JPS5833443B2 - atomization device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an atomizer that atomizes a liquid and mixes the atomized particles with blowing gas to form a multiphase fluid, and particularly for atomizing liquid fuel in a liquid fuel combustion device. The present invention also relates to an atomization device that mixes the atomized fuel with blown combustion air to form a multiphase gas and sends it to a combustion section.

In hot water boilers, hot air heaters, etc. that burn liquid fuel and use the thermal energy for hot water supply, space heating, and other purposes, the fuel is atomized and the atomized fuel is used to improve the combustion characteristics. A method that mixes it with air and burns it is often used.

Various methods have been used in the past to achieve atomization of liquid fuel, but all of them have complicated structures and often have various inconveniences, including production accuracy and manufacturing cost.

FIG. 1 shows a typical conventional air impact type spray nozzle.

The liquid fuel coming out of the oil nozzle 1 collides with the air swirled by the swirling vane 2 at the air nozzle/I/3 to create a thin oil film, and this oil film is further reduced to fine particles by the air jetted from the outer mixing nozzle 4. become

Because of this configuration, the structure of the nozzle is complicated,
In addition, there were other disadvantages such as the need for a high-pressure blower to supply combustion air.

FIG. 2 shows another conventional example of a 50-tali burner in which the atomizing tube is rotated at high speed to atomize the oil.

The liquid fuel supplied from the main shaft hollow part 12 and exiting to the inner surface of the atomizing tube 13 sticks to the inner surface due to the rotation of the atomizing tube and flows out toward the tip. It mixes with the air sent by and becomes atomized.

In this case as well, the structure is complicated, the main shaft is long, and a large space is required in the axial direction.

Therefore, in view of the above-mentioned conventional drawbacks, the present invention has a very simple structure and aims to obtain good spray characteristics. Furthermore, it is intended to be used for atomizing and atomizing liquid fuel.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 3 to 5, 21 is a scirocco 77, which includes a motor 22 and an impeller 23 attached to the rotating shaft of the motor 22.
and a casing 24.

The casing 24 is provided with an air suction port 25 at a position facing the center of one side of the impeller 230, a casing passage 26 is formed on the outer periphery of the impeller 23, and a discharge port 27 is provided at the end of the casing passage 26. .

The impeller 23 has an opening for taking in air at the center of one side on the suction port 25 side, and a truncated conical protrusion 28 that bulges toward the opening side is formed on the other side. , a portion extending from the peripheral edge of the flat top surface of this truncated conical protrusion 28 to the side peripheral surface has an impeller 23 extending radially toward the outer circumferential direction and having a lower end thereof.
A large number of flow guide grooves 29 are formed which are curved so as to be shifted in the zero rotation direction.

Further, the motor 22 is located in a space on the backside formed by the protrusion 28.

Reference numeral 30 denotes a liquid fuel supply pipe, the tip of which passes through the suction port 25 and opens to face a portion of the periphery of the flat top surface of the truncated conical projection 28 of the impeller 230.

In the above configuration, when the impeller 23 is rotated in the direction of arrow a by the motor 22, the liquid fuel dripped from the liquid fuel supply pipe 30 is mainly caused by the centrifugal force of the impeller 23 to flow into the flow guide groove provided in the protrusion 28. 29 and is blown toward the outer circumference.

Since the effect of the centrifugal force increases as the distance from the center of the impeller 23 increases, the liquid fuel flowing through the flow guide groove 29 is atomized toward the outer periphery and sprayed from the outer part of the impeller 23 into the casing passage 26. It mixes with air to become a flammable gas, which is discharged from the discharge port 27.

As described above, according to the present invention, liquid such as liquid fuel can be effectively sprayed with a very simple configuration without using special parts such as a sprayer or a swirler as in the past.

Furthermore, since the configuration is simplified, the resistance to blowing air etc. is also extremely small, and as a result, the blowing function is smaller than that of conventional products, making it possible to downsize the equipment and reduce noise.

In addition, since one side of the impeller opposite to the suction port protrudes toward the suction side in a substantially truncated conical shape, the motor can be installed in the space created on the backside, which increases the overall size of the fan. can be made smaller.

Furthermore, since a large number of flow guide grooves are provided radially on the circumferential side of the truncated conical projection, when the dropped liquid is directed toward the outer circumference due to centrifugal force, it is blown away toward the outer circumference while passing through the flow guide grooves. As a result, the particle size of the atomized particles can be made almost uniform, and the atomization characteristics are good.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view showing a typical conventional air impact type spray nozzle, Fig. 2 is a partial cross-sectional view showing the same < conventional typical rotary burner, and Fig. 3 is an embodiment of the present invention. FIG. 4 is a partially cutaway plan view in the horizontal direction of the atomization device in the example, FIG. 4 is a sectional view in the vertical direction, and FIG. 5 is a plan view of the impeller. 21... Scirocco fan, 22... Motor, 23... Impeller, 24... Casing, 25... Suction port, 2T. ...Discharge port, 28...Protrusion, 29...Flow guide groove, 30...Liquid fuel supply pipe.

Claims (1)

[Scope of Claims] 1. A scirocco fan having a gas suction port and a gas discharge port, and a liquid supply pipe for supplying liquid to an impeller of the scirocco fan, wherein the impeller is located on the side opposite to the suction port side. A substantially truncated conical protrusion is formed on one side of the protrusion and protrudes toward the suction port, and a large number of flow guide grooves are provided radially on the circumferential surface of the protrusion, and the tip of the liquid supply pipe is connected to the protrusion. An atomizing device characterized by having an opening facing a position away from a center of rotation on a flat top surface. 2. The atomization device according to claim 1, wherein the liquid is liquid fuel, the gas is combustion air, and the atomization device constitutes a liquid fuel atomization device in a liquid fuel combustion device. 3. The atomization device according to claim 1 or 2, wherein a motor connected to an impeller is located in a space on the back side created by the protrusion.