JPH0330048B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to combustion equipment using oil or gas as fuel.

Conventional technology Generally, in conventional oil and gas combustion equipment,
Various problems have occurred when combustion control is performed over a wide range from low calorie to high calorie. Two examples of conventional burners will be described below with reference to the drawings.

First, the first burner will be explained with reference to FIG. In FIG. 2, reference numeral 1 denotes a low cylindrical carburetor cylinder, which is provided with discharge ports 2 for fuel and combustion air. A sheathed heater 3 is embedded in the outer periphery of the vaporization cylinder 1, and a vaporization cylinder lid having an opening 4a is screwed to the upper part of the sheathed heater 3. A plurality of small holes 5a are provided in the upper part of the vaporizer cylinder lid 4.
A pressure equalizing plate 5 having a pressure equalizing plate 5 and a flame holding plate 6 having a cylindrical shape on the outside and having a flame port 6a on a side surface are attached to the vaporizing cylinder lid 4 by bolts 9, respectively. Further, a cylindrical wire mesh 8 is spotted inside the flame port 6a of the flame holding plate 6. A grounding plate 7 fitted to the side surface of the vaporizing cylinder 1 is attached to the outer periphery of the flame stabilizing plate 6.

Regarding the first conventional example configured as above,
The operation will be explained below. First, fuel and combustion air are ejected through a discharge port 2 provided in a vaporization cylinder 1 into a vaporization cylinder that has been previously heated by a sheathed heater 3, and are vaporized. This premixed gas is
It passes through the opening 4a of the vaporizer lid 4, the small hole 5a of the pressure equalizing plate 5, and is ejected from the side flame opening 6a of the flame holding plate 6. When a discharge spark is generated in the ejected premixed gas using an ignition electrode or the like, a flame is formed at the flame port 6a of the flame holding plate 6.

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 flame is ejected from the flame port 6a provided on the flame stabilizing plate. If the ejection speed of the premixed gas is not controlled, the flame will separate from the flame hole surface, causing lifting. Therefore, the flame hole part 6
The opening area of a must be made large. However, if the opening area of the flame hole portion 6a is increased, the ejection speed of the premixed gas will be slowed down during weak combustion, and the flame will be formed in close contact with the surface of the wire mesh 8, causing the wire mesh 8 to become red hot and reach a considerably high temperature. There is a problem with heat resistance, and there is a risk of deformation and damage.

Furthermore, since the wire mesh 8 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. Ta.

In order to solve the above 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 vaporizing cylinder, which is provided with a discharge port 12 for fuel and combustion air. A sheathed heater 13 is embedded in the outer periphery of the vaporization cylinder 11, and an opening 14a is formed in the center of the upper part of the sheathed heater 13.
The burner plate 14 is fixed with screws.
A pressure equalizing plate 15 having a plurality of small holes 15a in the cylindrical outer peripheral surface 14b of the burner plate 14.
and a low cylindrical burner cap 1 on the top.
6 are each attached by bolts 19 provided on the burner plate 14. At this time,
The upper end 17a of the wire mesh 17 closely attached to the outer circumferential surface 14b of the burner plate 14 is covered by the fold 16a of the burner cap 16, and the lower end 17b is fixed to the flange 11a of the vaporizing cylinder 11.

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

First, like the burner of the first conventional example described above, fuel and combustion air are ejected from the discharge port 12 provided in the carburetor 11 into the carburetor 11 heated by the sheathed heater 13 and vaporized, and the premixed gas becomes. This premixed gas passes through the bottom opening 14a of the burner plate 14 and the small hole 15a of the pressure equalizing plate 15, and is ejected from the flame hole 18 of the burner plate 14 to form a flame 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, since the wire mesh 17 is stretched over the outer circumferential surface of the flame hole 18, the premixed gas ejected from the flame hole 18 passes through the mesh to generate an auxiliary flow, forming 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, since the ejection speed of the premixed gas is slow, both the main frame and the subframe are formed on the surface of the wire mesh 17. Therefore, although the lifting phenomenon does not occur during weak combustion, the temperature of the wire mesh 17 is high and it is easy to do so. However, since the burner plate 14 on which the wire mesh 17 is stretched is located inside the flame and is constantly cooled by the premixed gas, the wire mesh 17 does not reach as high a temperature as in the first conventional example described above.

Problems to be Solved by the Invention However, in the burner configuration shown in the second conventional example, the wire mesh 17 expands over time.
There is a sufficient risk that distortion will occur in a portion of the wire mesh due to repeated contraction, and a gap will be created between the outer circumferential surface 14b of the burner plate 14 and the wire mesh 17. The outer peripheral surface 14b of the burner plate 14 and the wire mesh 1
7, a flame is formed in this gap, and a close flame is formed especially during weak combustion, reducing the cooling effect of the burner plate 14, so the wire mesh becomes hotter and red hot. As the number increases, the wire mesh 17 tends to swell. This causes a problem in the high temperature durability of the wire mesh 17, 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 14 from that part.

Furthermore, if a gap is created between the outer circumferential surface 14b of the burner plate 14 and the wire mesh 17, the area in which the subframe is formed becomes wider, resulting in louder combustion noise.

The present invention solves the above conventional problems,
This increases the durability of the wire mesh, reduces combustion noise, and improves the safety and comfort of combustion equipment.

Means for Solving the Problems In order to achieve this objective, the combustion equipment of the present invention has the following features:
The burner plate is pressed from the outer circumferential direction to increase the adhesion between the burner plate and the wire mesh, and the wire mesh in the flame hole portion is recessed inward.

Effects The present invention has the above-mentioned configuration, so that even if the wire mesh repeatedly expands and contracts due to temperature changes, distortion will not occur in a part of the wire mesh and a gap will not be generated between the wire mesh and the burner plate, and combustion will be prevented. Not only is it stable, but combustion noise is also greatly reduced.

Furthermore, since the wire mesh is recessed inside the flame hole, the flame does not come into close contact with the wire mesh, the temperature of the wire mesh decreases, and the problem with the durability of the wire mesh is resolved.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. Note that parts that are the same as those of the conventional example are given the same numbers and explanations are omitted, and only different parts will be explained.

The wire mesh 17 attached closely to the outer circumferential surface 14b of the burner plate 14 is pressed from the outer circumferential direction to improve its adhesion to the burner plate 14.
This press is performed by pressing a material such as urethane rubber against the wire mesh 17 at a pressing pressure of 5 kg/cm ² , and the portion of the wire mesh 17 facing the flame hole portion 18 has an arc-shaped depression 20 inside the flame hole. It is becoming. However, the flame rod and combustion sensor of the flame sensor which applies an electric potential through the flame between the outer peripheral surface 14b of the burner plate 14 and the flame rod (not shown) and measures the flame resistance to detect and operate the combustion state. The wire mesh 17, which is tightly attached to the outer peripheral surface 14b of the burner plate at the portion facing each of the electrodes (not shown) of the igniter that is ignited by a discharge spake to start combustion at the start, is not pressed from the outer peripheral direction. do.

The operation of the combustion equipment configured as above will be explained below.

First, 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, and at the same time, an auxiliary flow is generated through the mesh to form a subframe.

In addition, during weak combustion, the ejection speed of the premixed gas is slow, and the wire mesh 1
Formed on the surface of 7.

Here, in this combustion equipment, since the wire mesh 17 on the burner plate outer circumferential surface 14b is pressed from the outer circumferential direction, the following effects can be obtained. That is,
The adhesion of the wire mesh 17 to the outer circumferential surface 14b of the burner plate is improved, and even if the wire mesh 17 is strained and tries to swell, the wire mesh 17 in the flame hole 18 area is recessed, so that the recess 20 will not move inward. Trying to transform. Therefore, the occurrence of gaps near the flame holes 18 is reduced, and the adhesion of the wire mesh 17 can be increased. When the adhesion of the wire mesh 17 increases and no gaps are formed, the area of the subframe becomes narrower, and the combustion noise naturally becomes smaller than that of a conventional burner. According to the experimental results, a noise reduction of approximately 2 dB was confirmed. In addition, the wire mesh 1 of the flame hole 18 part
Since the main frame 7 is recessed, the main frame is not in close contact with the burner plate 14 but is formed apart from the burner plate 14, and the thermal influence from the main frame is reduced. Also, since the wire mesh 17 is recessed and located on the inside, it is greatly affected by the premixed gas, increasing the cooling effect and lowering the temperature of the wire mesh 17. Therefore, not only backfire etc. can be eliminated, but also the durability of the wire mesh 17 can be increased, and the risk of local deformation and breakage can also be eliminated.

By the way, as mentioned above, if the wire mesh 17 is recessed, the flame does not come into close contact with the wire mesh 17 and tends to form separately, so it is difficult to use flames in the burner section at low temperatures (when the temperature is low) or when the amount of air is large compared to the fuel. It is expected that ignition by the discharge spark of the ignition electrode will be difficult at the beginning of ignition. However, the wire mesh 17 near the ignition part
Since this part is not pressed, the wire mesh 17 in this part has the conventional shape and is difficult to lift, and the same ignition characteristics as in the conventional case can be obtained. Similarly, the flame sensor part that detects the combustion state is not pressed and has the same shape as before, allowing reliable operation with fewer malfunctions.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, it is possible to reduce combustion noise, lower the temperature of the wire mesh, stabilize combustion, and increase the durability of the wire mesh, etc. , it can be made into a comfortable and highly stable combustion equipment.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a combustion device according to an embodiment of the present invention, and FIGS. 2 and 3 are sectional views of conventional combustion devices. 14... Burner plate, 17... Wire mesh, 18
... Flame hole, 20 ... Hollow.

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 wire mesh is pressed inward from the outer circumferential direction to recess the wire mesh in the flame hole portion into the flame hole. Combustion equipment. 2. The combustion device according to claim 1, wherein the wire mesh is pressed at a portion other than the portion facing the ignition electrode.