JP2001057733A - Capable connection part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cable connection part that is compact and has a simple structure for securing connecting a cable without requiring special tools, at the same time minimizing the move of a stress cone, when easily eliminating the cable for separating the cable with improved working efficiency. SOLUTION: A cable connection material 1 is arranged at a cable tip conductor part 12 and is provided with conduction parts 13 and 15 that are adapted to a connection hole 4 of an inner conductor 2 for electrical contact, and a detaining unit 20 that is arranged adjacent to the conduction parts, and locks a connection material 100 for the cable connection part 1 by moving the stress cone 104 of the connection material 100 to the side of the conduction parts for installing at a given position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable connection portion, and more particularly to a device direct connection type terminal connection portion used for connection to devices such as a transformer and a circuit breaker at a terminal of a power cable. However, the present invention can also be suitably used as a straight connection portion of a cable.

[0002]

2. Description of the Related Art FIG. 5 shows an embodiment in which a cable connecting portion 1A of a power cable 10 such as a CV cable is vertically attached to equipment from below. FIG. 6 shows a configuration of an in-oil terminal connection portion 1A which is an example of such a device direct connection type terminal connection portion.

[0003] As shown in this example, a connection material 100 for a cable connection portion 1A is generally configured as follows.

[0004] That is, as can be better understood with reference to FIG. 6, a tip conductor 12 is exposed from a cable-terminated end 11 of the power cable 10, and the tip conductor 12 has a cylindrical shape. The wedge 51 is fixed.
Also, adjacent to the wedge 51, a wedge tightening bracket 5 is provided.
3 are arranged.

In this state, the cable terminal portion 11 is inserted into a connection receiving hole formed by the receiving hole 6 of the epoxy bushing 3 and the connecting hole 4 of the conductor pull-out bar 2.

Although the lower metal fitting 101, the compression device 102, the pressing metal fitting 103, the stress cone 104, and the like are mounted on the cable end portion 11 which has been subjected to the terminal treatment, the wedge tightening metal fitting 53 can be rotated with a tool. , Has been pulled down on the cable to the retracted position.

[0007] Next, the wedge tightening fitting 53 is rotated and screwed into the conductor pull-out rod 2, thereby forming the wedge 51.
Is pressed, the outer peripheral surface of the wedge 51 is pressed against the connection hole 4 and locked.

[0008] Thereafter, as shown in FIG. 6, the stress cone 104 is inserted into the receiving hole 6, and the compression device 102 and the press fitting 103 are fixed in place using the lower fitting 101. The lower metal fitting 101 has a bushing end face flange 5.
Is attached with bolts 105.

[0009]

As described above, according to the conventional cable connecting portion 1A, the cable 10 is connected to the connecting portion 1A.
A, the lower metal fitting 10 is screwed into the screw hole 52 of the conductor pull-out rod 2 when the wedge tightening metal fitting 53 is screwed into the screw hole 52 of the conductor drawing rod 2.
1. The compression device 102, the push fitting 103, the stress cone 104, etc. are pulled down on the cable to the retracted position to the extent that the wedge fastening fitting 53 can be rotated by a tool, and the wedge fastening fitting 53 is rotated to draw out the conductor. Stick 2
After that, the stress cone 104 is inserted into the receiving hole 6, and the compression device 102 and the press fitting 103 are required to be attached to predetermined positions by the lower fitting 101.

On the other hand, it is necessary to remove the cable 10 connected to the connection portion 1A from the connection portion 1A, for example, to replace a power cable.

In order to remove the cable 10 connected to the connecting portion 1A from the connecting portion 1A having the above structure, the wedge 51 of the cable end conductor 12 is strongly locked in the connecting hole 4 of the conductor drawing rod 2 by a wedge fastening member 53. Therefore, the cable 10 cannot be separated from the connecting portion 1A simply by pulling the cable 10, and the above-described operation procedure at the time of connection needs to be performed in reverse.

That is, first, the lower metal fitting 101, the compression device 102, the pressing metal fitting 103, and the stress cone 104 are retracted on the cable to such an extent that the wedge tightening metal fitting 53 can be rotated by a tool (not shown). The wedge tightening tool 53 is rotated using the work space thus formed, and the locked state between the wedge 51 and the conductor extraction rod connection hole 4 is released. By pulling the cable 10 in this state, the cable 10 can be detached from the connecting portion 1A.

[0013] However, in particular, the stress cone 1 is so large that the wedge fastener 53 can be rotated by a tool.
It is extremely difficult to move the cable 04 by shifting the outer peripheral surface of the cable, and it takes a lot of time. In particular, when the cable is pulled out after a long period of time, the stress cone 104 is deteriorated and adheres to the cable core, so that the cable may not come off.

As described above, the conventional cable connection section 1A
According to the method, much time is required for attaching and detaching the cable 10 to and from the connecting portion 1A, and there is a problem in workability. Furthermore, according to the structure of the conventional cable connecting portion 1A,
In order to rotate the wedge fastener 53, a special tool was also required.

Accordingly, an object of the present invention is to provide a reliable connection of a cable without the need for a special tool, and to minimize the movement of a stress cone when removing a cable, thereby improving work efficiency and efficiency. An object of the present invention is to provide a cable connecting portion having a small size and a simple structure that can easily separate a cable.

[0016]

The above object is achieved by a cable connection according to the present invention. In summary, the present invention comprises an inner conductor, and a bushing integrally formed of resin around the inner conductor, and a connection formed by a connection hole of the inner conductor and a receiving hole of the bushing. In the cable connection portion in which the cable connection material is detachably mounted in the receiving hole, (A) the cable connection material is disposed in the conductor portion at the cable tip, and makes electrical contact with the connection hole of the inner conductor. An energizing section, disposed adjacent to the energizing section, by moving the stress cone of the connecting material to the energizing section side and setting the stress cone at a predetermined position, the connecting material is locked with respect to the cable connecting section. And (B) a stopper moved by a stress cone of a cable connecting material, and a connection of the inner conductor by the stopper. (C) when the cable is detached from the cable connection portion, the stress cone of the cable connection material is connected to the energization portion when the cable is detached from the cable connection portion. A cable connecting portion characterized by releasing the lock of the ring-shaped elastic locking member to the cable connecting portion by retracting from the bushing in a direction away from the cable connecting portion.

According to an embodiment of the present invention, the stopper is adapted to (a) be movable in the axial direction of the cable in an annular space defined between the outer periphery of the cable terminal and the bushing receiving hole. (B) an operating portion adapted to be movable in the axial direction of the cable in an annular space defined between the outer periphery of the tip conductor portion of the current-carrying portion and the connection hole of the inner conductor. And (c) an annular shoulder connecting the support portion and the action portion, wherein an end surface of the support portion is capable of contacting an end surface of a stress cone of the connection material,
The end surface of the action portion is an inclined surface inclined toward the tip conductor portion, and the ring-shaped elastic locking member is disposed between the energizing portion and the stopper action portion, and the cable connection material is formed. When mounted in the connection receiving hole, the annular elastic locking member is pushed outward in the radial direction by the stopper action portion, and is partially recessed into an annular groove formed in the connection hole of the internal conductor. When the cable is locked with respect to the cable connection portion and the cable connection material is detached from the cable connection portion, the stress cone of the cable connection material is retracted from the bushing and the stopper is moved, whereby the stopper is moved. By releasing the engagement between the annular locking member and the annular groove, which has been partially recessed in the annular groove of the inner conductor, the cable is locked to the cable connection portion. To cancel.

According to another embodiment of the present invention, the elastic locking member is a ring-shaped coil spring or a C-shaped elastic ring.

[0019] According to still another embodiment of the present invention, the cable connection portion is an equipment direct connection type terminal connection portion, and the internal conductor is a conductor lead bar.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cable connecting portion according to the present invention will be described in more detail with reference to the drawings.

FIG. 1 shows an embodiment of the cable connecting portion 1 of the present invention. In the present embodiment, the connection unit 1 will be described as being embodied as a device direct connection type terminal connection unit used for connection with devices such as a transformer and a circuit breaker as shown in FIG. The cable connection of the present invention is not limited to this, and the principle of the present invention can be effectively applied to the aerial terminal connection and also to the straight connection of the cable.

In this embodiment, the cable connecting portion 1 includes a conductor lead bar 2 as an internal conductor, and a bushing 3 made of epoxy resin is integrally formed around the conductor lead bar 2. In the present embodiment, the conductor lead rod 2 has a connection hole 4 formed therein, and one end side of the bushing 3, one end 2a of the upper conductor lead rod 2 in FIG. 1 is closed, and the lower end on the opposite side. The side 2b is open.

One end 2a of the conductor pull-out bar 2 is exposed from the upper end of the bushing 3, and the other side of the bushing 3, that is, the lower side in FIG. A mounting flange 5 for mounting 100 is provided. A receiving hole 6 is formed on the mounting flange 5 side of the bushing 3 so that the connecting material 100 can be attached thereto. An upper end of the receiving hole 6 communicates with the connecting hole 4 of the conductor lead rod 2. That is, a connection receiving hole for the connection material 100 is formed by the connection hole 4 formed in the conductor extraction rod 2 and the reception hole 6 formed in the bushing 3 in communication with the connection hole 4.

According to the present invention, the cable connecting material 100 to be connected to the connecting portion 1 is configured as follows.

As will be better understood with reference also to FIG. 2, a terminated cable terminal 1 of a cable 10 is provided.
A plug 13 for making electrical contact with the conductor pull-out bar 2 is mounted on the cable tip conductor portion 12 exposed from 1 in order to form a current-carrying portion for the conductor pull-out bar 2.
The plug 13 is fixed to the conductor portion 12 in a tip region of the tip conductor portion 12. An annular groove 14 is formed on the outer peripheral surface of the plug 13, and a contact 15 such as a multi-ram band configured by arranging a number of ribbon-shaped leaf spring assemblies in an annular shape is arranged therein. . Connect cable 10 to connection 1
When the multi-ram band 15 is connected, the multi-ram band 15 is fitted to the connection hole 4 of the conductor lead bar 2 and makes electrical contact.

According to the present invention, the plug 13 fixed to the tip conductor portion 12 and the insulator end face 1 of the cable terminal portion 11 are provided.
1a, a retaining device 20 for preventing the cable 10 from being pulled out from the connection portion 1 is disposed.

The retaining device 20 has a stepped cylindrical stopper 21 which is disposed in the vicinity of the cable insulator end face 11a of the cable end portion 11 and is movable in the axial direction of the cable. The stopper 21 has a large diameter that is adapted to be movable in the axial direction of the cable, that is, in the present embodiment, vertically in an annular space defined between the outer periphery of the cable terminal portion and the bushing receiving hole 6. In an annular space defined between the support portion 22, the outer periphery of the distal end conductor portion 12, and the connection hole 4 of the conductor lead-out rod 2, it is adapted to be movable in the axial direction of the cable, that is, in the vertical direction. It has an operating portion 23 having a small diameter, and an annular shoulder portion 24 connecting the supporting portion 22 and the operating portion 23. The lower end surface 25 of the support portion 22 is in contact with the upper end surface 104a of the stress cone 104 of the connection material 100,
The upper end surface of the action portion 23 faces upward,
The inclined surface 26 is inclined toward the side. The stopper 21 can be made of an insulating FRP (fiber reinforced resin), but can also be made of a metal such as conductive brass.

According to the present invention, a ring-shaped elastic locking member is provided between the plug 13 and the action portion inclined surface 26 of the stopper 21.
In this embodiment, a spring ring 30 formed by connecting tension coil springs in a ring shape is arranged. Spring ring 30
In this example, a close-wound spring having an outer diameter of 5 mm and a length of 30 mm was produced using a piano wire having a wire diameter of 0.5 mm, and both ends were connected to form a ring. The spring ring 30 was elastically attached to the outer periphery of the tip conductor portion 12 having an outer diameter of 16 mm.

According to the present invention, the connection hole 4
An annular locking groove 7 through which the spring ring 30 can enter and exit is formed in the circumferential direction.

Next, a procedure for attaching and detaching the cable connecting material 100 to and from the cable connecting portion 1 of the present invention having the above-described structure will be described.

First, as shown in FIG. 2, a cable connecting material 100 is assembled to the cable terminal portion 11 which has been subjected to the terminal treatment. That is, the cable 10 connected to the connection unit 1
Is a lower metal fitting 101, a compression device 102, a pressing metal fitting 10
3. The stress cone 104 and the like are passed through the cable end portion 11 which has been subjected to the terminal treatment, and then the stopper 21 of the retaining device 20 is attached to the cable end portion 11 from the conductor end portion 12 of the cable. The stopper 21 has an end surface 24a of the annular shoulder portion 24 abutting on the end surface 11a of the cable end, a large-diameter support portion 22 on an outer periphery of the cable end portion, and a small-diameter action portion 23 on an outer periphery of the conductor portion 12, respectively. Adapted. Further, the spring ring 30 is elastically mounted above the small-diameter action portion 23. Subsequently, the plug 13 having the multi-ram band 15 is fixed to the tip conductor portion 12. In some cases, the spring ring 30 may be mounted between the lower end portion of the plug 13 and the upper end inclined surface 26 of the small-diameter action portion 23 after the plug 13 is fixed to the conductor portion 12.

Next, as shown in FIG. 1, when the cable connection material 100 is inserted into the connection receiving hole composed of the connection hole 4 and the receiving hole 6, the plug 1 having the multi-ram band 15 is inserted.
3 is fitted in the connection hole 4 of the conductor lead rod 2 and makes electrical contact. At this time, the cable 10 itself has the tip of the tip conductor portion 12, in this embodiment, the upper end surface 12 a abuts on the closed end of the connection hole 4, in this embodiment, the upper end surface 4 a, and the cable 10 further extends. Upward movement is prevented.

The stopper 21 of the retaining device 20 has an action portion 23 which fits in the annular space between the connection hole 4 of the conductor pull-out bar 2 and the conductor portion 12, and a support portion 22 which is provided with a receiving hole of the bushing 3. It fits into the annular space between the cable end 6 and the cable end 11 and is inserted.

Further, when the stress cone 104 is pushed upward into the receiving hole 6 in this embodiment, the stress cone 1
The end surface 104a of the 04 comes into contact with the end surface 25 of the large-diameter support portion 22, and the stopper 21 is moved upward by pressing it toward the plug. That is, the end surface 24a of the annular shoulder portion of the stopper 21 is separated from the end surface 11a of the cable terminal portion and moves upward.

As the stopper 21 moves upward, the inclined surface 26 at the tip of the acting portion comes into contact with the spring ring 30, and pushes the spring ring radially outward against the elastic force of the spring ring 30. As a result, the spring ring 30 is moved outward in the radial direction, and is partially recessed into the annular groove 7 formed in the connection hole 4 of the conductor extraction rod 2. However, the spring ring 30 is not completely pushed into the annular groove 7. FIG. 1 shows this state.

In the above state shown in FIG.
Prevents the plug 13 from moving downward, and at the same time,
The spring ring 30 also prevents the stopper 21 from moving further upward. Therefore, the cable 10 is locked in the connection portion 1 and is prevented from being pulled out from the connection portion 1.

In this state, the flange 1 of the lower
01a to the bushing end face mounting flange 5 with the bolt 10
By fixing at 5, the stress cone 104, the press fitting 103, and the compression device 102 are pressed by the lower fitting 101, and are fixed in place.

When the cable 10 connected to the connection section 1 is removed from the connection section 1, the operation procedure at the time of connection is performed in reverse.

That is, first, as shown in FIG. 3, the bolt 105 is removed, and the lower bracket 101 is moved downward from the bushing end face mounting flange 5. Thereby, the compression device 102 and the press fitting 103 can also be shifted downward to a predetermined position.

Next, the stress cone 104 is shifted downward by a small distance of about several millimeters. As a result, the stress cone 10 pushing the stopper 21 upward is
The biasing force of 4 is lost. Therefore, the elastic force acting on the inclined surface 26 of the action portion 23 of the stopper 21 to reduce the diameter of the spring ring 30 inward moves the stopper 21 downward, and the end face of the annular shoulder 24 of the stopper. 24a comes into contact with the end surface 11a of the cable terminal portion 11.

The spring ring 30 partially indented in the annular groove 7 of the conductor pull-out rod 2 is reduced in diameter as the stopper 21 moves downward, and is wound around the outer periphery of the conductor portion 12. As a result, the lock on the connection portion 1 of the cable 10 is released. Since the outer diameter of the spring ring 30 is smaller than the connection hole 4 of the conductor pull-out bar 2, in the state of FIG.
When the cable is urged downward, the cable tip conductor 12 having the plug 13, the spring ring 30, the stopper 21
At the same time, the cable connection material 100 can be integrally pulled out from the cable connection portion 1.

As described above, according to the present invention, the movement of the stress cone 104 at the time of disconnection of the cable is such that the spring ring 30 which has been recessed in the annular groove 7 of the conductor pull-out rod 2 moves in the radially inward direction. It is sufficient to move the stopper 21 downward from the inside of the annular groove 7, that is, only 1 mm to several millimeters downward, and to rotate the wedge fastener 53 shown in FIG. When compared to the distance to move, for example, 160 mm, the stress cone 1
04 can be greatly reduced, and work efficiency can be significantly improved. Further, according to the present invention, when attaching and detaching the cable connecting material 100 to and from the connecting portion 1, it is not necessary to largely shift the stress cone 104, so that the overall configuration of the cable connecting portion 1 can be made extremely compact. .

In the above embodiment, the ring-shaped elastic locking member 30
Has been described as a ring-shaped spring, but it may be a C-shaped elastic ring as shown in FIG. 4, that is, a C-ring. In this case, the same operation as in the above embodiment can be performed, and the same operation and effect can be obtained.

[0044]

As described above, according to the present invention,
An inner conductor and a bushing integrally formed of resin around the inner conductor. A cable connection material is detachably attached to a connection receiving hole formed by a connection hole of the inner conductor and a receiving hole of the bushing. In the cable connection portion to be mounted, (A) the cable connection material is disposed in the conductor portion of the cable end, and is provided adjacent to the current-carrying portion, the current-carrying portion being adapted to make electrical contact with the connection hole of the inner conductor. A locking device that can lock the connection material with respect to the cable connection portion by moving the stress cone of the connection material to the current-carrying portion side and setting the stress cone at a predetermined position,
(B) The retaining device comprises: a stopper moved by a stress cone of a cable connecting material; and a ring-shaped elastic locking member partially recessed into an annular groove formed in a connection hole of the inner conductor by the stopper. (C) When the cable is detached from the cable connection portion, the stress cone of the cable connection material is retracted from the bushing in a direction away from the current-carrying portion to release the lock of the ring-shaped elastic locking member to the cable connection portion. So that the cable can be securely connected without the need for special tools, and when removing the cable, the movement of the stress cone is minimized so that the cable can be connected efficiently and easily. Can be separated, and the structure is small and simple.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a cable connecting portion according to the present invention.

FIG. 2 is a view for explaining a mode of connecting a cable connecting material in the cable connecting section of FIG. 1;

FIG. 3 is a view for explaining an aspect in which a lock is released in the cable connection section of FIG. 1;

FIG. 4 is a perspective view showing another embodiment of the ring-shaped elastic locking member.

FIG. 5 is a front view for explaining an equipment direct connection type terminal connection portion to which the cable connection portion of the present invention can be applied.

FIG. 6 is a schematic configuration diagram of a conventional cable connection unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cable connection part 2 Inner conductor (conductor pull-out bar) 3 Bushing 4 Connection hole 6 Reception hole 7 Annular groove 10 Power cable 11 Cable terminal part 12 Tip conductor part 13 Plug 15 Contact (multi-ram band) 20 Retention device 21 Stopper REFERENCE SIGNS LIST 22 support portion 23 action portion 24 annular shoulder portion 26 inclined surface 30 annular elastic locking member (spring ring) 100 cable connection material 101 lower metal fitting 102 compression device 103 pressing metal fitting 104 stress cone

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoya Hasegawa 2-1-1, Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term in Showa Electric Wire & Cable Co., Ltd. 5G375 AA02 BA22 BB08 BB17 BB24 BB26 CA02 CA13 CB05 CB14 CB36 DA32 DB13

Claims (4)

[Claims] An internal conductor and a bushing integrally formed of resin around the internal conductor. A connection receiving hole formed by a connection hole of the internal conductor and a receiving hole of the bushing. In a cable connecting portion to which a cable connecting material is detachably attached, (A) the cable connecting material is disposed on a conductor portion of a cable end, and is provided with an energizing portion adapted to be electrically connected to a connection hole of the inner conductor. Disposing the connecting material in a locked state with respect to the cable connecting portion by disposing the stress cone of the connecting material toward the energizing portion side and installing the stress cone at a predetermined position. And (B) the stopper is formed in a connection hole of the inner conductor by a stopper moved by a stress cone of a cable connecting material. (C) when the cable is detached from the cable connection portion, the stress cone of the cable connection material is separated from the current-carrying portion. A cable connecting part wherein the lock of the ring-shaped elastic locking member with respect to the cable connecting part is released by being retracted from the bushing in the direction. 2. The stopper according to claim 1, wherein: (a) a support portion adapted to be movable in an axial direction of the cable in an annular space defined between an outer periphery of a cable terminal portion and the bushing receiving hole; (C) an operating portion adapted to be movable in the axial direction of the cable in an annular space defined between the outer periphery of the tip conductor portion of the current-carrying portion and the connection hole of the inner conductor;
An end surface of the support portion, the end surface of the stress cone being capable of contacting the end surface of the stress cone of the connection material; When the ring-shaped elastic locking member is disposed between the current-carrying part and the stopper action part, and the cable connection material is attached to the connection receiving hole, The ring-shaped elastic locking member is pushed outward in the radial direction by the stopper action portion, and is partially recessed into an annular groove formed in the connection hole of the internal conductor, thereby connecting the cable to the cable connection portion. When the cable connection material is detached from the cable connection portion in the locked state, the stress cone of the cable connection material is retracted from the bushing to move the stopper, whereby the ring of the inner conductor is moved. The lock on the cable connection portion of the cable is released by releasing the locked state between the annular locking member and the annular groove partially indented in the groove. Item 2. The cable connection part according to item 1. 3. The cable connecting part according to claim 1, wherein the elastic locking member is a ring-shaped coil spring or a C-shaped elastic ring. 4. The cable connection part according to claim 1, wherein said cable connection part is a device direct connection type terminal connection part, and said internal conductor is a conductor lead rod.