JP2014039443A - Power cable connection structure and insulation member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure of a compact power cable having an excellent connection workability.SOLUTION: An insulation member 19 has an approximately cylindrical shape and consists of an enlarged diameter section 20a having a large outside diameter and a reduced diameter section 20b having a small outside diameter. An end part of the insulation member 19 in the enlarged diameter section 20a is a connection section 41a which is a connection section with a copper tube 15a. An end part of the insulation member 19 in the reduced diameter section 20b is a connection section 41b which is a connection section with the copper tube 15b. A plurality of holes 43a, 43b are provided to the connection sections 41a, 41b, respectively. Grooves 18a, 18b are provided on the outer peripheral surface in the vicinity of the holes 43a, 43b respectively in the circumferential direction. When the respective copper tubes 15a, 15b are fitted to both ends of the insulation member 19 in an axis direction, the positions of the holes 43a, 45a are matched and the positions of the holes 43b, 45b are matched.

Description

  The present invention relates to a connection structure particularly suitable for a power cable used as an underground power transmission line and an insulating member used therefor.

  In a connection portion between power cables having a metal layer, a ground line is drawn from the metal layer, and each is grounded individually, or a cross-bond connection process is performed between three-phase cables. In a place where such a cross bond connection process or the like is performed, the metal layers of the connected power cable are insulated so as not to conduct each other (for example, Patent Document 1 and Patent Document 2).

Japanese Utility Model Publication No. 01-92759 Japanese Patent Laid-Open No. 08-149679

  FIG. 7 shows a conventional connection structure 100 between power cables. In the connection structure 100, the ends of the electric wires 103a and 103b are connected to each other. The electric wires 103a and 103b have a conductor part 105 inside, and an insulating part 107, a semiconductive part 109, an aluminum corrugated pipe 111, and an outer sheath 113 are provided on the outer peripheral side of the conductor part 105 from the inside.

  The ends of the conductor part 105 are connected by a conductor connection part 106. A rubber member 137 having a predetermined thickness is provided on the outer periphery of the connecting portion between the conductor portions 105 to ensure insulation. Also, a copper tube 115a, which is a metal tube, is provided so as to cover the rubber member 137.

  The copper tube 115a is disposed so that the end portion thereof is electrically connected to the aluminum corrugated tube 111 of the one electric wire 103a. In addition, a copper tube 115b is disposed in the aluminum corrugated tube 111 of the other electric wire 103b so that the end portion is conductive. The copper tubes 115a and 115b and the aluminum corrugated tube 111 are connected by, for example, solder, and a waterproof tape or the like is wound around the outer periphery.

  Flange portions 117a and 117b are provided at opposite ends of the copper tubes 115a and 115b, respectively. The flange portions 117a and 117b are joined to both end portions of the insulating member 119, respectively. That is, the copper tubes 115a and 115b are joined via the insulating member 119 and do not conduct with each other. The insulating member 119 is disposed on the electric wire 103b side with respect to the position of the connecting portion (conductor connecting portion 106) of the electric wires 103a and 103b. In addition, an O-ring or the like (not shown) is provided on the joint surface between the flange portions 117a and 117b and the insulating member 119 in order to ensure waterproofness.

  Metal shielding layers 135a and 135b are disposed on the outer circumferences of the aluminum corrugated tube 111 and the semiconductive portion 109 of the electric wires 103a and 103b, respectively. The ends of the metal shielding layers 135a and 135b are arranged so as to be separated from each other on the outer periphery of the rubber member 137. That is, the metal shielding layers 135a and 135b do not conduct with each other.

  The copper tube 115a is provided with a lid 131, and a waterproof compound can be poured into the inside through a hole provided with the lid 131. Further, terminal portions 121a and 121b are provided on the outer peripheral surfaces of the copper tubes 115a and 115b so as to protrude in the radial direction. The terminal portions 121a and 121b are, for example, plate-like members, and have a shape that allows connection of connecting wires or the like.

  The inner conductor 127 and the outer conductor 125 of the coaxial cable 123 are connected to the terminal portions 121a and 121b, respectively. That is, the copper tubes 115a and 115b are electrically connected to the inner conductor 127 and the outer conductor 125, which are lead wires. As described above, the inner conductor 127 and the outer conductor 125 are grounded or the like outside the connection structure 100.

  In such a connection structure, a connection portion between the inner conductor 127 and the outer conductor 125, which are lead wires, and the terminal portions 121a and 121b protrudes in one radial direction of the connection structure. At this time, in order to prevent the outer conductor 125 and the inner conductor 127 from interfering with the flange portions 117 a and 117 b and the insulating member 119, the connecting portions between the terminal portions 121 a and 121 b and the outer conductor 125 and the inner conductor 127 are connected to the insulating member 119. It is necessary to arrange outside.

For this reason, in such a connection structure, there exists a problem that the outer diameter of the whole connection structure becomes large.
Further, since the terminal portion protrudes, the outer shape of the connection structure becomes complicated, and it is difficult to cover the entire outer periphery of the connection structure with a shrink tube or the like, or to cover the connection portion with a waterproof tape or the like. For this reason, it is necessary to use waterproof putty etc., and there exists a problem that an operation | work is complicated. Moreover, the waterproof process in such a complicated shape may cause a decrease in the waterproof function due to a construction error or the like.

  Further, in order to bolt the flange portions 117a and 117b and the insulating member 119, it is necessary to embed simple or the like in the insulating member 119 in advance. For this reason, there exists a problem that the manufacturing cost of the insulating member 119 becomes high.

  Further, in the connection structure 100, it is necessary to perform waterproofing by disposing an O-ring or the like on the respective facing surfaces of the insulating member 119 facing the flange portions 117a and 117b. Therefore, groove processing for the O-ring is required for each facing surface, and an operation space for arranging the O-ring and tightening the bolt is required. For this reason, it is necessary to arrange | position joining parts, such as a volt | bolt, to the outer peripheral side rather than the radial direction of joining structure. Accordingly, there is a problem that the diameter of the joining structure is increased.

  Moreover, the coffin box 129 may be used so that the whole connection part may be covered. After covering the entire coffin box 129, a waterproof compound can be poured into the inside from the lid 133. If such a coffin box is used, it is possible to improve the waterproofness of the whole connection structure.

  However, when the coffin box 129 is used, there is a problem that the connection structure is further enlarged. In addition, there is a problem that a large amount of waterproofing compound poured into the coffin box 129 is required.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a compact power cable connection structure that is excellent in connection workability.

  In order to achieve the above-described object, a first invention is a power cable connection structure, in which a first metal tube conducting with a shielding layer of a power cable on one side and a shielding layer of a power cable on the other side are provided. A second metal tube electrically connected to the first metal tube, a second lead wire electrically connected to the first metal tube, a second lead wire electrically connected to the second metal tube, the first metal tube, and the A cylindrical insulating member disposed between the second metal pipe, the first metal pipe covering a connection portion between the power cables, and around the power cable on the other side. The connecting portion of the insulating member with the second metal tube is connected to the second metal tube through the insulating member, and the connecting portion of the insulating member with the first metal tube is an outer diameter of the connecting portion of the insulating member with the first metal tube. A diameter-reduced portion having a smaller diameter than the end portions of the first metal tube and the second metal tube A connection structure of the power cable, characterized in that connected the insulating member ends each axially fitted in.

  According to the connection structure of the power cable having such a configuration, the outer diameter of the connection portion with the second metal tube can be made smaller than the outer shape of the connection portion with the first metal tube. Therefore, it is not necessary to make the connecting portion of the second metal tube having a relatively small outer diameter unnecessarily large.

  In addition, since the first metal tube and the second metal tube can be fitted in the axial direction with respect to both ends of the insulating member, a flange projecting in the radial direction at the connecting portion between the insulating member and each metal tube A part etc. become unnecessary. Therefore, the outer diameter of the connection structure can be reduced. Moreover, compared with the connection structure using the conventional flange part, the space of a connection operation | work can be ensured more reliably. Therefore, the connection workability is also excellent.

  The first lead wire is connected to the first metal tube via a lead wire, a connection portion between the first lead wire and the lead wire, and the second lead wire and the second metal. It is desirable that the connecting portion with the tube is disposed on the reduced diameter portion of the insulating member or the outer peripheral portion of the second metal tube.

  By setting it as such a structure, the terminal part etc. which are used for the connection part of each lead wire and each connection object can be arrange | positioned on the outer periphery of the 2nd metal pipe with a relatively small outer diameter. Therefore, it is not necessary to arrange a terminal portion or the like on the outer peripheral portion of the first metal tube having a relatively large outer diameter. That is, the connection structure can be further downsized.

  A substantially cylindrical protective member is disposed on the outer periphery of the connecting portion between the first lead wire and the conducting wire and the connecting portion between the second lead wire and the second metal tube, and at least It is desirable that a part of the first metal tube and the protective member are covered with a waterproof tube.

  By adopting such a configuration, it is possible to simplify the outer shape of the connection portion and the like of each lead wire, and to prevent formation of a gap or the like when the waterproof tube is covered. Therefore, the waterproofness of the connection structure can be improved.

  Holes are formed in corresponding portions at both ends of the insulating member and ends of the first metal tube and the second metal tube connected to the insulating member, and the holes of the insulating member A groove is formed in the circumferential direction on the outer peripheral surface in the vicinity of the, and in a state where the insulating member and the first metal tube and the second metal tube are fitted, a connection member is inserted into the hole, A resin-impregnated tape is wound so as to cover the connecting member and the groove, and end portions of the first metal tube and the second metal tube are respectively connected to both end portions of the insulating member. Is desirable.

  By setting it as such a structure, the movement with respect to the axial direction of the insulation member of a 1st metal tube and a 2nd metal tube can be controlled with a connection member. For this reason, work such as bolting is unnecessary. Therefore, it is excellent in connection workability. Further, it is not necessary to embed a thimble for bolting the insulating member or to perform screw processing. Therefore, an inexpensive insulating member can be used.

  Further, since the resin-impregnated tape is wound so as to cover the groove formed in the insulating member, the connecting member can be securely fixed, and the connecting member can be prevented from coming off or moving. At this time, since the resin enters the groove and hardens, the resin-impregnated tape can be reliably fixed to the insulating member. Therefore, the first metal tube and the second metal tube can be reliably bonded to the insulating member.

  A metal tape may be further provided so as to cover the connection member, and the resin-impregnated tape may be wound around an outer periphery of the metal tape.

  By setting it as such a structure, the clearance gap etc. which are formed in the connection member vicinity can be block | closed with a metal tape. Therefore, it is possible to reliably ensure waterproofness at the connection portion between each metal tube and the insulating member. Further, it is not necessary to use an O-ring separately, and the groove processing for the O-ring on the insulating member is not necessary. Therefore, it is not necessary to make the insulating member thick so that an O-ring can be installed, and a lightweight and low-cost insulating member can be used.

  2nd invention is an insulating member used for the connection structure of an electric power cable, Comprising: The said insulating member has a connection part with a metal tube in both ends, respectively, and the connection part of one edge part is the other end. The connecting portion of the insulating member is reduced in diameter, and a hole is provided in each of the connecting portions at both ends of the insulating member, and a groove is provided in the circumferential direction in the vicinity of the hole on the outer peripheral surface of the insulating member. Is an insulating member.

  According to the insulating member having such a configuration, it is used for the connecting portion of the power cable, and is excellent in connection workability at the time of connection. In addition, it is possible to reduce the size of the entire connection structure.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in connection workability | operativity and can provide the connection structure of a compact power cable, etc.

It is sectional drawing which shows the connection structure 1, and is B arrow view of FIG. It is sectional drawing which shows the connection structure 1, and is A arrow directional view of FIG. The perspective view which shows the insulating member 19. FIG. Sectional drawing which shows the connection process of the insulating member 19 and copper pipe 15a, 15b. Sectional drawing which shows the connection process of the insulating member 19 and copper pipe 15a, 15b. Sectional drawing which shows the connection process of the insulating member 19 and copper pipe 15a, 15b. The figure which shows the conventional connection structure 100. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the connection structure 1 is a connection structure of electric wires 3a and 3b which are power cables. The electric wires 3a and 3b have a conductor portion 5 therein, and an insulating portion 7, a semiconductive portion 9, an aluminum corrugated tube 11, and an outer sheath 13 are formed on the outer periphery of the conductor portion 5 in this order from the inside. In the present invention, the configuration of the electric wires 3a and 3b is not limited to the illustrated example.

  The conductor parts 5 are connected to each other by a conductor connection part 6. The conductor connection portion 6 is, for example, a metal sleeve. A rubber member 37 is provided on the outer peripheral portion of the conductor connection portion 6 in order to ensure insulation. The rubber member 37 is formed with a predetermined thickness in order to ensure insulation in the vicinity of the conductor connecting portion 6. That is, the outer peripheral part (substantially central part of the rubber member 37) in the vicinity of the conductor connecting part 6 is a large diameter part.

  Metal shielding layers 35a and 35b are arranged on the outer circumferences of the aluminum corrugated tube 11 and the semiconductive portion 9 of the electric wires 3a and 3b, respectively. The metal shielding layers 35a and 35b are, for example, metal meshes. The end portions of the metal shielding layers 35 a and 35 b are arranged so as to be separated from each other on the outer periphery of the rubber member 37. That is, the metal shielding layers 35a and 35b do not conduct with each other.

  A copper tube 15a, which is a first metal tube, is provided on the outer peripheral portion of the rubber member 37 so as to cover the vicinity of the conductor connecting portion in order to protect each insulating portion, the conductor connecting portion 6 and the like. The end of the copper tube 15a is joined so as to be electrically connected to the aluminum corrugated tube 11 of the electric wire 3a. The aluminum corrugated tube 11 protects the internal conductor portion 5 and the like, and functions as a shielding layer for the electric wires 3a and 3b. Further, a lid 31 is provided on the copper tube 15a, and a waterproof compound can be poured into the copper tube 15a from a hole closed by the lid 31.

  The end of the copper tube 15b, which is the second metal tube, is joined so as to be electrically connected to the aluminum corrugated tube 11 of the electric wire 3b, similarly to the copper tube 15a. The ends of the copper tubes 15a and 15b and the aluminum corrugated tube 11 are joined by, for example, solder, and a waterproof tape or the like is wound around the outer periphery.

  An insulating member 19 is connected to each end of the copper pipes 15a and 15b on the opposite side to the connection with the aluminum corrugated pipe 11. The insulating member 19 is a substantially cylindrical member. That is, the copper tubes 15 a and 15 b are joined via the insulating member 19. For this reason, the copper tubes 15a and 15b do not conduct each other. The details of the insulating member 19 and the connection structure between the insulating member 19 and the copper tubes 15a and 15b will be described later.

  The copper tube 15 b is disposed closer to the electric wire 3 b than the large diameter portion of the rubber member 37. That is, the copper tube 15a is arranged so as to cover most of the rubber member 37, but the rubber member 37 or the like is not arranged inside the copper tube 15b, so the copper tube 15b is compared with the copper tube 15a. Thus, it is configured with a small diameter. The insulating member 19 has a large outer diameter on the connection portion side with the copper tube 15a and a small outer diameter on the connection portion side with the copper tube 15b. That is, both ends of the insulating member 19 are formed with outer diameters corresponding to the outer diameters of the copper tubes 15a and 15b, respectively, and the outer shape of the insulating member 19 has a step shape in the axial direction.

  As shown in FIG. 1, a flat knitted wire 26 is connected to the outer peripheral surface of the copper tube 15a by solder or the like. The flat knitted wire 26 is a conducting wire knitted flat. The flat knitted wire 26 is drawn out to the copper tube 15b side through the outer periphery of the insulating member 19 so as to be flat in the circumferential direction, and this flat knitted wire 26 is the first lead-out wire on the outer peripheral side of the copper tube 15b. The internal conductor 27 that is a wire is connected to the terminal 28. That is, the inner conductor 27 of the coaxial cable 23 is electrically connected to the copper tube 15 a via the flat knitted wire 26.

  Further, as shown in FIG. 2, the outer conductor 25 as the second lead wire and the copper tube 15 b are connected by the terminal portion 21 on the outer peripheral side of the copper tube 15 b. That is, the outer conductor 25 of the coaxial cable 23 is electrically connected to the copper tube 15b. The inner conductor 27 may be connected to the terminal portion 21 and the outer conductor 25 may be connected to the flat knitted wire 26.

  The connection part (terminal 28) between the inner conductor 27 and the flat braided wire 26 and the connection part (terminal part 21) between the outer conductor 25 and the copper pipe 15b are both on the copper pipe 15b side (the contraction of the insulating member 19). It arrange | positions at the outer peripheral part of the copper pipe 15b side from the diameter part 20b. In addition, the connection portion (terminal portion 21) between the outer conductor 25 and the copper tube 15b is spaced a predetermined distance in the circumferential direction with respect to the position of the connection portion (terminal 28) between the inner conductor 27 and the flat braided wire 26. Arranged.

  As described above, the connecting portion of the insulating member 19 with the copper tube 15b has a reduced diameter, and the copper tube 15b has a smaller diameter than the copper tube 15a. For this reason, the connection structure 1 is formed by arranging the connection portions (terminal portion 21 and terminal 28) of the internal conductor 27 and the external conductor 25, respectively, spaced apart in the circumferential direction on the outer periphery on the small diameter copper tube 15b side. It can be downsized.

  A substantially cylindrical resin pipe 30 is provided on the outer periphery of the copper tube 15b so as to cover a part (small diameter portion) of the insulating member 19 and a part of the copper tube 15b. The resin pipe 30 functions as a protection member for protecting the connection portions of the inner conductor 27 and the outer conductor 25. The resin pipe 30 may be made of any material as long as it has a certain degree of shape retention.

  The resin pipe 30 is divided into a plurality of parts (for example, divided into two parts) in the circumferential direction, and is arranged so as to cover the part. Moreover, a notch part is formed in the outer peripheral surface of the resin pipe 30 as needed. By forming the notch, even if the diameter of the resin pipe 30 is reduced, it is possible to avoid interference between the terminal portion 21 and the terminal 28 and the resin pipe 30.

  A protective cover 32 is provided at the end of the resin pipe 30. The protective cover 32 is provided with a drawing port, and the coaxial cable 23 is drawn to the outside. That is, the inner conductor 27 and the outer conductor 25, which are lead wires that are electrically connected to the copper tubes 15a and 15b, are drawn out as the coaxial cable 23 to the outside of the connection structure 1 and subjected to a grounding process or the like.

  Further, a waterproof tube is covered as shown by a dotted line in FIGS. 1 and 2 so as to cover all or at least a part of the resin pipe 30 and the copper tube 15a, and the waterproofing of the connection structure 1 is performed. . Although details are omitted, the boundary between the protective cover 32, the electric wire 3b, and the coaxial cable 23 is waterproofed with a waterproof tape (not shown), and water enters the connection structure 1 inside. Is prevented. At this time, since the connection structure 1 does not have protrusions (terminal portions 121a and 121b and conductors connected to these in FIG. 7) that protrude from the outer peripheral portion, waterproofing is easy.

  Next, the insulating member 19 will be described in detail. As shown in FIG. 3, the insulating member 19 is a substantially cylindrical member, and includes a large diameter portion 20 a having a large outer diameter and a small diameter portion 20 b having a smaller outer diameter than the large diameter portion 20 a. That is, the insulating member 19 has a step shape between the enlarged diameter portion 20a and the reduced diameter portion 20b. The insulating member 19 is a substantially cylindrical insulator formed of a resin such as epoxy.

  An end of the insulating member 19 in the enlarged diameter portion 20a serves as a connection portion 41a that is a connection portion with the copper tube 15a. Moreover, the edge part in the reduced diameter part 20b of the insulating member 19 becomes the connection part 41b which is a connection part with the copper pipe 15b. The connection portions 41a and 41b are provided with a plurality of holes 43a and 43b, respectively. In addition, grooves 18a and 18b are provided in the circumferential direction on the outer peripheral surface in the vicinity of the holes 43a and 43b, respectively. The holes 43a and 43b may be through holes or bottomed.

  Next, a method for connecting the insulating member 19 and the copper tubes 15a and 15b will be described. First, as shown in FIG. 4, the connecting portion 41a of the insulating member 19 is inserted into the end of the copper tube 15a (in the direction of arrow C in the figure). Similarly, the connecting portion 41b of the insulating member 19 is inserted into the end portion of the copper tube 15b (in the direction of arrow D in the figure). The outer diameter of the connecting portion 41a substantially corresponds to the inner diameter of the copper tube 15a, and the outer diameter of the connecting portion 41b substantially corresponds to the inner diameter of the copper tube 15b. That is, the copper pipes 15a and 15b are fitted to each other so that the inner peripheral surfaces of the copper tubes 15a and 15b are in contact with the outer peripheral surfaces of the connecting portions 41a and 41b of the insulating member 19.

  At this time, a hole 45a is provided in a portion of the copper tube 15a corresponding to the hole 43a in the connecting portion 41a. Moreover, the hole 45b is provided in the site | part of the copper pipe 15b corresponding to the hole 43b in the connection part 41b. Therefore, when the copper pipes 15a and 15b are fitted in the axial direction with respect to both ends of the insulating member 19, the positions of the holes 43a and 45a are matched, and the positions of the holes 43b and 45b are matched.

  With the copper tubes 15a, 15b and the connecting portions 41a, 41b fitted, the pins 47 are inserted so as to penetrate the holes 43a, 43b and the holes 43b, 45b (in the direction of arrow E in the figure). The pin 47 is a connecting member between the insulating member 19 and the copper tubes 15a and 15b, and may be a bolt or the like, for example. Since the holes 43a, 43b, 45a, 45b are not threaded, the pins 47 are only inserted into the holes 43a, 45a and the holes 43b, 45b, respectively, and are completely fixed. Never happen.

  FIG. 5 is a view showing a state in which the copper tubes 15 a and 15 b are fitted to both ends of the insulating member 19 and the pins 47 are inserted. By inserting the pin 47, the copper tubes 15a and 15b are prevented from falling off from the end of the insulating member 19. A metal tape 49 is wound around the outer peripheral surface of the connection portion between the copper tubes 15a and 15b and the insulating member 19 in the circumferential direction. That is, the metal tape 49 is wound so as to cover the pins 47, the holes 45a and 45b, and the boundaries between the copper tubes 15a and 15b and the insulating member 19 (excluding the grooves 18a and 18b).

  The metal tape 49 can prevent the pins 47 from falling out of the holes 45a, 45b and the like. Further, the metal tape 49 ensures the waterproofness of the connection portion between the copper tubes 15 a and 15 b and the insulating member 19.

  That is, in the connection structure 1 of the present invention, the insulating member 19 and the copper pipes 15a and 15b are O-rings arranged on the opposing surfaces of the flange portion as used in the conventional connection structure shown in FIG. Rather than waterproofing, etc., the metal tape 49 is wound over the insulating member 19 and the copper tube 15a, the metal tape 49 is wound over the insulating member 19 and the copper tube 15b, and the gap between these connecting portions is covered. ing. For example, an aluminum adhesive tape can be used as the metal tape 49.

  Next, as shown in FIG. 6, the resin-impregnated tape 51 is wound around the outer periphery of each connecting portion. The resin impregnated tape 51 is wound so as to completely cover the metal tape 49 and cover the grooves 18a and 18b. As the resin-impregnated tape 51, for example, a glass fiber tape impregnated with an epoxy resin can be used. By winding the resin-impregnated tape 51, the mechanical strength of the connecting portions 41a and 41b can be ensured, and waterproofing can be obtained more reliably.

  Further, by winding the resin impregnated tape 51, the resin flows into the grooves 18a and 18b. Thereafter, the resin is cured, so that the resin-impregnated tape 51 is completely covered and fixed to the connection portions 41a and 41b between the copper tubes 15a and 15b and the insulating member 19. At this time, since a part of the resin flows into the grooves 18a and 18b and hardens, the resin-impregnated tape 51 is not displaced from the joint portion, and the vicinity of the connection portions 41a and 41b is surely covered to be reinforced and waterproofed. be able to.

  As described above, according to the present invention, the copper tube 15 a and the copper tube 15 b can be reliably insulated by the insulating member 19. Further, the copper tubes 15a and 15b are respectively fitted in both ends of the insulating member 19 in the axial direction and joined by pins 47 from the outer peripheral side which is a direction (radial direction) perpendicular to the axial direction. For this reason, an outer diameter can be made small compared with the case where a copper pipe and an insulating member are joined by a flange part like the past. Moreover, it is easy to secure a working space for joining work as compared with joining at the flange portion, and the workability is excellent.

  Moreover, the connection part with the copper pipe 15b of the insulating member 19 is diameter-reduced with respect to the connection part with the copper pipe 15a. For this reason, a space can be secured on the outer periphery of the copper tube 15b (the reduced diameter portion 20b of the copper tube 15b). Therefore, the outer conductor 25 and the inner conductor 27 of the coaxial cable 23, the terminal portion 21, and the terminal 28 can be disposed in this space. For this reason, it is not necessary to arrange | position a terminal member etc. in the outer periphery of the copper pipe 15a with a large outer diameter (or the enlarged diameter part 20a of the insulating member 19). Therefore, the connection portion does not increase in size, and the entire connection structure can be reduced in size.

  Further, when connecting the copper tubes 15a, 15b and the insulating member 19, no bolting or the like is required. For this reason, it is excellent in workability for constructing the connection structure 1, and it is not necessary to embed a thimble for screwing a bolt into the insulating member or to perform tapping or the like. In addition, since the metal tape 49 and the resin-impregnated tape 51 are waterproofed at the connection portions 41a and 41b between the copper tubes 15a and 15b and the insulating member 19, an O-ring or the like is not necessary. No groove is required. Therefore, it is not necessary to increase the thickness of the insulating member 19 due to the O-ring groove.

  Further, grooves 18 a and 18 b are formed on the outer peripheral surface of the insulating member 19. For this reason, the resin impregnated into the groove is hardened, and the resin-impregnated tape 51 wound around the outer peripheral surface can be reliably fixed to the insulating member 19. Note that the depth of the grooves 18a and 18b may be fixed by allowing the resin to flow into the interior, so that the above-described effects can be obtained even with a shallower groove than the conventional O-ring groove. Therefore, the thickness of the insulating member 19 is not excessively increased.

  Further, in the connection structure of the present invention, the outer conductor 25, the inner conductor 27, the terminal portion 21, and the terminal 28 are connected to each connection portion (that is, the copper tube 15b or the reduced diameter portion 20b of the insulating member 19). Since the resin pipe 30 is arranged and the outer shape of the part is adjusted, it is possible to prevent a severe uneven shape from being formed in the part.

  Therefore, when the waterproof tube provided in the outer peripheral part of the said part deform | transforms with a heat change or external force, it can prevent that a clearance gap is formed in the edge part etc. of a waterproof tube. Therefore, waterproofness can be secured more effectively.

  Moreover, since the resin pipe 30 is divided | segmented into plurality in the circumferential direction, it is easy to arrange | position to the outer peripheral part of a connection part. Further, by forming a notch in a part of the resin pipe 30, interference between the resin pipe 30 and the terminal 28, the terminal portion 21 (and the external conductor 25 and the internal conductor 27 connected thereto) and the like is prevented. be able to. Therefore, it is not necessary to increase the outer diameter of the resin pipe 30 excessively.

  In addition, the outer diameter of the resin pipe 30 can be made into an outer diameter substantially equivalent to the outer diameter of the copper pipe 15a, for example. By doing so, the maximum diameter of the entire connection structure is not increased.

  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.

  For example, the shape of each member or the like constituting the connection structure 1 is not limited to the illustrated example. Moreover, in order to ensure waterproofness and insulation, a waterproof tape, an insulating tape, etc., which are not shown, may be provided as appropriate.

DESCRIPTION OF SYMBOLS 1 ......... Connection structure 3a, 3b ......... Wire 5 ......... Conductor part 6 ......... Conductor connection part 7 ......... Insulation part 9 ......... Semi-conductive part 11 ......... Aluminum corrugated tube 13 ... ... External sheaths 15a, 15b ......... Copper tubes 18a, 18b ......... Groove 19 ......... Insulating member 20a ......... Expanded diameter part 20b ......... Reduced diameter part 21 ......... Terminal part 23 ......... Coaxial cable 25 ......... External conductor 26 ......... Plain braid 27 ......... Internal conductor 28 ......... Terminal 30 ......... Resin pipe 31 ......... Lid 32 ......... Protective covers 35a, 35b ......... Metal shielding layer 37 ......... Rubber member 38 ......... Notches 41a, 41b ......... Connectors 43a, 43b ......... Hole 45a, 45b ......... Hole 47 ......... Pin 49 ......... Metal tape 51 ......... Resin-impregnated tape 100... Connection structure 103 a, 103 b... Electric wire 105. ......... Conductor connection 107 ......... Insulating part 109 ......... Semiconductive part 111 ......... Aluminum corrugated pipe 113 ......... Outer sheath 115a, 115b ......... Copper pipe 117a, 117b ......... Flange part 119 Insulating members 121a, 121b ... Terminal section 123 ... Coaxial cable 125 ... Outer conductor 127 ... Inner conductor 129 ... Coffin box 131, 133 ... Lids 135a, 135b ... Metal shielding layer 137 ... Rubber member

Claims (6)

Power cable connection structure,
A first metal tube in conduction with the shielding layer of the power cable on one side;
A second metal tube in conduction with the shielding layer of the power cable on the other side;
A first lead wire conducting to the first metal tube;
A second lead wire conducting with the second metal tube;
A cylindrical insulating member disposed between the first metal tube and the second metal tube;
Comprising
The first metal pipe covers a connection portion between the power cables, and is connected to the second metal pipe via the insulating member around the power cable on the other side,
The connecting portion of the insulating member with the second metal tube is a reduced diameter portion whose diameter is smaller than the outer diameter of the connecting portion of the insulating member with the first metal tube,
An end portion of the first metal tube and the second metal tube is fitted and connected in the axial direction of each end of the insulating member. The first lead wire is connected to the first metal pipe via a conductor;
The connecting portion between the first lead wire and the conducting wire and the connecting portion between the second lead wire and the second metal tube are the reduced diameter portion or the second metal tube of the insulating member. The power cable connection structure according to claim 1, wherein the power cable connection structure is disposed on an outer periphery of the power cable. A substantially cylindrical protective member is disposed on the outer periphery of the connection portion between the first lead wire and the conducting wire and the connection portion between the second lead wire and the second metal tube,
The power cable connection structure according to claim 2, wherein at least a part of the first metal tube and the protective member are covered with a waterproof tube. Holes are formed in corresponding portions at both ends of the insulating member, and at the ends of the first metal tube and the second metal tube connected to the insulating member,
A groove is formed in the circumferential direction on the outer peripheral surface in the vicinity of the hole of the insulating member,
With the insulating member, the first metal tube and the second metal tube being fitted, a connection member is inserted into the hole,
A resin-impregnated tape is wound so as to cover the connecting member and the groove, and end portions of the first metal tube and the second metal tube are respectively connected to both end portions of the insulating member. The power cable connection structure according to any one of claims 1 to 3, wherein:   The power cable connection structure according to claim 4, wherein a metal tape is further provided so as to cover the connection member, and the resin-impregnated tape is wound around an outer periphery of the metal tape. An insulating member used in a power cable connection structure,
The insulating member has connection portions with metal pipes at both ends,
The connecting portion at one end is reduced in diameter relative to the connecting portion at the other end,
A hole is provided in each of the connecting portions at both ends of the insulating member, and an outer circumferential surface of the insulating member is formed with a groove in the circumferential direction in the vicinity of the hole.

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