JP2579117Y2 - Cable termination - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a cable terminal portion useful for connecting between connection terminals of a propulsion coil for a linear motor car, for example.

(Prior Art) In general, a linear motor car is provided with propulsive force by three-phase (U-phase, V-phase, and W-phase) propulsion coils arranged along both sides of a track along a length direction. By the way, as shown in FIG. 3, such a three-phase propulsion coil is provided on a panel 1 arranged on both sides of a track (not shown) along the length direction.
It is buried periodically in the order of U-phase, V-phase and W-phase along the length direction of the track. Of these propulsion coils (not shown), connectors between the connection terminals 2 of the same-phase propulsion coil are connected at both ends. 3
Are electrically connected by a cable 4 having

Conventionally, as the connector 3 formed at the terminal portion of such a cable 4, as shown in FIG. 4, an insulating tube 6 having an L-shape as a whole and formed on the inner and outer circumferences of the insulating tube 6. An inner semiconductive layer 7 and an outer semiconductive layer 8 are formed. On one side, an insertion hole 10 of the cable core 9 is formed, and on the other side, a trumpet-shaped receiving port 12 for receiving the connected body 11 is formed. What has been devised has been devised. In the drawing, reference numeral 13 denotes a conductor terminal connected to the tip of the conductor 14 of the cable 4, and reference numeral 15 denotes a plug screwed into a screw hole of the conductor terminal 13.

(Problem to be Solved by the Invention) By the way, such a conventional connector 3 includes an insulating cylinder 6
After inserting the cable core 9 into the plug, the plug 15
13 is screwed into the screw hole 13a, the portion 15a penetrating the internal semiconductive layer 7 of the plug 15 is round bar-shaped, and the plug insertion hole is formed slightly smaller in diameter than this round bar portion. Therefore, the air existing in the plug insertion hole of the internal semiconductive layer 7 is press-fitted into the insertion hole of the conductor terminal 13 on the cable core 9 side, and the space that has entered between the cable core 9 and the insertion hole 10 with time. Is formed to cause a decrease in withstand voltage characteristics.

Further, in such a connector 3, since the rising portion 16 of the external semiconductive layer 8 has a linear slope, in order to reduce the electric field at the end of the shield layer 17 of the cable, the external semiconductive layer 8 is required. It is necessary to make the straight slopes 8 long enough. However, the longer the linear slope of the external semiconductive layer 8 is, the longer the connector 3 is, and the longer the cable end is, and the more difficult the electrical connection between the connection terminals 2 of the propulsion coil becomes. There is.

The present invention has been made based on the above circumstances, and does not reduce the withstand voltage by forming a gap between the cable core and the insertion hole, and furthermore, reduces the length of the connector to reduce the size of the cable end portion. It is intended to provide a cable termination that can be obtained.

[Configuration of the Invention] (Means for Solving the Problems) The cable terminal portion of the present invention has a substantially L-shape as a whole, and one end of the L-shape has a conductor terminal insertion hole at the back. A connector, in which an insertion hole is formed and a receiving hole of a connected object having a plug insertion hole communicating with the conductor terminal insertion hole formed in the center of the back of the other arm portion, is formed through the conductor terminal insertion hole. The inner part and the inner semiconductive part in the vicinity of the insertion hole are made of semiconductive rubber, the insulating part of the outer part is made of insulating rubber, and the L-shaped both ends of the insulating part have a bell mouth inner surface shape. Each is formed, the outermost surface is covered with semiconductive rubber to form bell mouths at both ends of the L-shape, and the cable conductor and the cable shielding layer are peeled off in the cable insertion hole of the connector. Exposed to the cable conductor tip The end of the cable in which the conductor terminal having the screw hole orthogonal to the wire is compression-connected, the screw hole faces the plug insertion hole of the connector, and the cable shielding layer contacts the small diameter portion of the bell mouth of the connector. In the plug insertion hole of the receiving port, a screw portion is formed at one end and a pin-shaped portion is formed at the other end, and the outer periphery of the remaining central portion has a larger diameter than the screw portion and the pin-shaped portion. A plug formed into a polygonal shape is inserted so that the polygonal portion comes into contact with the internal semiconductive portion inside the plug insertion hole with the screw portion first, and screwed into the screw hole at the tip of the conductor terminal. It is characterized by becoming.

(Operation) In the cable terminal portion having the above configuration, the plug has a structure in which a screw portion is formed at one end and a pin-shaped portion is formed at the other end, and the outer periphery of the remaining central portion is formed in a square shape.
When inserting the cable core into the connector and then inserting the plug into the plug insertion hole while rotating the plug, air in the plug insertion hole is formed on the flat part that forms the square part of the plug central part and on the inner surface of the plug insertion hole Since the air escapes from the gap, the pressurized air does not remain on the cable insertion hole side. Therefore, a gap is formed between the cable core and the insertion hole, so that there is no danger of lowering the withstand voltage.

In addition, since the electric field at the end of the cable shielding layer is sufficiently reduced by the short bell mouth, the length of the connector can be reduced, and the end of the cable can be reduced in size.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing a connection state between connection terminals of a propulsion coil, and FIG. 2 is a longitudinal sectional view of a cable terminal portion according to an embodiment of the present invention. In these figures, the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals.

In FIG. 1, reference numeral 1 denotes a panel made of concrete or the like arranged along the length direction on both sides of a track (not shown). The panel 1 includes a propulsion coil made of an aluminum flat wire or the like. 5 is a linear motor car (not shown)
Are buried periodically in the order of U-phase, V-phase, and W-phase along the traveling direction. These propulsion coils 5 are electrically connected between the same phases by a cable made of, for example, a 33 kV class crosslinked polyethylene insulated cable. Similarly, the in-phase propulsion coils 5 buried in the adjacent panels 1 are also electrically connected to each other by the cables 4 jumpered to the joints of the panels 1.

In the figure, reference numeral 2 denotes a connection terminal of the propulsion coil 5, and reference numeral 3 denotes a connector.

Next, the connection between the cable 4 and the connection terminal 2 of the propulsion coil 5 will be described with reference to FIG.

In the figure, a connector 3 includes an insulating cylinder 6 'made of EP rubber or the like having an L-shape as a whole, and an insulating cylinder 6'
An inner semiconductive layer 7 'made of semiconductive EP rubber or the like formed on the inner periphery of the outer cylinder, and an outer semiconductive layer 8' made of semiconductive EP rubber or the like formed on the outer periphery of the insulating cylinder 6 '. The insertion hole 10 of the cable core 9 is provided on one side of the connector 3.
On the other side, a connected body 11 such as a connection terminal 2 of a propulsion coil is provided.
Are formed respectively.

It is desirable that the inner semiconductive ends 7a and 7b of the inner semiconductive layer 7 'be buried in the insulating cylinder 6'. Internal semiconductive end
When the outer surfaces of 7a and 7b are covered with an insulating member, the insertion hole 10 and the cable core 9 or the receiving port 12 and the connection target 11
Since the concentration of the electric field on the interface of the high-voltage portion can be reduced, the flashing distance between the high-voltage portion and the ground portion can be shortened, and the entire connector can be further shortened.

Reference numeral 16 'denotes a bell mouth made of semiconductive EP rubber or the like integrally molded around an insulating cylinder 6' functioning as an insertion hole 10 of the cable core 9. The small diameter portion 19 contacts the outer periphery of the shielding layer 17 of the cable core 9 as follows. That is, first, the terminal of the cable 4 is peeled off to expose the conductor 14, the cable core 9, and the shielding layer 17, respectively. Then, the conductor terminal 13 having a threaded hole 20 formed at the tip thereof so as to be orthogonal to the axis is compression-connected to the exposed conductor 14. Thus, in the insertion hole 10 of the connector 3, the cable core 9 is surrounded by the conductor terminal 13 by the inner semiconductive layer 7 ', and the bell mouth 1
The 6 'small-diameter portion 19 side is tightly fitted to a position where the small-diameter portion 19 closely contacts the outer periphery of the shielding layer 17 of the cable core 9.

Next, the connection between the connected object 11 such as the connection terminal 2 of the propulsion coil 5 and the connector 3 will be described. The plug 15 is screwed onto the conductor terminal 13 after the cable core 9 is inserted into the insertion hole 10.

First, for example, in the screw hole 20 of the conductor terminal 13, for example, a pin-shaped portion 21, a square portion 22 connected to the pin-shaped portion 21, and a screw portion 23 connected to the square-shaped portion 22.
The screw portion 23 of the plug 15 is screwed. At this time,
The plug 15 is inserted while rotating the angular portion 22 with a wrench or the like into the insertion hole 7a. The insertion hole 7c is in the square portion 22 of the plug 15.
Although the diameter is slightly smaller than the maximum diameter of the insertion hole 7c, a gap is formed between the flat portion forming the angular portion 22 and the inner surface of the insertion hole 7c, so that the air in the insertion hole 7c As it goes, it is discharged to the outside from this gap.

On the other hand, the connected body 11 is formed in a spindle shape by an epoxy mold or the like, and a conductive lead rod 24 made of a copper rod, an aluminum rod, or the like is buried in the center thereof. A plug insertion hole 25 is formed at an end of the outlet rod 24, and a band-shaped conductive connection made of a multi-ram band or the like is formed in an annular groove formed on the inner periphery of the plug insertion hole 25. A child 26 is annularly fitted along the groove.

Thus, the pin-shaped portion 21 of the plug 15 is plugged into the plug insertion hole 25 of the outlet rod 24 of the epoxy mold, and the soft connector 3 is attached to the outer periphery of the cone-shaped portion 27 of the hard connected body 11. By tightly fitting the trumpet-shaped part 12 of
The connection terminals 2 of the propulsion coil 5 are electrically connected by the cable 4.

In the figure, reference numeral 28 denotes a semiconductive tape wound between the bell mouth 16 'and the cable shielding layer, 29 denotes a protective tape wound on the winding layer of the semiconductive tape, 30 denotes a ground wire, and 31 denotes a ground wire. 5 shows a semiconductive ring formed on the inner periphery of the inner semiconductive layer and in contact with the outer periphery of the conductor terminal.

In the above-described embodiment, the propulsion coil for the linear motor car is used as the object to be connected. However, any device may be used as long as the electrode exists at the tip of the object.

In the cable terminal portion of the present invention having the above-described structure, pressurized air does not remain in the cable insertion hole, and a bell mouth is disposed around the insertion hole of the cable core of the connector. Since the electric field at the end of the shielding layer can be sufficiently reduced, the size of the connector can be reduced, and the entire cable terminal can be reduced in size.

[Effects of the Invention] As is clear from the above, according to the cable terminal portion of the present invention, the plug has a threaded portion at one end and a pin-shaped portion at the other end, and the outer periphery of the remaining central portion is square. Because of this structure, the pressurized air does not remain on the cable insertion hole side, and the withstand voltage does not decrease between the cable core and the insertion hole. In addition, since the electric field at the end of the cable shielding layer is sufficiently reduced by the short bell mouth, the length of the connector can be reduced, and the end of the cable can be reduced in size.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a connection state between connection terminals of a propulsion coil, FIG. 2 is a longitudinal sectional view of a cable terminal portion according to an embodiment of the present invention, and FIG. 3 is a jumper connection to a panel connection portion. FIG. 4 is an explanatory diagram showing a connection state between a cable and a connected object. FIG. 4 is a longitudinal sectional view of a conventional cable terminal portion. DESCRIPTION OF SYMBOLS 1 ... Panel 2 ... Connection terminal 3 ... Connector 4 ... Cable 5 ... Propulsion coil 6, 6 '... Insulating cylinder 7, 7' ... Inner semiconductive layer 8, 8 '... Outer semiconductive layer 9 Cable core 10 Insert hole 11 Connected body 12 Receptacle 13 Conductor terminal 14 Conductor 15 Plug 16 Bellmouth 17 Cable shielding layer 19 Small diameter part

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Naoya Hasegawa 1-1-1, Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Showa Electric Wire & Cable Co., Ltd. Japanese Utility Model Application 63-4630 (JP, U) Japanese Utility Model Application Hei 2-49320 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02G 15/00

Claims (1)

(57) [Scope of request for utility model registration] A cable insertion hole is formed in one of the L-shaped arms so that a back portion is a conductor terminal insertion hole, and the other arm portion has the conductor in the center of the back portion. A connector formed with a receiving hole of a connected body having a plug insertion hole communicating with the terminal insertion hole is formed by semi-conducting an inner portion extending from the conductor terminal insertion hole to the plug insertion hole and an internal semiconductive portion in the vicinity thereof. The outer portion of the insulating portion is made of rubber, and the L-shaped both ends of the insulating portion are formed to have bell-mouth inner surface shapes, and the entire outermost surface is covered with semiconductive rubber. A conductor terminal having bell-mouths formed at both ends of an L-shape and having a screw hole perpendicular to an axis at a tip end of the cable conductor by exposing the cable conductor and the cable shielding layer in the cable insertion hole of the connector to expose the cable conductor and the cable shielding layer Cable with compression connection An end is inserted so that the screw hole faces a plug insertion hole of the connector and the cable shielding layer contacts a small-diameter portion of a bell mouth of the connector. A plug formed by forming a threaded portion at the other end and a pin-shaped portion at the other end, and forming the outer periphery of the remaining central portion into a polygonal shape having a larger diameter than the threaded portion and the pin-shaped portion, A cable termination portion, wherein the polygonal portion is inserted into contact with the internal semiconductive portion inside the plug insertion hole and screwed into a screw hole at the tip of the conductor terminal.