JPH0656973U - Clamp type connector for insulated wire - Google Patents

Abstract

(57) [Abstract] [Purpose] Relating to the improvement of the clamp type connector for insulated wire used for insulator protection devices, etc., in particular, the connector equipped with a needle electrode (needle part of the needle fitting) and the core wire of the insulated wire are secured. It is designed to make electrical contact. [Structure] A wire holding metal fitting 28 is provided inside a lower portion of a substantially C-shaped metal fitting 26 for inserting an insulated wire. An electric wire biting portion 28b, which is arranged in a substantially V shape and has a blade-shaped tip portion, is provided at the upper end of the electric wire holding metal fitting. A needle fitting 27 is provided inside the upper portion of the main body fitting 26 such that the needle portion 27a thereof projects toward the center of the electric wire biting portion 28b. Further, the main body metal fitting 26 is provided with a tightening screw 29 for advancing and retracting the electric wire pressing metal fitting 28 with respect to the needle metal fitting 27.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a clamp-type connector for electrically and mechanically connecting to an electric wire of a high-voltage power distribution line, and more particularly to a structure for ensuring electrical contact with a core wire of an insulated electric wire.

[0002]

[Prior art]

 An insulated wire support device for a high-voltage power distribution line is provided with an insulator protection device for the purpose of preventing the insulated wire from being broken or the insulator from being damaged by a follow current arc.

As shown by reference numeral 100 in FIG. 14, the protective device supports a lower portion of a supporting insulator 101 by a grounding side mounting member 110 such as a armband, and binds a binding wire or a winding grip to a head 101 a of the supporting insulator 101. In contrast to the insulating support device that supports the insulated wire 103 by the metal supporting member 102 such as the above, a ring-shaped discharge electrode 104 is attached to the body portion 101b of the supporting insulator 101 located under the wire 103, and the insulated wire 103 The current limiting element unit 105 is provided on the head 101a of the supporting insulator 101 located above, and one charging unit side electrode 106 of the unit 105 is connected to the insulated wire 103 by the clamp type connector 107 and the other is grounded. The side electrodes 108 are electrically connected to the discharge electrodes 104, respectively.

[0004]

[Problems to be solved by the device]

 When a lightning surge enters, the core wire of the insulated wire 103-clamp type connector 107-charge side electrode 106-current limiting element unit 105-ground side electrode 108-discharge electrode 104-discharge gap G-ground side attachment The serge is discharged (flashed) to the ground through the path of the member 110-. The current limiting element unit 105 and the discharge gap G forming the discharge path are connected in series to interrupt the follow-up arc and insulate. The wire 103 is prevented from being broken and the insulator body is prevented from being damaged.

By the way, in the clamp-type connector 107 of the protection device 100, when connecting with the insulated wire 103 as shown in FIG. 15, the needle electrode 109 escapes laterally by tightening the tightening screw 108. In some cases, the coating 103b of the electric wire 103 is not broken, and the sharp needle electrode 109 is disengaged from the core wire due to the vibration or swing of the electric wire and becomes in a non-contact state.

Therefore, in such a non-contact state or an incomplete contact state, when a lightning surge enters the distribution line, there is a discharge delay or the discharge path is not accurately formed, so that the insulated wire is not formed. There was a problem that the support insulator could not be sufficiently protected.

Further, in the clamp type connector 107, the contact with the core wire is made only by the needle electrode, and the current concentration is likely to occur. Therefore, when the large current is discharged, the current concentration causes the needle electrode 109 to melt. There is a problem in that there is a loss or a meltdown accident of the core wire 103a occurs.

[0008]

[Means for Solving the Problems]

 The present invention is to solve the above problems. The first invention is to provide an electric wire holding metal fitting (28) inside a lower portion of a substantially C-shaped metal fitting (26) for inserting an insulated wire. An electric wire biting portion (28b), which is arranged in a substantially V shape and has a blade-shaped tip, is provided at the upper end of the wire holding metal fitting, and a needle fitting (27) is provided inside the upper portion of the main body fitting (26). The needle portion (27a) is provided so as to project toward the center of the electric wire biting portion (28b). Further, the main body metal fitting (26) is provided with the above electric wire pressing metal fitting (28) on the needle metal fitting (27). It is characterized by including a tightening screw (29) for advancing and retracting.

According to a second aspect of the invention, a seal material (34) is attached to the wire biting portion (28b) of the wire pressing fitting (28) and the needle portion (27a) of the needle fitting (27). It is characterized by this.

[0010]

[Action]

 To clamp the insulated wire (25), fit a substantially C-shaped metal fitting (26) to the insulated wire (25), and rotate the tightening screw (29) in the tightening direction. Push the wire holding metal fitting (28) toward the needle metal fitting (27).

By this pushing up, the insulated electric wire (25) is pinched between the electric wire biting part (28b) and the needle part (27a) of the needle fitting (27), and the electric wire biting part (28b) is cut by the blade part. The needle portion (27a) pierces or cuts the insulating coating of the insulated electric wire (25) and surely contacts the core wire of the insulated electric wire (25) to maintain the energized state.

Further, at the time of this clamping, the electric wire biting part (28b) is formed in a substantially V shape, and the needle part (27a) is projected toward the center of the electric wire biting part (28b), so that the insulated wire (25) is pushed up with its center positioned and held at the center of the electric wire biting part (28b), and the needle coating (27a) breaks or cuts the insulating coating by the electric wire biting part (28b). It is ensured that the insulation coating is pierced at the center position of 25).

In the case where the seal material (34) is attached to the electric wire biting part (28b) and the needle part (27b), this is pressed when the tightening screw is tightened and flows into the cut hole of the insulating coating (25b). Then close the hole.

[0014]

【Example】

 An embodiment in which the clamp type connector of the present invention is used as an insulated wire connector of an insulator protection device will be described below with reference to FIGS. 6 and 12, reference numeral 1 denotes an insulator protection device in which the current limiting element unit 3 is mounted on the head 2a of the supporting insulator 2, and the device 1 includes the current limiting element unit 3 and an insulating holder. -4, a clamp type connector 5, a discharge electrode 6, a charging side electrode 7, a charging side auxiliary electrode 8, a ground side electrode 9 and a ground side auxiliary electrode 10.

Next, in the above description, the current limiting element unit 3 is, as is well known, a current limiting element 11 made of a cylindrical voltage non-linear resistor containing zinc oxide (ZnO) as a main component, and an insulating element made of FRP or the like. A cylinder 12, a charging side electrode 7 connected to both end surfaces thereof, a ground side electrode 9, a fastening pin 15, and a rubber integrally covering the outer peripheral surfaces of the element 11 and both electrodes 7, 9. Alternatively, it is composed of an insulating coating member 16 such as synthetic resin, and the charging side electrode 7 and the connector 5 are connected by a charging side auxiliary electrode 8 in the form of a lead wire. And the bases are connected by a ground-side auxiliary electrode 10 in the shape of a strand.

As shown in FIG. 10, a deep groove 23a is formed in a part of the ground side auxiliary electrode 10, and the protrusion 17a of the insulating mounting portion 17 on the discharge electrode side is fitted into the deep groove 23a. The watertightness at the joint between the two is improved.

Next, in the above, reference numeral 4 denotes a synthetic resin or rubber insulating holder for mounting the current limiting element unit 3 on the head 2a of the insulator 2, and as shown in FIG. The former adhered portion 4a, which is composed of a portion 4a and a holding portion 4b, is detachably fitted to the head portion 2a of the insulator body of the support insulator 2. The current limiting element unit 3 is detachably held by the holding portion 4b of the shape.

In consideration of workability such as attachment and detachment of the cover 4 to and from the insulator body 2, the adhered portion 4a is provided with a slit 4c on its peripheral surface and further on the lower end inside. Claw-shaped hooking portions 4d are formed respectively. Further, the holding portion 4b holds the current limiting element unit 3 by pushing it in from above, and both ends of the pushed-in unit 3 are further locked by the fastening portions 4e and the unit 3 is further pushed. The protrusion 23d of the insulator 23 of the ground side electrode 10 connected to is fitted into the recess 4f of the fastening portion 4e so as to prevent the unit 3 from rotating with respect to the holder-4. Reference numeral 4g denotes a water drain hole that penetrates from the holding portion 4b to the adhered portion 4a.

Next, reference numeral 6 denotes a discharge electrode, which has a ring shape as a whole as shown in FIGS. 9 and 10, and an insulating mounting portion 17 made of a band-shaped insulating member such as rubber or synthetic resin, and the mounting member 17. It is composed of a ring-shaped and two-divided discharge metal fitting portion 18 fixed to the portion 17, and the mounting portion 17 is opened and closed together with the discharge metal fitting portion 18 on the side of the connecting portions 17c, 17c facing the thin wall portion 17b. Further, both connecting portions 17c 1 and 17c 2 are provided with a hook portion 17d and a hook hole 17e that faces the hook portion 17d and can be inserted and removed.

The discharge electrode 6 is mounted in such a manner that the inner surface 17g of the protrusion 17f formed on the insulating mounting portion 17 is in close contact with the outer peripheral surface 2b of the insulator body. An appropriate space is formed between the inner peripheral surface 17h and the outer peripheral surface 2b of the insulator so that the rain-washing effect on the outer peripheral surface 2b of the insulator is not impaired.

Further, as shown in FIG. 12, the discharge metal fitting 18 of the discharge electrode 6 in the mounted state is a discharge metal fitting without changing the creepage distance between the metal fitting 18 and the ground-side mounting metal fittings 20 and 21. In order to make the creepage distance between the portion 18 and the binding wire 22 (or the winding grip) as long as possible, the deepest position in the deep groove 17j that is opened on the lower end 17i side formed in the mounting portion 17 as shown in FIG. And is stuck.

The upper end surface 17k of the protrusion 17f is formed into a curved surface that descends inward. For example, the shape of the main body insulator is attached to the cap portion 2c of the main body insulator 2 having a shape as shown in FIG. In this case, the upper end surface 17k is engaged with the lower surface side of the cap portion 2c of the insulator body so that the discharge electrode 6 is positioned with respect to the insulator body 2.

With the above configuration, the flash voltage value between the discharge electrode 6 and the bind wire 22 (or the winding grip) can be made higher than the limit voltage value of the current limiting element 11. As shown in FIG. 10, the ground side auxiliary electrode 10 is made of a rigid body such as a stainless wire, is entirely bent into an L shape, and its outer peripheral surface is stress-coiled by an insulator 23 such as rubber. One end 10a is connected to the discharge metal part 18 through the connection metal fitting 24, and the other end 10b is screwed to the ground electrode 9. In this case, the insulating coating 16 on the side of the current limiting element and the insulator 23 on the side of the grounding side auxiliary electrode 10 are bonded together at their joint surfaces 16c and 23c so that they are integrated.

Next, the clamp type connector 5 will be described in detail with reference to FIGS. 1 to 7. The connector 5 is for electrically connecting one end of the charging section side auxiliary electrode 8 connected to the current limiting element to the insulated wire 25.

In FIGS. 1 to 6, reference numeral 26 is a substantially C-shaped main metal member 26 for holding the insulated wire 25. Reference numeral 27 is a needle fitting, which is located on the upper side of the main fitting 26 and is screwed so that the needle portion 27 a thereof projects inward (downward). Reference numeral 28 denotes an electric wire holding metal fitting, which cooperates with the needle fitting 27 to hold the insulated electric wire 25. Reference numeral 29 denotes a tightening screw, which is screwed at a lower side of the main body metal fitting 26 in order to move the wire holding metal fitting 28 in a wire clamping direction (upper direction) or an anti-clamping direction (lower direction).

Reference numeral 31 is a band metal fitting for fixing the charging side auxiliary electrode 8 whose one end 8 a is screwed to the main body metal fitting 26 more securely to the main body metal fitting 26, so that the upper surface of the charging side auxiliary electrode 8 is pressed down. Both ends are fixed by the pin 30 and the screw 30a.

Reference numeral 32 denotes a pedestal made of polyethylene resin, and as shown in FIG. 7, has a semi-peripheral contact surface 32 a that matches the shape (coating diameter) of the insulating coating outer peripheral surface 25 b of the electric wire 25. Numerals 32b are fitting holes formed at the four corners, so that the biting portions 28b projecting from the both ends of the pressing fitting 28 are projected further upward from the contact surface 32a through the fitting holes 32b. It is inserted and fixed to the press fitting 28.

As shown in FIG. 5, the biting portion 28b has blade-shaped opposing sides, is substantially V-shaped, and is a wire-receiving type, and the insulated wire located on the contact surface 32a always bites. It is positioned so that it is located in the center of the recessed portion, and at the same time when the tightening screw 29 is tightened, the insulated wire 25 bites into the insulating coating 25b from both lower sides (cuts the insulating coating) to make sure contact with the core wire 25a. It is like this.

The needle portion 27a of the needle fitting 27 facing the electric wire biting portion 28b projects toward the center of the electric wire biting portion 28b, that is, toward the center of the insulated wire 25 on the electric wire biting portion. .

In FIG. 4, reference numeral 33 is a disc spring, which is inserted in the connecting portion between the tightening bolt 29 and the wire pressing metal fitting 28. When the tightening bolt 29 is moved upward, the disc spring 33 holds the electric wire. The metal fitting 28 is adapted to move upward.

As shown in FIG. 1, 34 is a strip-shaped self-fusing tape attached to the needle portion 27a of the needle fitting 27 and the wire biting portion 28b of the wire holding fitting 28 or a sealing material such as a sheet-like putty. is there.

Reference numeral 35 is a screw lock paint made of microcapsules applied to the screw portion 29 a of the tightening screw. In FIG. 12, 36 is a synthetic resin tightening torque management adapter fixed to the head 29b of the tightening screw 29, 37 is a connector cover made of an insulating member, and 38 is an insulating terminal cover.

The clamp-type connector 5 is connected to the insulated wire 25 as follows. First, the body metal fitting 26 is hooked on the insulated wire 25 and tightened with the tightening bolt 29. By this tightening, the electric wire biting portion 28b on the electric wire pressing metal fitting bites into the insulating coating 25b from the lower side of the insulated electric wire 25 (cuts the coating) and contacts the core wire 25a.

On the other hand, the needle portion 29a on the needle fitting side also pierces the insulating coating 25b from the upper side by the tightening of the tightening screw 29 and comes into contact with the core wire 25a. At the same time, the sealing material 34 attached to the needle portion 29a and the biting portion 28b is pressed by the above-mentioned tightening, and penetrates into the hole formed in the insulating coating 25b by the needle portion 27a and the electric wire biting portion 28b to close the hole. Prevents water from entering the wires.

By the above-mentioned tightening of the above-mentioned tightening screw 29, the operating portion side of the above-mentioned torque management adapter 36 is cut at its weak point with a predetermined torque value by tightening an operating tool (not shown). . Further, the screw lock paint 35 made of microcapsules applied to the screw portion 29a of the tightening bolt 29 is broken by this tightening, flows out to the screw screwing portion, and is screw locked so that the screw 29 does not loosen.

With the above configuration, the insulation is maintained by the discharge gap G formed between the discharge electrode 6 and the mounting brackets 20 and 21 in normal times, that is, when there is no lightning surge propagation, and the current limiting element 11 does not operate. Is in a state.

When a next lightning surge propagates in this state, the current limiting element 11 operates due to the surge and becomes a low resistance, a flashover occurs in the discharge gear G, and the surge is the insulated wire 25-connector. 5-Charge side auxiliary electrode 8-Charge side electrode 7-Current limiting element 11-Grounding side electrode 9-Grounding side auxiliary electrode 10-Discharge electrode 6-Discharge gap G-Mounting metal parts 20 and 21 are discharged to the ground. It

Therefore, since the lightning surge passes through the current limiting element 11 as described above, the element 11 cuts off the continuous flow of the commercial frequency. The above description is for the case where the lightning surge has a positive polarity, but when it has a negative polarity, it is discharged through the same discharge path in the opposite direction to the case of a positive polarity.

[0039]

[Effect of device]

 As described above, according to the clamp type connector of the present invention, when the tightening screw is tightened, the needle portion and the electric wire biting portion hold the insulated wire at a predetermined position to break through the insulation coating of the insulated wire or Since it can be cut, the needle portion and the electric wire biting portion can be surely brought into contact with the core wire, and the energized state can be maintained even when a large amount of discharge current flows, such as during discharge.

When the bite part and the needle part are provided with a seal member, this is pressed when the tightening screw is tightened and flows into the cut hole of the insulating coating, and the core wire is corroded to close the hole. It is possible to prevent disconnection accidents.

[Brief description of drawings]

FIG. 1 is a side view of a clamp-type connector of the present invention.

FIG. 2 is a side view of the connector with a pedestal and a sealing material removed.

FIG. 3 is a side view of FIG.

FIG. 4 is an enlarged view of a wire holding metal fitting part.

5 (a), (b), (c), and (d) show a front view, a plan view, a side view, and a cross-sectional view, respectively, of the wire holding metal fitting.

FIG. 6 is a partially cutaway view showing an insulated wire disconnection preventive device using the connector of the present invention.

7 (a), (b), (c) and (d) show a front view, a plan view, a sectional view taken along the line AA and a sectional view taken along the line BB of the pedestal, respectively.

8 (a), (b), (c), and (d) show a front view, a plan view, a bottom view, a side view, and a sectional view taken along line CC of the insulating holder, respectively.

FIG. 9 is a bottom view of the discharge electrode in a partially broken state.

FIG. 10 is a front view of FIG. 9 with a part broken away.

11 is an enlarged cross-sectional view of a circle D portion in FIG.

FIG. 12 is a mounting state diagram of the disconnection prevention device with a part omitted.

FIG. 13 is a mounting state diagram of a disconnection prevention device for supporting insulators having different shapes.

FIG. 14 is a front view of a conventional clamp-type connector.

FIG. 15 is a side view of a conventional clamp-type connector.

[Explanation of symbols]

 5 Clamp type connector 25 Insulated wire 25a Core wire 25b Insulation coating 26 Main body metal fitting 27 Needle metal fitting 27a Needle portion 28 Electric wire holding metal fitting 28b Electric wire biting portion 29 Tightening screw 34 Sealing material

Claims (2)

[Scope of utility model registration request] 1. A wire holding metal fitting (28) is provided inside a lower portion of a substantially C-shaped metal fitting (26) through which an insulated wire is inserted, and the wire holding metal fitting (28) is arranged in a substantially V shape at the upper end of the wire holding metal fitting. A wire-entry portion (28b) in the shape of a blade is provided, and a needle fitting (27) is provided inside the upper portion of the main body fitting (26) so that the needle portion (27a) faces the center of the wire-entry portion (28b). It is installed so that it protrudes, and further the main body metal fitting (2
In 6), the electric wire holding metal fitting (28) is attached with the needle metal fitting (2).
7) A clamp type connector for an insulated wire, comprising a tightening screw (29) for advancing and retracting with respect to 7). 2. The electric wire biting portion (28b) of the electric wire pressing metal fitting (28) and the needle portion (27a) of the needle metal fitting (27).
The clamp-type connector for an insulated wire according to claim 1, wherein a sealing material (34) is attached to the connector.