JPH0245608Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention forms a double-tube type combustion tube by an inner flame tube, an outer flame tube, and a glass outer tube, and shows the red heat of the outer flame tube through the glass outer tube. It concerns oil stoves.

Conventional technology This type of conventional kerosene stove is, for example, disclosed in Japanese Patent Application Publication No. 1983
- As seen in Publication No. 45876, a primary air hole consisting of a circular hole with a diameter of about 3 mm to 4 mm or a square hole with a size equivalent to the hole area is made in the red-hot part of the outer flame tube, thereby making it possible to connect the inner flame tube and the outer flame. A part of the combustion gas rising between the tubes flows out to the surface of the outer flame tube through the primary air hole, forming a flame on the surface of the outer flame tube, thereby reducing the temperature of the outer flame tube surface to about 850℃. It was designed to have both an excellent heating effect and a visual effect through the glass outer cylinder. On the other hand, the primary air hole of the inner flame cylinder facing the red-hot part of the outer flame cylinder is a small hole with a diameter of about 1.6 mm, and its surface temperature is about 700℃ lower than that of the red-hot part of the outer flame cylinder. .

Problems that the invention aims to solve: The inner flame tube is dark, the radiation efficiency is low, and combustion noise is generated.

Means for solving the problem The primary air hole of the inner flame cylinder facing the red-hot part of the outer flame cylinder is shaped like a horizontally long slit, and the area of each slit is equal to the primary air hole of the red-hot part of the outer flame cylinder. It is the same or larger, and the step pitch at the bottom of the inner flame tube is narrower than the step pitch at the top.

Effect: Because the primary air hole has a horizontally elongated slit shape, the temperature of the inner flame tube rises more than before.

In other words, by narrowing the step pitch of the slit-shaped air holes at the bottom of the inner flame tube and increasing the air in this area, the combustion reaction is promoted, and by increasing the reaction heat, the inner flame tube is red hot from the center to the top. , and the radiation efficiency can be increased. Furthermore, by making the air hole of the inner flame cylinder into a horizontally long slit shape and increasing its area, the flame adhering to the air hole has a large reaction heat and reaches a high temperature, so that the stability of the flame is improved.

Furthermore, the flame becomes hot due to the heat of the flame comrades, resulting in a more stable flame, which can reduce the combustion noise that occurs when the flame is unstable.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the drawings. 1 is an oil tank, 2 is a core guide cylinder, 3 is a core outer cylinder, and 4 is both these cylinders 2. , 3, the lower end of which is immersed in oil in the oil tank 1, and these are well known. Reference numeral 5 denotes a double-tube type combustion tube, which includes an inner flame tube 6 placed on the upper end flange surface of the core guide tube 2, an outer flame tube 7 and an outer flame tube 7 placed on the upper end flange surface of the core outer tube 3. It is composed of a glass outer cylinder 8 which is provided on the outside facing the red-hot part of the glass outer cylinder 8, and a lower outer cylinder 9 which supports the glass outer cylinder 8.

In addition, the inner flame tube 6 and the outer flame tube 7 are provided with primary air holes 6a, 7a of about 1.3 mm in diameter at their lower portions, and the outer flame tube is provided with 7 is a primary air hole 7b which is a circular hole with a diameter of about 3 mm to 4 mm, similar to the conventional one.
The inner flame tube 6 is provided with primary air holes 6b which are horizontally elongated slits and each of which has an area equal to or larger than the primary air holes 7b. Further, the step pitch P1 between them at the lower part of the inner flame cylinder is made narrower than the step pitch P2 at the upper part.

Next, to explain its action, first, when the wick 4 is ignited, the air holes 6a at the bottom of the inner flame tube 6 and the outer flame tube 7,
A thermal reaction occurs during this time due to the air flowing in from 7a, and the kerosene vapor is decomposed into hydrocarbons with a small number of carbon atoms. Further, when reaching the primary air hole 7b of the red-hot part of the outer flame tube facing the glass outer tube 8 and the primary air hole 6b of the inner flame tube 6, the combustion gas A part of it flows out to the surface side of the outer flame tube 7 through the primary air hole 7b, forms a flame on the surface side, and causes the outer flame tube to open.
The temperature is raised to about 850°C, and the horizontally elongated slit-shaped primary air hole 6b of the inner flame tube 6 is equal to or larger than the primary air hole 7b of the outer flame tube 7, so that air can be removed from the inside of the inner flame tube 6. A large amount of air flows in and performs rapid combustion, raising the temperature of the inner flame cylinder 6. At this time, by narrowing the step pitch of the lower slit, the flame becomes even hotter due to the heat of the flame comrades, and the temperature of the inner flame tube 6 can be further increased, and the outer flame tube 7 and the inner flame tube 6 Radiant heat is emitted from both. As a result, radiant heat is dissipated from the entire combustion tube, and the red heat of the outer flame tube 7 is visible through the glass outer tube 8, and the red heat of the inner flame tube 6 is visible through the primary air hole 7b of the outer flame tube 7. The effect increases. According to experiments, the slit-shaped primary air hole 6b has a vertical width of W0.8 mm and a horizontal width of H20.
mm, the temperature of the inner flame cylinder 6, which previously only rose to about 700°C, could be raised to about 770°C, and at the same time, combustion noise was reduced.

Also, according to this experiment, by setting the vertical width W of the slit to within 1 mm, the air flowing in from the slit was given speed, and a flame was formed at a location slightly away from the edge of the slit. This made it possible to uniformly heat the inner flame tube 6 to red heat.

Effects of the Device As explained above, the present invention has the primary air hole of the inner flame tube facing the red-hot part of the outer flame tube in the shape of a horizontally long slit, and the step pitch at the bottom of the inner flame tube is made larger than the step pitch at the top. Because it is narrower, it is possible to raise the temperature of the inner flame tube and improve the red heat, and compared to the conventional one, it not only improves the visual effect through the glass outer tube, but also increases the radiation efficiency, and at the same time reduces combustion noise. It has the advantage of reducing the occurrence of

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a kerosene stove according to the present invention, and FIG. 2 is a perspective view of the main parts thereof. In the figure, 5 is a combustion tube, 6 is an inner flame tube, 6b is a slit-shaped primary air hole, 7 is an outer flame tube, 8 is a glass outer tube, P1 is a step pitch at the bottom of the inner flame tube, and P2 is a step at the top of the same. It's pitchy.

Claims (1)

[Scope of utility model registration request] In a double-tube kerosene stove in which a double-tube combustion tube 5 is formed by an inner flame tube 6, an outer flame tube 7, and a glass outer tube 8, and the red heat of the outer flame tube 7 is visible through the glass outer tube 8, The primary air hole 6b of the inner flame tube 6 facing the red-hot part of the outer flame tube 7 is shaped like a horizontally long slit, and the area of each slit is equal to the area of the outer flame tube 7.
This kerosene stove is characterized in that it is equal to or larger than the primary air hole 7b of the red-hot part of the kerosene stove, and that the step pitch P1 between them at the lower part of the inner flame tube is narrower than the same step pitch P2 at the upper part.