JPS59105861A - Spray apparatus - Google Patents

Abstract

PURPOSE:To enhance an insulating rate and to obtain large charging effect, by using an impact pulverization system as the atomization means of a spray apparatus to separate a liquid supply system and an atomization part. CONSTITUTION:The liquid supplied from a tank 12 is supplied to a nozzle 14 while pressurized by a pump 13 and injected from the fine orifice of said nozzle as a columnar jet stream which is, in turn, collided with a barrier body 15 provided to the downstream side of the nozzle 14 to be pulverized into fine particles. In this case, high voltage is applied to the barrier body 15 by a high voltage generation apparatus 16 and the liquid is scattered as charged fine particles. By this simple constitution, extremely large charging effect is obtained without taking a cumbersome insulating means.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a spray device used in electrostatic coating devices, chemical spray devices, liquid fuel combustion devices, and the like.

Conventional configuration and its problems When spraying or painting chemicals, it is desirable that all of the chemicals and paint adhere to the object, and it is desirable that the chemicals and paint adhere to the target object, and that it also spreads not only to the area projected from the jet nozzle but also to the back side. It is desirable to write a book. To avoid this, it has been conventional practice to charge the spray to utilize static electricity to improve the adhesion height.

Induction charging and corona charging are often used as methods for charging liquid particles. FIG. 1 shows a conventional spray device using corona charging. This is done by ejecting liquid pressurized by pump 1 from nozzle 2 to form a spray.
It passes through the charging electrode 3 and is charged. A high voltage generator 4 is connected to the charged electrode 3, and corona discharge is generated. The advantage of this method is that the pump 1, nozzle 2, and tank 5 can be kept at ground potential, and there is no need to take insulation measures. However, with this method, it is difficult to uniformly charge all the particles, and the effect of wrapping around the target 6 is not sufficient. This is because corona charging does not allow ions to penetrate sufficiently into the cone-shaped spray group.

FIG. 2 shows a conventional spray device using induction charging. The liquid supplied from the tank 7 is caused to flow around the outer periphery of a rotating cup 9 that is rotated at high speed by a motor 8, and is atomized by centrifugal force. A high voltage is applied to the rotary cup 9 by a high voltage generator 1o, and the liquid becomes charged particles and scatters. In this method, it is possible to charge the liquid particles uniformly, the effect of wrapping around the target 6 is large, and the adhesion is also good. However, in this system, high voltage is also applied to the tank 7 and the rotary cup drive system, so it becomes necessary to use means such as the insulating shaft 11.

Purpose of the Invention The present invention has been made in order to improve the above-mentioned drawbacks of the spraying device using static electricity. The present invention provides a spray device that does not require removal.

Structure of the Invention In the present invention, by using an impact atomization method as the atomization means, the liquid supply system and the atomization section are separated, and a high voltage can be applied only to the atomization section. It is capable of charging liquid particles, has an extremely good charging effect, and can obtain a high adhesion rate.

Description of examples Next, one embodiment of the present invention will be described based on the drawings.

FIG. 3 shows an embodiment of the present invention, in which a tank 12
The liquid supplied from the nozzle 1 is pressurized by the pump 13.
A cylindrical jet stream is ejected from the pores of Nozzle 14.
The particles collide with an impactor 16 provided downstream of the particle and are atomized. A high voltage is applied to the collision body 15 by a high voltage generator 16, and the liquid becomes charged particles and scatters.

The state of atomization at this time is not shown in FIG. The jet stream 16 ejected from the pores of the nozzle 14 is initially a smooth stream, but begins to vibrate uncontrollably, and eventually breaks off at the nodes of vibration and splits into droplets. These droplets collide with the collision body 15, and the collided droplets form a crown,
It is atomized from its tip. In this way, in the second embodiment, the droplets are atomized by continuously colliding with the colliding body 15, so that the voltage applied to the atomizer is not applied to the liquid supply system, and the insulation means Even if you do not take , it is possible to keep everything other than the atomization part at ground potential. Moreover, in the second embodiment, since the liquid particles can be charged by the induction charging method, the charging effect is extremely strong, and it is possible to provide a spraying device that has a very good coverage rate on the target. In addition, when the present invention is used in a spray-type liquid fuel combustion device, for example, it is possible to prevent the spray from coalescing with each other, and to make the duct or flame port through which the spray is conveyed the same potential as the colliding body. This has the effect of preventing spray from adhering and improving conveyance efficiency.

Note that the pores of the nozzle 14 used in this example have a diameter of 100 mm.
μ, length 500 μ, and a cylindrical end face with a diameter of 5 mm is used as the collision body 15. The distance between the nozzle 14 and the impacting body 16 is
It is necessary to set the collision body 16 so that it is located in the droplet flow part of the jet, and this depends on the viscosity of the liquid used, the pore diameter of the nozzle, the roughness of the wall inside the nozzle pore, and the pressure at which the liquid is jetted. Therefore, you can make a decision based on these factors.

Effects of the Invention As is clear from the above explanation, the present invention has an extremely simple structure using a nozzle and an impactor, eliminates the need for troublesome insulation measures, and can provide an extremely large charging effect. When used in electrostatic coating equipment, chemical spraying equipment, etc., it is possible to achieve a very good penetration effect and adhesion rate to the target, and when used in liquid fuel combustion equipment, etc. By simply setting the spray transport path to the same potential as the colliding object, spray adhesion can be prevented, completely preventing wetting of the duct and flame opening,
The spray transport efficiency can be improved. As described above, the present invention provides a spraying device having a simple structure and many advantages, and its industrial scope is very high.

[Brief explanation of the drawing]

1 and 2 FIG. 1 is a block diagram of a conventional spraying device, FIG. 3 is a block diagram of an embodiment of the present invention, and FIG. 4 is an enlarged sectional view of a main part of an embodiment of the present invention. 13...Pump, 14...Nozzle, 15
... Collider, 16... High voltage generator.

Claims (1)

[Claims] A spraying device in which a collision body is provided to collide the jet stream with a droplet flow portion of the jet stream ejected from a pore, and a voltage is applied to the collision body.