JPS5836659A - Electric field curtain device - Google Patents

Abstract

PURPOSE:To make best use of the capacity of an electric curtain device in said device by regulating inter-electrode distances and controlling the frequencies of applied voltage according to the number of phases of the electrode patterns. CONSTITUTION:Electrode patterns 2, 3, 4 of single phase, 3 phase, 4 phases are buried in an insulating member layer 5, and a dielectric layer 6 is provided, whereby a dielectric sheet 1 is formed. The frequency Hz of the voltage to be applied to said electrode patterns is controlled in a 30<=Hz<=50 range according to the number of phases 2, 3, 4 of the electrode patterns. Here, the distances l between the respective electrodes are set at 1-3mm.. Said range of the applied voltage is determined from empirical values. The max. transport capacity of electric charge particles is brought out by the control of the applied voltage and the regulation of the inter-electrode distances, whereby the device is operated efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric field curtain device, and more particularly to the relationship between the number of phases of an electrode pattern, the frequency of an applied alternating electric field, and the distance between electrodes.

Electric field curtain equipment f/IL#i An electrode pattern is arranged on an insulating layer and coated with a dielectric layer, and an alternating electric field is applied to the electrode pattern.The number of phases of the electrode pattern, the frequency of the applied voltage, and the distance between the electrodes are The reality is that it is not clear how the relationship with people affects their abilities.

The present invention was made in view of the above circumstances, and its purpose is to clarify the relationship between the number of phases of an electrode pattern, the frequency of applied voltage, and the distance between electrodes, and to maximize the ability of the electric field curtain device by using these relationships. It is an object of the present invention to provide an electric field curtain device designed to draw out the electric field to the maximum extent possible.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic explanatory diagram of electric field curtain loading, in which linear electrodes are arranged in parallel inside a dielectric sheet (1), and a three-phase electrode pattern (2.3.4) of υ phase, V phase, and W phase is used. is formed, and an AC high voltage (alternating electric field) is applied to each electrode pattern 2.3° 4, and the charged particles 5 are levitated by i-electric repulsion due to the action of the unequal alternating electric field generated near the surface of the dielectric sheet 10. The structure is such that it is transported in a direction perpendicular to the electrode without contact.

ζ Here, the transport force (power to transport particles 5) of the electric field curtain device is determined by the following factors (parameters).

■Strong electric field on the surface of the dielectric sheet.

■Mass, specific gravity, amount of charge, n electric current of particle 5.

■Air resistance coefficient of particle 5.

■Frequency of applied voltage.

■Number of phases of electrode pattern.

■Distance between electrodes.

Therefore, the inventor of the present invention discovered a method as a result of various experiments using the electric field curtain device shown in FIG.

In FIG. 2, reference numeral 5 denotes an insulating member layer and a 6Fi dielectric layer, which constitute the dielectric sheet 1. In FIG.

Figure 3 shows the time (T) required for a half cycle (period in which the polarity of two electrodes is reversed) of the unequal alternating electric field generated between adjacent electrodes regardless of the number of phases (in the case of multiphase, the FIG. 4 is a table showing the relationship between the phase difference (matching the phase difference) and the conveyance capacity.

However, the inter-electrode pitch pFizs■C the inter-electrode distance t#'
izo■, electrode width α5■), applied voltage 3KV (IL
The position showing the maximum conveying force of M8) is designated as loom.

From the table in Figure 3, the phase difference T of the applied voltage (in the case of single phase, #i - 1/2. f is the frequency of the applied voltage) is approximately 125 ■ The maximum conveying force is obtained for cod. .

That is, 40 Hz s for single phase and 27 H2 for 3 phase
% In 4-phase, 20 Hz is the frequency of the optimum applied voltage. Figure 4 is a table showing the applied voltage waveform and phase difference in case of 4-phase, where T is the phase difference and soil is the frequency T.

Next, the relationship between the effective voltage V between adjacent electrodes and the distance t between the electrodes is set to V/z When we experimented with the phase difference showing this, we obtained the results shown in Figure 5.

Therefore, the frequency Hys on the phase number side indicating the maximum carrying capacity
, the relationship between the electrode distance t is the maximum conveyance capacity = 75ir H2...
・It becomes (1).

In equation (1), te wax is IZ5XIOsee, t = 2
If m, the frequency in the case of single phase is 40H2, in the case of three phases, it is 301 m, and in the case of four phases, it is 20Hz.

On the other hand, the input to the electric field curtain device basically requires only voltage and almost no current.

However, the space between the electrodes inevitably has a capacitor-like effect, and almost all of the input current is a capacitive current (Capacitive current).
tlveCurrenT).

In addition, interelectrode insulating materials (polymer substances such as silicone rubber)
This capacitive current accelerates deterioration, and if the capacitive current is large, dielectric breakdown will eventually occur.

Capacitance current 1 tj: l-4CV=2tfCV=af, where C is capacitor capacitance and a-2πCV (constant).

From this, the frequency of the applied voltage is preferably as small as possible.

Furthermore, the higher the frequency of the high-voltage transformer included in the power source of the applied voltage, the more efficiently the transformer can be made smaller and lower in cost.

Considering the above things comprehensively, the distance t between the electrodes is 1~3■
It was found that it is optimal to apply a voltage of 30 to 50 Hz in the electric field curtain device.

1+, and the inter-electrode distance @t#'it~3■ is appropriate.

If Fit is less than 1, it is necessary to reduce V in order to keep v7t constant, but if there is a defect between the electrodes (bubbles, impurities), dielectric breakdown is likely to occur, and the electrode On the other hand, if t is set to 3 or more, V must be increased to keep V/l constant, which increases the cost of the transformer for the applied power. I don't like it.

Furthermore, an electric field curtain with five or more phases is not preferred in practice because it is expensive including the power supply and cannot provide a proportional effect.

Note that the waveform of the voltage applied to the electric field curtain device may be any of a sine wave, a rectangular wave, and a triangular wave.

As described above, the present invention can maximize the ability of the electric field curtain device and operate efficiently.

[Brief explanation of drawings]

Figure 1 is a schematic explanatory diagram of the electric field curtain device, Figure 2 is a sectional view of the 3-phase electric curtain device, Figure 3 is a table showing the relationship between conveyance capacity and phase difference, and Figure 4 is for the case of 4-phase. Phase diagram of
FIG. 5 is a table showing the relationship between the distance between the electrodes and the phase difference. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto

Claims (1)

[Claims] In an electric field curtain device in which single-phase, three-phase, and four-phase electrode patterns with a distance between adjacent electrodes of 1 to 3 cm are embedded in the electric sheet, the frequency His of the voltage applied to the electrode patterns is set to 30 ≦Hsw (An electric field curtain device characterized by controlling according to the number of phases of an electrode pattern in the range of 50.