JPH028512Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a power cable connecting portion in which an elastic cylindrical body is inserted into the connecting portion. [Prior Art] As shown in FIG. 4, the conventional rubber/plastic insulated power cable connection part has an elastic rubber insulating tube 13 molded in a factory on one cable side of both cable terminal parts to which it is to be connected. The terminals of each cable are covered with cylindrical elastic insulating spacers 12, 12, and the conductors 15, 15 of both cables are connected using sleeves, wedge-tight connectors, etc. Cover the connector cover such as the conductive sleeve cover 14 with a split, and apply silicone grease to the mating contact surface of the elastic rubber insulating tube 13 fitted on one cable side and the insulating spacers 12, 12. Pull the rubber insulating cylinder 13 onto the connection part and attach the insulating spacer 1
2, 12, which fit onto the sleeve cover 14 to form a connection part. These rubber insulating tube plug-in type connections are assembled with factory-processed rubber insulating tubes, so they have better workability and insulation properties than insulating tape-wrapped connections, making them suitable for high-voltage cable connection work. be. [Problems to be solved by the invention] However, in the conventional connection part, when fitting the rubber insulating cylinder onto the connection part, there is variation in the fitting performance of the rubber insulating cylinder even if the connection part has the same shape. In some cases, it is possible to fit the parts by one person, but in other cases, it is difficult to do the fitting work even if two people work together. For this reason, the diameter of the rubber insulating tube processed in the factory must be finished with high precision so that it can fit tightly into the cable connection part, and there is the problem that it is difficult to obtain good electrical characteristics of the connection part. It was hot. The same is true when assembling a rubber stress cone onto the insulation of a CV cable. The cause of the poor fitting of the rubber insulating tube described above is that even if silicone grease is applied to the contact interface between the elastic rubber insulating tube 13 and the insulating spacer 12, when the rubber insulating tube 13 is pulled over the connection part and fitted together, , corners e, f of the insulating spacer 12, sleeve cover 14, etc.
It was found that this was because the silicone grease was scraped off by g, h, etc., and the slipperiness during fitting was lost. The object of the present invention is to obtain a good connection by making it possible to smoothly fit an elastic cylindrical body in the assembly work of a power cable connection. [Means for Solving the Problems] In order to achieve the above object, the power cable connection part of the present invention includes an elastic cylindrical body (elastic insulating spacer 1, elastic rubber insulating cylinder 3, elastic rubber stress) in the cable connection part. At the connecting part where the cone 9, etc.) are fitted and assembled, a circular curved surface part (a, b, d, etc.) for preventing the lubricant from being scraped off is formed at the corner of the end of the elastic cylindrical body, and this elastic The fitting contact surface of the cylindrical body is coated with a lubricant (silicon grease, etc.) and the cylindrical body is fitted into the connecting portion. [Operation] The above-mentioned elastic cylindrical body is pre-processed in a factory and assembled by fitting into a connecting portion at a cable connecting work site. The lubricant applied to the fitting contact surface of the elastic cylindrical body makes it slippery when closely fitting onto the cable connection part, thereby making the fitting operation smooth. The curved surface part formed at the corner of the end of the elastic cylindrical body to prevent lubricant from scraping off is useful when closely fitting the elastic cylindrical body whose mating contact surface is coated with lubricant onto the cable connection part. Secondly, it prevents the lubricant from being scraped off at the corner of the end of the elastic cylindrical body, thereby preventing the loss of slipperiness during fitting, thereby improving the fitting operation of the elastic cylindrical body. The process becomes smoother and a power cable connection with good electrical characteristics can be obtained. [Examples] Examples of the present invention will be described below with reference to the drawings. In the embodiment shown in the first figure, the elastic cylindrical bodies 1, 1
is an elastic insulating spacer placed over both cable terminals to be connected, and the elastic cylindrical body 3 is an elastic rubber insulating tube that fits onto this insulating spacer, and this elastic cylindrical body is pre-molded at a factory. a and b are the elastic cylindrical body 1 of this insulating spacer
This is a circular curved surface part provided at the corner of the outer surface to prevent lubricant from being scraped off. Reference numeral 2 denotes a tapered surface formed to be continuous with the circularly curved surface portions a and b. 6 is a conductor connecting tube that is placed over the connecting portion of both cable conductors of both cable terminal portions 7, 7 to be connected;
Reference numeral 8 denotes a conductive sleeve cover that covers the outer periphery. This sleeve cover 8 is also provided with a circularly curved surface part c for preventing the lubricant from being scraped off at the corner of its outer surface, and a tapered surface 2 is formed in a continuous manner with this circularly curved surface part c. The elastic cylindrical body 3, which is an elastic rubber insulating cylinder, has an inner semiconducting layer 4 on its inner peripheral surface and an outer semiconducting layer 5 on its outer peripheral surface, and h is an end of the outer semiconducting layer 5. A lubricant such as silicone grease is applied to the inner peripheral surface of the rubber insulating cylinder of this elastic cylindrical body 3.
The cable end portions 7, 7 to be connected are brought closer to one cable side and inserted. Furthermore, a lubricant such as silicone grease is applied to the outer peripheral surface of the elastic cylindrical body 1 of the insulating spacer to insulate the elastic cylindrical body 3 of the elastic rubber insulating tube that is placed toward one of the cables. The elastic cylindrical bodies 1, 1 of the spacer and the sleeve cover 8 are pulled together and tightly fitted to form a cable connection section. In this way, the corners of the ends of the elastic cylindrical bodies 1, 1 of the insulating spacer and the elastic cylindrical body 3 of the elastic rubber insulating cylinder are formed into circular curved surfaces a, b for preventing the lubricant from being scraped off,
By applying lubricant to the mating contact surface of each elastic tube, the lubricant can be applied to the corners of the ends of the elastic tube when the elastic tube is tightly fitted onto the cable connection. They can be fitted smoothly without being scraped off, making the fitting work smooth and easy. The embodiment shown in the second drawing has the same structure as the embodiment shown in the first drawing, and also has a circular curved surface for preventing the lubricant from being scraped off at the corner on the center side of the outer surface of the elastic cylindrical bodies 1, 1 of the insulating spacer. b, and the tapered surface 2 connected to the circular curved surface b as shown in the first figure is not formed, and the end h of the outer semiconductive layer 5 of the elastic cylindrical body 3 of the elastic rubber insulating cylinder is formed into a circular shape. It is formed on the curved surface part b, and the same reference numerals as in FIG. 1 indicate the same parts. The embodiment shown in the third figure is a stress cone 9 made of an elastic cylindrical body made of cylindrical rubber and provided with an electrode 10 for mitigating an electric field.
In this example, d is a circular curved surface formed at the inner corner of this elastic cylindrical body to prevent lubricant from being scraped off, and lubricant such as silicone grease is applied to this inner circumferential surface. , and fit tightly into the cable terminal part 7. As a result, when fitting the elastic cylindrical body 9 of the stress cone, the lubricant is not scraped off at the corner of the end of the elastic cylindrical body, and the fitting can be performed smoothly. The radius of curvature of the circular curved parts a, b, and d is 0.5 mm.
It is better to form the above. In addition, the tapered surface 2
should be formed with a taper angle of 45 degrees or less. Table 1 shows specific examples of the above elastic cylindrical bodies.

[Table] The following Table 2 shows the results of actual measurement of the fitting force for fitting the conventional example and the elastic cylindrical body of the present invention as described above.

[Table] [Effects of the invention] As mentioned above, the present invention forms the corner of the end of the elastic cylindrical body at the power cable connection part into a circular curved part to prevent the lubricant from being scraped off. Since the structure is configured so that lubricant is applied to the mating contact surface of the body and the body is fitted into the connection part, when the elastic cylindrical body is closely fitted onto the cable connection part, the lubricant is applied to the fitting contact surface of the body, unlike conventional methods. The fitting work is smooth because the corners of the ends of the shaped bodies are not scraped off, the connection work can be performed easily and quickly, and connections with good electrical characteristics can be obtained. be.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the upper half of one embodiment of the present invention, Fig. 2 is a sectional view of the upper half of another embodiment, Fig. 3 is a sectional view of another embodiment, and Fig. 4 is a conventional example. FIG. 1, 3, 9: Elastic cylindrical body, a, b, d: Circular curved surface portion for preventing lubricant from being scraped off.

Claims (1)

[Scope of utility model registration request] In a power cable connection part in which an elastic cylindrical body is fitted to a cable connection part to form a connection part, a circular curved surface part for preventing lubricant from being scraped off is provided at a corner of the end of the elastic cylindrical body, A power cable connection part characterized in that a fitting contact surface of a cylindrical body is fitted with a connection part with a lubricant applied thereto.