JPH0248806B2 - NENSHOSOCHI - 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 configuration and its problems Conventionally, this type of combustion equipment has a structure as shown in Figure 1.
A large number of air holes A ₁ were provided in the side wall of the inner flame tube A, and a large number of through holes B ₁ were provided in the glowing part B.
Further, a secondary flame ring C was fixed to the upper end of the red-hot part B, and the upper end of the transmission tube D was supported at the end thereof.
This secondary flame ring C and a flame expansion plate E provided above the inner flame cylinder A constituted an exhaust gas passage F. During steady combustion, a secondary flame G is formed, and primary flames A 2 and B 2 are held in the through hole B ₁ of the red-hot part B and _the air hole _{A 1 of} the inner flame cylinder A, promoting combustion. Ta.

However, conventional combustion devices have the following problems.

(1) Since the primary flame _A2 is formed up to the upper part of the inner flame tube A, all the air flowing in from the air hole _A1 is
The air-fuel mixture that is used as the secondary flame A ₂ and rises from the center of the combustion chamber H becomes air-deficient, and is heated by the primary flames A ₂ and B ₂ and reaches a high temperature, causing thermal decomposition, and the secondary flame G becomes a yellow flame. and generates soot.

(2) Since the primary flame _A2 is formed up to the upper part of the inner flame tube A, the high temperature exhaust gas expands and rises _rapidly from the combustion chamber H to the secondary flame G. Even if air flows in from the through hole _B3 at the top of B, it flows along with this high-temperature exhaust gas and does not reach the inside, so the inside of the secondary flame is in a high-temperature air-deficient state and becomes yellow, where soot is easily generated. It becomes a flame.

(3) If the secondary flame is yellow flame, if the amount of combustion becomes excessive or if the secondary flame comes into contact with other structures and the temperature drops, a large amount of soot will be generated and the room will become dirty.

Purpose of the Invention The present invention solves such conventional problems by properly mixing air and air-fuel mixture (unburnt exhaust gas), creating a premixed state, and aiming to turn the secondary flame into a blue flame. , which prevents soot generation.

Structure of the Invention The present invention provides an inner flame tube having a plurality of air holes, an outer flame tube having a plurality of air holes concentrically provided on the outside of the inner flame tube, and an outer flame tube having a plurality of air holes arranged concentrically on the outside of the inner flame tube. A plurality of air holes are provided, the air hole having the largest opening area among the air holes of the inner flame tube, a red hot part provided at the upper part of the outer flame tube, and two air holes provided at the upper end of the red hot part.
A secondary flame ring, a plurality of air holes provided in the inner flame tube below the secondary flame ring and with small lateral intervals, and an air hole with the largest opening area of the inner flame tube in the lateral direction. This combustion device is provided with a non-porous part provided between the air holes having a small interval therebetween and a non-porous part provided at a distance larger than the vertical distance between the air holes provided below the inner flame cylinder.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on FIG. 2.

1 is a cylindrical 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;
Further, by moving the gap formed by the core guide cylinder 5 and the core outer cylinder 6 up and down, the evaporation area of the fuel is changed and the amount of combustion is varied. Above the outer flame cylinder 3, a red-hot part 7 made of a wire mesh or a punched plate is provided, and this red-hot part 7 has a large number of through holes 7a.
We have set up A secondary flame ring 8 is provided at the upper end 7b of the red-hot part 7 and has a constricted part 8a bent toward the upper part of the inner flame tube 2. Further, a gap 8b is provided between the upper end 7b of the glowing part 7 and the constricted part 8a.
A portion of the through hole 7a faces this gap 8b. A plurality of air holes 2a are provided on the side wall of the inner flame tube 2, and an air hole 2b with the largest opening area among the air holes 2a is provided at the top of the inner flame tube 2, and this air hole 2b is made long. It is formed into a hole shape and is inclined to face a part of the secondary flame ring 8. The lower side wall of the air hole 2b is a non-porous portion 2c without the air hole 2a.
The vertical width of this non-porous portion 2c is the width of the non-porous portion 2c.
It is larger than the distance in the vertical direction of the array of air holes 2a provided below c, and is provided opposite to the upper part of the red-hot part 7 above the outer flame cylinder 3. Further, a plurality of air holes 2d are provided directly below the non-porous portion 2c, each having a lateral distance smaller than the lateral distance of the air holes 2a provided below the non-porous portion 2c. A plurality of air holes 3a are provided in the side wall of the outer flame tube 3. Reference numeral 9 denotes an outer cylinder on which a transmission cylinder 10 made of a heat-resistant glass cylinder is placed. The inner flame tube 2, outer flame tube 3, and outer tube 9 described above are assembled concentrically from the inside to the outside using a cross pin 11. Above the inner flame cylinder 2, there is a top plate 2e and a plurality of relatively large openings 12.
An upper incandescent body 13 is provided. The upper incandescent body 13 is fixed around a main exhaust gas passage 14a that is largely opened in the center of the chimney top 14,
A plurality of auxiliary exhaust gas passages 14b are provided around the main exhaust gas passage 14a. A transmission tube 10 placed on the outer tube 9 at the end of this chimney top 14
is supported. 15 is a secondary flame formed on the secondary flame ring 8.

In the above configuration, when the lamp wick 1 is ignited, combustion starts, and the high-temperature combustion gas generated by combustion passes through the combustion chamber 4, the main exhaust gas passage 14a of the chimney top 14, and the auxiliary exhaust gas passage 14b, creating an upward air current, which is necessary for combustion. Air flows in through the air holes of the inner flame tube 2 and the outer flame tube 3, the through holes 7a of the red-hot part 7, and the like. Further, the lamp wick 1 is supplied with airflow and the heat of the flame held in each air hole to evaporate the liquid fuel and sustain combustion. In steady combustion, the mixture of liquid fuel and air evaporated from the lamp wick 1 rises in the combustion chamber 4,
Flames are formed at appropriate locations in the air holes 2a, 2b, 3a of the inner flame tube 2, outer flame tube 3, and through hole 7a of the red-hot part 7. At this time, since the non-porous part 2c is provided,
The air-fuel mixture and air that have not been completely burned to this height have no place to form a flame, so they are given sufficient time and an appropriate temperature to mix, and the uppermost air hole 2b of the inner flame cylinder 2 and the secondary flame ring 8 to the gap 8b,
It is pushed up in a nearly premixed state, and can eventually burn as a premixed blue flame, preventing soot generation. In addition, the air hole 2d directly below the non-porous part 2c
provides uniform air and temperature to the air-fuel mixture rising along the non-porous part 2c, creating a good premixing state, and since the non-porous part 2c is opposed to the upper part of the red-hot part 7, the red-hot Since the air-fuel mixture is also dilute, a large amount of air flows through the through hole 7a at the top of the section 7, and the temperature is also lower than other parts, promoting premixing and producing a good blue flame.

Effects of the Invention According to the combustion apparatus of the present invention, the following effects can be obtained.

(1) A non-porous part is provided at the top of the inner flame tube to eliminate the flame between them, giving time to promote the mixing of liquid fuel vapor and air, creating a good premixing state, and reducing the number of secondary flames. A blue flame is formed, and soot generation can be prevented.

(2) A non-porous part is provided at the top of the inner flame tube to eliminate the flame in between, which suppresses excessive overheating of the air-fuel mixture, prevents the generation of yellow flame due to thermal decomposition, and improves premixing. A clear blue flame can be obtained and soot generation can be prevented.

(3) A non-porous part is provided at the top of the inner flame tube to eliminate the flame between them, which suppresses excessive heating of the air-fuel mixture, prevents rapid expansion of the air-fuel mixture, and allows the inner flame tube to reach its maximum height. It mixes efficiently with the air flow from the upper air hole and the secondary flame ring, promotes premixing, turns the secondary flame into a blue flame, and prevents soot generation.

(4) Since the non-porous part is placed opposite the top of the red-hot part, a large amount of air flows in through the holes in the red-hot part.
A low-temperature air-fuel mixture can be obtained, a good premixed state can be created, the secondary flame can be turned into a blue flame, and soot generation can be prevented.

(5) Since the air hole with the largest opening area among the air holes in the inner flame cylinder is provided above the non-porous part, a secondary flame is formed, and the premixture is combusted here as a blue flame. At the same time, flame holding is stabilized and good combustion characteristics are obtained.

(6) The air hole with the largest opening area among the air holes in the inner flame cylinder is placed opposite the secondary flame ring, so that fresh air collides with the premixture from both directions, promoting mixing and promoting the secondary flame ring. The flame can be formed all over the combustion chamber, preventing the emission of unburned remains and improving the combustion characteristics.

[Brief explanation of drawings]

Figure 1 is a partial sectional view of a conventional combustion device;
The figure is a sectional view of a combustion device showing an embodiment of the present invention. 2... Inner flame tube, 2a... Air hole of inner flame tube, 2b
...The air hole with the largest opening area in the inner flame cylinder, 2c...
Non-porous part, 2d...air hole with small lateral distance, 7
...Red hot part, 7a...Through hole, 8...Secondary flame ring.

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 air holes provided above the inner flame tube, An air hole having the largest opening area among the air holes of the inner flame tube, a red-hot part provided at the top of the outer flame tube, a secondary flame ring provided at the upper end of the red-hot part, and the second flame ring. A plurality of air holes provided in the inner flame tube below the next flame ring and with small lateral spacing, and an air hole with the largest opening area of the inner flame tube and an air hole with small lateral spacing. established between
A combustion device comprising: a non-porous portion provided below the inner flame cylinder and provided with a gap larger in the vertical direction of the air holes.