JP2000287349A - Case for prefabricated connection part for cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a case whose outside diameter is made small and which can be made small and lightweight. SOLUTION: The base end part of an insulating tube 5a is butted to the tip face of a connection tube part 37 which is formed in the circumferential part of an opening 7a in a body 3a constituting a case 2a. An outward flange part 43 which is formed on the outer circumferential face in the base end part of the insulating tube 5a is retained by a cap nut 44 which is screwed to the connection tube part 37. A coupling leg part 47 which is formed at a second end plate 6a in order to couple a cover 33 to the insulating tube 5a is embedded in and supported by the tip part of the insulating tube 5a when the insulating tube 5a is injection-molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case for a prefabricated connecting portion for a cable, and more particularly to an improvement in a case for accommodating a prefabricated connecting portion for connecting ends of a CV cable used as an underground power transmission line. .

[0002]

2. Description of the Related Art Conventionally, a prefabricated connection as shown in FIG. 9 has been used to connect the ends of CV cables constituting an underground power transmission line. The prefabricated connection shown in FIG. 9 converts one CV cable 1 into two CV cables 1, 1 (or conversely, two CV cables 1, 1 into one CV cable 1). This shows a structure called a Y joint for connection. First, the structure of the prefabricated connection portion will be described.

The case 2 includes a main body 3, a first end plate 4,
Each of them comprises three insulating cylinders 5, 5 and second end plates 6, 6 corresponding to the number of CV cables 1, 1 to be connected. The main body 3 is made of metal and formed in a cylindrical shape, and a first annular end plate 4 made of metal is fixed to an opening of one end (the left end in FIG. 9) of the main body 3 by screwing. ing. The CV cable 1 and the CV cable 1 are connected to the center of the first end plate 4 and the other end (the right end in FIG. 9) of the main body 3, respectively.
Three circular openings 7, 7 for inserting one connection end are provided. Each of the insulating cylinders 5, 5 each formed into a short cylindrical shape by an insulating material such as an epoxy resin, is fixed by screws around the openings 7, 7.
Further, each of the second end plates 6, 6 is connected to each of the insulating cylinders 5, 5,
Is screwed and fixed to the outer edge (right edge in FIG. 9).

[0004] Inside the case 2 constructed as described above,
An insulating molded article 8 made of an insulating material such as an epoxy resin is held and fixed. That is, the insulating molded article 8 is fixed in the case 2 by screwing an end portion of the insulating molded article 8 to a portion near the inner peripheral surface of each of the second end plates 6, 6. A conductor connector 9 made of a metal having good conductivity such as copper is embedded and supported in such an insulating molded product 8. The conductor connector 9 is provided with three connection recesses 10, 10 corresponding to the number of the CV cables 1, 1 to be connected, facing the openings 7, 7 respectively. In the illustrated example, each of the connection concave portions 10 and 10 is formed as a tapered hole whose inner diameter becomes smaller from the opening to the back.

[0005] Each of the CV cables 1 and 1 is formed by covering the periphery of a conductor 11 with an insulating layer 12. At a connection portion, an end of the conductor 11 protrudes from an end of the insulating layer 12. ing. The periphery of the insulating layer 12 is covered with a shield wire 13, and the periphery of the shield wire 13 is covered with a surface covering 14 made of an insulating material. The shield wire 13 is grounded via studs 15 and 15, which will be described later, and the second end plates 6 and 6.

The conductor 11 of each of the CV cables 1 and 1
Are connected to the conductor connector 9 via a connection sleeve 16 as shown in FIGS. The connection sleeve 16 made of a metal having good conductivity such as copper.
The outer peripheral surface of the first half (the first half in the insertion direction into the connection recess 10, the left half in FIG. 10) is an inclined surface inclined in the same direction as the inner periphery of the connection recess 10, A receiving-side inclined surface 17 whose outer diameter becomes smaller toward the base end edge is formed on the outer periphery. A plurality of slits 18 are formed in the connection sleeve 16 at both front and rear edges so that the diameter can be elastically contracted. Such a connection sleeve 1
Numeral 6 is inserted into each of the connection concave portions 10 together with the tip of the conductor 11 in a state of being fitted to the tip of the conductor 11.

The inner and outer peripheral surfaces of the connecting sleeve 16 and the outer peripheral portion of the end of the conductor 11 are fixed by pressing and fixing sleeves 19 as shown in FIGS. The surface and the inner peripheral surface of the connection recess 10 are in close contact with each other. Pressing and fixing sleeve 19
A male screw which is screwed with a female screw formed on the inner peripheral surface of the opening end of the connection concave portion 10 on the outer peripheral surface is provided with a pushing-side inclined surface which engages with the receiving inclined surface 17 on the distal end surface (left end surface in FIG. 12). Face 2
0 is formed respectively. Such a pressing and fixing sleeve 19 is screwed into the opening end of each of the connection concave portions 10,
When further tightened, the pressing and fixing sleeve 19 presses the connection sleeve 16 toward the back of each of the connection recesses 10. Then, based on the engagement between the outer peripheral surface of the first half portion of the connection sleeve 16 and the inner peripheral surface of the concave portion 10 for connection and the engagement between the inclined surface 17 on the receiving side and the inclined surface 20 on the pushing side, the connection sleeve 16 is formed. Is pushed into the connection recess 10 while reducing the diameter. As a result, the inner and outer peripheral surfaces of the connection sleeve 16 and the outer peripheral surface of the end of the conductor 11 and the inner peripheral surface of the connection recess 10 are in close contact with each other, and the end of the conductor 11 and the conductor connector 9 are connected to each other. To ensure conduction.

A part of the insulating molded article 8 which is located around the end of the insulating layer 12 is inclined in such a direction that the inner diameter decreases toward the connection recesses 10, 10. One inner diameter side tapered surface 22 is formed.
In the state where the end of the conductor 11 and the conductor connector 9 are connected as described above, the first inner diameter side tapered surfaces 22, 2,
The gap existing between the insulating layer 2 and the insulating layer 12 is closed by the pre-mold insulators 21 and 21. Each of these pre-mold insulators 21 is a combination of an insulating portion made of EP rubber and a semiconductive portion made of EP rubber to which carbon is added, and has a shape like an abacus ball stretched in the axial direction. A first outer diameter side tapered surface 23 which can be in close contact with each of the first inner diameter side tapered surfaces 22 is formed in one half in the axial direction of each of the pre-mold insulators 21, 21. or,
On the other half in the axial direction of each of the pre-mold insulators 21, 21, a second outer diameter side tapered surface 24 is formed which is inclined in a direction in which the outer diameter decreases as the distance from each of the connection recesses 10, 10 increases. are doing.

Each of the pre-mold insulators 21, 2 as described above
1 are pressed by the pressing sleeves 25 toward the first inner diameter side tapered surface 22. The inner peripheral surface of each of these pressing sleeves 25 made of fiber reinforced plastic or the like is a second inner diameter side tapered surface 26 inclined in the same direction as the second outer diameter side tapered surface 24. It is arranged around the radial side tapered surface 24. Each of the pressing sleeves 25 is pressed toward the pre-mold insulator 21 by pressing means 27.

The pressing means 27, 27 are provided between the second end plates 6, 6 and the pressing sleeves 25, 25. Each of these second end plates 6, 6 has a fixed ring 28.
Are supported by a plurality of studs 15, 15, respectively. Further, at the base end surface of each pressing sleeve 25, that is, at a plurality of circumferential positions on the end surface opposite to the second inner diameter side tapered surface 26, the base end portions of a plurality of guide rods 29, 29 are provided. Is fixed. The distal end of each of the guide rods 29 is inserted into a guide hole (not shown) formed at a portion near the inner diameter of each of the fixed rings 28. Further, compression coil springs 30, which are pressing springs, are provided around the guide rods 29, between the fixed rings 28 and the pressing sleeves 25.

Each of the pressing sleeves 25, 25 is pressed against each of the pre-mold insulators 21, 21 by the pressing means 27, 27 respectively configured as described above.
The first inner diameter side tapered surface 22 and the first outer diameter side tapered surface 23 are in close contact with the inner peripheral surface of the pre-mold insulator 21 and the outer peripheral surface of the end of the insulating layer 12 without any gap. . For this reason, the insulation between the insulating layer 12 and the insulating molded article 8 is not impaired due to the existence of the gap.
In particular, the compression coil springs 3
0, 30 are incorporated, so that the pre-molded insulator 2
1 can be prevented from forming a gap between the inner peripheral surface 1 and the outer peripheral surface at the end of the insulating layer 12. The pressing force of the pressing means 27, 27 against the pressing sleeves 25, 25 changes the positions of the nut 31 and the lock nut 32 screwed to the tips of the studs 15, 15 and the fixed ring. 28 and the distance between the second end plate 6 and the compression coil springs 3
It is adjusted by changing the compression amount of 0, 30.

Each of the insulating cylinders 5 and 5 is
Body 3 and a cover 3 that covers the pressing means 27, 27
3 and 33 are isolated from each other so that when a failure such as insulation failure occurs, the location of the failure can be specified. For this purpose, the body 3 and the covers 33,
33 are independently grounded. The connecting portion between one end of each of the insulating cylinders 5 and 5 having such a function and the end of the first end plate 4 or the body 3, or the other end of each of the insulating cylinders 5 and 5 and the The joints between the two end plates 6 and 6 are formed by nut pieces 34 and 34 embedded in the ends of the insulating cylinders 5 and 5, respectively.
Alternatively, the bolts 35, 3 inserted through the first and second end plates 4, 5
5.

That is, the nut pieces 34, 34 are formed at both ends of the insulating cylinders 5, 5, and the screw holes of the nut pieces 34, 34 are formed when the insulating cylinders 5, 5 are formed. The insulating cylinders 5 and 5 are embedded so as to open at both end surfaces. Then, bolts 35, 35 inserted through the flange 36 formed on the inner peripheral edge of the one end opening of the main body 3 or the first and second end plates 4, 5 are screwed into the screw holes of the nut pieces 34, 34. Then, one end of each of the insulating cylinders 5 and 5 and the end of the first end plate 4 or the end of the main body 3 are connected to each other.
And the second end plates 6 and 6 are connected to each other. Although not shown, an O-ring is locked over the entire periphery of the butting portion between the end surfaces of the insulating cylinders 5 and the mating surface to seal the butting portion.

[0014]

In the case of the conventional structure as described above, there is a disadvantage that the outer diameter of the case 2 becomes large and an installation space is required. In other words, O-rings are provided at the butting portions of the insulating cylinders 5 and 5 at both end surfaces and the mating surfaces to seal the butting portions to prevent moisture from entering the case 2. Must be arranged so as to avoid the connecting bolts 35, 35. Therefore,
The O-ring and the bolts 35, 35 are present at the joints between the opposite ends of the insulating cylinders 5, 5 and the mating member in series with each other over the diameter direction of the insulating cylinders 5, 5. Become. Accordingly, it is necessary to increase the width of the end surfaces of the insulating cylinders 5 and 5 in the diametrical direction, and accordingly, the outer diameter of the prefabricated connection portion for the cable increases. In particular, the portion where the insulating cylinders 5 and 5 are directly connected to the end of the main body 3 (the right side portion in FIG. 9) is located outside the prefabricated cable connecting portion as the increase in the outer diameter of each of the insulating cylinders 5 and 5 is maintained. Improvements are desired in order to increase the diameter. The case of the prefabricated cable connection portion of the present invention has been invented in view of the above-described circumstances.

[0015]

Each of the prefabricated cable connection cases of the present invention has at least one case, like the conventional prefabricated cable connection case described above.
A tubular body for housing a conductor connector for connecting the ends of the conductors constituting the pair of cables and an insulation molding surrounding the periphery of the conductor connector, and a tubular body made of an insulating material, An insulating tube having one end connected to one end opening of the main body, and an end plate fixed to the other end of the insulating tube for connecting a cover to the other end of the insulating tube.

In particular, in the case of the prefabricated cable connecting portion of the present invention, in the case of the prefabricated cable connecting portion of the present invention, one end of the main body and one end of the insulating cylinder are provided. The connecting portion is composed of a male screw, an outward flange, and a cap nut. The male screw is formed on the outer peripheral surface of a cylindrical portion formed in a portion of the main body to which the insulating cylinder is to be connected. The outward flange is formed on an outer peripheral surface of one end of the insulating cylinder so as to protrude diametrically outward. Further, the cap nut is formed in a substantially cylindrical shape, and a female screw to be screwed with the male screw is formed on an inner peripheral surface of one half of the cap nut, and the outward flange is engaged with the outer flange on the inner peripheral surface of the other end. An inward flange portion is provided to be pressed toward one end surface of the main body. The other end of the insulating tube and the end plate are connected by embedding a locking portion formed on a part of the end plate in the insulating tube when the insulating tube is formed. It is.

Further, in the case of the prefabricated connecting portion for a cable according to the present invention, the connecting portion between the one end of the main body and the one end of the insulating tube is used when the insulating tube is formed. A coupling cylinder connected by embedding a first locking portion formed in a part thereof in the insulating cylinder is connected to one end of the main body, with a seal ring interposed between the peripheral surfaces. It is fitted so that it can be displaced in any direction. The other end of the insulating tube and the end plate are connected by embedding a locking portion formed on a part of the end plate in the insulating tube when the insulating tube is formed. It is.

[0018]

In the case of the prefabricated connecting portion for a cable according to the present invention constructed as described above, the connecting portion between one end of the insulating tube and one end of the main body is formed by a cap nut or a connecting tube. In order to form the connecting portion, it is not necessary to increase the width of the insulating cylinder in the diameter direction. In addition, since the cap nut or the coupling cylinder does not increase in size in the diameter direction, the outer diameter of the connecting portion between one end of the insulating cylinder and one end of the main body is smaller than that of the above-described conventional structure. it can. Further, since the connecting portion between the other end of the insulating cylinder and the end plate does not require an O-ring or a bolt, the outer diameter of the connecting portion can be reduced.

[0019]

1 to 7 show a first embodiment of the present invention corresponding to claim 1. FIG. The feature of the present invention resides in the structure of a case for accommodating the components of the prefabricated connection portion for a CV cable. The entire structure of the prefabricated connection portion for the CV cable is the same as, for example, the conventional structure shown in FIG. 9 described above. Therefore, the duplicated illustration and description will be omitted or simplified. In addition, a description will be given focusing on portions different from the above-described conventional structure.

The case 2a to which the present invention is applied has a cylindrical main body 3a made of metal. Around the circular opening 7a formed at the end of the main body 3a, a short cylindrical connecting cylinder 3 is formed.
7 are formed. A male screw 38 is provided on the outer peripheral surface of the connecting tube portion 37, a locking groove 39 is provided on the distal end surface (the right end surface in FIG. 1),
Each is formed over the entire circumference. Then, a base end portion of the insulating cylinder 5a formed in a short cylindrical shape with an insulating material such as a synthetic resin such as an epoxy resin is provided in the connecting cylindrical portion 37.
The left end of FIG. 1) is connected to one end described in FIG.
Furthermore, a second end plate 6a (an end described in claim 1) for connecting a cover 33 to a tip end (the other end described in claim 1 and the right end in FIG. 1) of the insulating cylinder 5a. Plate) is fixed.

The feature of the present invention resides in a joint between the both ends of the insulating tube 5a, the connecting tube 37 and the second end plate 6a. Therefore, first, a connection portion between the base end portion of the insulating tube 5a and the connecting tube portion 37 will be described. On the inner peripheral edge of the distal end portion of the connection tube portion 37, a step-shaped engaging concave portion 40 is formed over the entire circumference. On the other hand, an upright wall-shaped engaging projection 41 is formed over the entire circumference at an end near the inner periphery of the base end surface of the insulating cylinder 5a. With the base end surface of the insulating tube 5a butted against the distal end surface of the connecting tube portion 37, the engaging concave portion 40 and the engaging convex portion 41 are fitted without looseness, and the insulating tube is fitted to the case 2a. 5a is positioned.
The O-ring 42 locked in the locking groove 39 is elastically compressed over the entire circumference between the bottom surface of the locking groove 39 and the base end surface of the insulating cylinder 5a. And the connecting portion of the connecting cylinder 37 is sealed.

Also, on the outer peripheral surface of the base end of the insulating cylinder 5a,
An outward flange 43 protruding diametrically outward from the outer peripheral surface of the base end of the insulating cylinder 5a is formed over the entire circumference. Then, the outward flange 43 is pressed down toward the distal end surface of the connection tube 37 by the cap nut 44. The cap nut 44 is formed in a substantially cylindrical shape, and has a female screw screwed with the male screw 38 on an inner peripheral surface of a base half thereof (one half of the claim 1 and a left half of FIG. 1). 45 are formed. Further, an inward flange portion 46 is formed on the inner peripheral surface of the distal end portion of the cap nut 44 (the other end portion in the first aspect, the right end portion in FIG. 1) over the entire circumference. The inward flange 46 is provided with the male screw 38.
And the set screw 45 is screwed together with the outward flange 4
3 and presses the outward flange 43 toward the distal end surface of the connection tube portion 37 (one end surface of the main body described in claim 1 and the right end surface in FIG. 1).

In the example shown in the figure, flat surfaces 53, 53 for locking a tightening tool are formed at a plurality of locations (four locations in the example shown) on the outer peripheral surface of the cap nut 44. The inward flange 46 of the cap nut 44 allows the outward flange 4
When suppressing 3, the tools locked on the flat surfaces 53, 53 are tightened with a predetermined torque. In the base half of the cap nut 44, a screw hole 54 is formed in a portion where the circumferential position of the cap nut 44 matches any one of the flat surfaces 53. ing. In the screw hole 54, the outward flange 43 is connected to the connection cylinder 37.
After tightening the cap nut 44 with a predetermined torque in order to hold the cap nut at a predetermined end surface, a set screw (not shown) is screwed into the cap nut 44, and the tip end of the set screw is abutted against the male screw 38. Prevent inadvertent loosening.

On the other hand, the tip of the insulating tube 5a and the second end plate 6a are integrally connected when the insulating tube 5a is manufactured by injection-molding the insulating material. For this purpose, a connecting leg 47 is provided at an intermediate portion in the diametrical direction (vertical direction in FIG. 1) on one surface (left surface in FIG. 1) of the second end plate 6a over the entire circumference. 6a. The connecting leg 47 is formed in a short cylindrical shape as a whole.
On the outer peripheral surface of the distal end portion (left end portion in FIG. 1), engaging projections 48 projecting outward in the diameter direction are formed over the entire circumference. The connecting leg portion 47 including the engaging ridge 48 corresponds to a locking portion described in claims. Such a connecting leg 4
7 is embedded in the insulating cylinder 5a during the injection molding of the insulating cylinder 5a. In this state, the insulating cylinder 5a
And the second end plate 6a are integrally connected. Further, since the joint portion is filled without gaps, it is possible to prevent water from entering the case 2a from the joint portion between the insulating cylinder 5a and the second end plate 6a without installing a sealing material such as packing. Can be prevented. Of course, by applying a caulking material, an adhesive or the like, the sealing property can be further enhanced.

The case 2a of the prefabricated connecting portion for a cable according to the present invention constructed as described above is composed of a base end of the insulating tube 5a and a distal end of a connecting tube 37 formed at the periphery of the opening 7a of the main body 3a. Since the connecting portion to the portion is constituted by the cap nut 44, it is not necessary to increase the diametrical width of the insulating cylinder 5a in order to constitute the connecting portion. That is, the base end surface of the insulating tube 5a and the connecting tube 37
It is sufficient that the O-ring 42 can be sandwiched between the O-ring 42 and the tip surface of the O-ring. Further, the cap nut 44 can secure sufficient strength without increasing the wall thickness, and the dimension in the diameter direction does not increase. Because of this,
Since the space for the bolt 35 can be omitted, the outer diameter of the insulating tube 5a can be reduced, and the outer diameter of the connection portion with the distal end of the connection tube portion 37 can be reduced. In addition, since the connecting portion between the distal end portion of the insulating cylinder 5a and the second end plate 6a does not require an O-ring or a bolt, the outer diameter of the connecting portion can be reduced.

In the illustrated example, the pre-molded insulator 2
A pressing device for pressing the pressing sleeve 25 with respect to 1
This is different from the conventional structure shown in FIG. As shown in FIGS. 1 and 3, a connecting cylinder 49 is provided in an axially extending state from the outer peripheral edge of the fixed ring 28 a constituting the pressing device of the present example. Locking portions 50, 50 are provided at two positions on the opposite side in the diameter direction of the distal end portion of the connecting cylinder 49, respectively.
Are provided so as to protrude outward in the diameter direction of the fixed ring 28a. In addition, through holes 51, 51 for reducing the weight are formed in a part of the connecting cylinder 49. On the other hand, at two circumferentially opposite positions of the inner peripheral edge of the second end plate 6a,
A notch 52 that can pass through each of the locking portions 50, 50;
52 are provided. The fixed ring 28a is supported on the case 2a by rotating these locking portions 50, 50 in the circumferential direction after passing through the notches 52, 52.

That is, when the fixed ring 28a is supported and fixed to the case 2a, first, as shown in FIG.
The locking portions 50, 50 and the notches 52, 52 are aligned with each other. Then, in such a state that they are aligned, each of the locking portions 50, 50 is connected to each of the notches 52, 5,
2 from the side opposite to the insulating cylinder 5a.
It is passed from right to left in FIG. 1 toward a side. Thereafter, the stationary ring 28a is rotated in the circumferential direction to shift the phases of the locking portions 50, 50 and the notches 52, 52 in the circumferential direction. In this state, the locking portions 50, 50
Is due to the elasticity of the compression coil springs 30, 30, which will be described later.
The inner end surface of the second end plate 6 (the side surface on the side of the insulating cylinder 5a, the left side surface in FIG. 1) is elastically pressed, and the case 2
a.

Screw holes 55 are provided at a plurality of positions (for example, four positions) at equal intervals in the circumferential direction of the fixed ring 28a, and through holes 56, 56 are provided at intermediate positions between the screw holes 55 adjacent in the circumferential direction.
Are formed at equal intervals in the circumferential direction and in the axial direction, respectively. As shown in FIGS. 1 and 5, twice the number (16 in the illustrated example) of the guide rods 29a and 29b are provided on the base end face of the pressing sleeve 25, as shown in FIGS. Base end (left end in FIGS. 1-2)
Are connected and fixed at equal intervals in the circumferential direction. These guide rods 29a and 29b are arranged in parallel with each other.

In the illustrated example, each of these guide rods 29
a, 29b, four guide rods 29a, 29 whose phase in the circumferential direction is at an intermediate position between the screw holes 55.
a is the other (the remaining 12) guide rods 29b, 29
The external thread 59 is formed at each of the tip portions so as to be longer than b. Each of the guide rods 29a, 29a has a guide hole 58 of a pressing ring 57 to be described below.
, Nuts 60, 60 are screwed. Even before the assembly of the prefabricated cable connection portion is completed, each of the nuts 60, 60 can be used for the compression coil spring 3 described later.
Regardless of the elasticity of 0, 30, each of the above guide rods 29a,
29b and the press ring 57 are prevented from separating. On the other hand, the other guide rod 29
The tips of b and 29b are tapered.

The pressing sleeve 25 and the stationary ring 2
8a, a ring-shaped pressing ring 57 is provided so as to be displaceable in the axial direction (left and right directions in FIGS. 1 and 5). Guide holes 58, 58 for slidably inserting the guide rods 29a, 29b are formed in the pressing ring 57 in the same phase as the guide rods 29a, 29b. Such a pressing ring 57 is disposed between the pressing sleeve 25 and the fixed ring 28a. In this state, the distal ends (right ends in FIGS. 1 and 5) of the long guide rods 29a, 29a among the guide rods 29a, 29b are inserted into the through holes 56 formed in the fixed ring 28a. are doing. On the other hand, the remaining guide rods 29b,
The tip of 29b is located in the guide holes 58 formed in the pressing ring 57.

Therefore, with the pre-mold insulator pressing device assembled, the plurality of guide rods 29a,
Among the 29b, the long guide rods 29a, 29a
The base portions are supported by the pressing sleeves 25, and the intermediate portions are supported by the guide holes 58. Also, other guide rods 29b,
29b is supported at its base end by the pressing sleeve 25, and is guided at its distal end by the guide holes 58, 58. Further, compression coil springs 30, 30 are mounted around the guide rods 29a, 29b and between the base end surface of the pressing sleeve 25 and the pressing ring 57, respectively. The compression sleeves 30 allow the pressing sleeve 25 to be freely pressed toward the pre-mold insulator 21.

Further, pressing screws 61 as shown in FIG. 7 are screwed into the respective screw holes 55 formed at four positions in the circumferential direction of the fixed ring 28a. Each of these pressing screws 61 has a male screw formed on the outer peripheral surface thereof, and a locking hole 62 having a hexagonal cylindrical inner peripheral surface formed on the base end surface. The pressing screw 61 is rotatable by locking a tool such as a hexagon wrench in the locking hole 62. The distal end surface (the left end surface in FIG. 1) of each of the pressing screws 61 abuts against one side surface (the right side surface in FIG. 1) of the pressing ring 57. Therefore, each of the pressing screws 61 is rotated, and the tip of each of the pressing screws 61 is fixed to the fixed ring 28a.
The elasticity of each of the compression coil springs 30, 30 can be adjusted by adjusting the amount of protrusion from the inner side surface (the left side surface in FIG. 1).

A lock nut 63 is screwed into a portion of the base end of each of the pressing screws 61 protruding from the outer surface of the fixed ring 28a.
After the elasticity of 0 is adjusted, the pressing screws 61 are prevented from rotating carelessly. In addition, a concave hole may be formed in a portion facing the distal end surface of the short guide rod 29a at the central portion of the distal end surface of each of the pressing screws 61. By forming such a concave hole, the distal end portions of the pressing screw 61 and the guide rod 29a can be freely overlapped with each other, and the compression coil spring 3
The elasticity adjustment range of 0 and 30 can be expanded.

According to the apparatus for pressing a pre-molded insulator configured as described above, the first outer-diameter side tapered surface 23 formed on the pre-molded insulator 21 and the first inner diameter formed on the insulating molded product 8 are formed. A gap between the side tapered surface 22 and a gap between the inner peripheral surface of the pre-mold insulator 21 and the outer peripheral surface of the insulating layer 12 constituting the CV cable 1 are eliminated. 12 can be reliably achieved. That is, by rotating the pressing screws 61 to adjust the distance between the pressing ring 57 and the pressing sleeve 25 and adjusting the elasticity of the compression coil springs 30, 30, the pressing sleeve 25 is The pre-mold insulator 21 is pressed in the axial direction and shrunk inward in the diametrical direction with an appropriate force for pressing the insulator 21 to eliminate the gap between the surfaces.

Further, according to the illustrated pre-mold insulator pressing device, not only the number of assembling work steps on site can be reduced to facilitate the assembling work, but also the outer diameter can be reduced and the installation space can be reduced. . That is, the pressing sleeve 25, the pressing ring 57, the compression coil springs 30, 30, and the guide rod 29
a and 29b can be assembled in a factory or the like in advance in the state shown in FIGS. Also, the fixed ring 28a and the pressing screw 61
Can be pre-assembled at the factory. And, as described above, the work of attaching the fixed ring 28a to the case 2a is performed by rotating the locking portions 50, 50 in the circumferential direction after passing through the notches 52, 52, respectively. Easy to do. For this reason, the work to be performed in the underground common ditch or the like can be reduced.

Further, in the illustrated example, the structure of the portion connecting the conductor 11 and the conductor connector 9 of the CV cable 1 is also different from the conventional structure shown in FIG. That is, the connecting portion has a structure that is easy to attach and detach. However, the structure of this part has nothing to do with the present invention. The structure of this portion is disclosed in detail in Japanese Patent Application No. 11-52633, and even if the structure of this portion is different from that of a prefabricated connection portion (of course, the above-described pressing device for the pre-molded insulator is not used). The present invention is also applicable to a prefabricated connection portion different from the illustrated example), and a detailed description thereof will be omitted.

Next, FIG. 8 shows a second embodiment of the present invention corresponding to claim 2. In the case of this example, the connecting portion between one end (the right end in FIG. 8) of the main body 3b constituting the case 2b and one end (the left end in FIG. 8) of the insulating tube 5a is formed by the connecting tube 64. ing. This coupling cylinder 64
A connecting leg portion 47a corresponding to the first locking portion described in claim 2 is formed on one surface in the axial direction (right surface in FIG. 8). When the insulating tube 5a is injection-molded with an insulating material such as a synthetic resin such as an epoxy resin, the outer half of the connecting leg 47a is separated from the connecting tube 64 and the insulating tube 5a. By being embedded in the cylinder 5a, they are integrally connected. The other half in the axial direction (the left half in FIG. 8) of the connecting cylinder 64 is fitted to one end of the main body 3b so as to be freely displaceable in the axial direction. An O-ring 65 corresponding to the seal ring described in claim 2 is mounted in a locking groove formed in a portion of the outer peripheral surface of one end of the main body 3b which is covered by the other half of the coupling cylinder 64. The ring 65 is elastically sandwiched between the bottom surface of the locking groove and the inner peripheral surface of the other half of the connecting cylinder 64 to seal a fitting portion between the connecting cylinder 64 and the main body 3b. .

On the other hand, the other end (the right end in FIG. 8) of the insulating tube 5a and the second end plate 6a are connected to the first end plate 6a.
With the same structure as in the example, they are integrally connected.
Also, the end of the insulating molded product 8 held in the case 2b is connected to one side surface on the inner diameter side of the second end plate 6a (see the lower part of FIG. 8) as in the case of the conventional structure shown in FIG. Side left side)
Are connected by bolts. The difference in thermal expansion between the case 2b and the insulating molded product 8 due to a temperature change is absorbed by the coupling cylinder 64 being displaced in the axial direction with respect to the main body 3b. Note that, in the illustrated example, the restraining bands 66, 66 are placed between both end portions of the insulating tube 5a and the outer peripheral surfaces of the connecting tube 64 and the second end plate 6a, respectively, and the connecting leg portions 47, Engaging strength between 47a and insulating cylinder 5a is secured. Further, in the case of this example, the pressing means 27 for pressing the pressing sleeve 25 against the pre-mold insulator 21 is configured in the same manner as the conventional structure shown in FIG. Also in the case of such a structure of this example, one end of the insulating tube 5a and the main body 3b
And the outer diameter of the connecting portion between the other end of the insulating cylinder 5a and the second end plate 6a can be reduced.

[0039]

The case of the prefabricated cable connecting portion of the present invention is constructed and operated as described above, so that the installation space can be reduced by reducing the outer diameter of the case. For this reason, it is possible to contribute to the realization of a prefabricated connection portion for a CV cable in which the installation space is small and the assembly work is easy.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first example of an embodiment of the present invention and corresponding to an upper right portion of FIG.

2A and 2B show a cap nut, wherein FIG. 2A is a half-cut side view, FIG. 2B is a view from the left of FIG. 2A, and FIG. 2C is a view from the right of FIG.

FIG. 3 is a perspective view of a fixed ring.

FIG. 4A is a partially omitted illustration of a state during assembly;
-A view.

FIG. 5 is a cross-sectional view taken along the line BB of FIG. 6, taken out of the pressing sleeve, the pressing ring, the guide rod, and the compression coil spring from the same direction as in FIG. 1;

FIG. 6 is a view seen from the right side of FIG. 5;

FIG. 7 is a perspective view of a pressing screw.

FIG. 8 is a partial cross-sectional view showing a second example of the embodiment of the present invention and corresponding to the upper half of FIG. 1;

FIG. 9 is a cross-sectional view showing an example of a prefabricated connection portion for a CV cable incorporating a case having a conventional structure.

FIG. 10 is a sectional view of a connection sleeve.

FIG. 11 is an end view as viewed from the right side of FIG. 10;

FIG. 12 is a sectional view of a pressing and fixing sleeve.

FIG. 13 is an end view as viewed from the right side of FIG. 12;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CV cable 2, 2a, 2b Case 3, 3a, 3b Main body 4 First end plate 5, 5a Insulation cylinder 6, 6a Second end plate 7, 7a Opening 8 Insulation molding 9 Conductor connector 10 Connection recess DESCRIPTION OF SYMBOLS 11 Conductor 12 Insulating layer 13 Shield wire 14 Surface coating 15 Stud 16 Connection sleeve 17 Receiving inclined surface 18 Slit 19 Pressing fixed sleeve 20 Pushing inclined surface 21 Pre-mold insulator 22 First inner diameter side tapered surface 23 First outer Diameter side taper surface 24 Second outer diameter side taper surface 25 Pressing sleeve 26 Second inner diameter side taper surface 27 Pressing means 28, 28a Fixed ring 29, 29a, 29b Guide rod 30 Compression coil spring 31 Nut 32 Lock nut 33 Cover 34 Nut piece 35 Bolt 36 Flange 37 Connection cylinder 38 Male screw 39 Lock groove 40 Engagement recess 41 Engage Part 42 O-ring 43 outward flange part 44 cap nut 45 female screw 46 inward flange part 47, 47a connecting leg part 48 engaging projection 49 engaging cylinder 50 locking part 51 through hole 52 cutout part 53 flat surface 54 screw hole 55 Screw hole 56 Through hole 57 Pressing ring 58 Guide hole 59 Male screw 60 Nut 61 Press screw 62 Locking hole 63 Lock nut 64 Connecting cylinder 65 O-ring 66 Holding band

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Kunihiko Sakura, Inventor Kunihiko Sakurama, 8 Higashi-Mukojima Nishinomachi, Amagasaki City, Mitsubishi Electric Wire & Cable Co., Ltd. F-term (reference) 5G375 AA02 BA27 BB03 BB29 CB05 CB14 CB27 DB22 DB35 EA17

Claims (2)

[Claims] 1. A tubular main body for accommodating a conductor connector for connecting ends of conductors constituting at least one pair of cables and an insulating molded product surrounding the periphery of the conductor connector, and an insulating material. And an insulating cylinder whose one end is connected to one end opening of the main body, and which is fixed to the other end of the insulating cylinder in order to connect a cover to the other end of the insulating cylinder. In the case of the prefabricated connection portion for a cable having an end plate, a connecting portion between one end of the main body and one end of the insulating cylinder is connected to a portion of the main body to which the insulating cylinder is to be connected. A male screw formed on the outer peripheral surface of the formed cylindrical portion,
An outward flange formed in a state protruding diametrically outward on one end outer peripheral surface of the insulating cylinder, and a female screw which is formed in a substantially cylindrical shape and is screwed to the male screw on one half inner peripheral surface thereof, Inward flanges that engage with the outward flange on the inner peripheral surface of the end and press the outward flange toward one end surface of the main body are provided with cap nuts provided respectively. The end portion and the end plate are connected by embedding a locking portion formed on a part of the end plate in the insulating tube when the insulating tube is formed. Prefabricated connection case for cable. 2. A cylindrical main body for accommodating a conductor connector for connecting ends of conductors constituting at least one pair of cables and an insulating molding surrounding the periphery of the conductor connector, and an insulating material. And an insulating cylinder whose one end is connected to one end opening of the main body, and which is fixed to the other end of the insulating cylinder in order to connect a cover to the other end of the insulating cylinder. In the case of the prefabricated connection portion for a cable having an end plate, a connecting portion between one end of the main body and one end of the insulating tube is formed in a part of the insulating tube when the insulating tube is formed. A coupling tube connected by embedding the first locking portion in the insulating tube is freely displaceable in the axial direction with a seal ring interposed between the peripheral surfaces at one end of the main body. The other end of the insulating cylinder and the end plate form the insulating cylinder. A case of a prefabricated cable connection portion, wherein a locking portion formed on a part of the end plate is connected by being embedded in the insulating tube.