JP2581731Y2 - Gas leak detection sheet - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet for detecting gas leakage, which is used to cover an appropriate detection range when detecting gas.

[0002]

2. Description of the Related Art Conventionally, when a pinhole or the like is formed in an outer sheath or a connection point of a communication cable or the like, moisture or water may penetrate therefrom, and a communication failure may occur. In order to prevent this from happening early and to prevent trouble beforehand, dry gas, air, etc. are sealed or pumped into the cable, and when the pressure drop is detected, pinholes are found and repaired on site. .

[0003] On-site work is carried out by applying a soap solution to the cable and visually checking it, or recently detecting the leaking of fluorocarbon gas into the cable using a platinum electrode and sensing the leakage using the principle of the Rice effect. A method using a vessel has been performed.

Further, the present applicant has proposed a method in which helium and hydrogen gas, which have solved the disadvantages of chlorofluorocarbon gas, are sealed or pressure-fed into a sealing portion such as a cable and the leakage is detected by a detector.

[0005]

The method of applying soapy water is to apply soapy water to each connection point by hand, which requires a large number of workers and is expensive. Freon gas is one of the sources of pollution, has a long residual time, requires a long processing time for workers to enter manholes and the like, and has a low work efficiency. There are drawbacks such as leakage to the manhole, making it difficult to identify the location of the leak.

[0006] In this respect, the above-mentioned method using helium and hydrogen gas is an extremely excellent method, but since these gases are light and diffuse, detection in a wide range is easy. The task of doing is quite difficult.

[0007]

Means for Solving the Problems Therefore, in the present invention,
Covering or surrounding or covering an object such as a certain range of cables so that gas in that part can be easily detected, making gas leak detection in a wide range of places and places extremely efficient, Pinholes and other leak locations can be quickly identified , and are gas-impermeable and flexible.
A single sheet is formed, and a protruding hole is provided in a part of the sheet .

[0008]

EXAMPLES Hereinafter, the present invention will be described in detail one embodiment, shown in FIG, 1 is a sheet, a synthetic resin thin sheet, metallic Hakuha appropriate range at their laminated paper such as a gas-impermeable material It is formed to a size that covers the area.

Reference numeral 2 denotes a projecting hole, which is preferably projected to a part of the sheet 1 , preferably to the center. It is preferable that the protruding hole 2 has such a shape that the detecting portion of the detector or the sampling probe can just hit or enter. Further, it is useful if the projecting hole 2 is formed of synthetic resin, rubber, or the like, has appropriate flexibility, and can be closed by pressing the periphery thereof. When the protruding hole 2 is formed hard, a stopper, a cock, or the like may be provided. As a result, there is a possibility that the projecting hole 2 is temporarily closed to accelerate the gas confinement.

Next, the method of use will be described. For example, when detecting a gas leak from the cable 3 in the manhole, the sheet 1 is covered from the end.
At this time, when the gas leak occurred and hydrogen, although light gas of the like helium increases, is caused to dwell in that sheet 1 is covered on the sheet 1.

There is also a portion that rises away from the sheet 1 from the open end. However, the sheet stays in the sheet 1 until there is a portion that escapes from the end. The staying gas is ejected from the projecting hole 2. The gas is detected by placing or inserting the detecting portion of the detector on or in the protruding hole 2. When there is no gas detection, the sheet 1 is moved to the adjacent area to perform the detection operation. By repeating such operations, a wide range of detection can be performed.

[0012]

According to the present invention as described above, a single sheet is formed from a gas-impermeable and flexible thin leaf.
With that, since there is provided a protrusion hole in a part, very simply pipe, placed over the connecting part or the like which is said tower can cover the external. If there is a gas leak in the covered portion, the gas will be retained in the sheet due to the rise of the gas, and if there is a gas, it can be easily detected by placing or inserting the detecting part of the detector in the protruding hole or the upper part. it can. If there is no gas leak, the detection operation is performed by moving the sheet.

As described above, the detection of the gas leakage from a wide area can be easily performed by detecting the sheet efficiently by sequentially moving the sheet. Of course, the sheet is practically convenient, such as easy handling, storage and folding, and easy carrying.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view for explaining a use state of the embodiment.

[Description of reference numerals] 1 sheet 2 projecting hole 3 cable

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01M 3/04 G01M 3/14

Claims (1)

(57) [Scope of request for utility model registration] 1. A gas-impermeable and flexible thin leaf
A gas leak detection sheet, wherein one sheet is formed and a projection hole is provided in a part of the sheet.