JPS58184408A - Kerosene burner - Google Patents

Abstract

PURPOSE:To prevent a flame from extending outside a device, by a method wherein a panel for preventing the production of an upright flame is located above a flame spreading panel and separately from the latter panel in a manner that the former panel covers an upper part of a gas between an outer shell of a combustion cylinder and an inner or an outer flame cylinder. CONSTITUTION:A plurality of leg parts 14 are located above a flame spreading panel 13, and a panel 15 for preventing the production of an upright flame, positioned above gaps between inner and outer flame cylinder 10, 11 and the outer flame tube 11 and an outer shell 12, is separately installed. This constitution causes a flame, naturally growing into a large upright flame, to move outwardly by dint of the panel 15, whereby an upright flame 16 decreases in height and is well mixed with secondary air, which results in reducing a quantity of an upright flame itself and in maintaining the safety. The narrower a gap A between the panel 15 and the outer shell 12 is, the more favorable it is for the prevention of the occurrence of an upright flame, but reversely, the larger a pressure loss is, which results in causing a turbulence of combustion, e.g., the reduction in a quantity of combustion heat, an increase in carbon monoxide in combustion waste gas, the production of a combustion noise due to a lift phenomenon of a flame, whereby the gap is decided from two factors of the prevention of the occurrence of an upright flame and the combustion properties.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil combustor, and particularly to preventing flames from extending outside the appliance.

Generally, in oil burners that use a wick and sustain combustion by natural draft, (a) If the wick is left fully exposed, (b)
If the flame is exposed to wind that causes turbulence in combustion (such as when the height of the C1 wick is adjusted from the normal use position or from a relatively low position to the highest position all at once), the flame may extend beyond the combustion tube and damage the large panel of the appliance. There was a risk that it would come out and cause a fire.

A conventional example is shown in FIG. 5 and FIG. 6, which shows a so-called vortaple oil valve, and this configuration will be explained first.

A combustion tube 2 called a chimney is provided inside the main body case 1, and a cylindrical i-shaped protrusion 4 is provided on the lower surface of the top plate 3 corresponding to the combustion section 2.

In other words, when a standing flame is generated from the combustion section 2, the flame 5
The flame 5 enters the flame shield 4, and this flame 5 reaches 3'.

It is designed to prevent leakage from the exhaust port 6 of the top plate 3. However, in this configuration, (1) the flame shield 4 is a separate component, resulting in high cost.

(2) Heat is concentrated on the medium heat section of the top plate 3 due to the flame shield 4Vc, causing warpage and thermal deformation in some areas.

(3) Also, since the central part of the top plate 3 changes color, treated steel plates such as 1 aluminum plated steel plate cannot be used.

(4) Depending on the size and height of the flame shield 4, even if a catalyst is intended to be installed above the combustion section 2, it cannot be installed because the surplus space becomes small. - It had the following drawbacks.

The present invention solves the above problems by improving the combustion tube itself and eliminating the flame shield. An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Figure 1, 7.8 is a cylindrical core guide tube.

Fuel tank provided in the lower space of the main body case (not shown)
A cylindrical lamp wick 9 is vertically movable and is fitted into the lamp wick 9, which projects upwardly. Next is the configuration of the combustion tube placed on the upper part of the core guide tube 7.8, where 10 is a cylindrical inner flame tube with many small holes, and 11 is a cylinder that covers the outer periphery of the inner flame tube 10. It is a shaped external flame cylinder, and is made up of an upper incandescent body made of a perforated plate such as a punched plate, a wire mesh, a lath net, etc., and a lower outer flame body having a large number of small holes. Reference numeral 12 denotes a cylindrical outer cylinder made of a heat-transmissive material such as heat-resistant glass, which covers the outer peripheral side surface of the outer flame cylinder 11 and has a metal portion 12' at the lower part.

The inner flame tube 10, outer flame tube 11, and outer flame tube 12 are arranged approximately concentrically with appropriate spacing from each other, and the gap between the inner flame tube 10 and the outer flame tube 11 is The structure is such that fuel gas is supplied from the tip of the lamp wick 9 located at the lower end, and combustion air is supplied from the lower end of the gap between the outer flame tube 11 and the outer tube metal part 12' and from inside the wick guide tube 7. Reference numeral 13 denotes a flame expansion plate provided on the upper part of the inner flame tube 1o, which is formed to forcefully supply secondary air from the hole 17a in the upper lid 17 of the inner flame tube 1o to the combustion gas. It has a plurality of legs 14 above the flame expansion plate 13, an inner flame tube 1o, an outer flame tube 11,
A flame prevention plate 15 located above the gap between the outer cylinders 12 is separately provided. Note that the leg portion 14 may be a cylinder with a total circumference of 6 or -7. The problem with this configuration is that what would normally be a large standing flame is rotated outward by the flame preventing plate 15, which lowers the height of the standing flame 16, and
Since the mixture with the next air is improved, the amount of flame itself is small, making it extremely safe. Furthermore, since the flame preventing plate 15 is provided separately, the hour wheel can be applied to conventional instruments as well.

By the way, regarding the spacing between the flame prevention plate 15 and the upper part of the outer cylinder 12, if it is narrow, 11 is advantageous in terms of flame prevention, but on the other hand, the pressure drop will increase. Disturbances occur in the original combustion characteristics (for example, a decrease in the amount of combustion, an increase in carbon monoxide in the combustion exhaust gas, and the generation of combustion noise due to the flame lift phenomenon).

Therefore, it is necessary to decide from the viewpoint of both flame prevention and combustion characteristics.

Figures 2 to 4 show the relationship between the front spacer and each combustion characteristic.
The ratio S/E is taken between the maximum combustion amount R (kca#/h)6 and the maximum combustion amount when there is no flame prevention plate 15, or in other words, when there is no pressure drop.

First, the maximum combustion amount shown in Figure 2 is the tested rating of 22.
00 to 0a1. /h of petroleum nutope, the combustion amount at maximum combustion is almost unchanged when the S/E value is 1.54, decreases by about 100kCa1//11 when the S/E value is 1.2, and 1.
At 0, the amount of combustion becomes less than the rated combustion amount. This is true.'c11 Needless to say, this is due to pressure loss -J, and if S/E is 1.2 or more, it shows that there is no large pressure loss.

Next, the CO/CO2 during combustion shown in Figure 3 is S/E
There is almost no change until the value reaches 1.0, and as the maximum combustion amount becomes lower than the rated value, the CO/CO2 value increases.

Furthermore, as shown in Fig. 4, regarding the generation of combustion noise, as a result of the experiment, there are cases where the S/E value is 1.0 and discontinuous combustion noise is emitted.
Of the o units that I tried, there were 3, and none had an S/E of 1.2 or higher.

These combustion characteristics show almost the same tendency even when confirmed using appliances with different ratings, so the above S/E value is 1.
The number is limited to 2 or more. In addition, 15a shown in FIG. 1 is a small opening such as a small hole provided in the top plate portion facing the gap between the inner flame tube 10 and the outer flame tube 11 of the second stop plate 15. The purpose is to minimize the pressure loss in the small opening 15a, and the size is such that the silent burning flame does not protrude straight beyond this small opening 15a, and the diameter is 4 mm and approximately 12.61 m or less. If it is larger than that, the standing flame will have a small opening 15
It shows a tendency to elongate from a. The purpose of this small opening 15& is also to make this flame prevention plate 16 red hot. For example, if combustion deterioration occurs due to malicious or inappropriate use. It is this flame prevention plate 16 on one side that causes red heat to deteriorate.
This can be used as a guideline for drying and cleaning the lamp wick 9 when the red heat in this area becomes inferior.

As described above, according to the present invention, the shape of the flame prevention plate of the combustion tube suppresses the flame to a small size and eliminates the need for a conventional flame shield, thereby solving one of the problems encountered in the prior art.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of essential parts showing one embodiment of the present invention, and Figs.
FIG. 4 is a FL combustion characteristic diagram, and FIG. 6 and non-FIG. 6 are a top view and a front view, respectively, showing an example of engagement. 1o... Inner flame tube, 11... Outer flame tube, 1
2...Outer cylinder, 13...Flame expansion plate, 15...
...Flame prevention board. Name of agent: Patent attorney Toshio Nakao and 1 other person1,
. Figure 1 Figure 2

Claims (3)

[Claims] (1) Equipped with a lamp wick that sucks up fuel from the tank and a combustion tube that burns the fuel vaporized from the lamp wick, the combustion tube is composed of an outer tube and a perforated plate such as a punched plate, wire mesh, or Ranu rope. It has a double-tube structure with an outer flame tube, and a flame expansion plate is provided on the upper part of the inner flame tube, and a flame prevention plate separate from the flame expansion plate is installed above the flame expansion plate. , an oil combustor provided to cover the upper part of the gap between the outer flame cylinders. (2) The petroleum oil according to claim 1, wherein a small opening such as a small hole or a small notch is provided in the part of the flame prevention plate facing the gap between the inner flame tube and the outer flame tube. combustor. (3) Ratio S/ of the narrowest opening area S (+m2) formed by the flame prevention plate and the outer cylinder and the maximum combustion amount E (Rca//h) when there is no flame prevention plate. The oil combustor according to claim 1, wherein the oil burner is E21.2 or higher. 21,-