Plugging method for axial channeling leakage of insulating oil of oil-filled submarine cable

Abstract

The invention discloses an oil-filled submarine cable insulating oil axial channeling leakage blocking method. The method comprises the steps that permeation grooves are cut in the two sides of an insulating oil leakage point outside an armor layer through a grooving machine; a plugging device composed of a sleeve, a plugging sleeve, a guide sleeve, a strip-shaped felt and a flange is installed, the sleeve is used for plugging an outer insulating oil leakage point of the armor layer, and the plugging sleeve is used for constructing an outer sealing cavity of the armor layer at permeation grooves in the two sides of the outer insulating oil leakage point of the armor layer; the pipeline is connected with an air injection port, and the air is used for providing a space without insulating oil and seawater for the sealant; a high-permeability sealant and a low-permeability sealant are injected to construct a lead sheath outer sealing ring belt, the lead sheath outer sealing ring belt is used for blocking the insulating oil from leaking along a gap between the lead sheath and the armor layer, and compared with the prior art, the continuity of the oil-filled submarine cable body is not damaged, the problem of insulating oil leakage along the axial direction is thoroughly solved, and the service life of the oil-filled submarine cable is prolonged. The repair cost is reduced, the repair period is shortened, and foreign technical monopoly is broken through.

Description

Technical Field

[0001] The present invention relates to the field of oil-filled submarine cable sealing, and in particular to a method for plugging the leakage of oil-filled submarine cable insulation oil due to shaft displacement. Background Art

[0002] The insulating oil filled inside an oil-filled submarine cable (submarine cable) improves the insulation performance and cooling effect. Once the insulating oil leaks, it will not only affect the electrical insulation performance of the submarine cable, but also may cause marine environmental pollution.

[0003] Currently, there are two mature repair methods, namely connection repair and water isolation repair. However, both of these two technologies require destroying the continuity of the submarine cable body, with high repair costs, long repair cycles, and foreign technical assistance cannot be provided in a timely manner. These two technologies are completely controlled by foreign submarine cable manufacturers and are typical "neck-sticking" engineering technologies.

[0004] Aiming at the problem of insulating oil leakage caused by fatigue damage to the lead sheath and anticorrosion layer of the submarine cable, it is urgent to develop a plugging method that does not damage the continuity of the submarine cable body. This method uses the way of cutting penetration grooves on both sides of the insulating oil leakage point outside the armor layer, installing a plugging device, purging with air, and injecting sealants to construct a sealing ring band outside the lead sheath, so as to fundamentally solve the problem of shaft displacement leakage of insulating oil in the gap outside the lead sheath. Summary of the Invention

[0005] Therefore, the technical problems to be solved by the present invention are: how to cut penetration grooves on both sides of the insulating oil leakage point outside the armor layer, how to install the plugging device, how to drain the insulating oil and seawater in the sealing cavity outside the armor layer, and how to inject high-permeability sealant and low-permeability sealant to construct a sealing ring band outside the lead sheath.

[0006] The above technical problems are solved by the following technical solutions: The present invention provides a method for plugging the leakage of oil-filled submarine cable insulation oil due to shaft displacement, which includes using a grooving machine to cut penetration grooves on both sides of the insulating oil leakage point outside the armor layer; installing a plugging device composed of a sleeve, a plugging sleeve, a guide sleeve, strip-shaped felt, and a flange. The sleeve is used to plug the insulating oil leakage point outside the armor layer, and the plugging device is used to construct a sealing cavity outside the armor layer at the penetration grooves on both sides of the insulating oil leakage point outside the armor layer; connecting an air injection port pipeline, and the air is used to drain the insulating oil and seawater in the sealing cavity outside the armor layer at the penetration grooves on both sides of the insulating oil leakage point outside the armor layer, providing a space without insulating oil and seawater for the injection of sealants; injecting high-permeability sealant and low-permeability sealant to construct a sealing ring band outside the lead sheath, and the sealing ring band outside the lead sheath is used to plug the shaft displacement leakage of insulating oil along the gap between the lead sheath and the armor layer.

[0007] In a preferred embodiment of the method for plugging oil leakage due to shaft movement of the insulating oil of an oil-filled submarine cable according to the present invention: The grooving machine refers to a machine that can rotate 360° around the axis of the oil-filled submarine cable. The function of rotating 360° around the axis of the oil-filled submarine cable is to align the gaps between the armored copper bars of the armor layer. The axial direction has a spiral guide rail with the same pitch and helix angle as the armor layer. The function of having a spiral guide rail with the same pitch and helix angle as the armor layer in the axial direction is to ensure that the radial feed depth of the cutting tool is the same when moving along the axial direction. The grooving tool on the grooving machine can feed radially to the outer surface of the lead sheath. The function of the grooving tool on the grooving machine being able to feed radially to the outer surface of the lead sheath is to ensure that all layers outside the lead sheath are cut through while the outer surface of the lead sheath is not damaged.

[0008] To solve the above technical problems, the present invention also provides a device for plugging oil leakage due to shaft movement of the insulating oil of an oil-filled submarine cable, which includes a sleeve. Sealing sleeves are installed on both sides of the sleeve. One end of the sealing sleeve is installed with the sleeve, and the other end of the sealing sleeve is installed with a flange. There are guide sleeves and strip-shaped felts when the sealing sleeve is connected to the sleeve and the flange. A guide sleeve axial movement bolt and an accumulator are installed on the sealing sleeve.

[0009] In a preferred embodiment of the device for plugging oil leakage due to shaft movement of the insulating oil of an oil-filled submarine cable according to the present invention: The sleeve adopts a split structure and is divided into an upper sleeve and a lower sleeve. The function of the sleeve is to plug the insulating oil leaking from the oil leakage point outside the armor layer.

[0010] In a preferred embodiment of the device for plugging oil leakage due to shaft movement of the insulating oil of an oil-filled submarine cable according to the present invention: There is a sleeve sealing groove on the upper sleeve. The function of the sleeve sealing groove is to seal the gap between the installation surfaces of the upper sleeve and the lower sleeve.

[0011] In a preferred embodiment of the device for plugging oil leakage due to shaft movement of the insulating oil of an oil-filled submarine cable according to the present invention: The sealing sleeve adopts a split structure and is divided into an upper sealing sleeve and a lower sealing sleeve. The function of the sealing sleeve is to construct a sealing cavity outside the armor layer at the penetration groove.

[0012] In a preferred embodiment of the device for plugging oil leakage due to shaft movement of the insulating oil of an oil-filled submarine cable according to the present invention: There is a flange sealing groove on the upper sealing sleeve. The function of the flange sealing groove is to seal the gap between the installation surfaces of the sealing sleeve and the flange.

[0013] In a preferred embodiment of the device for plugging oil leakage due to shaft movement of the insulating oil of an oil-filled submarine cable according to the present invention: There is a sealing sleeve sealing groove on the upper sealing sleeve. The function of the sealing sleeve sealing groove is to seal the gap between the installation surfaces of the upper sealing sleeve and the lower sealing sleeve.

[0014] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: there is a sleeve side sealing groove on the upper plugging sleeve, and the function of the sleeve side sealing groove is to seal the gap between the sleeve and the plugging sleeve installation surface.

[0015] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: the guide sleeve adopts a split structure and is divided into an upper guide sleeve and a lower guide sleeve, and the function of the guide sleeve is to generate an axial displacement after being stressed to secondarily extrude the strip-shaped felt.

[0016] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: there is a large-spacing chamfer on the guide sleeve, and the function of the large-spacing chamfer is to increase the stress surface of the guide sleeve and facilitate the generation of axial displacement of the guide sleeve after being stressed.

[0017] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: there is a guide sleeve U-shaped groove on the guide sleeve, and the function of the guide sleeve U-shaped groove is to ensure that the upper sleeve and the lower sleeve generate the same axial displacement after being stressed.

[0018] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: when the strip-shaped felt is wound around the outer surface of the armor layer, the two ends are connected in an oblique angle manner, and the function of the strip-shaped felt is to seal the gap between the plugging sleeve and the outside of the armor layer after being extruded.

[0019] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: the flange adopts a split structure and is divided into an upper flange and a lower flange, and the function of the flange is to extrude the strip-shaped felt and connect for secondary plugging.

[0020] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: there is a flange U-shaped groove on the flange, and the function of the flange U-shaped groove is to ensure that the upper flange and the lower flange generate the same axial displacement after being stressed.

[0021] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: there is a reserved secondary plugging interface on the upper flange, and the function of the reserved secondary plugging interface is to be able to perform secondary plugging in time after the primary plugging fails, improving the ability of rapid emergency response.

[0022] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft creep leakage blocking device of the present invention: The guide sleeve axial movement bolt is installed on the blocking sleeve. The function of the guide sleeve axial movement bolt is to squeeze the guide sleeve to generate axial movement and then squeeze the strip-shaped felt. When initially installed, the guide sleeve axial movement bolt only needs to contact the large-spacing chamfer on the guide sleeve.

[0023] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft creep leakage blocking device of the present invention: The accumulator is installed on the blocking sleeve. The function of the accumulator is to maintain the pressure balance of the low-permeability sealant.

[0024] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft creep leakage blocking device of the present invention: The accumulator includes a piston. The function of the piston is to compress or release the pressure inside the accumulator.

[0025] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft creep leakage blocking device of the present invention: The accumulator includes an accumulator housing. The function of the accumulator housing is to withstand the internal pressure.

[0026] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft creep leakage blocking device of the present invention: The accumulator includes a thimble. The function of the thimble is to assist in adjusting the pressure relationship in the chamber between the sensor mounting seat and the sensor.

[0027] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft creep leakage blocking device of the present invention: The accumulator includes a sensor mounting seat. The function of the sensor mounting seat is to mount the sensor.

[0028] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft creep leakage blocking device of the present invention: The accumulator includes a sensor. The function of the sensor is to detect the magnitude of the pressure in the accumulator.

[0029] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft creep leakage blocking device of the present invention: The discharge pipeline includes a ball valve. The function of the ball valve is to control the on-off of the discharge pipeline.

[0030] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft creep leakage blocking device of the present invention: The discharge pipeline includes a quick connector. The function of the quick connector is to quickly complete the connection and disconnection of the discharge pipeline.

[0031] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft creep leakage blocking device of the present invention: The discharge pipeline includes a pressure sensor. The function of the pressure sensor is to detect the magnitude of the pressure at the discharge port.

[0032] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: the discharge pipeline includes a discharge port, and the function of the discharge port is to discharge seawater, insulating oil and sealant.

[0033] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: the injection pipeline includes a ball valve, and the function of the ball valve is to control the on-off of the injection pipeline.

[0034] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: the injection pipeline includes a quick connector, and the function of the quick connector is to quickly complete the connection and disconnection of the injection pipeline.

[0035] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: the injection pipeline includes a pressure sensor, and the function of the pressure sensor is to detect the pressure at the air injection port, the high-permeability sealant injection port and the low-permeability sealant injection port.

[0036] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: the injection pipeline includes a high-permeability sealant injection port, and the function of the high-permeability sealant injection port is to inject high-permeability sealant, and the function of the high-permeability sealant is to plug the shaft leakage of the insulating oil along the gaps between the layers outside the lead sheath.

[0037] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: the injection pipeline includes a low-permeability sealant injection port, and the function of the low-permeability sealant injection port is to inject low-permeability sealant. The low-permeability sealant completely replaces the high-permeability injection agent in the outer sealing cavity of the armor layer. The function of the low-permeability sealant in cooperation with the accumulator is to apply a radial pressure to the armor layer of the oil-filled submarine cable and squeeze the gap between the lead sheath and the armor layer of the oil-filled submarine cable.

[0038] In a preferred embodiment of the oil-filled submarine cable insulation oil shaft leakage plugging device of the present invention: the injection pipeline includes an air injection port, and the function of the air injection port is to inject air. The air injected by the air injection port discharges the seawater and insulating oil in the outer sealing cavity of the armor layer out of the plugging sleeve along the discharge port.

[0039] The beneficial effects of the present invention are as follows: Compared with the prior art, the present invention does not damage the continuity of the oil-filled submarine cable body. The method of cutting penetration grooves on both sides of the insulating oil leakage point outside the armor layer increases the permeability of the highly permeable sealant. The plugging device adopts a split structure, which is convenient for transportation and installation. Air purging ensures a space without insulating oil and seawater in the outer seal cavity of the armor layer. Injecting highly permeable sealant and low-permeable sealant to construct a sealing ring band outside the lead sheath completely solves the problem of insulating oil shaft leakage, reduces the repair cost, shortens the repair cycle, and breaks through the foreign technology monopoly. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention. Among them:

[0041] Figure 1 Shows a schematic diagram of the end face structure of the oil-filled submarine cable;

[0042] Figure 2 Shows a schematic diagram of the insulating oil leakage point outside the armor layer;

[0043] Figure 3 Shows a schematic diagram of the penetration grooves on both sides of the insulating oil leakage point outside the armor layer;

[0044] Figure 4 Shows a partial enlarged view of the penetration groove;

[0045] Figure 5 Shows a cross-sectional view of the penetration groove along the A-A section;

[0046] Figure 6 Shows a schematic diagram of the sleeve composition;

[0047] Figure 7 Shows a partial enlarged view of the sleeve sealing groove;

[0048] Figure 8 Shows a schematic diagram of the sleeve installed at the insulating oil leakage point outside the armor layer;

[0049] Figure 9 Shows a schematic diagram of the plugging sleeve composition;

[0050] Figure 10 Shows a partial enlarged view of the plugging sleeve sealing groove and the sleeve side sealing groove;

[0051] Figure 11 Shows a partial enlarged view of the flange sealing groove;

[0052] Figure 12 Shows a schematic diagram of the plugging sleeve installed at the penetration groove;

[0053] Figure 13 Shows a schematic diagram of the bushing assembly;

[0054] Figure 14 Shows a schematic diagram of the completed installation of the bushing after hiding the upper plugging sleeve;

[0055] Figure 15 Shows a schematic diagram of the strip-shaped felt;

[0056] Figure 16 Shows a schematic diagram of the completed installation of the strip-shaped felt after hiding the upper plugging sleeve;

[0057] Figure 17 Shows a schematic diagram of the completed installation of the plugging sleeve and the sleeve;

[0058] Figure 18 Shows a schematic diagram of the outer sealing ring band on the right side of the penetration groove on the left side of the outer insulation oil leakage point of the armored layer after hiding the upper plugging sleeve;

[0059] Figure 19 Shows a schematic diagram of the bushing and the strip-shaped felt on the left side of the penetration groove on the left side of the outer insulation oil leakage point of the armored layer after hiding the upper plugging sleeve;

[0060] Figure 20 Shows a schematic diagram of the flange assembly;

[0061] Figure 21 Shows a partial enlarged view of the reserved secondary plugging interface;

[0062] Figure 22 Shows a schematic diagram of the pre-installation of the flange and the plugging sleeve;

[0063] Figure 23 Shows a schematic diagram of the outer sealing ring band on the left side of the penetration groove on the left side of the outer insulation oil leakage point of the armored layer after hiding the upper plugging sleeve;

[0064] Figure 24 Shows a schematic diagram of the outer sealing ring band on the left side of the penetration groove on the right side of the outer insulation oil leakage point of the armored layer after hiding the upper plugging sleeve;

[0065] Figure 25 Shows a schematic diagram of the outer sealing ring band on the right side of the penetration groove on the right side of the outer insulation oil leakage point of the armored layer after hiding the upper plugging sleeve;

[0066] Figure 26 Shows a schematic diagram of the axial movement bolt of the bushing;

[0067] Figure 27 Shows a half-sectional view of the plugging device composed of the sleeve, the plugging sleeve, the bushing, the strip-shaped felt and the flange along the B-B section;

[0068] Figure 28 An axonometric view of the plugging device composed of a sleeve, a plugging sleeve, a guide sleeve, a strip felt, and a flange after being half-sectioned along the B-B section is shown;

[0069] Figure 29 A schematic diagram of the pre-installation of the guide sleeve axial movement bolt on the plugging sleeve is shown;

[0070] Figure 30 A schematic diagram of the composition of the accumulator is shown;

[0071] Figure 31 A schematic diagram of the accumulator installed on the plugging sleeve is shown;

[0072] Figure 32 A schematic diagram of the circumferential distribution of the accumulator after being installed on the plugging sleeve is shown;

[0073] Figure 33 A schematic diagram of the composition of the discharge pipeline and the injection pipeline is shown;

[0074] Figure 34 A schematic diagram of the discharge pipeline and the injection pipeline installed on the plugging sleeve is shown;

[0075] Figure 35 A cross-sectional view of the outer sealing cavity of the armored layer along the C-C section after injecting the high-permeability sealant is shown;

[0076] Figure 36 A schematic diagram of the high-permeability sealant filling the penetration groove and the outer sealing cavity of the armored layer is shown;

[0077] Figure 37 A partial enlarged view of the high-permeability sealant filling the penetration groove and the outer sealing cavity of the armored layer is shown;

[0078] Figure 38 A schematic diagram of injecting the low-permeability sealant to displace the high-permeability sealant in the outer sealing cavity of the armored layer is shown;

[0079] Figure 39 A partial enlarged view of injecting the low-permeability sealant to displace the high-permeability sealant in the outer sealing cavity of the armored layer is shown.

[0080] In the figure: 1. Oil-filled submarine cable, 1.1 Insulating oil duct, 1.2 Conductor, 1.3 Insulating layer, 1.4 Lead sheath, 1.5 Anticorrosion layer, 1.6 Armor layer, 1.7 Insulating oil leakage point outside the armor layer; 2. Penetration tank; 3. Sleeve, 3.1 Upper sleeve, 3.1.1 Sleeve sealing groove, 3.2 Lower sleeve; 4. Sealing plug sleeve, 4.1 Upper sealing plug sleeve, 4.1.1 Flange sealing groove, 4.1.2 Sealing plug sleeve sealing groove, 4.1.3 Sleeve side sealing groove, 4.2 Lower sealing plug sleeve; 5. Guide sleeve, 5.1 Upper guide sleeve, 5.2 Lower guide sleeve, 5.3 Large-spacing chamfer, 5.4 Guide sleeve "J"-shaped groove; 6. Strip-shaped felt, 6.1 Oblique-angle connection; 7. Outer sealing ring band of the armor layer on the right side of the penetration tank on the left side of the insulating oil leakage point outside the armor layer; 8. Flange, 8.1 Upper flange, 8.1.1 Reserved secondary sealing interface, 8.2 Lower flange, 8.3 Flange "J"-shaped groove; 9. Outer sealing ring band of the armor layer on the left side of the penetration tank on the left side of the insulating oil leakage point outside the armor layer; 10. Outer sealing ring band of the armor layer on the left side of the penetration tank on the right side of the insulating oil leakage point outside the armor layer; 11. Outer sealing ring band of the armor layer on the right side of the penetration tank on the right side of the insulating oil leakage point outside the armor layer; 12. Axial movement bolt of the guide sleeve; 13. Accumulator, 13.1 Piston, 13.2 Accumulator housing, 13.3 Thimble, 13.4 Sensor mounting seat, 13.5 Sensor; 14. Discharge pipeline, 14.1 Ball valve, 14.2 Quick connector, 14.3 Pressure sensor, 14.4 Discharge port; 15. Injection pipeline, 15.1 Ball valve, 15.2 Quick connector, 15.3 Pressure sensor, 15.4 High-permeability sealant injection port, 15.5 Low-permeability sealant injection port, 15.6 Air injection port; 16. High-permeability sealant; 17. Low-permeability sealant. Detailed implementation manners

[0081] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the detailed implementation manners and the accompanying drawings.

[0082] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention. However, these terms may change according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0083] Reference Figure 1 and Figure 2, the oil-filled submarine cable 1 is described, including an insulating oil duct 1.1, a conductor 1.2, an insulating layer 1.3, a lead sheath 1.4, an anticorrosion layer 1.5, and an armor layer 1.6. The insulating oil in the insulating oil duct 1.1 penetrates into the insulating layer 1.3 along the gaps of the conductor 1.2. The insulating oil in the insulating layer 1.3 penetrates into the gap between the lead sheath 1.4 and the anticorrosion layer 1.5 at the fatigue breakage of the lead sheath 1.4. The phenomenon that the insulating oil penetrating into the gap between the lead sheath 1.4 and the anticorrosion layer 1.5 flows in the axial direction is called insulating oil axial leakage. The insulating oil that axially leaks along the gap between the lead sheath 1.4 and the anticorrosion layer 1.5 penetrates into the gap between the anticorrosion layer 1.5 and the armor layer 1.6 at the fatigue breakage of the anticorrosion layer 1.5. The phenomenon that the insulating oil penetrating into the gap between the anticorrosion layer 1.5 and the armor layer 1.6 flows in the axial direction is called insulating oil axial leakage. The insulating oil that axially leaks in the gap between the anticorrosion layer 1.5 and the armor layer 1.6 leaks outside the armor layer 1.6. The position where the insulating oil leaks outside the armor layer 1.6 is called the external insulating oil leakage point 1.7 of the armor layer.

[0084] Further, referring to Figure 3 , after the external insulating oil leakage point 1.7 of the armor layer is determined, a slotting machine is used to cut penetration slots 2 on both sides of the external insulating oil leakage point 1.7 of the armor layer. The penetration slots 2 are formed by the slotting machine rotating 360 degrees around the axis of the oil-filled submarine cable 1, and the cutting tool moving axially and radially. The function of the slotting machine rotating 360 degrees around the axis of the oil-filled submarine cable 1 is to align the gaps between the armor copper bars of the armor layer 1.6. The axial movement refers to the movement along a spiral guide rail with the same pitch and helix angle as the armor copper bars of the armor layer 1.6. The radial movement refers to the cutting tool feeding radially to the outer surface of the lead sheath 1.4.

[0085] Further, referring to Figure 4 and Figure 5 , the penetration slots 2 are along the gaps between the armor copper bars of the armor layer 1.6, maintaining the integrity of the armor layer 1.6 and the anticorrosion layer 1.5. The penetration slots 2 increase the flow channels of the high-permeability sealant 16, ensuring that the high-permeability sealant 16 penetrates into the gaps between the outer layers of the lead sheath 1.4.

[0086] Further, referring to Figure 6 and Figure 7 , the sleeve 3 adopts a split structure and is divided into an upper sleeve 3.1 and a lower sleeve 3.2. There is a sleeve sealing groove 3.1.1 on the upper sleeve 3.1. The function of the sleeve sealing groove 3.1.1 is to seal the gap between the installation surfaces of the upper sleeve 3.1 and the lower sleeve 3.2.

[0087] Further, referring to Figure 8, the sleeve 3 is installed on the oil-filled submarine cable 1, and the function of the sleeve 3 is to block the insulating oil leaking from the leakage point 1.7 of the outer insulation oil of the armor layer.

[0088] Further, referring to Figure 9 , Figure 10 and Figure 11 , the plugging sleeve 4 adopts a split structure and is divided into an upper plugging sleeve 4.1 and a lower plugging sleeve 4.2. The upper plugging sleeve 4.1 has a flange sealing groove 4.1.1, a plugging sleeve sealing groove 4.1.2 and a sleeve side sealing groove 4.1.3. The function of the flange sealing groove 4.1.1 is to seal the gap between the plugging sleeve 4 and the installation surface of the flange 8. The function of the plugging sleeve sealing groove 4.1.2 is to seal the gap between the installation surfaces of the upper plugging sleeve 4.1 and the lower plugging sleeve 4.2. The function of the sleeve side sealing groove 4.1.3 is to seal the gap between the sleeve 3 and the installation surface of the plugging sleeve 4.

[0089] Further, referring to Figure 12 , the plugging sleeve 4 is installed at the penetration groove 2, and the function of the plugging sleeve 4 is to construct an outer sealing cavity of the armor layer at the penetration groove 2.

[0090] Further, referring to Figure 13 , the guide sleeve 5 adopts a split structure and is divided into an upper guide sleeve 5.1 and a lower guide sleeve 5.2. The guide sleeve 5 has a large-spacing chamfer 5.3, and the function of the large-spacing chamfer 5.3 is to increase the force-bearing surface of the guide sleeve 5 and facilitate the axial displacement of the guide sleeve 5 after being stressed.

[0091] Further, referring to Figure 13 , the guide sleeve 5 has a guide sleeve U-shaped groove 5.4, and the function of the guide sleeve U-shaped groove 5.4 is to ensure that the upper sleeve 5.1 and the lower sleeve 5.2 produce the same axial displacement after being stressed.

[0092] Further, referring to Figure 14 , the guide sleeve 5 is installed at the penetration groove 2, and the function of the guide sleeve 5 is to produce an axial displacement after being stressed to secondarily extrude the strip-shaped felt 6.

[0093] Further, referring to Figure 15 and Figure 16 , when the strip-shaped felt 6 is wound around the outer surface of the armor layer 1.6, the two ends are connected by an oblique angle connection 6.1. The function of the strip-shaped felt 6 is to seal the gap between the plugging sleeve 4 and the outside of the armor layer 1.6 after being extruded.

[0094] Further, referring to Figure 17 and Figure 18, the plugging sleeve 4 is bolted to the sleeve 3. The strip-shaped felt 6 is extruded to seal the gap between the plugging sleeve 4 and the outside of the armored layer 1.6 at the left penetration groove 2 of the external insulating oil leakage point 1.7 of the armored layer, which is called the right armored layer outer sealing ring belt 7 on the left side of the left penetration groove of the external insulating oil leakage point of the armored layer.

[0095] Further, referring to Figure 19 , the guide sleeve 5 and the strip-shaped felt 6 are installed on the left side of the left penetration groove 2 of the external insulating oil leakage point 1.7 of the armored layer.

[0096] Further, referring to Figure 20 , the flange 8 adopts a split structure and is divided into an upper flange 8.1 and a lower flange 8.2. There is a flange U-shaped groove 8.3 on the flange 8. The function of the flange U-shaped groove 8.3 is to ensure that the upper flange 8.1 and the lower flange 8.2 generate the same axial displacement after being stressed.

[0097] Further, referring to Figure 21 , there is a reserved secondary plugging interface 8.1.1 on the upper flange 8.1. The function of the reserved secondary plugging interface 8.1.1 is to be able to carry out secondary plugging in time after the primary plugging fails, improving the ability of rapid emergency response.

[0098] Further, referring to Figure 22 and Figure 23 , the flange 8 is bolted to the plugging sleeve 4. The strip-shaped felt 6 is extruded to seal the gap between the plugging sleeve 4 and the outside of the armored layer 1.6 at the left penetration groove 2 of the external insulating oil leakage point 1.7 of the armored layer, which is called the left armored layer outer sealing ring belt 9 on the left side of the left penetration groove of the external insulating oil leakage point of the armored layer.

[0099] Further, referring to Figure 18 and Figure 23 , the plugging sleeve 4, the outer surface of the armored layer 1.6, the right armored layer outer sealing ring belt 7 on the left side of the left penetration groove of the external insulating oil leakage point of the armored layer and the left armored layer outer sealing ring belt 9 on the left side of the left penetration groove of the external insulating oil leakage point of the armored layer form an outer sealing cavity of the armored layer.

[0100] Further, referring to Figure 24 , the plugging sleeve 4 is bolted to the sleeve 3. The strip-shaped felt 6 is extruded to seal the gap between the plugging sleeve 4 and the outside of the armored layer 1.6 at the right penetration groove 2 of the external insulating oil leakage point 1.7 of the armored layer, which is called the left armored layer outer sealing ring belt 10 on the right side of the right penetration groove of the external insulating oil leakage point of the armored layer.

[0101] Further, referring to Figure 25, the flange 8 is bolted to the plugging sleeve 4. After being squeezed, the strip-shaped felt 6 seals the gap between the plugging sleeve 4 and the outside of the armored layer 1.6 at the penetration groove 2 on the right side of the external insulating oil leakage point 1.7 of the armored layer, which is called the right-side armored layer external sealing ring belt 11 of the penetration groove on the right side of the external insulating oil leakage point of the armored layer.

[0102] Further, referring to Figure 24 and Figure 25 , the plugging sleeve 4, the outer surface of the armored layer 1.6, the left-side armored layer external sealing ring belt 10 of the penetration groove on the right side of the external insulating oil leakage point of the armored layer, and the right-side armored layer external sealing ring belt 11 of the penetration groove on the right side of the external insulating oil leakage point of the armored layer form an external armored layer sealing cavity.

[0103] Further, referring to Figure 26 , the guide sleeve axial movement bolt 12 is installed on the plugging sleeve 4. The function of the guide sleeve axial movement bolt 12 is to squeeze the guide sleeve 5 to generate axial movement and then squeeze the strip-shaped felt 6.

[0104] Further, referring to Figure 27 and Figure 28 , the function of the plugging device composed of the sleeve 3, the plugging sleeve 4, the guide sleeve 5, the strip-shaped felt 6 and the flange 8 when sectioned along the B-B section is to be able to observe the installation relationship between the guide sleeve axial movement bolt 12 and the guide sleeve 5.

[0105] Further, referring to Figure 29 , when initially installed, the guide sleeve axial movement bolt 12 only needs to contact the large-spacing chamfer 5.3 on the guide sleeve 5.

[0106] Further, referring to Figure 30 , the accumulator 13 includes a piston 13.1, an accumulator housing 13.2, a thimble 13.3, a sensor mounting seat 13.4 and a sensor 13.5. The function of the piston 13.1 is to compress or release the pressure inside the accumulator 13. The function of the accumulator housing 13.2 is to bear the internal pressure. The function of the thimble 13.3 is to assist in adjusting the pressure relationship in the chamber between the sensor mounting seat 13.4 and the sensor 13.5. The function of the sensor mounting seat 13.4 is to mount the sensor 13.5. The function of the sensor 13.5 is to detect the magnitude of the pressure in the accumulator 13.

[0107] Further, referring to Figure 31 and Figure 32 , the accumulator 13 is installed on the plugging sleeve 4. Two accumulators 13 are installed on the upper plugging sleeve 4.1, and two accumulators 13 are installed on the lower plugging sleeve 4.2. The function of the accumulator 13 is to maintain the pressure balance of the low-permeability sealant 17.

[0108] Further, referring toFigure 33 , the discharge pipeline 14 includes a ball valve 14.1, a quick connector 14.2, a pressure sensor 14.3, and a discharge port 14.4. The function of the ball valve 14.1 is to control the on / off of the discharge pipeline 14. The function of the quick connector 14.2 is to quickly complete the connection and disconnection of the discharge pipeline 14. The function of the pressure sensor 14.3 is to detect the magnitude of the pressure at the discharge port 14.4. The function of the discharge port 14.4 is to discharge seawater, insulating oil, and sealant.

[0109] Further, referring to Figure 33 , the injection pipeline 15 includes a ball valve 15.1, a quick connector 15.2, a pressure sensor 15.3, a high-permeability sealant injection port 15.4, a low-permeability sealant injection port 15.5, and an air injection port 15.6. The function of the ball valve 15.1 is to control the on / off of the injection pipeline 15. The function of the quick connector 15.2 is to quickly complete the connection and disconnection of the injection pipeline 15. The function of the pressure sensor 15.3 is to detect the magnitude of the pressure at the air injection port 15.6, the high-permeability sealant injection port 15.4, and the low-permeability sealant injection port 15.5. The function of the high-permeability sealant injection port 15.4 is to inject high-permeability sealant 16. The function of the low-permeability sealant injection port 15.5 is to inject low-permeability sealant 17. The function of the air injection port 15.6 is to inject air.

[0110] Further, referring to Figure 34 , the discharge pipeline 14 is installed on the upper plugging sleeve 4.1, and the injection pipeline 15 is installed on the lower plugging sleeve 4.2.

[0111] Further, referring to Figure 33 and Figure 34 , when the ball valves 15.1 and 14.1 are opened, the air injected through the air injection port 15.6 discharges the seawater and insulating oil in the outer sealing cavity of the armored layer along the discharge port 14.4 from the plugging sleeve 4, and then the ball valves 15.1 and 14.1 are closed.

[0112] Further, referring to Figure 33 and Figure 34 , when the ball valves 15.1 and 14.1 are opened, the high-permeability sealant 16 is injected through the high-permeability sealant injection port 15.4 to fill the outer sealing cavity of the armored layer and penetrate into the gap between the outer surface of the lead sheath 1.4 along the penetration groove 2. When the high-permeability sealant 16 appears at the discharge port 14.4, the ball valve 14.1 is closed. When the high-permeability sealant 16 oozes out at the flange 8, the ball valve 15.1 is closed.

[0113] Further, referring to Figure 35, the purpose of the full section of the plugging sleeve 4 and the accumulator 13 along the C-C section is to observe the penetration of the highly permeable sealant 16 in the penetration groove 2.

[0114] Further, referring to Figure 36 and Figure 37 , the highly permeable sealant 16 penetrates between the layers outside the lead sheath 1.4, in the penetration groove 2 and in the outer seal cavity of the armor layer. The function of the highly permeable injection agent 16 is to plug the axial leakage of insulating oil along the gap between the layers outside the lead sheath 1.4.

[0115] Further, referring to Figure 33 and Figure 34 , the ball valves 15.1 and 14.1 are opened, and the low-permeability injection agent inlet 15.5 injects the low-permeability sealant 17 to displace the highly permeable sealant 16 in the outer seal cavity of the armor layer. When there is no highly permeable injection agent 16 in the low-permeability injection agent 17 discharged from the discharge port 14.4, the ball valve 14.1 is closed. When the pressure sensor 15.3 reaches the target value, the ball valve 15.1 is closed.

[0116] Further, referring to Figure 38 and Figure 39 , the low-permeability sealant 17 completely displaces the highly permeable injection agent 16 in the outer seal cavity of the armor layer. The function of the low-permeability sealant 17 in cooperation with the accumulator 13 is to apply a radial pressure to the armor layer 1.6 of the oil-filled submarine cable 1 and squeeze the gap between the lead sheath 1.4 and the armor layer 1.6 of the oil-filled submarine cable 1.

[0117] Finally, it should be noted that the methods and devices described in detail above are only examples, and those skilled in the art can modify these examples in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A method for plugging the leakage of the insulating oil shaft of an oil-filled submarine cable, characterized in that: It includes using a grooving machine to cut penetration grooves (2) on both sides of the insulating oil leakage point (1.7) outside the armor layer; installing a plugging device composed of a sleeve (3), a plugging sleeve (4), a guide sleeve (5), a strip-shaped felt (6) and a flange (8). The function of the sleeve (3) is to plug the insulating oil leakage point (1.7) outside the armor layer. The function of the plugging sleeve (4) is to construct an external sealing cavity of the armor layer at the penetration grooves (2) on both sides of the insulating oil leakage point (1.7) outside the armor layer; connecting the pipeline of the air injection port (15.6). The function of the air is to discharge the insulating oil and seawater in the external sealing cavity of the armor layer at the penetration grooves (2) on both sides of the insulating oil leakage point (1.7) outside the armor layer, providing a space without insulating oil and seawater for the injection of the sealant; injecting a high-permeability sealant (16) and a low-permeability sealant (17) to construct an external sealing ring band of the lead sheath. The function of the external sealing ring band of the lead sheath is to plug the axial leakage of the insulating oil along the gap between the lead sheath (1.4) and the armor layer (1.6).

2. A method for plugging the leakage of the insulating oil caused by the axial movement of the oil-filled submarine cable according to claim 1, characterized in that: The grooving machine refers to a machine that can rotate 360° around the axis of the oil-filled submarine cable (1). The function of rotating 360° around the axis of the oil-filled submarine cable (1) is to align the gaps between the armor copper bars of the armor layer (1.6); it has a spiral guide rail in the axial direction with the same pitch and helix angle as the armor layer (1.6). The function of having a spiral guide rail in the axial direction with the same pitch and helix angle as the armor layer (1.6) is to ensure that the radial feed depth is the same when the cutting tool moves in the axial direction; the grooving tool on the grooving machine can feed radially to the outer surface of the lead sheath (1.4). The function of the grooving tool on the grooving machine can feed radially to the outer surface of the lead sheath (1.4) is to ensure that each layer outside the lead sheath (1.4) is cut through, while the outer surface of the lead sheath (1.4) is not damaged.

3. An oil-filled submarine cable insulating oil shaft creepage leakage blocking device, characterized in that: It includes a sleeve (3). Plugging sleeves (4) are installed on both sides of the sleeve (3). One end of the plugging sleeve (4) is installed with the sleeve (3), and the other end of the plugging sleeve (4) is installed with a flange (8). There are guide sleeves (5) and strip-shaped felts (6) when the plugging sleeve (4) is connected to the sleeve (3) and the flange (8). A guide sleeve axial movement bolt (12) and an accumulator (13) are installed on the plugging sleeve (4).

4. The oil-filled submarine cable insulating oil shaft creepage leakage plugging device according to claim 2, characterized in that: The sleeve (3) adopts a split structure and is divided into an upper sleeve (3.1) and a lower sleeve (3.2). The function of the sleeve (3) is to plug the insulating oil leaked from the insulating oil leakage point (1.7) outside the armor layer.

5. The oil-filled submarine cable insulating oil shaft creepage leakage blocking device according to claim 3, characterized in that: There is a sleeve sealing groove (3.1.1) on the upper sleeve (3.1). The function of the sleeve sealing groove (3.1.1) is to seal the gap between the installation surfaces of the upper sleeve (3.1) and the lower sleeve (3.2).

6. The oil-filled submarine cable insulating oil shaft creepage leakage blocking device according to claim 4, wherein: The plugging sleeve (4) adopts a split structure and is divided into an upper plugging sleeve (4.1) and a lower plugging sleeve (4.2). The function of the plugging sleeve (4) is to construct an external sealing cavity of the armor layer at the penetration groove (2).

7. The oil-filled submarine cable insulating oil shaft creepage leakage plugging device according to claim 5, characterized in that: The upper plugging sleeve (4.1) is provided with a flange sealing groove (4.1.1), and the function of the flange sealing groove (4.1.1) is to seal the gap between the plugging sleeve (4) and the mounting surface of the flange (8).

8. A device for sealing the leakage of oil shaft movement in an oil-filled submarine cable according to claim 6, characterized in that: The upper plugging sleeve (4.1) is provided with a plugging sleeve sealing groove (4.1.2), and the function of the plugging sleeve sealing groove (4.1.2) is to seal the gap between the upper plugging sleeve (4.1) and the mounting surface of the lower plugging sleeve (4.2).

9. The oil-filled submarine cable insulating oil shaft creepage leakage plugging device according to claim 7, characterized in that: The upper plugging sleeve (4.1) is provided with a sleeve side sealing groove (4.1.3), and the function of the sleeve side sealing groove (4.1.3) is to seal the gap between the sleeve (3) and the mounting surface of the plugging sleeve (4).

10. The oil-filled submarine cable insulating oil shaft creepage leakage plugging device according to claim 8, characterized in that: The guide sleeve (5) adopts a split structure and is divided into an upper guide sleeve (5.1) and a lower guide sleeve (5.2), and the function of the guide sleeve (5) is to generate an axial displacement after being stressed to squeeze the strip-shaped felt (6) twice.

11. The leak plugging device for axial movement and leakage of insulating oil of an oil-filled submarine cable according to claim 9, characterized in that: The guide sleeve (5) is provided with a large-spacing chamfer (5.3), and the function of the large-spacing chamfer (5.3) is to increase the stress surface of the guide sleeve (5) to facilitate the guide sleeve (5) to generate an axial displacement after being stressed.

12. The oil-filled submarine cable insulating oil shaft creepage leakage blocking device according to claim 10, wherein: The guide sleeve (5) is provided with a guide sleeve U-shaped groove (5.4), and the function of the guide sleeve U-shaped groove (5.4) is to ensure that the upper sleeve (5.1) and the lower sleeve (5.2) generate the same axial displacement after being stressed.

13. The oil-filled submarine cable insulating oil shaft creepage leakage blocking device according to claim 11, characterized in that: When the strip-shaped felt (6) is wound around the outer surface of the armored layer (1.6), the two ends are connected by an oblique angle connection (6.1), and the function of the strip-shaped felt (6) is to seal the gap between the plugging sleeve (4) and the outside of the armored layer (1.6) after being squeezed.

14. The oil-filled submarine cable insulating oil shafting leakage plugging device according to claim 12, wherein: The flange (8) adopts a split structure and is divided into an upper flange (8.1) and a lower flange (8.2), and the function of the flange (8) is to squeeze the strip-shaped felt (6) and connect for secondary plugging.

15. The oil-filled submarine cable insulating oil shaft creepage leakage blocking device according to claim 13, characterized in that: The flange (8) is provided with a flange U-shaped groove (8.3), and the function of the flange U-shaped groove (8.3) is to ensure that the upper flange (8.1) and the lower flange (8.2) generate the same axial displacement after being stressed.

16. A device for sealing the leakage of the oil shaft displacement of an oil-filled submarine cable according to claim 14, characterized in that: The upper flange (8.1) is provided with a reserved secondary plugging interface (8.1.1), and the function of the reserved secondary plugging interface (8.1.1) is to be able to perform secondary plugging in time after the primary plugging fails, improving the ability of rapid emergency response.

17. The oil-filled submarine cable insulating oil shaft creepage leakage plugging device according to claim 15, characterized in that: The guide sleeve axial movement bolt (12) is installed on the plugging sleeve (4), and the function of the guide sleeve axial movement bolt (12) is to squeeze the guide sleeve (5) to generate an axial movement and then squeeze the strip-shaped felt (6). The guide sleeve axial movement bolt (12) only needs to be in contact with the large-spacing chamfer (5.3) on the guide sleeve (5) during initial installation.

18. The oil-filled submarine cable insulation oil shaft creepage leakage plugging device according to claim 16, characterized in that: The accumulator (13) is installed on the plugging sleeve (4), and the function of the accumulator (13) is to maintain the pressure balance of the low-permeability sealant (17).

19. The oil-filled submarine cable insulating oil shaft creepage leakage blocking device according to claim 17, wherein: The accumulator (13) includes a piston (13.1), and the function of the piston (13.1) is to compress or release the pressure inside the accumulator (13).

20. The oil-filled submarine cable insulating oil shaft creepage leakage plugging device according to claim 18, wherein: The accumulator (13) includes an accumulator housing (13.2), and the function of the accumulator housing (13.2) is to withstand the internal pressure.

21. The oil-filled submarine cable insulation oil shaft displacement leakage plugging device according to claim 19, wherein: The accumulator (13) includes a thimble (13.3), and the function of the thimble (13.3) is to assist in adjusting the pressure relationship in the chamber between the sensor mount (13.4) and the sensor (13.5).

22. The oil-filled submarine cable insulating oil shaft creepage leakage plugging device according to claim 20, wherein: The accumulator (13) includes a sensor mount (15.4), and the function of the sensor mount (15.4) is to mount the sensor (13.5).

23. The oil-filled submarine cable insulation oil shaft creepage leakage blocking device according to claim 21, characterized in that: The accumulator (13) includes a sensor (13.5), and the function of the sensor (13.5) is to detect the magnitude of the pressure in the accumulator (13).

24. The oil-filled submarine cable insulating oil shaft creepage leakage blocking device according to claim 22, wherein: The discharge pipeline (14) includes a ball valve (14.1), and the function of the ball valve (14.1) is to control the on / off of the discharge pipeline (14).

25. The oil-filled submarine cable insulating oil shafting leakage plugging device according to claim 23, characterized in that: The discharge pipeline (14) includes a quick connector (14.2), and the function of the quick connector (14.2) is to quickly complete the connection and disconnection of the discharge pipeline (14).

26. The oil-filled submarine cable insulation oil shaft creepage leakage blocking device according to claim 24, characterized in that: The discharge pipeline (14) includes a pressure sensor (14.3), and the function of the pressure sensor (14.3) is to detect the magnitude of the pressure at the discharge port (14.4).

27. The oil-filled submarine cable insulation oil shaft creepage leakage blocking device according to claim 25, wherein: The discharge pipeline (14) includes a discharge port (14.4), and the function of the discharge port (14.4) is to discharge seawater, insulating oil, and sealant.

28. The oil-filled submarine cable insulating oil shaft creepage leakage plugging device according to claim 26, wherein: The injection pipeline (15) includes a ball valve (15.1), and the function of the ball valve (15.1) is to control the on / off of the injection pipeline (15).

29. The oil-filled submarine cable insulating oil shaft creepage leakage blocking device according to claim 27, wherein: The injection pipeline (15) includes a quick connector (15.2), and the function of the quick connector (15.2) is to quickly complete the connection and disconnection of the injection pipeline (15).

30. The oil-filled submarine cable insulation oil shaft creepage leakage plugging device according to claim 28, characterized in that: The injection pipeline (15) includes a pressure sensor (15.3), and the function of the pressure sensor (15.3) is to detect the magnitude of the pressure at the air injection port (15.6), the high-permeability sealant injection port (15.4), and the low-permeability sealant injection port (15.5).

31. The oil-filled submarine cable insulating oil shaft creepage leakage plugging device according to claim 29, characterized in that: The injection pipeline (15) includes a high-permeability sealant injection port (15.4), and the function of the high-permeability sealant injection port (15.4) is to inject a high-permeability sealant (16), and the function of the high-permeability sealant (16) is to block the axial leakage of insulating oil along the gaps between the outer layers of the lead sheath (1.4).

32. The oil-filled submarine cable insulating oil shaft creepage leakage blocking device according to claim 30, wherein: The injection pipeline (15) includes a low-permeability sealant injection port (15.5), and the function of the low-permeability sealant injection port (15.5) is to inject a low-permeability sealant (17). The low-permeability sealant (17) completely replaces the high-permeability injection agent (16) in the outer sealing cavity of the armor layer. The function of the low-permeability sealant (17) in cooperation with the accumulator (13) is to apply a radial pressure to the armor layer (1.6) of the oil-filled submarine cable (1), squeezing the gap between the lead sheath (1.4) and the armor layer (1.6) of the oil-filled submarine cable (1).

33. The oil-filled submarine cable insulating oil shaft creepage leakage blocking device according to claim 31, characterized in that: The injection pipeline (15) includes an air injection port (15.6) for injecting air. The air injected through the air injection port (15.6) discharges the seawater and insulating oil in the outer sealing cavity of the armor layer along the discharge port (14.4) out of the plugging sleeve (4).

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