JPH0113259Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a liquid fuel vaporizing burner used in domestic water heater boilers and the like.

(Prior Art) Conventionally, various structures have been known as liquid fuel vaporization type burners, and the applicant of the present application has also filed an application for the structure shown in FIG. 4 as Japanese Patent Application No. 174975/1982.

To explain what is shown in FIG. 4, there is a fuel nozzle 1, a vaporizer tube 2 made of porous ceramic provided in front of the nozzle so that the atomized fuel sprayed from the fuel nozzle 1 collides with the inner circumferential surface, and a vaporizer tube 2. It is equipped with a rectifier cup 4 provided at the front end opening of the fuel nozzle 1, and an air outlet 5 provided around the nozzle 1 to temporarily remove oil droplets ejected from the fuel nozzle 1 and hitting the inner surface of the vaporization tube 2. Let it soak into the inside of the vaporizer cylinder 2,
This is evaporated using the heat of the vaporization tube 2 heated by combustion heat and released as steam, and high-temperature gas is sucked in from the combustion gas suction port 6 at the rear of the vaporization tube 2 by the suction force generated by blowing out the air. The combustion gas promotes the gasification of fuel.

In the one shown in FIG. 4, an igniter 3 for ignition is provided in front of the fuel nozzle 1 and is provided above the horizontal line passing through the center of the carburetor cylinder 2. Therefore, the flame ignited by the ignition of the initial combustion igniter is formed above the horizontal line.

On the other hand, in the early stages of combustion, oil droplets that hit the inner surface of the vaporizer cylinder are not completely absorbed by the vaporizer cylinder, and flow down along the inner surface of the vaporizer cylinder without being completely vaporized.

Therefore, the flame ignited by the ignition of the igniter spreads downward following the flow of oil droplets, but it cannot catch up with the flow of oil droplets, and the oil droplets drip from the carburetor cylinder and reach the lower part of the combustion chamber. This may cause problems such as accumulation.

(Technical Problem to be Solved by the Invention) A technical problem to be solved by the present invention is to ignite oil droplets flowing down along the inner surface of the vaporizer cylinder from below during the initial stage of combustion.

(Means for Achieving the Technical Problem) The technical means taken by the present invention to achieve the above-mentioned technical problem is to provide a vaporization tube in front of the fuel nozzle surrounding the fuel spray area of the nozzle. In a liquid fuel vaporization burner that heats with combustion heat and vaporizes oil droplets sprayed onto the inner surface of the vaporization cylinder, an ignition igniter is provided below the horizontal line passing through the axis of the vaporization cylinder, and an igniter is installed in front of the igniter. , a swirling blade having a wing piece that swirls the air supplied along the circumferential surface of the nozzle and a contracting flow forming part that converges the air flow toward the center is provided, and a fire transfer plate is provided corresponding to the igniter. be.

(Function) The spark from the ignition igniter flies below the horizontal line passing through the axis of the carburetor cylinder and ignites below the horizontal line, causing oil droplets that are not completely vaporized and flow down along the inner surface of the carburetor cylinder to be ignited. The fire spreads from below to above.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The burner indicated by the symbol A in the drawings includes a fuel nozzle 1, an air outlet 5 provided around the fuel nozzle 1 surrounding the nozzle 1, and a fuel nozzle 1.
an ignition igniter 3 provided in front of the nozzle 1 and facing the nozzle 1; and a vaporizer tube 2 provided in front of the fuel nozzle 1 surrounding the fuel spray area of the nozzle 1;
It is equipped with a rectifying cup 4 provided loosely at the outlet of the vaporizing tube 2 and a flame-holding ring 7 provided in front of the rectifying cup 4, and a combustion gas suction port 6 is provided at the rear of the vaporizing tube 2. ing.

The air outlet 5 passes through the center of the mounting flange 8 and is formed into a straight cylindrical shape, and the rear part communicates with the air passage 10 of the blower 9, and the front end has blades for swirling the air supplied from the blower 9. Piece 11
A swirler blade 11 having a contracted flow forming part 11b that converges the flow of air toward the center is provided.

The fuel nozzle 1 is held by a nozzle holder 12 and provided within the air outlet 5 coaxially with the air outlet 5,
The front end opening of the blower outlet 5 faces the center of the vaporizing cylinder 2.

The vaporizing cylinder 2 has the shape shown in the figure, that is, it has a straight or slightly tapered cylindrical part 2a at the rear, and a tapered tubular widening part 2b that continues from the front end of the cylindrical part 2a and extends forward in a widening shape. The nozzle 1 is held in front of the fuel nozzle 1 by a mounting cylinder 13 which is fitted into the cylindrical part 2a and has leg parts 13a fixed to the mounting flange 8 by screws. Installed coaxially.

The combustion gas suction port 6 provided at the rear of the vaporization tube 2 is formed by a gap between the rear end of the vaporization tube 2 and the front end of the air outlet 5.

A pair of ignition igniters 3 are provided with the fuel nozzles 1 positioned between the swirling blades 11 and below the horizontal line so that sparks can be ejected below the horizontal line passing through the axis of the vaporizing cylinder 2.

The rectifier cup 4 is formed into a roughly conical shape with an open bottom, and its water portion is inserted into the vaporizer tube 2 with the convex surface facing the vaporizer tube 2 side, and an annular shaped cup is formed between the outer circumference and the inner circumference of the vaporizer tube 2. Bolt nut 15 with circumferential gap 14
Connect and fix it to the carburetor cylinder 2.

Further, an appropriate number of small holes 4' are bored in the rectifying cup 4 at required locations parallel to the cup axis.

Above, the vaporizer tube 2 and rectifier cup 4 are made of silicon 42
%, silicon nitride 18%, and clay 40% as raw materials, it is a ceramic product with a porosity of 50 to 20%.

The flame-holding ring 7 is welded and fixed to a column 16 raised from a mounting flange 8, and is provided coaxially with the column in front of the rectifying cup 4.

In the figure, reference numeral 17 corresponds to the igniter 3 and is a fire transfer plate provided in front of the igniter 3 below the horizontal line passing through the two axes of the carburetor cylinder, 18 is a red flame detection rod, and 19 is a flame rod.

Moreover, 20 is an electromagnetic pump provided in the middle of the oil supply pipe 21 that connects the fuel spray nozzle 1 and the oil supply source, and 22 is a strainer.

To explain the combustion state of the burner A, sparks generated by the initial combustion of the igniter 3 fly downward from the horizontal line passing through the axis of the vaporizer cylinder 2, and are blown out from the air outlet 5 below the horizontal line. The mixture of air and fuel sprayed from fuel nozzle 1 is ignited, and the flame is emitted into vaporizer tube 2.
The oil droplets that hit the inner surface and flow down along the inner surface of the vaporizer tube 2 without being fully absorbed or vaporized are ignited from below, and the flame spreads upward along the flow of the oil droplets, forming a yellow flame inside the vaporizer tube 2. .

At this time, since the air-fuel mixture is retained behind the fire transfer plate 17 provided in front of the igniter 3, ignition is ensured, and the blown air is swirled by the swirling vane 11 provided at the air outlet 5. Moreover, since the flow converges toward the center, the flame ignited by the spark of the igniter 3 is swept downward by the vortex of air, so that the oil droplets flowing down the inner surface of the vaporizer cylinder 2 are reliably ignited from below.

On the other hand, due to the suction action of the surrounding air accompanying the blowing of air from the air outlet 5, a circulation flow is generated from the outlet of the vaporization cylinder 2 through the combustion gas suction port 6 and into the inside of the vaporization cylinder 2. The combustion gas is sucked into the vaporization cylinder 2, and the atomized fuel is instantly vaporized by its heat.

Also, among the sprayed fuel, oil droplets that have not been vaporized by the sucked combustion gas collide with the inner circumferential surface of the vaporizer tube 2, especially the inner circumferential surface of the expanded portion, but since the vaporizer tube 2 is made of porous ceramic, However, since the vaporizing cylinder 2 is at a high temperature due to convective heat transfer by the high-temperature combustion gas, the inhaled fuel quickly evaporates and vaporizes.

Thus, the gasified fuel is thoroughly mixed with air, becomes a mixture, and is discharged from the outlet of the carburetor cylinder 2.

On the other hand, the yellow flame inside the vaporizer cylinder 2 moves to the downstream part of the rectifier cup 4 at the same time as the combustion gas is sucked in, where the air-fuel mixture ignites and becomes a blue flame.

Furthermore, the unburnt gas that was not ignited at the end of the rectifier cup 4 flows along the inner and outer circumferential surfaces of the flame-holding ring 7,
It ignites behind the flame holding ring 7 and becomes a blue flame.

(Effect) As mentioned above, in this invention, the ignition igniter is installed below the horizontal line passing through the axis of the carburetor cylinder, so
The spark from the igniter flies below the horizontal line and is ignited below this horizontal line.In the early stage of combustion, the oil droplets that are not absorbed into the carburetor cylinder and flow down along the inner surface of the carburetor cylinder without being completely vaporized are exposed from below. The flames spread upward.

In addition, a spark transfer plate is provided in front of the igniter, as well as a swirling blade having blades and a contracted flow forming part, so that the air-fuel mixture accumulates behind the flame transfer plate, improving ignition performance and blowing air out. Since the flow swirls and converges toward the center, and the flame ignited by the spark of the igniter is swept downward, it is possible to ensure that the oil droplets flowing down the inner surface of the vaporization cylinder are ignited from below.

Therefore, it is possible to prevent inconveniences such as oil droplets dripping into the carburetor cylinder and collecting in the lower part of the combustion chamber.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a liquid fuel vaporizing burner showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a rear view partially cut away. FIG. 4, shown cut away, is a sectional view showing an example of a conventional liquid fuel vaporization burner. DESCRIPTION OF SYMBOLS 1... Fuel nozzle, 2... Carburizing cylinder, 3... Igniter for ignition, 11... Swivel blade, 11a... Wing piece, 11b... Contraction forming part, 17... Fire transfer piece.

Claims (1)

[Scope of utility model registration request] In a liquid fuel vaporization type burner, a vaporization cylinder is provided in front of the fuel nozzle surrounding the fuel spray area of the nozzle, and the vaporization cylinder is heated by combustion heat to vaporize oil droplets sprayed on the inner surface of the vaporization cylinder. An ignition igniter is provided in front of the nozzle below the horizontal line passing through the axis of the carburetor cylinder, and further in front of the igniter are blades that swirl the air supplied along the nozzle circumference and direct the air flow toward the center. A liquid fuel vaporizing type burner comprising a swirling blade having a condensing flow forming part that converges the flow, and a fire transfer plate corresponding to an igniter.