JPH08131982A - Ionizing and charge-eliminating apparatus equipped with dust sucking mechanism - Google Patents

Abstract

PURPOSE: To miniaturize a charge-eliminating apparatus equipped with a dust sucking mechanism and to efficiently perform the dust extraction of a minute area and the dust extraction in a container having a small opening part and to extend a maintenance period. CONSTITUTION: A charge-eliminating apparatus is equipped with a discharge electrode 2, an earth electrode 3, an air jet mechanism and a dust sucking mechanism, and ions produced by the corona discharge caused between the discharge electrode 2 and the earth electrode 3 are sprayed on an object 28 by the air ejected from the air jet mechanism to eliminate the charge of the object 28 and the dust removed from the object 28 is sucked and removed by the dust sucking mechanism. The discharge electrode 2 is constituted by a hollow electric good conductor and the earth electrode 3 is constituted of the hollow electric good conductor arranged around the discharge electrode 2 and the jet air passage 18 of the air jet mechanism having an air jet orifice 19 made in the leading end part thereof is formed in the discharge electrode 2 and the suction passage 24 of the dust sucking mechanism having a suction port 25 made in the leading end part thereof is formed between the discharge electrode 2 and the earth electrode 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ionization static eliminator having a dust suction mechanism.

This static eliminator is used for static elimination, dust removal, and dust absorption of minute parts such as parts in a cleaning process such as a manufacturing process of a small switch or a plastic parts manufacturing process. It is also used to remove electricity, remove dust, and absorb dust inside medicines, food containers, etc. with small openings such as eye drop containers.

[0003]

2. Description of the Related Art Dust, etc. in the plastic manufacturing industry, which manufactures liquids such as eye drop containers, powder containers, etc., and in the chemical and food industries, or in the light electric power industry, which manufactures small switches using plastics, etc. The requirement for foreign matter removal is extremely high. Therefore, it is not uncommon to provide a number of cleaning steps in the manufacturing line.

Conventionally, washing with water has often been performed as a method for removing foreign substances, but this method has problems such as the need for subsequent steps such as drying, management of water for washing and waste liquid treatment. In addition, there are many problems such as an expensive production process, and other effective means have been earnestly desired.

Freon cleaning is also a cleaning method that has been widely used, but due to environmental and cost problems, this method is being reviewed and switched to other methods rapidly.

In recent years, instead of washing with water or chlorofluorocarbon, an air washing process has been frequently used. However, with this method, in the case of an easily charged object such as plastic, it is difficult to remove the attached dust due to static electricity, and the dust can be removed by adjusting the air pressure and the air nozzle tip shape. Also, in the case where the electrostatic charge remains, dust easily reattaches after the cleaning process. Therefore, in air cleaning, a static elimination air nozzle incorporating a static electricity removing device (static elimination device) has come to occupy an important position in the process.

As this type of static eliminator, for example, as disclosed in Japanese Utility Model Publication No. 59-38382, a discharge electrode, a ground electrode, a gas ejection mechanism and a dust suction mechanism are provided.
Ions generated by the corona discharge between the discharge electrode and the ground electrode are blown onto the object to be neutralized by the gas ejected from the gas ejection mechanism, to neutralize the object to be neutralized, and the dust removed from the object to be neutralized by the neutralization. It is known that the dust is sucked and removed by a dust suction mechanism.

Generally, a high voltage is applied to the discharge electrode of the static eliminator, and a ground electrode is arranged around it. It is necessary to maintain a constant gap between the discharge electrode and the ground electrode due to the relationship of withstand voltage. If the gap between the discharge electrode and the ground electrode is too small, the corona discharge that is originally performed shifts to spark discharge, causing extreme wear of the electrode, generation of discharge noise, etc., and the original charge removal cannot be performed. If this gap is not sufficient, creeping discharge will occur due to the aging of the insulating resin, and the product life of the static eliminator will be extremely shortened. For this reason, the shape and size of the static elimination electrode (the discharge electrode and the ground electrode) itself have certain restrictions.

In the static eliminator using the jetted gas as described above, a hollow ground electrode is arranged around the discharge electrode, and the gap between the discharge electrode and the ground electrode is made small in order to reduce the gap between these electrodes. Highly insulating material may be added. When the insulating material is not inserted, the gap between the discharge electrode and the ground electrode is used as the ejection gas passage. When the insulating material is inserted, the gap between the insulating material and the ground electrode is used as the ejection gas passage, and the gas is supplied to the ejection gas passage. The generated gas is ejected from the tip.

In addition, when performing static elimination and dust removal, it is naturally necessary to absorb the removed dust. Conventionally, a dust absorbing hood was separately manufactured, and a dust absorbing mechanism was connected to this to absorb dust. .

[0011]

In the conventional static eliminator described above, the gas is ejected through the ejection gas passage between the discharge electrode and the ground electrode, so that the cross-sectional area of the ejection gas flow in the ejection direction becomes large. However, it was difficult to efficiently remove dust from a minute area. Further, from the relationship of the insulation distance between the discharge electrode and the ground electrode, it is difficult to reduce the cross-sectional shape of the gas ejection port at the tip of the ejection gas passage,
It was not suitable for cleaning a container with a small opening such as an eye drop container.

Further, since it is necessary to separately provide a dust suction mechanism, the size of the apparatus itself becomes large, and the apparatus becomes complicated and expensive, which is a major obstacle to adopting the air cleaning process using the static eliminator. .

Further, since a high voltage is applied to the discharge electrode of the static eliminator, the surrounding dust is attracted and adheres to and accumulates on the discharge electrode, and the dust weakens the electric field at the tip of the discharge electrode. The performance of the static eliminator deteriorates. In order to recover this performance deterioration, it is essential to regularly clean the discharge electrode as a regular maintenance of the static eliminator. On the other hand, there is a demand for a static eliminator that does not require maintenance because of the human cost of maintenance work and the workability of cleaning depending on the installation position.

An object of the present invention is to provide a static eliminator capable of efficiently removing dust in a small area and in a container having a small opening.

Another object of the present invention is to provide a device in which a static eliminator is miniaturized and a device having a function of static eliminator, dust remover, and dust absorber is integrated in a compact manner. To contribute to.

Still another object of the present invention is to reduce the adhesion of dust to the discharge electrodes, to minimize the deterioration of the static elimination effect and hence the deterioration of the dust removal effect over time, and to prolong the maintenance period of the static elimination device significantly.

[0017]

A static eliminator according to the present invention comprises a discharge electrode, a ground electrode, a gas ejection mechanism, and a dust suction mechanism, and the ions generated by corona discharge between the discharge electrode and the ground electrode are ejected by the gas ejection mechanism. It is sprayed on the object to be neutralized by the gas ejected from the
In an ionization static eliminator designed to remove dust removed from a static elimination object by static elimination by a dust suction mechanism, the discharge electrode is composed of a hollow electric good conductor, and the ground electrode is arranged around the discharge electrode. It is composed of a hollow electric good conductor, and a discharge gas passage of a gas discharge mechanism having a gas discharge port at the tip is formed inside the discharge electrode, and has a suction port at the tip between the discharge electrode and the ground electrode. The suction passage of the dust suction mechanism is formed.

As the gas jetted from the gas jetting mechanism, for example, dry air, nitrogen or the like is used.

For example, the outer surface of the discharge electrode is covered with an insulating coating layer made of an electric insulator.

For example, the thickness of the discharge electrode is thin.

For example, a sharp portion is formed at the tip of the discharge electrode.

For example, the insulating coating layer is projected in the gas ejection direction within a range of 2 mm or less from the tip of the discharge electrode.

For example, a dust suction hood for covering the object to be neutralized is connected to the tip of the ground electrode.

For example, the dust hood also serves as the ground electrode.

For example, a main body made of an electrical insulator is provided,
A discharge electrode fixing mechanism that fixes the discharge electrode, a ground electrode fixing mechanism that fixes the ground electrode, and a high-voltage cable for supplying a high voltage from a high-voltage power supply are fixed to the main unit to electrically connect the high-voltage cable to the discharge electrode. Connect the cable fixing mechanism, the air supply tube of the gas ejection mechanism to fix the air supply tube to the ejection gas passage inside the discharge electrode, and the dust suction tube of the dust suction mechanism. There is provided a dust suction tube fixing mechanism for communicating the dust suction tube with the suction passage between the discharge electrode and the ground electrode.

For example, the outer surface of the discharge electrode is covered with an insulating coating layer made of an electric insulator, the discharge electrode and the ground electrode are made of stainless steel, and the insulating coating layer of the main body portion and the discharge electrode are made of fluororesin. Is.

[0027]

Since the ejection gas passage of the gas ejection mechanism having the gas ejection port at the tip is formed inside the hollow discharge electrode, the cross-sectional area of the ejection gas flow in the blowing direction can be made extremely small. It is possible. And by forming the discharge electrode as thin as possible within the limits of processing,
The cross-sectional area of the discharge electrode, that is, the cross-sectional area of the jet gas passage can be made extremely small, and the cross-sectional area of the jet gas flow can be made extremely small. For this reason, ionized gas is concentrated in a small area to efficiently remove static electricity, dust, and dust in that area, or to send ionized gas into a container with a small opening to efficiently remove static electricity, dust, and dirt inside it. I can go well. Therefore, for example, in the cleaning process such as in the manufacturing process of small switches and the like, or in the plastic parts manufacturing process, it is possible to remove static electricity, dust, etc.
The dust absorption process can be simplified and replaced with a cleaning process such as water washing or chlorofluorocarbon cleaning. In addition, it is possible to eliminate static electricity inside medicine / food containers with small openings such as eye drop containers.
By using a static eliminator in the dust removing / dust collecting process, it is possible to construct an inexpensive production line and improve work efficiency and productivity.

Since the suction passage of the dust suction mechanism having the suction port at the tip is formed between the discharge electrode and the hollow ground electrode around the discharge electrode, it is not necessary to separately provide the suction passage, and the dust suction mechanism can be used. Simplification and downsizing can be achieved, and the entire static eliminator can be downsized.

Further, since the ejected gas always passes through the inside of the discharge electrode, it is possible to prevent dust from adhering to the inner surface of the discharge electrode. Moreover, if the outer surface of the discharge electrode is covered with an insulating coating layer made of an electric insulator, good insulation between the discharge electrode and the ground electrode can be achieved, and dust on the outer surface of the discharge electrode can be prevented. Adhesion can be prevented. Therefore, the charge removal performance can be kept good for a long time, the maintenance of the discharge electrode can be simplified, and the maintenance period can be significantly extended.

When the thickness of the discharge electrode is thin or a sharp portion is formed at the tip of the discharge electrode, a sufficient charge eliminating effect can be obtained.

The insulating coating layer is 2 mm from the tip of the discharge electrode.
In the following range, the electrode and the worker can be protected when the gas is projected in the gas ejection direction.

When a dust-collecting hood is connected to the tip of the ground electrode, the dust-collecting hood can cover the object to be neutralized, and the dust removed from the object can be efficiently sucked and removed. Also, the dust suction hood can also function as the ground electrode.

A body part made of an electrical insulator is provided, and the body part is
Discharge electrode fixing mechanism that fixes the discharge electrode, ground electrode fixing mechanism that fixes the ground electrode, cable fixing that fixes the high voltage cable for supplying high voltage from the high voltage power supply and electrically connects the high voltage cable to the discharge electrode Mechanism, a gas supply tube fixing mechanism that fixes the gas supply tube of the gas ejection mechanism and connects the air supply tube to the ejection gas passage inside the discharge electrode, and a dust collection tube that fixes the dust collection tube of the dust collection mechanism When the dust suction tube fixing mechanism that connects the discharge electrode and the ground electrode to the suction passage is provided, the static eliminator can be compactly integrated.

When the casing constituting the discharge electrode and the ground electrode is made of stainless steel, and the main body and the insulating coating layer of the discharge electrode are made of fluororesin, for example, the apparatus is dipped in a container containing alcohol and the whole is immersed. Can be easily washed.

[0035]

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

FIG. 1 shows an example of the configuration of the main part of the static eliminator, and FIGS. 2 and 3 show a part of it in detail in an enlarged manner. In the following description, up, down, left and right refer to FIG.

As shown in FIG. 1, the static eliminator comprises a main body section.
(1), and discharge electrode (2) attached to it, ground electrode (3), high-voltage cable (4), air tube for air supply
(5) and dust collection air tube (6).

The main body (1) is formed in a block shape with an electric insulator. In this example, a highly insulating fluororesin was used for the main body (1). A horizontal hole (7) penetrating the main body (1) in the left-right direction is formed in a portion below the center of the main body in the vertical direction. Threaded portions (7a) and (7b) are formed at the left end of the left side portion and the right end of the right side portion of the hole (7), respectively. The central portion of the hole (7) in the left-right direction has a smaller diameter than the left and right portions, and the screw portion (7c) is also formed in this portion. Make a hole in the bottom of the body (1) from its bottom surface.
A vertical screw hole (8) reaching the left side of the screw part (7b) on the right side of (7) is formed. A recess (9) is formed in the center of the upper surface of the main body (1), and a hole is formed from the bottom of this recess (9).
A vertical stepped hole (10) is formed that reaches the central screw part (7c) of (7). A horizontal screw hole (11) is formed in the upper left part of the main body (1) from the left end face to just to the left of the recess (9) .The screw hole (11) and the recess (9) are screw holes. It is connected by a horizontal hole (12) with a smaller diameter than (11).

The discharge electrode (2) is made of, for example, a metal that is a good electric conductor in a hollow shape, and is arranged so as to extend horizontally in the left-right direction. In this example, an electrolytically polished stainless steel pipe having an outer diameter of about 2.1 mm and an inner diameter of about 1.7 mm was used as the discharge electrode (2). Discharge electrode
The base end (left end) of (2) is fixed to the main body (1) via a hexagon socket set screw (13) made of stainless steel.
As shown in detail in Fig. 2, a through hole is formed in the center of the set screw (13).
(14) is formed, and a screw hole (15) reaching the hole (14) from the upper surface is formed on the upper peripheral wall thereof. Set screw (13) hole (14)
The left end of the discharge electrode (2) is inserted in and fixed in an airtight manner by welding. Discharge electrode protruding from set screw (13)
The outer surface of (2) is covered with an insulating coating layer (16) made of an electrical insulator. The outer diameter of the insulating coating layer (16) is slightly smaller than that of the set screw (13). In this example, the insulating coating layer (16)
Was formed by press-fitting the discharge electrode (2) inside a highly insulating fluororesin tube having an outer diameter of about 4 mm and an inner diameter of about 2 mm. As shown in detail in FIG. 3, the insulating coating layer (16) is
Within 2 mm or less from the tip (right end) of the discharge electrode (2),
It projects to the right. In this embodiment, the protrusion is about 0.8 mm. The set screw (13) is screwed into the central screw part (7c) of the hole (7) of the main body (1) and fixed, so that the left end of the discharge electrode (2) is fixed to the main body (1). ing. The discharge electrode (2) extends horizontally and long from the right end surface of the main body (1) to the right through the right side of the hole (7). Discharge electrode
There is a considerably large gap between the outer surface of the insulating coating layer (16) of (2) and the inner surface of the right side portion of the hole (7). In addition, the set screw (13) has a screw hole (15) at the top and has a stepped hole.
It is fixed so that it matches the lower end of (10). Then, the lower end of the stainless steel high-pressure joint pin (17) inserted into the stepped hole (10) of the main body (1) from above is screwed into the screw hole (15) of the set screw (13), This fixes the set screw (13). The set screw (13) and the joint pin (17) constitute a discharge electrode fixing mechanism that fixes the discharge electrode (2) to the main body (1). The inside of the discharge electrode (2) serves as a jetting gas passage (18) of a gas jetting mechanism which will be described later, and its tip (right end) serves as a gas jetting port (19).

On the right side screw part (7b) of the hole (7) of the main body part (1),
A stainless steel pipe connector (20) is screwed in and secured. At the center of the connector (20) is the discharge electrode
The through hole (2) whose inner diameter is larger than the outer diameter of the insulation coating layer (16) of (2)
1) is formed, and the middle part of the length of the discharge electrode (2) and the insulating coating layer (16) is radially spaced to form a hole in the connector (20).
It is inserted in (21). A hollow ground electrode (3) is concentrically arranged around the discharge electrode (2) protruding to the right of the connector (20), the left end of which is the right end of the hole (21) of the connector (20). It is inserted and fixed in an airtight manner. Ground electrode
(3) is also formed in a hollow shape from a metal that is a good electric conductor, for example. In this example, a stainless steel pipe was used as the ground electrode (3). A screw (23) made of highly insulating fluororesin is screwed and fixed in the screw hole (22) formed in the peripheral wall at a position that divides the part of the ground electrode (3) near the tip into three equal parts in the circumferential direction. The space between them is maintained so that the discharge electrode (2) and the ground electrode (3) are concentric with each other and an annular space is formed between them. The connector (20) constitutes a ground electrode fixing mechanism for fixing the ground electrode (3) to the main body (1). The tip of the discharge electrode (2) projects slightly to the right of the tip of the ground electrode (3). An annular space between the discharge electrode (2) and the ground electrode (3) serves as a suction passage (24) of a dust suction mechanism described later, and its tip portion serves as a suction port (25).

A crimp terminal (27) fixed to the ground wire (26) is sandwiched between the right end surface of the main body (1) and the connector (20), and the ground electrode (3) is connected to the ground wire ( 26) through 100
Grounded with a ground resistance of Ω or less.

At the tip of the ground electrode (3), the object of static elimination (28)
A conical dust-collecting hood (29) for covering is detachably fixed. In this example, the hood (29)
Is made of stainless steel and has the function of a ground electrode.

The tube connector (30) is screwed and fixed in the screw hole (11) on the upper left part of the main body (1), and the tip (right end) of the high-voltage cable (4) is located near the center of the connector (30). The part of is inserted. Cable (4) is core wire (4a)
And a silicon rubber coating (4b) covering the same and a high withstand voltage structure. The right end of the cable (4) protruding to the right of the connector (30) was inserted into the recess (9) through the hole (12) in the main body (1) and screwed into the set screw (13). Make sure that the upper end of the joint pin (17) breaks through the sheath (4b) and reaches the core wire (4a).
It is stabbed in (4), which allows the cable core wire to be
Electrical connection between the (4a) and the set screw (13) is secured, and as a result, the core wire (4a) and the discharge electrode (2) are electrically connected. The recess (9) is filled with a highly insulating silicone resin (31) for fixing and sealing the cable (4), and the recess
The upper opening of (9) is closed by a cover (32) made of highly insulating fluororesin. The cable (4) is covered with a silicone rubber protective tube (33) to prevent damage, and the tip (right end) of this protective tube (33) is inserted inside the left end of the connector (30). Has been fixed. Although not shown, the other end of the cable (4) is connected to an AC high voltage power supply. The connector (30) and the joint pin (17) constitute a cable fixing mechanism for fixing the cable (4) to the main body (1) and electrically connecting the cable (4) to the discharge electrode (2).

The air supply air joint (34) is screwed and fixed to the left-hand thread (7a) of the hole (7) of the main body (1), and the air supply air tube is attached to the left end of the joint (34). The tip (right end) of (5) is inserted and fixed. Although not shown, the other end of the tube (5) is connected to a dry air supply source. The tube (5) is connected to the jet gas passage (18) of the discharge electrode (2) through the passage (35) in the joint (34) and the left side portion of the hole (7) of the main body (1). There is.
Then, by the left side of the joint (34) and the hole (7), the air supply tube (5) is fixed to the main body (1) and communicated with the ejection gas passage (18) inside the discharge electrode (2). An air supply tube fixing mechanism is configured. Also tube
(5), the joint (34), the left side part of the hole (7), and the ejection gas passage (18) and the gas ejection port (19) of the discharge electrode (2) constitute a part of the gas ejection mechanism. .

An L-shaped dust suction air joint (36) is screwed and fixed in the screw hole (8) at the bottom of the main body (1),
The tip (right end) of the dust suction air tube (6) is inserted and fixed to the left end of the lower part of the joint (36) extending to the left. Although not shown, the other end of the tube (6) is connected to a vacuum generator. The tube (6)
Bent passage (37) in joint (36), hole in body (1)
It is communicated with the suction passage (24) between the discharge electrode (2) and the ground electrode (3) through the right side portion of (7) and the hole (21) of the connector (20). Then, by the joint (36), the right part of the hole (7) and the hole (21) of the connector (20), the main body (1)
A dust suction tube fixing mechanism for fixing the dust suction tube (6) to the suction passage (24) is constituted.
Also, the tube (6), the joint (36), the right part of the hole (7), the insulation coating layer (16) of the discharge electrode (2) and the hole of the connector (20).
A part of the dust suction mechanism is constituted by the annular space between (21) and the suction passageway (24) and suction port (25) between the discharge electrode (2) and the ground electrode.

FIG. 1 shows a state in which static elimination, dust elimination, and dust absorption of the static elimination target (28) fixed to the flat mounting surface (38) are performed.

In this case, a hood is attached to the tip of the ground electrode (3).
(29) is attached, and the opening of the tip of the hood (29) is the mounting surface.
The static elimination target (28) is covered by being brought into close contact with (38). In such a state, the high voltage output from the AC high voltage power supply passes through the core wire (4a) of the cable (4) and is applied to the discharge electrode (2) through the joint pin (17). Therefore, the discharge electrode
A large potential difference is generated between (2) and the ground electrode (3) and the hood (29), and a high electric field is applied through the insulating coating layer (16) of the discharge electrode (2), and the discharge electrode (2) Corona discharge occurs at the tip. On the other hand, the dry air supplied from the dry air supply source through the tube (5) is supplied to the passage (35) of the joint (34),
From the gas outlet (19) to the hood (2) through the left side of the hole (7) of the body (1) and the gas outlet passage (18) of the discharge electrode (2).
9) It is blown out inside. At that time, the dry air is electrically excited and ionized by the corona discharge generated at the tip of the discharge electrode (2), and is converted into positive and negative ions. Then, these ions are sprayed on the static elimination target (28) by the dry air blown out from the jet outlet (19), whereby the static elimination target (28) is neutralized and dust-removed,
The dust removed from the static elimination target (28) rises up. At this time, the suction passageway (24) between the insulating resin layer (16) of the discharge electrode (2) and the ground electrode (3) has a negative pressure due to the action of the vacuum generator connected through the tube (6). It has become. For this reason,
The air blown into the hood (29) and the dust that has risen up are sucked into the suction passageway (24) through the suction port (25), and the holes (21) of the connector (20) and the holes of the main body (1) are also drawn. Tube through right side of (7) and passageway (37) of joint (36)
(6) is sucked. As a result, the dust in the hood (29) is collected without being exposed to the outside, and the dust is absorbed.

FIG. 4 shows a state in which charge removal, dust removal, and dust absorption are performed inside a container having a small opening such as an eye drop container.

In this case, the hood (29) is not attached to the ground electrode (3), and the tip of the discharge electrode (2) has an opening (39a).
And is inserted into the container (static elimination target) (39), the tip of the ground electrode (3) is pressed against the peripheral edge of the opening (39a), and the opening (39a) is almost sealed. In this state, the high voltage applied to the discharge electrode (2)
Corona discharge occurs between (2) and the ground electrode (3), and the dry air blown out from the gas ejection port (19) and the ions generated by the corona discharge are blown to the inner surface of the container (39),
Static elimination and dust removal are performed. Then, similarly to the above, the dust removed from the inner surface of the container (39) is sucked into the suction passage (24) from the suction port (25) together with the dry air blown into the container (39), and the dust is absorbed. Done.

Dry air is supplied to the above-mentioned static eliminator through the air supply tube (5), the vacuum suction device is connected to the dust suction tube (6), and a waveform-controlled AC high voltage is supplied to the cable.
Applied via (4). In addition, a metal plate held by insulation is used as a pseudo-charged plate, and a 5,000-V DC high-voltage power source is used to convert it.
It was charged to V. Then, the ionized air blown out from the static eliminator was blown onto the pseudo-charged plate, and the static elimination of the charged plate was observed using a static electricity measuring device. As a result, it was confirmed that the use of the above static eliminator surely neutralized the pseudo charged plate.

Even when the hollow discharge electrode (2) as in the above embodiment is used, a high electric field can be applied depending on the thickness of the electrode (2) or the shape of the tip. It was confirmed that the positive and negative ions necessary for static elimination can be sufficiently generated by performing corona discharge that does not reach the level. That is, as shown in FIG. 3, even if the tip portion of the discharge electrode (2) is cut at a right angle, it is possible to enhance the static elimination effect by reducing the wall thickness. Further, as shown in FIG. 5, the tip of the discharge electrode (2) is obliquely cut to form one sharp portion (2a), or as shown in FIG. 6, the tip of the discharge electrode (2) is formed. The static elimination effect can also be enhanced by forming two sharp portions (2b) on the portion.
5 and 6, the same parts as those in FIG. 3 are designated by the same reference numerals.

The installation distance between the pseudo-charged plate and the gas ejection port (19) at the tip of the discharge electrode (2) of the above static eliminator is 50 m.
In the case of m or less, the time required to eliminate the charge from 5000 V to 500 V or less was 1 second or less, regardless of whether the charge polarity of the pseudo charging plate was positive or negative. Also, as the installation distance increases, the time required for static elimination increases,
The time required for static elimination was shortened as the supply air pressure increased. Furthermore, as shown in FIG. 5 or FIG.
By processing the tip of (1) into an appropriate shape, the static elimination time could be shortened slightly.

Further, when a sinusoidal AC high voltage which is not subjected to waveform control is applied, even if the charged object is treated by the above-mentioned static eliminator, due to residual charging or reverse charging, complete static neutralization up to around 0 V can be achieved. Not done

When the above static eliminator is used in the actual static erasing process, the function of the AC high voltage power supply, the voltage applied to the electrodes, the installation distance from the object, the pressure of the gas to be supplied, and the dust absorption The vacuum pressure and shape of the dust hood when required
It is necessary to carefully consider the dimensions.

[0055]

As described above, according to the static eliminator of the present invention, the cross-sectional area of the jetted gas flow with respect to the blowing direction can be made extremely small, and a small portion of the static eliminator or a container with a small opening can be provided. Static elimination, dust removal, and dust absorption can be efficiently performed with a simple and inexpensive device.

Further, since it is not necessary to separately provide a suction passage of the dust suction mechanism, the dust suction mechanism can be simplified and downsized, and the dust removing apparatus as a whole can be downsized. Therefore, the problem of installation on the actual line is significantly reduced, and the static eliminator can be arranged at a proper position to perform proper static elimination.

Further, since the ejected gas constantly passes through the inside of the discharge electrode, it is possible to prevent dust from adhering to the inner surface of the discharge electrode, and the outer surface of the discharge electrode is made of an electric insulator. By being covered with the insulating coating layer, it is possible to improve the insulation between the discharge electrode and the ground electrode,
Moreover, it is possible to prevent dust from adhering to the outer surface of the discharge electrode. Therefore, the charge removal performance can be kept good for a long time, the maintenance of the discharge electrode can be simplified, and the maintenance period can be significantly extended.

A sufficient discharge effect can be obtained by making the thickness of the discharge electrode thin or forming a sharp portion at the tip of the discharge electrode.

The insulating coating layer is 2 mm from the tip of the discharge electrode.
The electrode and the operator can be protected by being projected in the gas ejection direction within the following range.

Since the dust absorbing hood is connected to the tip of the ground electrode, the dust removing hood can cover the object to be neutralized, and the dust removed from the object to be neutralized can be efficiently sucked and removed. In addition, the dust hood can also function as a ground electrode.

A body part made of an electrical insulator is provided, and the body part is
Discharge electrode fixing mechanism that fixes the discharge electrode, ground electrode fixing mechanism that fixes the ground electrode, cable fixing that fixes the high voltage cable for supplying high voltage from the high voltage power supply and electrically connects the high voltage cable to the discharge electrode Mechanism, a gas supply tube fixing mechanism that fixes the gas supply tube of the gas ejection mechanism and connects the air supply tube to the ejection gas passage inside the discharge electrode, and a dust collection tube that fixes the dust collection tube of the dust collection mechanism Since the dust-absorbing tube fixing mechanism that connects the discharge electrode and the ground electrode to the suction passage is provided, the static eliminator can be compactly integrated.

Since the casing constituting the discharge electrode and the ground electrode is made of stainless steel and the insulating coating layers of the main body and the discharge electrode are made of fluororesin, the device is immersed in a container containing alcohol, for example, Can be easily washed.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a static eliminator showing an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view showing the vicinity of the base end portion of the discharge electrode of FIG.

FIG. 3 is an enlarged vertical sectional view showing the vicinity of the tip of the discharge electrode of FIG.

FIG. 4 is a vertical cross-sectional view of the vicinity of a tip portion of a discharge electrode in a usage state different from that of FIG.

FIG. 5 is a partially cutaway perspective view showing a modification of the tip shape of the discharge electrode.

FIG. 6 is a partially cutaway perspective view showing another modification of the tip shape of the discharge electrode.

[Explanation of symbols]

 (1) Main body (2) Discharge electrode (2a) (2b) Sharp part (3) Ground electrode (4) High voltage cable (5) Air tube for air supply (6) Air tube for dust collection (7) Hole (13) Set screw (16) Insulation coating layer (17) High pressure joint pin (18) Jet gas passage (19) Gas jet (20) Pipe connector (21) Hole (24) Suction passage (25) Suction port (28) Charge removal target Items (29) Dust removal hood (30) Tube connector (34) Air supply air joint (35) Passage (36) Dust removal air joint (37) Passage (39) Container (dust removal target)

Claims (9)

[Claims] 1. A discharge electrode, a ground electrode, a gas ejection mechanism, and a dust suction mechanism, and the ions generated by corona discharge between the discharge electrode and the ground electrode are blown onto an object to be neutralized by the gas ejected from the gas ejection mechanism. In the ionization static eliminator, the discharge electrode is made of a hollow good electrical conductor and is used to remove the static electricity from the static elimination target and remove the dust removed from the static elimination target by the suction mechanism. The electrode is composed of a hollow electric good conductor arranged around the discharge electrode, and a discharge gas passage of a gas discharge mechanism having a gas discharge port at the tip is formed inside the discharge electrode. An ionization static eliminator provided with a dust suction mechanism, characterized in that a suction passage of a dust suction mechanism having a suction port at the tip is formed therebetween. 2. An ionization static eliminator having a dust collecting mechanism according to claim 1, wherein the outer surface of the discharge electrode is covered with an insulating coating layer made of an electric insulator. 3. The ionization static eliminator having a dust collecting mechanism according to claim 1, wherein the discharge electrode is thin. 4. An ionization static eliminator having a dust suction mechanism according to claim 1, wherein a sharp portion is formed at the tip of the discharge electrode. 5. The insulating coating layer is 2 mm from the tip of the discharge electrode.
The ionization static eliminator provided with the dust collection mechanism according to claim 2, wherein the ionization static eliminator is projected in the gas ejection direction within the following range. 6. An ionization static eliminator having a dust suction mechanism according to claim 1, wherein a dust suction hood for covering the static elimination target is connected to the tip of the ground electrode. 7. An ionization static eliminator having a dust suction mechanism according to claim 6, wherein the dust suction hood also serves as a ground electrode. 8. A body part made of an electric insulator is provided, and the body part comprises:
Discharge electrode fixing mechanism that fixes the discharge electrode, ground electrode fixing mechanism that fixes the ground electrode, cable fixing that fixes the high voltage cable for supplying high voltage from the high voltage power supply and electrically connects the high voltage cable to the discharge electrode Mechanism, a gas supply tube fixing mechanism that fixes the gas supply tube of the gas ejection mechanism and connects the air supply tube to the ejection gas passage inside the discharge electrode, and a dust collection tube that fixes the dust collection tube of the dust collection mechanism An ionization static eliminator provided with the dust suction mechanism according to claim 1, further comprising a dust suction tube fixing mechanism for communicating the suction channel between the discharge electrode and the ground electrode. 9. The outer surface of the discharge electrode is covered with an insulating coating layer made of an electrical insulator, the discharge electrode and the ground electrode are made of stainless steel, and the insulating coating layer of the main body portion and the discharge electrode are made of fluororesin. The ionization static eliminator provided with the dust suction mechanism according to claim 8.