JP2005137176A - Cable connection protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protector that electrically and mechanically protects a periphery of a cable connecting portion without taping.
SOLUTION A protective body 1 includes a protective case 2 that accommodates a cable connecting portion 25. The protective case 2 has an upper half 3 and a lower half 4 that can be opened and closed. Are formed in the boundary portion 7 of the lower half 4 and insertion holes 8 and 9 are inserted through the inlet side and the outlet side of the cable connection portion 25, and the cables 20 are crimped to the inner surfaces of the cable insertion holes 8 and 9. Part 10 is provided.
[Selection] Figure 1

Description

  The present invention relates to a protector for a cable connecting portion, and more particularly to a protector that does not require a taping process around a cable connecting portion.

  In buildings such as factories and buildings, and facilities such as nuclear power plants, a number of cables such as communication cables, control cables, and power cables are laid, and these cables are connected at any time in the laying route or in the control panel. In order to connect between cables, first, the covering of the cable ends is peeled to expose the core wire, and the core wire is covered with, for example, a connection sleeve and crimped (so-called splice joint), and then the core wire portion including the connection sleeve In general, a method of taping a coating portion in contact therewith with an insulating tape such as a vinyl tape is employed.

  In addition, in order to prevent electrical influence from the surroundings in communication cables and control cables, there is an electric shield type in which a shield tape such as an aluminum tape or a copper tape is wound. When connecting between such electrically shielded cables, it is necessary to wrap an aluminum tape or a copper tape around the connecting portion in order to avoid interruption of the shielding effect.

  However, in general cables, taping the cable connection with insulating tape is cumbersome and time consuming, and the insulation and mechanical strength tend to vary. The impact on the increase in work man-hours and work hours is also significant. Furthermore, in the case of an electric shield type cable, complicated winding work of aluminum tape or copper tape is added.

  In addition, even if the electrical insulation of the cable connection portion is ensured by an insulating tape, the mechanical protection is often insufficient. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve these problems in the protection of conventional cable connection parts, and to provide a new protector used for that purpose.

  A protector for a cable connection portion according to the present invention that solves the above-described problems includes a protective case that accommodates the cable connection portion, and the protective case includes an upper half body that can be opened and closed and a lower half body, An insertion hole for inserting the inlet side and the outlet side of the cable connection part is formed at the boundary between the split body and the lower half part, and a crimping part for crimping the cable is provided on the inner surface of each cable insertion hole. (Claim 1).

  In the protective body, an electric shield layer can be provided on the inner surface of the protective case.

  In any one of the above-described protective bodies, an electrically insulating support body that supports the plurality of core wires in the cable connection portion at intervals can be provided.

  Furthermore, in any one of the above-described protectors, the cable connection portion may be a connection portion between a new cable and an existing cable in an electric facility modification work.

  According to the protector according to the present invention, since the cable connection portion can be accommodated in the protective case, electrical insulation around the cable connection portion can be secured without taping. In addition, since the front and rear of the cable connecting portion can be supported by being crimped by the crimping portion, the cable connecting portion is firmly fixed to the protective case, and mechanical protection against the pulling force can be secured. Therefore, the construction reliability of the cable connecting portion is increased, the work man-hours and the work period when connecting a large amount of cables can be greatly reduced, and the construction cost can be reduced accordingly.

  Further, when the protective body having the electric shield layer provided on the inner surface of the protective case is used for the electric shield type cable connecting portion, the winding work of the aluminum tape or the copper tape can be omitted.

  Furthermore, when the protective body is provided with an electrically insulating support body that supports a plurality of core wires at a distance from each other at a distance from each other, for example, the electrical insulation between the three core wires constituting the power cable is supported. Since it can be secured by the body, there is no need for special measures such as contact between core wires, and connection construction can be performed more easily.

  Furthermore, the protector according to the present invention can be easily applied to a connection portion between a new cable and an existing cable in electrical equipment remodeling work, and in that case, the existing cable can be used without replacing the entire installation route with the new cable. The part can be connected to a new cable for effective use.

  Next, the best embodiment of the protector according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a protector according to the present invention, and FIG. 2 is a longitudinal sectional view showing a state where a cable connecting portion is protected by the protector of FIG. A protective body 1 shown in FIG. 1 includes an electrically insulating protective case 2 made of a hard plastic material having flame retardancy, and the protective case 2 includes an upper half 3 and a lower half 4. The

  Edges on one side of the upper half 3 and the lower half 4 are connected to each other by a hinge mechanism 2a, and the other edges are provided with an engaging portion 2b and a locking portion 2c, whereby The upper half 3 and the lower half 4 can be opened and closed with each other by the hinge mechanism 2a. By engaging the engaging portion 2b and the locking portion 2c, both can be kept closed. ing.

  A boundary portion 7 is formed by the two edge surfaces 5 of the upper half 3 and the two edge surfaces 6 of the lower half 4 opposite thereto. In addition, semicircular grooves 5 a are respectively formed on the two edge surfaces 5 of the upper half body 3, and semicircular grooves 6 a are respectively formed on the two edge surfaces 6 of the lower half body 4. And, the semicircular grooves 5a and 6a on the inlet side of the cable connection part form a circular cross-sectional insertion hole 8 that passes through the inlet side of the cable connection part, and the semicircular grooves 5a and 6a on the outlet side of the cable connection part, An insertion hole 9 having a circular cross section is formed through the outlet side of the cable connection portion. Further, as shown in the enlarged cross-sectional view of FIG. 1B, the inner surface of each of the insertion holes 8 and 9 is provided with a crimping portion 10 having a plurality of protrusions 10a that are spaced apart from each other in parallel in the axial direction.

  The shape of the crimping part 10 is not particularly limited as long as the upper and lower halves 3 and 4 can be closed and firmly supported by crimping the front and rear of the cable connection part from the periphery. For example, a large number of small protrusions may be formed in place of the ridges, or a tube having a low elasticity such as a rubber ring having a relatively high hardness is fixed to the inner surfaces of the insertion holes 8 and 9 by bonding or the like. But you can.

  Next, with reference to FIG. 2, a method for protecting the cable connecting portion using the protector according to the present invention will be described. FIG. 2 shows a connecting portion of a general control cable, and a plurality of (two in the illustrated example) core wires of the cable 20 to be connected are covered with an insulating layer 21 made of resin.

  Therefore, first, the protective layer 22 at those end portions is peeled off, and the insulating layer 21 only at the tip portion of the core wire is peeled off. And the cable connection part 25 is formed by inserting the exposed core part from the both ends of the sleeve 23, respectively, and crimping | bonding the part overlapped by the crimping tool from the circumference | surroundings. The sleeve 23 is made of an aluminum tubular body, and the outer periphery thereof is covered with a resin insulating layer. If necessary, an elastic cap 26 made of rubber or the like is attached to the end of the protective layer 22 as shown.

  In order to protect the cable connection portion 25 formed as described above with the protector 1 as shown in the drawing, first, the upper half 3 and the lower half 4 of the protective case 2 are opened, After the cable connecting portion 25 is arranged and the front and rear are positioned in the insertion holes 8 and 9, the upper half 3 and the lower half 4 are closed to engage the engaging portion 2b and the locking portion 2c.

  At that time, the front and rear of the cable connecting portion 25 are firmly fixed by being crimped by the crimping portions 10 formed on the inner surfaces of the insertion holes 8 and 9, so that the cable connecting portion 25 can sufficiently withstand the tensile force from both sides. it can. Moreover, since the circumference | surroundings of the cable connection part 25 are covered with the protective case 2, electrical insulation can fully be ensured.

  FIG. 3 is a longitudinal sectional view showing a state in which the cable connecting portion is protected by using the protector according to another embodiment. 1 is different from the example of FIG. 1 in that an electrical shield layer 27 for electrostatic shielding or the like is provided on the inner surface of the protective case 2, and the rest is similarly configured. Accordingly, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  The protective case 2 includes an upper half 3 and a lower half 4, and through holes 8 and 9 are formed in the boundary portion 7. Further, support portions 28 and 29 having a small inner diameter are formed inside the insertion holes 8 and 9. Then, an aluminum sheet or a copper sheet is adhered to the inner surface of the upper half 3 and the inner surface of the lower half 4 and the inner surfaces of the support portions 28 and 29 with an adhesive or the like to define the internal space 30 of the protective case 2. The electric shield layer 27 is formed by these sheet layers.

  The protector 1 shown in FIG. 3 is suitable for protecting a connection portion of an electric shield type cable 20 as shown. The electric shield type cable 20 has a plurality of core wires (two in the illustrated example) covered with a plastic insulating layer 21, and an aluminum tape or a copper tape is provided outside each core wire covered with the insulating layer 21. A shield tape 31 is wound around and the outside is protected by a protective layer 22 made of plastic or the like.

  In order to connect between the electric shield type cables 20, first, the protective layer 22, the insulating layer 21 and the shield tape 31 at their ends are peeled off as shown in the figure, and then the exposed core wire is overlapped. Covering with a resin-coated sleeve 23, the periphery of the sleeve is crimped with a crimping tool to form a cable connection portion 25. If necessary, an elastic cap 26 made of rubber or the like is attached to the end of the protective layer 22 as shown.

  Next, in order to protect the cable connecting portion 25 with the protector 1 as shown in the figure, first, the upper half 3 and the lower half 4 of the protective case 2 are opened, and the cable connecting portion 25 is opened there. 25 is inserted, and the front and rear thereof are positioned in the insertion holes 8 and 9, and then the upper half 3 and the lower half 4 are closed to engage the engaging portion and the locking portion.

  At that time, since the front and rear of the cable connecting portion 25 are firmly fixed by being crimped by the crimping portions 10 formed on the inner surfaces of the insertion holes 8 and 9, the cable connecting portion 25 can sufficiently withstand the tensile force from both sides. Can do. Moreover, since the circumference | surroundings of the cable connection part 25 are covered with the protective case 2, electrical insulation is fully ensured. Further, the cable connecting portion 25 is electrically shielded from the outside by the electric shield layer 27. The electrical shield layer 27 is connected to the shield tape 31 of the cable 20 with a ground wire (not shown).

  FIG. 4 is a longitudinal sectional view showing a state in which the cable connecting portion is protected using a protector according to still another embodiment, and FIG. 5 is a sectional view taken along the line AA. 1 is different from the example of FIG. 1 in that a support 34 that can support a plurality of core wires of the cable connecting portion 25 at intervals is provided. Configured. Accordingly, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  The protective case 2 is composed of an upper half 3 and a lower half 4, and through holes 8 and 9 are formed at the boundary portion 7 thereof. A hinge mechanism 32 is provided on one side of the boundary portion 7, and a lock mechanism 33 is provided on the other piece facing the hinge mechanism 32. The lock mechanism 33 includes an engaging portion 33 a provided in the upper half 3 and a corresponding engaging portion 33 b provided in the lower half 4, and the upper half 3 and the lower half 4. The upper half 3 and the lower half 4 can be kept closed by engaging the engaging portion 33a with the engaging portion 33b in a closed state.

  An electrically insulating support 34 made of hard plastic is provided in the internal space 30 of the protective case 2. The support 34 includes an upper support 35 fixed to the inner surface of the upper half 3 and a lower support 36 fixed to the inner surface of the lower half 4. As shown in FIG. 5, the three semicircular grooves 35a formed at the edge of the upper support 35 and the three semicircular grooves 36a formed at the edge of the lower support 36 closed the edge. Sometimes, three support holes 37 are formed which come into contact with each other and are parallel to each other at a distance.

  4 (FIG. 5) is suitable for protecting the connecting portion 25 of the power cable 20 to which a relatively high voltage is applied to the core wire. The power cable 20 is configured by covering three core wires with a plastic insulating layer 21 and protecting the outside of the insulating layer 21 with a protective layer 22 made of plastic or the like. The connecting method of the core wires between the power cables 20 is the same as the connection between the control cables 20 described with reference to FIG.

  Next, in order to set the cable connection portion 25 in the protected state as shown in the drawing, first, the upper half body 3 and the lower half body 4 of the protective case 2 are opened, and the cable connection portion 25 is provided in the inside. Deploy. Next, the three core portions of the cable connecting portion 25 are respectively supported by the three half-circular grooves 36a of the lower support 36, and the upper half 3 and the lower half 4 are closed. As a result, three support holes 37 are formed, and the three core wire portions of the cable connecting portion 25 are supported by the support holes 37 at intervals. At the same time, the front and rear of the cable connection portion 25 are crimped by the crimping portion 10 and firmly fixed.

  Next, the example which applied the protector of this invention to the connection part of the newly installed cable and the existing cable in electrical equipment remodeling construction is demonstrated. FIG. 6 is an electrical system diagram showing an example of modifying the installation path of an existing cable, and FIG. 7 is an electrical system diagram of an example in which a new cable and an existing cable are connected using the protector of the present invention.

  First, in FIG. 6, an existing cable 40 indicated by a solid line connects the cable tray 41 and the load facility 42 at the existing position. In this example, the cable laying path is changed between the load facility 42 and the cable tray 41 that move to a new position as indicated by the dotted line by the electrical facility modification work.

  In this example, as shown in FIG. 7, the end of the existing cable 40 extended from the cable tray 41 is connected to a new cable 43 extended from the load facility 42 at a new position. The connection can be made by using the protector 1 (not shown) of the present invention disposed in the connecting box 44. Thus, by connecting the existing cable 40 and the new cable 43 using the protector 1, the existing cable 40 can be effectively used without being discarded.

  The protector of the present invention can be used for efficient connection between cables.

The perspective view of the protector which concerns on this invention. The longitudinal cross-sectional view which shows the state which protected the cable connection part using the protector of FIG. The longitudinal cross-sectional view which shows the state which protected the cable connection part using the protector of other embodiment.

Furthermore, the longitudinal cross-sectional view which shows the state which protected the cable connection part using the protector of other embodiment. AA sectional drawing of FIG. The electrical system figure which shows the example of a modification of the installation path of the existing cable. The electrical system figure of the example which connected the newly installed cable and the existing cable using the protector of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Protective body 2 Protective case 2a Hinge mechanism 2b Engagement part 2c Locking part 3 Upper half part 4 Lower half part 5,6 Edge surface 5a, 6a Semi-circular groove 7 Boundary part 8,9 Insertion hole

DESCRIPTION OF SYMBOLS 10 Crimp part 10a Projection 20 Cable 21 Insulation layer 22 Protective layer 23 Sleeve 25 Cable connection part 26 Elastic cap 27 Electric shield layer 28, 29 Support part 30 Internal space

31 Shield Tape 32 Hinge Mechanism 33 Lock Mechanism 33a Engagement Part 33b Locking Part 34 Support 35 Upper Support 35a Semicircular Groove 36 Lower Support 36a Semicircular Groove 37 Support Hole 40 Existing Cable

41 Cable tray 42 Load equipment 43 New cable 44 Connection box

Claims (4)

  A protective case 2 for housing the cable connecting portion 25 is provided, and the protective case 2 has an upper half 3 and a lower half 4 that can be opened and closed, and the upper half 3 and the lower half 4 The insertion holes 8 and 9 for inserting the inlet side and the outlet side of the cable connection part 25 are formed in the boundary part 7, and the crimping part 10 for crimping the cable 20 is provided on the inner surface of each cable insertion hole 8 and 9. Protective body for cable connections.   The protector for a cable connection portion according to claim 1, wherein an electrical shield layer 27 is provided on the inner surface of the protective case 2.   3. The cable connection part protector according to claim 1, further comprising an electrically insulating support body that supports the plurality of core wires in the cable connection part 25 at intervals. 4. The cable connection part protector according to claim 1, wherein the cable connection part 25 is a connection part between a new cable 43 and an existing cable 40 in an electrical installation modification.

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