JP5805483B2 - Static eliminator - Google Patents

Description

  The present invention relates to a static eliminator.

  2. Description of the Related Art Conventionally, a static eliminator that generates ions by corona discharge through application of a high voltage to a discharge needle and blows the generated ions to a static elimination target is known. In this static eliminator, the foreign matter (insulator) in the air precipitates on the discharge needle, and the generation efficiency of ions decreases with time. For this reason, it is necessary to periodically clean the discharge needle. For example, the static eliminator of Patent Document 1 is configured such that cleaning can be performed with the discharge needle attached to the discharge bar.

JP-A-10-125445

  However, since the discharge needle is surrounded by an insulator pipe, there is a problem that it is difficult to clean. In particular, in the case of the static eliminator of Patent Document 1, the tip of the discharge needle is retracted from the tip of the insulator pipe in order to protect the discharge needle. For this reason, it was difficult to clean around the discharge needle. Further, since the discharge needle is thin, there is a possibility that it is broken, and care must be taken during the maintenance.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a static eliminator capable of easily and safely cleaning a discharge needle.

In order to achieve the above object, according to the first aspect of the present invention , a plurality of ion emission ports are formed on an opposing surface arranged so as to face an object to be neutralized, and ions are generated at each ion emission port. In the static eliminator in which the discharge needles are respectively arranged, the plurality of ion emission ports are arranged in a line along a predetermined linear direction, and a pair of protective walls are formed to protrude toward the static elimination target side. And a plurality of the ion emission ports are formed in a straight line along the arrangement direction of the ion emission ports, and the pair of protective walls are formed so as not to be connected at the end of the main body. the gist that you are.

According to a second aspect of the present invention, in the first aspect of the present invention, the pair of protective walls are separated from each other at their linear ends without being connected to each other , and the protruding width is gradually reduced. The gist is that it is set .
According to a third aspect of the present invention, in the first or second aspect of the present invention, the surface of the protective wall opposite to the surface facing the ion emission port is spread outward. The gist is that it is tilted.

The gist of the invention according to claim 4 is that, in the invention according to any one of claims 1 to 3 , the protective wall is formed of an insulator.

  According to the present invention, the discharge needle can be easily and safely cleaned.

(A) is a disassembled perspective view of the main-body part and discharge needle unit of a static elimination apparatus, (b) is a perspective view of a static elimination apparatus. The perspective view which cut | disconnected the upper part of the main-body part. AA line sectional view of Drawing 1 (b). BB sectional drawing of FIG. CC sectional view taken on the line of FIG. The DD sectional view taken on the line of FIG. The top view which shows the lower part of a main-body part. The top view which shows the lower part of a main-body part. The top view which shows a protection wall. Sectional drawing which shows the cross section of a protective wall.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown to Fig.1 (a), the static elimination apparatus 11 is equipped with the main body part 12 and the discharge needle unit 13 attached to the said main body part 12 so that attachment or detachment is possible.

  The discharge needle unit 13 includes a rectangular plate-shaped base 21, four holding portions 22 provided on the lower surface of the base 21, and four discharge needles 23 held by the holding portions 22. The base 21 and each holding part 22 are integrally formed of a synthetic resin material. Each holding portion 22 is formed in a columnar shape, and is provided in a straight line at a constant interval along the direction in which the base 21 extends. As shown in FIG. 5, the proximal end portion of the discharge needle 23 is fixed to the distal end portion of each holding portion 22 in a fitted state. A conical coil spring 24 is inserted in an intermediate portion of each discharge needle 23 and is fixed. The conical coil spring 24 is formed by winding a conducting wire in a conical shape. The small diameter portion 25 of the conical coil spring 24 is accommodated in a recess 23 a formed at the tip of the holding portion 22 in a state of being fixed to the discharge needle 23. The large diameter portion 26 of the conical coil spring 24 is maintained in a non-contact state with the discharge needle 23. In addition, an annular packing 27 is attached to the lower surface of the base 21 in a state of being inserted through the base of each holding portion 22.

  As shown to Fig.1 (a), the main-body part 12 is formed in the rectangular parallelepiped shape with the synthetic resin material. Four insertion ports 31 are formed on the upper surface of the main body 12. Each insertion port 31 is provided so as to be coaxial with each discharge needle 23 of the discharge needle unit 13 at a constant interval along the extending direction of the main body portion 12. The inner diameter of each insertion port 31 is set larger than the outer diameter of each holding portion 22 of the discharge needle unit 13.

  Further, as shown in the figure, two engaging members 32 are formed on the upper surface of the main body 12. These engaging members 32 are provided between two insertion ports 31 adjacent to each other on both end sides in the extending direction of the main body portion 12. As shown in FIG. 4, the engaging member 32 is formed at the two arm portions 33 facing each other in the width direction orthogonal to the extending direction of the main body portion 12, and at the tips of these arm portions 33. Two protrusions 34 are provided. These protrusions 34 protrude on opposite sides in the width direction of the main body 12. Further, as shown in an enlarged view in the upper part of FIG. 3, inclined surfaces 35 are formed on the lower surfaces of the projecting portions 34 on the outer sides in the extending direction of the main body portion 12. The slope 35 is inclined so that the thickness of the protrusion 34 becomes thinner as it goes outward along the direction in which the main body 12 extends.

  As shown in FIG. 2, an air channel 100 is formed inside the main body 12. The air flow path 100 is extended along the direction in which the main body 12 extends. In addition, four cylindrical portions 41 are formed in the main body portion 12 (air flow channel 100) so as to correspond to the four insertion ports 31, respectively. As shown in FIG. 5, each insertion port 31 extends through the tubular portion 41 to the vicinity of the bottom surface of the main body portion 12. In the center of the bottom wall of each insertion port 31, an ion emission port 42 is formed so as to penetrate therethrough. As shown in FIG. 5, a small hole 41 a is formed in the peripheral wall of each cylindrical portion 41. The small hole 41 a is formed in a truncated cone shape that decreases in diameter as it goes inward of the cylindrical portion 41.

  As shown in FIG. 2, on the inner bottom surface of the main body portion 12, four air holes 43 are formed around each cylindrical portion 41. As shown in FIG. 6, each air blowing hole 43 extends to the vicinity of the bottom surface of the main body 12. An air outlet 44 is formed through the bottom wall of each air hole 43.

  As indicated by a broken line in FIG. 3, an electrode 51 is embedded below the air flow path 100 in the main body 12. The electrode 51 is formed in a long shape from a metal material such as copper. The electrode 51 extends along the air flow path 100 and is provided over a range corresponding to each cylindrical portion 41. As shown in FIG. 5, the electrode 51 is provided through each insertion port 31 in the extending direction of the main body 12. In the electrode 51, a through hole 52 is formed in a portion exposed inside each insertion port 31. Each through hole 52 is coaxial with each discharge needle 23. The inner diameter of the through hole 52 is set to be larger than the outer diameter of the discharge needle 23 and smaller than the outer diameter of the large diameter portion 26 of the conical coil spring 24.

  As shown in FIG. 1B, a tube joint 63 is provided at the end of the main body 12. A compressed air source is connected to the tube joint 63 via an air tube (not shown). Compressed air from the compressed air source is supplied to the inside of the main body 12, that is, the air flow path 100 through the tube joint 63. A high voltage power supply (AC) (not shown) is connected to the end of the main body 12 opposite to the tube joint 63 via a power cable 64. The electric power from the high voltage power source is applied to the electrode 51 via the power cable 64.

  Next, how the discharge needle unit 13 is attached to the main body 12 will be described. As shown in FIG. 1A, the discharge needle unit 13 is attached to the main body 12 from above. Each discharge needle 23 and each holding part 22 are inserted into each insertion port 31 of the main body part 12 from above. As shown in FIG. 5, the downward displacement of the discharge needle unit 13 is regulated by the lower surface of the base 21 coming into contact with the upper surface of the main body portion 12 via each packing 27. In this state, each insertion port 31, more precisely, a gap formed between the inner peripheral surface of each cylindrical portion 41 and the outer peripheral surface of each holding portion 22 is closed from above by each packing 27. .

  In this state, the large-diameter portion 26 of each conical coil spring 24 is in elastic contact with the upper surface of the electrode 51. That is, each discharge needle 23 is connected to the electrode 51 in a conductive state via each conical coil spring 24. Each conical coil spring 24 is maintained in a slightly compressed state. For this reason, the contact pressure with respect to the electrode 51 of each conical coil spring 24 is ensured suitably. In this state, each discharge needle 23 is inserted through each through-hole 52 of the electrode 51 in a non-contact state. The tip of each discharge needle 23 is inserted in a non-contact state inside each ion emission port 42 of the main body 12.

By assembling the main body 12 and the discharge needle unit 13, two air supply paths are formed inside the main body 12 so as to be branched from the air flow path 100.
That is, as indicated by arrows in FIG. 5, a small hole 41 a of each cylindrical portion 41, a gap (each insertion port 31) between the inner peripheral surface of each cylindrical portion 41 and the outer peripheral surface of each holding portion 22, A first branch channel 101 is formed from each through hole 52 of the electrode 51. Further, as indicated by an arrow in FIG. 6, a second branch flow path 102 is formed from each blower hole 43. Then, the compressed air supplied from the outside to the air flow path 100 is discharged to the outside from each ion emission port 42 via the first branch flow path 101 (first air supply path). Further, the compressed air supplied to the air flow path 100 is discharged from each blower port 44 via the second branch flow path 102 (second air supply path).

  The air diverted from the air flow path 100 to the first branch flow path 101 is an air flow that passes around each discharge needle 23, that is, as sheath air, together with ions generated near the tip of each discharge needle 23 and each ion emission port. 42 is discharged to the outside. Then, around the ions discharged from each ion discharge port 42, an air flow discharged from each blower port 44, that is, assist air is generated, so that the ions are blown farther.

  The static eliminator 11 of the present example includes the main body 12 in order to prevent the discharge needle unit 13 from dropping from the main body 12 and to ensure the airtight state of each first branch flow path 101. A holding mechanism 201 for the discharge needle unit 13 is provided.

  As shown in FIG. 1A, the holding mechanism 201 includes two slide holders 202. The slide holder 202 includes a rectangular top plate 203 and two side walls 204 orthogonal to the top plate 203. These side walls 204 are provided at two long side edges along the direction in which the top plate 203 extends, and face each other in the width direction orthogonal to the direction in which the top plate 203 extends. The facing interval between the two side walls 204 is set to be approximately the same as the width of the base 21 of the discharge needle unit 13. In addition, a rectangular plate-like engagement member 205 is formed at the tip edge of each of the two side walls 204. These engaging members 205 are opposed to the top plate 203 in parallel. The inner shape of the slide holder 202 corresponds to the outer shape of the end portion of the base 21.

  These slide holders 202 are mounted in such a manner that the two side walls 204 are directed downward and are slid from both ends of the base 21 toward the center. As shown in FIG. 4, the two engaging members 205 are interposed in a gap formed between the base 21 and the upper surface of the main body 12. As shown in FIG. 3, the slide holder 202 is reciprocally slid along the direction in which the discharge needles 23 are arranged so as to enclose the end of the base 21 of the discharge needle unit 13 attached to the main body 12. Move. Specifically, the slide holder 202 is displaced between a first position P1 indicated by a solid line in FIG. 3 and a second position P2 also indicated by a two-dot chain line.

  The first position P1 is a position where the discharge needle unit 13 is in a holding state in which the discharge needle unit 13 is fixedly held with respect to the main body portion 12. That is, the engaging member 205 of the slide holder 202 is engaged with the protrusion 34 of the engaging member 32 that is a part of the main body 12 in the direction of removing the discharge needle unit 13. For this reason, displacement of the discharge needle unit 13 in the direction in which the discharge needle 23 is pulled out is restricted.

  The second position P2 is a position where the holding state of the discharge needle unit 13 is released and the holding state is not held. That is, the engaging member 205 of the slide holder 202 is present at a position that is disengaged from the protrusion 34 of the engaging member 32 on the main body 12 side. Further, as shown in FIG. 1A, the engaging member 205 exists at a position disengaged from the discharge needle unit 13. That is, there is nothing that interferes with the discharge needle unit 13 in the removal direction of the discharge needle unit 13. For this reason, the discharge needle 23 can be removed from the main body 12.

  Further, as shown in FIG. 7, a plurality of ion emission ports 42 are formed at regular intervals along the longitudinal direction of the main body portion 12 on the lower surface of the main body portion 12, that is, on the opposite surface facing the static elimination target. It is arranged on a straight line. When the discharge needle unit 13 is mounted on the main body portion 12, the tip of the discharge needle 23 is set so as to be substantially at the same position as the lower surface of the main body portion 12 or slightly protrude. The protective walls 60 and 61 are integrally formed with the main body 12 and are made of an insulating resin.

  A pair of protective walls 60 and 61 are formed on the lower surface of the main body 12 so as to sandwich the plurality of ion emission ports 42. As shown in FIG. 5, the protective walls 60 and 61 are formed so as to protrude downward (toward a charge removal target). The protruding width of the protective walls 60 and 61 is formed so as to be at least longer than the tip of the discharge needle 23, and even if a human finger enters between the pair of protective walls 60 and 61, the tip of the discharge needle 23. The length is not touched.

  The protective walls 60 and 61 are formed so as to extend linearly along the longitudinal direction of the main body 12. The pair of protective walls 60 and 61 are adjacent to the ion emission port 42, and the length (diameter length) of the ion emission port 42 in a direction orthogonal to the arrangement direction of the ion emission port 42. Are arranged at a distance only. Note that the distance between the pair of protective walls 60 and 61 is a distance that prevents the operator's finger from entering (0.5 cm in this embodiment). The protective walls 60 and 61 are formed so as not to be connected at the end of the main body 12. Further, the protective walls 60 and 61 are set so that the protruding width gradually decreases at the end portions.

  Further, as shown in FIGS. 5 and 6, the surface (outer surface) opposite to the surface facing the ion emission port 42 of the protective walls 60 and 61 is formed to be inclined so as to expand toward the outer side. ing. As a result, as indicated by the arrow in FIG. 6, ions emitted from the ion emission port 42 are easily moved to the outside along the protective walls 60 and 61, and are emitted from the blower port 44 arranged on the outside. It becomes easy to be carried by assist air. Further, since the corners of the protective walls 60 and 61 are rounded, it is possible to prevent the corners from hitting the operator's finger.

  Here, a cleaning method of the ion emission port 42 and the discharge needle 23 will be described. Since the protective walls 60 and 61 are configured as described above, the plurality of ion emission ports 42 and the discharge needles 23 can be easily made by moving the brushes and the like along the protective walls 60 and 61 using the protective walls 60 and 61 as a guide. Can be cleaned. Further, by ejecting along the groove between the protective walls 60 and 61, the dust between the protective walls 60 and 61 and the dust around the ion emission port 42 or the discharge needle 23 can be easily removed.

Next, the operation of the static eliminator configured as described above will be described.
When a high voltage (alternating current) is applied from the high voltage power source to each discharge needle 23 via the electrode 51 and each conical coil spring 24, a corona discharge is generated near the tip of each discharge needle 23, and each discharge needle 23 is Ambient air is ionized. In this example, an alternating current method in which corona discharge is generated by applying an alternating voltage to each discharge needle 23 is employed, so that positive and negative ions are generated alternately.

  Ions generated around each discharge needle 23 by corona discharge are diverted from the air flow channel 100 to the first branch flow channel 101, and the sheath air passing around each discharge needle 23, together with each ion emission port 42. Released to the outside. By flowing sheath air around each discharge needle 23, the deposition of foreign matter (insulator) on each discharge needle 23 or the adhesion of foreign matter is suppressed. Further, the pressure of the sheath air is made smaller than the air pressure supplied to the air flow path 100 by the small hole 41 a provided on the upstream side of the first branch flow path 101. For this reason, ion generation efficiency is maintained.

  Then, around the ions discharged from each ion discharge port 42, assist air is generated that is branched from the air flow channel 100 to the second branch flow channel 102 and discharged from each blower port 44. By this assist air, ions emitted from each ion emission port 42 are carried farther. By supplying the ions to the charge removal target, the charge of the target is neutralized and static electricity is removed.

As described above in detail, the present embodiment has the following effects.
(1) A pair of protective walls 60 and 61 are formed so as to protrude toward the static elimination target side, and along the arrangement direction of the ion emission ports 42 (longitudinal direction of the main body portion 12) so as to sandwich the plurality of ion emission ports 42. Formed on a straight line. For this reason, the plurality of ion emission ports 42 and the discharge needles 23 can be cleaned together by moving the brush or the like along the protective walls 60 and 61 instead of the protective walls 60 and 61 as a guide. That is, since the pair of protective walls 60 and 61 are formed on a straight line so as to sandwich the plurality of ion emission ports 42, they serve as guides and are easy to clean. Moreover, since the protective walls 60 and 61 are not connected at the end portions, dust and the like can be easily ejected by moving the brush to the end portions.

  (2) At the end portions of the pair of protective walls 60 and 61, the protruding width is set to be gradually reduced. For this reason, when the brush or the like is moved along the protective walls 60 and 61, the dust that has come off at the end can be easily removed.

  (3) Moreover, the surface (outer surface) on the opposite side to the surface facing the ion emission port 42 of the protective walls 60 and 61 is formed so as to be inclined so as to extend outward. As a result, the ions emitted from the ion emission port 42 can easily move outward along the protective walls 60 and 61, and the assist air discharged from the air blowing port 44 disposed outside the protective walls 60 and 61 is used. It will be easy to carry down. Further, the corners of the protective walls 60 and 61 are formed to be rounded. Thereby, it is possible to prevent the worker's finger from hitting the corner.

(4) The protective walls 60 and 61 are made of an insulating resin. For this reason, the protective walls 60 and 61 are not charged and ions can be efficiently discharged.
(5) The distance between the protective walls 60 and 61 is a distance that is separated by the length of the ion emission port 42 in the direction orthogonal to the arrangement direction of the ion emission port 42. For this reason, it is possible to prevent the finger from entering the ion emission port 42 by setting the distance between the protective walls 60 and 61 to such a length that the finger cannot enter. That is, it is possible to prevent the finger from touching the discharge needle 23.

In addition, you may change the said embodiment as follows.
In the above embodiment, four ion emission ports 42 are provided, but the number of ion emission ports 42 and discharge needles 23 may be arbitrarily changed. For example, as shown in FIG. 8, the number of ion emission ports 42 may be changed to eight and arranged on a straight line with a predetermined interval. At that time, the lengths of the protective walls 60 and 61 may be extended according to the number of the ion emission ports 42. Moreover, you may make it pinch | protect the protective walls 60 and 61 partly (for example, 4 each).

  In the above embodiment, the protective walls 60 and 61 are provided as a pair on a straight line so as to sandwich the plurality of ion emission ports 42. However, there is a passage groove through which the brush passes on a predetermined straight line. As long as it is configured, the ion emission port 42 may be surrounded by any shape. For example, as shown in FIG. 9, the protective wall 70 may be formed so as to protrude toward the charge removal target so as to surround the ion emission openings 42 one by one. At this time, the protective wall 70 may be provided with a brush passage groove 42a (notched structure portion) along a predetermined linear direction passing through the center of the ion emission port 42. In this way, dust can be easily removed when cleaning the ion emission port 42.

-In above-mentioned embodiment, although the protective walls 60 and 61 were integrally formed from the main-body part 12, it is not necessary to form integrally.
-In the said embodiment, although the protrusion width | variety was shortened gradually in the edge part of the protective walls 60 and 61, it is not necessary to shorten.

  In the above embodiment, the corners of the protective walls 60 and 61 are formed to be rounded. However, as shown in FIG. At this time, it is inclined so as to spread outward.

-In above-mentioned embodiment, although the protective walls 60 and 61 were inclined so that it might spread toward the outer side, it is not necessary to incline.
Next, a technical idea that can be grasped from the above embodiment and another example will be added below.

(A) The static eliminator according to any one of claims 1 to 3 , wherein a size of the ion emission port is larger than a cross-sectional area of the discharge needle.
(B) The static eliminator according to claim 1, wherein a groove is formed in the protective wall along a predetermined linear direction passing through the center of the ion emission port.

(C) a pair of the protective wall, in the direction orthogonal to the arrangement direction of the ion emission port, claims 1, characterized in that it is arranged at a distance apart by the length of the ion discharge outlet neutralization apparatus according to any one of the four.

  DESCRIPTION OF SYMBOLS 11 ... Static elimination apparatus, 12 ... Main part, 13 ... Discharge needle unit, 21 ... Base, 22 ... Holding part, 23 ... Discharge needle, 27 ... Packing (elastic member), 31 ... Insertion port, 41a ... Small hole (throttle) Part), 42 ... ion discharge port, 44 ... blower port, 60, 61 ... protective wall.

Claims (4)

In the static eliminator in which a plurality of ion emission ports are formed on the opposing surface arranged so as to oppose the static elimination target, and discharge needles that generate ions are arranged in the respective ion emission ports,
The plurality of ion emission ports are arranged in a line along a predetermined linear direction,
A pair of protective walls are formed to protrude toward the charge removal target side, and are formed on a straight line along the arrangement direction of the ion emission ports so as to sandwich the plurality of ion emission ports ,
The pair of protective walls are formed so as not to be connected to each other at an end of the main body . 2. The static eliminator according to claim 1 , wherein the pair of protective walls are set so as not to be connected to each other but to be separated from each other in an end portion in the linear direction and to have a gradually reduced protrusion width . 3. The static eliminator according to claim 1, wherein a surface of the protective wall opposite to the surface facing the ion emission port is inclined so as to spread outward. 4. apparatus. The protective wall, neutralization apparatus as claimed in any one of claims 1 to 3, characterized in that it is formed by an insulator.

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