Marine pipeline buoyancy block device with discrete thread spherical convex teeth

Abstract

The invention discloses an ocean pipeline buoyancy block device with discrete thread spherical convex teeth, and belongs to the technical field of ocean engineering equipment. Specifically, the device comprises an inner buoyancy block, an outer buoyancy block and an auxiliary fixing and positioning device. The inner buoyancy block is limited in the outer buoyancy block and is fixed on a target ocean pipeline through an auxiliary fixing and positioning device, and spherical convex teeth which are dispersedly and spirally arranged are arranged on the outer surface of the outer buoyancy block. While the buoyancy supply function of the buoyancy block is kept, the spherical convex teeth which are dispersedly and spirally distributed on the surface of the outer buoyancy block can reduce the correlation degree of vortex falling in the pipe length direction, the vortex is promoted to fall off in advance to a certain degree, the vortex is broken, and therefore marine pipeline damage caused by vortex-induced vibration is relieved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engineering equipment, and in particular to a marine pipeline buoyancy block device with discrete threaded spherical convex teeth. Background Art

[0002] Marine pipelines are key infrastructure connecting submarine production systems, offshore platforms, and land terminals. Their stable operation is directly related to the efficiency of marine oil and gas field development and energy security. As a core auxiliary component of the marine pipeline system, buoyancy blocks can, on the one hand, provide buoyancy support, reduce the weight per unit length of the pipeline, and alleviate the load requirements on the anchoring and support system; on the other hand, they can optimize the spatial form of the pipeline, making it present a specific span curve, avoiding the friction, wear, and local buckling risks caused by direct contact with the seabed. However, the cylindrical outer surface of the existing buoyancy blocks is prone to induce the Karman vortex street phenomenon in the ocean flow field, causing vortex-induced vibration in the marine pipeline. Severe vibration will not only accelerate the fatigue failure of the buoyancy block's own connection structure, but also increase the dynamic bending stress of the marine pipeline, causing damage to the pipeline coating, local buckling, and even overall instability, seriously threatening the service life of the marine pipeline.

[0003] Both domestic and foreign countries are paying more and more attention to the vortex-induced vibration phenomenon induced by buoyancy blocks. In the existing technology, patents CN202311429966.2 and CN202411556370.3 respectively proposed a fixture-free buoyancy module and a distributed buoyancy module. Both have traditional smooth cylindrical shapes and do not take into account the vortex-induced vibration phenomenon caused by buoyancy blocks. Moreover, the adaptability of the two is poor and they cannot adapt to pipelines of different diameters. In addition, studies have pointed out that although the traditional spiral strake structure can break up vortices and reduce the relevant length of the vortex along the length direction, thereby suppressing vortex-induced vibration, its continuous spiral design may cause additional resistance. The buoyancy block with spiral strakes is complex to mold and difficult to install. The above-mentioned marine pipeline buoyancy block device has the following technical limitations: (1) Traditional cylindrical buoyancy blocks are prone to vortex-induced vibration, which leads to fatigue damage to marine pipelines and reduces the service life of marine pipelines; (2) The existing buoyancy device has poor applicability, and the entire mold needs to be redesigned when the pipeline size changes, which greatly increases the cost of use; (3) Traditional spiral strakes will cause additional resistance, and the buoyancy device with spiral strakes is complex to mold and difficult to manufacture. Summary of the Invention

[0004] The purpose of the present invention is to provide a marine pipeline buoyancy block device with discrete threaded spherical convex teeth. The spherical convex teeth with discrete spiral distribution on the surface of the outer buoyancy block can reduce the correlation degree of vortex shedding along the length of the pipe, promote the vortex to fall off in advance to a certain extent, and break up the vortex, thereby reducing the damage to the marine pipeline caused by vortex-induced vibration.

[0005] To achieve the above-mentioned objectives, the present invention provides a marine pipeline buoyancy block device with discrete threaded spherical teeth, including an outer buoyancy block and an inner buoyancy block, wherein the inner buoyancy block is limited inside the outer buoyancy block, and the inner limit of the inner buoyancy block is a marine pipeline, the end of the marine pipeline is connected to the offshore platform, and the outer surface of the outer buoyancy block is provided with spherical teeth arranged in a discrete spiral.

[0006] Preferably, the outer buoyancy block is an arc-shaped block, and the two end surfaces of the two outer buoyancy blocks are in contact and assembled together to form an inner hollow cylindrical block.

[0007] Preferably, both end faces of the outer buoyancy block are provided with an assembly hole 1, and a bolt 1 passes through the assembly hole 1 of the two assembled outer buoyancy blocks and is connected together with a nut 1; the specifications and positions of the two assembly holes 1 match.

[0008] Preferably, a positioning groove is provided in the middle of the inner wall of the outer buoyancy block, and a gradually expanding bell mouth is also provided on the inner wall of the outer buoyancy block, and two gradually expanding bell mouths are respectively located on both sides of the positioning groove.

[0009] Preferably, the positioning groove is arc-shaped, and the end with a smaller diameter of the gradually expanding bell mouth is connected to the inner circle of the arc-shaped end surface of the positioning groove.

[0010] Preferably, the positioning grooves of the two outer buoyancy blocks are assembled to form a cylindrical groove, and the two square end faces of the two inner buoyancy blocks are contacted and assembled together and confined in the cylindrical groove.

[0011] Preferably, the inner buoyancy block is an arc-shaped block, and the two square end surfaces of the two inner buoyancy blocks are each provided with a second assembly hole, and the second bolt passes through the second assembly holes of the two assembled inner buoyancy blocks and is connected together with a second nut, and the specifications and positions of the two second assembly holes match; The two square end faces of the two inner buoyancy blocks are contacted and assembled into a cylindrical block with a hollow interior. A cylindrical through hole is opened in the middle of the assembled inner buoyancy block, and the marine pipeline is limited inside the cylindrical through hole. The size of the cylindrical through hole matches the outer diameter of the marine pipeline.

[0012] Preferably, the outer surface of the spherical protruding teeth is coated with a fluoropolymer anti-biological adhesion coating, and the thickness of the fluoropolymer anti-biological adhesion coating is 50 μm-100 μm; the end with a larger diameter of the gradually expanding bell mouth is coated with a buffer coating, and the thickness of the buffer coating is 0.1 times to 0.15 times the inner diameter of the inner buoyancy block; The outer buoyancy block and the inner buoyancy block are made of polyurethane elastomer, and the spherical protruding teeth are made of polyurethane elastomer; the interior of the outer buoyancy block and the inner buoyancy block are filled with hollow microspheres, and the hollow microspheres occupy 60%-80% of the volume of the outer buoyancy block and the inner buoyancy block respectively.

[0013] Preferably, the cone angle of the gradually expanding bell mouth is 10°-20°.

[0014] Preferably, the surface of the outer buoyancy block is provided with three rows of spherical teeth arranged in a discrete spiral, the pitch of the spiral line of the spherical teeth is 1.2 times the outer diameter of the outer buoyancy block; the diameter of the spherical teeth is 0.15 times the outer diameter of the outer buoyancy block; the height of the spherical teeth protruding from the outer buoyancy block is 0.15 times-0.2 times the outer diameter of the outer buoyancy block.

[0015] The advantages and positive effects of the marine pipeline buoyancy block device with discrete threaded spherical convex teeth described in the present invention are: 1. The discrete spirally distributed spherical teeth set on the surface of the external buoyancy block can effectively break up the vortex, reduce the spanwise correlation of the vortex, and alleviate the damage to the marine pipeline caused by vortex-induced vibration.

[0016] 2. The outer buoyancy block is a universal module. By changing the size of the cylindrical through-hole of the inner buoyancy block, it can be adapted to marine pipelines of different diameters, eliminating the need for repeated mold opening of the outer buoyancy block and greatly saving costs.

[0017] 3. The spherical teeth, external buoyancy blocks and internal buoyancy blocks are made of polyurethane elastomer, which has the characteristics of light weight and better stability and reliability in deep-sea high-pressure environment.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a marine pipeline buoyancy block device with discrete threaded spherical convex teeth according to the present invention; Figure 2 This is a schematic diagram of the structure of the external buoyancy block of the present invention; Figure 3 This is a schematic diagram of the internal buoyancy block structure of the present invention; Figure 4 Schematic diagram of the assembly of the outer buoyancy block and the inner buoyancy block of the present invention; Figure 5 This is a schematic diagram of the disassembly of the marine pipeline buoyancy block of the present invention; Figure 6 This is a diagram showing the installation effect of the marine pipeline buoyancy block of the present invention.

[0020] Reference numerals 1. External buoyancy block; 11. Spherical convex teeth; 12. Assembly hole 1; 13. Bolt 1; 14. Nut 1; 15. Gradual expansion bell mouth; 16. Positioning groove; 2. Internal buoyancy block; 21. Assembly hole 2; 22. Bolt 2; 23. Nut 2; 3. Marine pipeline. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. In the event of any inconsistency, the meaning described in this specification or the meaning derived from the contents recorded in this specification shall prevail. In addition, the terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0023] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] like Figures 1-6 As shown, a marine pipeline buoyancy block device with discrete threaded spherical convex teeth includes an outer buoyancy block 1 and an inner buoyancy block 2. The inner buoyancy block 2 is limited inside the outer buoyancy block 1. The inner limit of the inner buoyancy block 2 is a marine pipeline 3. The outer surface of the outer buoyancy block 1 is provided with spherical convex teeth 11 arranged in a discrete spiral.

[0025] Specifically, the working principle of the spherical teeth 11 arranged in a discrete spiral can reduce vortex-induced vibration: by arranging the spherical teeth 11 distributed in a spiral array on the outer surface of the external buoyancy block 1, the spherical teeth 11 can effectively disrupt the vortex discharge around the marine pipeline 3, breaking the periodic shedding law of the traditional smooth surface Karman vortex street. According to the relevant theories of vortex shedding and structural vibration in fluid mechanics, when the vortex shedding frequency is close to the structural natural frequency of the marine pipeline 3, it is easy to induce resonance and cause large vibrations. The spherical teeth 11 can change the shedding vortex frequency and keep it away from the structural natural frequency, thereby effectively avoiding the marine pipeline 3 from generating a large amplitude due to resonance, thereby achieving the suppression of vortex-induced vibration.

[0026] The outer buoyancy block 1 is an arc-shaped block. The two end surfaces of the two outer buoyancy blocks 1 are in contact with each other and assembled together to form a cylindrical block with a hollow interior.

[0027] Both end faces of the outer buoyancy block 1 are provided with assembly holes 12, and bolts 13 pass through the assembly holes 12 of the two assembled outer buoyancy blocks 1 and are connected together with nuts 14; the specifications and positions of the two assembly holes 12 match.

[0028] Specifically, the assembly hole 12 passes through the two end surfaces of the outer buoyancy block 1 to the arc surface of the outer buoyancy block 1, and the radial fixation of the outer buoyancy block 1 is achieved by the bolt 13 and the nut 14.

[0029] A positioning groove 16 is provided in the middle of the inner wall of the outer buoyancy block 1 . The inner wall of the outer buoyancy block 1 is also provided with a gradually expanding bell mouth 15 . Two gradually expanding bell mouths 15 are respectively located on both sides of the positioning groove 16 .

[0030] The positioning groove 16 is in an arc shape, and the end with a smaller diameter of the gradually expanding bell mouth 15 is connected to the inner circle of the arc-shaped end surface of the positioning groove 16 .

[0031] Specifically, the gradually expanding bell mouth 15 realizes the axial limitation of the assembled inner buoyancy block 2.

[0032] The positioning grooves 16 of the two outer buoyancy blocks 1 are assembled to form a cylindrical groove, and the two square end faces of the two inner buoyancy blocks 2 are assembled together after contact and are confined in the cylindrical groove.

[0033] The inner buoyancy block 2 is an arc-shaped block. The two square end faces of the two inner buoyancy blocks 2 are both provided with assembly holes 21. The bolts 22 pass through the assembly holes 21 of the two assembled inner buoyancy blocks 2 and are connected together with nuts 23. The specifications and positions of the two assembly holes 21 match.

[0034] Specifically, the second assembly hole 21 passes through the two square end surfaces of the inner buoyancy block 2 to the arcuate surface of the inner buoyancy block 2 , and the radial fixation of the inner buoyancy block 2 is achieved by the second bolt 22 and the second nut 23 .

[0035] The two square end faces of the two inner buoyancy blocks 2 are contacted and assembled into a cylindrical block with a hollow interior. A cylindrical through hole is opened in the middle of the assembled inner buoyancy block 2, and the marine pipeline 3 is limited inside the cylindrical through hole. The size of the cylindrical through hole matches the size of the outer diameter of the marine pipeline 3.

[0036] The outer surface of the spherical teeth 11 is coated with a fluoropolymer anti-fouling coating with a thickness of 50 μm to 100 μm. The larger end of the gradually expanding bell mouth 15 is coated with a buffer coating with a thickness of 0.1 to 0.15 times the inner diameter of the inner buoyancy block 2.

[0037] The outer buoyancy block 1 and the inner buoyancy block 2 are made of polyurethane elastomer, and the spherical protruding teeth 11 are made of polyurethane elastomer; the interior of the outer buoyancy block 1 and the inner buoyancy block 2 are filled with hollow microspheres, which account for 60%-80% of the volume of the outer buoyancy block 1 and the inner buoyancy block 2 respectively.

[0038] Specifically, polyurethane elastomer has the characteristics of high pressure resistance and high buoyancy.

[0039] The cone angle of the gradually expanding bell mouth 15 is 10°-20°.

[0040] The surface of the outer buoyancy block 1 is provided with three rows of spherical teeth 11 arranged in a discrete spiral. The pitch of the spiral line of the spherical teeth 11 is 1.2 times the outer diameter of the outer buoyancy block 1; the diameter of the spherical teeth 11 is 0.15 times the outer diameter of the outer buoyancy block 1; the height of the spherical teeth 11 protruding from the outer buoyancy block 1 is 0.15 times-0.2 times the outer diameter of the outer buoyancy block 1.

[0041] The use process of the present invention is: Before installation, the reasonable arrangement and quantity of the outer buoyancy blocks 1 and the inner buoyancy blocks 2 are determined according to specific project requirements, and assembly positioning marks are set along the axial direction of the marine pipeline 3.

[0042] First, install the inner buoyancy blocks 2 along the ocean pipeline 3 according to the positioning marks. Two inner buoyancy blocks 2 are symmetrically placed over the ocean pipeline 3 at the predetermined locations, with their second mounting holes 21 aligned. Once this is complete, bolts 22 are inserted through the second mounting holes 21 and secured with nuts 23 to prevent axial movement of the inner buoyancy blocks 2 along the ocean pipeline 3.

[0043] Next, insert the installed inner buoyancy block 2 into the positioning groove 16 provided on the inner side of the outer buoyancy block 1 to achieve axial positioning of the inner buoyancy block 2. Once positioned, insert bolt 13 into two symmetrical assembly holes 12 and tighten nut 14 to secure the two outer buoyancy blocks 1. Finally, this step completes the assembly of multiple outer buoyancy blocks 1 and inner buoyancy blocks 2 on the marine pipeline 3.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A marine pipeline buoyancy block device with discrete threaded spherical convex teeth, characterized by: The invention comprises an outer buoyancy block and an inner buoyancy block. The inner buoyancy block is limited inside the outer buoyancy block. A marine pipeline is limited inside the inner buoyancy block. The outer surface of the outer buoyancy block is provided with spherical convex teeth arranged in a discrete spiral.

2. The marine pipeline buoyancy block device with discrete threaded spherical convex teeth according to claim 1, characterized in that: The outer buoyancy block is an arc-shaped block, and the two end surfaces of the two outer buoyancy blocks are in contact with each other and assembled together to form a cylindrical block with a hollow interior.

3. The marine pipeline buoyancy block device with discrete threaded spherical protruding teeth according to claim 2, characterized in that: Both end faces of the outer buoyancy block are provided with an assembly hole 1, and a bolt 1 passes through the assembly hole 1 of the two assembled outer buoyancy blocks and is connected together with a nut 1; the specifications and positions of the two assembly holes 1 match.

4. The marine pipeline buoyancy block device with discrete threaded spherical protruding teeth according to claim 3, characterized in that: A positioning groove is provided in the middle of the inner wall of the outer buoyancy block, and a gradually expanding bell mouth is also provided on the inner wall of the outer buoyancy block, and two gradually expanding bell mouths are respectively located on both sides of the positioning groove.

5. The marine pipeline buoyancy block device with discrete threaded spherical protruding teeth according to claim 4, characterized in that: The positioning groove is in an arc shape, and the end with a smaller diameter of the gradually expanding bell mouth is connected to the inner circle of the arc-shaped end surface of the positioning groove.

6. The marine pipeline buoyancy block device with discrete threaded spherical protruding teeth according to claim 5, characterized in that: The positioning grooves of the two outer buoyancy blocks are assembled to form a cylindrical groove, and the two square end faces of the two inner buoyancy blocks are contacted and assembled together and confined in the cylindrical groove.

7. The marine pipeline buoyancy block device with discrete threaded spherical protruding teeth according to claim 6, characterized in that: The inner buoyancy block is an arc-shaped block, and the two square end faces of the two inner buoyancy blocks are both provided with a second assembly hole. The second bolt passes through the second assembly holes of the two assembled inner buoyancy blocks and is connected together with a second nut. The specifications and positions of the two second assembly holes match each other. The two square end faces of the two inner buoyancy blocks are contacted and assembled into a cylindrical block with a hollow interior. A cylindrical through hole is opened in the middle of the assembled inner buoyancy block, and the marine pipeline is limited inside the cylindrical through hole. The size of the cylindrical through hole matches the outer diameter of the marine pipeline.

8. The marine pipeline buoyancy block device with discrete threaded spherical protruding teeth according to claim 7, characterized in that: The outer surface of the spherical protruding teeth is coated with a fluoropolymer anti-biological adhesion coating, and the thickness of the fluoropolymer anti-biological adhesion coating is 50-100 μm; the end with a larger diameter of the gradually expanding bell mouth is coated with a buffer coating, and the thickness of the buffer coating is 0.1 times to 0.15 times the inner diameter of the inner buoyancy block; The outer buoyancy block and the inner buoyancy block are made of polyurethane elastomer, and the spherical protruding teeth are made of polyurethane elastomer; the interior of the outer buoyancy block and the inner buoyancy block are filled with hollow microspheres, and the hollow microspheres occupy 60%-80% of the volume of the outer buoyancy block and the inner buoyancy block respectively.

9. The marine pipeline buoyancy block device with discrete threaded spherical protruding teeth according to claim 7, characterized in that: The cone angle of the gradually expanding bell mouth is 10°-20°.

10. The marine pipeline buoyancy block device with discrete threaded spherical protruding teeth according to claim 7, characterized in that: The surface of the outer buoyancy block is provided with three rows of spherical teeth arranged in a discrete spiral. The pitch of the spiral line of the spherical teeth is 1.2 times the outer diameter of the outer buoyancy block; the diameter of the spherical teeth is 0.15 times the outer diameter of the outer buoyancy block; the height of the spherical teeth protruding from the outer buoyancy block is 0.15 times-0.2 times the outer diameter of the outer buoyancy block.

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