JPH02129900A - Charge removal apparatus - Google Patents

Abstract

PURPOSE:To make the structure of the title apparatus small and remove charge certainly without being influenced by the charged amount of the charged body. CONSTITUTION:A plurality by conductive fibers 2 in order are fixed in a conductive body 3 in their one ends and the conductive body 3 is covered with an insulator to give an electrode part 1 of a charge removal apparatus. When high voltage of alternating current is applied to the electrode part 1 by a alternating current high voltage generating means 4, electric discharge in low current is generated between the charged body and the fibers and the charge of the charged body is certainly removed regardless of the charged amount. Since the electric flow rate of the high voltage is small, the size of the charge removal apparatus is made small.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a static eliminator that removes static electricity from a charged body using air ions generated by corona discharge.

(Prior Art) Conventionally, as a static eliminator for removing static electricity from a charged body, a voltage application type static eliminator or a self-discharge type static eliminator is known.

The voltage application type static eliminator includes, for example, as shown in FIG. 6, an electrode section a and an AC high voltage generator. In the electrode part a, a large number of needle-shaped discharge electrodes C are disposed in the longitudinal direction of a rod-shaped insulator d, and a ground electrode e facing the discharge electrodes C with a gap is provided at both ends of the insulator d. It is supported through an insulating material.

By applying an AC voltage from the AC high voltage generator to the discharge electrode C via the conductor f, a corona discharge is generated between the discharge electrode C and the ground electrode e. This corona discharge ionizes the air, and these air ions neutralize and eliminate the charge on the charged body X. At this time, since the voltage applied to the discharge electrode C is alternating current, positive air ions and negative air ions are generated. That is, if the charged body X is negatively charged, it will be neutralized by positive air ions, and conversely, if the charged body X is positively charged, it will be neutralized by negative air ions. .

In order to generate the air ions necessary to reliably eliminate static electricity from the charged body be. In other words, as shown in FIG. 7, for a charged body with an initial charging potential Ei of 1 okV, if the voltage V applied to the discharge electrode is 3.8 kV or less, no corona discharge will occur and static elimination will not occur at all. And the voltage v is 4kV
When this happens, static electricity is removed, and if the voltage V is set to 5 kV, the static electricity is removed to approximately 1 kV or less. As is clear from this, in order to completely eliminate static electricity, the voltage (2) applied to the discharge electrode needs to be 6 kV or more.

Therefore, the AC high voltage generator is a device equipped with a medium-sized transformer, which is relatively large, and there are disadvantages such as restrictions on installation locations.

The self-discharge type static eliminator is, for example, as shown in FIG.
A plurality of conductive fibers are held as discharge electrodes on a conductor g such as aluminum, and are grounded via a conductor j extending from the conductor g.

This self-discharge type static eliminator uses the electrostatic energy of the charged body X to generate air ions.The electric field from the charged body Ionizes the air and generates air ions.

Therefore, the effect of static elimination by the self-discharge type static eliminator depends on the magnitude of the charging voltage of the charged body X. Specifically, when the charging voltage of the charged body X is positive and the charging voltage is 2.5 kV or less, and when the charging voltage is negative and the charging voltage is 3.0 v or less, no corona discharge occurs. Therefore, depending on the charging voltage of the charged body X, there is a problem in that static elimination is not performed at all.

(Problems to be Solved by the Invention) By solving the above-mentioned disadvantages, the present invention can reliably eliminate static electricity regardless of the amount of charge on a charged body.
An object of the present invention is to provide a static eliminator that can be miniaturized.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an electrode section formed by arranging a plurality of conductive fibers at intervals on a conductor and fixing one end of the conductive fibers; and AC high voltage generating means for applying voltage to the sex fibers.

Moreover, the electroconductive fiber is exposed and the electrode part is covered with an insulating material.

Further, it is characterized in that the electrode portion and the AC high voltage generating means are integrally provided in series.

(Function) The apparatus of the present invention having the above means is brought close to a charged body, and a voltage is applied to the conductive fibers by the AC high voltage generating means. At this time, corona discharge occurs between the charged body and the conductive fibers even if the applied voltage is relatively small. Therefore, it is possible to eliminate static electricity from a charged body with a relatively small voltage.

Further, by covering the other parts with an insulating material except for the conductive fibers, the possibility of contact with the high voltage electrode part is eliminated.

In addition, since the applied voltage is relatively small as described above, the AC high voltage generating means can be small-scale, which makes it possible to downsize the device.Furthermore, the entire device can be configured in one piece. It becomes possible.

(Example) An example of implementation of the present invention will be described based on the drawings.

As shown in the first figure, the electrode part 1 is made by bundling a plurality of conductive fibers 2 in small quantities, and placing one end of each bundle at intervals inside a conductor 3 made of an aluminum plate formed into a cross-sectional shape. It is formed by being fixed in a sandwiched state. The conductive fiber 2 is connected via a conductor 3 to a conducting wire 5 extending from a small AC high voltage generating means 4. The AC high voltage generating means 4 includes:
This is a transformer that transforms the voltage from the power supply line 6, and the transformed voltage is applied to the conductive fiber 2 via the conductor 5 and the conductor 3. Further, the AC high voltage generating means 4 is grounded by a grounding wire 7.

The static eliminator having the above configuration removes static electricity from the charged body X. The diagram shown in FIG. 2 represents the relationship between the initial charging potential Ei of the charged body X at this time and the residual potential Er after the charged body X is neutralized. As shown here, when the voltage 8 applied to the conductive fiber 2 is OkV and grounded, that is, as a self-discharge static eliminator, there is no charge at all in the range of the initial charging voltage Ei of -3 to +2.5 kV. Static electricity is not removed. Therefore, when the applied voltage VB is increased, even if the absolute value of the initial charging voltage Ei is small, static electricity is removed and the residual potential becomes low (as the applied voltage VB increases). The electric potential decreases and the static elimination effect improves.Then, when the applied voltage (8) of the defrosting device of this embodiment is 3 kV, the static elimination effect becomes considerably high, and the applied voltage VI1 of the conventional voltage application type static elimination device is 6 kV. Compared to this, the applied voltage is half as high as 8.

Therefore, the AC high voltage generating means 4 of this embodiment can generate a lower voltage than the AC high voltage generating device of the conventional voltage application type static eliminator, and is therefore smaller in size.

Further, in the static eliminator of the present invention shown in the above embodiments, as shown in FIGS. 3 and 4, the electrode part 1 is covered with an insulating material 8 and the conductive fibers 2 are exposed. It is preferable to do so. Thereby, there is no risk of directly touching the conductive fibers 2 and the conductor 3 to which voltage is applied, and there is no fear of electric shock.

In addition, as another embodiment, as shown in FIG. 5, an electrode part 9 having the same structure as the electrode part 1 covered with the insulating material 8 is provided with a small AC high voltage like the AC high voltage generating means 4. The generating means 10 may be formed in a continuous manner. This eliminates the trouble of separately installing the electrode section 1 and the AC high voltage generating means 4.

(Effect of the invention) As is clear from the above, the static eliminator of the present invention has the following features:
To reliably eliminate static electricity from a charged body with a low applied voltage, regardless of the amount of charge on the charged body.

Further, according to the present invention, there is no risk of contact with the electrode part due to the insulating material, so it can be used safely, and since it is possible to use a smaller AC high voltage generating means than before, there is a restriction on the installation location. It is possible to provide a static eliminator in which the amount of electricity is reduced, and in which the electrode part and the AC high voltage generating means are integrated, making it easy to install.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the initial charging potential of a charged body and the residual potential after static elimination in the static eliminator of this embodiment, and FIG. A side view showing the electrode section of a modified embodiment of the illustrated embodiment, FIG. 4 is IV of FIG. 3.
-IV line sectional view, FIG. 5 is a side view showing another embodiment, FIG. 6 is a side view showing a conventional voltage application type static eliminator, and FIG. 7 is an applied voltage and a charged object in the device shown in FIG. 6. FIG. 8 is a side view showing a conventional self-discharge type static eliminator. DESCRIPTION OF SYMBOLS 1... Electrode part, 2... Conductive fiber, 3... Electric conductor, 4... AC high voltage generation means, 8... Insulating material.

Claims (1)

[Scope of Claims] 1. An electrode portion formed by arranging a plurality of conductive fibers at intervals on a conductor and fixing one end thereof, and an AC high voltage for applying voltage to the conductive fibers. 2. A static eliminator 3 according to claim 1, characterized in that the electric conductive fiber is exposed and the electrode part is covered with an insulating material. The static eliminator according to claim 1, characterized in that the static eliminator is integrally connected with an AC high voltage generating means.