JPH0686923B2 - Combustion device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to burners for combustion equipment.

2. Description of the Related Art As shown in FIG. 2, a conventional combustion apparatus of this type includes a burner head 1 provided with flame holes 2 and an inner surface of the burner head 1 provided with a wire net 3. FIG. 3 shows another conventional example in which a flame hole 2 is provided in a burner head 1 and a wire net 3 is wound around the outer surface of the burner head 1.

(For example, Japanese Utility Model Laid-Open No. 58-122817 and Japanese Utility Model Laid-Open No. 59-18121) Problems to be Solved by the Invention However, with the above-mentioned configuration, it is difficult to control combustion over a wide range from low calorie to high calorie. there were. That is, in order to burn from strong combustion with a large combustion amount to weak combustion with a small combustion amount, the flame A causes lifting from the surface of the flame hole 2 unless the ejection speed of the premixed gas ejected from the flame hole 2 at the time of strong combustion is suppressed. For that reason, means for increasing the opening area of the flame hole 2 has been taken. However, if this opening area is made large, the jet speed of the premixed gas decreases at the time of weak combustion, and the flame A is formed on the surface of the wire net 3 so that the wire net 3 becomes red hot and becomes a considerably high temperature, causing a problem in heat resistance. , Will be deformed or damaged. In particular, in the conventional example shown in FIG. 2, since the wire net 3 is provided on the inner surface of the burner head 1, the burner head 1 is heated by the flame A and the wire net 3
In addition to the deformation and damage of the burner head 1, there was a problem of heat resistance of the burner head 1.

The present invention solves such a conventional problem and solves heat-resistant problems such as lifting phenomenon and wire mesh from a large combustion amount of strong combustion to an extremely small combustion amount of weak combustion, and burns in a wide range. The purpose is to provide an adjustable burner.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention has a plurality of flame holes, a burner head sandblasted on the surface, a wire mesh is closely attached is there.

Action The present invention has the above-described structure to improve the adhesion between the burner head and the wire net, and facilitates the heat of the wire net surface to be transferred to the burner head, while sandblasting improves the emissivity of the burner head and improves the combustion surface. The heat resistance of the wire mesh surface is improved by lowering the temperature. As a result, the wire mesh is prevented from being deformed or damaged, and it is possible to provide a combustion device with a wide range of adjustment of the combustion amount.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

1, a burner head 1 made of stainless steel has a plurality of flame holes 2 formed therein. Reference numeral 3 is a wire mesh closely attached to the outer peripheral surface of the burner head 1. Further, since the sandblast 4 is applied to the outer surface of the burner head 1, the number of contact points between the burner head 1 and the wire net 3 is increased, and the adhesion is improved. The surface of the burner head 1 is formed by sandblasting 4 with unevenness having an average roughness of 0.5 to 5 μm. A burner cap 5 covers the upper end of the wire mesh 3 and closes the upper end opening of the burner head 1. Reference numeral 6 is a vaporization cylinder of a die-cast molded product made of amyl in which a heater 7 is cast, and its upper end flange portion 8 covers the lower end of the wire net 3 and the burner head 1 is placed thereon. 9 is a gas passage in which the bottom of the burner head 1 is narrowed, 10 is a burner stop screw, 11
Is a fuel nozzle, and 12 is a discharge port of combustion air. Between the vaporization cylinder flange portion 8 and the burner cap 5 is a combustion portion C that forms a flame A and an auxiliary flame B.

In the above structure, the fuel and air ejected from the fuel nozzle 11 and the air discharge port 12 become a premixed gas in the heated vaporization cylinder 6 and pass through the gas passage 9 to eject from the flame hole 2 of the burner head 1 Form a flame on the surface. During strong combustion, the ejection speed of the premixed gas ejected from the flame hole 2 is high,
The flame A has individual flame holes 2 in the mainstream of the premixed gas facing the
Formed from. Further, since the wire mesh 3 is closely wound on the outer peripheral surface of the flame hole 2, an auxiliary flow is generated around the premixed gas main flow facing the flame hole 2 through the mesh of the wire mesh 3 to form an auxiliary flame B. . This auxiliary flame B has a low pre-mixed gas ejection speed and is not blown off because a flame is formed on the wire mesh surface, and has a good flame holding property. Thus, during strong combustion, a stable auxiliary flame B is formed around the flame A, and stable combustion is obtained without causing lifting of the flame A. However, when a large number of flame holes 2 are installed in the small holes, the influence of the auxiliary flame B is strong, and since the auxiliary flame B is easily formed in the vicinity of the wire net 3, the temperature of the wire net 3 tends to be high. On the other hand, when the combustion is weak, the amount of combustion itself decreases, so heat conduction and radiation heat release
Temperature does not rise much. In this embodiment, since the wire netting 3 is closely attached to the burner head 1 and the burner head 1 is sandblasted 4, the adhesion between the burner head 1 and the wire netting 3 is improved, and the surface of the wire netting 3 is improved. The heat is easily conducted to the burner head 1, and the temperature of the wire netting 3 does not rise extremely. This is because the wire mesh 3 is wound around the outer peripheral surface of the burner head 1, so that the burner head 1 is located inside the flame A surface, faces the passage side of the premixed gas, and is located on the cooling side. This is because it can be obtained sufficiently. Moreover, the amount of radiation from the surface of the burner head 1 is significantly increased by sandblasting 4, and the emissivity is 50 to 80.
As a result, the temperature of the combustion surface is lowered and the durability of the wire net 3 is greatly improved. At this time, it is possible to maximize the emissivity by setting the average roughness of the surface roughness of the surface of the burner head 1 by the sandblast 4 to 2 to 3 μ (50 to 80 μm).
%), When the average roughness is 5 μ or more, it becomes 40% or less, which is no different from an untreated smooth plate. Also, the tendency tends to be the same at 0.5 μ or less. Furthermore, since the lower end of the burner head 1 wire mesh 3 is covered with the die-cast vaporization cylinder flange portion 8 made of aluminum having good thermal conductivity, the deformation of the wire mesh 3 is further suppressed and the high temperature durability is improved.

Effects of the Invention As described above, the combustion device of the present invention has the following effects.

(1) It is possible to provide a combustor with a wide range of adjustment of combustion amount from strong combustion to weak combustion by preventing excessive heating of wire nets and flame holes.

(2) The durability and durability of the burner head and wire mesh are improved,
Stable combustion can be obtained for a long time.

(3) Stability of flame is released and combustion characteristics are remarkably improved.

(4) Flame is dispersed by the formation of auxiliary flame, the load of flame hole is reduced, and the temperature of the atmosphere near the wire mesh is reduced by the action of sandblast, so the flame temperature is reduced and nitrogen oxides (NOx) Is significantly reduced.

(5) Spot welding is available to improve the adhesion between the burner head and the wire mesh and to prevent misalignment.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a combustion apparatus according to an embodiment of the present invention, and FIGS. 2 and 3 are sectional views of an essential part of a conventional combustion apparatus. 1 ... Burner head, 2 ... Flame hole, 3 ... Wire mesh, 4 ...
Sandblasted surface, A ... Flame, B ... Auxiliary flame.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 61-276613 (JP, A) JP 61-289217 (JP, A) JP 61-295406 (JP, A) JP 56- 3815 (JP, A) Actual opening Sho 57-87926 (JP, U) Actual opening Sho 58-175335 (JP, U) Actual opening Sho 58-175336 (JP, U)

Claims (2)

[Claims] 1. A combustion apparatus in which a wire net is closely attached to a burner head having a plurality of flame holes and whose surface is sandblasted. 2. The combustion apparatus according to claim 1, wherein the surface of the burner head is formed by sand blasting to form uneven irregularities having an average roughness of 0.5 to 5 μm.