JPH0248805B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device used for home heating and the like.

Conventional structure and its problems Conventionally, in a wick-type liquid fuel combustion device used in kerosene stoves, etc., as shown in Fig. 1, there are many air holes B on the side wall of the inner flame cylinder A and on the top plate C. A plurality of vent holes D are provided, and an outer flame cylinder E is provided on the outside and two vent holes are provided at the upper end.
A second flame ring F is provided. This secondary flame ring F
Since a secondary flame H is formed between the flame expansion plate G provided above the inner flame cylinder A, the following problems arise.

(1) Since the secondary flame H is regulated by the end of the flame expansion plate G, it becomes a continuous flame state, and the mixing of fuel and air due to subdivision of the secondary flame H is not promoted, and the secondary flame H
It becomes a yellow flame and tends to generate soot.

(2) The air from the ventilation hole D of the top plate C expands and slows down, and flows out along the flame expansion plate G, so it covers the secondary flame H rather than rushing into it, and the fuel Mixing of air and air is not promoted, and 2
The secondary flame H becomes a yellow flame and tends to generate soot.

(3) The height of the flame expansion plate G and the outer secondary flame ring F is
Since they are almost the same, the standing flame (particularly the local standing flame) of the secondary flame H is caught above the inner flame expansion plate G, resulting in a lack of air, which tends to generate soot and carbon monoxide.

Purpose of the Invention The present invention is intended to solve such conventional problems, and by promoting fine division and mixing of the secondary flame by air flowing in from the upper part of the side wall of the inner flame cylinder, the secondary flame becomes a blue flame and shortens the flame. It performs flaming, prevents the generation of soot and carbon monoxide, and improves combustion characteristics.

Structure of the Invention The present invention comprises a part of an oblong air hole provided horizontally at the top of the inner flame tube and a constricted portion of a secondary flame ring provided at the upper end of the outer flame tube. It is something.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, 1 is a lamp wick whose upper end is exposed during combustion to a combustion chamber 4 consisting of an inner flame tube 2 and an outer flame tube 3, and a gap formed by a wick guide tube 5 and an outer core tube 6. It is designed to move up and down. The inner flame cylinder 2 is provided with various air holes 2a in its side wall. A plurality of oblong air holes 2b are provided in the upper side wall of the inner flame tube 2 in the horizontal direction of the inner flame tube 2, and the air holes 2b are arranged in a staggered manner in a plurality of rows and overlap in the vertical direction of the inner flame tube 2. I have set it up. Further, the air hole 2b is provided downward from the top of the inner flame tube 2, and the opening area of the air hole 2b alone is also larger than that of the other air holes of the inner flame tube 2.
It is set larger than a. 7 is a secondary flame.
8 is the top plate of the inner flame cylinder 2. The outer flame cylinder 3 has a large number of various air holes 3a on its side wall, and the upper part thereof has many air holes 3b with large opening diameters, forming a red-hot part 3c. A secondary flame ring 3d is provided at the upper end of the outer flame cylinder 3, and an outlet of the combustion chamber 4 is formed by a constricted portion 3e of the secondary flame ring 3d. Further, the throttle portion 3e is provided so as to face a part of the array of horizontally elongated air holes 2b that are provided overlappingly in the vertical direction of the inner flame cylinder 2. Reference numeral 9 denotes an outer cylinder, and a transmitting cylinder 10 made of a heat-resistant glass cylinder is provided on the upper part of the outer cylinder. A chimney top 11 is provided at the top of the transmission tube 10, and a main combustion exhaust gas passage 11a with a large opening is provided approximately in the center thereof, and a plurality of relatively small auxiliary combustion exhaust gas passages 11b are provided around the main combustion exhaust gas passage 11a. .
An upper incandescent body 12 is suspended downward from the peripheral wall of the main combustion exhaust gas passage 11a. The inner flame tube 2, outer flame tube 3, and outer tube 9 are concentrically assembled using cross pins 13.

In the above configuration, when the lamp wick 1 is ignited, combustion starts, and high-temperature combustion gas due to combustion rises in the combustion chamber 4 and flows into the main combustion exhaust gas passage 1 of the chimney top 11.
1a, a thermal draft is generated by passing through the auxiliary combustion exhaust gas passage 11b, and the air necessary for combustion flows into each air hole of the inner flame tube 2 and outer flame tube 3, and the lamp wick 1 has a heat draft generated through each air hole. Flame-holding combustion flame (primary flame)
heat is supplied to vaporize the liquid fuel and sustain combustion. At this time, a large amount of air flows in a layered manner from a plurality of rows of oblong air holes 2b in the upper side wall of the inner flame cylinder 2, and the secondary flame 7 is subdivided in the vertical direction from its root. Since the holes 2b are arranged in a staggered manner in the vertical direction of the inner flame tube 2, air sequentially flows into the rising combustion gas and diffuses, so that sufficient air is supplied and the fuel and Since the mixing of air is promoted, the combustion reaction becomes active, and the secondary flame 7 can be made blue and short, the combustion characteristics are also improved, and the generation of soot, carbon monoxide, etc. is prevented. In addition, since the oblong air hole 2b was provided at the top of the inner flame tube 2, the formation of the secondary flame 7 was regulated by the air flowing in from the air hole 2b, and the secondary flame 7 entered the combustion chamber 2. Since it is close to the center of the flame tube 2, it does not get caught on the top plate 8 of the inner flame tube 2.
Furthermore, since the upper incandescent body 12 is not touched, soot adhesion and deterioration of combustion characteristics are prevented. Further, since the oblong air hole 2b has a larger opening area than the other air holes 2a of the inner flame cylinder 2, the combustion chamber 4
A sufficient amount of air constantly flows into the vicinity of the outlet to completely burn off the remaining combustion gas rising, improving combustion characteristics.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) Since multiple oblong air holes are provided at the top of the inner flame tube, a large amount of air flows in from the horizontal peripheral wall of the inner flame tube in a layered manner, distributing fuel and air over a wide area. Since mixing is promoted, the combustion speed increases rapidly, making it possible to make the secondary flame greener and shorter.

(2) Since the secondary flame ring is provided with a constriction part, the combustion gas rising in the combustion chamber is directed toward the oblong air hole, promoting combustion and achieving a short flame.

(3) Since the throttle part is provided in a part of the oblong air hole facing each other, the upper part of the combustion chamber is covered by the inflow of air from the oblong air hole, which prevents the combustion gas from remaining unburned. Complete combustion is possible.

(4) Since the narrowing part is provided in a part of the oblong air hole to face it, a part of the air flowing out from the air hole flows backward or the flow speed is weakened.
The flame stability of the flame formed in the oblong air holes can be improved and stable combustion can be performed.

(5) The horizontally oblong air vents make the secondary flame blue, which reduces standing flames when the amount of combustion increases, or yellow flames that generate a large amount of soot even if local standing flames occur. It can be prevented.

(6) The oblong air holes make the secondary flame shorter, so when a blue flame-like secondary flame rises due to increased combustion, it does not spread much and there is a red-hot body at the top. Even in such cases, such contact can be prevented and the generation of carbon monoxide due to cooling can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a conventional example, and FIG. 2 is a half sectional view of a combustion apparatus showing an embodiment of the present invention. 2... Inner flame cylinder, 2a... Air hole on the side wall of the inner flame cylinder,
2b... Oblong air hole on the upper side wall of the inner flame cylinder, 3...
...Outer flame tube, 3d...Secondary flame ring, 7...Secondary flame, 8...Top plate of inner flame tube, 12...Upper red-hot body.

Claims (1)

[Claims] 1. An inner flame tube having a plurality of air holes, an outer flame tube having a plurality of air holes provided concentrically on the outside of the inner flame tube, and a plurality of flame tubes provided at the top of the inner flame tube. a secondary flame ring provided at the upper end of the outer flame tube, and a part of the oblong air hole provided on the secondary flame ring and provided in the inner flame tube. A combustion device comprising: a throttle section provided facing the .