CN114498532A - Power cable connecting device - Google Patents

Abstract

The invention provides a power cable connecting device which can be miniaturized. A power cable connection device (1) is provided with: an insulating tube (21) into which the power cable (10) is inserted; an annular flange (3) that is fixed to the insulating tube (21) and is attached to the member (100) to be attached; and a cover (4) that is fixed to the flange (3) so as to cover the opening (30) from the base end side (X2) in the axial direction (X). A first recessed section (311) for accommodating a fastening member (61) for attaching the flange (3) to an attached member (100) is formed on a first surface (31) which is a surface on a tip side X1 in the axial direction X of the flange (3). A second recess (322) is formed in a second surface (32) that is a surface on the base end side (X2) of the flange (3) in the axial direction (X) on the inner peripheral side of the first recess (311), and a cover (4) is disposed in the second recess (32 b).

Description

Power cable connecting device

Technical Field

The present invention relates to a power cable connection device.

Background

Patent document 1 discloses a power cable connection device for connecting a power cable to another electric wire or the like. The power cable connection device described in patent document 1 includes: an insulating tube into which one end of the power cable is inserted; and an annular flange disposed on one side of the insulating tube in the axial direction and attached to the member to be attached. The flange is fastened to the mounted member using bolts.

In the power cable connection device described in patent document 1, a recess for receiving the bolt is formed in a surface of the flange on the insulating tube side, and the bolt is received in the recess so as not to protrude from the recess. When the bolt protrudes from the recess, the electric field intensity around the bolt increases, and discharge from the bolt is likely to occur, but the power cable connection device described in patent document 1 is intended to suppress the occurrence of discharge as described above by preventing the bolt from protruding from the recess.

Further, as described in patent document 2, the power cable connection device is provided with a cover that covers the opening of the annular flange from the side opposite to the insulating tube of the flange.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2012-23842

Patent document 2: japanese patent laid-open No. 2007-151310

Disclosure of Invention

Problems to be solved by the invention

However, in the case where the flange is formed with a recess for receiving the bolt as in the power cable connection device described in patent document 1, the thickness of the flange in the axial direction needs to be increased. When a cover as described in patent document 2 is attached to the flange, the size of the power cable connection device including the cover in the axial direction is increased unless otherwise noted.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a power cable connection device that can be miniaturized.

Means for solving the problems

In order to achieve the above object, the present invention provides a power cable connection device including: an insulating tube into which the power cable is inserted; an annular flange fixed to the insulating tube and attached to an attached member; and a cover fixed to the flange so as to cover the opening of the flange from one axial side, wherein a first recess is formed in a first surface that is a surface of the flange in the axial direction opposite to the cover side, the first recess accommodating a fastening member for attaching the flange to the member to be attached, a second recess is formed in a second surface that is the surface of the flange in the axial direction on the cover side and on an inner circumferential side of the first recess, and the cover is disposed in the second recess.

Effects of the invention

According to the present invention, a power cable connection device that can be miniaturized can be provided.

Drawings

Fig. 1 is a sectional view of a power cable connection device of a first embodiment.

Fig. 2 is an enlarged cross-sectional view of the flange periphery of fig. 1.

Fig. 3 is a rear view of the power cable connection device of the first embodiment.

Fig. 4 is a rear view of the flange unit of the first embodiment.

Fig. 5 is a rear view of the power cable connection device according to the first embodiment in a state where a ground wire is connected to a ground terminal.

Fig. 6 is a schematic explanatory view for explaining an installation structure of the power cable connection device of the first embodiment.

Fig. 7 is a sectional view of the power cable connection device of the second embodiment.

Fig. 8 is an enlarged cross-sectional view of fig. 7, with the vicinity of the flange enlarged.

Fig. 9 is a schematic explanatory view for explaining an installation structure of the power cable connection device of the third embodiment.

Description of the symbols

1-power cable connection device, 10-power cable, 100-mounted member, 11-ground terminal, 12-ground line, 121-end portion on ground terminal side, 21-insulating tube 26-embedded fixing member, 3-flange, 30-opening portion, 31-first face, 311-first recess, 32-second face, 322-second recess, 322 a-outer peripheral recess, 322 b-inner peripheral recess, 322 d-bottom face of outer peripheral recess, 4-cover, 61- (for mounting flange to mounted member) fastening member, 63- (for fastening flange and embedding fixing member) fastening member, X-axial direction.

Detailed Description

[ first embodiment ]

A first embodiment of the present invention will be described with reference to fig. 1 to 6. The embodiments described below are described as preferred specific examples for carrying out the present invention, and some of the various technical matters which are technically preferred are also specifically exemplified, but the technical scope of the present invention is not limited to the specific examples.

(Power cable connecting device 1)

Fig. 1 is a sectional view of a power cable connection device 1 of the present embodiment. Fig. 2 is an enlarged cross-sectional view of the flange 3 of fig. 1. Fig. 3 is a rear view of the power cable connection device 1 of the present embodiment.

As shown in fig. 1, the power cable connection device 1 includes a main body 2, a flange 3, a cover 4, and a connection portion 5. The body 2 ensures electrical insulation between the power cable 10 after being stripped and the members disposed around the power cable 10. The flange 3 is fixed to the mounted member 100. The member to be mounted 100 is formed with a mounting hole 100 a. The power cable connection device 1 is bolted to the mounted member 100 on the flange 3 in a state where the cover 4 is inserted into the mounting hole 100 a. The cover 4 covers the opening 30 formed in the center of the flange 3 from the side opposite to the main body 2 in the axial direction X. The connection unit 5 is a member for connecting the power cable 10 to the outside of the power cable connection device 1. Hereinafter, the direction in which the center axis C of the power cable 10 extends is referred to as an axial direction X. The body 2 side of the flange 3 in the axial direction X is referred to as a distal side X1, and the cover 4 side of the flange 3 is referred to as a proximal side X2.

(Main body 2)

The body 2 includes an insulating tube 21, an embedded conductor 22, a stopper 23, a stress cone 24, a pressing portion 25, and an embedded fixing member 26. The insulating tube 21 is formed by, for example, forming epoxy resin into a tubular shape. In particular, when the power cable connection device 1 is installed outdoors such as on a roof (see reference numeral 71 in fig. 6) of a railway vehicle (see reference numeral 7 in fig. 6 described later), an epoxy resin having excellent weather resistance is preferably used as the resin constituting the insulating tube 21. In this embodiment, the insulating tube 21 is not located closer to the base end side X2 than the flange 3 in the region where the flange 3 is formed on the tip end side X1, which will be described later. Annular umbrella portions 211 protruding to the outer peripheral side are provided at a plurality of positions in the axial direction X on the outer peripheral portion of the insulating tube 21 at predetermined intervals. By forming the plurality of umbrella portions 211 in the insulating tube 21, a creepage distance of the outer peripheral surface of the insulating tube 21 can be ensured, and generation of creeping discharge along the surface of the insulating tube 21 can be suppressed. The insulating tube 21 is molded by insert molding in which a molten resin is injected into a mold and solidified in a state where the embedded conductor 22, the embedded fixing member 26, and the like are arranged in the mold.

The embedded conductor 22 is made of a high-rigidity conductor such as brass or aluminum alloy. The embedded conductor 22 is disposed on the inner peripheral portion of the insulating tube 21. The embedded conductor 22 has a function of reinforcing the insulating tube 21 and a function of being electrically connected to the power cable 10 and having the same potential as the power cable 10, and alleviating electric field concentration around the power cable 10. The end of the embedded conductor 22 on the tip side X1 protrudes from the insulating tube 21 and is electrically connected to a connection unit 5 described later. The inner diameter of embedded conductor 22 is formed larger than the outer diameter of the portion of power cable 10 disposed inside embedded conductor 22. This makes it possible to easily insert the power cable 10 into the buried conductor 22. Further, a semiconductive layer for preventing formation of voids, alleviating electric field concentration, or the like may be provided between the outer peripheral portion of the embedded conductor 22 and the insulating tube 21.

The stopper 23 is formed of an annular conductor, and the power cable 10 is inserted inside. The stopper 23 has an inner diameter larger than an outer diameter of a portion of the power cable 10 disposed inside the stopper 23. The stopper 23 abuts on the end of the buried conductor 22 on the base end side X2. The stopper 23 functions as a stopper for restricting the movement of the stress cone 24 receiving the pressing force from the pressing portion 25 toward the tip side X1.

The stress cone 24 is disposed inside the end of the base end side X2 of the insulating tube 21 and has an annular shape. The stress cone 24 is inserted into the power cable 10 inside thereof, and contacts the outer peripheral surface of the inserted power cable 10. The stress cone 24 is made of a semiconductive material having conductivity and elasticity, for example, by dispersing conductive powder such as carbon in silicone rubber, EPM, EPDM, or the like. The stress cone 24 prevents a gap from being formed between the power cable 10 and the insulating tube 21, thereby preventing sparks from being generated between the power cable 10 and the insulating tube 21. The stress cone 24 also has a function of suppressing deterioration of the insulating tube 21 due to concentration of an electric field in the vicinity of the inner peripheral surface of the insulating tube 21. The inner circumferential surface of the stress cone 24 is equal to or smaller than the outer diameter of the portion of the power cable 10 disposed inside the stress cone 24 in a state before the power cable 10 is inserted. The outer peripheral surface of the stress cone 24 is equal to or larger than the inner diameter of the inner peripheral surface of the body 2 at the location where the stress cone 24 is disposed, in a state before insertion into the body 2. The stress cone 24 is inserted into the insulating tube 21 from the base end side X2 in a state of being fitted to the power cable 10, and is brought into close contact with both the power cable 10 and the insulating tube 2A in a state of being assembled to a predetermined position in the insulating tube 21.

The pressurization portion 25 is disposed on the outer peripheral side of the portion on the base end side X2 of the stress cone 24. The pressurizing portion 25 includes, for example, a coil spring or the like that is elastically deformable in the axial direction X. The pressurizing portion 25 pressurizes the stress cone 24 toward the stopper 23 side to compress the stress cone 24. This ensures the adhesion between the stress cone 24 and the insulating tube 21. The pressurizing portion 25 is supported by a first cover 41 of the cover 4, which will be described later.

As shown in fig. 2, the embedding fixing member 26 is embedded in the insulating tube 21 with its end portion on the base end side X2 exposed from the insulating tube 21. The embedded fixing member 26 is a cap nut formed in the axial direction X with a female screw hole 261 whose base end side X2 is open. The power cable connection device 1 of the present embodiment includes the embedded fixing members 26 at a plurality of locations in the circumferential direction, specifically, at 6 locations. The 6 embedded fixing members 26 are arranged on the outer peripheral side of the stress cone 24 at predetermined intervals in the circumferential direction. Bolts 631 serving as the fastening members 63 for fastening the flanges 3 to the embedded fixing members 26 are screwed into the embedded fixing members 26.

(Flange 3)

Fig. 4 is a rear view of the flange 3 alone. As shown in fig. 2, the flange 3 is formed in a disc shape having a thickness in the axial direction X. As shown in fig. 2 and 4, an opening 30 penetrating the flange 3 in the axial direction X is formed in the center of the flange 3, and the entire flange 3 is annular. The inner peripheral portion of the flange 3 faces the 6 embedded fixing members 26 in the axial direction X, and the outer peripheral portion of the flange 3 protrudes outward beyond the insulating tube 21. Hereinafter, the surface of the flange 3 facing the distal end side X1 is referred to as a first surface 31, and the surface of the flange 3 facing the proximal end side X2 is referred to as a second surface 32.

The first surface 31 of the flange 3 is formed with a first recess 311 that receives the fastening member 61 for attaching the flange 3 to the member 100 to be attached. The first recess 311 is formed near the outer peripheral end of the first face 31. As shown in fig. 3 and 4, the first recess 311 is formed at a plurality of locations in the circumferential direction, specifically, at 6 locations, on the first surface 31. The 6 first recesses 311 are formed at predetermined intervals in the circumferential direction. As shown in fig. 2, the flange 3 is provided with a first flange through hole 33 that penetrates from the bottom surface of the first recess 311 to the second surface 32 in the axial direction X. Further, a member through-hole 100b communicating with the first flange through-hole 33 is formed in the attached member 100 in the axial direction X.

The flange 3 is attached to the attached member 100 as follows. First, the flange 3 is overlapped with the mounted member 100, and then, the bolt 611 as one of the fastening members 61 is inserted into the member through hole 100b and the first flange through hole 33 from the base end side X2 in the axial direction X. Then, the end of the bolt 611 on the tip side X1 is projected into the first recess 311, and the nut 612, which is one of the fastening members 6a, is screwed to the end of the bolt 611 on the tip side X1. Thereby, the flange 3 is fastened to the mounted member 100 by the bolt.

In a state where the flange 3 is fastened to the member 100 to be mounted by the bolt, the end of the tip side X1 of the bolt 611 and the nut 612 are flush with the first surface 31 or are accommodated on the base end side X2 with respect to the first surface 31. Thereby, the fastening member 61 including the bolt 611 and the nut 612 does not protrude from the first recess 311 toward the distal end side X1. When the fastening member 61 protrudes from the first recess 3A toward the distal end side X1, the electric field strength around the fastening member 61 becomes high in the space closer to the distal end side X1 than the flange 3, and there is a possibility that electric discharge may occur from the fastening member 61, but by preventing the fastening member 61 from protruding from the inside of the first recess 311 toward the distal end side X1, the generation of electric discharge as described above can be suppressed.

The second surface 32 of the flange 3 has an annular facing surface 321 facing the mounted member 100 on the outer periphery. The facing surface portion 321 constitutes a joint surface that overlaps the member 100 to be mounted in a state where the flange 3 is mounted to the member 100 to be mounted.

A second concave portion 322 is formed on the inner peripheral side of the facing surface portion 321 of the second surface 32. The second concave portion 322 is formed at a position apart from the first concave portion 311 toward the inner circumferential side. The second recess 322 includes: an outer peripheral recessed portion 322a formed so as to be recessed toward the front end side X1 from the facing surface portion 321; and an inner circumferential recessed portion 322b formed on an inner circumferential side of the outer circumferential recessed portion 322a and recessed toward the front end side X1 from the bottom surface 322d of the outer circumferential recessed portion 322 a. That is, in this embodiment, the second concave portion 322 is formed in a stepped shape.

As shown in fig. 2 and 4, the outer peripheral recess 322a is formed in an annular shape, and the inner peripheral side and the base end side X2 are open. A female screw hole 322c that opens at a bottom surface 322d of the outer circumferential recess 322a is formed in the flange 3 in the axial direction X. As shown in fig. 4, the female screw holes 322c are formed at 6 locations in the circumferential direction. In the circumferential direction, 6 female screw holes 322c are formed at the same positions as the 6 first recesses 311. Bolts 621 serving as fastening members 62 for fixing the cover 4 to the flange 3, which will be described later, are screwed into the internal screw holes 322 c.

As shown in fig. 2 and 4, the inner circumferential recessed portion 322b is formed in an annular shape, and the inner circumferential side and the base end side X2 are open. The inner peripheral end of the inner peripheral recess 322b is continuous with the opening 30. Further, second flange through holes 34 penetrating from the bottom surface of the inner peripheral recess 322b to the first surface 31 in the axial direction X are provided at 6 locations in the circumferential direction of the flange 3. In the circumferential direction, 6 second flange through holes 34 are formed at the same positions as the 6 first recesses 311 and the 6 female screw holes 322 c. The second flange through holes 34 are formed at positions facing the female screw holes 261 of the 6 embedded fixing members 26 of the flange 3 in the axial direction X.

The flange 3 is fastened by bolts to the embedded fixing member 26 by inserting the bolts 631 as the fastening members 63 into the second flange through holes 34 from the base end side X2 and screwing the bolts 631 into the female screw holes 261 of the embedded fixing member 26. Thereby, the flange 3 and the insulating tube 21 are fixed to each other via the embedded fixing member 26. The bolt 631 is flush with the position of the open end of the inner circumferential recess 322b in the axial direction X, that is, the position of the bottom surface 322d of the outer circumferential recess 322a, or is accommodated on the tip side X1 with respect to the bottom surface 322d of the outer circumferential recess 322 a. That is, the bolt 631 does not protrude from the inner peripheral concave portion 322b toward the base end side X2. This can avoid interference between the first cover 41 and the bolt 63 when the first cover 41 is attached to the flange 3.

(cover 4)

As shown in fig. 2 and 3, the cover 4 has a first cover 41 and a second cover 42 fixed to each other. The first cover 41 is formed in a bottomed cylindrical shape having a distal end side X1 opened and a base end side X2 having a first bottom wall 411. An annular first flange portion 412 protruding to the outer peripheral side is formed on the open end side of the first cover 41. As shown in fig. 2, the portion of the first cover 41 on the distal end side X1 is disposed in the outer peripheral recess 322a of the second recess 322.

The front end side X1 of the first cover 41 is disposed in the outer peripheral recess 322a so as to cover the 6 female screw holes 322c formed in the flange 3. A flange through hole 412a that penetrates the first flange portion 412 in the axial direction X is formed in a portion of the first flange portion 412 that faces the 6 female screw holes 322c in the axial direction X. The first cover 41 is fastened by a bolt to the flange 3 by inserting the bolt 621 into the flange through hole 412a from the base end side X2 in the axial direction X and screwing the bolt 621 into the female screw hole 322 c. The pressing portion 25 is abutted on an end face 41a of the first cover 41 on the distal end side X1. Then, the first cover 41 is bolted to the flange 3, whereby the pressing portion 25 is supported by the first cover 41.

An end surface 41a of the leading end side X1 of the first cover 41 faces the bottom surface of the inner circumferential recess 322b of the second recess 322 in the axial direction X. Further, a bolt 631 for fastening the flange 3 to the embedded fixing member 26 is accommodated in a space surrounded by the end surface of the distal end side X1 of the first cover 41 and the inner circumferential recessed portion 322 b.

As shown in fig. 3, the ground terminal 11 is attached to a surface of the first flange portion 412 on the base end side X2 in the axial direction X. Fig. 5 is a rear view of the power cable connection device 1 according to the present embodiment in a state where the ground wire 12 is connected to the ground terminal 11. As shown in fig. 5, the ground terminal 11 is fastened to the first flange portion 412 by a bolt 64. The ground terminal 11 is connected to a ground potential via a ground line 12. The ground terminal 11 is formed such that an end 121 of the ground line 12 on the ground terminal 11 side is along the circumferential direction. For example, in a case where the extending direction of the end 121 of the ground wire 12 on the ground terminal 11 side intersects the circumferential direction at 30 ° or less, it can be said that the end 121 of the ground wire 12 on the ground terminal 11 side is a direction along the circumferential direction. In fig. 5, a central axis L1 of the end 121 of the ground wire 12 on the ground terminal 11 side, a virtual circle L2 along the circumferential direction around the center of the power cable 10, and a tangent L3 of a virtual circle L2 at the intersection position of the central axis L1 and the virtual circle L2 (i.e., the position marked by the circle in fig. 3) are indicated by two-dot chain lines. At this time, an angle θ formed between the extending direction of the end portion 121 of the ground wire 12 on the ground terminal 11 side and the circumferential direction is an angle formed between the central axis L1 and the tangent line L3. That is, in this embodiment, the absolute value of the angle θ is 30 ° or less. In this embodiment, the ground terminal 11 is formed of a crimp terminal including a caulking portion 111 caulked to a conductor at an end portion of the ground wire 12. The caulking portion 111 of the ground terminal 11 is fixed to the first cover 41 in a posture in which the conductor of the ground wire 12 can be inserted in the circumferential direction. The ground wire 12 is wound around, for example, the outer periphery of the power cable 10, and is compactly collected.

As shown in fig. 2, a first insertion hole 411a for inserting the power cable 10 is formed in the first bottom wall 411 of the first cover 41. Further, a cylindrical portion 413 extends from the periphery of the first insertion hole 411a of the first bottom wall 411 to the base end side X2. The cylindrical portion 413 and the power cable 10 are sealed by a sealing portion 13. The sealing portion 13 is formed by winding a polyethylene tape, an epoxy tape, or the like provided with an adhesive material, and seals the space between the cylindrical portion 413 and the power cable 10 in a liquid-tight manner.

The second cover 42 is attached to the first cover 41 so as to cover the seal portion 13 from the base end side X2. The second cover 42 is formed in a bottomed cylindrical shape in which the distal end side X1 in the axial direction X is open and the base end side X2 has a second bottom wall 421. An annular second flange portion 422 protruding to the outer peripheral side is formed at the open end of the second cover 42. The second cover 42 is fixed to the first cover 41 by inserting the bolt 65 through a through hole, not shown, formed so as to penetrate the second flange portion 422 in the axial direction X, and screwing the bolt 65 into a female screw hole, not shown, provided in the first bottom wall 411 of the first cover 41. A second insertion hole 421a for inserting the power cable 10 is formed in the second bottom wall 421 of the second cover 42. An elastic sheet 14 for liquid-tightly sealing the inner wall of the second insertion hole 421a and the outer peripheral surface of the power cable 10 is interposed therebetween.

(connecting part 5)

As shown in fig. 1, the connection portion 5 includes a conductor connection rod 51, a high-voltage shield 52, a fixed terminal 53, and a common fastening nut 54. The conductor connecting rod 51 has a connecting hole 511 that opens toward the base end side X2 along the axial direction X. The conductor portion 101 exposed from the insulating coating of the power cable 10 is inserted into the connection hole 511, and the end of the conductor connection rod 51 on the base end side X2 is crimped to the conductor portion 101. Thereby, the conductor connecting rod 51 and the power cable 10 are connected. Further, the conductor connecting rod 51 is formed with a male screw portion 512 protruding toward the distal end side X1.

The high-voltage shield 52 is made of a conductor and has a bottomed cylindrical shape opened at a base end side X2. The side wall 521 of the high-voltage shield 52 is cylindrical and covers the tip end of the embedded conductor 22 protruding from the insulating tube 21 to the tip end side X1 from the outer peripheral side. The externally threaded portion 512 extends through the bottom wall 522 of the high voltage shield 52.

The fixed terminal 53 has a plate shape and faces the front end side X1 of the high voltage shield 52. The fixed terminal 53 is formed with a first hole 531 through which the male screw portion 512 is inserted and a second hole 532 for connecting an electric wire or the like connecting the fixed terminal 53 to the outside. The fixed terminal 53 and the high voltage shield 52 are fastened together between the conductor connecting rod 51 and the common fastening nut 54, and thereby the fixed terminal 53, the high voltage shield 52, and the conductor connecting rod 51 are electrically connected to each other.

(mounting structure of Power Cable connection device 1)

Next, an installation structure of the power cable connection device 1 of the present embodiment to the roof 71 of the railway vehicle 7 will be described with reference to fig. 6. Fig. 6 is a schematic explanatory view for explaining an installation structure of the power cable connection device 1 of the present embodiment.

An arrangement recess 710 for arranging the pantograph 73 and the power cable connection device 1 is formed in the roof 71 of the railway vehicle 7. The side wall of the arrangement recess 710 is an inclined wall 72 inclined with respect to the horizontal direction. A mounting hole 100a penetrating the inclined wall 72 is formed in the inclined wall 72, and the flange 3 of the power cable connection device 1 is fixed by a bolt 611 and a nut 612 around the mounting hole 100a of the inclined wall 72. That is, in the present embodiment, the inclined wall 72 of the roof 71 of the railway vehicle 7 is the mounted member 100.

The work of attaching the power cable connection device 1 to the inclined wall 72 is performed by an operator at a position (for example, on the roof 71) on the distal end side X1 of the attachment hole 100a, for example. A wall portion near the inclined wall 7b of the roof 71 is formed with a working opening, not shown, for performing a work for attaching the power cable connection device 1 to the inclined wall 72. When the power cable connection device 1 is mounted on the inclined wall 72, first, the flange 3 of the power cable connection device 1 is overlapped with the inclined wall 72. Then, the bolt 611 is inserted into the member through hole (see reference numeral 100b in fig. 2) and the first flange through hole (see reference numeral 33 in fig. 2) from the working opening. Next, the nut 612 is screwed to the bolt 611, whereby the power cable connection device 1 is mounted to the inclined wall 72. Here, when the positions of the bolt 611 and the nut 612 are reversed from those described in the present embodiment, it is necessary to perform the task of aligning the hole of the nut 612 with the tip of the bolt 611 inserted into the component through hole (see reference numeral 100b in fig. 2) and the first flange through hole (see reference numeral 33 in fig. 2) through the task opening and, if necessary, in a hand-groped state. On the other hand, by setting the positions of the bolt 611 and the nut 612 to the positions described in the present embodiment, it is not necessary to perform the work of aligning the hole of the nut 612 with the tip of the bolt 611 through the work opening, and the work can be facilitated.

The power cable connection device 1 is attached in a posture in which a portion on the side where the insulating tube 21 protrudes from the flange 3 in the horizontal direction (i.e., the left side of the paper surface in fig. 6) is inclined toward the upper side in the vertical direction (i.e., the upper side of the paper surface in fig. 6). Thus, the portion on the distal end side X1 of the power cable connection device 1 is disposed closer to the trolley wire 15. The angle between the axial direction X of the cable connection device 1 and the horizontal direction can be, for example, 45 °. The inclination angle of the axial direction X with respect to the horizontal direction is not limited to 45 °, and the axial direction X may be aligned with the horizontal direction.

The power cable connection device 1 is connected to the pantograph 73 via a flexible electric wire 16. Thereby, electric power is supplied from the trolley wire 15 to the power cable connection device 1 via the pantograph 73 and the electric wire 16. The power cable connection device 1 is provided with an insulating cover 17 that covers a connection portion between the electric wire 16 and a fixed terminal (reference numeral 53 in fig. 1).

(action and Effect of the first embodiment)

In the present embodiment, the first surface 31 of the flange 3 is formed with a first recess 311 that accommodates the fastening member 61 for attaching the flange 3 to the member 100 to be attached. Thus, the fastening member 61 can be disposed in the first concave portion 311 so as not to protrude from the first concave portion 311 toward the distal end side X1, and thus, it is possible to suppress generation of discharge starting from the fastening member 61 in the space closer to the distal end side X1 than the flange 3.

Here, when the first recess 311 is formed in the flange 3, the flange 3 needs to be formed thick to some extent so that the first recess 311 can be formed to a depth enough to accommodate the fastening member 61. Therefore, if not particularly studied, the size of the entire power cable connection device 1 in the axial direction X may be increased.

In the power cable connection device 1 of the present embodiment, the second recess 322 is formed on the second surface 32 of the flange 3 on the inner circumferential side of the first recess 311, and the cover 4 is disposed in the second recess 322. This prevents the cover 4 from protruding largely from the flange 3 toward the base end side X2, and allows the power cable connection device 1 to be downsized even when the first recess 311 is formed in the flange 3. Accordingly, for example, when the power cable connection device 1 is mounted on the roof 71 of the railway vehicle 7 as in the present embodiment, the wiring space in the railway vehicle 7 can be prevented from being narrowed.

The second recess 322 further includes: an outer peripheral recess 322 a; and an inner circumferential recessed portion 322b formed on an inner circumferential side of the outer circumferential recessed portion 322a and recessed from a bottom surface 322d of the outer circumferential recessed portion 322a toward the side opposite to the cover 4 in the axial direction X. Further, the cover 4 is disposed in the outer peripheral recess 322 a. Further, a fastening member 63 for fastening the flange 3 and the embedded fixing member 26 is disposed in the inner peripheral recess 322 b. Therefore, the fastening member 63 for fastening the flange 3 and the embedded fixing member 26 can be provided so as to be accommodated in the inner peripheral concave portion 322b, and the increase in size of the entire power cable connection device 1 due to the arrangement of the fastening member 63 can be prevented.

The ground terminal 11 attached to the surface of the base end side X2 of the cover 4 is configured such that the end 121 of the ground wire 12 attached to the ground terminal 11 on the ground terminal 11 side is oriented in the circumferential direction. Further, the ground wire 12 is wound around the outer periphery of the power cable 10. Therefore, as shown in fig. 5, the ground wire 12 extending from the ground terminal 11 is easily wound around the outer periphery of the power cable 10. That is, for example, in the case where the end 12a of the ground line 12 on the ground terminal 11 side is in the radial direction, when the ground line 12 is to be wound around the outer periphery of the power cable 10, if the ground line 12 is not bent sharply, it is difficult to wind the ground line 12 around the outer periphery of the power cable 10, but in this embodiment, the ground line 12 can be easily wound around the outer periphery of the power cable 10 without bending the ground line 12 sharply. Further, the ground wire 12 does not greatly bulge out to the outer peripheral side, and the ground wire 12 can be wound around the outer peripheral portion of the power cable 10, so that the power cable connection device 1 including the ground wire 12 can be downsized.

As described above, according to the present embodiment, a power cable connection device that can be downsized can be provided.

Further, the bolt 611 as the fastening member 61 for attaching the flange 3 to the member 100 to be attached and the nut 612 can be positioned in opposite directions, and the head of the bolt 611 can be accommodated in the first recess 311. In addition, when the head of the bolt 611 is disposed in the first recess 311, the member through-hole 100b of the mounted member 100 may be a female screw hole. In this case, the nut can be omitted.

[ second embodiment ]

Fig. 7 is a sectional view of the power cable connection device 1 of the present embodiment. In this embodiment, the insulating tube 21 is made of a material having lower rigidity than epoxy resin. In addition, of the reference numerals used in the second and subsequent embodiments, the same reference numerals as those used in the present embodiment denote the same components and the like as those of the present embodiment unless otherwise specified. In this embodiment, the description overlapping with the description of the first embodiment will be appropriately omitted, and the description will be mainly given of the structure different from the first embodiment.

The body 2 includes an insulating tube 21, an embedded conductor 22, a first semiconductive layer 27a, an embedded fixing member 26, a second semiconductive layer 27b, and a third semiconductive layer 27 c. In this embodiment, the insulating tube 21 is formed in a tubular shape from a material having lower rigidity than the epoxy resin, for example, a polymer material, and has flexibility. Examples of the polymer material constituting the insulating tube 21 include silicone rubber, ethylene-propylene rubber (EPM), and ethylene-propylene-diene rubber (EPDM). In this embodiment, the insulating tube 21 is inserted into the opening 30 of the flange 3, and projects from the flange 3 toward the distal end side X1 and also projects toward the proximal end side X2. The insulating tube 2 is molded by insert molding in which a molten resin constituting the insulating tube 21 is injected into a mold and solidified in a state where the embedded conductor 22, the first semiconductive layer 27a, the embedded fixing member 26, the second semiconductive layer 27b, the third semiconductive layer 27c, and the like are arranged in the mold.

The embedded conductor 22 is made of a material having higher rigidity than the insulating tube 21, for example, a metal such as brass or an aluminum alloy. The end of the embedded conductor 22 on the base end side X2 is radially opposed to the embedded fixing member 26 via the insulating tube 21 and the like.

The first semiconductor layer 27a is provided so as to be interposed between the buried conductor 22 and the insulating tube 21. The first semiconductor layer 27a is formed in a cylindrical shape so as to surround the portion of the embedded conductor 22 other than the distal end portion from the outer peripheral side. Further, the first semiconductive layer 27a is also interposed between the power cable 10 and the insulating tube 21 on the base end side X2 of the embedded conductor 22. The first semiconductive layer 27a is made of a semiconductive material having conductivity and elasticity, for example, by dispersing conductive powder such as carbon in silicone rubber, EPM, EPDM, or the like. The first semiconductive layer 27a has a function of preventing formation of a gap between the embedded conductor 22 and the insulating tube 21 and a function of suppressing deterioration of the insulating tube 21 due to concentration of an electric field in the vicinity of the inner peripheral surface of the insulating tube 21.

The embedded fixing member 26 includes a member cylinder portion 262 and a member flange portion 263. The member tube portion 262 is formed in a cylindrical shape, and the member flange portion 263 is formed in an annular shape so as to protrude from the member tube portion 262 toward the outer circumferential side. The embedded fixing member 26 is disposed on the outer peripheral side of the embedded conductor 22, and is disposed so as to face the end of the base end side X2 of the embedded conductor 22 through the insulating tube 21. The embedded fixing member 26 is embedded in the insulating tube 21 so that a joint surface portion 263a provided on the surface of the base end side X2 of the member flange portion 263 and the flange 3 is exposed. Further, the embedded fixing member 26 is provided with a female screw hole 261 opened in the engagement surface portion 263 a. Bolts 631 for fixing the flange 3 to the embedded fixing member 26 are screwed into the internal screw holes 261.

The second semiconductive layer 27b is provided so as to be interposed between the embedded and fixed member 26 and the insulating tube 21. The second semiconductive layer 27b is provided over the entire region where the embedded fixing member 26 and the insulating tube 21 face each other. The second semiconductive layer 27b is made of a semiconductive material having conductivity and elasticity, for example, by dispersing conductive powder such as carbon in silicone rubber, EPM, EPDM, or the like, similarly to the first semiconductive layer 27 a. The second semiconductive layer 27b has an effect of preventing a gap from being formed between the embedded fixing member 26 and the insulating tube 21 and an effect of preventing an electric field from concentrating near an opposite surface of the insulating tube 21 opposite to the embedded fixing member 26 and degrading the insulating tube 21.

The third semiconductive layer 27c is formed annularly inside the end portion of the base end side X2 of the insulating tube 21. The third semiconductive layer 27c is inserted into the power cable 10 on the inside thereof, and is in contact with the outer peripheral surface of the inserted power cable 10. The third semiconductive layer 27c is composed of a semiconductive material having conductivity and elasticity, in which conductive powder such as carbon is dispersed in silicone rubber, EPM, EPDM, or the like, similarly to the first semiconductive layer 27a and the second semiconductive layer 27 b. The surface 27d on the tip side X1 of the third semiconductive layer 27c is formed so as to extend to the outer peripheral side from the position corresponding to the tip side X1, whereby the distance between each part of the surface 27d on the tip side X1 of the third semiconductive layer 27c and the end of the base end side X2 of the embedded conductor 2 is made uniform. The third semiconductive layer 27c has an effect of reducing the electric field intensity at the base end side X2 of the embedded conductor 2.

The surface portion of the body 2 that contacts the outer peripheral surface of the power cable 10 (i.e., the inner peripheral surface of the insulating tube 21, the inner peripheral surface of the first semiconductive layer 27a at the portion located on the base end side X2 of the embedded conductor 22, and the inner peripheral surface of the third semiconductive layer 27 c) has a smaller outer diameter than the portion of the power cable 10 that is disposed inside the surface portion in the state before the power cable 10 is inserted into the body 2. The power cable 10 is inserted into the body 2 while being spread out from the face, and is in close contact with the face while being inserted into the body 2.

(Flange 3)

Fig. 8 is an enlarged cross-sectional view of the vicinity of the flange 3 in fig. 7. The structure of the flange 3 is the same as that of the first embodiment. That is, the first surface 31 of the flange 3 is formed with a first recess 311 that accommodates the fastening member 61 for attaching the flange 3 to the member 100, and the second surface 32 of the flange 3 is formed with a second recess 322 that is composed of an outer circumferential recess 322a and an inner circumferential recess 322 b. The flange 3 overlaps the engagement surface 263a of the embedded fixing member 26 so that the second flange through hole 34 formed in the flange 3 so as to open in the inner peripheral recessed portion 322b communicates with the female screw hole 261 of the embedded fixing member 26. The flange 3 is fastened by a bolt 631 as the fastening member 63 to the embedded fixing member 26 by inserting the bolt 631 from the base end side X2 into the second flange through hole 34 and screwing the bolt 631 into the female screw hole 261 of the embedded fixing member 26. Thereby, the flange 3 and the insulating tube 21 are fixed to each other via the embedded fixing member 26. The bolt 631 does not protrude from the inner peripheral recess 322b toward the base end side X2.

(cover 4)

The cover 4 is formed of brass, aluminum alloy, or the like in a cylindrical shape, and covers the body 2 protruding from the embedded fixing member 26 toward the base end side X2 from the outer peripheral side. A cover flange portion 43 protruding outward is formed at the end of the front end side X1 of the cover 4. The portion on the front end side X1 of the cover is disposed in the outer peripheral recess 322a of the second recess 322.

The front end side X1 of the cover 4 is disposed in the outer peripheral recess 322a so as to cover the 6 female screw holes 322c formed in the flange. A cover through hole 430 that penetrates the cover flange portion 43 in the axial direction X is formed in a portion of the cover flange portion 43 that faces the 6 female screw holes 322c in the axial direction X. The cover 4 is bolted to the flange 3 by inserting the bolt 621 into the cover through hole 430 from the base end side X2 in the axial direction X and screwing the bolt 621 into the female screw hole 322 c. As shown in fig. 7, the end of the proximal side X2 of the cover 4 and the power cable 10 are sealed by the sealing portion 13.

The other structure is the same as that of the first embodiment.

(action and Effect of the second embodiment)

This embodiment also has the same operation and effects as the first embodiment.

[ third embodiment ]

Fig. 9 is a schematic explanatory view for explaining the mounting structure of the power cable connection device 1 of the present embodiment. This embodiment is a method in which the power cable connection device 1 is applied to an inter-vehicle connection structure of a railway vehicle.

In this embodiment, the power cable connection device 1 is provided in pairs in each of the adjacent railway vehicles 7 so that the tip sides X1 face each other. Each power cable connection device 1 is attached around the attachment hole 100a of the inclined wall 72 inclined at 45 ° or less with respect to the horizontal direction. The fixed terminals (see reference numeral 53 in fig. 1) in the insulating covers 17 of the paired power cable connection devices 1 are electrically connected to each other by flexible wires 16. The other structure of this embodiment is the same as that of the first embodiment.

(action and Effect of the third embodiment)

This embodiment also has the same operation and effects as the first embodiment.

(summary of the embodiment)

Next, the technical ideas grasped from the above-described embodiments are described with reference to reference numerals and the like in the embodiments. However, the reference numerals and the like in the following description are not limited to those for specifically indicating the constituent elements in the claims as the components of the embodiments.

[1] A power cable connection device 1 is characterized by comprising: an insulating tube 21 into which the power cable 10 is inserted; the present invention provides a flange mounting structure including an annular flange 3 fixed to the insulating tube 21 and mounted to a mounted member 100, and a cover 4 fixed to the flange 3 so as to cover an opening 30 of the flange 3 from one side in an axial direction X, wherein a first recess 311 for accommodating a fastening member 61 for mounting the flange 3 to the mounted member 100 is formed in a first surface 31 which is a surface of the flange 3 on the opposite side to the cover 4 side in the axial direction X, a second recess 322 is formed in a second surface 32 which is a surface of the flange 3 on the cover 4 side in the axial direction X and is located on an inner peripheral side of the first recess 311, and the cover 4 is disposed in the second recess 322.

[2] The power cable connection device 1 according to claim 1, wherein the flange 3 is fixed to the insulating tube 21 via an embedding and fixing member 26 embedded in the insulating tube 21, and the second recess 322 includes: an outer peripheral recess 322 a; and an inner circumferential recessed portion 322b formed on an inner circumferential side of the outer circumferential recessed portion 322a and recessed toward an opposite side of the cover (4) in the axial direction X from a bottom surface 322d of the outer circumferential recessed portion 322a, wherein the cover 4 is disposed in the outer circumferential recessed portion 322a, and a fastening member 63 for fastening the flange 3 and the embedded fixing member 26 is disposed in the inner circumferential recessed portion 322 b.

[3] The power cable connection device 1 according to [1] or [2], wherein a ground terminal 11 connected to a ground potential is attached to a surface of the cover 4 opposite to the flange 3, and the ground terminal 11 is configured such that an end 131 of a ground wire 12 attached to the ground terminal 11 on the ground terminal 11 side is in a direction along a circumferential direction, and the ground wire 12 is wound around an outer peripheral portion of the power cable 10.

While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. Note that all combinations of the features described in the embodiments are not necessarily essential to means for solving the problems of the present invention. The present invention can be implemented with appropriate modifications without departing from the spirit and scope thereof.

Claims (3)

1. A power cable connecting device is characterized by comprising:

an insulating tube into which the power cable is inserted;

an annular flange fixed to the insulating tube and attached to an attached member; and

a cover fixed to the flange so as to cover an opening of the flange from one axial side,

a first recess portion that receives a fastening member for attaching the flange to the member to be attached is formed on a first surface that is a surface of the flange on a side opposite to the cover side in the axial direction,

a second recess is formed on a second surface of the flange on the cover side in the axial direction and on an inner circumferential side of the first recess,

the cover is disposed in the second recess.

2. Power cable connection device according to claim 1,

the flange is fixed to the insulating tube via an embedded fixing member embedded in the insulating tube,

the second recess includes: an outer peripheral recess; and an inner circumferential recessed portion formed on an inner circumferential side of the outer circumferential recessed portion and formed so as to be recessed from a bottom surface of the outer circumferential recessed portion toward an opposite side to the cover in an axial direction,

the cover is disposed in the outer peripheral recess,

a fastening member for fastening the flange and the embedded fixing member is disposed in the inner circumferential recessed portion.

3. A power cable connection device according to claim 1 or 2,

a ground terminal connected to a ground potential is attached to a surface of the cover opposite to the flange,

the ground terminal is configured such that an end portion of a ground wire attached to the ground terminal on the ground terminal side is oriented in a circumferential direction,

the ground wire is wound around an outer peripheral portion of the power cable.

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