JPS5895557A - Spraying device - Google Patents

Abstract

PURPOSE:To prevent a liquid from drooping on a collision body and to reduce particle size greatly by blowing particulates atomized by allowing a jet flow liquid to collide with a body of rotation. CONSTITUTION:A liquid jetted from the small hole of a nozzle 14 collides with a collision body 11 of rotation. Consequently, while the collision point is kept clean invariably, a liquid having a scatter or particulates suppressed never swells, and the liquid is atomized easily. Further, the residual liquid sticking to the collision part is atomized by centrifugal force during one turn. Atomized particulates are blown by a blower 13 installed at the upstream side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an impact spray device, which is a type of liquid spray device, and is aimed at significantly improving the atomization characteristics.

In general, impingement spray devices have the following drawbacks. (2) After the collision, the liquid jet does not become completely TM, but two parts adhere to the collision body and hang down below the collision body.

■The atomization rate is poor and there are few particles with small diameters.

In order to eliminate these drawbacks, conventional methods have been to increase the speed of the jet flow,
In addition, attempts have been made to increase the speed of the air flow around the jet or to reduce the diameter of the nozzle pores, but these measures not only do not fundamentally solve the problem, but also unnecessarily increase the size of the device. In addition, as negative means, methods have been used in which only fine particles are selected by collecting dripping liquid or using appropriate upper particle separation means, but these methods do not actively improve the atomization characteristics.

FIGS. 1a and 1b show a conventional impingement spraying device, in which 1 is a nozzle having a pore 2, and 3 is an impingement body provided downstream of this nozzle 1. FIG. A pressure pump 4 is installed upstream of the nozzle 1.
and a liquid tank 6 are provided. Furthermore, the blower 6 supplies conveying air to the vicinity of the impactor 3 and carries out the fine particles from the spray tank 7.

A return pipe 8 recirculates dripping and untransported top grains upstream of the pressure pump 4.

In this configuration, the mechanism of generating spray will be explained.

The jet stream ejected from the pores 2 at high speed is split into various patterns in the collision body 3 and becomes atomized. The typical patterns are as follows. As shown in FIG. 2, the jet stream is ejected from the pore 2 as a smooth stream and then passes through an oscillating stream to become a dripping stream. When these jets collide, wave-like vibrations are induced on the collision surface, and the crests of these waves split into fine particles.

Further, the waves spread concentrically and flow down along the collision body 3, forming a droop. The fragmented particles include both large and small particles, depending on the wave shape and vibration speed. Such a conventional simple impingement spray system has the above-mentioned drawbacks.

The present invention focuses on the fact that the behavior of the wave portion differs depending on the amount of liquid remaining on the collision surface, and significantly improves the atomization characteristics by reducing the amount of liquid remaining on the collision surface. .

That is, the fact that a large amount of liquid remains on the collision surface means that the speed at which the liquid after collision spreads toward the outer circumference is slow. Theoretically, the momentum of the jet is conserved after the collision and spreads to the outer periphery, but in reality, the velocity is significantly reduced due to frictional resistance with the collision surface.Since the jet flow rate is constant, the diffusion rate to the outer periphery is If the amount decreases, a high bulge is formed on the outer periphery as shown in FIG. On the other hand, the collision point of the jet moving at high speed is still near the surface of the impacting body 30, and is therefore located in the valley of a high swell.

At this time, the air flowing along with the jet toward the collision surface (the air surrounding the jet always receives the momentum of the jet and flows in the same direction) flows to transport the particles split from the wave edge toward the outer circumference. The fragmented particles are inhibited by the swell induced by the stagnation of the liquid mentioned above, and cannot be dispersed in their entirety.

The present invention will be described in detail below along with examples.

FIG. 3 shows an embodiment of the present invention. In FIG. 3, the collision body 3 has a rotating shaft 9 and is driven by an electric FFI 10. In FIG. The jet that collides with the axis of the rotating colliding body 11 exhibits almost the same pattern of behavior as in the conventional example, but the liquid after the collision is subjected to centrifugal force in addition to the kinetic energy of the jet, so the diffusion rate cannot be reduced. do not have. Furthermore, since the centrifugal force increases in proportion to the radius, it is possible to reduce the bulge/hour at a portion farther from the collision point. Note that 12 is a return pipe which has the same function as 8 in FIG. As a result, the split fine particles are naturally scattered without any obstruction and are taken out from the opening 16 of the spray tank 16. Furthermore, the part that is not atomized, that is, the conventional liquid, is atomized from the outer periphery of the collision body by centrifugal force according to the principle of rotational atomization.

In a simple rotary atomization method, the particle size is generally large, but the particle size varies greatly depending on the amount of liquid to be rotary atomized. When a part of the total liquid is atomized by collision in advance and the rest is atomized by rotation as in this method, the particle size of the rotary spray is also smaller than that of the conventional simple rotary atomization method.

When it is necessary to convey the generated spray from the generation part to another part, the above-mentioned electric motor 1o rotates the colliding body 3 and the blower 13.
If they are installed coaxially, one electric motor can perform two functions.

FIG. 4 is a diagram showing details of the collision of the jets shown in FIG. 3, in which the nozzle 14 is provided opposite to the rotating direction of the rotating collision body 11. The jet collides with the rotating side surface of the rotating impactor 11 .

In such a configuration, the point of impact is constantly moving on the rotating impactor - a fresh impact surface is provided to the jet. That is, the liquid accumulated in the vicinity of the collision point is removed by centrifugal force during one revolution. For this reason, the above-mentioned liquid bulge does not occur near the collision point, and fine particles can be dispersed well. Further, the liquid removed by centrifugal force is atomized by rotation from the outer periphery of the rotating body. Furthermore, in this case, since the direction of the jet flow and the direction of rotation are opposed to each other, the collision energy of the jet flow is doubled, further improving the atomization characteristics.

That is, in such an impact spraying method, the relative velocity between the jet and the impactor is converted into energy for splitting the jet, so that the atomization characteristics are improved.

In the present invention, since a rotating body is used as the collision plate as shown in FIG. 2-F, dripping of liquid on the collision body can be prevented.

In addition, it is possible to obtain a large amount of fine particles with a small particle size, and the vaporization rate is increased by increasing the specific surface area of the liquid particles. It can be used in cavity inhalers, food powder drying devices, various sprays, etc. When used in a liquid fuel combustion device, the vaporization and combustion speed can be increased by reducing the particle size of the liquid. It also generates a large amount of water particles when used in humidifiers, making it useful for preventing indoor dryness.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional collision spray device, FIG. 2 is a model diagram of the atomization mechanism in FIG. 1, FIG. 3 is a block diagram of a spray device according to an embodiment of the present invention, and FIG. FIG. 3 is a perspective view of the main part of FIG. 3; 9...Rotating shaft, 1o...Motor, 11...
... Colliding body, 12 ... Return pipe,
13...Blower, 14...Nozzle. Figure 2 Figure 3/2' Figure 4

Claims (3)

[Claims] (1) A spray device in which the liquid jetted from the pores collides with a rotating body, a part of the jet liquid is atomized by collision in the first stage, and the remainder is atomized by rotation from around the rotary body in the second stage . (2) A blower is provided at one end of the drive section of the rotating body,
3. The spraying device according to claim 1, further comprising a collision body provided downstream of the blower, and a path for transporting the liquid particles by the wind pressure of the blower. (3) The spray device according to claim 1, wherein the jet liquid collides with the front Bd rotating body in a direction opposite to the rotational direction.