JPH0427441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustor fueled by oil or gas.

BACKGROUND OF THE INVENTION In conventional oil and gas combustors, various problems have occurred when the amount of combustion is adjusted within the range from low calorie to high calorie. This will be explained below with reference to the drawings.

First, a conventional burner will be explained with reference to FIG.

In FIG. 3, reference numeral 1 denotes a carburetor cylinder, which is provided with a discharge port 2 for fuel and combustion air. A sheathed heater 3 is embedded in the outer periphery of the vaporizing cylinder 1, and a burner body 4 having an opening 4a in the center is screwed to the upper part of the sheathed heater 3. A pressure equalizing plate 5 having a plurality of small holes 5a in the cylindrical outer circumferential surface 4b of the burner body 4, and a bottomed cylindrical burner cap 6 on the top thereof are each attached by bolts 9 provided on the burner body 4. It is being At this time, the upper end 7a of the wire mesh 7 closely attached to the outer circumferential surface 4b of the burner body 4 is covered by the folded back 6a of the burner cap 6, and the lower end 7b is fixed by the flange portion 1a of the vaporizing cylinder 1.

In the conventional combustor configured as described above, the fuel and combustion air that have flowed into the vaporization cylinder 1 are vaporized in the vaporization cylinder 1 heated by the sheathed heater 34 to form a premixed gas. This premixed gas is distributed through the opening 4a at the bottom of the burner body 4 and the pressure equalizing plate 5.
The flame is ejected from the flame port 8 of the burner body 4 and forms a flame on the surface of the wire mesh 7. During strong combustion, the ejection speed of the premixed gas ejected from the flame ports 8 is high, and a main frame is formed at each flame port 8. At the same time, the wire mesh 7 is placed on the outer peripheral surface of the flame port 8.
Since the mesh is stretched, the premixed gas ejected from the flame port 8 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 seven 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 7. Therefore, although the lifting phenomenon does not occur during weak combustion, the temperature of the wire mesh 7 tends to increase.

Problems to be Solved by the Invention However, in the burner configuration as shown in the conventional example, the wire mesh 7 is repeatedly expanded and contracted over time, causing distortion in a part of the wire mesh, and the burner body 4. There is a sufficient risk of creating a gap between the outer circumferential surface 4b and the wire mesh 7. When a gap is created between the outer circumferential surface 4b of the burner body 4 and the wire mesh 7, a flame is formed in this gap, and a close flame is formed especially during weak combustion, so the wire mesh becomes hotter and hotter, increasing in red heat and The wire mesh 7 tends to swell. This causes a problem in the high temperature durability of the wire mesh 7, leading to local deformation and breakage, and finally there is a risk of backfire combustion in which the flame is drawn into the burner body 4 from that part.

The present invention solves the above conventional problems,
This reduces the temperature of the wire mesh, reduces deformation and damage to the wire mesh, and improves the safety and comfort of the combustor.

Means for Solving the Problems In order to achieve the above object, the present invention presses the wire mesh provided on the outer peripheral surface of the burner body from the outer periphery to recess the wire mesh at the burner port inward, and It has a configuration in which a plurality of spot welds are provided between the flame port and the flame port.

Effects According to the above-described configuration of the present invention, since the wire mesh is recessed inside the flame port, the flame does not come into close contact with the wire mesh, and the temperature of the wire mesh decreases. Moreover, the adhesion of the wire mesh to the burner body is increased by welding a plurality of spots, and deformation and breakage are reduced.
As a result, combustion without flashback or the like can be guaranteed for a long period of time, improving the safety of the combustor.

Example An example of the present invention will be described below. First, the overall outline will be explained with reference to FIG. 2. In Fig. 2, 11 is a cylindrical vaporizing cylinder;
A nozzle 12 and a throat 13 are provided as discharge ports for fuel and combustion air. A sheathed heater 14 is embedded in the outer periphery of the vaporization cylinder 11,
A burner body 15 is screwed to the upper part of the burner body 15.

The burner body 15 has an opening 16 at the bottom, and inside thereof is a pressure equalizing plate 2 having a plurality of small holes.
0. A resistance plate 21 is provided, and a double burner cap 22 is fixed to the upper opening with a nut 23. Reference numeral 17 denotes a plurality of vertically elongated flame ports provided on the peripheral wall of the burner body 15, and a flame rod 26 (see FIG. 2) is provided opposite a part of the flame ports.
An auxiliary burner port 17a consisting of a plurality of small holes is provided at the lower part of the burner port 17 facing thereto. 18 is a wire mesh installed inside and outside the peripheral wall of the burner body 15; 24;
is an ignition electrode provided opposite to one of the flame ports 17,
25 is a burner case surrounding the vaporizing cylinder 11.

Next, the burner section will be explained with reference to FIG. The wire mesh 18 attached to the outer peripheral surface of the burner body 15 is pressed from the outer peripheral direction with a material such as urethane rubber to increase its adhesion to the burner body 15, and to form an inward recess 28 in the wire mesh 18 of the burner port 17. I'm letting you do it. Furthermore, as is clear from FIG. 1, spot welds 19 are provided at three points within the longitudinal width of the flame ports, at the top, center, and bottom between the flame ports. These provide the following effects.

First, by pressing the wire mesh 18 from the outer circumferential direction, the adhesion between the wire mesh 18 and the burner body 15 is increased. Further, since the wire mesh 18 of the flame port 17 is recessed inward, the recess 28 tends to deform inward as the temperature of the wire mesh increases. Therefore, a gap between the burner body 15 and the wire mesh 18 is less likely to occur, and the number of subframes that tend to come into close contact with the wire mesh 18 is reduced, so that the temperature of the wire mesh 18 is maintained low. In particular, since the wire mesh 18 at the burner port 17 is recessed as described above, the main frame is not in close contact with the burner body 15 but is formed apart from it, reducing the thermal influence from the main frame and making it recessed. Since the wire mesh 18 is located on the inside, it is greatly affected by the premixed gas, increasing the cooling effect and further lowering its temperature.

On the other hand, the three-point spot welding 19 between the flame ports 17 further increases the adhesion, and the deformation of the wire mesh at the upper and lower portions of the flame ports 17 is almost completely controlled. Subframes, which tend to occur more frequently, almost no longer occur. As a result, the temperature of the wire mesh further decreases. According to experiments, in a combustor that is neither pressed nor spot welded, the expansion of the wire mesh is 0.5 to 1.0 mm, and the temperature of the wire mesh during low-calorie combustion is approximately 950°C (heat-resistant temperature) to 970°C. When this combustor is pressed, the amount of expansion of the wire mesh is
0.25 to 0.5 mm, the temperature of the wire mesh will be approximately 930°C to 950°C, and if three spot welding is further provided, the expansion amount of the wire mesh will be 0 mm and the temperature of the wire mesh will be approximately 890°C to 920°C.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, the temperature of the wire mesh can be lowered, and the wire mesh can be deformed.
It is possible to reduce breakage and improve the durability of the wire mesh, and at the same time, it is possible to provide a highly safe combustor with no backwater or the like.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a combustor according to an embodiment of the present invention, FIG. 2 is a sectional view of the entire combustor, and FIG. 3 is a sectional view of a main part of a conventional combustor. 15... Burnabody, 17... Enguchi, 18...
...wire mesh, 19...spot weld, 28...indentation.

Claims (1)

[Claims] 1. A wire mesh is closely attached to the outer circumferential surface of a burner body having a plurality of burner ports, and this wire mesh is pressed inward from the outer circumferential direction to recess the wire mesh at the burner port portion into the burner port, and the wire mesh at the burner port portion is recessed into the burner port, and each of the burner ports is A combustor with multiple spot welds added between the upper and lower widths of the flame port.