Load-bearing and sealing apparatus for submarine optical cable, and submarine optical cable

Abstract

The present invention relates to the technical field of submarine cables. Provided are a load-bearing and sealing apparatus for a submarine optical cable, and a submarine optical cable. The submarine optical cable comprises a stainless steel optical fiber unit, non-metallic rods, steel wires and an insulating layer, which are arranged in sequence from inside to outside. The load-bearing and sealing apparatus for a submarine optical cable comprises: an injection-molded body and a load-bearing and sealing assembly, wherein the load-bearing and sealing assembly defines a first fixing space, a second fixing space and a third fixing space; the stainless steel optical fiber unit is fixed in the first fixing space and extends outward to connect to an external device, the non-metallic rods are fixed in the second fixing space, and the steel wires are fixed in the third fixing space; and the injection-molded body is arranged at an end portion of the load-bearing and sealing assembly, and an inner wall surface of the injection-molded body covers part of the load-bearing and sealing assembly and part of the insulating layer. The present invention achieves good sealing performance and good mechanical connectivity, thereby meeting use requirements.

Description

Seal device for submarine optical cable and submarine optical cable

[0001] The present application claims priority to the Chinese patent application No. 202411254304.0, filed on September 6, 2024, and entitled “Seal device for submarine optical cable and submarine optical cable”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of submarine optical cables, in particular to a seal device for submarine optical cable and submarine optical cable. BACKGROUND

[0003] Traditional submarine optical cables are metal armored, using 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, the submarine optical cable is subjected to the gravity of its underwater 10000m length and the tensile load of the terminal equipment during deployment and recovery, resulting in a low safety load margin. To achieve deployment and recovery at a water depth of 10000m and application, the strength / weight ratio and working load margin of the submarine optical cable need to be considered comprehensively, and the submarine optical cable also needs to have good water pressure resistance.

[0004] Lightweight and high-strength non-metallic rods (aramid rods, PBO non-metallic rods, etc., composed of a reinforcing layer of aramid and PBO fiber filaments and resin pouring and solidification, density ≤2.0g / cm 3 , breaking strength ≥1500MPa) become important load-bearing structural components of deep-sea optical cables. The submarine optical cable designed and manufactured using non-metallic rods as load-bearing elements has a high strength / weight ratio. If the submarine optical cable is armored only with non-metallic rods, although the self-weight is reduced, the problem of low safety factor during deployment and recovery at a water depth of 10000m is overcome, but the mechanical strength is small, and the submarine optical cable cannot maintain a vertical shape under water flow impact, the underwater dynamics and water pressure resistance are poor, and it is difficult to meet the application scenarios of high strength. Therefore, a new type of armored load-bearing structure is needed to reduce the self-weight while ensuring the mechanical strength of the submarine optical cable to meet the application at a water depth of 10000m.

[0005] Currently, the load-bearing seal assembly matched with the deep-sea optical cable to connect the underwater terminal equipment is a Ferrule type clamp assembly for steel wire armored or uses a glue pouring method for fixation. There is no load-bearing seal device matched with non-metallic armored submarine optical cable, which cannot meet the engineering application requirements of new type submarine optical cable. SUMMARY

[0006] The present application provides a seal device for submarine optical cable and submarine optical cable to solve the problem that the existing seal device for submarine optical cable cannot meet the use requirements.

[0007] The application provides a submarine optical cable force sealing device, which comprises a stainless steel optical fiber unit, a non-metallic rod, a steel wire and an insulation layer arranged from inside to outside; the submarine optical cable force sealing device comprises an injection body and a force sealing assembly, the force sealing assembly is defined with a first fixing space, a second fixing space and a third fixing space, the stainless steel optical fiber unit is fixed in the first fixing space and extends out to be connected with external equipment, the non-metallic rod is fixed in the second fixing space, and the steel wire is fixed in the third fixing space; the injection body is arranged at the end of the force sealing assembly, and the inner wall surface of the injection body covers part of the force sealing assembly and part of the insulation layer.

[0008] According to the submarine optical cable force sealing device, the force sealing assembly comprises a first cone, a second cone and a third cone, the first cone is internally provided with the first fixing space; the second cone is arranged at the outer periphery of the first cone, the second fixing space is formed between the outer wall surface of the first cone and the inner wall surface of the second cone; and the third cone is arranged at the outer periphery of the second cone, and the third fixing space is formed between the outer wall surface of the second cone and the inner wall surface of the third cone.

[0009] According to the submarine optical cable force sealing device, the second fixing space comprises 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 greater than that of the first fixing section.

[0010] According to the submarine optical cable force sealing device, the cross-sectional area of the first fixing section gradually increases from a first end to a second end; the cross-sectional area of the second fixing section first increases and then decreases; and both ends of the second fixing space are the second fixing sections.

[0011] According to the submarine optical cable force sealing device, the force sealing assembly further comprises a shell, the shell is arranged at the outer periphery of the third cone, the inner wall surface of the shell abuts against the outer wall surface of the third cone; a sealing part is arranged at the end of the shell, the inner wall surface of the sealing part is attached to the outer wall surface of the insulation layer; the injection body is provided with a first channel and a second channel, the diameter of the first channel is greater than that of the second channel, the inner wall surface of the first channel is attached to the outer wall surface of the sealing part, the inner wall surface of the second channel is attached to the outer wall surface of the insulation layer, and the end surface of the sealing part abuts against the end surface of the second channel.

[0012] According to the submarine optical cable force sealing device, the outer wall surface of the sealing part and the inner wall surface of the first channel are both provided with a first groove.

[0013] 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.

[0014] The first cone comprises a cone part and a stop part, the stop part is arranged at the end of the cone part, and the outer wall surface of the stop part abuts against the inner wall surface of the shell.

[0015] The sea optical cable force sealing device further comprises an end cover, the end cover is detachably connected to the end of the force sealing assembly away from the injection body, the end cover is provided with a through hole, and the stainless steel optical fiber unit passes through the through hole.

[0016] The end cover comprises a limiting part and a fixing part, the through hole is arranged on the limiting part, the limiting part abuts against the end of the force sealing assembly, the fixing part is provided with a first step surface and a second step surface, the first step surface is arranged on the limiting part, the second step surface abuts against the end of the force sealing assembly, and the fixing part is connected to the shell by means of fasteners arranged in sequence on the fixing part and the force sealing assembly.

[0017] The application further provides a sea optical cable provided with the sea optical cable force sealing device at the connecting end.

[0018] The sea optical cable force sealing device and the sea optical cable provided by the application can fix the stainless steel optical fiber unit in the first fixed space, the end of the stainless steel optical fiber unit extends out of the first fixed space and is connected to external equipment, the non-metallic rod is fixed in the second fixed space, the steel wire is fixed in the third fixed space, the fixing and mechanical connection of the sea optical cable are realized, the injection body is arranged at the end of the force sealing assembly, the end of the force sealing assembly is sealed, and seawater is prevented from entering the force sealing assembly through the gap between the insulating layer and the force sealing assembly. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0020] Fig. 1 is a schematic diagram of a cross-sectional structure of a submarine optical cable according to the present application;

[0021] Fig. 2 is a schematic diagram of a cross-sectional structure of a force-sealing device of a submarine optical cable according to the present application;

[0022] Fig. 3 is a schematic diagram of a cross-sectional structure of a force-sealing assembly according to the present application;

[0023] Reference signs: 10 - submarine optical cable; 11 - stainless steel optical fiber unit; 12 - non-metallic rod; 13 - steel wire; 14 - water-blocking member; 15 - conductor; 16 - insulation layer; 20 - force-sealing assembly; 21 - first cone; 211 - cone part; 212 - stop part; 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 part; 29 - second groove; 30 - injection-molded body; 31 - first groove; 40 - end cap; 41 - limiting part; 42 - fixed part. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0025] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0026] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0030] The submarine optical cable bearing sealing device and submarine optical cable of the present invention are described below with reference to Figures 1-3.

[0031] As shown in Figure 1, the submarine optical cable 10 in the embodiment of the present application comprises, from inside to outside, a stainless steel optical fiber unit 11, a non-metallic rod 12, a steel wire 13, a water blocking element 14, a conductor 15 and an insulation layer 16. Specifically, the non-metallic rod 12 is arranged on the outer periphery of the stainless steel optical fiber unit 11, the diameters of the non-metallic rods 12 can be the same or different, the non-metallic rods 12 with different diameters are tightly twisted on the outer periphery of the stainless steel optical fiber unit 11 to prevent the non-metallic rods 12 from being broken due to excessive bending, the non-metallic rods 12 are not pre-deformed, the steel wires 13 are tightly twisted in the gaps between the outer peripheries of the non-metallic rods 12, and the steel wires 13 are pre-formed. The non-metallic rods 12 and the steel wires 13 can be formed by a hybrid armor forming process, the non-metallic rods 12 and the steel wires 13 are twisted in the same direction and have the same pitch, the non-metallic rods 12 with different diameters are tangent to each other and have different diameters between the two layers of the non-metallic rods 12 and the steel wires 13 adjacent to each other, the armor coverage of each layer is greater than or equal to 99%, the non-metallic rods 12 and the armored steel wires 13 are formed by one-time twisting to form a cage-shaped support structure, thereby improving the compression support capability, specific gravity and realizing the bending protection of the submarine optical cable 10. The water blocking element 14 is filled in the gaps between the non-metallic rods 12 and the steel wires 13, the conductor 15 can be a copper conductor 15, and the copper conductor is wrapped around the load-bearing unit (the non-metallic rods 12 and the steel wires 13). The insulation layer 16 is wrapped on the outer wall surface of the conductor 15, and the insulation layer 16 can be a polyethylene insulation layer 16. The non-metallic rods 12, the steel wires 13, the water blocking element 14 and the conductor 15 together constitute the water blocking and load-bearing structure of the submarine optical cable 10 to form good mechanical properties such as tensile and compression resistance while meeting the underwater strength / weight ratio and having a large working load margin.

[0032] The submarine optical cable 10 in the embodiment of the present application adopts the hybrid armor type of the non-metallic rods 12 and the steel wires 13 to meet the lightweight requirement, ensure the safety margin of the submarine optical cable 10 in the construction application process, meet the underwater mechanical strength / weight ratio, ensure that the submarine optical cable 10 remains vertical under the impact of water flow by using its own weight, and improve the application water depth of the submarine optical cable 10. In addition, the submarine optical cable 10 can also meet the mechanical property requirements such as compression resistance and tensile resistance, and under the condition that the submarine optical cable 10 is subjected to high water pressure or tension in the full-sea-depth environment, the good tensile and compression resistance ensures that the submarine optical cable 10 does not deform and fail.

[0033] The submarine optical cable load-bearing sealing device provided by the embodiment of the present application comprises an injection body 30 and a load-bearing sealing assembly 20, the load-bearing sealing assembly 20 is defined with a first fixed space 24, a second fixed space 25 and a third fixed space 26, the stainless steel optical fiber unit 11 is fixed in the first fixed space 24 and extends out to be connected 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; the end of the load-bearing sealing assembly 20 is further provided with the injection body 30, and the inner wall surface of the injection body 30 covers part of the load-bearing sealing assembly 20 and part of the insulation layer 16.

[0034] In the case that the submarine optical cable 10 needs to be connected with external equipment (such as terminal equipment), the submarine optical 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 extends out to be connected 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.

[0035] In an optional embodiment, the load-bearing sealing assembly 20 includes a first cylinder, a second cylinder and a third cylinder. The first cylinder is provided with a first fixed space 24, 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 the second cylinder and the first fixed cylinder form a second fixed space 25 therebetween, 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 the outer wall surface of the second cylinder and the inner wall surface of the first cylinder form a third fixed space 26 therebetween, and 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.

[0036] Further, the injection body 30 is arranged at the end of the load-bearing sealing assembly 20, and the injection body 30 is used to block the load-bearing sealing assembly 20. Specifically, part of the inner wall surface of the injection body 30 is fitted with the load-bearing sealing assembly 20, and another part of the inner wall surface of the injection body 30 is fitted with the insulating layer 16 of the submarine optical cable 10, so that seawater is prevented from entering the load-bearing sealing assembly 20 from the outer wall surface between the load-bearing sealing assembly 20 and the insulating layer 16, and the sealing performance is good.

[0037] The submarine optical cable load-bearing sealing device provided by the embodiment of the present application has the following advantages. The end of the stainless steel optical fiber unit 11 extends out to be connected with external equipment by fixing the stainless steel optical fiber unit 11 in the first fixed space 24, 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 that the submarine optical cable 10 is fixed and mechanically connected. The end of the load-bearing sealing assembly 20 is sealed by arranging the injection body 30 at the end of the load-bearing sealing assembly 20, so that seawater is prevented from entering the load-bearing sealing assembly 20 from the gap between the insulating layer 16 and the load-bearing sealing assembly 20. The submarine optical cable provided by the embodiment of the present application has moderate strength / weight ratio and large working load margin, and can be matched with mixed armored submarine optical cable engineering application. The load-bearing sealing device has good sealing performance and mechanical connection performance, and can meet the use requirements.

[0038] As shown in FIG. 1, the force bearing sealing assembly 20 provided by the embodiment of the present application comprises 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 at the outer periphery of the first cone 21, and the outer wall surface of the first cone 21 and the inner wall surface of the second cone 22 form a second fixed space 25. The third cone 23 is arranged at the outer periphery of the second cone 22, and the outer wall surface of the second cone 22 and the inner wall surface of the third cone 23 form a third fixed space 26.

[0039] During installation, the center of the first cone 21 is provided with the first fixed space 24, such as a through hole, which is matched in size with the stainless steel fiber unit 11. The stainless steel fiber unit 11 is fixed in the through hole. The end of the stainless steel fiber unit 11 can extend out of the through hole to be connected with external equipment. The non-metallic rods 12 are spread along the circumference of the first cone 21, and the second cone 22 is pressed against the outer wall surface of the first cone 21, so as to fix the non-metallic rods 12 between the inner wall surface of the second cone 22 and the outer wall surface of the first cone 21, i.e. in the second fixed space 25, thereby achieving the fixation of the non-metallic rods 12. The steel wires 13 are all spread and uniformly distributed on the outer wall surface of the second cone 22, and the third cone 23 is pressed against the outer wall surface of the second cone 22, so as to fix the steel wires 13 between the outer wall surface of the second cone 22 and the inner wall surface of the third cone 23, i.e. in the third fixed space 26, thereby achieving the fixation of the steel wires 13.

[0040] 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, as long as the peeled non-metallic rods 12 and the steel wires 13 can be fixed.

[0041] In the embodiment of the present application, the second fixed space 25 comprises first fixed sections 251 and second fixed sections 252. The first fixed sections 251 are located between adjacent two second fixed sections 252, and the cross-sectional area of the second fixed sections 252 is larger than that of the first fixed sections 251.

[0042] In a specific embodiment, the cross-sectional area of the first fixed sections 251 gradually increases from the first end to the second end, the cross-sectional area of the second fixed sections 252 first increases and then decreases, and both ends of the second fixed space 25 are the second fixed sections 252. As shown in FIG. 3, the second fixed sections 252 are located between adjacent two first fixed sections 251, and the cross-sectional area of the second fixed sections 252 gradually increases from the end close to the first fixed section 251 to the middle part. The first fixed section 251 serves as a buckling fastening ring to prevent the non-metallic rods 12 from slipping off under force, and the second fixed section 252 can increase the contact area with the non-metallic rods 12 relative to the first fixed section 251 to prevent the non-metallic rods 12 from slipping off.

[0043] Specifically, the outer wall surface of the first cone 21 is provided with a first protrusion and a first groove, the inner wall surface of the second cone 22 is provided with a second protrusion and a second groove, the first protrusion is pressed into the second groove, and the second protrusion is pressed into the first groove. The bottom of the first groove and the bottom of the second groove are flat, and the first protrusion and the second protrusion are arc surfaces.

[0044] In an optional embodiment, the first fixed section 251 has a circular cross section, the cross-sectional area of the first fixed section 251 in the extension direction is equal, the second fixed section 252 also has a circular cross section, and the cross-sectional area of the second fixed section 252 in the extension direction is equal.

[0045] In another embodiment, the first fixed section 251 has a circular cross section, the cross-sectional area of the first fixed section 251 in the extension direction gradually increases, the second fixed section 252 also has a circular cross section, and the cross-sectional area of the second fixed section 252 in the extension direction also gradually increases, wherein the smallest cross section of the second fixed section 252 is connected to the largest cross section of the first fixed section 251.

[0046] 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. As shown in FIG. 3, 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, i.e., increases the friction between the non-metallic rod 12 and the contact surface thereof, thereby preventing the non-metallic rod 12 from slipping under stress. Specifically, the inner wall surface of the first fixed section 251 and the inner wall surface of the second fixed section 252 are both provided with a second groove 29, which further limits the position of the non-metallic rod 12.

[0047] The outer wall surface of the second cone 22 and the inner wall surface of the third cone 23 are also provided with a second groove 29, which increases the friction between the outer wall surface of the second cone 22 and the inner wall surface of the third cone 23, i.e., increases the friction between the steel wire 13 and the contact surface thereof, thereby preventing the steel wire 13 from slipping under stress.

[0048] The force-bearing sealing assembly 20 in the embodiment of the application further includes a shell 27, which is arranged at the outer periphery of the third cone 23, the inner wall surface of the shell 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. As shown in FIG. 2, the end of the shell 27 is provided with a sealing part 28, the inner wall surface of the sealing part 28 is attached to the insulating layer 16, the sealing part 28 is in close contact with the insulating layer 16, and water is prevented from entering the inside of the shell 27. In an embodiment, a sealing member such as sealing glue is arranged between the sealing part 28 and the insulating layer 16, and the sealing effect is good.

[0049] Further, the injection body 30 is provided with a first channel and a second channel, the diameter of the first channel is larger than that of the second channel, and the connection of the first channel and the second channel forms a step surface. The inner wall surface of the first channel is attached to the outer wall surface of the sealing part 28, the inner wall surface of the second channel is attached to the outer wall surface of the insulation layer 16, and the end surface of the sealing part 28 is in abutment with the end surface of the second channel, that is, in abutment with the step surface, which not only limits the position of the sealing part 28, but also strengthens the sealing and prevents seawater from entering the load-bearing sealing assembly 20 from the end of the sealing part 28.

[0050] To strengthen the connection between the sealing part 28 and the injection 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 an 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 adjacent two 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 adjacent two 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 injection body 30 and the sealing part 28 is increased, the tensile capacity is improved, and the two are prevented from being separated under stress. On the other hand, the polyethylene after injection is tightly clamped and closely attached to the groove and the shell by the centripetal shrinkage pressure formed by cooling, and the longitudinal water-tightness is improved.

[0051] The first cone 21 in the embodiment of the application includes a cone part 211 and a stop part 212, the stop part 212 is arranged at the end of the cone part 211 away from the injection body 30, the cone part 211 is used for fixing the stainless steel optical fiber unit 11, and the outer wall surface of the stop part 212 is in abutment with the inner wall surface of the shell 27, so that the cone part 211, the second cone 22 and the third cone 23 are limited in the shell 27. It should be noted that the stop part 212 is provided with a through hole, so that the stainless steel optical fiber unit 11 can extend out.

[0052] The load-bearing sealing device for the submarine optical cable in the embodiment of the application further includes an end cover 40, the end cover 40 is detachably connected to the end of the load-bearing sealing assembly 20 away from the injection body 30, and the end cover 40 and the injection body 30 are used for limiting the position of the load-bearing sealing assembly 20 and sealing the load-bearing sealing assembly 20 between them. In addition, the end cover 40 is provided with a through hole, and the stainless steel optical fiber unit 11 passes through the through hole.

[0053] In one specific embodiment, the end cover 40 comprises a limiting portion 41 and a fixing portion 42, a through hole is arranged on the limiting portion 41, the limiting portion 41 abuts against the end of the load-bearing sealing assembly 20, as shown in FIG. 2, the limiting portion abuts against the stop portion 212 of the first cone 21. The fixing portion 42 has a first step surface and a second step surface, the first step surface is arranged on the limiting portion 41, as shown in FIG. 2, the outer periphery of the limiting portion 41 is provided with a support platform, the first step surface is arranged on the support platform, and the second step surface abuts against the end of the load-bearing sealing assembly 20. The fastener is arranged through the fixing portion 42 and the load-bearing sealing assembly 20 (the shell 27) in sequence, so as to realize the detachable connection between the fixing portion 42 and the load-bearing sealing assembly 20, and to limit the first cone 21, the second cone 22 and the third cone 23 between the injection molded body 30 and the end cover 40.

[0054] The first cone 21 in the embodiment of the present application can be a metal first cone 21, the second cone 22 can be a metal second cone 22, and the third cone 23 can be a metal third cone 23.

[0055] The shell 27 in the embodiment of the present application can be a metal shell 27.

[0056] The embodiment of the present application realizes the sealing and mechanical connection of the submarine optical cable 10 through the injection molded body 30, the load-bearing sealing assembly 20 and the end cover 40, and realizes the connection with external equipment.

[0057] The embodiment of the present application also provides a submarine optical cable with a submarine optical cable load-bearing sealing device at a connection end, comprising the submarine optical cable load-bearing sealing device in any one of the above embodiments.

[0058] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A submarine optical cable load bearing sealing device, characterized by, The submarine optical cable comprises, from inside to outside, a stainless steel optical fiber unit, a non-metallic rod, a steel wire and an insulation layer; The force-bearing sealing device of the submarine optical cable comprises an injection body and a force-bearing sealing assembly, the force-bearing sealing assembly is defined with a first fixing space, a second fixing space and a third fixing space, the stainless steel optical fiber unit is fixed in the first fixing space and extends out to be connected with external equipment, the non-metallic rod is fixed in the second fixing space, and the steel wire is fixed in the third fixing space; The injection body is arranged at the end of the force-bearing sealing assembly, and the inner wall surface of the injection body covers part of the force-bearing sealing assembly and part of the insulation layer.

2. The submarine optical cable load bearing sealing device according to claim 1, characterized in that, The force-bearing sealing assembly comprises a first cone, a second cone and a third cone, the first cone is internally provided with the first fixing space; The second cone is arranged at the outer periphery of the first cone, and the second fixing 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 at the outer periphery of the second cone, and the third fixing space is formed between the outer wall surface of the second cone and the inner wall surface of the third cone.

3. The submarine cable load bearing sealing device according to claim 2, wherein, The second fixing space comprises 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 greater than that of the first fixed section.

4. The submarine optical cable load bearing sealing device 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, and both ends of the second fixing space are the second fixed sections.

5. The submarine cable load bearing sealing device of claim 2, wherein, The force-bearing sealing assembly further comprises a shell, the shell is arranged at 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; The end of the shell is provided with a sealing part, the inner wall surface of the sealing part is attached to the outer wall surface of the insulation layer, the injection body is provided with a first channel and a second channel, the diameter of the first channel is greater than that of the second channel, the inner wall surface of the first channel is attached to the outer wall surface of the sealing part, the inner wall surface of the second channel is attached to the outer wall surface of the insulation layer, and the end surface of the sealing part abuts against the end surface of the second channel.

6. The submarine optical cable load bearing sealing device according to claim 5, characterized in that, The outer wall surface of the sealing part and the inner wall surface of the first channel are both provided with a first groove.

7. The submarine optical cable load bearing sealing device according to claim 1, wherein, The inner wall surface of the second fixing space and the inner wall surface of the third fixing space are both provided with a second groove.

8. The submarine optical cable load bearing sealing device according to claim 6, characterized in that, The first cone comprises a cone part and a stop part, the stop part is arranged at the end of the cone part, and the outer wall surface of the stop part abuts against the inner wall surface of the shell.

9. The submarine cable load bearing sealing device of claim 6, wherein, Further comprising an end cover, the end cover is detachably connected to one end of the force-bearing sealing assembly away from the injection body, the end cover is provided with a through hole, and the stainless steel optical fiber unit passes through the through hole.

10. The submarine optical cable load bearing sealing device according to claim 9, characterized in that, The end cover comprises a limiting part and a fixing part, the through hole is arranged on the limiting part, the limiting part abuts against the end of the force-bearing sealing assembly, the fixing part has a first step surface and a second step surface, the first step surface is arranged on the limiting part, the second step surface abuts against the end of the force-bearing sealing assembly, and the fixing part is connected with the shell by means of fasteners arranged on the fixing part and the force-bearing sealing assembly in sequence.

11. A submarine optical cable having a submarine optical cable load bearing sealing device at a connection end, characterized in that A submarine cable load bearing sealing device as claimed in any one of claims 1 to 10.

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