JP2671324B2 - Burner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a burner used for a fan heater, a stove, or the like. Conventional technology Conventionally, as a burner such as a fan heater or a stove, a wire net is provided in a burner head or a burner head flame hole portion,
There was something that formed a flame near the wire mesh. Such burners burn fuel and air with partial premixing, first burning,
Air was obtained downstream of the flame to complete combustion. Problems to be Solved by the Invention However, in such a burner, when the combustion amount is increased, the flame is easily blown off, and the burner has a variable range (hereinafter, referred to as TDR).
There is a problem that it is narrow. Further, there is a problem that the combustion on the primary side is easily disturbed by the secondary air due to the partial premixed combustion. The present invention provides a burner having a wide TDR and easy to independently control combustion on the primary side and the secondary side. Means for Solving the Problems In order to solve the above problems, the present invention forms a pair of flames by forming a pair of primary combustion chamber walls having a plurality of flame holes, facing each other at a constant distance. The holes are also coaxially opposed to each other, and a gas mixture branch pipe is provided on the gas mixture upstream side of the primary combustion chamber so that the flame holes are located at the outlet of the gas mixture supply passage communicating the primary combustion chamber and the gas mixture branch pipe. Allow the air to pass through the outer periphery of the air-fuel mixture supply path, form a secondary combustion chamber by facing the secondary combustion chamber wall on the downstream side of the combustion gas, and face the secondary combustion chamber wall on the same plane. In addition, a plurality of air holes are provided, and a partition plate is provided so as to reduce a combustion gas passage area between the primary combustion chamber and the secondary combustion chamber. Action With the above configuration, the opposing flame is formed in the combustion chamber, the flow velocity is reduced at the flame collision part, and the stability of the flame can be improved. It gets harder. Furthermore, since the secondary air does not easily flow into the primary combustion chamber, it does not disturb the combustion on the primary side. Example Hereinafter, a specific description will be given with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a vertical sectional view of the burner. Regarding the burner, the primary combustion chamber wall 1, the side plate 2, and the bottom plate 3 form a primary combustion chamber 4, but the two primary combustion chamber walls 1 are provided so as to face each other. Further, the primary combustion chamber wall 1 is provided with a plurality of flame holes 5, and like the primary combustion chamber wall 1, the flame holes 5 face each other. An air-fuel mixture branch pipe 6 is provided on the upstream side of the air-fuel mixture in the primary combustion chamber 4, and the flame holes 5 form the primary combustion chamber 4 and the air-fuel mixture branch pipe 6.
Is located at the outlet of the air-fuel mixture supply path 7 that communicates with the. Further, on the downstream side of the combustion gas, the secondary combustion chamber wall 8 is opposed to form a secondary combustion chamber 9, and the secondary combustion chamber wall 8 is provided with a plurality of air holes 10 opposed to each other on the same plane. It is provided.
A partition plate is provided between the primary combustion chamber 4 and the secondary combustion chamber 9.
11 are installed. Further, on the upstream side of the mixture branch pipe 6, there are a throat 12, a vaporization chamber 13, and a vaporization cylinder 14, and the vaporization cylinder 14
A sheathed heater 15 is provided in the. An air passage 16 communicates with the vaporization cylinder 14, and a fuel injection nozzle 17 is provided inside.
There is. The secondary air chamber 18 is communicated with the secondary combustion chamber 9. The above is the configuration when liquid fuel is used. However, when gas fuel is used, the vaporization cylinder 14 becomes unnecessary and the throat From 12, the downstream side can be used with the same configuration as when using liquid fuel. Next, the operation will be described. First, the sheath heater 15 is energized to heat the vaporization cylinder 14, and then the fuel 19 is jetted from the fuel jet nozzle 17. Then, the fuel 19 collides with the vaporizing cylinder 14, vaporizes, and the primary air 20 sent at the same time is sent.
After mixing with the mixture, it passes through the throat 12 and becomes a uniform mixture 21. After that, the mixture moves to the mixture branch pipe 6, passes through a plurality of pipe-shaped mixture supply passages 7, and is supplied to the primary combustion chamber 4 from the flame holes 5 coaxially opposed to each other.
Form 22. Subsequently, the secondary flame 24 is formed by the secondary air 23 supplied from the air holes 10 provided in the secondary combustion chamber wall 8, and the secondary flame 24 is completely burned and then discharged. The primary-side opposing flame 22 thus formed has a low flow velocity at the flame collision portion of the primary combustion chamber 4 and stabilizes the flame by forming a stagnation region. Therefore, even if the combustion amount and the air ratio are large, the flame is less likely to blow off as compared with the conventional burner. On the other hand, when the combustion amount or the air ratio becomes smaller, the flame enters the flame hole 5 and tries to backfire. However, since the primary combustion chamber wall 1 and the air-fuel mixture supply path 7 are cooled by the cooling air 25, the flame can be stably burned near the flame holes 5 without backfire. Therefore, as a burner, TDR
Can be widened. Further, when the primary-side opposing flame 22 is separated from the flame hole 5, carbon monoxide (CO) is partially generated from the vicinity of the flame hole 5, but since a large number of flame holes 5 are arranged, the generated CO Are oxidized by the adjacent primary-side opposing flame 22. Therefore,
Even if the primary side opposing flame 22 separates from the flame hole 5, the exhaust gas characteristic does not deteriorate as a burner. Further, after the primary side opposing flame 22 is formed, the secondary flame 24 is formed by the secondary air 23 supplied from the air holes 10 provided in the secondary combustion chamber wall 8. At this time, the primary combustion chamber 4 Since the partition plate 11 is provided between the secondary combustion chamber 9 and the secondary combustion chamber 9, the secondary air 23 does not enter the primary combustion chamber 4 and disturbs combustion on the primary side. It is possible to perform stable secondary combustion without having to do so. Also, the partition plate 11
Since the temperature near the outlet of the primary combustion chamber 9 can be raised to high temperature, the CO oxidation treatment function is excellent, and the CO value is 1% compared to the case where the partition plate 11 is not provided in the experiment. / 2
It was confirmed that it could be reduced to the following. Partition board like this
Providing 11 improves the combustion on the primary side and separates the combustion on the primary side from the combustion on the secondary side.
It is easy to control the length and shape of 24, and it is easy to perform stable combustion as a burner even when a heat exchanger or the like is provided on the downstream side. It should be noted that the combustion on the primary side is not limited to an air ratio of 1 or less, and the same effect can be achieved if the air ratio is 1 or more. Effects of the Invention As described above, according to the burner of the present invention, the following effects can be obtained. By forming the opposing flame and cooling it to the upstream side of the flame hole, it is possible to suppress the blow-off and backfire of the flame and to widen the TDR.
In addition, by providing a partition plate between the primary combustion chamber and the secondary combustion chamber to reduce the passage area of the combustion gas, the CO oxidation treatment function is improved, combustion on the primary side is improved, and primary Since the combustion on the secondary side and the combustion on the secondary side can be separated, it is easy to control the length and shape of the secondary flame, and even when a heat exchanger is provided, it is easy to achieve stable combustion as a burner.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a burner showing an embodiment of the present invention, and FIG.
The figure is a vertical sectional view of the burner. 1 ... Primary combustion chamber wall, 5 ... Flame hole, 6 ... Mixture branch pipe, 7 ... Mixture supply device, 8 ... Secondary combustion chamber wall, 10 ...
Air vents, 11 ... partition plates, 14 ... vaporization tubes.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Okamoto ▲ Ken ▼ ya               Matsushita, 1006 Kadoma, Kazuma, Osaka               Kiki Sangyo Co., Ltd. (72) Inventor Kenkichi Hashido               Matsushita, 1006 Kadoma, Kazuma, Osaka               Kiki Sangyo Co., Ltd.                (56) Reference JP-A-52-23736 (JP, A)                 Actual Development Sho 55-3186 (JP, U)                 52-49932 (JP, U)

Claims (1)

(57) [Claims] A pair of primary combustion chamber walls having a plurality of flame holes are made to face each other at a constant distance to form a primary combustion chamber, and the pair of flame holes are also made to face each other coaxially, and mixed to the upstream side of the air-fuel mixture in the primary combustion chamber. An air branch pipe is provided so that the flame hole is located at the outlet of the air-fuel mixture supply passage that communicates the primary combustion chamber and the air-fuel mixture branch pipe, and air can pass through the outer periphery of the air-fuel mixture supply passage. On the downstream side of the combustion gas, the secondary combustion chamber walls are opposed to each other to form a secondary combustion chamber, the secondary combustion chamber wall is provided with a plurality of air holes opposed to each other on the same surface, and the primary combustion chamber and A burner characterized in that a partition plate is provided so as to reduce a combustion gas passage area between the secondary combustion chambers.