WO2014002960A1

WO2014002960A1 - Static eliminator

Info

Publication number: WO2014002960A1
Application number: PCT/JP2013/067271
Authority: WO
Inventors: 格無類井
Original assignee: シャープ株式会社
Priority date: 2012-06-28
Filing date: 2013-06-24
Publication date: 2014-01-03
Also published as: CN104429167A; JP2014010946A

Abstract

This static eliminator (11) is provided with an electrode (1) for generating ions in air, a blower (3) for sending air to the electrode (1), and a housing (4) containing the electrode (1) and the blower (3), generates an air stream containing ions in the housing (4), and discharges the air stream to the outside, and the housing (4) has an electric conductor (6) only on a wall surface (4b) with which the air stream is not in contact.

Description

Static eliminator

The present invention relates to a static eliminator that neutralizes a charged member to be neutralized by releasing positive ions and negative ions.

Conventionally, a static eliminator that discharges positive and negative ions has been used as one of the static eliminators that neutralize charged static elimination objects. This static eliminator generates positive ions and negative ions by applying a high voltage to the electrodes to separate molecules in the air. In general, the performance of a static eliminator is evaluated by two indicators: a static elimination time required to neutralize a static elimination object, and an ion balance for bringing the wall potential after the static elimination of the static elimination object close to zero. And in order to satisfy the static elimination time and ion balance of the static eliminator, it is required to release many positive and negative ions in a balanced manner.

As a method of generating a large number of ions, there are (1) applying a higher voltage to the electrode, (2) increasing the number of discharges, and (3) increasing the number of electrodes. However, in either method, a strong electric field is formed around the electrode, and the housing of the static eliminator is easily charged. When the static eliminator housing is charged, it causes problems such as electrostatic breakdown of devices approaching the static eliminator, influence on the approaching human body, and adhesion of dust to the static eliminator itself. Therefore, in general, various measures for preventing charging are taken in the ion generator.

As shown in FIG. 6, the ion generator 40 of Patent Document 1 is a conductive material in which an ion emission opening 44 is formed in a case 43 containing an ion generation element 42 that generates ions by discharge from a discharge electrode 41. A cover 45 made of a functional material is provided. The conductive material cover 45 is grounded via the limiting resistor 46, whereby charging of the cover 45 and retention of ions in the opening 44 are suppressed, and the generated ions are efficiently discharged.

As shown in FIG. 7, the ion generator of Patent Document 2 has a discharge electrode made up of a needle electrode 52 and a negative ion generator made up of a high-voltage power supply 53 in a main body case 51 made of ABS. Connected to. Then, only the negative ion blowout port 54 is used as a semiconductor, and the semiconductor is grounded to the ground 57 so that the charge is not generated, and even when the human body touches the blowout port 54, the human body is not affected. .

As shown in FIG. 8, the air conditioner of Patent Document 3 has a conductor 62 installed in the vicinity of the negative ion generator 61, and left and right honey 67 and upper and lower honey 68 arranged in the vicinity of the negative ion generator 61. By using a conductor, charging can be suppressed by discharging from the conductor, and dust and the like can be prevented from adhering to the wall surface on which the base frame 66 and the air conditioner are installed.

JP 2009-135027 A JP-A-11-191478 JP2007-107826

However, the ion generator of Patent Document 1 has a problem in that the balance between positive ions and negative ions released is disturbed. This is because negative ions are more mobile than positive ions, so negative ions are more likely to be collected at the grounded location, resulting in more positive ions being released and losing ion balance. It is considered.

For the same reason as in Patent Document 1, the ion generator of Patent Document 2 and the air conditioner of Patent Document 3 also have negative ions in the semiconductor or conductor disposed in the vicinity of the ion outlet 4 or the ion generator 1. It is collected preferentially, and as a result, more positive ions are released. For this reason, there exists a problem that ion balance collapses.

That is, since the techniques of Patent Documents 1 to 3 prevent charging by focusing only on the fact that ions released from the ion generator do not stay in the casing, it is required to discharge positive and negative ions in a balanced manner. It could not be applied to a static eliminator or the like.

The present invention has been made in view of such circumstances, and realizes a static eliminator that suppresses charging of the casing without lowering the static elimination speed and ion balance of the static eliminator.

In order to solve the above-described problems, the static eliminator of the present invention includes an electrode that generates ions in the air, a blower that blows air to the electrode, and a casing that includes the electrode and the blower, and the ions are discharged within the casing. A static eliminator that generates an air flow that is contained and discharges the air flow to the outside, wherein the housing has a conductor only on a wall surface that does not contact the air flow.

Further, the casing is characterized in that an insulating resin is used as a base material, and a conductive material is formed on the insulating resin by applying a conductive paint.

The housing is characterized in that an insulating resin is used as a base material and a metal foil is disposed on the insulating resin to form a conductor.

Further, the housing is characterized in that a conductive body is formed using a conductive resin as a base material, and an insulating resin is disposed on a wall surface in contact with the air flow of the conductive resin.

Also, the housing is characterized in that the conductor is electrically grounded.

According to the static eliminator of the present invention, it is possible to suppress charging of the static eliminator housing without lowering the static elimination speed or ion balance of the static eliminator.

It is sectional drawing which shows the basic composition of the static eliminator of this invention. 1 is a cross-sectional view illustrating a static eliminator of Example 1. FIG. It is sectional drawing which shows the modification of the static eliminator of Example 1. FIG. It is sectional drawing which shows the modification of the static eliminator of Example 1. FIG. 6 is a cross-sectional view illustrating a static eliminator of Example 2. FIG. It is sectional drawing which shows the ion generator of patent document 1. It is sectional drawing which shows the ion generator of patent document 2. It is a perspective view which shows the air conditioner of patent document 3. FIG.

An embodiment of the present invention will be described with reference to FIGS. 1 to 5 as follows. The configuration described below is only a specific example of the present invention, and the present invention is not limited to this.

FIG. 1 is a cross-sectional view showing a basic configuration of a static eliminator 10 of the present invention. The static eliminator 10 of the present invention includes a discharge electrode 1 that generates ions in the air, a voltage applying unit 2 that applies a discharge voltage to the discharge electrode 1, a blower 3 that blows air to the discharge electrode 1, and a discharge electrode 1. And a housing 4 that encloses the blower 3, and discharges an air flow 8 containing ions generated by the discharge electrode 1 from the blowout port 5 to discharge a charged charge removal object.

The static eliminator 10 is characterized in that the conductor is arranged only on the wall surface 4b where the air flow 8 containing ions does not contact in the housing 4 except for the wall surface 4a where the air flow 8 containing ions contacts. The air flow 8 including ions described in the present invention is the air from when the air blown from the blower 3 is mixed with the ions generated by the discharge electrode 1 until it is discharged to the outside of the outlet 5. It is the flow of.

Further, in FIG. 1, as an example, the wall surface 4a region in contact with the air flow 8 containing ions is shown by a broken line, and the wall surface 4b region not in contact with the air flow 8 containing ions is shown by a one-dot chain line. The air flow may vary depending on the shape of the casing 4 of the static eliminator 10, the position of the blower 3, and the like.

The static eliminator 10 of the present invention collects ions generated from the discharge electrode 1 because the conductor 4 is not disposed on the wall surface 4a in contact with the air flow 8 containing ions because the housing 4 has the above-described characteristics. In this case, the static elimination speed and ion balance are prevented from being lowered, and the casing 4 is charged by ions floating outside from the conductor disposed on the wall surface 4b where the air flow 8 containing ions does not contact. Since it is neutralized, it can be suppressed.

FIG. 2 is a cross-sectional view showing the configuration of the static eliminator 11 of the first embodiment. In the static eliminator 11 of the first embodiment, the same reference numerals are given to portions common to the basic configuration shown in FIG. 1, and detailed description thereof is omitted. In the static eliminator 11 of the first embodiment, the base material of the entire housing 4 including the blowout port 5 is formed of an insulating member such as a resin. Moreover, the conductive paint 6 which becomes a conductor is applied only to the wall surface 4b where the air flow 8 containing ions does not contact.

Note that FIG. 2 shows a case where the conductive paint 6 is applied to the entire surface of the wall surface 4b. However, if the portion where the conductive paint 6 is applied is a portion where the air flow 8 containing ions does not contact, It may be a part. For example, as shown in FIG. 3, it may be only a portion with a large area of the wall surface 4 b, or only a portion that is easily charged, such as near the outside of the outlet 5, as shown in FIG. 4.

As a result, since the insulating member such as resin is exposed on the wall surface 4a in contact with the air flow 8 containing the ions in the housing 4 and no conductor is present, the ions generated from the discharge electrode 1 are collected. Therefore, the charge removal rate and the ion balance can be prevented from being lowered, and charging of the housing 4 can be suppressed by the conductor formed on the wall surface 4b of the housing 4.

As the conductive paint 6, for example, a paint containing a metal powder of a Ni-based alloy is used. The conductive paint 6 is applied only on the wall surface 4b where the air flow containing the ions of the casing 4 does not contact with a film thickness of about 20 μm. A conductor having a rate of about 5.0Ω is formed. In order to further suppress the charging of the casing 4, it is desirable to ground the conductor formed of the conductive paint 6.

(Evaluation of static elimination performance)
Next, the evaluation result of the static elimination performance of the static eliminator 11 of Example 1 is demonstrated. The static elimination performance was evaluated by three items: static elimination speed, ion balance, and charge amount of the casing. The static elimination rate and ion balance were measured using a charged plate monitor (MODEL 159HH) manufactured by Lec Japan. Further, the amount of charge on the housing was measured using a wall potential meter (Electrostatic Voltmeter MODEL 347) manufactured by Trek Japan.

The static elimination speed is a time required for static elimination from a charge potential of +1000 V to +100 V and a charge potential of the static elimination object from +1000 V to +100 V with a metal plate having a size of 150 × 150 mm and a capacitance of 20 pF. The required time was measured, and the static elimination rate was evaluated from both average times. The shorter the average time required for the above static elimination, the faster the static elimination speed, and the higher the static elimination capability of the static eliminator.

The ion balance was evaluated by measuring the surface potential of the metal plate, which is the object of charge removal, for 10 seconds and calculating the average potential. The closer the average potential of the surface of the metal plate that has been neutralized is to 0V, the better the ion balance, and the higher the neutralization performance of the static eliminator. In addition, the static elimination speed and the ion balance were measured at a position where the distance from the static eliminator is 300 mm at one representative point on the front of the static eliminator.

The charge amount of the static eliminator 11 was measured at one representative point on the wall surface 4b of the housing 4 by measuring the surface potential with a surface potential meter. If the value of the charge amount is about several tens of volts or less, it can be generally determined that there is no problem.

(Evaluation result of Example 1)
In the static eliminator 11 of Example 1, a conductor made of the conductive paint 6 is formed only on the wall surface 4b where the air flow containing the ions of the casing 4 is not in contact. The time was 2.0 seconds, the ion balance was +2 V, and the housing charge was −5 V to +7 V.

(Evaluation result of Comparative Example 1)
As Comparative Example 1, the same static elimination performance was evaluated by removing the conductor from the static eliminator 11 of Example 1 (without applying the conductive paint 6). Was −3V, and the charge amount of the housing was −150V to + 80V.

(Evaluation result of Comparative Example 2)
As Comparative Example 2, a conductive paint 6 was applied to the entire housing 4 (wall surface 4a + wall surface 4b), and the same charge removal performance was evaluated. As a result, the charge removal time was 2.0 seconds, the ion balance was +15 V, and the housing was charged. The amount became -5V to + 3V.

In Comparative Example 1, there was no problem in the static elimination time and ion balance, but the case charge amount was large, and it was confirmed that the casing 4 was charged by the ions released from the static eliminator 11. In Comparative Example 1, there was no problem with the static elimination time and the case charge amount, but it was confirmed that the ion balance was greatly biased toward the positive electrode side.

That is, as can be seen from the above evaluation results, it is possible to suppress the charging of the casing 4 by imparting conductivity to the casing 4, but the conductivity is imparted to the wall surface 4a in contact with the air flow of ions. As a result, the ion balance is largely biased toward the positive electrode. This can be explained by the fact that when there is a conductor in the vicinity of the electrode 1 where ions are generated, negative ions having high mobility are collected and reduced by the conductor.

Therefore, the static eliminator 11 according to the first embodiment includes the electrode 1 that generates ions in the air, the blower 3 that blows air to the electrode 1, and the casing 4 that includes the electrode 1 and the blower 3. An air flow containing ions is generated and discharged to the outside, and by having a conductor only on the wall surface 4b where the air flow containing ions does not contact, maintaining a good ion balance and static elimination time, The charging of the casing 4 could be eliminated.

In the static eliminator 11 of the first embodiment, the conductive paint 6 is used as the conductor. However, the conductor is not limited to this and may be any member having conductivity, and conductive by metal foil, metal plating, or the like. You may form a body.

FIG. 5 is a cross-sectional view showing the configuration of the static eliminator 12 of the second embodiment. Portions common to the basic configuration shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. In the static eliminator 12 of the second embodiment, the entire base material constituting the casing 4 is configured by a member such as conductive ABS having conductivity, and the wall surface 4a in contact with the air flow including ions of the casing 4 is disposed on the wall surface 4a. The resin plate 7 having insulating properties is pasted. In general, an insulating member is used as a member constituting the case of the discharge electrode 1, the blower 3, and the outlet 5. Moreover, in Example 2 of FIG. 5, the resin ABS 7 is attached to a portion where the conductive ABS base material of the housing 4 is exposed and the air flow 8 containing ions contacts.

Thereby, the wall surface 4a in contact with the air flow 8 containing ions in the casing 4 loses conductivity due to the insulating resin plate 7, and the ions generated from the discharge electrode 1 are not collected, and the static elimination speed is reduced. And the wall balance 4b exposed to external floating ions has conductivity due to the conductive ABS or the like serving as the base material of the casing 4, so that the casing 4 is charged. Can be suppressed.

(Evaluation of static elimination performance)
Next, the evaluation result of the static elimination performance of the static eliminator 11 will be described. The static elimination performance was evaluated by three items: static elimination speed, ion balance, and charge amount of the casing. Since each evaluation method is the same as Example 1, detailed description is abbreviate | omitted.

(Evaluation result of Example 2)
The static eliminator 11 of Example 2 is made of conductive ABS as a base material constituting the casing 4, and is provided with an insulating resin on the wall surface 4a in contact with the air flow 8 containing ions. When the charge removal performance was measured, the charge removal time was 2.0 seconds, the ion balance was +2 V, and the charge amount of the enclosure was −5 V to +5 V.

(Evaluation results of Comparative Example 3)
As Comparative Example 3, the insulator was removed from the wall surface 4a in contact with the air flow 8 containing ions from the static eliminator 11 of Example 2 (no insulating resin was attached), and the same static elimination performance was evaluated. The static elimination time was 2.0 seconds, the ion balance was +12 V, and the housing charge was −1 V to +5 V.

In Comparative Example 3, it is possible to suppress the charging of the housing 4 by using conductive ABS as a base material constituting the housing 4. However, the wall surface 4a with which the air flow 8 containing ions comes into contact has conductivity, resulting in a loss of ion balance. This can be explained by the fact that when there is a conductor in the vicinity of the electrode 1 where ions are generated, negative ions having high mobility are collected and reduced by the conductor.

Therefore, the static eliminator 11 according to the second embodiment includes the electrode 1 that generates ions in the air, the blower 3 that blows air to the electrode 1, and the casing 4 that includes the electrode 1 and the blower 3. An air flow 8 containing ions is generated inside and released to the outside. In addition, a conductor was formed using the housing 4 as a base material of a conductive resin, and an insulating resin was disposed on the wall surface 4a on the conductive resin with which an air flow containing ions comes into contact. Thereby, the charge of the housing 4 could be eliminated while maintaining a good ion balance and static elimination time.

The present invention relates to a static eliminator that ionizes air by applying a high voltage to an electrode to generate positive ions and negative ions, and removes the charge of an object charged by the ions.
The invention relates to a means for suppressing charging of the housing.

By using the present invention, it is possible to solve the problem of charging of the housing without deteriorating the static elimination performance of the static eliminator such as the static elimination speed and ion balance. As a result, it is possible to contribute to the expansion of the range of use of the static eliminator for electronic devices that are becoming finer.

1 Electrode 2 Voltage application means 3 Blower (cross flow fan)
4 Housing 5 Outlet 6 Conductor (conductive coating)
7 Insulator (insulating resin)
8 Air flow containing ions

Claims

An electrode that generates ions in the air;
A blower for blowing air to the electrodes;
A housing containing the electrode and the blower;
A static eliminator that generates an air flow containing the ions in the housing and releases the air flow to the outside,
The static eliminator characterized in that the casing has a conductor only on a wall surface where the air flow does not contact.
2. The static eliminator according to claim 1, wherein the casing is made of an insulating resin as a base material and the conductive material is formed on the insulating resin by applying a conductive paint.
2. The static eliminator according to claim 1, wherein the casing is made of an insulating resin as a base material, and a metal foil is disposed on the insulating resin to form the conductor.
The casing forms the conductor using a conductive resin as a base material,
The static eliminator according to claim 1, wherein an insulating resin is disposed on a wall surface of the conductive resin that contacts the air flow.
The static eliminator according to any one of claims 1 to 4, wherein the conductor is electrically grounded with the conductor.