JP7431658B2 - Cable connection - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to cable connections.

Conventionally, as cable connections, end connections such as a gas end connection, an oil end connection, and an air end connection, and intermediate connections such as a straight connection and a branch connection are known. Generally, at the cable connection part, for example, a connection terminal is compressively connected to the cable conductor and electrically connected to the internal conductor of the main body material.

By the way, the stress generated during manufacturing remains in the cable insulator, so when the power cable is cut, the residual stress is released and the cable insulator contracts. This phenomenon is called shrinkback. Shrinkback is further increased by heat cycles caused by energization. When the position of the cable insulator changes due to shrinkback, the contact position between the cable's outer semiconducting layer end and the stress cone (semiconducting rubber part) shifts, and depending on the degree of shift, insulation performance is affected. This may eventually lead to dielectric breakdown. Therefore, in conventional cable connection sections, as a measure against shrinkback, the positional fluctuation of the cable insulator is suppressed by mechanically gripping the cable insulator (see, for example, Patent Documents 1 and 2).

Patent Document 1 discloses that a male terminal connected to the tip of a cable conductor of a power cable and a cable insulator are connected using a retaining jig. Specifically, a notch groove is formed in the male terminal and the cable insulator, and the male terminal and the cable insulator are connected by fitting the inner peripheral protrusions provided at both ends of the retaining jig into the notch groove. has been done.

Patent Document 2 discloses that the cable insulators of two power cables to be connected are connected to each other by an insulating layer connection part at a cable intermediate connection part. Specifically, the cable insulators are connected to each other by forming a notch groove in each cable insulator, and fitting the protrusion structures at both ends of the insulating layer connecting portion into the notch groove.

Japanese Patent Application Publication No. 11-266521 Patent No. 6280460

By the way, in the configurations disclosed in Patent Documents 1 and 2, the protruding portion of the retaining member (retaining jig, insulating layer connecting portion) is fitted into a notch groove formed in advance in the cable insulator and the male terminal, or in the cable insulators. The structure is such that the protruding portion of the retaining member and the notch groove need to be aligned. However, when the male terminal (or conductor connecting tube) is compressed and connected to the cable conductor, the position of the tip of the cable insulator is unstable due to variations in the compression and elongation of the cable conductor and the conductor connection part, and the size of the retaining member does not allow for the notch groove. There was a possibility that the position could not be adjusted, and as a result, the retaining member could not be fitted into the notch groove.

An object of the present invention is to provide a cable connection part to which a restraining member can be attached without being affected by variations in compressive elongation of the cable conductor and the conductor connection part.

The cable connection part according to the present invention includes:
A cable connection part in which a cable conductor and a cable insulator are connected to a cable terminal part exposed from the tip side,
a conductor connection portion that is compressively connected to the cable conductor at a compression connection portion;
a retaining part that connects the cable insulator and the conductor connection part to restrict movement of the cable insulator with respect to the conductor connection part;
Equipped with
The retaining part is
The conductor connection part is arranged so as to straddle the cable insulator from the outer periphery of the end on the rear end side of the compression connection part , and the first end in the longitudinal direction is connected to either the conductor connection part or the cable insulator. a retaining member engaged with one of the two;
a fixing member that anchors and fixes the second end of the anchoring member in the longitudinal direction to either the outer periphery of the end of the conductor connection portion or the cable insulator;
has.

According to the present invention, the retaining member can be attached without being affected by variations in compressive elongation of the cable conductor and the conductor connection portion.

FIG. 1 is a half-sectional view showing the overall configuration of the cable connection section according to the first embodiment of the present invention. FIG. 2 is an enlarged view of the vicinity of the conductor connection portion in FIG. 1. FIG. It is a sectional view of a conductor connection part. It is a perspective view of a retaining member. 5 is a sectional view of the retaining member taken at an arbitrary position in the vertical direction shown in FIG. 4. FIG. 6 is a view taken along the line AA in FIG. 5. FIG. FIG. 3 is an enlarged view of a contact portion between a fixing member and an uneven outer circumferential surface. FIG. 7 is a sectional view of a retaining member according to a modified example. FIG. 3 is an enlarged view of a contact portion between a fixing member and a dimple. It is a half sectional view showing the whole structure of the cable connection part concerning the 2nd embodiment of the present invention.

[First embodiment]
Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a half-sectional view showing the overall configuration of a cable connection section 1 according to an embodiment of the present invention. FIG. 2 is an enlarged view of the vicinity of the conductor connection portion in FIG. 1. The cable connection section 1 shown in FIGS. 1 and 2 is an example of an intermediate connection section that connects cable terminal sections. Further, in FIGS. 1 and 2, the conductor connection portion side is referred to as the "tip" and the power cable side is referred to as the "rear end."

As shown in FIG. 1, the cable connection section 1 includes a terminal section of a first power cable 11, a terminal section of a second power cable 12, a conductor connection section 20, a reinforcing insulation section 30, a protective case 40, etc. . Here, the cable connection 1 is a cable intermediate connection. In the following, when the first power cable 11 and the second power cable 12 are not distinguished, they are simply referred to as "power cables 11, 12."

The power cables 11 and 12 include, in order from the inside, cable conductors 111 and 121, an inner semiconducting layer (not shown), cable insulators 112 and 122, cable outer semiconducting layers 113 and 123, cable shielding layers 114 and 124, and It has cable sheaths 115, 125, etc. By stripping the terminal parts of the power cables 11 and 12 at predetermined lengths, each layer (cable conductors 111, 121, cable insulators 112, 122, cable external semiconductive layers 113, 123, and The cable shielding layers 114, 124) are exposed.

In this embodiment, the conductor connection section 20 is a conductor connection tube that electrically and mechanically connects the cable conductor 111 of the first power cable 11 and the cable conductor 121 of the second power cable 12. The conductor connection portion 20 is formed of a conductive material suitable for conducting electricity, such as copper, aluminum, copper alloy, or aluminum alloy.

FIG. 3 shows the configuration of the conductor connection section 20. The conductor connection part 20 is configured in a cylindrical shape and includes a current-carrying part 21 and a compression connection part 22.

The current-carrying portion 21 is provided at the center of the conductor connecting portion 20 in the axial direction.

The compression connection portions 22 are provided on both sides of the current-carrying portion 21 in the axial direction. The compression connection portion 22 is provided with a first concave portion 22B on the front end side (on the current-carrying portion 21 side) and a second concave portion 22C on the rear end side (on the end portion 20A side). The compression connection portion 22 is connected to the current-carrying portion 21 via the first recess 22B, and is connected to the end portion 20A having a smaller diameter than the compression connection portion 22 via the second recess 22C. The compression connection part 22 and the end part 20A of the conductor connection part 20 have a cable insertion part 22A which is open on the end part 20A side and communicates with each hole formed in the axial direction, and is formed in a bottomed cylindrical shape. . The tip portions of the cable conductors 111 and 121 are inserted into each cable insertion portion 22A and are compressed and connected. The first concave portion 22B and the second concave portion 22C can absorb elongation and deformation of the conductor connection portion 20 when the conductor connection portion 20 is compressively connected to the cable conductors 111 and 121. Specifically, the first recessed portion 22B can prevent deformation of the current-carrying portion 21 during compression connection, and the second recessed portion 22C can prevent deformation of the end portion 20A during compression connection.

Further, the conductor connecting portion 20 is connected to the cable insulators 112 and 122 by a retaining portion 60 (see FIG. 1). Detention portion 60 prevents shrinkback of cable insulators 112, 122. The shrink-back prevention structure including the cable insulators 112, 122, the conductor connection portion 20, and the retaining portion 60 will be described later.

Returning to FIG. 1, the reinforcing insulating section 30 is arranged so as to surround the outside of the cable conductors 111, 121 of the power cables 11, 12 and the conductor connection section 20. In this embodiment, the reinforcing insulating section 30 is a one-piece rubber block insulator in which a rubber insulating section 31, an internal electrode 32, stress cone sections 33, 34, and an external shielding layer 35 are integrally molded. Such a cable connection is called a rubber block joint (RBJ) or the like. In the embodiment shown in FIG. 1, the reinforcing insulation section 30 has an uncut structure in which an external shielding layer 35 is connected to both stress cone sections 33,34. For example, silicone rubber or ethylene propylene rubber (EP rubber) is suitable for the rubber material forming the reinforcing insulating part 30. The reinforcing insulating part 30 is not limited to a structure without edge cutting, and may have a one-edge edge cutting structure in which the external shielding layer 35 is connected to either one of the stress cone parts 33 and 34, and the outer shielding layer 35 is connected to the stress cone part. It may be a structure in which edges are cut at both ends and not connected to either 33 or 34.

The internal electrode 32, the stress cone parts 33, 34, and the external shielding layer 35 (in the case of molding) are preferably formed of the same material for molding, such as semiconductive silicone rubber or semiconductive ethylene propylene rubber ( Semi-conductive EP rubber) is preferred. Further, it is preferable that the rubber insulating portion 31 is also formed of the same type of insulating material that does not have conductivity. The internal electrode 32 and the conductor connection part 20 are electrically connected by wrapping a semiconducting tape (not shown) around the outer periphery of the conductor connection part 20 and bringing the semiconducting tape and the internal electrode 32 into contact. Alternatively, the internal electrode 32 and the conductor connecting portion 20 may be configured to be in direct contact with each other to electrically connect.

The reinforcing insulating part 30 is held in a state in which the diameter is expanded by a diameter expanding member such as a spiral core (also called an inner core) at a factory, for example. After the reinforcing insulating part 30 is placed so as to surround the terminal parts and the conductor connection part 20 of the power cables 11 and 12 at the construction site, the conductor connection is made by pulling out the expanded diameter member and using the self-contracting force of the rubber. It is attached in close contact with the section 20. Thereby, the insulation performance at the cable connection part (here, the straight connection part) 1 is ensured. Note that the reinforcing insulating part 30 is not limited to a so-called factory expanded diameter type such as a spiral core, but may be a so-called on-site diameter expanded type in which the diameter is expanded at the construction site using a diameter expanding jig or a diameter expanding device. Furthermore, the reinforcing insulating part 30 may be of a plug-in type in which the terminal parts of the power cables 11 and 12 and the conductor connecting part 20 are press-fitted into the reinforcing insulating part 30. In this case, the cable conductor 111 and the cable conductor 121 are connected by a conductor connection terminal (conductor connection part) on each of the cable conductors 111 and 121, instead of using one conductor connection pipe (conductor connection part 20) as in this embodiment. It has a configuration in which the two are compressed and connected, and the connection is made within the reinforcing insulating part 30 via a conductor contact or the like.

The protective case 40 is arranged to surround the terminal portions of the power cables 11 and 12 and the reinforcing insulating portion 30. The protective case 40 is formed of, for example, a copper tube, and a PVC layer (not shown), for example, is provided integrally with the copper tube on its outer periphery for corrosion protection. The protective case 40 is attached to the cable sheaths 115, 125 of the power cables 11, 12 by forming an anti-corrosion layer 50 by wrapping tape, for example, so as to span the ends of the copper pipes, specifically, the ends of the PVC layer. Fixed. Further, a waterproof compound (code omitted; for example, a waterproof compound such as urethane) is filled between the reinforcing insulating part 30 and the protective case 40. The protective case 40 and the waterproof mixture ensure the water-blocking properties of the cable connection portion 1.

The cable shielding layers 114, 124 of the power cables 11, 12 are here formed of wire shields. A plurality of wire shields are crimped together with one end of the braided wire 117 using a crimping sleeve 118, and the other end of the braided wire 117 is soldered to the protective case 40. Thereby, the cable shielding layers 114 and 124 are electrically connected to the protective case 40 and grounded. Note that the cable shielding layers 114 and 124 may be formed of copper tape, lead sheathing, or aluminum sheathing instead of wire shielding.

Next, a shrink-back prevention structure in the cable connection portion 1 will be explained.

As shown in FIG. 2, the cable connection section 1 according to the present embodiment is provided with a retaining section 60 as a structure for preventing shrinkage of the cable insulators 112 and 122. The retaining portion 60 connects the cable insulators 112, 122 and the conductor connection portion 20, and restricts movement of the cable insulators 112, 122 with respect to the conductor connection portion 20. The retaining portion 60 includes a retaining member 61 and a fixing member 70. The conductor connection portion 20 is connected to the tip portions 116, 126 of the cable insulators 112, 122 via the detent portion 60, as described above.

The tip portions 116, 126 of the cable insulators 112, 122 according to this embodiment are cut to have a smaller diameter than the portion on the rear end side. Annular protrusions 116A and 126A that engage with the retaining member 61 are formed on the outer circumferential surfaces of the distal ends 116 and 126 on the distal side. The annular protrusions 116A, 126A protrude radially outward from the outer peripheral surfaces of the distal ends 116, 126 on the distal side. Grooves 116B, 126B are formed between the annular protrusions 116A, 126A and the rear end portions of the cable insulators 112, 122, that is, on the rear end sides of the tip portions 116, 126.

Further, as shown in FIG. 3, the end 20A of the conductor connection part 20, in other words, the rear end side that is connected to the compression connection part 22 via the second recessed part 22C is larger than the outer diameter of other parts. It is also formed small. The end portion 20A of the conductor connection portion 20 has an uneven outer circumferential surface 23 having an uneven shape on its outer circumferential surface. The uneven outer circumferential surface 23 has, for example, a male screw shape.

The fixing member 70 (see FIG. 2) is a screw member having a male thread shape, such as a set screw with a hexagonal socket, for example. It is fixedly fixed to the conductor connection part 20.

As shown in FIG. 2, the retaining member 61 is arranged so as to extend from the conductor connection portion 20 to the cable insulators 112 and 122. In the retaining member 61, the end that engages with the tip ends of the cable insulators 112 and 122 is referred to as a "first end", and the end disposed on the uneven outer circumferential surface 23 is referred to as a "second end".

Further, as shown in FIG. 5, the retaining member 61 is configured into a cylindrical shape as shown in FIG. be done. It is configured. Such a restraining member has a configuration similar to that of a member called a connection conductor, a coupling conductor, or the like. A bolt insertion hole 61E is formed in the side surfaces facing each other when the two semi-cylindrical parts 611 and 612 are combined. The bolt insertion holes 61E are formed on the left and right side surfaces shown in FIG. 5, respectively.

Furthermore, a bolt placement portion 61F for inserting a bolt into the bolt insertion hole 61E is formed at a position corresponding to the bolt insertion hole 61E on the outer peripheral surface of the lower semicylindrical portion 612 in FIG. The bolt placement portion 61F is formed to be recessed from the outer peripheral surface of the semi-cylindrical portion 612.

These semi-cylindrical parts 611 and 612 are combined with each other with the second inner peripheral surface 61C being engaged with the cable insulators 112 and 122.

Once the semi-cylindrical parts 611 and 612 are combined with each other, the semi-cylindrical parts 611 and 612 are fastened together and function as the retaining member 61 by inserting a bolt from the bolt placement part 61F into each bolt insertion hole 61E.

The retaining member 61 is formed with a through hole 61A that penetrates from the outer circumferential surface to the inner circumferential surface. The through hole 61A is located at a location corresponding to the uneven outer circumferential surface 23 of the conductor connection portion 20 described above. The through hole 61A has a female thread shape through which the fixing member 70 is passed. For example, four through holes 61A are formed on the same circumference around the retaining member 61.

FIG. 6 is a view taken along the line AA in FIG. 5 (however, the bolt insertion hole 61E is not shown). As shown in FIG. 6, the first end portion of the retaining member 61 is configured in a step shape to correspond to the shape of the cable insulators 112, 122 (tip portions). The inner circumference (specifically, the first inner circumferential surface 61B) of the second end of the retaining member 61 is configured to correspond to the outer circumference (the uneven outer circumferential surface 23) of the conductor connection portion 20. The retaining member 61 has a first inner circumferential surface 61B, a second inner circumferential surface 61C, and a third inner circumferential surface 61D.

The first inner circumferential surface 61B is an inner circumferential surface that faces the uneven outer circumferential surface 23 of the conductor connection portion 20 described above. By passing the fixing member 70 through the above-described through hole 61A and fastening it, the retaining member 61 is retained and fixed to the conductor connecting portion 20.

The second inner circumferential surface 61C is an inner circumferential surface facing the annular projections 116A, 126A of the cable insulators 112, 122, and has an inner diameter larger than the first inner circumferential surface 61B.

The third inner circumferential surface 61D is an inner circumferential surface located on the opposite side of the first inner circumferential surface 61B with respect to the second inner circumferential surface 61C. The third inner circumferential surface 61D is provided on the first end side of the retaining member 61. The third inner circumferential surface 61D has an inner diameter larger than the first inner circumferential surface 61B and smaller than the second inner circumferential surface 61C.

With this configuration, a groove is formed in the inner circumferential surface of the retaining member 61 at the second inner circumferential surface 61C. The annular protrusions 116A, 126A of the cable insulators 112, 122 engage in this groove (see also FIG. 2). In other words, the groove portion that is the longitudinal end portion of the retaining member 61 and the cable insulators 112 and 122 have an uneven structure that engages with each other.

Note that the inner diameter of each inner circumferential surface may be changed as appropriate depending on the members facing each other. Furthermore, when the outer diameter of the portions other than the annular protrusions 116A and 126A of the tip portions 116 and 126 of the cable insulators 112 and 122, that is, the grooves 116B and 126B is made smaller, the third inner circumferential surface 61D of the retaining member 61 is made smaller. Some parts can be made to protrude more than others. By doing so, the engagement force between the retaining member 61 and the cable insulators 112 and 122 can be strengthened.

As shown in FIG. 7, the fixing member 70 is passed through the through hole 61A of the combined retaining member 61. The tip of the fixing member 70 contacts the uneven outer peripheral surface 23, which is the outer peripheral surface of the conductor connecting portion 20, through the through hole 61A. Specifically, the tip of the fixing member 70 fits into any one of a plurality of recesses (here, male screw-shaped recesses) of the uneven outer circumferential surface 23 . As a result, the retaining member 61 connects the conductor connecting portion 20 and the cable insulators 112 and 122, and is retained and fixed to the conductor connecting portion 20.

By the way, for example, in a configuration in which the conductor connecting portion and the retaining member are engaged with each other and fixed, it is necessary to match the dimensions of the portion where the retaining member and the conductor connecting portion are engaged. However, due to variations in the compression and elongation of the cable conductor and the conductor connection portion when the cable conductor is compressed and connected, the dimensions may change, and there is a possibility that the retaining member and the conductor connection portion cannot be engaged and fixed.

In this embodiment, the retaining member 61 is retained and fixed to the conductor connecting portion 20 by the tip of the fixing member 70 coming into contact with the uneven outer circumferential surface 23, so that the compression and elongation of the cable conductors 111, 121 and the conductor connecting portion 20 is prevented. The retaining member 61 can be attached to the conductor connection portion 20 without being affected by variations.

Further, since the conductor connecting portion 20 is fixed with a restraint while the retaining member 61 is engaged with the cable insulators 112 and 122, the occurrence of shrinkback of the cable insulators 112 and 122 can be suppressed.

Moreover, since the uneven outer circumferential surface 23 has an uneven shape, the tip of the fixing member 70 fits into any of the recesses. Thereby, the fixing member 70 is fixed to the uneven outer circumferential surface 23, so that the retaining force by the retaining portion 60 can be improved.

In addition, for example, if the retaining member and the conductor connecting portion are fixed by providing a screw hole in the conductor connecting portion and fixing a set screw in the screw hole, the first end of the retaining member may be aligned with the cable insulator. Sometimes, the position of the through hole of the retaining member and the position of the screw hole do not match. In contrast, in the present embodiment, the retaining member 61 can be retained and fixed to the conductor connecting portion 20 simply by fitting the tip of the fixing member 70 into any of the plurality of recesses on the uneven outer circumferential surface 23. As a result, compared to a configuration in which a screw hole through which a set screw is inserted is provided in the conductor connection part, the flexibility of the fixing position of the retaining member 61 is improved due to the simple configuration, and the retaining member 61 can be securely fixed. Can be done. Moreover, since the fixing member 70 can be a general-purpose item such as a hexagon socket set screw, the retaining part 60 can be formed at low cost.

Further, by providing two bolt arrangement portions 61F on one of the two retaining members 61, the two retaining members 61 can be assembled from the same direction, so that the efficiency of the assembly work can be improved.

Further, since the retaining member 61 is configured in a cylindrical shape, it can be attached so as to surround the entire periphery of the cable insulators 112 and 122 and the conductor connecting portion 20. As a result, the cable insulators 112, 122 and the conductor connecting portion 20 can be firmly connected by the retaining member 61.

Further, since the through hole 61A has a female thread shape, the retaining member 61 can be stably fixed easily by screwing the fixing member 70 having a male thread shape.

Note that in the above embodiment, the retaining member 61 has a concave portion and the cable insulators 112 and 122 have convex portions to form a concavo-convex structure, but the present invention is not limited to this. For example, a configuration may be adopted in which the retaining member 61 has a convex portion and the cable insulators 112 and 122 have concave portions.

Even with such a configuration, the retaining portion 60 can be attached to the conductor connection portion 20 without being affected by variations in compression and elongation of the cable conductor and the conductor connection portion.

Furthermore, in the embodiment described above, only one of the two semi-cylindrical portions 611 and 612 (the lower semi-cylindrical portion 612 in FIG. 5) is provided with two bolt arrangement portions 61F; The invention is not limited to this. For example, as shown in FIG. 8, one bolt arrangement part 62F may be provided in each of the two semi-cylindrical parts 621 and 622.

In such a configuration, the retaining member 62 is configured such that the respective bolt placement portions 62F are arranged symmetrically. Each bolt arrangement portion 62F is provided with a bolt insertion hole 62E, similar to the bolt insertion hole 61E of the retaining member 61 shown in FIG. The retaining member 62 shown in FIG. 8 has a structure other than the arrangement of the bolt placement part 62F, that is, the through hole 62A, the first inner circumferential surface 62B, the second inner circumferential surface 62C, and the third inner circumferential surface 62D. This is similar to the through hole 61A, first inner circumferential surface 61B, second inner circumferential surface 61C, and third inner circumferential surface 61D of the retaining member 61 shown.

Even with such a configuration, the retaining portion 60 can be attached to the conductor connection portion 20 without being affected by variations in compression and elongation of the cable conductor and the conductor connection portion. However, the configuration shown in FIG. 5 in which the bolt arrangement portions 61F are on the same side is preferable to the configuration shown in FIG. 8 from the viewpoint of workability during assembly work.

Moreover, with this configuration, each of the retaining members 61 can be made to have the same shape, so that the retaining members 61 can be manufactured easily.

[Second embodiment]
FIG. 10 is a half-sectional view showing the overall configuration of a cable connection section according to a second embodiment of the present invention. Note that elements that are the same as or correspond to those in the first embodiment are given the same reference numerals, and redundant explanations will be omitted.

As shown in FIG. 10, the cable connection section 2 includes a terminal section of the first power cable 11, a terminal section of the second power cable 12, a conductor connection section 20, an insulation unit 80, a protective case 85, and the like. The cable connection portion 2 is a prefabricated intermediate cable connection portion into which the terminal portions of the power cables 11 and 12 are inserted from both sides of the insulation unit 80 and the cable conductors 111 and 121 are connected to each other. The cable intermediate connection is also called a pre-molded cable intermediate connection, a prefabricated joint, a cable straight connection, etc.

As shown in FIG. 10, the insulation unit 80 includes an inner conductor 82 that is electrically connected to the cable conductors 111 and 121, a main insulation part 81 that surrounds the outer peripheral surface of the inner conductor 82, and an outer periphery of the main insulation part 81. A shielding layer (not shown) is provided on the surface. The internal conductor 82 is made of a metal material, and the main insulating part 81 is made of a hard insulator such as epoxy resin. The shielding layer is formed, for example, by applying conductive paint to the outer peripheral surface of the main insulating section 81. The internal conductor 82 and the main insulating portion 81 are integrally formed, for example, by molding so that a portion of the internal conductor 82 is exposed from the inner peripheral surface.

The insulation unit 80 has a hole that passes through the main insulation part 81 and the internal conductor 82 in the axial direction, and the cable end portion is inserted into this hole.

The insulation unit 80 is arranged so as to surround the outside of the cable conductors 111 and 121 of the power cables 11 and 12 and the conductor connection part 20. The conductor connecting portion 20 and the internal conductor 82 can be electrically and mechanically connected by the sleeve fixing member 24 . The connection between the conductor connecting portion 20 and the retaining portion 60 is the same as in the first embodiment, and therefore the description thereof will be omitted.

Further, inside the insulating unit 80, a stopper 84, a stress cone (pre-molded insulator) 83, a stress cone compression device (not shown), etc. are arranged from the tip side.

The stress cone (pre-molded insulator) 83 consists of an insulating rubber part 83A on the tip side and a semiconductive rubber part 83B connected to the rear end side of the insulating rubber part 83A. The rubber material forming the stress cone (pre-molded insulator) 83 is preferably ethylene propylene rubber (EP rubber) or silicone rubber.

The protective case 85 is arranged to surround the terminal portions of the power cables 11 and 12 and the insulation unit 80. The protective case 85 is made of, for example, a copper tube.

As shown in FIG. 10, also in the cable connection part 2, the retaining member 61 connects the conductor connection part 20 and the cable insulators 112, 122, and is fixed to the conductor connection part 20, so that the The same effects as the cable connection section 1 of the first embodiment can be obtained.

In the embodiment described above, the uneven outer circumferential surface 23 of the conductor connection portion 20 is formed in a male screw shape, but the present invention is not limited to this. For example, the uneven outer circumferential surface 23 of the conductor connecting portion 20 facing the retaining member 61 may be formed by knurling, dimples, roughening, or the like. For example, as shown in FIG. 9, when the conductor connecting portion 20 has a plurality of dimples 25, the tip of the fixing member 70 fits into one of the dimples 25. Thereby, the retaining force of the retaining member 61 can be improved. Moreover, when the outer peripheral surface generates sufficient frictional force by contacting with the fixing member 70, it is not necessary to have an uneven shape.

Further, in the above embodiment, the retaining member 61 is fixed by screwing the fixing member 70 having a male thread shape into the through hole 61A having a female thread shape, but the present invention is limited to this. However, as long as the retaining member 61 can be firmly fixed to the conductor connection part 20, a structure in which it is fixed with a member other than a screw member (a structure in which it is fixed by means other than screwing) may be used.

Further, in the above embodiment, two through holes 61A are provided in each of the semi-cylindrical portions 611 and 612 of the retaining member 61 (total of four in the retaining member 61), but the present invention is limited to this. The retaining member 61 may be provided with any number of retaining members. However, from the viewpoint of stabilizing the restraint fixation by the restraint member 61, it is preferable that two or more members are provided.

Further, in the above embodiment, the retaining member 61 is composed of two members (semi-cylindrical parts 611 and 612), but the present invention is not limited to this, and may be composed of three or more members. Good too.

Furthermore, in the above embodiment, the retaining member 61 engages with the cable insulators 112 and 122 and is secured to the conductor connecting portion 20, but the present invention is not limited thereto. For example, a detent member may engage the conductor connection and be detented to the cable insulators 112, 122.

Further, in the above embodiment, the application is applied to the intermediate connection part that connects the first power cable 11 and the second power cable 12, but the present invention is not limited thereto, and can be applied to the terminal connection part. You can leave it there. In this case, the conductor connection portion is formed by one conductor connection terminal.

In addition, the above-mentioned embodiments are merely examples of implementation of the present invention, and the technical scope of the present invention should not be construed as limited by these. That is, the present invention can be implemented in various forms without departing from its gist or main features.

1 Cable connection part 11, 12 Power cable 111, 121 Cable conductor 112, 122 Cable insulator 113, 123 External semiconducting layer 114, 124 Cable shielding layer 115, 125 Cable sheath 117 Braided wire 118 Crimp sleeve 20 Conductor connection part 20A End Part 21 Current-carrying part 22 Compression connection part 22A Cable insertion part 22B First recessed part 22C Second recessed part 23 Uneven outer peripheral surface 30 Reinforcement insulation part 31 Rubber insulation part 32 Internal electrodes 33, 34 Stress cone part 35 External shielding layer 60 Retention part 61 Retaining member 61A Through hole 61B First inner circumferential surface 61C Second inner circumferential surface 61D Third inner circumferential surface 61E Bolt insertion hole 61F Bolt placement portion 70 Fixing member 2 Cable connection portion 80 Insulation unit 81 Main insulation portion 82 Internal conductor 83 Stress cone 83A Insulating rubber part 83B Semi-conductive rubber part 84 Stopper

Claims (9)

A cable connection part in which a cable conductor and a cable insulator are connected to a cable terminal part exposed from the tip side,
a conductor connection portion that is compressively connected to the cable conductor at a compression connection portion;
a retaining part that connects the cable insulator and the conductor connection part to restrict movement of the cable insulator with respect to the conductor connection part;
Equipped with
The retaining part is
The conductor connection part is arranged so as to straddle the cable insulator from the outer periphery of the end on the rear end side of the compression connection part , and the first end in the longitudinal direction is connected to either the conductor connection part or the cable insulator. a retaining member engaged with one of the two;
a fixing member that anchors and fixes the second end of the anchoring member in the longitudinal direction to either the outer periphery of the end of the conductor connection portion or the cable insulator;
has,
Cable connection. the first end is engaged with the cable insulation;
the second end portion is fixed to the conductor connection portion;
Cable connection according to claim 1. The retaining member has a cylindrical shape,
The cable connection part according to claim 1 or claim 2. The retaining member has a through hole formed at the second end at a position corresponding to the outer circumferential surface of the conductor connection part,
The fixing member retains and fixes the retaining member by contacting the outer circumferential surface of the conductor connection portion through the through hole.
The cable connection portion according to any one of claims 1 to 3. The through hole has a female thread shape,
The fixing member is a screw member having a male thread shape.
Cable connection according to claim 4. The conductor connection portion has an uneven shape on an outer circumferential surface of a portion corresponding to the second end portion.
The cable connection part according to claim 4 or claim 5. A plurality of the through holes are formed around the retaining member,
The cable connection portion according to any one of claims 4 to 6. The first end portion and the cable insulator have a concave-convex structure that engages with each other.
The cable connection section according to any one of claims 2 to 7. The retaining member is composed of a plurality of members,
The cable connection portion according to any one of claims 1 to 8.