JP2007165235A - Cylindrical protective cover body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical protective cover body which can improve the work of sealing alongside an interface between cold shrinkable tube or a waterproof tube and a sheath around a power cable connecting part. <P>SOLUTION: The cylindrical protective cover 1 is constituted of integration of a cold shrinking tube 4, a cylindrical inner core 2 which is arranged in the shrinkable tube 4 and supports the shrinkable tube, by expanding its diameter and which can be disassembled, and cylindrical sealing material layers 3a, 3b provided between an inner circumference of the shrinking tube and the outer circumference of the inner core. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cylindrical protective covering for covering and protecting a power cable connecting portion, and relates to a cylindrical protective covering suitable for sealing in the direction along the interface with the outer sheath (sheath) of the power cable at the connecting portion.

  For example, since power cables are used in various installation locations and external environments, a wide variety of cables with protective coatings having functions such as waterproofing and water shielding are manufactured according to the purpose of use. And also in the connection part of this kind of cables or a cable and an installation terminal part etc., according to the purpose of use, protection means, such as waterproofing and water shielding, are performed.

  As an example of the prior art for applying such protection means such as waterproofing and water shielding, there is one as described in Patent Document 1 below. This patent document 1 is a cylindrical shape having an inner / outer diameter larger than the outer diameter of a cable to be interconnected and its connecting portion, and an outer peripheral surface of an inner core having a spiral notch for disassembly formed on its peripheral wall. Further, there is disclosed a room temperature shrinkable water shielding tube (cylindrical protective covering) in which a water shielding tube made of metal foil or plastic-coated metal foil is coated and further a room temperature shrinking tube is coated on the outer peripheral surface thereof.

  And when connecting two cables linearly, one cable is previously penetrated to the said cold-shrinkable water shielding tube. After the straight line connection, the room temperature shrinkable water shielding tube is moved so as to cover the connection portion, and at that position, when the drawing proceeds from the one end side of the inner core along the spiral notch, the inner core The normal temperature contraction tube is automatically and sequentially contracted, and is in close contact with the connecting portion and the outer cable sheath (sheath) of the surrounding cable via the water shielding tube. That is, the inner core has a function of holding the cold shrink tube in a diameter-expanded state before it is pulled out and disassembled.

By the way, from the viewpoint of adhesion to the cylindrical protective covering, the outer surface of the cable is desired to have a smooth surface, but the presence of an uneven surface cannot necessarily be avoided. For this reason, vapor and liquid components such as moisture permeate from the outside along the interface between the shrinkable tube and the water shielding tube after shrinkage and the jacket of the cable, and deteriorate the electrical connection state of the connection portion. There is a risk of causing electrical and mechanical problems on the connection part. In Patent Document 1, as a countermeasure, for example, as shown in the explanatory text of FIG. 4 and paragraph [0010] of the same, the outside of the cable corresponding to both end portions of the cold-shrinkable water shielding tube is used. It is disclosed that a watertight tape for enhancing watertightness is wound around the outer periphery of a portion (sheath).
Japanese Patent Laid-Open No. 2002-15790

  By the way, in the prior art, in order to improve the water tightness in the direction along the interface between the inner surface of the cold-shrinkable tube or the water shield tube and the outer surface of the cable (sheath), the protective means for the connecting portion is provided. In application, an extra work of winding a watertight tape separate from the cold-shrinkable water shielding tube around the outer periphery of the outer sheath (sheath) of the cable is required. Further, the winding operation of the watertight tape is generally performed manually, and a high level of skill is required to reliably obtain the desired watertightness, and individual differences among workers may adversely affect the watertightness. There is. Generally, a semi-solid rubber sealing tape is used for the waterproof tape, and a separator (release paper) is attached to the tape, so that extra dust is generated after the water-tight tape is wound. There is also.

  In order to solve the problems of the prior art, the present invention provides the workability of sealing in the direction along the interface between the cold shrink tube or the water shielding tube and the outer sheath (sheath) of the cable around the conductor connecting portion. It aims at providing the cylindrical protective coating body which can be improved.

  The cylindrical protective covering according to the first aspect of the present invention includes a normal temperature shrinkable tube, a tubular inner core that is disposed in the shrinkable tube and is capable of expanding and holding the shrinkable tube to be disassembled, and the shrinkable tube A cylindrical sealing material layer provided between the circumference and the outer circumference of the inner core is integrally provided.

  According to a second aspect of the present invention, in the cylindrical protective covering according to the first aspect, the sealing material layer is a semi-solid state in which the fixing force to the inner core is smaller than the fixing force to the shrinkable tube. It is characterized by comprising a rubber sheet.

  According to a third aspect of the present invention, in the cylindrical protective covering according to the first aspect, a lubricant layer is interposed between the sealing material layer and the inner core.

  According to a fourth aspect of the present invention, in the cylindrical protective covering according to the first aspect, a separator film for the sealing material layer is interposed between the sealing material layer and the inner core and can be disassembled. It is characterized by that.

  According to a fifth aspect of the present invention, in the cylindrical protective covering according to the first or second aspect, the sealing material layer is a butyl rubber material, and the inner core is polyethylene, polypropylene, and polyethylene and polypropylene. And a material selected from the group of mixtures.

  The present invention described in claim 6 is the cylindrical protective covering according to any one of claims 1 to 5, wherein the sealing material layer provided on the outer periphery of the inner core and the room temperature shrinkable tube A water shielding tube is interposed between a sealing material layer provided on the inner periphery.

  The cylindrical protective covering of the present invention has a cylindrical sealing material layer provided integrally between the inner periphery of the cold-shrinkable tube and the outer periphery of the cylindrical inner core that can be dismantled to keep the diameter expanded. ing. Therefore, in the operation of covering and protecting the conductor connection portion of the power cable and the cable jacket (sheath) in the vicinity thereof using the cylindrical protective cover, the interface between the cylindrical protective cover and the cable jacket The sealing in the direction along is performed by the sealing material layer being automatically tightened and brought into close contact with the cable jacket by the shrinkage of the cold shrinkable tube as the inner core is dismantled. Therefore, in the connection work site, there is no need for an extra work step such as pre-wrapping the watertight tape around the cable jacket as in the prior art, and the sealing is easily and reliably performed without depending on the skill level of the operator. Can be done.

  Further, when the materials of these related members are combined so that the fixing force of the sealing material layer to the inner core is smaller than the fixing force to the shrinkable tube, or between the sealing material layer and the inner core In the case where a lubricant layer is provided between them, a separator (release paper) is unnecessary, and there is an effect that generation of extra dust after connection work is avoided.

  Hereinafter, Example 1 which shows embodiment of the cylindrical protective covering by this invention is demonstrated with reference to FIG.1 and FIG.2. FIG. 1 is a cross-sectional view showing a cylindrical protective covering according to the first embodiment. FIG. 2 is a view illustrating a case where a connecting portion of two linearly connected power cables is covered and protected using the cylindrical protective covering. It is sectional drawing which shows this state. However, the power cable, its connecting portion and the inner core are shown in a side view.

(Example 1):
The cylindrical protective covering 1 in the first embodiment includes a cylindrical inner core 2, two cylindrical sealing material layers 3a and 3b coated on the outer periphery thereof, and a cylindrical room temperature coated on the outer periphery thereof. A shrink tube 4 is provided. These cylindrical members are arranged coaxially or in an axial parallel relationship with each other.

  The inner core 2 is made of, for example, a material selected from the group consisting of polyethylene (PE), polypropylene (PP), and a mixture of polyethylene and polypropylene. And the said inner core 2 is shape | molded by the cylindrical body which wound the ribbon which consists of such a material helically, and becomes the shape which provided the helical notch 2a which continues along the cylinder periphery. .

  The outer diameter of the inner core 2 is larger than the outer diameters of the cable and the connecting portion that are connected in a straight line, and a cylindrical gap is formed between these coaxially arranged members. One end portion 2b of the tube of the inner core 2 is one end portion of the ribbon, and is connected to a knob portion 2c which is disposed at the other end portion of the tube so as to be freely drawn out. The knob portion 2c is connected to the tube. The inner core 2 is sequentially disassembled from the left side toward the right side in FIG. 1 with the spiral notch 2a as a boundary as it is pulled out from the inside.

  The normal temperature shrinkable tube 4 is made of an insulating synthetic rubber, such as ethylene propylene rubber (EP rubber) or silicon rubber, which shrinks at normal temperature and has excellent stretch properties, and has a cylindrical length of two linearly connected tubes. The length is sufficient to cover the outer periphery (sheath) of both the cable connection portion and the surrounding cables. In addition, the cold shrinkable tube 4 is held in an expanded state on the outer periphery of the inner core 2, but after the inner core is disassembled, the inner diameter of the tube is sealed to the outer diameter of the cable or the connecting portion or the outer diameter thereof. It has a shrinkage capacity that is smaller than the dimension including the thickness of the material layer and causes a tightening action on the sealing material layer and the cable.

  The sealing material layers 3a and 3b are made of an adhesive material obtained by stretching a semi-solid rubber, for example, a rubber mainly composed of an uncrosslinked butyl rubber-based material into a sheet shape, and mutually in the axial direction. They are spaced apart and arranged at both ends of the cold shrink tube 4 respectively. The sealing material layers 3a and 3b are positioned inside the both ends of the cold shrink tube 4 and extended to the inner portions of the cable connecting portions 7 and the outer sides of the cold shrink tube 4 respectively. Each has an extended outer portion. Here, the sealing material layer is composed of the two sealing material layers 3a and 3b. However, the sealing material layer may be formed in one cylindrical shape over the entire cylinder length of the room temperature shrinkable tube 4. .

  Each of the above materials used for the inner core 2, the sealing material layers 3a and 3b, and the normal temperature shrinkable tube 4 has a fixing force (adhesive force) to the sealing material layers 3a and 3b of the inner core 2, The material combination is such that a relationship is obtained that is smaller than the fixing force (adhesive force) of the normal temperature shrinkable tube 4 to the sealing material layers 3a and 3b.

  Due to such a material combination, the inner core 2 has a sealing material while maintaining the mutually fixed state without peeling off the cold shrink tube 4 and the sealing material layers 3a and 3b during the disassembly. It is easily peeled off from the layers 3a and 3b. Moreover, if the outer peripheral surface of the inner core 2 is subjected to smooth molding or smoothing treatment to increase the surface smoothness, the peeling becomes even smoother. In this case, a separator (release paper) that finally becomes waste as described in the prior art is not necessary.

  The inner core 2 is made of a polyethylene or polypropylene synthetic resin, as described above, so that it can be easily formed into a cylindrical shape, can maintain a diameter-enlarged shape that can withstand the shrinkage force of the room temperature shrinkable tube 4, and a sealing material. Ease of smooth surface molding for improving peelability from the layer is obtained.

  Next, referring to FIG. 2, a description will be given of a method for protecting the cable and protecting the connection portion with the cylindrical protective covering 1. First, a connecting portion 7 is formed that is passed through one power cable 5 (or 6) and linearly connected to each other with the ends of both cables 5 and 6 in a coaxial butted arrangement. The connection portion 7 is formed using, for example, a normal temperature shrinkage linear connection member. Thereafter, the cylindrical protective covering 1 is moved and arranged so as to cover the outer cover portions 5a and 6a of the connecting portion 7 and the cables 5 and 6 around the connecting portion 7.

  Therefore, when the knob portion 2c of the inner core 2 shown in FIG. 1 is pulled out, the inner core 2 follows the spiral notch 2a from the one end portion 2b of the ribbon in accordance with the drawing or drawing amount. Are dismantled sequentially. As the dismantling progresses, the cold-shrinkable tube 4 self-shrinks and sequentially tightens the jacket portions 5a and 6a of the cables via the sealing material layer 3a (3b), thereby Sealing in the direction along the interface with the cable jacket is automatically performed. Therefore, even when the outer peripheral surfaces of the outer sheaths (sheaths) of both the cables have irregularities during the sealing, the irregularities are filled by the sealing material layers 3a and 3b, so that airtightness and liquid tightness are obtained. . Further, the sealing work does not require an extra work step for winding the watertight tape around the distribution line jacket as in the prior art, and can be performed easily and reliably without depending on the skill level of the operator.

  By the way, in Example 1, the sealing material layers 3a and 3b are within the range of both ends of the cold shrink tube 4, but are extended to the outer sides of the cold shrink tube 4 (not shown). ) May be provided. If each such outer part is provided, the interface path (creeping path) in the direction along the interface can be increased, and the airtightness and liquid tightness can be further increased. Furthermore, when it is intended to enhance the waterproofing effect by separately wrapping a watertight tape, each outer portion of the sealing material layers 3a and 3b can be used as a base sealing material for the separate watertight tape. A sealing effect with higher liquid-tightness can be obtained.

  In addition, the thickness and the cylinder inner and outer diameters of the cylindrical inner core 2, the sealing material layers 3a and 3b, and the room temperature shrinkable tube 4 are set to appropriate dimensions according to various outer diameters of the distribution line and its connecting portion. .

  Furthermore, a lubricant layer such as silicon oil may be interposed between the outer peripheral surface of the inner core 2 and the inner peripheral surfaces of the sealing material layers 3a and 3b by coating or the like. In this case, each material of the inner core 2 and the sealing material layers 3a and 3b may or may not be specified as a combination of materials as described above. When the lubricant layer is used, the inner core 2 and the sealing material layers 3a and 3b are easily separated from the sealing material layer and disassembled regardless of the material characteristics. The freedom of material selection is improved.

(Example 2):
FIG. 3 shows a second embodiment in which a water shielding function is added to the cylindrical protective covering. That is,
The cylindrical protective covering 10 includes a cylindrical inner core 2 similar to that of the first embodiment, two cylindrical first sealing material layers 13a and 13b provided on the outer periphery thereof, and both the sealing material layers. Cylindrical water-impervious tube 14 coated on the outer periphery across the outer periphery, and a cylindrical room temperature as the outermost layer disposed on the outer periphery and coated with two cylindrical second sealing material layers 15a and 15b on the inner periphery A shrink tube 16 is provided.

  These cylindrical members are arranged coaxially or axially parallel to each other, and the water shielding tube 14 is made of, for example, a metal foil having a thickness of 20 μm or a plastic-coated metal foil. . Further, the first and second sealing material layers (13a, 13b), (15a, 15b), and the cold shrink tube 16 are materials having the same characteristics as the sealing material layer and the cold shrink tube in the first embodiment. Is used. Further, the connection method of the power cable and the protection work method of the connection portion by the cylindrical protective covering 10 are performed according to the method in the first embodiment.

  The first and second sealing material layers (13 a, 13 b) and (15 a, 15 b) are all disposed in both ends of the tube of the cold shrink tube 16. However, as described in the first embodiment, the first and second sealing material layers are provided with outer portions extending in the axial direction at both ends of the tube of the cold shrink tube 16 as described above. The sealing effect can be further improved.

  According to the invention shown in Example 2, even if moisture or the like enters through the material molecular structure of the cold shrink tube 16 over a long period of time, the intrusion is blocked by the water shielding tube 14, and the first and Since the second sealing material layers 13a, 13b, 15a, and 15b improve the airtightness and liquid tightness in the direction along the interface, the protection of the cable connection portion is further improved than in the first embodiment. .

  By the way, a separator film (release paper: extremely high smoothness) that is attached to a generally widely used adhesive tape is wrapped around or attached to the outer periphery of the cylindrical inner core 2. May be. In this case, since it is not necessary to weaken the fixing force (adhesive force) of the inner core 2 itself to the sealing material layer, the degree of freedom in selecting the material is high.

Such a separator film is preliminarily formed into a ribbon shape that is superposed on the ribbon for the inner core 2, and the separator film is wound outside together with the ribbon for the inner core so as to be integrally spirally wound. What is necessary is just to shape | mold in the shape. And if one end part of the ribbon of the separator film is connected to the knob part 2c of the inner core 2,
When the knob portion 2c is pulled out from the cylinder, the inner core is disassembled and both ribbons are pulled out. Therefore, the workability of the disassembly of the inner core 2 is smoothly performed, and the separator film becomes a lump of waste together with the inner core ribbon during the same operation, and thus is separated and scattered from the inner core ribbon. A decrease in workability can be avoided.

It is sectional drawing which shows the cylindrical protective covering which concerns on Example 1 of this invention. It is sectional drawing which shows the state which coat | covered and protected the electric power cable connection part using the cylindrical protective covering which concerns on Example 1 of this invention. It is sectional drawing which shows the cylindrical protective covering which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 10 Cylindrical protective covering 2 Inner core 3a, 3b, 13a, 13b, 15a, 15b Sealing material layer 4, 16 Room temperature shrinkable tube 14 Water shielding tube

Claims (6)

  A normal temperature shrinkable tube, a tubular inner core disposed in the shrinkable tube and capable of expanding and holding the shrinkable tube to be disassembled, and a tubular shape provided between the shrinkable tube inner periphery and the inner core outer periphery A cylindrical protective covering comprising a sealing material layer and an integrated body.   2. The cylindrical protective covering according to claim 1, wherein the sealing material layer is composed of a semi-solid rubber sheet having an adhesion force to the inner core smaller than an adhesion force to the shrinkable tube. Characteristic cylindrical protective covering.   The cylindrical protective covering according to claim 1, wherein a lubricant layer is interposed between the sealing material layer and the inner core.   2. The cylindrical protective covering according to claim 1, wherein a separator film for the sealing material layer is interposed between the sealing material layer and the inner core, and a separator film for the sealing material layer is interposed. .   The cylindrical protective covering according to claim 1 or 2, wherein the sealing material layer is a butyl rubber material, and the inner core is a material selected from the group consisting of polyethylene, polypropylene, and a mixture of polyethylene and polypropylene. A cylindrical protective covering characterized by the above.   The cylindrical protective covering according to any one of claims 1 to 5, wherein a sealing material layer provided on an outer periphery of the inner core and a sealing material layer provided on an inner periphery of the normal temperature shrinkable tube; A cylindrical protective covering, wherein a water shielding tube is interposed between the two.

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