JPH0210339B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a burner for combustion equipment using petroleum as fuel.

BACKGROUND OF THE INVENTION In recent years, there has been an urgent need for the development of burners capable of controlling combustion over a wide range from low calorie to high calorie in oil and gas combustion equipment.

Two examples of conventional burners will be described below with reference to the drawings.

FIGS. 2 and 3 are sectional views of a burner portion of a conventional combustion device.

First, regarding the first conventional burner, the second
This will be explained with reference to the figures.

In FIG. 2, reference numeral 1 denotes a bottomed cylindrical vaporizing cylinder, which is provided with discharge holes 2 for fuel and combustion air. A sheathed heater 3 is embedded in the outer periphery of the vaporization cylinder 1, and a central opening 4 is provided in the upper part of the sheathed heater 3.
A vaporizer cylinder lid 4 with a shape is placed thereon and fixed to the vaporizer cylinder 1 with screws. At the top of the vaporization cylinder lid 4, there is a pressure equalizing plate 5 having a plurality of small holes 5a, and a flame holding plate 6 having a cylindrical shape with a ceiling and having an opening 6a on the side surface.
are attached by bolts provided on the vaporizer cylinder lid 4, respectively. Further, the opening 6 of the flame holding plate 6
A cylindrical wire mesh 8 is spot welded to the inside of a. Attached to the outer periphery of the flame-holding plate 6 is a grounding plate 7 whose lower part fits into the side surface of the vaporizing cylinder 1 and whose upper part faces the opening 6a of the flame-holding plate 6.

Regarding the first conventional example configured as above,
The operation will be explained below.

Fuel and combustion air are ejected from a discharge hole 2 provided in the vaporization cylinder 1 into the vaporization cylinder 1, which has been heated in advance by a sheathed heater 3, and is vaporized. This premixed gas passes through the opening 4a of the vaporizer lid 4, the small hole 5a of the pressure equalizing plate 5, and the side opening 6a of the flame stabilizing plate 6.
More erupts. In this ejected premixed gas,
A flame is formed in the opening 6a of the flame holding plate 6 by generating a discharge spark using an ignition electrode or the like.

However, in the burner configuration as described above, in order to ensure a wide range of combustion from strong combustion with a large amount of combustion to weak combustion with a small amount of combustion, during strong combustion, the opening 6a provided in the flame stabilizing plate, that is, the flame hole If the ejection speed of the premixed gas ejected from the flame is not controlled, the flame will separate from the flame hole surface and cause lifting. Therefore, measures have been taken to increase the opening area of the flame hole portion 6a. However, when this opening area is increased, the ejection speed of the premixed gas becomes slower during weak combustion.
The flame is formed in close contact with the surface of the wire mesh 8, and the wire mesh 8
Because it becomes red hot and reaches a considerably high temperature, it has problems with heat resistance and can cause deformation and damage. Also, wire mesh 8
Since the flame holding plate 6 is provided on the inner surface of the flame holding plate 6, the flame holding plate 6 becomes red hot due to the flame, which causes not only deformation and damage of the wire mesh but also problems with the heat resistance of the flame holding plate 6.

In order to solve the above-mentioned problems, a burner as shown in FIG. 3 has been developed. Next, this second conventional burner will be explained with reference to FIG.

In FIG. 3, reference numeral 11 denotes a vaporization cylinder, which is provided with discharge holes 12 for fuel and combustion air. A sheathed heater 13 is embedded in the outer periphery of the vaporization tube 11, and a burner plate 14 with an opening 14a in the center is placed on top of the sheathed heater 13.
It is fixed with screws. The burner plate 14
A plurality of small holes 15 in the cylindrical outer peripheral surface 14b.
A pressure equalizing plate 15 having a pressure equalizing plate 15 and a burner cap 16 having a cylindrical shape with a bottom are attached to the upper part of the pressure equalizing plate 15 by bolts 19 provided on the burner plate 14, respectively. The outer circumferential surface 14b of the burner plate 14 is provided with a plurality of flame holes 18 divided into two upper and lower stages.

The operation of the second conventional example configured as described above will be described below.

Fuel and fuel air are ejected from a discharge hole 12 provided in the vaporization cylinder 11 into the vaporization cylinder 11 heated by a sheathed heater 13 and vaporized to become a premixed gas. This premixed gas passes through the bottom opening 14a of the burner plate 14, the small hole 15a of the pressure equalizing plate 15, and is ejected from the flame hole 18 of the burner plate 14.
A flame is formed on the surface of the wire mesh 17.

During strong combustion, the ejection speed of the premixed gas ejected from the flame holes 18 is high, and a main flame is formed in each flame hole 18 . At the same time, flame hole 18
Since a wire mesh 17 is stretched over the outer peripheral surface of the flame hole 18, the premixed gas ejected from the flame hole 18 passes through the mesh and generates an auxiliary flow, forming a subframe. This subframe has a slow ejection speed of the premixed gas and the wire mesh 17
Since it is formed as a surface, it has good flame stability. On the other hand, since the ejection speed of the premixed gas is slow during weak combustion, both the main frame and the subframe are formed on the surface of the wire mesh 17. Therefore, although no lifting phenomenon occurs during weak combustion, the temperature of the wire mesh 17 tends to increase. However, since the wire mesh 17 is stretched over the outer peripheral surface of the burner plate 14, the burner plate 14 is inside the flame surface and faces the premixed gas passage side.
It has a cooling effect. Therefore, the temperature of the wire mesh is not as high as in the first conventional example.

Problems to be Solved by the Invention However, in the burner configuration shown in the second conventional example, the wire mesh 17 is attached to the burner plate 14.
However, due to repeated expansion and contraction of the wire mesh over time, or due to assembly problems, a portion of the wire mesh may become strained, and the outer peripheral surface 14b of the burner plate 14 may become strained. There is a high risk of creating a gap between the two. If a gap is created between the wire mesh 17 and the outer circumferential surface 14b of the burner plate 14, during weak combustion, flames will form closer together, and the cooling effect of the burner plate 14 will also decrease, causing the wire mesh to become even hotter and red hot. increase. This poses a problem in the high temperature durability of the wire mesh, leading to local deformation and breakage, and finally, there is a risk of backfire combustion in which the flame is drawn into the burner plate from that region.

In view of the above-mentioned problems, the present invention provides a burner with high safety by increasing the durability of the wire mesh from the viewpoint of aging by closely fixing the wire mesh to the burner plate.

Means for Solving the Problems In order to solve the above-mentioned problems, the burner of the present invention has a wire mesh closely attached to the outer peripheral surface of the burner plate, and the entire lower end of the wire mesh is a carburetor flange, and the entire upper end is a burner tube flange. The burner plate is fixed with a cap and the flame holes drilled in the burner plate are divided so that they have a smaller area than the non-porous part. are spot welded at the center of the combustion surface.

Effects With the above-described configuration, the present invention prevents distortion from occurring in a part of the wire mesh due to repeated expansion and contraction due to temperature changes in the wire mesh, or problems during assembly, thereby preventing a gap from forming between the wire mesh and the burner plate. ,
Since the wire mesh is in close contact with the burner plate at all times, even if the flame is in close contact with the wire mesh during weak combustion, the burner plate still has a cooling effect and the problem with the durability of the wire mesh can be solved.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. Note that the same parts as in the conventional example are given the same numbers, detailed explanations are omitted, and only different parts will be explained.

The wire mesh 17 is attached closely to the outer circumferential surface 14b of the burner plate 14, and its upper end 17a is covered with the folded edge 16a of the burner cap 16, and its lower end 17b is fixed with the flange 11a of the vaporizing tube 11, and is bored into the burner plate 14. The flame holes 18 provided are divided so as to have a smaller area than the non-porous portion, and the flame holes 18 of the burner plate 14 are divided into upper and lower multi-stages 18a and 18b. Also wire mesh 1
7 is spot welded 20 at multiple points at the center of the upper and lower flame holes 18 provided in the burner plate 14.

With the above configuration, the premixed gas is ejected from the flame hole 18 of the burner plate 14 and the wire mesh 17
forms a flame on the surface of the During strong combustion, flame hole 18
The ejection speed of the premixed gas ejected from the main frame is high, and the main frame forms in each flame hole 18..., and at the same time, an auxiliary flow is generated through the mesh to form a subframe. This sub-frame has a slow ejection speed of the premixed gas and is formed of 17 wire mesh surfaces, so it has good flame stability.
On the other hand, during weak combustion, the ejection speed of the premixed gas is slow, so that the premixed gas is formed on the surface of the wire mesh 17 in both the main frame and the subframe. Therefore, the temperature of the wire mesh increases, but the upper end 17a of the wire mesh 17 is connected to the folded edge 16a of the burner cap 16, and the lower end 17b is connected to the vaporizing tube 1.
1, and spot weld the upper and lower central circumferential surfaces to the burner plate 14.
Therefore, the outer peripheral surface 14b of the burner plate 14
High adhesion with. Therefore, the heat capacity of the wire mesh 17 is small, and the cooling effect of the burner plate 14 that is in close contact with it is large, and the temperature of the wire mesh is further reduced. Further, the lower end 17b of the wire mesh 17 is connected to the flange 11 of the vaporizing tube 11 made of die-cast aluminum with high thermal conductivity.
Since it is fixed at a, the flange 1 of the vaporizing cylinder 11
The temperature of the wire mesh further decreases due to the cooling effect of 1a. Furthermore, since the upper and lower central outer circumferential surfaces of the wire mesh 17 are spot welded 20 to the burner plate 14, thermal interference between the upper and lower stages of the flame hole 18 can be reduced, the temperature of the wire mesh 17 is further reduced, and the wire mesh 1
Since the expansion and contraction of wire mesh 7 is divided into two in the vertical direction, deformation and distortion of wire mesh 17 due to temperature changes can be minimized, and temperature rise due to red heat can be prevented. Furthermore, since the upper end 17a of the wire mesh 17 is fixed by the folded edge 16a of the burner cap 16, even if the premixed gas leaks from the folded edge 16a of the burner cap, the premixed gas will pass through the mesh and reach the subframe. This prevents the generation of odors, soot, etc. due to incomplete combustion.

Effects of the Invention As described above, in the present invention, a wire mesh is closely attached to a burner plate, the lower end of the wire mesh is fixed all around by the flange of the carburetor cylinder, and the upper end is fixed all around by the burner cap to form a combustion surface. The flame holes of the burner plate are divided into multiple stages so that the area is smaller than the non-porous part, and the burner plate and the wire mesh are welded at the center of the combustion surface. The heat resistance of the burner can be improved, the range of calorie variation can be expanded, and the generation of odor and soot due to leakage of premixed gas can be prevented, thereby providing a burner that is highly safe and comfortable. The flame holes drilled in the burner plate have a smaller area than the non-porous part,
In addition, since it is divided into multiple stages, the cooling effect of the wire mesh is large, the durability of the wire mesh is improved, and the weakly burned calories can be lowered, making it possible to obtain a burner with a wide range of calorie variation.

In addition, since the flame holes are divided into multiple stages, a subframe is formed between the flame holes, preventing lifting due to flame interference and widening the combustion range. Furthermore, since the upper end of the wire mesh is covered with the folded edge of the burner plate all around the perimeter, even if premixed gas leaks from this folded edge, the premixed gas will pass through the mesh and form a subframe, resulting in incomplete combustion. It is possible to prevent the generation of odors, soot, etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a burner section according to an embodiment of the present invention, and FIGS. 2 and 3 are sectional views of a conventional burner section. 11... carburetor cylinder, 11a... carburetor flange,
14... Burner plate, 16... Burner cap, 16a... Folded edge, 17... Wire mesh, 18...
Flame hole.

Claims (1)

[Claims] 1. A wire mesh is closely attached to the outer peripheral surface of a burner plate having a plurality of flame holes, and the entire lower end of the wire mesh is fixed with a flange of a stoma tube, and the entire upper end is fixed with a burner cap so that the combustion surface form,
The burner plate is provided with flame holes divided so as to have a smaller area than the non-porous part, and the flame holes of this burner plate are divided into upper and lower stages, and the burner plate and wire mesh are arranged in the center of the combustion surface. Welded oil burning equipment.