JPS6234098Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention mainly uses a fan to forcibly supply air to the flame to promote the combustion reaction, thereby realizing a shorter flame and downsizing the combustion machine. The present invention relates to a household combustion device.

Conventional configuration and its problems An example of a conventional configuration is shown in FIG. A burner port 2 is sandwiched from both sides by a concave portion of a burner body 1 formed of drawn aluminum material, and a mixture chamber 3 is formed at the bottom. A large number of flame stabilizing air ports 4 that supply air approximately parallel to the flow direction of the mixture are arranged in a straight line,
Also, an air injection plate 6, which is provided with a large number of inclined air ports 5 in a zigzag pattern that supplies air in an inclined manner, is fitted completely into the burner body 1 to form a flame stabilizing air 7 and an air chamber 8.
constitutes part of. A small protrusion 9 is provided on a part of the air injection plate 6, and a small gap 10 is provided between the air injection plate 6 and the burner body 1, so that the flame stabilizing chamber 7 and the air chamber 8 are communicated with each other.

Such a conventional configuration has the following problems. The air ejected from the flame stabilizing air port 4 at a relatively low speed has the effect of stabilizing the flame base. However, if the amount of supplied air is too small, the flame base becomes unstable, and sometimes a part of the flame base blows out air at a relatively high speed, causing the inclined air port 5, which has the effect of promoting the combustion reaction and shortening the flame length. This causes the flame to become unstable and the combustion noise to increase. On the other hand, if the amount of air supplied from the flame-holding air port 4 is too large, the flame will extend from the flame base, so unless the air jet speed supplied from the inclined air port 5 increases, the flame length will not become small and the total amount of air supplied If the amount decreases, poor combustion will occur. In addition, because the combustion set point is located in an area with a large amount of air, the thermal efficiency of hot water heaters and room heaters tends to decrease, and the combustion noise tends to increase somewhat.
Therefore, the machining accuracy of the small protrusion 9 that determines the amount of flame-holding air due to the small gap 10 has to be made strict, and high-precision assembly has also been required.

Purpose of the invention The present invention solves the problems of the conventional method, and aims to widen the permissible setting range of flame-holding air, facilitate assembly and processing, and improve the reliability of the combustion device.

Structure of the device In order to achieve this objective, the present invention includes a large number of flame-holding air ports that eject air from both sides of the flame port, which consists of a large number of flame ports, along the flow of the air-fuel mixture ejected from the flame port. In addition, a large number of inclined air ports are arranged in a zigzag or U-shape on both sides of the burner port in the longitudinal direction of the burner port to blow out air across the flow of the air-fuel mixture. The flame air port is arranged in the vicinity of a plurality of air ports located near the flame port portion among the many inclined air ports arranged.

With this configuration, the flame stabilizing air is distributed to the flame base at the position of the inclined air port closest to the flame opening among the flames formed along the inclined air ports arranged in a zigzag or U-shape. The creators and others have found that the closer the slanted air outlet is placed to the flame outlet, the shorter the flame will be, but on the other hand, the flame will be more likely to become unstable and the noise will be louder. . Therefore, by providing flame stabilizing air ports only in the vicinity of the plurality of inclined air ports located closest to the flame port, the entire flame can be stabilized by stabilizing the flame base where it is most unstable. become. Therefore, the number of flame stabilizing air ports is small, and even if the amount of flame stabilizing air due to small protrusions is small, the amount of air supplied per flame stabilizing air port is sufficient, so the flame is stabilized and the overall air supply is reduced. Stable combustion is ensured even in the region where the amount is small.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be explained below based on FIGS. 2 to 4. In the figure, the same components as in FIG. 1 are designated by the same numbers.

In FIGS. 2 and 3, a burner port consisting of a large number of burner ports 2 is sandwiched from both sides by a concave portion of the burner body 1 forming a bag-shaped air chamber 8, and a mixture chamber 3 is constructed below. There is. A part of the burner body 1 near the flame opening becomes a recessed part and forms part of a flame holding chamber 7. The air jet plate 6 is provided with a large number of slanted air ports 5 arranged in a zigzag pattern, and a flame holding air port 4 is provided near the plurality of slanted air ports 5 located near the flame port 2, and is fitted into the groove of the burner body 1. It is. Here, the air jet plate 6 has an inclined air port 5 and a flame stabilizing air port 4.
A large number of small protrusions 9 are provided between the burner body 1 and a small gap 10 between the burner body 1 and a formed part of the burner body 1, so that the air chamber 8 and the flame stabilizing chamber 7 are communicated with each other. Furthermore, a mixture distribution chamber 11 and a mixing pipe 12 are provided outside the burner body 1.

To explain the operation in the above configuration, the mixing tube 1
The air-fuel mixture supplied from the air-fuel mixture distribution chamber 11 enters the air-fuel mixture distribution chamber 11 and is distributed into the two air-fuel mixture chambers 3, flows out into the combustion chamber through the flame port 2, and forms a flame on the flame port. On the other hand, the combustion air is distributed and flows into the three air chambers 8, and most of it is ejected from both sides toward the flame from the inclined air ports 5 at a relatively high flow velocity. The combustion reaction is promoted by the forced air supply, and the surface area of the flame is greatly expanded along the inclined air ports 5 arranged in a zigzag pattern, so that the flame length becomes extremely short and the size of the combustion machine can be easily reduced. The remaining combustion air in the air chamber 8 is controlled to an appropriate flow rate through the small gap 10, and at the same time is depressurized and enters the flame stabilizing chamber 7 at a relatively low speed into the flame stabilizing air port 4.
More erupts. Here, the flame stabilizing air port 4 is provided so that only the flame base closest to the flame opening, which is the most unstable part of the zigzag flame formed along the inclined air port 5, is stabilized. . That is, this is the supply method that has the greatest effect on stabilizing the entire flame with the minimum amount of air, and the above explanation will be given based on FIG. 4. As mentioned above, if the amount of flame-holding air is too small, the combustion characteristics expressed in noise and CO/CO ₂ will become like that of conventional example A, and the noise at the combustion set point a will become large. On the other hand, if it is too large, the characteristics will become similar to those of conventional example B, and the combustion set point b will inevitably be in a region where the excess air ratio is large, where combustion performance is limited and thermal efficiency is reduced. In contrast, in this embodiment, even if the amount of air supplied from the flame holding air ports is made sufficiently large, the number of flame holding air ports is small, so the amount of flame holding air accounts for only a small amount of the total combustion air supplied. Each characteristic C can be maintained over a wide range of air volume per flame-holding air port.
can be realized, and the combustion set point C can be easily set in an appropriate range.

Effects of the Invention As is clear from the above explanation, the combustion apparatus of the present invention provides the following effects. (1) By providing flame stabilizing air ports only in the vicinity of the multiple inclined air ports located near the flame opening where the flame is most unstable, flame stabilization can be achieved with the minimum amount of air, resulting in a shorter flame. It is possible to increase the amount of air supplied from the slanted air port, thereby reducing combustion noise and improving combustion performance at the same time.

(2) Since the above performance can be obtained over a wide range of flame-holding air amounts, the allowable design range for small protrusions can be widened, increasing the reliability of the combustion device.

(3) By providing flame-holding air ports intermittently, the flame divided vertically by the zigzag-shaped inclined air ports is further divided horizontally, which significantly increases the flame surface area and further ensures a short flame. This makes it possible to further reduce the jet velocity from the inclined air port and reduce combustion noise.

(4) Since the number of flame-holding air ports is reduced, the number of processing steps is reduced and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional perspective view showing the main parts of a conventional combustion device, FIG. 2 is a cross-sectional view showing an embodiment of the present invention, and FIG. 3 is a partial cross-sectional perspective view of the main parts of FIG. FIG. 4 is a characteristic diagram showing combustion characteristics and noise characteristics in one embodiment of the present invention. 2...flame port, 4...flame holding air port, 5...slanted air port.

Claims (1)

[Scope of utility model registration request] A large number of flame-holding air ports are provided from both sides of a flame port consisting of a large number of flame ports to blow out air along the flow of the air-fuel mixture ejected from the flame port, and in the longitudinal direction of the flame port. A large number of slanted air ports are arranged in a zigzag or U-shape on both sides of the flame port portion to blow out air across the flow of the air-fuel mixture, and the flame stabilizing air ports are arranged in the slanted shape of the large number of arranged slanted air ports. A combustion device configured to be provided near a plurality of air ports located near the flame port portion among the air ports.