Water pressure resistant 8MPa fluorinated ethylene propylene insulated longitudinal watertight cable
By introducing a linked structure of movable plates, compression springs, and air bladders into the submarine cable, the problem of damage caused by improper buoyancy adjustment of the submarine cable under different water depths was solved, realizing adaptive buoyancy adjustment and improving the cable's water pressure resistance and safety.
Patent Information
- Application Number
- CN202511455587.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-13
- Publication Date
- 2026-01-20
AI Technical Summary
During the laying and retrieval of existing submarine cables, the buoyancy cannot be adjusted adaptively, resulting in excessive dragging, bending damage, or bouncing and collisions in shallow water environments, which affects safety and efficiency.
It adopts a longitudinal watertight cable with polytetrafluoroethylene insulation. Through the linkage structure of movable plates, extrusion springs and air storage bladders, the buoyancy is adaptively adjusted according to water pressure. The mechanical linkage mechanism dynamically adjusts the buoyancy in different water depth environments to avoid dragging and collision.
It enables precise adjustment of cable buoyancy in different water depths, avoids damage during laying and retrieval, improves the cable's water pressure resistance and structural stability, and extends its service life.
Smart Images
Figure CN121366758A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of cables, and particularly relates to a 8MPa water pressure resistant polytetrafluoroethylene insulated longitudinal water-tight cable. BACKGROUND
[0002] With the rapid advancement of ocean oil and gas development, deep sea exploration and submarine communication network construction, the performance requirements of deep sea operation on submarine cables are increasingly stringent. Not only do they need to withstand 8MPa and above deep sea water pressure for a long time, but also need to maintain structural integrity during underwater laying and recovery to avoid mechanical damage caused by unbalanced buoyancy. At present, as a key transmission carrier for deep sea operation, the safety of submarine cables during laying and recovery directly determines the efficiency and cost of the entire project, and buoyancy balance is a core factor affecting the safety of laying and recovery. In the prior art, the buoyancy adjustment of submarine cables generally relies on the combined scheme of "external counterweight + sectional type buoyancy tank": before laying, the required buoyancy is calculated according to the target sea depth, the overall buoyancy is reduced by installing cast iron counterweights on the outside of the cable at intervals, or the buoyancy is increased by hanging sectional type rubber buoyancy tanks, so that the gravity and buoyancy of the cable reach the preset balanced state; during laying, the cable is slowly lowered by the winch system of the laying ship, and the ROV is used for auxiliary guidance to ensure that the cable is laid along the preset path; during recovery, the cable is lifted by the winch, and the ROV is used to clean the silt and organisms attached to the surface of the cable, and then the cable is wound onto the deck. The prior art has the following disadvantages: The buoyancy of the cable is fixed by the counterweight or the buoyancy tank before laying, and cannot be adaptively adjusted with the water depth. During lowering, if the initial buoyancy is insufficient (such as in shallow water, the seawater resistance is small, and the counterweight is too heavy), the gravity of the cable is much greater than the buoyancy (Gtotal-Ffloat≈2-5N / m), and the winch is prone to form local excessive dragging due to "gravity pulling down" and "seabed friction resistance" during lowering; During recovery, when the cable is recovered to the shallow water area, the seawater resistance is significantly reduced. If the winch suddenly slows down due to insufficient stacking space on the deck, the cable will bounce upward due to inertial force and "shallow water-deep water buoyancy difference" (the seawater density is slightly lower in shallow water, and the buoyancy is relatively high), and the bounce height can reach 20-50cm. The cable will collide with the edge of the laying ship deck or the cable guide frame, causing the outer sheath to wear. SUMMARY
[0003] In order to overcome the above-mentioned defects, the application provides a 8MPa water pressure resistant polytetrafluoroethylene insulated longitudinal water-tight cable, which solves the technical problems proposed in the background art.
[0004] In order to achieve the above object, the present application provides the following technical scheme: a kind of polytetrafluoroethylene insulated longitudinal watertight cable with water pressure resistance 8MPa, including cable main body, the cable main body adopts polytetrafluoroethylene insulation layer and outer layer integrally formed with longitudinal watertight sheath, the cable main body outer side is evenly distributed with multiple sets of limiting block, the limiting block is buckled with regular hexagon fixed block in, the fixed block bottom is fixedly connected with clamping block, the cable main body outer side is extruded with the clamping block used with clamping groove, the fixed block is formed with the cable main body outer side with the clamping groove by the clamping block of bottom axial limit; The bottom of the fixed block is fixed with a bottom block, and a plurality of extrusion springs are arranged on the top of the bottom block. The top of the extrusion spring is connected with a movable piece, and the movable piece is in sliding sealing cooperation with the inner wall of the fixed block. The fixed block is embedded with a gas storage bag, which is located outside the extrusion spring. A plurality of air inlet and outlet pipes are connected to the outside of the gas storage bag. A plurality of backflow blocks are fixedly arranged on the outside of the fixed block. The other end of the air inlet and outlet pipe is located inside the backflow block. An extrusion spring is fixedly connected to the inside of the backflow block. The other end of the extrusion spring is fixedly installed with a movable block. The movable block is in sliding connection with the inner wall of the backflow block.
[0005] As a further scheme of the present application: the gas storage bag is made of weather-resistant fluorine rubber material, and a gas filling pipe with a one-way valve is connected to the inside of the gas storage bag. A through hole is formed in the side wall of the fixed block. The air inlet and outlet pipe passes through the through hole and is provided with a sealing ring between the hole wall.
[0006] As a further scheme of the present application: a protrusion is arranged on the outside of the fixed block, and a limiting groove matching the protrusion is formed in the limiting block.
[0007] As a further scheme of the present application: the backflow block is integrally formed with the fixed block, and the rigidity of the extrusion spring is greater than that of the extrusion spring.
[0008] Compared with the prior art, the present application has the following advantages: By setting the movable piece, the extrusion spring, the gas storage bag and the backflow block in linkage, the buoyancy is automatically adjusted with the water pressure, forming a mechanical linkage mechanism from water pressure driving to gas flow and finally to volume adjustment. When laying and diving, the seawater pressure pushes the movable piece to extrude the spring inward, the gas in the gas storage bag is pressed into the backflow block, the volume of the liquid displaced by the cable is reduced, the buoyancy is automatically reduced with the increase of water pressure, the excessive dragging and bending damage are avoided, the extrusion spring and the extrusion spring (rigidity greater than the spring) are reset when recovering and floating up, the gas is pushed back to the gas storage bag, the volume of the liquid displaced is increased, the buoyancy is gradually increased, the shallow water area is prevented from bouncing and colliding, the overall structure does not need external power, and the dependence on counterweight and floating bag is eliminated, solving the damage problem caused by unbalanced buoyancy in the prior art. The interaction between the fixing block and the compression spring can disperse the water pressure, further enhance the compressive strength of the cable body, and prevent local stress concentration. Attached Figure Description
[0009] Figure 1 This is a first-view schematic diagram of the overall structure of the present invention; Figure 2 This is a second-view schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the cable body of the present invention; Figure 4 This is a first-view schematic diagram showing the overall structural cross-section of the present invention; Figure 5 For the present invention Figure 4 A magnified view of a portion of point A in the middle; Figure 6 This is a second-view schematic diagram showing the overall structural cross-section of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the extrusion spring of the present invention.
[0010] In the diagram: 1. Cable body; 2. Fixing block; 3. Base block; 4. Compression spring; 5. Movable piece; 6. Air reservoir; 7. Inflation tube; 8. Inlet and outlet air tubes; 9. Return block; 10. Compression spring; 11. Movable block; 12. Protrusion; 13. Limiting block; 14. Locking block; 15. Locking groove; 16. Limiting groove; 17. Through hole. Detailed Implementation
[0011] The technical solution of this patent will be further described in detail below with reference to specific embodiments.
[0012] like Figures 1-7 As shown, the present invention provides a technical solution: A water-tight cable with a water pressure resistance of 8MPa and polytetrafluoroethylene propylene insulation includes a cable body 1. The cable body 1 is made of polytetrafluoroethylene propylene insulation layer and has an integrally formed longitudinal water-tight sheath. Multiple sets of limiting blocks 13 are evenly distributed on the outer circumference of the cable body 1. A regular hexagonal fixing block 2 is snapped into the limiting block 13. A locking block 14 is fixedly connected to the bottom of the fixing block 2. A locking groove 15 for use with the locking block 14 is extruded on the outer side of the cable body 1. The fixing block 2 forms an axial limit through the locking block 14 at the bottom and the locking groove 15 on the outer side of the cable body 1. A bottom block 3 is fixed inside the fixed block 2. Multiple sets of compression springs 4 are provided on the top of the bottom block 3. A movable piece 5 is connected to the top of the compression spring 4. The movable piece 5 slides and seals with the inner wall of the fixed block 2. The fixed block 2 is embeddedly connected with a gas storage bag 6, the gas storage bag 6 is located outside the extrusion spring 4, a plurality of groups of air inlet and outlet pipes 8 are arranged in communication outside the gas storage bag 6, a plurality of groups of backflow blocks 9 are fixedly arranged outside the fixed block 2, the other ends of the air inlet and outlet pipes 8 are located inside the backflow blocks 9, extrusion springs 10 are fixedly connected inside the backflow blocks 9, movable blocks 11 are fixedly installed at the other ends of the extrusion springs 10, and the movable blocks 11 are slidably connected with the inner walls of the backflow blocks 9; Specifically, during use, during the diving process, as the water depth increases, the seawater pressure gradually increases and acts on the movable piece 5 and the movable block 11, the movable piece 5 slides inward under the water pressure and extrudes the spring 4, at the same time, the gas inside the fixed block 2 is pressed into the gas storage bag 6 through the air inlet and outlet pipe 8, and the movable block 11 is compressed inward under the pressure, further assisting the gas to converge to the gas storage bag 6, thereby realizing the self-adaptive reduction of the buoyancy with the increase of the water pressure by reducing the overall volume, and avoiding the attitude loss caused by the excessive buoyancy during diving; During the floating process, the water depth decreases, the seawater pressure decreases, the elastic force of the extrusion spring 4 and the extrusion spring 10 drives the movable piece 5 and the movable block 11 to reset, the gas in the gas storage bag 6 flows back to the inside of the fixed block 2 and the backflow block 9 through the air inlet and outlet pipe 8, thereby realizing the gradual increase of the buoyancy with the decrease of the water pressure by increasing the overall volume, preventing the bounce collision caused by the sudden increase of the buoyancy during floating, and ensuring that the fixed block 2 and the components are stably connected to the cable main body 1 under the impact of water flow and pressure change through the buckle connection of the limiting block 13 and the fixed block 2, the axial limiting cooperation of the clamping block 14 and the clamping groove 15, the insulating performance and longitudinal water tightness of the perfluoroethylene propylene insulating layer and the longitudinal water tightness sheath; The overall structure realizes the dynamic adjustment of the buoyancy through mechanical linkage, without the need for external power to adapt to different water depth pressures, thereby improving the water pressure resistance and structural stability of the cable in an 8MPa water pressure environment, solving the laying and recovery damage problems caused by the fixed buoyancy of the traditional cable, and facilitating the assembly and maintenance of the modular fixed block 2, thereby significantly prolonging the underwater service life and operation safety of the cable; The gas storage bag 6 is made of weather-resistant fluororubber material, a gas charging pipe 7 with a one-way valve is arranged in communication inside the gas storage bag 6, a through hole 17 is formed in the side wall of the fixed block 2, a sealing ring is arranged between the air inlet and outlet pipe 8 and the hole wall through the through hole 17, a protrusion 12 is arranged outside the fixed block 2, a limiting groove 16 matched with the protrusion 12 is formed in the limiting block 13, the backflow block 9 is integrally formed with the fixed block 2, and the rigidity of the extrusion spring 10 is greater than that of the extrusion spring 4; Specifically, the gas storage bag 6 is made of weather-resistant fluororubber material, which can ensure good sealing performance and structural stability in the long-term seawater erosion and pressure change environment, the gas charging pipe 7 with a one-way valve can conveniently pre-charge the gas storage bag 6 with a specified pressure of gas and avoid reverse leakage of the gas, the through hole 17 in the side wall of the fixed block 2 cooperates with the sealing ring, which not only ensures the smooth arrangement of the air inlet and outlet pipe, but also prevents seawater from entering the inside of the fixed block 2, thereby improving the overall water tightness. The protrusion 12 on the outside of the fixing block 2 is adapted to the limiting groove 16 in the limiting block 13, which further enhances the circumferential limiting effect of the fixing block 2 and the cable body 1, preventing the components from rotating and shifting under the impact of water flow. The return block 9 and the fixing block 2 are integrally formed to ensure structural strength and can withstand the impact of gas return under deep water pressure. This ensures that the buoyancy adjustment is precise and controllable, the connection of each component is stable, and the watertight performance is reliable throughout the entire process from pre-inflation preparation to deep water operation and recovery under 8MPa water pressure. This simplifies the preliminary preparation operation, improves the safety and durability of underwater operation, and effectively extends the service life of the cable. The working principle of this invention is as follows: First, during the cable laying and lowering phase, as the water depth increases, the seawater pressure increases synchronously and acts on the movable piece 5 within the fixed block 2 and the movable block 11 within the return block 9. The compression spring 10, with a stiffness greater than that of the compression spring 4, maintains a constant air pressure between the return block 9 and the air reservoir 6 in the initial state, laying a stable foundation for buoyancy adjustment. Subsequently, the movable piece 5 slides inward under water pressure, compressing the spring 4 and forcing the gas in the air reservoir 6 through the inlet and outlet pipes into the return block 9. This reduces the total amount of gas inside the air reservoir 6 and the fixed block 2, thus reducing the electrical... As the volume of liquid displaced by the cable decreases, the buoyancy decreases synchronously when the density and gravity of the seawater remain constant. This avoids excessive dragging and bending damage during laying caused by the fixed buoyancy in existing technologies. At the same time, the coordinated pressure of the movable piece 5 and the spring piece can disperse the water pressure, further enhancing the pressure resistance and preventing local stress concentration. Meanwhile, the regular hexagonal fixing block 2, through the double cooperation of the protrusion 12 and the limiting block 13, the limiting groove 16, the locking block 14 and the cable locking groove 15, ensures the circumferential and axial stability of the component, and eliminates attitude deviation and local stress concentration caused by uneven buoyancy. Secondly, as the water pressure gradually decreases during the recovery phase, the elastic force of the compression spring 4 pushes the movable piece 5 to reset. At the same time, the compression spring 10, due to its greater stiffness, can assist in pressing the gas in the return block 9 back into the air storage bladder 6, achieving bidirectional and stable gas flow. This gradually increases the volume of liquid displaced by the cable and gradually increases the buoyancy, effectively solving the secondary damage caused by the interaction between fixed buoyancy and tension during traditional cable recovery. Especially in shallow water areas, the slow increase in buoyancy can offset the difference between inertia and buoyancy, preventing the cable from colliding with the edge of the laying vessel or the guide frame. Finally, the dynamic adjustment of buoyancy is achieved through the mechanical linkage of water pressure drive and elastic reset. This not only specifically solves the core problems of insufficient buoyancy and attitude deviation during laying, as well as secondary damage and bouncing in shallow water during retrieval in existing technologies, but also strengthens the cable's compressive strength through the structure of movable piece 5 and extrusion spring piece 4. Combined with polytetrafluoroethylene propylene insulation layer and longitudinal watertight sheath, the underwater operation safety and service life of the cable are significantly improved while ensuring insulation and watertight performance.
[0013] While the preferred embodiments of the application have been described above, it will be understood that many modifications and variations will be apparent to those skilled in the art, which do not depart from the novel concepts of the present application. Such variations are not to be regarded as a departure from the spirit and scope of the application, and all such modifications as would be apparent to one skilled in the art are intended to be included within the scope of the following claims.
Claims
1. A polyfluoroethylene propylene insulated longitudinal watertight cable resistant to a water pressure of 8 MPa, characterized in that, Include: The cable body (1) adopts polytetrafluoroethylene insulation layer and the outer layer is integrally formed with longitudinal watertight sheath, the cable body (1) outer side is uniformly distributed with multiple sets of limiting block (13), the limiting block (13) is connected with the positive hexagonal fixed block (2) in the buckle, the fixed block (2) bottom is fixedly connected with the clamping block (14), the cable body (1) outer side is extruded with the clamping groove (15) used for the clamping block (14), the fixed block (2) is formed through the bottom clamping block (14) and the clamping groove (15) on the outer side of the cable body (1) axial limit; The bottom block (3) is fixed in the fixed block (2), a plurality of extrusion springs (4) are arranged on the top of the bottom block (3), the movable piece (5) is connected to the top of the extrusion spring (4), and the movable piece (5) is in sliding sealing cooperation with the inner wall of the fixed block (2); The gas storage bag (6) is embeddedly connected in the fixed block (2), the gas storage bag (6) is located outside the extrusion spring (4), a plurality of air inlet and outlet pipes (8) are communicated on the outer side of the gas storage bag (6), a plurality of backflow blocks (9) are fixedly arranged on the outer side of the fixed block (2), one end of the air inlet and outlet pipe (8) is located inside the backflow block (9), the extrusion spring (10) is fixedly connected to the inner side of the backflow block (9), the movable block (11) is fixedly installed at the other end of the extrusion spring (10), and the movable block (11) is in sliding connection with the inner wall of the backflow block (9).
2. The water pressure resistant 8 MPa polytetrafluoroethylene ethylene insulating longitudinal water-tight cable according to claim 1, characterized in that: The gas storage bag (6) is made of weather-resistant fluorine rubber material, a gas filling pipe (7) with a one-way valve is arranged in the inner side of the gas storage bag (6), the through hole (17) is formed in the side wall of the fixed block (2), and the air inlet and outlet pipe (8) passes through the through hole (17) and is provided with a sealing ring between the hole wall.
3. The water pressure resistant 8 MPa polytetrafluoroethylene ethylene insulating longitudinal water-tight cable according to claim 1, characterized in that: The fixed block (2) is provided with a protrusion (12) on the outer side, and the limiting slot (16) matched with the protrusion (12) is formed in the limiting block (13).
4. The water pressure resistant 8 MPa polytetrafluoroethylene ethylene insulating longitudinal water-tight cable according to claim 1, characterized in that: The backflow block (9) is integrally formed with the fixed block (2), and the rigidity of the extrusion spring (10) is greater than that of the extrusion spring (4).