JP5292820B2 - Static eliminator - Google Patents

Abstract

The invention provides an electrostatic removal device which is low in cost and easy for maintaince. The electrostatic removal device (10) comprises a fan (12); a discharge needle (13), arranged on the periphery of the transported wind, for endowing scheduled ions for wind; a ring sensor electrode (14), arranged in an access of the wind along the cirumferential of the access endowed with ions; a control part, based on the electric potential detected by the sensor electrode (14), for controlling the high voltage applied to the discharge needle (13).

Description

  The present invention relates to a static eliminator, and more particularly to a static eliminator that is inexpensive and easy to maintain.

  Conventional static eliminating devices are disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2007-123167 (Patent Document 1) and Japanese Unexamined Patent Application Publication No. 2004-253192 (Patent Document 2). FIG. 11 is a perspective view (A) showing the static eliminator 100 disclosed in Patent Document 1 and a view (B) during maintenance. Referring to FIG. 11, the static eliminator 100 includes a fan 101 that blows air toward an object to be neutralized, a discharge needle 102 that imparts ions for static elimination to the wind, and an ion balance of the wind to which the ions have been imparted. Sensor electrode 103 for detecting. Here, the sensor electrode 103 includes a concentric portion that covers from the rotation center to the outer peripheral portion of the fan 101 and a lattice portion that is provided vertically and horizontally, and has a structure that also serves as a lattice for preventing electric shock.

  FIG. 12 is a perspective view (A) showing the static eliminator 110 disclosed in Patent Document 2 and a view (B) during maintenance. Referring to FIG. 12, this static eliminator 110 also includes a fan 111 that blows air toward an object to be discharged, a discharge needle 112 for applying ions for discharging to the wind, and ions of the wind to which ions have been applied. And a sensor electrode 113 for detecting the balance. The sensor electrode 113 includes a ring-shaped portion provided in the central portion of the fan 101 and a lattice portion provided vertically and horizontally, and has a structure that also serves as a grid for preventing electric shock.

In the static eliminators 100 and 110, when the discharge needles 102 and 112 discharge ions for a long time, dust adheres to the needle tips and inhibits the generation of ions, so it is necessary to periodically clean the needles. Therefore, since it is necessary to access the discharge needle during maintenance, the above-described configuration is necessary.
JP 2007-123167 A (FIGS. 5 and 6 and descriptions related thereto) JP 2004-253192 A (FIGS. 5 and 6 and descriptions related thereto)

  The conventional static eliminating device is configured as described above. At the time of maintenance, as shown in FIG. 11B, it is possible to open the cover 104 from the casing 106 in the direction indicated by the arrow in the figure to access the discharge needle 102. However, since the sensor electrode 103 is electrically connected to the substrate, it is not possible to remove only the sensor electrode 103. Further, in this static eliminator, if the cover 104 is left open for maintenance, the cover 104 may move in the direction of closing (the direction opposite to the arrow), so that it does not close without permission. In addition, lock members 105 are provided on both sides of the cover 104. In addition, the casing 106 needs to have a shape that fits with the lock member 105, and there is a problem that the mold structure of the cover 104 and the casing 106 is complicated.

  Referring to FIG. 12B, in another conventional static eliminator, the discharge needle unit 114 including the discharge needle 112 is formed in a cassette shape during maintenance, and the discharge needle unit 114 is arranged in the direction of the arrow shown in the figure. It has a shape that can be taken out from the main body 115 having the sensor electrode 113. However, in order to make the discharge needle unit 114 into a cassette shape that can be taken out, it is necessary to add a cassette-shaped discharge needle unit 114, which uses an expensive connector that can withstand high voltages, or a unit to avoid it. There was a problem that it was necessary to incorporate a high-voltage power supply inside, resulting in an increase in cost.

  As a result, the conventional static eliminator has a problem of increasing the cost in order to facilitate maintenance.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a static eliminating device that is inexpensive and easy to maintain.

  The static eliminator according to the present invention is provided with a fan, a discharge needle for applying predetermined ions to the wind, and a high voltage unit for applying a high voltage to the discharge needle. A sensor electrode for detecting ions applied to the wind by means of an integral conductor mechanically and electrically connected at a position surrounding the air passage to which the ions are applied in the ventilation path, and a sensor And a control unit for controlling the high voltage unit based on the detection result of the electrodes.

  Preferably, the sensor electrode is composed of a single line.

More preferably, the sensor electrode has a ring shape.
4. The static eliminator according to claim 1, wherein the discharge needle includes a plurality of pairs of positive and negative discharge needles.

  In one embodiment of the present invention, the tips of the plurality of pairs of discharge needles are arranged along the ring shape of the sensor electrode.

  Further, the plurality of pairs of discharge needles are preferably provided so as to be rotationally symmetrical or symmetrical about the rotational center of the fan.

  Further, the sensor electrode and the plurality of pairs of discharge needles may be integrally held by a cylindrical holder, or the sensor electrode may have a protrusion protruding in the radial direction at a part of the ring shape.

  The sensor electrode preferably includes a ring and a ring-shaped member that is held by the ring and provided along the ring inside the ring. The ring-shaped member preferably includes a plurality of arc-shaped portions that are discontinuous with each other.

  The sensor electrode preferably has an end portion for taking out the electric potential accumulated in the sensor electrode, and a terminal is preferably provided at the end portion.

  In the static eliminator according to the present invention, since the sensor electrode for sending the feedback signal to the high voltage part is provided so as to surround the wind passage, the sensor electrode can be easily attached and detached, and is complicated as in the conventional case. Does not require configuration.

  As a result, a static eliminating device that is inexpensive and easy to maintain can be provided.

    Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an overall configuration of a static eliminating device 10 according to an embodiment of the present invention. Referring to FIG. 1, a static eliminator 10 according to this embodiment has a fan for blowing air inside, and discharges air by blowing an ion-charged air onto an object 90 placed on the front surface thereof. To do. This ion for static elimination is generated by generating a positive / negative ion by applying a high voltage to the positive / negative discharge needle.

  FIG. 2 is a front view of the static eliminator 10. (A) is a figure which shows the state to which the cover 15 which has a grid | lattice-like crosspiece is attached in order to prevent the contact to the fan 12 and the discharge needle | hook which requires a high voltage in a normal use state. In addition to preventing contact, the cover 15 has a function of controlling the wind direction.

  Referring to FIG. 2A, the static eliminator 10 includes a case 11, a blower unit including a fan 12 provided at the upper center of the case 11, an operation switch provided at the lower part of the blower unit, and the like. And an operation unit 20 provided. The case 11 is supported by a U-shaped stand 18 by support portions 16a and 16b provided on both sides thereof. The U-shaped stand 18 is provided with a through hole, and the support portions 16a and 16b are provided with screw holes. The case 11 is supported by the stand 18 so as to be rotatable about the axis of the knob 17 by the knobs 17a and 17b each having a shaft provided with a screw that engages with the screw holes of the support portions 16a and 16b of the case 11. The

  FIG. 2B is a diagram showing a state in which the cover 15 is removed for maintenance. Three sets of +/- discharge needles 13 are alternately arranged in a circumferential shape, for a total of six. The sensor electrode 14 is arranged concentrically with the circumference formed by the tip of the discharge needle 13 slightly outside the discharge needle 13. As shown in FIG. 4 later, since the sensor electrode 14 is disposed outside the discharge needle 13, the discharge needle 13 can be seen directly when the cover 15 is removed, so that the operator can easily clean the discharge needle 13. Or exchangeable.

  FIG. 3 is a perspective view of the static eliminator 10 with the cover 15 opened. When the cover 15 is removed, the holder 21 is exposed. The cover 15 can be easily removed by using a snap fit (not shown) provided on the upper portion of the case 11 and can be easily maintained. Compared to the conventional example, parts other than the cover 15 and the case 11 are not required, and since there is no bearing structure, the mold structure can be simplified.

  FIG. 4 is a diagram illustrating a state in which the holder 21 is taken out, and is a diagram illustrating a positional relationship between the discharge needle 13 and the sensor electrode 14 attached to the holder 21. Referring to FIG. 4, the holder 21 has a shape in which a cylindrical projection 21b is provided on a rectangular plate 21a. A rectangular plate 21a is attached to the fan 12 having a rectangular frame as a whole as will be described later.

  The discharge needles 13 are provided at equal intervals from each other at the bottom of the cylindrical protrusion 21b (in the vicinity of the plate 21a). Specifically, sockets 36a, 36b,... For holding ends opposite to the needle tips are provided at the mounting position of the discharge needle 13, and these sockets 36a, 36b,. Connected to the high voltage section shown. The sensor electrode 14 is attached to the top of the cylindrical projection 21b (near the end in the direction away from the plate 21a) using a snap fit (not shown).

  It is desirable that the discharge needles 13 be evenly arranged at the position where the fan 12 has the fastest wind speed. Here, since the axial flow fan is used, the outer peripheral portion of the wind is the fastest, and therefore, the outer peripheral portion surrounding the wind passage is arranged in a ring shape. The sensor electrode 14 is set in a shape that can most efficiently detect ions generated by the discharge needle 13. In this example, the circumference formed by the plurality of discharge needles 13 is 100 mm in diameter, and is slightly larger in diameter than 108 mm.

  A plurality of discharge needles 13 each forming a pair are provided in a circumferential shape, and the sensor electrode 14 is also provided at a position surrounding the air passage to which ions are applied in the air passage, and mechanically and electrically. Since it is formed in a ring shape by the connected integral conductor, even if the sensor electrode 14 is decentered with respect to the discharge needle 13, it is canceled out in the decentered direction. The problem is less likely to occur.

FIG. 5 is an exploded perspective view showing the overall configuration of the static eliminator 10 according to this embodiment. With reference to FIG. 5, the static eliminator 10 includes a cover 15, a discharge needle 13, a front case 11 a, a holder 21, a fan 12, a rear case 11 b, and a filter 34 in order from the front. The filter 34 includes a concentric filter 34a, a filter 34b made of a rectangular nonwoven fabric and the like, and a radial filter 34c. The concentric filter 34a and the radial filter 34c are made of resin. The resin filter is used because there is a problem that ions are accumulated when a conductive material is used, and the cost is reduced.
The front case 11 a and the rear case 11 b are integrated by a screw 33 to form the case 11. The holder 21, the fan 12, and the filter 34a are integrated by a screw 35. A control circuit for controlling the static eliminator 10 is provided in the rear case 11b, and is connected to the operation unit 20 provided in the front case 11a by an inter-board harness 22.

  Further, a display substrate (not shown) for the operation unit 20 is provided on the front case 11a, and a main substrate 37 serving as a control circuit is provided on the rear case 11b.

  Next, a circuit for performing feedback control of the static eliminator 10 according to this embodiment will be described. FIG. 6 is a circuit block diagram of the static eliminator 10. Referring to FIG. 6, the static eliminator 10 includes an AC adapter 41 that supplies power, a power switch 42 connected to the AC adapter 41, and a fan controller 44 that controls the fan 12 connected to the power switch 42. Including. The fan control unit 44 is connected with an adjustment volume VR45 for adjusting the air volume.

  The power switch 42 is further connected to a ground terminal 43, a fixed voltage unit 46 (positive side), and a voltage conversion circuit 47 (negative side). In this embodiment, the positive electrode voltage is fixed, and the feedback result is adjusted to maintain the ion balance by adjusting the negative electrode voltage.

  The fixed voltage unit 46 is connected to a discharge needle 13a for applying positive ions through a transformer 48a and a high voltage circuit 49a. The voltage conversion circuit 47 for feedback is connected to the discharge needle 13b for applying negative ions through the high voltage unit 50. The high voltage unit 50 includes a transformer 48b and a high voltage circuit 49b.

  Since there is a limit to the voltage adjustment range of the negative electrode for feedback, cleaning is performed when the comparison circuit 54 and the comparison circuit 54 detect a predetermined input voltage variation in order to monitor the input voltage variation of the negative high voltage unit 50. A cleaning warning display unit 55 for displaying a warning is provided. The comparison circuit 54 has upper and lower threshold values that define the range of the input voltage to the high voltage unit 50.

  An abnormality detection circuit 52 is provided to monitor the input voltage to the positive and negative transformers 48a and 48b. Here, the high pressure abnormality display portion 53 is displayed in red, and the cleaning warning display portion 55 is displayed in orange.

  With the above configuration, the degree of ionization of the wind generated by the fan 12 and ionized by the discharge from the discharge needle 13 is detected by the sensor electrode 14, and the detection signal is fed back to the voltage conversion circuit 47 via the sensor circuit 51. The

  Next, feedback control according to the degree of ionization of the wind ionized by the discharge from the discharge needle 13 will be described. FIG. 7 is a diagram for explaining this feedback control.

  The sensor electrode 14 receives both positive ions and negative ions at the same electrode, and is amplified by the sensor circuit 51 and fed back to the negative electrode voltage conversion circuit 47 when either one of the ions is large. By repeating this, the ion balance is maintained.

  Referring to FIG. 7, the degree of ionization of the wind ionized positively and negatively by corona discharge by the discharge needle 13 with respect to the wind generated by the fan is detected by the sensor electrode 14. It is determined whether the entire wind is ionized with a good balance. Specifically, this is performed by detecting the potential of the sensor electrode 14. The detection result is sent to the voltage conversion circuit 47. A signal from the voltage conversion circuit 47 is sent to the high voltage unit 50. The high voltage unit 50 includes a transformer driving unit 48a and a high voltage circuit 49b. The discharge needle 13 is discharged by a signal from the high voltage circuit 49b, and the ion balance is controlled to be appropriate. That is, based on the detection result of the sensor electrode 14, the high voltage unit 50 is controlled by the sensor circuit 51 and the voltage conversion circuit 47. Therefore, the sensor circuit 51 and the voltage conversion circuit 47 function as a control unit.

  Next, the sensor electrode 14 will be described. FIG. 8 is a perspective view showing the sensor electrode 14. (A) is a figure before providing a terminal, (B) is a figure which shows the state which provided the terminal. In this embodiment, the sensor electrode 14 has a ring-shaped sensor portion 14a, and the sensor portion 14a is formed by bending a steel wire or a mild steel wire. Further, both ends generated by forming the central portion of the wire in a ring shape are connected and welded to form an extraction portion 14b for taking out the potential accumulated in the sensor electrode 14.

  Since the sensor electrode 14 is processed with a single strand, there is no variation between the strands when receiving ions, and the fabrication is simple and can be performed at low cost. In order for the sensor electrode 14 to function, it is necessary to be electrically connected to a substrate (not shown). However, since the ionic current flowing through the sensor electrode 14 is as small as several μA, the influence of the contact resistance when connected by a connector or the like. The ion balance may become unstable.

  Therefore, it is desirable that electrical connection between the sensor electrode 14 and the substrate provided in the sensor circuit 51 is a method in which variation in connection resistance is reduced, such as soldering.

  Further, since the sensor electrode 14 detects a current of about several μA as described above, it is necessary to suppress fluctuations in the conductor resistance due to rust and surface plating alteration. Therefore, a material that is not easily affected by the environment such as stainless steel (SUS) is desirable.

  However, since SUS cannot be soldered basically, in order to suppress variations in contact resistance while using SUS, in this embodiment, as shown in FIG. 8B, a crimp terminal 14c is attached to the tip of SUS, The wire constituting the crimp terminal 14c and the sensor portion is soldered and connected to a substrate (not shown). Thereby, electrical connection with the board | substrate of the sensor electrode 14 is possible simply and cheaply, suppressing the variation in contact resistance.

  Next, another example of the sensor electrode will be described. FIG. 9 is a diagram showing another example of the sensor electrode. In this example, the sensor electrode 24 has a ring-shaped sensor portion 24a as a whole, and six projecting portions 24b projecting in a radial direction provided at equal intervals on the circumference, and a part thereof A terminal mounting portion 24c similar to that described in FIG. 8 is provided.

  The protruding portion 24 b is a clamp portion for attaching the sensor electrode 24 to the holder 21.

  In this manner, the ring radius is set large in the cramped portion with the holder 21 and the ring radius is set small (in a position where ions can be easily acquired) around the discharge needle 13. In this shape, while the ion acquisition is performed at an optimal position, the clamp portion is on the outer periphery, so that the clamp member provided in the holder 21 can be minimized, and the area that blocks the wind generated by the fan 12 can be reduced. Can be minimized. A state where the sensor electrode 24 is attached to the holder 21 is shown in FIG. As shown in FIG. 9B, six snap fits are provided in the vicinity of the upper end of the cylindrical portion of the holder 21 to hold the six protrusions 24b provided on the sensor electrode 24. .

  Next, another example of the sensor electrode will be described. FIG. 10 is a perspective view showing another example of the sensor electrode. Referring to FIG. 10, sensor electrode 26 includes a ring 26 a held by a holder, and three ring-shaped members (arc-shaped portions) 26 b having different diameters provided inside thereof with a space therebetween. Including. The three ring-shaped members 26b are connected to the ring 26a by connection portions 26c provided at both ends of each ring-shaped member 26b.

  Here, the sensor electrode 26 has one ring-shaped part and three incomplete ring-shaped parts connected to the ring-shaped part. However, the present invention is not limited to this. And may be connected to each other, or may be triple or more.

  Further, in the above-described embodiment, in the feedback control, the configuration in which the positive electrode voltage is fixed and the negative electrode voltage is adjusted to maintain the ion balance has been described. However, the configuration is not limited to this, and the reverse configuration may be used. .

  In the above embodiment, the case where the processing of the feedback signal from the sensor electrode is performed using the voltage is described, but the present invention is not limited thereto, and a current or the like may be used.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

1 is a perspective view showing an overall configuration of a static eliminating device according to an embodiment of the present invention. It is a front view of a static eliminating device. It is a perspective view which shows the state at the time of the maintenance of an electrostatic removal apparatus. It is a figure which shows the state in which the sensor electrode and the discharge needle were attached to the holder. It is a disassembled perspective view of a static eliminating device. It is a block diagram of a static eliminating device. It is a figure which shows the feedback process in an electrostatic removal apparatus. It is a figure which shows one Embodiment of a sensor electrode. It is a figure which shows other embodiment of a sensor electrode. It is a figure which shows other embodiment of a sensor electrode. It is a figure which shows the conventional static eliminating device. It is a figure which shows the conventional static eliminating device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Static electricity removal apparatus, 11 Case, 12 Air blower, 13 Discharge needle, 14, 24, 26 Sensor electrode, 15 Cover, 16 Support part, 17 knob, 18 Stand, 21 Holder, 22 Inter-board harness, 34 Filter.

Claims (8)

With fans,
A discharge needle provided at an outer peripheral portion in a ventilation passage of the wind sent by the fan and imparting predetermined ions to the wind;
A high voltage portion for applying a high voltage to the discharge needle;
A sensor electrode for detecting ions applied to the wind by an integral conductor mechanically and electrically provided at a position surrounding the air passage to which the ions are applied in the ventilation path;
A control unit for controlling the high voltage unit based on a detection result of the sensor electrode,
The sensor electrode has a ring shape composed of a single wire,
The sensor electrode is a static eliminator having a ring-shaped part protruding in a radial direction . The static eliminator according to claim 1, wherein the discharge needle includes a plurality of pairs of discharge needles in which positive and negative are paired. The static eliminator according to claim 2, wherein tips of the plurality of pairs of discharge needles are arranged along a ring shape of the sensor electrode. The electrostatic discharge device according to claim 2, wherein the discharge needle is provided rotationally symmetric or centrally symmetric with respect to the rotation center of the fan. 5. The static eliminator according to claim 2, wherein the sensor electrode and the plurality of pairs of discharge needles are integrally held by a cylindrical holder. The static eliminator according to claim 1, wherein the sensor electrode includes a ring and a ring-shaped member that is held by the ring and provided along the ring inside the ring. The static eliminating device according to claim 6 , wherein the ring-shaped member includes a plurality of arc-shaped portions that are discontinuous with each other. Said sensor electrode has an end portion for taking out the potential accumulated in the sensor electrode, the said end terminals are provided, the static electricity removing device according to any one of claims 1 to 7.

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