JP2011249959A - Water immersion resistance structure of antenna unit with cover protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for a cover protector of an antenna unit which can maintain higher water immersion resistance for years because in a cover protector the pressing force of a packing is loosened to generate water immersion easily due to secular change, and which can allow for easy assembly and removal.SOLUTION: A structure for a cover protector of an antenna unit comprises: a first packing having a cutting part for drainage in the bottom bonded to a flange part around the cover protector of the antenna; a second packing having an open end in the lower side of the outer periphery one size smaller than the first packing so that there is a certain gap between the second packing and the first packing bonded to a reflection board; and multiple coupling means to compress the cover protector and the reflection board by holding parts of the ends of the first packing and the second packing. Thus, high water immersion resistance can be obtained.

Description

  The present invention provides a transmitting antenna device in which an antenna unit provided with an antenna element such as a double-loop antenna is attached to a reflector, and a protective cover for protecting the antenna element of the antenna unit from wind and rain or snow is provided. It relates to a water-resistant structure.

  For transmission antennas used in terrestrial digital broadcasting, antenna units composed of twin-loop antennas, etc. are installed around steel towers, regardless of whether they are horizontal plane omnidirectional or directional. Arranged on multiple sides, the directivity is multi-sided. (For example, refer to Patent Document 1).

  FIG. 5 is a top view showing a main part of a multi-sided composite antenna in which antenna units are arranged in multiple faces around the upper part of the tower. In FIG. 5, 11 is an antenna support mechanism provided near the upper part of the steel tower, and a plurality of, for example, four antenna units 12a, 12b,. In this case, the antenna units 12a, 12b,... Are arranged so as to be positioned at equal intervals around the steel tower, and the directivity is multifaceted.

  As the antenna units 12a, 12b,..., For example, a twin loop antenna is used. In this dual loop antenna, an antenna element composed of a loop element 14 is provided on each reflection plate 13, and a protective cover 15 is provided so as to cover the periphery of the loop element 14. Protects from snow and other inundation.

JP 2001-185929 A

  As described above, conventionally, each antenna unit 12a, 12b,... Is provided with a protective cover 15 to protect the antenna elements against rain, snow, and the like. However, for water immersion between a reflector such as a double loop antenna and a protective cover, an elastic packing such as rubber is sandwiched between the outer periphery where the protective cover and the reflector are in contact, and the outer peripheral part is spaced at an appropriate interval. The bolts and nuts are fastened at a constant pressure and the packing is pressed to prevent water from entering. Between the above-mentioned reflecting plate and the fastening portion formed by the bolts and nuts of the protective cover, the pressure on the packing is easy to loosen due to secular change or the like, and water is likely to be flooded at this position. In recent years, the antenna element structure has become more and more delicate and complicated due to the high performance of the antenna unit, etc., and higher protection against water is required for the protective cover of the antenna than in the past. That is, there is a need for a protective cover for an antenna that can maintain a high level of water resistance over time and can be easily assembled and removed.

According to a first aspect of the present invention, in the antenna unit with a protective cover, the reflector of the antenna unit, the protective cover for protecting the antenna element provided on the reflector, the flange portion provided around the protective cover, and the flange A first gap is provided between the first packing and a plate-like first packing that surrounds the periphery of the protective cover and has a cutting portion for draining water at a lower portion thereof. A plate-like second packing having an inverted U-shape that is slightly smaller than the inner shape of the packing, and the protective cover and the reflecting plate at the same time on the inner ends of the first packing and the second packing. A water-resistant structure comprising a plurality of fastening means around the antenna unit to be sandwiched and pressed is provided.
According to a second invention, in the antenna unit with a protective cover according to the first invention, the first packing is affixed to a flange portion of the protective cover, and the second packing is affixed to a reflector. And
According to a third invention, in the antenna unit with a protective cover according to the first or second invention, the plate thickness of the second packing is larger than the plate thickness of the first packing.

ADVANTAGE OF THE INVENTION According to this invention, the water resistant structure of the antenna unit which can maintain the water resistance of the protection cover of the antenna unit provided in the circumference | surroundings of a steel tower, and can perform maintenance of assembly, removal, etc. easily is implement | achieved.

It is explanatory drawing which shows the structure of the antenna unit concerning this invention. It is a figure which shows the structure of the protective cover concerning this invention. It is a figure which shows the structure of the reflecting plate concerning this invention. It is the figure which showed the detail of the attachment part of the protective cover and reflecting plate concerning this invention. It is a figure which shows the structure of the conventional antenna unit.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, a double loop antenna or the like provided on a reflector that is actually present is not shown because it is not necessary for the description of the present invention.

  FIG. 1 shows an embodiment of an antenna unit 1 according to the present invention, in which a protective cover 3 using fiber reinforced plastic (FRP) or the like is made of conductive material such as iron or aluminum by fastening means such as bolts 7 and nuts 8. The structure attached to the reflecting plate 2 using a metal plate is shown.

As shown in the drawing, the flange portion A that is press-contacted with the reflecting plate 2 provided around the protective cover 3 is provided with holes that penetrate the reflecting plate from the protective cover at appropriate intervals, as shown in FIG. Thus, the protective cover is attached to the reflector. As shown in FIG. 1, an elastic plate-like first packing 4 made of rubber or the like surrounds the periphery of the protective cover 3 on the side of the protective cover 3 that is in contact with the reflector A. It is affixed by adhesive means such as. The first packing 4 is provided with a drain cutting portion 6 at the lower position of the antenna unit 1 for draining water.

In addition, the reflector 2 is provided with a gap U between the first packing and an inverted U shape so that the lower side of the elastic second plate-like packing 5 such as rubber is opened. It is affixed to the shape. One end portion of the second packing is pressed by the flange portion A of the protective cover 3 to block water from entering the antenna unit.

As described above, the draining groove 6 of about 10 to 30 mm is provided at the lower position of the antenna unit of the first packing, so that rain or snow water submerged inside the protective cover should be removed from the groove. It can be discharged. Moreover, the 2nd packing affixed on the reflecting plate 2 with adhesive means, such as a double-sided tape or an adhesive agent, is formed in reverse U shape, and was formed between the 1st packing and the 2nd packing. The gap B forms a channel of water, and it penetrates the first packing 4 to become a passage for the infiltrated water and is discharged from the drain groove 6.

In the present embodiment, as described above, the two packing surfaces are made different from each other, that is, the first packing 4 is attached to the protective cover 3 to constitute a surface that suppresses water immersion with the reflecting plate. The packing 5 of 2 is affixed on the reflecting plate 2 and constitutes the flange portion A of the protective cover 3 and a surface that suppresses flooding. Even if the above two types of packing are bonded and fixed to one reflector 2, it is possible to obtain water resistance as a double-enclosed packing. In other words, the surface of the packing involved in water immersion should not be on the same plane. In other words, a higher water immersion effect can be obtained by bending the water immersion path.

  FIG. 2 is a view of the protective cover 3 according to the present invention. In FIG. 2, the first packing 4 attached to the protective cover 3 is indicated by hatching. Around the protective cover 3, a wide flange portion A for attachment to the reflecting plate is formed, and a plurality of holes 9a for inserting bolts are provided. The first packing is cut under the protective cover so that the drain groove 6 is formed.

FIG. 3 is a view of the reflector 2 according to the present invention. In FIG. 3, the second packing 5 attached to the reflecting plate 2 is indicated by hatching. Around the reflector 2, a plurality of holes 9 b for inserting bolts 7 for attaching the protective cover 3 are provided at positions corresponding to the holes 9 a of the protective cover 3. The second packing 5 is formed in an inverted U-shape with a flat plate, and the outer shape is slightly smaller than the inner shape of the first packing 4, and is equal to the thickness of the first packing 4 or preferably at least the first packing. The thickness of the packing 4 is about 3 to 10 mm thicker. As shown in FIG. 1, the second packing 5 is arranged and attached to the reflector 2 so as to form a gap B with the first packing 4.

By making the outer shape of the second packing 5 slightly smaller than the first packing 4, a gap B of about 3 to 10 mm is formed between the second packing 5 and the first packing 4. The water soaked from the water flows into the channel formed by the gap B so as not to enter the antenna. As shown in FIG. 1, the channel is configured to prevent water from entering the inside of the antenna unit, which is guided below the antenna and sealed with the second packing 5, and the portion where the antenna element is provided. . A detailed description including the gap B formed when the reflecting plate 2 and the protective cover 3 are integrated will be described later.

Reinforcing ribs 2a for reinforcing the reflecting plate 2 are provided on the back surface of the reflecting plate 2 as shown in FIG.

FIG. 4 is a diagram showing details when the protective cover 3 is attached to the reflection plate 2 according to the present invention.
Hereinafter, a description will be given with reference to FIG.

  As shown in FIG. 4, the first packing 4 and the second packing 4 are formed by bolts 7 and nuts 8 inserted into the holes penetrating the protective cover 3 and the reflector 2 at the position of the flange portion A of the protective cover 3. The outer peripheral end C of the packing 5 is simultaneously nipped and compressed and deformed by screw tightening to prevent water from entering the protective cover 3. At this time, the thickness of the second rubber packing 5 is formed to be at least thicker than that of the first rubber packing 4, and the end portion of the outer peripheral portion of the second packing 5 with respect to the compressed thickness of the first rubber packing. The portion C is further compressed and deformed to prevent water from entering the inside through the second rubber packing.

  As described above, a gap B of about 5 to 10 mm is formed between the first packing 4 and the second packing 5, and even if water enters through the first packing 4, the second 1 and is prevented from entering the inside of the antenna unit 1, and the infiltrated water flows downward through the gap B as a passage (channel). Drained from open area.

DESCRIPTION OF SYMBOLS 1 ... Antenna unit 2 ... Reflector 2a ... Reflector reinforcement rib 3 ... Protective cover 4 ... 1st packing 5 ... 2nd packing 6 ... Drain cutting part 7 ... Bolt 8 ... Nut 9a ... Bolt mounting hole for protective cover 9b ... Bolt mounting hole for reflector A ... Flange part B ... Gap C ... No. End of 2 packing

For transmission antennas used in terrestrial digital broadcasting, antenna units composed of twin-loop antennas, etc. are installed around steel towers, regardless of whether they are horizontal plane omnidirectional or directional. Arranged on multiple sides, the directivity is multi-sided. (E.g., patent document 21 to see.).

JP 2001-185929 A JP 2006-148555 A

Claims (3)

A reflection plate of the antenna unit; a protective cover for protecting the antenna element provided on the reflection plate; a flange portion provided around the protection cover; and surrounding the protective cover at the flange portion; An inverted U-shape that is slightly smaller than the inner shape of the first packing so as to obtain a certain gap between the plate-like first packing having a cutting portion for draining water and the first packing. And a plurality of fastening means around the antenna unit for simultaneously holding and compressing the protective cover and the reflection plate at the inner ends of the first packing and the second packing. An antenna unit with a protective cover, characterized by comprising a water-resistant structure consisting of   The antenna unit with a protective cover according to claim 1, wherein the first packing is attached to a flange portion of the protective cover, and the second packing is attached to a reflecting plate. 3. The antenna unit with a protective cover according to claim 1, wherein the plate thickness of the second packing is thicker than the plate thickness of the first packing.