Sea optical cable bearing sealing device and sea optical cable

Abstract

The invention relates to the technical field of submarine cables, and provides a submarine cable force-bearing sealing device and a submarine cable, and the submarine cable comprises a stainless steel optical fiber unit, a non-metal rod, a steel wire and an insulating layer which are sequentially arranged from inside to outside. The sea optical cable force-bearing sealing device comprises an injection molding body and a force-bearing sealing assembly, the force-bearing sealing assembly defines a first fixing space, a second fixing space and a third fixing space, a stainless steel optical fiber unit is fixed in the first fixing space and extends out to be connected with external equipment, a non-metal rod is fixed in the second fixing space, and a steel wire is fixed in the third fixing space; the injection molding body is arranged at the end of the force bearing sealing assembly, and the inner wall face of the injection molding body covers part of the force bearing sealing assembly and part of the insulating layer. The sealing performance and the mechanical connectivity are good, and the use requirement can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine optical cables, and in particular to a submarine optical cable load-bearing sealing device and a submarine optical cable. Background Art

[0002] Traditional submarine optical cables are metal-armored and use steel wire as the load-bearing material. Due to the high density of steel wire, the submarine optical cable itself is heavy. Therefore, when the water depth exceeds 8000m, during the deployment and recovery process, the submarine optical cable is affected by its own gravity of 10,000 meters underwater length and the tensile load of the terminal equipment, resulting in a low safety load margin. If the submarine optical cable is to be deployed, recovered and used at a depth of 10,000 meters, its strength / weight ratio and working load margin must be comprehensively considered, and it must also have good water pressure resistance.

[0003] Lightweight and high-strength non-metallic rods (aramid rods, PBO non-metallic rods, etc., composed of aramid, PBO fiber filaments and a reinforcement layer formed by pouring and curing resin, with a density of ≤2.0g / cm 3 , breaking strength ≥1500MPa) has become an important load-bearing structural component of deep-sea optical cables. Submarine optical cables designed and manufactured using non-metallic rods as load-bearing elements have a high strength / weight ratio. If submarine optical cables are only armored with non-metallic rods, although their own weight is reduced, the problem of low safety factor when deployed and recovered at a depth of 10,000 meters is overcome, but their mechanical strength is relatively low. Under the impact of water flow, they cannot use their own weight to maintain a vertical shape. Their underwater dynamic shape and water pressure resistance are poor, and it is difficult to meet high-intensity application scenarios. Therefore, submarine optical cables require a new type of armored load-bearing structure that can reduce their own weight while ensuring their own mechanical strength to meet the application conditions under 10,000-meter water depth conditions.

[0004] At present, the load-bearing sealing components used to connect deep-sea optical cables to underwater terminal equipment are Ferrule-type clamp components for steel wire armor or are fixed by glue injection. There is currently no load-bearing sealing device for non-metallic armored submarine optical cables, which cannot meet the engineering application needs of new submarine optical cables. Summary of the invention

[0005] The present invention provides a submarine optical cable load-bearing sealing device and a submarine optical cable, which are used to solve the problem that the submarine optical cable load-bearing sealing device in the prior art cannot meet the use requirements.

[0006] The present invention provides a load-bearing sealing device for a submarine cable. The submarine cable comprises a stainless steel optical fiber unit, a non-metallic rod, a steel wire and an insulating layer which are arranged in sequence from the inside to the outside; the load-bearing sealing device for the submarine cable comprises an injection molded body and a load-bearing sealing component, the load-bearing sealing component defines a first fixed space, a second fixed space and a third fixed space, the stainless steel optical fiber unit is fixed in the first fixed space and extends out to be connected with external equipment, the non-metallic rod is fixed in the second fixed space, and the steel wire is fixed in the third fixed space; the injection molded body is arranged at the end of the load-bearing sealing component, and the inner wall surface of the injection molded body covers part of the load-bearing sealing component and part of the insulating layer.

[0007] According to a load-bearing sealing device for a submarine cable provided by the present invention, the load-bearing sealing assembly includes a first cone, a second cone and a third cone, the first cone is provided with the first fixed space; the second cone is provided at the outer periphery of the first cone, and the second fixed space is formed between the outer wall surface of the first cone and the inner wall surface of the second cone; the third cone is provided at the outer periphery of the second cone, and the third fixed space is formed between the outer wall surface of the second cone and the inner wall surface of the third cone.

[0008] According to a submarine cable load-bearing sealing device provided by the present invention, the second fixed space includes a first fixed section and a second fixed section, the first fixed section is located between two adjacent second fixed sections, and the cross-sectional area of ​​the second fixed section is larger than the cross-sectional area of ​​the first fixed section.

[0009] According to a submarine cable load-bearing sealing device provided by the present invention, the cross-sectional area of ​​the first fixed section gradually increases from the first end to the second end; the cross-sectional area of ​​the second fixed section first increases and then decreases; and both ends of the second fixed space are the second fixed sections.

[0010] According to a load-bearing sealing device for a submarine cable provided by the present invention, the load-bearing sealing assembly also includes a shell, the shell is arranged on the outer periphery of the third cone, and the inner wall surface of the shell abuts against the outer wall surface of the third cone; a sealing portion is provided at the end of the shell, and the inner wall surface of the sealing portion is in contact with the insulating layer; the injection molded body is provided with a first channel and a second channel, the diameter of the first channel is larger than the diameter of the second channel, the inner wall surface of the first channel is in contact with the outer wall surface of the sealing portion, the inner wall surface of the second channel is in contact with the outer wall surface of the insulating layer, and the end face of the sealing portion abuts against the end face of the second channel.

[0011] According to a submarine cable load-bearing sealing device provided by the present invention, the outer wall surface of the sealing portion and the inner wall surface of the first channel are both provided with a first groove.

[0012] According to a submarine cable load-bearing sealing device provided by the present invention, the inner wall surface of the second fixed space and the inner wall surface of the third fixed space are both provided with a second groove.

[0013] According to a submarine cable load-bearing sealing device provided by the present invention, the first cone includes a cone portion and a stop portion, the stop portion is arranged at the end of the cone portion, and the outer wall surface of the stop portion abuts against the inner wall surface of the shell.

[0014] A submarine cable load-bearing sealing device provided according to the present invention also includes an end cover, which is detachably connected to an end of the load-bearing sealing component away from the injection molded body; the end cover is provided with a through hole, and the stainless steel optical fiber unit passes through the through hole.

[0015] According to a load-bearing sealing device for a submarine cable provided by the present invention, the end cover includes a limiting portion and a fixing portion, the through hole is arranged on the limiting portion, the limiting portion abuts against the end of the load-bearing sealing assembly, the fixing portion has a first step surface and a second step surface, the first step surface is pressed on the limiting portion, the second step surface abuts against the end of the load-bearing sealing assembly, and the fixing portion is connected to the shell by fasteners that are sequentially penetrated through the fixing portion and the load-bearing sealing assembly.

[0016] The present invention also provides a submarine cable having a submarine cable load-bearing sealing device at a connection end, comprising the submarine cable load-bearing sealing device as described in any one of the above items.

[0017] The submarine cable load-bearing sealing device and the submarine cable provided by the present invention are achieved by fixing the stainless steel optical fiber unit in the first fixed space, and the end of the stainless steel optical fiber unit is extended to connect with external equipment; the non-metallic rod is fixed in the second fixed space, and the steel wire is fixed in the third fixed space, so as to realize the fixation and mechanical connection of the submarine cable; by arranging an injection molding body at the end of the load-bearing sealing component, the end of the load-bearing sealing component is sealed to prevent seawater from entering the load-bearing sealing component from the gap between the insulating layer and the load-bearing sealing component. The submarine cable of the embodiment of the present invention has a moderate strength / weight ratio and a large working load margin. The submarine cable load-bearing sealing device can be used in conjunction with hybrid armored submarine cable engineering applications, and has good sealing and mechanical connectivity, which can meet its use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1It is a schematic diagram of the cross-sectional structure of the submarine optical cable provided by the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the load-bearing sealing device for a submarine cable provided by the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the load-bearing sealing assembly provided by the present invention; Reference numerals: 10. Submarine cable; 11. Stainless steel optical fiber unit; 12. Non-metallic rod; 13. Steel wire; 14. Water blocking member; 15. Conductor; 16. Insulation layer; 20. load-bearing sealing assembly; 21. first cone; 211. cone portion; 212. stopper portion; 22. second cone; 23. third cone; 24. first fixed space; 25. second fixed space; 251. first fixed section; 252. second fixed section; 26. third fixed space; 27. housing; 28. sealing portion; 29. ​​second groove; 30. Injection molded body; 31. First groove; 40. End cover; 41. Limiting portion; 42. Fixing portion. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific processes and examples of materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0026] Combine the following Figure 1-Figure 3 The invention describes a submarine cable load-bearing sealing device and a submarine cable.

[0027] like Figure 1As shown, the submarine cable 10 in the embodiment of the present invention comprises a stainless steel optical fiber unit 11, a non-metallic rod 12, a steel wire 13, a water blocking member 14, a conductor 15 and an insulating layer 16 which are sequentially arranged from the inside to the outside. Specifically, the non-metallic rod 12 is arranged at the periphery of the stainless steel optical fiber unit 11, and the diameters of the non-metallic rod 12 can be the same or different, and the non-metallic rods 12 of unequal diameters are tightly twisted at the periphery of the stainless steel optical fiber unit 11 to prevent the non-metallic rod 12 from bending and breaking, and the non-metallic rod 12 is not pre-deformed, and the steel wire 13 is tightly twisted in the peripheral gap of the non-metallic rod 12, and the steel wire 13 is pre-formed. The non-metallic rod 12 and the steel wire 13 can adopt a mixed armoring forming process. The non-metallic rod 12 and the steel wire 13 have the same twisting direction and the same twisting pitch. The two layers of unequal diameter non-metallic rods 12 and steel wires 13 are tangent to each other and have unequal diameters. The armor coverage rate of each layer is ≥99%. The non-metallic rod 12 and the armored steel wire 13 are twisted and formed once to form a cage-like support structure, which improves the compressive support capacity and specific gravity of the submarine cable 10 and realizes bending protection. The water blocking member 14 is filled in the gap between the non-metallic rod 12 and the steel wire 13. The conductor 15 can be a copper conductor 15, and the copper conductor is coated around the load-bearing unit (non-metallic rod 12 and steel wire 13). The insulating layer 16 is coated on the outer wall of the conductor 15, and the insulating layer 16 can be a polyethylene insulating layer 16. The non-metallic rod 12, steel wire 13, water-blocking member 14 and conductor 15 together constitute the water-blocking and load-bearing structure of the submarine cable 10, forming good tensile and compressive mechanical properties while meeting the underwater strength / weight ratio and having a large working load margin.

[0028] The submarine cable 10 in the embodiment of the present invention adopts a mixed armor type of non-metallic rods 12 and steel wires 13, which meets the lightweight requirements, ensures the safety margin of the submarine cable 10 during the construction and application process, and can also meet the underwater mechanical strength / weight ratio, ensuring that the submarine cable 10 uses its own weight to maintain a vertical state under the impact of water flow, and improves the application depth of the submarine cable 10. In addition, the submarine cable 10 can also meet the requirements of mechanical properties such as compression resistance and tension resistance. In the full sea depth environment, when the submarine cable 10 is subjected to high water pressure or tension, the good tensile and tensile resistance ensures that it does not deform and fail.

[0029] The load-bearing sealing device for a submarine cable provided in an embodiment of the present invention comprises: an injection molded body 30 and a load-bearing sealing assembly 20, wherein the load-bearing sealing assembly 20 defines a first fixed space 24, a second fixed space 25 and a third fixed space 26, wherein the stainless steel optical fiber unit 11 is fixed in the first fixed space 24 and extends out to be connected to external equipment, the non-metallic rod 12 is fixed in the second fixed space 25, and the steel wire 13 is fixed in the third fixed space 26; an injection molded body 30 is also provided at the end of the load-bearing sealing assembly 20, and the inner wall surface of the injection molded body 30 covers part of the load-bearing sealing assembly 20 and part of the insulating layer 16.

[0030] When the submarine cable 10 needs to be connected to external equipment (such as terminal equipment), part of the submarine cable 10 is stripped to expose the stainless steel optical fiber unit 11, the non-metallic rod 12 and the steel wire 13. The stainless steel optical fiber unit 11 is fixed in the first fixed space 24, that is, the outer wall surface of the stainless steel optical fiber unit 11 is tightly fitted with the inner wall surface of the first fixed space 24, and the end of the stainless steel optical fiber unit 11 is extended to connect with the external equipment. The non-metallic rod 12 is fixed in the second fixed space 25, and the outer wall surface of the non-metallic rod 12 is tightly fitted with the inner wall surface of the second fixed space 25. The steel wire 13 is fixed in the third fixed space 26, and the steel wire 13 is tightly fitted with the third fixed space 26, and the steel wire 13 does not move in the third fixed space 26.

[0031] In an optional embodiment, the load-bearing sealing assembly 20 includes a first cylinder, a second cylinder and a third cylinder. A first fixed space 24 is provided at the center of the first cylinder, and the stainless steel optical fiber unit 11 is fixed in the first fixed space 24. The second cylinder is sleeved on the first cylinder, and a second fixed space 25 is formed between the second cylinder and the first fixed cylinder. The non-metallic rod 12 is fixed in the second fixed space 25, and the second cylinder and the first cylinder limit the movement of the non-metallic rod 12. The third cylinder is sleeved on the second cylinder, and a third fixed space 26 is formed between the outer wall surface of the second cylinder and the inner wall surface of the first cylinder. The steel wire 13 is fixed in the third fixed space 26, and the third cylinder and the second cylinder limit the movement of the steel wire 13.

[0032] Furthermore, the injection molding body 30 is arranged at the end of the load-bearing sealing component 20, and the injection molding body 30 is used to seal the load-bearing sealing component 20. Specifically, part of the inner wall surface of the injection molding body 30 is attached to the load-bearing sealing component 20, and another part of the inner wall surface of the injection molding body 30 is attached to the insulating layer 16 of the submarine cable 10, so as to prevent seawater from entering the load-bearing sealing component 20 from between the outer wall surface of the load-bearing sealing component 20 and the insulating layer 16, and the sealing performance is good.

[0033] The load-bearing sealing device for submarine optical cables provided in the embodiment of the present invention is implemented by fixing the stainless steel optical fiber unit 11 in the first fixed space 24, and the end of the stainless steel optical fiber unit 11 is extended to connect with external equipment; the non-metallic rod 12 is fixed in the second fixed space 25, and the steel wire 13 is fixed in the third fixed space 26, so as to realize the fixation and mechanical connection of the submarine optical cable 10; and the injection molding body 30 is provided at the end of the load-bearing sealing component 20 to seal the end of the load-bearing sealing component 20, so as to prevent seawater from entering the load-bearing sealing component 20 from the gap between the insulating layer 16 and the load-bearing sealing component 20. The submarine optical cable in the embodiment of the present invention has a moderate strength / weight ratio and a large working load margin. The load-bearing sealing device for submarine optical cables can be used in a matching hybrid armored submarine optical cable project, and has good sealing and mechanical connectivity, which can meet its use requirements.

[0034] like Figure 1As shown, the load-bearing sealing assembly 20 provided in the embodiment of the present invention includes a first cone 21, a second cone 22 and a third cone 23. The first cone 21 is provided with a first fixed space 24; the second cone 22 is arranged on the outer periphery of the first cone 21, and a second fixed space 25 is formed between the outer wall surface of the first cone 21 and the inner wall surface of the second cone 22; the third cone 23 is arranged on the outer periphery of the second cone 22, and a third fixed space 26 is formed between the outer wall surface of the second cone 22 and the inner wall surface of the third cone 23.

[0035] During the installation process, a first fixed space 24 is provided at the center of the first cone 21, such as a through hole, the size of which matches the size of the stainless steel optical fiber unit 11, and the stainless steel optical fiber unit 11 is fixed in the through hole. The end of the stainless steel optical fiber unit 11 can extend out of the through hole to connect with external equipment. The non-metallic rod 12 is spread out along the circumference of the first cone 21, and the second cone 22 is pressed on the outer wall surface of the first cone 21, so that the non-metallic rod 12 is fixed between the inner wall surface of the second cone 22 and the outer wall surface of the first cone 21, that is, fixed in the second fixed space 25, so as to achieve the fixation of the non-metallic rod 12. All the steel wires 13 are spread out and evenly distributed on the outer wall surface of the second cone 22, and the third cone 23 is pressed on the outer wall surface of the second cone 22, so that the steel wires 13 are fixed between the outer wall surface of the second cone 22 and the inner wall surface of the third cone 23, that is, fixed in the third fixed space 26, so as to achieve the fixation of the steel wires 13.

[0036] It should be noted that the structures of the first cone 21 , the second cone 22 and the third cone 23 are not specifically limited and can be set according to actual conditions, and can be used to fix the stripped non-metallic rod 12 and the steel wire 13 .

[0037] In the embodiment of the present invention, the second fixing space 25 includes a first fixing section 251 and a second fixing section 252 . The first fixing section 251 is located between two adjacent second fixing sections 252 . The cross-sectional area of ​​the second fixing section 252 is greater than that of the first fixing section 251 .

[0038] In a specific embodiment, the cross-sectional area of ​​the first fixing section 251 gradually increases from the first end to the second end, the cross-sectional area of ​​the second fixing section 252 increases first and then decreases, and both ends of the second fixing space 25 are the second fixing sections 252. Figure 3 As shown, the second fixing section 252 is located between two adjacent first fixing sections 251, and the cross-sectional area of ​​the second fixing section 252 gradually increases from the end close to the first fixing section 251 to the middle. The first fixing section 251 acts as a buckling and fastening ring to prevent the non-metallic rod 12 from slipping under force, and the second fixing section 252 can increase the contact area with the non-metallic rod 12 relative to the first fixing section 251 to prevent the non-metallic rod 12 from slipping.

[0039] Specifically, the outer wall surface of the first cone 21 is provided with a first protrusion and a first groove, and the inner wall surface of the second cone 22 is provided with a second protrusion and a second groove, the first protrusion is pressed on the second groove, and the second protrusion is pressed on the first groove. The bottom of the first groove and the bottom of the second groove are planes, and the first protrusion and the second protrusion are both arc surface structures.

[0040] In an optional embodiment, the cross-section of the first fixed segment 251 is circular, and the cross-sectional area of ​​the first fixed segment 251 in the extension direction is equal. The cross-section of the second fixed segment 252 is also circular, and the cross-sectional area of ​​the second fixed segment 252 in the extension direction is equal. The first fixed segment 251 is transitionally connected to the second fixed segment 252.

[0041] In another embodiment, the cross-sectional area of ​​the first fixed segment 251 is circular, and the cross-sectional area of ​​the first fixed segment 251 in the extension direction gradually increases; the cross-sectional area of ​​the second fixed segment 252 is also circular, and the cross-sectional area of ​​the second fixed segment 252 in the extension direction also gradually increases, wherein the minimum cross-sectional area of ​​the second fixed segment 252 is connected to the maximum cross-sectional area of ​​the first fixed segment 251.

[0042] In the embodiment of the present invention, the inner wall surface of the second fixed space 25 and the inner wall surface of the third fixed space 26 are both provided with a second groove 29. Figure 3 As shown, the outer wall surface of the first cone 21 and the inner wall surface of the second cone 22 are both provided with a second groove 29, which increases the friction between the outer wall surface of the first cone 21 and the inner wall surface of the second cone 22, that is, increases the friction between the non-metallic rod 12 and its contact surface, and prevents the non-metallic rod 12 from slipping under force. Specifically, the inner wall surface of the first fixing section 251 and the inner wall surface of the second fixing section 252 are both provided with a second groove 29, which further limits the position of the non-metallic rod 12.

[0043] The outer wall of the second cone 22 and the inner wall of the third cone 23 are also provided with second grooves 29 to increase the friction between the outer wall of the second cone 22 and the inner wall of the third cone 23, that is, to increase the friction between the steel wire 13 and the inner wall to prevent the steel wire 13 from slipping.

[0044] The bearing seal assembly 20 in the embodiment of the present invention further includes a housing 27, which is disposed on the outer periphery of the third cone 23, and the inner wall surface of the housing 27 abuts against the outer wall surface of the third cone 23, and is used to fix the third cone 23, the second cone 22 and the first cone 21 inside. Figure 2 As shown, a sealing portion 28 is provided at the end of the housing 27, and the inner wall surface of the sealing portion 28 is in contact with the insulating layer 16, and the sealing portion 28 is in close contact with the insulating layer 16 to prevent water from entering the interior of the housing 27. In one embodiment, a sealing member, such as a sealant, is provided between the sealing portion 28 and the insulating layer 16, and the sealing effect is good.

[0045] Furthermore, the injection molded body 30 is provided with a first channel and a second channel, the diameter of the first channel is larger than the diameter of the second channel, and a step surface is formed at the connection between the first channel and the second channel. The inner wall surface of the first channel is in contact with the outer wall surface of the sealing portion 28, the inner wall surface of the second channel is in contact with the outer wall surface of the insulating layer 16, and the end surface of the sealing portion 28 is in contact with the end surface of the second channel, that is, in contact with the step surface, which can not only limit the position of the sealing portion 28, but also strengthen the sealing, preventing seawater from entering the load-bearing sealing assembly 20 from the end of the sealing portion 28.

[0046] In order to strengthen the connection between the sealing part 28 and the injection molding body 30, the outer wall surface of the sealing part 28 and the inner wall surface of the first channel are both provided with a first groove 31. In one embodiment, the outer wall surface of the sealing part 28 is provided with a plurality of first limiting grooves, and a first limiting protrusion is formed between two adjacent first limiting grooves. The inner wall surface of the first channel is provided with a plurality of second limiting grooves, and a second limiting protrusion is formed between two adjacent second limiting grooves. The first limiting protrusion is embedded in the second limiting groove, and the second limiting protrusion is embedded in the first limiting groove. On the one hand, the contact area of ​​the sealing part 28 of the injection molding body 30 is increased, the tensile strength is improved, and the two are prevented from being separated by force. On the other hand, the polyethylene after injection molding forms a centripetal contraction pressure clamping and is tightly fitted on the groove and the shell through cooling, thereby improving the longitudinal watertightness.

[0047] The first cone 21 in the embodiment of the present invention includes a cone portion 211 and a stopper 212. The stopper 212 is provided at the end of the cone portion 211 away from the injection molded body 30. The cone portion 211 is used to fix the stainless steel optical fiber unit 11. The outer wall surface of the stopper 212 abuts against the inner wall surface of the housing 27, so that the cone portion 211, the second cone 22, and the third cone 23 are confined in the housing 27. It should be noted that a through hole is provided on the stopper 212 so that the stainless steel optical fiber unit 11 can extend out.

[0048] The submarine cable load-bearing sealing device in the embodiment of the present invention further includes an end cap 40, which is detachably connected to an end of the load-bearing sealing assembly 20 away from the injection molding body 30, and the end cap 40 and the injection molding body 30 are used to define the position of the load-bearing sealing assembly 20 and seal the load-bearing sealing assembly 20 therebetween. In addition, a through hole is provided on the end cap 40, and the stainless steel optical fiber unit 11 is penetrated by the through hole.

[0049] In a specific embodiment, the end cover 40 includes a limiting portion 41 and a fixing portion 42. The through hole is provided on the limiting portion 41. The limiting portion 41 abuts against the end of the load-bearing sealing assembly 20. Figure 2 As shown, the limiting portion abuts against the stopper 212 of the first cone 21. The fixing portion 42 has a first step surface and a second step surface, and the first step surface is pressed on the limiting portion 41. Figure 2As shown, a support platform is provided on the periphery of the limiting portion 41, the support platform is pressed on the first step surface, and the second step surface abuts against the end of the load-bearing sealing assembly 20. Specifically, the stopper 212 of the first cone 21 is flush with the end surface of the housing 27, part of the second step surface abuts against the stopper 212, and part of the second step surface abuts against the end surface of the housing 27. The fasteners penetrate the fixing portion 42 and the load-bearing sealing assembly 20 (housing 27) in sequence, realize the detachable connection between the fixing portion 42 and the load-bearing sealing assembly 20, and confine the first cone 21, the second cone 22 and the third cone between the injection molded body 30 and the end cover 40.

[0050] In the embodiment of the present invention, the first cone 21 may be a metal first cone 21 , the second cone 22 may be a metal second cone 22 , and the third cone 23 may be a metal third cone 23 .

[0051] The housing 27 in the embodiment of the present invention may be a metal housing 27 .

[0052] In the embodiment of the present invention, the submarine cable 10 is sealed and mechanically connected through the injection molding body 30, the load-bearing sealing assembly 20 and the end cover 40 to achieve connection with external equipment.

[0053] An embodiment of the present invention further provides a submarine cable having a submarine cable load-bearing sealing device at a connection end, including the submarine cable load-bearing sealing device in any of the above embodiments.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A load-bearing sealing device for a submarine cable, characterized in that: The submarine cable includes a stainless steel optical fiber unit, a non-metallic rod, a steel wire and an insulating layer arranged in sequence from the inside to the outside; The load-bearing sealing device for submarine optical cables comprises: an injection molding body and a load-bearing sealing assembly, wherein the load-bearing sealing assembly defines a first fixed space, a second fixed space and a third fixed space, wherein the stainless steel optical fiber unit is fixed in the first fixed space and extends out to connect with external equipment, wherein the non-metallic rod is fixed in the second fixed space, and wherein the steel wire is fixed in the third fixed space; The injection molding body is arranged at the end of the load-bearing sealing component, and the inner wall surface of the injection molding body covers part of the load-bearing sealing component and part of the insulating layer.

2. The load-bearing sealing device for submarine optical cables according to claim 1, characterized in that: The load-bearing sealing assembly comprises a first cone, a second cone and a third cone, and the first fixed space is provided in the first cone; The second cone is arranged on the outer periphery of the first cone, and the second fixed space is formed between the outer wall surface of the first cone and the inner wall surface of the second cone; The third cone is arranged on the outer periphery of the second cone, and the third fixed space is formed between the outer wall surface of the second cone and the inner wall surface of the third cone.

3. The load-bearing sealing device for submarine cables according to claim 2, characterized in that: The second fixing space includes a first fixing section and a second fixing section, the first fixing section is located between two adjacent second fixing sections, and the cross-sectional area of ​​the second fixing section is larger than the cross-sectional area of ​​the first fixing section.

4. The load-bearing sealing device for submarine optical cables according to claim 3, characterized in that: The cross-sectional area of ​​the first fixed section gradually increases from the first end to the second end; the cross-sectional area of ​​the second fixed section first increases and then decreases; both ends of the second fixed space are the second fixed sections.

5. The load-bearing sealing device for submarine optical cables according to claim 2, characterized in that: The load-bearing sealing assembly further comprises a shell, which is arranged on the outer periphery of the third cone, and the inner wall surface of the shell abuts against the outer wall surface of the third cone; A sealing portion is provided at the end of the shell, and the inner wall surface of the sealing portion is in contact with the insulating layer; the injection molded body is provided with a first channel and a second channel, the diameter of the first channel is larger than the diameter of the second channel, the inner wall surface of the first channel is in contact with the outer wall surface of the sealing portion, the inner wall surface of the second channel is in contact with the outer wall surface of the insulating layer, and the end surface of the sealing portion abuts against the end surface of the second channel.

6. The load-bearing sealing device for submarine optical cables according to claim 5, characterized in that: The outer wall surface of the sealing portion and the inner wall surface of the first channel are both provided with first grooves.

7. The load-bearing sealing device for submarine cables according to claim 1, characterized in that: The inner wall surface of the second fixed space and the inner wall surface of the third fixed space are both provided with a second groove.

8. The load-bearing sealing device for submarine optical cables according to claim 6, characterized in that: The first cone includes a cone portion and a stopper portion, wherein the stopper portion is disposed at an end portion of the cone portion, and an outer wall surface of the stopper portion abuts against an inner wall surface of the shell.

9. The load-bearing sealing device for submarine optical cables according to claim 6, characterized in that: It also includes an end cover, which is detachably connected to one end of the load-bearing sealing component away from the injection molded body; the end cover is provided with a through hole, and the stainless steel optical fiber unit passes through the through hole.

10. The load-bearing sealing device for submarine optical cables according to claim 9, characterized in that: The end cover includes a limiting portion and a fixing portion, the through hole is provided on the limiting portion, the limiting portion abuts against the end of the load-bearing sealing assembly, the fixing portion has a first step surface and a second step surface, the first step surface is pressed on the limiting portion, the second step surface abuts against the end of the load-bearing sealing assembly, and the fixing portion is connected to the shell by fasteners that pass through the fixing portion and the load-bearing sealing assembly in sequence.

11. A submarine cable having a submarine cable load-bearing sealing device at the connection end, characterized in that: It comprises the load-bearing sealing device for submarine optical cables as described in any one of claims 1 to 10.

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