JP5999647B2 - Metal-coated diameter-enlarging jig for metal-coated cable, and method and structure for joining metal-coated cable and connecting copper pipe - Google Patents

Description

  The present invention relates to a metal-coated cable diameter-enlarging jig for a metal-coated cable capable of reducing the thermal influence on the insulating layer at a connection portion of the metal-coated cable, and a method for connecting a metal-coated cable and a connecting copper tube using the same. And a junction structure.

  In the connection structure of the metal-clad cable, the connection copper pipe that forms the connection box that protects the cable connection part and the metal coating (for example, aluminum corrugated pipe) at the end of the metal-clad cable are joined together by a lead builder. As a means of reducing the thermal effect on the insulation layer of the metal-coated cable by this leader, the diameter of the aluminum corrugated pipe at the end of the metal-coated cable is expanded, and a heat insulating sheet is provided between the aluminum corrugated pipe and the cable core. Arrangement has been proposed (Patent Document 1).

Japanese Patent Laid-Open No. 08-251799

  FIG. 5 shows a connection structure 100 using a conventional metal-coated cable 103. The metal-clad cable 103 is configured such that an aluminum corrugated pipe 115 is provided on the outer periphery of a cable core including a conductor portion 107, an internal semiconductive layer 109, an insulating layer 111, and an external semiconductive layer 113 from the center. A conductor connecting portion 105 that is a connecting portion with a conductor portion of another metal-clad cable (not shown) is covered with a rubber member 123. The outer peripheral surface of the rubber member 123 and the external semiconductive layer 113 are electrically connected by the metal shielding layer 125.

  The end of the aluminum corrugated tube 115 is expanded in diameter by inserting a wedge-shaped jig. At this time, since the aluminum corrugated tube 115 has a corrugated shape, one end of an air cylinder or the like is fixed to a gripping tool using the corrugated shape, and the wedge-shaped jig is attached to the other to attach the wedge corrugated tube 115 to the inside. And the end is extended in the outer circumferential direction to expand the diameter.

  A heat insulating sheet 127 is provided in the gap between the expanded corrugated aluminum pipe 115 and the cable core. In this state, the end of the aluminum corrugated pipe 115 and the connection copper pipe 121 in the connection box are joined together by a lead craft. Since the heat insulating sheet 127 is provided between the aluminum corrugated pipe 115 and the cable core, the inner insulating layer 111 is prevented from being affected by heat during the lead work of the aluminum corrugated pipe 115 and the connecting copper pipe 121. can do.

  However, instead of the aluminum corrugated tube as described in Patent Document 1, there is a case where a cable having a smooth metal coating (no corrugation such as a wave shape in the axial direction) is connected. In such a case, it is difficult to grip the metal coating using the wave shape. Therefore, it is difficult to expand the metal coating using an air cylinder.

  The present invention has been made in view of such a problem, and in particular, a metal of a metal-coated cable capable of easily expanding the diameter of the end of the metal coating with respect to a metal-coated cable having a smooth metal coating. It aims at providing a covering diameter expansion jig etc.

  In order to achieve the above-described object, the first invention is divided into a plurality of parts in the circumferential direction, and when combined, it becomes a substantially cylindrical shape, and the vicinity of one end has a tapered shape that decreases in diameter toward the tip. The metal sheath of the metal sheath cable is characterized in that the diameter of the metal sheath can be expanded by inserting and pushing the tip portion between the cable core and the metal sheath of the metal sheath cable. It is a radial jig.

  Since this metal-coated diameter-expanding jig is divided into a plurality of parts in the circumferential direction, it is possible to alternately push the respective divided pieces into the inner circumference of the metal coating. Therefore, it is possible to suppress the metal-coated diameter-expansion jig from being pushed obliquely with respect to the metal coating, and to push the metal-coated diameter-enlarging jig substantially uniformly in the circumferential direction. It is also easy to remove the metal-coated diameter-enlarging jig pushed into the metal coating.

  It is desirable that the vicinity of the one end of the metal-coated diameter increasing jig is a tapered surface whose inner surface gradually increases in diameter toward the tip, and the tip is a curved surface.

  By setting it as such a structure, it can prevent that the cushion layer formed in the outermost periphery of a cable core, for example is damaged with the front-end | tip of a metal covering diameter expansion jig.

  A second invention uses the metal-coated diameter-enlarging jig of the metal-coated cable according to the first invention, and a metal-coated cable having a smooth metal-coated layer in the axial direction on the outer periphery of the cable core; Inserting the tip of the metal-coated diameter-enlarging jig between the metal-coated layer and expanding the metal-coated layer, the expanded metal-coated layer and the connection copper tube of the metal-coated cable It is the joining method of a metal-coated cable and a connection copper pipe, characterized by joining via an intermediate metal pipe.

  According to this joining method, since a gap is formed between the cable core using a metal-coated diameter-enlarging jig, it is possible to prevent the insulation layer of the cable core from being affected by heat when joining with the intermediate metal pipe. Can do. Since the intermediate metal tube can have a smaller heat capacity than the connecting copper tube that protects the cable connection, it is shorter to join the intermediate metal tube through the intermediate metal tube than when the metal coating is directly bonded to the connecting copper tube. It takes time. For this reason, the heat influence to the insulating layer by joining can be suppressed. The connecting copper pipe is connected to the intermediate metal pipe. At this time, the connecting portion is separated from the insulating layer of the cable core by the intermediate metal pipe, so that the thermal influence on the insulating layer is weakened. Therefore, it is possible to prevent a decrease in the electrical characteristics of the cable due to the thermal deterioration of the insulating layer.

  The metal coating layer is an aluminum coating layer, the intermediate metal tube is an aluminum tube, the outer peripheral surface of the aluminum coating layer and the inner peripheral surface of one end of the aluminum tube are brought into contact and joined by welding, It is desirable that the outer peripheral surface of the other end of the aluminum tube and the inner peripheral surface of the connection copper tube are brought into contact with each other and joined by lead.

  Thus, since the aluminum coating and the aluminum tube are made of the same material, it is easy to join them by welding instead of lead work. Since the time for which heat is applied in welding is shorter than that in lead industry, it is possible to further reduce the influence of heat applied to the cable core as compared to joining by lead industry.

  3rd invention is a joining structure of the metal-coated cable which has a smooth metal coating layer in the outer periphery of a cable core, and a connection copper pipe, Comprising: The edge part of the said metal coating layer is diameter-expanded, and diameter expansion The outer peripheral surface of the metal coating layer thus formed and the inner peripheral surface of one end of the intermediate metal tube are contacted and joined by welding, and the outer peripheral surface of the other end of the intermediate metal tube and the inner surface of the connecting copper tube It is a joining structure of a metal-coated cable and a connecting copper pipe, characterized in that the peripheral surface comes into contact and is joined by lead craft.

  By setting it as such a structure, there is no thermal deterioration of an insulating layer and the junction structure of the metal-coated cable and connection copper pipe which was excellent in the electrical property can be obtained.

ADVANTAGE OF THE INVENTION According to this invention, the metal coating diameter expansion jig etc. of the metal coating cable etc. which can expand the diameter of the edge part of a metal coating easily with respect to the metal coating cable especially with smooth metal coating can be provided. .
Moreover, according to the joining method and the joining structure of the present invention, it is possible to reduce the thermal influence on the cable core and prevent the deterioration of the electrical characteristics due to the thermal deterioration of the cable insulating layer.

Sectional drawing which shows the connection structure 1. FIG. FIG. 2 is an enlarged view of a part A in FIG. The perspective view which shows the diameter expansion jig 35. FIG. (A) is sectional drawing which shows the state which expands the metal coating 15 by the diameter expansion jig 35, (b) is the B section enlarged view of (a). Sectional drawing which shows the conventional connection structure 100. FIG.

  A connection structure 1 shown in FIG. 1 is a connection structure between a metal-coated cable 3 and a connection copper tube 21. As shown in FIG. 2, the metal-coated cable 3 includes a conductor portion 7, an internal semiconductive layer 9, an insulating layer 11, an external semiconductive layer 13, a cushion layer 27, and a metal cover 15 from the center side. In the present invention, the conductor portion 7, the inner semiconductive layer 9, the insulating layer 11, the outer semiconductive layer 13, and the cushion layer 27 are collectively referred to as a cable core.

  The predetermined length of the end portion of the metal coating 15 is expanded to form an expanded diameter portion 33. In the enlarged diameter portion 33, a gap is formed between the metal coating 15 and the cushion layer 27. The metal coating 15 is a smooth metal coating having no irregularities such as wave shapes on the surface with respect to the axial direction. The metal coating 15 is, for example, an aluminum coating. At a portion other than the enlarged diameter portion 33, the metal coating 15 and the cushion layer 27 are in close contact with each other.

  As shown in FIG. 1, the conductor portion 7 of the metal-coated cable 3 is abutted with the conductor portions of other metal-coated cables (not shown), and the conductor portions 7 are connected by the conductor connection portion 5. A rubber member 23 is provided so as to cover the conductor connection portion 5. A metal shielding layer 25 is provided on the outer periphery of the rubber member 23 and is electrically connected to the outer semiconductive layer 13 of the metal-coated cable 3. Moreover, the connection copper pipe 21 is provided so that the connection part of the metal covering cables which covered the rubber member 23 may be covered.

  As shown in FIG. 2, the metal coating 15 and the connection copper tube 21 are joined via an intermediate metal tube 19. The intermediate metal tube 19 is preferably an aluminum tube made of the same material as the metal coating 15, for example. The connection copper pipe 21 is a copper pipe constituting an intermediate connection box or a termination connection box.

  Here, the volume of the intermediate metal tube 19 is sufficiently small compared to the connection copper tube 21, and the heat capacity of the intermediate metal tube 19 is smaller than that of the connection copper tube 21. Therefore, the temperature of the intermediate metal tube 19 rises quickly when heat is applied, compared to the connection copper tube 21. For this reason, welding, lead work, etc. can be performed with a smaller amount of heat. That is, by using the intermediate metal tube 19, the intermediate metal tube 19, the metal coating 15, and the connection copper tube 21 can be obtained in a shorter time than when the metal cover 15 and the connection copper tube 21 are directly joined. Can complete the joining.

  Further, if both the intermediate metal tube 19 and the metal coating 15 are made of aluminum, the intermediate metal tube 19 and the metal coating 15 can be joined by welding. In this case, the intermediate metal tube 19 and the metal coating 15 are joined by welding so that the inner peripheral surface of one end of the intermediate metal tube 19 and the outer peripheral surface of the enlarged diameter portion 33 of the metal coating 15 are in contact with each other. (Welded portion 31). The outer peripheral surface of the other end portion of the intermediate metal tube 19 is in contact with the inner peripheral surface of the end portion of the connection copper tube 21, and the intermediate metal tube 19 and the connection copper tube 21 are joined by lead processing (lead Engineering Department 29).

  Welding can be done in a shorter time than lead. Therefore, compared with the case where the metal coating 15 and the connection copper pipe 21 are joined by lead work, the thermal influence applied to the cable core can be reduced. Thereby, it can suppress that the insulating layer 11 etc. of a cable core deteriorate with heat, and the electrical property of the metal-clad cable 3 falls.

  Next, a method for forming the enlarged diameter portion 33 on the metal coating 15 will be described. FIG. 3 is a perspective view showing a diameter expansion jig 35 for expanding the diameter of the end portion of the metal coating 15. The diameter expansion jig 35 has a substantially cylindrical shape as a whole by combining a plurality of divided pieces 39 divided in the circumferential direction.

  A flange 37 is provided on one end side of the diameter expansion jig 35. The collar part 37 is a site | part by which the outer periphery was expanded with respect to the other site | part. An external taper portion 41 is provided on the other end side of the diameter expansion jig 35. The external taper portion 41 has a tapered shape in which the outer diameter is gradually reduced as it goes to the tip of the diameter expansion jig 35.

  Further, an inner taper portion 43 whose inner diameter increases toward the tip is formed on the inner peripheral surface of the tip of the diameter expanding jig 35. Furthermore, the distal end of the diameter expansion jig 35 (the distal end of the outer tapered portion 41 and the inner tapered portion 43) is formed in a curved surface shape in the axial cross section. The width of the inner tapered portion 43 (dimension in the direction intersecting with the radial direction of the diameter expanding jig) is narrower than the width of the outer tapered portion 41.

  The inner diameter of the diameter expansion jig 35 is slightly larger than the outer diameter of the cable core of the metal-coated cable to be used, and the outer diameter of the diameter expansion jig 35 (outside the portion other than the flange portion 37 and the external taper portion 41). The diameter is designed according to the inner diameter of the metal coating 15 after the diameter expansion.

  In order to increase the diameter of the metal coating 15 of the metal-coated cable 3 using the diameter-enlarging jig 35, first, as shown in FIG. 4A, the metal coating is performed at a predetermined length position at the end of the metal-coated cable 3. 15 and the cushion layer 27 are cut, and the inner conductor portion 7, the inner semiconductive layer 9, the insulating layer 11, and the outer semiconductive layer 13 are exposed to a length necessary for connection.

  Next, the tip (external taper portion 41 side) of the diameter expansion jig 35 is applied to the gap between the cushion layer 27 (cable core) and the metal coating 15, and the rear surface of the flange portion 37 is tapped in the direction of arrow C in the figure. However, the diameter expansion jig 35 is pushed into the gap between the cushion layer 27 and the metal coating 15 little by little. At this time, by pushing the divided pieces 39 one by one in sequence, the diameter expansion jig 35 can be pushed between the cushion layer 27 and the metal coating 15 substantially uniformly in the circumferential direction of the metal-coated cable 3.

  By pushing all the divided pieces 39 by a predetermined length (a length that can secure the enlarged diameter portion 33), the diameter expansion of the metal coating 15 is completed. The diameter expansion jig 35 can be extracted by tapping the collar portion 37 of each divided piece 39 backward.

  When this diameter expansion jig 30 is used, the diameter of the metal coating 15 is gradually increased by the external taper portion 41, so that the diameter expansion is easy. Further, the internal taper portion 43 can suppress the tip of the diameter expansion jig 35 from biting into the cushion layer 27. Therefore, damage to the cushion layer 27 can be suppressed. In addition, since the tip of the diameter expansion jig 35 is a curved surface, damage to the contact portion can be suppressed even when the tip of the diameter expansion jig 35 is in contact with the metal coating 15 or the cushion layer 27.

  As described above, according to the present embodiment, even when the metal coating 15 is not a corrugated tube and is smooth in the axial direction, the end of the metal coating 15 is easily expanded in diameter so that a gap with the cable core is formed. Can be formed. Therefore, when the metal coating 15 and the intermediate metal tube 19 are joined, it is possible to prevent the insulating layer 11 of the cable core from being thermally deteriorated and the electrical characteristics from being deteriorated.

  Moreover, since the diameter expansion jig 35 is divided into a plurality of parts in the circumferential direction, each divided piece 39 can be sequentially inserted into the gap between the metal coating 15 and the cable core little by little. Therefore, the divided pieces 39 can be inserted into the gap between the metal coating 15 and the cable core substantially uniformly in the circumferential direction. For this reason, it is possible to prevent the diameter expansion jig 35 from being inclined and being damaged to damage the cable core or the like.

  In addition to the outer tapered portion 41 for gradually expanding the diameter of the metal coating 15, an inner tapered portion 43 is also formed on the inner peripheral surface of the tip of the diameter expanding jig 35. Therefore, the tip of the diameter expanding jig 35 can be prevented from coming into contact with the cushion layer 27 and damaging the cushion layer 27. Further, even if the tip of the diameter expanding jig 35 comes into contact with the cushion layer 27 or the like, the tip of the diameter expanding jig 35 is a curved surface, so that damage to the cushion layer 27 or the like can be suppressed.

  Further, the metal coating 15 and the connection copper tube 21 are joined via the intermediate metal tube 19. Since the intermediate metal tube 19 has a smaller heat capacity than the connection copper tube 21, the intermediate metal tube 19 can be welded or leaded with a smaller amount of heat than the connection copper tube 21. That is, by using the intermediate metal pipe 19, the thermal influence on the cable core can be reduced as compared with the case where the metal coating 15 and the connection copper pipe 21 are directly joined.

Further, if the metal coating 15 and the intermediate metal tube 19 are both made of aluminum and are made of the same material, the metal coating 15 and the intermediate metal tube 19 can be easily welded. Welding can be done in a shorter time than lead workers. Therefore, the metal coating 15 and the intermediate metal tube 19 can be joined in a short time compared to the case of joining by lead craft.
Furthermore, the thermal influence on the cable core when the connecting copper pipe 21 is connected to the intermediate metal pipe 19 by lead work is that the distance from the contact portion between the cable core and the metal coating 15 to the place where the lead work is performed is intermediate. Since it is separated by the metal tube 19, it is possible to further suppress the influence of heat on the insulating layer 11 of the cable core and suppress the deterioration of its electrical characteristics.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1 ......... Connection structure 3 ......... Metal-coated cable 5 ......... Conductor connection part 7 ......... Conductor part 9 ......... Internal conductive layer 11 ......... Insulating layer 13 ......... External semiconductive layer 15 ... Metal coating 19 Intermediate metal pipe 21 Connecting copper pipe 23 Rubber member 25 Metal shielding layer 27 Cushion layer 29 Lead working part 31 Welding part 33 ......... Expanded diameter portion 35 ......... Expanded diameter jig 37 ......... Bridge 39 ......... Divided piece 41 ......... Outer tapered portion 43 ......... Internal tapered portion 100 ......... Connection structure 103 ......... Metal Covered cable 105 ......... Conductor connecting part 107 ......... Conductor part 109 ......... Inner conductive layer 111 ......... Insulating layer 113 ......... Outer semiconductive layer 115 ......... Aluminum corrugated pipe 121 ......... Connecting copper Tube 123 ... Rubber member 125 ... Metal shielding layer 127 ... Thermal insulation sheet

Claims (5)

It is divided into a plurality of parts in the circumferential direction.
The vicinity of one end has a tapered shape that decreases in diameter toward the tip,
A metal-coated diameter-enlarging jig for a metal-coated cable, wherein the diameter of the metal-coated cable can be increased by inserting and pushing a tip portion between a cable core and a metal-coated cable.   2. The metal coating according to claim 1, wherein the vicinity of the one end of the metal-coated diameter-enlarging jig is a tapered surface whose inner surface gradually increases in diameter toward the tip, and the tip is a curved surface. Metal-coated diameter expansion jig for cables. Using the metal-coated diameter expansion jig of the metal-coated cable according to claim 1 or 2,
For a metal-coated cable having a metal coating layer that is smooth in the axial direction on the outer periphery of the cable core, a tip of the metal-coated diameter expansion jig is inserted between the cable core and the metal coating layer, and the metal Expand the coating layer,
A method of joining a metal-coated cable and a connection copper tube, wherein the expanded metal coating layer and the connection copper tube of the metal-coated cable are joined via an intermediate metal tube. The metal coating layer is an aluminum coating layer;
The intermediate metal tube is an aluminum tube;
The outer peripheral surface of the aluminum coating layer and the inner peripheral surface of one end of the aluminum tube are brought into contact and joined by welding,
The joining of the metal-coated cable and the connecting copper pipe according to claim 3, wherein the outer peripheral surface of the other end of the aluminum pipe and the inner peripheral face of the connecting copper pipe are brought into contact with each other and joined by lead work. Method. A connection structure between a metal-coated cable having a smooth metal coating layer in the axial direction on the outer periphery of the cable core and a connecting copper pipe,
The end portion of the metal coating layer is expanded, the outer peripheral surface of the expanded metal coating layer and the inner peripheral surface of one end portion of the intermediate metal tube are contacted and joined by welding,
A joining structure of a metal-coated cable and a connecting copper tube, wherein the outer peripheral surface of the other end of the intermediate metal tube and the inner peripheral surface of the connecting copper tube come into contact with each other and are joined by lead work.

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