An injection-molded top-press type submarine optical cable joint box

Abstract

The application relates to the technical field of submarine optical cable connection, and discloses an injection-molding top-pressing type submarine optical cable joint box, which comprises a cable rubber anti-bending device, one end of the cable rubber anti-bending device is fixedly connected with a metal anti-bending device adapter, one end of the cable rubber anti-bending device is fixedly installed with a metal anti-bending joint through the metal anti-bending device adapter, one end of the metal anti-bending joint is fixedly installed with an injection-molding cable joint insert, the inside of the injection-molding cable joint insert is fixedly provided with an injection-molding joint, the inner wall of the cable rubber anti-bending device is fixedly installed with a PU pipe body, and one end of the PU pipe body is sleeved with one end of the injection-molding joint. The injection-molding process is used to inject an injection-molding colloid to the connection interface, the colloid is filled and solidified in a No.1 annular groove, a No.2 annular groove and a thread groove of a submarine cable outer sheath, and a connection structure with mechanical interlocking and sealing integration is formed. Meanwhile, the anti-bending chain formed by the cable rubber anti-bending device and the metal anti-bending joint and the weight-reducing framework jointly improve the anti-bending capacity and the structural stability of the joint box.

Description

Technical Field

[0001] This invention belongs to the field of submarine optical cable connection technology, specifically relating to an injection-molded top-pressure type submarine optical cable junction box. Background Technology

[0002] In the laying and connection of submarine optical cables, splice closures are critical accessories used to achieve cable splicing, sealing, and mechanical protection. In existing technologies, traditional submarine optical cable splice closures typically use a rubber ring in conjunction with a metal ring for internal sealing. However, this installation method is cumbersome and requires highly skilled installation personnel. Furthermore, rubber rings are prone to deformation and aging under long-term use and water pressure, posing a risk of leakage and affecting the long-term reliability of the splice closure and the safe operation of the submarine optical cable system.

[0003] Therefore, an injection-molded top-pressure submarine optical cable junction box is proposed to solve the above problems. Summary of the Invention

[0004] This invention proposes an injection-molded top-pressure type submarine optical cable junction box, which solves the problem that traditional submarine optical cable junction boxes in related technologies usually use a rubber ring and a metal ring for internal sealing. The rubber ring is prone to deformation and aging under long-term use and water pressure, which poses a risk of water leakage and affects the long-term reliability of the junction box and the safe operation of the submarine optical cable system.

[0005] The technical solution of the present invention is as follows: A top-pressure injection-molded submarine optical cable junction box includes: a cable rubber bend protector, one end of which is fixedly connected to a metal bend protector adapter, one end of which is fixedly installed with a metal bend joint via the metal bend protector adapter, one end of which is fixedly installed with an injection-molded cable joint insert, an injection-molded joint fixedly disposed inside the injection-molded cable joint insert, a PU tube body fixedly disposed on the inner wall of the cable rubber bend protector, one end of which is sleeved on one end of the injection-molded joint, a PU tube clamping ring snapped onto the outside of the PU tube body sleeved on one end of the injection-molded joint, a submarine cable fixedly disposed inside the PU tube body via the injection-molded joint, and a sealing plug fixedly disposed at the contact position between one end of the PU tube body and the submarine cable.

[0006] Preferably, a central steel wire fastener is fixedly provided on the inner wall of the injection joint, and an internal steel wire fastener is fixedly provided inside the injection joint via a submarine cable, the internal steel wire fastener being located inside the submarine cable.

[0007] Preferably, an open-type O-ring retainer is fixedly installed on the outside of the injection joint, and an O-ring body is sleeved on the outside of the injection joint.

[0008] Preferably, the injection molding joint has a first annular groove on the outer surface of one end inside the PU tube body, and the submarine cable has a second annular groove near the injection molding joint.

[0009] Preferably, the injection joint is located inside the PU tube body at one end, and the injection molding compound is injected into the outside of the other end, filling the interior of the first and second annular grooves.

[0010] Preferably, there are multiple metal bending joints, which are interconnected by locking pins to form a metal bending tube.

[0011] Preferably, a weight-reducing skeleton is also fixedly provided inside the PU tube body. The weight-reducing skeleton is located outside the submarine cable, between the end of the injection joint and the sealing plug.

[0012] Preferably, the sealing plug has a one-way glue-filling channel at its center, and the one-way glue-filling channel is provided with a one-way valve structure or a puncture-resistant sealing membrane.

[0013] The working principle and beneficial effects of this invention are as follows: Injection-molded colloid is injected into the connection interface via injection molding. The colloid fills and solidifies in the first annular groove, the second annular groove, and the threaded groove of the submarine cable's outer sheath, forming a mechanically interlocked and sealed connection structure. Simultaneously, the cable rubber bending resist, the bending chain composed of the metal bending joint, and the weight-reducing skeleton collectively enhance the bending resistance and structural stability of the junction box. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0017] Figure 3 This is a cross-sectional view of the present invention;

[0018] Figure 4 For the present invention Figure 3 A magnified view of part A in the image;

[0019] Figure 5 For the present invention Figure 3 A magnified view of part B in the image.

[0020] In the diagram: 1. Cable rubber bending resist; 2. Metal bending resist adapter; 3. Metal bending joint; 4. Injection-molded cable connector insert; 5. Injection-molded connector; 6. PU tube body; 7. PU tube crimping ring; 8. Submarine cable; 9. Sealing plug; 10. Central steel wire fixing component; 11. Internal steel wire fixing component; 12. Open-type O-ring retainer; 13. O-ring body; 14. No. 1 annular groove; 15. No. 2 annular groove; 16. Injection-molded colloid; 17. Weight-reducing skeleton. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1 -5. A type injection-molded top-pressure submarine optical cable junction box, comprising: a cable rubber bend resister 1, a metal bend resister adapter 2 fixedly connected to one end of the cable rubber bend resister 1, a metal bend resist joint 3 fixedly installed at one end of the cable rubber bend resister 1 through the metal bend resister adapter 2, an injection-molded cable joint insert 4 fixedly installed at one end of the metal bend resist joint 3, an injection-molded connector 5 fixedly installed inside the injection-molded cable joint insert 4, a PU tube body 6 fixedly installed on the inner wall of the cable rubber bend resister 1, one end of the PU tube body 6 sleeved on one end of the injection-molded connector 5, a PU tube clamping ring 7 snapped onto the outside of the PU tube body 6 sleeved on one end of the injection-molded connector 5, a submarine cable 8 fixedly installed inside the PU tube body 6 through the injection-molded connector 5, and a sealing plug 9 fixedly installed at the contact position between one end of the PU tube body 6 and the submarine cable 8.

[0023] The technical solution provided in this embodiment is as follows: First, the outer sheath of the end of the submarine cable 8 is stripped to expose the internal protective steel wire, and the steel wire is dispersed in an umbrella shape. Then, the internal steel wire fixing member 11 is inserted into the inner side of the steel wire layer of the submarine cable 8, and the middle steel wire fixing member 10 is placed in the middle of the steel wire layer, and works with the external steel wire fixing member to press and fix the steel wire, so that the tensile strength of the submarine cable 8 can be reliably transferred to the injection joint 5. Next, the injection joint 5 is sleeved with the PU tube body 6 and secured by the PU tube clamping ring 7. Between the outer wall of the injection joint 5 and the inner wall of the PU tube body 6, the O-ring body 13 is positioned by the open-type O-ring retainer 12 to form an initial radial seal. Then, the sealing plug 9 is installed at the contact point between the PU tube body 6 and the submarine cable 8. The injection gun is connected through the one-way injection channel with a built-in one-way valve or a puncture-resistant sealing membrane in the center of the plug. Injection molding compound 16 is injected into the outer end of the injection joint 5 located inside the PU tube body 6, ensuring that the injection molding compound 16 completely fills and cures in the first annular groove 14, the second annular groove 15, and the threaded groove of the outer sheath of the submarine cable 8, forming a mechanically interlocked and sealed integrated structure. Simultaneously, a weight-reducing skeleton 17 is provided inside the PU tube body 6, between the end of the injection joint 5 and the sealing plug 9, to provide radial support and bending toughness for the submarine cable 8. Finally, the injection-molded cable joint insert 4 is fixed to the outside of the injection joint 5, and multiple metal bending joints 3 are sequentially connected by locking pins to form a metal bending tube, a metal bending adapter 2, and a cable rubber bending device 1, completing the assembly of the entire joint box.

[0024] Furthermore, a central steel wire fastener 10 is fixedly installed on the inner wall of the injection joint 5, and an internal steel wire fastener 11 is fixedly installed inside the injection joint 5 via the submarine cable 8. The internal steel wire fastener 11 is located inside the submarine cable 8.

[0025] Specifically, the internal steel wire fastener 11 is fitted inside the steel wire layer of the submarine cable 8, and the middle steel wire fastener 10 is located in the middle of the steel wire layer. Together with the external steel wire fastener, the protective steel wires of the submarine cable 8 are dispersed in an umbrella shape and then pressed and fixed, so that the tensile strength of the submarine cable 8 is reliably transferred to the junction box, preventing the submarine cable 8 from coming out of the junction when under tension.

[0026] Furthermore, an open-type O-ring retainer 12 is fixedly installed on the outside of the injection joint 5, and an O-ring body 13 is sleeved on the outside of the injection joint 5.

[0027] Specifically, the open-type O-ring retainer 12 positions the O-ring body 13 between the outer wall of the injection joint 5 and the inner wall of the PU tube body 6. The O-ring body 13 is radially compressed to form an initial seal, which plays a temporary sealing role before the injection molded colloid 16 is cured, preventing external water or impurities from entering the connection interface.

[0028] Furthermore, an annular groove 14 is formed on the outer surface of one end of the injection joint 5 located inside the PU tube body 6, and a second annular groove 15 is formed on the submarine cable 8 near the injection joint 5.

[0029] Specifically, the first annular groove 14 and the second annular groove 15 are arranged opposite each other in the axial direction, both providing additional anchoring space for the injection-molded material 16. After the injection-molded material 16 fills into these grooves, it cures to form a "mortise and tenon" locking structure, which significantly enhances the anti-slip ability between the injection-molded material and the metal parts and the outer sheath of the submarine cable 8.

[0030] Furthermore, the injection joint 5 is located inside the PU tube body 6, and one end of it is filled with injection molding compound 16. The injection molding compound 16 fills the interior of the first annular groove 14 and the second annular groove 15.

[0031] Specifically, the injection-molded colloid 16 is injected using a high-temperature melt injection molding process, and after cooling and solidification, it forms a dense sealing layer. On the one hand, it fills all the gaps between the injection-molded joint 5 and the submarine cable 8, and on the other hand, it enters the threaded grooves on the surface of the outer sheath of the submarine cable 8 as well as the first annular groove 14 and the second annular groove 15, achieving triple mechanical interlocking, thereby providing a long-term, reliable water pressure resistant seal and avoiding the risk of leakage due to aging of traditional rubber rings.

[0032] Furthermore, there are multiple metal bending joints 3, which are interconnected by locking pins to form a metal bending pipe.

[0033] Specifically, multiple metal bending joints 3 are hinged at both ends by locking pins to form a transition section that can be bent but cannot be bent excessively. This can evenly distribute bending stress along the length of the pipe, prevent local bending damage at the connection between the junction box and the submarine cable 8, and allow the device to adapt to the bending of the seabed topography or the laying path.

[0034] Furthermore, a weight-reducing skeleton 17 is fixedly installed inside the PU tube body 6. The weight-reducing skeleton 17 is located outside the submarine cable 8, between the end of the injection joint 5 and the sealing plug 9.

[0035] Specifically, the weight-reducing frame 17 is made of lightweight materials and has a ring-shaped support structure. Its inner wall is in contact with the outer sheath of the submarine cable 8, and its outer wall is against the inner wall of the PU tube body 6. It reduces the overall weight while ensuring structural strength, and at the same time provides radial support and bending toughness for the submarine cable 8 in the transition section, preventing the injection molding layer from cracking due to bending.

[0036] Furthermore, the center of the sealing plug 9 is provided with a one-way glue-filling channel, and a one-way valve structure or a puncture-resistant sealing membrane is provided in the one-way glue-filling channel.

[0037] Specifically, during injection molding, the injection gun injects the injection colloid 16 through the one-way colloid channel of the sealing plug 9. The one-way valve or sealing membrane allows the colloid to flow into the joint in one direction. After injection molding is completed, it automatically seals to prevent the colloid from flowing back and external water pressure from entering. This structure eliminates the need for additional sealing operations during the colloid injection process, simplifying the on-site construction steps.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A top-press injection molded submarine optical cable junction box, characterized in that, include: A cable rubber bending device (1) is fixedly connected to a metal bending adapter (2) at one end. A metal bending joint (3) is fixedly installed at one end of the cable rubber bending device (1) through the metal bending adapter (2). An injection-molded cable connector insert (4) is fixedly installed at one end of the metal bending joint (3). An injection-molded connector (5) is fixedly installed inside the injection-molded cable connector insert (4). A PU tube body (6) is fixedly installed on the inner wall of the cable rubber bending device (1). One end of the PU tube body (6) is sleeved on one end of the injection-molded connector (5). A PU tube clamping ring (7) is snapped onto the outside of the PU tube body (6) sleeved on one end of the injection-molded connector (5). A submarine cable (8) is fixedly installed inside the PU tube body (6) through the injection-molded connector (5). A sealing plug (9) is fixedly installed at the position where one end of the PU tube body (6) contacts the submarine cable (8).

2. The injection-molded top-pressure type submarine optical cable junction box according to claim 1, characterized in that: The inner wall of the injection joint (5) is fixedly provided with a central steel wire fastener (10), and the interior of the injection joint (5) is fixedly provided with an internal steel wire fastener (11) through the submarine cable (8). The internal steel wire fastener (11) is located inside the submarine cable (8).

3. The injection-molded top-pressure type submarine optical cable junction box according to claim 1, characterized in that: An open-type O-ring retainer (12) is fixedly installed on the outside of the injection joint (5), and an O-ring body (13) is sleeved on the outside of the injection joint (5).

4. The injection-molded top-pressure type submarine optical cable junction box according to claim 1, characterized in that: The injection joint (5) has a first annular groove (14) on the outer surface of one end inside the PU tube body (6), and the submarine cable (8) has a second annular groove (15) near the injection joint (5).

5. The injection-molded top-pressure type submarine optical cable junction box according to claim 4, characterized in that: The injection joint (5) is located inside the PU tube body (6) and is filled with injection molding material (16). The injection molding material (16) fills the interior of the first annular groove (14) and the second annular groove (15).

6. The injection-molded top-pressure type submarine optical cable junction box according to claim 1, characterized in that: There are multiple metal bending joints (3), and multiple metal bending joints (3) are connected to each other by locking pins to form a metal bending pipe.

7. The injection-molded top-pressure type submarine optical cable junction box according to claim 1, characterized in that: The PU tube body (6) is also fixedly provided with a weight reduction skeleton (17), which is located outside the submarine cable (8) and between the end of the injection joint (5) and the sealing plug (9).

8. The injection-molded top-pressure type submarine optical cable junction box according to claim 1, characterized in that: The sealing plug (9) has a one-way glue-filling channel in the center, and a one-way valve structure or a puncture-resistant sealing membrane is provided in the one-way glue-filling channel.

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