JP5067750B2 - Cable-type terminal for outdoor use - Google Patents

Description

  The present invention relates to a cable-type outdoor terminal for a cable that can reliably connect an upper metal fitting having a connection terminal and a conductor at the end of a cable stripped off.

  In an electric wire line overlaid with a high-voltage cable (hereinafter simply referred to as a cable), for example, terminal processing is performed on a terminal portion of the cable at a connection place with an outdoor electric device. Since this terminal processing requires the same performance as the high-voltage cable at the cable termination, the outdoor terminal processing of the cable termination at the outdoors usually uses an irrigation pipe type terminal with an insulation pipe. is there. Particularly in areas where salt damage is significant, an outdoor insulator tube terminal having a porcelain insulator tube is used.

  FIG. 5 shows an example of a general high-voltage cable outdoor pipe terminal, in which a half of the terminal in the axial direction is shown in cross section. As shown in this figure, an outdoor insulator tube-type terminal 1 includes a cylindrical porcelain insulator tube 14 having a through-hole inside from the cable insertion port 14b toward the opening 14a at the tube axis direction tip, and the tip thereof. It has a structure in which a cable end 21 having a stress cone 15 attached thereto is inserted through the cable insertion port 14b and the stress cone 15 through the cable fitting port 14b. The upper metal fitting 10 includes a fixing portion 13c that is fixed to the tip of the insulator tube 14 in a watertight manner, and a terminal portion 10 that is integrally fixed to the fixing portion 13 and extends outward in the tube axis direction of the insulator tube 11. The terminal part 10 is comprised from the tubular member 10b which can accommodate the conductor 27 inside, and the connecting terminal 10a fixed to the front-end | tip. The stress cone 15 is fitted on the outer periphery of the end portion on the cable insertion port 14b side. A support fitting 16 is attached to the insulation pipe 14 near the cable insertion port 14b, and the outdoor salt-resistant terminal 1 is supported by a support (not shown) by the support fitting 16. An insulating compound 17 is filled between the inside of the through hole of the insulator tube 14 and the cable end.

In order to form such a terminal at the end of the cable by terminal processing, the cable end 21 is first stripped as shown in FIG. In this step stripping, the metal shielding tape layer 23, the outer semiconductive layer 25, the insulating layer 26, and the conductor 27 are sequentially exposed from the sheath of the cable end portion 21, and the tip of the conductor 27 is chamfered. After attaching the stress cone 15 to the cable end 21 thus stripped, the cable end 21 is inserted from the cable insertion port 14 b of the stub tube 14. When the cable end portion 21 is inserted for a predetermined length, the conductor 27 at the front end is usually accommodated in the tubular member 10b of the terminal portion 10, so that the outer periphery of the tubular member 10b is used with a predetermined compression tool (not shown). Thus, the conductor 27 and the terminal portion of the cable end portion 21 are connected. Thereafter, the lower end of the stress cone 15 is taped, the terminal formed in this way is fixed to a predetermined support by the support metal 16, and the grounding process is performed to complete the cable end process. As the tubular member of the terminal portion, compression connection and crimp connection are known, and FIG. 5 illustrates compression connection, but a tool used also in the case of a crimp connection terminal is used. An outdoor garment type tubular terminal is formed in the same procedure only by different.
JP-A-8-51717 JP-A-10-51936

  However, for example, the conductor at the end of the cable is formed by twisting strands made of soft copper wire that is thin and weak, and a phenomenon that individual strands can be unwound, that is, a so-called wari or conductor is easily bent. When the cable end is inserted from the insertion port of the insulation pipe, if the conductor at the end hits the tapered surface inside the insulation pipe and the conductor is bent or cracked, it is fixed to the tip of the insulation pipe integrally. In some cases, the conductor at the tip of the cable is not accommodated in the conductor accommodating chamber in the terminal portion, and the cable end cannot be inserted by a predetermined length from the insertion port of the scrub tube. In that case, the end of the cable must be extracted from the insulation pipe, the individual core wires that make up the conductor must be removed, and then soldered, and the tip must be filed and chamfered. It will be tough. In addition, if the cable end that has been soldered and chamfered at the tip of the conductor is inserted again from the insertion port of the scrub tube, if the chamfering is insufficient, it will enter the conductor housing of the upper bracket. As a result, it was possible that the end of the cable could not be inserted into the tube by a predetermined length.

  On the other hand, even when the cable end can be inserted into the insulation tube for a predetermined length, the conductor at the tip may be bent completely by hitting the tapered surface inside the insulation tube, and may not be accommodated in the conductor accommodation portion of the upper metal fitting. It was. In this case, if the continuity test is performed after the compression part of the upper metal fitting is compressed or crimped to the cable end using a predetermined compression tool, no continuity is observed, and the cable is removed from the potato tube. There was a possibility that it could be pulled out. In this way, when the connection failure between the conductor at the cable end and the terminal part occurs, this outdoor tubular terminal has already been compressed and deformed at the terminal part of the upper metal fitting, so it can be reused. After all, it had to be replaced with a new outdoor tubular terminal.

  The present invention has been completed to solve the above-mentioned problems, and the cable end conductor inserted into the outdoor salt-resistant terminal during the cable terminal processing work is accommodated in the conductor accommodating portion of the upper metal fitting. An object of the present invention is to provide an outdoor insulator terminal that can reliably connect a conductor to a terminal portion.

According to one aspect of the present invention, the object is to form a cylindrical insulator tube into which a cable end portion is stripped and the conductor is exposed at the tip end, and the tip end portion or the tip end portion is fixed in a watertight state. And a tubular member having a substantially C-shaped cross section having a notch along the length direction, and is detachably fixed to the fixing portion, and outwardly in the tube axis direction of the potato tube. A terminal part that accommodates the projecting conductor inside and can be connected to the terminal; and a watertight member that maintains a watertight state between the terminal part when the terminal part is fixed to the distal end portion of the insulator tube or the fixing part. This is achieved by an outdoor insulator tube terminal of a cable characterized by comprising.

In addition, according to another aspect of the present invention, the object is to provide a fixing portion that is fixed in a watertight manner to the tip portion of the garment tube, and a detachably fixed to the fixing portion so that the gait tube is outside the tube axis direction. A tubular member having a substantially C-shaped cross section having a notch along the length direction and accommodating a conductor exposed at the end of the cable stripped inside the tubular member And a watertight member that maintains a watertight state between the terminal part and the terminal part when the terminal part is fixed to the fixing part. The

  As long as the terminal portion can be detachably fixed to the distal end portion of the garment tube or the fixing portion, the fixing method is not particularly limited, and the terminal portion is detachably fixed using a method such as screwing, fitting, or engagement. can do. For example, when screwing, a threaded portion is formed at the distal end portion of the insulating tube or the outer peripheral surface of the fixing portion, and the terminal portion is engraved with a threaded portion on the inner peripheral surface at the end of the insulating tube side. The provided lock nut is provided so that it cannot be removed, and the terminal is removably fixed to the distal end of the insulator pipe via the fixing part by screwing the lock nut to the screw part of the insulator pipe or the fixing part. can do.

  Further, the watertight member is configured to prevent water from entering from the outside by maintaining a watertight state between the two when the terminal portion is fixed to the distal end portion or the fixing portion of the insulating tube. is there. As long as the watertight member has such a function, its form and properties are not limited. For example, it may be liquid or pasty, such as various conbounds having waterproof properties, or may be solid. In the latter solid state, various elastic bodies and plastic bodies having waterproof properties can be used, and molded articles such as packing may be used.

The terminal portion has a space for accommodating the conductor at the end of the cable therein, and is fixed to the conductor by compression or pressure bonding after the conductor is received. In the present invention, this internal space is formed by a tubular member having a substantially C-shaped cross section having a notch along the length direction. By forming the tubular member in such a shape, there is an advantage that the insertion state of the conductor can be confirmed through the notch when the terminal portion is fitted to the conductor at the cable end protruding from the tip of the garment tube. is there.

  Furthermore, the tubular member can be provided with at least one through-hole penetrating in and out of the tubular member. By providing at least one through hole in the tubular member in this way, when inserting the conductor at the cable end into the terminal part or connecting the conductor at the cable end and the terminal part, The insulating compound applied to the surface leaks, and it can be confirmed that the conductor at the end of the cable has been securely inserted into the terminal portion.

  As the insulator pipe in the outdoor insulator pipe type terminal of the present invention, any known ones such as those made of polymer resin or porcelain can be preferably used.

  In the case of the outdoor type tubular terminal of the present invention, the terminal portion is detachably fixed to the distal end portion of the insulating tube or the fixing portion fixed to the portion. It can be removed from the fixing part, and the cable terminal can be inserted into the garment tube, the conductor protrudes from the tip part, and then the terminal part can be covered and fixed to the fixing part. As a result, the conductor at the cable end can be reliably accommodated in the conductor accommodating space in the terminal portion, and the cable conductor and the terminal portion can be reliably connected. Further, at that time, since the watertight member is provided, even when the terminal portion is detachably fixed to the distal end portion or the fixing portion of the scoring tube, the watertight state can be maintained between these when fixing. it can.

  Hereinafter, with reference to FIGS. 1 to 4, an embodiment of an outdoor insulator type terminal of the present invention will be described in detail. FIG. 1 is a diagram showing an example of an embodiment of an outdoor salt-tolerant terminal according to the present invention, in which a half in the axial direction of the terminal is shown in cross section. FIG. 2 is an enlarged cross-sectional view of a portion surrounded by an ellipse in FIG. Since the basic configuration of the outdoor insulator tube type terminal 1 of the present invention shown in these drawings is the same as that of the conventional terminal shown in FIG. 5, the same or common parts are denoted by the same reference numerals and overlapped. Description is omitted.

  The terminal portion 10 includes a tubular member 10b having a circular cross section, a plate-like connection terminal 10a that is fixed to one end of the tubular member 10b and has two bolt through holes at the center, and an outer periphery of the tubular member 10b that is flush with the other end surface. And an outer casing 10c extending radially from the surface. In the middle in the longitudinal direction of the tubular member 10b, there is a large-diameter compression portion 10d for compressing and connecting the conductor 27 of the cable end portion 21 and this. The lock nut 12 has an opening having a diameter slightly larger than the outer diameter of the tubular member 10b at the upper portion thereof, and allows the tubular portion between the compression portion 10d and the outer casing 10c to pass through the opening. Thus, it is attached so that it cannot escape from the tubular member 10b. As shown in FIG. 2, a ring-shaped waterproof packing 28 is interposed between the surface of the outer casing 10 c on the connection terminal 10 a side and the upper inner surface of the lock nut 12 having the opening.

  A fixed portion 13 is fixed to the distal end portion of the insulator tube 11. A screw portion 13a is provided on the outer peripheral surface of the fixing portion 13, and the lock nut 12 is screwed into the screw portion 13a, whereby the waterproof packing 28 between the upper inner surface and the outer casing 10c is provided. While being compressed and maintaining a watertight state between the terminal portion 10 and the fixing portion 13, the terminal portion 10 is detachably fixed to the fixing portion 13 fixed to the distal end of the insulating tube 14.

  FIG. 3 shows an enlarged view of another example of the terminal portion of the outdoor insulator terminal of the present invention shown in FIG. 1 (illustration of the insulator tube is omitted). In the terminal portion 10 shown in this figure, a notch 18 is provided in the tubular member 10b along the length direction, and a cross section perpendicular to the length direction of the tubular member 10b is substantially C-shaped. Yes. Thus, by providing the notch 18 in the tubular member 10b, the conductor can be inserted while confirming the insertion state of the conductor 27 of the cable end 21 into the tubular member 10b of the terminal portion 10.

  FIG. 4 shows an enlarged view of still another example of the terminal portion of the outdoor type tubular terminal of the present invention shown in FIG. 1, and the illustration of the insulated pipe is omitted as in FIG. The terminal portion 10 shown in this figure is provided with two through holes 19 and 19 penetrating inward and outward along the length direction in a compression portion 10d provided in an intermediate region of the tubular member 10b. By perforating the through-holes 19 and 19, when the conductor 27 of the cable end portion 21 is accommodated in the accommodating space 11 inside the tubular member 10b, the insulating compound applied to the conductor surface leaks. It can be confirmed that the conductor 27 is reliably accommodated in the conductor accommodating space 11 in the terminal portion 10. The through hole 19 can also be provided on the outer peripheral surface of the tubular member 10b by removing the position of the notch 18 in the terminal portion 10 having the notch 18 shown in FIG.

  Furthermore, in the present invention, if necessary to securely connect the conductor of the cable end 21 to the terminal portion, a known sleeve (not shown) is used so as not to cause cracking or bending of the conductor of the cable end. Thus, at least the outer peripheral surface of the conductor can be covered. This sleeve is formed of a conductive material in a cylindrical shape. Preferably, the sleeve may have an opening at one end in the tube axis direction closed so that the distal end surface and the outer peripheral surface of the conductor 27 can be covered.

  Next, the cable terminal processing method using the outdoor tubular terminal 1 of the present embodiment will be described. In attaching the outdoor tubular terminal 1, the cable end 21 is stripped in advance, and the metal shielding tape layer 23, the external semiconductive layer 25, the insulating layer 26, and the conductor 27 are removed from the sheath at the end. Are sequentially exposed. At this time, if necessary, the sleeve can be put on the conductor 27 as described above.

  With the terminal part separated from the fixing part of the insulator tube, the stripped cable end part 21 is inserted from the cable insertion port 14b of the insulator pipe 14, and the conductor 27 of the cable end part 21 protrudes from the opening 14a at the distal end of the fixing part. Let At that time, an insulating compound is filled between the inside of the insulator tube 14 and the cable end 21. This insulating compound may be filled in the inside of the insulation tube in advance, or may be filled after the cable end portion is inserted.

  Next, the conductor containing space 11 of the terminal portion 10 is filled with an insulating compound, the terminal portion 10 is covered with the conductor 27 protruding from the tip of the fixing portion, and a lock nut is placed on the screw portion on the outer peripheral surface of the fixing portion 13. The terminal portion 10 and the fixing portion 13 are fixed by screwing and tightening. Thus, since the terminal part 10 is covered with the conductor 27, the crack of the conductor 27 etc. do not arise. Further, the tubular member of the terminal portion 10 may be formed in a substantially C-shaped cross section and / or a through hole may be provided on the peripheral surface thereof to check the insertion state of the conductor 27 into the terminal portion 10. . Thereafter, the conductor 27 and the terminal portion 10 are connected by compressing or crimping a predetermined portion of the tubular member using a predetermined compression tool or crimping tool.

  As described above, by using the outdoor tubular terminal of the present invention, the conductor at the end of the cable abuts on any part of the tubular tube so that the terminal portion is connected to the upper terminal composed of the terminal portion and the fixed portion. Since it was decided to be detachably fixed to the fixing part, this terminal part was removed from the fixing part when the cable end part was processed, and the cable end was inserted into the insulation tube and the conductor protruded from the tip part. Can be fixed to the fixing part so that the terminal part can be covered with, so that the conductor at the end of the cable can be reliably accommodated in the conductor accommodating chamber in the terminal part, and the cable conductor and the terminal part can be reliably connected. it can.

  Moreover, since the insulator terminal for outdoor use of the present invention can be removed from the insulator tube only when the terminal part needs to be replaced, it is necessary to replace the terminal part as a whole. Work time and material costs can be reduced.

It is a figure which shows an example of embodiment of the outdoor insulator type | mold terminal of this invention. FIG. 2 is an enlarged cross-sectional view of a portion surrounded by an ellipse in FIG. 1. It is a figure which shows another example of the terminal part in this invention. It is a figure which shows another example of the terminal part in this invention. It is a figure which shows an example of a general outdoor pipe terminal. It is a figure which shows the step peeling state of a cable edge part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outdoor insulator terminal 10 Terminal part 10a Plate-shaped connection terminal 10b Tubular member 10c Outer casing 11 Conductor accommodation space 12 Lock nut 13 Fixing part 14 Insulation pipe 15 Stress cone 16 Support metal fitting 17 Insulation compound 18 Notch 19 Through-hole 21 Cable end 22 Sheath 23 Metal shielding tape layer 24 Ground wire 25 External semiconductive layer 26 Insulator layer 27 Conductor 28 Waterproof packing

Claims (7)

A cylindrical insulator tube that is stepped and through which a cable end with a conductor exposed at the tip is inserted, a tip portion thereof or a fixing portion fixed in a watertight state to the tip portion ,
A tubular member having a substantially C-shaped cross-section having a notch along the length direction; the conductor that is detachably fixed to the fixing portion and protrudes outward in the tube axis direction of the insulator tube; A terminal part that can be accommodated and connected to the terminal,
A cable-embedded outdoor terminal for a cable, comprising: a watertight member that maintains a watertight state between the terminal portion and the fixing portion when the terminal portion is fixed to the distal end portion or the fixing portion.   The terminal portion is provided with a lock nut at the end on the side of the garment tube so as not to escape, and is screwed into a threaded portion formed on the distal end portion of the gait tube or the outer peripheral surface of the fixing portion. 2. The outdoor insulator type terminal according to claim 1, wherein the terminal is detachably fixed to a tip of the insulator pipe. The outdoor tubular terminal according to claim 1 or 2 , wherein the tubular member includes at least one through-hole penetrating inside and outside the member. The outdoor conductor pipe type terminal according to any one of claims 1 to 3 , wherein a sleeve capable of covering at least an outer peripheral surface of the conductor is attached to the conductor. A fixing part that is fixed in a watertight manner to the tip of the garment tube;
A tubular member having a substantially C-shaped cross section that is detachably fixed to the fixing portion, extends outward in the tube axis direction of the garment tube, and has a notch along the length direction; A terminal portion that accommodates and can be connected to the conductor exposed at the end of the cable stripped inside ;
An upper fitting for an outdoor potato tube type terminal comprising a watertight member that maintains a watertight state between the two when the terminal portion is fixed to the fixing portion. The terminal portion is detachably fixed to a screw nut formed on an outer peripheral surface of the fixing portion by screwing a lock nut provided at an end portion on the fixing portion side so as not to be escaped. Item 6. An upper metal fitting for an outdoor insulator tube type terminal according to Item 5 . The upper metal fitting for an outdoor garment tubular terminal according to claim 5 or 6 , wherein the tubular member includes at least one through-hole penetrating inside and outside the member.

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