Oil-filled submarine cable plugging and repair device

Abstract

The present application relates to an oil-filled submarine cable plugging and repairing device. The oil-filled submarine cable plugging and repairing device comprises a main shell and a sealing assembly, wherein the main shell is used to be mounted on the section of the oil-filled submarine cable where the leakage point is located. The sealing assembly is arranged in the main shell, and the sealing assembly is used to axially separate the space between the main shell and the oil-filled submarine cable into an oil leakage area corresponding to the leakage 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, wherein the oil leakage area is connected to an oil drain valve, and the first sealing area and the second sealing area are both filled with sealant. The above-mentioned oil-filled submarine cable plugging and repairing device can achieve the purpose of plugging the leakage of the oil-filled submarine cable without damaging the armor layer.

Description

Technical Field

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

[0002] Oil-filled submarine cables are submarine cables that use insulating oil as a pressurized fluid, allowing the oil to flow freely within the cable. Damage to an oil-filled cable can cause leakage, contaminating the seawater and impacting the stable operation of the power grid.

[0003] Currently, there are several methods for repairing oil-filled submarine cables, including splicing repair, water-blocking repair, and plugging repair. Among them, plugging repair is to form a physical blockage on the outside of the damaged point without repairing the main body. Plugging repair has the technical advantages of being simple, fast, and low-cost.

[0004] Currently, the plugging and repair methods for oil-filled submarine cables mostly refer to the plugging and repair methods for submarine oil and gas pipelines. However, the traditional plugging and repair methods for submarine oil and gas pipelines are not ideal for the plugging and repair of oil-filled submarine cables. Summary of the Invention

[0005] Based on this, it is necessary to provide an oil-filled submarine cable sealing and repairing device to improve the sealing and repairing effect of oil-filled submarine cable leakage.

[0006] An oil-filled submarine cable plugging and repairing device, comprising:

[0007] A main shell, the main shell being used to be mounted on the section of the oil-filled submarine cable where the leakage point is located; and

[0008] A sealing assembly is disposed in the main housing, and is used to separate the space between the main housing and the oil-filled submarine cable along the axial direction of the main housing into an oil leakage area corresponding to the leakage 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, wherein the oil leakage area is connected to an oil drain valve, and the first sealing area and the second sealing area are both filled with sealant.

[0009] The technical solution is further described below:

[0010] In one embodiment, the main shell includes 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 together form a cylindrical structure.

[0011] In one embodiment, the sealing assembly includes a sealing strip and at least two annular sealing gaskets, wherein the sealing strip is arranged in the joint gap between the first half shell and the second half shell, and all the annular sealing gaskets are arranged at intervals along the axial direction of the main shell between the main shell and the oil-filled submarine cable and are sealed with the main shell and the oil-filled submarine cable to separate the space between the main shell and the oil-filled submarine cable to form the oil leakage area, the first sealing area and the second sealing area.

[0012] In one embodiment, the inner wall of the main housing is provided with at least two sealing ring grooves, each of the sealing ring grooves is spaced apart along the axial direction of the main housing, and the annular sealing gaskets are embedded in the sealing ring grooves one by one.

[0013] In one embodiment, the oil drain area is connected to two oil drain valves, and the two oil drain valves are arranged opposite to each other along the radial direction of the main housing.

[0014] In one embodiment, the first sealing area and the second sealing area are both connected to a glue injection valve and a glue discharge valve, and the glue injection valve and the glue discharge valve are arranged opposite to each other along the radial direction of the main shell, and the glue injection valve is located below the glue discharge valve.

[0015] In one embodiment, both ends of the main shell are provided with a first connecting flange, the first connecting flange is used to be connected to the connecting shell, the connecting shell is used to be mounted on the oil-filled submarine cable, and the space between the connecting shell and the oil-filled submarine cable forms a sealed third sealing area, and the third sealing area is filled with the sealant.

[0016] In one embodiment, a second connecting flange and a third connecting flange are respectively provided at both ends of the connection housing. The second connecting flange is used to connect to the first connecting flange, and the third connecting flange is used to connect to the second connecting flange of another connection housing.

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

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

[0019] A conical sealing ring is provided between the main housing and the connection housing; and / or a conical sealing ring is provided between two adjacent connection housings;

[0020] 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.

[0021] In the aforementioned oil-filled submarine cable plugging and repair device, a sealing assembly divides the space between the main housing and the oil-filled submarine cable into an oil drain zone and a first sealing zone and a second sealing zone, located on either side of the oil drain zone. Leaked insulating oil is then drained from the oil drain zone via an oil drain valve, significantly reducing the likelihood of insulating oil seeping into the first and second sealing zones. This prevents the glue in the first and second sealing zones from being washed away by the oil, ensuring the stability of the glue filling process in the first and second sealing zones. This allows glue filling to proceed simultaneously with oil draining, improving the efficiency of the plugging and repair process. At the same time, by filling sealant into the first sealing area and the second sealing area with a certain pressure, the sealant can penetrate into the outside of the PE layer along the copper strip gaps in the armor layer and the gaps between the armor layer and the PE layer under pressure to fill the copper strip gaps in the armor layer and the gaps between the armor layer and the PE layer, thereby avoiding the possibility of axial leakage of insulating oil along the copper strip gaps in the armor layer and the gaps between the armor layer and the PE layer, thereby achieving leakage sealing of the oil-filled submarine cable outside the PE layer without damaging the armor layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only for illustrative purposes and are not necessarily drawn to true scale.

[0025] Figure 1 Schematic diagram of the structure of an oil-filled submarine cable according to one embodiment.

[0026] Figure 2 The figure is a schematic structural diagram of an oil-filled submarine cable plugging and repairing device according to one embodiment.

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

[0028] Description of reference numerals:

[0029] 10. Oil-filled submarine cable; 11. Oil channel; 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 shell; 211. First half shell; 212. Second half shell; 213. Oil drain area; 214. First sealing area; 215. Second sealing area; 22. Sealing assembly; 221. Sealing strip; 222. Ring-shaped sealing gasket; 23. Oil drain valve; 24. First connecting flange; 251. Glue injection valve; 252. Glue discharge valve; 30. Connection shell; 31. Second connecting flange; 32. Third connecting flange; 33. Third sealing area; 40. Conical sealing ring. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0031] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0033] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0034] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0036] As mentioned above, the traditional plugging and repairing method for submarine oil and gas pipelines is not ideal for plugging and repairing the oil-filled submarine cable 10. After extensive research, the inventors found that the reason is that the structure of the oil-filled submarine cable 10 is very different from that of the submarine oil and gas pipeline. Figure 1 The through-groove oil-filled submarine cable 10 includes, from the inside out, an oil channel 11, a conductor layer 12, an insulating 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). The gaps between the armor layer 18, the PE layer 16, and the outer sheath are relatively large. The armor layer 18 is a cylindrical structure composed of multiple copper bars tightly arranged circumferentially, with axial gaps between the copper bars. Therefore, if the oil-filled submarine cable 10 is damaged and the insulating oil inside the oil channel 11 leaks outside the cable 10, the insulating oil can leak axially between the armor layer 18, the PE layer 16, and the outer sheath, as well as between the copper bars in the armor layer 18.

[0037] The current plugging and repair method cannot seal the gaps between the armor layer 18, PE layer 16, and outer sheath, and cannot solve the axial leakage problem of the oil-filled submarine cable 10. To achieve plugging, the submarine cable armor layer 18 can only be destroyed and plugged from the surface of the submarine cable PE layer 16. Once the submarine cable armor layer 18 is damaged, the oil-filled submarine cable 10 will lose its ability to withstand tensile loads. Considering the actual working conditions of the oil-filled submarine cable 10, the axial load of the oil-filled submarine cable 10 is inevitable. Therefore, it is urgent to develop a method for effectively sealing the insulating oil leakage of the oil-filled submarine cable 10, so as 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, see Figure 2 as well as Figure 3 An oil-filled submarine cable plugging and repairing device according to one embodiment includes a main housing 21 and a sealing assembly 22. The main housing 21 is configured to be mounted on the leaking section of the oil-filled submarine cable 10. The sealing assembly 22 is disposed within the main housing 21 and is configured to separate the space between the main housing 21 and the oil-filled submarine cable 10 along the axial direction of the main housing 21 into an oil drain area 213 corresponding to the leaking section, at least one first sealing area 214 located on one side of the oil drain area 213, and at least one second sealing area 215 located on the other side of the oil drain area 213. The oil drain area 213 is connected to an oil drain valve 23, and both the first sealing area 214 and the second sealing area 215 are filled with sealant.

[0039] Specifically, when using the oil-filled submarine cable sealing and repairing device, the outer sheath of the section where the leak is located in the oil-filled submarine cable 10 is first peeled off to expose the armor layer 18. The main housing 21 is then placed over the armor layer 18 of the section where the leak is located in the oil-filled submarine cable 10, and the leak of the oil-filled submarine cable 10 is sealed within the oil drain area 213 of the main housing 21. The oil drain valve 23 is then opened. Sealant is then filled into the first sealing area 214 and the second sealing area 215 at a certain pressure. The sealant can penetrate into the outer side of the PE layer 16 along the gaps between the copper bars of the armor layer 18 and the gap between the armor layer 18 and the PE layer 16. After the sealant solidifies, the oil drain valve 23 is closed to complete the sealing and repair of the leak in the oil-filled submarine cable 10.

[0040] In the above-mentioned oil-filled submarine cable plugging and repairing device, the sealing assembly 22 separates the space between the main housing 21 and the oil-filled submarine cable 10 into an oil drain area 213 and a first sealing area 214 and a second sealing area 215, respectively located on either side of the oil drain area 213. The leaked insulating oil is then discharged from the oil drain area 213 via the oil drain valve 23, thereby greatly reducing the possibility of insulating oil leaking into the first sealing area 214 and the second sealing area 215. This prevents the glue in the first and second sealing areas 214, 215 from being washed away by the oil, ensuring the stability of the glue filling process in the first and second sealing areas 214, 215. Therefore, glue filling can be carried out simultaneously with the oil draining process, improving the efficiency of the plugging and repair. At the same time, by filling the first sealing area 214 and the second sealing area 215 with a certain pressure, the sealant can penetrate into the outside of the PE layer 16 along the copper strip gaps of the armor layer 18 and the gap between the armor layer 18 and the PE layer 16 under pressure to fill the copper strip gaps of the armor layer 18 and the gap between the armor layer 18 and the PE layer 16, thereby avoiding the possibility of axial leakage of insulating oil along the copper strip gaps of the armor layer 18 and the gap between the armor layer 18 and the PE layer 16, thereby achieving leakage sealing of the part outside the PE layer 16 of the oil-filled submarine cable 10 without damaging the armor layer 18.

[0041] See also Figure 2 In one embodiment, the main housing 21 includes a first half-shell 211 and a second half-shell 212. The first half-shell 211 and the second half-shell 212 are connected to each other and together enclose a cylindrical structure. Specifically, during installation, the first half-shell 211 and the second half-shell 212 are placed relative to each other over the section of the oil-filled submarine cable 10 where the leak is located. The first half-shell 211 and the second half-shell 212 are then tightened together to complete the installation of the main housing 21. This eliminates the need to cut the oil-filled submarine cable 10 or insert the main housing 21 from the end of the oil-filled submarine cable 10, making the operation simpler and more convenient. For example, the first half-shell 211 and the second half-shell 212 can be tightened by bolts.

[0042] Alternatively, see Figure 3In one embodiment, the sealing assembly 22 includes a sealing strip 221 and at least two annular sealing gaskets 222. The sealing strip 221 is disposed in the joint gap between the first and second half shells 211, 212, thereby sealing the joint gap and preventing leakage of insulating oil or sealant therefrom. Furthermore, all annular sealing gaskets 222 are spaced apart along the axial direction of the main housing 21 between the main housing 21 and the oil-filled submarine cable 10 and sealably engage with the main housing 21 and the oil-filled submarine cable 10 to separate the space between the main housing 21 and the oil-filled submarine cable 10 into an oil drain zone 213, a first sealing zone 214, and a second sealing zone 215. For example, in this embodiment, four annular sealing gaskets 222 are provided, separating the space between the main housing 21 and the oil-filled submarine cable 10 into an oil drain zone 213, a first sealing zone 214 located on one side of the oil drain zone 213, and a second sealing zone 215 located on the other side of the oil drain zone 213. It is understandable that in other embodiments, the number of the annular sealing gaskets 222 can be greater, thereby separating more sealing areas between the main housing 21 and the oil-filled submarine cable 10 and improving the sealing effect.

[0043] Optionally, in one embodiment, the inner wall of the main housing 21 is provided with at least two sealing ring grooves (not shown). These grooves are spaced apart axially along the main housing 21, and the annular sealing gaskets 222 are embedded in each of the grooves. This provides axial positioning of the annular sealing gaskets 222 and enhances the sealing effect between the annular sealing gaskets 222 and the inner wall of the main housing 21.

[0044] See also Figure 2 In one embodiment, the oil drain area 213 is connected to two oil drain valves 23, which are arranged radially opposite each other along the main housing 21. To drain the oil, the lower drain valve 23 is opened. Since the density of insulating oil is lower than that of seawater, the seawater can be drained simultaneously with the insulating oil. For example, one drain valve 23 is installed on the first half-shell 211, and the other is installed on the second half-shell 212. This eliminates the need to distinguish which is on top, the first half-shell 211 or the second half-shell 212, during installation, facilitating quick installation.

[0045] Continue to see Figure 2In one embodiment, both the first sealing area 214 and the second sealing area 215 are equipped with a glue injection valve 251 and a glue discharge valve 252. The glue injection valve 251 and the glue discharge valve 252 are arranged radially opposite each other in the main housing 21, with the glue injection valve 251 located below the glue discharge valve 252. Specifically, during glue injection, the glue injection system glue injection valve 251 is connected, and then the glue injection valve 251 and the glue discharge valve 252 are opened to start glue injection. Because the density of sealant is greater than that of seawater, when the glue discharge valve 252 located above evenly discharges glue, it means that the sealing area is fully filled with sealant, ensuring the accuracy of the glue injection amount.

[0046] See also Figure 3 Optionally, in one embodiment, if the sealing effect of the main housing 21 is poor and axial leakage still occurs, a splicing housing 30 can be expanded on the main housing 21. Specifically, in one embodiment, both ends of the main housing 21 are provided with a first connecting flange 24, which is used to connect to the splicing housing 30. The splicing housing 30 is used to be mounted on the oil-filled submarine cable 10. The space between the splicing housing 30 and the oil-filled submarine cable 10 forms a sealed third sealing area 33. Exemplarily, the splicing housing 30 is also provided with a sealing assembly, which forms the third sealing area 33 between the splicing housing 30 and the oil-filled submarine cable 10. Each splicing housing 30 also includes two half shells to facilitate the installation of the splicing housing 30.

[0047] Furthermore, the third sealing area 33 is filled with sealant. By adding the connection housing 30 to the end of the main housing 21, the third sealing area 33 is added axially to the main housing 21. Injecting sealant into the third sealing area 33 enhances the axial sealing effect and prevents axial leakage. Furthermore, the third sealing area 33 of each connection housing 30 is connected to a sealant injection valve and a sealant discharge valve, facilitating the injection of sealant into the third sealing area 33 of the connection housing 30.

[0048] For example, in one embodiment, a splice housing 30 is connected to each end of the main housing 21. This creates a third sealing area 33 at each end of the main housing 21, further enhancing the sealing effect. It is understood that the number of splice housings 30 can theoretically be increased as needed, increasing the scalability of the oil-filled submarine cable plugging and repair device.

[0049] Specifically, a second connecting flange 31 and a third connecting flange 32 are respectively provided at both ends of the connection housing 30. The second connecting flange 31 is used to connect to the first connecting flange 24, and the third connecting flange 32 is used to connect to the second connecting flange 31 of another connection housing 30. In this way, it is possible to further add connection housings 30 at the end of the connection housing 30 away from the main housing 21.

[0050] Optionally, in one embodiment, the first connecting flange 24 is provided with a threaded through-hole (not shown) for receiving a threaded connector, and the second and third connecting flanges 31 and 32 are each provided with a waist-shaped hole (not shown) for receiving a threaded connector. Specifically, when connecting the connection housing 30 to the main housing 21, the waist-shaped hole of the second connecting flange 31 can be aligned with the threaded through-hole of the first connecting flange 24, and the threaded connector can be inserted to connect the connection housing 30 to the main housing 21. Similarly, when connecting two connection housings 30, the waist-shaped hole of the third connecting flange 32 of one connection housing 30 can be aligned with the waist-shaped hole of the second connecting flange 31 of the other connection housing 30, and the threaded connector can be inserted to secure the two connection housings 30. The provision of waist-shaped holes also increases the operability of hole alignment, facilitating installation.

[0051] Furthermore, the end faces of the first connecting flange 24 and the third connecting flange 32 are each provided with a conical groove, and the end face of the second connecting flange 31 is provided with a cylindrical groove. A conical sealing ring 40 is provided between the main housing 21 and the connection housing 30. A conical sealing ring 40 is also provided between two adjacent connection housings 30. Specifically, one end of the conical sealing ring 40 has a conical structure to form a small-diameter end, and the other end has a cylindrical structure to form a large-diameter end. Furthermore, when the first connecting flange 24 of the main housing 21 is connected to the second connecting flange 31 of the connection housing 30, or when the second connecting flange 31 of the connection housing 30 is connected to the third connecting flange 32 of another connection housing 30, the small-diameter end of the conical sealing ring 40 between the two ends is embedded in the conical groove, and the large-diameter end of the conical sealing ring 40 is embedded in the cylindrical groove. This allows the conical sealing ring 40 to be axially compressed, further enhancing the axial sealing performance of the oil-filled submarine cable plugging and repair device. On the other hand, after being squeezed, the conical sealing ring 40 exerts a certain tightening force 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-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An oil-filled submarine cable plugging and repairing device, characterized in that: include: A main shell, the main shell being used to be sleeved on the section of the oil-filled submarine cable where the leakage point is located; as well as A sealing assembly is disposed in the main housing, and is used to separate the space between the main housing and the oil-filled submarine cable along the axial direction of the main housing into an oil leakage area corresponding to the leakage 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; wherein the oil leakage area is connected to an oil drain valve, and the first sealing area and the second sealing area are both filled with sealant.

2. The oil-filled submarine cable plugging and repairing device according to claim 1, characterized in that: The main shell includes 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 together enclose a cylindrical structure.

3. The oil-filled submarine cable plugging and repairing device according to claim 2, characterized in that: The sealing assembly includes a sealing strip and at least two annular sealing gaskets. The sealing strip is arranged in the splicing gap between the first half shell and the second half shell. All the annular sealing gaskets are arranged between the main shell and the oil-filled submarine cable at intervals along the axial direction of the main shell and are sealed with the main shell and the oil-filled submarine cable to separate the space between the main shell and the oil-filled submarine cable to form the oil leakage area, the first sealing area and the second sealing area.

4. The oil-filled submarine cable plugging and repairing device according to claim 3 is characterized in that: The inner wall of the main housing is provided with at least two sealing ring grooves, each of which is spaced apart along the axial direction of the main housing, and the annular sealing gaskets are embedded in the sealing ring grooves in a one-to-one correspondence.

5. The oil-filled submarine cable plugging and repairing device according to claim 1, characterized in that: The oil drain area is connected to the two oil drain valves, and the two oil drain valves are arranged opposite to each other along the radial direction of the main housing.

6. The oil-filled submarine cable plugging and repairing device according to claim 1, characterized in that: The first sealing area and the second sealing area are both connected with a glue injection valve and a glue discharge valve, and the glue injection valve and the glue discharge valve are arranged opposite to each other along the radial direction of the main shell, and the glue injection valve is located below the glue discharge valve.

7. The oil-filled submarine cable plugging and repairing device according to claim 1, characterized in that: Both ends of the main shell are provided with a first connecting flange, which is used to be connected to the connecting shell. The connecting shell is used to be mounted on the oil-filled submarine cable. The space between the connecting shell and the oil-filled submarine cable forms a sealed third sealing area, and the third sealing area is filled with the sealant.

8. The oil-filled submarine cable plugging and repairing device according to claim 7, characterized in that: A second connecting flange and a third connecting flange are respectively provided at both ends of the connection housing. The second connecting flange is used to connect with the first connecting flange, and the third connecting flange is used to connect with the second connecting flange of another connection housing.

9. The oil-filled submarine cable plugging and repairing device according to claim 8, characterized in that: The first connecting flange is provided with a threaded through hole for passing a threaded connecting piece, and the second connecting flange and the third connecting flange are both provided with a waist-shaped hole for passing a threaded connecting piece.

10. The oil-filled submarine cable plugging and repairing device according to claim 8, characterized in that: The end surface of the first connecting flange and the end surface of the third connecting flange are both provided with a tapered groove, and the end surface of the second connecting flange is provided with a cylindrical groove; A conical sealing ring is provided between the main shell and the connecting shell; and a conical sealing ring is also provided between two 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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