JP5964656B2 - Leak detection line - Google Patents

Description

  The present invention relates to a leak detection line for detecting leaks during storage and transportation of water leaks and chemicals inside a building.

In the case of computer rooms, storage rooms for various materials, etc., if water adheres to or leaks from the walls, floors, various equipment surfaces, pipe joints, etc. inside the building, it may cause corrosion of the building floors, etc. , Various devices may malfunction, and the materials may be altered. In addition, when various liquids such as chemicals such as water, sulfuric acid, and hydrochloric acid are stored or transported, leakage of the liquid causes economic loss and accidents.
For this reason, as a means for detecting water leakage or leakage (hereinafter referred to as “leakage”), a leak detection line is attached to the wall surface or the like inside the building to detect the leak. Has been done.

As the liquid leakage detection line, for example, as shown in FIG. 7, a pair of conductors (electrodes) 1 and 1 are respectively covered with a braid 2 and a colored yarn (coloring body) 3 is placed along the coated electrode 1 There is P ′ whose outer peripheral surface is further covered with an external braid 4 (patent document 1 utility model registration claim page 2 left column (third column) line 22 to right column (fourth column) line 42, (See FIG. 1).
When leakage occurs, the braids 2 and 4 capture the leakage and short-circuit the conductors 1 and 1 through the leakage (resistance between the conductors 1 and 1). The liquid leakage is detected by an electrical signal due to the short circuit (change). At this time, since both the braids 2 and 4 reliably capture the liquid leakage, the detection accuracy is high. Further, since the colorant of the color developing yarn 3 is dissolved by the liquid leakage and oozes out to the external braid 4, the leaked portion can be confirmed by checking the colored (colored) external braid 4.

  Further, there is also a liquid leakage detection line P ′ shown in FIG. 7 in which the outer braid 4 is transmitted by liquid absorption without the coloring yarn 3 being lined (see FIG. 3). When leakage occurs, the leakage detection line P ′ similarly causes both braids 2 and 4 to capture the leakage and short-circuit between the conductors 1 and 1 via the leakage (conductors 1 and 1). And the leakage is detected by an electrical signal due to the short circuit (change). At this time, since the inner braid 2 is colored and the outer braid 4 permeates when it absorbs liquid, the color of the inner braid 2 shows through and the leakage position can be confirmed (Patent Document 2 Utility Model Registration Request) Range, see Figure 2 etc.)

Japanese Utility Model Publication No.59-155536 Japanese Utility Model Publication No. 01-89351 JP 2002-277341 A

The liquid leakage detection line P ′ along the coloring yarn 3 is wetted by rain or the like until it is laid, or liquid leakage occurs, and once the colorant oozes out, the external braid 4 is colored. There is a problem that does not recover to the state that is not.
On the other hand, even if the liquid leakage detection line P ′ colored the inner braid 2 gets wet due to rain or leaks, if the liquid dries, the permeation of the external braid 4 is eliminated, and the liquid leak Return to detection status.
However, conventionally, the inner braid 2 is colored with, for example, one color of red or blue, and the color of the inner braid 2 is not sufficiently identified by the permeation of the outer braid 4 by liquid absorption. In many cases, the color of the inner braid 2 appears to be thin as a whole, so that the liquid leakage itself cannot be recognized. This tendency is prominent when the installation environment is dark.

  An object of the present invention is to make it easy to confirm the coloring of the coating at the time of leakage in the leakage detection line in which the coating of the detection conductor is colored under such a situation.

In order to achieve the above object, the present invention makes the coloring of the coatings of the plurality of detection conductors different.
If the color of each coating is different, the color of each coating will be clearer when the external braid is permeated by the liquid leakage than when it is not transparent before the liquid leakage. It is different and the leak position can be recognized.

According to the configuration of the present invention, at least two conductors are respectively coated and arranged in parallel, and the outer circumference of the coated conductor is covered with an outer braid that penetrates ( shows through ) the liquid during absorption, and the outer braid is absorbed. in leak detection line whose resistance value changes between the conductors by the liquid, it is possible to adopt a configuration which has been subjected to respective different colored coating of said respective conductors.

The conductor coating can be a braid, and in the case of a braid, it becomes liquid-permeable, and the fiber yarn of the braid may be either hygroscopic (hydrophilic) or non-hygroscopic (water repellent), but non-hygroscopic In that case, the liquid can be held in the gaps of the braid by making the braid sparse (can be liquid-permeable). The external braid may be any yarn as long as it is permeable by liquid absorption.
The fiber yarns of the conductor braid and the external braid are, for example, cotton yarn, polyester such as fluororesin (PFA), polypropylene (PP), polyphenylene sulfide (PPS), polyethylene (PE), polyethylene terephthalate (PET), and polyvinyl alcohol. Organic or inorganic compounds such as (PVA) and nylon (NY) can be appropriately employed. In addition, either a non-hygroscopic material or a hygroscopic material may be used. However, when importance is attached to the point that washing and drying can be performed after leakage detection and the liquid can be quickly recovered, it is preferable to use a non-hygroscopic material. Furthermore, either monofilament or multifilament can be adopted. At this time, when a braid is formed by interweaving a material with high water repellency such as fluororesin and a material with high moisture absorption such as cotton yarn, the liquid leakage to this braid is changed by changing the ratio of the interweaving. It is also possible to adjust the ease of penetration.

  The conductor braid can be colored by dipping the fiber yarn in a coloring tank and coloring it, and then forming the colored yarn into a braid, or after forming the braid, dipping the braid in the coloring tank and coloring. At this time, the coloring is preferably insoluble. If it is insoluble, it will not melt into the external braid even if it touches the leaked liquid, and if the external braid dries, it will return to its original state, and re-detection is possible.

  Any material may be used for the conductor as long as it is conventionally used. For example, it is a stranded wire such as tin plating, a single wire, a flat wire, etc. The material is not limited to metal and has conductivity. In this case, a non-metal, carbon fiber, or the like may be used, but a stranded wire is preferable if the flexibility is important. The parallel spacing between the conductors (the thickness of the internal braid, etc.) is appropriately determined by experiments and the like in consideration of detection accuracy.

The number of conductors may be any as long as it is two or more, but if it is three, one of the conductors may be used as a detection line for the leak position (see Patent Document 2, page 7, line 6 and subsequent [ Embodiment 3] (See FIGS. 4 and 5) In the case of a leak detection line in which the conductors are arranged in a flat shape, the leak detection range can be widened (see Patent Document 3 FIGS. 1 to 5). ).
When there are two conductors, the color of the coating can be any one of red, blue, and yellow. At this time, one of them can be yellow and the other can be red or blue. When there are three conductors, the color of each coating can be different from yellow, red, or blue, respectively . This is because red or blue is easy to recognize, and yellow makes red or blue stand out (see embodiment below).
If each coated conductor is twisted, it is easier to recognize that the color of each coated conductor is spirally recognized in the length direction of the leak detection line and that the leak has occurred. (See the embodiment below).

  In the present invention, as described above, the coating of each conductor is colored differently. Therefore, when leakage occurs, it becomes easy to recognize the coated conductor through the external braid due to the leakage. For this reason, it is easy to confirm the leak position.

Sectional drawing of one Embodiment of this invention Partial perspective view of the same embodiment Cross-sectional view of another embodiment It is an effect | action figure of Examples 1-4 and a comparative example, (a) is before leaking, (b) is after leaking. It is the same action figure, (a) before leaking, (b) after leaking It is the same action figure, (a) before leaking, (b) after leaking Cross section of conventional example

FIGS. 1 to 3 show an embodiment of the present invention, and the leakage detection line P of this embodiment is made of a tinned annealed copper stranded wire (element diameter: 0.18 mm × 13 wires = 0.33 mm ² ). Two (FIG. 3) or three (FIGS. 1 and 2) conductors 11 are each covered with a cotton braid 12 to ensure insulation between the conductors 11, and the coated conductor 10 is twisted and the outer periphery thereof is removed. A multifilament white cotton yarn having a diameter of 0.1 mm and covered with an external braid 14 (outer diameter: about 4 mm).

The covering (braiding) 12 made of cotton yarn of each conductor 11 is colored with red, blue and yellow by mixing red, blue and yellow pigments in the cotton yarn, respectively. Examples 1 to 4 and comparative examples shown in FIGS. 4 to 6 were manufactured by the coated conductor 10 exhibiting red, blue, and yellow coloring.
Examples 1 to 3 are the liquid leakage detection lines P twisted by the two coated conductors 10 and 10 shown in FIG. 3, and in Example 1, the coating 12 of the coated conductors 10 and 10 is red and blue. Example 2 consists of the same red and yellow, and Example 3 consists of the same blue and yellow. Example 4 is a liquid leakage detection line P in which the three coated conductors 10 and 10 shown in FIGS. 1 and 2 are twisted, and the coating 12 of the coated conductors 10, 10, and 10 is made of red, blue, and yellow. Become. The comparative example is a liquid leakage detection line P in which the two covered conductors 10 and 10 shown in FIG.

Each liquid leakage detection line P of each of Examples 1 to 4 and the comparative example is shown in each (a) of FIGS. 4 to 6, and after the water is shown in (b). FIG. 5 shows a state under an incandescent light bulb flashlight in a dark room, and FIG. 6 shows a state under white LED illumination in a dark room.
In each test, when comparing each figure (a) and (b), in each figure (b), the leakage detection line P of the comparative example in which the coating 12 is made of the same color of red and red is entirely red. Although it is raised, it is difficult to tell where the leak occurred.
On the other hand, in each figure (b), the leak detection lines P of Examples 1 to 4 have red and blue, red and yellow, blue and yellow, and red and blue and yellow spiral patterns, respectively. The pattern (a) is clearly different from the above (a), and the liquid leakage position can be confirmed. This confirmation is also possible in the darkroom of FIGS. At this time, the degree of discrimination is clear in the order of the first embodiment, the same 2, the same 3, and the fourth.

  From this, it can be understood that the number of the covered conductors 10 is preferably three or more than two, and in the case of two, the degree of discrimination of the liquid leakage portion is in the order of red and blue, red and yellow, blue and yellow. Can be understood to increase. From this, it can be understood that yellow distinguishes red and blue to increase the degree of discrimination of the leaked portion. Further, the difference in the degree of identification of the leaked portion becomes more prominent as the darkness is reached.

In the above embodiment, the coating 12 is formed by braiding, but it may be a resin coating (coated conductor) such as a semiconductive resin. In addition to the red, blue, and yellow colors, the coating 12 may be green, black, and the like. Further, the glass pigment may be mixed with glass powder so that it shines through when wet, or a fluorescent material is mixed. You can also. Moreover, the conductor 11 can also be made into a single wire instead of a stranded wire, and the product made from carbon fiber can also be employ | adopted as an acid resistant (chemical-resistant) thing.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

P, P 'Leak detection line 1, 11 Conductor 2, 12 Cover (braided)
10 Coated conductors 4, 14 External braiding

Claims (1)

Three conductors (11) are parallel twisted while being respectively braids (12), by an external braid (14) exiting show-the outer periphery of the twisted coated conductor (10) during liquid absorption over the entire length A leakage detection line (P) that covers and changes the resistance value between the conductors (11) by liquid absorption of the external braid (14),
The liquid leakage detection line, wherein the color of the braided coating (12) of each conductor (11) is different from each other in yellow, red or blue.