JP4461385B2 - Burner and burner unit - Google Patents

Description

  The present invention relates to a burner used as a heating source for a gas appliance such as a water heater, and a burner unit formed by integrally combining a plurality of the burners.

  For example, in a water heater, a burner unit is provided below a cylindrical combustion chamber surrounding the periphery, a fan for supplying combustion air is provided below the burner unit, and a heat exchanger provided above the combustion chamber is a burner unit. It is structured to heat with combustion exhaust. The burner unit horizontally arranges a plurality of flat burners that have a gas passage of a mixture of fuel gas and combustion air and that have a plurality of flame openings on the upper surface in the thickness direction. These are often used as a unit by assembling them into a nozzle base.

In such a burner unit, if the combustion air is insufficient and the combustion state is deteriorated, there is a possibility that the combustion vibration is generated in resonance with the combustion chamber, which gives the user unpleasant feeling. In particular, in the burner, fuel gas and combustion air are divided into a rich mixture and a light mixture and mixed in advance in the mixing section, and the rich and light mixtures are ejected through different flow paths, respectively, and mainly in the pale flame opening. Concentration burners that reduce NOx (nitrogen oxide) by forming a flame at the flame outlet may be used, but this concentration combustion is a kind of oxygen deficient combustion. Vibration combustion due to turbulence is likely to occur.
Therefore, the present applicant, in such a light and dark burner, provides a flame-holding plate on one side of the flame outlet of the dark burner so as to rectify the mixture to rectify the flame. The technique which aims at stability is proposed (refer patent document 1). A measure for increasing the thickness of the flame mouth plate forming the flame mouth is also known.

JP-A-7-12312

  However, in this case, it is necessary to provide a flame holding plate for each dark burner and over the entire length of the burner so as to cover all the flame outlets. Become. This also applies to the case where the thickness of the flameneck plate is increased. In addition to the high cost, there is a problem that molding and assembly become difficult due to the increase in thickness.

  Therefore, an object of the present invention is to provide a burner and a burner unit that can effectively prevent the occurrence of combustion vibration with a simple configuration.

In order to achieve the above object, the invention according to claim 1 is a flame mouth plate in which ridges having an inverted U-shaped cross section are formed at predetermined intervals, and a first flame port is provided on the upper surface of each ridge. On the other hand, a small hole having an opening area smaller than that of the first flame port is formed on the left and right side walls of each ridge on the left and right side walls of each ridge, and the ridge is crossed perpendicularly. A partition bar is fixed between the first flame mouths, a second flame mouth is provided between the ridges, and the first flame mouth and the second flame mouth are determined depending on whether or not the air-fuel mixture flow path to the first flame mouth or the second flame mouth is bent . The flame mouth load is different between the two flame mouths, and the first flame mouth and the second flame mouth are randomly arranged.
In order to achieve the above object, the invention according to claim 2 is characterized in that a curved flame mouth plate is provided with a first flame mouth and a second flame mouth having a larger opening area than the first flame mouth. While alternately arranged in the left-right direction, an auxiliary plate is provided on the back side of the flame port plate, and the auxiliary plate is provided with a protrusion that protrudes backward corresponding to the first flame port and the second flame port, While fixing the part excluding the ridge in contact with the back of the flame mouth plate, the ridge corresponding to the first flame mouth is located at a position coaxial with the first flame mouth than the first flame mouth. While providing a through-hole with a large opening area, the protrusion corresponding to the second flame mouth is provided with a pair of small holes inclined toward the center side of the second flame mouth for each second flame mouth. Depending on the presence or absence of bending of the gas mixture passage leading to the mouth or the second flame mouth, the flame mouth load is made different between the first flame mouth and the second flame mouth, and the first flame mouth and the second flame mouth are randomly arranged. Characterized in that it was.

In order to achieve the above object, a third aspect of the invention is a burner unit formed by integrally joining a plurality of burners according to the first or second aspect .
In order to achieve the above object, a fourth aspect of the present invention is to integrally combine a plurality of burners each having a plurality of flame openings from which a mixture of fuel gas and combustion air is ejected. The burner unit according to claim 1 , wherein the burners according to claim 1 or 2 are alternately or randomly arranged.

According to the burner and the burner unit of the present invention, resonance energy is dispersed, and generation of combustion vibration in the combustion chamber can be effectively prevented. Since this effect can be achieved by a simple change of the flame outlet, the cost for preventing combustion vibration can be reduced.
In addition, the difference in the flame load can be easily set with a simple configuration in which the air-fuel mixture flow path is bent.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram illustrating an example of a burner unit provided in a water heater. The burner unit 1 includes a light flame inlet to which a light gas obtained by mixing fuel gas and combustion air is supplied, and the light flame outlet. Horizontally arranged so that a plurality of flat-shaped light and dark burners 2, 2,... Are provided on both sides and provided with a rich flame outlet to which a rich gas mixed with fuel gas and combustion air is supplied. These are integrated and integrated into a nozzle base 3 having a nozzle for light gas and a nozzle for concentrated gas for each burner. Below the nozzle base 3, there is provided a mixing section 6 to which an air supply fan 4 for supplying combustion air and a gas pipe 5 for supplying fuel gas are connected. In the mixing section 6, fuel gas and Combustion air is divided into rich gas and light gas and mixed in advance.

  As for the light and dark burner 2 used in the burner unit 1, two types of light flame outlets having different forms are alternately arranged. Of these, one type of light and dark burner 2A uses a flame mouth plate that is formed by stacking press-molded sheet metal so as to be longitudinal, thereby making an elliptical flame mouth extending in the horizontal longitudinal direction of the light and dark burner into a width direction and a long length. The other type of light and dark burner 2B has a well-known configuration arranged in the vertical direction, but the other type of light and dark burner 2B, as shown in FIG. A blister is formed by providing a blister plate 10 in which a plurality of kinds of blisters having different shapes and sizes, such as blisters 13 and 14 having different sizes even in a square or square shape, are provided.

  According to the burner unit 1 configured as described above, when used by being incorporated in the combustion chamber of a water heater, the mixture of fuel gas and combustion air supplied from the nozzle base 3 to each concentration burner 2 is respectively It is ejected from the pale flame mouth and the rich flame mouth and is ignited by an ignition means such as a discharge electrode to form a main flame and a sleeve fire. In particular, in the light and dark burner 2B, the flame F is formed from each of the flame ports 11 to 14 of the flame port plate 10, but the pressure distribution varies depending on the flame ports having different shapes and sizes on the flame port forming surface. Therefore, resonance energy is dispersed and combustion vibration can be suppressed.

  Thus, according to the light and dark burner 2B and the burner unit 1 of the above-described form, the light and dark burner 2B is assumed to be a random array of a plurality of types of flame outlets 11 to 14 having different shapes and sizes. By alternately arranging, generation of combustion vibrations in the combustion chamber can be effectively prevented. This effect can be achieved with a simple configuration in which the flame mouth plate 10 is provided in the light and dark burner 2B, so that the cost for preventing combustion vibration can be reduced.

Hereinafter, other forms of the light and dark burner 2B and the burner unit 1 will be described. However, since the other configuration including the burner unit is the same as that of the previous embodiment by changing only the shape of the flaming opening, only the relevant portion will be described and redundant description will be omitted.
In the form shown in FIG. 3, protrusions 17, 17... Having a cross-sectionally U-shaped cross section are formed on the flame mouth plate 16 of the light and dark burner 2 </ b> B at a predetermined interval. Flame ports 18, 18,... Are formed at predetermined intervals. Further, small holes 19 and 19 having an opening area smaller than that of the first flame port 18 are also opposed to each other on the left and right side walls of each protrusion 17 in accordance with the position of the first flame port 18 in the left-right direction in FIG. Drilled in position. The partition bar 20, 20,... Is fixed to the upper surface of the flame port plate 16 so as to cross the ridge 17 in an orthogonal shape so as to be between the first flame ports 18, 18. The second flame ports 21 and 21 are formed between the 17 and 17 in a square shape in plan view.

  Therefore, also in this light and dark burner 2B and the burner unit 1 in which this is alternately arranged, the mixture of the fuel gas and the combustion air is ejected from each first flame port 18 to form the flame F1, while each small burner The air-fuel mixture flowing between the ridges 17 and 17 from the hole 19 is ejected from each second flame port 21 to form a flame F2. In this case, the first flame port 18 and the second flame port 21 have different flame load (the flow rate at the second flame port 21 is slower than the flow rate at the first flame port 18), so Resonance is less likely to occur, and combustion vibrations can be effectively suppressed. In addition, this also requires a simple configuration in which the protrusion 17 is provided on the flame port plate 16 to bend the air-fuel mixture flow path, so that cost reduction can be expected.

  FIG. 4 shows a mode in which combustion vibration is similarly suppressed due to a difference in the flame load. In the light and dark burner 2B here, a circular first flame port 24 and a curved flame port plate 23, The circular second flame ports 25 having an opening area larger than that of the first flame port 24 are arranged alternately in the left and right directions, and an auxiliary plate 26 is attached to the back side of the flame plate 23. The auxiliary plate 26 is in contact with the rear surface of the flame port plate 23 except for the protrusions 27 and 27 that project downward corresponding to the rows of the first flame ports 24 and the second flame ports 25, respectively. The protrusion 27 that is fixed and corresponds to the row of the first flame ports 24 is provided with a through hole 28 that is coaxial with each first flame port 24 and has a larger opening area than the first flame ports 24. . On the other hand, in the protrusion 27 corresponding to the row of the second flame outlets 25, a pair of small holes 29, 29 are inclined toward the center side of the second flame outlet 25 for each second flame outlet 25. The air-fuel mixture flow path is bent and formed. Here, when the opening area of the first flame opening 24 is a1, the opening area of the second flame opening 25 is a2, the opening area of the through hole 28 is S1, and the total opening area of the pair of small holes 29 and 29 is S2. S1> a1 and S2 <a2.

  Therefore, also in this dark and light burner 2B and the burner unit 1 in which this is alternately arranged, the mixture of the fuel gas and the combustion air passes through the through hole 28 in the first flame port 24 and remains in the ridge 27 as it is. And go straight through the first flame outlet 24 to form a flame F1. On the other hand, in the second flame outlet 25, the air-fuel mixture enters the protrusion 27 so as to go around from the small holes 29, 29, and then ejects from the second flame outlet 25. Therefore, the flow rate at the second flame port 25 is slower than the flow rate at the first flame port 24, the flame load between the two flame ports is different, and resonance with the combustion chamber is difficult to occur, resulting in combustion vibration. Will be prevented.

Note that the shape of the flame mouth is not limited to the shape shown in FIG. 2, but other shapes such as a triangle, a rectangle, a polygon such as a pentagon and a hexagon, an ellipse, an ellipse, etc. can be adopted, and the arrangement form is only the shape Varying the pressure distribution on the flame front forming surface, such as arranging multiple types with different sizes regularly or irregularly, or arranging flame ports with different shapes and sizes completely at random including the pitch. If possible, it can be changed as appropriate.
Similarly, the difference in the flame load is not limited to the form shown in FIGS. 3 and 4. For example, the number and arrangement of the small holes on the second flame mouth side can be changed, or the first flame mouth and the second flame mouth can be changed. If the mixture ejection speed can be varied for each flame outlet depending on the presence or absence of bending of the mixture flow path, such as changing the shape as well as the size, various design changes can be considered.

On the other hand, in the above burner unit, the light and dark burners with different flame shape and load are arranged alternately with the normal light and dark burners, but multiple burners are arranged alternately or randomly. May be. Moreover, you may comprise all the light and dark burners with the light and dark burner which changed the shape of a flame mouth and the flame mouth load.
And in the said form, although it has become an example which applied this invention to the pale flame mouth of the light and dark burner, of course this invention is not limited to this, The normal Bunsen burner and its burner which do not divide the air-fuel mixture are used. Even a plurality of burner units coupled together can be applied.

It is explanatory drawing of a burner unit. It is explanatory drawing of the flame mouth part of a light-and-dark burner (upper is a plane, lower is a cross section). It is explanatory drawing of the example of a change of the flame-portion part of a light and dark burner (upper is a plane, lower is a cross section). It is explanatory drawing of the example of a change of the flame-portion part of a light and dark burner (upper is a plane, lower is a cross section).

Explanation of symbols

1 .. Burner unit, 2 (2A, 2B) .. Concentration burner, 3 .. Nozzle base, 4 .. Air supply fan, 5 .. Gas pipe, 6 .. Mixing section, 10, 16, 23. Mouth plate, 11-14 ... Flame port, 18, 24 ... First flame port, 21, 25 ... Second flame port.

Claims (4)

A burner having a plurality of flame outlets from which a mixture of fuel gas and combustion air is ejected,
In the flame mouth plate in which ridges having an inverted U-shaped cross section are formed at predetermined intervals, the first flame holes are provided on the upper surface of each ridge at predetermined intervals, while the first flame is formed on the left and right side walls of each ridge. In the position that becomes the left and right direction of the mouth, a small hole having a smaller opening area than the first flame mouth is formed, and a partition bar is fixed between the first flame mouths in a manner that crosses the protrusions in an orthogonal manner, A second flame mouth is provided between the ridges, and a flame load is applied between the first flame mouth and the second flame mouth depending on the presence or absence of bending of the mixture flow path leading to the first flame mouth or the second flame mouth. With different
The burner characterized by arranging said 1st flame mouth and said 2nd flame mouth at random. A burner having a plurality of flame outlets from which a mixture of fuel gas and combustion air is ejected,
On the curved flame mouth plate, the first flame mouth and the second flame mouth having a larger opening area than the first flame mouth are alternately arranged in the left-right direction, while an auxiliary plate is provided behind the flame mouth plate. Has been established,
The auxiliary plate is provided with a protrusion projecting backward corresponding to the first flame port and the second flame port, and the portion excluding the rib is fixed in a state of being in contact with the back surface of the flame port plate. In addition, a protrusion corresponding to the first flame port is provided with a through hole having a larger opening area than the first flame port at a position coaxial with the first flame port, while corresponding to the second flame port. The protruding ridge is provided with a pair of small holes inclined toward the center side of the second flame mouth for each second flame mouth, and the air-fuel mixture flow path leading to the first flame mouth or the second flame mouth Depending on the presence or absence of the first flame mouth and the second flame mouth, the flame load is different,
The burner characterized by arranging said 1st flame mouth and said 2nd flame mouth at random . A burner unit formed by integrally joining a plurality of burners according to claim 1 or 2 . A burner unit formed by integrally combining a plurality of burners each having a plurality of flame openings from which a mixture of fuel gas and combustion air is jetted,
A burner unit comprising the burners according to claim 1 arranged alternately or randomly.

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