JPS602423Y2 - Forced vaporization combustion device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a forced vaporization combustion device that employs a swirl vaporization mixing method.

A conventional combustion device of this type is shown in FIGS. 1A and 1B.

In the figure, 1 is a combustion device main body, 2 is a heater embedded in the bottom wall of the main body 1, and the end protrudes from the main body 1.

3 is a primary air supply port formed in the side wall of the main body 1, 4 is a fuel injection nozzle, and 5 is a first mixing passage formed in an annular shape in the main body 1, which has an inlet portion 5a facing the fuel injection nozzle 4. There is.

Reference numeral 6 denotes a second mixing passage formed in an annular shape inside the first mixing passage 5 so that its center axis coincides with that of the first mixing passage 5, and directly communicates with a combustion section to be described later through an outlet portion 6a of the second mixing passage.

A partition wall 7 is formed integrally with the bottom wall of the main body 1 and partitions the first and second mixing passages 5 and 6.

8 is a communication hole that communicates the first and second mixing passages 5 and 6 in a spiral shape; 9 is a first burner plate that also serves as a wall surface of the first and second mixing passages 5 and 6, for example, a clay wall; A second burner plate 10 is located above the first burner plate 9, and a plurality of slit-shaped flame holes 11 are provided at equal intervals around the entire circumference.

12 is a flame hole formed between the first and second burner plates 9 and 10.

The first and second burner plates 9.10 constitute a combustion section.

13 is a wire mesh attached to the back surface of the second burner plate 10, 14 is a secondary air supply port provided in the center of the main body 1, and 15 and 16 are flames.

In such a conventional combustion device, fuel is injected from a fuel injection nozzle 4, and primary air is supplied from a secondary air supply port 3, and the inside of a first mixing passage 5 heated by a heater 2 is shown in FIG. 1B. The mixture is vaporized and mixed while rotating as shown by the arrow in the communication hole 8.
The mixture is introduced into the second mixing passage 6 through the same way, and is similarly swirled to promote vaporization and mixing.

The air-fuel mixture swirled in the first and second mixing passages 5.6 in this manner is injected into the combustion section through the outlet portion 6a of the second mixing passage 6.

Then, it blows out from the flame holes 11 and 12, and the secondary air supply port 1
It mixes with the secondary air from 4 and is ignited by an ignition device (not shown) to form flames 15 and 16.

Then, the main body 1 is heated by the flame 16, and the heat of vaporization of the fuel and the amount of heat necessary for heating the air-fuel mixture are recovered.

The wire mesh 13 is used to prevent back combustion in the flame hole 11.

However, in the conventional combustion apparatus, it is difficult to completely bring the contact surfaces between the first burner plate 9 and the partition wall 7 into close contact with each other, and mist may flow out from the gap between the contact surfaces.

In addition, due to the influence of the adhesion, heat transfer to the partition wall 7, especially the part near the first burner plate 9, is not sufficient, and foreign matter 17 such as tar adheres to the wall surface as shown in FIG. 1A, causing extinguishing. There were drawbacks such as the generation of odor at times.

The present invention was developed in view of the above-mentioned circumstances, and eliminates the conventional defect by integrally molding the partition wall between the first annular passage and the second annular passage provided inside the passage with the burner plate. The purpose is to provide a forced vaporization combustion device that eliminates the problems.

Hereinafter, one embodiment of the present invention will be described based on FIG. 2.

Incidentally, the same elements as in FIG. 1 are given the same reference numerals and their explanations will be omitted.

In FIG. 2, 20 indicates the first and second mixing passages 5, 6.
A partition wall 21 that partitions both the passages 5 and 6 is integrally formed with one wall surface of the burner plate, for example, a first burner plate which also serves as a clay wall.

The partition wall 21 extends to the bottom wall of the main body 1.

Further, 13 is a wire mesh attached to the back surface of the second burner plate 10.

In the combustion device having such a configuration, when fuel and primary air are respectively introduced into the first mixing passage 5 from the fuel injection nozzle 4 and the primary air supply port 3, the fuel and primary air are vaporized and mixed while being mixed in the first mixture. From the mixing passage 5 to the second mixing passage 6
It spins around in a spiral.

The mixed air flow introduced into the second mixing passage 6 is
Conventionally, the air is supplied to the combustion section via the air outlet a, jetted out from the flame holes 11.12 of the first and second burner plates 20.10, mixed with the secondary air, and combusted to form the flame 15.16. The same is true.

However, in the combustion device of the present invention, since the partition wall 21 of both mixing passages 5.6 is integrally formed with the first burner plate 20, the thermal conductivity from the first burner plate 20 to the partition wall 21 is low. The performance is extremely good, and there is almost no adhesion of foreign substances such as tar to the partition wall 21 due to insufficient heat, and there is no mist flowing out from the first mixing passage 5 to the second mixing passage 6. .

Furthermore, a sufficient amount of heat is supplied to the partition wall 21, and the efficiency of vaporizing the fuel or preheating the air-fuel mixture in the mixing passages 5 and 6 can be greatly improved.

Therefore, the vaporization surface area of both mixing passages 5.6 can be reduced, and the combustion apparatus can be made more compact.

The wire mesh 13 can prevent back combustion of the flame in the flame hole 11 of the second burner plate 10.

As described above, according to the present invention, the partition wall between the first annular passage and the second annular passage formed inside the annular passage is integrally molded with the first burner plate, so that the partition wall has sufficient space. It is possible to supply heat, prevent foreign matter such as tar from adhering to the partition wall surface, and greatly improve the vaporization efficiency of the annular passage.

Therefore, the vaporization surface area of both the passages can be reduced, and the combustion device can be made more compact.

Furthermore, mist does not flow into the inner second annular passage, and a good air-fuel mixture can be supplied to the combustion section, resulting in stable combustion.

The wire mesh interposed in the flame hole formed in the second burner plate has the effect of preventing back combustion of the flame in the flame hole.

[Brief explanation of the drawing]

1A and 1B show a conventional combustion device, A is a longitudinal sectional view, B is a plan view excluding the combustion part, and FIG. 2 is a longitudinal sectional view showing an embodiment of the combustion device of the present invention. . 1... Combustion device main body, 2... Heater, 5... First
6... Second mixing passage, 13... Wire mesh, 20... First burner plate, 21... Partition wall.

Claims (1)

[Scope of utility model registration request] In the forced vaporization type combustion device, the combustion device is provided with a heater in the combustion device main body, and the fuel is vaporized and supplied to the combustion section while swirling and mixing with the primary air in an annular passage formed in the main body. The first annular passage has a first annular passage facing a fuel injection nozzle that injects fuel, and a second annular passage formed inside the annular passage and communicates with the first annular passage in a spiral shape. and a partition wall that partitions the second annular passage,
The combustion section is formed by integral molding with a first burner plate that also serves as a wall surface of the annular passage and has air-fuel mixture circulation holes opened in the upper part of the second annular passage. a second burner plate disposed above the first burner plate at a constant interval from the first burner plate; A flame hole with a wire mesh interposed therein to prevent flame back combustion is formed at the position where the
and a forced vaporization type combustion device, characterized in that a flame hole is formed between the sides of the second burner plate.