JPH08162284A - Static eliminator - Google Patents

Abstract

PURPOSE: To provide a widely usable and economical static eliminator by projecting ionized gas produced by radiating X-rays to air flowing in an ionization chamber to the surface of an object for static electricity elimination. CONSTITUTION: Air introduced in an ionization chamber 20 through a leading-in pipe 22 from a fan 21 is ionized by X-rays generated by an X-ray tube of an X-ray generating apparatus. Air molecules which absorb X-rays become ionized gas. X-ray shielding plates 23, e.g. lead plates, etc., are installed in the surrounding of the X-ray tube 11 and an ionization chamber 20. After passing a guide pipe 24, air containing ionized gas generated in the chamber 20 is led to near an object 30 for static electricity elimination by the fan 21 and projected to the surface of the object 30 for static elimination through a nozzle 25 and the charge on the surface of the object 30 for static elimination is neutralized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static eliminator,
More particularly, it relates to a device for removing static electricity from a charged object by projecting ionized air onto the charged object.

[0002]

BACKGROUND OF THE INVENTION While the use of static electricity is increasing in various fields such as copying, painting, flocking, and other fields, various obstacles due to static electricity are occurring in various manufacturing industries and the like. In order to avoid the adverse effects of static electricity, there are two alternatives: to prevent electricity or eliminate electricity. In the former, there are methods such as grounding the equipment, making it electrically conductive, and using a surface-active agent to prevent the surface of the object to be charged from being charged with static electricity, and in the latter, using a discharger using corona discharge. There is a method such as doing. However, it is impossible to make all the charge-removed objects conductive because of the use and function of the charge-removed objects. The point is that it is impossible to completely prevent the generation of static electricity. Therefore, various types of static eliminators are conceivable. However, if the conventional static eliminator using corona discharge is used, dust is generated from the discharge needles and there is a limitation in use in a clean room.

As is clear from the above, the present invention can be deployed in various devices or during the manufacturing process of the body to be neutralized without restriction, and the device is relatively simple and can be provided at low cost. The purpose is to clarify the removal device.

[0004]

The static eliminator according to the present invention is provided with an ionization chamber in a part of a conduit for air introduced by a fan, and the ionization chamber includes a high-voltage power supply device and an X-ray tube. The X-ray generator is connected and arranged, and the X
The air flowing through the ionization chamber is irradiated with X-rays generated from the X-ray tube to convert the air into an ionized gas, and the air containing the ionized gas is projected onto the surface of the object to be neutralized. Alternatively, a filter and / or a membrane device for separating nitrogen gas from an air component is arranged in the subsequent stage, and air containing an ionized gas is projected onto the static-eliminating object through a nozzle designed to correspond to the outer shape of the static-eliminating object. , Respectively.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described in more detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 is an X-ray generator, which comprises an X-ray tube 11 consisting of a cathode, an anticathode, and an anode, and a high-voltage power supply unit 12 for applying a high voltage to each electrode. .

An ionization chamber 20 is an X-ray generator 10
X-rays generated by the X-ray tube 11 (for example, 7 KV / 0.
6 mA = 4.2 W or 10 KV / 1 mA = 10 w) is supplied, and the air introduced through the introduction pipe 22 is ionized by the fan 21. When the irradiated X-rays come into contact with air molecules, they are absorbed by the air molecules,
Air molecules that have absorbed X-rays become ionized gas. The amount of ionized gas generated is determined by the flow rate of air, the frequency distribution of emitted X-rays, and the amount or intensity of X-rays.

Since X-ray exposure adversely affects the human body, an X-ray shield plate 23 such as a lead plate (for example, 1 mm thick) is arranged around the X-ray tube 11 and the ionization chamber 20. The lead plate may be arranged inside the ionization chamber 20. The ionization chamber 20 is preferably composed of a metal pipe such as stainless steel.

The air containing the ionized gas generated in the ionization chamber 20 is guided by the fan 21 to the vicinity of the object 30 to be neutralized through the guide tube 24, and passes through the nozzle 25 to the surface of the object 30 to be neutralized. Is projected. At this time, the ionized gas comes into contact with the surface of the body 30 to be neutralized, so that the electric charge accumulated on the surface of the body 30 to be neutralized is neutralized.

The surface of the object to be neutralized 30 is charged positively or negatively, but since the ionized gas and the separated electrons are projected, both of them have an effect of neutralizing.

The static eliminator according to the present invention includes the following embodiments.

As the fan 21, various types such as a push-in type and a retractable type can be adopted.

As the ionization chamber 20, a part of the tube which is an air flow path may be used as it is as in the embodiment shown in FIG. 1, but an independent housing may be prepared. In this case, it is preferable that the air is introduced from the upper side surface of the housing and the air containing the ionized gas is discharged from the lower side surface.

In a further preferred aspect of the present invention, the fan 2
A membrane device for separating the nitrogen gas from the filter and the air component and supplying the separated nitrogen gas to the ionization chamber 20 is arranged at the front stage or the rear stage of 1. A mode in which only a filter is arranged may be used.
An oxygen / nitrogen separation membrane can be used as the membrane used in the membrane device.

Further, in the embodiment shown in FIG. 1, the air containing the ionized gas is supplied to the body 30 to be discharged through the guide tube 24 and the nozzle 25.
In the mode of arranging in the vicinity of 0, the guide tube 24 and the nozzle 2
5 is unnecessary, and the air containing the ionized gas is directly projected from the ionization chamber 20 onto the object to be neutralized.

The nozzle 25 is variously designed in accordance with the outer shape of the body 30 to be discharged and the condition such as whether the body 30 to be discharged is stationary or being transferred. Further, depending on the type of the object 30 to be discharged, a housing to be a charge removing chamber is prepared without using the nozzle 25, and the object 30 to be discharged is placed in the housing and ionized gas is introduced. It may be a mode.

Ionization chamber 20, guide tube 24, nozzle 25
In order to prevent the electrostatic particles in the air from adsorbing to at least the inner wall surface, it is preferable to carry out a surface treatment such as an electrically neutralized state or applying a fluororesin. This configuration is effective in preventing particles adsorbed on the wall surface from being peeled off and carried to contaminate the body 30 to be discharged.

It is expected that the static electricity removing apparatus according to the present invention may adversely affect the human body by utilizing X-rays. However, the quantity and intensity of X-rays generated may be adjusted, or By arranging the shield plate by the lead plate,
Such concerns can be resolved. For further safety, it is possible to adopt a mode in which the entire periphery including the ionization chamber 20 is covered with a shielding plate.

[0019]

According to the static eliminating device of the present invention,
X-rays can be generated simply by connecting a power supply device to a commercially available X-ray tube, and ionized gas is obtained by irradiating the X-rays with air, and the air containing this ionized gas is projected onto an object to be discharged. Since it is possible to neutralize the electric charge charged on the surface of the static-eliminating object by simply doing so, there is versatility that it can be used without restriction for static-elimination of the static-eliminating object having various outer shapes. Not only can it be provided at a low price, but since it uses air, it is effective in reducing running costs, and the above-mentioned problems can be solved. In particular, according to the present invention, unlike a high-voltage application type static eliminator, dust is not generated by the discharge needles, and thus it is optimal for removing static electricity in a clean room.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

[Explanation of symbols]

 10-X-ray generator 11-X-ray tube 12-Power supply device 20-Ionization chamber 21-Fan 22-Introduction pipe 23-Shield plate 24-Guide pipe 25-Nozzle

Claims (3)

[Claims] 1. An ionization chamber is provided in a part of a conduit for air introduced by a fan, and a high-voltage power supply device and an X-ray generation device including an X-ray tube are connected to the ionization chamber and arranged. It is characterized in that the air flowing through the ionization chamber is irradiated with X-rays generated from a ray tube to convert the air into an ionized gas, and the air containing the ionized gas is projected onto the surface of the object to be neutralized. Static eliminator. 2. A filter and / or a front stage or a rear stage of the fan.
Alternatively, the static electricity removing device according to claim 1, further comprising a membrane device for separating nitrogen gas from air components. 3. The static electricity eliminator according to claim 1, wherein the air containing the ionized gas is projected onto the static eliminator through a nozzle having a design corresponding to the outer shape of the static eliminator.