JPH053967U - Intrusion detection device for cable connection - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to reliably detect water ingress in the cable connection part, and to reliably insulate the detection line from the metal body in the cable connection part to prevent erroneous detection. [Constitution] The infiltration detection device has two detection lines 20 and 20 '.
Made of. These detection lines 20 and 20 'include two insulated wires 22 and 22' in which conductor exposed ends 22a and 22'a are butt-connected to each other, and these two insulated wires 22 and 22 '.
22 ′ conductor connecting portion 24 and insulated wire portions 22 on both sides thereof
b, 22'b and a heat-shrinkable insulating sleeve 26 which is laid across the b and 22'b. This insulating sleeve 26
Is a sleeve portion 26a corresponding to the conductor connecting portion 24.
Heat-shrinking is performed only on the other side, and the other conductors 22a and 22'a are insulated from the other metal body without being heat-shrinked on the other sleeve portion 26b. When water is infiltrated, water invades through the gap between the sleeve portion 26b and the insulating wire portions 22b and 22'b, and the insulation resistance between the detection wires 20 and 20 'is reduced to detect water infiltration.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a water immersion detection device for a cable connecting portion that detects water intrusion into the core wire of various electric cable connecting portions.

[0002]

[Prior Art]

 If there is water in the cable connection and if the water is left in this state, the line may become unusable. Therefore, the cable connection is provided with a function of detecting water infiltration. This type of water intrusion detection device consists of two detection wires that detect electrical deterioration of electrical insulation due to water ingress into the cable connection core wire. The wire consists of an insulating wire with multiple holes that reach the conductor in the lengthwise direction in the insulating coating, and if there is water in the cable connection, this water causes the insulation resistance between the two detection wires to increase. It is designed to detect inundation when the water level drops.

[0003]

[Problems to be solved by the device]

 On the other hand, if there is a metal body inside the cable connection and this metal body is electrically connected to the detection line, the insulation resistance between the detection lines will decrease and false detection of water will occur. It is necessary to ensure the insulation between the wires. For this reason, there is a drawback that the workability at the time of manufacturing the cable connecting portion is lowered because the insulation treatment between the metal body and the detection line is required.

An object of the present invention is to provide a water intrusion detection device for a cable connection portion which avoids the above-mentioned drawbacks, can be easily insulated from a metal body in the cable connection portion, and can reliably detect water infiltration. Especially.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a flood detection device for a cable connection part, which comprises two detection wires for detecting a decrease in electrical insulation due to water immersion in the core wire of the cable connection part. Each of the detection wires is composed of two insulated wires whose exposed conductors are connected to each other, and an insulating sleeve which covers the conductor connecting portions of these two insulated wires and the insulating wire portions on both sides thereof. This insulation sleeve is heat-shrinked only in the sleeve part corresponding to the conductor connection part and in the state where a part of the conductor is exposed. To provide.

[0006]

[Action]

 In this way, each detection wire is not a perforated insulation wire, but two insulation wires and an insulation sleeve that covers the conductor connection part of the conductor exposed end and the insulation wire parts on both sides of the insulation connection part. If the insulation sleeve consists of only the conductor connection part and is thermally shrunk with the conductor partly exposed, if there is water immersion, the conductor connection will be made through the sleeve part other than the heat shrink part. Since the insulation resistance between the two detection wires decreases after reaching the area, water can be detected, and the exposed conductor end of the detection wire and the other metal body can be separated by the sleeve part other than the heat-shrink part. Since it is insulated, it will not accidentally detect water immersion due to conduction with the metal body.

[0007]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cable connecting portion 12 equipped with a water immersion detection device 10 according to the present invention. The cable connecting portion 12 includes cables 14 and 14. It comprises a core wire connecting portion 18 for connecting the cable core wires 16, 16 'of each other. In the illustrated embodiment, each of the plurality of cable core wires is butt-connected with each other by a compression sleeve or the like, but may be composed of one core wire connecting portion.

The water immersion detection device 10 is composed of two detection lines 20 and 20 ′, and these detection lines 20 and 20 ′ are connected to a detector such as a resistance measuring device (not shown) at the end of the cable. . Although not shown, the core wire connection portion 18 and the cable core wires 16 and 16 'exposed on both sides thereof are covered with the connection case together with the two detection wires 20 and 20'.

As shown in FIG. 2, each of the detection lines 20 and 20 ′ includes two insulated lines 22 and 22 ′ whose conductor exposed ends 22 a and 22 ′ are butt-connected to each other, and these two lines. It is composed of a conductor connecting portion 24 of the insulating wires 22 and 22 'and an insulating sleeve 26 which is covered over the insulating wire portions 22b and 22'b on both sides thereof. In the embodiment of FIG. 2, this insulation sleeve 26 consists of a heat-shrink sleeve over its entire length, which heat-shrinks only in the sleeve portion 26a corresponding to its conductor connection 24. The other sleeve portion 26b is not thermally contracted and insulates the conductor exposed portions 22a and 22'a from the core wire connecting portion 18.

The operation of the water infiltration detection device of the present invention shows that when there is no water in the cable connection portion 12, the insulation resistance between the detection lines 20 and 20 ′ is high and there is no water infiltration. On the other hand, the detection wires 20, 20 'are covered with the insulating sleeves 26 from both sides of the conductor exposed ends 22a, 22'a to the insulating wire portions 22b, 22'b, so that the conductor exposed ends 22a, 22' are covered. The'a does not accidentally come into contact with the metal body in the cable connecting portion 12, and the water is not erroneously detected regardless of the absence of the water.

Next, when there is water in the cable connection portion 12, the water passes through the gap between the sleeve portion other than the heat-shrinkable portion 26a of the insulating sleeve 26 and the insulating wires 22 and 22 ', and the conductor exposed end portion 22a, 22'a and thus the insulation resistance between the two sensing lines 20, 20 'is reduced through the water. Since a resistance measuring device is connected between these two detection lines 20 and 20 ', it is possible to detect water infiltration from the measurement result of this resistance measuring device. It is also possible to connect a voltage detector instead of the resistance measuring device, electrically detect the inundation from a decrease in voltage value, and operate an alarm such as a buzzer or a lamp.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the two insulated wires 22, 22 'of each sensing wire 20, 20' have their conductor exposed ends 22a, 22'a. 2 is the same as the embodiment of FIG. 2 except that it is not a butt connection but a twisted solder connection as indicated by reference numeral 28. Also in this embodiment, if there is water intrusion, water intrudes from the gap between the sleeve portion 26b other than the heat shrinkable portion 26a and the insulating wires 22 and 22 'to detect water infiltration, and normally the heat shrinkable portion 26a is also detected. Since the other sleeve portion 26b extends to the insulated wires 22 and 22 'on both sides of the exposed conductor end portions 22a and 22'a, erroneous detection does not occur due to contact with the metal body.

FIG. 4 shows still another embodiment of the present invention. In this embodiment, the conductor exposed ends 22a, 22'a of the two insulated wires 22, 22 'constituting the detection wires 20, 20' are shown. Are butt-connected, as indicated at 24, but the insulating sleeve 26 includes a non-shrinkable plastic sleeve 30, 30 'over the insulating wires 22, 22', respectively, and these plastic sleeves 30, 30 '. ′, And a heat shrink sleeve 32 that is heat shrunk over the butt joint 24 of the exposed conductor ends 22a, 22′a and the plastic sleeves 30, 30 ′. Since the operation of this embodiment is exactly the same as that of the previous embodiment, its explanation is omitted.

[0014]

[Effect of the device]

 According to the present invention, as described above, each sensing wire is not a perforated insulated wire, but spans two insulating wires, a conductor connecting portion of the conductor exposed end portion and insulating wire portions on both sides thereof. Since the insulation sleeve is covered with an insulating sleeve, and the insulation sleeve is heat-shrinked only with the conductor connecting part and a part of the conductor is exposed, it is possible to detect the water immersion reliably. Moreover, since the exposed conductor end of the detection wire and other metal bodies are insulated by the sleeve portion other than the heat-shrinkable portion, it is possible to prevent accidental intrusion of water due to conduction with the metal body.

[Brief description of drawings]

FIG. 1 is a schematic view of a cable connection portion including a water immersion detection device according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a detection line used in the present invention.

FIG. 3 is an enlarged cross-sectional view of an embodiment with a different detection line used in the present invention.

FIG. 4 is an enlarged cross-sectional view of another different embodiment of the detection line used in the present invention.

[Explanation of reference symbols] 10 water intrusion detection device 12 cable connection portion 14 cable 14 'cable 16 cable core wire 16' cable core wire 18 core wire connection portion 20 detection wire 20 'detection wire 22 insulated wire 22' insulated wire 24 butt connection portion 26 Insulation Sleeve 26a Heat Shrink Part 26b Sleeve Part Not Heat Shrink 28 Torsional Solder Connection 30 Plastic Sleeve 30 'Plastic Sleeve 32 Heat Shrink Sleeve

Claims (1)

[Claims for utility model registration] [Claim 1] In a flood detection device for a cable connection part, which comprises two detection lines that are electrically connected to each other due to water immersion into the core of the cable connection part, each of the detection lines is A pair of insulating wires whose exposed conductor end portions are connected to each other, and an insulating sleeve which covers the conductor connecting portions of the two insulating wires and the insulating wire portions on both sides thereof. The insulation sleeve is
An apparatus for detecting inundation of a cable connecting portion, which is heat-shrinked only in a sleeve portion corresponding to the conductor connecting portion and with the conductor partially exposed.