Oil-filled submarine cable sealing and repair device

Abstract

An oil-filled submarine cable sealing and repair device. The oil-filled submarine cable sealing and repair device comprises a main housing (21) and a sealing assembly (22). The main housing (21) is configured to be sleeved over a segment of an oil-filled submarine cable where a leakage point is located. The sealing assembly (22) is disposed in the main housing (21). The sealing assembly (22) is used to axially partition the space between the main housing (21) and the oil-filled submarine cable into an oil leakage region (213) corresponding to the leakage point, at least one first sealing region (214) located on one side of the oil leakage region (213), and at least one second sealing region (215) located on the other side of the oil leakage region (213). The oil leakage region (213) is in communication with an oil discharge valve (23), and the first sealing region (214) and the second sealing region (215) are each filled with a sealing adhesive. The oil-filled submarine cable sealing and repair device can seal leakage of the oil-filled submarine cable without damaging an armor layer (18).

Description

Oil-filled cable plugging repair device TECHNICAL FIELD

[0001] The present application relates to the technical field of oil-filled cable repair, in particular to an oil-filled cable plugging repair device. BACKGROUND

[0002] The oil-filled cable is a kind of submarine cable that uses insulating oil as a pressurized fluid and enables the insulating oil to flow freely in the cable. After the oil-filled cable is damaged, the insulating oil inside the oil-filled cable will leak, which not only pollutes the seawater but also affects the stable operation of the power grid system.

[0003] At present, there are splicing repair, water isolation repair and plugging repair for repairing the oil-filled cable, among which the plugging repair forms a physical plugging outside the damaged point without repairing the body, and the plugging repair has the technical advantages of being simple, fast and low in cost.

[0004] At present, the plugging repair of the oil-filled cable mostly refers to the plugging repair of the submarine oil and gas pipeline. However, the traditional plugging repair of the submarine oil and gas pipeline is not ideal for the plugging repair of the oil-filled cable. SUMMARY

[0005] Therefore, it is necessary to provide an oil-filled cable plugging repair device for improving the plugging repair effect of the oil-filled cable leakage.

[0006] An oil-filled cable plugging repair device comprises:

[0007] a main shell for sleeving on a section where a leakage point of an oil-filled cable is located; and

[0008] a sealing assembly arranged in the main shell, the sealing assembly being used to divide a space between the main shell and the oil-filled cable into an oil leakage area corresponding to the leakage point, at least one first sealing area on one side of the oil leakage area, and at least one second sealing area on the other side of the oil leakage area along an axial direction of the main shell, wherein the oil leakage area is communicated with an oil discharge valve, and the first sealing area and the second sealing area are both filled with sealing glue.

[0009] The technical solutions are further described as follows:

[0010] In one of the embodiments, the main shell comprises a first half shell and a second half shell, and the first half shell and the second half shell are connected to each other and jointly form a cylindrical structure.

[0011] In one of the embodiments, the sealing assembly comprises a sealing strip arranged in the joint gap between the first half shell and the second half shell, and at least two annular sealing pads arranged axially spaced apart along the main housing and sealingly fitted with the main housing and the oil-filled submarine cable to divide the space between the main housing and the oil-filled submarine cable into the oil leakage zone, the first sealing zone and the second sealing zone.

[0012] In one of the embodiments, the inner wall of the main housing is provided with at least two sealing ring grooves arranged axially spaced apart along the main housing, and the annular sealing pads are correspondingly embedded in the sealing ring grooves.

[0013] In one of the embodiments, the oil leakage zone is communicated with two oil discharge valves arranged opposite along the radial direction of the main housing.

[0014] In one of the embodiments, the first sealing zone and the second sealing zone are both communicated with a glue injection valve and a glue discharge valve, and the glue injection valve and the glue discharge valve are arranged opposite along the radial direction of the main housing, with the glue injection valve located below the glue discharge valve.

[0015] In one of the embodiments, the main housing is provided with a first connecting flange at each end, the first connecting flange is used for connecting with a joint housing, the joint housing is used for sleeving on the oil-filled submarine cable, and a sealed third sealing zone is formed in the space between the joint housing and the oil-filled submarine cable, and the third sealing zone is filled with the sealing glue.

[0016] In one of the embodiments, the joint housing is provided with a second connecting flange and a third connecting flange at each end, the second connecting flange is used for connecting with the first connecting flange, and the third connecting flange is used for connecting with the second connecting flange of another joint housing.

[0017] In one of the embodiments, the first connecting flange is provided with a threaded through hole for penetrating a threaded connecting piece, and the second connecting flange and the third connecting flange are both provided with a waist-shaped hole for penetrating a threaded connecting piece.

[0018] In one of the embodiments, the end face of the first connecting flange and the end face of the third connecting flange are both provided with a tapered groove, and the end face of the second connecting flange is provided with a cylindrical groove.

[0019] A tapered sealing ring is arranged between the main housing and the joint housing, and / or a tapered sealing ring is arranged between adjacent two joint housings.

[0020] The small-diameter end of the conical sealing ring is embedded in the conical groove, and the large-diameter end of the conical sealing ring is embedded in the cylindrical groove.

[0021] In the oil-filled submarine cable plugging and repairing device, the space between the main shell and the oil-filled submarine cable is divided into a leakage oil area and first and second sealing areas located on the two sides of the leakage oil area by the sealing assembly. The leaked insulating oil can be discharged from the leakage oil area through the oil discharge valve, thereby greatly reducing the possibility of insulating oil leakage into the first and second sealing areas, preventing the glue in the first and second sealing areas from being washed away by oil, and ensuring the stability of the glue pouring process into the first and second sealing areas. Therefore, the glue pouring can be carried out synchronously during the oil discharging process, improving the efficiency of plugging and repairing. Meanwhile, the sealing glue is filled into the first and second sealing areas at a certain pressure, and the sealing glue can penetrate to the outside of the PE layer along the copper strip gap of the armored layer and the gap between the armored layer and the PE layer under pressure to fill the copper strip gap of the armored layer and the gap between the armored layer and the PE layer, avoiding the possibility of axial leakage of insulating oil along the copper strip gap of the armored layer and the gap between the armored layer and the PE layer, thereby realizing the leakage plugging of the part of the oil-filled submarine cable outside the PE layer without damaging the armored layer. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the illustrative embodiments of the present application and their descriptions, and do not constitute improper limitations to the present application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings needed in the embodiment description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and other accompanying drawings can be obtained by those skilled in the art without creative labor.

[0024] In addition, the drawings are not drawn to scale 1:1, and the relative sizes of the various elements are only exemplarily drawn in the drawings, but not necessarily drawn according to the true scale. In the drawings:

[0025] FIG. 1 is a structural schematic view of an oil-filled submarine cable according to an embodiment.

[0026] FIG. 2 is a structural schematic view of an oil-filled submarine cable plugging and repairing device according to an embodiment.

[0027] FIG. 3 is a sectional view of an oil-filled submarine cable plugging and repairing device according to an embodiment.

[0028] Explanation of reference signs:

[0029] 10, oil filled cable; 11, oil duct; 12, conductor layer; 13, insulation layer; 14, lead sheath; 15, first non-woven fabric layer; 16, PE layer; 17, second non-woven fabric layer; 18, armor layer; 21, main housing; 211, first half housing; 212, second half housing; 213, oil leakage area; 214, first sealing area; 215, second sealing area; 22, sealing assembly; 221, sealing strip; 222, annular sealing gasket; 23, oil discharge valve; 24, first connecting flange; 251, glue injection valve; 252, glue discharge valve; 30, splicing housing; 31, second connecting flange; 32, third connecting flange; 33, third sealing area; 40, conical sealing ring. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and that the present application is not limited to the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0033] In the present application, unless specifically defined otherwise, if there are terms such as "mount", "connect", "connect", "fix" and the like, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless specifically defined otherwise, if there are similar descriptions such as "first feature on" or "second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] It should be noted that if an element is referred to as "fixed to" or "provided to" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not the only embodiment.

[0036] As described above, the conventional plugging and repairing method for the subsea oil and gas pipeline is not ideal for the plugging and repairing of the oil-filled submarine cable 10. The inventors have found through extensive research that the reason is that the structure of the oil-filled submarine cable 10 is very different from that of the subsea oil and gas pipeline. Specifically, referring to FIG. 1, the through-slot oil-filled submarine cable 10 includes an oil channel 11, a conductor layer 12, an insulation layer 13, a lead sheath 14, a first non-woven fabric layer 15, a PE layer 16, a second non-woven fabric layer 17, an armor layer 18 and an outer sheath (not shown) which are sequentially sleeved from inside to outside. The gap between the armor layer 18, the PE layer 16 and the outer sheath is large, and the armor layer 18 is a cylindrical structure composed of a plurality of copper strips arranged closely in the circumferential direction, and there are also axial gaps between the copper strips. Thus, when the oil-filled submarine cable 10 is damaged and the insulating oil inside the oil channel 11 leaks to the outside of the oil-filled submarine cable 10, the insulating oil can leak axially between the armor layer 18, the PE layer 16 and the outer sheath, and between the copper strip gaps of the armor layer 18.

[0037] The current plugging repair method cannot plug the gap between the armor layer 18, the PE layer 16 and the outer protective layer, cannot solve the axial leakage problem of the oil-filled submarine cable 10, and can only damage the submarine cable armor layer 18 to plug from the surface of the submarine cable PE layer 16 to achieve plugging. After the submarine cable armor layer 18 is damaged, the oil-filled submarine cable 10 loses the ability to withstand tensile load. Considering the actual working condition of the oil-filled submarine cable 10, the axial load of the oil-filled submarine cable 10 is inevitable. Therefore, it is urgent to research an effective method for plugging the oil leakage of the oil-filled submarine cable 10 to solve the axial leakage problem of the oil-filled submarine cable 10 without damaging the submarine cable armor layer 18.

[0038] Based on this, an embodiment of the present application provides an oil-filled submarine cable plugging and repairing device. Specifically, referring to FIGS. 2 and 3, the oil-filled submarine cable plugging and repairing device of an embodiment includes a main shell 21 and a sealing assembly 22. The main shell 21 is used to be sleeved on the segment of the oil-filled submarine cable 10 where the leakage point is located. The sealing assembly 22 is arranged in the main shell 21. The sealing assembly 22 is used to divide the space between the main shell 21 and the oil-filled submarine cable 10 into an oil leakage area 213 corresponding to the leakage point, at least one first sealing area 214 located on one side of the oil leakage area 213, and at least one second sealing area 215 located on the other side of the oil leakage area 213 along the axial direction of the main shell 21. The oil leakage area 213 is communicated with an oil discharge valve 23. The first sealing area 214 and the second sealing area 215 are filled with sealing glue.

[0039] Specifically, when the oil-filled submarine cable plugging and repairing device is used, the outer protective layer of the segment of the oil-filled submarine cable 10 where the leakage point is located is peeled off to expose the armor layer 18. Then the main shell 21 is sleeved outside the armor layer 18 of the segment of the oil-filled submarine cable 10 where the leakage point is located. The leakage point of the oil-filled submarine cable 10 is locked in the oil leakage area 213 of the main shell 21. Then the oil discharge valve 23 is opened. The first sealing area 214 and the second sealing area 215 are filled with sealing glue at a certain pressure. The sealing glue can penetrate to the outside of the PE layer 16 along the copper strip gap of the armor layer 18 and the gap between the armor layer 18 and the PE layer 16. After the sealing glue is cured, the oil discharge valve 23 is closed, and the plugging and repairing of the oil-filled submarine cable 10 is completed.

[0040] The space between the main shell 21 and the oil-filled submarine cable 10 is divided into a leakage oil area 213 and first and second sealing areas 214 and 215 on both sides of the leakage oil area 213 by the sealing assembly 22. The leaked insulation oil can be discharged from the leakage oil area 213 through the oil discharge valve 23, thereby greatly reducing the possibility of leakage of the insulation oil to the first and second sealing areas 214 and 215, preventing the glue in the first and second sealing areas 214 and 215 from being washed away by the oil, and ensuring the stability of the glue filling process to the first and second sealing areas 214 and 215. Therefore, the glue filling can be performed synchronously during the oil discharge, and the efficiency of the plugging repair is improved. Meanwhile, the sealing glue is filled into the first and second sealing areas 214 and 215 at a certain pressure, and the sealing glue can penetrate to the outside of the PE layer 16 along the copper strip gap of the armored layer 18 and the gap between the armored layer 18 and the PE layer 16 under pressure to fill the copper strip gap of the armored layer 18 and the gap between the armored layer 18 and the PE layer 16, thereby avoiding the possibility of axial leakage of the insulation oil along the copper strip gap of the armored layer 18 and the gap between the armored layer 18 and the PE layer 16, and achieving the leakage plugging of the part of the oil-filled submarine cable 10 outside the PE layer 16 without damaging the armored layer 18.

[0041] Referring to FIG. 2, in an embodiment, the main shell 21 includes a first half shell 211 and a second half shell 212, which are connected to each other and jointly form a cylindrical structure. Specifically, during installation, the first and second half shells 211 and 212 are sleeved on the leakage point segment of the oil-filled submarine cable 10 in opposition. Then, the first and second half shells 211 and 212 are locked, and the installation of the main shell 21 is completed, without the need to cut off the oil-filled submarine cable 10 or sleeve the main shell 21 into the end part of the oil-filled submarine cable 10, and the operation is more simple and convenient. Exemplarily, the first and second half shells 211 and 212 can be locked by bolts.

[0042] Optionally, referring to FIG. 3, in an embodiment, the sealing assembly 22 comprises a sealing strip 221 and at least two annular sealing pads 222, the sealing strip 221 is arranged in the joint gap between the first half shell 211 and the second half shell 212, thereby sealing the joint gap between the first half shell 211 and the second half shell 212, preventing the insulating oil or sealing glue from leaking therefrom. Further, all the annular sealing pads 222 are arranged axially along the main housing 21 between the main housing 21 and the oil-filled submarine cable 10 and sealingly cooperate with the main housing 21 and the oil-filled submarine cable 10, so as to divide the space between the main housing 21 and the oil-filled submarine cable 10 into the oil leakage area 213, the first sealing area 214 and the second sealing area 215. Exemplarily, in the present embodiment, the annular sealing pads 222 are provided in four, which divide the space between the main housing 21 and the oil-filled submarine cable 10 into one oil leakage area 213, one first sealing area 214 on one side of the oil leakage area 213 and one second sealing area 215 on the other side of the oil leakage area 213. Understandably, in other embodiments, the number of annular sealing pads 222 can be more, thereby dividing more sealing areas between the main housing 21 and the oil-filled submarine cable 10 and improving the sealing effect.

[0043] Optionally, in an embodiment, the inner wall of the main housing 21 is provided with at least two sealing ring grooves (not shown), all the sealing ring grooves are arranged axially along the main housing 21, and the annular sealing pads 222 are correspondingly embedded in the sealing ring grooves. In this way, the annular sealing pads 222 can be axially limited, and meanwhile the sealing effect between the annular sealing pads 222 and the inner wall of the main housing 21 can be improved.

[0044] Referring to FIG. 2, in an embodiment, the oil leakage area 213 is communicated with two oil discharge valves 23, and the two oil discharge valves 23 are arranged oppositely along the radial direction of the main housing 21. When discharging oil, the lower oil discharge valve 23 is opened, and since the density of the insulating oil is smaller than that of seawater, the insulating oil and seawater can be discharged at the same time. Exemplarily, one of the oil discharge valves 23 is installed on the first half shell 211, and the other oil discharge valve 23 is installed on the second half shell 212, so that when installed, it is not necessary to distinguish which one of the first half shell 211 and the second half shell 212 is upper and which one is lower, and it is more convenient for quick installation.

[0045] Continuing to refer to FIG. 2, in an embodiment, the first sealing area 214 and the second sealing area 215 are each provided with a glue injection valve 251 and a glue discharge valve 252, and the glue injection valve 251 and the glue discharge valve 252 are arranged opposite to each other in the radial direction of the main shell 21, and the glue injection valve 251 is below the glue discharge valve 252. Specifically, when injecting glue, the glue injection system is connected to the glue injection valve 251, and then the glue injection valve 251 and the glue discharge valve 252 are opened to start injecting glue. Since the density of the sealing glue is greater than the density of seawater, when the glue evenly flows out of the glue discharge valve 252 located above, it indicates that the sealing area is filled with sealing glue, which ensures the accuracy of the amount of glue injected.

[0046] Referring to FIG. 3, optionally, in an embodiment, if the sealing effect of the main shell 21 is not good and axial leakage occurs, a continuation shell 30 can be added to the main shell 21. Specifically, in an embodiment, the two ends of the main shell 21 are each provided with a first connecting flange 24 for connecting with the continuation shell 30. The continuation shell 30 is used to be sleeved on the oil-filled submarine cable 10, and the space between the continuation shell 30 and the oil-filled submarine cable 10 forms a sealed third sealing area 33. Exemplarily, the continuation shell 30 is also provided with a sealing assembly, and the sealing assembly forms the third sealing area 33 between the continuation shell 30 and the oil-filled submarine cable 10. Each continuation shell 30 also includes two half shells, so that the continuation shell 30 is installed.

[0047] Further, the third sealing area 33 is filled with sealing glue. By adding the continuation shell 30 to the end of the main shell 21, the third sealing area 33 in the axial direction of the main shell 21 is increased, and by injecting sealing glue into the third sealing area 33, the effect of axial sealing is enhanced, and axial leakage is avoided. Further, the third sealing area 33 of each continuation shell 30 is also communicated with a glue injection valve and a glue discharge valve, so that the third sealing area 33 of the continuation shell 30 is injected with glue.

[0048] Exemplarily, in an embodiment, one continuation shell 30 is connected to each end of the main shell 21, so that one third sealing area 33 is formed at each end of the main shell 21, further improving the sealing effect. Understandably, in theory, the number of continuation shells 30 can be increased infinitely according to needs, improving the expandability of the oil-filled submarine cable plugging and repairing device.

[0049] Specifically, the two ends of the continuation shell 30 are respectively provided with a second connecting flange 31 and a third connecting flange 32. The second connecting flange 31 is used to connect with the first connecting flange 24, and the third connecting flange 32 is used to connect with the second connecting flange 31 of another continuation shell 30. In this way, it is possible to continue to add continuation shells 30 at the end of the continuation shell 30 away from the main shell 21.

[0050] Optionally, in an embodiment, the first connecting flange 24 is provided with a threaded through hole (not shown) for threading a threaded connecting member, and the second connecting flange 31 and the third connecting flange 32 are each provided with a waist-shaped hole (not shown) for threading a threaded connecting member. Specifically, when connecting the adapter housing 30 to the main housing 21, the waist-shaped hole of the second connecting flange 31 and the threaded through hole of the first connecting flange 24 are aligned, and then a threaded connecting member is threaded to achieve the connection of the adapter housing 30 and the main housing 21. Similarly, when connecting two adapter housings 30, the waist-shaped hole of the third connecting flange 32 of the adapter housing 30 and the waist-shaped hole of the second connecting flange 31 of the other adapter housing 30 are aligned, and then a threaded connecting member is threaded to achieve the connection and fixation of the two adapter housings 30. At the same time, by providing the waist-shaped hole, the operability of the hole-to-hole alignment is increased, and installation is more convenient.

[0051] Further, the end face of the first connecting flange 24 and the end face of the third connecting flange 32 are each provided with a tapered groove, and the end face of the second connecting flange 31 is provided with a cylindrical groove. The main housing 21 and the adapter housing 30 are provided with a tapered sealing ring 40. Specifically, one end of the tapered sealing ring 40 is in a tapered structure to form a small-diameter end, and the other end is in a cylindrical structure to form a large-diameter end. Further, when the first connecting flange 24 of the main housing 21 and the second connecting flange 31 of the adapter housing 30 are connected, or when the second connecting flange 31 of the adapter housing 30 and the third connecting flange 32 of the other adapter housing 30 are connected, the small-diameter end of the tapered sealing ring 40 between them is embedded in the tapered groove, and the large-diameter end of the tapered sealing ring 40 is embedded in the cylindrical groove. In this way, the tapered sealing ring 40 can be compressed in the axial direction, on the one hand, further enhancing the axial sealing performance of the oil-filled submarine cable plugging and repairing device. On the other hand, after the tapered sealing ring 40 is extruded, it has a certain tightness on the armor layer 18, which can tighten the armor layer 18, reduce the gap on the armor layer 18, and further prevent axial leakage.

[0052] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not conflict, they should be considered within the scope of the present disclosure.

[0053] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An oil-filled submarine cable plugging repair device, characterized by The utility model relates to a kind of oil-filled cable leak sealing device, including: Main shell, the main shell is used to set in the segment of the leak point of oil-filled cable; And Sealing assembly, the sealing assembly is arranged in the main shell, the sealing assembly is used to divide the space between the main shell and the oil-filled cable into oil leakage area corresponding to the leak point, at least one first sealing area located on one side of the oil leakage area and at least one second sealing area located on the other side of the oil leakage area along the axial direction of the main shell;Wherein the oil leakage area is communicated with oil drain valve, the first sealing area and the second sealing area are filled with sealant.

2. An oil-filled cable plug repair device according to claim 1, characterised in that, The main shell includes first half shell and second half shell, and the first half shell and the second half shell are connected and jointly enclosed to form a cylindrical structure.

3. An oil-filled cable plug and repair device according to claim 2, characterised in that, The sealing assembly includes a sealing strip and at least two annular sealing pads, the sealing strip is arranged in the joint gap of the first half shell and the second half shell, and all the annular sealing pads are arranged between the main shell and the oil-filled cable along the axial direction of the main shell and are sealingly connected with the main shell and the oil-filled cable to divide the space between the main shell and the oil-filled cable into the oil leakage area, the first sealing area and the second sealing area.

4. An oil-filled cable plug and repair device according to claim 3, characterised in that, The inner wall of the main shell is provided with at least two sealing ring grooves, and each sealing ring groove is arranged along the axial direction of the main shell, and the annular sealing pad is correspondingly embedded in the sealing ring groove.

5. An oil-filled cable plug repair device according to claim 1, characterised in that, The oil leakage area is communicated with two oil drain valves, and the two oil drain valves are arranged opposite along the radial direction of the main shell.

6. An oil-filled cable plug repair device according to claim 1, characterised in that, The first sealing area and the second sealing area are communicated with glue injection valve and glue discharge valve, and the glue injection valve and the glue discharge valve are arranged opposite along the radial direction of the main shell, and the glue injection valve is located below the glue discharge valve.

7. An oil-filled cable plug repair device according to claim 1, characterised in that Both ends of the main shell are provided with first connecting flanges, the first connecting flanges are used to connect with connecting shells, the connecting shells are used to set on the oil-filled cable, a sealed third sealing area is formed in the space between the connecting shell and the oil-filled cable, and the third sealing area is filled with the sealant.

8. An oil-filled cable plug and repair device according to claim 7, characterised in that, Both ends of the connecting shell are respectively provided with second connecting flanges and third connecting flanges, the second connecting flanges are used to connect with the first connecting flanges, and the third connecting flanges are used to connect with the second connecting flanges of another connecting shell.

9. An oil-filled cable plug and repair device according to claim 8, characterised in that, The first connecting flange is provided with a threaded through hole for penetrating a threaded connecting piece, and the second connecting flange and the third connecting flange are both provided with a waist-shaped hole for penetrating a threaded connecting piece.

10. An oil-filled cable plug repair device according to claim 8, characterised in that, The end face of the first connecting flange and the end face of the third connecting flange are both provided with a tapered groove, and the end face of the second connecting flange is provided with a cylindrical groove. The tapered sealing ring is arranged between the main shell and the connecting shell, and the tapered sealing ring is also arranged between adjacent connecting shells. The small-diameter end of the tapered sealing ring is embedded in the tapered groove, and the large-diameter end of the tapered sealing ring is embedded in the cylindrical groove.

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