JPS6399407A - Kerosene burner of evaporation type - Google Patents

Abstract

PURPOSE:To prevent oil from dripping in an evaporating cylinder at the initial stage of ignition, by designing the evaporating cylinder in such a manner that the internal edge of the annular flange of an evaporating cylinder is to be positioned to the external edge of a spray pattern of fuel oil from a nozzle. CONSTITUTION:Because the temperature in an evaporating cylinder 3 is low at the initial stage of ignition, particles of kerosene sprayed from a nozzle 4 cannot be evaporated sufficiently after hitting on the inside wall of an evaporating cylinder 3, dripping down along the inside wall of a cylinder 3. The more the sprayed rate is, the more the dripping rate is. But in this case, the evaporating cylinder is designed in such a manner that the external edge of a spray pattern 15 of fuel oil from the nozzle 4 is to be positioned to the internal edge of the annular flange 11 of an evaporating cylinder 3. Accordingly the sprayed fuel can hit on the whole internal surfaces of an evaporating cylinder 3. The evaporating rate of kerosene per unit area on the inside wall of an evaporating cylinder 3 is decreased, as a result, oil dripping at the initial stage of ignition can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to prevention of oil dripping at the initial stage of ignition of a kerosene vaporizing burner.

(Prior art) A conventional kerosene vaporizing burner is disclosed in Japanese Patent Application No. 59-160018.
As described in No. 1, the spray from the nozzle hits the inner surface of the bowl-shaped vaporizer cylinder.

[Problem that the invention seeks to solve]

In the above-mentioned prior art, the V'i vaporization cylinder is not sufficiently heated at the initial stage of ignition, resulting in insufficient vaporization, which tends to cause the atomized oil to drip from the inner surface of the vaporization cylinder, causing kerosene to scatter outside the burner.

In addition, oil drips are more likely to occur if the amount of combustion is large.

An object of the present invention is to prevent oil dripping at the initial stage of ignition.

[Means for solving problems]

The above object is achieved by arranging the vaporizer so that the inner edge of the ring-shaped collar of the vaporizer cylinder is located on the outer edge of the four patterns of jets from the nozzle.

(Effect) Considering the early stages of aging, the spray pattern from the nozzle hits the entire inner surface of the vaporizer cylinder, so the amount of evaporation of kerosene per unit area on the inner surface of the vaporizer cylinder is reduced, and therefore oil dripping at the initial stage of ignition is reduced. [Embodiment] The following is a diagram illustrating an embodiment of the present invention with reference to FIG. 1.
Here, a bowl-shaped vaporizing cylinder 3 is provided in the combustion cylinder 2, which has a spray hole l provided at the center of the bottom of the cylinder, with its opening edge facing the spray hole l. A combustion nozzle 4 and an air hole 5 are provided toward the combustion chamber. Kerosene is sprayed from the nozzle 4, while 9 air is supplied from the air hole 5 in an amount that brings the air-fuel mixture below the flammable range.After the kerosene is vaporized in the vaporizer tube a, it becomes an air-fuel mixture as shown by the arrow. As shown in A, the gas is guided to a gas passage 6 formed around the outer periphery of the vaporizing cylinder 3. The lower part of the combustion tube 3 (the position facing the upstream part 6A of the gas flow path 6) has an air hole 7, while the upper part of the combustion tube 3 (the position facing the downstream part 6B of the gas flow path 6) has an air hole 7. 8 are formed respectively, and the air flowing inside the outer cylinder 9 provided so as to surround the combustion cylinder 8 flows through these air holes 7,
8 so that it is supplied into the gas flow path 6.

Air holes 7f'i are provided at equal fractional bolts on the outer periphery of the combustion tube 2,
By the way, the total amount of air passing through air holes 7 and 5 is
The total amount of combustion air used for combustion in the burner according to this embodiment is set to be about /io, and the air supplied from the air hole 7 into the gas flow path 6 is sent from the vaporization cylinder 3. It has the function of promoting the vaporization of the mixed gas that has been mixed.

On the other hand, the number of air holes 8 is larger than the number of air holes 71, and the total opening area f′i of the air holes 8 is considerably larger than the total opening area of the air holes 7, which is 9/1o of the total amount of combustion air. A certain amount of air is supplied from this air hole 8 into the gas flow path 6.The air supplied from this air hole 8 has the function of flame-holding the mixed gas, and also directs the flame inward to vaporize it. It also has the function of promoting the sword mouth heat of tube 8.

The vaporizer tube 8 is fixed to the bottom surface of the combustion tube 2 by a support plate 10, and the open end 1 of the vaporizer tube 8 is provided with a ring-shaped collar 11 protruding into the gas flow path 6. This ring-shaped brim 11 has the function of causing the mixed gas flowing from the vaporization tube 8 to flow along the inner wall of the combustion tube 2 to promote mixing with 2X supplied from the air hole 7, and to prevent backfire. It functions as a flashback prevention plate.

An air chamber 12 for conveying kerosene having a nozzle 4 and an air hole 5 is provided surrounding the spray hole 1 provided at the bottom of the combustion tube 2, and an air rectification chamber 12 is provided in the upstream portion of the outer tube 9. The upstream portion of the outer cylinder 9 is connected to an air rectification chamber 13, from which combustion air 14 is supplied. Further, the outer edge of the kerosene spray pattern 15 from the nozzle 4 is set to hit the inner edge of the ring-shaped collar 11 of the vaporizing cylinder 3. Note that code 16
is a spark plug.

Next, the operation of the kerosene vaporizing burner according to this embodiment will be explained.

Combustion air 14 flows into air rectification chamber 13 .

After that, a flow 14A from the air hole 5 provided in the air chamber 121 passes around the nozzle 4 from the spray hole 1 to the vaporizing tube 8, and a flow 14B passes through the outer tube 9 from the air hole 7 to the inside of the combustion tube 2.
and a flow 140 that similarly passes through the outer cylinder 9 and reaches from the air hole 8 into the combustion cylinder 2.

The air 14A flowing from the spray hole 1 toward the vaporizer cylinder 8 is
The mixture becomes a mixture with the kerosene particles sprayed by the nozzle 4, overflows the inner wall E of the vaporizer tube 8, passes from the bottom of the vaporizer tube 8, passes through the outer circumference of the ring-shaped collar 11, and cleans onto the inner circumferential wall of the combustion tube 2. flows downstream.

At this time, the spark plug 16) is ignited, but the amount of air supplied from the air hole 5 is small, the amount of air mixture in the carburetor tube 8 is below the flammable range, and Since there is no flame stabilizing mechanism, the air-fuel mixture is guided to the gas flow path 6 on the outer periphery of the vaporizing tube 3 without flame stabilization inside the vaporizing tube 8. Then, the mixture reaches the gas flow upstream section 6Af, where air is supplied from the air hole 7 and a part of the mixture starts to burn, thereby preventing a fire. This fire promotes gasification of unburned kerosene particles in the air-fuel mixture, which reaches the downstream part 6B of the gas flow path, where a large amount of air is supplied from the air holes 8 and is completely combusted. Furthermore, the vaporizer tube 8 is heated by the fire, which promotes gasification of the kerosene particles in the vaporizer tube 3. The air-fuel mixture is passed through the ring-shaped brim 1 of the carburetor cylinder 3.
1, the flow is rectified along the inner circumferential wall of the combustion tube 2, and is completely mixed with the air supplied from the communication hole 7, thereby promoting combustion.

In addition, in the initial stage of ignition (in this case, the temperature of the vaporizer tube 8 is low, so the particles of kerosene sprayed from the nozzle 4 are insufficiently vaporized after hitting the inner surface of the vaporizer tube 8, and the inner curve of the vaporizer tube 3 The amount of dripping increases as the amount of spray increases. However, in this embodiment, the spray pattern 15 from the nozzle 4 is strained so that the outer edge of the spray pattern 15 is located at the inner edge of the ring-shaped collar 11 of the vaporizing cylinder 3. Therefore, the spray hits the entire inner surface of the vaporizing tube 8, reducing the amount of kerosene evaporation device per unit area on the inner surface of the vaporizing tube 8, and thus reducing oil dripping at the initial stage of ignition.

(Effects of the Invention) As explained above, according to the present invention, even when the amount of combustion increases, it is possible to reduce oil dripping at the initial stage of ignition.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a kerosene vaporizing type Par-6 showing an embodiment of the present invention.

Claims (1)

[Claims] 1. In a combustion cylinder with a nozzle arranged at the bottom, a bowl-shaped vaporizer cylinder with multiple legs protruding from the opening edge is installed on the bottom wall of the combustion cylinder facing the nozzle, and this vaporizer cylinder In a kerosene vaporization burner that forms a gas flow path around the outer periphery that guides the air-fuel mixture and stabilizes the flame by introducing combustion air through air holes provided in the combustion tube,
A kerosene vaporizing burner characterized in that a ring-shaped collar protrudes from the outer periphery of the opening edge of a vaporizing cylinder, and is arranged such that the inner edge of the collar is located at the outer edge of the spray pattern from the nozzle.