JP4595988B2 - Ion type static eliminator - Google Patents

Description

  The present invention relates to a high voltage application type ionization static elimination device called an ionizer.

  This static eliminator removes static electricity from charged objects (electrification objects) such as products in the manufacturing or processing of plastic, paper, fiber, glass, etc., for example. Used to prevent failure due to.

  As this kind of ionization static elimination apparatus, for example, one described in Patent Document 1 is known.

  3 and 4 show an example of a conventional ionization static elimination apparatus having basically the same structure as that described in Patent Document 1 and the like.

  The static eliminator includes a casing (1) having a U-shaped cross section constituting a ground electrode, and a rod-shaped discharge electrode support (2) supported in the casing (1).

The discharge electrode support (2) includes a round bar-shaped internal high voltage part (3) to which a high voltage is applied, and a cylindrical dielectric insulating material (4) in which the high voltage part (3) is inserted. Fit between a plurality of cylindrical conductive metal bodies (5) spaced in the longitudinal direction on the outer periphery of the material (4) and a metal body (5) on the outer periphery of the insulating material (4). Synthetic resin spacer / insulator (6), thick cylindrical synthetic resin insulator (7) fitted on the outer periphery of metal body (5) and insulator (6), and insulator (7) The discharge needle (8) is press-fitted into a plurality of holes formed at the same position in the circumferential direction of the peripheral wall and has a base end pressed against the outer peripheral surface of the metal body (5). A discharge electrode (9) is constituted by the metal body (5) and the discharge needle (8), and the tip side portion of the discharge needle (8) protrudes radially outward of the insulating material (7) from the insulating material (7) , It faces the opening of the casing (1). The metal body (5) is insulated from the internal high-voltage part (3) by the high-resistance dielectric insulator (4) and constitutes a capacitor coupling with the internal high-voltage part (3). A high voltage is applied to (8). Although not shown, a plurality of lengths of the insulating material (7) are supported on the casing (1) by an insulating material made of ABS resin or the like. A space is formed between the electrode support (2).

  Since the conventional static eliminator has a structure that relies on air insulation for a lot of insulation, it has a structure in which liquid such as water can easily enter the casing (1).

  Currently, various plastic materials are widely used for packing materials, casings and the like. Many of these plastic materials are insulating materials, and naturally, static electricity is easily generated. And in the production process in each industry, the generation of static electricity causes production obstacles such as adhesion of dust.

  Various types of static eliminators are used for the removal of static electricity, but the high voltage application type ionization static eliminator as described above is often used because of its high efficiency and performance stability.

  In the ionization static elimination apparatus, since a high voltage is applied to the discharge needle, dust is accumulated at the tip of the discharge needle, albeit little by little. This accumulated dust weakens the electric field at the tip of the discharge needle and causes performance degradation. Therefore, periodic cleaning is indispensable. Moreover, since dirt adheres to the insulating material that supports the discharge needle as it is used, periodic cleaning is required as well.

  The main method of cleaning is cleaning with a nylon brush or clean waste. If a liquid such as tap water is used, the adhering dust melts and enters the static eliminator together with the liquid, causing insulation deterioration and equipment failure. However, such a dry cleaning method cannot completely remove the attached dust.

  In the pharmaceutical and food industries, regular cleaning and boiling disinfection of production machinery is a common-sense maintenance. For this reason, a protective cover may be installed to prevent the static eliminator from being exposed to liquids. However, it is not only necessary to install and remove the protective cover, but it is also difficult to clean the static eliminator itself due to the protective cover. I made it to something. In addition, there is an example in which only the static eliminator is removed at the time of liquid cleaning, but a great deal of labor is required for the removal and reattachment work.

  An object of the present invention is to solve the above-described problems, provide an ionization static elimination device capable of simple and high-performance liquid cleaning, and facilitate cleaning of other equipment provided with the static elimination device.

  The ionization static elimination apparatus according to the present invention is characterized in that a discharge electrode support having a discharge needle constituting a discharge electrode is covered with a synthetic resin insulating material leaving only a portion of the discharge needle including the tip. Is.

  Only the portion of the discharge needle not covered with the synthetic resin insulating material is exposed to the outside of the synthetic resin insulating material.

  The base of the discharge needle may be covered with synthetic resin insulation, and only the tip of the discharge needle may be exposed to the outside of the synthetic resin insulation. It may be exposed to the outside of the material.

  Since only the portion of the discharge needle is exposed to the outside of the synthetic resin insulating material and the other portion is covered with the synthetic resin insulating material, cleaning with a liquid such as water is possible.

In the ionization static elimination apparatus of the present invention, for example, the discharge electrode support includes a rod-shaped internal high-voltage portion to which a high voltage is applied, a cylindrical dielectric insulating material into which the high-voltage portion is inserted, and an outer periphery of the dielectric insulating material. A discharge electrode fixed to the tube, the discharge electrode being a cylindrical conductive metal body fixed to the outer periphery of the dielectric insulating material, and a base end portion fixed to the outer periphery of the conductive metal body. And a discharge needle protruding outward in the radial direction .

  Since the base end portion of the discharge needle is fixed to the outer peripheral surface of the conductive metal body, the discharge needle is surely supported and there is no fear of dropping off.

  The discharge needle is fixed to the conductive metal body by welding, for example.

In the above ionization static eliminator, for example, a discharge electrode support is arranged inside a U-shaped casing including a ground electrode, and a water-repellent insulating material is fixed so as to seal the opening of the casing, The needle penetrates the water-repellent insulating material, the tip side portion of the discharge needle is exposed to the outside, and the space between the casing and the water-repellent insulating material is filled with another insulating material.

  In the above ionization static elimination apparatus, for example, a plurality of discharge electrodes are provided at intervals in the length direction of the internal high voltage portion, and a plurality of discharge needles are arranged at the same position in the circumferential direction of the dielectric insulating material. Yes.

  In the above ionizing static eliminator, for example, a part of the rectangular parallelepiped water-repellent insulating material is fitted into the opening of the casing and the opening is sealed, and the water-repellent insulating material on the opposite side of the conductive metal body is flat. A plurality of conical recesses are formed on the surface, each discharge needle passes through a hole formed in the bottom of each recess, and the tip of each discharge needle is located in each recess.

  According to the ionization static elimination apparatus of the present invention, as described above, liquid cleaning is possible, and dust accumulated at the tip of the discharge needle can be more reliably removed.

  In addition, for example, in the pharmaceutical and food industries, when the equipment provided with the ionization static eliminator is liquid-cleaned, the ionization static eliminator can also be liquid-washed together. Removal of the static eliminator and re-installation work become unnecessary, and cleaning work becomes easy.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  Although the static eliminator can be used in various directions, in the following description, the top and bottom of FIGS. 1 and 2 are the top and bottom.

  The static eliminator includes a casing (10), a discharge electrode support (11) disposed inside the casing (10), and holds the discharge electrode support (11) with respect to the casing (10) and supports the discharge electrode. Two kinds of synthetic resin insulating materials (12) and (13) covering most of the body (11) are provided.

  The casing (10) is composed of, for example, a ground electrode portion (14) and a lid portion (15) made of conductive stainless steel. The ground electrode portion (14) is an elongated one having a U-shaped cross section with an open top, and the elongated opening (16) formed in the majority of the length of the bottom wall is sealed by the lid portion (15). .

  The discharge electrode support (11) has a rod-like shape, a round bar-shaped internal high-voltage portion (17) to which a high voltage is applied, and a cylindrical dielectric insulator (18) into which the high-voltage portion (17) is inserted. ) And a discharge electrode (19) provided on the outer periphery of the insulating material (18) at intervals in the length direction.

Discharge electrodes (19), the outer peripheral end up stopping was such as conductive stainless steel conductive metal material of the insulating material (18) and (20), is fixed proximal portion conductive to the outer periphery of the metal body (20) The discharge needle (21) protrudes radially outward of the metal body (20) . For the discharge needle (21), a material that is not easily oxidized or worn, for example, a titanium alloy is used, and its base end is firmly fixed to the metal body (20) by, for example, spot welding. The discharge needle (21) has a round bar shape with a sharp tip, and is located at the same position in the circumferential direction of the insulating material (18).

  The insulating material (12) (13) was filled in the space between the casing (10) and the water-repellent insulating material (12), and the water-repellent insulating material (12) that seals the opening at the upper end of the casing (10). It consists of a filling insulating material (13).

  The water repellent insulating material (12) is made of a highly insulating synthetic resin material having water repellency, such as a fluororesin, and has an elongated rectangular parallelepiped shape. The width of the upper portion of the insulating material (12) is larger than that of the lower portion, and a downward stepped portion (22) is formed between them. The width of the upper portion of the insulating material (12) is substantially equal to the outer width of the ground electrode portion (14), and the width of the lower portion is substantially equal to the inner width of the ground electrode portion (14). The lower portion of the insulating material (12) is fitted inside the upper end portion of the ground electrode portion (14), and the step portion (22) is in contact with the upper end of the ground electrode portion (14). If necessary, the insulating material (12) is fixed to the ground electrode portion (14) by an appropriate fixing means. On the upper flat surface of the insulating material (12), a plurality of conical recesses (23) with the upper side expanded are formed, and a circular hole (24) penetrating the bottom of the recess (23) vertically is formed. ing.

  The discharge electrode support (11) is arranged in the lower casing (10) of the insulating material (12) so that the discharge needle (21) faces upward, and the discharge needle (21) is insulated from the lower side. The upper part of the metal body (20) is in contact with the lower surface of the insulating material (12) by being press-fitted into the hole (24) of (12). The portion of the insulating material (12) where the hole (24) is formed covers the proximal end portion of the discharge needle (21). The tip of the discharge needle (21) is exposed to the outside in the recess (23), but the tip (upper end) is located in the recess (23) and exposed to the outside. It is located below the upper surface of (12). Although not shown, both ends of the discharge electrode support (11) are closely fitted to the casing (10) and in close contact with the end surface of the insulating material (12), for example, at both ends of the casing (10). It is supported by an insulating material made of fluororesin.

  The filling insulating material (13) is filled in a space surrounded by the casing (10), the water repellent insulating material (12), and the insulating material at both ends (not shown), thereby allowing the discharge electrode support (11) to discharge. The part except the needle (21) is covered. The filling insulating material (13) is made of a highly insulating synthetic resin such as an epoxy resin.

  The above-described static eliminator is assembled as follows, for example.

  First, the discharge needle (21) is inserted into the hole (24) of the water repellent insulating material (12), the insulating material (12) and the discharge electrode support (11) are combined, and the lid portion (15) is attached. The insulating material (12) is fixed to the ground electrode portion (14) so that the discharge electrode support (11) is positioned inside the non-ground electrode portion (14). Then, an insulating material (not shown) is fixed to both ends of the ground electrode portion (14) to seal both ends of the ground electrode portion (14) and to support both ends of the discharge electrode support (11). Next, the ground electrode portion (14) is turned upside down as shown in the figure, and the opening (16) is opened in the space inside the ground electrode portion (14) sealed with the water repellent insulating material (12) and the insulating material not shown. From, for example, a low-viscosity two-component mixed epoxy resin is filled and solidified over time to form the filled insulating material (13). Then, the opening (16) of the ground electrode portion (14) is sealed by the lid portion (15).

  In the static eliminator assembled in this way, the metal body (20) of the discharge electrode (19) is insulated from the internal high voltage section (17) by the high resistance dielectric insulator (18), and the internal high voltage This constitutes a capacitor coupling with the section (17). Then, by applying a high voltage to the high voltage part (17), a high voltage is applied to the discharge needle (21), and ions are generated.

  In the static eliminator described above, the portion of the discharge electrode (19) other than the tip side portion of the discharge needle (21) is covered with the insulating material (12) (13), and the casing (10) constituting the ground electrode and There is an insulating material (12) (13) between the discharge electrode (19), there is no gap for liquid to enter, and in addition to the tip side portion of the discharge needle (21), the casing (10) Since the outer surface of the water repellent insulating material (12) is only exposed, liquid cleaning is possible. In the example using the above materials for each part, cleaning with hot water at 100 ° C. was possible.

  The portion of the discharge needle (21) that is exposed to the outside is surrounded by a water-repellent insulating material in the recess (23) and is isolated from the casing (10) that constitutes the ground electrode. Therefore, the continuity between the discharge needle (21) and the casing (10) can be prevented by the adhered liquid.

FIG. 1 is a cross-sectional view of an ionization static elimination apparatus showing an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of FIG. FIG. 3 is a cross-sectional view of an ionization static elimination apparatus showing a conventional example. 4 is a longitudinal sectional view of FIG.

Explanation of symbols

(10) Casing
(11) Discharge electrode support
(12) Water repellent insulation
(13) Filling insulation
(17) Internal high voltage section
(18) Dielectric insulation
(19) Discharge electrode
(20) Conductive metal body
(21) Discharge needle
(23) Recess
(24) Hole

Claims (3)

A discharge electrode support having a discharge needle constituting the discharge electrode is covered with a synthetic resin insulating material, leaving only a portion of the discharge needle including the tip, and a high voltage is applied to the discharge electrode support. It has a rod-shaped internal high-voltage part, a cylindrical dielectric insulating material into which the high-voltage part is inserted, and a discharge electrode fixed to the outer periphery of the dielectric insulating material. In an ionization static elimination device comprising a cylindrical conductive metal body that is fixed, and a discharge needle that has a base end fixed to the outer periphery of the conductive metal body and protrudes radially outward of the conductive metal body,
A discharge electrode support is arranged inside a U-shaped casing including a ground electrode, a water repellent insulating material is fixed so as to seal the opening of the casing, and the discharge needle penetrates the water repellent insulating material. An ionization static eliminator characterized in that the tip side of the discharge needle is exposed to the outside, and the space between the casing and the water repellent insulating material is filled with another insulating material . A plurality of discharge electrodes are provided at intervals in the longitudinal direction of the internal high voltage unit, according to claim 1 in which a plurality of discharge needles, characterized in that it is arranged in the circumferential direction of the same position of the derivative insulation Ionization static eliminator. Part of the rectangular parallelepiped water-repellent insulating material is fitted into the opening of the casing, the opening is sealed, and a plurality of conical recesses are formed on the flat surface of the water-repellent insulating material on the opposite side of the conductive metal body. The ionization static elimination apparatus according to claim 2 , wherein each discharge needle passes through a hole formed in the bottom of each recess, and a tip of each discharge needle is located in each recess.

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