JPH0222664Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a liquid leakage detection line that can detect liquid leakage and confirm the location of the liquid leakage.

Water, chemicals such as sulfuric acid, hydrochloric acid, crude oil, petroleum,
When storing and transporting various liquids such as gasoline and other oils, leakage can cause loss and accidents, and in the case of computer rooms, storage rooms for various materials, etc. , as there is a risk that various devices may malfunction or the materials may deteriorate.
It is necessary to detect leakage early and prevent losses and accidents. This liquid leakage detection generally uses a detection wire whose electrical characteristics change when liquid enters, but since it is an electrical detection, the appearance of the detection wire does not change at all, making it easy to locate the leakage point. was difficult. For example, in order to detect liquid leakage using a detection wire installed under the free access of a computer room and search for the leakage location, the floor must be turned over each time, but it is sometimes difficult to find the leakage point at a glance. In many cases, this was due to malfunction, and it was extremely troublesome.

For this reason, as described in Japanese Utility Model Publication No. 56-29734, a method has been devised in which a pulse wave is sent to a leakage detection line and the position of the leakage is detected based on the time it takes for the reflected wave to return.

However, this idea requires a separate device for transmitting and receiving pulse waves, resulting in high costs and, if leakage occurs at multiple locations, there is a problem in that the reflected waves mix and cannot be detected.

Therefore, the object of this invention is to make it possible to easily detect the leakage position by visual inspection.

In order to solve this problem, in this invention, in the conventional well-known liquid leak detection wire in which at least two electrode wires are covered with a jacket, the jacket is insoluble in the liquid to be detected. , and is composed of a braided body made of liquid-absorbing threads, and a liquid-soluble colored indicator is provided within the outer sheath along its entire length, and the color that oozes out when the colored indicator dissolves in the liquid is the same as the color of the outer sheath. A different configuration was adopted.

As the colored indicator, it is preferable to use a luminescent one.

In the liquid leakage detection line according to the present invention configured in this way, when liquid leaks at a certain point in the installation location, the liquid permeates into the outer cover and dissolves the colored indicator. The dissolved colored indicator oozes out onto the surface of the outer sheath, and the location of the leak can be confirmed by this exuded color, which is a different color from the surface of the outer sheath. At this time, even if the exudate dries, the coloring caused by the indicator remains, so there is no problem in checking for leakage.

If the colored indicator has luminescence, leakage can be confirmed regardless of the brightness or darkness of the installation location.

This invention will be described below based on embodiments shown in the accompanying drawings.

As shown in Figures 1 and 2, the electrode wires 1a and 1b are made of flexible conductors made by twisting together 30 annealed copper wires of 0.18 mmφ, and are braided with 200 denier monofilament polyethylene (6 wires are held together). The inner braid layers 2a and 2b are each coated with wire rods 3a and 3b, and these are covered with an outer braided layer 2a and 2b of 250 denier multifilament Tetoron yarn (6 threads and 16 threads). It is covered with a body layer 4. The wire rods 3a and 3b are impregnated with a liquid-soluble coloring agent, and the coloring agent is applied to the outer braided body layer 4.
The color has been selected to be different from that of the Therefore, when the liquid permeates through the outer braided layer 4, the coloring agent dissolved in the liquid oozes out to the surface of the outer braided layer 4, so that leakage can be confirmed by observing the surface of the outer braided layer 4. Note that even if the liquid dries after leakage, the coloring agent remains on the surface, so there is no problem in checking for leakage.

In the embodiments described above, the wire rods 3a and 3b may be formed by solidifying a coloring agent into a linear shape, or may be formed by solidifying a coloring agent into a wire such as thread, string, or paper tape. Moreover, a luminescent coloring agent can be used.
Note that it is desirable to use an indicator that has almost no effect on the electrical characteristics of the leakage detection wire.

Furthermore, the threads constituting the internal braided body layers 2a and 2b are not limited to polyethylene threads, but may be made of non-hygroscopic synthetic fibers such as polyethylene, polypropylene, Tetron, nylon, etc. Preferably. The yarn constituting the outer braided body layer 4 is preferably one having a liquid-absorbing structure such as a multifilament yarn or a spun yarn that easily conducts liquids such as water through capillary action, and the material thereof is not particularly limited. Moreover, the electrode wire 1a,
It goes without saying that 1b is not limited to the annealed copper stranded wire.

Next, to explain another example of this invention, as shown in FIG. 3, a spacer 5 made of an insulator such as synthetic resin and having a substantially elliptical cross section has electrode notches formed at both ends of its long axis. Electrode wires 1a, 1 are placed in the notches 6a, 6b.
A wire rod 8 that supports the wire rod b and has a liquid-soluble indicator in wire rod notches 7a and 7b formed at both ends of the short axis.
a, 8b are supported and covered by a braided body layer 9. This braided body layer 9 is the inner braided body layer 2.
A or the outer braided layer 4, or a double structure of an inner braided layer and an outer braided layer. In the case of an inner braided layer and an outer braided layer, the wires 8a and 8b may be provided either between the inner braided layer and the outer braided layer or between the inner braided layer and the spacer 5. Note that the shape of the spacer may be other than an ellipse, such as a circle or a rectangle.

In order to confirm the effect of this invention, in the example shown in Fig. 1, leakage detection wires were created using cotton threads dyed with water-soluble paint as the wires 3a and 3b, and water droplets were dropped onto the wires. As a result, the color oozed out onto the surface of the outer braided layer 4.

In addition, we use fluorescent whitening dye “Keikol” for water-soluble paints.
A leakage detection wire was created using wire rods 3a and 3b in which cotton thread was dyed with a small amount of "BB" (trade name of Nisso Kako Co., Ltd.) mixed therein. When water droplets were dropped on this, the color oozed out onto the surface of the outer braided body layer 4 in the same manner as described above. Then, lay this colored area in a dark place, such as under a free access area, and use a fluorescent light.
When I illuminated it with FL20SBLB (manufactured by Tokyo Shibaura Electric Co., Ltd.), it emitted light and was immediately discovered.

As described above, this device has a colored indicator inside the leakage detection line that detects liquid leakage, so if the liquid penetrates from the surface of the leakage detection line, the indicator dissolves and appears on the surface of the liquid leakage detection line. Because it appears, by visual inspection,
This has the advantage that leakage points can be easily confirmed.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing one example of this invention, FIG. 2 is a sectional view of FIG. 1, and FIG. 3 is a sectional view showing another example of this invention. 1a, 1b...electrode wire, 2a, 2b...inner braided body layer, 3a, 3b, 8a, 8b...wire rod, 4...
...Outer braided body layer, 5...Spacer, 6a, 6b,
7a, 7b...notch, 9...braided body layer.

Claims (1)

[Claims for Utility Model Registration] (1) In a liquid leakage detection wire in which at least two electrode wires are covered with a jacket, the jacket is liquid-insoluble and liquid-absorbing for the liquid to be detected. It consists of a braided body made of yarn, and a liquid-soluble colored indicator is provided within its outer covering along its entire length, and the exuded color of this colored indicator when dissolved in the liquid is different from the color of the outer covering. Characteristic leakage detection line. (2) Utility model registration claim No. (1) characterized in that the colored indicator has luminescent properties.
Leakage detection wire as described in section.