JP2022077590A - Power cable connection device - Google Patents

Abstract

To provide a power cable connection device which can be downsized.SOLUTION: A power cable connection device 1 has a bushing 21 into which a power cable 10 is inserted, an annular flange 3 fixed to the bushing 21 and attached to an attached member 100, and a cover 4 fixed to the flange 3 so as to cover an opening 30 from a base end side X2 in an axial direction X. A first recess part 311 housing a fastening member 61 for attaching the flange 3 to the attached member 100 is formed in a first surface 31 that is a surface of a tip side X1 in the axial direction X in the flange 3. A second recess part 322 is formed at a position in an inner peripheral side than the first recess part 311 in a second surface 32 that is a surface of the base end side X2 in the axial direction X in the flange 3, and the cover 4 is disposed within the second recess part 322.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power cable connecting device.

Patent Document 1 discloses a power cable connecting device for connecting a power cable to another electric wire or the like. The power cable connecting device described in Patent Document 1 includes a power cable having one end of the power cable inserted therein, and an annular flange arranged on one side of the power cable in the axial direction and attached to a member to be attached. The flange is fastened to the attached member using bolts.

Here, in the power cable connecting device described in Patent Document 1, a recess for accommodating the bolt is formed on the surface of the flange on the porcelain tube side, and the bolt is accommodated in the recess so as not to protrude from the recess. There is. When the bolt protrudes from the recess, the electric field strength around the bolt becomes high and discharge is likely to occur from the bolt. Therefore, the power cable connecting device described in Patent Document 1 prevents the bolt from protruding from the recess. We are trying to suppress the occurrence of the above-mentioned discharge.

Further, in the power cable connecting device, as described in Patent Document 2, a cover is attached to cover the opening in the annular flange from the side opposite to the flange tube.

Japanese Unexamined Patent Publication No. 2012-23842 Japanese Unexamined Patent Publication No. 2007-151310

However, when a recess for accommodating a bolt is formed in the flange as in the power cable connecting device described in Patent Document 1, it is necessary to increase the thickness of the flange in the axial direction. When a cover as described in Patent Document 2 is attached to such a flange, the axial dimension of the power cable connecting device including the cover becomes large unless special measures are taken.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power cable connection device capable of miniaturization.

In the present invention, in order to achieve the above object, a flange tube into which a power cable is inserted, an annular flange fixed to the flange tube and attached to a member to be attached, and an opening of the flange from one side in the axial direction. A cover fixed to the flange so as to cover the portion is provided, and a first surface of the flange, which is a surface opposite to the cover side in the axial direction, is fastened to attach the flange to the attached member. A first recess for accommodating a member is formed, and a second recess is formed on the second surface of the flange, which is a surface on the cover side in the axial direction, at a position on the inner peripheral side of the first recess. Provided is a power cable connecting device in which a cover is arranged in the second recess.

According to the present invention, it is possible to provide a power cable connection device capable of miniaturization.

It is sectional drawing of the power cable connection apparatus in 1st Embodiment. It is an enlarged sectional view around the flange of FIG. It is a rear view of the power cable connection device in 1st Embodiment. It is a rear view of the flange alone in 1st Embodiment. It is a rear view of the power cable connection device in the state which the ground wire is connected to the ground terminal in 1st Embodiment. It is a schematic explanatory drawing for demonstrating the mounting structure of the power cable connection device in 1st Embodiment. It is sectional drawing of the power cable connection device in 2nd Embodiment. FIG. 7 is an enlarged cross-sectional view of the vicinity of the flange in FIG. 7. It is a schematic explanatory drawing for demonstrating the mounting structure of the power cable connection device in 3rd Embodiment.

[First Embodiment]
The first embodiment of the present invention will be described with reference to FIGS. 1 to 6. It should be noted that the embodiments described below are shown as suitable specific examples for carrying out the present invention, and there are some parts that specifically exemplify various technically preferable technical matters. , The technical scope of the present invention is not limited to this specific aspect.

(Power cable connection device 1)
FIG. 1 is a cross-sectional view of the power cable connecting device 1 in this embodiment. FIG. 2 is an enlarged cross-sectional view of the periphery of the flange 3 of FIG. FIG. 3 is a rear view of the power cable connecting device 1 in this embodiment.

As shown in FIG. 1, the power cable connecting device 1 includes a main body portion 2, a flange 3, a cover 4, and a connecting portion 5. The main body 2 secures electrical insulation between the stripped power cable 10 and the members arranged around the power cable 10. The flange 3 is fixed to the attached member 100. A mounting hole 100a is formed in the mounted member 100. The power cable connecting device 1 is bolted to the mounted member 100 at the flange 3 with the cover 4 inserted into the mounting hole 100a. 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 portion 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 central axis C of the power cable 10 extends is referred to as the axial direction X. Further, the main body 2 side of the flange 3 in the axial direction X is referred to as a tip end side X1, and the cover 4 side of the flange 3 is referred to as a proximal end side X2.

(Main body 2)
The main body 2 includes a porcelain tube 21, an embedded conductor 22, a stopper 23, a stress cone 24, a pressure portion 25, and an embedded fixing member 26. The 碍 tube 21 is made of, for example, an epoxy resin formed into a tubular shape. In particular, when the power cable connecting device 1 is installed outdoors such as on the roof of a railroad vehicle (see reference numeral 7 in FIG. 6 described later) (see reference numeral 71 in FIG. 6), it is weatherable as a resin constituting the epoxy tube 21. It is preferable to use an excellent epoxy resin. In the present embodiment, the porcelain tube 21 is formed in the region of the distal end side X1 with respect to the flange 3 described later, and does not exist in the proximal end side X2 with respect to the flange 3. An annular umbrella portion 211 projecting to the outer peripheral side is provided on the outer peripheral portion of the 碍 tube 21 at a plurality of positions in the axial direction X at predetermined intervals. By forming a plurality of umbrella portions 211 on the porcelain tube 21, the creepage distance of the outer peripheral surface of the basin tube 21 can be secured, and the occurrence of creeping discharge along the surface of the porcelain tube 21 can be suppressed. The porcelain tube 21 is formed by insert molding in which a molten resin is injected into the mold and cured in a state where the embedded conductor 22 and the embedded fixing member 26 are arranged in the mold.

The embedded conductor 22 is made of a highly rigid conductor such as brass or an aluminum alloy. The embedded conductor 22 is arranged on the inner peripheral portion of the porcelain tube 21. The embedded conductor 22 has a role of reinforcing the porcelain tube 21 and a role of being electrically connected to the power cable 10 to have the same potential as the power cable 10 and relaxing the electric field concentration around the power cable 10. The end portion of the tip end side X1 of the embedded conductor 22 protrudes from the porcelain tube 21 and is electrically connected to the connection portion 5 described later. The inner diameter of the embedded conductor 22 is formed to be larger than the outer diameter of the portion arranged inside the embedded conductor 22 in the power cable 10. This makes it easier to insert the power cable 10 inside the embedded conductor 22. A semi-conductive layer may be provided between the outer peripheral portion of the embedded conductor 22 and the porcelain tube 21 to prevent the formation of voids and alleviate the concentration of electric fields.

The stopper 23 is made of an annular conductor, and the power cable 10 is inserted inside. The inner diameter of the stopper 23 is larger than the outer diameter of the portion of the power cable 10 arranged inside the stopper 23. The stopper 23 is in contact with the end portion of the base end side X2 of the embedded conductor 22. The stopper 23 has a role as a stopper for restricting the movement of the stress cone 24, which receives the pressure from the pressurizing portion 25, to the tip end side X1.

The stress cone 24 is arranged inside the end portion of the base end side X2 of the porcelain tube 21 and exhibits an annular shape. The power cable 10 is inserted into the stress cone 24, and the stress cone 24 comes into contact with the outer peripheral surface of the inserted power cable 10. The stress cone 24 is made of, for example, an elastic semi-conductor in which a conductive powder such as carbon is dispersed in silicone rubber, EPM, EPDM or the like to give conductivity. The stress cone 24 prevents the formation of a gap between the power cable 10 and the porcelain tube 21 to prevent sparks from being generated between the power cable 10 and the porcelain tube 21. Further, the stress cone 24 also has a role of suppressing the deterioration of the porcelain tube 21 due to the concentration of the electric field near the inner peripheral surface of the porcelain tube 21. The inner peripheral surface of the stress cone 24 is equal to or smaller than the outer diameter of the portion of the power cable 10 arranged inside the stress cone 24 before being inserted into the power cable 10. Further, the outer peripheral surface of the stress cone 24 is equal to or larger than the inner diameter of the portion of the inner peripheral surface of the main body 2 where the stress cone 24 is arranged before being inserted into the main body 2. The stress cone 24 is inserted from the base end side X2 inside the porcelain tube 21 in a state of being externally fitted to the power cable 10, and is attached to both the power cable 10 and the porcelain tube 21 in a state of being assembled at a predetermined position in the porcelain tube 21. In close contact.

The pressurizing portion 25 is arranged on the outer peripheral side of the portion of the base end side X2 of the stress cone 24. The pressurizing unit 25 includes, for example, a coil spring that can be elastically deformed in the axial direction X. The pressurizing unit 25 pressurizes the stress cone 24 toward the stopper 23 side to compress the stress cone 24. As a result, the adhesion between the stress cone 24 and the porcelain tube 21 is ensured. The pressurizing unit 25 is supported by a first cover 41, which will be described later, of the cover 4.

As shown in FIG. 2, the embedded fixing member 26 is embedded in the porcelain tube 21 while exposing the end portion of the base end side X2 from the porcelain tube 21. The embedded fixing member 26 is a cap nut in which a female screw hole 261 having an open base end side X2 is formed along the axial direction X. The power cable connecting device 1 of the present embodiment includes embedded fixing members 26 at a plurality of locations in the circumferential direction, specifically, six locations. The six embedded fixing members 26 are arranged on the outer peripheral side of the stress cone 24, and are arranged at predetermined intervals in the circumferential direction. A bolt 631 as a fastening member 63 for fixing the flange 3 to the embedded fixing member 26 is screwed into the embedded fixing member 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 disk shape having a thickness in the axial direction X. As shown in FIGS. 2 and 4, an opening 30 is formed in the central portion of the flange 3 so as to penetrate the flange 3 in the axial direction X, and the flange 3 has an annular shape as a whole. The inner peripheral portion of the flange 3 faces the six embedded fixing members 26 in the axial direction X, and the outer peripheral portion of the flange 3 projects toward the outer peripheral side from the porcelain tube 21. Hereinafter, the surface of the flange 3 facing the tip end side X1 will be referred to as the first surface 31, and the surface of the flange 3 facing the proximal end side X2 will be referred to as the second surface 32.

The first surface 31 of the flange 3 is formed with a first recess 311 that accommodates a fastening member 61 for attaching the flange 3 to the attached member 100. The first recess 311 is formed near the outer peripheral end of the first surface 31. As shown in FIGS. 3 and 4, the first recesses 311 are formed at a plurality of locations in the circumferential direction, specifically at six locations, on the first surface 31. The six 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, in the attached member 100, a member through hole 100b communicating with the first flange through hole 33 is formed along the axial direction X.

The flange 3 is attached to the attached member 100 as follows. First, the flange 3 is superposed on the attached member 100, and then the bolt 611, which is 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. Will be done. Then, the end of the tip side X1 of the bolt 611 is projected into the first recess 311 and the nut 612, which is one of the fastening members 61, is screwed into the end of the tip side X1 of the bolt 611. As a result, the flange 3 is bolted to the attached member 100.

In a state where the flange 3 is bolted to the mounted member 100, the end portion of the tip end side X1 of the bolt 611 and the nut 612 are fitted flush with the first surface 31 or in the base end side X2 with respect to the first surface 31. ing. As a result, the fastening member 61 including the bolt 611 and the nut 612 does not protrude from the first recess 311 to the tip end side X1. When the fastening member 61 protrudes from the first recess 311 to the distal end side X1, the electric field strength increases around the fastening member 61 in the space of the distal end side X1 rather than the flange 3, and a discharge is generated starting from the fastening member 61. Although there is a risk, by preventing the fastening member 61 from protruding from the inside of the first recess 311 toward the tip end side X1, it is possible to suppress the generation of the above-mentioned discharge.

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

A second recess 322 is formed on the inner peripheral side of the facing surface portion 321 on the second surface 32. The second recess 322 is formed at a position away from the first recess 311 on the inner peripheral side. The second recess 322 is formed on the inner peripheral side of the outer peripheral recess 322a formed so as to be recessed on the tip side X1 from the facing surface portion 321 and is recessed on the tip side X1 from the bottom surface 322d of the outer peripheral recess 322a. It is provided with an inner peripheral recess 322b formed in such a manner. That is, in this embodiment, the second recess 322 is configured in a stepped shape.

As shown in FIGS. 2 and 4, the outer peripheral recess 322a is formed in an annular shape, and the inner peripheral side and the proximal end side X2 are open. The flange 3 is formed with a female screw hole 322c that opens in the bottom surface 322d of the outer peripheral recess 322a along the axial direction X. As shown in FIG. 4, female screw holes 322c are formed at six locations in the circumferential direction. In the circumferential direction, the six female screw holes 322c are formed at the same positions as the six first recesses 311. A bolt 621 as a fastening member 62 for fixing the cover 4 described later to the flange 3 is screwed into the female screw hole 322c.

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

The flange 3 is an embedded fixing member by inserting a bolt 631 as a fastening member 63 into the second flange through hole 34 from the base end side X2 and screwing the bolt 631 into the female screw hole 261 of the embedded fixing member 26. It is bolted to 26. As a result, the flange 3 and the porcelain tube 21 are fixed to each other via the embedded fixing member 26. The bolt 631 is housed in the position of the open end portion of the inner peripheral recess 322b in the axial direction X, that is, flush with the position of the bottom surface 322d of the outer peripheral recess 322a, or in the tip end side X1 of the bottom surface 322d of the outer peripheral recess 322a. That is, the bolt 631 does not protrude from the inner peripheral recess 322b to the proximal end side X2. As a result, when the first cover 41 is attached to the flange 3, interference between the first cover 41 and the bolt 631 can be avoided.

(Cover 4)
As shown in FIGS. 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 the shape of a bottomed cylinder having the first bottom wall 411 on the base end side X2 while the tip end side X1 is opened. On the open end side of the first cover 41, an annular first flange portion 412 protruding toward the outer peripheral side is formed. As shown in FIG. 2, the portion of the tip end side X1 of the first cover 41 is arranged in the outer peripheral recess 322a of the second recess 322.

The portion of the tip end side X1 of the first cover 41 is arranged in the outer peripheral recess 322a so as to cover the six female screw holes 322c formed in the flange 3. At the portion of the first flange portion 412 facing the six female screw holes 322c in the axial direction X, a flange through hole 412a that penetrates the first flange portion 412 in the axial direction X is formed. The first cover 41 is bolted to the flange 3 by inserting a 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 322c. The pressurizing portion 25 is in contact with the end surface 41a of the tip end side X1 of the first cover 41. Then, by bolting the first cover 41 to the flange 3, the pressurizing portion 25 is supported by the first cover 41.

The end surface 41a of the tip end side X1 of the first cover 41 faces the bottom surface of the inner peripheral recess 322b of the second recess 322 in the axial direction X. A bolt 621 for fastening the flange 3 to the embedded fixing member 26 is housed in a space surrounded by the end surface of the tip end side X1 of the first cover 41 and the inner peripheral recess 322b.

As shown in FIG. 3, a ground terminal 11 is attached to the surface of the base end side X2 in the axial direction X in the first flange portion 412. FIG. 5 is a rear view of the power cable connecting device 1 in the present embodiment in which the grounding wire 12 is connected to the grounding 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 the ground potential via the ground wire 12. The ground terminal 11 is formed so that the end portion 121 of the ground wire 12 on the ground terminal 11 side is oriented in the circumferential direction. For example, when the extending direction and the circumferential direction of the end 121 on the ground terminal 11 side of the ground wire 12 intersect at 30 ° or less, the end 121 on the ground terminal 11 side of the ground wire 12 is along the circumferential direction. It can be said that it is a direction. Here, in FIG. 5, the central axis L1 of the end portion 121 on the ground terminal 11 side of the ground wire 12, the virtual circle L2 along the circumferential direction centered on the center of the power cable 10, and the central axis L1 and the virtual circle. The tangent line L3 of the virtual circle L2 at the intersection position with L2 (that is, the position of the circle in FIG. 3) is represented by a two-point chain line. At this time, the angle θ formed by the extending direction and the circumferential direction of the end portion 121 on the grounding terminal 11 side of the grounding wire 12 is the angle formed by 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 composed of a crimp terminal provided with a crimped portion 111 crimped to a conductor at the end of the ground wire 12. The caulked 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 direction along the circumferential direction. The ground wire 12 is compactly organized, for example, by being wound around the outer peripheral portion of the power cable 10.

As shown in FIG. 2, the first bottom wall 411 of the first cover 41 is formed with a first insertion hole 411a for inserting the power cable 10. 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 tubular 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 liquid-tightly seals between the tubular portion 413 and the power cable 10.

The second cover 42 is attached to the first cover 41 so as to cover the sealing portion 13 from the base end side X2. The second cover 42 is formed in a bottomed tubular shape having a second bottom wall 421 on the proximal end side X2 while the distal end side X1 in the axial direction X is open. An annular second flange portion 422 protruding toward the outer peripheral side is formed at the open side end portion of the second cover 42. In the second cover 42, the bolt 65 is inserted into a through hole (not shown) formed so as to penetrate the second flange portion 422 in the axial direction X, and the bolt 65 is provided on the first bottom wall 411 of the first cover 41. It is fixed to the first cover 41 by screwing into a female screw hole (not shown). 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 that liquidally seals between the inner wall of the second insertion hole 421a and the outer peripheral surface of the power cable 10 is interposed.

(Connection part 5)
As shown in FIG. 1, the connecting portion 5 includes a conductor connecting rod 51, a high-voltage shield 52, a fixed terminal 53, and a co-tightening nut 54. In the conductor connecting rod 51, a connecting hole 511 opened in the proximal end side X2 is formed along the axial direction X. A conductor portion 101 exposed from the insulating coating of the power cable 10 is inserted into the connection hole 511, and the end portion of the base end side X2 of the conductor connection rod 51 is crimped toward the conductor portion 101. As a result, 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 from the tip end side X1.

The high-voltage shield 52 is made of a conductor and has a bottomed tubular shape open to the proximal end side X2. The side wall 521 of the high-voltage shield 52 has a cylindrical shape and covers the tip portion of the embedded conductor 22 protruding from the porcelain tube 21 to the tip side X1 from the outer peripheral side. The male screw portion 512 penetrates the bottom wall 522 of the high voltage shield 52.

The fixed terminal 53 has a plate shape and faces the surface of the tip end side X1 of the high voltage shield 52. The fixed terminal 53 is formed with a first hole portion 531 through which a male screw portion 512 is inserted and a second hole portion 532 for connecting the fixed terminal 53 to an electric wire or the like for connecting to the outside. The fixed terminal 53 and the high-pressure shield 52 are co-tightened between the conductor connecting rod 51 and the co-tightening nut 54, whereby the fixed terminal 53, the high-pressure shield 52, and the conductor connecting rod 51 are electrically connected to each other. ing.

(Mounting structure of power cable connection device 1)
Next, with reference to FIG. 6, the mounting structure in which the power cable connecting device 1 of this embodiment is mounted on the roof 71 of the railway vehicle 7 will be described. FIG. 6 is a schematic explanatory view for explaining the mounting structure of the power cable connecting device 1 in the present embodiment.

The roof 71 of the railroad vehicle 7 is formed with an arrangement recess 710 for arranging the pantograph 73 and the power cable connecting device 1. The side wall of the arrangement recess 710 is an inclined wall 72 inclined with respect to the horizontal direction. The inclined wall 72 is formed with a mounting hole 100a penetrating the inclined wall 72, and the flange 3 of the power cable connecting device 1 is fixed by bolts 611 and nuts 612 around the mounting hole 100a in the inclined wall 72. There is. That is, in this embodiment, the inclined wall 72 of the roof 71 of the railway vehicle 7 is the attached member 100.

The work of attaching the power cable connecting device 1 to the inclined wall 72 is performed, for example, by an operator at the location of the tip side X1 of the mounting hole 100a (for example, on the roof 71). A work opening (not shown) for performing work for attaching the power cable connecting device 1 to the inclined wall 72 is formed in the wall portion in the vicinity of the inclined wall 72 in the roof 71. When attaching the power cable connecting device 1 to the inclined wall 72, first, the flange 3 of the power cable connecting 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) through the working opening. The power cable connection device 1 is then attached to the sloping wall 72 by screwing the nut 612 onto the bolt 611. Here, when the positions of the bolt 611 and the nut 612 are opposite to the positions described in this embodiment, the member through hole (see reference numeral 100b in FIG. 2) and the first flange through hole (see reference numeral 33 in FIG. 2). It is necessary to perform the work of aligning the hole of the nut 612 with the tip of the bolt 611 inserted in the work through the work opening, in some cases, in a fumbling state. On the other hand, by setting the positions of the bolt 611 and the nut 612 to the positions described in this embodiment, it is not necessary to align the hole of the nut 612 with the tip of the bolt 611 through the opening for work, which facilitates the work. Can be done.

The power cable connecting device 1 is tilted toward the upper side in the vertical direction (that is, the upper side of the paper surface in FIG. 6) toward the portion where the porcelain tube 21 protrudes from the flange 3 in the horizontal direction (that is, the left side of the paper surface in FIG. 6). It is attached. As a result, the portion of the tip side X1 of the power cable connecting device 1 is arranged closer to the trolley wire 15. The angle formed between the axial direction X and the horizontal direction of the power cable connecting device 1 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 made to coincide with the horizontal direction.

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

(Actions and effects of the first embodiment)
In this embodiment, the first surface 31 of the flange 3 is formed with a first recess 311 for accommodating a fastening member 61 for attaching the flange 3 to the attached member 100. As a result, the fastening member 61 can be arranged in the first recess 311 so as not to protrude from the first recess 311 to the tip side X1, thereby starting from the fastening member 61 in the space of the tip side X1 with respect to the flange 3. It is possible to suppress the occurrence of a discharge.

Here, when the first recess 311 is formed in the flange 3, it is necessary to form the flange 3 thick to some extent so that the first recess 311 is deep enough to accommodate the fastening member 61. Therefore, unless special measures are taken, the dimension of the entire power cable connecting device 1 in the axial direction X may become large.

Therefore, in the power cable connecting device 1 of the present embodiment, the second recess 322 is formed at a position on the inner peripheral side of the first recess 311 on the second surface 32 of the flange 3, and is formed in the second recess 322. The cover 4 is arranged. As a result, it is possible to prevent the cover 4 from protruding significantly from the flange 3 to the proximal end side X2, and even when the first recess 311 is formed in the flange 3, the power cable connecting device 1 can be miniaturized. can do. Along with this, for example, when the power cable connecting device 1 is attached to the roof 71 of the railway vehicle 7 as in the present embodiment, it is possible to prevent the wiring space in the railway vehicle 7 from becoming narrow.

Further, the second concave portion 322 is formed on the inner peripheral side of the outer peripheral concave portion 322a and the outer peripheral concave portion 322a, and is formed so as to be recessed on the side opposite to the cover 4 in the axial direction X from the bottom surface 322d of the outer peripheral concave portion 322a. It is provided with a recess 322b. A cover 4 is arranged in the outer peripheral recess 322a. Further, a fastening member 63 for fastening the flange 3 and the embedded fixing member 26 is arranged in the inner peripheral recess 322b. Therefore, it is possible to provide a fastening member 63 for fastening the flange 3 and the embedded fixing member 26 so as to fit in the inner peripheral recess 322b, and by arranging the fastening member 63, the entire power cable connecting device 1 can be provided. It is possible to prevent the increase in size.

Further, the ground terminal 11 attached to the surface of the base end side X2 of the cover 4 is configured so that the end 121 on the ground terminal 11 side of the ground wire 12 attached to the ground terminal 11 is oriented along the circumferential direction. Has been done. The ground wire 12 is wound around the outer peripheral portion of the power cable 10. Therefore, as shown in FIG. 5, it is easy to wind the ground wire 12 extending from the ground terminal 11 around the outer peripheral portion of the power cable 10. That is, for example, when the end portion 121 on the ground terminal 11 side of the ground wire 12 is in the radial direction and the ground wire 12 is wound around the outer peripheral portion of the power cable 10, the ground wire 12 is wound. It is difficult to wind the ground wire 12 around the outer peripheral portion of the power cable 10 unless it is bent sharply, but in this embodiment, it is easy to wind the ground wire 12 around the outer peripheral portion of the power cable 10 without bending the ground wire 12 sharply. .. Further, the ground wire 12 can be wound around the outer peripheral portion of the power cable 10 without the ground wire 12 bulging significantly toward the outer peripheral side, and the power cable connecting device 1 including the ground wire 12 can be downsized. can.

As described above, according to this embodiment, it is possible to provide a power cable connection device capable of miniaturization.

It is also possible to reverse the positions of the bolt 611 and the nut 612 as the fastening member 61 for attaching the flange 3 to the attached member 100, and to accommodate the head of the bolt 611 in the first recess 311. Further, when the head of the bolt 611 is arranged in the first recess 311, the member through hole 100b of the attached member 100 may be a female screw hole. In this case, the nut can be omitted.

[Second Embodiment]
FIG. 7 is a cross-sectional view of the power cable connecting device 1 in this embodiment. In this embodiment, the porcelain tube 21 is made of a material having a lower rigidity than the epoxy resin. In addition, among the codes used in the second and subsequent embodiments, the same codes as those used in the above-mentioned forms represent the same components and the like as those in the above-mentioned forms, unless otherwise specified. In this embodiment, the description overlapping with the description in the first embodiment will be omitted as appropriate, and the configuration different from the first embodiment will be mainly described.

The main body 2 includes a porcelain tube 21, an embedded conductor 22, a first semi-conductive layer 27a, an embedded fixing member 26, a second semi-conductive layer 27b, and a third semi-conductive layer 27c. In this embodiment, the porcelain tube 21 is made by forming a material having a lower rigidity than an epoxy resin, for example, a polymer-based material into a tubular shape, and has flexibility. As the polymer-based material constituting the porcelain tube 21, for example, silicone rubber, ethylene propylene rubber (EPM), ethylene propylene diene rubber (EPDM) and the like can be adopted. In the present embodiment, the porcelain tube 21 is inserted into the opening 30 of the flange 3, and protrudes from the flange 3 to the tip end side X1 as well as to the proximal end side X2. The porcelain tube 21 has an embedded conductor 22, a first semi-conductive layer 27a, an embedded fixing member 26, a second semi-conductive layer 27b, a third semi-conductive layer 27c, and the like arranged in the mold. It is molded by insert molding in which the molten resin constituting 21 is injected and cured.

The embedded conductor 22 is made of a material having a higher rigidity than the porcelain tube 21, for example, a metal such as brass or an aluminum alloy. The end portion of the base end side X2 of the embedded conductor 22 faces the embedded fixing member 26 in the radial direction via a porcelain tube 21 or the like.

The first semi-conductive layer 27a is provided so as to be interposed between the embedded conductor 22 and the porcelain tube 21. The first semi-conductive layer 27a is formed in a cylindrical shape so as to surround a portion of the embedded conductor 22 excluding the tip portion from the outer peripheral side. Further, the first semi-conductive layer 27a is also interposed between the power cable 10 and the porcelain tube 21 at the base end side X2 of the embedded conductor 22. The first semi-conductive layer 27a is made of, for example, an elastic semi-conductor in which a conductive powder such as carbon is dispersed in silicone rubber, EPM, EPDM or the like to give conductivity. The first semi-conductive layer 27a has a role of preventing the formation of a gap between the embedded conductor 22 and the porcelain tube 21, and the electric field is concentrated near the inner peripheral surface of the porcelain tube 21 to deteriorate the porcelain tube 21. Has a role of suppressing.

The embedded fixing member 26 includes a member cylinder portion 262 and a member flange portion 263. The member cylinder portion 262 is formed in a cylindrical shape, and the member flange portion 263 is formed in an annular shape so as to project from the member cylinder portion 262 toward the outer peripheral side. The embedded fixing member 26 is arranged on the outer peripheral side of the embedded conductor 22 and is arranged so as to face the end portion of the base end side X2 of the embedded conductor 22 via the porcelain tube 21. The embedded fixing member 26 is embedded in the flange tube 21 so that the mating surface portion 263a with the flange 3 provided on the surface of the base end side X2 of the member flange portion 263 is exposed. Further, the embedded fixing member 26 is provided with a female screw hole 261 that opens in the mating surface portion 263a. A bolt 631 for fixing the flange 3 to the embedded fixing member 26 is screwed into the female screw hole 261.

The second semi-conductive layer 27b is provided so as to be interposed between the embedded fixing member 26 and the porcelain tube 21. The second semi-conductive layer 27b is provided over the entire facing region of the embedded fixing member 26 and the porcelain tube 21. Similar to the first semi-conductive layer 27a, the second semi-conductive layer 27b has elastic semi-conductivity in which a conductive powder such as carbon is dispersed in, for example, silicone rubber, EPM, EPDM, etc. to give conductivity. It consists of a body. The second semi-conductive layer 27b has a role of preventing the formation of a gap between the embedded fixing member 26 and the porcelain tube 21, and an electric field is concentrated near the surface of the porcelain tube 21 facing the embedded fixing member 26. It has a role of suppressing deterioration of the electric field tube 21.

The third semi-conductive layer 27c is formed inside the end portion of the base end side X2 of the porcelain tube 21 and exhibits an annular shape. The power cable 10 is inserted into the third semi-conductive layer 27c, and the third semi-conductive layer 27c comes into contact with the outer peripheral surface of the inserted power cable 10. Similar to the first semi-conductive layer 27a and the second semi-conductive layer 27b, the third semi-conductive layer 27c is made conductive by dispersing a conductive powder such as carbon in, for example, silicone rubber, EPM, EPDM or the like. , Consists of an elastic semi-conductor. The surface 27d on the distal end side X1 of the third semi-conductive layer 27c is formed so as to face the outer peripheral side toward the portion of the distal end side X1, thereby filling each part of the surface 27d on the distal end side X1 of the third semi-conductive layer 27c. The distance from the end of the base end side X2 of the lead conductor 22 is made uniform. The third semi-conductive layer 27c has a role of reducing the electric field strength at the proximal end side X2 of the embedded conductor 22.

The surface portion of the main body 2 that contacts the outer peripheral surface of the power cable 10 (that is, the inner peripheral surface of the porcelain tube 21, the inner peripheral surface of the portion of the first semi-conductive layer 27a located on the proximal end side X2 of the embedded conductor 22), and the first The inner peripheral surface of the 3 semi-conductive layer 27c) is smaller than the outer diameter of the portion of the power cable 10 arranged inside the surface portion in the state before the power cable 10 is inserted into the main body portion 2. The power cable 10 is inserted into the main body 2 while expanding the surface portion, and is in close contact with the surface portion in a state of being inserted into the main body portion 2.

(Flange 3)
FIG. 8 is an enlarged cross-sectional view of the vicinity of the flange 3 of FIG. The configuration 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 for accommodating the fastening member 61 for attaching the flange 3 to the attached member 100, and the second surface 32 of the flange 3 has an outer circumference. A second recess 322 composed of a recess 322a and an inner peripheral recess 322b is formed. The flange 3 is provided in the mating surface portion 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 recess 322b communicates with the female screw hole 261 of the embedded fixing member 26. On the other hand, they overlap. Then, the flange 3 is embedded by inserting the bolt 631 as the fastening member 63 into the second flange through hole 34 from the base end side X2 and screwing the bolt 631 into the female screw hole 261 of the embedded fixing member 26. It is bolted to the fixing member 26. As a result, the flange 3 and the porcelain 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 to the proximal end side X2.

(Cover 4)
The cover 4 is formed of brass, an aluminum alloy, or the like in a cylindrical shape, and covers the main body portion 2 protruding from the embedded fixing member 26 to the base end side X2 from the outer peripheral side. At the end of the tip side X1 of the cover 4, a cover flange portion 43 protruding toward the outer peripheral side is formed. The portion of the cover tip side X1 is arranged in the outer peripheral recess 322a of the second recess 322.

The portion of the tip side X1 of the cover 4 is arranged in the outer peripheral recess 322a so as to cover the six 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 at a portion of the cover flange portion 43 that faces the six female screw holes 322c in the axial direction X. The cover 4 is bolted to the flange 3 by inserting a 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 322c. As shown in FIG. 7, the end portion of the base end side X2 of the cover 4 and the power cable 10 are sealed by the sealing portion 13.
Other configurations are the same as those of the first embodiment.

(Actions and effects of the second embodiment)
Also in this embodiment, it has the same actions and effects as those in the first embodiment.

[Third Embodiment]
FIG. 8 is a schematic explanatory view for explaining the mounting structure of the power cable connecting device 1 in the present embodiment. In this embodiment, the power cable connecting device 1 is applied to a vehicle-to-vehicle connection structure of a railway vehicle.

In the present embodiment, the power cable connecting devices 1 are provided in pairs on adjacent railroad vehicles 7 so that their tip sides X1 face each other. Each power cable connecting device 1 is mounted around the mounting hole 100a of the inclined wall 72 inclined at 45 ° or less with respect to the horizontal direction. In the paired power cable connecting devices 1, the fixed terminals (see reference numeral 53 in FIG. 1) in the insulating covers 17 are electrically connected to each other by a flexible electric wire 16.
Other configurations of this embodiment are the same as those of the first embodiment.

(Actions and effects of the third embodiment)
Also in this embodiment, it has the same actions and effects as those in the first embodiment.

(Summary of embodiments)
Next, the technical idea grasped from the embodiment described above will be described with reference to the reference numerals and the like in the embodiment. However, the respective reference numerals and the like in the following description are not limited to the members and the like in which the components within the scope of the claims are specifically shown in the embodiment.

[1] An annular flange (3) into which a power cable (10) is inserted, an annular flange (3) fixed to the porcelain tube (21) and attached to a member to be attached (100), and an axial direction (X). A cover (4) fixed to the flange (3) so as to cover the opening (30) of the flange (3) from one side of the flange (3). The first surface (31), which is the surface opposite to the cover (4) side, has a first recess (61) for accommodating a fastening member (61) for attaching the flange (3) to the attached member (100). 311) is formed, and the second surface (32), which is the surface of the flange (3) on the cover (4) side in the axial direction (X), has an inner circumference than the first recess (311). A power cable connecting device (1) in which a second recess (322) is formed at a position on the side, and the cover (4) is arranged in the second recess (322).

[2] The flange (3) is fixed to the porcelain tube (21) via an embedded fixing member (26) embedded in the porcelain tube (21), and the second recess (322) has an outer circumference. It is formed on the inner peripheral side of the concave portion (322a) and the outer peripheral concave portion (322a), and is recessed on the side opposite to the cover (4) in the axial direction (X) from the bottom surface (322d) of the outer peripheral concave portion (322a). The cover (4) is arranged in the outer peripheral recess (322a), and the flange (3) is provided in the inner peripheral recess (322b). The power cable connection device (1) according to the above [1], wherein the fastening member (63) for fastening the embedded fixing member (26) is arranged.

[3] A ground terminal (11) connected to the ground potential is attached to the surface of the cover (4) opposite to the flange (3), and the ground terminal (11) is the ground terminal. The end portion (131) of the grounding wire (12) attached to the grounding wire (12) on the grounding terminal (11) side is configured to be oriented along the circumferential direction, and the grounding wire (12) is the grounding wire (12). The power cable connecting device (1) according to the above [1] or [2], which is wound around the outer peripheral portion of the power cable (10).

Although the embodiments of the present invention have been described above, the above-described embodiments do not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention. Further, the present invention can be appropriately modified and implemented without departing from the spirit of the present invention.

1 ... Power cable connection device 10 ... Power cable 100 ... Attached member 11 ... Ground terminal 12 ... Ground wire 121 ... End 21 on the ground terminal side ... 碍 tube 26 ... Embedded fixing member 3 ... Flange 30 ... Opening 31 ... No. 1st surface 311 ... 1st recess 32 ... 2nd surface 322 ... 2nd recess 322a ... Outer peripheral recess 322b ... Inner peripheral recess 322d ... Bottom surface of outer peripheral recess 4 ... Cover 61 ... Fastening member (for attaching the flange to the attached member) 63 ... Fastening member X (for fastening the flange and the embedded fixing member) X ... Axial direction

Claims (3)

A porcelain tube to insert the power cable inside,
An annular flange that is fixed to the tube and attached to the attached member,
A cover fixed to the flange so as to cover the opening of the flange from one side in the axial direction is provided.
A first recess for accommodating a fastening member for attaching the flange to the attached member is formed on the first surface of the flange, which is a surface opposite to the cover side in the axial direction.
A second recess is formed on the second surface of the flange, which is the surface on the cover side in the axial direction, at a position on the inner peripheral side of the first recess.
The cover is arranged in the second recess.
Power cable connection device. The flange is fixed to the porcelain tube via an embedded fixing member embedded in the porcelain tube.
The second recess includes an outer peripheral recess and an inner recess formed on the inner peripheral side of the outer peripheral recess and recessed on the side opposite to the cover in the axial direction from the bottom surface of the outer peripheral recess.
The cover is arranged in the outer peripheral recess.
A fastening member for fastening the flange and the embedded fixing member is arranged in the inner peripheral recess.
The power cable connection device according to claim 1. A ground terminal connected to the ground potential is attached to the surface of the cover opposite to the flange.
The ground terminal is configured such that the end of the ground wire attached to the ground terminal on the ground terminal side is oriented along the circumferential direction.
The ground wire is wound around the outer peripheral portion of the power cable.
The power cable connection device according to claim 1 or 2.

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