JP3049318B1 - Combustion equipment - Google Patents

Abstract

A combustion apparatus capable of performing stable combustion, reducing the generation of CO and HC, and suppressing the generation of NO _X while making use of the advantage of the diffusion method of reducing flashback. Develop. SOLUTION: The stove comprises a combustion part 2, a throttle plate 3, a porous body 5, and a heat ray permeable body 6. The flame hole member 20 incorporated in the combustion part 2 has a cross groove-shaped space 32. The air injection holes 30 are provided in the inner wall surfaces 33 and 35 of the gap 32. The air injection hole 30 is provided at the bottom 37 (the lower plate 2).
2) are arranged in five rows of a, b, c, d, and e toward the open side 38, and the air injection holes 30a to 30 in each row are arranged.
e are staggered from each other. The size of the air injection holes 30 in each row gradually decreases from the bottom 37 (the lower plate 22 side) toward the open side 38. Therefore, a chance of contact between the fuel gas and the air is reliably ensured, and an appropriate amount of air is supplied according to the combustion timing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a combustion device occurs with less NO _X. INDUSTRIAL APPLICABILITY The combustion device of the present invention is suitable as a stove for home use or business use.

[0002]

2. Description of the Related Art Air pollution occurs on a global scale and is trying to destroy our living environment. Therefore, although regulations are being made in each field and efforts are being made to prevent air pollution,
It can be said that it is far from improving the environment. With respect to NO _X is one of the factors of air pollution, total emissions in Japan of the year was 130 million tons of which emissions from household combustion equipment such as a stove, it is estimated 30,000 tons. In these small-scale combustion devices, it is difficult to suppress the emission of NO _X by the combustion management technology on the user side, so it is necessary to reduce the NO _{X in the} stage of designing and manufacturing the device.

One of the measures for achieving this object is to employ so-called lean burn. Here, the lean combustion is a combustion method in which fuel gas and air are mixed in a lean state and burned. Since the temperature of the flame is relatively low, NO
_Low occurrence of _X. However, the lean combustion has a problem that the variable range (TDR) of the combustion fuel is narrow because the flame is unstable and a spark is easily generated.

[0004] In order to solve this problem, there has been proposed a combustion method referred to as opposed combustion or collision combustion. The opposed combustion is described in, for example, JP-A-62-242762,
JP-A-63-14007, JP-A-63-161308
This is a technique disclosed in Japanese Patent No.

[0005] As a method of mixing the fuel gas and air in a lean state, a method called a premixing method and a method called a diffusion method are known. The premixing method has a mixing chamber other than the combustion section, mixes a combustion gas and air at a predetermined ratio in the mixing chamber, and then injects the mixed gas from an injection hole to generate a flame. This method has an advantage that the flame is stabilized because the combustion gas and the air are sufficiently mixed, but has a disadvantage that flashback easily occurs. On the other hand, a method called a diffusion method in which air and combustion gas are mixed immediately before combustion is known, and according to this method, the occurrence of flashback is extremely small.

The structure of a diffusion type combustion apparatus which adopts opposed combustion and is of the diffusion type is generally as shown in FIGS. That is, FIG. 9 is a partial perspective view of a conventional combustion device. FIG.
FIG. 10 is a sectional view taken along line AA of FIG. 9. FIG. 11 is a cross-sectional view of FIG.
It is B sectional drawing.

[0007] Combustion apparatus 1 utilizing conventional opposed combustion
Reference numeral 00 denotes a linear groove 101 in which a large number of air injection holes 102 are provided on inner wall surfaces 103 and 105 of the groove 101. That is, the air injection hole 102 provided on one inner wall surface 103 and the air injection hole 102 provided on the other inner wall surface 105 face each other via the linear groove 101. Here, in the conventional combustion device 100,
The air injection holes 102 are arranged in a plane distribution on the inner wall surfaces 103 and 105, and are arranged in an array as shown in FIG. In the prior art, the size of the air injection holes 102 was the same, and the opening density of the air injection holes 102 was uniform over the entire inner wall surfaces 103 and 105.

The bottom 106 of the groove 101 has a structure shown in FIG.
11, the fuel gas injection holes 107 were provided. Here, in the conventional combustion device 100, the fuel gas injection holes 1
07 were provided in a single line at the center of the groove 101.

In the prior art combustion apparatus 100, air or air containing a lean fuel gas is applied to the inner wall surfaces 103, 105.
The fuel gas is injected from a fuel gas injection hole 107 into the air injection hole 102 provided in the fuel injection hole. Then, both are mixed to generate a flame in the groove 101,
Since the air injection holes 102 face each other and the flames collide with each other,
Fire is less likely to occur and the flame is stable.

[0010]

Since the combustion apparatus 100 shown in FIGS. 9 to 11 employs a diffusion method, the occurrence of flashback is small. However, in the above-described combustion apparatus 100, it is difficult to sufficiently mix the fuel gas and the air, and soot and yellow flame often occur. One of the causes is that in the conventional combustion device 100, a large number of air injection holes 102 are arranged on the inner wall surfaces 103 and 105. However, since the arrangement of the air injection holes 102 is aligned, This is because the fuel gas flows between the columns of the injection holes 102. That is, in general, in a combustion device that performs lean combustion, the air injection holes 10
The pressure of the air injected from the fuel gas injection holes 107
Higher than the pressure of the gas injected from the In the combustion device 1 of the related art, since the air injection holes 102 are arranged in an array, a pressure valley is generated between the columns, and the fuel gas flows through the valley as shown by an arrow in FIG. And lose the opportunity to mix. Therefore, a part of the fuel gas is discharged without being burned, and the concentrations of CO and HC increase.

Another cause is that in the combustion device 100 of the prior art, the entire inner wall surfaces 103 and 105
This is because the opening density of the air injection holes 102 was uniform. That is, in the combustion device 100, the bottom 106 of the groove 101
There is a base end of the flame in the vicinity, and as the combustion reaction progresses toward the open side of the groove 101, the bottom 10 of the groove 101
In the vicinity of 6, the largest amount of oxygen is required, and the open side does not require much oxygen. However, in the conventional combustion device, since the opening density of the air injection holes 102 is uniform, the open side is excessively in the air state, and the flame itself is not formed. Therefore, the concentrations of CO and HC increase.

Still another cause is that, in the conventional combustion device 100, the fuel gas injection holes 107 are provided in a single line at the center of the groove 101. That is, in the diffusion combustion method, the fuel gas and the air are mixed immediately before the combustion.
Fuel gas is injected from fuel gas injection holes 107 into the airflow injected from 3, 105. Here, ideally,
The air injected from both inner walls 103 and 105 has the same pressure, and the air should collide at the center of the groove 101, but the pressure of the air injected from both inner walls 103 and 105 is actually It is difficult to make Therefore, for example, as shown in FIG. 11, when the pressure of the air injected from the right inner wall surface 105 is higher than the pressure of the air injected from the left inner wall surface 103, the air is injected from the air injection holes 102 of the inner wall surface 105. Only the air that comes into contact with the fuel gas. Therefore, the generated flame is biased, resulting in incomplete combustion.

Therefore, the present invention pays attention to the above-mentioned problems of the prior art, and makes it possible to perform stable combustion while making use of the advantage of the diffusion method that there is little flashback, and to generate less CO and HC. generation of the NO _X also it is an object of development of the combustion apparatus can be suppressed.

[0014]

According to a first aspect of the present invention, there is provided an image forming apparatus, comprising: a space provided with opposed walls; at least one surface between the walls is opened; A plurality of air injection holes are arranged in a plane on the wall surface, and air or air containing a lean fuel gas is injected from the air injection holes, and the fuel gas is injected into the injected air and burned. A combustion device in which combustion gas generated by combustion is released from an open surface, wherein the air injection holes are arranged in a staggered manner toward the open surface.

In the combustion device of the present invention, air is injected from a plurality of air injection holes provided on the wall surface, and fuel gas is injected into the injected air to burn. Therefore, in the combustion device of the present invention, the flame collides. Further, in the combustion device of the present invention, the air injection holes are arranged in a staggered manner toward the open surface side. Therefore, in the combustion device of the present invention, there is no pressure valley which is a problem in the prior art. In other words,
In the combustion device of the present invention, since the air injection holes are arranged in a staggered manner toward the open surface side, the fuel gas flowing toward the open side often encounters air injected from the air injection holes. Therefore, in the combustion device of the present invention, the fuel gas and the air are more reliably stirred. As described above, the combustion apparatus of the present invention combines the point where the flame collides with the point that the stirring of the fuel gas and the air is performed more reliably, and the flame is stable and the generation of CO and HC is reduced, and The generation of NO _X is also small.

A second object of the present invention is to achieve the same object.
The invention described in (1) has a wall provided with an air gap and opposing walls, at least one surface between the walls is opened, and a plurality of air injection holes are distributed in a plane on the wall, and the air injection Air or air containing a lean fuel gas is injected from the hole, the fuel gas is injected into the injected air and burned, and the combustion gas generated by the combustion is released from an open surface; The hole is a combustion device characterized in that the opening density on the open surface side is smaller than that on the fuel gas injection side.

The combustion device of the present invention has a function of causing a flame to collide, similarly to the above-described combustion device. In addition, in the combustion device of the present invention, the air injection holes have a lower opening density on the open surface side. Therefore, the combustion device of the present invention
There is no excess air on the open side, and a flame is reliably formed.

Further, the present invention according to claim 3 has a wall having opposing walls provided with a gap, at least one surface between the walls is open, and a plurality of air injection holes are distributed in a plane on the wall. One or more fuel gas injection holes are opened in the gap, and air or air containing a lean fuel gas is injected from the air injection holes, and the fuel gas injection holes are injected into the injected air. Fuel gas is injected from and burns,
In a combustion device in which combustion gas generated by combustion is released from an open surface, a portion of the wall near one or a group of fuel gas injection holes has a lower opening density of air injection holes than other portions, and A combustion apparatus characterized in that air injection holes are arranged in a row on a side portion of a region from one or a group of fuel gas injection holes to an open surface.

The combustion device of the present invention has a function of colliding a flame similarly to the above-described combustion device. In addition, in the combustion apparatus of the present invention, the opening density of the air injection holes is lower in the vicinity of one or one group of the fuel gas injection holes than in other portions. Therefore, in the vicinity of the fuel gas injection hole, a portion where the air injection is small and the pressure is locally low is formed.
On the other hand, in the combustion device of the present invention, the air injection holes are arranged in a row on the side of a region from one or a group of fuel gas injection holes to the open surface. As a result, air is injected around the fuel gas injection holes, and the pressure at that portion increases, so that a kind of air curtain is formed around the fuel gas injection holes. Therefore, the fuel gas flows to a portion where the pressure is locally low and does not spread to the surroundings. Thus, the fuel gas is reliably mixed with the air. As described above, the combustion device of the present invention combines the point where the flame collides with the point where the stirring of the fuel gas and the air is more reliably performed, so that the flame is stable and the generation of CO and HC is small,
In addition, generation of NO _X is small.

Further, according to a fourth aspect of the present invention, there is provided one or more rows of air injection holes provided to face each other, and a fuel gas injection provided between the air injection holes or the rows of air injection holes. In the combustion device having a hole, air or air containing a lean fuel gas is injected from the air injection hole, and the fuel gas is injected from the fuel gas injection hole into the injected air, the fuel gas injection hole is A combustion device, wherein a plurality or a plurality of rows are provided between air injection holes.

In the combustion apparatus of the present invention, air is injected from air injection holes provided to face each other, and fuel gas is injected into the injected air, and has a function of causing a flame to collide. . In the present invention, a plurality or a plurality of rows of fuel gas injection holes are provided between the air injection holes. Therefore, in the combustion device of the present invention, the fuel gas injection holes are closer to the air injection holes than in the prior art. Therefore, even if there is a difference in the pressure of the air injected from the opposed air injection holes, the fuel gas and the air are more reliably mixed. As described above, the combustion apparatus of the present invention combines the point where the flame collides with the point that the stirring of the fuel gas and the air is performed more reliably, and the flame is stable and the generation of CO and HC is reduced, and The generation of NO _X is also small.

According to a fifth aspect of the present invention, the distance between the air injection hole or the fuel gas injection hole array closest to the air injection hole or the air injection hole array and the air injection hole or the air injection hole array is The combustion apparatus according to claim 4, wherein a distance between the fuel gas injection holes at the center of the air injection holes or the row of the air injection holes facing each other is narrower.

The combustion device of the present invention is a configuration recommended when there are two or more or two or more rows of fuel gas injection holes. That is, in the combustion device of the present invention, the fuel gas injection holes are located near the air injection holes, and are few at the center. Therefore, even if there is a difference in the pressure of the air injected from the opposed air injection holes, the fuel gas and the air are more reliably mixed.

According to a sixth aspect of the present invention, there is provided the combustion apparatus according to any one of the first to fifth aspects, wherein the groove has an intersecting groove, and an air injection hole is provided on a wall surface of the groove. Device.

The combustion device of the present invention has crossed grooves,
An air injection hole opens toward the groove. For this reason, the arrangement of the grooves, which has been linear in the past, has a planar spread, and matches the shape of the bottom of the pot. Further, the combustion device of the present invention has a smaller outer shape as compared with a combustion device of the related art that generates the same amount of heat.

[0026]

Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of a stove according to an embodiment of the present invention. FIG. 2 is a perspective view and an exploded perspective view of a flame hole member used in the stove of FIG. FIG. 3 is a cross-sectional view of the flame hole member of FIG. 2 taken along line CC. FIG. 4 is a sectional view of the flame hole member of FIG.
It is -D sectional drawing. FIG. 5 is a cross-sectional view corresponding to C-C of a flame hole member according to another embodiment of the present invention. FIG. 6 is a cross-sectional view corresponding to C-C of a flame hole member according to another embodiment of the present invention. FIG. 7 is a cross-sectional view corresponding to DD of a flame hole member according to still another embodiment of the present invention. FIG. 8 is a front view of a flame hole member according to another embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a stove according to an embodiment of the present invention. The stove 1 is intended to be mainly used at home, and is largely composed of a combustion section 2, a throttle plate 3, a porous body 5, and a heat ray permeable body 6. The combustion section 2 has a case 15 constituted by a lower member 10, an intermediate member 11, and a lid member 12, and a flame hole member 20 is disposed inside the case 15.

That is, the lower member 10 of the case 15 is cylindrical, one end (upper side in the drawing) is open, and the other end is closed. A flange 13 is provided on the open side.

The intermediate member 11 has a flange 14 at one end (lower side in the drawing) and is open at the other end. The lid member 12 is a member provided with an opening 16 in the center. The periphery of the opening 16 of the lid member 13 is folded vertically. The case 15 is formed by stacking the three members of the lower member 10, the intermediate member 11, and the lid member 12 described above.

As shown in the exploded perspective view of FIG. 2 (a), the flame hole member 20 has an upper plate 21 and a lower plate 22, and a cross-shaped side wall member 23 is provided between the two. . That is, the upper plate 21 has a disk shape and a cross-shaped opening 2 at the center.
5 is provided.

The lower plate 22 is disk-shaped, and has two rows of small holes intersecting as shown in the figure. The small holes function as fuel gas injection holes 27.

The side wall member 23 has a cross shape surrounded by a thin steel plate, and is provided with a number of small holes serving as the air injection holes 30. The air injection holes 30 are provided with a planar spread at all parts except the outermost plane.

The flame hole member 20 is provided on the lower plate 2 as shown in FIG.
2, the side wall member 23 and the upper plate 21 are sequentially stacked, and have a cross-shaped groove 32 with an open upper portion. That is, the arm portion of the cross groove in the gap 32 has parallel inner wall surfaces 33 and 35, and the wall surfaces are opposed to each other. In this embodiment, since the shape of the space 32 is a cross-groove shape, the space 32 has four sets of opposed inner wall surfaces 33 and 35.

The air injection holes 30 are provided on the inner wall surfaces 33 and 35. Here, the distribution state of the air injection holes 30 in the present embodiment is as shown in FIG. That is, in the present embodiment, the air injection holes 30 are formed from the bottom 37 (the lower plate 22 side) toward the open side 38 by a, b,
The air injection holes 30a to 30d in each row are arranged in a staggered manner. More specifically, the projection position of the first row of air injection holes 30a is on the extension of the center line of the fuel gas injection holes 27 as shown in FIG. 3, and is in the longitudinal direction (lateral direction in the drawing) of the groove portion. On the other hand, they are arranged at equal intervals. On the other hand, the second row of air injection holes 30b is provided in the space between the first row of air injection holes 30a. And the second row of air injection holes 30
b, there is a third row of air injection holes 30c in the space between them.
A fourth row of air injection holes 30d is provided in the space between the rows of air injection holes 30c, and a fifth row of air injection holes 30e is provided in the space between the fourth rows of air injection holes 30d.

The size of the air injection holes 30 in each row gradually decreases from the bottom 37 (the lower plate 22 side) toward the open side 38. Therefore, between each air injection hole,
There is the following relationship:

30a ≧ 30b ≧ 30c ≧ 30d ≧ 30e

Accordingly, the opening density of the air injection holes 30 decreases toward the open side 38.

FIG. 4 shows the distribution of the fuel gas injection holes 27 in this embodiment. That is, in the present embodiment, the fuel gas injection holes 27 are arranged in two rows at the bottom 37 of the gap 32. And the fuel gas injection holes 27,
Distance between inner wall surface 33 or inner wall surface 35 (closer distance)
Is shorter than the distance between the fuel gas injection holes 27. That is, the interval 1 between the row of the fuel gas injection holes 27 closest to the row of the air injection holes 30 and the air injection hole 30 is larger than the interval L between the fuel gas injection holes 27 at the center of the opposed air injection holes 30. narrow.

The flame hole member 20 is connected to the case 15 as described above.
Of the intermediate member 11 of the
The outer diameter of 0 is smaller than the inner diameter of the intermediate member 11. Therefore, there is a gap 36 between the flame hole member 20 and the inner wall of the case 15 as shown in FIG. The groove-shaped gap 32 of the flame hole member 20 is
The case 15 faces the opening 16 of the lid member 12 of the case 15, and the gap 32 is exposed to the outside through the opening 16.
On the other hand, a portion near the outer periphery of the top surface of the flame hole member 20 is in contact with the inner surface of the lid member 12 via a packing (not shown). Therefore, the gap 36 and the outside communicate only with the air hole 30 of the flame hole member 20.

In the case 15, a fuel gas chamber 39 is provided on the upstream side of the flame hole member 20, that is, on the bottom side (with reference to the posture in the drawing), as shown in FIG. Is connected to two gas introduction tubes 40.
The gas introduction pipe 40 is connected to a propane gas cylinder (not shown). Therefore, the inside of the fuel gas chamber 39 is filled with the propane gas as the fuel gas, and the fuel gas injection holes 27 provided in the bottom 37 of the cross-shaped groove 32 of the flame hole member 20 are provided.
From the fuel gas.

In the case 15 employed in this embodiment, an air introduction pipe 41 is connected to the bottom surface. The air introduction pipe 41 is connected to a blower (not shown), and introduces air into the case 15.

The diaphragm plate 3 is a circular plate having a thickness of about 3 mm to 10 mm, and a combustion gas passage opening 43 is provided at the center.

The porous body 5 is specifically a porous body made of ceramic. As the material of the porous body 5, aluminum titanate, mullite, cordierite or a mixed material thereof can be used, but in terms of excellent heat resistance,
Aluminum titanate is most suitable. The thickness of the porous body 5 is about 3 mm to 20 mm, more preferably 3 mm to 20 mm.
It is about 10 mm. The porosity of the porous body 5 is 75
% To 85%.

The shape of the porous body 5 is a disk shape. At the center of the back surface (upstream side) of the porous body 5, a circular closing member (not shown) is provided, and the portion has no air permeability. The heat ray transmitting body 6 does not allow liquid to pass through, but transmits heat rays such as infrared rays, and employs a transparent heat-resistant member. Specifically, quartz glass is used. The heat ray transmitting body 6 has a disk shape, and has an opening 45 at the center. The heat ray transmitting body 6 has a function of preventing the spill from the pan from falling into the stove 1.

In the stove 1, a throttle plate 3 is placed on the combustion section 2, and a porous body 5 is further disposed thereon.
The heat ray transmitting body 6 is arranged at the uppermost part. A packing is provided between each of them so that the gas does not leak from the gap.

Next, the operation of the stove 1 of the present embodiment will be described. The stove 1 receives air from a blower (not shown) and is blown into the case 15 from the air introduction pipe 41.
At the same time, a gas inlet pipe 4
The fuel gas is introduced into the case 15 through 0 and used. That is, the air that has entered the case 15 from the air introduction pipe 41 flows into the gap 36 between the periphery of the flame hole member 20 and the inner surface of the case 15, and the space between the upper plate 21 and the lower plate 22 of the flame hole member 20. Flow in. Then, the air is injected from each of the air injection holes 30 provided in the side wall member 23 into the gap 32 between the opposed inner wall surfaces 33 and 35.

Here, in the stove 1 of the present embodiment, the opening density of the air injection holes 30 in the inner wall surface of the flame hole member 20 decreases from the bottom 37 toward the open side. Therefore, the amount of air flowing into the gap 32 decreases as it goes to the open side as shown in FIG. The air injection holes 30 are
Since they are arranged in a zigzag pattern, there is no valley in atmospheric pressure.

On the other hand, the fuel gas is injected into the space 32 through the fuel gas chamber 39 from the fuel gas injection hole 27 provided at the bottom 37 of the space 32 having a cross groove shape. Here, in the stove 1 of the present embodiment, the fuel gas injection holes 27 are provided in two rows at the bottom 37 of the gap 32, and both rows are located at the inner wall surfaces 33, 35, that is, at positions near the air injection holes 30. It is provided in. Therefore, the fuel gas injected from the fuel gas injection holes 27 surely collides with the air injected from the air injection holes 30. In addition, in the stove 1 of the present embodiment,
Since the air injection holes 30 are arranged in a staggered manner, the combustion gas must pass near one of the air injection holes 30 until the combustion gas exits from the open side 38.
The collision between the fuel gas and the air is more reliable.

Thus, in the stove 1 of the present embodiment, the fuel gas and the air are mixed in a lean state (excess air ratio of 1.4 to 3.0) in the cross groove-shaped space 32. Air injection hole 3
Since 0 is provided on both sides of the inner wall surfaces 33 and 35 of the groove 32, the mixed gases collide with each other immediately. Therefore, the generated flames collide with each other and burn in a stable state. In addition, in the stove 1 of the present embodiment, the opening density of the air injection holes 30 decreases as going from the bottom 37 of the gap 32 toward the opening side, and the amount of air flows toward the opening side as shown in FIG. Therefore, a large amount of air is supplied at the base end of the flame, and weak ventilation is performed at the front end of the flame. Therefore, an appropriate amount of air is supplied according to the timing of the combustion reaction, and the flame is stabilized. In this embodiment, since the air injection holes 30 are provided in the cross-shaped grooves, the air injection holes 30 are distributed with a planar spread. Therefore, the flame is generated with a planar spread.

In the stove 1 of the present embodiment, the flame and the combustion gas are throttled by the throttle plate 3 and enter between the porous body 5 and the throttle plate 3 through the combustion gas passage opening 43. Then, the combustion gas spreads over the entire cavity and enters the porous body 5 evenly. The combustion gas passes through the porous body 5 and is injected to the outside through the opening 45 of the heat ray transmitting body 6, and hits the bottom of the pot or the like (not shown) to heat the pot or the like.

On the other hand, when the combustion gas passes through the porous body 5, the porous body 5 is heated, and the porous body 5 glows red. As a result, heat rays are emitted from the porous body 5, and the heat rays are
The light passes through the heat ray transmitting body 6 and is irradiated on the bottom of a pan (not shown). Therefore, the pan is also heated by the heat rays radiated from the porous body 5. Therefore, the stove 1 of the present embodiment can heat a pot or the like by both convection heating with combustion gas and radiant heating with hot wire, and has the effect of high thermal efficiency. Further, as described above, the stove 1 of the present embodiment is used.
In this case, since the flame is generated with a planar spread, the bottom of the pot or the like can be heated without waste. Furthermore, since the stove 1 of the present embodiment burns the fuel gas in a lean state, the generation of NO _X is small.

In the stove 1 of the embodiment described above, the air injection holes 30 are arranged in a zigzag manner on the inner wall surfaces 33 and 35 opposed to each other with the gap 32 therebetween. (The lower plate 22 side) It designed so that it may become small gradually as it goes to the open side 38. This configuration,
Although the configuration is the most recommended, as shown in FIG. 5, there is a considerable effect even if the sizes of the air injection holes 30 are all the same and the arrangement thereof is simply staggered. Further, it is desirable that all the air injection holes 30 are arranged in a staggered manner, but a staggered part or an aligned part may be mixed.

Even if the arrangement of the air injection holes 30 is aligned, a considerable effect can be expected if the opening density on the open side is smaller than that on the fuel gas injection side. In the above-described embodiment, the opening density is reduced by changing the size of the air injection holes 30. However, the same effect is exerted even when the number of the air injection holes 30 decreases toward the open side. .

In the above embodiment, the air injection holes 30
Shows an example in which the air injection holes 30 are arranged evenly in the direction along the grooves (grooves forming the air gaps 32). However, as shown in FIG. If the air injection holes are thinned out only at the position corresponding to the position of the fuel gas injection holes 27, a specific effect can be expected. That is, in the configuration shown in FIG. 6, the fuel gas injection holes 27 are provided in groups of three. In contrast, the air injection holes 30
The row a closest to the fuel gas injection hole 27 has no opening at a portion corresponding to the fuel gas injection hole 27. The other rows b to e have openings on the open side of the fuel gas injection holes 27. On the side of the portion 50 of the bottom portion 37 where the fuel gas injection holes 27 are thinned out, the air injection holes 30 are arranged in a line from the row a immediately near the bottom 37 to the row e on the open end side.

In this embodiment, since there is no air injection hole in the portion immediately adjacent to the position corresponding to the position of the fuel gas injection hole 27,
There is no direct ventilation at the location where the fuel gas is injected.
Therefore, the pressure of this part (the part surrounded by the two-dot chain line in FIG. 6) is low.

In this embodiment, the fuel gas injection holes 27
Are arranged in rows on both sides of the group 52.
More specifically, the range 55 surrounded by the alternate long and short dash line on both sides of the group 52 of the fuel gas injection holes 27 is
The air injection holes 30 are arranged in a row from the row a closer to 7 to the row e closest to the open side. That is, the wall 3
The air injection holes 30 are arranged in a row on the side portion of the region from the lower portion 37 of 3.35 to the open side 38. Since air is injected from each of the air injection holes 30, a high pressure region is generated on both sides of the group 52 of the fuel gas injection holes 27 from a portion near the bottom 37 to the open side 38. That is, a kind of air curtain appears in a range 55 surrounded by a dashed line on both sides of the group 52 of the fuel gas injection holes 27.

As described above, the fuel gas is injected into the low-pressure area 50 surrounded by the two-dot chain line, and an air curtain exists around the fuel gas. Proceed to 38. Therefore, the fuel gas injected from the fuel gas injection holes 27 is surely mixed with air and burns stably.

It should be noted that this embodiment is particularly recommended when there is a situation where the air injection holes 30 cannot be evenly distributed. That is, depending on the size and layout of the stove, the inner wall surface on which the air injection holes 30 are provided may be screwed into
(FIG. 6) in some cases, and when such a configuration is employed, it is difficult to provide an air injection hole in a column in which the screw 56 exists. As a result, the fuel gas may escape to the row where the screw 56 is present, and lose the opportunity to mix with the air.
On the other hand, as in the present embodiment, a portion where the opening density of the air injection holes is lower than that of the other portions is provided near the fuel gas injection hole group (near the low portion 37). By arranging the air injection holes in a row on the side portion of the region from the opening to the open surface, it is possible to prevent the escape of the fuel gas to the screw 56 side. In the above-described embodiment, the configuration in which the fuel gas injection holes 27 are arranged in groups of three is described as an example. However, the number of the fuel gas injection holes 27 forming the group is arbitrary, and only one fuel gas injection hole 27 is formed. The above-described configuration may be adopted for the injection hole 27.

In the above embodiment, the fuel gas injection holes 2
Although the fuel gas injection holes 27 are provided in two rows, three or more fuel gas injection holes 27 may be provided. FIG. 7 shows an example in which four rows of fuel gas injection holes 27 are provided. When four or more rows of the fuel gas injection holes 27 are provided, the fuel gas injection holes 27 are disposed with emphasis on the inner wall surfaces 33 and 35 side, and the fuel gas injection holes 27 closest to the row of the air injection holes 30 are arranged. It is desirable that the interval 1 between the rows of the injection holes 27 is smaller than the interval L between the fuel gas injection holes 27 at the center of the air injection holes 30 facing each other.

In the embodiment described above, the flame hole member 20
The cross-shaped groove is illustrated as an example in which a groove having the same width is provided. However, the present invention is not limited to the one having the cross-shaped groove, and for example, as shown in FIG. 8A, the groove width may be widened toward the central portion. Further, the shape may be close to a star shape as shown in FIG. Alternatively, the shape may be annular as shown in FIG. Further, the shape may be a “T” shape, a “Y” shape, or a “US” shape. Of course, a linear gap can also be employed.

In the above embodiment, the air injection holes 3
Although a configuration in which only air is injected from zero has been described, a lean fuel gas may be mixed into the air. Conversely, some air may be mixed in the fuel gas injected from the fuel gas injection holes 27.

In the above embodiment, the fuel gas is
Although propane gas has been exemplified, the type of gas is not limited to this, and any other fuel gas can be used.

[0063]

As described above, in any of the first to sixth aspects of the present invention, the air injection holes are provided to face each other.
The flames collide. In addition, in the combustion device according to the first aspect, since the air injection holes are arranged in a staggered manner toward the open surface side, there are many opportunities for contact between the fuel gas and the air. Therefore, the combustion device according to claim 1 combines a point where the flame collides with a point where the stirring of the fuel gas and the air is more reliably performed, so that the flame is stable and the generation of CO and HC is small, In addition, there is an effect that generation of NO _X is small.

In the combustion device according to the second aspect of the present invention, the opening density of the air injection holes on the open surface side is low, so that the air is not excessively formed on the open surface side, and the flame is reliably formed. Therefore, there is an effect that the flame is stable, the generation of CO and HC is small, and the generation of NO _X is also small.

Further, in the combustion apparatus according to the third aspect, a portion where the air injection is low is intentionally formed and a kind of air curtain is formed around the portion, and the fuel gas is guided in a direction to collide with the air. I will This ensures that the fuel gas is mixed with the air. Therefore, the combustion device of the present invention combines the point where the flame collides with the point that the stirring of the fuel gas and the air is performed more reliably, so that the flame is stable, the generation of CO and HC is small, and NO _X There is an effect that the occurrence of occurrence is small.

In the combustion apparatus according to the fourth and fifth aspects, the fuel gas and the air are more reliably mixed even if there is a difference in the pressure of the air injected from the opposed air injection holes. Stirring with air is performed more reliably, and there is an effect that the flame is stable, the generation of CO and HC is small, and the generation of NO _X is also small.

In the combustion device according to the sixth aspect of the invention, the injection holes have crossed grooves, and the injection holes are open toward the grooves. Therefore, the arrangement of the injection holes has a planar spread. Therefore, the combustion device of the present invention has an effect that the distribution of the flame can be easily matched to the shape of the bottom of the pot. Further, the combustion device of the present invention has an effect that the outer shape is smaller than that of the combustion device of the related art which generates the same heat generation value.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a stove according to an embodiment of the present invention.

FIG. 2 is a perspective view and an exploded perspective view of a flame hole member used in the stove of FIG. 1;

FIG. 3 is a sectional view of the flame hole member of FIG. 2 taken along line CC.

FIG. 4 is a cross-sectional view of the flame hole member of FIG. 2 taken along line D-D.

FIG. 5 is a cross-sectional view corresponding to CC of a flame hole member according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view corresponding to CC of a flame hole member according to another embodiment of the present invention.

FIG. 7 is a view showing a D- of a flame hole member according to still another embodiment of the present invention.
It is sectional drawing corresponding to D.

FIG. 8 is a front view of a flame hole member according to another embodiment of the present invention.

FIG. 9 is a partial perspective view of a conventional combustion device.

FIG. 10 is a sectional view taken along line AA of FIG. 9;

FIG. 11 is a sectional view taken along line BB of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stove 2 Burning part 15 Case 20 Flame member 27 Fuel gas injection hole 30 Air injection hole 32 Air gap 33,35 Inner wall surface 37 Bottom 38 Open side

Continued on the front page (72) Inventor Shuji Kameyama 93, Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor Ryoji Kutsuna 93, Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor Habitat Hidenori 93, Edo-cho, Chuo-ku, Kobe City, Hyogo Prefecture Inside Noritz Co., Ltd. (56) References JP-A-10-220715 (JP, A) JP-A-5-118512 (JP, A) JP 48-26262 (JP, B1) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F23D 14/58 F23C 11/00 329-330 F23D 14/02-14/10 F24C 3/08

Claims (6)

(57) [Claims] An air gap is provided, wherein at least one surface between the wall surfaces is opened, and a plurality of air injection holes are distributed in a plane on the wall surface. From the air or air containing a lean fuel gas is injected, fuel gas is injected into the injected air and burned,
A combustion device in which combustion gas generated by combustion is released from an open surface, wherein the air injection holes are arranged in a staggered manner toward the open surface. 2. An air gap having a plurality of air injection holes, wherein at least one surface between the wall surfaces is open, and a plurality of air injection holes are arranged on the wall surface in a planar manner. From the air or air containing a lean fuel gas is injected, fuel gas is injected into the injected air and burned,
A combustion device in which combustion gas generated by combustion is released from an open surface, wherein the air injection holes have a smaller opening density on an open surface side than on a fuel gas injection side. 3. An air gap is provided, and has opposing wall surfaces, at least one surface between the wall surfaces is open, and a plurality of air injection holes are arranged on the wall surface in a planar distribution. One or more fuel gas injection holes are opened, and air or air containing a lean fuel gas is injected from the air injection holes, and fuel gas is injected from the fuel gas injection holes into the injected air for combustion. And a combustion device in which combustion gas generated by combustion is released from an open surface.
Alternatively, in the vicinity of one group of fuel gas injection holes, the opening density of the air injection holes is lower than other parts, and the side surface of the wall extending from one or one group of fuel gas injection holes to the open surface is provided A combustion device having air injection holes arranged in a row. 4. An air injection system comprising: one or more rows of air injection holes provided to face each other; and a fuel gas injection hole provided between the air injection holes or the rows of air injection holes. In a combustion device in which air or air containing a lean fuel gas is injected from a hole, and fuel gas is injected from the fuel gas injection hole into the injected air, a plurality of fuel gas injection holes are provided between the air injection holes. A combustion device comprising a plurality of rows. 5. An interval between the fuel gas injection hole or the fuel gas injection hole row closest to the air injection hole or the air injection hole row and the air injection hole or the air injection hole row is set to be opposite to the air injection hole or the air injection hole row. The combustion apparatus according to claim 4, wherein the distance between the fuel gas injection holes at the center of the row of air injection holes is narrower. 6. An air injection hole having an intersecting groove, wherein an air injection hole is provided on a wall surface of the groove.
The combustion device according to any one of the above.