JP3352529B2 - Cable end structure for junction box and its outer plug - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable terminal structure suitable for connection to a terminal junction box provided in a high-voltage electrical device and an outer plug for the terminal structure.

[0002]

2. Description of the Related Art Power facilities are sometimes provided with a slip-on type termination junction box for easy connection with a cable. For connection to the terminal junction box, a plug as shown in FIG. 2 is applied to the end of the cable. In the plug 1, the body 2 is compressed in a hole 3 formed in the body 2 while receiving the conductor end 5 of the cable 4, and the plug 1 is fixed to the cable 4 by this compression connection. You. The cable 4 to which the plug 1 is fixed is inserted from the plug 1 into a connection box of a power facility,
It is electrically connected to this power equipment. However, depending on the specification of the junction box of the power equipment, for example, depending on the specification of the customer, the length dimension L of the body 2 required for the plug 1
Are different.

[0003]

For this reason, for example, two types of cables in which plugs according to the specifications of the respective electric power companies are fixed to the terminals in advance are prepared as power application cables for withstand voltage tests of electric power facilities. Needed. Therefore,
An object of the present invention is to provide a cable terminal structure applicable to a plurality of different specifications without requiring a plurality of types of cables, and a plug applicable to the terminal structure.

[0004]

In order to solve the above-mentioned problems, a cable terminal structure for a connection box according to the present invention comprises a plug fixed to a conductor end of a cable, and a plug covering the conductor end. Is divided into an inner plug that is fixed to the inner plug and a removable outer plug that covers the inner plug, and elasticity is provided between the outer plug and the inner plug to ensure electrical contact between them. A contact is provided, and the outer plug can be replaced according to the specification of the connection box. Also,
The outer plug according to the present invention has a body provided with a hole for receiving the inner plug fixed to the conductor end of the cable and covering the conductor end, a neck following the body, and a neck connected to the neck. A plurality of outer plugs each including a head, wherein only the length dimension of the trunk is different.

[0005]

In the cable terminal structure according to the present invention, only the outer plug attached to the inner plug fixed to the conductor end of the cable is replaced according to the specifications. In addition, since the outer plug of the present invention differs only in the length of the body portion, a desired outer plug is selected according to the specification, and the outer plug is detachably fixed to the inner plug. Can be adapted to the specification.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a front view showing a cable terminal structure according to the present invention with a part thereof cut away. The plug 10 according to the present invention includes a cylindrical inner plug 16 disposed over the conductor end 14 of the cable 12, and an outer plug 18 disposed over the inner plug 16 and disposed outside thereof. including.
Between the plugs 16 and 18, a fixing screw 20 and a generally cylindrical elastic contact 22 are arranged.

As shown in FIG. 3, the inner plug 16 has a constant inner diameter R at one end 16a, and its diameter gradually increases from the center toward the other end 16b. Thus, a tapered surface 24 is formed on the inner peripheral surface of the inner plug 16, and the inner plug 16 has a reduced diameter portion formed at the other end 16 b. An annular deep groove 26 for receiving the tip of the fixing screw 20 is formed substantially in the center of the outer peripheral surface of the inner plug 16. Further, between the deep groove 26 and the other end 16b, an annular wide shallow groove 28 for receiving the cylindrical elastic contact 22 is formed.

As shown in FIG. 4, the inner plug 16 is inserted so as to receive the conductor end 14 from one end 16a, and the vicinity of the end 16a is swaged from the outer periphery. Thus, the inner plug 16 is compression-connected to the conductor end 14. In order to strengthen the connection between the two 14 and 16, the inner plug 16
A wedge member 30 is driven into the conductor end 14 from the other end 16b of the wedge member 30. The wedge member 30 is provided on the tapered surface 2 of the inner plug 16.
In cooperation with 4, the inner plug 16 is reliably prevented from falling off. As a means for fixing the inner plug 16 to the conductor end portion 14, welding or other fixing means can be used. However, the use of the caulking and wedge members as described above makes the operation quicker and more reliable. Above.

Inner plug 16 fixed to conductor end 14
The cylindrical elastic contact 22 is mounted in the shallow groove 28.
As shown in an enlarged view in FIG. 5, the elastic contact 22 includes a plurality of leaf spring members 32, each of which bulges in an arc shape, and a band member 34 connecting each end of the leaf spring members 32. A well-known contact having:
The leaf spring member 32 is connected to the whole by a band-like member 34 in an annular shape.

The outer plug 18 is inserted with the elastic contact 22 mounted in the shallow groove 28 of the inner plug 16. As shown in FIG. 1, the outer plug 18 has a body 18a in which a hole 36 for receiving the inner plug 16 is defined.
And a neck 18b continuous with the reduced diameter portion formed on the body 18a, and a head 18c continuous with the neck 18b. A screw hole 38 that allows the fixing screw 20 to be inserted is formed in the body 18a.

The hole 36 formed in the body 18a has a predetermined depth and diameter sufficient to accommodate the inner plug 16 therein. The outer plug 18 is disposed so as to cover the inner plug 16, and the fixing screw 20 is provided in the screw hole 3.
8, and the tip of the fixing screw 20 projects into the deep groove 26 of the inner plug 16, so that the outer plug 18 is detachably fixed to the inner plug 16. In this fixed state, the fixing screw 20 does not protrude from the outer peripheral surface of the body 18a. Further, since the elastic contact 22 arranged in the shallow groove 28 of the inner plug 16 is pressed against the plugs 16 and 18, the electrical connection between the plugs 16 and 18 is ensured.

FIG. 6 is a longitudinal sectional view showing a connection box for receiving the cable terminal structure according to the present invention. Connection box 40 for receiving the end of cable 12 with plug 10 attached
Is provided with a cannula 42 having both ends open and formed by molding an epoxy resin, for example. The base of the sleeve 42 is provided with an annular fixing flange 48 disposed around a cable receiving port 46 formed in the frame 44 of the power equipment. The sleeve 42 is fixed to the frame 44 via bolts 50 with the fixing flange 48 so as to be located inside the apparatus.

A conductor 52 connected to an electric circuit of the device is fixed to the distal end of the sleeve 42 via a bolt 54, and the conductor 52 protrudes into the sleeve 42. This conductor 52
One end of a so-called tulip contact 56 is locked to the tip of the protruding end. As is well known, the tulip contact 56 is configured by annularly connecting a plurality of conductor contacts 56a having locking claws 58a, 58b at both ends by a coil-shaped spring member 56b. The tulip contact 56 is connected to the conductor 52 by engaging a locking claw 58a at one end thereof with a locking portion 52a formed at the tip of the conductor 52.

A shield tube 60 made of a conductor for adjusting an electric field in the hollow portion extends inside the sleeve 42. A stopper 62 is provided at the tip of the shielding cylinder 60. The stopper 62 receives the tip of the stress cone 64 disposed on the cable 12 for increasing the electrical insulation.

The cable 12 to which the plug 10 is attached is
The plug 18 is inserted from the cable receiving port 46 of the frame 44 into a position such that the neck 18 b of the plug 10 engages with the locking claw 58 b at the other end of the tulip contact 56, and the tip of the stress cone 64 contacts the stopper 62. Touch
In this inserted state, the plug 10 is electrically connected to the conductor 52 via the tulip contact 56, the distance L ₁ extending from the frame 44 in the connected state to the neck portion 18b of the plug 10, for example, specification of a company There is a difference of 5mm between the specifications of other companies. The insertion position of the cable 12 is regulated by a stopper 62 abutting on the tip of the stress cone 64. Therefore, the difference in specifications cannot be adjusted at the insertion position of the cable 12.

Therefore, as the outer plug 18, FIG.
The outer plug 18 having the specification as shown in FIG. 7A and the outer plug 1 having the specification as shown in FIG.
8 are prepared. The two outer plugs 18 differ only in the lengths h ₁ and h _{2 of} the body 18a, and have the same dimensions and shapes as the other parts except the body 18a, ie, the head 18c and the neck 18b. The outer diameter of the hole 18a, the diameter and the depth of the hole 36 are the same.

Accordingly, by selecting the outer plug 18 in accordance with the specification of the connection box 40 and attaching the appropriate outer plug 18 to the inner plug 16, the selected outer plug 1
The locking claw 58b at the other end of the tulip contact 56 can be securely engaged with the neck 18b of the connector 8, so that the single cable 12 can be adapted to both specifications.

Although the case where only the length of the body of the outer plug is different has been described above, the present invention is not limited to this, and the shape and size of the outer plug may be changed according to the specifications of the connection box 40. Can be selected as appropriate.

[0019]

As described above, according to the present invention,
By selecting the outer plug of the size according to the specification and detachably fixing it to the inner plug, it is not necessary to prepare multiple cables different for each specification, and it is possible to adapt to the desired specification . In addition, a space for storing a plurality of outer plugs can be adapted to a plurality of specifications, and a cable for each specification can be made unnecessary. Therefore, the storage space can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a cable terminal structure according to the present invention with a part thereof cut away.

FIG. 2 is a front view showing a conventional cable terminal structure with a part thereof cut away.

FIG. 3 is a front view showing the inner plug according to the present invention with a part thereof cut away.

FIG. 4 is a longitudinal sectional view showing a state in which an inner plug according to the present invention is attached to a cable.

FIG. 5 is a front view showing the elastic contact shown in FIG. 4;

FIG. 6 is a longitudinal sectional view showing a connection box for receiving a cable terminal structure according to the present invention.

FIG. 7 is a front view showing the outer plug according to the present invention with a part thereof cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Cable 14 Conductor end 16 Inner plug 18 Outer plug 18a Trunk 18b Neck 18c Head 22 Resilient contact 36 Hole 40 Connection box

Continuation of front page (56) References JP-A-6-165363 (JP, A) JP-A-7-143653 (JP, A) JP-A-5-184048 (JP, A) JP-A-5-191916 (JP) , A) Japanese Utility Model Showa 56-149521 (JP, U) Japanese Utility Model Showa 58-105735 (JP, U) Japanese Utility Model Showa 4-111232 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) H02G 15/10 H01R 4/48 H02G 15/08

Claims (2)

(57) [Claims] 1. An inner plug that covers a conductor end of a cable and is fixed to the end, and an inner plug that covers the inner plug and is fixed to the inner plug and is replaceable according to the specification of a connection box. A cable terminal structure for a connection box, comprising: an outer plug; and an elastic contact between the outer plug and the inner plug for ensuring electrical contact therebetween. 2. A body provided with a hole that covers an end of a cable and that receives an inner plug fixed to the end of the cable, a neck that follows the body, and a head that follows the neck. A plurality of outer plugs, each of which has the same dimensions of the hole, the neck and the head, and differs only in the length of the body from each other. Outer plug.