JPH0515626U - Rubber, plastic insulated cable end - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] During assembly, the stopper is installed concentrically at a predetermined position on the cable insulator, and the gap between the mold stress cone and the insulating sleeve during power transmission is set. Prevents the occurrence of damage to the cable insulator due to flashover or thermal expansion. [Structure] A cable terminal 22 crimped to an end of a conductor 21 of an insulated cable 20 is connected to a fixed-side conductor via a detachable contactor. A rubber mold stress cone 24 is fitted on the outer periphery of the end of the cable insulator 23, and the cable insulator 23 at the tip of the rubber insulator has a side peripheral surface with the same inclination angle as the tip side tapered surface of the mold stress cone 24. A stopper 25 having a taper is inserted and fitted. Further, an insulation sleeve 26 having a similar taper on the inner peripheral surface is fitted on the outer side of the insulation sleeve 2.
The inner peripheral surface of 6 is in close contact with the taper side peripheral surface of the mold stress cone 24 and the taper side peripheral surface of the sputter 25 connected to the tip side without any gap.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rubber, plastic insulated cable termination.

[0002]

[Prior Art]

 For cable terminations that have been repeatedly assembled and disassembled, such as the terminations of conventional rubber and plastic insulated cables for electric charging, a detachable contact such as a multi-ram band is provided for compactness and workability of conductor connection. An electrical connection is made using the child.

FIG. 3 shows the structure of a slip-on type terminal of such a rubber / plastic insulated cable. In the figure, reference numeral 1 indicates a rubber or plastic insulation cable such as a CV cable (crosslinked polyethylene insulation cable), and a cable terminal 3 is crimped to the end of the conductor 2. The cable terminal 3 is connected to the fixed-side conductor 5 via a detachable contactor 4 such as a multi-ram band. On the other hand, a rubber mold stress cone 7 is fitted around the end of the cable insulator 6. An annular stopper 8 made of fiber reinforced plastic or the like is inserted on the cable insulator 6 at the tip of the mold stress cone 7 to prevent movement of the mold stress cone 7 in the cable length direction. Has been done. Furthermore, an insulating sleeve 9 made of epoxy resin or the like is fitted on the outer side of these so that a part of the inner peripheral surface of the mold stress cone 7 is in close contact with the tip side tapered surface of the mold stress cone 7. Etc. are attached to the bottom plate 10. Furthermore, a push pipe 11 is attached to the rear taper surface (stress cone portion) of the mold stress cone 7, and a push metal fitting 12 and a coiled spring 13 around the push pipe 11 are attached to the rear end of the push pipe 11. The inserted movable shaft 14 is integrally attached. Further, the rear end portion of the movable shaft 14 is in contact with the washer 16 attached to the lower portion of the fixed shaft 15. When the washer 16 is tightened by the nut 17, the coil-shaped spring 13 is pressed and urged, whereby a predetermined surface pressure is applied to the rear taper surface of the mold stress cone 7. In the figure, reference numeral 18 indicates a cable semiconductive layer, and 19 indicates an insulating tube.

Assembling of the rubber and plastic insulation cable end portions is performed as follows. That is, first, the contactor 4 is attached to the fixed-side conductor 5 and the insulating sleeve 9 is fitted on the outer side, and then the cable or terminal 3 is crimped to the inside of the insulating sleeve 9. 1 is inserted and the cable terminal 3 is fitted to the contact 4. Next, the mold stress cone 7 and the stopper 8 which are previously fitted on the cable insulator 6 are pushed up and mounted at a predetermined position. At this time, a lubricant such as silicone grease is applied between the surfaces where the mold stress cone 7 and the stopper 8 come into contact with each other, and the two are bonded together without any gap so that they move integrally. After that, a pressing mechanism including the pressing pipe 11, the movable shaft 14, the coil-shaped spring 13, the washer 16 and the like applies a pressing force in the cable length direction to the mold stress cone 7, and the required assembly is completed.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional rubber and plastic insulated cable terminal portion, the mold stress cone 7 and the stopper 8 are arranged about 10 cm below the predetermined mounting position before assembly, so that the contact 4 The mold stress cone 7 also vibrates at the same time due to the vibration of the cable 1 at the moment when the cable terminal 3 is inserted into. Therefore, as shown in an enlarged view in FIG. 4, the stopper 8 may come off the tip end surface of the mold stress cone 7. When the mold stress cone 7 is pressed in the cable length direction in such a state, a gap is created between the outer peripheral surface of the mold stress cone 7 and the inner peripheral surface of the insulating sleeve 9, and the power transmission is performed. There was a risk of flashover occurring at these interfaces. Also, when the cable terminal 3 is obliquely inserted into the contactor 4 at the time of inserting the cable, the stopper 8 is displaced from the position concentric with the cable insulator 6, and the same as described above. There was an inconvenience. Furthermore, if such an eccentricity of the stopper 8 occurs, as shown in FIG. 5, a part of the inner peripheral surface of the stopper 8 comes into strong contact with the outer peripheral surface of the cable insulator 6. Moreover, since the stopper 8 is sandwiched between the insulating sleeve 9 and the mold stress cone 7 and is hard to move in the radial direction, when the cable insulator 6 is thermally expanded, the stopper 8 is changed due to a change in outer diameter of the insulator. There was a risk that the outer peripheral surface of the cable insulator 6 with which a part of 8 was abutted was damaged.

The present invention has been made to solve these problems. During assembly, the stopper is concentrically mounted at a predetermined position on the cable insulator without being displaced or eccentric. It is an object of the present invention to provide a rubber and plastic insulated cable end portion which has stable and good performance without the risk of a flashover accident during power transmission or damage to the cable insulator due to thermal expansion.

[0007]

[Means for Solving the Problems]

 The rubber and plastic insulated cable terminations of the present invention detachably connect the cable terminal pressed to the conductor end of the cable to the fixed-side conductor through the contactor, and also to the end of the cable insulator. Insert a mold stress cone on the outer circumference, insert an annular stopper on the cable insulator at the tip of the mold stress cone, and make contact with the tip side tapered surface of the mold stress cone on the outside of these. At the end of the rubber or plastic insulation cable with the insulation sleeve fitted over it, the side peripheral surface of the stopper is a tapered surface having the same inclination angle as the tip side tapered surface of the mold stress cone, and The side peripheral surface is a tapered surface continuously formed on the tip side of the inner peripheral tapered surface of the insulating sleeve that contacts the mold stress cone. Characterized by comprising by close contact.

[0008]

[Action]

 In the rubber and plastic insulated cable termination of the present invention, the side peripheral surface of the annular stopper inserted on the cable insulator at the tip of the mold stress cone has the same inclination angle as the tip side tapered surface of this mold stress cone. The portion of the inner peripheral surface of the insulating sleeve that is formed on the tapered surface and that is fitted on the outer side thereof and that engages with the side peripheral surface of the stopper is also formed in a tapered shape having a similar inclination angle. Further, since the tapered side peripheral surface of the stopper is configured to be in close contact with the taper portion of the inner peripheral surface of the insulation sleeve, the stopper is prevented from being displaced or eccentric, and the stopper on the cable insulator is prevented. It is installed correctly in place. That is, even if the stopper is dislocated from the tip surface of the mold stress cone or deviated from the tip surface of the mold stress cone due to tilting or vibration when assembling the cable, the taper on the inner peripheral surface of the insulation sleeve at the specified position on the cable insulator. The parts lead to a concentric wearing state, and the occurrence of displacement is effectively prevented. In this way, a rubber / plastic insulated cable end portion having good performance without occurrence of flashover can be obtained.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of a rubber and plastic insulated cable terminating portion of the present invention. In the figure, reference numeral 20 indicates a rubber or plastic insulated cable such as a CV cable, a cable terminal 22 is crimped to the end of the conductor 21, and the cable terminal 22 is a detachable contactor (not shown). ) To a fixed-side conductor (not shown). A rubber mold stress cone 24 is fitted around the end of the cable insulator 23, and a taper having the same inclination angle as the tip side taper surface of the mold stress cone 24 is fitted on the cable insulator 23 at the tip thereof. An annular stopper 25 having a side peripheral surface provided with is attached. Furthermore, an insulating sleeve 26 having an inner peripheral surface that is tapered at the same inclination angle as the tip side tapered surface of the mold stress cone 24 is fitted on the outside of these, and this insulating sleeve The taper-shaped inner peripheral surface of 26 is in close contact with the tip-side tapered surface of the mold stress cone 24 and the side peripheral surface of the stopper 25 connected thereto without any gap.

In the cable terminating portion of the embodiment configured as described above, the same taper as the tip side taper surface of the mold stress cone 24 is attached to the side peripheral surface of the stopper 25, and the stopper 25 receives the mold stress. Since it is fitted so as to be in close contact with the cone 24 in the insulation sleeve 26 whose inner peripheral surface is tapered with the same inclination angle, it is possible to prevent a predetermined displacement on the cable insulation 23 from occurring without causing displacement or eccentricity. Positioned concentrically in position, it shows stable and good performance.

In the cable terminating portion of the present invention, as shown in FIG. 2, the circular end of the annular stopper 25 is rounded to form a curved surface, so that the positional deviation occurs. And eccentricity can be prevented more effectively. Further, the thickness of the stopper 25 can be made considerably thicker than the conventional one. When such a thick stopper 25 is used, it is impossible to assemble the cable end portion itself if there is a displacement, so the stopper 25 may be mistakenly assembled while the stopper 25 is displaced. Absent.

[0013]

[Effect of the device]

 As described above, in the rubber and plastic insulation cable terminal portion of the present invention, the side peripheral surface of the stopper is formed into a taper shape so as to have the same inclination angle as the taper surface on the tip side of the mold stress cone. On the outside of the stress cone and stopper, an insulating sleeve with a tapered inner peripheral surface is fitted, so that the stopper should be installed at a predetermined position on the cable insulator during assembly. The cable can be fitted concentrically without any deviation or eccentricity, and there is no gap at the interface between the mold stress cone and the insulating sleeve, resulting in a cable end with good performance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of an embodiment of a rubber and plastic insulated cable end portion of the present invention.

FIG. 2 is a vertical cross-sectional view showing another example of a stopper used for the rubber and plastic insulation cable end portion of the present invention.

FIG. 3 is a vertical cross-sectional view showing a structure of a slip-on type terminal portion of a conventional rubber / plastic insulated cable.

FIG. 4 is a vertical cross-sectional view schematically showing a state where a stopper is displaced in a conventional rubber and plastic insulated cable terminal portion.

FIG. 5 is a view schematically showing a positional relationship between a stopper and a cable insulator in which a positional deviation has occurred in a conventional rubber and plastic insulated cable terminal portion.

[Explanation of symbols]

 1, 20 ………… Rubber and plastic insulation cable 2, 21 ………… Cable conductor 3, 22 …… Cable terminal 4 ………… Contactor 5 ………… Fixed side conductor 6, 23 ………… Cable insulator 7, 24 ……… Mold stress cone 8, 25 ……… Stopper 9, 26 ……… Insulation sleeve 10 …… Equipment bottom plate 11 ……… Push pipe 12 ……… Push metal fitting 13 ……… Coil spring 14 …… … Movable shaft 16 ………… Washer 18 …… Cable semi-conductive layer.

Claims (1)

[Scope of utility model registration request] 1. A cable terminal crimped to a conductor end of a cable is detachably connected to a fixed-side conductor via a contactor, and a mold stress cone is fitted around the end of the cable insulator. Also, a rubber is obtained by inserting an annular stopper on the cable insulator at the tip of the mold stress cone, and by fitting an insulating sleeve on the outside of the stopper so as to make contact with the taper surface on the tip side of the mold stress cone. In the end portion of the plastic insulation cable, the side peripheral surface of the stopper is a taper surface having the same inclination angle as the tip side taper surface of the mold stress cone, and the side peripheral surface is the mold stress of the insulation sleeve. A rubber, which is characterized by being closely contacted with a tapered surface continuously formed on the tip side of the inner peripheral tapered surface in contact with the cone. The end of the plastic insulated cable.