Double-layer high-voltage-resistant low-rigidity flexible compensation device

Abstract

This invention discloses a double-layer high-pressure-resistant, low-stiffness flexible compensation device, comprising a left large flange, a right large flange, and a double-layer rubber tube body arranged between the left and right large flanges. The double-layer rubber tube body includes an outer rubber tube body and an inner rubber tube body. Both the outer and inner rubber tube bodies include n upper U-shaped bladders and (n-1) lower U-shaped bladders, which are arranged alternately, with the U-shaped cavities of the upper and lower U-shaped bladders arranged opposite each other. By using an inner and outer layer of rubber tube bodies connected in a nested configuration, seawater can be prevented from entering the outer rubber tube body when the inner rubber tube body is working. Even if the inner rubber tube body is damaged under extreme conditions, the outer rubber tube body can still function normally, preventing seawater from entering the ship's cabin through the outer rubber tube body, thus achieving a double-layer protection function and improving its protective capability under extreme conditions.

Description

Technical Field

[0001] This invention belongs to the technical field of flexible connectors for large-diameter pipelines, specifically relating to a double-layer, high-pressure-resistant, low-stiffness flexible compensation device. Background Technology

[0002] With the development and application of advanced technologies such as large floating rafts and airbag vibration isolation, the problem of the first channel of mechanical noise has been largely solved. However, controlling the transmission of vibration noise in the second channel has become a critical challenge, especially for submersible systems. Firstly, submersible systems have large-diameter flexible nozzles and operate at high pressures. Under deep-diving conditions, submersible pipelines need to withstand high seawater pressure, making their safety and reliability paramount. Damage to the pipes directly impacts equipment safety; therefore, large-diameter flexible nozzles must possess high reliability and secondary protection capabilities. Secondly, under conditions of seawater pressure fluctuations and external impacts, the pipeline system will tilt and sway, potentially causing malfunctions in the pipeline and its connecting equipment. Therefore, flexible nozzles must have high displacement compensation capabilities. Furthermore, the submersible pipeline is directly connected to the outer wall of the equipment. Existing submersible pipelines have high stiffness, which is mismatched with the stiffness of the low-frequency vibration isolation system, causing acoustic short-circuiting problems due to pipeline vibration and significantly reducing the equipment's vibration reduction performance. Therefore, flexible nozzles must possess low stiffness and good vibration reduction and noise reduction capabilities.

[0003] Among the existing flexible nozzle structures, the patents entitled "Three-Flange Structure Self-Balancing Flexible Nozzle" (Patent No.: CN200410012687.7), "A Balanced Arc-Shaped Pipe Joint with Large Displacement Compensation Capability" (Patent No.: CN200810196817.5), and "Multi-Surface Self-Balancing Low-Stiffness Rubber Hose" (Patent No.: CN201810757200.X) respectively propose self-balancing flexible nozzles, balanced arc-shaped pipe joints, and multi-surface self-balancing flexible nozzle structures. However, their working pressure is low, the diameter is small, and the stiffness is large, which cannot meet the requirements for vibration reduction and noise reduction of marine pipelines under high pressure (above 3MPa). Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide a double-layer high-pressure-resistant, low-stiffness flexible compensation device that is resistant to high pressure, low stiffness, highly reliable, and capable of large deformation.

[0005] To achieve the above objectives, the present invention provides a double-layer high-pressure-resistant, low-stiffness flexible compensation device, comprising a left large flange, a right large flange, and a double-layer rubber tube body arranged between the left and right large flanges; the double-layer rubber tube body comprises an outer tube rubber tube body and an inner tube rubber tube body, both of which include n upper U-shaped bladders and (n-1) lower U-shaped bladders, which are arranged alternately, and the U-shaped cavities of the upper and lower U-shaped bladders are arranged opposite to each other; the left end connection sections of both the outer and inner tube rubber tube bodies are connected and fixed to the left large flange via three flanges, and the right end connection sections of both the outer and inner tube rubber tube bodies are connected and fixed to the right large flange via three flanges.

[0006] Furthermore, the upper U-shaped bladder includes an upper horizontal section and upper arc segments at both ends of the upper horizontal section, and the lower U-shaped bladder includes a lower horizontal section and lower arc segments at both ends of the lower horizontal section. The upper arc segments of the upper U-shaped bladder and the lower arc segments of the lower U-shaped bladder are connected to each other. Moreover, the upper U-shaped bladders at both ends of the outer tube rubber tube and the inner tube rubber tube are connected to the end connecting section through the lower arc segments.

[0007] Furthermore, a large clamping ring is clamped on the outer edge of the upper U-shaped bladder, and a small clamping ring is clamped inside the U-shaped cavity of the lower U-shaped bladder; the large clamping ring is vulcanized into the upper U-shaped bladder, and the small clamping ring is vulcanized into the lower U-shaped bladder.

[0008] Furthermore, the central angle α of the upper arc segment is 90° to 180°, and the central angle γ of the lower arc segment satisfies γ = 90° + arcsin(r1sin(α-90°) / r2), where r1 is the outer radius of the upper arc segment and r2 is the outer radius of the lower arc segment; the length L of the upper horizontal segment of the upper U-shaped bladder satisfies S = nL, where S is the displacement compensation capability of the double-layer high pressure-resistant and low stiffness flexible compensation device.

[0009] Furthermore, the three flanges include an outer flange, an intermediate flange, an inner flange, and a bushing. Both the outer and inner rubber tubes are composed of an inner rubber layer, a skeleton layer, and an outer rubber layer. The inner rubber layers at the end connection sections of both the outer and inner rubber tubes are vulcanized integrally with the outer flange, and the inner rubber layers at the end connection sections of both the outer and inner rubber tubes are vulcanized integrally with the inner flange.

[0010] Furthermore, all inner flanges are L-shaped, and the transverse end face of the inner flange is a bevel. The angle β formed by the bevel and the outer circular surface of the upper arc segment is tangent to the central angle γ of the lower arc segment satisfies β+γ=180°.

[0011] Furthermore, the two ends of the small compression ring abut against the arc cavity of the lower arc segment at both ends of the lower U-shaped bladder.

[0012] Furthermore, the left and right large flanges, on the surfaces that contact the three flanges, are respectively provided with double-layer annular grooves, namely an outer annular groove and an inner annular groove. An annular O-ring is provided in the outer annular groove, and a PTC plug seal is provided in the inner annular groove.

[0013] Furthermore, both the outer and inner rubber tubes include n upper Ω-shaped bladders and (n-1) lower Ω-shaped bladders, which are arranged alternately, and the Ω-shaped cavities of the upper and lower Ω-shaped bladders are arranged opposite to each other.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1) The double-layer high-pressure-resistant and low-rigidity flexible compensation device adopts an inner and outer layer of rubber tubes connected together. When the inner rubber tube is working, it can prevent seawater from entering the outer rubber tube. Under extreme conditions, even if the inner rubber tube is damaged, the outer rubber tube can still work normally to prevent seawater from entering the ship's cabin from the outer rubber tube, thus achieving the function of double-layer protection and improving its protection capability under extreme conditions.

[0016] 2) An integrated three-flange structure is adopted, with the three flanges and the rubber hose body integrally molded to ensure good airtightness of the hose body; in order to further improve the airtightness at the flange connection position, a two-stage sealing structure is adopted. When the annular O-ring seal at the flange position fails, the high-pressure fluid is transferred to the PTC plug seal, which can achieve local self-sealing.

[0017] 3) Improve the pipe structure by adopting a series structure of multiple U-shaped bladders to effectively reduce the axial and radial stiffness of the pipe, which is beneficial to improving the vibration reduction capability of large-diameter flexible pipes under high pressure. Without reducing the reliability of the flexible pipe, the stiffness is reduced by more than 60% compared with metal corrugated pipes of the same specification.

[0018] 4) The double-layer high pressure resistance and low stiffness flexible compensation device of the present invention has the advantages of high pressure resistance, high reliability, large displacement compensation and strong vibration reduction performance, which can meet the requirements of ships for vibration reduction and noise reduction and high reliability of sea passage pipelines. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the double-layer high pressure resistance and low stiffness flexible compensation device of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the dual-stage sealing structure;

[0021] Figure 3 for Figure 1 Schematic diagram of the structure of the outer and inner rubber tubes;

[0022] Figure 4This is a schematic diagram of the parameters.

[0023] Among them, 1-left large flange, 2-outer flange, 3-middle flange, 4-bulb, 5-inner flange, 6-small clamping ring, 7-large clamping ring, 8-upper U-shaped bladder, 9-lower U-shaped bladder, 10-three flanges, 11-upper horizontal section, 12-outer rubber tube body, 13-right large flange, 14-lower arc section, 15-first double-ended stud, 16-end connection section, 17-second double-ended stud, 18-first bolt, 19-second bolt, 20-lower horizontal section, 21-outer annular groove, 22-inner annular groove, 23-upper arc section, 24-inner rubber tube body, 25-inner rubber layer, 26-skeleton layer, 27-outer rubber layer, 28-sloping surface. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] like Figure 1 The double-layer high-pressure-resistant and low-stiffness flexible compensation device shown includes a left large flange 1, a right large flange 13, and a double-layer rubber tube body arranged between the left large flange 1 and the right large flange 13. Both the left large flange 1 and the right large flange 13 have multiple mounting holes for installing equipment connected to the double-layer high-pressure-resistant and low-stiffness flexible compensation device.

[0026] The double-layer rubber tube body includes an outer rubber tube body 12 and an inner rubber tube body 24. Both the outer rubber tube body 12 and the inner rubber tube body 24 include n upper U-shaped (or Ω-shaped) bladders 8 and (n-1) lower U-shaped (or Ω-shaped) bladders 9. The upper U-shaped bladders 8 and lower U-shaped bladders 9 are arranged alternately, and the U-shaped cavities of the upper U-shaped bladders 8 and the lower U-shaped bladders 9 are arranged opposite each other. A large compression ring 7 is clamped on the outer edge of the upper U-shaped bladder 8, and a small compression ring 6 is clamped inside the U-shaped cavity of the lower U-shaped bladder 9. The large compression ring 7 is vulcanized integrally with the upper U-shaped bladder 8, and the small compression ring 6 is vulcanized integrally with the lower U-shaped bladder 9. The upper U-shaped bladder 8 includes an upper horizontal section 11 and upper... Similarly, the lower U-shaped bladder 9 includes a lower horizontal section 20 and lower circular arc sections 14 at both ends of the lower horizontal section 20. The upper circular arc section 23 of the upper U-shaped bladder 8 is connected to the lower circular arc section 14 of the lower U-shaped bladder 9. The left end connection sections 16 of the outer tube rubber tube 12 and the inner tube rubber tube 24 are both connected and fixed to the left large flange 1 via a three-flange 10 and a first double-ended stud 15. The right end connection section 16 of the outer tube rubber tube 12 is connected and fixed to the right large flange 13 via a three-flange and a second double-ended stud 17. The right end connection section 16 of the inner tube rubber tube 24 is locked to the three-flange 10 via a first bolt 18, and the three-flange 10 is connected and fixed to the right large flange 13 via a second bolt 19. Furthermore, the upper U-shaped bladders 8 at both ends of the outer tube rubber tube 12 and the inner tube rubber tube 24 are connected to the end connection sections 16 via lower circular arc sections 14.

[0027] See Figure 4 The central angle α of the upper arc segment 23 is 90° to 180°, and the central angle γ of the lower arc segment 14 satisfies γ = 90° + arcsin(r1sin(α-90°) / r2), where r1 is the outer radius of the upper arc segment and r2 is the outer radius of the lower arc segment. The length L of the upper horizontal segment 11 of the upper U-shaped capsule 8 satisfies S = nL, where S is the displacement compensation capacity of the double-layer high-pressure-resistant, low-stiffness flexible compensation device.

[0028] The three flanges 10 in this invention are the connecting flanges disclosed in Chinese Invention Patent (Patent No. 2004100126877), including an outer flange 2, a middle flange 3, an inner flange 5, and a bushing 4. Specific structures and connections are not detailed here. Furthermore, both the outer rubber tube body 12 and the inner rubber tube body 24 are composed of an inner rubber layer 25, a skeleton layer 26, and an outer rubber layer 27. The skeleton layer 26 is formed by winding fabric, and the fabric is clamped and fixed by the inner and outer flanges after winding around the middle flange. The inner rubber layers of the end connection sections 16 at both ends of the outer rubber tube body 12 and the inner rubber tube body 24 are vulcanized integrally with the outer flange, and the inner rubber layers of the end connection sections 16 at both ends of the outer rubber tube body 12 and the inner rubber tube body 24 are vulcanized integrally with the inner flange.

[0029] See Figure 4 Both the intermediate flange 3 and the inner flange 5 are L-shaped. The transverse end face of the inner flange 5 is a bevel 28, and the angle β formed by the bevel 28 and the outer circular surface of the upper arc segment 23 being tangent to each other satisfies β+γ=180° with the central angle γ of the lower arc segment. At the same time, the two ends of the small clamping ring 6 abut against the arc cavity of the lower arc segment 14 at both ends of the lower U-shaped bladder 9.

[0030] See Figure 2 On the left large flange 1 and the right large flange 13, which are in contact with the three flanges 10, there are double-layer annular grooves, namely an outer annular groove 21 and an inner annular groove 22. An annular O-ring is provided in the outer annular groove 21, and a PTC plug seal is provided in the inner annular groove 22, so as to achieve a double-stage seal of the double-layer flexible pipe.

[0031] Depending on the workload, see Figure 3 The skeleton layer can be composed of multiple layers of interlaced fabric and rubber layers. The number of fabric layers and the winding angle of the fabric are not particularly limited. Those skilled in the art can design it according to their needs. The material of the fabric can be high-strength aramid fiber or other fiber materials such as nylon and polyester.

[0032] The main design parameters of the double-layer high-pressure-resistant, low-stiffness flexible compensation device of this invention are shown in Table 1, and the main performance test results are shown in Table 2. The test results show that the double-layer high-pressure-resistant, low-stiffness flexible compensation device has the characteristics of high pressure resistance, high reliability, large displacement compensation, and strong vibration reduction performance, which can meet the actual use requirements of ships.

[0033] Table 1. Structural parameters of an invention example of a double-layer high-pressure-resistant, low-stiffness flexible compensation device.

[0034] Serial Number Structural parameters Design value 1 Nominal diameter DN650 2 Nominal pressure 4.5MPa 3 Axial length 850mm 4 Maximum outer diameter 1470mm 5 skeleton layer material Aramid fiber

[0035] Table 2. Test Results of Invention Examples of Double-Layer High-Pressure-Resistant, Low-Stiffness Flexible Compensation Devices

[0036] Serial Number Experimental Project Test results 1 Compressive strength test The pressure was 6.8 MPa, and there were no leaks or other abnormalities in the pipe. 2 Axial displacement compensation test Axial compression 19.5mm, tensile 16.5mm 3 Radial displacement compensation test Radial shear 10.5mm 4 Axial stiffness test 3.5 kN / mm (4.5 MPa) 5 Radial stiffness test 1.5 kN / mm (4.5 MPa)

Claims

1. A double-layer high-pressure-resistant, low-stiffness flexible compensation device, characterized in that: It includes a left large flange (1), a right large flange (13), and a double-layer rubber tube body arranged between the left large flange (1) and the right large flange (13); the double-layer rubber tube body includes an outer tube rubber tube body (12) and an inner tube rubber tube body (24), both the outer tube rubber tube body (12) and the inner tube rubber tube body (24) include n upper U-shaped bladders (8) and (n-1) lower U-shaped bladders (9), the upper U-shaped bladders (8) and the lower U-shaped bladders (9) The upper U-shaped bladder (8) and the lower U-shaped bladder (9) are arranged in an alternating manner; the left end connection section (16) of the outer tube rubber tube (12) and the inner tube rubber tube (24) are both connected and fixed to the left large flange (1) through a three-flange (10); the right end connection section (16) of the outer tube rubber tube (12) and the inner tube rubber tube (24) are both connected and fixed to the right large flange (13) through a three-flange. The upper U-shaped bladder (8) includes an upper horizontal section (11) and upper arc sections (23) at both ends of the upper horizontal section (11). The lower U-shaped bladder (9) includes a lower horizontal section (20) and lower arc sections (14) at both ends of the lower horizontal section (20). The upper arc section (23) of the upper U-shaped bladder (8) and the lower arc section (14) of the lower U-shaped bladder (9) are connected to each other. The upper U-shaped bladders (8) at both ends of the outer tube rubber tube (12) and the inner tube rubber tube (24) are connected to the end connecting section (16) through the lower arc section (14). The outer edge of the upper U-shaped bladder (8) is fitted with a large compression ring (7), and the U-shaped cavity of the lower U-shaped bladder (9) is fitted with a small compression ring (6); the large compression ring (7) is vulcanized with the upper U-shaped bladder (8), and the small compression ring (6) is vulcanized with the lower U-shaped bladder (9). The three flanges (10) include an outer flange (2), a middle flange (3), an inner flange (5), and a bushing (4). The outer rubber tube body (12) and the inner rubber tube body (24) are both composed of an inner rubber layer (25), a skeleton layer (26), and an outer rubber layer (27). The inner rubber layer (25) of the end connection section (16) of the outer rubber tube body (12) and the inner rubber tube body (24) are vulcanized with the outer flange (2). The inner rubber layer of the end connection section (16) of the outer rubber tube body (12) and the inner rubber tube body (24) is vulcanized with the inner flange.

2. The double-layer high-pressure-resistant, low-stiffness flexible compensation device according to claim 1, characterized in that: The central angle of the upper arc segment (23) α The central angle of the lower arc segment (14) is 90°~180°. γ satisfy Where r1 is the outer radius of the upper arc segment and r2 is the outer radius of the lower arc segment; the length L of the upper horizontal segment (11) of the upper U-shaped capsule (8) satisfies S represents the displacement compensation capability of the double-layer high-pressure-resistant, low-stiffness flexible compensation device.

3. The double-layer high-pressure-resistant, low-stiffness flexible compensation device according to claim 1, characterized in that: All inner flanges (5) are L-shaped, and the transverse end face of the inner flange (5) is a bevel (28), and the angle formed by the bevel (28) and the outer circular surface of the upper arc segment (23) is tangent to each other. β The central angle γ between the lower arc segment and the arc segment satisfies .

4. The double-layer high-pressure-resistant, low-stiffness flexible compensation device according to claim 1, characterized in that: The two ends of the small compression ring (6) abut against the arc cavity of the lower arc segment (14) at both ends of the lower U-shaped bladder (9).

5. The double-layer high-pressure-resistant, low-stiffness flexible compensation device according to claim 1, characterized in that: The left large flange (1) and the right large flange (13) are respectively provided with double-layer annular grooves on the surfaces that are in contact with the three flanges (10), namely an outer annular groove (21) and an inner annular groove (22). An annular O-ring is provided in the outer annular groove (21), and a PTC plug seal is provided in the inner annular groove (22).

6. The double-layer high-pressure-resistant, low-stiffness flexible compensation device according to claim 1, characterized in that: Both the outer tube rubber tube (12) and the inner tube rubber tube (24) include n upper Ω-shaped bladders and (n-1) lower Ω-shaped bladders. The upper Ω-shaped bladders and lower Ω-shaped bladders are arranged alternately, and the Ω-shaped cavities of the upper Ω-shaped bladders and the Ω-shaped cavities of the lower Ω-shaped bladders are arranged opposite each other.

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