JPH08200626A - Burner - Google Patents

Abstract

PURPOSE: To provide a burner in which the cooling effect as desired can be expected by extremely uniformizing the air quantity flowing an air flow passage in the circumferential direction without particularly increasing in size a fan as an air supply means. CONSTITUTION: In a burner, a burner port 7 for burning mixed gas of fuel gas and combustion air is formed at one end face, a plurality of flat burning parts 3 formed with mixing chambers, etc., communicating with the port 7 are aligned at an interval in a combustion chamber case 2, a cylindrical air flow passage is formed between a burner case 1 installed on the outer periphery of the case 2 and the case 2, and an air supply means communicates with the passage the supply cooling air. A partitioning means 25 for dividing the passage in the circumferential direction is installed between the chamber case in the passage and the burner case to form a plurality of divided air passages 24a, 24b, 24c, 24d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a flame port for burning a mixture of fuel gas and combustion air formed on one end surface, and
A plurality of flat combustion sections, each having a mixing chamber communicating with the flame opening and an inlet for introducing the fuel gas and the combustion air into the mixing chamber, are arranged side by side in the combustion chamber case at intervals. Then, a burner case is arranged on the outer periphery of the combustion chamber case, and a cylindrical air flow passage is formed between the burner case and the combustion chamber case over the entire outer circumference of the combustion chamber case. The present invention relates to a combustion device configured to communicate air supply means with an air flow passage so that cooling air is circulated in the air flow passage.

[0002]

2. Description of the Related Art As a combustion apparatus having such a structure, a combustion apparatus of the type in which secondary air is supplied from between the above-mentioned flat combustion sections or a primary air mixing ratio between the flat combustion sections is controlled. There are various types of combustion devices such as a so-called rich-lean combustion device that discharges and burns a large light-air mixture.
Further, conventionally, in this type of combustion device, the tubular air flow passage extending over the entire outer circumference of the combustion chamber case has been configured as one flow passage that communicates in the circumferential direction.

[0003]

However, the distance between the burner case and the combustion chamber case is not always constant in the circumferential direction, and the distance between the two cases is not constant. Various members such as a spacing member for holding in the air are often locally interposed, and the pressure loss of air in the circumferential direction in the air flow passage is not constant, so that the conventional device However, there is a drawback in that the amount of air flowing through the air flow passage varies, and a portion where the amount of air required for cooling does not flow locally occurs. Of course, it is conceivable to increase the total air volume so that the required amount of air will flow to the location with a large pressure loss, but in that case, a large amount of air will be concentrated in the location with a small pressure loss. When it is distributed, it may adversely affect the combustion itself. Moreover, for that purpose, it is necessary to increase the size of a fan or the like as an air supply means, which may lead to another problem such as an increase in cost and an increase in noise.

The present invention focuses on such a conventional problem, and its purpose is to control the amount of air flowing in the air flow passage without increasing the size of a fan as an air supply means. The object of the present invention is to provide a combustion device which can be expected to have a desired cooling effect by making the direction uniform as much as possible.

[0005]

In order to achieve this object, a first characteristic configuration of a combustion apparatus according to the present invention is such that a flame port for burning a mixture of fuel gas and combustion air is formed on one end surface. And a plurality of flat combustion sections having a mixing chamber communicating with the flame port and an introduction port for introducing the fuel gas and the combustion air into the mixing chamber, which are spaced apart from each other in the combustion chamber case. The burner cases are arranged side by side, and a burner case is arranged on the outer circumference of the combustion chamber case, and a cylindrical air flow passage is formed between the burner case and the combustion chamber case over the entire outer circumference of the combustion chamber case. Along with this, an air supply means communicates with this air flow passage, and a combustion device configured to circulate cooling air in the air flow passage,
Partitioning means for dividing the air flow passage in the circumferential direction is disposed between the combustion chamber case and the burner case in the air flow passage, and a plurality of divided air flow passages are provided on the outer periphery of the combustion chamber case. It is in the point of being formed.

In the second characteristic configuration, blocking plates for blocking the flow of air are provided between the air supply means and each of the divided air flow passages, and a through hole for air circulation is formed in each of the blocking plates. There is a point.

In the third characteristic configuration, each inlet of the combustion section is exposed to the inside of the air flow passage, and a part of the air flowing in this air passage is used as combustion air through each inlet. It is configured so as to be supplied to the mixing chamber of each combustion unit.

A fourth characteristic configuration is that the combustion chamber case and the burner case are formed in a rectangular shape when viewed from the flame mouth side, and the four side wall portions of the rectangular combustion chamber case and the burner case are They are arranged so that the ones facing each other are substantially parallel to each other, and the partition means is arranged at four corners of the combustion chamber case and the burner case, and the four side walls are provided on the outer periphery of the combustion chamber case. That is, a total of four divided air flow passages are formed along the section, and one of these four divided air flow passages faces all of the inlets of the combustion section.

A fifth characteristic configuration is that the flame port is a rich flame port that burns a rich air-fuel mixture, the combustion unit is a rich combustion unit, and a light air-fuel mixture is burned between the rich flame ports. In the light flame mouth,
In addition, a space between the rich combustion portions is formed as a light mixing chamber for forming a light mixture, and each of the light mixing chambers is connected to the air supply means.

A sixth characteristic structure is that a wind regulating plate made of a perforated plate is arranged between the air supply means and each mixing chamber for light, and the air regulating plate is arranged on the upstream side of the air regulating plate in the air flow direction. The point is that the supply means communicates with each of the divided air flow passages.

A seventh characteristic structure is that the partition means is fixed to the outer surface of the combustion chamber case, and the end portion of the combustion chamber case on the side of the air supply means is fixed to the burner case. Part of this is also used as the blocking plate.

[0012]

According to the first characteristic construction of the present invention, the air flow passage is surrounded by the combustion chamber case and the burner case in the cylindrical air flow passage between the burner case and the combustion chamber case. Since a plurality of divided air flow passages are formed on the outer periphery of the combustion chamber case by arranging partitioning means for dividing the air flow passage in one direction, the cylindrical air flow passage is formed as one flow passage. Compared with the conventional device, it is easier to make the amount of air flowing in the air flow passage uniform in the circumferential direction, and make it uniform in the outer circumferential direction of the combustion chamber case without increasing the size of the fan as an air supply means. The expected cooling effect can be expected.

According to the second characteristic configuration, blocking plates for blocking the flow of air are provided between the air supply means such as a fan and each of the divided air flow passages, and each of the blocking plates penetrates for air flow. Since the holes are formed, it is possible to equalize the pressure loss in each divided air flow passage by considering the number, size, and arrangement of the through holes formed in each blocking plate. It is possible to make the amount of air in the air flow passage more uniform in the circumferential direction and obtain a desired cooling effect.

According to the third characteristic configuration, each of the inlets of the combustion section faces the inside of the air flow passage, and a part of the air flowing in the air flow passage is used as combustion air for each inlet. The air supply means for supplying the cooling air and the air supply means for supplying the combustion air to each combustion section are configured to be supplied to the mixing chamber of each combustion section via By combining the two, it is possible to reduce the size and cost of the entire combustion device.

According to the fourth characteristic constitution, the combustion chamber case and the burner case are formed in a rectangular shape when viewed from the flame mouth side,
Since the four side walls of the rectangular combustion chamber case and the burner case are arranged such that the opposing ones are substantially parallel to each other, when the combustion device is assembled to a hot water supply device or the like, for example, Compared to the case where the combustion chamber case and the burner case are formed in a circular shape, it is possible to assemble them with less wasted space. Then, the partition means is arranged at four corners of the rectangular combustion chamber case and the burner case,
A total of four divided air flow passages are formed on the outer circumference of the combustion chamber case along the four side wall portions, and one of these four divided air flow passages faces all of the inlets of the combustion section. Since it is unique, the inlets can be concentrated on one of the four sides, the device itself can be assembled in a convenient manner, and it is extremely convenient for subsequent maintenance and inspection.

According to the fifth characteristic configuration, the flame port is a rich flame port that burns a rich air-fuel mixture, the combustion section is a rich combustion unit, and a light air-fuel mixture is provided between the rich flame ports. And a light-mixing chamber that forms a light-air mixture between the rich combustion sections, and communicates each of the light-mixing chambers with the air supply means. Therefore, this combustion device can be used as a so-called rich / lean combustion device that produces less NOx, and moreover, an air supply means for both supplying cooling air and supplying combustion air to the rich combustion part is provided. Further, the combustion air can also be supplied to the light combustion section, and the size of the combustion device can be further reduced.

According to the sixth characteristic configuration, since the air regulating plate made of a perforated plate is disposed between the air supply means and each of the light mixing chambers, each air mixing plate is provided by the air regulating plate. The amount of the combustion air supplied to the air can be made uniform to stabilize the combustion at each fresh flame port, and moreover, on the upstream side in the air circulation direction with respect to this air conditioning plate, the air supply means and each divided air Since it communicates with the flow passage, even though one air supply means also serves to supply cooling air and combustion air to the combustion section, they may affect each other in terms of air circulation. It is possible to supply the cooling air and the combustion air satisfactorily with a small amount.

According to the seventh characteristic configuration, the partition means is fixed to the outer surface of the combustion chamber case, and the end of the combustion chamber case on the air supply means side is fixed to the burner case. When assembling the combustion chamber case and the partitioning means to the burner case, the combustion chamber case and the partitioning means are treated as an integrated body and inserted into the burner case, and then,
It is only necessary to join both cases by spot welding, etc. Moreover, since part of this combustion chamber case is also used as the blocking plate, it is not necessary to assemble the blocking plate separately,
Assembly work of the device can be performed easily and quickly.

[0019]

As described above in detail, according to the first characteristic configuration, the cylindrical air flow passage between the burner case and the combustion chamber case is divided into a plurality of divided air flow passages. In addition, the amount of air flowing in the air flow passage can be easily equalized in the circumferential direction, and a uniform cooling effect in the outer circumferential direction of the combustion chamber case can be expected without increasing the size of a fan or the like for supplying air.

According to the second characteristic configuration, the number and size of the through holes formed in each blocking plate between the air supply means and each of the divided air flow passages, as well as the arrangement, are taken into consideration, It is also possible to equalize the pressure loss in each divided air flow passage, and to further equalize the air amount in the circumferential direction of the air flow passage.

According to the third characteristic configuration, each inlet of the combustion section is exposed to the air flow passage, so that an air supply means for supplying cooling air and a combustion air supply to each combustion section. It is also possible to reduce the cost and reduce the size of the combustion device by also using as an air supply means for.

According to the fourth characteristic constitution, by making the combustion chamber case and the burner case rectangular, it is possible to reduce the wasted space and to assemble them into a hot water supply device and the rectangular combustion chamber case. By consolidating all of the inlets of the combustion section on one of the four sides of the burner case, it is possible to facilitate the assembly of the device and the subsequent maintenance and inspection.

According to the fifth characteristic constitution, the combustion device itself can be a rich / lean combustion device with a small amount of NOx generation, and moreover, the cooling air is supplied and the rich combustion part is burned by one air supply means. The air can be supplied and the combustion air can be supplied to the light combustion section, and the size of the combustion device can be reduced.

According to the sixth characteristic configuration, the air regulating plate disposed between the air supply means and each of the light mixing chambers makes the amount of combustion air supplied into each light mixing chamber uniform. It is possible to stabilize the combustion at the light-burning flame port and to eliminate the effects of each other, even though one air supply means also serves to supply cooling air and combustion air to the combustion section. It is possible to supply cooling air and combustion air.

According to the seventh characteristic configuration, the combustion chamber case and the partitioning means can be handled as one body, which facilitates the work of assembling the combustion chamber case and the partitioning means into the burner case, and the pressure loss. Since it is not necessary to separately assemble the blocking plate for adjustment, the assembling work can be facilitated and speeded up.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A combustion apparatus according to the present invention is used, for example, in a burner unit of a hot water supply apparatus, and an embodiment applied to a density combustion apparatus will be described with reference to the drawings. As shown in FIGS. 1 to 3, a rectangular combustion chamber case 2 is also provided inside a rectangular burner case 1, and a rich combustion burner 3 as a flat rich combustion portion is provided inside the combustion chamber case 2. Are arranged side by side at predetermined intervals and are stored. A fan 4 as an air supply means for supplying combustion air and cooling air is located below the burner case 1, and a discharge port 4a of the fan 4 is opened at the bottom of the burner case 1. An air chamber 6 is formed between the bottom of the burner case 1 and the air conditioning plate 5 that is a perforated plate and forms the bottom of the combustion chamber case 2.

The rich combustion burner 3 has a flat rich flame outlet 7 for upwardly discharging a rich mixture having a small primary air mixing ratio.
And a rich mixing chamber 8 communicating with the rich flame port 7, a rich introducing port 9 for introducing a fuel gas for producing a rich mixture and combustion air into the rich mixing chamber 8. ing. The burner 3 for rich combustion is formed from a single plate-shaped body made of metal, and the plate-shaped body is bent at the portion of the flame port 7 for thickening and stuck together to form the thickening mixing chamber 8 or the rich mixture chamber 8. And a fuel gas and combustion air are provided in the lean gas burner passage 10, which will be described later. The light introduction port 12 having an elliptical cross-section for introducing is formed integrally with the same plate-like body and the periphery thereof is joined by spot welding.

The flat rich burners 3 thus formed are housed side by side in the combustion chamber case 2 at a predetermined interval, so that the adjacent dense burn burners 3 have a flat interval. A space is created, and this space is used to form the light burner burner 10 as the light burner section. Specifically, between the rich flame ports 7 of the rich combustion burner 3, there is formed a light flame port 13 for upwardly discharging a light air-fuel mixture having a large primary air mixing ratio. Is formed as a light mixing chamber 14, and a mixture gas is ejected into the light mixing chamber 14 from a plurality of ejection ports 15 formed in the light gas passage 11. And a plurality of straightening vanes 1 fixed to the burner 3 for rich combustion.
6 are arranged at each light flame port 13.

As shown in FIG. 4, the combustion chamber case 2 has a U-shaped case body 2a as seen from above, and a front plate 2b which can be fixed to the case body 2a by a bolt (not shown). The air conditioning plate 5 is fixed below the case body 2a and the front plate 2b. Case body 2a
Among them, a large number of protrusions 17a for holding the burner 3 for rich combustion are integrally formed at the upper end of the rear plate facing the front plate 2b and the upper end of the front plate 2b. Also, similar protrusions 17b are integrally formed in the upper and lower two stages, and the opening opened by forming the upper and lower two stages of the protrusions 17b is closed by another blocking member 18. Therefore, by inserting the burners 3 for rich combustion between the protrusions 17a, 17b and placing the lower end of the burner 3 on the upper surface of the air conditioning plate 5, as described above, a large number of burners for rich combustion are provided inside the combustion chamber case 2. 3 are arranged side by side at a predetermined interval, and in this housed state, the thickening inlet 9 and the lighting inlet 12 have the thickening opening 19 and the lightening opening in the front plate 2b. It is configured so as to correspond to the parts 20 and 20 respectively.

The burner case 1 also has a U-shaped case body 1a when viewed from above, and a front plate 1b is fixed to the case body 1a to close the upper front surface of the case body 1a. Further, the case body 1a and the front plate 1b are divided into a header for concentrated gas 21 for distributing and supplying the fuel gas for concentrated by a partition plate 23a and a header for thin gas 22 for distributing and supplying fuel gas for fresh. The case 23 is fixed to close the front surface of the case body 1a. That is, the burner case 1 is composed of the case body 1a, the front plate 1b, the header case 23, and the bottom plate 1c, and the discharge port 4a of the fan 4 is opened in the bottom plate 1c.

The combustion chamber case 2 is positioned and fixed in the burner case 1 so that the above-mentioned air is provided between the bottom plate 1c of the burner case 1 and the air conditioning plate 5 forming the bottom of the combustion chamber case 2. Since the chamber 6 is formed, the burner case 1 which is also rectangular when viewed from the thickening flame port 7 side.
The four side walls of the case 2 and the combustion chamber case 2 are positioned substantially parallel to each other while maintaining a constant space between the opposing ones. Flow passage 2
4 is formed. This air flow passage 24 is located over the entire outer circumference of the combustion chamber case 2, but at the four corners of the rectangular combustion chamber case 2 and the burner case 1, there is a seal as a partitioning means made of ceramic paper or the like. The material 25 is located and, as shown in FIG. 5, is divided into a total of four divided air flow passages 24a, 24b, 24c, and 24d along the walls of the four sides on the outer periphery of the combustion chamber case 2, and each divided air is divided. Flow passages 24a, 24b, 24c, 24d
Are communicated with the air chamber 6.

That is, the case body 2 of the combustion chamber case 2
As shown in the enlarged view of FIG. 7, the lower ends of the three sides of a are bent outward in a stepwise manner and abut on the inner surface of the case body 1a of the burner case 1, and the abutting portions are spotted. It is fixed to the case body 1a by welding. As a result, this stepped bent portion is divided into the divided air flow passages 24b, 2
Blocking plate 26 for blocking communication between 4c and 24d and the air chamber 6
The blocking plate 26 is provided with a large number of through holes 27 for air circulation, and the divided air flow passages 24b, 24c, 24d are connected to the air chamber 6 through the through holes 27.
That is, it is communicated with the fan 4. Similarly, the lower end portion of the front plate 2b of the combustion case 2 is also bent outward in a stepwise manner, and the front plate 2b is brought into contact with the header case 23 constituting the burner case 1 and its contact. The contact portion is fixed to the header case 23 with a bolt (not shown). The stepped bent portion of the front plate 2b also acts as the blocking plate 26, but again, the through hole 27 is formed and the remaining divided air flow passage 24a is also communicated with the fan 4.

In this way, the divided air flow passages 24a, 24a
Between the b, 24c, 24d and the air chamber 6, a through hole 27 is formed.
Since the blocking plate 26 having the above is provided, it is possible to select the number, size, and arrangement of the through holes 27 formed in the blocking plate 26 of each of the divided air flow passages 24a, 24b, 24c, 24d. , Each divided air flow passage 24a, 24
By making the pressure loss of b, 24c and 24d uniform, it becomes possible to circulate substantially the same amount of cooling air in each of the divided air flow passages 24a, 24b, 24c and 24d. The blocking plate 26 is used as the case body 2 of the combustion chamber case 2.
a and the front plate 2b, and the sealing material 25 is fixed to the outer surface of the combustion chamber case 2, the combustion chamber case 2 is inserted inside the burner case 1,
After that, it is only necessary to fix the burner case 1 to the burner case 1 by spot welding.
Is relatively easy to assemble. As shown in FIG. 7, another sealing material 28 is interposed at the stepped bent portion of the lower end of the combustion chamber case 2 on the case body 2a side. The sealing material 28 is spot welded. This is to prevent the cooling air from flowing in through the gap between the burner case 1 and the case body 1a joined together, and is not always necessary.

The rich gas header 21 including the header case 23 and the partition plate 23a is provided with a large number of rich gas nozzles 29, and the light gas header 22 is provided with a large number of light gas nozzles 30, respectively. The thickening gas nozzles 29 face the respective thickening inlets 9, and when the fuel gas is blown from the thickening gas nozzles 29, a part of the cooling air flowing through the divided air flow passages 24a is ejected by a predetermined amount. The mixture is sucked into the thickening inlet 9 at a ratio, mixed in the course of passing through the thickening mixing chamber 8 to generate a rich mixture, and this rich mixture is discharged from the thickening flame port 7. Similarly, each light gas nozzle 30 faces each light introducing port 12, and when the fuel gas is blown from the light gas nozzle 30, a part of the cooling air in the divided air flow passage 24a is ejected. The mixture is sucked into the light introduction port 12 at a predetermined ratio, premixed in the course of passing through the light gas passage 11, and the mixture is ejected from the ejection port 15 of the light gas passage 11 into the light mixture chamber 14. . Then, in the light-mixing chamber 14, the air-fuel mixture from the ejection port 15 and the combustion air supplied from the air chamber 6 via the air conditioning plate 5 are mixed to generate a light-air mixture. Is discharged from the light flame port 13.

The light air-fuel mixture thus generated is discharged from the light-air flame port 13 and burned, and the primary air-mixing ratio is small from the rich-air flame port 7 adjacent to the light-air flame port 13 alone. By discharging and burning a rich mixture capable of stable combustion, the combustion mixture of this rich mixture provides a flame-holding effect that allows the light mixture to be stably and continuously burned. Stable combustion is possible while suppressing the generation of NOx as much as possible, and the cooling air circulates in each of the divided air flow passages 24a, 24b, 24c, 24d, so that overheating of the combustion device is prevented. . A front plate auxiliary plate 31 is fixed to the front plate 2b of the combustion chamber case 2, and the front plate auxiliary plate 31 is attached to the burner case 1.
Although it is in contact with the inner surface of the front plate 1b of the, as shown in FIG.
A large number of through holes 32 are formed, and the cooling air flows through these through holes 32.

A rich gas supply path 33 is connected to the rich gas header 21 and a light gas supply path 34 is connected to the light gas header 22 so as to communicate with each other. A main gas amount adjusting valve V for adjusting the total amount of fuel gas to be supplied is provided in the main gas supply passage 35 on the upstream side of the location. The main gas amount adjusting valve V is for adjusting the heating power by changing the supply amount of the fuel gas to the combustion device, and when the main gas amount adjusting valve V requires a weak heating power that cannot be adjusted. Among the plurality of rich-burning burners 3 and light-burning burners 10, only some of the lean-burn burners 10 and some of the rich-burn burners 3 located on both sides thereof are burned.

[Other Embodiments] The above-described embodiments are examples in which the combustion apparatus of the present invention is applied to a rich-lean combustion apparatus. However, other than the rich-lean combustion apparatus, for example, for combustion arranged in parallel at intervals. The present invention can be applied to various combustion devices such as a combustion device configured to supply only secondary air for combustion from the space between burners. Further, the air flow passage 24 is divided by the partition means 25 into a plurality of divided air flow passages 24a, 24b, 2
In the case of dividing into 4c and 24d, the number and the dividing position can be changed as appropriate, and the through hole 27 for air circulation can be used.
With respect to the blocking plate 26 having the above structure, the blocking plate 26 may be configured separately from the combustion chamber case 2.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of drawings]

FIG. 1 is a right side sectional view of a combustion device.

FIG. 2 is a partially cutaway perspective view of a combustion device.

FIG. 3 is an enlarged cross-sectional view of a combustion device when viewed from the front.

FIG. 4 is an exploded perspective view of a combustion chamber case.

FIG. 5 is a top view of the combustion device.

FIG. 6 is a sectional view showing a combustion chamber case and a front plate auxiliary plate.

FIG. 7 is a cross-sectional view showing main parts of a combustion chamber case and a burner case.

[Explanation of symbols]

 1 Burner Case 2 Combustion Chamber Case 3 Rich Combustion Section 4 Air Supply Means 5 Air Conditioning Plate 7 Thickening Flame Port 8 Mixing Chamber 9 Inlet Port 13 Light Flame Port 14 Light Mixing Chamber 24 Air Flow Passage 24a Split Air Flow Passage 24b Split Air flow passage 24c Split air flow passage 24d Split air flow passage 25 Partition means 26 Blocking plate 27 Through hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Mochiki 1-2-1 Oka, Minami-shi, Minato-ku, Osaka, Osaka Prefecture Harman Co., Ltd.

Claims (7)

[Claims] 1. A mixing chamber (8) having a flame opening (7) for burning an air-fuel mixture of fuel gas and combustion air formed at one end surface and communicating with the flame opening (7), and the mixing chamber (8). A combustion chamber case (2) is provided with a flat combustion section (3) having an inlet (9) for introducing fuel gas and combustion air into the chamber (8).
A plurality of burner cases (1) are arranged side by side inside the combustion chamber case (2), and the burner case (1) is arranged on the outer periphery of the combustion chamber case (2). A cylindrical air flow passage (24) is formed between the combustion chamber case (2) and the air supply means (4) to communicate with the air flow passage (24). A combustion device configured to circulate cooling air in a passage (24), wherein the combustion chamber case (2) and the burner case (1) are provided in the air flow passage (24). A partition means (25) for dividing the air flow passage (24) in the circumferential direction is arranged in the outer periphery of the combustion chamber case (2), and a plurality of divided air flow passages (24a), (24b), (24c), (24
a combustion device forming d). 2. The air supply means (4) and each divided air flow passage (24a), (24b), (24c), (24d).
A blocking plate (26) for blocking the flow of air between and
2. The combustion apparatus according to claim 1, wherein each of the blocking plates (26) is provided with a through hole (27) for air circulation. 3. The inlet (9) of the combustion section (3) faces the air passage (24) and the air passage (2)
4. A structure in which a part of the air flowing in 4) is supplied to the mixing chamber (8) of each combustion section (3) as combustion air through each inlet (9). Combustion device. 4. The combustion chamber case (2) and the burner case (1) are formed in a rectangular shape when viewed from the flame port (7) side,
These rectangular combustion chamber case (2) and burner case (1)
And the partition means (25) are provided at four corners of the combustion chamber case (2) and the burner case (1), while the four side walls of the combustion chamber case (2) and the burner case (1) are arranged such that the opposing walls are substantially parallel to each other.
And a total of four split air flow passages (24a) along the four side walls on the outer periphery of the combustion chamber case (2).
(24b), (24c), (24d) are formed, and these four split air flow passages (24a), (24b), (24
4. Each of the inlets (9) of the combustion section (3) faces one (24a) of c) and (24d).
Combustion device as described. 5. The flame port (7) is a rich flame port for burning a rich air-fuel mixture, the combustion section (3) is a rich combustion zone, and the rich flame ports (7) are lightly burned to each other. The light-burning flame port (13) for burning the air-fuel mixture and the light-air mixing chamber (14) for forming the light-air mixture between the rich combustion sections (3) are formed, and the light-air mixing chambers are used for mixing the light-air. Combustion device according to claim 4, characterized in that the chamber (14) communicates with the air supply means (4). 6. An air conditioning plate (5) made of a perforated plate is arranged between the air supply means (4) and each light mixing chamber (14), and the air circulation direction is more than the air conditioning plate (5). On the upper side of the air supply means (4) and the divided air flow passages (2)
The combustion device according to claim 5, which is in communication with 4a), (24b), (24c) and (24d). 7. The partition means (25) is fixed to the outer surface of the combustion chamber case (2), and the combustion chamber case (2).
7. The end portion of the air supply means (4) side of the above is fixed to the burner case (1), and a part of the combustion chamber case (2) is also used as the blocking plate (26). Combustion device.