JP2001231123A - Water-tight normal temeperature thermo-shrink insulation cylinder and cable connector using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-tight normal temperature thermo-shrink insulation cylinder and a cable connector using the same that assures excellent water-tight characteristic and efficiency for connection and water-tight processes in order to realize easier cable connection and water-tight process even in the area where use of heat source is restricted. SOLUTION: A water-tight normal temperature thermo-shrink insulation cylinder 1 comprises A water-tight normal temperature thermo-shrink insulation cylinder 1 comprises a cylindrical core 2 that can be dismantled, a normal temperature thermo-shrink reinforced insulation cylinder 3 that is supported in the elastically diameter-widened condition on the cylindrical core 2, a water- tight layer 4 that is formed by winding cylindrically a metal foil 4A in the circumferential direction on the reinforced insulation cylinder 3 and then overlapping the foil at both ends opposed with each other, a normal temperature thermo-shrink water-tight protection layer 5 covering the external circumferential surface of the water-tight layer 4, and an adhesive layer 6 for closely adhering the reinforced insulation cylinder 3 and water-tight protection layer 5 by holding the water-tight layer 4 in the embedded condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-proof type cold-shrinkable reinforced insulating tube used for connecting a power cable and a cable connecting portion using the same.

[0002]

2. Description of the Related Art Conventionally, in order to ensure high reliability of power supply, not only a power cable body but also a cable connection portion has been required to have high water-blocking performance. I have. The conventional water-blocking structure of the cable connection
For example, a rubber reinforcing insulating tube is provided over a cable conductor connecting portion of a plastic insulated power cable typified by cross-linked polyethylene insulation and a cable insulator on both sides thereof, and a heat shrinkable A water-impervious heat-shrinkable tube formed by embedding and forming a water-impervious layer formed by winding a metal foil into a tube in the circumferential direction in a tube is covered, and the tube is heat-shrinked to be in close contact with the outer peripheral surface of the reinforced insulating tube. Things.

[0003]

In the conventional structure,
At the site where the cable connection is formed, after the reinforcing insulation tube is provided on the cable conductor connection, etc., the water-impervious heat-shrinkable tube is placed on top of it. Therefore, even if a water-shielding heat-shrinkable tube is put on the tube and shrunk, it does not adhere evenly, and a minute gap is easily formed between the two. For this reason, water is immersed from the gap, and if this immersion continues for a long period of time, there is a possibility that the insulation of the connection portion may be deteriorated. In addition, there are problems in that the number of work steps for cable connection and water shielding increases, and the work becomes complicated. In addition, work time is required and workability is deteriorated. Further, a heat source for shrinking the water-shielding heat-shrinkable tube is required, and it is difficult to perform connection and water-shielding treatment in a restricted place or in a narrow place.

The present invention solves the above-mentioned problems, and has excellent water-blocking performance, good workability of connection and water-blocking treatment, and even in a place where the use of a heat source is restricted, etc. It is an object of the present invention to provide a water-shielding cold-shrinkable reinforced insulating tube capable of easily performing a water treatment operation and a cable connecting portion using the same.

[0005]

In order to achieve the above object, in the present invention, a tubular core which can be disassembled, and a room-temperature shrinkable material which is supported on the tubular core in an elastically expanded state. A reinforced insulating cylinder, a water-impervious layer formed by wrapping a metal foil in a cylindrical shape on the reinforced insulating cylinder in a circumferential direction and overlapping opposite side edges thereof, and an outer peripheral surface of the water-impervious layer. A water-blocking cold shrinkage characterized by having a cold-shrinkable waterproof protection layer to be coated and an adhesive layer for holding the water-blocking layer embedded and holding the reinforcing insulating cylinder and the waterproof protection layer in close contact with each other. A cable conductor connecting portion formed by stripping the end of a cable to be connected, a cable conductor connecting portion formed on the end of a cable to be connected, and a cable insulator on both sides of the insulating sheath, It is characterized by being mounted on these so as to straddle the conductive layer Buru connection portion is provided.

According to the present invention, cable connection and waterproofing are performed by using a reinforced insulating cylinder in which a cold-shrinkable reinforced insulating cylinder, a water-blocking layer and a cold-shrinkable waterproof protective layer are integrally formed in close contact with each other. Since the processing work is performed, the installation and the covering work of the reinforced insulating cylinder, the waterproof layer and the waterproof protective layer can be performed at the same time.
The number of water shielding work steps is reduced, these works can be performed easily and in a short time, and workability can be improved. In addition, since the water-impervious layer is held embedded in the adhesive layer, there is a gap between the reinforcing insulating cylinder and the water-impervious layer and between the water-impervious layer and the waterproof protective layer. Is difficult to do,
Water intrusion can be prevented, and the progress of insulation deterioration of the cable connection portion can be delayed. Further, since a heat source is not required for cable connection and water shielding work, these operations can be performed even in a place where the use of the heat source is restricted or in a narrow place where it is difficult to store the heat source, thereby improving work efficiency. .

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, a waterproof impermeable cold-shrinkable reinforced insulating cylinder 1 according to the present invention has a cylindrical core 2 that can be disassembled and has elasticity on the cylindrical core 2, that is, retains elasticity. A cold-shrinkable reinforced insulating cylinder 3 supported in an expanded state and a water-blocking layer 4 formed thereon
A cold-shrinkable waterproof protective layer 5 covering the outer peripheral surface of the water-blocking layer 4, and an adhesive for holding the water-blocking layer 4 embedded and holding the reinforcing insulating cylinder 3 and the waterproof protective layer 5 in close contact with each other. (Adhesive layer) 6.

The cylindrical core 2 is formed, for example, by winding a cord made of polypropylene having a rectangular cross section in a spiral shape into a cylindrical shape, and by welding the adjacent cords so as not to lose their shape. Things are used. This cylindrical core 2
A configuration in which the tubular core 2 can be gradually disassembled and removed from one end side by pulling the cord-like body inward from one end side of the tubular core 2 and pulling the cord body through the hollow hole in the tubular core 2 to the other end side. It has become.

The reinforced insulating cylinder 3 generally uses, as a base rubber, ethylene propylene rubber, silicone rubber or the like having high insulation performance and excellent moldability, and has an inner conductive layer 3A, a reinforced insulator 3B and an outer conductive layer. 3C is integrally molded so as to have a spindle shape, and is composed of one part (one piece) as a whole, and is radially expanded on the cylindrical core 2 (while maintaining an elastic state). It is supported in the state where it was done.

As shown in detail in FIG. 2, the water-impervious layer 4 is a metal foil (including a metal film and sheet) 4A made of copper, aluminum, lead or the like having a thickness of 0.01 to 0.1 mm. To the opposite side edges 4B, 4C
Are overlapped by about 5 to 20 mm, preferably about 10 to 15 mm, and the overlapped portion is water-tightly sealed with an adhesive, and is held in a state of being embedded in the thickness direction (radial direction) of the adhesive layer 6. The metal foil 4A is not only formed by bending a single metal foil into a cylindrical shape, but also formed by winding two or more metal foils in the circumferential direction so that both side edges of each foil overlap. May be. Further, the metal foil may be processed into a corrugated shape (corrugated shape) so as to have elasticity in the circumferential direction. As described above, when a plurality of metal foils or corrugated metal foils are used, the water-impervious cold-shrinkable reinforced insulating tube 1 is used for cable connection and water-impervious treatment,
Even when shrinking at room temperature, it is effective in suppressing a local large strain from being applied to the metal foil and preventing cracks and wrinkles from occurring.

The waterproof protective layer 5 is formed into a cylindrical body mainly composed of a rubber material such as styrene-butadiene rubber, chloroprene rubber, butadiene rubber, urethane rubber, ethylene propylene rubber, silicone rubber, and fluorine rubber. Are supported in a state of being elastically expanded in the radial direction.

The adhesive layer 6 is made of, for example, an insulating rubber such as butyl rubber, chloroprene rubber, acrylic rubber, or polyvinyl acetate, or a plastic material.

Reference numeral 7 denotes a grounding member made of a grounding wire made of a conductive material such as copper or aluminum, and a reinforcing member is provided between the reinforcing insulating cylinder 3 and the adhesive layer 6 provided inside the water-blocking layer 4. Along the longitudinal direction of the insulating tube 1, both ends are disposed so as to be exposed from the end of the tube, and are embedded in the reinforcing insulating tube 1. The grounding member 7 is connected to the metal shield layers of the cables on both sides after the reinforcing insulating cylinder 1 is provided on the cable conductor connection portion or the like, and electrically connects both shield layers. In this embodiment, the ground member 7 is provided.
A may be used in place of the grounding member, and grounding lead portions may be provided at both ends of the grounding member, and these may be connected to the metal shielding layers of both cables so that both shielding layers are electrically connected to each other.

The water-impervious cold-shrinkable reinforced insulating cylinder 1 of the present embodiment has the above-described configuration. This insulating cylinder 1
By dismantling and removing the tubular core 2, the reinforcing insulating tubular body 3 and the waterproof protective layer 5 shrink at normal temperature to reduce the diameter. At this time, since the reinforcing insulating cylinder 3, the grounding member 7, the water shielding layer 4 and the waterproof protective layer 5 are integrally adhered by the adhesive layer 6, the reinforcing insulating cylinder 1 is connected to the conductor connecting portion of the cable connecting portion. Even when the metal foil 4A constituting the water-blocking layer 4 is shrunk at room temperature by being placed on the metal foil, the metal foil 4A does not crack due to local stress or vice versa, and the water-blocking performance is excellent. .

Next, a description will be given of a method of manufacturing the above-mentioned water-insulating cold-shrinkable reinforced insulating cylinder 1. First, a room temperature shrinkable reinforcing insulating cylinder 3 is supported on a cylindrical core 2 in a state of being elastically expanded. Specifically, as shown in FIG. 3, a diameter-enlargement jig 8 including a circular large-diameter portion 9 having a cylindrical core insertion hole 9A, a tapered portion 10, and a circular small-diameter portion 11 is used. That is, the cylindrical core insertion hole 9A on the large diameter portion 9 side of the diameter increasing jig 8
, And a cold-shrinkable reinforced insulating cylinder 3 is inserted from the small diameter portion 11 side.

The large diameter portion 9 and the tapered portion 1 of the diameter increasing jig 8
A lubricant such as silicone oil, silicone grease, fluorine oil, ethylene glycol, paraffin wax or the like is applied in advance to the outer peripheral surface of the 0 and the small diameter portion 11 in order to facilitate the work of expanding the reinforcing insulating cylinder 3. Preferably. The lubricant is appropriately selected according to the material of the reinforcing insulating cylinder 3 and the like.

Next, the reinforcing insulating cylinder 3 is slid sequentially on the outer peripheral surfaces of the tapered portion 10 and the large diameter portion 9 of the diameter increasing jig 8. When the front end of the reinforcing insulating cylinder 3 exceeds the end of the large-diameter portion 9, the reinforcing insulating cylinder 3 self-shrinks and shifts to the rear end of the cylindrical core 2. Is gripped. Further, when the reinforcing insulating cylinder 3 is slid onto the outer peripheral surface of the large-diameter portion 9 and pushed in, the cylindrical core 2 is gradually pulled out from the cylindrical core insertion hole 9A, and the reinforcing insulating cylinder 3 becomes cylindrical. It is completely transferred onto the core 2 and is supported on the cylindrical core 2 in an expanded state as shown in FIG.

Next, one or a plurality of grounding wires made of copper, aluminum, or the like, for example, are spirally wound in a cylindrical shape on the reinforcing insulating tubular body 3 along its longitudinal direction. The grounding member 7 formed by braiding the grounding wire of the above into a cylindrical shape, or by vertically attaching and forming a braided sheet formed by braiding a plurality of grounding wires into a cylindrical shape, is attached to both ends of the reinforcing insulating cylindrical body 3. And secure it so that it can be pulled out of the desired length. Thereafter, the metal foil 4A sandwiched from both sides by the adhesive layer 6 and embedded in the adhesive layer 6 is wound in a cylindrical shape in the circumferential direction on the outer peripheral surface of the reinforcing insulating cylinder 3, and the opposite side edges 4B, 4C
(Not shown) are overlapped, and the overlapped portion is water-tightly sealed with an adhesive to form a water barrier layer 4 (see FIG. 5).

Next, a cold-shrinkable waterproof protective layer 5 is put on the outer peripheral surface of the adhesive layer 6 on the water-blocking layer 4 and supported. With respect to the method of covering the waterproof protective layer 5, for example, the following two methods will be described. The first method is a method using the diameter expanding jig 8. In this case, the diameter-increasing jig 8 used is slightly larger than that used when the diameter of the reinforcing insulating cylinder 3 is increased. The diameter expansion method is the same as the diameter expansion method of the reinforced insulating cylinder 3. That is, the cylindrical core insertion hole 9A on the large diameter portion 9 side
Insulating tubular body 3 supported by tubular core 2 and water barrier layer 4
And the like, and at the same time, the room-temperature-shrinkable waterproof protective layer 5 is inserted from the small-diameter portion 11 side. Then, the composite tubular body is slid over the outer peripheral surfaces of the tapered portion 10 and the large-diameter portion 9 sequentially, so that the adhesive layer 6 of the composite tubular body is finally obtained.
This is a method of covering the top and supporting it in an expanded state.

In a second method, another disassembled cylindrical core 2 having an inner diameter slightly larger than the outer diameter of the composite cylindrical body is provided.
The waterproof protective layer 5 is previously supported in an expanded state using the diameter expanding jig 8. Next, the waterproof protective layer 5 whose diameter is supported by the cylindrical core 2 is fitted and inserted onto the composite tubular body, and the tubular core 2 is disassembled and removed, thereby causing the waterproof protective layer 5 to self-shrink. This is a method of covering the composite tubular body with force and supporting it in an expanded state.

In this way, the reinforcing insulating tubular body 3, which is cold-shrinkable at normal temperature, the grounding member 7, the water-blocking layer 4, and the waterproof protective layer are integrally adhered to the tubular core 2 by the adhesive layer 6, whereby A waterproof impermeable cold-shrinkable reinforced insulating cylinder 1 having the structure shown in FIG.

Next, the waterproof impermeable cold-shrinkable reinforced insulating cylinder 1
6 and 7 will be described with reference to FIGS. First, as shown in FIG. 6, from the ends of two power cables (crosslinked polyethylene insulated power cables) 12 to be connected, a conductor 13, a cable insulator 14, a cable outer conductive layer 15, a metal shielding layer 16, a cable The water-impervious layer 17 and the cable sheath 18 are peeled off stepwise to be exposed stepwise.

Next, a water-impermeable cold shrinkable tube 19 is passed through the cable sheath 18 of each of the power cables 12 and the water-impermeable cold shrinkable reinforcement according to the present invention is passed over the cable sheath 18 of one of the power cables 12. It is made to stand by in advance through the insulating cylinder 1.

The water-impregnated cold shrinkable tube 19 includes a tubular core 20 that can be disassembled, an inner cold shrinkable tube layer 21 supported on the tubular core 20 in an elastically expanded state, and an outer cold shrinkable tube layer 21. A cold shrinkable tube layer 22 and a cold shrinkable tube layer 21 on the inner side and a cold shrinkable tube layer 22 on the outer side are formed by winding a metal foil in a cylindrical shape in the circumferential direction so as to overlap opposite side edges thereof. And an adhesive layer 24 formed by adhering to the inner and outer peripheral surfaces of the water-impervious layer 23 and adhering the water-impervious layer 23 and the cold-shrinkable tube layers 21 and 22 to each other. Have.

Next, the conductors 13 of the two cables 12 are passed through the conductor connection sleeve 25 and joined to each other, and the conductor sleeve 25 is compression-clamped to form a cable conductor connection portion 26.
Next, the water-impervious cold-shrinkable reinforced insulating tube 1 that has been put on standby on the cable sheath 18 covers the cable conductor connecting portion 26 and the cable insulators 14 on both sides thereof so that both ends straddle the cable outer conductive layer 15. At the position just above the cable conductor connection portion 26 for positioning.

Next, the tubular core 2 of the waterproof impermeable cold-shrinkable reinforced insulating cylinder 1 is gradually disassembled and removed from one end thereof, and the reinforced insulating tubular body 3 and the waterproof protective layer 5 are gradually removed from one end thereof. After the tubular core 2 is disassembled by contraction at normal temperature and the tubular core 2 is disassembled, the waterproof impermeable cold-shrinkable reinforced insulating tube 1 is connected to the cable conductor connection portion 20, the cable insulators 14 on both sides thereof, and the cable outer conductive layer 1
5 so as to cover it.

Next, the grounding members 7 respectively drawn from both ends of the water-impervious cold-shrinkable reinforced insulating cylinder 1 are fixed to the metal shielding layers 16 and 17 of both power cables by fixing members 27 such as bind wires. Connect with.

Next, an adhesive watertight sheet 28 is wound around each of the spindle-shaped tapered ends of the water-shielding cold-shrinkable reinforced insulating cylinder 1 and the vicinity of the stripped end of the cable sheath 18. Thereafter, the water-impermeable cold-shrinkable tube 19 that has been waiting on the cable sheath 18 is moved to a position that straddles the spindle-shaped tapered ends of the water-impregnated cold-shrinkable reinforced insulating cylinder 1 and a position straddling the cable sheath 18. The tubular core 20 is disassembled and removed, and the cold-shrinkable tube layers 21 and 22 of the tube 19 are shrunk at normal temperature. As a result, as shown in FIG. 7, the water-impregnated cold shrinkable tube 19 covers both ends of the water-impregnated cold-shrinkable reinforced insulating tube 1, the metal shielding layer 16, the metal waterproof layer 17, and the cable sheath 18. The two ends of the waterproof impermeable cold-shrinkable reinforced insulating cylinder 1 are hermetically sealed in a liquid-tight manner.

[0029]

The present invention is embodied in the form described above and has the following effects. That is,
According to the present invention, a cable connection and a water shielding treatment operation are performed using a reinforced insulating cylinder in which a cold-shrinkable reinforced insulating cylinder, a water-blocking layer and a cold-shrinkable waterproof protective layer are integrally formed in close contact with each other in advance. As a result, the installation and coating work of the reinforcing insulating cylinder, the water shielding layer and the waterproof protective layer can be performed at the same time, and the connection and water shielding processing work steps are reduced, and these operations can be performed easily and in a short time. Can be enhanced. In addition, since the water-impervious layer is held embedded in the adhesive layer, there is a gap between the reinforcing insulating cylinder and the water-impervious layer and between the water-impervious layer and the waterproof protective layer. Is difficult to prevent, preventing inundation,
The progress of insulation deterioration of the cable connection portion can be delayed. Furthermore, since a heat source is not required for cable connection and water shielding treatment, these operations can be performed even in a place where the use of the heat source is restricted or in a narrow place where the heat source is difficult to store, thereby improving work efficiency. be able to.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the upper half of a water-impermeable cold-shrinkable reinforced insulating cylinder according to the present invention.

FIG. 2 is a cross-sectional view showing a partially enlarged portion of a metal foil in the water blocking layer of FIG. 1;

FIG. 3 is an explanatory view of a method of expanding and supporting a reinforcing insulating cylinder on the cylindrical core shown in FIG. 1;

FIG. 4 is a longitudinal sectional view showing a state in which a reinforcing insulating cylinder is supported on a cylindrical core by the diameter expanding method shown in FIG. 3;

FIG. 5 is a longitudinal sectional view showing a state in which a waterproof layer is formed on the outer peripheral surface of the reinforced insulating cylinder shown in FIG.

FIG. 6 is an explanatory sectional view of an upper half part showing a method of forming a straight cable connection portion using the water-impermeable cold-shrinkable reinforced insulating cylinder according to the present invention.

FIG. 7 is an upper half longitudinal sectional view showing a cable straight connection portion assembled by the method shown in FIG. 6;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 water-proof cold-shrinkable reinforced insulating tube 2 tubular core 3 reinforced insulating tube 3A inner conductive layer 3B reinforced insulator 3C outer conductive layer 4 water-blocking layer 4A metal foil 4B side edge 4C side edge Layer 7 Grounding member 8 Large diameter jig 9 Large diameter section 9A Cylindrical core insertion hole 10 Tapered section 11 Small diameter section 12 Power cable 13 Conductor 14 Cable insulator 15 Cable external conductive layer 16 Metal shielding layer 17 Metal waterproof layer 18 Cable Sheath 19 Waterproof cold shrinkable tube 20 Tubular core 21 Inner cold shrinkable tube layer 22 Outer cold shrinkable tube layer 23 Waterproof layer 24 Adhesive layer 25 Conductor connection sleeve 26 Cable conductor connection 27 Fixing member 28 Adhesive watertight Sheet

Continued on front page F-term (reference) 4F100 AB01C AB10 AB17 AB23 AB33C AK07 AK09G AK17 AK22G AK25G AK28 AK28G AK29 AK51 AK52 AK64 AK73 AL01G AN02 AN02G AR00B AR00D AT00A BA04 BA07 CB05 J11 J04 J03 J05 J03 J04 BA02 BA14 CA06 CA09 CA23 5G375 AA02 BA26 BB43 BB45 CA02 CA14 CB04 CB07 CB19 CB21 CB38 CB53 DB32 DB42

Claims (2)

[Claims] 1. A tubular core that can be disassembled, a reinforced insulating tubular body that is cold-shrinkable and supported on the tubular core in an elastically expanded state, and a metal foil is wrapped around the reinforced insulating tubular body. A water-impervious layer formed by winding in a cylindrical shape in the direction to overlap the opposite side edges, a cold-shrinkable waterproof protective layer covering the outer peripheral surface of the water-impervious layer, and a water-impervious layer embedded. A water-impervious cold-shrinkable reinforced insulating cylinder having a pressure-sensitive adhesive layer for holding the reinforced insulating cylinder and the waterproof protective layer in close contact with each other. 2. A cable conductor connecting portion formed by stepping off an end of a cable to be connected to the waterproof impermeable cold-shrinkable reinforced insulating cylinder according to claim 1, and a cable insulator on both sides thereof. A cable connection portion, wherein the cable connection portion is mounted on the cover so that both ends thereof straddle the cable external conductive layer.