JPH06347011A - Premixer - Google Patents

Abstract

PURPOSE:To provide a premixer by which uniform premixes of both thin gas and thick gas can be fed correspondingly to a plurality of burners and which is easy to manufacture and to set in the combustion device in its assembly. CONSTITUTION:On a gas holder 5 a premixing passage part 7 is provided and on the premixing passage part 7 a thin premixed gas-dispersing chamber 10 and a thick premixed gas-dispersing chamber 11 are provided. In the premixing passage part 7 two mixing passageways 8 for a thin premixed gas, each having an inlet for air 12 at one end and forming a dead end 14 at the other end, are formed in parallel and one in reverse relative to the other. Between the mixing passageways 8 a mixing passageway 9 for a thick premixed gas having an inlet for air 13 at each of the two ends is provided. Each of the mixing passageways 8, 9 has a gas ejection hole 18, 19 in the underside at the inlet for air 12, 13. Each of the mixing passageways 8 has at the dead end 14 an opening 15 which communicates with the thin premixed gas-dispersing chamber 10. The mixing passageway 9 has at the center an opening 16 which communicates with the thick premixed gas-dispersing chamber 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in a combustion device such as a water heater used for household use, small-sized business use, etc.
The present invention relates to a premixing device for producing a premixed gas of fuel gas and combustion air.

[0002]

2. Description of the Related Art As is well known, recently, a burner device for clean combustion with less generation of nitrogen oxides has been actively developed, and FIG. 7 shows an example of the burner device of this development. It is shown in the built-in state.

In FIG. 1, a burner unit 30 includes a high-concentration burner 1 for burning high-concentration fuel premixed gas (hereinafter referred to as high-concentration premixed gas) and a low-concentration fuel premixed gas (hereinafter referred to as low-concentration premixed gas). A plurality of low concentration burners 2 for burning gas) are arranged side by side in a direction orthogonal to the paper surface of FIG. 7, and the burner unit 30 is collectively held by a burner frame 38. Flame tip forming surfaces 3 and 4 are formed on the tip side of the burners 1 and 2, and the flame mouth forming surfaces 3 and 4 are formed.
Is provided with a plurality of flame ports (not shown) for burning each premixed gas, and the flame port forming surfaces 3 and 4 are formed in a flat shape. Below the flame port forming surfaces 3 and 4 is a stirring section 36 having a throttle section 37 which is a throttle mechanism for premixed gas distribution, and a fuel gas and combustion air are provided on the base end side of the stirring section 36. A gas introduction port 32 for introducing is provided, and a gas nozzle 35 provided in a gas header 39 is provided on the opposite side of the gas introduction port 32.

A combustion fan 33 is provided below the burner frame 38, and by the rotation of the combustion fan 33, air is sent to the gas inlet 32 side of the burners 1 and 2 and supplied from the gas nozzle 35. It is introduced from the gas inlet 32 together with the fuel gas, mixed in the stirring section 36 to become a premixed gas, and the throttle section.
The jetting speed and gas amount of the premixed gas are controlled by 37, and the gas is evenly distributed. Then, the stirring unit 36 of the burner 1 for high concentration
From the high-concentration premixed gas is sent to the flame mouth formation surface 3 side,
The low-concentration premixed gas is sent from the stirring section 36 of the low-concentration burner 2 to the flame port forming surface 4 side, and the premixed gas of each concentration is emitted from the flame ports formed on the flame port forming surfaces 3 and 4. Gush out.
In this burner device, the passages from the gas introduction port 32 of each burner 1, 2 to the flame port forming surfaces 3, 4 of the burners 1, 2 function as a premixing section for producing a premixed gas.

In this type of combustion device, neither the high-concentration premixed gas nor the low-concentration premixed gas is difficult to burn by itself, but by arranging the high-concentration burner 1 and the low-concentration burner 2 side by side, The concentrated premixed gas burns by obtaining air from the low-concentration premixed gas, and the low-concentration premixed gas burns by receiving heat from the high-concentration premixed gas. By occupying a low temperature flame and burning at a low temperature, combustion with less generation of nitrogen oxides is achieved.

Further, a burner device having another structure as shown in FIG. 8 is known, and this product forms a main mixing chamber 70 and a sub mixing chamber 71 inside the burner device as shown in FIG. The main mixing chamber 70 and the sub mixing chamber 71 are partitioned by the partitioning member 72. The partition member 72 includes a plurality of cylindrical members 74 on the base plate 73.
Is provided upwardly with a space therebetween, and a flame port plate 75 made of a heat-resistant material such as ceramic is installed on the upper side of the tubular member 74, and a plurality of flame ports are formed in the flame port plate 75. ing.

[0007] The blower port 29 side of the combustion fan 33 and each mixing chamber 70,
The passage leading to 71 is connected without a gap, and the gas nozzle 34 is arranged in the passage leading from the fan 33 to the main mixing chamber 70.
Similarly, the gas nozzle 35 is also arranged in the passage from the fan 33 to the sub-mixing chamber 71, and the main mixing chamber 70 is provided with a straightening plate such as a punching metal plate 76 in which a plurality of punch holes 79 are formed in the metal plate. Has been. Then, the fuel gas ejected from each of the gas nozzles 34 and 35 and the air supplied from the fan 33 are mixed in the passage, and the punching metal 76 or the like in the main mixing chamber 70 promotes the mixing of the fuel gas and the air. On the other hand, a low-concentration premixed gas having a low gas concentration is produced and ejected from the flame port 77, and a high-concentration premixed gas having a high gas concentration is produced and ejected from the flame port 78 in the sub-mixing chamber 71. In this device, the parts from the gas nozzles 34, 35 to the flame ports 77, 78 function as a premixing section.

In this type of device, the high-concentration premixed gas and the low-concentration premixed gas are ejected side by side from the flame nozzles 77, 78 of the flame nozzle plate, and the main flame of the low-concentration premixed gas is formed on the burner combustion surface. By forming the supplementary flame of the high-concentration premixed gas next to each other, low-temperature combustion is performed in the same manner as in the apparatus of FIG. 7, and clean combustion with less generation of nitrogen oxides is performed.

[0009]

However, in the system in which the fuel gas and the combustion air are mixed in the stirring section 36 like the premixing section of the burner device shown in FIG. 7, the premixed gas is not mixed. Since the stirring portion 36 is formed with the throttle portion 37 in order to uniformly supply each flame nozzle side, there is a problem that the height of the burners 1 and 2 is correspondingly increased and the burner device becomes large. It was

When forming the throttle portion 37, particularly, the throttle portion 37 of the low concentration burner 2 for burning the low concentration premixed gas.
It is necessary to tighten the aperture of the
If the squeezing degree of the
When the premixed gas passes through the constricted portion 37, pressure acts on the premixed gas to make it difficult to pass, and a pressure loss occurs such that a sufficiently low concentration premixed gas is not supplied to the flame port side.
Then, in order to compensate for the pressure loss, the rotation speed of the combustion fan 33 is increased by that amount, and the air is stirred together with the fuel gas in the stirring section.
When it was supplied to the inside of the 36, there was a problem that the rotation noise and the blowing noise of the fan 33 became high.

Further, as in the case of the premixing section of the burner device shown in FIG. 8, in which the mixing chambers 70 and 71 are provided to mix the fuel gas and the combustion air, the mixing chambers 70 and 71 are
The gas nozzles 34 and 35 must be arranged in the vicinity of the 71 and the fan 33. For that purpose, a gas pipe must be laid in the combustion device or a gas pipe of a complicated shape must be provided.
This is a problem because it makes the combustor more complicated and larger.

Further, this burner device is equipped with mixing chambers 70 and 71.
It has a structure in which the backflow port 29 side of the combustion fan 33 is directly connected, and since the backflow port 29 of the fan 33 and the mixing chambers 70 and 71 must be connected without a gap, it is difficult to manufacture the device. Met.

Further, in such a burner device, as described above, when a straightening plate such as a punching metal plate 76 for promoting the mixing of fuel gas and air is provided,
Similar to the device of FIG. 7, pressure loss of the premixed gas occurs, and in order to compensate for it, the rotation speed of the combustion fan must be increased, and similarly, the rotation noise and backwind noise of the fan 33 become high, It was a problem.

The present invention has been made to solve the above problems, and its purpose is to easily manufacture the device and to incorporate it into a combustion device, and further, without using a throttle portion, a current plate, or the like. Another object of the present invention is to provide a premixing device capable of supplying high-concentration and low-concentration uniform premixed gas to a plurality of corresponding burners.

[0015]

In order to achieve the above object, the present invention is constructed as follows. That is, the present invention provides a premixing channel portion for mixing the fuel gas and air on the upper side of the gas holder for introducing the fuel gas along the longitudinal direction of the gas holder. A high-concentration premixed gas dispersion chamber, and a low-concentration premixed gas dispersion chamber on both sides of the high-concentration premixed gas dispersion chamber in the longitudinal direction,
Along the longitudinal direction of the premixing flow path portion, air introduction ports are formed at one end side and the other end side is a dead end low concentration premixed gas mixing flow path, which are alternately arranged side by side, and air introduction ports are provided at both end sides. The high-concentration premixed gas mixing flow path is formed in parallel with the low-concentration premixed gas mixing flow path, and is introduced from the air introduction port to the air introduction port side of the low-concentration premixed gas mixing flow path. A gas injection hole for ejecting a fuel gas from a gas holder is provided in a direction traversing the air to be blown, and a low-concentration premixed gas dispersion chamber in which a low-concentration premixed gas in which air and fuel gas are mixed through the flow passage is provided on a dead end side. The high-concentration premixed gas mixing passages are provided with gas ejection holes at both ends of the high-concentration premixed gas mixing passage for ejecting the fuel gas from the gas holder in a direction crossing the air introduced from the air introduction port. On the center side of the gas mixing channel,
It is characterized in that an opening is provided for guiding the high-concentration premixed gas that has been collision-mixed from both sides of the flow path to the high-concentration premixed gas dispersion chamber.

[0016]

In the present invention having the above-described structure, the fuel gas in the gas holder is jetted in a direction traversing the low-concentration premixed gas mixing passage from the gas injection hole on the inlet side, and the inlet side of the same passage. Proceed through the flow path while stirring and mixing with air entering from
The uniformly mixed low-concentration premixed gas is introduced into the low-concentration premixed gas dispersion chamber through the opening provided on the dead end side of the flow path.

Further, similarly to the above, the fuel gas in the gas holder is ejected from the gas ejection holes on both ends of the high-concentration premixed gas mixing passage in a direction crossing the same passage, and both end sides of the same passage. The high-concentration premixed gas that advances through the flow path while stirring and mixing with the air entering from the center of the flow path, is further impinged and mixed at the center side of the flow path, and is uniformly mixed. It is led to the mixed gas dispersion chamber.

Each premixed gas is distributed and supplied to a plurality of burners having a corresponding gas concentration through each premixed gas dispersion chamber,
For example, by combusting a burner for high-concentration premixed gas combustion and a burner for low-concentration premixed gas combustion that are arranged side by side, it is possible to realize a combustion device that can perform good clean combustion.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the premixing device according to the present invention. In the figure, a premixing flow path portion 7 for mixing the fuel gas and air is provided above the gas holder 5 having a horizontally long box shape for introducing the fuel gas through the gas pipe 6.
Is provided along the longitudinal direction of the premixing flow path portion 7, and a high concentration premixed gas dispersion chamber 11 having an upper surface opening for dispersing the high concentration premixed gas is provided on the upper side of the premixing flow path portion 7 at the center side thereof. A low-concentration premixed gas dispersion chamber with an upper opening for dispersing the low-concentration premixed gas is located on both sides of the concentration-premixed gas dispersion chamber in the longitudinal direction.
Ten are provided.

2 along the longitudinal direction of the premixing channel portion 7
A horizontally long low-concentration premixed gas mixing channel (hereinafter referred to as low-concentration channel) 8 is provided in the book, and the low-concentration channel 8 is
An air introduction port 12 is formed on one end side thereof, and a dead end side 14 is formed on the other end side thereof. The two low concentration flow passages 8 are alternately arranged side by side, and the air introduction ports 12 are also provided on opposite sides. Has been. Further, it is sandwiched between the low-concentration channels 8 and arranged in parallel with the low-concentration channels 8 to form one horizontally long high-concentration premixed gas mixing channel (hereinafter referred to as high-concentration channel) 9. The high-concentration channel 9 is provided with air introduction ports 13 on both ends thereof.

A plurality of gas ejection holes 18 are provided on the lower side wall surface of the air introduction port 12 of the low concentration passage 8, and the fuel gas ejected from the gas ejection holes 18 is introduced from the air introduction port 12. The gas ejection direction of the gas ejection hole 18 is set so that the air and the air are substantially orthogonal to each other. Further, gas ejection holes 19 are provided on the lower side wall surface on both sides of the air introduction port 13 on both sides of the high-concentration flow passage 9, and the gas is ejected from the gas ejection hole 19 as in the low-concentration flow passage side 8. The fuel gas is configured to cross the air introduced from the air introduction port 13 at a substantially right angle.

The area of the air inlet 12 and the area and number of the gas ejection holes 18 of the low-concentration channel 8 are determined by the theoretical air amount (theoretical amount) of the air ratio of the low-concentration premixed gas produced in the channel 8. Air ratio)
When set to 1.0, it is set to an appropriate value within the range of 1.4 to 2.5, and the air introduction port 13 of the high-concentration channel 9 is set.
The area and the area and number of the gas ejection holes 19 are set so that the air ratio of the high-concentration premixed gas produced in the flow passage 9 is an appropriate value within the range of 0.4 to 0.8.

On the dead end side 14 of the low concentration channel 8, a rectangular opening 15 is provided on the upper side, and a low concentration premixed gas in which air and fuel gas are mixed through the channel 8 is It is adapted to be guided to the low-concentration premixed gas dispersion chamber 10 through the opening 15, and an elliptical opening 16 is provided on the upper side at the center side of the high-concentration flow passage 9 to provide air and fuel. The high-concentration premixed gas which gas enters from both sides of the flow path 9 and collides at the central portion is introduced into the high-concentration premixed gas dispersion chamber 11 through the opening 16.

The present embodiment is configured as described above, and its operation will be described next. First, as shown in FIG. 3 (a), the low-concentration channel 8 on the front side of the premixing channel section 7.
Then, the combustion air is introduced into the flow path 8 from the direction A in the figure through the air introduction port 12 by the rotation of the combustion fan (not shown), and the fuel gas collides and mixes so as to be substantially orthogonal to the air. While stirring and mixing, the flow path 8 is passed in the direction of B. Then, the walls of the dead end side 14 of the flow path 8 collide and mix with each other, the mixing is promoted, and the uniform low-concentration premixed gas further changes its direction, as shown in (b) of FIG. 8 enters the low-concentration premixed gas dispersion chamber 10 through an opening 15 provided on the upper side of the dead end 14 and diffuses and disperses.

Also in the low-concentration channel 8 on the inner side of the premixing channel 7, the fuel gas and the air are mixed in the same manner as above, while advancing from the air inlet 12 side to the dead side 14 and flowing. Low-concentration premixed gas dispersion chamber through passage 8 and opening 15
Go into 10.

On the other hand, in the high-concentration flow passage 9, as shown in FIG. 4A, the air introduction ports 13 to the flow passage 9 are provided at both ends of the flow passage 9.
Air is introduced into the inside, and the fuel gas ejected from the gas ejection hole 19 collides and mixes so as to be substantially orthogonal to the air, and the fuel gas and the air are agitated and mixed while passing through the inside of the passage 9 and the passage 9
Flow toward the central side of the flow path, and the collision and mixing are performed on the central side opposite to each other, and further diffused by changing the direction, and as shown in FIG.
High-concentration premixed gas dispersion chamber 11 is passed therethrough and diffused and dispersed.

According to the present embodiment, the air introduced from the air introduction ports 12 and 13 of the respective flow passages 8 and 9 of the premixing flow passage portion 7 is substantially perpendicular to the gas ejected from the gas ejection holes 18 and 19. Since the air and the fuel gas are mixed easily while traversing each other, the respective flow paths 8 and 9 are formed in a horizontally long shape, and are further mixed when flowing in the flow paths 8 and 9 in a long section. To be done. In addition, the low-concentration premixed gas collides with the wall of the dead end side 14 on the side of the low-concentration channel 8 to promote mixing, and further changes the direction to further diffuse and mix, and the low-concentration premixed gas through the opening 15. High-concentration channel 9 that enters the dispersion chamber 10
On the side, the high-concentration premixed gas faces each other in the center of the flow path 9 and collides head-on, the mixing is promoted, and the direction is changed to further diffuse-mix and enter the high-concentration premixed gas dispersion chamber 11 through the opening 16. Therefore, each uniform concentration premixed gas is introduced into each concentration premixed gas dispersion chamber 10, 11.

As an example of the structure in which this premixing device is incorporated into a combustion device, for example, as shown in FIG. 5A, a distribution hole 26 for high-concentration premixed gas is provided in the center of the burner slit frame 20.
A plurality of low pressure premixed gas distribution holes 27
A plurality of high-concentration premixed gas distribution holes 26, the high-concentration premixed gas combustion burner 1 is fitted with a gas inlet 32, and the low-concentration premixed gas distribution holes 27 are distributed on both sides. Hole 27
The gas inlet 32 of the burner 2 for low-concentration premixed gas combustion is fitted and connected so as to straddle the above, and a plurality of burners 1 and 2 are provided. A burner section 22 having the burner slit frame 20, a plurality of high-concentration premixed gas combustion burners 1 and a plurality of low-concentration premixed gas combustion burners 2 is provided on the upper side of the premixing apparatus of this embodiment. For example, a burner device as shown in (b) of the figure can be manufactured, and this burner device supplies uniform concentrations of premixed gas to all the burner sides of each of the burners 1 and 2 at a time. Therefore, the burner device has a low pressure loss, a compact premixing mechanism, and a good combustion state.

Unlike the conventional example, this burner device does not use the throttling portion 37, the straightening plate, etc., and does not cause pressure loss due to them, and the fan rotation speed is adjusted to compensate the pressure loss. By increasing the height, the rotation noise and backwind noise of the fan become high, and the problem of becoming bothersome does not occur.

Further, in the premixing device of this embodiment, the premixing flow path portion 7 is elongated in the lateral direction, so that the dimension in the height direction can be shortened. Since the height dimension of the premixing device is short, as shown in FIG. 5, the burner device provided with the burner portion 22 on the upper side of the premixing device can be downsized, and further, The low-concentration premixed gas and the high-concentration premixed gas can be collectively produced by simply connecting one gas pipe 6 to the gas holder 5 of the premixing device, and can be supplied to the burners 1 and 2, so that The piping of the gas pipe 6 does not become complicated.

In addition, the air from the air inlets 12 and 13 into the flow passages 8 and 9 of the premixing flow passage portion 7 always enters the inside of the flow passages 8 and 9 by back wind from a fan or the like, so that air and fuel gas And so as to traverse each other in the flow paths 8 and 9, the fuel gas does not leak to the outside of the flow paths 8 and 9, and the mixed premixed gas is supplied to the premixed gas dispersion chambers 10 and 11, respectively. Since the air enters and then enters the respective burners 1 and 2, it is not necessary to connect the blower port 29 of the fan 33 and the mixing chambers 70 and 71 without a gap as in the conventional example shown in FIG. The burner device can be easily incorporated into the combustion device.

Further, the burner device of FIG. 5 (b), which is produced by using the premixing device shown in FIG. 1 as one block unit, is used as a burner device unit alone, and as shown in FIG. If an arrayed multi-stage burner device is produced, a gas valve 23 is provided in the gas pipe 6 connected to each gas holder 5, and by opening and closing the gas valve 23, the premixed gas is supplied to each burner device unit 21. Burner device unit can be supplied or not supplied
It is possible to easily perform face-to-face combustion for each of the 21 flame face formation faces, and it is possible to finely control the combustion amount of the entire burner device. Also, when manufacturing such a multi-stage burner device, it is only necessary to connect one gas pipe 6 for each burner device unit 21, and a gas pipe for supplying fuel gas to the entire burner device. The piping of 6 does not become complicated.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in the above embodiment, the rectangular opening 15 is provided above the low concentration flow path 8.
And an elliptical opening 16 is provided above the high concentration channel 9.
However, the shapes of the openings 15 and 16 are not limited to the shapes of the above-described embodiments, and other shapes such as a funnel shape with an expanded upper side may be used.

The number and area of the gas ejection holes 18 and 19,
The areas and the like of the air inlets 12 and 13 of the low concentration channel 8 and the high concentration channel 9 are not particularly limited, and may be appropriately designed according to the concentration of the premixed gas to be produced.

Further, in the above embodiment, both the gas injection holes 18 on the low concentration channel 8 side and the gas injection holes 19 on the high concentration channel 9 side are
The gas introduced from the air inlets 12 and 13 is the gas ejection hole 1
The fuel gas ejected from 8 and 19 was provided so as to cross substantially at right angles, but the gas ejection holes 18 and 19 are not necessarily provided so as to intersect at substantially right angles, and fuel gas and air are mixed. However, it suffices if it is configured to pass through the flow paths 8 and 9. However, if it is configured to cross at a right angle or a substantially right angle, the mixing of the fuel gas and the air can be further promoted.

Further, in the above embodiment, the high-concentration flow passage 9 was provided so as to be sandwiched between the low-concentration flow passages 8. However, the high-concentration flow passage 9 is not necessarily provided in such a manner that it is sandwiched between them, and they are arranged in parallel. It may be provided on the front side or the back side of the two low concentration flow paths 8.

[0037]

According to the present invention, the gas ejection holes provided on the air introduction port side of the low concentration passage and the high concentration passage have a direction in which the fuel gas traverses the air introduced from the air introduction port. Since the fuel gas and air cross each other and collide with each other, it is easy to stir and mix. In the flow path, the low-concentration premixed gas collides with the wall surface on the dead end side to further promote mixing, and in the high-concentration flow path, the high-concentration premixed gas passed from both ends of the flow path faces each other on the center side of the flow path. Since the premixed gases are sufficiently mixed with each other because they are collisionally mixed, they are in a uniform state.

Then, the mixed premixed gas is further diffused by changing its direction, and enters the low concentration premixed gas dispersion chamber and the high concentration premixed gas dispersion chamber through the openings provided in the respective flow paths. Therefore, each uniform premixed gas can be dispersed in each dispersion chamber.

Therefore, the present invention is provided on the upper side of the premixing device,
For example, if a burner group in which a plurality of burners for low-concentration premixed gas combustion and a burner for high-concentration premixed gas combustion are arranged side by side is provided, a uniform premixed gas for all burners at once It becomes possible to supply to the mouth side,
Unlike the conventional example, it is not necessary to provide a throttle part, a current plate, or the like to uniformly distribute each premixed gas and supply it to the burner side of the burner, and a pressure loss occurs due to the provision of the throttle part or the like. It is possible to manufacture a burner device that rarely occurs. Further, unlike the conventional example, it is not necessary to increase the rotation speed of the combustion fan to compensate for the pressure loss, and the rotation noise of the fan and backwind noise are not increased.

Further, in the premixing device of the present invention, since the premixing flow path portion is lengthened in the lateral direction, the dimension in the height direction can be shortened. Therefore, the combustion produced by incorporating this premixing device. The device can be small. Moreover, a single premixing device is used, as in the conventional method of separately providing a low-concentration premixed gas mixing chamber and a high-concentration premixing chamber and mixing fuel gas and air in each mixing chamber. There is no need to provide multiple gas inlets (gas nozzles), and there is no need to connect the combustion fan blower port side and the mixing chamber without a gap, so the structure of the combustion device does not become complicated and the device is manufactured. It can be done easily.

Further, if a burner device in which the premixing device of the present invention is used as one block unit is produced as a single burner device unit and a plurality of burner device units are arrayed, a multi-stage burner device is produced. By controlling the gas to be introduced into the gas holder of the premixing device with a gas valve etc. and supplying or not supplying it to each premixing device, the burner unit alone can be installed without complicated gas pipes. It is possible to easily manufacture a burner device that can easily perform face-switching combustion for each flame port forming face of
It is possible to finely control the combustion amount of the combustion device.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a premixing device according to the present invention.

2 is a plan view of the premixing device of FIG. 1. FIG.

FIG. 3 is an explanatory diagram showing an operation of producing a low-concentration premixed gas and dispersing it in the dispersion chamber 10.

FIG. 4 is an explanatory diagram showing an operation of producing a high-concentration premixed gas and dispersing it in the dispersion chamber 11.

FIG. 5 is an explanatory view showing a manufacturing example of a burner device using the premixing device of the above-mentioned embodiment.

FIG. 6 is an explanatory view showing a multi-stage burner device in which a plurality of burner devices of FIG. 5 are arranged.

FIG. 7 is an explanatory diagram showing an example of a conventional combustion device.

FIG. 8 is an explanatory diagram showing another example of a conventional combustion device.

[Explanation of symbols]

 8 Flow path for mixing low-concentration premixed gas 9 Flow path for mixing high-concentration premixed gas 10 Low-concentration premixed gas dispersion chamber 11 High-concentration premixed gas dispersion chamber 12, 13 Air inlet 14 Dead end side 15, 16 Opening 18, 19 Gas ejection hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroshi Komaki, 3-4 Fukamidai, Yamato City, Kanagawa Prefecture, Gaster Co., Ltd. (72) Inventor: Susumu Washikita, 3-4, Fukamidai, Yamato City, Kanagawa Prefecture (in Gaster Co., Ltd.) 72) Inventor Hitoshi Hayashi, 3-4, Fukamidai, Yamato City, Kanagawa Prefecture Gaster Co., Ltd. (72) Inventor Kouji Hase 3118-3 Uehongo, Matsudo City, Chiba Prefecture (72) Inventor Koichiro Ito 4-Kuninamicho, Koganei City, Tokyo 9-32 (72) Inventor Keiichi Ogi 1-13-18 Narita Higashi, Suginami-ku, Tokyo (72) Inventor Tatsuya Sugawara 52-5 Oyamakanei-cho, Itabashi-ku, Tokyo

Claims (1)

[Claims] 1. A premixing flow passage portion for mixing the fuel gas and air is provided on the upper side of a gas holder for introducing the fuel gas along the longitudinal direction of the gas holder, and on the upper side of the premixing flow passage portion at the center side thereof. The high-concentration premixed gas dispersion chamber is provided with low-concentration premixed gas dispersion chambers on both sides of the high-concentration premixed gas dispersion chamber in the longitudinal direction. The high-concentration premixed gas mixing flow channels with the inlets formed and the other end side with the dead ends are arranged side by side alternately, and the high-concentration premixed gas mixing channels with the air inlets formed at both ends A gas injection hole that is provided in parallel with the mixed gas mixing flow path, and injects fuel gas from the gas holder in the direction that traverses the air introduced from the air introduction port on the air introduction port side of the low-concentration premixed gas mixing flow channel. Air and fuel gas pass through the flow path on the dead end side. An opening is provided to guide the low-concentration premixed gas mixed into the low-concentration premixed gas dispersion chamber, and gas holders are provided at both ends of the high-concentration premixed gas mixing channel in a direction that traverses the air introduced from the air inlet. A gas injection hole for injecting fuel gas from the high-concentration premixed gas mixing channel is provided at the center side of the high-concentration premixed gas mixing channel into the high-concentration premixed gas dispersion chamber. A premixing device having an opening for leading.