JPH07101620B2 - How to connect rubber / plastic insulated power cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a method for connecting a rubber / plastic insulated power cable.

[Prior Art] When connecting a rubber / plastic insulated power cable,
A cable connector in which a conductor connector is provided in an insulating reinforcing body having a cable terminal insertion hole is sometimes used. In this cable connection method, when the cable connector is shared by cables of various conductor sizes, an insulating spacer for diameter matching is interposed between the cable terminal insertion hole of the cable connector and the cable terminal.

[Problems to be Solved by the Invention] However, according to the method of using the diameter-matching insulating spacer, between the cable terminal insulating layer and the insulating spacer and between the cable terminal insertion hole of the cable connector and the insulating spacer, respectively. There will be a contact interface,
Compared to the normal case (when no insulating spacer is used, that is, when there is a contact interface only between the cable end insertion hole of the cable connector and the cable end insulating layer), the number and area of contact interfaces increase. , Is disadvantageous in terms of insulation strength.

An object of the present invention is to provide a method for connecting a rubber / plastic insulated power cable, which enables a cable connector to be commonly used for rubber / plastic insulated power cables of various conductor sizes without using an insulating spacer for diameter matching.

[Means for Solving the Problems] The present invention for achieving the above object is to provide a rubber having various conductor sizes in the cable terminal insertion hole of the common cable connector in which the conductor connector is provided in the rubber insulation reinforcing body having the cable terminal insertion hole. -In the method of press-fitting a plastic insulated cable terminal to connect a cable, while forming the rubber insulation reinforcement body sufficiently softer than the insulation layer of the cable,
After cutting the outer surface of the insulating layer to the extent that the outer diameter of the insulating layer at least at the tip of the cable terminal portion press-fitted into the cable terminal insertion hole is slightly larger than the inner diameter of the cylindrical cable terminal insertion hole. The cable terminal is press-fitted into the cable terminal insertion hole.

[Examples] The present invention will be described below with reference to the drawings of the examples.

FIG. 1 shows a cable connector A used in the present invention.

In FIG. 1, 11 is a plug-in type conductor connector, and a protrusion 12 is provided at the center of the outer surface. Reference numeral 13 denotes an internal shield electrode, which is molded from conductive rubber / plastic (for example, semiconductive ethylene / propylene rubber, semiconductive polyethylene, etc.) and has the protrusion 12 of the conductor connector 11 embedded therein. Reference numeral 14 is a rubber insulating reinforcing member made of ethylene / propylene rubber, silicon rubber, neoprene rubber, or the like, and is a cylindrical cable terminal insertion hole 15 which buries and fixes the shield electrode 13 and reaches the conductor connector 11 from both ends. Is provided. Reference numeral 16 denotes an outer shield layer provided on the outer surface of the rubber insulating reinforcement 14, which is made of a conductive material (for example, conductive ethylene / propylene rubber, silicone rubber, neoprene rubber, etc.).

The rubber insulating reinforcement 14 and the outer shield layer 16 described above,
Use a material that is sufficiently softer than the constituent material of the rubber / plastic insulation layer of the cable to be connected.

In order to connect a rubber / plastic insulated power cable according to the present invention, first, as shown in FIG. 2A, the outer surface of the rubber / plastic insulating layer 21 of the cable terminal B is cut to determine the outer diameter of the insulating layer as a cable connector. The plug type conductor connector C is compression-connected to the cable conductor 22 by approaching the inner diameter of the cylindrical cable end insertion hole 15 of A. Then, as shown in FIG. 2B, the above-mentioned machined cable end is press-fitted into the cable end insertion hole 15 of the cable connector A, and the plug-type conductor connector C is attached to the conductor connector 11 in the connector A. Plug in and terminate the connection of cables W and W.

In this case, the cutting outer diameter of the cable terminal insulating layer is about 10 to 20% larger than the inner diameter of the cable terminal insertion hole of the cable connector. Since the insulating reinforcing body 14 and the outer shield layer 16 are made sufficiently softer than the cable insulating layer 21, press fitting of the cable end into the cable connector is very easy. Moreover, since a considerable contact pressure can be applied between the cable terminal insulating layer and the cable terminal insertion hole, the insulation strength of the contact interface can be well ensured.

In the above embodiment, the cable insulating layer of almost the entire length of the cable end is machined, but as shown in FIG. 3, only the tip end portion 150 of the cable end portion which is press-fitted into the cable end insertion hole is provided with the cable. The outer surface of the insulating layer may be cut. In this case, the press-fitting of the cable end into the cable end insertion hole is not so easy as in the case shown in FIGS. 2A and 2B, but the labor of the outer surface cutting of the cable insulating layer can be significantly reduced.

Further, as shown in FIG. 4, the outer surface of the cable insulating layer of the cable end B is machined into a substantially uniform tapered surface, which is press-fitted into a cylindrical cable end insertion hole, and the press-fitted cable end and the cable end are You may form so that the interface with an insertion hole may make a taper surface.

[Effect of the Invention] The method for connecting a rubber / plastic insulated power cable according to the present invention is the method as described above, and is formed to be sufficiently softer than the insulating layer of the cable for connecting the rubber insulating reinforcement of the connector, The outer surface of the insulating layer was cut so that the outer diameter of the insulating layer was slightly larger than the inner diameter of the cylindrical cable terminal insertion hole at least at the tip of the portion of the rubber / plastic insulated cable terminal that was press-fitted into the cable terminal insertion hole. Since the cable end is press-fitted into the cable end insertion hole of the cable connector, press-fitting of the cable end becomes easy, and a considerable contact pressure acts between the cable end insulating layer and the cable end insertion hole. Therefore, the insulation strength of the contact interface can be well ensured. That is, according to the present invention, the cable connector can be commonly used for connecting rubber / plastic insulated power cables of various conductor sizes without using an insulating spacer for diameter matching. There is only one contact interface between the cable end insertion hole of the cable connector and the cable end insulation layer (when using the matching insulating spacer, there are two contact interfaces), which is advantageous in terms of insulation strength. is there.

Further, since the rubber insulation reinforcing member is formed to be sufficiently softer than the cable insulating layer, not only the cable terminal can be easily press-fitted, but also the cable terminal into which the outer surface of the insulating layer of the cable terminal is cut. There is also an advantage that the labor and time required for connection can be reduced because it can be stopped only at the tip portion instead of the entire length.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cable connector used in the present invention, FIG. 2A is an explanatory view showing a cutting state of a cable insulating layer of a cable terminal in the present invention, and FIG. 2B is a cable connection connected by the present invention. FIGS. 3A and 3B and FIG. 4 are explanatory views showing another embodiment of the present invention. In the figure, A is a cable connector, 11 is a conductor connector,
14 is a rubber insulating reinforcement, 15 is a cable terminal insertion hole, B is a cable terminal, and 21 is a cable insulating layer of the cable terminal.

Front page continuation (72) Inventor Juzo Shimomura 1008 Shinbori, Kumagaya-shi, Saitama Mitsubishi Cable Industries, Ltd. Kumagaya Manufacturing Co., Ltd. (72) Inventor Shigeru Owada 1008 Shinbori, Kumagaya, Saitama Mitsubishi Cable Industries Co., Ltd. 56) Bibliography Shou 57-1408 (JP, U)

Claims (1)

[Claims] 1. A cable is connected by press-fitting rubber / plastic insulated cable terminals of various conductor sizes into the cable terminal insertion hole of a shared cable connector having a conductor connector provided in a rubber insulation reinforcement body having a cable terminal insertion hole. In the method, the rubber insulation reinforcement is formed to be sufficiently softer than the insulation layer of the cable, and the outer diameter of the insulation layer at least at the tip of the cable end portion press-fitted into the cable end insertion hole is cylindrical. A method for connecting a rubber / plastic insulated power cable, characterized by cutting the outer surface of the insulating layer to a size slightly larger than the inner diameter of the cable terminal insertion hole and then press-fitting the cable terminal into the cable terminal insertion hole.