JP2005129474A - Lightning protection device with both roles of preventing from leaf and bird - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightning protection device without being interfered by leaves and perching birds and hardly suffering from lightning. <P>SOLUTION: A lightning protection device with both roles of preventing itself from leaves and birds is to be electrically connected with a ground wire letting lightning current flow to the ground, a shield part of a shield wire covering a sensor cable for a raining sensor, a snowing sensor or the like, or a metal piping for letting a sensor cable pass through, and a cage-shape metal solid object. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention prevents acts such as a leaf sensor or snow sensor installed in the air or on a wall from being covered with leaves or a bird trapping, and protecting the rain sensor or snow sensor from lightning current. The present invention relates to a leaf-proof / bird-proof / lightning protection device.

  A method for applying an AC voltage between electrodes as a rain sensor or a snow sensor and detecting a change in current or capacitance between the electrodes is disclosed in Japanese Utility Model Laid-Open No. 64-30470. A method for mounting on an open / close control device is disclosed in Japanese Utility Model Publication No. 4-12897. Rain sensors and snow sensors based on this principle have a structure in which the electrode surface must be directed to the sky to receive rain and snow. It has been devised such as providing. In addition, the electrode surface of the rain sensor or snow sensor faces the sky, and a lightning current flows through this electrode surface and the sensor cable, and a control circuit that connects the rain sensor, snow sensor, etc. It was easily affected by destruction. In order to reduce the influence of this lightning current as much as possible, a device such as using a shielded cable for the sensor cable or passing the sensor cable through a metal pipe has been devised. However, even if the electrode surface of the sensor is coated with an insulator, the electrode surface of the sensor is exposed in the air without passing through a metal, so that damage due to lightning cannot be avoided.

Problems to be solved by the invention

  The type of rain sensor or snow sensor that is installed with the electrode surface facing the sky may cause the sensor to malfunction due to the foliage of birds that are covered with leaves or the birds tend to settle. However, there was a drawback that lightning current flowed into the sensor and destroyed the sensor body and the control circuit connecting the sensor. An object of the present invention is to provide a leaf-prevention / bird-proof / lightning arrester that is not covered with leaves and does not stop with birds, and is not easily damaged by lightning.

Means for solving the problem

In order to achieve the above object, the present invention provides the following configuration.
Covers a rain sensor, snow sensor, etc., with one or more pointed needles, all or part of which is mesh-shaped, which is sufficient for raindrops and snowsides to pass through and leaves of trees Cage-shaped metal solid object with a gap that is not large, a ground wire that sends lightning current from the cage metal solid object to the ground, and a shield part or sensor cable of a shield wire that covers sensor cables such as rain sensor and snow sensor A metal pipe through which the solid metal object and the shield part or metal pipe and the ground wire are electrically connected, and even if a lightning strike occurs at any part of the electrical connection, By supplying a lightning current to the ground through the wire, it is possible to protect the sensor main body and the control circuit connecting the sensors arranged inside the cage metal solid object. Further, by sufficiently sharpening the tip of the cage-shaped metal three-dimensional object, it is possible to prevent birds from being caught and to prevent the leaves of trees from covering the surfaces of the rain sensor and the snow sensor.

A first embodiment of the present invention will be described based on an example with reference to FIGS. FIG. 1 is an overall view in the present embodiment, FIG. 2 is an external view of FIG. 1 formed into a curve, and FIG. 5 is a cross-sectional view of a cage-shaped metal solid object.
In FIG. 1, 1 is a sensor unit such as a rain sensor or a snow sensor, 2 is a cage metal solid object, 3 is a metal pipe, and 4 is a ground wire.
In FIG. 5, 5 is a raindrop, 6 is a sensor electrode, 7 is a leaf, and 8 is the shortest distance between the sensor electrode 6 and the cage-shaped metal three-dimensional object 2.
The sensor unit 1 is provided with one or more pointed needles, and all or a part of the mesh is a mesh, and the mesh has a gap that is large enough to allow raindrops and snowsides to pass therethrough and does not allow leaves to enter. The metal pipe 3 is installed inside the cage-shaped metal solid object 2, the metal pipe 3 is connected to the cage-shaped metal solid object 2, and the sensor cable is electrically shielded through the metal pipe 3. Instead of the metal pipe 3, a shield wire may be used for the sensor cable, and the cage-shaped metal solid object 2, the shield portion of the shield wire, and the ground wire 4 may be electrically connected. It is desirable that the tip of the cage-shaped metal solid object 2 is sufficiently sharpened and that the inclination angle of the outer side of the cage-shaped metal solid object 2 is provided with a gradient of 45 degrees or more so that birds do not stop. One of the ground wires 4 is connected to the metal pipe 3 and the other is connected to the ground.
As shown in FIG. 5, the mesh size of the cage-shaped metal solid object 2 has a gap through which raindrops 5 and snowsides pass sufficiently, and the raindrops 5 and snowsides reach the sensor unit 1 to reach the rain sensor and Snow sensor etc. operate normally. At the same time, the size of the mesh of the cage-shaped metal three-dimensional object 2 must be such that the leaves 7 do not enter. The shortest distance 8 between the sensor electrode 6 and the cage-shaped metal solid object 2 is at least 10 mm or more because a lightning current does not flow to the sensor electrode 6 due to dielectric breakdown in the air from the cage-shaped metal solid object 2 during a lightning strike. It is necessary to secure.

  The operation will be described. During normal operation, the sensor unit 1 operates by detecting raindrops 5 and snow edges that have arrived through the gap between the cage-shaped metal three-dimensional object 2, and at the same time, the birds crawl over the sharp tip of the cage-shaped metal three-dimensional object 2. The cage-like metal solid object 2 prevents the leaves 7 and the like from covering the sensor unit 1 and causing a malfunction. During lightning strikes, even if lightning strikes any of the cage-shaped metal solid object 2, the metal pipe 3, and the ground wire 4, the lightning current flows to the ground through the ground wire 4, and the rain sensor, lightning sensor, etc. It is possible to protect a control circuit that connects a sensor, a snow sensor, and the like.

Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 3 is an external view of the cage-shaped metal three-dimensional object 2 in the present embodiment. In FIG. 3, 9 is a punching metal, 10 is a metal net, and 11 is a metal bird guard. The sensor unit 1 is installed inside. In FIG. 3, the cage-shaped metal solid object 2 is configured as a rectangular parallelepiped in consideration of ease of manufacture. The side surface of the cage-shaped metal solid object 2 is composed of a punching metal 9, a metal net 10 is arranged on the upper surface, and metal bird guards 11 are provided at four corners. The gap space between the punching metal 9 and the metal net 10 is not less than a size that allows the raindrops 5 and snowsides to pass sufficiently and not so large that the leaves 7 do not enter. Since the cage-shaped metal solid object 2 is a rectangular parallelepiped, it has a shape that makes it easy for birds to stop. Metal bird guards 11 are provided at the four corners, but the metal bird guards 11 may be further increased, or the sensor unit. When 1 is 50 mm square or less, the metal bird guard 11 may be reduced. In the embodiment of FIG. 3, any combination of the punching metal 9 and the metal net 10 may be adopted for the side surface and the upper surface of the cage-shaped metal solid object 2.

Next, a third embodiment of the present invention will be described with reference to FIG.
FIG. 4 is an external view of a cylindrical cage metal solid object 2 in which a sensor unit 1 such as a rain sensor or a snow sensor is guided by a rain collecting snow funnel. In FIG. 4, 12 is a side part of a cylinder. In FIG. 4, the cage-shaped metal solid object 2 is configured as a cylindrical shape in consideration of ease of manufacture. The cylindrical side surface portion 12 may be formed with a hole so as to ensure air permeability, or may be formed so as to be covered without forming a hole. A metal net 10 was arranged on the upper surface, and metal bird-proof needles 11 were provided at four locations. The gap space of the metal net 10 is not less than a size that allows raindrops 5 and snow sides to pass sufficiently, and not more than a size that does not allow the leaves 7 to enter. Since the cage-shaped metal solid object 2 has a cylindrical shape, it has a shape that makes it easy for birds to stop. Metal bird guards 11 are provided in four places, but the metal bird guards 11 may be further increased. When the diameter of the cylinder is as small as 100 mm or less, the number of metal bird protection needles 11 may be reduced.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 6 is an external view of the cage-shaped metal three-dimensional object 2 when a rain sensor, a snow sensor, or the like is installed vertically. In order to make it easy to grasp the overall positional relationship, in FIG. 6, only four skeletons of the cage-shaped metal three-dimensional object 2 and the needle portion at the tip are drawn. As in the first embodiment, the cage-shaped metal three-dimensional object 2 is The gap space is configured in a mesh shape and is not larger than a size that allows raindrops 5 and snowsides to sufficiently pass through and smaller than a size that does not allow the leaves 7 to enter.

The invention's effect

  ADVANTAGE OF THE INVENTION According to this invention, a bird does not stop without being covered with a leaf, and it can provide the leaf prevention / bird protection / lightning arrester which is hard to be damaged by thunder at low cost.

1 is an overall view according to a first embodiment of the present invention. The external view of the cage-shaped metal solid object made into the curve design in the 1st Embodiment of this invention. The external view of the cage-shaped metal solid object in the 2nd Embodiment of this invention. The external view of the cage-shaped metal solid object in the 3rd Embodiment of this invention. Sectional drawing of a cage-shaped metal solid object. The external view of the cage-shaped metal solid object in the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sensor part 2 Cage-like metal three-dimensional object 3 Metal piping 4 Ground wire 5 Raindrop 6 Sensor electrode 7 Leaf 8 Shortest distance 9 Punching metal 10 Metal net 11 Metal bird guard 12 Side part of cylinder

Claims (4)

  A cage-like metal having one or more pointed needles, all or part of which is mesh-shaped, with a mesh that is large enough for raindrops and snowsides to pass therethrough and does not allow leaves to enter In a three-dimensional object, a device that protects the rain sensor, snow sensor, etc. from lightning currents during lightning strikes by preventing the rain sensor or snow sensor, etc., stored in the cage-like metal three-dimensional object from being covered with leaves or birds A leaf-proof / bird-proof / lightning arrester, wherein a ground wire is connected to cause a lightning current to flow from the cage-shaped metal solid object to the ground during a lightning strike.   The leaf-proof / bird-proof / lightning arrester according to claim 1, wherein a shield part of a shield wire through which a power source and a signal line such as a rain sensor and a snow sensor pass is connected to the cage metal solid object.   2. The leaf-proof / bird-proof / lightning arrester according to claim 1, wherein a metal pipe for passing a power source and a signal line such as the rain sensor and the snow sensor is connected to the cage metal solid object.   The leaf-proof / bird-proof / lightning arrester according to claim 2 or 3, wherein a tip of the three-dimensional cage-shaped metal object faces upward when the rain sensor, the snow sensor, or the like is installed vertically.

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