JP2008251406A - Nozzle injection type static eliminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nozzle injection type static eliminator capable of simply eliminating a delicate variation of imbalance. <P>SOLUTION: An earth ring 10 being a metal ring is arranged on a nozzle mounting part 7 in order to connect an earth electrode 14 on a nozzle 13 side to the ground, and the nozzle 13 is mounted to the nozzle mounting part 7 by interposing an insulation washer 17 between the earth ring 10 and the rear end of the nozzle 13, whereby the earth electrode 14 is electrically connected to the earth ring 10 through the insulation washer 17. The earth electrode 14 is connected to the ground through capacitance by the insulation washer 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a nozzle injection type static eliminator that discharges ions generated by discharge together with a gas such as air from a nozzle.

  The present applicant, as known in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-319358) and the like as this type of static eliminator, is a cap-shaped insulating material nozzle attached to the nozzle mounting portion of the static eliminator body. The discharge needle, which is a needle-like discharge electrode, is encapsulated, and a high voltage is applied to the discharge needle from the high-voltage power supply in the static eliminator body, and the nozzle is discharged from the nozzle-side earth electrode, which is the base. Has already provided a nozzle injection type static eliminator that injects gas from the nozzle.

  In this conventional device, the ground electrode is connected by directly pressing the rear end (outer end) of the ground electrode, which is the nozzle base, to the ground ring, which is a metal ring provided in the nozzle mounting portion of the static eliminator body. It was electrically connected to the earth ring on the static eliminator body.

  In addition, an electrostatic capacitance due to an insulating member is interposed between the discharge needle and the ground electrode, which is a base, and a capacitor element is connected between the ground electrode and the ground to achieve positive / negative ion balance. It was.

However, subtle variations in ion balance (unbalance that changes slightly) could not be resolved.
JP 2004-319358 A

  An object of the present invention is to provide a nozzle injection type static eliminator that can easily eliminate subtle fluctuations in ion balance, which could not be avoided even with the above-described structure.

  The present invention (invention according to claim 1) includes a discharge needle, which is a needle-like discharge electrode, in a cap-shaped insulating nozzle attached to the nozzle mounting portion of the static eliminator body, and the discharge needle is removed. In a nozzle injection type static eliminator that injects gas from the nozzle while applying a high voltage from a high voltage power supply in the main body of the electric device and discharging it from the nozzle side ground electrode, which is a base, the nozzle side ground electrode is grounded. In order to connect, an earth ring, which is a metal ring, is provided in the nozzle attachment portion, and an earth washer is attached to the nozzle attachment portion with an insulating washer interposed between the earth ring and the rear end of the nozzle. It is electrically connected to the earth ring through an insulating washer.

  In the invention according to claim 2, which is a preferred specific form, the nozzle mounting portion projects from the front surface of the static eliminator main body into a cylindrical shape, a male screw is formed on the outer periphery thereof, and the earth ring is formed on the outer periphery of the nozzle mounting portion. At the base end of the static eliminator main body, the discharge needle is implanted in the front surface of the static eliminator main body in the nozzle mounting portion, and the nozzle-side ground electrode is provided in a cylindrical shape on the inner periphery of the nozzle. A female screw is formed on the inner periphery of the ground electrode to be screwed with the male screw of the nozzle mounting portion. By screwing the male screw and the female screw and tightening the nozzle to the nozzle mounting portion, the insulating washer is grounded to the rear end of the ground electrode. It is designed to be held between the rings.

  According to a third aspect of the present invention, the cylindrical ground electrode extends from the rear end of the nozzle to the vicinity of the nozzle nozzle, and the intermediate insulating member is provided in the middle of the inner periphery of the ground electrode. The tip of the discharge needle faces the intermediate insulating member, and the tip insulating member is provided at the tip of the inner periphery of the ground electrode.

  Furthermore, in the invention according to claim 4, the inner periphery of the intermediate insulating member is gradually narrowed toward the nozzle outlet side.

  According to the present invention, the ground electrode is attached to the nozzle mounting portion by interposing the insulating washer between the ground ring, which is a metal ring provided in the nozzle mounting portion, and the rear end of the nozzle. Since it is electrically connected to the earth ring via the earth electrode, it is possible to interpose an electrostatic washer between the earth electrode and the earth ring simply by interposing an insulating washer between them. Capacitance can be adjusted with an insulating washer. And it was confirmed that the delicate fluctuation of the ion balance can be eliminated by interposing a capacitance at this position.

  According to the second aspect of the present invention, since the insulating washer is clamped between the rear end of the nozzle and the earth ring by screwing the nozzle into the nozzle mounting portion and tightening, the capacitance by the insulating washer Can be easily formed.

  According to the invention of claim 3, the intermediate insulating member is interposed between the ground electrode and the tip of the discharge needle in the middle of the inner periphery of the ground electrode, and the tip is insulated at the tip of the inner periphery of the ground electrode. Since the member is present, spark discharge between the discharge needle and the ground electrode can be effectively prevented.

  According to the invention which concerns on Claim 4, since the inner periphery of an intermediate | middle insulating member is gradually narrowing toward the injection nozzle side of a nozzle, it can squeeze the gas flow in this part and can inject from an injection nozzle.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 6 show the appearance of the nozzle injection type static eliminator of this embodiment, FIG. 1 is a side view, FIG. 2 is a plan view, FIG. 3 is another side view, FIG. 4 is a bottom view, and FIG. 6 and 6 are front views.

  The static eliminator main body 1 is composed of a horizontally long resin power box portion 1A having a rectangular shape and a resin duct portion 1B having an Ω-shaped cross section that also serves as an upper lid that closes the upper surface opening. The mounting plate portion 1a is integrally projected. A mounting hole 1b is provided in the mounting plate portion 1a.

  FIG. 8 is a cross-sectional view taken along the line AA in FIG. 2, and a high voltage power source and other circuits (not shown) mounted on the circuit board 2 are built in the power supply box portion 1A.

  The duct portion 1B has a circular air passage 3, and a hose joint 6 for connecting the air hose 5 is screwed into a metal female screw member 4 embedded in the rear end opening. There is a passage front wall 3a at the front end of the air passage 3, and a short cylindrical nozzle mounting portion 7 is integrally projected on the front surface of the duct portion 1B. It is partitioned by 3a. Discharge needles 8 that are needle-like discharge electrodes are implanted in the passage front wall 3a, and a plurality of small air outlets 9 are provided around the passage front wall 3a.

  Further, as shown in FIG. 8 and FIG. 9 which is a partially exploded view, on the outer periphery of the base end of the nozzle mounting portion 7 and on the front surface of the duct portion 1B, an earth ring 10 which is a thin metal ring is attached. The earth ring 10 is integrally provided with a connection terminal 10a which is a plate piece, and the connection terminal 10a extends into the power supply box portion 1A and is connected to a ground connection line on the circuit board 2. As shown in FIG. 5, a connector 11 for external power supply connection and ground connection is provided on the rear surface of the power supply box 1 </ b> A. By connecting a ground wire to the ground connection terminal of this connector 11, grounding is performed. Ring 10 is grounded. Since the earth ring 10 has a spring property in the thickness direction, as shown in FIG. 7, a large number of cut-and-raised portions 10b are formed on the inner peripheral edge thereof.

  As shown in FIGS. 8 and 9, the discharge needle 8 extends ahead of its tip along the center line of the nozzle mounting portion 7. A connection terminal 12 for connecting the discharge needle 8 to a high voltage power source in the power supply box portion 1A is provided at the planted portion of the discharge needle 8.

  A male screw 7a is formed on the outer peripheral surface of the nozzle mounting portion 7, and the nozzle 13 is removably attached to the nozzle mounting portion 7 by screwing a female screw on the nozzle 13 side into the male screw 7a as described later. The discharge needle 8 protruding from the nozzle mounting portion 7 is included in the nozzle 13.

  The nozzle 13 encapsulates a metal ground electrode 14 and is resin-molded. The outer diameter of the rear half of the outer peripheral surface of the nozzle 13 is substantially the same, but the outer diameter of the front half is tapered.

  FIG. 10 shows a cross section of the ground electrode 14. The ground electrode 14 has a cylindrical shape as a whole, and includes a rear portion 14b having a female screw 14a formed on the inner periphery, an intermediate portion 14d formed with an annular rib 14c on the inner periphery, and a front portion 14f formed with a female screw 14e on the inner periphery. . The intermediate portion 14d is provided with a resin insertion hole 14g for allowing the resin to pass inside and outside when the nozzle 13 is molded, and a step portion 14h is formed on the rear surface of the annular rib 14c. A plurality of annular grooves 14i that partially receive the resin of the nozzle 13 are formed on the outer periphery of the front portion 14f.

  As shown in FIG. 9, when the inner periphery of the nozzle 13 containing the ground electrode 14 is molded, the female screws 14a and 14e of the ground electrode 14 are exposed on the inner periphery of the nozzle 13, and the resin insertion hole of the ground electrode 14 is exposed. An intermediate insulating member 15 made of a part of the resin having passed through 14g is formed in an annular shape integrally with the nozzle 13 on the rear side of the annular rib 14c. The inner peripheral surface 15a of the intermediate insulating member 15 is a frustoconical surface whose inner diameter gradually decreases toward the annular rib 14c.

  In order to insulate the inner periphery of the front portion 14f of the ground electrode 14, an insulating bush 16 which is a resin-molded tip insulating member is fitted with the male screw 16a screwed into the female screw 14e of the ground electrode 14, and the nozzle 13 is The tip opening 16b of the insulating bush 16 serves as an injection port.

  As shown in FIG. 8, the nozzle 13 has an insulating washer 17 fitted on the outer periphery of the nozzle mounting portion 7 on the static eliminator body 1 side, and the female screw 14 a of the ground electrode 14 is screwed into the male screw 7 a of the nozzle mounting portion 7 and tightened. To do. As a result, the insulating washer 17 is sandwiched between the rear end of the ground electrode 14 and the ground ring 10 on the nozzle mounting portion 7 side, and the ground electrode 14 and the ground ring 10 have a capacitance caused by the insulating washer 17 therebetween. It is electrically connected in the intervening state. Therefore, the ground electrode 14 is grounded via the electrostatic capacity of the insulating washer 17.

  Further, the discharge needle 8 is included in the nozzle 13, and the tip 8 a of the discharge end 8 faces the inner side of the intermediate insulating member 15 on the nozzle 13 side.

  As shown in FIG. 1, a power switch 18 and an operation display lamp 19 are provided on one outer surface of the power box 1A.

  In the nozzle injection type static eliminator of the present embodiment configured as described above, when a high voltage is applied to the discharge needle 8 from the high voltage power source in the power supply box portion 1A while feeding gas such as air into the duct portion 1B. Corona discharge occurs between the tip 8a of the discharge needle 8 and the annular rib 14c of the ground electrode 14 closest to the discharge needle 8, and positive and negative ions generated by the discharge are jetted together with gas from the jet port 16b.

  At this time, the gas that has entered the nozzle 13 from the air passage 3 of the duct portion 1 </ b> B through the plurality of small air outlets 9 is throttled by the frustoconical inner peripheral surface 15 a of the intermediate insulating member 15, and the tip of the discharge needle 8. Ions around 8a are collected and ejected from the ejection port 16b.

<Comparison experiment>
The present inventors change the pressure of the supplied air step by step to see how the plus / minus ions ejected from the nozzle 13 change depending on whether the insulating washer 17 is used or not. A comparative experiment was conducted.

  FIGS. 11 to 13 show the case where the insulating washer 17 is not used, FIG. 11 is a graph when the air supply pressure is 0.1 MPa, FIG. 12 is when the pressure is 0.2 MPa, and FIG. 13 is a graph when the pressure is 0.3 MPa. It shows the time transition of changes in ion balance between ions and negative ions.

  14 to 16 show the case where an insulating washer 17 is used. FIG. 14 is a graph when the air supply pressure is 0.1 MPa, FIG. 15 is a graph when 0.2 MPa, and FIG. 16 is a graph when 0.3 MPa. The time transition of the change in ion balance between positive ions and negative ions is shown.

  When the insulating washer 17 is not used, the ion balance slightly fluctuates as time passes, and the fluctuation increases as the air supply pressure is increased. However, when the insulating washer 17 is used, the air supply pressure is reduced. Even if the ion balance is increased, the ion balance does not fluctuate, and it has been confirmed that the ion balance is greatly improved only by interposing the insulating washer 17 between the earth electrode 14 and the earth ring 10.

It is one side view of the nozzle injection type static eliminator of the Example of this invention. It is also a plan view. It is another side view. It is a bottom view. It is a rear view. It is a front view. It is a front view of the state which removed the nozzle. It is sectional drawing in the AA line of FIG. It is sectional drawing which decomposed | disassembled one part. It is sectional drawing of only an earth electrode. It is a graph which shows transition of the plus / minus ion balance when not using an insulating washer, and is when the air supply pressure is 0.1 MPa. It is the same graph when an air supply pressure is 0.2 MPa. It is the same graph when an air supply pressure is 0.3 Mpa. It is a graph which shows transition of the plus / minus ion balance at the time of using an insulating washer, and is when the air supply pressure is 0.1 MPa. It is the same graph when an air supply pressure is 0.2 MPa. It is the same graph when an air supply pressure is 0.3 Mpa.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Static elimination body 1A Power supply box part 1B Duct part 1a Mounting plate part 1b Mounting hole 2 Circuit board 3 Air passage 3a Passage front wall 4 Female screw member 5 Air hose 6 Hose joint nozzle attachment part 7
7a Male screw 8 Discharge needle 8a Discharge needle tip 9 Air outlet 10 Earth ring 10a Connection terminal 10b Cut-and-raised part 11 Connector 12 Connection terminal 13 Nozzle 14 Ground electrode 14a Female screw 14b Rear part 14c Annular part 14e Female part 14f Front part 14g Resin Insertion hole 14h Step 14i Annular groove 15 Intermediate insulating member 15a Inner peripheral surface 16 Insulating bush (tip insulating member)
16a Male thread 16b Tip opening (jet port)
17 Insulating washer 18 Power switch 19 Operation indicator lamp

Claims (4)

  A cap-shaped insulating nozzle attached to the nozzle mounting part of the static eliminator body contains the discharge needle, which is a needle-like discharge electrode, and a high voltage is applied to the discharge needle from the high-voltage power supply in the static eliminator body. In the nozzle injection type static eliminator that injects gas from the nozzle while discharging between the nozzle and the ground electrode on the nozzle, which is a base, a metal ring is connected to the nozzle mounting portion to connect the ground electrode on the nozzle side to the ground. An earth ring is provided, and an insulating washer is interposed between the earth ring and the rear end of the nozzle to attach the nozzle to the nozzle mounting portion, whereby the earth electrode is electrically connected to the earth ring via the insulating washer. Nozzle injection type static eliminator characterized in that it is connected.   The nozzle mounting part protrudes in a cylindrical shape from the front surface of the static eliminator body, a male screw is formed on the outer periphery thereof, and an earth ring is provided on the front surface of the static eliminator body at the base end of the outer periphery of the nozzle mounting part. Is installed in the front surface of the static eliminator body in the nozzle mounting portion, and the nozzle-side ground electrode is provided in a cylindrical shape on the inner periphery of the nozzle, and is screwed onto the inner periphery of the ground electrode with the male screw of the nozzle mounting portion. A female screw is formed, and the male and female screws are screwed together and the nozzle is fastened to the nozzle mounting portion so that the insulating washer is sandwiched between the rear end of the earth electrode and the earth ring. The nozzle injection type static eliminator according to claim 1.   A cylindrical ground electrode extends from the rear end of the nozzle to the vicinity of the nozzle nozzle, and an intermediate insulating member is provided in the middle of the inner periphery of the ground electrode. The nozzle injection type static eliminator according to claim 2, wherein a tip insulating member is provided at a tip of the inner periphery of the ground electrode.   The nozzle injection type static eliminator according to claim 3, wherein an inner periphery of the intermediate insulating member is gradually narrowed toward an injection port side of the nozzle.

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