JPS6246970Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a combustion device having laminated combustion plates.

Conventionally, this type of combustion apparatus has been constructed as shown in FIG. That is, in the figure, 1 is a mixture pipe, 2 is a large number of thick combustion plates, and 3 is a laminated combustion plate formed by laminating the combustion plates 2, and the mixture pipe 1 is connected to one side. Therefore, the mixture of fuel and combustion air supplied from the mixture pipe 1 passes between each combustion plate 2 and forms a flame at the periphery thereof. Next, the laminated combustion plate 3 will be explained in detail. First, the combustion plate 2 is formed by stamping a thick metal plate using a press, as shown in FIG. It is made slightly longer than the length of the circular arc of the notched portion 5. Further, a plurality of protrusions 6 are provided on the outer circumferential surface of the short diameter portion 5, leaving uncut portions. Furthermore, the combustion plate 2 has a through hole 7 in the center, and the through hole 7 is punched to have approximately the same external shape as the protrusion 6 before being punched out. In particular, the long diameter part 8 of the through hole is provided so as to be larger than the outer circumference of the outer circumference short diameter part 5 of the combustion plate 2. Therefore, when two combustion plates are stacked one on top of the other with a 90° shift as shown in FIG. 3, a gap is formed between the outer peripheral surface of the short diameter portion 5 and the inner peripheral surface of the long diameter portion 8 of the through hole. Since each protrusion 6 is located in this gap, the gap at one location is 2.
The gap 10 is divided into three by the two protrusions 6, and a total of twelve gaps 10 are formed in this illustrated example. In addition to the gap 10, there is also a stacked gap 11 which communicates with the gap 10 through the long diameter 8 of each combustion plate 2 and the protrusion 6.
(shown in black in FIG. 1 for ease of understanding) is formed. Therefore, a series of gas passages are formed between the through holes 7 and the outer circumferential surface of the laminated combustion plate 3 through the gaps 10 and 11, and the gas passes from the mixture pipe 1 through the laminated gap 11. When the ejected gas is ignited, a flame is formed in the lamination gap 11.

In the structure of the laminated combustion plate 3 configured as described above, the flame formation gap is determined by the thickness of each combustion plate 2, and the length of the flame formation gap 10 relative to the circumferential length of each combustion plate 2 is also limited. As a result, the total area of flame formation gaps (hereinafter referred to as porosity) relative to the total area of the outer periphery of the laminated combustion plate 3 becomes extremely small in practical terms, resulting in the following drawbacks.

[1] The area efficiency is poor and the burner becomes large.

[2] The amount of heat received from the flame is large, and since the plate is thick, the amount of heat conduction is also large, so the inside of the combustion plate tends to reach a high temperature and is vulnerable to backfire.

[3] Because the plate is thick, the gaps between each layer are large, and the flames in each layer are likely to be separated. Therefore, flame stability due to mutual interference (especially blow-off, oscillating combustion, etc.)
decreases.

This invention was made to eliminate the above-mentioned drawbacks, and one embodiment of this invention will be described below with reference to the drawings.

In FIG. 4, 12 is the combustor main body, 12a is a throttle hole opened to inject fuel and combustion air into the combustor main body 12, and 12b is a throttle hole 12.
a vaporization wall for vaporizing the fuel introduced from a;
12c is a mixing chamber for premixing the vaporized fuel vaporized by the vaporization wall 12b and the combustion air introduced from the throttle hole 12a; 12d is a heat receiving wall for recovering combustion heat to the combustor main body 12; The air pipe is connected to the throttle hole 12a and has a nozzle 14 for supplying fuel on its central axis, and is connected to a blower (not shown). 15 is a heater that preheats the combustor main body 12 to a predetermined temperature; 16 is a laminated combustion plate in which formed combustion plates 20 and flat combustion plates 21 are alternately laminated; a closing plate 27 and an aperture plate 18 are integrated at both ends thereof; The combustion plate assembly is constructed by assembling the
Further, in this combustion plate assembly, the aperture plate 18 is connected to the mixing chamber 1.
On the 2c side, a closing plate 17 is located on the combustion chamber 22 side and attached to the combustor main body 12 via a throttle plate 18. Reference numeral 19 denotes a spark plug for igniting the air-fuel mixture ejected from the outer periphery of the laminated combustion plate 16.

Next, the combustion plate assembly will be described in more detail. First, the shaped combustion plate 20 is made of a thin plate, and as shown in FIG. 5, has a through hole 20a in the center.
The extruded parts A, 20b are partially extruded at equal pitches on the peripheral edge, and the extruded parts B, 20c are extruded at equal pitches between the extruded parts A, 20b, and the extruded parts A, 20b is extrusion part B, 20c
It is formed to be slightly wider than the above, and is provided with a through hole 20d.

On the other hand, the flat combustion plate 21 is made of a thin plate, and the sixth
As shown in the figure, the extruded parts A, B,
The shape is the same as that before molding 20b and 20c, and a through hole 21a is provided in the center portion, and through holes 21b are provided at equal pitches in the peripheral portion. Therefore, if a plurality of shaped combustion plates 20 and flat combustion plates 21 are stacked alternately as shown in FIG. 4, the laminated combustion plate 16 is constructed. Also, due to this lamination, there is a through hole 2 in the center.
A series of mixing passages are formed by 0a and 21a,
Further, due to the spacer effect of the extruded portions A, B, 20b, and 20c, a gap is formed between the shaped combustion plate 20 and the flat combustion plate 21, which communicate with the mixture passage, and as shown in FIG. Each extrusion part A, 20b
In this way, independent flame ports 23 are formed at equal pitches, and between the extrusion parts A, 20b and the extrusion parts 20c. Further, the closing plate 17 is made of a relatively thick plate, and as shown in FIG. 7, through-holes 17a are provided at the peripheral edge at the same pitch as the through-holes 20d. On the other hand, the aperture plate 18 is made of a relatively thick plate, and as shown in FIG.
8a, and through holes 18b having the same pitch as the through holes 20d are provided at the peripheral edge. Therefore, the closing plate 17 is located on one side of the laminated combustion plate 16, and the aperture plate 18 is located on the other side, and the through holes 17a, 18b, 20 of the closing plate 17, the aperture plate 18, and each combustion plate 20, 21 are arranged.
Insert the threaded rod 24 shown in FIG. 4 into d and 21b,
Tightening the nuts 25 completes the combustion plate assembly.

Next, the operation will be explained. Combustion air sent through the air pipe 13 is introduced into the mixing chamber 12c through the throttle hole 12a of the combustor main body 12, and at the same time, fuel is supplied through the nozzle 14. Nozzle 1
The fuel discharged from 4, for example, kerosene, is atomized by the shearing action of the relatively fast-flowing combustion air flowing around it, and collides with the vaporization wall 12b, which has been preheated to a predetermined temperature by the heater 15, and almost Evaporates instantly. After the vaporized fuel is sufficiently premixed with combustion air in the mixing chamber 12c, it passes through the through hole 18a of the throttle plate 18 and the mixture passage, and then passes through the gap between each combustion plate 20, 21 and exits from the flame port 23. It is ejected radially. The ejected air-fuel mixture is ignited by the spark plug 19, causing a combustion reaction. That is, a flame is formed at the outer edge of the laminated combustion plate 16. By recovering a part of the combustion heat generated by this combustion to the combustor main body 12 through the heat receiving wall 12d, the amount of heat required for vaporizing the fuel and preheating the combustion air is secured, and thereafter from the preheating heater 15. Heat supply becomes unnecessary.

In this way, in the combustion device according to this invention, the thickness of each combustion plate 20, 21 is thin relative to the extrusion height of the extrusion parts A, B, 20b, 20c, so the total area of the flame port 23 from which the premixture is ejected is , the ratio (open area ratio) to the total outer peripheral area of the laminated combustion plate 16 can be made quite large. Therefore, it is lightweight and the overall size of the burner can be reduced. In addition, because the porosity is large, the amount of heat received from the flame per unit area is small, and because the plate thickness is thin, there is little heat conduction from the outer circumferential surface to the inner circumferential surface.
Both sides of 0 and 21 are efficiently cooled. That is, the burner is extremely resistant to backfire, and since the flame port 23 is composed of extremely thin combustion plates 20 and 21, the flame is less likely to break up. Therefore, the flames are formed in groups and have the same effect as a combustion plate having large flame holes in the longitudinal direction, so that flame stability (particularly against blow-off, vibration combustion, etc.) is significantly improved.

As described above, according to this invention, since the laminated combustion plate is composed of a shaped combustion plate made of thin plates and a flat combustion plate made of thin plates, it is lightweight and compact, and prevents backfire, flame blow-off, and vibration combustion. It is possible to provide a combustion device that has great practical effects and has excellent effects on.

[Brief explanation of the drawing]

Figures 1 to 3 show a conventional gas burner using laminated combustion plates. Figure 1 is a side view of the gas burner with laminated combustion plates, Figure 2 is a plan view of the combustion plates, and Figure 3 is a A plan view showing a state in which two combustion plates are stacked, FIGS. 4 to 9 show an embodiment of the kerosene vaporizing burner according to this invention, and FIG. 4 is a longitudinal cross-sectional view of the kerosene vaporizing burner. Figures 5 and 6 are perspective views of a shaped combustion plate and a flat combustion plate, which are the essential parts of this invention, Figures 7 and 8 are perspective views of a closing plate and aperture plate, and Figure 9. is a partially enlarged view of a laminated combustion plate. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. In the figure, 20, 20a are shaped combustion plates and through holes, 2
0b, 20c are extrusion parts A and B, 21, 21a
2 is a flat combustion plate and a through hole, and 23 is a flame port.

Claims (1)

[Scope of utility model registration request] A formed combustion plate made of a thin plate having through holes in the center and partially formed extruded parts at approximately equal pitches on the periphery and a flat combustion plate made of a thin plate having through holes in the center are alternately used. They are stacked to form a mixture passage for fuel and combustion air in the center, and a number of independent flame ports communicating with the mixture passage between the extruded portions of each molded combustion plate, and the extrusion The inside of the combustion device is equipped with a laminated combustion plate configured to be isolated from the air-fuel mixture passage.