JP5147532B2 - Inundation detection system and inundation detection method using this system - Google Patents

Description

The present invention relates to detecting water how using detecting water system and the system for detecting the water from entering the inside of the insulator waveguide made of an insulating material on the outer periphery of the metal pipe is coated.

  When a lightning surge current flows through a waveguide connecting the radio and the antenna, the radio and the like are damaged. Therefore, the waveguide is grounded with a grounding fitting.

  In general, a waveguide consists of a metal tube with corrugated irregularities formed on the tube wall and an insulator covering the outer periphery. When contacting the grounding metal, a part of the insulator is removed. The metal tube is exposed, and the ground metal fitting is brought into contact with the exposed metal tube. After that, wrap the self-adhesive tape or the like so as to cover the metal pipe part from which the insulator has been removed, the contact part of the grounding metal fitting, and a part of the insulator located on both sides of the exposed metal part. Waterproofing is applied so as not to contact the metal tube of the wave tube.

  However, if the self-adhesive tape or the like is only wound as described above, the waterproof performance is reduced due to cracks due to aging deterioration or adhesive strength reduction, and a gap is formed, and moisture such as rainwater may enter from the gap. When the infiltrated moisture is stored in the waveguide, there is a problem that the metal tube is corroded or a radio reception failure occurs.

  Accordingly, the present invention has been made in view of the above-described conventional problems, and is an inundation detection system and an inundation that can detect intrusion of moisture between a metal tube of a waveguide and an insulator. An object is to provide a detection method.

In order to achieve the above object, an inundation detection system according to the present invention is an inundation detection system for detecting inundation into an inside of an insulator of a waveguide in which an outer periphery of a metal tube is coated with an insulator, Carbon fiber paper is interposed between the outer periphery of the metal tube and the insulator, and electrical resistance or electrical conduction between the surface of the carbon fiber paper and the surface of the waveguide at one end of the waveguide Or measuring means for measuring electrical resistance or electrical conductivity between the surfaces of the carbon fiber paper at both ends of the waveguide (first invention).

  According to the inundation detection system of the present invention, since the carbon fiber paper is interposed between the metal tube and the insulator, moisture enters between the metal tube and the insulator due to damage of the insulator. The carbon fiber paper can also absorb the moisture. That is, water running in the longitudinal direction of the waveguide can be prevented.

  In addition, since the measuring means capable of measuring the electric resistance or electric conductivity of the carbon fiber paper is provided, the electric resistance becomes small when the carbon fiber paper interposed between the metal tube and the insulator absorbs moisture. By measuring the electrical resistance or electrical conductivity of the carbon fiber paper, and simultaneously monitoring the change in electrical resistance or electrical conductivity, It is possible to detect that moisture has entered during the period.

  Carbon fiber paper is easy to handle such as cutting and bending, and it does not take time and effort to cover the outer circumference of the metal tube with carbon fiber paper. It can be held to the same extent as a waveguide without fiber paper.

According to a second invention, in the first invention, there is further provided alarm means for issuing a warning by light, sound or the like when the degree of change of the electric resistance or the electric conductivity is larger than a predetermined degree. .
According to the inundation detection system of the present invention, when the degree of change in electrical resistance or electrical conductivity is greater than a predetermined level, the inundation detection system further includes alarm means for issuing a warning by light, sound, etc., so that moisture is insulated from the metal tube. It is possible to quickly grasp that it has entered the body.

According to a third aspect of the present invention, there is provided a water immersion detection method, comprising: a waveguide in which carbon fiber paper is interposed between an outer periphery of a metal tube and an insulator covering the metal tube; Electrical resistance or electrical conductivity between the surface of the carbon fiber paper and the surface of the waveguide at one end of the tube, or electrical resistance between surfaces of the carbon fiber paper at both ends of the waveguide, or And measuring the electrical resistance or the electrical conductivity using an inundation detection system comprising a measuring means for measuring electrical conductivity, and the degree of change in the electrical resistance or the electrical conductivity is greater than a predetermined degree. In this case, moisture is infiltrated between the metal tube and the insulator.
According to the water immersion detection method according to the present invention, utilizing the fact that the carbon fiber paper interposed between the metal tube and the insulator absorbs moisture, the electrical resistance is reduced or the electrical conductivity is increased, By measuring the electrical resistance or electrical conductivity of the carbon fiber paper and simultaneously monitoring the change in electrical resistance or electrical conductivity, it is possible to detect that water has entered between the metal tube and the insulator. .

  By using the water immersion detection system and the water immersion detection method of the present invention, it is possible to detect the intrusion of moisture between the metal tube of the waveguide and the insulator.

  Hereinafter, a preferred embodiment of an inundation detection system according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic view showing an inundation detection system 1 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a waveguide 2 used in the inundation detection system 1.
As shown in FIG. 1, a radio 4 installed in a radio room 3 on the ground and an antenna 6 attached to a steel tower 5 are connected by a waveguide 2 for feeding microwaves. Yes. The infiltration detection system 1 is a system that detects intrusion of moisture between the metal tube 7 of the waveguide 2 and the insulator 16 that covers the outer periphery thereof.
The waveguide 2 is grounded by the grounding metal fitting 12 so as to discharge a lightning surge current generated when lightning falls on the steel tower 5 to the ground.

As shown in FIG. 2, the waveguide 2 covers the metal tube 7 with corrugated irregularities formed on the tube wall and the outer periphery of the metal tube 7 without any gap, and is in close contact with the outer peripheral surface. It is comprised from the carbon fiber paper 8 adhere | attached with an adhesive agent etc., and the insulator 16 provided so that the outer periphery of this carbon fiber paper 8 may be covered.
In the present embodiment, for example, carbon fiber paper 8 manufactured by Awa Paper Co., Ltd., whose electrical resistance is about ½ of the dry state when moisture is absorbed, is used.

  FIG. 3 is an enlarged view showing the vicinity of the connecting portion between the waveguide 2 and the wireless device 4. As shown in FIG. 3, the end of the waveguide 2 on the radio device 4 side is connected to the radio device 4 via a plug 17. At this end, a portion 18 where the carbon fiber paper 8 is exposed by removing the insulator 16 and a portion 19 where the end of the carbon fiber paper 8 is further removed and the metal tube 7 is exposed are formed. The portion 19 where the metal tube 7 is exposed is inserted into the plug 17.

  The inundation detection system 1 includes a measuring unit 9 that measures the electrical conductivity of the carbon fiber paper 8 and an alarm unit 11 that issues a warning by light, sound, etc. when the degree of change in electrical conductivity exceeds a predetermined level. Prepare.

  The measuring means 9 includes a voltage applying device 13 that applies a voltage between the portion 18 where the carbon fiber paper 8 is exposed and the portion 19 where the metal tube 7 is exposed, and the applied voltage and the applied voltage. 8 and a measuring device 10 that measures electric conductivity based on the value of current flowing through the metal tube 7. The voltage applying device 13 and the measuring device 10 are installed in the radio equipment room 3 on the ground.

  The voltage applying device 13 includes a metal tube 7 via a conductor 14 wound around a portion 18 where one end of the carbon fiber paper 8 is exposed and a conductor 15 wound around a portion 19 where the one end exposes the metal tube 7. A constant voltage can be applied between the carbon fiber paper 8 and the carbon fiber paper 8.

  The measuring device 10 is connected in the middle of the conducting wire 14 and measures the electrical conductivity of the carbon fiber paper 8 based on the current flowing through the conducting wire 14 and the applied voltage. Further, the measuring device 10 is connected to an alarm means 11 that issues a warning by light, sound, etc. when the degree of change in electrical conductivity is greater than a predetermined degree.

  Then, the outer periphery from the end of the plug 17 on the side of the waveguide 2 to the end of the plug 16 on the side of the plug 17 is self-fused so as to completely cover the exposed portion 18 of the carbon fiber paper 8. The insulating part 20 is formed by winding a tape to prevent moisture from entering the connecting part.

  In the immersion detection system 1 having the above-described configuration, when moisture enters between the metal tube 7 and the insulator 16 of the waveguide 2, the moisture is absorbed by the carbon fiber paper 8 and the electric resistance of the carbon fiber paper 8. Decreases and the electrical conductivity increases. Therefore, when the amount of change in the electrical conductivity of the carbon fiber paper 8 measured by the measuring device 10 becomes larger than a predetermined degree, an alarm is given that water has entered between the metal tube 7 and the insulator 16. An alarm is issued by means 11. Note that the amount of change in electrical conductivity, which is a predetermined degree, is a value that varies depending on each site and is determined by design or the like.

  Hereinafter, for example, a description will be given of a water immersion detection method in the case where water enters from a portion where the grounding metal 12 is connected to the waveguide 2.

  FIG. 4 is a conceptual diagram illustrating an example of a change in electrical conductivity when moisture enters between the metal tube 7 and the insulator 16 due to, for example, heavy rain or a typhoon.

  As shown in FIG. 4, when moisture enters between the metal tube 7 and the insulator 16 from the portion where the ground metal fitting 12 is connected, the moisture is absorbed by the carbon fiber paper 8 and the electrical conductivity is rapidly increased. To rise. Then, when the electric conductivity is dry, that is, when the electric conductivity increases by more than the predetermined degree as compared with the normal time, it is detected that moisture has entered between the metal tube 7 and the insulator 16.

  Moreover, in this embodiment, the case where the variation | change_quantity (S / m) of electrical conductivity was used as a method of determining whether the water | moisture content permeates between the metal pipe 7 and the insulator 16 was demonstrated. However, the present invention is not limited to this. For example, the rate of change in electrical conductivity (ΔS / S, where ΔS: the amount of change in electrical conductivity from the electrical conductivity during drying of the carbon fiber paper 8 (S / M), S: electric conductivity (S / m) when the carbon fiber paper 8 is dried), and a change gradient of electric conductivity (ΔT / Δt, where ΔT: electricity when the carbon fiber paper 8 is dried The amount of change in electrical conductivity from conductivity (S / m), Δt: electrical conductivity measurement time interval (seconds) may be used.

  Next, different embodiments of the method for measuring electrical conductivity in the present invention will be described. In the following description, portions corresponding to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.

FIG. 5 is a schematic view showing the inundation detection system 22 according to the second embodiment of the present invention.
As shown in FIG. 5, the voltage application device 13 of the inundation detection system 22 includes an antenna lead 24 connected at one end to the antenna 6 side end of the waveguide 2, and the radio 4 having one end of the waveguide 2. A constant voltage can be applied between the metal tube 7 and the carbon fiber paper 8 through the radio conductor 25 connected to the side end.

  FIG. 6 is an enlarged view showing the vicinity of the connection portion between the waveguide 2 and the antenna 6. As shown in FIG. 6, the antenna conductor 24 is wound around a portion 18 where the carbon fiber paper 8 is exposed by removing the insulator 16 at the end of the waveguide 2 on the antenna 6 side.

  FIG. 7 is an enlarged view showing the vicinity of the connection portion between the waveguide 2 and the wireless device 4. As shown in FIG. 7, the radio conductor 25 is wound around a portion 18 where the carbon fiber paper 8 is exposed by removing the insulator 16 at the end of the waveguide 2 on the radio 4 side.

By applying a voltage between the carbon fiber paper 8 at the end portion on the antenna 6 side and the carbon fiber paper 8 at the end portion on the radio device 4 side, a current is applied to the carbon fiber paper 8 and the metal tube 7. pass.
The measuring device 10 is connected in the middle of the antenna conductor 24 and measures the electrical conductivity of the carbon fiber paper 8 based on the current flowing through the antenna conductor 24 and the applied voltage.

  According to the inundation detection systems 1 and 22 in each embodiment described above, since the carbon fiber paper 8 is interposed between the metal tube 7 and the insulator 16 of the waveguide 2, the insulator 16 is damaged. Even if moisture enters between the metal tube 7 and the insulator 16 due to the above, the carbon fiber paper 8 can absorb the moisture. That is, water running in the longitudinal direction of the waveguide can be prevented.

  In addition, since the measuring device 10 capable of measuring electrical conductivity is provided, the electrical conductivity increases when the carbon fiber paper 8 interposed between the metal tube 7 and the insulator 16 absorbs moisture. By measuring the electrical conductivity and monitoring the change in electrical conductivity, it is possible to detect that moisture has entered between the metal tube 7 and the insulator 16.

  Further, since the alarm means 11 is provided to issue a warning by light, sound or the like when the degree of change in electrical conductivity is greater than a predetermined degree, moisture can be quickly infiltrated between the metal tube 7 and the insulator 16. I can grasp it.

  In each of the above-described embodiments, the method of measuring the electrical conductivity with the measuring device 10 and detecting the intrusion of moisture between the metal tube 7 and the insulator 16 has been described. However, the present invention is not limited to this. Instead of this, the electrical resistance may be measured by the measuring device 10 to detect the intrusion of moisture between the metal tube 7 and the insulator 16. In this method, the electrical resistance of the carbon fiber paper 8 is measured by utilizing the fact that the electrical resistance decreases when the carbon fiber paper 8 interposed between the metal tube 7 and the insulator 16 absorbs moisture. The change in the electrical resistance is monitored, and when the amount of change in the electrical resistance is greater than a predetermined degree, it is determined that moisture has entered between the metal tube 7 and the insulator 16.

It is the schematic which shows the inundation detection system which concerns on 1st embodiment of this invention. It is sectional drawing of the waveguide used for an inundation detection system. It is an enlarged view which shows the connection part vicinity of a waveguide and a radio | wireless machine. It is a conceptual diagram which shows an example of the change of electrical conductivity. It is the schematic which shows the inundation detection system which concerns on 2nd embodiment of this invention. It is an enlarged view which shows the connection part vicinity of a waveguide and an antenna. It is an enlarged view which shows the connection part vicinity of a waveguide and a radio | wireless machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inundation detection system 2 Waveguide 3 Radio equipment room 4 Radio equipment 5 Steel tower 6 Antenna 7 Metal pipe 8 Carbon fiber paper 9 Measuring means 10 Measuring apparatus 11 Alarm means 12 Grounding metal fitting 13 Voltage application apparatus 14, 15 Conductor 16 Insulator 17 Plug part 18 Exposed carbon fiber paper 19 Exposed metal pipe part 20 Insulating part 22 Inundation detection system 24 Antenna conductor 25 Radio equipment conductor

Claims (3)

An inundation detection system for detecting inundation into the inside of the insulator of a waveguide formed by coating an insulator on the outer periphery of a metal tube,
Carbon fiber paper is interposed between the outer periphery of the metal tube and the insulator, and electrical resistance or electricity between the surface of the carbon fiber paper and the surface of the waveguide at one end of the waveguide. An inundation detection system comprising a measuring means for measuring conductivity or electrical resistance or electrical conductivity between surfaces of the carbon fiber paper at both ends of the waveguide .   2. The inundation detection system according to claim 1, further comprising alarm means for issuing a warning by light, sound or the like when the degree of change in the electric resistance or the electric conductivity is greater than a predetermined degree. Carbon fiber paper is interposed between the outer periphery of the metal tube and the insulator covering the metal tube, and a waveguide that feeds microwaves, and the carbon fiber paper at one end of the waveguide . Measuring means for measuring the electrical resistance or electrical conductivity between the surface and the waveguide surface, or the electrical resistance or electrical conductivity between the surfaces of the carbon fiber paper at both end positions of the waveguide ; Using the inundation detection system provided,
When the electrical resistance or the electrical conductivity is measured and the degree of change in the electrical resistance or the electrical conductivity is greater than a predetermined level, moisture has entered between the metal tube and the insulator. An inundation detection method characterized by the above.

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