JPS605220Y2 - liquid fuel combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device that vaporizes liquid fuel, premixes a portion of air, and then combusts the liquid fuel.

The present applicant previously proposed a liquid fuel combustion device (
Special Publication No. 53-25364) was proposed.

In this device, the fan of the blower is also used as the vaporizing disk a, and the liquid fuel supplied through the fuel pipe is evaporated and vaporized while being directed toward the outer periphery along the vaporizing disk a, which rotates around an axis C. The air-fuel mixture is ejected from the outlet e of the air-fuel mixture jetting passage formed by the outer peripheral edge a' of a and the wall surface d' of the stationary inner case d, ignited by the spark plug f, and combusted within the outer case g. However, this device has the drawback that when the air and fuel are at low temperatures during ignition, the combustion speed is slow, and as a result, the flame tends to lift (a phenomenon in which it is blown out), making combustion unstable.

This invention was devised to eliminate the above-mentioned drawbacks.
By arranging multiple airflow disturbance members outside of the air-fuel mixture outlet, the purpose is to prevent flame lifting and stabilize combustion even when the air-fuel mixture is at a low temperature. .

Embodiments of the present invention will be described below with reference to FIGS. 2 to 4.

In the figure, F is a blower fan installed horizontally and rotatably around a shaft 1, 2 is a flat upper disc, 3 is a lower disc, and 4 is a blade.

A cylindrical portion 5 whose diameter gradually increases upward is formed integrally with the outer circumference of the lower disk 3, and the lower disk 3 has a cylindrical portion 5 that gradually increases in diameter toward the center. It is sloped downward.

The center part of this lower disk 3 is concave downward,
A circular air intake port 6 is provided at the center of the recessed circular flat plate portion 3a.

7 is a fuel pipe inserted from this air intake port 6;
The fuel is supplied onto a circular flat plate part 3a around the periphery of the evaporation disc B.
is formed.

Reference numeral 8 denotes a hollow disk body with a larger diameter than the vaporizing disk B, and has a large number of secondary air jet holes 8b distributed in its outer peripheral wall 8a, and a circular opening formed in its bottom plate 8C. This is an inner case in which a cylindrical part 8d is provided protruding from the periphery to fit inside the cylindrical part 5 of the vaporization disk B with a small gap.

9 is an outer case that encloses the vaporizing disk B and the inner case 8;
Inner case 8 is fixed to outer case 9 via four pillars 10.

11 is a spark plug attached to the outer case 9, and 12 is a hood connected to the outer case 9.

In the present invention, as shown in detail in FIG. In the embodiment, 10 airflow disturbance members 14 (see FIG. 3) are appropriately distributed and protruded downward from the annular bottom plate 8c of the inner case 8.

The airflow disturbance member 14 may be of any shape as long as it has the effect of disturbing the airflow, but in this embodiment, it has a diameter of 4m on a circumference of 1757rgn.
Then, a pin 14 with a protruding length of 8 mm was provided protruding from one cap position as shown in FIG.

In FIG. 3, the pins 14 are not equally spaced because the spark plug 1
This is due to the influence of the position of 1 and the four pillars 10.

Next, the liquid fuel combustion operation of the device of the present invention having the above-described structure will be explained.

When the shaft 1 is rotated, the fan F rotates and acts just like a turbo fan, sucking air through the central suction port 6 and discharging it in a centrifugal direction with the blades 4.

The exhaled air is divided into two streams by the cylindrical part 8d of the inner case 8 inserted along the inner surface of the cylindrical part 5 of the vaporizing disk B, and one of the air is discharged from the vane 4. Then, the vaporized gas is ejected into the outer case 9 through the gap formed between the cylindrical portion 5 of the vaporization disk B and the cylindrical portion 8d of the inner case 8, and the other vaporized gas is ejected from the vane 4 and then enters the inner case 8. , is ejected into the outer case 9 from the secondary air ejection hole 8b.

When liquid fuel is discharged from the fuel pipe 7 in the above-mentioned state, it spreads along the upper surface of the lower disk 3 from the flat plate portion 3a of the vaporization disk B in the outer circumferential direction, and the inner surface of the outer cylindrical portion 5 is affected by centrifugal force. It rises and is sprayed into the outer case 9 from the outer peripheral edge 5a by centrifugal force to atomize and atomize it.

When this is ignited with the ignition plug 11 inserted into the outer case 9, the flame burns in the space formed by the outer case 9, the vaporizing disk B, and the inner case 8.

This combustion heat heats the outer peripheral surface of the cylindrical portion 5 of the vaporization disk B since it is exposed in the flame.

At this time, the position of the open end of the cylindrical part 8d of the inner case 8 inserted into the vaporization disk B is such that the liquid fuel, which is diffusing outward on the vaporization disk surface by centrifugal force, evaporates and vaporizes. For this reason, by narrowing the gap between the bottom of the outer case 9 and the vaporization disk B, the heat of combustion is directed to the bottom of the vaporization disk B, and the cylindrical shape of the vaporization disk B is shape part 5
You need to make sure that you receive it mainly.

Therefore, the liquid fuel that diffuses into the inner surface of the cylindrical portion 5 of the vaporization disk B is evaporated and vaporized to become gasified fuel, and is pre-combusted between the inner case 8 and the cylindrical portion 5 of the vaporization disk B. It mixes with a part of the necessary air and is ejected from the gap formed between the cylindrical portion 8d of the inner case 8 and the cylindrical portion 5 of the vaporization disk B to be gasified and burned.

A part of the mixed gas ejected from the ejection port 13 between the outer peripheral edge 5a of the cylindrical portion 5 of the vaporization disk B and the bottom plate 8c of the inner case 8 is ejected while forming a vortex by the airflow disturbance member 14. and burn it.

This flame has a radial flow because the vaporizing disk B is rotating.

The air flow that is discharged from the vanes 4 into this radially flowing cylindrical primary flame and becomes static pressure in the bag-shaped inner case 8 is perforated on the circumferential surface of the inner case 8. Since the secondary air is ejected in the centrifugal direction from the secondary air ejection holes 8b, the primary flame and the secondary air intersect at almost right angles, promoting mixing and achieving complete combustion.

As mentioned above, in the device of the present invention, a plurality of airflow disturbance members 14 are appropriately distributed and provided on the outside of the air-fuel mixture jet port 13 that is premixed with a part of the amount of air required for combustion. Disturbances such as vortices occur in the flow of the air-fuel mixture passing through the air-fuel mixture, resulting in good mixing of the air-fuel mixture.

For this reason, in the conventional device shown in Figure 1, lifting was likely to occur when the air and fuel were at low temperatures because the propagation speed of combustion was low, but with the device of the present invention, lifting occurred even when the air and fuel were at low temperatures. It has the excellent effect of providing stable combustion without causing any burns.

[Brief explanation of drawings]

Fig. 1 is an elevational sectional view of the conventional device, Fig. 2 is an elevational sectional view of the device of the present invention, Fig. 3 is a bottom view of the inner case, and Fig. 4 is an elevational sectional view of the device of the present invention.
It is an AA sectional view of the figure. F...Fan, 1...Axis, 2...
...Upper disc, 3...Lower disc, 3a...
...Circular flat plate part, 4...Blade, 5...
Cylindrical part, 6... Air intake port, 7...
Fuel pipe, B... vaporization disk, 8... inner case, 8a... outer peripheral wall, 8b... secondary air jet hole, 8c... ...Bottom plate, 8d...
Cylindrical part, 9... Outer case, 10...
Pillar, 11... Spark plug, 12... Hood, 13... Mixture outlet, 14...
Airflow disturbance member.

Claims (1)

[Scope of utility model registration request] In a combustion device in which a mixture jet is formed by the outer peripheral edge of a rotating vaporization disk and the stationary wall of an inner case,
A liquid fuel combustion device comprising a plurality of airflow disturbance members arranged outside the air-fuel mixture jet port.