JP5654400B2 - 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, deterioration such as wear of the discharge needle occurs over time. Moreover, the foreign matter (insulator) in the air precipitates on the discharge needle, etc., so that the ion generation efficiency decreases with time. For this reason, it is necessary to periodically replace the discharge needle or remove and clean it.

  For example, in the static eliminator of Patent Document 1, a mounting hole communicating with the nozzle is formed on the rear surface on the opposite side of the nozzle provided on the front surface of the main body case, and a discharge needle unit is screwed into the mounting port. During maintenance of the discharge needle, the discharge needle unit can be removed from the main body case by rotating it in the direction opposite to the tightening direction.

  Moreover, in the static elimination apparatus of patent document 1, the front-end | tip of the discharge needle of a discharge needle unit is inserted in the ion generation chamber inside a nozzle through the air supply chamber provided in the inside of a main body case. Then, compressed air is introduced into the air supply chamber from the outside through an air passage. The compressed air introduced into the air supply chamber generates ions as an air flow (sheath air) that passes around the discharge needle. Ions in the room are released to the front of the nozzle. Here, the compressed air introduced from the outside is also released to the front of the nozzle through a plurality of air passage holes formed in the nozzle in a form branched from the air passage. By generating an air flow (assist air) discharged from the air passage hole around the ions discharged from the ion generation chamber to the front of the nozzle, it becomes possible to fly the ions further away. The air flow (sheath air) that passes around the discharge needle has the effect of suppressing the deposition or adhesion of impurities on the electrode, but ions are less likely to be generated if the flow velocity of the air flow becomes too high. Become. For this reason, in the prior art document 1, the flow velocity or pressure of the air flow passing around the discharge needle is reduced by narrowing the flow path area between the air supply chamber and the ion generation chamber.

  In addition, a high pressure of compressed air supplied to the air supply chamber is applied to the discharge needle unit. For this reason, it is necessary to ensure airtightness between the discharge needle unit and the mounting hole of the main body case. Therefore, in the prior art document 1, an O-ring is attached to the holder of the discharge needle unit, and the discharge needle unit with the O-ring is inserted into the attachment hole, so that the gap between the discharge needle unit and the attachment hole of the main body case is reduced. To ensure airtightness. That is, the compressed air supplied to the air supply chamber is prevented from leaking outside through the gap between the outer peripheral surface of the holder of the discharge needle unit and the inner peripheral surface of the mounting hole.

JP 2004-228069 A

  The static eliminator of the prior art document 1 has a single discharge needle, but the applicant of the present application is examining a static eliminator that emits ions over a wider range by including a plurality of discharge needles. . Furthermore, the applicant of the present application is also considering the use of a configuration in which a plurality of discharge needles are attached and detached collectively from the viewpoint of convenience of discharge needle maintenance work.

  However, when this configuration is adopted, it is difficult to ensure the coaxiality between the plurality of discharge needle units and the mounting opening of the main body case into which the discharge needle units are respectively inserted. That is, due to a dimensional error at the time of design, a deviation occurs in the coaxiality between the discharge needle unit and the mounting hole. This deviation in coaxiality becomes more prominent as the number of discharge needle units is increased. When the coaxiality between the discharge needle unit and the mounting hole is ensured, the O-ring is suitably compressed in the radial direction so that a sealed state is suitably secured. However, since the compressed state of the O-ring becomes more uneven as the coaxiality is shifted, there is a possibility that airtightness cannot be ensured evenly over the entire circumference of the discharge needle unit.

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to achieve a concentricity between the discharge needles and their insertion ports when a plurality of discharge needles are collectively attached to the main body. Regardless, the object is to provide a static eliminator that can ensure airtightness between the discharge needle unit and the main body.

  According to the first aspect of the present invention, a discharge needle unit in which a discharge needle is held by a plurality of holding portions formed on a base and a plurality of insertion ports into which the holding portions are inserted are formed. A main body, and the discharge needle unit is detachably attached to the main body in such a manner that each holding portion is inserted into each insertion port, and each discharge needle is compressed air from the outside. In which the discharge needle unit is fixedly held with respect to the main body, and the holding state includes A holding mechanism that takes two states of the non-holding state to be released, and a single elastic member provided on the base or the main body in a form surrounding the entire periphery of the plurality of holding portions, or the plurality of holding portions. In an individually enclosed manner A plurality of elastic members provided on the base or the main body, and when the holding mechanism is changed from a non-holding state to a holding state with the discharge needle unit mounted on the main body, The one or more elastic members sandwiched between the portion and the base of the discharge needle unit are compressed in the insertion direction of the discharge needle unit, whereby the discharge needle unit is inserted into each insertion port. The gist is that the opening end opposite to the direction is sealed.

  According to the present invention, the single or plural elastic members sandwiched between the main body portion and the base of the discharge needle unit are compressed in the insertion direction of the discharge needle unit, so that the discharge needle at each insertion port. The open end opposite to the unit insertion direction is sealed. By adopting an elastic member that is compressed in the insertion direction of the discharge needle unit as a sealing device for each insertion opening of the main body, the deviation of the coaxiality between each discharge needle (or holding part) and each insertion opening is sealed. There is no significant impact on the condition. Therefore, when a plurality of discharge needles are collectively attached to the main body, airtightness between the discharge needle unit and the main body can be ensured regardless of the degree of coaxiality between the discharge needles and their insertion ports. .

  According to a second aspect of the present invention, in the static eliminator according to the first aspect of the present invention, an air flow path into which compressed air is introduced from the outside and a branch from the air flow path are provided inside the main body. A first branch channel that communicates with the ion emission port via a gap formed between the insertion port and each holding part, and a branch from the air channel and is formed around each ion emission port A second branch flow path communicating with the plurality of air outlets, and at a boundary portion between the air flow path and the first branch flow path, by providing a throttle portion of the flow path area, The gist is that the pressure of the air supplied to the first branch flow path is made smaller than the pressure of the air supplied to the air flow path.

  According to the present invention, the compressed air introduced into the air channel is guided to the ion emission port and the air blowing port via the first and second branch channels, respectively. For this reason, it is only necessary to provide one compressed air supply line from the outside to the main body. Although it is conceivable that the compressed air supply line from the outside to the main body is made to be two systems that communicate independently with the ion emission port and the air blowing port, respectively, the main body, and hence the physique of the static eliminator, can be compared to this case. Can be reduced in size.

  Further, the air pressure in the first branch flow path is smaller than the air pressure in the air flow path into which compressed air from the outside is introduced. For this reason, compared with the case where the air pressure in all the flow paths is made the same, the air pressure applied to the discharge needle unit (precisely, each holding portion) is also small. Therefore, the amount of compression of the elastic member can be reduced. Even in this case, the sealed state of each insertion port is preferably maintained.

  According to a third aspect of the present invention, in the static eliminator according to the first or second aspect, the holding mechanism includes a part of the discharge needle unit attached to the main body, and A slide holder that reciprocates along a direction in which the discharge needles are arranged, and the slide holder is engaged with a part of the main body portion in the removal direction of the discharge needle unit to be in the holding state; And the second position where the engagement with the part is released and the non-holding state is achieved.

  According to the present invention, when the slide holder is displaced from the second position to the first position, the elastic member is compressed to seal each insertion port. The elastic member is evenly compressed toward the insertion direction of the discharge needle unit via the base. For this reason, the opening edge part on the opposite side to the insertion direction of the discharge needle unit in each insertion opening is sealed equally without deviation. Also, the discharge needle unit can be attached and detached simply by sliding the slide holder along the direction in which the discharge needles are arranged.

  According to the present invention, when a plurality of discharge needles are collectively attached to the main body, airtightness between the discharge needle unit and the main body is ensured regardless of the degree of coaxiality between the discharge needles and their insertion ports. can do.

(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 principal part side sectional view of the main-body part which shows the aspect of compression of packing. The disassembled perspective view of the main-body part and discharge needle unit of the static elimination apparatus in other embodiment. (A), (b) is a disassembled perspective view of the main-body part and discharge needle unit of the static elimination apparatus in other embodiment. The schematic diagram which shows schematic structure of the static elimination apparatus in other embodiment.

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.

<Discharge needle unit>
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.

<Main body>
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. That is, the opening area of the small hole 41 a is set to be gradually smaller from the outside to the inside of the cylinder portion 41. The small hole 41a functions as a throttle portion of the flow path area.

  As shown in FIG. 2, four air holes 43 are formed around each cylindrical portion 41 on the inner bottom surface of the main body portion 12. 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 61 is provided at the end of the main body 12. A compressed air source is connected to the tube joint 61 via an air tube (not shown). The 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 61. A high voltage power supply (AC) (not shown) is connected to the end of the main body 12 opposite to the tube joint 61 via a power cable 62. The electric power from the high voltage power source is applied to the electrode 51 via the power cable 62.

<Attachment mode of discharge needle unit>
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.

<Air supply path>
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.

  A small hole 41a is formed in the boundary portion between the air flow channel 100 and the first branch flow channel 101 as a throttle portion of the flow channel area. For this reason, the air pressure supplied to the first branch flow path 101 is smaller than the pressure of the compressed air supplied to the air flow path 100. The air pressure supplied to the first branch flow path 101 acts on each holding portion 22 and eventually the discharge needle unit 13 in the direction of detachment. As a result, the compressed air from the outside is directly used as the first branch. Unlike the case of supplying to the flow path 101, the air pressure acting on the discharge needle unit 13 is small.

  Here, the air flow (sheath air) that passes around each discharge needle 23 has an effect of suppressing precipitation or adhesion of impurities to each discharge needle 23, but if the flow velocity of the air flow becomes too fast. Ions are less likely to be generated. In this regard, in this example, the flow area or the pressure of the air flow passing around the discharge needle 23 is reduced by narrowing the flow passage area between the air flow passage 100 and the first branch flow passage 101 by the small hole 41a. Is preferably reduced. For this reason, the generation | occurrence | production of ion is not inhibited by sheath air, and the generation efficiency of ion is maintained suitably.

  Incidentally, it is also conceivable to reduce the flow path area on the tip side of the discharge needle 23 in the first branch flow path 101. In this case, although the ion generation efficiency is maintained, the air pressure supplied to the first branch flow path 101 is approximately the same as the pressure of the compressed air supplied to the air flow path 100. The air pressure acting on the portion 22 and thus the discharge needle unit 13 becomes large. As the air pressure increases, the difficulty of sealing the first branch channel 101 (more precisely, the end of the insertion port 31 on the insertion side of the discharge needle 23) increases. In this example, since the air pressure in the first branch channel 101 is reduced, it is easy to ensure an airtight state.

<Holding mechanism>
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.

  The first position P1 is also a state in which the airtight state of the first branch channel 101 is ensured. That is, as shown in an enlarged view in the upper part of FIG. 3, the two engaging members 205 can be brought into contact with the inclined surface 35 of the engaging member 32. For this reason, as the slide holder 202 is displaced from the second position P <b> 2 to the first position P <b> 1, the distal end portion of the engaging member 205 comes into contact with the inclined surface 35. When the slide holder 202 is further displaced toward the second position P2, the distal end portion of the engaging member 205 is displaced toward the main body portion 12 side while being guided by the inclined surface 35. Along with this, the discharge needle unit 13 is gradually displaced toward the main body 12 side as shown by a two-dot chain line in FIG. 7, and the packing 27 attached to the holding portion 22 passes through the base 21. 12 is gradually compressed while being pressed against the upper surface of 12. Eventually, the engaging member 205 gets over the slope 35, and the upper surface of the engaging member 205 reaches the first position P1 while being in sliding contact with the lower surface of the protrusion 34. In this state, the packing 27 is sufficiently compressed, so that the airtight state of each first branch channel 101 is ensured. Further, the packing 27 is uniformly compressed in the insertion direction of the discharge needle unit 13 through the base 21. For this reason, the opening edge part on the opposite side to the insertion direction of the discharge needle unit in each insertion opening is sealed equally without deviation.

<Attaching / detaching the discharge needle unit>
Next, the attaching / detaching operation of the discharge needle unit will be described. The discharge needle unit 13 is removed from the main body 12 when the discharge needle 23 is maintained. In addition, the main-body part 12 is hold | maintained in the state fixed to the installation object.

  When removing the discharge needle unit 13, the slide holder 202 held at the first position P1 shown in FIG. 1 (b) is slid to the second position P2 shown in FIG. 1 (a). Let Thereby, the discharge needle unit 13 can be removed from the main body portion 12 by pulling it upward.

  After the maintenance is completed, the discharge needle unit 13 is mounted again on the main body 12 from above. The discharge needle unit 13 is fixedly held with respect to the main body 12 by sliding the slide holder 202 from the second position P2 to the first position P1. At the same time, airtightness of each insertion port 31 is also ensured.

Thus, the attaching / detaching work of the discharge needle unit 13 is completed. The same applies to the replacement of the discharge needle unit 13.
Thus, in this example, the attaching / detaching direction of the discharge needle unit 13 is opposite to the ion emission direction (downward in FIGS. 1A and 1B). For this reason, even when the ion emission port 42 of the main body 12 is used close to a work (charged body), the work does not get in the way when the discharge needle unit 13 is attached / detached. Can be performed smoothly.

<Operation of the static eliminator>
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.

<Effect of Embodiment>
Therefore, according to the present embodiment, the following effects can be obtained.
(1) By adopting a packing 27 that is compressed in the insertion direction of the discharge needle unit 13 as a sealing device for each insertion port 31 of the main body 12, each discharge needle 23 (or the holding portion 22) and each insertion port 31. The deviation of the coaxiality with the air does not greatly affect the sealed state. Therefore, when a plurality of discharge needles 23 are collectively attached to the main body portion 12, the airtightness between the discharge needle unit 13 and the main body portion 12 regardless of the coaxiality between the discharge needles 23 and their insertion ports 31. Can be secured.

  (2) Each insertion port 31 is individually sealed with a plurality of packings 27. Here, it is also possible to employ a single packing including each holding portion 22, but the thickness error tends to increase as the area of the packing increases. In this regard, according to the present example, a plurality of packings 27 are provided corresponding to each holding portion 22. Compared to the case where each insertion port 31 is sealed with a single packing, the area of each packing 27 is small, and the thickness error of each packing 27 is also reduced. Since the thickness of each packing 27 is uniform, the compression amount of the packing 27 required to obtain a sealed state is also uniform. Therefore, the design of the holding mechanism 201 that sandwiches each packing 27 with the main body 12 is also simplified.

  (3) The compressed air introduced into the air flow channel 100 is guided to the ion emission port 42 and the air blowing port 44 via the first and second branch flow channels 101 and 102, respectively. For this reason, it is only necessary to provide one compressed air supply line from the outside to the main body 12. Although it can be considered that the compressed air supply line from the outside to the main body part 12 is two systems communicating independently with the ion emission port 42 and the air blowing port 44 respectively, the main body part 12, by extension, is compared with this case. The size of the static eliminator 11 can be reduced.

  (4) Moreover, the air pressure in the 1st branch flow path 101 becomes smaller than the air pressure in the air flow path 100 into which the compressed air from the outside is introduced. For this reason, compared with the case where the air pressure in all the flow paths is made the same, the air pressure applied with respect to the discharge needle unit 13 (precisely each holding | maintenance part 22) also becomes a small thing. Therefore, the compression amount of each packing 27 can be reduced. Even in this case, the sealed state of each insertion port 31 is preferably maintained. In addition, even if the holding state by the slide holder 202 is released for some reason, the discharge needle unit 13 is difficult to drop off from the main body 12. Further, since the force for pressing the packing 27 against the main body 12 side can also be reduced, a simple slide-type configuration can be adopted as the holding mechanism for the discharge needle unit 13.

  (5) By simply sliding the slide holder 202 from the second position P2 to the first position P1, each packing 27 is compressed and each insertion port 31 is sealed. For this reason, the mounting operation of the discharge needle unit 13 is simplified. Further, since the packing 27 is uniformly compressed in the insertion direction of the discharge needle unit 13 via the base 21, the opening end on the opposite side to the insertion direction of the discharge needle unit 13 in each insertion port 31 is Sealed evenly without displacement.

  (6) The direction in which the discharge needle unit 13 is attached to and detached from the main body 12 is set to be opposite to the ion emission direction. For this reason, the space on the opposite side to the ion emission direction can be effectively used as a space for attaching and detaching the discharge needle unit 13. That is, if the installation space for the static eliminator 11 can be secured, the space for attaching and detaching the discharge needle unit 13 can also be secured, so that the degree of freedom in installing the static eliminator 11 is increased.

  (7) In some cases, it is desired to use the ion emission port 42 of the main body 12 close to the work (charged body). In this respect, in this example, since the attaching / detaching direction of the discharge needle unit 13 is opposite to the ion emission, the work is not obstructed when attaching / detaching the discharge needle unit 13, and the attaching / detaching of the discharge needle unit 13 is performed. Can be done easily.

  (8) Each discharge needle 23 is connected to the electrode 51 in a conductive state simply by attaching the discharge needle unit 13 to the main body 12. For this reason, it is not necessary to separately mount the discharge needle unit 13 on the main body 12 and connect the discharge needles 23 and the electrodes 51, so that the mounting operation of the discharge needle unit 13 is simplified.

  (9) Each discharge needle 23 is connected to the electrode 51 via the conical coil spring 24. The conical coil spring 24 is maintained in an elastic contact with the electrode 51. For this reason, the contact pressure with respect to the electrode 51 of each conical coil spring 24 is ensured suitably. As a result, the electrical connection state between each discharge needle 23 and the electrode 51 is suitably maintained.

  (10) The insertion depth of the discharge needle 23 is positioned only by inserting the discharge needle 23 to a position where the base 21 comes into contact with the main body portion 12. For this reason, the mounting operation of the discharge needle unit 13 is simplified.

  (11) A first position P1 that engages with the engaging member 32 that is a part of the main body 12 in the direction in which the discharge needle unit 13 is removed, and a second position that releases the engagement with the engaging member 205. A slide holder 202 that is displaced between P2 is provided. For this reason, the discharge needle unit 13 can be attached and detached simply by operating the slide holder 202 without using a tool or the like.

<Other embodiments>
The embodiment described above may be modified as follows.
In this example, the discharge needles 23 are arranged in a straight line, but the arrangement of the discharge needles 23 may be changed as appropriate. For example, the discharge needles 23 may be arranged in a plurality of rows or in a staggered manner.

In this example, compressed air is supplied to the inside of the main body 12, but other gases such as nitrogen gas may be supplied.
-The number of discharge needles required varies depending on the installation location of the static eliminator 11 or product specifications. In this case, although it is conceivable to prepare the dedicated discharge needle unit 13 and the main body portion 12 according to the required number of discharge needles, it is preferable that the number of types of parts is small from the viewpoint of management cost and the like. Based on this viewpoint, the following configuration may be adopted. That is, as shown in FIG. 8, an insertion opening that is a natural number times the number of discharge needles 23 of the discharge needle unit 13 is formed in the main body portion 12. Then, the natural number of discharge needle units 13 are respectively attached to the main body 12. According to this configuration, if the required number of discharge needles 23 is a natural number multiple of the number of discharge needles 23 included in the discharge needle unit 13, it can be handled by combining a plurality of discharge needle units 13. is there. For example, when the number of discharge needles of the discharge needle unit 13 is four and the number of required discharge needles 23 is eight, the main body portion 12 having eight insertion ports 31 is prepared. In contrast, two discharge needle units 13 may be attached. In this way, it is not necessary to prepare a dedicated discharge needle unit 13 corresponding to the number of required discharge needles, which contributes to a reduction in component management costs and the like.

  In this example, a plurality of packings 27 are provided, and each insertion port 31 of the main body 12 is individually sealed. However, as shown in FIG. You may make it seal each insertion port 31 of the main-body part 12 collectively by the flat packing 301. FIG. In this way, since a single packing is prepared, the number of parts is reduced. Further, as shown in FIG. 9B, an annular packing 302 that surrounds the entire plurality of holding portions 22 may be provided on the lower surface of the base 21. Even in this case, the packing 302 is compressed in such a manner as to be pressed against the upper surface of the main body 12 by sliding the slide holder 202 from the second position P2 to the first position P1. As a result, airtightness between the main body portion 12 and the base 21 and thus airtightness inside and outside each insertion port 31 is ensured. The packing 302 can be replaced with an O-ring. In the mounting direction of the discharge needle unit 13 with respect to the main body 12, the O-ring is compressed, whereby the airtightness of each insertion port 31 can be ensured.

In this example, the packings 27, 301, 302 are provided on the discharge needle unit 13, but may be provided on the upper surface of the main body 12.
In this example, the compressed air supplied to the air flow path 100 is branched into the first and second branch flow paths 101 and 102, but the supply paths for the sheath air and the assist air may be provided independently. . That is, as shown in FIG. 10, the first and second air flow paths 401 and 402 are provided inside the main body 12. The first air flow path 401 guides the air introduced from the outside to the ion emission port 42 in such a manner as to pass around the discharge needles 23. The second air flow path 402 guides air introduced from the outside to the air blowing port 44 formed around each ion emission port 42. However, the air pressure supplied to the first air flow path 401 is set smaller than the pressure of the air supplied to the second air flow path 402.

  In addition, these 1st and 2nd air flow paths 401 and 402 are the inside of the air flow path 100, for example in the part in which each ventilation hole 43 opens, and the part in which the small hole 41a of each cylinder part 41 opens. It is also possible to form by partitioning. And compressed air is supplied separately with respect to these divided parts. In such a case, even if the pressure of the compressed air supplied to the first and second air flow paths 401 and 402 is the same, the pressure around each discharge needle 23 is reduced by a small hole 41a. Reduced air is supplied.

  In this example, the slide holder 202 may be displaced between the first position P <b> 1 and the second position P <b> 2 within the range of the contour of the main body 12. For example, as shown in FIG. 1A, the length of the slide holder 202 is shortened to such an extent that it does not protrude from both ends of the main body 12 when it is displaced from the first position P1 to the second position P2. To do. In this way, it is not necessary to secure a space for the slide holder 202 to escape, so that the installation space for the static elimination device 11 can be saved.

In this example, the conical coil spring 24 is employed as the conductive member that connects each discharge needle 23 and the electrode 51, but an elastic member such as a leaf spring may be employed.
-In this example, although the alternating current system was employ | adopted as the system which generates ion for the static elimination apparatus 11, you may employ | adopt a direct current system. The direct current method is a method in which a direct current voltage is applied to the discharge needle 23 to generate corona discharge to generate only positive or negative ions.

  -Each holding part 22 may be omitted. That is, each discharge needle 23 is provided directly on the lower surface of the base 21. In this way, the opening area of the insertion port 31 can be made smaller than when the holding portion 22 is inserted into the insertion port 31. The opening end of the insertion port 31 can be easily sealed. In this case, a gap (each insertion port 31) between each discharge needle 23 and the inner peripheral surface of each tube portion 41 constitutes the first branch channel 101.

<Other technical ideas>
Next, the technical idea that can be grasped from the above embodiment will be added below.
(A) In the static eliminator according to claim 1, the first air that guides the compressed air introduced from the outside to the ion emission port in a manner of passing around the discharge needles inside the main body. A flow path and a second air flow path that guides compressed air introduced from the outside to a plurality of air blowing ports formed around each of the ion emission ports, and supplies the second air flow path to the first air flow path The static eliminator in which the pressure of the air to be set is set smaller than the pressure of the air supplied to the second air flow path.

  According to this configuration, the air pressure in the first air flow path is smaller than the air pressure in the second air flow path. For this reason, compared with the case where the air pressure in the 1st and 2nd air flow path is made the same, the air pressure applied with respect to a discharge needle unit (precisely each holding | maintenance part) becomes a small thing. . Therefore, the amount of compression of the elastic member can be reduced. Even in this case, the sealed state of each insertion port is preferably maintained.

  (B) In the static eliminator according to any one of claims 1 to 4, the plurality of holding members as a plurality of elastic members provided on the base in a mode of individually surrounding the plurality of holding units. A static eliminator in which a plurality of packings each penetrating through the part are employed. For example, a packing can be used as the sealing device for the insertion opening.

  (C) a discharge needle unit in which a plurality of discharge needles are held with respect to a base; and a main body portion in which a plurality of insertion ports into which the discharge needles are inserted are formed, and the discharge needle unit Is attached to the main body in a manner that the discharge needles are inserted into the insertion ports, and the discharge needles are connected to the plurality of ion emission ports into which compressed air from the outside is introduced. The static eliminator is inserted through each insertion port, and takes two states: a holding state in which the discharge needle unit is fixedly held with respect to the main body, and a non-holding state in which the holding state is released. A holding mechanism and a single or a plurality of elastic members provided on the base in a manner that surrounds the entire periphery of the plurality of discharge needles or in a manner that surrounds the discharge needles individually, Equipped with a discharge needle unit When the holding mechanism is changed from the non-holding state to the holding state, the elastic member or members sandwiched between the main body portion and the base of the discharge needle unit is the discharge needle unit. The static elimination apparatus by which the opening edge part on the opposite side to the insertion direction of the said discharge needle unit in each said insertion port is sealed by being compressed in the insertion direction. According to this configuration, an effect similar to that of the first aspect can be obtained.

  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 ... air outlet, 100 ... air channel, 101 ... first branch channel, 102 ... second branch channel, 201 ... holding mechanism, 202 ... slide holder, 401 ... 1st air flow path, 402 ... 2nd air flow path.

Claims (3)

A discharge needle unit in which a discharge needle is held in each of a plurality of holding portions formed on a base;
A main body formed with a plurality of insertion openings into which the holding portions are inserted, and
The discharge needle unit is detachably attached to the main body in such a manner that the holding portions are inserted into the insertion ports, and each discharge needle has a plurality of ions into which compressed air from the outside is introduced. A static eliminator inserted into the discharge port through each of the insertion ports,
A holding mechanism that takes two states, a holding state in which the discharge needle unit is fixedly held with respect to the main body and a non-holding state in which the holding state is released;
A single elastic member provided on the base or the main body in a form surrounding the entire periphery of the plurality of holding parts, or provided on the base or the main body in a form surrounding the plurality of holding parts individually. A plurality of elastic members,
When the holding mechanism is changed from the non-holding state to the holding state when the discharge needle unit is mounted on the main body, the singular or the nip sandwiched between the main body and the base of the discharge needle unit The static eliminator which seals the opening edge part on the opposite side to the insertion direction of the said discharge needle unit in each said insertion port by compressing a some elastic member in the insertion direction of the said discharge needle unit. The static eliminator according to claim 1,
Inside the main body portion, an air flow path through which compressed air is introduced from the outside,
A first branch channel that branches from the air channel and communicates with the ion emission port via a gap formed between each insertion port and each holding unit;
A second branch flow path that branches from the air flow path and communicates with a plurality of blower openings formed around each of the ion emission openings; and
By providing a throttle portion having a flow path area at a boundary portion between the air flow path and the first branch flow path, the pressure of the air supplied to the first branch flow path is changed to the air flow path. The static eliminator is made smaller than the pressure of the air supplied to the air. In the static elimination apparatus of Claim 1 or Claim 2,
The holding mechanism includes a slide holder that reciprocates along the direction in which the discharge needles are arranged in a manner that includes a part of the discharge needle unit attached to the main body, and
The slide holder is engaged with a part of the main body part in the removing direction of the discharge needle unit to be in the holding state, and the engagement with respect to the part is released to be in the non-holding state. A static eliminator that displaces between the second position.

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