JP2003272760A - Cable connection part and insulation plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of parts of an insulation plug, to simply attach the insulation plug to an open terminal port, and to prevent a stopper from falling off when the insulation plug is attached or detached. <P>SOLUTION: An attachment hole 16a of a stopper 16 is fitted to a boss 15 installed at a tip end of a cone part 90a of an insulation plug body 90, to integrate the insulation plug body 90 and the stopper 16. The tip end of a spring 17 is inserted in a cylindrical part 90d of the insulation plug body 90 in a manner that the inside diameter of the cylindrical part 90d is enlarged, to bind the tip end of the spring 17 with the cylindrical part 90d. After the stopper 16 and the spring 17 are attached to the insulation plug body 90, they are inserted in an open terminal port 4b of a bushing 4. A metallic plate 18 is arranged on a rear end side of the spring 17, and fastened to a side wall 1b of a device case using a fixing bolt 19. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable connecting portion and an insulating plug, and more particularly, an insulating plug is attached to a vacant charging port of a bushing such as a device direct connection type terminal connecting portion or branch connecting portion of a power cable. The present invention relates to a cable connecting portion and an insulating plug.

[0002]

2. Description of the Related Art Generally, an empty plugging port of a power cable directly connected to a device or a branch connecting part has an insulating plug body made of a pre-molded insulator to electrically insulate the empty plugging port. An insulating plug having a spring or the like is attached.

FIG. 3 shows a longitudinal sectional view of this type of insulating plug. In the figure, a bushing 30 having two charging ports is airtightly attached to a sealed device case (not shown) that houses electric devices (not shown) such as a switch and a transformer. An end (not shown) of the power cable is plug-in connected to the power inlet (not shown) of the power cable, and an insulating plug 32 is attached to the other power outlet (hereinafter referred to as “vacant power port”) 31. ing. The bushing 30 is electrically connected to an electric device in the device case via a conductor pull-out rod 33 embedded in the bushing 30.

The insulating plug 32 has a cone portion 34 mounted on the inner wall surface of the vacant charging port 31 at the tip thereof.
5, a shield fitting 36 integrally provided at the rear end of the insulating plug body 35, and a pressing member that is disposed between the shield fitting 36 and a washer 37 described later to press the insulating plug body 35 toward the bushing 30 side. A device 38 and a stopper 39 provided at the tip of the insulating plug body 35 are provided.

The pressing device 38 has a cap-shaped protective cover 40 attached to the outer wall of the bushing 30 and a plurality of through holes (not shown) fitted to the inner peripheral wall of the protective cover 40.
A circular washer 37 having a shaft 41, a shaft 41 penetrating each through hole of the washer 37 and having a tip end erected on the shielding fitting 36, the shielding fitting 36 and the washer 37 of each shaft 41.
And a spring 42 fitted between them.

The insulating plug 32 having such a structure is provided with the washer 3
7, the shaft 41 and the spring 42 are assembled as shown in the figure, and then the flange portion 40a of the protective cover 40 is attached to the outer wall of the bushing 30 to compress the spring 42 in the axial direction.
The cone portion 34 is pressed against the inner wall surface of the empty electricity charging port 31 of the bushing 30, and thus the insulation performance of the interface between the inner wall surface of the empty electricity charging port 31 and the cone portion 34 is secured.

[0007]

However, since the insulating plug having such a structure requires accessories such as a shaft for inserting a spring and a washer,
There are problems that the number of parts is large and assembly of accessories is complicated.

For this reason, recently, as shown in FIG. 4, an insertion hole 51 is provided in the rear end portion of the insulating plug body 50, and a spring 52 is inserted into the insertion hole 51. An insulating plug 55 having a structure in which a portion is pressed by a metal plate 54 attached to the outer wall of the bushing 53 is used.

However, the insulating plug 5 having such a structure is used.
In Fig. 5, in order to prevent the spring 52 from coming off the insertion hole 51, an adhesive (not shown) is used to fix the spring 52.
Since the tip of the plug must be fixed in the insertion hole 51, the assembly of the insulating plug 55 becomes complicated. In addition, since the insulating plug body 50 and the stopper 56 disposed at the tip of the insulating plug body 50 are formed separately, when the insulating plug 55 is attached to the empty charging port 57 of the bushing 53. When removing the insulating plug 55 from the empty charging port 57 of the bushing 53, the stopper 56 may fall, damaging the inner wall surface of the empty charging port 57 of the bushing 53 or damaging the stopper 56 itself. was there.

The present invention has been made in order to solve the above-mentioned problems, and the number of parts of the insulating plug can be reduced, and the insulating plug can be easily attached to the empty charging port of the bushing. It is an object of the present invention to provide a cable connecting portion and an insulating plug that do not cause the stopper to drop when the plug is attached or removed.

[0011]

In order to achieve such an object, the cable connecting portion of the present invention is a cable connecting portion in which an insulating plug is attached to an empty charging port of a bushing.
The insulation plug has a cone portion attached to the inner wall surface of the empty electricity charging port at the tip portion and a cylindrical portion at the rear end portion which is erected axially outward, and a cylindrical shape. And a spring which is attached to the portion and presses the insulating plug body toward the bushing side.

Further, in the cable connecting portion of the present invention, an insulating plug is attached to an empty charging port of the bushing, and the insulating plug is attached to the inner wall surface of the empty charging port at the tip. An insulating plug body having a cone portion and a rear end portion standing upright axially outwardly; and a spring attached to the cylindrical portion for pressing the insulating plug body toward the bushing side. , A stopper integrally attached to the tip of the insulating plug body.

Further, the cable connecting portion of the present invention is a cable connecting portion in which an insulating plug is attached to an empty charging port of a bushing, and the insulating plug is a cone attached to the inner wall surface of the empty charging port at its tip. An insulating plug body having a portion, a spring arranged at the rear end of the insulating plug body to press the insulating plug body toward the bushing side, and a stopper integrally attached to the tip of the insulating plug body. ing.

Also, in the cable connecting portion of the present invention, a boss that expands and contracts radially outward in the axial direction is continuously provided at the tip of the cone portion, and a stopper is provided with a mounting hole corresponding to the boss. The stopper mounting hole is fitted to the boss.

Further, the spring in the cable connecting portion of the present invention is formed by winding a metal wire rod having a rectangular cross section in a coil shape.

The insulating plug of the present invention is an insulating plug to be mounted on the bushing of the cable connecting portion, and has a cone portion mounted on the inner wall surface of the bushing at the front end and axially outward at the rear end. An insulating plug body having a tubular portion erected toward
And a spring that is attached to the tubular portion and presses the insulating plug body toward the bushing side.

Further, the insulation plug of the present invention is an insulation plug to be mounted on the bushing of the cable connecting portion, and has a cone portion mounted on the inner wall surface of the bushing at the tip end and an axially outer end at the rear end portion. Insulating body having a tubular portion standing upright, a spring attached to the cylindrical portion to press the insulating body toward the bushing side, and integrally attached to the tip of the insulating body. It has a stopper.

Further, the insulation plug of the present invention is an insulation plug to be attached to a bushing of a cable connecting portion, and has an end portion having a cone portion to be attached to an inner wall surface of an empty charging port, A spring is provided at the rear end of the insulating plug body to press the insulating plug body toward the bushing side, and a stopper integrally attached to the tip of the insulating plug body.

In the insulating plug according to the present invention, a boss that expands and contracts radially outward in the axial direction is continuously provided at the tip of the cone portion, and the stopper is provided with a mounting hole corresponding to the boss. The mounting hole is fitted on the boss.

Further, the spring in the insulating plug of the present invention is formed by winding a metal wire rod having a rectangular cross section in a coil shape.

According to the cable connecting portion and the insulating plug of the present invention, since the spring can be fixed to the tubular portion only by inserting the spring into the tubular portion, the insulating plug can be easily assembled, In addition, since the stopper can be attached to the tip of the cone with one touch, there is no risk of dropping the stopper when installing or removing the insulating plug, and a so-called angular section spring with a high spring constant was used as the spring. In this case, the spring can be self-supporting and the number of parts can be further reduced, so that the insulating plug can be assembled more easily.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to a device direct connection type cable terminal connecting portion will be described below with reference to the drawings.

FIG. 1 is a schematic explanatory view of a device direct connection type cable terminating connection portion according to the present invention, and FIG. 2 is a vertical sectional view of a bushing and an insulating plug attached to an empty charging port of the bushing. In FIG. 2, the same parts as those in FIG. 1 are designated by the same reference numerals.

In FIG. 1A, an electric device (not shown) such as a switch or a transformer is housed in a sealed device case 1, and a bottom plate 1a of the device case 1 has a first bushing. 2 is attached in an airtight manner, and a second bushing 3 is attached in an airtight manner in the vicinity of the first bushing 2 if necessary with a space therebetween. A third bushing 4 is airtightly attached to the side wall 1b of the device case 1.

The first, second and third bushings 2, 3, 4
Respectively have electrode portions 2a, 3a, 4a at their tips,
A power supply port 2 whose diameter is reduced from the base end toward the base end.
b, 3b, 4b, the electrode portion 2a of the first bushing 2 is connected to the electric device via the first lead wire 5, and the electrode portion 3a of the second bushing 3 is the second lead wire. It is connected to the electrode portion 4 a of the third bushing 4 via 6.

The charging port 2b of the first bushing 2
Is, for example, a 24-36 kV class CV shown in FIG.
A terminal portion 7 of the cable (crosslinked polyethylene vinyl insulation cable) is plugged in, and a dummy cable plug 8 shown in FIG. 1 (c) is attached to the charging port 3b of the second bushing 3, for example. An insulating plug 9 shown in FIG. 1 (e) is attached to a charging port (hereinafter, referred to as an “empty charging port”) 4b of the bushing 4 of No. 3. Here, the dummy cable plug 8 is removed from the charging port 3b of the second bushing 3 when required, and the dummy cable plug 8 is removed, for example, as shown in FIG.
The first test connector 10 shown in FIG. 2 is plugged in, and the third bushing 4 has an insulating plug 9 when required.
Is removed and, for example, the second test connector 11 shown in FIG. 1F is plugged in.

As shown in FIG. 2A, the third bushing 4 is provided with a bushing body 12 made of epoxy resin or the like, and an electrode portion (third electrode) is provided at the center of the tip of the bushing body 12. Part) 4a is embedded, and a vacant charging port 4b for receiving the insulating plug 9 is formed at the base end. In the bushing main body 12 having such a structure, the empty power charging port 4b is attached to the mounting hole 1c formed in the device case 1.
Toward the side, the side wall 1 inside the device case 1 is as follows.
It is airtightly installed on b. That is, the opening of the vacant charging port 4b of the bushing body 12 is brought into contact with the outer peripheral edge of the mounting hole 1c of the device case 1 via the gasket 13, and this is passed through the side wall 1b of the device case 1 (not shown). The tip of the mounting bolt 14 inserted in the bushing body 12 is screwed into the embedding metal fitting 4c of the bushing body 12 so that the bushing body 12
Is hermetically attached to the inner side wall 1b of the device case 1.

As shown in FIG. 2B, the insulating plug 9 is provided with an insulating plug body 90 made of a premolded insulator having rubber-like elasticity such as ethylene propylene rubber (EP rubber). A bushing 4 is provided at the tip of the main body 90.
A tapered cone portion 90a to be mounted on the inner wall surface of the vacant charging port 4b is provided, and a cylindrical shield fitting 90b is embedded in the rear end portion so as to expose the rear end surface. An annular cover 90c that covers the outer peripheral edge of the rear end surface of the shield fitting 90b is continuously provided at the rear end of the insulating plug body 90, and the inner peripheral edge of the cover 90c is directed axially outward. And a cylindrical portion 90d having a cylindrical shape is continuously provided. Here, the inner diameter of the tubular portion 90d is equal to the coil-shaped spring 1 described later.
The diameter of the tubular portion 90d is slightly smaller than the outer diameter of the spring 7, and the axial length of the tubular portion 90d is approximately half the axial length of the spring 17.

A boss 15 that expands and contracts in the radial direction is provided so as to project outward in the axial direction at the center of the tip surface of the cone portion 90a. The boss 15 is arranged on the tip surface of the cone portion 90a. The stopper 16 provided is attached with one touch. Here, the stopper 16 is composed of a circular metal plate or the like having a diameter substantially the same as the diameter of the tip surface of the cone portion 90a, and a mounting hole 16a is provided in the center thereof.

As shown in FIG. 2 (c), the boss 15 has an outer diameter substantially the same as that of the mounting hole 16a of the stopper 16, and is provided continuously to the tip end surface of the cone portion 90a in the axially outward direction. A head portion 15b having a columnar neck portion 15a which is formed into a column shape, and a head portion 15b which is continuously provided axially outward at the tip portion of the neck portion 15a and has a diameter larger than the outer diameter of the neck portion 15a. A void 15c is provided at the center of the head 15b, the diameter of which is reduced from the tip of the head 15b toward the neck 15a. The taper portion 15d is provided so that the diameter of the taper portion increases.

The spring 17 is composed of, for example, a metal wire rod having a rectangular cross section wound in a coil shape (hereinafter referred to as "coil").
It is called a "square cross section spring". ), The outer diameter of which is the cylindrical portion 9
The diameter is slightly larger than the inner diameter of 0d. Here, when a spring having a rectangular cross section is used as the spring 17, the spring 17 can be self-supporting, and since the spring constant is large, a required spring force can be secured by one spring 17, and by extension, the spring 17 can be secured. It is possible to further reduce the number of used.

Next, a method of mounting the insulating plug 9 having such a structure on the vacant charging port 4b of the third bushing 4 will be described.

First, as shown in FIGS. 2 (b) and 2 (c),
The mounting hole 16a of the stopper 16 is fitted into the boss 15 provided at the tip of the cone portion 90a, and the stopper 16 is pushed toward the tip surface of the cone portion 90a. Then, the taper portion 15d of the head portion 15b forming the boss 15 becomes the gap portion 1
The head portion 15b is reduced in diameter as a whole by being pressed toward 5c, and by extension, the mounting hole 16 of the stopper 16 is attached.
a is fitted to the neck portion 15a of the boss 15 and the neck portion 15a
The separation from a is prevented. As a result, the cone portion 90
The stopper 16 can be attached to the tip portion of a with one touch, and the insulating plug body 90 and the stopper 16 can be integrated.

Next, as shown in FIG. 2B, the tip of the spring 17 is inserted into the tubular portion 90d of the insulating plug body 90 so as to widen the inner diameter of the tubular portion 90d. As a result, the tip of the spring 17 has the tubular portion 90.
It is restrained by d and is prevented from being detached from the tubular portion 90d.

After the stopper 16 and the spring 17 are attached to the insulating plug body 90 in this way, the stopper 16 and the spring 17 are attached to the vacant charging port 4b of the third bushing 4 as shown in FIG. 2 (d). As shown in FIG.
The circular metal plate 18 shown in (e) is arranged, and the metal plate 18 is fastened to the side wall 1b of the equipment case 1 using the mounting bolts 19 as shown in FIG. 2 (d).
As a result, the spring 17 is urged by the spring force toward the tip in the axial direction, the cone portion 90a of the insulating plug body 90 is pressed against the inner wall surface of the vacant power charge port 4b, and, by extension, the inner wall surface of the vacant power charge port 4b. The insulating performance of the interface between the outer peripheral surfaces of the cone portion 90a is ensured.

In the above-described embodiment, the device direct connection type terminal connection portion of the CV cable is described, but the present invention is not limited to this, and a bushing having a vacant charging port, for example, a Y branch of the CV cable. The present invention may be applied to a connecting portion or the like, and the bushing having a vacant charging port is not limited to being attached to the side wall of the equipment case, and may be attached to the bottom plate or the top of the equipment case.

[0037]

As is apparent from the above description, according to the cable connecting portion and the insulating plug of the present invention, the spring can be grasped by the tubular portion only by inserting the spring into the tubular portion. Can be easily assembled,
Also, since the stopper can be attached to the boss provided at the tip of the cone portion with one touch, there is no risk of dropping the stopper when attaching or detaching the insulating plug. In case the spring can be self-supporting,
Since the number of parts can be further reduced, the insulating plug can be assembled more easily. Therefore, according to the cable connecting portion and the insulating plug of the present invention, unlike the conventional cable connecting portion, a pressing device having a large number of parts is not used, and an adhesive can be eliminated. In addition, the insulating plug can be easily attached to the empty electricity inlet.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a device direct connection type cable termination connecting part in a cable connecting part of the present invention, FIG. 1 (a) is an explanatory view showing a mounting state of a bushing with respect to a device case, and FIG. 1 (b) is a power cable. Side view of the terminal end of Fig. 1 (c)
Is a side view of the dummy cable plug, FIG. 1 (d) is a side view of the first test connector, FIG. 1 (e) is a side view of the insulating plug, and FIG. 1 (f) is a side view of the second test connector. Fig.

FIG. 2 is a vertical cross-sectional view of a bushing and an insulating plug in a cable connection portion of the present invention, FIG. 2 (a) is a vertical cross-sectional view of a bushing having a vacant charging port, and FIG. 1 (b) is a vertical cross-sectional view of the insulating plug. Fig. 1 (c) is an enlarged view of a main part of Fig. 1 (b).
FIG. 1D is a vertical cross-sectional view showing how the insulating plug is attached to an empty charging port of the bushing, and FIG. 1E is a front view of the mounting plate.

FIG. 3 is a vertical sectional view of a conventional insulating plug.

FIG. 4 is a vertical cross-sectional view of another conventional insulating plug.

[Explanation of symbols]

1b ... Side wall 4 ... Bushing 4b ・ ・ ・ ・ Electricity outlet 9 ... Insulation plug 15 ... Boss 16 ... Stopper 16a ・ ・ ・ ・ Mounting hole 17 ... Spring 90 ・ ・ ・ ・ Insulator body 90a ... Cone 90d ... Cylindrical part

[Selection diagram] Figure 2

Claims (10)

[Claims] 1. A cable connecting portion in which an insulating plug is attached to an empty charging port of a bushing, wherein the insulating plug has a cone portion mounted on an inner wall surface of the empty charging port at a rear end thereof. An insulating plug body having a tubular portion that is erected in the axially outward direction, and a spring that is attached to the tubular portion and presses the insulating plug body toward the bushing side. And cable connection part. 2. A cable connecting portion in which an insulating plug is attached to an empty charging port of a bushing, wherein the insulating plug has a cone portion mounted on an inner wall surface of the empty charging port at a front end portion and a rear end. Insulation plug body having a tubular portion that is erected in the axially outward direction, a spring that is attached to the tubular portion and presses the insulation plug body toward the bushing side, and the insulation plug body And a stopper integrally attached to the tip of the cable connecting part. 3. A cable connecting portion in which an insulating plug is attached to an empty charging port of a bushing, the insulating plug having an end portion having a cone portion mounted to an inner wall surface of the empty charging port. A spring disposed at the rear end of the insulating plug body to press the insulating plug body toward the bushing side, and a stopper integrally attached to the tip of the insulating plug body. Characteristic cable connection part. 4. A boss which extends and contracts radially outward in the axial direction is connected to the tip of the cone portion, and a mounting hole corresponding to the boss is formed in the stopper. The cable connection part according to any one of claims 1 to 3, which is fitted to the boss. 5. The cable connecting portion according to claim 1, wherein the spring is formed by winding a metal wire rod having a rectangular cross section in a coil shape. . 6. An insulating plug attached to a bushing of a cable connecting portion, wherein a cone portion is attached to an inner wall surface of the bushing at a front end portion thereof, and is erected axially outward at a rear end portion. An insulating plug body comprising: a tubular portion having a closed shape; and a spring that is attached to the tubular portion and presses the insulating plug body toward the bushing side. 7. An insulating plug attached to a bushing of a cable connecting portion, wherein a cone portion is attached to an inner wall surface of the bushing at a front end portion and is erected axially outward at a rear end portion. An insulating plug body having a cylindrical portion, a spring attached to the cylindrical portion to press the insulating plug body toward the bushing side, and a stopper integrally attached to the tip of the insulating plug body. An insulating plug comprising: 8. An insulating plug to be attached to a bushing of a cable connecting portion, the insulating plug main body having a cone portion to be mounted on an inner wall surface of the empty charging port at a tip end, and an insulating plug main body after the insulating plug main body. An insulating plug comprising: a spring disposed at an end portion to press the insulating plug body toward the bushing side; and a stopper integrally attached to a tip end portion of the insulating plug body. 9. A boss that expands and contracts radially outward in the axial direction is continuously provided at the tip of the cone portion, and a mounting hole corresponding to the boss is formed in the stopper. The insulating plug according to any one of claims 6 to 8, which is fitted to the boss. 10. The insulating plug according to claim 6, wherein the spring is formed by winding a metal wire rod having a rectangular cross section in a coil shape.