Submarine cable sealing device

Abstract

The application provides a submarine cable sealing device, which comprises a sealing box, a first sealing element and a second sealing element. The sealing box comprises a first box body and a second box body which are detachably connected to each other. In the first direction, one side of the second box body is sealingly connected to the first box body, the other side of the second box body is used for connecting a structure to be threaded, and the side of the first box body away from the second box body is used for facing seawater. The sealing box is provided with a threading hole which penetrates the first box body and the second box body in the first direction, and the threading hole is used for threading the submarine cable. One end of the submarine cable can extend into the structure to be threaded. The first box body is provided with a first sealing cavity, the second box body is provided with a second sealing cavity, and the sealing box is provided with a communication cavity which communicates the first sealing cavity and the second sealing cavity. The first sealing element is arranged in the first sealing cavity and surrounds the outer periphery of the submarine cable. The second sealing element is arranged in the second sealing cavity and surrounds the outer periphery of the submarine cable. The second sealing element at least partially extends into the communication cavity and abuts against the first sealing element.

Description

Technical Field

[0001] This application relates to the field of submarine cable technology, and in particular to a submarine cable sealing device. Background Technology

[0002] When submarine cables are connected to seabed space stations and other electrical equipment used on the seabed, sealing devices need to be installed at the interface between the submarine cable and the seabed space station or electrical equipment. If the sealing ring of the sealing device fails, the sealing device will not work properly, causing seawater to enter the seabed space station or electrical equipment and affecting its normal use. Summary of the Invention

[0003] This application provides a submarine cable sealing device to solve the problem that the failure of the sealing ring of existing sealing devices leads to seawater entering the seabed space station or electrical equipment and affecting its normal use.

[0004] This application provides a submarine cable sealing device, including a sealing box, a first sealing element, and a second sealing element. The sealing box includes a first box body and a second box body detachably connected to each other. Along a first direction, one side of the second box body is sealed to the first box body, and the other side of the second box body is used to connect to the structure to be cabled. The side of the first box body away from the second box body faces the seawater. The sealing box has a cable-passing hole that passes through the first box body and the second box body along the first direction. The cable-passing hole allows the submarine cable to pass through, and one end of the submarine cable can extend into the structure to be cabled. The first box body has a first sealing cavity, and the second box body has a second sealing cavity. The sealing box has a connecting cavity that connects the first sealing cavity and the second sealing cavity. The first sealing element is disposed in the first sealing cavity and surrounds the outer periphery of the submarine cable. The second sealing element is disposed in the second sealing cavity and surrounds the outer periphery of the submarine cable. The second sealing element at least partially extends into the connecting cavity and abuts against the first sealing element.

[0005] In one possible implementation, along the first direction, the first seal has a first extension protruding on the side near the second seal, and the second seal has a second extension protruding on the side near the first seal. Both the first extension and the second extension extend into the communicating cavity and abut against each other.

[0006] In one possible implementation, along the first direction, the first extension is provided with a limiting groove on the side near the second extension, and the second extension is provided with a limiting part protruding on the side near the first extension, the limiting part being engaged in the limiting groove.

[0007] In one possible implementation, the submarine cable sealing device further includes an elastic element located within the second sealing cavity, the elastic element elastically abutting against the second sealing element to press the second extension against the first extension.

[0008] In one possible implementation, along the first direction, the cavity wall of the second sealing cavity on the side away from the first sealing cavity is provided with a mounting cavity, the elastic member is at least partially located in the mounting cavity, one end of the elastic member is elastically connected to the bottom wall of the mounting cavity, and the other end of the elastic member elastically abuts against the second sealing member.

[0009] In one possible implementation, along the first direction, the wall of the second sealing cavity on the side away from the first sealing cavity is provided with a conical cavity, and the second sealing member on the side away from the first sealing member is provided with a conical portion, the conical portion being able to be accommodated in the conical cavity and abut against the wall of the conical cavity.

[0010] In one possible implementation, when the limiting part is located within the limiting groove, the tapered part is spaced apart from the cavity wall of the tapered cavity; when the tapered part abuts against the cavity wall of the tapered cavity, the limiting part moves away from the limiting groove.

[0011] In one possible implementation, along the first direction, the first box body is provided with a first sealing sub-cavity on the side near the second box body, and the second box body is provided with a second sealing sub-cavity on the side near the first box body. The first sealing sub-cavity communicates with the second sealing sub-cavity and forms a third sealing cavity. The third sealing cavity is arranged around the communicating cavity, and the submarine cable sealing device further includes a third sealing element located inside the third sealing cavity.

[0012] In one possible implementation, the outer peripheral surface of the first seal is provided with a plurality of first outer sealing protrusions, and the inner peripheral surface of the first seal is provided with a plurality of first inner sealing protrusions.

[0013] In one possible implementation, the outer peripheral surface of the second seal is provided with a plurality of second outer sealing protrusions, and the inner peripheral surface of the second seal is provided with a plurality of second inner sealing protrusions.

[0014] The submarine cable sealing device of this application comprises a first housing and a second housing. A first seal is housed within the first housing, and a second seal is housed within the second housing. When the first seal, located on the outer side, fails due to prolonged exposure to seawater pressure or other factors, seawater flows from the gap between the submarine cable and the first seal into the connecting cavity. However, the second seal prevents seawater from penetrating the cable into the structure to be cabled, thus avoiding water ingress into the structure due to the failure of the first seal. Furthermore, the second housing is detachably connected to the first housing. This allows the first housing and its internal first seal to be replaced if the first seal fails and begins to prevent seawater penetration, ensuring that the newly replaced first seal continues to withstand seawater pressure. This extends the lifespan of the second seal and enables its long-term use as a backup sealing structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the submarine cable sealing device of this application in one embodiment.

[0016] Figure 2 This is a partially enlarged schematic diagram of the submarine cable sealing device of this application.

[0017] Figure 3 This is a schematic diagram of the structure of the first housing of the submarine cable sealing device in one embodiment of this application.

[0018] Key component symbols: 100, submarine cable sealing device; X, first direction; P1, first conical surface; P2, second conical surface; 10, sealing box; 11, first box body; 111, first sealing cavity; 112, first connecting part; 1120, first connecting hole; 12, second box body; 121, second sealing cavity; 122, mounting cavity; 123, limiting cavity; 124, second connecting part; 1240, second connecting hole; 125, conical cavity; 13, threading hole; 14, communicating cavity; 141, first sub-cavity; 142, second sub-cavity. Cavity; 15, Third sealing cavity; 151, First sealing sub-cavity; 152, Second sealing sub-cavity; 20, First sealing element; 21, First extension; 210, Limiting groove; 22, First outer sealing protrusion; 23, First inner sealing protrusion; 30, Second sealing element; 31, Second extension; 310, Limiting part; 32, Second outer sealing protrusion; 33, Second inner sealing protrusion; 34, Conical part; 35, Limiting protrusion; 40, Submarine cable; 50, Structure to be inserted; 60, Elastic element; 70, Third sealing element; 80, Fastener.

[0019] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0020] The following description will refer to the accompanying drawings to provide a more complete picture of the present application. The drawings illustrate exemplary embodiments of the present application. However, the present application may be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. The same reference numerals denote the same or similar components.

[0021] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to limit the application. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to also include the plural forms. Furthermore, when used herein, “comprising” and / or “including” and / or “having,” integers, steps, operations, components, and / or components, but does not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components, and / or groups thereof.

[0022] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Furthermore, unless expressly defined herein, terms such as those defined in a general dictionary should be interpreted as having the same meaning as they have in the relevant art and in the content of this application, and will not be interpreted as having an idealized or overly formal meaning.

[0023] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0024] like Figures 1 to 2 As shown, this embodiment provides a submarine cable sealing device 100, including a sealing box 10, a first sealing element 20 and a second sealing element 30.

[0025] The sealing box 10 includes a first box body 11 and a second box body 12 that are detachably connected to each other, so as to facilitate separation of the first box body 11 and the second box body 12. The sealing box 10 is provided with a threading hole 13, which passes through the first box body 11 and the second box body 12 along a first direction X. The threading hole 13 is for the submarine cable 40 to pass through, and the first direction X is parallel to the direction of the axis of the submarine cable 40 passing through the threading hole 13. The shape and size of the threading hole 13 are the same as those of the submarine cable 40, so that the submarine cable 40 passes exactly through the threading hole 13.

[0026] Along the first direction X, one side of the second housing 12 is sealed to the first housing 11, meaning a sealing structure is provided at the connection between the first housing 11 and the second housing 12 to prevent seawater from entering the cable hole 13 from the connection between the first housing 11 and the second housing 12. Along the first direction X, the other side of the second housing 12 is connected to the cable-carrying structure 50, allowing the second housing 12 and the cable-carrying structure 50 to be integrally formed, thus eliminating the need for a sealing structure at the connection between the second housing 12 and the cable-carrying structure 50. Furthermore, along the first direction X, the side of the first housing 11 away from the second housing 12 faces the seawater, so that when seawater flows along the outer surface of the submarine cable 40 towards the cable-carrying structure 50, it first flows through the first housing 11. One end of the submarine cable 40 can extend into the cable-carrying structure 50. The cable-to-be-entered structure 50 can be a submarine space station or other underwater equipment. The submarine cable 40 passes through the sealed box 10 and then enters the cable-to-be-entered structure 50, which can prevent seawater from entering the cable-to-be-entered structure 50 along the outer surface of the cable 40.

[0027] The first housing 11 has a first sealing cavity 111, and the second housing 12 has a second sealing cavity 121. Both the first sealing cavity 111 and the second sealing cavity 121 are connected to the cable threading hole 13. The sealing box 10 has a connecting cavity 14, which is located between the first sealing cavity 111 and the second sealing cavity 121, and connects the first sealing cavity 111 and the second sealing cavity 121. The first sealing element 20 is disposed in the first sealing cavity 111 and surrounds the outer periphery of the submarine cable 40. The second sealing element 30 is disposed in the second sealing cavity 121 and surrounds the outer periphery of the submarine cable 40. The second sealing element 30 is disposed on the side of the first sealing element 20 away from the cable entry structure 50, so that the first sealing element 20 acts as the main sealing element to prevent seawater from entering the cable entry structure 50, while the second sealing element 30 acts as a secondary sealing element to prevent seawater from entering the cable entry structure 50 after the first sealing element 20 fails. In addition, the second seal 30 extends at least partially into the communicating cavity 14 and abuts against the first seal 20, so that the first seal 20 is supported by the second seal 30. This allows the second seal 30 to abut against the portion of the first seal 20 that corresponds to the communicating cavity 14, preventing this portion from being easily deformed by long-term water pressure.

[0028] Thus, the submarine cable sealing device 100 of this application, by setting a first housing 11 and a second housing 12, with a first sealing element 20 installed in the first housing 11 and a second sealing element 30 installed in the second housing 12, when the first sealing element 20 located on the outside fails due to long-term seawater pressure or other factors, seawater flows from the gap between the submarine cable 40 and the first sealing element 20 to the connecting cavity 14. However, the second sealing element 30 prevents seawater from penetrating along the submarine cable 40 into the structure 50 to be cabled, thereby avoiding water ingress into the structure 50 to be cabled due to the failure of the first sealing element 20. At the same time, the second housing 12 is detachably connected to the first housing 11, so that when the first sealing element 20 fails and the second sealing element 30 begins to prevent seawater penetration, the first housing 11 can be removed and the first housing 11 and the first sealing element 20 inside can be replaced, and the newly replaced first sealing element 20 can continue to withstand the seawater pressure, thereby improving the lifespan of the second sealing element 30 and enabling it to be used as a backup sealing structure for a long time.

[0029] Please combine Figures 1 to 3 In one embodiment, the first box 11 is generally a hollow cylindrical structure, the second box 12 is also generally a hollow cylindrical structure, and the first box 11 and the second box 12 have the same size.

[0030] The first sealing cavity 111 is located within the first housing 11, and its cross-sectional shape is circular. Along the first direction X, the width of the first sealing cavity 111 is less than the width of the first housing 11. The width of the first sealing member 20 is the same as the width of the first sealing cavity 111, and the first sealing member 20 is interference-fitted into the first sealing cavity 111. The cross-sectional shape of the wire hole 13 is also circular, and the wire hole 13 is coaxially arranged with the first sealing cavity 111. The diameter of the wire hole 13 is smaller than the inner diameter of the first sealing cavity 111. The first sealing member 20 is approximately a ring structure and is made of an elastic material such as rubber, for example, a special rubber suitable for deep-sea environments.

[0031] The second sealing cavity 121 is located within the second housing 12, and the cross-sectional shape of the second sealing cavity 121 is circular. Along the first direction X, the width of the second sealing cavity 121 is less than the width of the second housing 12. The wire hole 13 is coaxially arranged with the second sealing cavity 121, and the diameter of the wire hole 13 is smaller than the inner diameter of the second sealing cavity 121. The second sealing element 30 is approximately an annular structure, and the material used for the second sealing element 30 is the same as that used for the first sealing element 20.

[0032] In this embodiment, the outer peripheral surface of the first sealing member 20 is provided with a plurality of first outer sealing protrusions 22, and the inner peripheral surface of the first sealing member 20 is provided with a plurality of first inner sealing protrusions 23. Along the first direction X, the plurality of first outer sealing protrusions 22 are spaced apart, and the plurality of first inner sealing protrusions 23 are also spaced apart. Both the plurality of first outer sealing protrusions 22 and the plurality of first inner sealing protrusions 23 are integrally formed with the first sealing member 20 and are made of the same material. The plurality of first outer sealing protrusions 22 abut against the cavity wall of the first sealing cavity 111, and the plurality of first inner sealing protrusions 23 abut against the outer peripheral surface of the submarine cable 40. The plurality of first outer sealing protrusions 22 and the plurality of first inner sealing protrusions 23 have stronger deformation capabilities. On the one hand, they are pre-compressed more tightly during installation; on the other hand, when subjected to the water pressure of seawater, the first inner sealing protrusions 23 compress the submarine cable 40 to a greater degree, thereby improving the water-resistant capability of the entire first sealing member 20.

[0033] It is understood that in other embodiments, the first seal 20 may not have the first outer sealing protrusion 22 and the first inner sealing protrusion 23, but may directly have the outer peripheral surface of the first seal 20 abut against the cavity wall of the first sealing cavity 111, and the inner peripheral surface of the first seal 20 abut against the outer peripheral surface of the submarine cable 40, thereby increasing the resistance to axial sliding of the first seal 20.

[0034] In one possible implementation, the outer peripheral surface of the second sealing member 30 is provided with a plurality of second outer sealing protrusions 32, and the inner peripheral surface of the second sealing member 30 is provided with a plurality of second inner sealing protrusions 33. Along the first direction X, the plurality of second outer sealing protrusions 32 are spaced apart, and the plurality of second inner sealing protrusions 33 are also spaced apart. Both the plurality of second outer sealing protrusions 32 and the plurality of second inner sealing protrusions 33 are integrally formed with the second sealing member 30 and are made of the same material. The plurality of second outer sealing protrusions 32 abut against the cavity wall of the second sealing cavity 121, and the plurality of second inner sealing protrusions 33 abut against the outer peripheral surface of the submarine cable 40. The plurality of second outer sealing protrusions 32 and the plurality of second inner sealing protrusions 33 have stronger deformation capabilities. On the one hand, they are pre-compressed more tightly during installation; on the other hand, when subjected to the water pressure of seawater, the second inner sealing protrusions 33 compress the submarine cable 40 to a greater degree, thereby improving the overall water-resistant capability of the second sealing member 30. Furthermore, the arrangement of multiple second outer sealing protrusions 32 and multiple second inner sealing protrusions 33 can reduce the resistance to axial sliding of the second seal 30, thereby allowing the second seal 30 to be moved axially under seawater pressure until it is compressed.

[0035] In this embodiment, the cross-sectional shape of the connecting cavity 14 is circular, and the connecting cavity 14 is coaxially arranged with the wire hole 13. The inner diameter of the connecting cavity 14 is larger than the diameter of the wire hole 13, and the inner diameter of the connecting cavity 14 is smaller than the inner diameter of the first sealing cavity 111 and the second sealing cavity 121.

[0036] The connecting cavity 14 includes a first sub-cavity 141 and a second sub-cavity 142. Along the first direction X, the first sub-cavity 141 extends from the side of the first housing 11 near the second housing 12 toward the side away from the second housing 12 to connect with the first sealing cavity 111, and the second sub-cavity 142 extends from the side of the second housing 12 near the first housing 11 toward the side away from the first housing 11 to connect with the second sealing cavity 121, thereby enabling the first sealing cavity 111 to communicate with the second sealing cavity 121 through the connecting cavity 14.

[0037] In this embodiment, along the first direction X, the first sealing member 20 has a first extension 21 protruding on the side near the second sealing member 30. The first extension 21 is made of the same material as the first sealing member 20. The first extension 21 is generally annular in structure, and is coaxial with the first sealing member 20 and integrally formed. Along the first direction X, the length of the first extension 21 is the same as the length of the first sub-cavity 141, and the outer peripheral surface of the first extension 21 abuts against the cavity wall of the first sub-cavity 141.

[0038] Along the first direction X, the second seal 30 has a protruding second extension 31 on the side near the first seal 20. The second extension 31 is made of the same material as the second seal 30. The second extension 31 is generally annular in structure and is coaxial with and integrally formed with the second seal 30. Along the first direction X, the length of the second extension 31 is the same as the length of the second sub-cavity 142, and the outer peripheral surface of the second extension 31 abuts against the cavity wall of the second sub-cavity 142.

[0039] Specifically, a first inner sealing protrusion 23 may also be provided on the inner circumferential surface of the first extension 21, and a second inner sealing protrusion 33 may also be provided on the inner circumferential surface of the second extension 31. The first inner sealing protrusion 23 and the second inner sealing protrusion 33 abut against the outer circumferential surface of the submarine cable 40. Alternatively, the inner circumferential surfaces of the first extension 21 and the second extension 31 may directly abut against the outer circumferential surface of the submarine cable 40.

[0040] In this embodiment, both the first extension 21 and the second extension 31 extend into the communicating cavity 14 and abut against each other. Along the first direction X, the first extension 21 has a limiting groove 210 on the side near the second extension 31. The limiting groove 210 has an annular cross-sectional shape and surrounds the wire hole 13. The second extension 31 has a protruding limiting part 310 on the side near the first extension 21. The limiting part 310 has an annular structure, and its shape and size are adapted to the limiting groove 210. The limiting part 310 is held in the limiting groove 210. The end of the limiting part 310 away from the second extension 31 abuts against the bottom wall of the limiting groove 210. The limiting part 310 provides axial support to the first sealing member 20 to avoid deformation of the first extension 21 under water pressure. The outer peripheral surface of the limiting part 310 abuts against the inner peripheral surface of the limiting groove 210 to achieve radial limiting of the first extension 21. Thus, the first sealing member 20 is axially and radially limited to ensure sealing effect.

[0041] Please combine Figures 1 to 3 In one embodiment, the submarine cable sealing device 100 further includes an elastic member 60, which is located in the second sealing cavity 121 and elastically abuts against the second sealing member 30 to make the second extension 31 press against the first extension 21.

[0042] The elastic element 60 is at least partially located within the mounting cavity 122. One end of the elastic element 60 is elastically connected to the bottom wall of the mounting cavity 122, and the other end of the elastic element 60 elastically abuts against the second seal 30.

[0043] Specifically, along the first direction X, the cavity wall of the second sealing cavity 121 on the side away from the first sealing cavity 111 is provided with a mounting cavity 122. The mounting cavity 122 extends from the cavity wall of the second sealing cavity 121 on the side away from the first sealing cavity 111 toward the side of the structure to be fed into the cable 50. The elastic element 60 can be an elastic element such as a spring, and the elastic element 60 is provided along the first direction X. The length of the elastic element 60 in the first direction X is less than the length of the mounting cavity 122, so that part of the elastic element 60 can be located outside the mounting cavity 122 and abut against the second sealing element 30, thereby pushing the second sealing element 30 to move along the first direction X toward the side of the first sealing element 20.

[0044] In addition, the number of mounting cavities 122 is set to be multiple, and the multiple mounting cavities 122 are equally spaced around the axis of the second box 12, and each mounting cavity 122 is provided with an elastic element 60 to ensure the stability of the support.

[0045] Specifically, when the end of the limiting part 310 away from the second extension 31 abuts against the bottom wall of the limiting groove 210, the second sealing member 30 abuts against the cavity wall of the second sealing cavity 121 on the side close to the first sealing cavity 111.

[0046] In this embodiment, along the first direction X, a limiting cavity 123 is provided on the cavity wall of the second sealing cavity 121 near the first sealing cavity 111. The limiting cavity 123 has an annular cross-sectional shape and is located on the outer periphery of the second sub-cavity 142. Along the first direction X, a limiting protrusion 35 is provided on the side of the second sealing member 30 near the first sealing member 20. The limiting protrusion 35 is made of the same material as the second sealing member 30. The limiting protrusion 35 has an annular structure, and its shape and size are adapted to the limiting cavity 123 so that it is housed within the limiting cavity 123. Thus, when the second sealing member 30 abuts against the first sealing member 20, the cavity wall of the limiting cavity 123 abuts against the outer peripheral surface of the limiting protrusion 35, thereby limiting the limiting protrusion 35 and thus limiting the second sealing member 30, ensuring the stability of the support.

[0047] Please combine Figures 1 to 3 In one embodiment, along the first direction X, a conical cavity 125 is provided on the side of the second sealing cavity 121 away from the first sealing cavity 111, and the conical cavity 125 is coaxially arranged with the second sealing cavity 121. Along the first direction X, a conical portion 34 is provided on the side of the second sealing member 30 away from the first sealing member 20, and the conical portion 34 is coaxially arranged with the second sealing member 30, and the inner diameter of the conical portion 34 is the same as the inner diameter of the second sealing member 30. The conical portion 34 and the second sealing member 30 are integrally formed and made of the same material. The conical portion 34 can be accommodated within the conical cavity 125 and abut against the cavity wall of the conical cavity 125. Furthermore, a second inner sealing protrusion 33 may be provided on the inner circumferential surface of the conical portion 34.

[0048] The outer peripheral surface of the conical portion 34 is designated as a first conical surface P1, and the cavity wall of the conical cavity 125 is designated as a second conical surface P2. Both the first conical surface P1 and the second conical surface P2 are conical surfaces and can be considered as the outer peripheral surfaces of a frustum structure. Along the first direction X, the outer diameter of the end of the first conical surface P1 closest to the wire-feeding structure 50 is smaller than the outer diameter of the end of the first conical surface P1 furthest from the wire-feeding structure 50. The shapes of the first conical surface P1 and the second conical surface P2 are matched so that the first conical surface P1 can fit against the second conical surface P2. Furthermore, the conical surface design of the first conical surface P1 and the second conical surface P2 allows the second sealing element 30 to press against the second conical surface P2 under seawater pressure. As the seawater pressure increases, the second sealing element 30 presses against the second conical surface P2 more tightly, thus achieving a tightening effect under increasing pressure and ensuring sealing performance.

[0049] In this embodiment, when the limiting part 310 is located within the limiting groove 210, the conical part 34 is spaced apart from the cavity wall of the conical cavity 125. At this time, the end of the limiting part 310 away from the second extension 31 abuts against the bottom wall of the limiting groove 210, and the first conical surface P1 and the second conical surface P2 are spaced apart, thereby allowing the second sealing member 30 to have space to move toward the side of the second conical surface P2.

[0050] When the conical portion 34 abuts against the cavity wall of the conical cavity 125, that is, when the first conical surface P1 abuts against the second conical surface P2, the limiting portion 310 leaves the limiting groove 210, thereby releasing the limiting effect of the limiting portion 310 on the first sealing member 20, allowing the first sealing member 20 to be separated from the second sealing member 30, and then the first housing 11 and the first sealing member 20 inside it can be completely removed and replaced. During the replacement of the first housing 11 and the first sealing member 20 inside it, the second sealing member 30 performs a sealing function.

[0051] Thus, when the first seal 20 fails, seawater flows over it and towards the second seal 30, pushing it towards the second conical surface P2 until it abuts against it. During this process, the second extension 31 remains within the second sub-cavity 142, and its outer peripheral surface abuts against the wall of the second sub-cavity 142, preventing seawater from entering the space between the second seal 30 and the wall of the second sealing cavity 121 near the first sealing cavity 111. Simultaneously, the limiting protrusion 35 also moves within the limiting cavity 123, further preventing seawater from entering the space between the second seal 30 and the wall of the second sealing cavity 121 near the first sealing cavity 111.

[0052] When the first housing 11 and its internal first seal 20 are replaced, the second seal 30 is pulled outward until it abuts against the cavity wall of the second sealing cavity 121 on the side away from the structure 50 to be connected, thus preventing seawater residue. Then, the limiting part 310 is aligned with the limiting groove 210, and the first housing 11 and the second housing 12 are connected. The first seal 20 continues to provide a seal while withstanding seawater pressure, while the second seal 30 is no longer subjected to seawater pressure.

[0053] It is worth noting that when replacing or maintaining the first housing 11, a temporary watertight compartment can be used to seal the entire submarine cable sealing device 100 to provide a waterless working environment.

[0054] Please combine Figures 1 to 3 In one embodiment, along the first direction X, the first box 11 is provided with a first sealing sub-cavity 151 on the side near the second box 12, and the second box 12 is provided with a second sealing sub-cavity 152 on the side near the first box 11. The first sealing sub-cavity 151 communicates with the second sealing sub-cavity 152 and forms a third sealing cavity 15.

[0055] The first sealing sub-cavity 151 has an annular cross-sectional shape and is arranged around the first sub-cavity 141. The second sealing sub-cavity 152 has an annular cross-sectional shape and is arranged around the second sub-cavity 142. The first sealing sub-cavity 151 and the second sealing sub-cavity 152 have the same shape and size, so that when the first housing 11 and the second housing 12 are connected, the first sealing sub-cavity 151 and the second sealing sub-cavity 152 communicate and together form a sealed third sealing cavity 15, and the third sealing cavity 15 is arranged around the communicating cavity 14.

[0056] In this embodiment, the submarine cable sealing device 100 further includes a third sealing element 70, which is located within the third sealing cavity 15. The third sealing element 70 is generally annular in structure and is made of an elastic material such as rubber, for example, a high-performance rubber suitable for underwater sealing, such as a special rubber. The third sealing element 70 is interference-fitted into the third sealing cavity 15 to prevent seawater from entering the communicating cavity 14 from the mating surface between the first housing 11 and the second housing 12.

[0057] In this embodiment, a first connecting portion 112 protrudes from the outer peripheral surface of the first box body 11, and the first connecting portion 112 surrounds the outer peripheral surface of the first box body 11. A second connecting portion 124 protrudes from the outer peripheral surface of the second box body 12, and the second connecting portion 124 surrounds the outer peripheral surface of the second box body 12.

[0058] Along the first direction X, the surface of the first connecting portion 112 near the second housing 12 is coplanar with the surface of the first housing 11 near the second housing 12, and the surface of the second connecting portion 124 near the first housing 11 is coplanar with the surface of the second housing 12 near the first housing 11, so that the first connecting portion 112 and the second connecting portion 124 fit together when the first housing 11 and the second housing 12 are assembled. The first connecting portion 112 is provided with a first connecting hole 1120, which penetrates the first connecting portion 112 along the first direction X. The second connecting portion 124 is provided with a second connecting hole 1240, which penetrates the second connecting portion 124 along the first direction X.

[0059] The first connecting hole 1120 communicates with the second connecting hole 1240. The submarine cable sealing device 100 also includes a fastener 80, which passes through the first connecting hole 1120 and the second connecting hole 1240, thereby connecting the first connecting part 112 and the second connecting part 124 through the fastener 80. The fastener 80 can be a bolt or other connecting element.

[0060] Specifically, there are multiple first connecting holes 1120, which are evenly distributed around the axis of the first housing 11. Correspondingly, there are also multiple second connecting holes 1240, which correspond one-to-one with the multiple first connecting holes 1120.

[0061] The specific embodiments of this application have been described above with reference to the accompanying drawings. However, those skilled in the art will understand that various changes and substitutions can be made to the specific embodiments of this application without departing from the scope of this application. All such changes and substitutions fall within the scope defined by this application.

Claims

1. A sealing device for submarine cables, characterized in that, include: A sealed box includes a first box body and a second box body that are detachably connected to each other. Along a first direction, one side of the second box body is sealed to the first box body, and the other side of the second box body is used to connect to the structure to be cabled. The side of the first box body away from the second box body is facing the seawater. The sealed box is provided with a cable-passing hole. Along the first direction, the cable-passing hole passes through the first box body and the second box body. The cable-passing hole is for passing through a submarine cable, and one end of the submarine cable can extend into the structure to be cabled. The first box contains a first sealed cavity, the second box contains a second sealed cavity, and the sealed box contains a communicating cavity that connects the first sealed cavity and the second sealed cavity. A first sealing element is disposed within the first sealing cavity and surrounds the outer periphery of the submarine cable; A second seal is disposed within the second sealing cavity and surrounds the outer periphery of the submarine cable. The second seal extends at least partially into the communicating cavity and abuts against the first seal.

2. The submarine cable sealing device as described in claim 1, characterized in that, Along the first direction, the first seal has a first extension protruding on the side near the second seal, and the second seal has a second extension protruding on the side near the first seal. Both the first extension and the second extension extend into the communicating cavity and abut against each other.

3. The submarine cable sealing device as described in claim 2, characterized in that, Along the first direction, the first extension is provided with a limiting groove on the side near the second extension, and the second extension is provided with a limiting part protruding on the side near the first extension, and the limiting part is engaged in the limiting groove.

4. The submarine cable sealing device as described in claim 3, characterized in that, The submarine cable sealing device further includes an elastic element located within the second sealing cavity, which elastically abuts against the second sealing element to press the second extension against the first extension.

5. The submarine cable sealing device as described in claim 4, characterized in that, Along the first direction, the cavity wall of the second sealing cavity on the side away from the first sealing cavity is provided with an installation cavity, the elastic element is at least partially located in the installation cavity, one end of the elastic element is elastically connected to the bottom wall of the installation cavity, and the other end of the elastic element elastically abuts against the second sealing element.

6. The submarine cable sealing device as described in claim 3, characterized in that, Along the first direction, the wall of the second sealing cavity on the side away from the first sealing cavity is provided with a conical cavity, and the second sealing member on the side away from the first sealing member is provided with a conical portion, which can be accommodated in the conical cavity and abut against the wall of the conical cavity.

7. The submarine cable sealing device as described in claim 6, characterized in that, When the limiting part is located within the limiting groove, the conical part is spaced apart from the cavity wall of the conical cavity; when the conical part abuts against the cavity wall of the conical cavity, the limiting part moves away from the limiting groove.

8. The submarine cable sealing device as described in claim 1, characterized in that, Along the first direction, the first box body is provided with a first sealing sub-cavity on the side near the second box body, and the second box body is provided with a second sealing sub-cavity on the side near the first box body. The first sealing sub-cavity communicates with the second sealing sub-cavity and forms a third sealing cavity. The third sealing cavity is arranged around the communicating cavity, and the submarine cable sealing device further includes a third sealing element located inside the third sealing cavity.

9. The submarine cable sealing device as described in claim 1, characterized in that, The outer peripheral surface of the first seal is provided with a plurality of first outer sealing protrusions, and the inner peripheral surface of the first seal is provided with a plurality of first inner sealing protrusions.

10. The submarine cable sealing device as described in claim 1, characterized in that, The outer peripheral surface of the second seal is provided with a plurality of second outer sealing protrusions, and the inner peripheral surface of the second seal is provided with a plurality of second inner sealing protrusions.

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