Power cable connecting device

Abstract

The invention provides a power cable connecting device which suppresses generation of stress on an insulating tube and concentration of an electric field in the insulating tube. A power cable connection device (1) is provided with: an insulating tube (21) into which a power cable (10) is inserted; a tube member (22) which is provided inside the insulating tube (21) and which surrounds the power cable (10); and a mounting member (23) which is provided on the outer peripheral side of the tube member (22) and which has a part embedded in the insulating tube (21) such that a mounting surface (233) mounted to another member is exposed from the insulating tube (21). The insulating tube (21) has an insulator (210), a first semiconductive portion (211) between the insulator (210) and the tube member (22), and a second semiconductive portion (212) between the insulator (210) and the mounting member (23). The base end of the tube member (22) is positioned closer to the tip side (X1) than the attachment member (23). The first semiconductive section (211) has a portion that faces the second semiconductive section (212) in the radial direction.

Description

Technical Field

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

[0002] In Patent Document 1, a power cable connection device for connecting a power cable to other electric wires or the like is disclosed. The power cable connection device described in Patent Document 1 includes an insulating tube made of a polymer-based material, a tube member disposed inside the insulating tube, and a mounting member that surrounds the tube member from the outer peripheral side and is partially buried in the insulating tube. The insulating tube has an insulator, a first semiconductive portion formed between the insulator and the tube member, and a second semiconductive portion formed between the insulator and the mounting member.

[0003] Moreover, Patent Document 1 discloses an example in which the tube member is formed shorter so as not to face the mounting member in the radial direction, and a portion sandwiched between the tube member and the mounting member in the radial direction is not formed on the insulating tube. If the above-described portion is generated, stress caused by the difference in the coefficient of thermal expansion of the tube member, the insulating tube, and the mounting member is likely to be generated at the above-described portion. According to the above example, the stress generated in the insulating tube can be reduced.

[0004] It should be noted that in the above example of Patent Document 1, the first semiconductive portion is formed shorter so as not to face the second semiconductive portion in the radial direction.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2022-128719 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] In the above example, the end portion on the base end side of the first semiconductive portion having a relatively small radius of curvature and the end portion on the front end side of the second semiconductive portion are in positions close to each other. Therefore, the electric field tends to concentrate in the portion between the first semiconductive portion and the second semiconductive portion in the insulating tube.

[0010] The present invention has been made in view of the above circumstances, and an object thereof is to provide a power cable connection device capable of suppressing the generation of stress in the insulating tube and suppressing the concentration of the electric field in the insulating tube.

[0011] Means for Solving the Problems

[0012] In order to achieve the above object, the present invention provides a power cable connection device, which includes an insulating tube into which a power cable is inserted on the inner side, a tube member disposed inside the insulating tube and surrounding the power cable, and a mounting member. The mounting member is disposed on the outer peripheral side of the tube member, and a part of the mounting member is buried in the insulating tube so that a mounting surface for mounting on other members is exposed from the insulating tube. The insulating tube has an insulator, a first semiconductive portion provided between the insulator and the tube member, and a second semiconductive portion provided between the insulator and the mounting member. When the side of the insulating tube into which the power cable is inserted is taken as the base end side and the opposite side is taken as the front end side, the base end position of the tube member is located on the front end side of the mounting member, and the first semiconductive portion has a portion that is radially opposed to the second semiconductive portion.

[0013] Advantages of the Invention

[0014] According to the present invention, it is possible to provide a power cable connection device that can suppress the generation of stress in the insulating tube and suppress the electric field concentration in the insulating tube. Description of the Drawings

[0015] Figure 1 is a cross-sectional view of the power cable connection device in the embodiment.

[0016] Figure 2 is Figure 1 a partially enlarged view of

[0017] Figure 3 is Figure 1 a cross-sectional view taken along the line III-III of

[0018] Description of the Reference Numerals

[0019] 1... Power cable connection device, 10... Power cable, 21... Insulating tube, 210... Insulator, 210a... Peak portion, 210b... Large-diameter valley portion (valley portion), 210c... Medium-diameter valley portion (valley portion), 210d... Small-diameter valley portion (valley portion), 211... First semiconductive portion, 212... Second semiconductive portion, 22... Tube member, 23... Mounting member, 233... Mounting surface, C... Axial center position, X... Axial direction, X1... Front end side, X2... Base end side. Detailed Embodiment

[0020] [Embodiment]

[0021] Refer to Figures 1 to 3An embodiment of the present invention will be described. It should be noted that the embodiments described below are shown as preferred specific examples for implementing the present invention. Although various technically preferred technical matters are specifically illustrated in part, the technical scope of the present invention is not limited to this specific manner.

[0022] (Power cable connection device 1)

[0023] Figure 1 is a cross-sectional view of the cable connection device 1 of this embodiment. As Figure 1 shown, the power cable connection device 1 includes a main body portion 2, a cover 3, and a connection portion 4. The main body portion 2 ensures electrical insulation between the power cable 10 that has been stagewise peeled and the members disposed around the power cable 10. The cover 3 covers a part of the main body portion 2. The connection portion 4 is a member for connecting the power cable 10 to the outside of the power cable connection device 1. Hereinafter, the axial direction of the cable connection device 1 will be referred to as the axial direction X. The axial direction X is the direction in which the central axis of the power cable 10 (i.e., Figure 1 the single-dot chain line) extends in the state where the power cable 10 is inserted into the power cable connection device 1. In addition, one side of the axial direction X, that is, the side of the insulating tube 21 into which the power cable 10 is inserted, is referred to as the proximal end side X2, and the opposite side is referred to as the distal end side X1. In other words, the distal end side X1 is the side of the power cable 10 that is inserted into the insulating tube 21, and the proximal end side X2 is the side of the power cable 10 that is led out from the insulating tube 21. In addition, when simply referred to as the "radial direction", it means the radial direction centered on the central axis of the power cable 10. In addition, one side of the radial direction, that is, the direction toward the central axis of the power cable 10, is referred to as the inner peripheral side, and the opposite side is referred to as the outer peripheral side.

[0024] (Main body portion 2)

[0025] The main body portion 2 includes an insulating tube 21, a tube member 22, a mounting member 23, and a flange member 24.

[0026] The insulating tube 21 includes an insulator 210 and semiconductive portions (in this embodiment, a first semiconductive portion 211, a second semiconductive portion 212, and a third semiconductive portion 213) provided on the surface of the insulator 210.

[0027] The insulator 210 is formed by shaping a polymer-based material into a tubular shape and has flexibility. As the polymer-based material constituting the insulator 210, for example, silicone rubber, ethylene propylene rubber (EPM), ethylene propylene diene monomer rubber (EPDM), etc. can be adopted. In particular, as the material of the insulator 210, by adopting a material with a relatively high tear strength, it is easy to suppress the generation of cracks in the insulator 210. In addition, as the material of the insulator 210, by adopting a material with a relatively low elastic modulus, it is easy to insert the power cable 10 into the insulator 210. Regarding the portion of the inner peripheral surface of the insulating tube 21 closer to the base end side X2 than the tube member 22, in the free state before the cable is inserted into the insulating tube 21, it is smaller than the outer diameter of the power cable 10 inserted into the inside thereof, and the power cable 10 is inserted into the insulating tube 21 while expanding the portion of the inner peripheral surface of the insulating tube 21 closer to the base end side X2 than the tube member 22.

[0028] The outer peripheral portion of the insulator 210 has a plurality of peak portions 210a and valley portions 210b to 210d alternately formed in the axial direction. In other words, the insulator 210 has peak portions 210a protruding outward in the peripheral direction at a plurality of positions in the axial direction X, and the portions between adjacent peak portions 210a on the outer peripheral surface of the insulating tube 21 constitute the valley portions 210b to 210d.

[0029] The plurality of peak portions 210a are formed to protrude outward in the peripheral direction over the entire circumference of the insulating tube 21 and are in a circular ring shape. The plurality of peak portions 210a ensure the creepage distance of the outer peripheral surface of the insulator 210 and suppress the generation of creepage discharge along the surface of the insulator 210.

[0030] The plurality of valley portions 210b to 210d are formed more on the inner peripheral side as they are closer to the front end side X1. In the present embodiment, the plurality of valley portions 210b to 210d are formed to be located more on the inner peripheral side in a stepwise manner as they are closer to the front end side X1. Specifically, the plurality of valley portions 210b to 210d sequentially have two large-diameter valley portions 210b with equal radial positions from the base end side X2, one medium-diameter valley portion 210c located on the inner peripheral side of the large-diameter valley portion 210b, and nine small-diameter valley portions 210d with equal radial positions located on the inner peripheral side of the medium-diameter valley portion 210c and are located on the inner peripheral side in the order of the large-diameter valley portion 210b, the medium-diameter valley portion 210c, and the small-diameter valley portion 210d starting from the base end side X2. Among the plurality of valley portions 210b to 210d, the valley portions 210b to 210d (i.e., the medium-diameter valley portion 210c and the small-diameter valley portion 210d) other than the valley portion located on the outermost peripheral side (i.e., the large-diameter valley portion 210b) are formed at positions farther from the front end side X1 than the mounting member 23.

[0031] The insulator 210 is formed by insert molding in a mold with the mounting member 23 having a first semiconductive portion 211, a second semiconductive portion 212, and a third semiconductive portion 213 formed on its surface. Thus, the insulator 210 is formed to be fixed to the first semiconductive portion 211, the second semiconductive portion 212, and the third semiconductive portion 213 respectively.

[0032] The first semiconductive portion 211, the second semiconductive portion 212, and the third semiconductive portion 213 are made of an elastic semiconductive material having conductivity by dispersing conductive powder such as carbon in silicone rubber, EPM, EPDM, etc. The first semiconductive portion 211, the second semiconductive portion 212, and the third semiconductive portion 213 suppress the concentration of the electric field around them.

[0033] The first semiconductive portion 211 is provided in a film shape on the inner peripheral surface of the insulator 210 and is interposed between the insulator 210 and the tube member 22. The detailed shape of the first semiconductive portion 211 will be described later. The first semiconductive portion 211 is formed, for example, by insert molding with the tube member 22 placed in a mold. Thus, the first semiconductive portion 211 is fixed to the mounting member 23.

[0034] As Figure 1 and Figure 2 shown, the second semiconductive portion 212 is provided in a film shape between the insulator 210 and the mounting member 23. The second semiconductive portion 212 is formed, for example, by insert molding with the mounting member 23 placed in a mold. Thus, the second semiconductive portion 212 is fixed to the mounting member 23.

[0035] As Figure 1 shown, the third semiconductive portion 213 is formed inside the end portion on the base end side X2 of the insulator 210 and is ring-shaped. The third semiconductive portion 213 contacts the exposed outer peripheral surface of the power cable 10 inserted into the insulating tube 21. The third semiconductive portion 213 is formed by molding with a mold or the like.

[0036] The tube member 22 is disposed on the inner peripheral surface of the insulating tube 21. The tube member 22 is formed by shaping a metal such as brass or aluminum alloy into a cylindrical shape (specifically, a circular cylindrical shape) that is long in the axial direction X. The tube member 22 is made of a material with higher rigidity than the insulating tube 21. The tube member 22 is disposed on the inner peripheral side of the insulating tube 21 to reinforce the flexible insulating tube 21.

[0037] The end portion on the front end side X1 of the tube member 22 protrudes from the insulating tube 21 and is electrically connected to the power cable 10 via a connection portion 4 described later.

[0038] Figure 2 is a magnified view of a part of Figure 1 . As Figure 1 and Figure 2As shown, the proximal end position of the pipe member 22 is located on the front end side X1 relative to the mounting member 23. In this way, by staggering the pipe member 22 and the mounting member 23 in the axial direction X, the stress generated in the insulating pipe 21 can be reduced. For example, different from this embodiment, when the pipe member 22 and the mounting member 23 are opposed to each other in the radial direction, the clamping portion, which is the portion of the insulating pipe 21 clamped between the pipe member 22 and the mounting member 23 in the radial direction, hinders the radial thermal expansion and thermal contraction, and stress is likely to be generated. In particular, when both the pipe member 22 and the mounting member 23 are fixed to the insulating pipe 21, when the insulating pipe 21 is to thermally contract, the clamping portion is stretched by the mounting member 23, so that stress is likely to be generated. When the insulating pipe 21 is to thermally expand, the clamping portion is stretched by the pipe member 22, so that stress is likely to be generated. On the other hand, in the present embodiment, since the proximal end position of the pipe member 22 is set to a position on the front end side X1 relative to the mounting member 23, the generation of the above-mentioned stress can be suppressed. As Figure 2 shown, from the viewpoint of suppressing the stress generated in the insulating pipe 21, the length L1 in the axial direction X between the pipe member 22 and the mounting member 23 is preferably larger than the length L2 between the pipe member 22 and the mounting member 23 in the radial direction.

[0039] In addition, if the proximal end position of the pipe member 22 is too far from the front end side X1 of the mounting member 23, the strengthening function of the pipe member 22 for the insulating pipe 21 may be impaired. Therefore, as Figure 1 shown, it is preferable that the proximal end position of the pipe member 22 is located on the proximal end side X2 relative to the axial center position C of the portion on the front end side X1 of the insulating pipe 21 relative to the mounting member 23. In addition, it is preferable to design the proximal end position of the pipe member 22 such that the pipe member 22 is located on the inner peripheral side of the innermost peripheral valley portion (that is, the plurality of small-diameter valley portions 210d) among the plurality of valley portions 210b to 210d. This is because the thickness of the portion of the insulating pipe 21 where the small-diameter valley portion 210d exists among the plurality of valley portions 210b to 210d is thin, and thus strengthening is particularly required.

[0040] The inner diameter of the pipe member 22 is formed to be larger than the outer diameter of the portion of the power cable 10 disposed inside the pipe member 22. Thereby, it is easy to insert the power cable 10 inside the pipe member 22.

[0041] As described above, the first semiconductive portion 211 is interposed between the pipe member 22 and the insulator 210. The first semiconductive portion 211 has an enclosing portion 211a formed in a cylindrical shape so as to surround the outer peripheral surface of the pipe member 22 and an extending portion 211b extending from the enclosing portion 211a toward the proximal end side X2. The enclosing portion 211a surrounds the portion of the pipe member 22 other than the front end portion from the outer peripheral side.

[0042] The extended setting portion 211b is formed at a position closer to the inner peripheral side than the pipe member 22 and has a thickness larger than that of the surrounding portion 211a. The extended setting portion 211b is interposed between the power cable 10 inserted inside the pipe member 22 and the insulator 210. The extended setting portion 211b has a portion that is radially opposed to the second semiconductive portion 212. In the present embodiment, the extended setting portion 211b is formed to a position closer to the proximal end side X2 than the mounting member 23 so as to be radially opposed to the entire inner peripheral surface of the mounting member 23.

[0043] As Figure 2 shown, the mounting member 23 is disposed on the outer peripheral side of the pipe member 22. The mounting member 23 is formed in a cylindrical shape so as to surround the proximal end side X2 of the pipe member 22 from the outer peripheral side. The mounting member 23 includes a cylindrical portion 231 formed in a cylindrical shape and an annular protruding portion 232 formed so as to protrude from the end portion of the proximal end side X2 of the cylindrical portion 231 toward the outer peripheral side.

[0044] The mounting member 23 is made of a material having a higher rigidity than the insulating pipe 21, such as a metal such as brass or aluminum alloy, and is connected to the ground potential in the use state of the power cable connection device 1. The thermal expansion coefficients of the pipe member 22 and the mounting member 23 are each smaller than the thermal expansion coefficient of the insulator 210.

[0045] The mounting member 23 is partially buried in the insulating pipe 21 such that the mounting surface 233, which is the surface for mounting the flange member 24, is exposed from the insulating pipe 21. An internal threaded hole 234 that opens in the mounting surface 233 is formed in the mounting member 23. The internal threaded hole 234 is screwed with a bolt B1 for fixing the flange member 24 to the mounting member 23.

[0046] The flange member 24 is formed in a ring shape. The flange member 24 is fixed to the mounting member 23 by a bolt B1 in a state where it coincides with the mounting surface 233. A bolt insertion hole 241 through which a bolt (not shown) for mounting the flange member 24 to the mounting object 100 is inserted is formed in the flange member 24. In addition, an internal threaded hole 242 that opens in the surface on the proximal end side X2 is formed in the flange member 24. A bolt B2 for fixing the cover 3 to the flange member 24 is screwed into the internal threaded hole 242. A sealing portion 11 for ensuring watertightness is disposed between the flange member 24 and the mounting member 23 and between the flange member 24 and the cover 3.

[0047] (Cover 3)

[0048] As Figure 1 shown, the cover 3 is formed in a cylindrical shape from brass, aluminum alloy, etc., and covers the main body portion 2 protruding from the flange member 24 toward the proximal end side X2 from the outer peripheral side. A cover flange portion 31 that protrudes toward the outer peripheral side is formed at the end portion on the front end side X1 of the cover 3. The cover flange portion 31 is fixed to the flange member 24 using a bolt B2.

[0049] The end portion of the base end side X2 of the cover 3 and the power cable 10 are sealed by a sealing portion 12. The sealing portion 12 is formed by winding a polyethylene tape, an epoxy tape, etc. provided with an adhesive material around the outer peripheral portion of the power cable 10, and seals the space between the cover 3 and the power cable 10 in a watertight manner.

[0050] (Connection portion 4)

[0051] The connection portion 4 includes a conductor connecting rod 41, a high-voltage shield 42, a fixed terminal 43, and a common fastening nut 44. A riveting hole 411 that opens to the base end side X2 is formed in the conductor connecting rod 41. The cable conductor 101 exposed from the power cable 10 is inserted into the riveting hole 411, and the end portion of the base end side X2 of the conductor connecting rod 41 is riveted toward the cable conductor 101. Thus, the conductor connecting rod 41 is connected to the power cable 10. In addition, an external thread portion 412 that protrudes toward the front end side X1 is formed in the conductor connecting rod 41. The external thread portion 412 penetrates through the high-voltage shield 42 and the fixed terminal 43, respectively.

[0052] The high-voltage shield 42 is made of a conductor and has a bottomed cylindrical shape that opens to the base end side X2. The high-voltage shield 42 is externally fitted to the front end portion of the pipe member 22 that protrudes toward the front end side X1 from the insulating pipe 21.

[0053] The fixed terminal 43 has a plate shape and overlaps the high-voltage shield 42 from the front end side X1. A connection hole 431 for connecting to an external wire or the like is formed in the fixed terminal 43. The fixed terminal 43 and the high-voltage shield 42 are commonly fastened 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.

[0054] (Power cable 10)

[0055] Figure 3 is Figure 1 a cross-sectional view taken along the line III-III. As Figure 3 shown, the power cable 10 sequentially includes a cable conductor 101, a cable inner semiconductive layer 102, a cable insulator 103, a cable outer semiconductive layer 104, a cable shielding layer 105, and a cable sheath 106 from the center. The power cable 10 is gradually peeled in such a manner that the cable conductor 101, the cable insulator 103, the cable outer semiconductive layer 104, and the cable shielding layer 105 are sequentially exposed from the front end side X1 of the axis X.

[0056] The cable conductor 101 is formed by stranding, for example, a plurality of wire rods. The inner semi-conductive layer 102 and the outer semi-conductive layer 104 of the cable are provided to alleviate the concentration of the electric field, and are formed, for example, by extrusion molding a polymer-based material containing conductive powders such as carbon and having conductivity. The outer semi-conductive layer 104 of the cable is electrically connected to the cable shielding layer 105 and contacts the third semi-conductive portion 213 as shown in Figure 1 . Thus, the third semi-conductive portion 213 is grounded via the outer semi-conductive layer 104 of the cable and the cable shielding layer 105. The cable insulator 103 and the cable sheath 106 are formed, for example, by extrusion molding an insulating material. The cable shielding layer 105 is composed of, for example, a wire wound around the outer semi-conductive layer 104 of the cable and is grounded during use.

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

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

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

[0060] (Functions and effects of the embodiment)

[0061] In the cable connection device 1 of this embodiment, the base end position of the pipe member 22 is located on the front end side X1 with respect to the mounting member 23. Thus, it is possible to prevent a portion sandwiched between the pipe member 22 and the mounting member 23 in the radial direction from being formed in the insulating pipe 21, and therefore it is possible to suppress the generation of stress in the insulating pipe 21 due to the difference in the linear expansion coefficients of the insulating pipe 21 and the pipe member 22 and the insulating pipe 21 and the mounting member 23. Further, the first semi-conductive portion 211 has a portion facing the second semi-conductive portion 212 in the radial direction. Therefore, for example, it is possible to suppress the approach of the end portion on the base end side X2 of the first semi-conductive portion 211 having a relatively small radius of curvature and the end portion on the front end side X1 of the second semi-conductive portion 212. As a result, it is possible to suppress the concentration of the electric field in the portion between the first semi-conductive portion 211 and the second semi-conductive portion 212 in the insulating pipe 21.

[0062] In addition, the length L1 between the pipe member 22 and the mounting member 23 in the axial direction X is greater than the length L2 between the pipe member 22 and the mounting member 23 in the radial direction. In this way, by separating the pipe member 22 and the mounting member 23 relatively greatly in the axial direction X, it is possible to further suppress the generation of stress in the insulating pipe 21 due to the difference in the linear expansion coefficients of the insulating pipe 21 and the pipe member 22 and the insulating pipe 21 and the mounting member 23.

[0063] In addition, the more the plurality of valley portions 210b to 210d are closer to the front end side X1, the more they are formed on the inner peripheral side, and the base end position of the pipe member 22 is located on the front end side X1 with respect to the valley portion (i.e., the large-diameter valley portion 210b) located on the outermost peripheral side among the valley portions 210b to 210d. Therefore, it is possible to suppress the impairment of the strengthening function of the pipe member 22 on the insulating pipe 21.

[0064] In addition, the base end position of the pipe member 22 is located on the base end side X2 with respect to the axial center position C of the portion of the insulating pipe 21 that is closer to the front end side X1 than the mounting member 23. Therefore, it is possible to suppress the impairment of the strengthening function of the pipe member 22 on the insulating pipe 21.

[0065] As described above, according to this embodiment, it is possible to provide a power cable connection device that can suppress the generation of stress in the insulating pipe and suppress the electric field concentration in the insulating pipe.

[0066] (Summary of the embodiment)

[0067] Next, the technical idea grasped from the above-described embodiment will be described by referring to the reference numerals in the embodiment. However, the symbols and the like in the following description do not limit the components in the claims to the components specifically shown in the embodiment.

[0068] [1] A power cable connection device 1 includes an insulating pipe 21 into which a power cable 10 is inserted inside, a pipe member 22 disposed inside the insulating pipe 21 and surrounding the power cable 10, and a mounting member 23. The mounting member 23 is disposed on the outer peripheral side with respect to the pipe member 22 and is partially buried in the insulating pipe 21 so that a mounting surface 233 for mounting to other members is exposed from the insulating pipe 21; the insulating pipe 21 has an insulator 210, a first semiconductive portion 211 provided between the insulator 210 and the pipe member 22, and a second semiconductive portion 212 provided between the insulator 210 and the mounting member 23; when the side of the insulating pipe 21 into which the cable 10 is inserted is taken as the base end side X2 and the opposite side is taken as the front end side X1, the base end position of the pipe member 22 is located on the front end side X1 with respect to the mounting member 23; the first semiconductive portion 211 has a portion that faces the second semiconductive portion 212 in the radial direction.

[0069] [2] The power cable connection device 1 according to [1], wherein the length L1 between the pipe member 22 and the mounting member 23 in the axial direction X is larger than the length L1 between the pipe member 22 and the mounting member 23 in the radial direction.

[0070] [3]The power cable connection device 1 according to [1] or [2], wherein, on the outer peripheral portion of the insulator 210, a plurality of peak portions 210a and valley portions 210b to 210d are alternately formed in the axial direction X, and the plurality of valley portions 210b to 210d are formed more on the inner peripheral side as they are closer to the front end side X1, and the base end position of the pipe member 22 is located on the front end side X1 with respect to the valley portion 210b which is the outermost peripheral side among the valley portions 210b to 210d.

[0071] [4]The power cable connection device 1 according to any one of [1] to [3], wherein the base end position of the pipe member 22 is located on the base end side X2 with respect to the axial center position C of the portion of the insulating pipe 21 that is closer to the front end side X1 than the mounting member 23.

[0072] (Supplementary Note)

[0073] The embodiments of the present invention have been described above, but the above embodiments do not limit the invention described in the claims. In addition, it should be noted that not all combinations of the features described in the embodiments are necessarily means for solving the problems of the invention. In addition, the present invention can be implemented with appropriate modifications without departing from its gist.

Claims

1. A power cable connection device, comprising: an insulating tube into which a power cable is inserted inside; a tube member disposed inside the insulating tube and surrounding the power cable, and a mounting member disposed on the outer peripheral side of the tube member and partially buried in the insulating tube so that a mounting surface for mounting on other members is exposed from the insulating tube; The insulating tube has: an insulator, a first semiconductive portion provided between the insulator and the tube member, and a second semiconductive portion provided between the insulator and the mounting member; When the side of the insulating tube into which the power cable is inserted is taken as the proximal end side and the opposite side is taken as the distal end side, the proximal end position of the tube member is located on the distal end side of the mounting member. The first semiconductive portion has a portion that is radially opposed to the second semiconductive portion.

2. The power cable connection device according to claim 1, wherein The length between the tube member and the mounting member in the axial direction is larger than the length between the tube member and the mounting member in the radial direction.

3. The power cable connection device according to claim 1 or 2, wherein, The outer peripheral portion of the insulator has a plurality of peaks and valleys alternately formed in the axial direction. The more the plurality of valleys are on the distal end side, the more they are formed on the inner peripheral side. The proximal end position of the tube member is located on the distal end side of the outermost peripheral valley among the valleys.

4. The power cable connection device according to claim 1 or 2, wherein, The proximal end position of the tube member is located on the proximal end side of the axial center position of the portion of the insulating tube on the distal end side of the mounting member.

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