JP2013081269A - Lightning protection equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightning protection equipment which prevents the damage caused by self excited vibrations.SOLUTION: An electric charge diffusion device 10 of a lightning protection equipment includes: a pillar 11 erected in a protective construction; multiple protruding needles 12 which are provided at a tip of the pillar 11 and are disposed so as to be radially extended; and latitude direction reinforcement members 13 and longitude direction reinforcement members 14 which are disposed so as to intersect with the protruding needles 12 and are fixed lying astride the two or more protruding needles 12.

Description

  The present invention relates to a lightning protection device that dissipates ions in the air, relaxes an electric field in the air, and protects a structure from lightning, and more particularly relates to a charge dissipator in the lightning protection device.

  When the electric thundercloud approaches, an electric field is formed between the thundercloud and the ground, and when the electric field strength gradually increases, the air insulation is finally destroyed, and a discharge occurs between the thundercloud and the ground. This is a lightning strike. Structures that are intended to protect against lightning strikes, such as structures (buildings, etc.) or their surroundings by providing charge dissipators (also called ion diffusers or ionizers) to dissipate ions with the opposite polarity to the bottom of thunderclouds Lightning protection equipment that relaxes the electric field in the sky and delays the occurrence of lightning strikes is known (see Patent Documents 1 and 2).

  Conventional charge dissipators include umbrella-type charge dissipators, ball-type charge dissipators, dissipating wires, etc., which use the tip discharge phenomenon, which is a natural phenomenon during lightning strikes, to protect structures, the earth, etc. By dissipating the induced charge and relaxing the electric field, it prevents sudden movement of charge and prevents damage from direct lightning strikes.

JP-A-53-39450 US Pat. No. 5,043,527

  However, since these charge dissipators are composed of thin wire, that is, projecting needles, the environment where the wind receiving area increases due to icing, snowing, etc., or where strong winds are generated When used in the above, there is a problem that the charge dissipator may be damaged by the generation of self-excited vibration.

  The present invention has been created in view of the above-described circumstances, and an object thereof is to provide a lightning protection device capable of preventing damage due to self-excited vibration.

  In order to solve the above-mentioned problems, the present invention is a structure or a support column standing on the ground, a plurality of conductive needles provided at the tip of the support column and arranged to extend radially, And a reinforcing member that is arranged so as to intersect with the conductive needles and is fixed across the two or more conductive needles.

  According to the present invention, even when used in an environment where the wind receiving area of a plurality of conductive needles increases due to an icing phenomenon or the like, or even in an environment where strong winds are generated, the conductive needles due to self-excited vibrations. This can contribute to the prevention of stable direct lightning damage.

It is a mimetic diagram showing lightning protection equipment concerning an embodiment of the present invention. It is the figure which looked at the electric charge dissipation device of the installation state of FIG. 1 from the top. It is the figure which looked at the electric charge dissipation device of the installation state of FIG. 1 from the side. It is a perspective view which shows the fastener of FIG. It is a figure which shows the state immediately after carrying out thermite joining of the support | pillar and several protrusion needles. FIG. 6 is a partially broken enlarged view of the nugget and the trumpet tube of FIG. 5 viewed from the X direction. It is a figure which shows the resin coating area | region of a charge dissipation device, and is the figure which looked at the charge dissipation device of FIG. 1 from the direction orthogonal to the axis line of a support | pillar. It is a figure which shows the resin coating area | region of a charge dissipation device, and is the figure which looked at the charge dissipation device of FIG. 1 from the front end side of the support | pillar.

  Embodiments of the present invention will be described below with reference to the drawings. The same code | symbol is attached | subjected to the same structure and the overlapping description is abbreviate | omitted.

<Lightning protection equipment>
First, the lightning protection equipment which concerns on embodiment of this invention is demonstrated. Drawing 1 is a mimetic diagram showing the lightning protection equipment concerning the embodiment of the present invention. As shown in FIG. 1, a lightning protection apparatus 1 according to an embodiment of the present invention is an apparatus for preventing a lightning strike to a protective structure (for example, a building) S, and includes a plurality of charge dissipators (ion dissipators). , Also referred to as an ionizer) 10, a ground 20, and a conductive wire (for example, copper stranded wire) 30. The plurality of charge dissipators 10 are erected obliquely upward on the side wall of the protective structure S, and the plurality of projecting needles 12 (see FIG. 2) provided on each of the plurality of charge dissipators 10 are electrically conductive. It is electrically connected to the ground 20 via a line 30.

  When the negative electric field generated by the thundercloud is extremely increased at the tip of the tip 12 (see FIG. 2) of the charge dissipator 10, positive ions that are positively ionized due to ionization of the atmosphere are generated and emitted toward the sky ( Tip discharge phenomenon, so-called corona discharge). The charge dissipator 10 is electrically connected to the ground around the protective structure S by the ground 20, and since positive charges are supplied from the ground to the charge dissipator 10, there is a thundercloud above and a negative electric field is formed. During this time, the charge dissipator 10 continues to emit positive ions from the needle 12. That is, it is considered that the positive charge accumulated on the ground around the ground 20 moves to the charge dissipator 10 installed in the protective structure S through the conductive wire 30 and is released as positive ions. While the charge dissipator 10 emits positive ions, the electric field in the space around the upper part of the charge dissipator 10 is weakened, so that a space with a relatively strong electric field becomes a lightning path. Therefore, the space around the charge dissipator 10 having a weak electric field is less likely to be a lightning path than before the charge dissipator 10 is installed, and the lightning protection device 1 exhibits a lightning protection effect that makes it difficult to strike lightning.

<Charge dissipator>
Next, the structure of the charge dissipator 10 according to the embodiment of the present invention will be described. 2 is a top view of the charge dissipator in the installed state of FIG. 1, and FIG. 3 is a side view of the charge dissipator in the installed state of FIG. FIG. 4 is a perspective view showing the stopper of FIG. FIG. 5 is a view showing a state immediately after the support and the plurality of protruding needles are thermit bonded. FIG. 6 is a partially broken enlarged view of the nugget and the trumpet tube of FIG. 5 viewed from the X direction. FIG. 7 is a diagram illustrating a resin coating region of the charge dissipator, and is a view of the charge dissipator of FIG. 1 as viewed from a direction orthogonal to the axis of the support column. FIG. 8 is a view showing a resin coating region of the charge dissipator, and is a view of the charge dissipator of FIG. 1 as viewed from the front end side of the support column.

  As shown in FIGS. 2 and 3, the charge dissipator 10 is a so-called ball-type charge dissipator, and includes a support column 11, a plurality of protruding needles 12, a plurality of latitude direction reinforcing members 13, and a plurality of meridian direction reinforcements. A member 14 and a plurality of stoppers 15 are provided. In FIG. 2, the plurality of stoppers 15 are omitted.

  The support | pillar 11 is a rod-shaped member made from metal (for example, SUS steel), The base end is being fixed to the protection structure S with the bracket, the volt | bolt, etc.

  The plurality of protruding needles 12 are conductive needle-like objects provided at the tip of the column 11 and extend radially from the tip of the column 11 so that at least one of the protruding needles 12 faces upward. In the present embodiment, 32 projecting needles 12 made of SUS steel having a wire diameter of 2.6 mm are radially extended so as to be uniformly distributed in a hemisphere having an outer diameter of 1.2 m centering on the tip of the column 11. ing.

  The plurality of latitude-direction reinforcing members 13 are metal (for example, SUS steel) conductive members having a ring shape extending in the direction of the latitude of the hemisphere centered on the tip of the support 11, and intersect the projecting needle 12. In place, it is fixed to the needle 12 by a stop 15. In the present embodiment, four latitude direction reinforcing members 13 having different radii are arranged at intervals.

  The plurality of meridional direction reinforcing members 14 are metal (for example, SUS steel) conductive members having a circular arc shape extending in the meridian direction of the hemisphere centering on the tip of the column 11, and intersect with the projecting needle 12. In place, it is fixed to the needle 12 by a stop 15. In the present embodiment, the two meridian direction reinforcing members 14 are disposed so as to be orthogonal to each other.

  As shown in FIG. 4, the plurality of stoppers 15 are fixed to the projecting needle 12 and the latitude direction reinforcing member 13 or the meridian direction reinforcing member 14 (the latitude direction reinforcing member 13 in FIG. 4) and fixed to the projecting needle and reinforcement. This is a conductive cross fastener made of metal (for example, SUS steel) for fixing the members 13 and 14.

  As shown in FIGS. 5 and 6, the charge dissipator 10 further includes a nugget 16 and a trumpet tube 17.

  The nugget 16 is an enlarged diameter portion formed when the tip of the support 11 and the plurality of protruding needles 12 are joined by thermite welding.

  The trumpet tube 17 is a metal member (for example, made of copper) that has a cylindrical shape through which the base ends of the plurality of projecting needles 12 are inserted, and the tip end side of the trumpet tube 17 has a tapered shape that increases in diameter toward the tip. .

  Further, as shown in FIGS. 7 and 8, a portion excluding the tips of the plurality of projecting needles 12, a plurality of latitude direction reinforcing members 13, a plurality of meridian direction reinforcing members 14, a plurality of stoppers 15 and a trumpet tube 17 It is covered with a resin film and a water repellent film (resin coating region C in FIGS. 7 and 8).

<Manufacturing method of charge dissipator>
Then, the manufacturing method of the electric charge dissipation device 10 which concerns on embodiment of this invention is demonstrated. First, as shown in FIG.5 and FIG.6, the front-end | tip of the support | pillar 11 and the base end of the several protruding needle 12 bundled are joined by thermite welding. That is, it arrange | positions in the resin-made type | molds in the state which contact | abutted the front end of the support | pillar 11, and the base end of the several bundling needle | hook 12 bundled, For example, thermite agent containing the powder of copper and tin is heated with an explosive. Then, the molten metal is melted and poured into the contact portion, and the distal end of the support column 11 and the proximal ends of the plurality of protruding needles 12 are joined by thermite welding. The nugget 16 is formed by such thermite welding. After the nugget 16 is formed, the welded support column 11 and the plurality of projecting needles 12 are removed from the mold, the plurality of projecting needles 12 are inserted into the trumpet tube 17, and the base end of the trumpet tube 17 and the leading end of the nugget 16 are fixed by bonding or the like. To do.

  Subsequently, as shown in FIGS. 7 and 8, a predetermined number of protruding needles 12 are bent at the proximal end side to open at a predetermined angle, and the weft direction reinforcing member 13 corresponding to the opened protruding needle 12 is moved to a predetermined position. The projecting needle 12 and the latitude direction reinforcing member 13 are fixed by the stopper 15 at the intersection with the projecting needle 12. This operation is repeated for all the projecting needles 12 and the latitude direction reinforcing members 13 in order from the projecting needle 12 having a large bending angle and the latitude direction reinforcing members 13 on the support column 11 side.

  All the projecting needles 12 are opened and radially extended, and all the latitude direction reinforcing members 13 are caulked and fixed to the projecting needles 12 with stoppers, and then the meridian direction reinforcing members 14 are arranged at predetermined positions. The projecting needle 12 and the meridian direction reinforcing member 14 are fixed by the stopper 15 at the intersection. Such an operation is repeated for all the meridian direction reinforcing members 14.

  The latitude direction reinforcing member 13 and the meridian direction reinforcing member 14 and the protruding needle 12 are fixed by crossing the protruding needle 12 and the latitude direction reinforcing member 13 (or the meridian direction reinforcing member 14) in the cross direction of the stopper 15 which is a cross stopper. The protruding needle 12 and the reinforcing members 13 and 14 and the stopper 15 are caulked and fixed by being accommodated in the four disposed grooves and caulking the groove of the stopper 15 using a jig (dedicated compressor). It is realized by.

  In addition, since the dissipated current that flows due to the tip discharge phenomenon is very weak, it is desirable that the projecting needle 12 and the reinforcing members 13 and 14 are electrically connected with low resistance. In this embodiment, the contact resistance of the crimping surface in the caulking is reduced by using the stopper 15 that is a metal cross stopper.

  Subsequently, the resin paint is poured into the trumpet tube 17, and the portions excluding the tips of the plurality of protruding needles 12, the plurality of latitude direction reinforcing members 13, the plurality of meridian direction reinforcing members 14, the plurality of stoppers 15, and the trumpet tube These are coated with a resin film by applying a resin paint using a brush to 17 (resin coating region in FIGS. 7 and 8). In this embodiment, the water-repellent film is formed by applying a water-repellent coating on the resin film using a brush.

In the lightning protection apparatus 1 according to the embodiment of the present invention, since the plurality of projecting needles 12 extending radially are fixed to each other by the reinforcing members 13 and 14, the wind receiving area of the lightning protection apparatus 1 increases due to an icing phenomenon or the like. Even when used in an environment where high winds are generated, it is possible to prevent damage to the charge dissipator 10 due to self-excited vibration and to contribute to the prevention of stable direct lightning damage.
Further, in the lightning protection device 1 according to the embodiment of the present invention, the projecting needle 12 and the reinforcing members 13 and 14 are fixed by caulking using the stopper 15 that is a cross stopper, so that the contact resistance of the crimping surface is reduced. can do.
Moreover, in the lightning protection apparatus 1 according to the embodiment of the present invention, since the support 11 and the plurality of protruding needles 12 are joined by thermite welding, the plurality of protruding needles 12 can be easily fixed to the support.
Moreover, since the lightning protection apparatus 1 which concerns on embodiment of this invention is coat | covered with the resin film and the water-repellent film in the state which the front-end | tip exposed the some needle | hook 12, the dissipating performance of the electric charge dissipator 10 is ensured. In addition to preventing corrosion, icing and snowing can be prevented.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably. The number of projecting needles 12 and the radial direction are not limited to those described above. For example, 120 projecting needles 12 may be radially extended so as to be uniformly arranged in the entire sphere. Alternatively, any configuration may be used as long as the plurality of projecting needles 12 extend radially in three dimensions. Further, the number of the latitude direction reinforcing members 13 and the meridian direction reinforcing members 14 is not limited to those described above, and the reinforcing members other than the latitude direction reinforcing members 13 and the meridian direction reinforcing members 14 are fixed across the two or more protruding needles 12. It may be configured to. Further, the protrusion 12 and the reinforcing members 13 and 14 may be fixed by a stopper other than the cross stopper, welding, adhesion, or the like. In addition, the charge dissipator 10 of the present invention can be installed on the side surface of a steel tower of an umbrella-type charge discharger, the rooftop of a building, the ground around a small-scale facility, and the like. Further, the reinforcing member is not limited to one made of a conductive material, and the number of protruding needles 12 fixed to each other by one reinforcing member may be two or more.

1 Lightning Protection 10 Charge Dissipator 11 Prop 12 Projection Needle (Conductive Needle)
13 Latitudinal direction reinforcing member (Reinforcing member)
14 Meridian direction reinforcing member (Reinforcing member)
15 Stopper 16 Nugget C Resin coating area S Protective structure (structure)

Claims (4)

Struts erected on the structure or ground; and
A plurality of conductive needles provided at the tip of the support column and arranged to extend radially;
A reinforcing member that is arranged so as to intersect with the conductive needles and is fixed across the two or more conductive needles;
A lightning protection device characterized by comprising: The lightning protection device according to claim 1, further comprising a stopper that fixes the conductive needle-like object and the reinforcing member to each other by being caulked and fixed to the conductive needle-like object and the reinforcing member. The lightning protection device according to claim 1 or 2, wherein the support column and the plurality of conductive needles are joined to each other by thermite welding. The lightning protection apparatus according to any one of claims 1 to 3, wherein the plurality of conductive needle-like objects are covered with a resin with a tip exposed.

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