5 Fig. 5 1/l child (

Claims (1)

[Claims] 1. Forming auxiliary flame ports in the longitudinal direction on both sides of the flame port, and providing air injection plates on both sides of the auxiliary flame port in the longitudinal direction,
This air injection plate has a horizontal surface, a vertical surface, and an inclined surface successively formed from the bottom to provide an air chamber inside the air injection plate on both sides of the flame port, and the horizontal surface is on the upstream side of the auxiliary flame port. The vertical surface is formed from the upstream side to the downstream side of the auxiliary flame port, and the sloped surface is formed on the downstream side of the auxiliary flame port, and an air port for flame stabilization is provided on the horizontal surface or the vertical surface, and an air port is formed on the sloped surface. is a high-load combustion device with many main air ports.