Sleeve type bending limiter convenient to disassemble

Abstract

The invention discloses a sleeve type bending limiting device convenient to disassemble, and relates to the technical field of ocean pipe cable protection equipment. The bending limiter comprises a plurality of bending limiting units and a plurality of sleeves, and the adjacent bending limiting units are connected through the sleeves; the bending limiting units are used for containing ocean pipe cables, and the ends of the bending limiting units are provided with connectors. The sleeves comprise a first sleeve and a second sleeve, one sides of the first sleeve and the second sleeve are connected through a connecting piece, and the other sides of the first sleeve and the second sleeve are connected through a bolt; and clamping grooves are formed in the first sleeve and the second sleeve. The bending limiting unit is matched with the sleeve, bending deformation of the bending limiting device is achieved through movement of the connector in the clamping groove, the bending moment of the ocean pipe cable is transferred, the stress concentration condition of the bending limiting device is remarkably optimized, the protection performance of the ocean pipe cable in the complex seabed environment is enhanced, and the service life of the ocean pipe cable is prolonged. And in addition, disassembly and replacement are convenient when faults occur in the service process, and later maintenance is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of marine cable protection equipment, and in particular to a sleeve-type bending limiter which is easy to disassemble. Background Art

[0002] Bend limiters are important protective devices for marine cables and are usually used in the span area of ​​submarine cables and stress concentration locations. They reduce bending damage to submarine cables by effectively transferring bending moments. However, due to the complex and changeable marine environment, current bend limiters are susceptible to collisions, long-term scouring, etc., and are prone to local stress concentration, damage, and breakage. In addition, the failure rate of existing bend limiters during service is as high as 50%, and a large number of bend limiters need to be repaired and replaced in wind farms every year. However, at present, after a bend limiter fails, all bend limiters behind the fault point need to be removed before replacement, or repair devices need to be designed for different bend limiters, which greatly increases the time and economic cost of later construction and maintenance.

[0003] Chinese patent document CN116565796A discloses a quickly replaceable bend limiter and a submarine cable laying system and installation method, including a bend limiter body, a first connector and a second connector, one end of the bend limiter body is provided with a clamping ring, and the other end is provided with an embracing ring, any two adjacent bend limiter bodies are connected in sequence along the axial direction, and one of the embracing rings is sleeved and fixed on the outside of the clamping ring. The document adds several connectors to the middle section of the submarine cable bend limiter, so that when the bend limiter body is partially damaged, it is not necessary to completely dismantle the damage point, so that the original structure can be used to the greatest extent, reducing the difficulty of maintenance. However, the structure of the bend limiter body, connectors, etc. in the patent document is still relatively complicated, resulting in high production costs, cumbersome disassembly, and difficult maintenance. In addition, it fails to structurally change or optimize the force mechanism, and there is still a high risk of breakage at the suspended span of the submarine cable under seawater erosion. Summary of the invention

[0004] In view of the problem that the current bending limiter has a complex structure, resulting in high production costs and cumbersome disassembly, and the span is prone to breakage under seawater erosion due to the failure to change or optimize the force mechanism in the structure, the present invention provides a sleeve-type bending limiter that is easy to disassemble.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A sleeve-type bending limiter that is easy to disassemble includes a plurality of bending limit units and a plurality of sleeves, each of the bending limit units is arranged along the axial direction, and the adjacent bending limit units are connected by the sleeves. The bending limit units are used to accommodate marine pipe cables, and the ends of each of the bending limit units have a connector. The sleeve includes a first sleeve and a second sleeve, and the first sleeve is connected to the second sleeve on one side by a connecting piece, and the other side is connected by a bolt. The first sleeve and the second sleeve both have a slot that is compatible with the connector, and the adjacent limiting units are locked by the sleeves, and the connector is used to move in the slot to achieve bending deformation, which is used to transfer the bending moment of the marine pipe cable.

[0006] Furthermore, the bending limiting unit includes a first bending limiting unit and a second bending limiting unit, the first bending limiting unit is adjacent to the second bending limiting unit, and the sleeve is sleeved on one side end of the first bending limiting unit and the second bending limiting unit.

[0007] Furthermore, the cross-sections of the first sleeve and the second sleeve are both semicircular, and the first sleeve and the second sleeve are both provided with a first card slot on the left side and a second card slot on the right side. A card block is provided between the first card slot and the second card slot in the first sleeve, and a card block is also provided between the first card slot and the second card slot in the second sleeve.

[0008] Further, the first bending limiting unit has a first connecting head, and the second bending limiting unit has a second connecting head. The first connecting head is configured in the first slot, and the second connecting head is configured in the second slot.

[0009] Furthermore, there is a gap between the first connector and the first slot, and there is a gap between the second connector and the second slot.

[0010] Furthermore, the connecting head is formed by radially outwardly extending edges at both ends of the first bending limiting unit and the second bending limiting unit.

[0011] Further, the first bending limiting unit includes a first subunit and a second subunit, the cross-sections of the first subunit and the second subunit are both semicircular, and the first subunit and the second subunit are correspondingly matched to form a circular tube. The second bending limiting unit includes a third subunit and a fourth subunit, the cross-sections of the third subunit and the fourth subunit are both semicircular, and the third subunit and the fourth subunit are correspondingly matched to form a circular tube.

[0012] Further, the connecting member includes a first connecting member and a second connecting member, the first connecting member includes a first arc-shaped plate and a convex block, the convex block is fixed to one end of the first arc-shaped plate, and the other side of the first arc-shaped plate is connected to the first sleeve by a bolt. The second connecting member includes a second arc-shaped plate and a concave block, the concave block is fixed to one end of the first arc-shaped plate, and the other side of the first arc-shaped plate is connected to the second sleeve by a bolt.

[0013] Furthermore, the convex block and the concave block both have a through hole, and the convex block and the concave block are adaptively connected via a pin shaft and a locking nut.

[0014] Furthermore, the sleeve and the bending limiting unit are both made of polyurethane material.

[0015] The beneficial effects of the present invention are as follows: the present invention cooperates with the bend limiter unit and the sleeve, and utilizes the connector to move in the slot to achieve bending deformation of the bend limiter, which is used to transfer the bending moment of the marine pipe and cable, significantly optimizes the stress concentration of the bend limiter, and enhances the protection performance of the marine pipe and cable in a complex seabed environment. In the present invention, the first sleeve and the second sleeve are connected by a connector and bolts, which is convenient for later maintenance and disassembly, and when a failure occurs, only fixed-point disassembly and replacement are required, which simplifies the disassembly and assembly steps, greatly saves construction time and cost, and significantly improves maintenance efficiency. The present invention reduces the failure rate of the bend limiter during in-service by changing its mechanical principle, improves the convenience and economy of later construction and maintenance, and enhances the reliability of long-term stable operation in a complex marine environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a schematic diagram of the structural principle of an embodiment of the present invention.

[0017] Figure 2 Shown Figure 1 Top view of the .

[0018] Figure 3 Shown Figure 2 Cross-sectional view at point A in the middle.

[0019] Figure 4 Shown Figure 3 Side view of .

[0020] Figure 5 Shown is a schematic structural diagram of the first subunit.

[0021] Figure 6 Shown is a schematic structural diagram of the first sleeve.

[0022] Figure 7 Shown is a schematic diagram of the structure of the connecting parts.

[0023] Figure 8 for Figure 7 A partial structural diagram of the embodiment shows the connection relationship between the convex block and the concave block.

[0024] Explanation of the accompanying drawings: 1. first bending limit unit; 2. second bending limit unit; 3. sleeve; 4. first subunit; 5. third subunit; 6. first sleeve; 7. first connector; 8. second connector; 9. first slot; 10. second slot; 11. block; 12. first arc plate; 13. protrusion; 14. second arc plate; 15. concave block. DETAILED DESCRIPTION

[0025] The present invention discloses a sleeve-type bending limiter which is easy to disassemble. An implementation manner of the present invention is described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1 As shown, the bending limiter includes a plurality of bending limit units and a plurality of sleeves 3. Each bending limit unit and sleeve 3 are made of polyurethane material, have high wear resistance and impact resistance, and can adapt to long-term external pressure and seawater erosion in the seabed environment. Each bending limit unit is arranged axially, and adjacent bending limit units are connected by sleeves 3. The bending limit unit includes a first bending limit unit 1 and a second bending limit unit 2, and the first bending limit unit 1 is adjacent to the second bending limit unit 2. In this embodiment, the structures of the first bending limit unit 1 and the second bending limit unit 2 are the same. The end edges at both ends of the first bending limit unit 1 extend radially outward to form a first connector 7, and the end edges at both ends of the second bending limit unit 2 extend radially outward to form a second connector 8. The first bending limit unit 1 includes a first subunit 4 and a second subunit. The cross-sections of the first subunit 4 and the second subunit are both semicircular, and the first subunit 4 and the second subunit cooperate to form a circular tubular structure for accommodating marine cables. The second bending limiting unit 2 includes a third subunit 5 and a fourth subunit, the cross-sections of the third subunit 5 and the fourth subunit are both semicircular, and the third subunit 5 and the fourth subunit cooperate to form a circular tubular structure for accommodating marine cables. The structures of the first subunit 4, the second subunit, the third subunit 5 and the fourth subunit are the same.

[0027] The sleeve 3 includes a first sleeve 6 and a second sleeve, both of which are semicircular and have the same structure. A first slot 9 is provided on the left side of the first sleeve 6, a second slot 10 is provided on the right side, and a block 11 is provided between the first slot 9 and the second slot 10 in the first sleeve 6. A first slot 9 is provided on the left side of the second sleeve, a second slot 10 is provided on the right side, and a block 11 is provided between the first slot 9 and the second slot 10 in the second sleeve. The first sleeve 6 and the second sleeve are detachably connected to form a tubular structure through a connector, and the first sleeve 6 and the second sleeve are matched and sleeved on one side end of the first bending limiting unit 1 and the second bending limiting unit 2, wherein the first slot 9 in the first sleeve 6 corresponds to the first slot 9 in the second sleeve to form an annular slot, and the second slot 10 in the first sleeve 6 corresponds to the second slot 10 in the second sleeve to form an annular slot. The first connector 7 is arranged in the first slot 9, and the second connector 8 is arranged in the second slot 10. There is a gap between the first connector 7 and the inner wall of the first slot 9, so that the first connector 7 can move and rotate in a small range in the first slot 9. There is a gap between the second connector 8 and the inner wall of the second slot 10, so that the second connector 8 can move and rotate in a small range in the second slot 10.

[0028] Bolt holes are provided on one side of the first sleeve 6 and the second sleeve, and the first sleeve 6 is connected to the second sleeve by bolts, washers and anti-loosening nuts. The other sides of the first sleeve 6 and the second sleeve are connected by a connecting member, and the connecting member includes a first connecting member and a second connecting member, and the first connecting member includes a first arc plate 12 and a convex block 13, and the convex block 13 is fixed to one end of the first arc plate 12, and the other side of the first arc plate 12 is connected to the first sleeve 6 by bolts. The second connecting member includes a second arc plate 14 and a concave block 15, and the concave block 15 is fixed to one end of the second arc plate 14, and the other side of the second arc plate 14 is connected to the second sleeve by bolts. The convex block 13 and the concave block 15 both have through holes, and the convex block 13 and the concave block 15 are inserted into the through holes by a pin shaft, and the convex block 13 and the concave block 15 are fastened by fixing the anti-loosening nut on one end of the pin shaft.

[0029] During installation, the first subunit 4 and the second subunit of the first bending limiter unit 1 are symmetrical along the central axis, and are correspondingly assembled to form a circular tubular structure. The circular tubular structure has a receiving channel and is sleeved outside the marine umbilical cable. The aperture of the receiving channel is slightly larger than the diameter of the marine umbilical cable, so as to avoid friction and wear between the first subunit 4 and the second subunit and the marine umbilical cable. The third subunit 5 and the fourth subunit of the second bending limiter unit 2 are symmetrical along the central axis, and are correspondingly assembled to form a circular tubular structure. The circular tubular structure has a receiving channel and is sleeved outside the marine umbilical cable. The aperture of the receiving channel is slightly larger than the diameter of the marine umbilical cable, so as to avoid friction and wear between the third subunit 5 and the fourth subunit and the marine umbilical cable. The receiving channel can ensure the stability and flexibility of the marine umbilical cable within the normal bending range, allowing the marine umbilical cable to bend moderately when subjected to force, and not exceeding the designed bending radius of the bending limiter. The first sleeve 6 is connected to the second sleeve correspondingly and is sleeved on one side end of the first bending limiting unit 1 and the second bending limiting unit 2, so that the first connector 7 is arranged in the first clamping groove 9, and the second connector 8 is arranged in the second clamping groove 10. The first sleeve 6 and the second sleeve are provided with a clamping block 11, which can avoid contact between the first bending limiting unit 1 and the second bending limiting unit 2 and provide positioning support, ensure good adaptability between the components, and can effectively transfer the stress generated by the bending of the marine cable to the sleeve 3 to prevent the marine cable from being excessively bent. At the same time, the sleeve 3 has sufficient strength to ensure stability in long-term use.

[0030] One side of the first sleeve 6 has a screw hole, and the first arc plate 12 fits along the arc surface of the outer wall of the first sleeve 6, and is fixedly connected to the first sleeve 6 by bolts, washers and lock nuts. One side of the second sleeve has a screw hole, and the second arc plate 14 fits along the arc surface of the outer wall of the second sleeve, and is fixedly connected to the second sleeve by bolts, washers and lock nuts. The convex block 13 is adapted to be inserted into the concave block 15, and the convex block 13 and the concave block 15 both have a through hole for the pin to pass through and are coaxial. The convex block 13 forms a hinge structure between the pin and the concave block 15, and the convex block 13 can rotate relative to the concave block 15. One end of the pin has a pin head with a diameter larger than the through hole, and the other end has a lock nut, and the lock nut is used to ensure that the hinge structure will not loosen during long-term use. In this embodiment, the pin is made of corrosion-resistant alloy steel material, which can resist corrosion and vibration for a long time. A first rectangular limit block is fixed at a position adjacent to the protrusion 13 on the outer wall of the first sleeve 6, and a second rectangular limit block is fixed at a position adjacent to the recess 15 on the outer wall of the second tower. The first limit block and the second limit block cooperate to limit the opening and closing angle of the hinge structure, prevent the hinge structure from exceeding a specified angle when opening and closing, and assist in aligning the first sleeve 6 and the second sleeve when closing.

[0031] When the bend limiting units and sleeves 3 need to be maintained or replaced, the first sleeve 6 and the second sleeve can be opened on one side by unscrewing the anti-loosening nuts on the first sleeve 6 and the second sleeve, and the hinge structure can be used to rotate them to separate them from the bend limiting units. The staff can replace the bend limiting units or sleeves 3 without disassembling the bend limiting units around the fault location, which simplifies the disassembly steps, reduces the difficulty of operation, greatly improves the efficiency of loading and unloading, and ensures the long-term stable operation of the bend limiter on the seabed.

[0032] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A sleeve-type bending limiter that is easy to disassemble, characterized in that: The invention comprises a plurality of bend limiting units and a plurality of sleeves (3), wherein the bend limiting units are arranged along the axial direction, and adjacent bend limiting units are connected via the sleeves (3); the bend limiting units are used to accommodate marine pipe cables, and the ends of the bend limiting units are provided with connectors; the sleeves (3) comprise a first sleeve (6) and a second sleeve, wherein one side of the first sleeve (6) and the second sleeve are connected via a connector, and the other side is connected via bolts; the first sleeve (6) and the second sleeve are provided with a slot adapted to the connector, and adjacent bend limiting units are locked via the sleeves (3), and the connector is moved in the slot to achieve bending deformation, thereby transferring the bending moment of the marine pipe cable.

2. The easily disassembled sleeve-type bending limiter according to claim 1, characterized in that: The bending limiting unit comprises a first bending limiting unit (1) and a second bending limiting unit (2), the first bending limiting unit (1) being adjacent to the second bending limiting unit (2), and the sleeve (3) being sleeved on one side end of the first bending limiting unit (1) and the second bending limiting unit (2).

3. The easily disassembled sleeve-type bending limiter according to claim 2, characterized in that: The cross-sections of the first sleeve (6) and the second sleeve are both semicircular, and the first sleeve (6) and the second sleeve are both provided with a first slot (9) on the left side and a second slot (10) on the right side; A clamping block (11) is provided between the first clamping slot (9) and the second clamping slot (10) in the first sleeve (6), and a clamping block (11) is also provided between the first clamping slot (9) and the second clamping slot (10) in the second sleeve.

4. The easily disassembled sleeve-type bending limiter according to claim 3, characterized in that: The first bending limiting unit (1) has a first connecting head (7), and the second bending limiting unit (2) has a second connecting head (8); the first connecting head (7) is arranged in the first clamping groove (9), and the second connecting head (8) is arranged in the second clamping groove (10).

5. The easily disassembled sleeve-type bending limiter according to claim 4, characterized in that: There is a gap between the first connector (7) and the first slot (9), and there is a gap between the second connector (8) and the second slot (10).

6. The easily disassembled sleeve-type bending limiter according to claim 2, characterized in that: The connecting head is formed by radially outwardly extending edges at both ends of the first bending limiting unit (1) and the second bending limiting unit (2).

7. The easily disassembled sleeve-type bending limiter according to claim 2, characterized in that: The first bending limiting unit (1) comprises a first subunit (4) and a second subunit, the cross-sections of the first subunit (4) and the second subunit are both semicircular, and the first subunit (4) and the second subunit are correspondingly matched to form a circular tube; The second bending limiting unit (2) comprises a third subunit (5) and a fourth subunit, the cross-sections of the third subunit (5) and the fourth subunit are both semicircular, and the third subunit (5) and the fourth subunit are correspondingly matched to form a circular tube.

8. The easily disassembled sleeve-type bending limiter according to claim 1, characterized in that: The connecting member comprises a first connecting member and a second connecting member, the first connecting member comprises a first arc-shaped plate (12) and a protrusion (13), the protrusion (13) is fixed to one end of the first arc-shaped plate (12), and the other side of the first arc-shaped plate (12) is connected to the first sleeve (6) via a bolt; The second connecting member comprises a second arc-shaped plate (14) and a recessed block (15); the recessed block (15) is fixed to one end of the first arc-shaped plate (12); the other side of the first arc-shaped plate (12) is connected to the second sleeve via bolts.

9. The easily disassembled sleeve-type bending limiter according to claim 8, characterized in that: The convex block (13) and the concave block (15) both have a through hole, and the convex block (13) and the concave block (15) are adaptively connected via a pin shaft and a locking nut.

10. The easily disassembled sleeve-type bending limiter according to claim 1, characterized in that: The sleeve (3) and the bending limiting unit are both made of polyurethane material.

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