Power cable connecting device

Abstract

The invention provides a power cable connecting device capable of reducing stress generated in an insulating tube. A power cable connection device (1) is provided with: an insulating tube (22); a tube member (21) which is disposed inside the insulating tube (22) and into which the power cable (10) is inserted; and a mounting member (23) that is disposed so as to surround the tube member (21) from the outer peripheral side, and that is provided to the insulating tube (22) so that a mounting surface (231d), which is mounted to another member, is exposed from the insulating tube (22). The attachment member (23) is divided in the circumferential direction in at least one location.

Description

Technical Field

[0001] The invention relates to a power cable connecting device. Background Art

[0002] Patent document 1 discloses a power cable connection device for connecting a power cable to other electric wires and the like. The power cable connection device described in Patent document 1 includes: an insulating tube; a tube component that is arranged inside the insulating tube and into which the power cable is inserted; and an embedded component that surrounds the tube component from the outer peripheral side and is embedded in the insulating tube. The insulating tube has a first semiconductive portion at an interface with the tube component, and has a second semiconductive portion at an interface with the embedded component.

[0003] Furthermore, the power cable connection device described in Patent Document 1 provides a mold release agent on the surface of the embedded component facing the pipe component side to suppress the fixing of the embedded component and the insulating tube. Thus, the stress caused by the difference in thermal expansion coefficients of the insulating tube, the embedded component and the pipe component is suppressed in the portion between the embedded component and the pipe component in the insulating tube.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-116279 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The power cable connection device described in Patent Document 1 has room for improvement from the viewpoint of reducing stress generated in the insulation tube.

[0009] 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 reducing stress generated in an insulating tube.

[0010] Solutions to Solve Problems

[0011] In order to achieve the above-mentioned object, the present invention provides a cable connection device, which comprises: an insulating tube; a tube component, which is arranged inside the insulating tube and into which a power cable is inserted; and a mounting component, which is arranged so as to surround the tube component from the outer peripheral side and is provided on the insulating tube so that a mounting surface mounted on other components is exposed from the insulating tube, and the mounting component is divided in the circumferential direction at at least one position.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to provide a power cable connection device capable of reducing stress generated in an insulation tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the power cable connection device in the first embodiment.

[0015] Figure 2 Yes Figure 1 An enlarged view of the surrounding area of ​​the mounting components.

[0016] Figure 3 This is an enlarged view of the periphery of the mounting component in the cross-sectional view of the power cable connection device 1 passing through the dividing portion in the first embodiment.

[0017] Figure 4 yes Figure 2 Cross-sectional view taken along line IV-IV.

[0018] Figure 5 It is a perspective view of the mounting member in the first embodiment.

[0019] Figure 6 This is an enlarged cross-sectional view of the periphery of the mounting member of the power cable connection device in the second embodiment.

[0020] Figure 7 yes Figure 6 Cross-sectional view taken along line VII-VII.

[0021] Explanation of symbols

[0022] 1—power cable connecting device, 10—power cable, 21—tube component, 22—insulating tube, 23—installation component, 23a—opposing surface, 230—dividing portion, 231—dividing piece, 231d—installation surface, 24—flange component, 3—cover, 5—gap sealing portion, S—gap. DETAILED DESCRIPTION

[0023] [First embodiment]

[0024] Reference Figures 1 to 5 The first embodiment of the present invention will be described. The embodiments described below are specific examples of preferred embodiments of the present invention, and there are also parts that specifically illustrate various technical matters that are technically preferred, but the technical scope of the present invention is not limited to these specific forms.

[0025] (Power cable connection device 1)

[0026] Figure 1 FIG. 1 is a cross-sectional view of the power cable connection device 1 of this embodiment. Figure 1As shown, the power cable connection device 1 includes a main body 2, a cover 3, and a connection part 4. The main body 2 ensures electrical insulation between the power cable 10 after the layers are stripped and the components arranged around the power cable 10. The cover 3 covers a part of the main body 2. The connection part 4 is a component for connecting the power cable 10 to the outside of the power cable connection device 1. Hereinafter, the direction in which the central axis of the power cable 10 extends is referred to as the axial direction X. In addition, the side of the power cable 10 in the axial direction X that is connected to the connection part 4 is referred to as the front end side X1, and the opposite side is referred to as the base end side X2.

[0027] (Main body 2)

[0028] The main body 2 includes a pipe member 21 , an insulating tube 22 , a mounting member 23 , and a flange member 24 .

[0029] The pipe member 21 is formed of metal such as brass or aluminum alloy into a cylindrical shape that is long in the axial direction X. The pipe member 21 is made of a material that is more rigid than the insulating tube 22. The pipe member 21 is disposed on the inner circumference of the insulating tube 22 to reinforce the flexible insulating tube 22.

[0030] The end portion of the tube member 21 on the front end side X1 protrudes from the insulating tube 22 and is electrically connected to the power cable 10 via the connecting portion 4 described later. In addition, the end portion of the tube member 21 on the base end side X2 is radially opposed to the mounting member 23 via the insulating tube 22. The inner diameter of the tube member 21 is formed to be larger than the outer diameter of the portion of the power cable 10 disposed inside the tube member 21. Thus, the power cable 10 can be easily inserted into the inner side of the tube member 21.

[0031] The insulating tube 22 includes an insulator 220 and semiconductive portions (a first semiconductive portion 221 , a second semiconductive portion 222 , and a third semiconductive portion 223 in this embodiment) provided on the surface of the insulator 220 .

[0032] The insulator 220 is formed of, for example, a polymer material in a tubular shape and has flexibility. As the polymer material constituting the insulator 220, for example, silicone rubber, ethylene propylene rubber (EPM), ethylene propylene diene monomer rubber (EPDM), etc. can be used. In particular, as the material of the insulator 220, by adopting a material with relatively high tear strength, it is easy to suppress the generation of cracks in the insulator 220. In addition, as the material of the insulator 220, by adopting a material with relatively low elastic modulus, it is easy to insert the power cable 10 into the insulator 220. In the free state before the cable is inserted into the insulating tube 22, the inner diameter of the portion of the inner circumference of the insulating tube 22 closer to the base end side X2 than the tube member 21 is smaller than the outer diameter of the power cable 10 inserted therein, and the power cable 10 is inserted into the insulating tube 22 while expanding the portion of the inner circumference of the insulating tube 22 closer to the base end side X2 than the tube member 21.

[0033] On the outer periphery of the insulator 220, annular umbrella portions 220a protruding toward the outer periphery are provided at predetermined intervals at multiple locations in the axial direction X. By forming multiple umbrella portions 220a on the insulator 220, the creeping distance of the outer periphery of the insulator 220 can be ensured, and the occurrence of creeping discharge along the surface of the insulator 220 can be suppressed.

[0034] The insulator 220 is formed by insert molding in which the pipe member 21, the first semiconductive portion 221, the second semiconductive portion 222, the third semiconductive portion 223 and the mounting member 23 are arranged in a mold. Thus, the insulator 220 is formed so as to be fixed to the pipe member 21, the first semiconductive portion 221, the second semiconductive portion 222 and the third semiconductive portion 223, respectively.

[0035] The first semiconductive portion 221, the second semiconductive portion 222, and the third semiconductive portion 223 are made of, for example, a conductive elastic semiconductive material having conductivity obtained by dispersing conductive powder such as carbon in silicone rubber, EPM, EPDM, etc. The first semiconductive portion 221, the second semiconductive portion 222, and the third semiconductive portion 223 suppress surrounding electric field concentration.

[0036] The first semiconductive portion 221 is provided in a film-like manner on the inner peripheral surface of the insulator 220 and is interposed between the insulator 220 and the tube member 21. The first semiconductive portion 221 is formed in a cylindrical shape so as to surround the portion of the tube member 21 except the front end portion from the outer peripheral side. In addition, the first semiconductive portion 221 has a portion extending from the base end side X2 of the tube member 21, and the portion is interposed between the power cable 10 inserted into the inner side of the tube member 21 and the insulator 220. The first semiconductive portion 221 is formed, for example, by insert molding in which the tube member 21 is arranged in a mold. Thus, the first semiconductive portion 221 is fixed to the tube member 21.

[0037] The second semiconductive portion 222 is formed in an annular shape inside the end portion on the base end side X2 of the insulator 220. The second semiconductive portion 222 contacts the outer peripheral surface of the power cable 10 inserted into the insulating tube 22. The second semiconductive portion 222 is formed by molding or the like.

[0038] The third semiconductive portion 223 is interposed between the insulator 220 and the mounting member 23 and is formed in a film shape. The third semiconductive portion 223 is formed, for example, by insert molding in which the mounting member 23 is arranged in a mold. Thus, the third semiconductive portion 223 is fixed to the mounting member 23. In addition, the third semiconductive portion 223 is also extended from the portion in contact with the inner peripheral surface of the mounting member 23 toward the base end side X2.

[0039] Figure 2 Yes Figure 1 An enlarged view of the periphery of the mounting component 23. Figure 3This is an enlarged view of the periphery of the mounting member 23 of a cross-sectional view of the power cable connection device 1 passing through a dividing portion 230 described later. Figure 4 yes Figure 2 Cross-sectional view taken along line IV-IV. Figure 5 is a three-dimensional diagram of the mounting component 23. Figures 1 to 3 In FIG. 1 , the outer shape position of the mounting component 23 is indicated by a dotted line.

[0040] The mounting member 23 is arranged so as to surround the end portion of the base end side X2 of the pipe member 21 from the outer peripheral side. A portion of the mounting member 23 is embedded in the insulating tube 22. The mounting member 23 is made of a material having higher rigidity than the insulating tube 22, such as a metal such as brass or aluminum alloy, and is connected to the ground potential when the power cable connection device 1 is in use. The thermal expansion coefficients of the pipe member 21 and the mounting member 23 are each smaller than the thermal expansion coefficient of the insulator 220.

[0041] Here, since the insulating tube 22, the mounting member 23, and the pipe member 21 are in close contact with each other (more specifically, fixed), unless special efforts are made, excessive stress may be generated in the insulating tube 22 due to the difference in thermal expansion coefficients.

[0042] Therefore, in the present embodiment, the mounting member 23 is divided in the circumferential direction at least at one location. Thus, the mounting member 23 can be displaced or deformed in a manner following the thermal expansion and contraction of the insulating tube 22 before the mounting member 23 is fixed to the flange member 24, thereby reducing the stress generated in the insulating tube 22. In particular, when the insulator 220 is molded, the insulator 220 is greatly thermally contracted, so that hardening deformation is easily generated, and residual deformation is easily left in the insulator 220. However, by dividing the mounting member 23, the mounting member 23 can be displaced or deformed following the insulating tube 22, and residual deformation is unlikely to remain in the insulating tube 22.

[0043] In this embodiment, the mounting member 23 is divided in the circumferential direction at a plurality of locations and is composed of a plurality of divided pieces 231. Specifically, the mounting member 23 is divided in the circumferential direction at two locations and is composed of two divided pieces 231. Hereinafter, the region of the mounting member 23 divided in the circumferential direction (i.e., the region between the two divided pieces 231 of the mounting member 23 in the circumferential direction) is referred to as a dividing portion 230.

[0044] The two divisions 230 of the mounting component 23 are formed at positions on opposite sides of 180° to each other in the circumferential direction. In this embodiment, the divisions 230 are formed to be parallel to the axial direction X. That is, the mounting component 23 has a shape such that a cylindrical component is divided in half in the axial direction X. In addition, the mounting component 23 only needs to be divided in the circumferential direction, and the divisions 230 may not be parallel to the axial direction X. In addition, the mounting component 23 may also be divided in the circumferential direction at one location or at three or more locations. The fewer the number of divisions of the mounting component 23, the fewer the number of parts constituting the mounting component 23, and the greater the number of divisions, the easier it is to reduce the stress generated in the insulating tube 22, so the number of divisions can be appropriately determined in consideration of these.

[0045] In this embodiment, a gap is formed between the opposing surfaces 32a that face each other across the partition 230. The gap between the opposing surfaces 23a is a small gap to the extent that the partitions 231 do not abut against each other when the partitions 231 are thermally expanded or thermally contracted. For example, the width of the partition 230 (for example, Figure 2 The dimension in the vertical direction) is smaller than the thickness of the tube member 21. In this embodiment, when the third semiconductive portion 223 is formed by insert molding in which the mounting member 23 is arranged in the mold, a part of the third semiconductive portion 223 is also filled in the two divided portions 230.

[0046] The split piece 231 includes an arc-shaped portion 231 a formed in an arc shape, and a protruding portion 231 b formed so as to protrude toward the outer peripheral side from an end portion on the base end side X2 of the arc-shaped portion 231 a .

[0047] The third semiconductive part 223 is fixed to the outer peripheral surface of the protruding part 231b and the surface other than the mounting surface 231d of the split piece 231. In order to improve the close contact with the third semiconductive part 223, the corners of the portion of the surface of the split piece 231 fixed to the third semiconductive part 223 are rounded. In addition, the end of the base end side X2 of the inner peripheral surface of the split piece 231 is an inclined surface 231c that expands toward the base end side X2. As a result, the angle between the inclined surface 231c and the mounting surface 231d described later becomes larger, and the close contact between the inclined surface 231c of the surface of the split piece 231 and the inner surface of the third semiconductive part 223 is improved.

[0048] The surface on the base end side X2 of the split piece 231 constitutes a mounting surface 231d mounted on the flange member 24. The mounting surface 231d is exposed from the insulating tube 22 when the split piece 231 is assembled to the insulating tube 22. In addition, an internal threaded hole 231e opened on the mounting surface 231d is formed in the split piece 231. The internal threaded hole 231e is threadedly engaged with a bolt B1 for fixing the flange member 24 to the split piece 231.

[0049] The flange member 24 is formed in an annular shape. The flange member 24 is fixed to the mounting member 23 by the bolt B1 in a state where the flange member 24 overlaps with the mounting surface 231d. The flange member 24 is formed with a bolt insertion hole 241 through which a bolt (not shown) for mounting the flange member 24 on the mounting object 100 is inserted. In addition, the flange member 24 is formed with an internal thread hole 242 opened on the surface of the base end side X2. The bolt B2 for fixing the cover 3 to the flange member 24 is threadedly engaged in the internal thread hole 242. Seal portions 11a and 11b for ensuring water tightness are arranged between the flange member 24 and the mounting member 23 and the cover 3.

[0050] (cover 3)

[0051] like Figure 1 As shown, the cover 3 is formed of brass, aluminum alloy, etc. into a cylindrical shape, and covers the main body 2 protruding from the flange member 24 to the base end side X2 from the outer peripheral side. A cover flange portion 31 protruding to the outer peripheral side is formed at the end portion of the front end side X1 of the cover 3. The cover flange portion 31 is fixed to the flange member 24 using bolts B2.

[0052] The end of the base end side X2 of the cap 3 and the power cable 10 are sealed by the sealing portion 12. The sealing portion 12 is formed by winding a polyethylene tape or epoxy tape provided with an adhesive material around the outer periphery of the power cable 10, and seals the cap 3 and the power cable 10 watertightly.

[0053] (Connection 4)

[0054] The connection portion 4 includes a conductor connection rod 41, a high-voltage shielding member 42, a fixed terminal 43, and a common fastening nut 44. A rivet hole 411 is formed in the conductor connection rod 41, which is open at the base end side X2. The conductor portion 101 exposed from the insulating cover portion of the power cable 10 is inserted into the rivet hole 411, and the end portion of the base end side X2 of the conductor connection rod 41 is riveted toward the conductor portion 101. Thus, the conductor connection rod 41 is connected to the power cable 10. In addition, an external thread portion 412 protruding toward the front end side X1 is formed in the conductor connection rod 41. The external thread portion 412 penetrates the high-voltage shielding member 42 and the fixed terminal 43, respectively.

[0055] The high-voltage shield 42 is made of a conductor and has a bottomed cylindrical shape that is open at the base end side X2. The high-voltage shield 42 is fitted onto the front end portion of the pipe member 21 that protrudes from the insulating tube 22 toward the front end side X1.

[0056] The fixed terminal 43 is plate-shaped and overlaps the high-voltage shield 42 from the front end side X1. A connection hole 431 for connecting to an external electric wire or the like is formed in the fixed terminal 43. The fixed terminal 43 and the high-voltage shield 42 are fastened together between the conductor connecting rod 41 and the common fastening nut 44, whereby the fixed terminal 43, the high-voltage shield 42 and the conductor connecting rod 41 are electrically connected to each other.

[0057] (Use example of the power cable connection device 1)

[0058] Next, a usage example of the power cable connection device 1 of this embodiment will be described.

[0059] The power cable connection device 1 is installed on the roof of a railway vehicle, for example. In this case, a wall portion constituting the roof of the railway vehicle, a housing provided on the roof of the railway vehicle and housing the power cable connection device 1, etc., become the installation object 100. The power cable connection device 1 can be used for purposes such as electrical connection between adjacent railway vehicles and electrical connection with a pantograph.

[0060] (Functions and Effects of First Embodiment)

[0061] In the power cable connection device 1 of this embodiment, the mounting member 23 is divided in the circumferential direction at at least one location. Therefore, the mounting member 23 can be displaced or deformed following the thermal expansion and contraction of the insulating tube 22, thereby reducing the stress generated in the insulating tube 22.

[0062] The mounting member 23 is divided at a plurality of locations in the circumferential direction and is composed of a plurality of divided pieces 231. Therefore, the divided pieces 231 can be displaced following the thermal expansion and contraction of the insulating tube 22, and the stress generated in the insulating tube 22 can be further reduced.

[0063] In addition, the mounting member 23 is divided into two parts in the circumferential direction. Thus, the mounting member 23 can be displaced following the thermal expansion and contraction of the insulating tube 22, and the number of parts is reduced, thereby suppressing a decrease in productivity of the power cable connection device 1.

[0064] In addition, a gap is formed between the opposing surfaces 23a of the mounting member 23 that are opposed across the dividing portion 230. Therefore, the mounting member 23 can be displaced or deformed not only in a direction to increase the width of the dividing portion 230 but also in a direction to decrease the width of the dividing portion 230, and the stress generated in the insulating tube 22 can be further reduced.

[0065] As described above, according to this aspect, it is possible to provide a power cable connection device capable of reducing stress generated in an insulation tube.

[0066] [Second embodiment]

[0067] Reference Figure 6 as well as Figure 7 A second embodiment of the present invention will be described. Figure 6 It is an enlarged cross-sectional view of the periphery of the mounting member 23 of the power cable connection device 1 . Figure 7 yes Figure 6 Cross-sectional view taken along line VII-VII.

[0068] This embodiment is a embodiment in which a gap sealing portion 5 is further provided compared to the first embodiment. The gap sealing portion 5 prevents moisture and the like from entering the gap S between the portion of the insulating tube 22 located on the outer peripheral side of the mounting member 23 and the flange member 24. Thus, moisture and the like are prevented from entering the space inside the cover 3 from the gap S through the boundary between the flange member 24 and the mounting member 23.

[0069] The gap S is formed between the later-described opposing wall 243 in the axial direction X of the flange member 24 and a portion of the insulating tube 22 formed on the outer peripheral side of the mounting member 23 in the axial direction X. The opposing wall 243 is formed in the flange member 24 so as to protrude toward the front end side X1 and is annularly opposed to the outer peripheral surface of the protruding portion 231b of the mounting member 23 in the radial direction. The gap S is formed over the entire circumference.

[0070] In the present embodiment, the gap sealing portion 5 is formed in a manner to block the gap S from the outer peripheral side. The gap sealing portion 5 is formed over the entire circumference to block the gap S formed over the entire circumference. The gap sealing portion 5 can be composed of, for example, putty, a belt component, etc. In the case where the gap sealing portion 5 is composed of putty, as an example, the gap sealing portion 5 can be arranged in at least a portion of the gap S, and is applied on the outer peripheral side of the gap S in a manner that straddles the opposing wall 243 and the insulating tube 22. In the case where the gap sealing portion 5 is composed of a belt component, as an example, the gap sealing portion 5 is wound at least once on the outer peripheral side of the gap S in a manner that straddles the opposing wall 243 and the insulating tube 22. Figure 6 , an example is shown in which the gap sealing portion 5 is composed of putty and the gap sealing portion 5 also enters the gap S, but when the gap sealing portion 5 is composed of a tape member, the gap sealing portion 5 is not arranged in the gap S, but is arranged only on the outer peripheral side of the gap S. In addition, the gap sealing portion 5 may be composed of both putty and a tape member, for example. In this case, for example, the gap S may be filled with putty, and the outer peripheral side of the putty may be further wound with a tape member.

[0071] In this embodiment, since there is the gap sealing portion 5, a sealing portion between the mounting member 23 and the flange member 24 is not required (see Figures 1 to 3 In this embodiment, the space inside the cover 3 is composed of the gap sealing portion 5 and the sealing portion (refer to Figure 1 Symbol 12), the sealing part 11b ensures water tightness.

[0072] The rest is the same as that of the first embodiment.

[0073] In addition, among the reference numerals used in the second embodiment and thereafter, the same reference numerals as those used in the existing embodiment represent the same components as those in the existing embodiment unless otherwise indicated.

[0074] (Functions and Effects of Second Embodiment)

[0075] The power cable connection device 1 of this embodiment further includes a gap sealing portion 5 that seals the gap S. Therefore, foreign matter such as moisture can be prevented from entering the inside of the power cable connection device 1 (for example, the inner space of the cover) from the gap S.

[0076] Otherwise, the same operations and effects as those of the first embodiment are achieved.

[0077] (Summary of Implementation Methods)

[0078] Next, the technical ideas grasped from the above-described embodiments are described by citing the symbols in the embodiments. However, the symbols in the following description are not limited to specifically indicating the components in the claims as the components in the embodiments.

[0079] [1] A power cable connection device 1 comprises: an insulating tube 22; a tube member 21, which is arranged inside the insulating tube 22 and into which a power cable 10 is inserted; and a mounting member 23, which is arranged so as to surround the tube member 21 from the outer circumference and is provided on the insulating tube 22 so that a mounting surface 231d for mounting on other members is exposed from the insulating tube 22, and the mounting member 23 is divided in the circumferential direction at at least one position.

[0080] [2] The power cable connection device 1 according to [1], wherein the mounting member 23 is divided in a circumferential direction at a plurality of locations and is composed of a plurality of divided pieces 231 .

[0081] [3] The power cable connection device 1 according to [2], wherein the mounting member 23 is divided into two parts in the circumferential direction.

[0082] [4] The power cable connection device 1 according to any one of [1] to [3], wherein a space is formed between the opposing surfaces 23 a of the mounting member 23 that are opposed to each other across the dividing portion 230 .

[0083] [5] The power cable connection device 1 according to any one of [1] to [4] further comprises: a flange part 24, which is fixed to the mounting part 23 so as to overlap with the mounting surface 231d of the mounting part 23; a cover 3, which is located on the side of the flange part 24 opposite to the mounting part 23 and surrounds the insulating tube 22; and a gap sealing portion 5, which seals the gap S between the portion of the insulating tube 22 located on the outer peripheral side of the mounting part 23 and the flange part 24.

[0084] The embodiments of the present invention are described above, but the above embodiments do not limit the invention involved in the claims. In addition, it should be noted that the combination of features described in the embodiments is not necessarily necessary for all means to solve the problems of the invention. In addition, the present invention can be implemented by appropriately deforming within the scope of its purpose.

Claims

1. A power cable connection device, characterized in that: have: Insulation tube; a pipe member which is arranged inside the insulating tube and into which the power cable is inserted; and a mounting member arranged so as to surround the tube member from the outer peripheral side and provided on the insulating tube so that a mounting surface to be mounted on another member is exposed from the insulating tube, The mounting member is divided in the circumferential direction at at least one location.

2. The power cable connection device according to claim 1, characterized in that: The mounting member is divided in a circumferential direction at a plurality of locations and is composed of a plurality of divided pieces.

3. The power cable connection device according to claim 2, characterized in that: The mounting member is divided into two parts in the circumferential direction.

4. The power cable connection device according to claim 1 or 2, characterized in that: A space is formed between opposing surfaces of the mounting member that face each other across the dividing portion.

5. The power cable connection device according to claim 1 or 2, characterized in that: Also available: a flange member fixed to the mounting member so as to overlap with the mounting surface of the mounting member; a cover located on a side of the flange member opposite to the mounting member side and surrounding the insulating tube; as well as A gap sealing portion seals a gap between a portion of the insulating tube located on an outer peripheral side of the mounting member and the flange member.

Images