JPH0540856U - Gas leak detection sheet - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To facilitate detection of leak of light gas filled with helium by partially covering the cable. [Structure] A projecting hole 2 is provided in a part of a thin sheet 1 which is flexible and gas impermeable.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas leak detection sheet, which is used to cover an appropriate detection range during gas detection.

[0002]

[Prior Art]

 Conventionally, in a communication cable or the like, if a pinhole or the like is formed on the outer cover or the connection point, moisture or water may intrude from the pinhole or the like to cause a communication failure. We detect this early and fill or pump dry gas, air, etc. in the cable in order to prevent troubles, detect the pressure drop, and detect and repair pinholes etc. on site. .

In the field work, however, a method of applying soapy water to the cable and visually observing it, or recently, a fluorocarbon gas is pressure-fed into the cable and a platinum electrode is used to detect the leakage using the principle of the Rice effect. A method of using a detector that operates is used.

Further, the present applicant has proposed a method in which helium and hydrogen gas, which eliminate the drawbacks of CFC gas, are enclosed or pumped in an enclosure such as a cable and the leakage is detected by a detector.

[0005]

[Problems to be solved by the device]

 The method of applying soapy water involves applying soapy water to each connection point by hand, which requires a large number of workers and is expensive. In addition, CFCs are one of the sources of pollution, and the residual time is long, and it takes a long processing time for workers to enter manholes, etc., and the work efficiency is low. However, there is a defect that it is difficult to identify the location of the leak because it may leak into the manhole.

In this respect, the above method using helium and hydrogen gas is an extremely excellent method. However, since these gases are light and diffuse, it is easy to detect in a wide range. The task of identifying is rather difficult.

[0007]

[Means for Solving the Problems]

 Therefore, in the present invention, by covering, enclosing, or covering an object such as a cable within a certain range so that the gas in that part can be easily detected, the gas in a wide range of places can be detected. It is extremely efficient in detecting leaks and can quickly identify leak points such as pinholes.The sheet is made of a gas impermeable flexible material and protrudes at a part of it. It is characterized by having a hole.

[0008]

【Example】

The present invention will be described in detail below with reference to an embodiment shown in the drawings. 1 is a sheet, and a suitable range of a gas impermeable material such as synthetic resin thin leaf, metal foil leaf, or laminated paper thereof can be used. Form to cover size.

Reference numeral 2 denotes a projecting hole, which is projected in a part of the sheet 1 , preferably in the center. The protruding hole 2 is preferably shaped so that the detecting portion of the detector or the sampling probe may just hit. 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 forming the projecting hole 2 hard, a plug, a cock, or the like can be provided. Due to these, there is a possibility that the projecting hole 2 is temporarily closed to accelerate the confinement of gas.

Next, the method of use will be explained. For example, when detecting a gas leak in the cable 3 in the manhole, the sheet 1 is covered from the end. This and can, if it be the gas leakage occurs, hydrogen, and light gas of the like helium increases, is caused to dwell in that sheet 1 is covered on the sheet 1.

Then, there is also a portion that rises away from the sheet 1 from the open end. However, it 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 detector of the detector on or in the protruding hole 2. When no gas is detected, the sheet 1 is moved to the adjacent area and the detection operation is performed. A wide range can be detected by repeating such operations.

[0012]

[Effect of the device]

 According to the present invention as described above, since a sheet is formed of a gas impermeable flexible material and a projecting hole is provided in a part of the sheet, it is extremely easy to connect to a pipe, a connecting portion called a tower, or the like. Can be covered and can cover the outside. If there is a gas leak in the covered part, it will be retained in the sheet due to the rise of gas, and if there is gas by placing or inserting the detector of the detector in the protruding hole or the upper part, it will be easy. Can be detected. If there is no gas leakage, move the sheet and perform the detection operation.

As described above, the sheets are sequentially moved to detect the gas very efficiently, and it is easy to identify the location of the gas leakage from a wide range. Still, the seats are easy to handle, can be stored and folded, and are easy to carry, which makes them convenient for practical use.

[Brief description of drawings]

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

FIG. 2 is a perspective view of the same as the above for explaining the usage state.

[Explanation of symbols] 1 sheet 2 protruding hole 3 cable

Claims (1)

[Scope of utility model registration request] 1. A gas leakage detection sheet, characterized in that the sheet is formed of a gas-impermeable flexible material and a projecting hole is provided in a part thereof.