JPS6331684B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wick-type liquid fuel combustion device, and its purpose is to reduce the amount of fuel vaporized due to tar-like substances generated and accumulated in the fuel vaporization part of the wick; The purpose is to prevent the generation of irritating odors, carbon monoxide, etc. that accompany this, and to ensure stable combustion over a long period of time.

In a wick-type liquid fuel combustion device, liquid fuel is sucked up by the capillary action of the wick, vaporized from the tip of the wick, and then burned. However, the fuel vaporization section at the tip of the wick is constantly exposed to high temperatures during combustion, and there is not enough oxygen. Because of the atmosphere present in the fuel, part of the liquid fuel is easily oxidized and polymerized to produce tar-like substances.
The generation and accumulation of this tar-like substance in the fuel vaporization section has caused various problems as described below.

The generated tar-like substance blocks the surface and internal capillaries of the fuel vaporization section, suppresses the suction and vaporization of liquid fuel, and reduces the amount of combustion.

As the amount of combustion decreases, the balance between air and fuel in the combustion chamber collapses, leading to incomplete combustion, which generates toxic carbon monoxide, pungent odors, soot, etc.

Due to the accumulation of tar-like substances, the volume (thickness) of the fuel vaporization section increases, making it difficult to move up and down, creating a dangerous situation in which it is impossible to lower the wick to extinguish the fire.

Tar-like substances flow between the wick and the inner or outer wick supporting the wick, causing them to stick together and causing the dangerous situation described above.

Accumulation of tar-like substances at the tip of the fuel vaporizer impairs fuel suction, making it difficult to ignite when starting, and the flame does not travel all the way around the wick, resulting in large amounts of carbon monoxide, pungent odors, Susu et al.

The generation and accumulation of tar-like substances that cause these problems can occur if a portion of the fuel is altered (for example, if it is left at high temperatures or under direct sunlight for a long period of time, oxides, peroxides, etc. are formed), This occurs significantly and in a short period of time when different types of high boiling point components are mixed (for example, light oil, heavy oil, machine oil, salad oil, etc. mixed into kerosene).

The present invention provides a liquid fuel combustion device that eliminates these conventional drawbacks and can ensure stable combustion over a long period of time.One embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention.
Reference numeral 1 denotes a combustion tube, which is formed by arranging an inner flame tube 2, an outer flame tube 3, and an outer flame tube 4 approximately coaxially in order from the inside to the outside. Further, a combustion chamber 5 is formed between the inner flame tube 2 and the outer flame tube 3. On the other hand, between the inner wick tube 6 and the outer wick tube 7, the tip of the wick 9 fixed to the wick retainer 8 projects into the combustion chamber 5 as a liquid fuel vaporization section 9a. The lamp wick 9 is moved up and down together with the wick holding fitting 3 by a wick up and down means (not shown). Here, a plurality of air holes 12 and 13 are provided on the side walls of the inner flame tube 2 and the outer flame tube 3, and in particular, the one located at the lower part of the inner flame tube 2 facing the fuel vaporization part 9a of the wick is A plurality of air holes 12a, 12b, 1 whose opening diameters are successively smaller toward the top of the flame tube 2.
2c, and are arranged linearly in the vertical direction of the inner flame tube 2. Further, inside the inner flame cylinder 2, a partition plate 10 having a plurality of ventilation holes 11a and 11b is provided, and a top plate 15 having a plurality of ventilation holes 14 is provided at the upper part. In addition, 16 is a red-hot coil,
17 is a red-hot net, and 18 is a flare plate.

Next, the operation will be explained. Initially, as shown in FIG. 2, a stable flame is formed in the air hole 12 of the inner flame tube 2, and from there, the latent heat of vaporization of the fuel is supplied to the fuel vaporization section 9a to vaporize the fuel. Fuel is vaporized from part 9a. At this time, the fuel vaporization section 9a at the bottom of the inner flame cylinder 2
In the air holes 12a, 12b, 12c, etc. that face the fuel and air, the concentration of the mixture of fuel and air is high and the temperature is low, so no flame is formed, and in this state, stable combustion occurs and the rated combustion amount can be obtained.

Next, when the tar-like substance ta accumulates in the fuel vaporization section 9a after being used for a long period of time, this fuel vaporization section 9
The amount of fuel vaporized from a decreases, and the latent heat of vaporization also decreases, causing the atmospheric temperature to rise, causing a flame to rise as shown in Figure 3.
b and c are formed by moving to the lower part of the inner flame cylinder 2,
The fuel vaporization section 9a is further heated by these flames b, c, etc., and the accumulated tar-like substances are
Since ta, tb, etc. are thermally decomposed and removed, vaporization is promoted. When the tar-like substance tb further accumulates, a flame a is formed as shown in FIG. 4, which similarly prevents the combustion amount from decreasing.

As described above, according to the present invention, even if tar-like substances are accumulated in the fuel vaporization section at the tip of the wick, a sudden decrease in the amount of combustion can be suppressed. The specific effects will be explained below.

By gradually reducing the air hole diameter toward the top of the inner flame tube 2, the flame can be gradually moved downward as the combustion amount decreases, which suppresses the decrease in the vaporization amount and prevents sudden fluctuations in the combustion amount. To prevent. In other words, if the flame is suddenly transferred from the state shown in Fig. 2 to the state shown in Fig. 4 with a slight decrease in combustion rate (approximately 90% of the initial value), the amount of vaporization will rapidly increase, and the initial stable combustion rate (rated combustion amount), resulting in a dangerous situation. Also, the amount of combustion has decreased considerably (initial
Although it is possible to transfer the amount at once after the amount has been reduced (approximately 80%), it will be difficult to recover 100% of the combustion amount.

12 with a larger air hole diameter at the bottom of the inner flame tube 2
Due to a>12b>12c, a large flame a
etc. are formed, which has the effect of heating the fuel vaporizing section 9a and restoring the combustion amount. That is, for example, the air hole 12 is set to the diameter of the largest air hole 12a.
When the opening diameters of holes b and 12c are matched, flames are formed in the air holes 12b and 12c during initial stable combustion (near the fuel vaporization section 9a, the concentration of the mixture of fuel and air is higher in the lower part, and the atmosphere The temperature is low and the fuel is outside the flammable range, but as you move towards the top, the concentration of the air-fuel mixture becomes thinner and the ambient temperature rises, making it easier to create a state within the flammable range.)
Although it is possible to increase the initial stable combustion amount (rated combustion amount), the combustion amount does not recover because the flame transfer operation is not performed in response to the decrease in the combustion amount. In this way, in order to prevent flames from forming in the air holes 12a, 12b, 12c, etc. during initial stable combustion, and to form a large flame a in the lower air hole 12a of the fuel vaporizing section 19a to increase the effect, it is necessary to Considering the balance of the air mixture concentration and ambient temperature, it is necessary to make the opening diameter of the air hole 12a larger toward the lower part of the fuel vaporization section 9a.

If the air holes 12a, 12b, 12c are arranged in a straight line in the vertical direction, if the combustion amount decreases, the flame will be transferred from the air hole 12 to the lower air holes 12a, 12b, 12c, etc. of the inner flame cylinder 2 one after another. Effective for transition. In other words, when air holes are arranged in series, the ejected air flow from each air hole rises vertically and forms a single flow, and within this flow, the concentration of the fuel-air mixture decreases due to the reduction in combustion amount. The change occurs continuously, and the concentration reaches the flammable range at any one of the plurality of air holes, and a flame is formed, making it easy for the flame to move.

Note that the air hole 12 facing the fuel vaporization section 9a
The effects of the present invention can be obtained even if elements a, 12b, 12c, etc. are provided not only at the lower part of the inner flame tube 2 but also at the lower part of the outer flame tube 3 or both.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
Figures 3 and 4 are enlarged sectional views of main parts for explaining the operation. 1... Combustion tube, 2... Inner flame tube, 3... Outer flame tube,
4... Outer tube, 5... Combustion chamber, 9... Light wick, 9a...
...Fuel vaporization section, 12, 12a, 12b, 12c...
...Air hole.

Claims (1)

[Claims] 1. A combustion tube formed by arranging an outer tube, an inner flame tube, and an outer flame tube each having a plurality of air holes in order from the inside to the outside, and a fuel tube at the tip. a lamp wick provided with a vaporizing section protruding into a combustion chamber formed by an inner flame tube and an outer flame tube of the combustion tube, the inner flame tube and the outer flame tube facing oppositely to the fuel vaporization section; At least one of the portions is provided with air holes which are arranged linearly in the vertical direction and have a diameter decreasing in order toward the top, and in which a flame is generated when the amount of fuel evaporation decreases due to tar adhesion or the like in the fuel vaporization section. liquid fuel combustion equipment.