JP2015176697A - discharge electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge electrode for an electrifying or destaticizing device in which a needle part having a positionally-fixed tip can be disposed at high density in a power supply member.SOLUTION: A discharge electrode for an electrifying device for generating ions is secured to a power supply member 4 for applying a high voltage. The discharge electrode has a flange portion 7 having a circular outer periphery, a needle part 10a projecting from the center or substantially the center of the outer peripheral circle of one face of the flange portion 7, and a male screw portion 8 which is provided at the opposite side to the needle part 10a through the flange portion 7 and is to be joined to a fixing female screw 4a formed in the power supply member. The flange portion 7 has a tool hooking part 11 for hooking a screw driver tool inside the outer peripheral circle on the face 7b of the needle part side.

Description

  The present invention relates to a discharge electrode that generates ions around by discharge and is used for a charging or static eliminator.

2. Description of the Related Art Conventionally, an apparatus in which a large number of needle-like discharge electrodes are implanted on a substrate in order to uniformly charge a certain area with high density and to charge a charged object at high speed is known (Patent Document). 1).
In such a device, since a discharge electrode to which a high voltage is applied deteriorates due to use, it is also known that the discharge electrode is detachably attached to the device body side by screw connection so that it can be replaced. For example, there is a type in which a male screw is directly formed on the outer periphery of the discharge electrode needle and is screwed into a screw hole of a high voltage plate by turning it with a finger.

However, if a screw is turned with a finger, it is difficult to tighten a large number of discharge electrodes with the same force. For this reason, there may be a difference in the protruding length of the discharge electrode needle from the high voltage plate, resulting in variations in the tip position of the discharge electrode needle. Thus, if there are variations in the tip positions of a large number of discharge electrode needles, the discharge intensity for each discharge electrode will not be constant, and if this is used in a charging device, the charge density of the object to be processed will be uneven. May end up.
In such a non-uniform charging process, for example, when a filter member that captures foreign matter using static electricity is processed, a portion of the filter member that weakens the adsorption force of the foreign matter is formed. For this reason, the function as a filter cannot be performed sufficiently.

A discharge electrode in which the needle portion 2 protrudes from the hexagonal flange portion 1 shown in FIG. 8 has been considered as a solution that can solve the above-described problems and facilitate attachment work.
In this discharge electrode, the male screw portion 3 is fixed by screwing into a screw hole 4a formed in the high voltage bar 4 of the charging device. The high voltage bar 4 is fixed via an insulating material 6 in a casing 5 made of an insulating material, and is connected to a high voltage power source (not shown).
If the screw holes 4a are formed in the high voltage bar 4 at a predetermined interval, a large number of discharge electrodes having hexagonal flange portions 1 can be aligned as shown in FIG. it can.

Moreover, if the said flange part 1 is turned using tools, such as a spanner and a box wrench, and the external thread part 3 will be tightened until the flange part 1 contacts the surface of the high voltage bar 4, all discharge electrodes will be tightened similarly. It is done. That is, it is easy to make the fastening depth of the male screw portion 3 constant. Thus, if the discharge electrode as shown in FIG. 8, the tightening depth of the male screw portion 3 can be made constant, so that the tip position of the needle portion 2 of the discharge electrode disposed on the high voltage bar 4 is made constant, The discharge intensity from each needle part 2 can also be made equal. However, in order to turn the flange portion 1, a special tool that does not interfere with the needle portion 2 is required, for example, one having a recess for inserting the needle portion 2 inside the box wrench.
In addition, the literature regarding a discharge electrode as shown to FIG. 8, 9 was not found.

JP 2001-035686 A JP 2007-141691 A

When the conventional discharge electrode shown in FIGS. 8 and 9 is used, the hexagonal flange portion 1 is arranged on the surface of the high voltage bar 4 with a predetermined interval. Since these flange portions 1 are attached and detached by attaching a tool to the outer periphery thereof, a space is required between the adjacent flange portions 1 and 1 for inserting and turning the tool. For example, the adjacent flange portions 1 and 1 cannot be brought closer to the rotation range of the tool indicated by a two-dot chain line circle s.
For this reason, the distance L1 between the needle portions 2 and 2 is considerably larger than the dimension of the flange portion, and the needle portions 2 cannot be arranged so densely.

On the other hand, when the distance L1 between the needle portions 2 and 2 increases, the gradient of the ion concentration generated therebetween increases. Since the concentration of ions generated by the discharge decreases as the distance from the tip of the needle portion 2 increases, if the distance L1 between the needle portions 2 and 2 is large, the difference in ion concentration between the two becomes large. On the contrary, the smaller the distance between the needle portions 2 and 2, the more uniform the ion concentration, and uniform charging and static elimination becomes possible.
However, as shown in FIG. 9, in the conventional discharge electrode in which the flange portion 1 has a hexagonal shape, the distance L1 between the needle portions 2 and 2 disposed on the high voltage bar 4 cannot be reduced as described above. Therefore, uniform ion generation was difficult.
Further, the outer periphery of the hexagonal flange portion 1 is advantageously pointed at a hexagonal corner 1a so that the hexagonal flange portion 1 can be firmly held by a tool. However, discharge is likely to occur from the corner 1a. In order to prevent abnormal discharge from occurring at the corner 1a, it is necessary to increase the distance between the corner 1a and the external ground. Therefore, the distance a between the outer periphery of the flange portion 1 and the side wall 5a of the casing 5 made of an insulator has to be increased. For this reason, there is a problem that the needle portions 2 cannot be arranged at high density and the entire apparatus becomes large.
An object of the present invention is to provide a discharge electrode in which needle portions with a fixed tip position can be arranged on a power supply member with high density.

A first invention is a discharge electrode for a charging or static eliminator that is attached to a power supply member that applies a high voltage and generates ions, and has a flange portion having a circular outer periphery and an outer peripheral circle on one surface of the flange portion And a male thread portion that is provided on the opposite side of the needle portion via the flange portion and is coupled to a female thread for mounting formed on the power supply member. The portion is characterized in that on the surface of the needle portion side, a tool hooking portion for hooking a screwdriver tool is provided inside the outer circumferential circle.
Note that the needle portion protruding from the substantially center of the outer circumference circle includes a needle portion that is slightly deviated from the center of the outer circumference circle when the needle portion is provided in the manufacturing process of the discharge electrode. In other words, the needle portion is not provided at a position shifted from the center of the outer circumference circle.

  The second invention is characterized in that the length from the surface on the male screw portion side of the flange portion to the tip of the needle portion is set to a predetermined length.

  According to a third aspect of the present invention, the tool hooking portion includes a recess for inserting a tool formed on the surface of the flange portion on the needle portion side.

  4th invention is equipped with the support member which consists of the said flange part and an external thread part, and this support member and a separate needle member, The axis | shaft which passes along the center of the outer periphery circle | round | yen of the said flange part in the said support member, or substantially the center. A directional hole is formed, and the needle member is configured by press-fitting the needle member into the axial hole.

According to the first aspect, since the screw portion can be turned by the tool hooking and fastening portion inside the flange portion, a space for fitting the screw-turning tool to the outside of the flange portion becomes unnecessary. Therefore, it can be provided close to the limit as long as adjacent flange portions do not contact each other. Therefore, the interval between the needle portions located at the center of the flange portion or substantially at the center can be reduced.
In addition, since the needle portion is located at the center of the circle of the flange portion, when the screw is turned around the center of the circle, the position of the needle portion is constant regardless of the rotation angle of the screw. Therefore, the distance between the needle portions can be kept integral.
Further, by tightening the screws until the flange portion comes into contact with the power supply member, the tightening depth of the male screw portions of all the discharge electrodes can be made constant. Therefore, the tip position of the needle part can be kept constant.
Furthermore, since the circular flange portion does not have a sharp point that tends to discharge on the outer periphery, it is necessary to increase the distance from the casing to the outer periphery of the flange portion even when the discharge electrode is provided in the casing made of an insulator. Therefore, the apparatus can be downsized.

According to the second invention, the length from the power supply member surface to the needle tip can be made the treatment length by screwing the flange portion into contact with the power supply member. It is possible to easily align the tip positions of the needles of a large number of discharge electrodes, and to generate more uniform high-density ions.
A charging device using such a discharge electrode can perform uniform high-density charging, and is optimal for processing, for example, an electrostatic filter member.

  According to the third invention, since the hooking portion for the tool is constituted by the concave portion for inserting the tool, there is no convex portion that is likely to be discharged on the surface of the flange portion, and the possibility of abnormal discharge is further reduced. Therefore, in order to prevent abnormal discharge with the external ground, for example, it is not necessary to increase the distance between the casing made of an insulator and the flange portion so that the apparatus can be further downsized.

  According to the fourth aspect of the invention, since the support member and the needle member are separate members, the protruding length of the needle portion can be changed according to the press-fitting amount of the needle member. Therefore, common parts can be used when forming discharge electrodes having different protruding lengths of the needle portion, and productivity is increased.

FIG. 1 is a side view of the discharge electrode of the first embodiment. FIG. 2 is a cross-sectional view of an apparatus in which the discharge electrode according to the first embodiment is assembled. FIG. 3 is a plan view of an apparatus in which the discharge electrode according to the first embodiment is assembled. FIG. 4 is a plan view showing another arrangement example of the discharge electrodes of the first embodiment. FIG. 5 is a plan view of the discharge electrode of the second embodiment. FIG. 6 is a perspective view of a tool for attaching the discharge electrode of the second embodiment. FIG. 7 is a perspective view of the third embodiment. FIG. 8 is a side view of a conventional example. FIG. 9 is a plan view of a conventional example.

The discharge electrode of 1st Embodiment shown in FIGS. 1-4 is a needle | hook which has the support member 9 which consists of the externally circular flange part 7 and the external thread part 8 orthogonal to one surface 7a of this flange part 7, and a point. It is comprised with the member 10. FIG.
The flange portion 7 and the male screw portion 8 constituting the support member 9 have an axis passing through the center of the outer circle of the flange portion 7 as a common rotation axis, and the support member 9 moves the support member 9 along the rotation axis. An axial hole 9a is provided therethrough.

The needle member 10 is press-fitted into the axial hole 9a, and the pointed side protruding from the surface 7b opposite to the male threaded portion 8 in the flange portion 7 is defined as a needle portion 10a. The length h from the surface 7a on the male screw portion 8 side of the flange portion 7 to the tip of the needle portion 10a can be adjusted by the press-fitting length of the needle member 10 into the axial hole 9a.
As in the prior art, such a discharge electrode is also fixed by screwing the male screw portion 8 into a screw hole 4a formed in the high voltage bar 4 as a power supply member, as shown in FIG. 2, and the flange portion 7 is fixed to the high voltage bar. By screwing until it contacts 4, the tip position of the needle portion 10 a can be made constant from the high voltage bar 4. The screw hole 4a is formed with a female screw for mounting according to the present invention for mounting the discharge electrode.
In the first embodiment, the same reference numerals as those of the conventional example are used for the same constituent elements as those of the conventional example shown in FIGS.

Further, as shown in FIGS. 2 and 3, a concave portion 11 for inserting a tool having a hexagonal opening is formed on the surface 7b of the flange portion 7 on the side of the needle portion 10a. The recess 11 is formed such that the hexagonal center thereof coincides with the center of the circle of the flange portion 7, and an axial hole 9 a into which the needle member 10 is press-fitted is formed at the center.
Then, if a screwdriver such as a hexagon stick wrench is inserted into the recess 11, the male screw portion 8 can be turned. This recessed part 11 is a recessed part for tool insertion of this invention, and is a tool hook part. However, the tool used here has an axial recess formed in the center of the hexagon stick wrench that can accommodate the needle 10a.

  In the discharge electrode according to the first embodiment, a tool for tightening the male screw portion 8 in the screw hole 4a of the high voltage bar 4 which is a power supply member of the present invention is inserted into the recess 11 inside the flange portion 7 and turned. Therefore, unlike the conventional example shown in FIGS. 8 and 9, there is no need for a gap for fitting the tool around the outer periphery of the flange portion 7. FIG. Therefore, as shown in FIG. 3, the adjacent flange portions 7 and 7 can be brought close to each other as long as they do not contact each other. Therefore, the interval between the adjacent needle portions 10a, 10a located at the center of each flange portion 7 can be made closer to the diameter of the flange portion 7, and a large number of needle portions 10a are arranged at high density on the high voltage bar 4. Can do.

Further, if the diameter of the flange portion 7 is slightly larger than the diameter of the screw hole 4a of the high voltage bar 4, the function of maintaining the axial position of the tightened discharge electrode can be exhibited, so it is not necessary to make it so large. As the diameter of the flange portion 7 is reduced, the distance L2 between the needle portions 10a and 10a can be reduced.
Actually, a charging device is realized in which a flange portion 7 having a diameter of 4 [mm] is provided on a male screw portion 8 having a diameter of about 2 [mm], and the distance L2 between the needle portions 10a and 10a is set to 5 [mm]. .
Further, in FIG. 3, the discharge electrode needles of the first embodiment are arranged in one row, but if the two or more rows are arranged as shown in FIG. Ions can be generated uniformly.

Furthermore, since the flange portion 7 of the first embodiment is circular, there is no sharp corner or the like unlike the conventional hexagonal flange portion 1. Therefore, it is not necessary to increase the distance b from the casing 5 in consideration of abnormal discharge with the external ground. Therefore, the entire apparatus can be reduced in size.
In the first embodiment, the needle member 10 and the support member 9 are separate members, and the discharge member is formed by press-fitting the needle member 10 into the axial hole 9a. However, the discharge electrode is formed. The method is not limited to this. For example, the needle portion 10a may be erected on the bottom surface of the recess 11 formed in the flange portion 7 and fixed by welding or the like.
However, if the discharge electrode is formed by press-fitting the needle member 10 into the axial hole 9a of the support member 9 as in the first embodiment, the protruding length h of the needle portion 10a from the flange portion 7 will be described. It is also possible to form the discharge electrode with different parts using the same component. That is, there is a merit that parts can be shared.

The second embodiment of FIG. 5 is different from the recess 11 of the first embodiment in the shape of the recess for inserting the screwdriver tool formed on the surface 7b of the flange portion 7 on the needle portion 10a side. On the surface 7b of the flange portion 7 on the side of the needle portion 10a, a pair of tool insertion recesses 12 and 12 having a square opening shape are formed.
Other configurations are the same as those in the first embodiment, the same reference numerals are used for the same components as those in the first embodiment, and FIGS.
Therefore, the discharge electrode of the second embodiment can be screwed into the screw hole 4a of the high voltage bar 4 by inserting and turning a screwing tool in the recesses 12 and 12 (see FIG. 2). .

In addition, as a tool inserted in the said recessed parts 12 and 12 and turning, what is shown in FIG. 6 can be considered. This tool is provided with an insertion portion 14 that is bifurcated into a handle 13. A pair of end portions 14 a, 14 a of the insertion portion 14 has a shape matching the concave portions 12, 12 of the flange 7. The end portions 14 a and 14 a are inserted into the recesses 12 and 12, and the flange portion 7 is rotated by positioning the needle portion 10 a in the central gap 15, so that the discharge electrode can be attached to the high voltage bar 4.
Also in the second embodiment, since the outer shape of the flange portion 7 is circular and the recesses 12 and 12 for inserting the tool are formed inside the outer circle of the flange portion 7, the first embodiment shown in FIG. Similarly to the above, there is no need for a gap for the tool between the adjacent flange portions 7 and 7, and the needle portions 10a can be arranged with high density.
Further, since there is no pointed portion that easily discharges on the outer periphery of the flange portion 7, the distance b between the outer periphery of the flange portion 7 and the casing 5 can be shortened (see FIG. 3).

In the first and second embodiments, the recesses 11 and 12 for inserting the tool are formed in the flange portion 7 as tool hooks and hooks, but the tool hooks and hooks are not limited to the recesses.
For example, in the third embodiment shown in FIG. 7, a pair of tool latching convex portions 16 and 16 are formed on the surface 7b of the circular flange portion 7 on the needle portion 10a side. A screwdriver tool is hooked on the projections 16 and 16 to turn the screw. When such convex parts 16 and 16 are turned, a tool provided with a concave part matching the convex part 16 may be used at the tip of the insertion part 14 shown in FIG. The configuration other than the projections 16 for holding the tool is the same as that of the first embodiment shown in FIG.
Since the discharge electrode of the third embodiment also does not need to be fitted with a screwing tool on the outer periphery of the flange portion 7, the outer periphery of adjacent flange portions 7 can be provided close to each other, and a large number of needle portions 10a can be provided. Is the same as the above-described other embodiments.

As described above, if the outer shape of the flange portion 7 is circular and the tool latching portion is provided inside the circle, the tool latching portion can be a concave portion or a convex portion. Even in such a shape, the distance between the needle portions 10a and 10a can be minimized and arranged at high density.
However, it is preferable that the convex part for hooking the tool has a shape with no sharp part on the outer periphery of the convex part. This is because if there is a pointed portion on the outer periphery, the possibility of abnormal discharge is higher than when there is no pointed portion, and the distance to the casing 5 must be increased.
On the other hand, the convex portion for holding the tool requires a surface that receives the rotational force in close contact with the screw turning tool. Therefore, it is considered preferable that the projecting portion for holding the tool has, for example, a shape in which another portion is curved or a corner is rounded while a plane that contacts the tool is provided.

  In the first to third embodiments, the example in which the plurality of discharge electrodes are attached to the high voltage bar 4 that is the power supply member of the present invention has been described. The discharge electrodes can be densely arranged. Such a plate-shaped power supply member is useful for charging a large area with high density.

  It can be used in various fields where high-density charging is required.

4 High-voltage bar 4a Screw hole 7 Flange part 8 Male thread part 9 Support member 9a Axial hole 10 Needle member 10a Needle part 11 Recess 12 (for tool insertion) Recess 16 (for tool latch) Convex

Claims (4)

A discharge electrode for a charging or static elimination device attached to a power supply member for applying a high voltage and generating ions,
A flange with a circular outer periphery;
A needle portion projecting from the center or substantially the center of the outer peripheral circle of one surface of the flange portion;
It is provided on the opposite side to the needle part via the flange part, and comprises a male thread part for coupling to a female thread for attachment formed on the power feeding member,
The discharge electrode according to claim 1, wherein the flange portion includes a hooking portion for a tool for hooking a screwing tool on the inner surface of the outer peripheral circle on the surface on the needle portion side.   The discharge electrode according to claim 1, wherein a length from a surface of the flange portion on the male screw portion side to a tip of the needle portion is set to a predetermined length.   3. The discharge electrode according to claim 1, wherein the hooking portion for the tool includes a recess for inserting a tool formed on a surface of the flange portion on the needle portion side. A support member comprising the flange part and the male screw part;
With this support member and a separate needle member,
The axial direction hole which passes through the center or the substantially center of the outer periphery circle | round | yen of the said flange part is formed in the said support member, The said needle member is press-fitted in this axial direction hole, The said needle part was comprised. The discharge electrode according to any one of the above.

Images