KR101436678B1 - Stress cone compression device and cable connection section using same - Google Patents

Abstract

The stress cone compression device is simplified, miniaturized and lightweighted. The stress cone compressing device of the present invention is a stress cone compressing device comprising a cylindrical presser member having a trumpet-shaped tapered portion which is pierced toward the front end portion in the inner periphery of the front end portion, and a rear end surface of the rear end surface of the presser member, And a plurality of first shafts which penetrate the washer and the press fitting flange and are fixed to the rear end of the press fitting, A coil spring fitted to the outer periphery of the first shaft and having a distal end surface abutting against the rear end surface of the presser foot and a rear surface abutting against the distal end surface of the washer, A plurality of second shafts passing through the washer and fixed to the pressing metal flange, and a plurality of second shafts penetrating the washer and fixed to the pressing metal flange, And a government material.
[Representative view] Fig. 1

Description

TECHNICAL FIELD [0001] The present invention relates to a stress cone compression device and a cable connecting device using the same,

The present invention relates to a stress cone compressing apparatus and a cable connecting unit using the apparatus, and more particularly, to a stress cone compressing apparatus having an over-compressing function and a cable connecting unit using the apparatus.

Generally, in a cable terminal connection portion of an ultra high-pressure CV cable (crosslinked polyethylene cable), a stress cone provided on a cable insulator is pressed toward an axial front end portion, thereby applying pressure to the interface between the stress cone and the terminal insertion portion of the epoxy bushing have.

However, in the cable terminal connection portion having the same structure, the higher the rated voltage is, the longer the interface between the stress cone and the terminal insertion portion becomes, and the smaller the void is liable to remain at this interface. As the rated voltage becomes higher, It is necessary to take care not to leave it.

From this point of view, for example, in a terminal connection portion of an ultra high-pressure CV cable of 220 kV or more, stress coins are over-compressed before fully assembled as a cable terminal connection portion to actively remove fine voids at the interface, .

FIG. 9 is a longitudinal sectional view of a conventional stress cone compressing apparatus, and FIG. 10 is a partial longitudinal sectional view of a cable terminal connecting unit using the stress cone compressing apparatus.

9, a conventional stress cone compressing device comprises a cylindrical pressurizing pipe (not shown) having a trumpet-shaped tapered portion 111 which is diametrically opposed to the front end portion (the upper end in the drawing, Shaped insulating tubular flange 120 fitted to the outer periphery near the rear end (lower end in the figure) of the pressurizing pipe 110, and a ring- And a cylindrical flange 131 protruding toward the rear end of the pressing pipe 130. The cylindrical pressing member 130 has a cylindrical flange 131 protruding toward the rear end of the pressing pipe 110, Shaped washer 140 which is installed on the rear end side of the spring 200 and which supports the rear end side of the spring 200 to be described later so as to be disposed on the flange 131 of the pressing metal fitting 130 through the washer 140, A plurality of fixed first shafts 150, a washer 140, A plurality of second shafts 160 fixed to the flange 131 of the first shaft 150 and the second shaft 160 so as to be arranged along the circumferential direction and a coil spring 200 And a plurality of third shafts 170 passing through the washer 140 and fixed to the insulating tubular flange 120. The plurality of third shafts 170 are connected to an epoxy bushing 10) than the inner diameter of the receiving port 240 (see FIG. 10) of the inner case 220 (see FIG. 10) (see Patent Documents 1 to 4, for example).

A nut 161 for presetting the spring 200 is screwed on the outer circumference of the rear end of the second shaft 160. The second shaft 160 having the presetting function has a nut 1 shafts 150 of the first embodiment.

Further, two nuts 171 and 172 for screwing up the washer 140 toward the front end portion are screwed to the outer periphery of the rear end of the third shaft 170.

The compression spring 130 and the spring 200 are assembled and fixed by using the first shaft 150 and the second shaft 160 and the nut 160 The spring 200 is given a presetting load.

As shown in Fig. 10, the pre-set stress cone compressing apparatus is sandwiched by inserting the insulating tubular flange 120 around the periphery of the rear end of the pressurizing pipe 110, The insulating tube flange 120 is fixed to the rear end of the epoxy bushing 220 through the insulating tube 210 by inserting the inner circumference of the pressurizing pipe 110 into the outer circumference of the washer 132, Tightening the two nuts 171 and 172 screwed on the rear end side of the washer 140 of the third shaft 170 whose tip end is fixed to the insulating tube flange 120 pushes the washer 140 toward the front end The spring 200 is further compressed and an overpressure axial force is applied to the spring 200.

According to such a stress cone compressing apparatus, by fixing the stress cone compression apparatus preliminarily set using the third shaft 170 to the insulating cylinder flange 120 and tightening the nuts 171 and 172, A compression force (overpressure axial force) can be imparted, but the following problems have been encountered.

First, the plant is assembled as shown in Fig. 9 by using the press fitting 130, the washer 140, the first shaft 150, the second shaft 160, and the nut 161, It is necessary to mount it on the bushing 220 as shown in Fig. 10 by using the pressure pipe 110, the insulating barrel flange 120, the third shaft 170 and the nuts 171 and 172, The structure of the stress cone compressing apparatus 100 is complicated because the portion where the cone compressing apparatus 100 is assembled at the factory and the portion where the cone compressing apparatus 100 is installed at the factory are separated.

Second, three types of first shaft 150, second shaft 160, and third shaft 170 are required, and it is necessary to carefully carry out the overpressure shafts under the field management.

Third, since the number of parts is large, it takes time to preset the stress cone compressing apparatus 100 and to install the stress cone compressing apparatus 100 on the bushing 220 in the field.

Fourthly, since the third shaft 170 is arranged on the outer circumference of the first shaft 150 and the second shaft 160 arranged in the circumferential direction along the circumferential direction, The outer diameter of the stress-relief compressing apparatus 100 becomes large and the outer diameter of the cable terminal connecting portion becomes large.

Fifth, since the third shaft 170 is disposed outside the inner diameter of the receiving port 240 of the epoxy bushing 220 for inserting the cable terminal, the outer diameter of the stress cone compressing apparatus 100 is increased, The outer diameter of the terminal connection portion becomes large.

Sixth, the components such as the first shaft 150, the second shaft 160, and the third shaft 170 except for the pressure pipe 110 of the stress cone compression apparatus 100 are protruded to the rear end side of the bushing 220 The axial length of the first shaft 150, the second shaft 160, and the third shaft 170 is increased by the portion where the first shaft 150, the second shaft 160, and the third shaft 170 are installed so as to protrude. In addition, The length becomes longer.

[Patent Literature]

[Patent Document 1] JP-A-9-224325 (Figs. 6 and 7)

[Patent Document 2] Japanese Utility Model Publication No. 6-077439 (Fig. 1)

[Patent Document 3] JP-A-9-023559 (Figs. 2 and 3)

[Patent Document 4] Japanese Utility Model Laid-Open Publication No. 5-15629 (Fig. 1)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stress cone compression device which can be simplified in size, size and weight, and which can be easily assembled in the field, and a cable connecting portion using the device. .

A stress cone compression apparatus according to a first aspect of the present invention is a stress cone compression apparatus having a cylindrical presser member having a trumpet-shaped tapered portion which is diametrically expanded toward the front end portion in the inner periphery of a tip end portion, A ring-shaped washer which is provided on the rear end surface of the bushing or the insulating barrel and spaced apart from the rear end surface side of the pressing metal flange, and a washer which penetrates the washer and the press fitting flange, A coil spring which is fitted on an outer periphery of the first shaft and whose front end faces the rear end face of the pressing metal fitting and whose rear end faces the front end face of the washer; A plurality of second shafts fixed to the pressing metal flange, and a gap adjusting member for adjusting the distance between the pressing metal flange and the washer.

In a stress cone compression apparatus according to a second embodiment of the present invention, a plurality of first shafts and a plurality of second shafts are arranged to be accommodated within a range of an inner diameter of a terminal insertion portion provided in a bushing or an insulating cylinder It is.

In a third aspect of the present invention, in the stress cone compressing device according to the first or second embodiment, at least two of the plurality of first shafts are provided with a head portion at the rear end thereof.

In a fourth aspect of the present invention, in the stress cone compressing device according to any one of the first to third aspects, the protruding portion is provided on the outer periphery of the vicinity of the distal end portion of the second shaft, And is in contact with the rear end face of the flange.

In a fifth aspect of the present invention, in the stress cone compressing device according to the fourth aspect, a smooth portion is provided on the outer periphery of the projecting portion.

In a sixth aspect of the present invention, in the stress cone compressing device according to any one of the third to fifth aspects, a recessed portion capable of receiving the head portion of the first shaft is provided at the rear end side of the washer .

In a seventh aspect of the present invention, in the stress cone compressing device according to any one of the fourth to sixth aspects, the marking offline is displayed on the outer periphery of the rear end side of the projection of the second shaft.

According to an eighth aspect of the present invention, in the stress cone compressing device according to any one of the first to seventh embodiments, a through hole for passing the first shaft is provided at a predetermined interval on the inner circumferential side of the washer And a through hole for passing the second shaft is provided at a predetermined interval on the outer peripheral side of the washer.

A cable connecting portion according to a ninth embodiment of the present invention includes a cable terminal portion having a stress cone mounted on a cable insulator and a stress cone compressing device according to any one of the first to eighth embodiments, The tapered portion of the pressing metal constituting the device is in contact with the tapered portion of the semiconductive portion constituting the stress cone.

In a tenth embodiment of the present invention, in the cable connecting portion according to the ninth embodiment, a cable protecting bracket constituting a cable terminal portion is mounted on a rear end surface of a press fitting flange constituting a stress cone compressing device.

The stress cone compression apparatus according to the first to eighth embodiments of the present invention has the following effects.

First, since the compression portion (press fitting, washer, etc.) and the mounting portion (press fitting flange or the like) in the bushing or the insulation tube are integrally constituted by the first shaft and the second shaft, The size and weight can be reduced.

Second, in the factory, it is possible to obtain the pre-setting state of the spring only by fixing the press fitting and the washer through the first shaft in advance, so that it is possible to constitute the pre-setting state in which the dimension management is not required.

Third, since the number of springs and shafts can be significantly reduced compared with the conventional stress cone compressing apparatus while having the same compression function as the conventional stress cone compressing apparatus, the number of parts can be greatly reduced.

Fourth, since all of the shafts (the plurality of first shafts and the second shafts) are arranged to be accommodated within the range of the inner diameter of the terminal insertion portion provided in the bushing, the outer diameter of the stress cone compression device can be reduced.

Fifth, when the first shaft (shoulder bolt) having the same structure is passed through the second through-hole, compared with the conventional stress cone compressing device using three kinds of shafts, two types of shafts can solve the problem. It is possible to greatly reduce the number of parts and further simplify the assembling of the field assembly and also to assemble the stress cone compressing device having the over compressing function.

Sixth, since the free length of the spring can be shortened by about 30% as compared with the conventional stress cone compressing device, the axial length of the stress cone compressing device can be shortened.

Seventh, when the smooth portion is provided on the protruding portion of the second shaft, the smooth portion can be fitted and fixed by a spanner or the like. Therefore, the adjustment operation (tightening or unscrewing the nut) of the first nut and the second nut, Can be easily adjusted.

The cable connecting portion (terminal connecting portion) of the ninth or tenth embodiment has the following effects.

First, since the number of parts is small, the cable terminal connection portion can be assembled easily.

Second, since the first and second nuts are tightened to the position where the front end face of the washer abuts against the rear end face of the projection, a predetermined over-compression state can be constituted. It can be easily configured.

Third, the stress cone compression device pre-set at the rear end of the bushing is fixed, the washer is fixed at a predetermined position (a position where the washer contacts the rear end face of the protrusion), a stress cone is applied to the stress cone for a predetermined time, The stress cone compressing device can be mounted in a state in which the spring can be recognized from the outside. Therefore, in the work step of applying the overpressure axial force, You can visually confirm how much the springs can be turned, and it is easier to check if you want to check the dimensions. Thereby, it is not necessary to manage the dimensions from the pre-setting state at the time of shipment to the over-compression state and the assembled state at the field by a measuring instrument, etc., and the stress cone compressing device can be assembled easily.

Fourthly, since all of the shafts (the plurality of first shafts and the second shafts) are arranged to be accommodated within the range of the inner diameter of the terminal insertion portion provided in the bushing, the front end side of the first shaft including the press fitting and the plurality of springs The axial length of the cable terminal connection portion can be shortened by the portion of the first shaft including the press fitting and the plurality of springs is received in the terminal insertion portion of the bushing, have.

Fifth, in the case where the depressed portion is provided on the rear end side of the washer, workability can be improved because the first shaft does not interfere with the adjustment to the overcompressed state by the gap adjusting member or the adjustment to the assembled state.

Sixth, in the case where the marking offline is displayed on the second shaft, it is possible to easily perform a compressing force applying operation up to the use state after the over-compression operation.

Seventhly, in the case where the second through hole is formed on the inner peripheral side of the washer to penetrate the first shaft and the third through hole is formed on the outer peripheral side to penetrate the second shaft, The adjusting operation of the first nut and the second nut can be performed.

1 is a partial vertical cross-sectional view (a view taken along the line A'-OA in Fig. 2) of the stress cone compressing device according to the present invention.
2 is a half cut-away plan view of a press fitting flange in the stress cone compression apparatus of the present invention.
3 is a plan view of a washer in the stress cone compression apparatus of the present invention.
4 is a front view of the second shaft in the stress cone compression apparatus of the present invention.
5 is an explanatory diagram showing a spring free path, a number, and the like in the stress cone compressing device of the present invention, together with a comparative example.
6 is a partial longitudinal cross-sectional view of a cable terminal connection portion using the stress cone compression apparatus of the present invention.
7 is a partial longitudinal cross-sectional view (along the line A'-OA in Fig. 2) of the stress cone compressing apparatus showing the over-compression state of the spring according to the present invention.
8 is a plan view showing another embodiment of the washer according to the present invention.
9 is a partial longitudinal cross-sectional view of a conventional stress cone compression apparatus.
10 is a partial longitudinal cross-sectional view of a cable terminal connection portion using a conventional stress cone compression device.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the stress cone compressing device and the cable connecting portion of the present invention will be described with reference to the drawings. Hereinafter, the term " front end (front end face) " of the bushing, the stress cone, the pressure fitting, the press fitting flange, the washer, the first shaft, the second shaft, (Back end face) "of the bushing, the stress cone, the press fitting, the press fitting flange, the washer, the first shaft, the second shaft, the protrusions and the spring corresponds to the upper direction in the drawings, (End face) on the opposite side to the end face (end face), respectively, and will be described as corresponding to the downward direction in the drawing.

[Example 1]

1 is a longitudinal sectional view of a stress cone compressing apparatus of the present invention suitable for a gas end connecting portion (cable connecting portion) of a 220 kV class ultra high pressure CV cable.

1, the stress cone compressing device 1 of the present invention comprises a press fitting 2 made of a cylindrical aluminum alloy or the like and a press fitting 2 spaced apart from the rear end face of the press fitting 2 by a predetermined length, Like annular aluminum alloy or the like which is concentrically provided on the rear face of the pressing metal flange 3 and a ring-shaped metal ring 3 which is spaced apart from the rear face of the pressing metal flange 3 by a predetermined length and which is provided concentrically with the pressing metal 2 A plurality of shafts 5 (hereinafter referred to as "first shafts") which penetrate through the washer 4 and the press fitting flange 3 and are fixed to the rear end of the pressing metal 2, A coil spring 7 which is fitted on the outer periphery of the first shaft 5 and whose distal end faces the rear end face of the pressing metal 2 and whose rear end faces the front end face of the washer 4, A plurality of shafts 6 (hereinafter, referred to as "second shafts") that are fixed to the press fitting flange 3 through the washer 4 Hereinafter), a and a screw coupled to spacing member 8 on the outer peripheral side of the end portion after the washer 4 of the second shaft (6).

The pressing metal fitting 2 has a cylindrical portion 21 having a thickness approximately equal to or slightly larger than the outer diameter of a spring 7 to be described later, A plurality of screw holes 23 (hereinafter referred to as "first screw holes") for screwing the tip end portion of the first shaft 5 are provided in the rear end side in the circumferential direction As shown in FIG. In this embodiment, for example, twelve first screw holes 23 are arranged on the same circumference on the same circumference. The outer diameter of the press fitting 2 is substantially equal to the outer diameter of the upper portion of the stress cone 14 described later and is accommodated in the terminal insertion portion 12 (see Fig. 6) of the bushing 11 .

2, a plurality of semicircular notch portions 31 for inserting a first shaft 5 and a spring 7 to be described later are formed on the inner circumferential side of the press fitting metal flange 3 by a circumferential line 31a, And are disposed at predetermined intervals along the circumferential direction. On the circumferential line 32a having a diameter slightly larger than the circumferential line 31a between the adjacent notch portions 31, there is provided a screw portion 32a for screwing the distal end portion of the shaft 6 (hereinafter referred to as "second shaft" A plurality of second screw holes 32 are arranged on the back side along the circumferential direction. In this embodiment, for example, twelve notch portions 31 and twelve second screw holes 32 are provided so as to be alternately arranged back-to-back along the circumferential direction. The radius of the notch 31 is slightly larger than the radius of the spring 7. A plurality of non-penetrating screw holes 34 are formed on the outer circumferential side of the pressing metal flange 3 for screwing the tip end of a bolt V1 (hereinafter referred to as "first bolt" A plurality of through holes 33 (hereinafter, referred to as "first through holes ") for passing through a bolt V2 (hereinafter referred to as a" second bolt " Quot; ball ") is arranged on the circumferential line 34a in the circumferential direction. In this embodiment, ten third screw holes 34 and ten first through holes 33 are provided so as to be alternately arranged back-to-back along the circumferential direction. The outer diameter of the pressing metal flange 3 is larger than the outer diameter of the pressing metal 2 and smaller than the outer diameter of the rear end of the bushing 11 to be described later and the inner diameter is smaller than the outer diameter of the pressing metal 2 have.

A shaft having a head portion made of stainless steel (for example, a shoulder bolt) is used as the first shaft 5, and a shaft having a round bar shape having no head portion made of stainless steel is used as the second shaft 6.

Fig. 3 shows a plan view of the washer 4. Fig. 3, a plurality of through holes 41 (hereinafter referred to as "second through holes") for penetrating the first shaft 5 are formed on the circumferential line 41a on the slightly inner peripheral side from the center circle of the washer 4 Are arranged so as to be equally spaced in the circumferential direction. A plurality of through holes 42 (hereinafter referred to as "third through holes") for penetrating the second shaft 6 are formed on a circumferential line 42a slightly outside of the center circle of the washer 4 And are arranged so as to be arranged in the circumferential direction. In this embodiment, twelve second through holes 41 and twelve third through holes 42 are provided so as to be alternately arranged back-to-back along the circumferential direction. A depression 43 capable of receiving the head portion 51 of the first shaft 5 is formed concentrically with the second through hole 41 and communicated with the second through hole 41 at the rear end side of the washer 4, Respectively. The outer diameter and the inner diameter of the washer 4 are slightly larger than the outer diameter and inner diameter of the pressing metal 2, respectively.

Fig. 4 shows a front view of the second shaft 6. Fig. 4, the second shaft 6 is provided with threaded portions 6a and 6b on the front end side and the rear end side, and on the outer periphery in the vicinity of the front end portion, protrusions 9 for positioning the pressing metal flange 3 And the marking off-line 61 is previously displayed on the outer periphery of the rear end side of the projection 9. A smooth portion 9a for fastening a spanner or the like to be described later is provided on the outer periphery of the projection 9. In this embodiment, a hexagonal smoothing portion 9a such as a hexagonal nut is provided as the projection 9.

The gap adjusting member 8 includes a nut 81 having a long shaft length which is screwed to the side opposite to the washer 4 (hereinafter referred to as a "first nut") and a rear end side And a washer 83 is provided between the first nut 81 and the second nut 82. The first nut 81 and the second nut 82 are provided with a washer 83. [

Next, a method of assembling the stress cone compressing device 1 of the present invention will be described.

First, the second shaft 6 is inserted into the third through hole 42 of the washer 4, the tip of the second shaft 6 is screwed into the second screw hole 32, and the second shaft 6 6 are brought into contact with the rear end face of the pressing metal flange 3 so that the pressing metal flange 3 is positioned at a predetermined position and the second shaft 6 and the pressing metal flange 3 3) are integrally fixed by a screw lock. Thus, by loosening or tightening the first nut 81 and the second nut 82 to be described later, the second shaft 6 and the press fitting flange 3 move integrally.

Next, the first shaft 5 is inserted into the notched portion 31 of the second through hole 41 of the washer 4 and the press fitting flange 3, and the spring 7 is inserted into the first shaft 5, The distal end portion of the first shaft 5 is screwed into the first screw hole 23. Then, as shown in Fig. Then, by tightening the first shaft 5, the spring 7 is inevitably compressed until it is in a preset state. Thus, the washer 4, the press fitting flange 3 and the press fitting 2 are integrated with each other via the first shaft 5, and at the same time, the spring 7 is given a predetermined preset load. Thus, the presetting operation of the spring 7 at the factory is completed. As described above, in the factory, since the presetting state of the spring 7 can be obtained by simply fixing the pressing tool 2 and the washer 4 to the spring 7 by the first shaft 5, An unnecessary pre-setting state can be configured. In this case, the press fitting metal flange 3 is fixed between the press fitting 2 and the washer 4 via the second shaft 6, but may be fixed at any position.

5 is an explanatory diagram showing a free path and a number of springs of a stress cone compressing device in a cable terminal connecting portion (see Fig. 6) to be described later together with a comparative example (a conventional cable terminal connecting portion shown in Fig. 10). Here, the "free length" in Fig. 5A is the original length of the spring in a state in which no load is applied to the spring, and is 30% shorter than the conventional length in the present embodiment . As shown in Fig. 5C, "all deflection" is a bending dimension in a state where the spring is compressed to the maximum, and is the same as the conventional full bending in this embodiment. The "number" is the number of springs used in the stress cone compressing device. In this embodiment, the number of conventional springs is reduced by about 25%. The term "compressive load" is a total load of the stress cone compressing device in an actually used state after assembling a cable terminal, and is substantially equal to the load at the time of the conventional compression in the present embodiment.

In addition, although not particularly shown in FIG. 5A, it has been confirmed by the applicant's test that the level of the overpressure force can be maintained substantially equal to that of the conventional stress cone compressing apparatus even in the stress cone compressing apparatus according to the present embodiment.

Therefore, in the stress cone compressing apparatus according to the present embodiment, it is possible to maintain a level of compressive force or overpressure compressive force substantially equal to that of the conventional stress cone compressing apparatus. In addition, according to the stress cone compressing apparatus according to the present embodiment, The number of the springs can be reduced by about 25% as compared with the stress cone compressing device, and accordingly, the number of the first shafts 5 can be greatly reduced.

As described above, the stress cone compression apparatus of the present invention has the following effects.

First, a pressing portion (press fitting 2, a washer 4, etc.) and a mounting portion (press fitting flange 3 or the like) to a bushing 11 to be described later are attached to the first shaft 5 and the second shaft 6 The stress cone compressing device can be simplified, downsized and lightened.

Secondly, in the factory, since the presetting state of the spring 7 can be obtained only by fixing the pressing tool 2 and the washer 4 to the spring 7 by the first shaft 5 in advance, It is possible to configure an unnecessary pre-setting state.

Thirdly, since the number of springs and shafts can be significantly reduced compared with the conventional stress cone compressing apparatus while having the over-compression function substantially equivalent to that of the conventional stress cone compressing apparatus, the number of parts can be greatly reduced.

Fourth, since all the shafts (the plurality of first shafts 5 and the second shafts 6) are arranged to be accommodated within the range of the inner diameter of the terminal insertion portion 12 provided in the bushing 11, The outer diameter of the device can be reduced.

Fifth, compared to the conventional stress cone compressing apparatus using three kinds of shafts, since the two types of shafts of the first shaft 5 and the second shaft 6 are solved, the number of parts can be greatly reduced, Assembly of the stress cone compressing device having an over-compression function can be easily performed.

Sixth, since the free length of the spring can be shortened by about 30% as compared with the conventional stress cone compressing device, the axial length of the stress cone compressing device can be shortened.

Seventhly, when the smooth portion 9a is provided on the protruding portion 9 of the second shaft 6, since the smooth portion 9a can be fixed with a spanner or the like, the first nut 81 and the second nut (The operation of tightening or unscrewing the nut) of the pressing metal flange 82, that is, the position of the pressing metal flange 3 can be easily adjusted.

[Example 2]

6 is a partial vertical cross-sectional view showing an example of a terminal connection portion in a gas of a 220 kV-class high-pressure CV cable using the stress cone compression apparatus of the present invention. In FIG. 6, the parts common to FIG. 1 are denoted by the same reference numerals and the detailed description is omitted.

6, the cable terminal connection portion of the present invention includes a device case 10 for hermetically accommodating power devices (not shown) such as switches and transformers, A cable terminal portion 13 plugged in a terminal insertion portion 12 provided in the bushing 11 and a cable terminal portion 13 which is mounted on the cable insulator 13a of the cable terminal portion 13 And the stress cone compression device (1) of the present invention for pressing the stress cone (14) toward the axial front end.

The bushing 11 has a head portion 11a having a bullet shape at its tip end and an insulating portion 11d to be described later at a rear end portion. The bushing 11 has a disc-like shape protruding outward in the radial direction on the outer periphery in the vicinity of the insulating portion 11d And a flange 11b is provided. A shielding portion 11c is provided at the connection portion between the head portion 11a and the flange 11b and the shielding portion 11c is provided on the outer periphery of the shielding portion 11c at a position reaching the upper end surface of the flange 11b, A conductive paint such as a paint is applied to a position where the flange 11b is located and an insulating portion 11d having a function as an insulating cylinder is provided on the rear end side of the flange 11b.

The terminal insertion portion 12 is provided toward the inner side portion (distal end portion of the bushing 11) of the rear end surface (rear end surface of the insulating portion 11d) of the bushing 11 and accommodates the stress cone 14 (The rear end side of the insulating portion 11d) of the bushing 11 and the front end portion (the press fitting 2 and the spring 7) of the stress cone compressing device are provided on the inner side accommodating portion 12a, And the inlet side accommodating portion 12b is concentric with the inside side accommodating portion 12a and the inside side accommodating portion 12a (the front end of the mounted first shaft 5) As shown in Fig.

The insulating portion 11d having the function as the insulating cylinder for insulating the bushing 11 and the cable ground of the apparatus from this configuration is made of a hard insulator such as an epoxy resin and has an inner conductor And is molded integrally with the filler metal 11e.

An internal conductor (not shown) made of copper or a copper alloy is buried in the center of the head portion 11a of the bushing 11 concentrically with the head portion. The outer diameter of the shielding portion 11c of the bushing 11 is smaller than the inner diameter of the opening 10a of the equipment case 10 and the outer diameter of the flange 11b is smaller than the outer diameter of the opening 10a of the equipment case 10. [ And is formed larger than the inner diameter. Further, the front end portion of the inner conductor is protruded from the upper portion of the head portion 11a, and a conductor insertion hole (not shown) is provided at the rear end portion of the inner conductor. The conductor insertion hole communicates with the inner side receiving portion 12a .

The cable terminal portion 13 is provided with a cable insulator 13a and a cable conductor (not shown) exposing the ends of the CV cable in a stepwise manner and exposed. The cable insulator 13a is provided with a cable outer semiconductive layer The stress cone 14 is mounted on the shielding treatment layer 13c provided on the upper surface 13a and the lower surface 13b of the cable conductor 13. A conductor terminal (not shown) is attached to the distal end of the cable conductor. The stress cone 14 is composed of an insulating portion 14a and a semiconductive portion 14b having rubber elasticity such as ethylene propylene rubber (EP rubber) or silicone rubber, Shaped conical portion 141 mounted on the inner wall surface of the inner side accommodating portion 12a is provided at the rear end portion of the semi- conductive portion 14b and the inner surface of the tapered portion 22 of the press- A tapered portion 142 corresponding to the wall surface is provided.

In the figure, reference numeral 11e denotes a filler metal buried so as to be arranged backwardly in the circumferential direction at the rear end of the bushing 11, 13d denotes a cable protective metal made of an aluminum alloy steel or the like surrounding the cable terminal, 13e denotes a ground wire, And O2 is an O-ring. In addition, a method layer (not shown) is provided from the rear end of the cable protective metal 13d to the cable sheath.

Next, a method for assembling the cable terminal connecting portion of the present invention having the above-described structure will be described.

The head portion 11a of the bushing 11 is positioned in the equipment case 10 and the upper surface of the flange 11b of the bushing 11 is brought into contact with the outer wall of the equipment case 10, The bushing 11 is hermetically mounted to the device case 10 by fixing of the bolt.

Next, the cable terminal portion 13 is inserted into the bushing 11, the conductor terminal is plug-connected to the conductor insertion hole, and the stress cone compressing device 1 previously fitted in the cable is placed in a predetermined position Turn it.

Then the front end face of the pressing metal flange 3 of the stress cone compressing device 1 is brought into contact with the rear end face of the bushing 11 (the rear end face of the insulating portion 11d) A second bolt V2 is inserted into the first through hole 33 of the bushing 11 and the second bolt V2 is attached by screwing the tip end of the second bolt V2 to the fillet metal piece 11e of the bushing 11. Thereby, the stress cone compression apparatus 1 is hermetically mounted to the rear end of the bushing 11 (the rear end of the insulating portion 11d) through the O-ring O1.

Next, by fastening the first nut 81 and the second nut 82 as the gap adjusting member 8 while fixing the protruding portion 9 (smooth portion 9a) of the second shaft with a spanner or the like, 7, the washer 4 is pushed up so that the front end face of the washer 4 is fitted to the rear end face of the projection 9. As a result, a predetermined overpressure force is applied to the spring 7, and a predetermined overpressure force is applied to the stress cone 14. In addition, by holding the state in which this compression is applied for a predetermined time, the microvoids at the interface between the stress cone 14 and the terminal insertion portion 12 can be positively eliminated.

The first nut 81 serving as the gap adjusting member 8 is fixed while holding the protruding portion 9 (smooth portion 9a) of the second shaft with a spanner or the like, as described above, The first nut 81 and the second nut 82 are loosened so that the front end face of the washer 4 is lowered to the marking off line 61 position of the second shaft 6, . Thereby, the compression force of the spring 7 can be made weak to the use state.

Next, the cable protection metal fitting 13d sandwiched in advance to the cable terminal portion 13 is returned to a predetermined position, and the flange 13f provided at the tip end portion of the cable protection fitting 13d is pressed against the rear end of the pressing metal flange 3 And the both are fastened by the first bolt (V1).

As described above, the cable terminal connection portion of the present invention has the following effects.

First, since the number of parts is small, the cable terminal connection part can be assembled easily.

Secondly, since the first nut 81 and the second nut 82 are tightened to a position where the front end surface of the washer 4 abuts against the rear end surface of the projection 9, It is possible to easily configure the compression state and the compression state without managing the dimensions with a ruler or the like.

Third, the stress cone compression apparatus 1 preset at the rear end of the bushing 11 is installed and the washer 4 is fixed at a predetermined position (a position where it abuts the rear end surface of the projection 9) Since the washer 4 is returned to the predetermined position (the position of the marking off line 61) and the cable protection metal fitting 13d is provided after applying the overpressure axial force to the spring 14 for a predetermined time, It is possible to visually confirm how much the spring 7 can be rotated at the stage of the work of applying the overpressure axial force, It is possible to facilitate the confirmation even when it is desired to confirm. Thereby, it is not necessary to manage the dimension from the pre-setting state at the time of shipment to the over-compression state and the assembled state at the field by a measuring instrument, etc., and the stress cone compressing apparatus 1 can be easily assembled.

Fourth, since all of the shafts (the plurality of first shafts 5 and the second shafts 6) are arranged to be accommodated within the range of the inner diameter of the terminal insertion portion 12 provided in the bushing 11, And the tip end side of the first shaft 5 including the plurality of springs 7 can be accommodated in the end insertion portion 12 of the bushing 11 and furthermore, The axial length of the cable terminal connection portion can be shortened by the portion of the distal end of the first shaft 5 including the distal end portion 7 of the bushing 11 accommodated in the distal end insertion portion 12 of the bushing 11. [

Fifthly, when the depressed portion 43 is provided on the rear end side of the washer 4, it is possible to prevent the first shaft 5 from being deformed by the gap adjusting member 8 during the adjustment to the over- So that the workability can be improved.

Sixth, in the case where the marking off-line 61 is displayed on the second shaft 6, it is possible to simplify the work of applying the compression force to the use state after the over-compression operation.

Seventhly, a second through hole 41 for penetrating the first shaft 5 is provided on the inner peripheral side of the washer 4, and a third through hole 41 for passing the second shaft 6 through the outer peripheral side is provided. The adjustment of the first nut 81 and the second nut 82 can be performed without interference of the first shaft 5.

[Example 3]

8 shows another embodiment of the washer according to the present invention. In FIG. 8, the parts common to FIG. 3 are denoted by the same reference numerals, and a detailed description thereof will be omitted.

In this embodiment, a plurality of shafts (for example, shoulder bolts) having a head portion as a first shaft 5 are passed through a circumferential line 41a which is slightly circumferentially spaced from the center circle of the washer 4 A plurality of through holes 41 '(hereinafter referred to as "fourth through holes") for passing through the second through hole 41 and a round rod shaft having no head portion as the first shaft 5, As shown in FIG. In this embodiment, six second through holes 41 and six fourth through holes 41 'are provided so as to be alternately arranged in the circumferential direction. The inner diameter of the fourth through-hole 41 'is the same as the inner diameter of the second through-hole 41, and the depressed portion 43 is not provided in the fourth through-hole 41'.

According to the washer having such a construction, a shaft (shoulder bolt) having a head portion as a first shaft 5 is passed through the second through hole 41, and a shaft (shoulder bolt) as a first shaft 5 is inserted into the fourth through hole 41 ' The number of the shafts (shoulder bolts) having the head portion can be reduced, and the number of the shafts (shoulder bolts) having the head portion can be made smaller than that of the washer shown in Fig. It is possible not only to reduce the work of tightening the shaft (shoulder bolt) having the head portion by the reduced portion, that is, the work for setting it in the preset state, but also the cost is reduced.

Industrial availability

While the present invention has been described with reference to the specific embodiments shown in the drawings, the present invention is not limited to these embodiments and may be configured as follows as long as the effects of the present invention can be obtained.

The first shaft 6 is formed integrally with the protruding portion 9 and the second shaft 6 but the second shaft 6 is provided with a separate nut · Fixed ones may be used.

Secondly, in the second embodiment described above, the case has been described in which the press fitting flange 3 is attached to the rear end surface of the insulating portion 11d having the function as an insulating cylinder integrated with the bushing 11. However, The press fitting metal flange 3 may be mounted on the rear end face of the bushing or the rear end face of the separate insulating case separate from the bushing 11. [

Third, in the above-described first and third embodiments, when a shaft (shoulder bolt) having head portions as twelve and six first shafts 5 is passed through the second through holes 41 of the same number A shaft (shoulder bolt) having a head portion as a first shaft is passed through at least two second through holes 41, and the remaining second through hole 41 or fourth through hole 41 ' A shaft of a round rod shape having no head portion may be passed through as a first shaft. However, the shaft (shoulder bolt) having the head portion needs to be arranged in the circumferential direction (for example, when two are used, the shaft is arranged at an angle of 180 degrees). Thereby, a predetermined preset state can be obtained. When the first shaft having four or more head portions is arranged on the back, the washer 4 can be pressed to the tip end more evenly, so that the spring can be compressed evenly to the preset position. The shaft having the head portion is not limited to the shoulder bolt, but may be another bolt having the head portion.

Fourth, in the above-described embodiment, the first nut 81 having the long shaft length is used as the first nut 81, but a nut having the same configuration as the second nut 82 may be used.

Fifthly, in the above-described embodiment, the first nut 81 and the second nut 82 are screwed to all the second shafts 6, but only one nut may be screwed. The grounding line 13e may be attached to all the gap adjusting members 8 or the gap adjusting members 8 at a plurality of positions.

Sixth, the pressing metal fitting 2, the pressing metal flange 3, and the washer 4 are not limited to those formed of an aluminum alloy, but may be formed of a metal such as copper, copper alloy, or aluminum.

Seventh, although the above-described embodiment is applied to a gas end connection portion as a cable connection portion, it may be applied to an oil end connection portion and a gas end connection portion, or to an intermediate connection portion (joint). Furthermore, the shape of the cable connecting portion is not limited.

Eighth, in the above-described embodiment, the 220kV-class cable connection has been described, but the voltage is not limited.

1: Stress Cone Compression Device
2: Press fitting
3: Press fitting metal flange
31:
4: Washer
43:
5: shaft (first shaft)
6: shaft (second shaft)
61: Marking offline
7: Spring
8:
9: protrusion
11: Bushing
12:
13: Cable terminal section
13a: Cable insulation
14: Stress cone

Claims (13)

delete delete delete A cylindrical press-fitting portion having a trumpet-shaped tapered portion which is diametrically opposed to the distal end portion in the inner periphery of the distal end portion,
A press-fitting metal flange spaced apart from a rear end surface of the pressing metal and having a distal end surface provided on a rear end surface of the bushing or the insulating barrel,
A ring washer provided on the rear end face side of the pressing metal flange at an interval,
A plurality of first shafts penetrating the washer and the pressing metal flange and fixed to the rear end of the pressing metal;
A coil spring fitted to the outer periphery of the first shaft, the coil spring having a front end surface abutting against a rear end surface of the pressing metal member and a rear end surface abutting against a front end surface of the washer,
A plurality of second sharps passing through the washer and fixed to the pressing metal flange,
And a gap adjusting member for adjusting a gap between the pressing metal flange and the washer,
The plurality of first shafts and the plurality of second shafts are arranged so as to be accommodated within a range of an inner diameter of a terminal insertion portion provided in the bushing or the insulating cylinder,
At least two of the plurality of first shafts each having a head portion at a rear end thereof,
Wherein a protruding portion is provided on an outer periphery of the second shaft near the front end thereof, and a distal end surface of the protruding portion abuts against a rear end surface of the pressing metal flange. A cylindrical press-fitting portion having a trumpet-shaped tapered portion which is diametrically opposed to the distal end portion in the inner periphery of the distal end portion,
A press-fitting metal flange spaced apart from a rear end surface of the pressing metal and having a distal end surface provided on a rear end surface of the bushing or the insulating barrel,
A ring washer provided on the rear end face side of the pressing metal flange at an interval,
A plurality of first shafts penetrating the washer and the pressing metal flange and fixed to the rear end of the pressing metal;
A coil spring fitted to the outer periphery of the first shaft, the coil spring having a front end surface abutting against a rear end surface of the pressing metal member and a rear end surface abutting against a front end surface of the washer,
A plurality of second sharps passing through the washer and fixed to the pressing metal flange,
And a gap adjusting member for adjusting a gap between the pressing metal flange and the washer,
The plurality of first shafts and the plurality of second shafts are arranged so as to be accommodated within a range of an inner diameter of a terminal insertion portion provided in the bushing or the insulating cylinder,
At least two of the plurality of first shafts each having a head portion at a rear end thereof,
Wherein a protruding portion is provided on an outer periphery of a distal end of the second shaft, the distal end surface of the protruding portion abuts a rear end surface of the pressing metal flange,
And a smooth portion is provided on the outer periphery of the protruding portion. A cylindrical press-fitting portion having a trumpet-shaped tapered portion which is diametrically opposed to the distal end portion in the inner periphery of the distal end portion,
A press-fitting metal flange spaced apart from a rear end surface of the pressing metal and having a distal end surface provided on a rear end surface of the bushing or the insulating barrel,
A ring washer provided on the rear end face side of the pressing metal flange at an interval,
A plurality of first shafts penetrating the washer and the pressing metal flange and fixed to the rear end of the pressing metal;
A coil spring fitted to the outer periphery of the first shaft, the coil spring having a front end surface abutting against a rear end surface of the pressing metal member and a rear end surface abutting against a front end surface of the washer,
A plurality of second sharps passing through the washer and fixed to the pressing metal flange,
And a gap adjusting member for adjusting a gap between the pressing metal flange and the washer,
The plurality of first shafts and the plurality of second shafts are arranged so as to be accommodated within a range of an inner diameter of a terminal insertion portion provided in the bushing or the insulating cylinder,
At least two of the plurality of first shafts each having a head portion at a rear end thereof,
Wherein a protruding portion is provided on an outer periphery of a distal end of the second shaft, the distal end surface of the protruding portion abuts a rear end surface of the pressing metal flange,
A smooth portion is provided on the outer periphery of the protruding portion,
And a depressed portion capable of receiving the head portion of the first shaft is provided at a rear end side of the washer. A cylindrical press-fitting portion having a trumpet-shaped tapered portion which is diametrically opposed to the distal end portion in the inner periphery of the distal end portion,
A press-fitting metal flange spaced apart from a rear end surface of the pressing metal and having a distal end surface provided on a rear end surface of the bushing or the insulating barrel,
A ring washer provided on the rear end face side of the pressing metal flange at an interval,
A plurality of first shafts penetrating the washer and the pressing metal flange and fixed to the rear end of the pressing metal;
A coil spring fitted to the outer periphery of the first shaft, the coil spring having a front end surface abutting against a rear end surface of the pressing metal member and a rear end surface abutting against a front end surface of the washer,
A plurality of second sharps passing through the washer and fixed to the pressing metal flange,
And a gap adjusting member for adjusting a gap between the pressing metal flange and the washer,
The plurality of first shafts and the plurality of second shafts are arranged so as to be accommodated within a range of an inner diameter of a terminal insertion portion provided in the bushing or the insulating cylinder,
At least two of the plurality of first shafts each having a head portion at a rear end thereof,
Wherein a protruding portion is provided on an outer periphery of a distal end of the second shaft, the distal end surface of the protruding portion abuts a rear end surface of the pressing metal flange,
A smooth portion is provided on the outer periphery of the protruding portion,
A recessed portion capable of receiving the head portion of the first shaft is provided at the rear end side of the washer,
And a marking offline line is displayed on the outer periphery of the second shaft at the rear end side than the projecting portion. A cylindrical press-fitting portion having a trumpet-shaped tapered portion which is diametrically opposed to the distal end portion in the inner periphery of the distal end portion,
A press-fitting metal flange spaced apart from a rear end surface of the pressing metal and having a distal end surface provided on a rear end surface of the bushing or the insulating barrel,
A ring washer provided on the rear end face side of the pressing metal flange at an interval,
A plurality of first shafts penetrating the washer and the pressing metal flange and fixed to the rear end of the pressing metal;
A coil spring fitted to the outer periphery of the first shaft, the coil spring having a front end surface abutting against a rear end surface of the pressing metal member and a rear end surface abutting against a front end surface of the washer,
A plurality of second sharps passing through the washer and fixed to the pressing metal flange,
And a gap adjusting member for adjusting a gap between the pressing metal flange and the washer,
The plurality of first shafts and the plurality of second shafts are arranged so as to be accommodated within a range of an inner diameter of a terminal insertion portion provided in the bushing or the insulating cylinder,
At least two of the plurality of first shafts each having a head portion at a rear end thereof,
Wherein a protruding portion is provided on an outer periphery of a distal end of the second shaft, the distal end surface of the protruding portion abuts a rear end surface of the pressing metal flange,
A smooth portion is provided on the outer periphery of the protruding portion,
A recessed portion capable of receiving the head portion of the first shaft is provided at the rear end side of the washer,
A marking offline line is displayed on the outer periphery of the rear end side of the projection of the second shaft,
A through hole for passing through the first shaft is provided at a predetermined interval on the inner circumferential side of the washer and a through hole for passing the second shaft is provided at a predetermined interval on the outer circumferential side of the washer Stress cone compression device. A cylindrical pressing tool having a trumpet-shaped tapered portion which is diametrically opposed to the distal end portion in the inner periphery of the distal end portion,
A press-fitting metal flange spaced apart from a rear end surface of the pressing metal and having a distal end surface provided on a rear end surface of the bushing or the insulating barrel,
A ring washer provided on the rear end face side of the pressing metal flange at an interval,
A plurality of first shafts penetrating the washer and the pressing metal flange and fixed to the rear end of the pressing metal;
A coil spring fitted to the outer periphery of the first shaft and having a distal end surface abutting against a rear end surface of the pressing metal member and a rear end surface abutting against a distal end surface of the washer,
A plurality of second sharps passing through the washer and fixed to the pressing metal flange,
And a gap adjusting member for adjusting a gap between the pressing metal flange and the washer,
Wherein a protruding portion is provided on an outer periphery of a distal end portion of the second shaft, the distal end surface of the protruding portion abuts against a rear end surface of the pressing metal flange,
A smooth portion is provided on the outer periphery of the protruding portion,
And a marking offline line is displayed on the outer periphery of the second shaft on the rear end side of the protruding portion. A cable end portion having a stress cone mounted on a cable insulator, and a stress cone compressing device according to any one of claims 4 to 9,
Wherein the tapered portion of the press fitting constituting the stress cone compression device abuts the tapered portion of the semiconductive portion constituting the stress cone. A cable end portion having a stress cone mounted on a cable insulator, and a stress cone compressing device according to any one of claims 4 to 9,
Wherein the tapered portion of the compression fitting constituting the stress cone compression device abuts against the tapered portion of the semiconductive portion constituting the stress cone,
Wherein a cable protecting bracket constituting said cable end portion is mounted on a rear end surface of a press-fitting bracket constituting said stress cone compressing device. delete 10. The method according to claim 4 or 9,
Wherein the plurality of first shafts insert a semicircular notch portion provided on an inner peripheral side of the pressing metal flange,
Wherein the spring inserts the notch portion of the pressing metal flange,
Wherein the plurality of second shafts are screwed into a screw hole provided at a tip end portion adjacent to the notch portion of the pressing metal flange,
The protruding portion of the second shaft is fixed integrally with the press fitting flange,
And a depressed portion capable of receiving the head portion of the first shaft is provided at a rear end side of the washer.

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