JPS62102012A - combustion equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to combustion equipment using oil or gas as fuel.

BACKGROUND OF THE INVENTION Generally, in conventional oil and gas combustion equipment, various problems have occurred when combustion is controlled 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 bottomed cylindrical vaporizing cylinder, which is provided with discharge ports 2 for fuel and combustion air. A sheathed heater a is embedded in the outer periphery of the vaporization cylinder 1, and a vaporization cylinder lid having an opening 4a is screwed onto the top of the sheathed heater a. A pressure equalizing plate 5 having a plurality of small holes 5& is provided on the upper part of the vaporizing cylinder lid 4, and a flame holding plate 6 having a cylindrical shape with a ceiling and a flame port 6a on the side surface is provided on the outside of the pressure equalizing plate 5. It is attached by a bolt 9 provided at.

Further, a cylindrical wire mesh 8 is provided inside the flame port 6a of the flame holding plate 6.
is spotted. 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.

The operation of the first conventional example configured as described above will be described below. First, fuel and combustion air are supplied to the sheathed heater 3 in advance from the discharge port 2 provided in the vaporizer cylinder 1.
The gas is ejected into the vaporizer cylinder heated by the gas and vaporized. This premixed gas passes through the opening 4a of the vaporizer lid 4 and the small hole 5a of the pressure equalizing plate 5, and is ejected from the side flame port 6a of the flame stabilizing 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, it is necessary to
If the ejection speed of the premixed gas ejected from a is not suppressed, the flame will separate from the flame hole surface, causing lifting. Therefore, the opening area of the flame hole portion 6a 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
Since the wire mesh 8 is formed in close contact with the 0 surface and becomes red hot and reaches a considerably high temperature, there is a problem in terms of heat resistance, and there is a risk of deformation and breakage.

In addition, since the wire mesh 8 is provided on the inner surface of the flame holding plate 6,
The flame-holding plate 6 was heated red by the flames, which caused 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 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 vaporizing cylinder 11, and a burner plate 14 having an opening 14a in the center is screwed to the upper part of the sheathed heater 13.

A cylindrical outer peripheral surface 14b of the burner plate 14
A pressure equalizing plate 15 having a plurality of small holes 15a therein and a bottomed cylindrical burner cap 16 are attached to the top thereof by bolts 19 provided on the burner plate 14, respectively. At this time, the outer peripheral surface 14 of the burner plate 14
The upper end 17a of the wire mesh 17 closely attached to the burner cap 16 is covered by the folded lea of the burner cap 16, and the lower end 17b is fixed to the flange portion 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 vaporization section 11 into the vaporization cylinder 11 heated by the sheathed heater 13 and vaporized, becoming a premixed gas. . This premixed gas flows through the bottom opening 14a of the burner plate 14 and the small hole 15a of the pressure equalizing plate 15.
The wire mesh 1 is ejected from the flame hole 18 of the burner plate 14 through which it passes.
Form a flame on the surface of 7.

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 secondary mixed gas ejected from the flame hole 18 passes through the mesh to generate 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, 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, the lifting phenomenon does not occur during weak combustion, but the wire mesh 1
7 temperature tends to become high. 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 a high temperature 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 undergoes repeated expansion and contraction over time, causing distortion in a portion of the wire mesh. There is a sufficient risk of creating a gap between the outer circumferential surface 14b of the burner plate 14 and the wire mesh 17. Outer surface 1 of burner plate 14
When a gap is created between the burner plate 14 and the burner plate 14, 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 that the wire mesh becomes even hotter. Wire mesh 1 as the degree of redness increases
7 tends to swell. This poses 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 region.

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

The present invention solves the above-mentioned conventional problems, and improves the durability of the wire mesh and reduces combustion noise, thereby increasing the safety and comfort of combustion equipment.

9 Means to Solve the Problems In order to achieve this object, the combustion equipment of the present invention presses the burner plate from the outer circumferential direction to increase the adhesion between the burner plate and the wire mesh, and also presses the burner plate from the outer circumferential direction, and presses the wire mesh at the flame hole portion. It is hollowed out on the inside.

Effects The present invention has the above 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 created between the wire mesh and the burner plate, and combustion will be stabilized. At the same time, combustion noise is also significantly 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.

EXAMPLE An example 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 burner plate 1 is pressed from the outer circumferential direction of the wire mesh 17 attached closely to the outer circumferential surface 14b of the burner plate 14.
This improves the adhesion with 4.

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 2 inside the flame hole. It is .0. However, the upper E7 frame rod and the flame sensor which apply a potential between the outer circumferential surface 14b of the burner plate 14 and the flame rod (not shown) through the flame and measure the flame resistance to detect and operate the combustion state. The wire mesh 17, which is closely attached to the burner plate outer circumferential surface 14b at the portion facing each of the electrodes (not shown) of an igniter that is ignited by a discharge spark and starts combustion at the start of combustion, is not pressed from the outer circumferential direction. That's it.

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

First, during strong twist firing, the ejection speed of the premixed gas ejected from the flame holes 18 is high, and a main frame is formed in each flame hole 18, and at the same time, an auxiliary flow is generated through the mesh to form a subframe 1t-j.

Further, during weak combustion, the ejection speed of the premixed gas is slow, and the surface of the wire mesh 17 is formed to be inclined in both the main frame and the subframe.

Here, in this combustion equipment, the burner plate outer peripheral surface 14b
Since the wire mesh 17 is pressed from the outer circumferential direction, the following effects can be obtained. In other words, the adhesion of the wire mesh 17 to the burner plate outer peripheral surface 14b is improved, and if the lifeline 17
Even if strain occurs and the flame hole 18 attempts to swell, the wire mesh 17 at the flame hole 18 portion is recessed, so the recess 20 tends to deform inward. Therefore, the phenomenon of a gap occurring near the flame hole 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 actual results, a noise reduction of approximately 2 dB was confirmed. Also, flame hole 1
Since the eight portions of the wire mesh 17 are recessed, the main frame does not come into 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 located 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 will not come into close contact with the wire mesh 17 and will tend to separate and form, so the burner section at low temperatures (low temperature state) or when there is more air than fuel, etc. It is expected that it will be difficult to ignite due to the discharge spark of the large point electrode at the beginning of ignition. However, since the wire mesh 17 near the ignition part is not pressed, the wire mesh 17 in this area has the same shape as before and is difficult to lift, and the same ignition characteristics as before can be obtained. Similarly, the part of the flame sensor that detects the combustion state is not pressed, so it has the same shape as before.
Reliable operation with fewer malfunctions is possible.

Effects of the Invention As is clear from the 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 safe combustion equipment.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a combustion device in an embodiment of the present invention;
FIGS. 2 and 3 are cross-sectional views of conventional combustion equipment. 14...burner plate, 17...wire mesh, 18...flame hole, 20...gagging. Name of agent: Patent attorney Toshio Nakao and one other person empty!
″-to 0

Claims (2)

[Claims] (1) Combustion in which a wire mesh is closely attached to the outer peripheral surface of a burner plate having multiple 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. device. (2) The combustion device according to claim 1, wherein the wire mesh is pressed except for the portion facing the ignition electrode.