JPH0680300U - Static eliminator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a small-sized static eliminator that can efficiently perform local static neutralization efficiently. A positive discharge electrode 6 and a negative discharge electrode 7 are provided at a predetermined interval on a head 1 made of an electrically insulating material, and a detection electrode 8 for detecting an ion current between the positive and negative discharge electrodes. And an air injection hole 2 for injecting air in the direction of these discharge electrodes. An adjustment circuit is provided for adjusting the voltage applied to at least one of the positive discharge electrode and the negative discharge electrode from the ion current detected by the detection electrode in order to achieve ion balance.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a static eliminator that applies positive and negative high voltages to positive and negative discharge electrodes to generate positive and negative ions and eliminates a charged object.

[0002]

[Prior art]

 As is apparent from Japanese Patent Application Laid-Open No. 3-266398, the applicant of the present application arranges a detection electrode for detecting an ionic current between positive and negative discharge electrodes in this type of static eliminator, and the detection electrode detects the ion current. We have already provided an ion balance control circuit that adjusts the voltage applied to at least one of the positive discharge electrode and the negative discharge electrode from the ion current to equalize the positive and negative ions.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to provide a small-sized static eliminator that can efficiently perform local static neutralization by using such an ion balance control circuit.

[0004]

[Means for Solving the Problems]

 The static eliminator according to the present invention is provided with a positive discharge electrode and a negative discharge electrode at a predetermined interval on a head made of an electrically insulating material, and detects an ion current between the positive and negative discharge electrodes. Electrodes are provided, and air ejection holes for ejecting air in the direction of these discharge electrodes are provided in the head. Then, in order to achieve ion balance, an adjustment circuit is provided for adjusting the voltage applied to at least one of the positive discharge electrode and the negative discharge electrode from the ion current detected by the detection electrode.

Each of the positive discharge electrode, the negative discharge electrode, and the detection electrode is fixed to the head in a hole provided in the head.

[0006]

[Action]

 To remove electricity with this static eliminator, aim the head away from the charged object and apply positive and negative high voltages to the positive and negative discharge electrodes while simultaneously generating positive and negative ions. , Air is sprayed from the air spray hole to spray positive and negative ions on the charged object. At the same time, the detection electrode detects the ion current, and the voltage applied to the discharge electrode is adjusted so that the positive and negative ions are equal in amount.

By arranging the plus and minus discharge electrodes and the detection electrodes individually in the holes of the head, it is possible to protect these electrodes and to make the discharge have directivity.

[0008]

【Example】

 Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, in this static eliminator, a circular head 1 made of an electrically insulating material such as plastic serves as an air nozzle and an electrode holder. That is, the head 1 is provided with an air injection hole 2 opening at the center of the front surface 1a along the axis, and three circular holes are formed on the front surface 1a with the air injection hole 2 as the center. 3 and 4 are provided, and needle-shaped positive and negative discharge electrodes 6 and 7 are provided in the circular holes 3 and 4 on both sides of the air injection hole 2 which are aligned on the same line AA. The detection electrodes 8 are provided in the circular holes 5 which are respectively arranged and are lined up with the air injection holes 2 on the line BB orthogonal to the line AA.

The plus / minus discharge electrodes 6 and 7 and the detection electrodes 8 are implanted in the head 1 in the circular holes 6 and 7 and 8 respectively, and the discharge electrodes 6 and 7 are circular as shown in FIG. The tip is located slightly inside the opening without protruding from the holes 6 and 7, but the tip of the detection electrode 8 slightly protrudes from the circular hole 8 as shown in FIG.

On the rear end surface of the head 1, a connection pipe 9 for connecting to an air hose (not shown) is directly connected to the air injection hole 2, and the electrodes 6, 7 and 8 are connected to the circuit shown in FIG. Electric wires 10 for connection are respectively connected, and these connecting portions are covered with a cylindrical protective cover 11 provided on the rear end surface of the head 1.

In FIG. 5, the plus and minus discharge electrodes 6 and 7 are rectified and applied by the rectifier circuits 14 and 15 with the plus high voltage and minus high voltage generated in the respective high voltage generation circuits 12 and 13. To be done. Further, the ion current detected by the detection electrode 8 is an ion balance control circuit including an amplifier, a level shift circuit, a voltage regulator, an alarm device, etc. (For details of the configuration and operation, refer to the above-mentioned JP-A-3-266398. (See the official gazette), and either positive high voltage or negative high voltage is automatically adjusted according to the difference between the positive and negative ion amounts.

In order to remove the electric charge from the charged object with this static eliminator, the head 1 is directed away from the charged object, and the positive and negative discharge electrodes 6 At 7, the positive and negative discharges are generated. The positive and negative ions generated by the discharge are blown onto the charged object by the air jetted from the air jet holes 2. Further, an ion current is detected by the detection electrode 8 between the plus and minus discharge electrodes 6 and 7, and the plus high voltage generation circuit 12 or the minus high voltage generation circuit 13 is controlled according to the difference between the plus and minus ion amounts, and the plus discharge is performed. The voltage applied to the electrode 6 or the negative discharge electrode 7 is automatically adjusted to achieve ion balance.

[0013]

[Effect of device]

 The static eliminator of the present invention has the following effects. With the head facing the charged object, positive and negative high voltages are applied to the positive and negative discharge electrodes provided on the head to generate positive ions and negative ions at the same time, while the air provided on the head Air is ejected from the ejection hole to blow positive and negative ions onto the charged object, and at the same time, the detection electrode provided in the same head detects the ion current so that the positive and negative ions become equal in amount. Since the voltage applied to the discharge electrode is adjusted, local static charge removal can be performed efficiently and accurately without reverse charging.

Since the head serves both as the electrode holder for the plus / minus discharge electrodes and the detection electrodes and as the air nozzle for ejecting air, the head can be downsized and the operability is good.

By disposing the plus / minus discharge electrode and the detection electrode individually in the hole of the head, these electrodes can be protected and the discharge can have directivity.

[Brief description of drawings]

FIG. 1 is a front view of an example of a static eliminator according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view with a part cut away along the line AA in FIG.

FIG. 4 is a side view in which a part is similarly cut out along the line BB.

FIG. 5 is a block diagram showing an electrical configuration.

[Explanation of symbols]

 1 head 2 air injection hole 3/4 5 circular hole 6 positive discharge electrode 7 negative discharge electrode 8 detection electrode

Claims (2)

[Scope of utility model registration request] 1. A head made of an electrically insulating material is provided with a plus discharge electrode and a minus discharge electrode at a predetermined interval, and a detection electrode for detecting an ion current between these plus and minus discharge electrodes. In addition, an air injection hole for injecting air in the direction of these discharge electrodes is provided in the head, and the ion current detected by the detection electrode is applied to at least one of the plus discharge electrode and the minus discharge electrode. A static eliminator comprising an adjusting circuit for adjusting the voltage to be applied. 2. The static eliminator according to claim 1, wherein each of the positive discharge electrode, the negative discharge electrode, and the detection electrode is fixed to the head within a hole provided in the head.