JPH0685360B2 - Static electricity removal method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of removing static electricity used to prevent electrostatic damage.

[Prior Art] Conventionally, as this type of static electricity removing method and apparatus,
For example, there are first and second conventional examples shown below.

In the first conventional example, corona ions having a polarity opposite to the static electricity of the charged body are generated and applied to the charged body,
The static electricity of the charged body is electrically neutralized so that it can be removed.

Specifically, [A] a positive DC high voltage is applied to generate only positive corona ions (see FIG. 4), [B]
A negative DC high voltage is applied to generate only negative corona ions (see FIG. 5), [C] A positive DC high frequency high voltage is applied to intermittently generate only positive corona ions (See FIG. 6), [D] A device in which a negative DC high frequency high voltage is applied to intermittently generate only negative corona ions (see FIG. 7) is known.

In the second conventional example, positive and negative corona ions are periodically and alternately generated and applied to the charged body,
The electrostatic charge of the charged body can be electrically neutralized and removed regardless of the mixture of polarities.

Specifically, [E] an AC low frequency high voltage is applied to intermittently generate positive and negative corona ions (see FIG. 8), and [F] an AC high frequency high voltage is applied. It is known to intermittently generate positive and negative corona ions (see FIG. 9).

[Problems to be Solved by the Invention] However, in the direct current type of the first conventional example, when the polarities of the charged bodies are mixed, uneven charge removal occurs, and when a high direct current voltage is applied for a long time. Has a problem that the charged body is charged to the opposite polarity.

In addition, in the AC method of the second conventional example, since positive and negative corona ions are generated intermittently, the amount of ions is insufficient,
In addition to the reduction of the static elimination effect, static elimination unevenness occurs for the charged body moving at high speed. Further, since positive and negative corona ions are generated by the same corona discharge needle, corona ions tend to be electrically neutralized near the corona discharge needle. Furthermore, if the frequency of the AC high voltage is increased as shown in FIG. 9, the positive and negative corona ions interfere with each other, and the effect of static elimination is lost. On the contrary, as shown in FIG. 8, the lower the frequency is, the more uneven the static elimination occurs, and the static elimination effect cannot be expected.

Therefore, the present invention has been made by paying attention to the above-mentioned problems, and an object thereof is to increase the effective charge removal distance, facilitate the adjustment of ion balance, and enable charge removal at a low voltage to be economical. Another object of the present invention is to provide a static electricity eliminator capable of improving safety.

[Means for Solving the Problems] A method of removing static electricity according to the present invention, which achieves the above object, comprises:
Input 100V / 50-60Hz commercial power to the converter which is a full wave rectifier without interposing a transformer.
Continuously generate positive and negative DC output of 5 Kv, guide this to the positive and negative corona discharge electrodes that are independently arranged with a fixed interval, and apply the positive output to the positive corona discharge electrode. Generate a positive corona ion, and apply a negative output to the negative corona discharge electrode to generate a negative corona ion continuously, and adjust the voltage of the positive and negative DC output respectively. This is performed while adjusting the balance of the ions generated from the corona discharge electrode.

[Operation] When removing the static electricity of the charged body, the converter outputs positive and negative DC high voltage separately, and the output positive DC high voltage is applied to the positive corona discharge electrode to reduce the negative DC high voltage. When applied to the negative corona discharge electrode, the raw corona discharge electrode produces positive corona ions and the negative corona discharge electrode produces negative corona ions. When the positive and negative corona ions reach the charged body in an ion-balanced state, the static electricity of the charged body is neutralized with the positive or negative corona ions and removed regardless of the mixture of polarities.

Since the positive and negative corona discharge electrodes are independent in this way, it is possible to eliminate static electricity at a low voltage, improve economic efficiency and safety, facilitate ion balance adjustment, and increase the effective static elimination distance. To do. Therefore, the problem can be eliminated.

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

FIG. 1 is a circuit diagram showing the static electricity removing device, FIG. 2 is a waveform diagram showing the output voltage of the converter, and FIG. 3 is a perspective view showing the main part of the device.

This static eliminator has a converter 2. This converter 2 is designed to convert and output positive and negative DC high voltage by using AC voltage of commercial frequency 50-60Hz as input voltage. It has built-in mounting parts such as choke coil, semiconductor, and capacitor, and outputs The positive and negative DC high voltage generated through the lead wires 9 and 10 to the corona discharge needles 5 and 6
Can be applied to. The corona discharge needles 5, 6 are positively and negatively independently supported by the insulator 8, and are arranged in parallel along the groove portion at equal pitches. The roots of the positive and negative corona discharge needles 5 and 6 implanted in the insulator 8 come into contact with the positive and negative lead wires 9 and 10 embedded along the groove so that electrical conduction can be obtained. Has become. In addition, 7 is earth.

Next, the operation of the static eliminator having the above structure will be described.

When removing the static electricity of the charged body, if an AC voltage with a commercial frequency of 50 to 60 Hz is input to the converter 2, the converter 2 outputs a positive and negative DC high voltage of 2 to 5 KV as shown in FIG. , And to the positive and negative corona discharge needles 5 and 6 via lead wires 9 and 10. The positive corona discharge needle 5 generates positive corona ions when a positive DC high voltage is applied, and the negative corona discharge needle 6 generates negative corona ions when a negative DC high voltage is applied. When the generated positive and negative corona ions reach the charged body in the state of ion balance, the static electricity of the charged body is electrically neutralized with the positive or negative corona ions and removed regardless of the mixture of polarities.

In this way, since the positive and negative corona discharge needles 5 and 6 are independently provided, the positive and negative corona ions do not interfere with each other, and the device has the positive and negative corona discharge needles 5 and 6. Because of the structure that utilizes the potential difference between 6, the static electricity can be effectively removed at a relatively low DC high voltage of 2 to 5 KV. The positive and negative ion balance can be easily adjusted only by adjusting the positive and negative DC high voltages applied to the positive and negative corona discharge needles 5 and 6. As a result, the effective charge removal distance is increased, and the positive and negative corona ions can reach the charged body at least three times as far as the AC type.

The present invention is not limited to the above embodiment.
For example, in this embodiment, the case where the corona discharge needle is used as the corona discharge electrode has been described, but the present invention is not limited to this, and the corona discharge wire may be stretched as the corona discharge electrode. In addition, the ground is not always necessary, and the insulator need not be attached.

[Effects of the Invention] According to the present invention, a positive corona discharge electrode that generates positive corona ions by applying a positive DC high voltage and a negative corona ion that generates negative corona ions by applying a negative DC high voltage. Since the corona discharge electrode is provided separately, positive and negative corona ions do not interfere with each other, and a converter that performs full-wave rectification is used. Since a continuous positive and negative voltage without interruption can be applied to the discharge electrode, it is possible to effectively eliminate static electricity at a low voltage as a DC high voltage,
The economical efficiency and safety can be improved. Furthermore, by adjusting the positive and negative DC high voltage, the positive and negative ion balance can be easily adjusted, and further, the effective static elimination distance can be significantly increased as compared with the AC type, and the static elimination performance can be improved. The effect is obtained. Further, according to the method of the present invention, since a transformer for boosting, which is an indispensable part in the conventional AC type corona discharge type static eliminator using a commercial power source, is not required, the volume corresponding to that is not required. -The capacity can be reduced, which is useful not only for reducing the size and weight of the device, but also for the manufacturing cost, thereby solving the above-mentioned problems.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a static electricity removing device, FIG. 2 is a waveform diagram showing an output voltage of a converter, FIG. 3 is a perspective view showing a main part of the device, and FIGS. 4 to 9 are conventional corona generating devices. 3 is an output waveform diagram of FIG. 2: Converter 5, 6: Corona discharge needle 9, 10: Lead wire

Claims (1)

[Claims] 1. A 100 V / 50-60 Hz commercial power source is input to a converter which is a full-wave rectifier without interposing a transformer to continuously generate positive and negative DC outputs of 2-5 Kv. Is led to positive and negative corona discharge electrodes independently arranged with a certain interval, and a positive output is applied to the positive corona discharge electrode to generate positive corona ions, and
A negative output is applied to the negative corona discharge electrode to continuously generate negative corona ions, and the positive and negative DC output voltages are adjusted to balance the ions generated from each corona discharge electrode. A method of removing static electricity, which is performed while adjusting.