JPS59127666A - Sprayer for electrostatic charged granular body - Google Patents

Abstract

PURPOSE:To obtain stable quantity of electricity applied to a granular body, by providing a DC high-voltage generator and a pulse-voltage generator at a high- voltage generator, and impressing both of the voltages in a superimposed state onto a part to be charged with electricity. CONSTITUTION:In the titled sprayer, a high-voltage generator has a DC high- voltage generator for generating DC high voltage V and a pulse-voltage generator for generating pulse voltage. Hence, voltage formed by superimposing the DC high voltage and the pulse voltage with each other is impressed onto a part to be charged with electricity, so that corona discharge is formed inside the part to be charged with electricity by said impressed voltage. Thus, a high charging speed can be obtained regardless of the ejection amount of a granular body, and the stable quantity of electricity applied to the granular body can be also obtained.

Description

[Detailed description of the invention] This invention relates to a one-piece electrostatic sprayer that sprays onto objects to be sprayed.

In order to improve the effect of pharmaceuticals adhering to crops, electrostatic pesticide sprayers such as the one shown in Figure 1 have conventionally been used. whistle 1
As shown in the figure, the granule supply device 1O stores agricultural chemicals in the form of liquid or powder, and this granule is sprayed onto the object to be sprayed (not shown) via the charged part 12. The iIT passing through the charging section 12 is dispersed in the form of particles. And charging part l2
A high voltage generator l4 is used to charge the particles passing through the
is installed, and in conventional spreaders, a high voltage generator l is installed.
A DC high voltage generator is used as 4, and the DC high voltage is applied to the charging part 12 via the insulator 16. Therefore, corona discharge occurs in the charged part l2 due to the DC high voltage,
The particles in the charging section 12 are charged by ions generated by the corona discharge.

The particles are sprayed as charged particles 18 onto the object to be sprayed.

In this way, in the conventional electrostatic pesticide sprayer.

By applying a DC high voltage to the band's viewing part 2, the grains passing through the charging part 12 are charged, and the sapling is made using the Coulomb force between the charged grains]8 and the digit (b). Since it is configured to perform adhesion, it is possible to improve the effect of pesticide adhesion to one crop.

However, with conventional sprayers, the amount of pesticides attached to crops is greatly influenced by the amount of granules supplied, that is, the amount of spray.
There was a drawback that a sufficient pesticide adhesion effect could not be obtained depending on the amount of blowout. In other words, the blowout rate of a spreader is usually 6 to 18 CKy/min, but some spreaders have a blowout rate of 100 [K9/min], and if the blowout rate changes in this way, The corona discharge in the charging section 12 will change. FIG. 2 shows the relationship between the DC applied voltage (■) and the discharge current (■) to the charging part 92, and as the blowout amount W increases as Wl-÷w2→w3, the influence of space charge becomes stronger. I'll take this down. Generally, the DC applied voltage V to the charging section 12 is set close to the linear voltage V5. and.

The theoretical charge amount Q of the particles is expressed by the following equation.

However, τ=4εoE/I.

Here, is a constant (3 in the case of a conductor), E is the electric field strength,
a is the particle radius, t is the charging time, τ is the charging constant, and I is the discharge current.

In the above formula, 1(-E-d2) is the final charge amount.

It is determined by the electric field strength E. − means that the charging speed is 10τ and depends on the discharge current ■. Therefore, when the discharge current (2) and the spark voltage Vs decrease due to an increase in the blowout amount W, the charge amount Q significantly decreases according to the above equation, as shown in FIG. As a result.

The disadvantage is that the amount of pesticides attached to crops is reduced, and sufficient insect repellent effects cannot be exerted.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide an electrostatic particle dispersion machine that can obtain a fast charging speed and a stable particle charge amount regardless of the amount of one particle blowout. It is about providing.

In order to achieve the above object, the present invention provides a high voltage generator with a DC high voltage generator and a ξ pulse voltage generator to generate a DC high voltage and a pulsed voltage. A stable particle charge amount is obtained by applying a voltage and a pulsed voltage in a superimposed manner.

Preferred embodiments of the present invention will be described below based on the drawings.

In the electrostatic granule spreader of the present invention, the same members as those in the conventional spreader shown in FIG.

The high voltage generator used in the spreader of this example is the fourth
It has a DC high voltage generator (not shown) that generates a DC high voltage (2) as shown in the figure, and a pulse voltage generator (not shown) that generates a pulse voltage. The pulse period of the pulsed voltage generated from the pulsed voltage generator can range from several 1'O [m, r] to several [μ9].

A voltage obtained by superimposing a DC high voltage and a pulsed voltage as shown in FIG. 5 is applied to the charging section 12, and a corona discharge is generated within the charging section 12 due to the applied voltage.

Fig. 6 shows the relationship between the voltage (average voltage) applied to the charging section 12 and the discharge current I. The dotted line shows the case when only a DC voltage is applied, and the case when a pulsed voltage is superimposed on this. is shown as a solid line. As is clear from FIG. 6, if the applied voltage is kept constant, the discharge current (2) becomes larger when a .xi.-shaped voltage is superimposed on the DC voltage and applied to the charging section 12. or.

Figure 7 shows the applied voltage (average voltage) ■ and the discharge current ■ when the application amount W ('Wl < W2 < W3) is varied using a voltage obtained by superimposing a pulsed voltage on a DC voltage.
The relationship between As is clear from comparing Figures 2 and 7, if the applied voltage ■ is constant, a higher discharge current ■ can be obtained when using a voltage that is a superimposition of a DC voltage and a pulsed voltage. .

Furthermore, the spark voltage Vs does not drop extremely. Therefore, according to the sprayer of this embodiment, a stable charge amount Q can be obtained even when the spray amount -V changes, and as a result, the effect of attaching pesticides to crops can be sufficiently exhibited. I can do it. Furthermore, it has been confirmed through experiments that the sprayer of this embodiment can achieve a faster charging speed than conventional sprayers.

Incidentally, although the above-mentioned embodiment is an explanation of an electrostatic pesticide sprayer, it is also possible to use it for electrostatic coating, and a high coating speed can be obtained.

As explained above, according to the present invention, by applying a DC high voltage and a pulsed voltage in a superimposed manner to the charging section,
Fast charging speed regardless of the amount of granules ejected: sputum can be obtained and a stable granule charging surface can be obtained, 1+
1] By using it as a static area pesticide sprayer, it is possible to fully demonstrate the effect of applying a small amount of pesticide to one crop.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing an electrostatic pesticide sprayer, which is an example of a conventional electrostatic granular sprayer, and Figure 2 is the relationship between applied voltage and discharge current when the blowout amount is changed in a conventional scattering plate. FIG. 3 is an explanatory diagram showing the relationship between the blowout amount and the amount of charge in a conventional spreading machine, FIG. 4 is an explanatory diagram showing the waveform of applied voltage in a conventional spreading machine, FIG. 5 is an explanatory diagram showing the waveform of applied voltage in the spreader of the present invention,
FIG. 6 is an explanatory diagram showing the relationship between applied voltage and discharge current in the electrostatic granule spreader according to the present invention, and FIG. 7 is a diagram showing the case where the amount of dust/ITJ is changed in the electrostatic granule spreader according to the present invention. FIG. 2 is an explanatory diagram showing the relationship between applied voltage and discharge current. 10. Particle supply device 12. Charging unit] 4. High voltage generator ] 8. Charged granule.・Fig. 1 Fig. 2 ErV Voltage ■ - O 11 I Book O Missing 1 W - Fig. 4 ++ ν 81 Questions Fig. 5

Claims (1)

[Claims] (1) A static electricity source that includes a granule supply device that disperses granules onto a target object via a charging section, and a high voltage generator that applies a high voltage to the charging section to charge the granules in the charging section. In the electric granule spreader, the high voltage generator includes a DC high voltage generator that generates a DC high voltage and a pulse voltage generator that generates a pulse voltage. An electrostatic particle scattering machine characterized in that a direct current high voltage and a pulsed voltage are applied in a superimposed manner to the charging section.