JPH0126247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power cable connection, and more particularly,
The present invention relates to a connection part of this type in which a shield electrode fitting is attached to the outside of a conductor connecting fitting provided between the conductor terminals of both power cables to be connected for shielding the fitting.

Fig. 1 shows a cross section of the main parts of a conventional power cable connection part of this type, in which 1 indicates a shield electrode fitting;
2 is a conductor connecting fitting, 3 is an epoxy unit, 4 is a fixing fitting, 5 is an O-ring, 6 is a threaded part of the fixing fitting 4, 7 is a fitting part of both the shield and conductor connecting fittings, 8
9 is the contact portion of both the fixing and conductor connection fittings, and 9 is the cable. The shield electrode fitting 1 for electrically shielding the electrically most important conductor connecting fitting 2 among the connecting parts of a power cable having such various parts is as follows:
It is embedded in the epoxy unit 3.

However, the conductor connection fitting 2 and the shield electrode fitting 1
This depends on the contact part 8 via the fixing metal fitting 4 screwed to the shield electrode metal fitting 1 and the contact at the fitting part 7 between the two, but if the contact is not made securely, the relationship between the two This could lead to electrical discharge, which could eventually deteriorate the insulation and lead to serious accidents such as dielectric breakdown.

Therefore, in the past, in order to ensure electrical connection between the conductor connection fitting and the shield electrode fitting,
A structure as shown in FIG. 3 or 3 has been adopted, but both had problems in the workability of the electrical connection between the conductor connection and the shield electrode metal fittings. (The same structures and operating parts as in FIG. 1 are given the same reference numerals as in the same figure.) In other words, in the example of FIG. A bonding wire 10 is used to connect the two sides of the
On the other hand, in the case shown in FIG. 3, a groove is formed on the surface of one of the conductor connection fittings constituting the fitting part 7, and a metal piece contact 11 is fixed with a screw within the groove, and the pointed head of the contact These bonding operations are often carried out near the final stage of assembly due to the structure of the connection, and epoxy insulators and other structures may be in contact with the surface of the mating metal fitting 1. This makes it difficult to tighten the screws to connect the bonding wire 10 to both the conductor connection and the shield electrode metal fittings, and the reliability of the electrical connection is affected because the screws become loose and the number of contact points cannot be increased. In some respects, it could not be said that everything was perfect.

Therefore, an important issue is the development of a device that can perform a reliable electrical connection between the conductor connection and the shield electrode metal fittings, without any operational changes from the conventional one (Fig. 1), and without affecting other performance. Ta.

In order to satisfy the last objective, the present invention provides a power cable of this kind that can securely electrically connect both the conductor connection and the shield electrode metal fittings, and also make it possible to perform the connection operation for this purpose incidentally. The purpose is to provide a connection for

That is, as shown in the attached drawings, the connecting portion of the power cable of the present invention is connected to either the outer circumferential surface of the conductor connection fittings 2 or the inner circumferential surface of the shield electrode fitting 1, which face each other so as to fit into each other. A ladder-shaped mounting groove 13 with an enlarged depth is recessed on the circumferential surface, and the mounting groove 13
A large number of contact pieces are formed by punching out an elastic metal plate at a predetermined interval between them, leaving both side edges, and forming a plurality of contact pieces. A current-carrying contact 12, which is shaped to stand obliquely in the plate thickness direction by twisting the piece, is attached to the inner bottom surface of the mounting groove 13 and a mating metal fitting facing the mounting groove. Both metal fittings 1 and 2 are in elastic contact with the peripheral surface of the metal fittings 1 and 2.
It is something that intervenes in between.

In the above, the current-carrying contact 12 is made of a conductive and elastic metal plate such as beryllium bronze, and its specific shape is shown in FIGS. 7 and 8.
As shown in the figure, a large number of contact pieces 122, 122, . The contactor 12 shaped like this is twisted to stand up obliquely in the plate thickness direction. Both side edges 121, 121 are locked in the ladder-shaped mounting groove 13, which has a narrower opening and is enlarged at the back.In this mounted state, the contact piece 122
One side edge 122a of the contact piece is in elastic contact with the inner bottom surface of the mounting groove 13, and the other side edge 122b of the contact piece is positioned so as to protrude to the outside through the opening of the attachment groove 13, and the protruding side edge 122b This serves as a portion that provides elastic contact with the fitting circumferential surface of the mating member to be contacted.

FIG. 4 is a cross-sectional explanatory view showing an embodiment of the power cable connection part of the present invention, which is constructed by applying the current-carrying contact 12 having the shape and mounting structure as described above, and FIG. It is a cross-sectional explanatory view taken along the line AA' in the same figure as above.

In this embodiment, in the fitting part 7 between the conductor connection fitting 2 and the shield electrode fitting 1, a ladder-shaped mounting groove 13 with an enlarged depth is formed on the outer peripheral surface of the conductor connection fitting 2. The above-mentioned current-carrying contact 12 is attached to this attachment groove 13 with both side edges 121, 121 of the contactor 12 being engaged with the shoulders of the groove. Therefore, the current-carrying contact 12 is attached so as to surround the conductor connection fitting 2 in a ring shape along the groove extending around the outer periphery.

A large number of contact pieces 12 are held in an obliquely upright state by the engagement of the grooves on both side edges 121, 121.
2, 122 . , so that it can come into elastic contact with the inner circumferential surface of the shield electrode fitting 1 on the other side.
In other words, the shield electrode fitting 1 is inserted into the conductor connecting fitting 2 from the left side to the right side in the drawing, and the fitted state 7
When forming the shield electrode fitting 1, the inner circumferential surface of the shield electrode fitting 1 slides on the protruding side edge 122b of the contact piece 122 in a pressed state to achieve a predetermined fitting 7, and at the same time, the inner circumferential surface of the shield electrode fitting 1 is pressed. When the contact piece 122 that has been contacted is displaced to change its upright angle due to its own elastic deformation, elastic force is accumulated in the contact piece 122, and as a result, the contact piece 122 moves into the mounting groove of the conductor connection fitting 2. This provides good contact pressure to the inner bottom surface of the shield electrode fitting 1 and the inner circumferential surface of the shield electrode fitting 1, and ensures reliable electrical connection (bonding) between the conductor connection and the shield electrode fitting.

FIG. 6 shows an example in which a mounting groove 13 similar to that described above is provided on the inner circumferential surface of the shield electrode fitting 1, and a current-carrying contact 12 is fixedly attached thereto. It will be easily understood that the contact behavior in this example is the same as in the above-described embodiment, except that the current-carrying contact 12 is attached to the shield electrode fitting 1 side.

As is clear from the above two embodiments, the electrical connection between the conductor connection and shield electrode metal fittings of the present invention is achieved by a current-carrying contact that is pre-attached to one of the inner and outer circumferential surfaces where they fit together. This is accomplished in conjunction with the fitting operation of the two metal fittings, so it can be done in the same manner as the conventional method (the one in Figure 1) without any additional connection work for electrically connecting the two metal fittings. It becomes possible to assemble.

As explained above, according to the power cable connection part of the present invention, it is possible to reliably electrically connect both the conductor connection and the shield electrode fittings, and also to perform the connection operation for that purpose incidentally. The intended purpose was fully achieved and the practical effects were great.

[Brief explanation of drawings]

1 to 3 are main part cross-sectional explanatory diagrams showing an example of the structure of a connecting part of a conventional power cable, and FIG. Fig. 5 is an explanatory cross-sectional view taken along line A-A' in the same figure as above, Fig. 6 is an explanatory cross-sectional view of main parts showing another embodiment of the power cable connection part according to the present invention, and Fig. 7 is an explanatory cross-sectional view of the main part used in the present invention. FIG. 8 is a perspective explanatory view showing an example of a current-carrying contact; FIG. 8 is a perspective view illustrating a state in which the current-carrying contact is attached. In the figure, 1 is a shield electrode metal fitting, 2 is a conductor connection metal fitting, 7 is a fitting part, 9 is a cable, 12 is a current-carrying contact, and 13 is a mounting groove.

Claims (1)

[Claims] 1. Both power cables to be connected are connected to each other at the connecting part of the power cable, which has a conductor connecting fitting provided between the conductor terminals and a shield electrode fitting attached to the outside of the conductor connecting fitting so as to shield the fitting. A ladder-shaped mounting groove with an enlarged depth is recessed on either the outer circumferential surface of the conductor connection fittings or the inner circumferential surface of the shield electrode fitting, which face each other so as to fit into each other. , a large number of contact pieces are formed by punching out an elastic metal plate, which is fixed by inserting the plate with a width larger than the width of the opening, at predetermined intervals, leaving both side edges of the plate, and twisting the contact pieces. In fact, a current-carrying contact that is shaped to stand obliquely in the thickness direction of the plate is connected so that its contact piece is on the inner bottom surface of the mounting groove and on the circumferential surface of the mating metal fitting that faces the mounting groove. A power cable connection section characterized by being interposed between the two metal fittings in a state of elastic contact.