Oil sealing member for OF cable, OF cable with oil sealing member, and end treatment method for OF cable

Abstract

To provide an OF cable oil sealing member capable of preventing leakage of oil from an OF cable by sealing an end part of the OF cable, which can perform a sealing operation in a short time without a special skill and can be reused without fire and a special device, and provide an end processing method of the OF cable using the sealing member.SOLUTION: An OF cable oil sealing member 1 is for preventing drain of an insulation oil existed inside of an OF cable by covering and sealing a cut end part of an OF cable C, and comprises: a cylindrical body 11 having an inner diameter larger than an outer diameter of the OF cable C, and in which one end opens; and an annular sealing bag body 12 which is arranged on an inner peripheral surface of the cylindrical body 11 and can be expanded by filling a fluid. With the expansion of the sealing bag body 12 by the filling of the fluid, the end part of the OF cable C can be sealed, and with the shrinkage of the sealing bag body 12 by an exhaust of the fluid, the oil sealing member 1 can be fetched out from the OF cable C.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an oil seal for an oil-filled cable, an oil-filled cable with an oil seal, and an end treatment method for an oil-filled cable. [Background technology]

[0002] Oil-filled (OF) cables are used as power cables. These OF cables are usually made by wrapping a conductor such as a copper wire with an oil passage near the center axis in insulating paper, and then immersing it in pressure-regulated insulating oil to ensure insulation that can withstand high voltages.

[0003] Because OF cables contain a large amount of insulating oil, when installing or removing them, it is necessary to cut long lengths of OF cables laid underground before transporting or storing them. When an OF cable has cut ends, the insulating oil present inside often leaks outward from the ends. For this reason, it is common for the cut ends of OF cables to be sealed before being removed.

[0004] For example, Patent Document 1 proposes a method in which the plastic sheath on the outer surface of the end of an OF cable is stripped away to expose the aluminum sheath, any irregularities on the surface of the aluminum sheath are filled in with solder, and then a portion of the aluminum sheath at the tip is also stripped away, and the space between the cable core and the aluminum sheath is sealed with a cap at that point, and the OF cable is inserted into the opening of a steel pipe with one end open, a ring spacer is provided between the vicinity of the opening of the steel pipe and the aluminum sheath to make contact, and the space is then soldered to form an airtight seal.

[0005] Patent Document 2 also proposes a method in which the plastic sheath on the outer surface of the end of an OF cable is stripped away to expose the metal sheath, synthetic resin tape is wrapped around the irregularities on the surface of the metal sheath, the end is inserted through the opening of a metal cylindrical body with one end open, the cylindrical body is placed over the OF cable, and then a compressive force of 5 to 10 tons is applied to the outer periphery of the side of the cylindrical body using a special device to compress and integrate the OF cable and the cylindrical body, thereby sealing them tightly. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 1-99427 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-343864 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the end treatment of the OF cable in Patent Document 1 requires special skills of a plumber, takes a lot of time, requires handling of fire at the installation site, and the notification process is cumbersome. Furthermore, the end treatment of the OF cable in Patent Document 1 is integrated with the OF cable by plumber, so the sealing member cannot be reused.

[0008] Furthermore, the end treatment of oil-filled cables in Patent Document 2 does not require special skills for installation, but handling fire requires complicated notification procedures, and the cylindrical body is compressed under high pressure, which again precludes reuse of the sealing material. Furthermore, the end treatment of oil-filled cables in Patent Document 2 requires specialized equipment for compression. Furthermore, while the end treatment of oil-filled cables in Patent Document 2 reduces work time to a certain extent, there is still room for improvement in terms of increasing efficiency and further reducing work time. Additionally, the end treatment of oil-filled cables in both Patent Documents 1 and 2 requires, in addition to the process of cutting the oil-filled cable, a process of stripping off the outermost layer (anticorrosion layer) of the oil-filled cable to expose the metal sheath layer, which creates the problem of cumbersome work.

[0009] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide an oil sealing member for OF cables that does not require special skills, can be sealed in a short time, is reusable, does not require fire or special equipment, and can seal the end of an OF cable to effectively prevent oil leakage from the OF cable, an OF cable with an oil sealing member, and an end processing method for an OF cable using the sealing member. [Means for solving the problem]

[0010]

[0006] As a result of extensive research into achieving the above-mentioned object, the present inventors have discovered an oil sealing element for an oil-filled cable that is placed over the cut end of an oil-filled cable to seal it and prevent leakage of insulating oil present inside the oil-filled cable. The oil sealing element comprises a cylindrical body having an inner diameter larger than the outer diameter of the oil-filled cable and one of its ends being open, and an annular sealing material that is disposed on the inner circumferential surface of the cylindrical body and is expandable when filled with a fluid. The oil sealing element seals the end of the oil-filled cable by expansion of the sealing material when filled with fluid, and can be removed from the oil-filled cable by contraction of the sealing material when the fluid is discharged. This discovery has led to the completion of the present invention.

[0011] That is, the gist and configuration of the present invention are as follows. (1) An oil sealing member for an oil-filled cable that covers and seals the cut end of an oil-filled cable to prevent the insulating oil present inside the oil-filled cable from leaking out, The oil sealing member is a cylindrical body having an inner diameter larger than the outer diameter of the OF cable and at least one end of which is open; an annular sealing material disposed on the inner circumferential surface of the cylindrical body and expandable by filling with a fluid; Equipped with An oil sealing element for an OF cable, characterized in that the end of the OF cable can be sealed by the expansion of the sealing material when a fluid is filled in, and the oil sealing element can be removed from the OF cable by the contraction of the sealing material when the fluid is discharged. (2) The oil sealing member for an oil-filled cable according to (1) above, wherein the sealing material is a sealing bag. (3) An oil sealing member for an OF cable as described in (1) or (2) above, wherein the cylindrical body has a fastening means at a position closer to the opening end than the position where the sealing bag body is disposed and capable of pressing and fixing the outer surface of the OF cable at multiple different positions in the circumferential direction. (4) An oil sealing member for an OF cable as described in claim 1, 2 or 3, wherein the tubular body further comprises an additional sealing bag that is arranged on the inner surface facing the end of the OF cable and that can be expanded by filling with a fluid. (5) The oil sealing member for an oil-filled cable according to any one of (1) to (4) above, wherein the cylindrical body has an inner surface shape corresponding to the expanded shape of the sealing pouch. (6) An oil sealing member for an oil-filled cable according to any one of (1) to (5) above, wherein the cylindrical body is arranged to extend from the open end toward the inside and is provided with a supply / discharge valve for supplying and discharging fluid to the sealing material. (7) The oil sealing member for an oil-filled cable according to (1) above, wherein the sealing material is a tubular membrane body, and the fluid is filled in a space formed by the tubular membrane body and the inner surface of the tubular body. (8) The cylindrical body is a cylindrical body having both ends open and extending portions extending outward from the two open ends along the outer periphery of the cylindrical body; a closing flange that closes one open end of the double-open cylindrical body and clamps one end of the cylindrical membrane body together with the extending portion of the double-open cylindrical body; The oil sealing member for an oil-filled cable according to (7) above, further comprising: a side flange that holds the other end of the tubular membrane body together with the other extension portion of the double-opened tubular body. (9) The oil sealing member for an oil-filled cable according to (8) above, wherein the side flange is in the shape of an annular plate and has an anti-slip mechanism for the oil-filled cable on the inner hole side. (10) An oil sealing member for an OF cable as described in (8) or (9) above, wherein the closing flange is arranged to penetrate in the thickness direction thereof and is provided with an oil discharge valve for discharging insulating oil discharged from the inside of the OF cable from the tubular body. (11) The oil sealing component for an oil-filled cable according to any one of (7) to (10) above, wherein the fluid is filled under pressure. (12) The oil sealing member for an oil-filled cable according to any one of (7) to (11) above, wherein the tubular film body is made of an elastic material. (13) The oil sealing member for an oil-filled cable according to any one of (7) to (12) above, wherein the cylindrical membrane has a thickness at both ends greater than that at an intermediate portion. (14) An oil sealing member for an oil-filled cable according to any one of (1) to (13) above, wherein the cylindrical body is arranged to penetrate in its thickness direction and is provided with a supply / discharge valve for supplying and discharging fluid to the sealing material. (15) The oil sealing member for an oil-filled cable according to (14) above, wherein the cylindrical body has a recess on its outer surface, and the supply / discharge valve is housed in the recess. (16) The oil sealing member for an oil-filled cable according to any one of (1) to (15) above, wherein the cylindrical body has a handle on its outer surface. (17) An oil-filled cable with an oil sealant, the end of which is covered and sealed with the oil sealant according to any one of (1) to (16) above. (18) A method for processing an end of an OF cable, comprising covering a cut end of the OF cable with the oil sealing member described in any one of (1) to (16) above, and then filling the sealing material with a fluid to expand the sealing material, thereby sealing the end of the OF cable. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide an oil sealing member for OF cables that does not require special skills, can be sealed in a short time, is reusable, and can seal the end of an OF cable without requiring fire or special equipment to prevent oil leakage from the OF cable, as well as a method for processing the end of an OF cable using the sealing member. [Brief explanation of the drawings]

[0013] [Figure 1] 1A and 1B are cross-sectional schematic views of an oil sealing member for an oil-filled cable according to a first embodiment of the present invention, in which FIG. 1A shows a state in which the sealing pouch is contracted, and FIG. 1B shows a state in which the sealing pouch is expanded. [Figure 2] 4 is a cross-sectional schematic view of an oil sealing member for an oil-filled cable according to a second embodiment of the present invention, showing the sealing pouch in an expanded state. FIG. [Figure 3]A schematic cross-sectional view of an oil seal member for an OF cable according to a third embodiment of the present invention, showing the state where the sealing bag body is inflated. [Figure 4] A schematic cross-sectional view of an oil seal member for an OF cable according to a fourth embodiment of the present invention, showing the state where the sealing bag body is inflated. [Figure 5] A schematic cross-sectional view of an oil seal member for an OF cable according to a fifth embodiment of the present invention, showing the state where the sealing bag body is inflated. [Figure 6] A schematic cross-sectional view of an oil seal member for an OF cable according to a sixth embodiment of the present invention, showing the state where the sealing bag body is inflated. [Figure 7] A schematic cross-sectional view of an oil seal member for an OF cable according to a seventh embodiment of the present invention, where (a) shows the state where the cylindrical film body is contracted and (b) shows the state where the cylindrical film body is inflated. [Figure 8] A schematic view of an oil seal member for an OF cable according to a seventh embodiment of the present invention, where (a) is a plan schematic view and (b) is a front schematic view.

Embodiments for Carrying Out the Invention

[0014] Hereinafter, various embodiments of an oil seal member for an OF cable according to the present invention will be described in detail with reference to the drawings, but the present invention is not limited to only the following embodiments.

[0015] <Oil seal member for OF cable> The sealing member for an OF cable according to the present invention is an oil seal member for an OF cable that covers and seals the cut end of the OF cable to prevent the insulating oil existing inside the OF cable from flowing out. The oil seal member has an inner diameter larger than the outer diameter of the OF cable, and includes a cylindrical body having at least one open end at both ends, and an annular sealing material disposed on the inner peripheral surface of the cylindrical body and capable of expanding by filling with a fluid. By the expansion of the sealing material accompanying the filling of the fluid, the end of the OF cable can be sealed, and by the contraction of the sealing material accompanying the discharge of the fluid, the oil seal member can be removed from the OF cable.

[0016] First, first to sixth embodiments in which a sealing bag is used as the sealing material will be described.

[0017] (First embodiment) 1(a) and (b) show the oil sealing member for an oil-filled cable according to the first embodiment, with (a) showing the sealing pouch in a contracted state and (b) showing the sealing pouch in an expanded state. Note that these figures show an oil-filled cable C to be sealed using the oil sealing member for an oil-filled cable, but the oil-filled cable C does not constitute the oil sealing member for an oil-filled cable according to the present invention.

[0018] The oil sealing member 1 for an OF cable according to the first embodiment is used to cover and seal the cut end of an OF cable C to prevent the insulating oil present inside the OF cable C from leaking out, and is mainly composed of a cylindrical body 11 and a sealing bag body 12.

[0019] [Cylindrical body] The cylindrical body 11 has an inner diameter larger than the outer diameter of the OF cable C, and is shaped so that one end is open (open end 111) and the other end is closed (closed end 112). This cylindrical body 11 functions as a lid (cap) for inserting and accommodating the end of the OF cable C and for closing the open end after cutting the OF cable C. The cylindrical body 11 may also be provided with an oil drain section (not shown; one example is the oil discharge valve 24 of the OF cable sealing member according to the seventh embodiment described below). For example, the oil drain section is positioned closer to the closed end 112 than the position of the sealing bag body 12, penetrating the cylindrical body 11 in the plate thickness direction, and can be provided on the outside with a valve or cap (a pressure-resistant one such as a screw-type one) for plugging. The oil drain section is normally closed, but by opening it, insulating oil that has leaked out of the OF cable C can be appropriately discharged outside the cylindrical body 11 while the oil sealing member 1 is attached to the OF cable C.

[0020] The material of the cylindrical body 11 is not particularly limited as long as it is strong enough to withstand the pressure when the insulating oil present in the OF cable C leaks (blows out) from the end of the OF cable C and is not destroyed by the weight of the OF cable C, and can be, for example, metals such as iron, copper, aluminum, titanium, or alloys of these, or reinforced plastics such as fiber reinforced plastic (FRP) or carbon fiber reinforced plastic (CFRP).

[0021] The shape of the tubular body 11 is not particularly limited except that one end is open, and examples include a cylindrical shape, an elliptical cylindrical shape, a polygonal cylindrical shape (triangular cylindrical shape, square cylindrical shape, etc.), etc. However, since the cross section of the OF cable C is usually circular, it is preferable to make it cylindrical in order to match the shape of the OF cable C and to prevent external forces from acting only at specific points on the outer surface of the OF cable C, so that they act uniformly.

[0022] When the tubular body 11 is a cylinder, the inner diameter of the tubular body 11 is larger than the outer diameter of the OF cable C, and it is only necessary that the end of the OF cable C can be inserted into the tubular body, and there are no other limitations on the configuration, but it is preferable that the inner diameter is, for example, 8 to 20 cm (φ80 to 200 mm). If the inner diameter of the tubular body 11 is selected from the range of 8 to 20 cm, it can be used for almost all OF cables.

[0023] While it would be ideal if one oil sealant for oil-filled cables could accommodate all oil-filled cable diameters, if this were technically difficult and operationally inefficient, it would be possible to create three variations of the product based on the diameters that could be accommodated, such as for φ60mm to φ90mm, φ90mm to φ120mm, and φ120mm to φ150mm. Each variation of the oil sealant for oil-filled cables could have a mechanism that allows the hole diameter in the side flange to be adjusted like a camera shutter, allowing the user to set the optimal diameter for use. Specifically, for example, when using a cap for cables with a diameter of φ60mm to φ90mm, the hole in the side flange could be a maximum of φ100mm, with the diameter able to be reduced to φ70mm.

[0024] [Sealed bag] The sealing bag body 12 is arranged on the inner surface of the cylindrical body 11, and has an annular shape that can expand when filled with fluid and contracts when the fluid is discharged, allowing the oil sealing member 1 to be removed from the OF cable C.

[0025] The oil sealing member 1 for OF cable of this embodiment is characterized in that it is possible to seal the end of the OF cable C by the expansion of the sealing bag body 12 as the fluid is filled in, and that it is possible to remove the oil sealing member 1 from the OF cable C by the contraction of the sealing bag body 12 as the fluid is discharged.

[0026] According to such an oil sealing member for an OF cable 1, the sealing pouch 12 suppresses leakage of insulating oil from the OF cable C. Simply by introducing and filling the sealing pouch 12 with a fluid from the outside and expanding it, leakage of insulating oil from the oil sealing member for an OF cable 1 can be prevented. Therefore, such an oil sealing member for an OF cable 1 does not require special skills, can be worked on in a short time, and does not require fire or special equipment.

[0027] Here, "fluid" means a liquid or a gas. The liquid is not particularly limited, but may be, for example, water. For example, when using this oil sealing member 1 for an oil-filled cable when removing an oil-filled cable C, filtered river water or seawater from the vicinity of the removal site may be used. The gas is not particularly limited, but may be, for example, air or nitrogen.

[0028] The sealing pouch 12 expands by filling the interior with such a fluid. The expanded sealing pouch 12 then seals the gap between the OF cable C and the inner diameter of the tubular body 11, and expands to be tightly attached to and integrated with the outer surface of the cable C (changing from FIG. 1(a) to FIG. 1(b)). This expansion prevents the insulating oil from leaking from the OF cable C, and by fixing and integrating the tubular body 11 to the end of the OF cable C, it is possible to prevent the OF cable oil sealing member 1 from separating from the end of the OF cable C.

[0029] On the other hand, the sealing bag 12 contracts as the fluid is discharged from inside it. This contraction (changing from FIG. 1(b) to FIG. 1(a)) creates a gap between the OF cable C and the oil sealing member 1, making it possible to separate and remove the oil sealing member 1 that was integrated with the OF cable C from the OF cable C.

[0030] The material of the sealing bag body 12 is not particularly limited as long as it can be expanded by filling it with gas, and examples thereof include rubber materials.

[0031] The shape of the sealing bag 12 is not particularly limited, other than being a ring-shaped shape that extends continuously around the entire inner circumference of the cylindrical body, and examples include a circular ring, an elliptical ring, and a polygonal ring (triangular ring, square ring, etc.). However, since the cross section of the OF cable C is usually circular, it is preferable to make it a circular ring so that it matches the outer shape of the OF cable C and so that the force applied to the sealing bag 12 by expansion acts uniformly around the entire circumference rather than acting locally at a specific point on the outer surface of the OF cable C.

[0032] When the sealing bag 12 is annular or cylindrical, the inner diameter of the sealing bag 12 (the hollow portion in the center of the ring) is not particularly limited, but is preferably smaller than the outer diameter of the OF cable C when the sealing bag 12 is expanded. By making the sealing bag 12 smaller than the outer diameter of the OF cable C when expanded, pressure can be applied from the sealing bag 12 to the OF cable C, improving adhesion between them and more reliably suppressing leakage of insulating oil from the OF cable C, and more reliably preventing separation of the OF cable oil sealing member 1 from the end of the OF cable C. Specifically, the difference between the inner diameter of the sealing bag 12 when expanded and the outer diameter of the OF cable C to be inserted is preferably 1 to 3 cm, more preferably 1 to 4 cm, and even more preferably 1 to 7 cm.

[0033] Furthermore, the outer diameter of the sealing bag body 12 (the outer peripheral portion of the ring in plan view) is not particularly limited, but is preferably larger than the inner diameter of the tubular body 11 when the sealing bag body 12 is expanded. By making the sealing bag body 12 larger than the inner diameter of the tubular body 11 when the sealing bag body 12 is expanded, pressure can be applied from the sealing bag body 12 to the OF cable C, improving adhesion between the two and more reliably suppressing leakage of insulating oil from the OF cable C. Also, it is possible to more reliably prevent the OF cable oil sealing member 1 from separating from the end of the OF cable C. Specifically, the difference between the outer diameter of the sealing bag body 12 when expanded and the inner diameter of the tubular body 11 is preferably 1 to 3 cm, more preferably 1 to 4 cm, and even more preferably 1 to 7 cm.

[0034] In addition, by providing such a sealed bag body 12 with, for example, a supply / discharge valve 13 (described in detail later), it can be expanded by supplying a fluid such as gas or liquid using, for example, a general gas compressor or a water pump. In other words, even if the sealed bag body 12 is used, no special equipment is required.

[0035] [Supply / Exhaust Valve 13] The cylindrical body 11 is provided with a supply / discharge valve 13. This supply / discharge valve 13 is arranged to penetrate the cylindrical body 11 in the plate thickness direction, and supplies and discharges a fluid to and from the sealed bag body 12, which will be described later. The supply / discharge valve 13 is connected to the sealed bag body 12 at a sealed bag body connection port 131 in a state in which the fluid can be supplied to and discharged from the sealed bag body 12. The supply / discharge valve 13 is also provided with an external supply / discharge port 132 exposed to the outside of the cylindrical body 11 at the other end of the supply / discharge valve 13. This external supply / discharge port 132 can be connected to, for example, a gas compressor to send a fluid from the outside to the sealed bag body 12, causing the sealed bag body 12 to expand.

[0036] As described above, the sealing bag 12 expands to close the gap between the outer surface of the OF cable C and the inner surface of the cylindrical body 11, thereby preventing leakage of insulating oil from the OF cable C. By providing the supply / discharge valve 13 as a means for expanding the sealing bag 12, the expansion of the sealing bag 12 can be performed more easily.

[0037] The supply / discharge valve 13 may be a valve that seals normal gases and liquids and can discharge them as needed.

[0038] With the above-described oil-filled cable oil sealing member 1, the oil-filled cable C can be sealed to prevent leakage of insulating oil simply by covering the end of the oil-filled cable C with the oil-filled cable oil sealing member 1 and then filling the sealing pouch 12 with a fluid via the supply / discharge valve 13 using a pump or the like. By using the oil-filled cable oil sealing member 1 in this manner, the end of the oil-filled cable can be sealed without requiring special skills, a short work period, or the use of fire or special equipment. Furthermore, when the above-described oil-filled cable oil sealing member 1 is used, the oil-filled cable oil sealing member 1 does not undergo irreversible deformation or adhesion. Furthermore, by contracting the sealing pouch 12 as the fluid is discharged, the oil-filled cable oil sealing member 1 can be easily removed from the oil-filled cable C without damaging the cylindrical body 11, allowing the oil-filled cable oil sealing member 1 to be reused multiple times.

[0039] (Second embodiment) Fig. 2 shows an oil sealing member for an oil-filled cable according to a second embodiment of the present invention, with the sealing pouch inflated. Note that, hereinafter, explanations and reference numerals for parts that overlap with those of the oil sealing member for an oil-filled cable of the first embodiment will be omitted. Also, in Fig. 2, the reference numerals for each part are all followed by "A" or "a," but the same numerals in Figs. 1 and 2 indicate the same parts.

[0040] In the OF cable sealing member 1A shown in Fig. 2, the cylindrical body 11a is provided with fastening means 14. The fastening means 14 are preferably provided at positions on the cylindrical body 11a closer to the open end 111a than the position where the sealing pouch body 12a is disposed, and at multiple different positions on the outer surface of the OF cable C at equal intervals in the circumferential direction. Specifically, two equal-interval positions (180° intervals) are preferred, and three or more positions are more preferred. In Fig. 2, the fastening means are means that can press and fix the cable C at four equal-interval positions (90° intervals) or three equal-interval positions (120° intervals) corresponding to the outer periphery of the cable C, and examples of such means include bolts and screws.

[0041] As described above, the expansion of the sealing pouch 12a can more reliably prevent the oil sealing member for an oil-filled cable 1A from separating from the end of the oil-filled cable C. However, in order to more reliably prevent the oil sealing member for an oil-filled cable 1A from separating, it is preferable that the oil sealing member for an oil-filled cable 1A is provided with a fastening means 14. This allows the oil sealing member for an oil-filled cable 1a and the oil-filled cable C to be fixed together, and can more reliably prevent the oil sealing member for an oil-filled cable 1A from separating from the end of the oil-filled cable C.

[0042] The fastening means 14 may be one that can be fixed with a general fastening tool such as a Phillips head screwdriver, a flat head screwdriver, a hex wrench, etc. In other words, even if the fastening means 14 is used, no special tool is required.

[0043] (Third embodiment) Fig. 3 shows an oil sealing member for an oil-filled cable according to a third embodiment of the present invention, with the sealing pouch inflated. Note that, hereinafter, explanations and reference numerals for parts that overlap with those of the oil sealing member for an oil-filled cable of the first embodiment will be omitted. Also, in Fig. 3, the reference numerals for each part are all followed by "B" or "b," but the same numerals in Figs. 1 and 3 indicate the same parts.

[0044] 3, the cylindrical body 11b has a recess 113 on its outer surface, and the supply and discharge valve 13b is housed in the recess 113. If the supply and discharge valve 13b protruded from the outer surface of the cylindrical body 11b, the supply and discharge valve 13b might get caught on a foreign object during transportation of the OF cable C, which could cause the oil sealing member 1B for the OF cable to separate from the end of the OF cable C. However, by housing the supply and discharge valve 13b in the recess 113, the supply and discharge valve 13b does not protrude from the outer surface of the cylindrical body 11b, reducing the possibility of foreign object getting caught on the supply and discharge valve 13b. As a result, the oil sealing member 1B for the OF cable can be more reliably prevented from separating from the end of the OF cable C.

[0045] (Fourth embodiment) Fig. 4 shows an oil sealing member for an oil-filled cable according to a fourth embodiment of the present invention, with the sealing pouch inflated. Hereinafter, some of the explanations and reference numerals for parts that overlap with those of the oil sealing member for an oil-filled cable of the first embodiment will be omitted. In Fig. 4, the reference numerals for each part are all followed by the letter "C" or "c," but the same numerals used in Figs. 1 and 4 refer to the same parts. For convenience, the fastening means has been omitted from Fig. 4.

[0046] In the oil sealing member 1C for OF cable shown in Figure 4, the cylindrical body 11c is arranged to extend from the open end 111c toward the inside of the cylindrical body 11c and is provided with a supply / discharge valve 13c that supplies and discharges fluid to and from the sealing bag body 12c.

[0047] Like the oil sealing member 1B of the third embodiment, the oil sealing member 1C for an oil-filled cable of the fourth embodiment is intended to prevent the oil-filled cable C from falling out of the oil-filled cable oil sealing member 1C due to the supply / discharge valve 13c being caught on a foreign object. By arranging the supply / discharge valve 13c so that it extends from the open end 111c toward the inside of the cylindrical body 11c, the supply / discharge valve 13c extends in the same direction as the inner wall of the cylindrical body 11c and into the cylindrical body 11c. This prevents the supply / discharge valve 13c from being exposed on the outer surface of the cylindrical body 11c. This reduces the possibility of the supply / discharge valve 13c being caught on a foreign object, thereby more reliably preventing the oil sealing member 1C for an oil-filled cable from being separated from the end of the oil-filled cable C.

[0048] (Fifth embodiment) Fig. 5 shows an oil sealing member for an oil-filled cable according to a fifth embodiment of the present invention, with the sealing pouch inflated. Note that, hereinafter, explanations and some reference numerals for parts that overlap with those of the oil sealing member for an oil-filled cable of the first embodiment will be omitted. Note that, although the reference numerals for each part in Fig. 5 all have "D" or "d" suffixed, the same numerals in Fig. 1 and Fig. 5 indicate the same parts.

[0049] In the oil sealing member 1D for an oil-filled cable shown in FIG. 5, the cylindrical body 11d has an inner surface portion 114 having an inner surface shape corresponding to the expanded shape of the sealing pouch body 12d.

[0050] Specifically, when the sealing pouch 12d expands due to filling with a fluid, it has a diameter larger than the inner diameter of the cylindrical body 11d. In such a case, a recess is provided in the inner wall (inner surface portion 114) of the cylindrical body 11d so that the inner surface portion 114 of the cylindrical body 11d has an inner shape corresponding to the expanded shape, i.e., the sealing pouch 12d. By providing this inner surface portion 114, when the sealing pouch 12d expands, the outer surface portion of the sealing pouch 12d fills the recess 114, and as a result, it is possible to more reliably prevent the oil sealing member for an oil-filled cable 1D from separating from the end of the oil-filled cable C.

[0051] (Sixth embodiment) Fig. 6 shows an oil sealing member for an oil-filled cable according to a sixth embodiment of the present invention, with the sealing pouch inflated. Note that, hereinafter, explanations and some reference numerals that overlap with those of the oil sealing member for an oil-filled cable of the first embodiment will be omitted. Note that, although the reference numerals of each part in Fig. 6 all have an "E" added to their numerals, the same numerals in Fig. 1 and Fig. 6 indicate the same parts.

[0052] In the oil sealing member 1E for an oil-filled cable shown in FIG. 6, the end C of the oil-filled cable C E The container further includes an additional sealed bag 15 that is disposed on the inner surface facing the container and is inflatable by being filled with a fluid.

[0053] In such an oil sealing member for an OF cable 1E, in addition to the sealing bag 12e, an additional sealing bag 15 is arranged on the above-mentioned surface. By providing this additional sealing bag 15, the end C of the OF cable C can be E The additional sealing bag 15 can contact the end C of the OF cable C and seal a part or the whole of the end, thereby further suppressing the leakage of insulating oil. E It can be applied towards

[0054] In addition, the oil sealing member for oil-filled cables 1E is shown to be provided with four fastening means 14e. The expansion of the sealing bag body 12e sufficiently prevents the oil sealing member for oil-filled cables C from being pushed out of the oil sealing member for oil-filled cables 1E due to the expansion of the sealing bag body 15, but the provision of the fastening means 14e makes it possible to more reliably prevent such pushing-out of the oil-filled cables C.

[0055] Next, a seventh embodiment will be described, in which a sealing film body is used as the sealing material.

[0056] (Seventh embodiment) 7(a) and (b) show the oil sealing member for an oil-filled cable according to the seventh embodiment, where (a) shows the sealing film body in a contracted state and (b) shows the sealing film body in an expanded state. In these figures, the oil-filled cable C to be sealed using the oil sealing member for an oil-filled cable is shown. H Although the OF cable C H does not constitute the oil sealing member for an oil-filled cable according to the present invention. In addition, unlike Figures 1 to 6, Figure 7 shows an oil-filled cable having a spiral surface, but the surface shape of the oil-filled cable to be sealed is not limited in any of the embodiments of the oil sealing member for an oil-filled cable.

[0057] The oil sealing member 1F for an oil-filled cable according to the seventh embodiment is placed on the cut end of the oil-filled cable C to seal it. H In this oil sealing member 1F for an oil-filled cable, the sealing material is a cylindrical membrane body 17, and a fluid is filled in a space 18 formed by this cylindrical membrane body 17 and the inner peripheral surface of the cylindrical body 11f (a cylindrical body 19 with both ends open).

[0058] [Cylindrical body] The cylindrical body 11f is mainly composed of a cylindrical body 19 with both ends open, a closing flange 20, and a side flange 21, and is used for the OF cable C. H The inner diameter is larger than the outer diameter of the

[0059] The double-open cylindrical body 19 is open at both ends and has extensions 193 and 194 that extend outward from the two open ends 191 and 192 along the outer periphery of the double-open cylindrical body 19.

[0060] The material of the cylindrical body 11f (i.e., the cylindrical body 19 with both ends open, the closing flange 20, and the side flange 21) is OF cable C. H The insulating oil present in the OF cable C H It can withstand the pressure when the oil leaks (blows out) from the end of the OF cable C. H The material is not particularly limited as long as it has a strength that will not be broken by the weight of the object, and examples that can be used include metals such as iron, copper, aluminum, and titanium, or alloys of these, and reinforced plastics such as fiber reinforced plastics (FRP) and carbon fiber reinforced plastics (CFRP).

[0061] Although the shape of the tubular body 19 having both ends open is shown as a cylindrical shape in FIG. 7, the shape of the tubular body 19 having both ends open is not particularly limited to a cylindrical shape, and examples thereof include a cylindrical shape, an elliptical cylindrical shape, and a polygonal cylindrical shape (a triangular cylindrical shape, a square cylindrical shape, etc.). H Since the cross section of the OF cable is usually circular, H The OF cable C is designed to conform to the shape of the cable and to withstand external forces. H It is preferable that the shape of the pressure sensor be cylindrical in order to prevent the pressure sensor from acting only on specific points on the outer surface of the pressure sensor and to configure the pressure sensor to act uniformly.

[0062] When the cylindrical body 19 having both open ends is a cylinder, the inner diameter of the cylindrical body 19 having both open ends is H The outer diameter of the cylindrical body is larger than that of the OF cable C. H The inner diameter of the cylindrical body 11 is preferably 8 to 20 cm (φ80 to 200 mm), for example. If the inner diameter of the cylindrical body 11 is selected from the range of 8 to 20 cm, it can be used with almost all OF cables.

[0063] While it would be ideal if one oil sealant for oil-filled cables could accommodate all types of oil-filled cable diameters, if this were technically difficult and operationally inefficient, it would be possible to create three variations of the product based on the diameters that could be accommodated, such as for φ60mm to φ90mm, φ90mm to φ120mm, and φ120mm to φ150mm. Each variation of the oil sealant for oil-filled cables could then be equipped with a mechanism that allows the hole diameter in the side flange to be adjusted like a camera shutter, allowing the user to set the optimal diameter for use. Specifically, for example, when using a cap for cables with a diameter of φ60mm to φ90mm, the hole in the side flange could be a maximum of φ100mm, with the diameter able to be reduced to φ70mm.

[0064] The cylindrical body 11f (particularly the cylindrical body 19 with both ends open) is provided with a supply / discharge valve 195 that is disposed so as to penetrate the cylindrical body 11f in the thickness direction and that supplies and discharges fluid to the sealing material. Note that the supply / discharge valve 195 is not limited to being provided integrally with the cylindrical body 19 with both ends open as shown in Fig. 7, but can also be configured by combining the cylindrical body 19 with other parts. By providing the supply / discharge valve 195 in this manner, the sealing material can be repeatedly expanded and contracted in a reversible manner, and the oil sealing member for oil-filled cables 1F can be reused.

[0065] The closing flange 20 closes one open end 192 of the open-ended cylindrical body 19 and clamps one end 171 of the cylindrical membrane body together with an extension 193 of the open-ended cylindrical body 19 .

[0066] The shape, size, and thickness of the closing flange 20 are not particularly limited as long as it is capable of closing one open end 192 of the double-open cylinder 19 and clamping one end 171 of the tubular membrane together with the extended portion 193 of the double-open cylinder 19, but it is preferably plate-shaped, for example. It is preferable that the clamping of one end 171 of the tubular membrane 17 is carried out over the entire circumference of the open end 192 of the double-open cylinder 19. The clamping of one end 171 of the tubular membrane 17 is fixed with bolts 22.

[0067] By the way, OF cable C H The insulating oil discharged from the inside of the cylindrical body 11f, particularly the OF cable C H The oil may accumulate near the end of the oil-filled cable, and the oil sealing member 1F for the oil-filled cable may easily come off due to the pressure. H It is preferable to provide an oil discharge valve 24 for discharging the insulating oil discharged from the inside of the cylindrical body 11f from the cylindrical body 11f. This allows the insulating oil to be discharged from inside the cylindrical body 11f.

[0068] The side flange 21 clamps the other end 172 of the tubular membrane body 17 together with the other extension portion 194 of the double-open tubular body 19 .

[0069] The shape, size and thickness of the side flange 21 are such that it can clamp the other end 172 of the tubular membrane body 17 together with the extension part 194 of the double-open tubular body 191, and the OF cable C H There is no particular limitation as long as it is possible to pass the OF cable C through the inside of the cylindrical body 19 with both ends open. For example, H The membrane 17 preferably has an annular shape in plan view, an annular plate shape is preferable, and a circular annular plate shape is even more preferable, and has an inner hole for passing therethrough. The one end 172 of the tubular membrane 17 is preferably clamped over the entire circumference of the open end 191 of the open-ended tubular body 19. The one end 171 of the tubular membrane 17 is clamped and fixed by a bolt 23.

[0070] The side flange 21 is connected to the center of the OF cable C. H If there is an inner hole for passing the OF cable C, H OF cable C to prevent disconnection H In this way, the side flange 21 has an anti-slip mechanism (not shown), so that the OF cable C H This can more reliably prevent the wire from coming off.

[0071] The anti-slip mechanism is not particularly limited, but may be an OF cable C from the inner hole side. H A saw blade is provided facing the OF cable C. H As an anti-slip mechanism, an eyebolt or the like is used as a bolt for fixing the side flange 21, the other end 172 of the tubular membrane body 17, and the extension part 194 of the double-open tubular body 19, and the wire is passed through the ring, and the OF cable C is fixed. H and wrap it around the side flange 21 and OF cable C H Examples of measures include fixing the

[0072] OF cable C is attached to the center of the side flange 21. H When the cable has an inner hole for passing the cable therethrough, the shape of the inner hole is preferably circular in plan view from the viewpoint of passing the cable through.

[0073] In addition, the diameter d of the inner hole of the side flange 21 i OF cable C H Diameter d c (the outer diameter of the largest part of the outer shape in a cross section perpendicular to the length direction) and the inner diameter d of the cylindrical body 19 with both ends open t The diameter d of the inner hole of the side flange 21 is smaller than i is the inner diameter d of the cylindrical body 19 with both ends open t From this, the thickness t of the cylindrical membrane body 17 at the other end 172 side of the cylindrical membrane body 17 in a relaxed state is m It is preferable that the length is equal to or less than twice the length of the cylindrical membrane body 17. This makes it possible to press the cylindrical membrane body 17 and prevent the cylindrical membrane body 17 from contacting the OF cable C. H This can further effectively prevent the OF cable C from bulging outward and protruding from the gap between the OF cable C and the inner hole of the side flange 21. H Diameter d c and the diameter d of the inner hole of the side flange 21 i The difference between the thickness t and the thickness t of the cylindrical membrane 17 at the other end 172 side of the cylindrical membrane 17 in a relaxed state is m It is more preferable that the value is two times or less than that of the OF cable C. H The gap between the inner hole of the side flange 21 and the thickness t of the cylindrical membrane body 17 mThe cylindrical membrane body 17 is the OF cable C H In this way, it is possible to more reliably prevent the cylindrical membrane body 17 from expanding and protruding outward through the gap in the inner hole of the side flange 21. By preventing the cylindrical membrane body 17 from protruding outward in this way, the pressure from the cylindrical membrane body 17 is H Apply to OF cable C H In addition, the term "diameter" refers to the diameter of a circular shape in plan view, and refers to the diameter of a circumscribed circle in the case of a shape other than a circle in plan view.

[0074] [Cylindrical membrane] The cylindrical membrane body 17 is a cylindrical membrane body arranged on the inner peripheral surface of the cylindrical body 11f. One end 171 of the cylindrical membrane body 17 in the cylindrical height direction is sandwiched between an extension portion 193 of the double-opened cylindrical body and a closing flange 20. The other end 172 of the cylindrical membrane body 17 in the cylindrical height direction is sandwiched between an extension portion 194 of the double-opened cylindrical body and a side flange 21. This forms a closed space 18 between the double-opened cylindrical body 19 and the cylindrical membrane body 17. A fluid is introduced into this space 18 through a supply / discharge valve 195.

[0075] In the oil sealing member 1F for an OF-cable, the fluid is filled in a pressurized state. By filling the space 18 with the fluid in a pressurized state, the OF-cable C H Pressure is applied from the sealing film body 17 to the OF cable C H The fluid can be fixed more firmly. H If the above can be fixed, any fluid medium, whether gas, liquid, or the like, can be used.

[0076] In the oil sealing member for OF cable 1F, the cylindrical membrane body 17 is made of pressurized rubber. By using pressurized rubber as the cylindrical membrane body 17, the OF cable C H Pressure is applied from the sealing film body 17 to the OF cable C H The sealing film body 17 is made of an elastic material such as pressure-sensitive rubber, and has rubber elasticity and the like, so that the OF cable C can be fixed more firmly. HThere is no particular limitation as long as it can more firmly fix the

[0077] In the oil sealing member 1F for OF cable, the cylindrical membrane body 17 is configured so that the thickness of both ends (one end 171, the other end 172) is thicker than the thickness of the middle part. In this way, by configuring the thickness of both ends to be thicker than the thickness of the middle part of the cylindrical membrane body 17, the strength of both clamped ends and their vicinity is increased, and it is possible to prevent the cylindrical membrane body 17 from protruding from the side flange 21 on the other end 172 side due to the applied pressure of the fluid. In addition, by configuring the thickness of the middle part of the cylindrical membrane body 17 to be thinner than both ends, it is possible to prevent the cylindrical membrane body 17 from protruding from the side flange 21 on the other end 172 side due to the applied pressure of the fluid. H The oil sealing material 1F for OF cable is made of OF cable C. H The "middle part" refers to the middle part in the longitudinal direction (height direction of the cylinder).

[0078] 8A and 8B are schematic diagrams of an oil sealing member for an OF cable according to a seventh embodiment of the present invention, where (a) is a schematic plan view and (b) is a schematic front view. The oil sealing member for an OF cable 1F has a handle 25 on its outer surface to improve workability, as shown in FIGS. 8A and 8B. The specific shape and location of the handle are not limited to the shape of the handle 25 provided on the outer surface of the cylindrical body 19 with both ends open, as shown in FIG. 8. Handles may also be provided in the oil sealing members for an OF cable according to the first to sixth embodiments described above.

[0079] In the examples shown above, the cylindrical body is composed of a cylindrical body with openings at both ends, a closing flange, and a side flange, but the specific form of formation of the space is not particularly limited as long as the fluid is filled in the space formed by the cylindrical membrane body and the inner surface of the cylindrical body.

[0080] <OF cable with oil seal> The oil-sealing member of the above-described embodiment can be used as a new OF cable with an oil-sealing member by covering the end portion of the OF cable and sealing it (by expanding the sealing bag). According to such an OF cable with an oil-sealing member, for example, leakage of insulating oil can be suppressed during distribution or storage.

[0081] <Method for Processing End Portion of OF Cable> The method for processing the end portion of an OF cable according to an embodiment of the present invention is characterized in that, after covering the cut end portion of the OF cable with the oil-sealing member of the above-described embodiment, fluid is filled into the sealing bag to expand the sealing bag, thereby sealing the end portion of the OF cable.

[0082] As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and includes all aspects included in the concept and scope of claims of the present invention, and can be variously modified within the scope of the present invention.

Description of Reference Numerals

[0083] 1, 1A, 1B, 1C, 1D, 1E, 1F Oil-sealing members for OF cables 11, 11a, 11b, 11c, 11d, 11e, 11f Cylindrical bodies 111, 111a, 111c Open ends 112 Closed end 113 Concave portion 114 Inner surface portion of the cylindrical body 12, 12a, 12b, 12c, 12d, 12e Sealing bags 13, 13a, 13b, 13c, 13d, 13e Supply / discharge valves 131 Sealing bag connection port 132 External supply / discharge port 14, 14e Tightening means 15 Additional sealing bag 16 Supply / discharge valve 17 Cylindrical film body 171 One end 172 The other end 18 Space 19. Cylindrical body with openings at both ends 191,192 Open end 193,194 Extension 195 Intake and exhaust valve 20 Blind flange 21 Side flange 22, 23 volts 24 Oil drain valve 25 Toride C, C H OF cable C E OF cable end

Claims

1. An oil sealing member for an oil-filled cable that is placed over and sealed on a cut end of an oil-filled cable to prevent leakage of insulating oil present inside the oil-filled cable, The oil sealing member is a cylindrical body having an inner diameter larger than the outer diameter of the OF cable and at least one end of which is open; an annular sealing material disposed on the inner circumferential surface of the cylindrical body and expandable by filling with a fluid; Equipped with The oil sealing member can be removed from the oil-filled cable by contracting the sealing material as the fluid is discharged, and the oil sealing member can be removed from the oil-filled cable by expanding the sealing material as the fluid is filled. The oil sealing member for an oil-filled cable is characterized in that the sealing material extends in the axial direction of the oil-filled cable, and when the sealing material expands, the surface of the sealing material facing the outer surface of the oil-filled cable is tightly adhered to and integrated with the outer surface of the oil-filled cable while expanding in the axial direction of the oil-filled cable.

2. The oil sealing member for an oil-filled cable according to claim 1 , wherein the sealing material is a sealing bag.

3. 3. An oil sealing member for an oil-filled cable as described in claim 2, wherein the cylindrical body has a fastening means at a position closer to the opening end than the position of the sealing bag body and capable of pressing and fixing the outer surface of the oil-filled cable at a plurality of different positions in the circumferential direction.

4. 4. An oil sealing member for an oil-filled cable as described in claim 2 or 3, wherein the cylindrical body further comprises an additional sealing bag that is arranged on an inner surface facing the end of the oil-filled cable and that can be expanded by filling with a fluid.

5. 5. The oil sealing member for an oil-filled cable according to claim 2, wherein the cylindrical body has an inner surface shape corresponding to the expanded shape of the sealing bag.

6. The oil sealing member for an OF cable according to any one of claims 1 to 5, wherein the cylindrical body is arranged to extend from an open end toward the inside and is provided with a supply and discharge valve for supplying and discharging fluid to and from the sealing material.

7. An oil sealing member for an OF cable described in any one of claims 1 to 5, wherein the cylindrical body is arranged to penetrate in the thickness direction of the plate and is provided with a supply and discharge valve for supplying and discharging fluid to the sealing material.

8. 8. The oil sealing member for an oil-filled cable according to claim 7, wherein the cylindrical body has a recess on an outer surface thereof, and the supply / discharge valve is housed in the recess.

9. 2. The oil sealing member for an oil-filled cable according to claim 1, wherein the sealing material is a cylindrical membrane body, and the fluid is filled in a space formed by the cylindrical membrane body and the inner surface of the cylindrical body.

10. An oil sealing member for an OF cable as described in Claim 9, wherein the tubular membrane body is sandwiched between open ends located at both ends of the tubular body and two plate-like members.

11. An oil sealing member for an oil-filled cable that is placed over and sealed on the cut end of an oil-filled cable to prevent the insulating oil present inside the oil-filled cable from leaking out, The oil sealing member is a cylindrical body having an inner diameter larger than the outer diameter of the OF cable and at least one end of which is open; an annular sealing material disposed on the inner circumferential surface of the cylindrical body and expandable by filling with a fluid; Equipped with the sealing material is a cylindrical membrane body, and the fluid is filled in a space formed by the cylindrical membrane body and an inner circumferential surface of the cylindrical body; The oil sealing member can be removed from the oil-filled cable by contracting the sealing material as the fluid is discharged, and the oil sealing member can be removed from the oil-filled cable by expanding the sealing material as the fluid is filled. The cylindrical body is arranged to penetrate in the thickness direction of the body and is provided with a plurality of supply and discharge valves for supplying and discharging fluid to and from the sealing material.

12. The cylindrical body is The housing is composed of a cylindrical body having openings at both ends and the two plate-like members, namely, a closing flange and a side flange, the double-opened cylindrical body has both ends open and extending portions extending outward from the two open ends along the outer periphery of the double-opened cylindrical body, the closing flange closes one open end of the double-open cylindrical body, and clamps one end of the cylindrical membrane body together with the extending portion of the double-open cylindrical body, 11. The oil sealing member for an oil-filled cable according to claim 10, wherein the side flange, together with the other extension portion of the double-opened cylindrical body, clamps the other end of the cylindrical membrane body.

13. An oil sealing member for an OF cable as described in Claim 12, wherein the side flange is in the shape of a circular ring plate and has an anti-slip mechanism for the OF cable on the inner hole side.

14. An oil sealing member for an OF cable as described in claim 12 or 13, wherein the closing flange is arranged to penetrate in the thickness direction of the plate and is provided with an oil discharge valve for discharging insulating oil discharged from inside the OF cable from the tubular body.

15. An oil sealing member for an OF cable as described in any one of claims 9 to 14, wherein the fluid is filled under pressure.

16. An oil sealing member for an OF cable described in any one of claims 9 to 15, wherein the tubular membrane body is made of an elastic material.

17. An oil sealing member for an OF cable as described in any one of claims 9 to 16, wherein the cylindrical membrane body has a thickness at both ends that is thicker than the thickness at the middle portion.

18. An oil sealing member for an OF cable described in any one of claims 1 to 17, wherein the cylindrical body has a handle on its outer surface.

19. An OF cable with an oil sealing member, the end of which is covered and sealed with an oil sealing member described in any one of claims 1 to 18.

20. A method for processing the end of an OF cable, characterized in that an oil sealing member described in any one of claims 1 to 18 is placed over the cut end of the OF cable, and then the end of the OF cable is sealed by filling the sealing material with a fluid to expand the sealing material.

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