JP2816667B2 - Static eliminator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharger for discharging or applying an AC or DC high voltage, and for discharging or charging an object (including a gas) by ions generated by the discharge, in particular, an electrode. The present invention relates to a static eliminator capable of reporting a discharge failure, abnormal discharge, and the like.

[0002]

2. Description of the Related Art The applicant of the present invention has provided various protection circuits for protecting a power supply circuit and the like when a discharger is abnormally discharged. For example, Japanese Patent Publication No. Hei 7-28499 filed by the applicant of the present application discloses that in a static eliminator using a high-frequency high-voltage power supply of a self-excited oscillation type, when a static elimination electrode leaks and oscillation stops, a high-voltage transformer for the power supply is used. And a protection circuit for protecting transistors and the like.

[0003]

However, since such a protection circuit is intended to protect a specific circuit component when an abnormality actually occurs, the electrodes are defective in discharge. It cannot be confirmed that the battery is in an abnormal discharge state or a state in which abnormal discharge can occur.

An object of the present invention is to make it possible to easily detect that an electrode is in a defective discharge state, is in an abnormal discharge state, or is in a state where abnormal discharge can occur. It is an object of the present invention to provide a static eliminator in which confirmation can be easily performed on the electrode side.

[0005]

According to the present invention, a light-emitting display element is mounted on an electrically insulating electrode holder holding a discharge electrode and a ground electrode, and the light-emitting display element is connected to a current limiting resistor. The light-emitting display element is turned on by using a discharge current flowing through the ground electrode while protecting the light-emitting display element with the resistor.

Further, by connecting a light emitting element of a photocoupler to the light emitting display element and connecting an alarm to the light receiving element of the photocoupler, the alarm is electrically insulated from the electrode side.
An alarm can be issued with protection from high voltage and discharge current. The photocoupler can be attached to the electrode holder together with the light emitting display element.

[0007]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 to FIG. 5 show a first example of an electrode structure of a charge removal device according to the present invention. This electrode structure has a resin-molded, long, electrically insulating electrode holder 1 as a main body and a central portion thereof, that is, the opposed long wall portions 2, 2 of the electrode holder 1.
In between, the long sawtooth-shaped electrode plate 3 is partially held and held as follows.

The electrode holder 1 has a base end 4 and a tip 5
The two long wall portions 2 and 2 are held in parallel to form a long hollow frame. The front and back surfaces between the two long wall portions 2 and 2 have long openings. On the other hand, the width of the rear opening 7 is slightly reduced. A plurality of ribs 8 are provided at predetermined intervals in the back side opening 7, and the electrode plate 3 is partially fitted into a narrow groove provided at the center of the rib 8, whereby both long wall portions are formed. The electrode plate 3 is partially sandwiched and fixed between the two. Rib 8
Is molded from the resin separately from the electrode holder 1,
The two may be detachably fitted to each other, or may be integrally formed with the electrode holder 1.

The electrode plate 3 is formed by press-cutting a thin and long metal plate into a saw-tooth shape, and has a large number of triangular discharge protrusions 9 projecting at regular intervals. The tip 9a of the discharge projection 9
Is directed toward the front opening 6 of the electrode holder 1, but stays inside without protruding from the front opening 6.

Two film-like grounding electrodes 10, 10 made of conductive silk printing are provided on the long sides of the front side of both long walls 2, 2 of the electrode holder 3, that is, on the long sides on both sides of the front opening 6. Is formed. These ground electrodes 10 can also be formed by attaching a conductive tape (copper foil adhesive tape).

One light emitting diode 11 is attached to the tip 5 of the electrode holder 3 as a light emitting display element. The light emitting diode 11 is connected to the ground electrodes 10 as described later, and is turned on when a predetermined or more discharge current flows through the ground electrodes 10.

The base end 4 of the electrode holder 3 is formed in a cylindrical shape. As shown in FIG. 5, a printed circuit board chip 12 and a resistor 13 are provided inside the hollow inside the resin 1.
4 is buried. Printed circuit board chip 12
Are metal foils 12b and 12b on both sides of the resin 12a itself.
Since b is printed, the capacitor 13 is connected to the capacitor having a large capacitance, that is, the electrode plate 3 as a coupling capacitance C, and the resistor 13 is connected in parallel with the coupling capacitance C in the resin 14. The power cable 15 drawn from the resin 14 is connected to this.

In such an electrode structure, when the power cable 15 is connected to the high-voltage power supply 16 and a high voltage is applied to the electrode plate 3 through the coupling capacitor C and the resistor 13 connected in parallel, the electrode plate 3 Discharge occurs between the tips 9a of the large number of discharge projections 9 and the ground electrodes 10. When the applied voltage is AC, the rise of the plus / minus voltage waveform can be adjusted by the coupling capacitor C and the resistor 13, so that the static elimination accuracy can be improved and the electric shock can be suppressed.

The electrode plate 3 itself is a thin and long metal plate, and is only partially held and fixed by the ribs 8 between the opposed long wall portions 2.
When the high voltage to be applied is an alternating current, a large number of the discharge projections 9 vibrate while discharging, so that adhesion of dirt can be prevented by itself. Since the ground electrodes 10 are in the form of a film, even if they become dirty, they can be easily wiped off.

Since both sides of the electrode holder 1 are open beyond the length of the electrode plate 3 and penetrate therethrough, the two long wall portions 2.
The ion current flows through the gap between the electrodes, thereby improving the static elimination efficiency or the charging efficiency. When a predetermined or more discharge current flows through the ground electrodes 10, the light emitting diode 11 is turned on, so that abnormal discharge can be notified.

Next, in the electrode structure of the second example shown in FIG. 6, a large number of discharge projections 9 are provided on both edges of the electrode plate 3, and this electrode plate 3
Between the two long wall portions 2 of the electrode holder 1 at the intermediate portion on the front and back, and in addition to the ground electrodes 10 on the long side of the front side opening 6 of the electrode holder 1, the long side of the back side opening 6 Ground electrodes 10 and 10 made of conductive printing or copper foil adhesive tape are also provided on the edges. With such a structure, a single electrode plate 3 can simultaneously generate a discharge on both the front and back surfaces of the electrode holder 1.

It is also possible to form a multi-electrode structure by fixing a plurality of electrode plates in parallel with a certain interval between the two long wall portions 2 of the electrode holder 1.

Next, an electrical configuration for lighting the light emitting diode 11 and issuing an alarm will be described. FIG. 7 shows an outline of the electrical configuration. In addition to the power supply cable 15, a signal line 17 is also drawn from the electrode holder 1, and the power supply cable 15 is connected to a transformer 18 of a high-voltage power supply 16.
The signal line 17 is connected to an alarm device 20 having a power switch 19 for the high-voltage power supply 16.

FIG. 8 shows an equivalent circuit of the configuration on the electrode holder 1 side in FIG.
On the other hand, the light emitting element 21a of the photocoupler 21 built in the tip 5 of the electrode holder 1 and the current limiting resistor 2
2 and connected in series to the ground electrodes 10
On the other hand, it is grounded by a not-shown ground wire (electric wire) or the like. Light emitting diode 11 and light emitting element 21a
, A diode 23 whose rectifying direction is reversed is connected in parallel. Light receiving element 21b of photocoupler 21
Is connected to the alarm 20 via the signal line 17.

In the circuit configuration of FIG. 8, when a discharge occurs between the electrode plate 3 and the ground electrodes 10, a discharge current flows through the ground electrodes 10, and the discharge current is a current connected in series. The current flows to the ground via the limiting resistor 22, the light receiving element 21 b of the photocoupler 21, and the light emitting diode 11. When the current value exceeds a predetermined value, the light emitting diode 11 is turned on and the photocoupler 21 is turned on and an alarm is issued. The vessel 20 operates.

Therefore, the light emitting diode 11 during abnormal discharge
When the photocoupler 21 is set to be turned on, the occurrence of abnormal discharge can be confirmed at the tip of the electrode holder 1 by turning on the light emitting diode 11, and is also known by an alarm by the alarm 20. be able to. In addition, during normal discharge, the light emitting diode 11
Is turned on, when the discharge current decreases, the light amount of the light emitting diode 11 decreases. Therefore, it is determined that the discharge failure has occurred due to the contamination of the electrode plate 3 or the ground electrodes 10. It is possible to confirm by the change of the lighting state of the diode 11, and it is also possible to notify such a discharge failure by the alarm 20.

FIG. 9 shows an equivalent circuit in the case where the photocoupler 21 is provided on the alarm device 20 side. In this case, the light emitting diode 11 on the electrode holder 1 side and the light emitting element 21 a of the photocoupler 21 on the alarm device 20 side are connected via the signal line 17.

[0024]

As described above, according to the charge remover of the present invention, the light emitting display element is mounted on the electrode holder, and the light emitting display element is connected to the earth electrode via the current limiting resistor. Thus, the light emitting display element is turned on using the discharge current flowing through the ground electrode while protecting the light emitting display element, so that abnormal discharge or discharge failure due to electrode contamination can be confirmed on the electrode holder. Also,
Since it has a simple configuration in which a light emitting display element is connected to a ground electrode via a current limiting resistor, a special detection circuit is not required, and it can be provided at low cost.

Further, since the alarm can be electrically insulated from the electrode side, an alarm can be issued while being protected from high voltage and discharge current.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an electrode structure of a charge removal device according to the present invention.

FIG. 2 is a perspective view in which the direction is changed from FIG.

FIG. 3 is an enlarged cross-sectional view taken along a line AA in FIG.

FIG. 4 is a partial cross-sectional view taken along a center line.

FIG. 5 is a diagram showing a circuit configuration for applying a high voltage to an electrode plate.

6A and 6B are schematic configuration diagrams of a second example of an electrode structure, in which FIG. 6A shows only an electrode plate, and FIG. 6B shows an electrode plate and an electrode holder holding the same.

FIG. 7 is a schematic diagram of an electrical configuration of the present invention.

8 is a diagram showing a configuration on the electrode holder side in FIG. 7 as an equivalent circuit.

FIG. 9 is a diagram showing an equivalent circuit when a photocoupler is provided on the alarm device side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode holder 2 Long wall part 3 Electrode plate 4 Base end part 5 Front end part 6 Front side opening 7 Back side opening 8 Rib 9 Discharge protrusion 9a Pointed end 10 Ground electrode 11 Light emitting diode (light emitting display element) 12 Metal foil chip 13 Resistor 14 Resin Reference Signs List 15 power cable 16 high-voltage power supply 17 signal line 18 transformer 19 power switch 20 alarm 21 photocoupler 21a / 21b light-emitting element and light-receiving element of photocoupler 22 current limiting resistor 23 diode

Claims (2)

(57) [Claims] 1. A light emitting display element is mounted on an electrically insulating electrode holder holding a discharge electrode and a ground electrode, and the light emitting display element is connected to the ground electrode via a current limiting resistor. A light-emitting device of a photocoupler is connected to a display device, and an alarm is connected to a light-receiving device of the photocoupler. 2. The static eliminator according to claim 1, wherein a photocoupler is attached to the electrode holder.