JPS60186604A - Combustion device - Google Patents

Abstract

PURPOSE:To improve a mixing action taking place inside a secondary combustion chamber and provide a blue and short flame, while simultaneously burning a fuel perfectly, by opening a single-purpose secondary air port through the upper portion of inner flame cylinder to form a secondary combustion section and providing the upper portion of opposing outer flame cylinder with a throttle plate at a level lower than the secondary air port. CONSTITUTION:As the vaporization of liquid fuel proceeds, more fuel is burnt to cause a primary combustion chamber 9 subjected to an overload, urging unburnt gas to raise upwardly to a secondary combustion chamber 17. A hot, concentrated and oxygen-starving unburnt gas is collected around the entire upper periphery of inner flame cylinder located below a secondary air port by means of throttle plate 10 once, and then uniformly transferred to an area adjacent to a plurality of secondary air ports. An abundant volume of air which has been finely divided is supplied to the dense unburnt gas through many secondary air ports 3, so that the gas and the air are mixed in a finely divided and dispersed condition at an accelerated speed and in an effective manner. Thus, the unburnt gas can be burnt perfectly inside the secondary combustion chamber 17 without the chance of being thermally cracked, developing instead a ring- shaped blue and short secondary combustion flame 21 which may hardly generate soot and other noxious gases such as carbon monoxide.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a small space heater that burns fuel to produce a heating fan, and a combustion device used in a stove or the like.

Conventional structure and its problems Conventionally, in particular, in a dual-tube type combustion device that uses a wick to vaporize and burn liquid fuel, as shown in Fig. 2,
Inner flame cylinder C and outer flame IN+ having multiple air holes a and b
The upper part of the primary combustion chamber e consisting of d is a top plate and a flame expansion plate f
It has a slit-shaped opening 1'' g between the outer cylinder top plate and the secondary combustion chamber i, and there is no throttle plate for the opening g. 2 formed in chamber i
Flame j has a slow mixing action of rising unburnt gas,
Not only does it cause a yellow flame with a long flame length and uneven combustion, but it also causes incomplete combustion, producing soot, carbon oxides, and odors, and has problems such as the inability to downsize the combustion chamber. Ta.

Purpose of the Invention The present invention eliminates the above-mentioned conventional problems by promoting the mixing action inside the secondary combustion chamber to achieve complete combustion while making the flame brighter and shorter. The purpose of the present invention is to provide a clean, compact combustion device that generates extremely little harmful gas.

Structure of the Invention In order to achieve this object, the present invention provides a secondary combustion section by forming a dedicated secondary air hole in the upper part of the inner flame cylinder.
By arranging the throttle plate provided on the upper part of the outer flame tube facing the primary air hole below the opening of the secondary air hole, the unburned gas rising from the lower part of the primary combustion chamber can be transferred to the secondary combustion chamber by the throttle plate. By supplying a large amount of air that is brought to the air hole side and subdivided from the secondary air hole, the mixing action is promoted, making it possible to achieve complete combustion with a blue flame and a short flame. .

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 denotes an inner flame cylinder, which has a plurality of primary air holes 2 in the lower part and secondary air holes 3 in the upper part, and has a lower partition plate 4 in the lower part and a partition plate in the upper part. 5 at the bottom and a top plate 6 at the upper end. The secondary air hole 3 is located between the first partition plate 4 and the top plate 5, and a plurality of air holes d and 3' are bored in the upper and lower partition plates 4゜3. Reference numeral 07 denotes an outer flame tube arranged concentrically around the outer periphery of the inner flame tube 1, with a plurality of primary air holes 8 sparsely arranged in the lower part and primary air holes with a larger diameter than the air holes 8 in the upper part. Holes 8 are closely drilled. A primary combustion chamber 9 is formed between the inner flame tube 1 and the outer flame tube 7, and a diaphragm plate 10 is provided at the upper end of the outer flame tube 7.
The secondary air hole 3 is opposed to the secondary air hole 3, and is placed at the same level or lower than the secondary air hole 3. Reference numeral 11 denotes an outer cylinder having a seat 12 on the upper part. On the seat 12, an upper top plate 15 is placed which is equipped with a glass cylinder 13 made of a heat-resistant transparent material and an incandescent body 14 made of a plurality of rings, etc., and a cross pin 16 is placed thereon.
．． At 16', the inner flame tube 1, outer flame tube 7, and outer tube 11 are concentrically connected to form a double-tube type combustion tube. On the other hand, 2
A space between the secondary air 3, the aperture plate 10, and the glass cylinder 13 constitutes a secondary combustion chamber 17. 18 is a lamp wick; 19 is a fire pan on which the vertical movement guide of the lamp wick 18 and the inner and outer flame cylinders 1 and 7 are placed. 2o is a primary combustion flame generated in the primary combustion chamber 9, and 21 is a secondary combustion flame generated in the secondary combustion chamber 17.

The effect will be explained above. When the liquid fuel is sucked up by the lamp wick 18 and ignited onto the lamp wick 18 from the outside of the inner and outer flame tubes 1 and 7 by some method, the inner and outer flame tubes 1,701
Air is supplied to the vicinity of the lamp wick 18 through the secondary air holes 2 and 8, combustion starts around the entire circumference of the lamp wick 18, and the combustion is promoted by the combustion heat, and the vaporization of the liquid fuel from the lamp wick 18 is promoted. Combustion lJ1 increases, combustion spreads throughout the primary combustion chamber 9, and a large number of primary combustion flames 20 are formed. Over time, combustion becomes active and promoted, and finally the primary combustion chamber e becomes overloaded. The unburned gas rises to the secondary combustion chamber 17. However, a large amount of unburned gas rising from the primary combustion chamber 9 to the secondary combustion chamber 17 receives high-temperature heat from the many primary combustion flames 2o and is susceptible to thermal decomposition due to lack of air.
This phenomenon means that yellow fire, soot, and a large amount of carbon monoxide are likely to be generated. However, the highly concentrated unburned gas, which tends to be lacking in air at high temperatures, is concentrated on the entire upper circumference of the inner flame tube 1 below the secondary air hole 3 by the throttle plate 10 at one end, and is concentrated on the opposite side of the throttle plate 100 and at the position In other words, by uniformly transporting the dense unburned gas to the vicinity of the plurality of secondary air holes 3, which are provided at the same level or more than the diaphragm plate, and which are drilled all around the upper part of the inner flame cylinder 1, the dense unburned gas is On the other hand, since a large amount of finely divided air is supplied from the large number of secondary air holes 3, the unburned gas and the secondary air flow are finely divided and diffused and mixed at high speed and effectively. Therefore, the unburned gas generates a ring-shaped secondary combustion flame 21 in the secondary combustion chamber 17 without being thermally decomposed, and which is a short blue flame and does not easily generate harmful gases such as soot and carbon monoxide. complete combustion. The incandescent body 14 is heated to a high temperature by receiving the heat of the secondary combustion flame 20 of this complete combustion flame, and emits high-temperature radiation, thereby effectively contributing to heating and the like.

Next, to extinguish the fire, if the wick 18 is lowered from the surface of the fire pan 19, the fuel will flow out from within the primary combustion chamber 9 to extinguish the fire. The following effects can be obtained. In other words, the high temperature and high concentration unburned gas rising from the primary combustion chamber is once collected uniformly below the secondary air hole by the throttle plate, and then is finely divided from the secondary air hole into a large amount of unburned gas. Because air is effectively supplied, the mixing action is effectively promoted without decomposition.As a result, blue flame-shaped short flame soot and odor are generated near the secondary air hole of the secondary combustion chamber. −
It produces a clean, ring-shaped secondary combustion flame that produces very little harmful gas such as carbon oxide, resulting in complete combustion. Since complete combustion occurs in this way, it is safe as a combustion device. In addition, since the flame can be shortened, the size can be reduced and the cost can be reduced. Furthermore, it is visually clean because it burns gastritis.

On the other hand, since the space between the primary combustion chamber and the secondary combustion chamber is narrowed by a throttle plate, the unburned gas is mixed with air efficiently and uniformly, which reduces the possibility of dimensional variations in component parts and fuel and air supply. This mixing effect is promoted and maintained in a reliable manner even in the face of slight external fluctuations in the fuel, aging, etc., so a complete combustion state can always be maintained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of the main part of a conventional example, partially cut away. 1...Inner flame tube, 2...Primary air hole, 3
...Secondary air hole, 7...Outer flame tube, 10
...Aperture plate, 11...Outer cylinder. Name of agent: Patent attorney Toshi Nakao TL or 1 person 1
figure

Claims (1)

[Claims] A combustion tube is constructed by concentrically coupling an inner flame tube, an outer flame tube, and an outer tube in which a plurality of primary air holes are bored, and a secondary air hole is bored in the upper part of the inner flame tube. A combustion device comprising: a diaphragm plate provided on the upper part of the outer flame tube facing the secondary air hole, and arranged below the opening of the secondary air hole.