JP2003240212A - Combustion equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion equipment for performing the stabilized combustion by evenly injecting the homogeneous fuel gas over the whole length of an auxiliary burner port. <P>SOLUTION: This combustion equipment 1 provided with a main burner port 36 and the auxiliary burner ports 29a and 29b is also provided with rich gas flow passages 35a and 35b having a large cross sectional area and communicated with the auxiliary burner ports to supply the fuel gas to the auxiliary burner ports, and provided with a rich gas supply passage 47 having a small cross sectional area and opened in the rich gas flow passage to supply the fuel gas to the rich gas flow passage. The opening of the rich gas supply passage 47 in relation to the rich gas flow passage is formed at a position separated from the center of the rich gas flow passage, and opening direction of the rich gas supply passage 47 and/or the fuel gas injecting direction is arranged to direct toward the center of the rich gas flow passages 35a and 35b. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus, and more particularly to a combustion apparatus suitable for a rich / lean combustion system in which fuel gas is burned in a lean state.

[0002]

2. Description of the Related Art As a method for burning a fuel gas in a lean state, a rich-lean combustion method is known. Here, the rich-lean combustion method is a combustion method in which a main flame generated from a low-concentration fuel gas is adjacent to a supplementary flame in which a high-concentration fuel gas is burned. 2. Description of the Related Art As a combustion apparatus of a density combustion type used for a water heater or the like, there is known a combustion apparatus in which metal plates are stacked and a gas passage is formed by these voids.

Many prior art combustion devices of this type have
It is a stack of metal plates.The two central plates form a light gas passage through which a low-concentration fuel gas passes, and the two gas plates on each side form a rich gas flow through which a high-concentration fuel gas passes. Make a road. By the way, the combustion device adopting the rich-lean combustion method has a problem that fuel gas in an incompletely-combusted state is discharged from the main flame hole to the outside at the time of ignition, causing a gas odor to be felt. Therefore, the present inventors set the length of the rich gas flow path shorter than that of the light gas flow path, injecting the rich gas from the flame hole first at the time of ignition, and stabilizing the supplementary flame first to incomplete. A combustion device has been developed to prevent the discharge of fuel gas in a combustion state (Japanese Patent Application No. 2000-197074).

The above-mentioned combustion apparatus of Japanese Patent Application No. 2000-197074 is formed by stacking four metal plates, and the two central metal plates form a fresh gas flow path. A dense gas flow path is formed by the outer surface of the plate and the inner surface of the outer metal plate. The previously proposed combustion device not only has the effect of stabilizing the supplementary flame first at the time of ignition, but also has the effect that the structure is simple because it is made of four metal plates.

[0005]

However, Japanese Patent Application No. 2
In the combustion device disclosed in Japanese Patent Application Publication No. 000-197074, the flame-retarding holes are formed in the longitudinal direction with respect to the fuel gas nozzle provided on the side portion of the combustion device, and the rich gas flow path leading to the flame-retarding holes is formed. The length of the shape was significantly different at each part in the longitudinal direction of the flame-supplementing hole.

Therefore, at the time of ignition, although a sufficient amount of rich gas is ejected at one end of the flame-retarding hole, the other end of the flame-retarding hole is richer in concentration than the timing at which the light gas is injected from the main flame hole. There was a phenomenon that gas was ejected. In addition, there was a large difference in the amount of concentrated gas ejected at each part in the longitudinal direction of the supplementary flame hole.

Therefore, although the rich gas passage is shorter than the light gas passage, the supplementary flame cannot be stabilized prior to the main flame, and the supplementary flame length is biased. Due to the unevenness, the flame-retarding property was deteriorated. As a result, at the time of ignition, a part of the light gas becomes an unburned component such as hydrocarbon (HC) and is discharged as it is, causing a bad odor, irritation to the eyes, or a fire jump. .

[0008] Therefore, the present invention focuses on the above-mentioned problems of the prior art, and while taking advantage of the advantages of the invention proposed above, by forming a stable supplementary flame prior to the main flame, the ignitability and the flame retardant property are improved. It is an object to develop an excellent combustion device.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the following technical means were taken. In other words, the present invention according to claim 1 injects a main flame hole for injecting a low-concentration fuel gas, and a fuel gas having a higher concentration than the fuel gas injected from the main flame hole that spreads in a long shape. In a combustion device having an auxiliary flame hole, a rich gas flow path that communicates with the auxiliary flame hole and has a large cross-sectional area for supplying fuel gas to the auxiliary flame hole, and a fuel gas in the rich gas flow path that opens to the rich gas flow path. And a concentrated gas supply path having a small cross-sectional area for supplying the concentrated gas supply path, the opening of the concentrated gas supply path to the concentrated gas flow path is off the center of the concentrated gas flow path, and Alternatively, the fuel gas is jetted toward the center of the rich gas passage.

According to the structure of the present invention, when the rich gas passage is formed below the elongated auxiliary flame hole, the opening of the rich gas supply passage is located at the end side of the auxiliary flame hole. It is located in a portion deviated from the center of the rich gas flow path such as below. Then, the opening direction of the concentrated gas supply passage in the form of a narrow passage having a small flow passage cross-sectional area and / or the injection direction of the fuel gas is directed toward the center side of the void-shaped rich gas passage having a large flow passage cross-sectional area.

Therefore, the rich gas injected from the narrow gas supply passage having the narrow passage shape into the void-like rich gas passage diffuses while flowing toward the center side of the rich gas passage and is ejected from the auxiliary flame hole. To do. This reduces the mutual difference in the amount of rich gas ejected from each part of the long auxiliary flame hole and reduces the imbalance, compared to the case of ejecting rich gas toward the end of the rich gas flow path. To be done. Further, the difference in the time required from the ejection of the rich gas from the rich gas supply passage to the ejection of the rich gas from each part of the auxiliary flame hole is also reduced. With this, in case of ignition,
A stable supplementary flame can be quickly formed over the entire length of the auxiliary flame hole, the ignitability and the supplementary flame are improved, and the emission of unburned gas is reduced. Further, since the rich gas is evenly ejected from the auxiliary flame hole, the generation of noise due to combustion is reduced.

Depending on the shape of the opening or the shape of the supply path, the rich gas supply path may or may not be in the same direction as the opening direction of the fuel gas. Therefore, when the opening direction and the jetting direction are the same, either one should be directed toward the center side of the rich gas channel, and when the opening direction and the jetting direction are different, the jetting direction should be the center of the rich gas channel. Turn to the side. Further, the main flame hole may have an appropriate shape as long as it can be supplemented by the auxiliary flame hole.

Further, according to the combustion apparatus of the present invention, the concentrated gas can be evenly ejected over the entire length of the elongated auxiliary flame hole, so that any part of the auxiliary flame hole can be ignited. It is possible. Especially, if the ignition is performed on the side farthest from the rich gas supply path (the inner side of the combustion device), the flame is not easily ignited by the air flow introduced into the combustion device, and smooth ignition, transfer and extinction are possible. Is. As a result, the generation of unburned components can be suppressed, and the occurrence of oscillatory combustion that tends to occur during the transitional transition period of the combustion state can be prevented.

According to a second aspect of the present invention, a main flame hole for injecting a low-concentration fuel gas and a fuel gas having a higher concentration than the fuel gas injected from the main flame hole that extends in a long shape are injected. In a combustion device having an auxiliary flame hole, a rich gas flow path that communicates with the auxiliary flame hole and has a large cross-sectional area for supplying fuel gas to the auxiliary flame hole, and a fuel gas in the rich gas flow path that opens to the rich gas flow path. And a rich gas supply passage having a small cross-sectional area for supplying the gas, and a baffle member provided on an extension of the rich gas supply passage.

The rich gas supply passage has a small flow passage cross-sectional area. That is, it is a narrow passage-like supply passage. When the baffle member is provided on the extension, the fuel gas ejected from the rich gas supply passage collides with the baffle member and the flow direction is deflected. Therefore, by appropriately disposing the baffle member, the fuel gas injected from the rich gas supply passage in the predetermined direction can be deflected and flow toward the center side of the rich gas passage. As a result, similarly to the present invention described in claim 1, the concentrated gas can be ejected uniformly over the entire length of the elongated auxiliary flame hole, and the difference in the time required until ejection can be reduced.

The baffle member may have an appropriate shape. For example, various shapes such as a flat plate shape, a bent plate shape, a tube shape, or a shape in which an opening is provided in the plate body can be adopted depending on the direction in which the fuel gas is to be deflected. Further, only one baffle member may be provided, or a plurality of baffle members may be provided. INDUSTRIAL APPLICABILITY The present invention is effective when there are structural restrictions on the shape of the rich gas supply passage or the location where it is arranged. In other words, if the opening direction or fuel gas ejection direction cannot be set to the target direction due to structural restrictions on the rich gas supply path, or
This is effective when the rich gas supply passage cannot be arranged at a desired position due to the structural limitation of the combustion device, and the design is easy. Also in the present invention, the main flame hole may have an appropriate shape if it can be supplemented by the auxiliary flame hole. Further, it is also possible to ignite the inside of the combustion device.

According to a third aspect of the present invention, a main flame hole for injecting a low-concentration fuel gas and a fuel gas having a concentration higher than that of the fuel gas injected from the main flame hole and extending in a long shape are injected. In a combustion device having an auxiliary flame hole, a rich gas channel communicating with the auxiliary flame hole and having a large cross-sectional area for supplying a fuel gas to the auxiliary flame hole, and a fuel opening in the rich gas channel and opening in the rich gas channel. A rich gas supply passage having a small cross-sectional area for supplying gas is provided, and a plurality of weir portions are provided in the rich gas flow passage, and an inter-weir portion flow passage is formed between the weir portions. In this configuration, the extension line of the supply path and the flow path between the weirs are displaced.

According to the structure of the present invention, since the extension line of the rich gas supply passage and the flow path between the weir portions are deviated, the fuel gas ejected from the rich gas supply passage collides with the weir portion once. Then, the fuel gas that collides with the weir portion is reduced in flow velocity, flows along the weir portion, diffuses, flows into the inter-weir portion flow path, and is ejected from the auxiliary flame hole. That is, the fuel gas ejected from the rich gas supply passage in a predetermined direction is once flowed into the inter-weir flow passage after the flow velocity is reduced by the weir portion to deflect the flow direction. Therefore, the amount of rich gas flowing into the flow path between the weir portions is equalized, the rich gas can be uniformly ejected from the elongated auxiliary flame holes, and the difference in time required until ejection is reduced.
Further, in the present invention, since the extension line of the rich gas supply path and the flow path between the weir portions are offset from each other, the concentrated gas injected from the rich gas supply path is concentrated in a specific flow path between the weir portions. There is no risk of inflow.

Further, according to the structure of the present invention, the flow path between the weir portions is a narrowed portion having a small flow passage cross-sectional area with respect to the rich gas flow passage and the auxiliary flame hole. Therefore, there is an effect that the mixing of the rich gas is promoted by passing through the flow path between the weir portions. Also in the present invention,
The shape of the main flame hole is arbitrary as long as it can be supplemented by the auxiliary flame hole.

Here, it is possible to construct a combustion apparatus that employs a similar configuration, although it is different from the configuration of the present invention.
That is, in a combustion device including a main flame hole for injecting a low-concentration fuel gas, and an auxiliary flame hole for expanding a fuel gas having a higher concentration than the fuel gas injected from the main flame hole , A rich gas channel communicating with the auxiliary flame hole and having a large cross-sectional area for supplying the fuel gas to the auxiliary flame hole, and a rich gas having a small cross-sectional area opening to the rich gas channel and supplying the fuel gas to the rich gas channel. And a plurality of weirs are provided in the rich gas passage, and inter-weir passages are formed between the weirs, and the cross-sectional areas of the inter-weir passages are made different. The configuration can be adopted.

Here, in the flow passage having a large cross-sectional area, the flow passage resistance is small and the fuel gas easily flows in. On the contrary, in the flow passage having the small cross-sectional area, the flow passage resistance is large and the fuel gas is difficult to flow in. Therefore, even when the rich gas is injected toward the flow path between the weir portions having a small cross-sectional area, the rich gas can be evenly flowed into the flow path between the weir portions having a large cross-sectional area. Therefore, by appropriately setting the cross-sectional area of each inter-weir channel according to the arrangement of each inter-weir channel with respect to the rich gas supply channel, the fuel gas ejected from the rich gas supply channel in a predetermined direction is ejected. Can be evenly divided into the flow paths between the weir portions according to the flow path resistance. As a result, the rich gas can be evenly ejected from the auxiliary flame hole, and the difference in the time required until ejection is reduced.

According to a fourth aspect of the present invention, in the combustion apparatus according to any one of the first to third aspects, an air inlet for introducing air or low concentration fuel gas, and air and high concentration fuel are introduced. A rich gas inlet for introducing gas, a light gas passage for communicating the air inlet and the main flame hole to supply fuel gas to the main flame hole, and a rich gas inlet for mixing the fuel gas and air And a mixing part for supplying a part of the high-concentration fuel gas adjusted in the mixing part to the fresh gas flow path, and supplying another part of the high-concentration fuel gas adjusted in the mixing part to a rich gas It is configured to supply the concentrated gas to the concentrated gas flow path through the supply path.

According to the present invention, the air and the fuel gas introduced from the rich gas inlet are mixed in the mixing section and then branched into the light gas flow path side and the rich gas supply path side. As a result, the concentration ratio of the light gas ejected from the main flame holes and the rich gas ejected from the auxiliary flame holes is stabilized, and stable combustion without flame unevenness can be performed. Further, in the case of adopting the configuration in which only the air is introduced from the air introduction port, only the fuel gas nozzle for injecting the fuel gas needs to be provided in the rich gas introduction port, and the structure is simplified.

The present invention according to claim 5 has a main flame hole which spreads in a long shape and injects a low concentration fuel gas, and a fuel gas which spreads in a long shape and is injected from the main flame hole has a higher concentration. In a combustion device having an auxiliary flame hole for injecting fuel gas, an air inlet for introducing air or low-concentration fuel gas,
A rich gas inlet for introducing air and high-concentration fuel gas, a light gas passage for connecting the air inlet and the main flame hole to supply fuel gas to the main flame hole, and a fuel for communicating with the rich gas inlet It has a mixing section for mixing gas and air, supplies a part of the high-concentration fuel gas adjusted in the mixing section to the fresh gas flow path, and further supplies the high-concentration fuel gas adjusted in the mixing section. It is configured to include a rich gas supply passage for supplying the other part to the rich gas passage.

According to the present invention, the air and the fuel gas introduced from the rich gas inlet are mixed in the mixing section, and then branched into the light gas flow passage side and the rich gas supply passage side. This allows
The concentration ratio between the light gas ejected from the main flame hole and the rich gas ejected from the auxiliary flame hole becomes stable. Further, in the case of adopting the configuration in which only the air is introduced from the air introduction port, only the fuel gas nozzle for injecting the fuel gas needs to be provided in the rich gas introduction port, and the structure is simplified.

The present invention according to claim 6 is the combustion apparatus according to claim 5, wherein another part of the high-concentration fuel gas is short-circuited to the rich gas passage by the rich gas supply passage. It is a configuration that is done. According to the configuration of the present invention, the high-concentration fuel gas adjusted in the mixing section is branched into the rich gas supply passage side and the light gas passage side. Then, the rich gas branched to the rich gas supply path side short-circuits the fuel gas to the rich gas flow path.
Therefore, the rich gas can be ejected from the auxiliary flame hole before the light gas is ejected from the main flame hole, the ignitability and the flame-retarding property are improved, and the generation of unburned components is suppressed.

The present invention according to claim 7 has a main flame hole which spreads in a long shape and injects a low concentration fuel gas, and a fuel gas which spreads in a long shape and is injected from the main flame hole has a higher concentration. In a combustion device having an auxiliary flame hole for injecting fuel gas, an air inlet for introducing air or low-concentration fuel gas,
A rich gas inlet for introducing air and a high-concentration fuel gas, a light gas flow path that connects the air inlet and the main flame hole and passes the curved path to supply the fuel gas to the main flame hole, and the rich gas It has a mixing part that communicates with the inlet and mixes the fuel gas and air, and supplies a part of the high-concentration fuel gas adjusted in the mixing part to the fresh gas passage, and further adjusted in the mixing part. This is a configuration including a rich gas supply path that short-circuits the other part of the high-concentration fuel gas to the rich gas flow path.

According to the structure of the present invention, the high-concentration fuel gas adjusted in the mixing section is branched into the rich gas supply passage side and the light gas passage side. Then, the rich gas branched to the rich gas supply path side is short-circuited to the rich gas flow path and ejected from the auxiliary flame hole. On the other hand, the rich gas branched to the light gas flow path side is mixed with the air introduced from the air introduction port or the low-concentration fuel gas while passing through the curved path and ejected from the main flame hole. Therefore, the rich gas can be ejected and stabilized from the auxiliary flame hole faster than the light gas is ejected from the main flame hole, and the ignitability and the flame-retarding property can be improved. Also, the generation of unburned components is small.

According to an eighth aspect of the present invention, in the combustion device according to any one of the fifth to seventh aspects, a plurality of plates are stacked to form a rich gas passage and a light gas passage, The gas flow passage is provided on both sides of the light gas flow passage. According to the present invention, for example, a plurality of plate bodies that have been previously subjected to processing such as press molding are overlapped with each other, and a gap between the plate bodies is used to form a rich gas passage and a light gas passage. be able to. That is, for example, in the case of a structure in which four plate bodies are stacked, a light gas flow path is formed by a gap formed between the two plate bodies arranged in the center and is arranged outside. The rich gas flow path can be formed by the gap formed between the inner surface of the plate body and the outer surface of the central plate body.

In particular, according to the present invention, the rich gas passage is provided on both sides of the light gas passage. Therefore, if the auxiliary flame holes are arranged on both sides along the elongated main flame hole, it is not necessary to intersect the rich gas flow path and the light gas flow path in the middle of the flow path, and the structure is simplified. Being designed is easy. Further, according to this structure, the gas introduction port, the gas flow path, or the flame hole can be formed by the gap between the stacked plate bodies, and the manufacturing is easy and the cost can be saved.

[0031]

EXAMPLES Specific examples of the present invention will be described below. In the following description, the upper and lower sides are based on the state in which the combustion device 1 is installed with the flame holes facing upward.

FIG. 1 is a perspective view of a combustion apparatus 1 according to a specific embodiment of the present invention. FIG. 2 is an exploded perspective view of the combustion device 1 of FIG. FIG. 3 is a plan view of the combustion device 1 of FIG. 1 and an enlarged view thereof. FIG. 4 is a development view of the combustion device 1 of FIG. FIG. 5: is explanatory drawing which shows the folding structure of the board of FIG. FIG. 6 is an explanatory diagram showing the flow of the fuel gas on the rich gas flow path side in the combustion apparatus 1 of FIG. Figure 7
FIG. 3 is an explanatory diagram showing a flow of fuel gas on the side of a fresh gas flow path in the combustion device 1 of FIG. 1. 8 is a sectional view taken along the line AA of FIG. 9 is a sectional view taken along the line BB of FIG. 1 and C.
FIG. 6 is a cross-sectional view taken along the arrow C. FIG. 10 is a perspective view taken in the direction of the arrow D in FIG. 1. FIG. 11 is a view on arrow D in FIG. 1. 12 is a perspective view showing the flow of fuel gas around the mixing portion of the combustion device 1 of FIG.

The combustion apparatus 1 of the present embodiment is used in parallel in a case as in the conventional combustion apparatus, or is used alone. The combustion device 1 of the present embodiment is
It is composed of the burner body 10 and the flame hole member 13. The burner body 10 is composed of a central main body 20 and sub-side bodies 12 on both sides, and as shown in FIGS. 1, 2, 4, and 10, four metal plate members 15, 16, 17, It is made by stacking 18 layers. These metal plates 15, 1
Nos. 6, 17 and 18 each have a flat plate provided with a concavo-convex shape by press molding, and a flow path for air or fuel gas is formed between the plate bodies. These metal plate members 15, 16, 17, and 18 may be press-molded one by one and stacked, but in this embodiment, the sub-structure 12 is used.
The plate bodies 15 and 18 forming the main body 20 are formed of an integrated metal plate body, and the plate bodies 16 and 17 forming the main constituent body 20 are formed of different metal plate bodies.

That is, in this embodiment, as shown in FIG. 4, two press-formed metal plate bodies forming the plate bodies 16 and 17 and one plate are divided into two sections, and a part A ( A metal plate body press-molded to have the shape of the plate body 15) and the portion B (plate body 18) is used. Then, as shown in FIG. 5, these are placed on the part A (plate 15) and the part B (plate 18) on the plate 16,
By overlapping 17 and folding the center of parts A and B,
A structure in which metal plate members 15, 16, 17, and 18 are stacked is formed. As a work procedure, first, the plates 16 and 1
7 is superposed on the site A (plate 15) and the site B (plate 18), and in this state, the plate 16 and the site A (plate 15) and the plate 17 and the site B (plate 18) are spotted. Join by welding. Finally, the intermediate portion between the parts A and B is folded, and the periphery is spot-welded.

The structure will be described below with reference to the stacked state. In the combustion apparatus 1 of the present embodiment, as shown in FIG. 2, the two central plates 16 and 17 are symmetrical (palm) -shaped, and the two are overlapped with each other to form the main constituent body 20. That is, the main constituent body 20 has a shape in which a plate body 17 serving as a front plate and a plate body 16 serving as a symmetrical (palm) -shaped back plate are superposed on each other. The outer appearance of the main structure 20 is flat and the top 21 is open. Also top 2
Flange portions 20a are provided on the three sides except for one. However, a mixing promoting member 60 formed by cutting out a part of the flange portion 20a is provided on the upper portion on the air introducing port 27 side.

The mixing promoting member 60 is shown in FIGS.
1, the end portion of the flange portion 20a is cut out in a substantially semicircular shape. In other words, the flange 20a is cut out to the right in the horizontal direction with a predetermined width and further cut out in a semicircular shape, and the semicircular side edges of the cutout 60a are cut and raised so as to be separated from each other (burring). The cut and raised portion 60b is formed by processing.

A communication hole 37 is formed in the upper portion of the air inlet 27 and adjacent to the downstream side of the mixing promotion member 60.
Is provided. As shown in FIGS. 2 and 10, the communication hole 37 is formed by combining an opening that extends toward the upstream side of the mixing promotion member 60 and an opening that extends obliquely upward and is substantially L-shaped.
It has an opening shape bent into a letter shape. The opening extending toward the mixing promoting member 60 side is directed toward the upstream side along the inclined side of the dense gas flow path forming bulging portion formed in the plate body 18 described later and the upper outer wall of the air introduction port 27. It has an enlarged opening shape. Further, the width of the opening extending obliquely upward is approximately the same as the inner diameter of the rich gas supply passage (narrowing passage) described later, and has an opening shape having a length extending to substantially the center of the rich gas supply passage. The communication hole 37 communicates the plate bodies 16 and 17 to equalize the pressure of the mixed gas, and is located inside the mixing section described later.

An intermediate wall 38 is formed around the mixing promotion member 60 and the communication hole 37. That is, the air inlet 27
The mixing promotion member 60 and the communication hole 37 are provided in the upper part of the, and the mixing portion 48 is formed by the void around the mixing promotion member 60 and the communication hole 37.

The two plate members 16 constituting the main structure 20,
In the inside of 17, by the two plate bodies 16 and 17,
As shown in FIG. 2, a series of gas flow paths are formed. That is, a gap is formed in a portion other than the portion where the plates 16 and 17 are in close contact with each other, and the gap forms a gas flow path 28. In the combustion apparatus 1 of the present embodiment, the fuel gas having a low concentration passes through the gas flow path 28 of the main constituent body 20 constituted by the plates 16 and 17. That is, the gas flow path 28 formed in the main structure 20 functions as a fresh gas flow path.

In the main structure 20 employed in this embodiment, the fresh gas flow passage 28 is roughly divided into a venturi portion 22, a fresh gas mixing portion 23, a conducting portion 24, and a flame hole member disposing portion 25.
Consists of. That is, the fresh gas flow path 28 starts from the air introduction port 27, and sequentially proceeds to the venturi section 22 and the fresh gas mixing section 2
3, the conducting portion 24 and the flame hole member disposing portion 25. These shapes will be described below from the inlet of the fresh gas flow channel 28. That is, the air inlet 27 is opened at the lower corner of the main structure 20, as shown in FIGS. The air inlet 27 has a substantially elliptical shape.

On the back side of the air introduction port 27, a portion having the same cross section as the end surface of the air introduction port 27 is connected by a predetermined length, and there is a taper 22a at a position slightly entering from the air introduction port 27,
The venturi portion 22 is formed by narrowing the width in a taper shape. Further, the taper 22b is provided also on the downstream side of the venturi portion 22.
Is provided, and the taper 22b causes the fresh gas flow path 28
The width of is gradually expanding. That is, as shown in FIG. 12, the venturi portion 22 is a portion in which the flow path is narrowed inward by the tapers 22a and 22b and the cross-sectional area is sharply reduced.

In this embodiment, as shown in FIG.
a is arranged so as to be inclined forward with respect to the air inlet 27, and has a taper 2
2b is arranged in a substantially vertical direction. As a result, the venturi portion 22 has a substantially triangular shape that expands upward.
There are two reasons why the venturi portion 22 is formed into a substantially triangular shape. The first reason is that a substantially rectangular venturi portion 22 is formed by vertically arranging the taper 22a without tilting it forward, and the gas introduction hole 31 is formed on the entire surface of the venturi portion 22.
This is because even if the above is arranged, almost no rich gas flows from the gas introduction hole 31 located on the lower side of the upstream side. Also,

The second reason is that in the combustion apparatus 1 of the present embodiment, as will be described later, in order to promote the mixing and equalization of the air and the fuel gas introduced from the rich gas introduction port 43,
This is because the channel cross-sectional area of the mixing section 48 is reduced toward the downstream side and then expanded again. This is because the taper 22a is tilted forward to form an enlarged portion of the flow passage cross-sectional area of the mixing portion 48 by utilizing the gap that is enlarged from the taper 22a to the venturi portion 22.

The height of the flow path in the venturi portion 22 is gradually increased toward the downstream side, and the cross-sectional area is gradually increased toward the back. Then, the cross-sectional area of the fresh gas flow passage 28 of the venturi portion 22 is constant when the total height of the flow passage reaches a certain height. Further, in this embodiment, the parts forming the venturi part 22 of the plates 16 and 17 are parallel to each other as shown in FIG.

In the combustion apparatus of this embodiment, the venturi section 2
Since 2 is a substantially triangular flat surface as described above, a plurality of gas introduction holes 31 can be provided as shown in FIG. Specifically, in this embodiment, six gas introduction holes 3 are arranged in a staggered pattern.
1 is provided, and the diameter of each introduction hole 31 is made different depending on the arrangement site. This is for injecting an equal amount of concentrated gas into the flow passage cross section of the light gas flow passage 28, and the negative pressure level generated by the air flowing through the venturi portion 22 and the gas introduction holes 31 arranged in the air flow direction. The inner diameter of the gas introduction hole 31 is changed according to the number of The gas introduction holes 31 are preferably arranged in a zigzag pattern as in the present embodiment, but may be provided in a horizontal line or a vertical line. Although not recommended, the number of gas introduction holes 31 may be as small as one or two.

As described above, the tapered portion 22b is also provided on the downstream side of the venturi portion 22, and the width of the fresh gas flow passage 28 is gradually widened by the tapered portion 22b. Then, as shown in FIG. 2, the light gas flow path 28 is largely changed in direction to form the light gas mixing portion 23. Light gas mixing section 23
Is a portion where the air flow path is greatly curved, and is a large curved path. The end of the light gas mixing section 23 is at the center of the main constituent body 20, and the part from the end to the tip is narrowed again and connected to the conducting section 24. The conducting portion 24 has a width of about ½ of the above-mentioned light gas mixing portion 23, and extends in a triangular shape including the end of the light gas mixing portion 23.

The conducting portion 24 connects the end of the fresh gas mixing portion 23 and the flame hole member disposing portion 25, is continuous with the end of the fresh gas mixing portion 23, and is an air inlet 27 of the main structure 20.
It extends from the side over a length of about 1/3.

The flame hole member arranging portion 25 is located at the upper end portion of the main constituent body 20 and extends over the entire longitudinal direction. A groove 25a is provided in the longitudinal direction on the side surface of the flame hole member placement portion 25. The groove 25 a has a convex shape toward the outside of the flame hole member placement portion 25 and extends over the entire area of the flame hole member placement portion 25 in the longitudinal direction. The groove 25a is provided for the purpose of increasing the rigidity of the flame hole member arrangement portion 25 and for promoting the stirring of the fuel gas and the air.

On the other hand, as shown in FIG. 2, the plate members 15 and 18 which are arranged on the side surface side of the main constituent member 20 and constitute the sub constituent member 12,
Similar to the plates 16 and 17 described above, a steel plate is press-molded to provide irregularities. The plates 15 and 18 are symmetrical (palm) with each other, and each has a concave overall shape, and flange portions 15a and 18a are provided at both ends and a lower portion in the longitudinal direction. However, the air inlet 27 described above
Is located at the flange portions 15a and 18a.
Is missing.

In these plate bodies 15 and 18, the portion corresponding to the light gas mixing portion 23 of the main constituent body 20 is recessed inward as compared with the other portions. The concave portions 15b and 18
The shape of b is substantially the same as the outer shape of the light gas mixing section 23. And the upper part of the said recessed part 18b is expanded again outside. That is, the upper end 18c of the recess 18b has the plate members 15, 1
It is parallel to the upper and lower sides of 8 and occupies about 1/3 of the total length of the plates 15 and 18 from the back side with respect to the air introduction port 27. A portion above the upper end 18c of the concave portion 18b is a concentrated gas flow path forming bulge portion 18d. Also,
The side of the dense gas flow path forming bulging portion 18d on the air introduction port 27 side is an inclined side 18e. The dense gas flow path forming bulging portion 18d and the portion in the vicinity of the air introduction port 27 are communicated with each other by an inclined groove 40 as described later.

Above the plates 15 and 18, as shown in FIG.
A groove-shaped dam portion 18f and a circular concave portion 18g are provided. The groove-like weir portion 18f is divided into eight portions and extends in a line over the entire area of the plate bodies 15 and 18 in the longitudinal direction. On the other hand, the circular concave portion 18g is provided above the inter-weir channel 18h formed between the groove-like weir portions 18f. Both the dam portion 18f and the recessed portion 18g are recessed toward the inside of the burner body 10, and both promote stirring of the fuel gas and air. However, the circular recess 18g also functions as a weld when the burner body 10 is assembled.

Next, the flame hole member 13 will be described. As shown in FIG. 3, the flame hole member 13 used in the present embodiment is formed by stacking strip-shaped plates having irregularities, and has a quadrangular prism shape as a whole. The flame hole member 13 communicates with the top and bottom of the drawing by the gap between the irregularities. And flame hole member 1
The opening at the upper end of 3 functions as a main flame hole. Flame member 1
3 is inserted into the flame hole member placement portion 25 of the main constituent body 20.

Next, the relationship between the members of the combustion apparatus 1 of this embodiment will be described. In the combustion device 1 of this embodiment,
As shown in FIG. 2, with the main constituent body 20 made of the plate bodies 16 and 17 as the center, the plate bodies 15 and 18 are arranged on the left and right sides of the main constituent body 20 to form the sub-structure body 12. Main constituent 20
And the plate members 15 and 18 have flange portions 20a and 15
a and 18a are overlapped and joined. The joining structure by spot welding is adopted for these joining.
Joining by spot welding is performed between the central plates 16 and 17 forming the main structure 20 and the side plates 15 and 18 forming the sub structure 12. That is, one plate body 16 at the center and the plate body 15 at the side surface portion adjacent to the plate body 16 are welded to each other, and the other plate body 17 at the center is welded.
The welding is also performed between the plate bodies 18 on the side surface portions adjacent thereto.

The central plate member 16 which constitutes the main structure 20,
17 and the plate members 15 and 1 of the side surface portion constituting the sub-structure 12.
The welding joint between the plate body 15 and
It is carried out in circular concave portions 15g and 18g provided on the upper portion of 18. The circular concave portions 15g and 18g are portions near the main flame hole and the auxiliary flame hole. In this manner, the reason why the central plate bodies 16 and 17 and the side surface plate bodies 15 and 18 forming the sub-structure 12 are joined at the portions near the main flame holes and the auxiliary flame holes is This is because they are easily exposed to high temperatures and easily deformed.

Therefore, it is desirable to carry out the joining by welding at a site as close to the flame hole as possible, and it is recommended that the site be the side surface of the flame hole member. Further, in this embodiment, since the welding is performed at the portions of the circular concave portions 15g and 18g, the inside of the circular concave portions 15g and 18g (the relevant portion is a protrusion when viewed from the inside) is shown in FIG.
As described above, a gap is secured between the side surface of the main constituent body 20 and the side surface of the main constituent body 20 and the portions other than the concave portions 15g, 18g of the plate members 15, 18.

Looking at the internal joint relationship between the main constituent 20 and the plates 15 and 18, as shown in FIGS. 2 and 10, the main constituent 20 and the side plates 15 and 18 are The vicinity of the air inlet 27 at the lower end is in contact with the vicinity of the fresh gas mixing portion 23 and the intermediate wall portion 38, and the other portions are separated. That is, in the vicinity of the air inlet 27 at the lower end, as shown in FIGS.
Sides 27a, 27b of the air inlet 27 of the main structure 20
Then, the bottom surfaces 27c and 27d are in contact with the plate bodies 15 and 18 on the side surface side, and there is no gap in the portion.

However, the openings 46 of the plate bodies 15 and 18 as the sub-structure 12 are larger than the air introduction port 27, and the upper portion of the air introduction port 27 is not in contact with the openings 46 of the plate bodies 15 and 18. Therefore, the lower end of the burner body 10 has a double-structured opening, and the outer wall of the upper part of the air inlet 27 of the main structure 20 and the sub-structure 12 are located above the air inlet 27 of the main structure 20. There are openings formed inside the openings 46 of the barrel plates 15 and 18. Then, the opening functions as the rich gas introduction port 43.

Regarding the upper part of the air inlet 27, the plate 1
6 and 17 are partially omitted, and the rich gas introduction port 43 is open. In addition, a mixing promoting member 60 and a communication hole 37 are provided in the main constituent body 20 of the relevant portion. Therefore, there is a relatively wide void 30 above the air inlet 27,
It is open to the outside. Then, the mixing portion 4 is formed by the space 30 and the space 33 around the venturi portion 22 described above.
8 forming.

As described above, in this embodiment, the opening has a double structure, and the upper portion of the air introduction port 27 directly functions as a part of the wall of the rich gas introduction port 43, thus wasting space. The total height of the combustion device can be reduced. Further, in this embodiment, since the rich gas introduction port 43 is on the air introduction port 27, the rich gas introduction port 43 is located near the main flame hole 36 and the auxiliary flame holes 29a and 29b, and the air introduction port 27 is It is located far from the main and auxiliary flame holes.

As shown in FIGS. 2 and 10, a gap 3 is formed between the periphery of the venturi portion 22 of the main structure 20 and the space between the sub structures 12.
3 is formed. The periphery of the venturi portion 22 is separated from the sub structure 12 on three sides except for the bottom portion, and the periphery of the venturi portion 22 is surrounded by the void 33.

Further, the main constituent 20 and the concentrated gas flow path forming bulging portion 18d of the sub constituent 12 are also separated from each other, and a void 45 is formed as shown in FIG. However, since the conducting portion 24 of the main structure 20 is narrower than other portions, the conducting portion 24
The side surface of is wider than other parts. The voids 45 are located on both side surfaces of the fresh gas flow channel 28 and extend over the entire length of the main constituent body 20.

Between the space 33 formed on the lower side surface of the main structure 20 and the space 45 formed on the upper side,
As shown in FIGS. 9B and 12, the intermediate wall portion 38 of the main constituent body 20.
And the inner surface of the sub-structure 12 are in contact with each other and there is no gap, and the upper and lower voids 33 and 45 are shielded. However, as shown in FIG. 9B, the upper and lower voids 33 and 45 are communicated with each other only by the groove 40 of the sub-structure 12. That is, the dense gas flow path forming bulging portion 18d of the sub-structure 12 and the air introduction port 27.
A groove 40 is formed in the vicinity of the groove 40, and the groove 40 allows the rich gas flow path forming bulging portion 18d and the rich gas inlet 43 to be formed.
Are in communication. On the other hand, since the intermediate wall portion 38 is a flat plate, the narrow passage 47 is formed between both sides of the intermediate wall portion 38 and the grooves 40 of the plate bodies 15 and 18.

Here, the details of the narrow passage 47 will be described. As shown in FIGS. 6B and 10, the narrow passage 47 is located near the communication hole 37 of the intermediate wall portion 38. Further, the boundary line of the bulging portions of the plate members 15 and 18 near the communication hole 37 is
It intersects with an opening portion extending obliquely upward of the communication hole 37. Therefore, as shown in FIG. 10, the narrow passage 47 that connects the upper space 45 and the lower space 33 has the communication hole 37 of the intermediate wall portion 38.
The portion corresponding to is integrated and is divided into the left and right by the intermediate wall portion 38 reaching the intermediate portion of the narrowed passage 47.

Therefore, the main structure 20 and the plates 15 and 18
A series of gas flow paths connecting the lower void 33 and the upper void 45 via a narrowed passage 47 are formed between
All of these gas flow paths are open to the top surface.
The open surface functions as auxiliary flame holes 29a and 29b. That is, the main flame hole 36 is linear, and the auxiliary flame holes 29a and 29b formed by the sub-structure 12 are the main flame holes 3
6 on both sides of the main flame hole 36. Further, in the combustion apparatus 1 of the present embodiment, the voids 45 communicating with the auxiliary flame holes 29a and 29b function as rich gas flow paths 35a and 35b,
The narrow passage 47 connecting the void 45 and the lower void 33 functions as a rich gas supply passage. That is, the void 33 that is a part of the mixing section 48 and the void 4 that forms the rich gas flow paths 35a and 35b.
5 are connected by a rich gas supply path 47.

More specifically, there is a gap between the plate body 16 which constitutes the main constituent body 20 and the plate body 15 adjacent to the plate body 16. This gap extends from the vicinity of the lower end of both to the upper part of the rich gas supply passage 47. Through the. The lower gap functions as the mixing section 48, and the upper gap functions as the rich gas flow path 35a. On the other hand, there is also a gap between the plate body 17 that constitutes the main constituent body 20 and the plate body 18 adjacent to the plate body 17, and this gap is communicated through the rich gas supply passage 47 from the vicinity of the lower ends of both to the upper part. There is. The lower gap functions as the mixing section 48, and the upper gap functions as the rich gas flow path 35b. The upper portion of each of the rich gas flow paths 35a and 35b is opened, and the auxiliary flame holes 29a and 2b
9b is formed.

In the combustion apparatus 1 of this embodiment, as described above, the rich gas supply passage (narrowing passage) 47 is bridged between the gap 33 of the mixing portion 48 and the gap 45 of the rich gas flow passages 35a and 35b. Is provided for ejecting the rich gas to the rich gas flow paths 35a and 35b. That is, the narrowed passage 47
Other than that, there is no flow path connecting the gap 33 and the gap 45, and all the rich gas supplied from the mixing section 48 is ejected from the auxiliary flame holes 29a, 29b through the rich gas supply passage 47.

Here, the rich gas supply path 47 and the auxiliary flame hole 29
Focusing on the arrangement of a and 29b, as shown in FIGS. 6A and 6B, the rich gas supply passage 47 is located below the air inlet 27 side of the auxiliary flame holes 29a and 29b extending in the longitudinal direction. Therefore, the flow path 18h between the weir parts closest to the rich gas supply path 47 is
There is a considerable difference in the flow path length between the farthest weir flow path 18h. Further, the rich gas supply passage 47 has an extremely small flow passage cross-sectional area as compared with the void (rich gas passage) 45. That is, the rich gas ejected from the rich gas supply passage 47 having a very small flow passage cross-sectional area is evenly distributed over the entire length of the auxiliary flame holes 29a and 29b spreading in the longitudinal direction through the gap (rich gas passage) 45. Have to spread around.

Therefore, in the combustion apparatus 1 of this embodiment, as shown in FIG.
As shown in (b), the fuel gas is discharged toward the auxiliary flame holes 29a, 29b away from the rich gas supply passage 47,
It has a structure in which the rich gas supply path 47 is slightly inclined toward the back of the combustion device 1. At the same time, the extension line of the rich gas supply path is arranged so as not to be close to the upstream side inlet of the specific weir flow path 18h.

By adopting such a structure, the rich gas flowing out from the rich gas supply passage 47 is concentrated in the rich gas supply passage 47.
It is possible to sufficiently spread to the side of the inter-weir flow path 18h away from, and moreover, a large amount of fuel gas does not flow into the specific inter-weir flow path 18h. As a result, the rich gas flowing out of the rich gas supply passage 47 is evenly supplied to the inter-weir flow path 18h, and the fuel gas can be ejected from the auxiliary flame holes 29a and 29b substantially simultaneously.

On the side surface of the burner body 10, more specifically, on the upper portion of the air inlet 27, there is a relatively wide void portion 30 which functions as a part of the mixing portion 48 as shown in FIG. Has been done. In addition, the venturi portion 2 of the main structure 20
2 is narrower than the other parts, so the venturi part 2
There is a relatively large space 33 between the plate 2 and the plates 15 and 18 on both sides, as shown in FIG. The voids 30 and the voids 33 function as a mixing unit 48 for mixing the fuel gas and the air, while the voids 33 branch the fuel gas mixed in the mixing unit 48 to the fresh gas flow passage 28. It also has the function as.

In the combustion apparatus 1 of this embodiment, a shape is adopted in which the flow passage cross-sectional area of the mixing section 48 is reduced toward the downstream side and then enlarged again. In other words, as shown in FIGS. 2 and 6, the plate bodies 15 and 18 are in contact with the intermediate wall portion 38 of the main constituent body 20, so that, as described above, the voids 30 and the voids 33 that form the mixing portion 48. Are shielded from the void 45 that forms the upper concentrated gas flow path. Then, the plates 15, 1
8 is the inclined side 18e of the dense gas flow path forming bulge 18d, and the lower side of the contacted portion is the inclined side 18i substantially parallel to the inclined side 18e. There is.
Therefore, the upper inner wall of the mixing portion 48 is formed to be inclined downward toward the downstream side along the inclined side 18i. On the other hand, the upper outer wall of the air introduction port 27 is formed so as to be inclined upward toward the downstream side, and is steeply inclined downward to reach the portion of the taper 22a.

As a result, as shown in FIGS. 6 and 10, the mixing portion 48 has a tapered shape in which the cross-sectional area of the flow passage is reduced from the rich gas introduction port 43 toward the downstream side, and mixing is promoted inside thereof. A member 60 is arranged. The taper 22a forming the venturi portion 22 when reaching the communication hole 37 on the downstream side.
Is connected to the void 33 whose channel cross-sectional area is rapidly expanded. That is, the mixing promoting member 60 from the rich gas inlet 43
The taper 22a becomes narrower as it goes down to the taper 22a, and the cross-sectional area of the flow path becomes the smallest at the portion where it crosses the taper 22a. ing.

Therefore, the fuel gas and the air introduced from the rich gas introduction port 43 are mixed by the mixing promoting member 60 while being separated into the right and left sides of the flow passage, and are mixed while increasing the flow velocity as the flow passage cross-sectional area is reduced. Toward the communication hole 37. During this time, the fuel gas and air are well mixed. Then, when passing through the portion where the flow passage cross-sectional area is the smallest, the flow passage cross-sectional area is rapidly expanded, the concentrated gas that is mixed while being separated into the left and right is reduced in flow velocity and is communicated through the communication hole 37 to cause a pressure difference. It is removed and pressure is equalized.

As a result, even if the position of the fuel gas nozzle 11 with respect to the rich gas introduction port 43 is slightly deviated in the vertical and horizontal directions, or even if there is an angular deviation, the fuel gas is sufficiently mixed. That is, even if the mounting position and angle of the fuel gas nozzle 11 with respect to the combustion device 1 change due to dimensional tolerances of members and variations during manufacturing, the fuel gas is sufficiently mixed and a stable flame can be obtained. Become.

Further, the ignition device 3 is an accessory of the combustion device 1.
4 are provided. The ignition device 34 has an auxiliary flame hole 29.
It is located in the vicinity of a and 29b and in the vicinity of the upper part on the side facing the site where the air inlet 27 is provided, that is, in the back of the combustion apparatus 1.

Next, the flow of fuel gas and air in the combustion apparatus 1 of this embodiment will be described. Combustion device 1 of the present embodiment
Then, as shown in FIG. 6, the fuel gas nozzle 11 is connected to the rich gas introduction port 43 above the air introduction port 27 of the burner body 10.
Is inserted. An air blower (not shown) is provided on the upstream side of the burner body 10, and air is supplied to both the rich gas introduction port 43 and the air introduction port 27. That is, the insertion state of the fuel gas nozzle 11 is similar to that of a normal Bunsen type combustion burner, and there is a gap or opening between the rich gas introduction port 43 and the fuel gas nozzle 11, and the rich gas introduction port 43 has fuel. Air is mixed with the gas. The mixing ratio of air to the fuel gas is about 40% of the theoretical air amount, and the fuel gas concentration is high. On the other hand, only air is introduced from the air introduction port 27.

The fuel gas that has entered through the rich gas inlet 43 is mixed with air in the mixing section 48.
Here, the mixing section 48 is a combination of the voids 30 and 33, and the mixing promoting member 6 provided inside the mixing section 48.
The fuel gas and air are forcibly mixed with each other due to zero and the reduction of the flow passage cross-sectional area to form a rich mixed gas.

That is, as shown in FIGS. 11 and 12, the air and the fuel gas introduced from the rich gas introduction port 43 move toward the mixing promoting member 60, and form a semicircle along the cut and raised portion 60b. The airflow is bent so that it converges into a shape. Then, the air and the fuel gas that collide due to the convergence are separated so as to escape to the left and right, and move to the communication hole 37 on the downstream side while increasing the flow velocity with the reduction of the flow passage cross-sectional area. When the fuel gas reaches the communication hole 37, the flow passage area is expanded by the void 33 to reduce the flow velocity, and the separated fuel gas is communicated with the communication hole 37 to remove the pressure difference of the fuel gas and equalize the pressure. It becomes a fuel gas that is fully mixed with the fuel gas.

In this way, the air and the fuel gas are sufficiently mixed in the mixing section 48, and a part of the rich gas passes through the rich gas supply passage 47 as shown in FIGS. It flows out into the void 45). At this time, as described above, since the rich gas supply passage 47 is inclined toward the inner side of the combustion device 1, the rich gas flowing out from the rich gas supply passage 47 is not separated into the void 45.
The inter-weir flow path 1 that spreads over the entire area of the
It is injected to the outside through auxiliary flame holes 29a and 29b on the upper side through 8h. That is, a part of the fuel gas flows upward along the side surfaces of the main constituent body 20 in the rich gas flow paths 35a and 35b as shown in FIG. 9, and the auxiliary flame holes 29a and 29b provided on both sides of the main constituent body 20. Is injected from the outside.

The mixed gas injected from the auxiliary flame holes 29a, 29b via the rich gas flow paths 35a, 35b contains only about 40% of the theoretical air amount as described above, and the fuel gas The concentration of is high. Further, in the combustion apparatus 1 of the present embodiment, after the air and the high-concentration fuel gas are sufficiently mixed by the reduction of the flow passage cross-sectional area in the mixing portion 48 and the mixing promotion member 60, the rich gas flow passage 35a, 35b
The narrow flow path (concentrated gas supply path 47) is caused to pass immediately before entering the space 45 on the upper side of the barrel, so that the mixing of the fuel gas and the air is further promoted.

Further, in the present embodiment, the rich gas supply passage 47 is common to the left and right by the communication hole 37 at the entrance portion, and is divided into the left and right by the intermediate wall portion 38 at the middle portion of the passage. Therefore, the opening cross-sectional areas of the left and right passages are determined only by the cross-sectional area of the middle portion of the rich gas supply passage 47. Here, the rich gas supply passage 47 is the groove 40 formed by press-forming the plate body, and the inside portion thereof and the intermediate portion have the highest forming accuracy. Further, in the present embodiment, the rich gas supply passage 47 provided in the plates 15 and 18 has the gap 45 as shown in FIG.
It is provided so as to bridge the space and the gap 33. Therefore, as shown in FIGS. 2 and 6, the plates 15 and 18 are in contact with the intermediate wall portion 38 of the main constituent body 20. The upper side of the contact portion between the plate members 15 and 18 and the intermediate wall portion 38 is the inclined side 18e of the dense gas flow path forming bulge portion 18d, and the lower side of the contact portion is the slope substantially parallel to the inclined side 18e. The side 18i is formed. In view of this, in the present embodiment, the rich gas supply passage 47 is provided so as to be substantially orthogonal to the inclined sides 18e, 18i, and the press molding accuracy of the rich gas supply passage 47 is further improved.

As a result, in the combustion apparatus 1 of this embodiment,
The rich gas mixed in the mixing unit 48 is evenly divided into the left and right rich gas supply passages 47, and the rich gas flow passages 35a and 35b.
In addition, since there is little variation in the inclination angle of the rich gas supply path 47 among the members, the outflow direction of the rich gas is stable and the left and right flames are well balanced. In particular, in the combustion apparatus 1 of the present embodiment, since the rich mixed gas having no mixing unevenness obtained in the mixing section 48 is sent to the rich gas supply passage 47, the left and right supplementary flames are well balanced, and as described above, Due to the inclined arrangement of the rich gas supply path 47, the fuel gas can be made to flow uniformly over the entire length of the auxiliary flame holes 29a, 29b, the ignitability and the flame-retarding property are improved, and a stable flame with no uneven combustion is produced. Obtainable.

Further, in the combustion apparatus 1 of the present embodiment, as described above, since the rich gas can be ejected substantially simultaneously and evenly over the entire length of the auxiliary flame holes 29a, 29b, the ignition is performed as shown in FIG. The device 34 is provided at the back of the combustion device 1. As a result, flames are less likely to be ignited by the airflow supplied to the combustion device 1, and smooth ignition, fire transfer, and fire extinguishing are possible, and the generation of unburned gas is reduced. Also,
It also has the effect of suppressing the occurrence of oscillating combustion that tends to occur during the transitional period of fluctuation of the combustion state due to smooth ignition and transition.

On the other hand, the remaining portion of the fuel gas sufficiently mixed in the mixing portion 48 (void portions 30, 33) reaches the vicinity of the venturi portion 22 as shown in FIG. 7, and the venturi portion which is a part of the fresh gas flow passage 28. It flows into the void 33 (branch portion) that surrounds 22. Then, the rest of the fuel gas enters the inside of the main constituent body 20 through the gas introduction hole 31 provided in the venturi portion 22. That is, the fuel gas enters the fresh gas passage 28 via the gas introduction hole 31.

Here, in the present embodiment, the gas introduction hole 31 is provided in a portion of the main structure 20 where the cross-sectional area is partially reduced. Therefore, the flow velocity is high in the relevant portion, and the inside tends to have a negative pressure. On the other hand, around the venturi portion 22,
It is surrounded by a part of the rich gas flow paths 35a and 35b, and the rich mixed gas sufficiently exists around the venturi portion 22. Therefore, the rich mixed gas around the venturi portion 22 is sucked by the negative pressure of the main constituent body 20, and the fuel gas rushes in the direction perpendicular to the flow of air and flows in the main constituent body (the light gas passage 28). Mixed with air. In the present embodiment, as described above, the inner diameter of the gas introduction hole 31 is changed according to the installation site, and a uniform amount of concentrated gas is made to flow into the cross section of the light gas flow path 28 and is supplied to the downstream side. It is configured to do. As a result, the concentration of the rich gas does not locally increase inside the light gas flow path 28, and the occurrence of uneven mixing is suppressed.

Further, the fuel gas is further promoted to be mixed in the largely bent light gas mixing portion 23, reaches the flame hole member arrangement portion 25 through the conducting portion 24, enters the flame hole member 13, and enters the main flame hole 36. It is injected outside.

In the combustion apparatus 1 of this embodiment, the fuel gas is
Each of the main flame holes 3 of the flame hole member 13 is traced along the above-mentioned paths.
A light mixed gas is injected from 6 and a rich mixed gas is injected from the auxiliary flame holes 29a and 29b located on the side surface. However, focusing on the distance to the two flame holes, there is a considerable difference between the two. That is, as shown in FIGS. 6 and 7, both fuel gas flow paths are common up to the above-described space 33 (branch portion). However, the rich gas inlet 43
Is closer to the main flame hole and the auxiliary flame hole than the air introduction port 27, and the rich gas flow paths 35a and 35b reaching the auxiliary flame holes 29a and 29b are directly above the void 33 (branch portion). To position. Therefore, the rich mixed gas is short-circuited from the gap 33 (branch portion) to the upper portion through the rich gas supply passage 47, and is injected from the auxiliary flame holes 29a and 29b.

On the other hand, the light mixed gas injected from the main flame hole 36 once flows from the void 30 into the lower void 33 (branch) as shown in FIGS. After entering the inside of the fresh gas flow passage 28, it passes through the fresh gas mixing portion 23, which is a large curved portion, and largely detours to reach the main flame hole 36. Therefore, when a solenoid valve (not shown) is opened and the fuel gas is introduced from the fuel gas nozzle 11, a time lag occurs in the injection of the fuel gas from the two flame holes, and the auxiliary flame hole 29 is first generated.
A substantially equal amount of fuel gas is injected from a and 29b over the entire length, and a supplementary flame is generated. The fuel gas injected from the auxiliary flame holes 29a and 29b has a high concentration, and the fuel gas immediately ignites. Also, in particular, the auxiliary flame holes 29a, 29b
Immediately after the fuel gas is injected from, the low-concentration fuel gas has not yet been injected from the main flame holes 36, so it is not fueled by the low-concentration fuel gas. Therefore, the ignition of the fuel gas injected from the auxiliary flame hole is sure.

As described above, in the combustion apparatus 1 of this embodiment,
The rich gas that is sufficiently mixed with the air is the auxiliary flame holes 29a, 29.
b is uniformly supplied over the entire length of b, and the main flame holes 36
Is also supplied with fresh gas that is well mixed with air,
The concentration ratio of rich gas and light gas is stable, and a very stable flame can be obtained. In particular, prior to the main flame hole 36, the auxiliary flame hole 2
Since the high-concentration fuel gas is injected over the entire length from 9a, it has a structure in which the rich gas channel is short and it is difficult to obtain sufficient mixing, but the channel cross-sectional area of the mixing portion is reduced, enlarged, or the mixing promoting member 60. By appropriately disposing the inclined concentrated gas supply passage (narrow passage) 47, a small and stable mixed gas can be obtained.

Further, since a sufficiently mixed fuel gas can be produced, it is possible to obtain a flame having stable combustibility with a reduced NOx value and CO value. Further, even if a slight positional deviation or angular deviation occurs in the fuel gas nozzle due to dimensional tolerance during manufacturing, a stable mixed gas is generated, so that the manufacturability can be improved.

Next, a combustion apparatus according to another embodiment of the present invention will be described with reference to FIGS. Incidentally, FIG.
In each of FIG. 16, the combustion device 1 shown in the above embodiment
The same components as those in FIG.

FIG. 13A is a perspective view of a main part of a combustion apparatus 2 according to another embodiment of the present invention, and FIG. 13B is an explanatory view showing the flow of rich gas in the combustion apparatus 2. . The combustion device 2 of the present embodiment is the same as the combustion device 1 shown in the above embodiment,
This is a configuration in which the arrangement direction of the rich gas supply passage 47 (40) is changed and a baffle member 70 is newly added.

That is, in the combustion apparatus 1, the rich gas supply passage 4
7 (40) is provided so as to be inclined toward the inner side of the combustion device 1, but in the combustion device 2 of the present embodiment, the rich gas supply passage 47 is arranged in the vertical direction. Further, a baffle member 70 for forcibly deflecting the outflow direction of the fuel gas is provided near the downstream side outlet of the rich gas supply path 47. This baffle member 70
It is provided in a V shape over the upper side where the fuel gas flows out from a portion near the air inlet 27 near the downstream side outlet of the rich gas supply path 47. That is, the side wall 70a located near the air introduction port 27 is formed so as to be inclined rearward with respect to the air introduction port 27 so as to be inclined in the depth direction of the combustion device 1, and the upper wall that continues to the upper end of the side wall 70a. 70b is provided in a substantially horizontal direction.

The baffle member 70 is formed by forming recesses in the plate members 15 and 18 forming the sub-structure 12 by press molding, and the tips of the recesses form the plate members 16 and 17 forming the main structure 20. Has a depth to abut. According to this configuration, the gap 45 is provided vertically upward from the rich gas supply passage 47.
The fuel gas ejected to the fuel gas flows obliquely upward along the side wall 70a of the baffle member 70, is deflected in the depth direction of the combustion device 2 by the shielding of the upper wall 70b, and diffuses while flowing. As a result, similar to the above-described combustion device 1, the fuel gas is evenly supplied to the plurality of weir flow paths 18h, and the fuel gas can be ejected from the auxiliary flame holes 29a and 29b at the same time over the entire length. It is possible.

In this embodiment, the side wall 7 of the baffle member 70 is used.
0a is inclined and the upper wall 70b is provided substantially horizontally, but the side wall 70a may be provided vertically or the upper wall 7b may be provided depending on the arrangement of the inter-weir flow path 18h and the rich gas supply path 47.
It is also possible to adjust the deflection direction by providing 0b with an inclination.

FIG. 14 (a) is a perspective view of the main part of a combustion apparatus 3 according to another embodiment of the present invention, and FIG. 14 (b) is an explanatory view showing the flow of rich gas in the combustion apparatus 3. . The combustion device 3 of the present embodiment has a configuration in which the baffle member 70 of the combustion device 2 shown in the above embodiment is modified.

That is, in the combustion apparatus 2, the baffle member 70 having the side wall 70a and the upper wall 70b is provided in the vicinity of the rich gas supply passage 47. On the other hand, in the combustion apparatus 3 of the present embodiment, the baffle member 71 is arranged substantially horizontally in the vicinity of the downstream outlet of the concentrated gas supply passage 47 arranged in the vertical direction. Similarly to the baffle member 70 of the combustion device 2, the baffle member 71 is also formed by press-forming a recess in the plates 15 and 18 forming the sub-structure 12, and the tip of the recess is the main component 20. Has a depth that abuts the plate bodies 16 and 17 forming the. The width of the baffle member 71 is slightly wider than the inner diameter of the rich gas supply passage 47.

Further, although the baffle member 71 is arranged substantially horizontally, the dense gas passage forming bulging portion 18d formed on the plate member 18 is formed.
The sloping side 18e of the sloping side is inclined downward from the air introduction port 27 side in the depth direction of the combustion device 3. As a result, a narrow flow passage 71a having a narrow flow passage is formed on the air introduction port 27 side near the downstream side outlet of the rich gas supply passage 47, and a wide flow passage 71b having a wide flow passage is formed on the opposite side.

According to this structure, the fuel gas flowing vertically upward from the rich gas supply passage 47 collides with the baffle member 71 and is deflected to the left and right, so that the narrow passage 71a and the wide passage 71 are formed.
It flows to the b side. At this time, the narrow channel 71a having a high channel resistance
The flow amount to the side is small, and conversely, the wide flow path 7 with low flow path resistance
The flow amount to the 1b side increases. Therefore, by adjusting the narrow passage 71a and the wide passage 71b, it is possible to uniformly supply the fuel gas to the plurality of inter-weir passages 18h as in the above-described combustion device 2. In particular, in the configuration of the present embodiment, the fuel gas is also supplied to the inter-weir flow path 18h on the side of the air introduction port 27 that is close to the rich gas supply path 47 through the narrow flow path 71a. In addition, good ignitability can be ensured even if the ignition device is provided in the upper portion on the air introduction port 27 side.

In the present embodiment, the baffle member 71 is provided substantially horizontally, but by tilting the baffle member 71, the flow passage resistances of the narrow passage 71a and the wide passage 71b are adjusted to adjust the fuel gas. The flow direction of the can be adjusted.

FIG. 15 is an explanatory view showing the structure of the combustion device 4 according to another embodiment of the present invention and the flow of the rich gas.
In the combustion devices 1 to 3 described so far, the outflow direction of the fuel gas flowing out from the rich gas supply passage 47 is adjusted. On the other hand, in the combustion device 4 of the present embodiment, the outflow direction of the rich gas supply passage 47 is fixed, and the flow path 18h between the weir portions is
The flow path cross-sectional area (flow path resistance) of the
The amount of fuel gas flowing into h is equalized.

In the combustion apparatus 4 of this embodiment, the inter-weir flow passage 18h close to the rich gas supply passage 47 narrows the space between the weir portions 18f to reduce the flow passage cross-sectional area and increase the flow passage resistance. On the contrary, as the flow path 18h between the weir parts is separated from the rich gas supply path 47, the space between the weir parts 18f is widened to increase the flow path cross-sectional area of the flow path 18h between the weir parts to reduce the flow path resistance. ing. Further, since the rich gas supply passage 47 is arranged vertically like the combustion device 3, the fuel gas flows out from the rich gas supply passage 47 substantially vertically upward.
Therefore, when adjusting the flow passage cross-sectional area of the inter-weir flow passage 18h, the value is set in consideration of the outflow direction of the fuel gas.

According to this structure, the rich gas flowing out from the rich gas supply passage 47 easily flows into the interweir passage 18h having a low passage resistance away from the rich gas supply passage 47, and the rich gas supply passage Regardless of the distance from 47, it is possible to supply the fuel gas to the inter-weir flow paths 18h substantially uniformly at the same time. As a result, the rich gas can be evenly ejected from the auxiliary flame holes 29a and 29b to improve the ignitability and the flame-retarding property.

In particular, in the combustion device 4 of this embodiment, the flow passage cross-sectional area of the flow passage 18h between weirs is adjusted while taking into consideration the outflow direction of the fuel gas from the rich gas supply passage 47, so the auxiliary flame hole 2
It is possible to eject a uniform concentrated gas from 9a, 29b over the entire length. Further, this configuration can be applied to a configuration in which the fuel gas is ejected from the opening instead of the rich gas supply passage 47. For example, instead of providing the rich gas supply path 47, the plate members 16 and 17 on the main constituent side are bulged outward to form a closed portion that shields the upper and lower voids 33 (branching portions) and 45, and this closed portion is formed. The present invention can be applied to the configuration in which the opening for ejecting the fuel gas into the gap 45 is provided, and the design for easily supplying the fuel gas to each of the branch channels becomes easy.

FIG. 16 is an explanatory diagram showing the structure of the combustion apparatus 5 and the flow of concentrated gas according to still another embodiment of the present invention. In the combustion device 5 of the present embodiment, the rich gas supply passage 47 is arranged in the vertical direction as in the case of the combustion devices 2 to 4. Further, unlike the above-mentioned combustion apparatus, the baffle members 70 and 71 are not provided, and the flow passage cross-sectional area of the inter-weir flow passage 18h is not adjusted. However, in the combustion device 5 of the present embodiment, as shown in the figure, the flow path 1 between the weir parts in which the extension lines of the rich gas supply path 47 are adjacent to each other
The arrangement of the rich gas supply path 47 and the flow path 18h between each weir portion is adjusted so as to pass through substantially the center of 8h. In other words, the fuel gas flowing out from the rich gas supply path 47 has a specific weir flow path 18h.
It adopts a configuration that does not directly flow into the.

According to this structure, the fuel gas flowing out from the rich gas supply passage 47 in a substantially vertically upward direction is provided with the inter-weir flow path 18.
The flow direction is deflected to the left and right by colliding with the weir portion 18f between h, and is diffused while flowing to the left and right and supplied to each inter-weir channel 18h. In other words, by deflecting the fuel gas flowing in the vertical direction to the left and right, the fuel gas can be supplied to each of the branch passages substantially evenly, and the fuel gas is evenly distributed over the entire length of the auxiliary flame holes 29a and 29b. It is possible to eject.

In the above-described combustion devices 1 to 5 of the present embodiment, the shape of the groove-like weir portion 18f and interweir passage 18h provided in the rich gas passage for promoting the mixing of the fuel gas is as follows. The shape is not limited to the shape shown in the above embodiment, and an appropriate shape can be adopted, and the number of arrangements can be set appropriately. Further, in the embodiment described above, the concentrated gas supply path 47 (groove 40) is provided in the sub-structure 12 so that the fuel gas flows through the supply path 47. Conversely, the groove 40 is provided on the main structure side. It may be provided and the concentrated mixed gas may be passed upward from the site.

[0108]

According to the combustion device of the present invention as set forth in claims 1 to 3, the high-concentration fuel gas can be uniformly ejected over the entire length of the auxiliary flame hole, and the ignitability and the flame-retarding property can be obtained. It is possible to realize improved stable combustion. According to the present invention as set forth in claims 4 to 6, it is possible to stabilize the supplementary flame in advance of the main flame, improve the ignitability and the transferability, and suppress the occurrence of unburned gas and oscillatory combustion to achieve stable combustion. It is possible to provide a high quality combustion device that realizes the above.

[Brief description of drawings]

FIG. 1 is a perspective view of a combustion apparatus according to a specific embodiment of the present invention.

FIG. 2 is an exploded perspective view of the combustion device of FIG.

FIG. 3 is a plan view of the combustion device of FIG. 1 and an enlarged view thereof.

FIG. 4 is a development view of the combustion device of FIG. 1.

5 is an explanatory view showing a folded structure of the plate body of FIG.

6 (a) is a perspective view showing the flow of fuel gas on the rich gas flow path side in the combustion apparatus of FIG. 1, and FIG. 6 (b) is a front view thereof.

FIG. 7 is an explanatory diagram showing the flow of fuel gas on the side of the fresh gas flow path in the combustion apparatus of FIG.

8 is a cross-sectional view taken along the line AA of FIG.

9A is a sectional view taken along line BB of FIG. 1, and FIG. 9B is a sectional view taken along line CC of FIG.

10 is a perspective view as seen from the direction of arrow D in FIG.

FIG. 11 is a view in the direction of the arrow D in FIG.

FIG. 12 is an explanatory diagram showing a flow of fuel gas around a mixing portion in the combustion apparatus of FIG.

13A is a perspective view showing a structure around a mixing portion of a combustion apparatus according to another embodiment of the present invention, and FIG. 13B is an explanatory view showing a flow of fuel gas on the rich gas passage side. .

FIG. 14A is a perspective view showing a structure around a mixing portion of a combustion apparatus according to another embodiment of the present invention, and FIG. 14B is an explanatory view showing a flow of fuel gas on the rich gas passage side. .

FIG. 15 is an explanatory view showing the flow of fuel gas on the rich gas flow path side of the combustion apparatus according to another embodiment of the present invention.

FIG. 16 is an explanatory view showing the flow of fuel gas on the rich gas passage side of the combustion device according to another embodiment of the present invention.

[Explanation of symbols]

1,2,3,4,5 combustion device 18f branch channel 27 Air inlet 28 fresh gas flow path 29a, 29b Auxiliary flame hole 33 Branch (gap) 34 Ignition device 35a, 35b concentrated gas flow path 36 Main flame hole 43 Concentrated gas inlet 47 narrowed passage 48 mixing section 70,71 Deflection part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masaaki Matsuda             93 Edo-cho, Chuo-ku, Kobe-shi, Hyogo Stock Association             Company Noritsu (72) Inventor Shingo Kimura             93 Edo-cho, Chuo-ku, Kobe-shi, Hyogo Stock Association             Company Noritsu (72) Inventor Keiichi Miura             93 Edo-cho, Chuo-ku, Kobe-shi, Hyogo Stock Association             Company Noritsu (72) Inventor Masahiro Iguchi             93 Edo-cho, Chuo-ku, Kobe-shi, Hyogo Stock Association             Company Noritsu F term (reference) 3K017 AA02 AA06 AB02 AB07 AC02                       AD01 AD04 AD08 AD11 CA04                       CA06 CB01 CB09 CE01 CE04                       DD01 DD08                 3K065 TA01 TA13 TA14 TD05 TG01                       TH01 TH04

Claims (8)

[Claims] 1. A main flame hole for injecting a low concentration fuel gas,
In a combustion device having an auxiliary flame hole for injecting a fuel gas that spreads in a long shape and has a higher concentration than the fuel gas injected from the main flame hole, the fuel gas is connected to the auxiliary flame hole and the fuel gas is supplied to the auxiliary flame hole. The rich gas passage having a large cross-sectional area, and the rich gas supply passage opening to the rich gas passage and having a small cross-sectional area for supplying the fuel gas to the rich gas passage are provided. A combustion device characterized in that the opening portion for is located off the center of the rich gas passage, and the opening direction of the rich gas supply passage and / or the fuel gas injection direction is toward the center side of the rich gas passage. .. 2. A main flame hole for injecting a low concentration fuel gas,
In a combustion device having an auxiliary flame hole for injecting a fuel gas that spreads in a long shape and has a higher concentration than the fuel gas injected from the main flame hole, the fuel gas is supplied to the auxiliary flame hole and communicates with the auxiliary flame hole. It has a rich gas flow path with a large cross-sectional area and a rich gas supply path that opens into the rich gas flow path and has a small cross-sectional area for supplying the fuel gas to the rich gas flow path. A combustion device comprising a member. 3. A main flame hole for injecting a low concentration fuel gas,
In a combustion device having an auxiliary flame hole for injecting a fuel gas that spreads in a long shape and has a higher concentration than the fuel gas injected from the main flame hole, the fuel gas is connected to the auxiliary flame hole and the fuel gas is supplied to the auxiliary flame hole. A rich gas flow passage having a large cross-sectional area and a rich gas supply passage having a small cross-sectional area that opens into the rich gas flow passage and supplies the fuel gas to the rich gas flow passage are provided. And a channel between the weirs is formed between the weirs, and the extension line of the rich gas supply channel and the channel between the weirs are deviated from each other. 4. An air inlet for introducing air or a low-concentration fuel gas, a rich gas inlet for introducing air and a high-concentration fuel gas, and a main flame hole that connects the air inlet and a main flame hole. One of the high-concentration fuel gas adjusted by the mixing unit has a light gas flow path for supplying the fuel gas to the flame hole, and a mixing unit communicating with the rich gas inlet for mixing the fuel gas and air. Part is supplied to the light gas flow path, and another part of the high-concentration fuel gas adjusted in the mixing part is supplied to the rich gas flow path through the rich gas supply path. The combustion device according to any one of 3 above. 5. A main flame hole that extends in a long shape and injects a low-concentration fuel gas, and an auxiliary flame that injects a fuel gas that extends in a long shape and has a higher concentration than the fuel gas injected from the main flame hole. In a combustion device having holes, an air inlet for introducing air or a low-concentration fuel gas, a rich gas inlet for introducing air and a high-concentration fuel gas, the air inlet and a main flame hole are provided. A high-concentration fuel adjusted in the mixing section, which has a fresh gas flow path which communicates with the main flame hole to supply the fuel gas and a mixing section which communicates with the rich gas introduction port and mixes the fuel gas with air. It is characterized by comprising a rich gas supply passage for supplying a part of the gas to the light gas passage and further supplying another portion of the high-concentration fuel gas adjusted in the mixing section to the rich gas passage. Combustion device. 6. The combustion apparatus according to claim 5, wherein another part of the high-concentration fuel gas is short-circuited to the rich gas passage by the rich gas supply passage. 7. A main flame hole that extends in a long shape and injects a low concentration fuel gas, and an auxiliary flame that injects a fuel gas that extends in a long shape and has a higher concentration than the fuel gas injected from the main flame hole. In a combustion device having holes, an air inlet for introducing air or a low-concentration fuel gas, a rich gas inlet for introducing air and a high-concentration fuel gas, the air inlet and a main flame hole are provided. It has a fresh gas flow path that passes the communication curved path and supplies the fuel gas to the main flame hole, and a mixing section that communicates with the rich gas introduction port and mixes the fuel gas and air, and is adjusted by the mixing section. A portion of the concentrated high-concentration fuel gas is supplied to the light gas passage, and another portion of the concentrated high-concentration fuel gas that has been adjusted in the mixing section is short-circuited to the rich gas passage. A combustion device characterized by having a passage. 8. The dense gas flow path and the light gas flow path are formed by stacking a plurality of plates, and the rich gas flow path is provided on both sides of the light gas flow path. The combustion apparatus according to any one of claims 1 to 7.