JPH0210340B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a burner for a combustor such as an oil fan heater.

BACKGROUND OF THE INVENTION In recent years, there has been a demand for burners in oil and gas combustion equipment that can control combustion over a wide range from low calorie to high calorie. An example of a conventional burner will be described with reference to the drawings. FIGS. 3 and 4 are cross-sectional views showing the main parts of a conventional burner. In FIG. 3, 1 is a cylindrical burner plate having a canopy, a flame hole 2 is provided on the side surface, and a wire mesh 3 is provided on the inner surface of the side surface of the burner plate 1. FIG. 4 shows another conventional example, in which a burner plate 4 is provided with flame holes 5 and a wire mesh 6 is wrapped around the outer surface of the burner plate.

Problems to be Solved by the Invention In order to achieve combustion from strong combustion with a large combustion amount to weak combustion with a small combustion amount in such a burner configuration, it is necessary to suppress the ejection speed of the premixed gas ejected from the flame hole during strong combustion. If the flame lifts from the flame hole surface. For this purpose, measures have been taken to increase the opening area of the flame holes 2 and 5. However, if this opening area is made large, the ejection temperature of the premixed gas decreases during weak combustion, and flames are formed on the surface of the wire mesh as shown in FIGS. 3A and 4B.
becomes red hot and reaches a considerably high temperature, causing problems in terms of heat resistance, resulting in deformation and breakage. Especially the third
In the conventional example shown in the figure, since the wire mesh 3 is provided on the inner surface of the burner plate 1, the burner plate 1 is heated by the flame A, causing not only deformation and damage of the wire mesh but also heat resistance problems of the burner plate 1. It was hot.

In view of the above-mentioned problems, the present invention solves the lifting phenomenon and heat resistance problems of wire mesh, etc., from strong combustion with a large amount of combustion to weak combustion with an extremely small amount of combustion, and allows combustion to be adjusted in a wide range. It provides a burner.

Means for Solving the Problems Therefore, in the combustion equipment of the present invention, a wire mesh is inserted almost tightly around the outer periphery of the burner plate, and the total area of flame holes is smaller than the non-porous area on the combustion surface of the burner plate. The flame hole is divided into a plurality of small flame holes and the flame hole is divided into upper and lower parts so that the area of the lower flame hole is larger than the area of the upper flame hole, and the lower end of the wire mesh is made of aluminum vaporizing tube. The structure is such that it is covered with

Effects By adopting the above configuration of the present invention, supplementary flame is formed around the main frame formed in each flame hole during strong combustion, the flame holding of the main frame is strengthened, and lifting is less likely to occur. Furthermore, during weak combustion, a flame is formed on the surface of the wire mesh facing the flame hole, but since the wire mesh is in close contact with the burner plate, it is cooled by the burner plate and the temperature of the wire mesh can be kept low. In addition, the flame holes drilled in the burner plate have a smaller area than the non-perforated part and are divided into many parts, so the cooling effect of the wire mesh is large. Since the lower end of the wire mesh near the hole is covered with an evaporation cylinder, it is cooled by this evaporation cylinder and its durability is improved. Furthermore, among the flame holes divided into upper and lower sections, the opening area of the lower flame hole is increased, so that the amount of intense combustion can be increased.

Embodiment An embodiment of the present invention will be described below with reference to FIG. Reference numeral 7 denotes a burner plate, which has a plurality of flame holes 7a and 7b divided into two upper and lower stages on its side surface. The diameter d of the flame hole 7a is the flame hole 7
The diameter of the flame holes 7b is smaller than the diameter D of the flame holes 7b, and the flame hole area is also provided so that the total area of the flame holes 7b in the lower row is larger than the total area of the flame holes 7a. Reference numeral 8 denotes a wire mesh inserted tightly into the outer peripheral surface of the burner plate 7, and the wire mesh 8 and the burner plate 7 are spot-welded at multiple points in the center between the upper flame hole 7a and the lower flame hole 7b of the burner plate 7. , the adhesion between the wire mesh 8 and the burner plate 7 is further improved. Further, the upper and lower ends of the wire mesh 8 are shorter than the dimensions of the burner plate 7, and an expansion allowance l is expected. A burner cap 9 covers the upper end of the wire mesh 8 and closes the upper end opening of the burner plate 7. Reference numeral 10 denotes a vaporizing cylinder made of a die cast aluminum product into which a heater 11 is cast.The upper end flange portion 12 of the vaporizer cylinder covers the lower end of a wire mesh 8, and a burner plate 7 is placed thereon. 13 is a gas passage closed at the bottom of the burner plate 7, 14 is a small hole 15
16 is a burner stopper screw, and 17 is a discharge port for fuel and combustion air. Between the flange 12 of the carburetor 10 and the burner plate 9 is a main frame 18 and a combustion surface S forming an auxiliary flame 19.
Flame holes 7a and 7b are bored at positions facing the combustion surface S of the burner plate 7, and a non-porous portion 7c is located, but in this combustion surface S, the total area of the flame holes 7a and 7b is equal to that of the non-porous portion. Divided flame holes are drilled so that the area is smaller than the total area of 7c.

Next, its operation and effect will be explained. The fuel ejected from the combustion and air discharge port 17 becomes a premixed gas in the heated vaporization cylinder 10, passes through the gas passage 13 and the pressure equalization plate 15, and then enters the flame hole 7a of the burner plate 7.
The flame is ejected from 7b and forms a flame on the surface of wire mesh 8.
During strong combustion, the ejection velocity of the premixed gas ejected from the flame holes 7a and 7b is fast, and as shown in FIG.
8,18' are formed from individual flame holes. Also,
Since a wire mesh 8 is tightly wound around the outer peripheral surfaces of the flame holes 7a and 7b, an auxiliary flow is generated through the mesh around the main flow facing the flame holes, thereby forming auxiliary flames 19 and 19'. This auxiliary flame has a slow gas ejection speed and is formed on the surface of the wire mesh 8, so it is not blown away and has good flame stability. In this way, during strong combustion, stable auxiliary flames 19, 19' are formed around the main frames 18, 18', and stable combustion can be obtained without lifting of the main frames. Further, during strong combustion, the main frames 18, 18' form flames relatively far from the wire mesh surface, so the wire mesh 8 is hardly heated to red.

On the other hand, during weak combustion, the ejection speed of the premixed gas becomes slow, so that both the main frames 18, 18' and the auxiliary flames 19, 19' burn on the surface of the wire mesh 8, as shown in FIG. Therefore, although no lifting phenomenon occurs during weak combustion, the wire mesh 8 and the flame holes 7a, 7
The temperature of parts such as b tends to rise. However, since the wire mesh 8 is inserted almost tightly into the burner plate 7, the heat capacity of the wire mesh 8 is small and is cooled by the burner plate 7 that is in close contact with it.
There is no need to raise the temperature of the wire mesh to an extreme level. Further, since the wire mesh 8 is wound around the outer peripheral surface of the burner plate 7, the burner plate 7 is located inside the flame surface, facing the mixed gas passage side and on the cooling side. Furthermore, in the range of the combustion surface S, the area of the non-porous part is larger than the flame hole area of the burner plate 7.
Moreover, since it is composed of divided flame holes 7a and 7b, a sufficient cooling effect of the wire mesh 8 can be obtained. Also,
Since the lower ends of the burner plate 7 and the wire mesh 8 are covered with the flange 12 of the die-cast aluminum vaporizing cylinder 10 with good thermal conductivity, the deformation and high-temperature durability of the wire mesh 8 are further improved. In this burner, the flame holes 7a and 7b of the burner plate 7 are such that the upper flame hole 7a is smaller than the lower flame hole 7b. This is because the flame holes 7a in the upper stage are more likely to be heated than the lower stage, and the temperature of the wire mesh 8 is likely to increase. Further, as described above, the lower flame hole 7b side is easily cooled by receiving heat from the flange 12 of the vaporizing tube 10, so even if the lower flame hole is enlarged, the temperature of the wire mesh 8 is difficult to rise. For this reason, by making the lower flame hole 7b larger than the upper flame hole 7a, it is possible to eliminate vertical temperature unevenness and maintain balance. On the other hand, how much flame hole area can be secured within the same combustion surface S depends on how high the intense combustion amount of the burner can be obtained.In this way, the upper and lower flame holes 7a and 7b are balanced. By taking this value, a large amount of combustion can be achieved with a small burner. Also, the flame hole 7 between the upper and lower stages
Wire mesh 8 and burner plate 7 in the center of a and 7b
By spot welding, it is possible to improve the adhesion effect between the wire mesh 8 and the burner plate 7, and to reduce thermal interference between the upper and lower stages of the flame hole, lowering the temperature of the wire mesh and improving durability. Further, since the burner plate 7 is spot welded at the center, the expansion of the wire mesh 8 is divided into two parts in the vertical direction, and a reasonable expansion relief margin can be obtained. Furthermore, in this embodiment, the bottom surface of the burner plate 7 is integrally tightened to form the gas passage 13, so that parts can be rationalized, the cooling effect of the burner plate 7 is promoted, and the temperature of the wire mesh 8 is reduced. can be lowered.

Effects of the Invention As described above, the present invention includes attaching a wire mesh to the outer circumferential surface of a burner plate in close contact with the outer circumferential surface of the burner plate, dividing the flame hole so that the flame hole area is smaller than the non-porous area of the burner plate, and This flame hole is divided into upper and lower halves, making the area of the lower flame hole larger than the area of the upper flame hole, and the lower end of the wire mesh near the lower flame hole is covered with an aluminum vaporizing tube, increasing the amount of intense combustion. At the same time, it prevents lifting during strong combustion, and prevents excessive heating of the wire mesh and flame hole during weak combustion, making it possible to obtain stable combustion over a wide range from strong to weak.

[Brief explanation of drawings]

FIG. 1 is a half-cut side sectional view of a combustion device showing an embodiment of the present invention, FIG. 2 is a half-cut side sectional view during weak combustion, and FIGS. 3 and 4 are half-cut side sectional views of a conventional example. be. 7...burner plate, 7a, 7b...flame hole,
8...wire mesh, S...combustion surface, 7c...non-porous part.

Claims (1)

[Scope of Claims] 1. A burner plate having a plurality of flame holes on its outer circumferential surface, a wire mesh attached to the outer circumferential surface of the burner plate in almost intimate contact with the burner plate, and a wire mesh attached to the burner plate so as to cover the lower end of the wire mesh. The burner plate has flame holes divided into sections having a smaller area than the non-porous portion, and the flame holes of the burner plate are divided into upper and lower stages, and the burner plate has flame holes divided into upper and lower stages. The combustion device has a flame hole area larger than that of the upper flame hole. 2. The combustion device according to claim 1, wherein the burner plate and the wire mesh are spot welded at the upper and lower center of the combustion surface. 3. The combustion device according to claim 1, wherein the lower end of the burner plate is integrally formed into a tight shape, and a convex gas passage is formed on the side of the vaporizer cylinder.