Submarine pipeline damping device

Abstract

The submarine pipeline damping device comprises a pipeline, a base, an inclined coil spring and a pipe clamp, the inclined coil spring is wound on the outer circumference of the pipeline, the pipe clamp is laid on the outer side of the inclined coil spring, and the inclined coil spring is wrapped by the pipe clamp and the base together. The inclined coil spring structure in the submarine pipeline damping device provided by the invention is a main component for realizing low inherent frequency in the whole system, and plays a key role in system damping. Compared with a traditional rubber shock absorber and a traditional metal shock absorber, the performance in all aspects is greatly improved, the inherent frequency of a system can be effectively regulated and controlled by adjusting the wire diameter, the number of turns and the cross section size of the spring through the design, large-amplitude resonance under external excitation is avoided, and the stability of the system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of submarines, and in particular relates to a submarine pipeline vibration reduction device. Background Art

[0002] Due to the harsh working environment and complex systems of submarines, especially the high-temperature piping system of submarines, it still faces multiple challenges during operation, which are mainly reflected in the following aspects:

[0003] Special working environment: The working temperature and pressure of the submarine high temperature piping system are high, which involves strict requirements on safety and other aspects. Therefore, the requirements for vibration reduction measures are very high.

[0004] Vibration energy problem: Due to the large number of cut-off components in the submarine's high-temperature piping system and the fast flow rate of the medium, the vibration energy is prominent, which has become a bottleneck problem that needs to be overcome in the development of quiet submarines.

[0005] Vibration reduction methods are limited: efficient vibration reduction methods are limited, and there is an urgent need for a high-temperature pipeline vibration reduction solution with low-frequency, broadband vibration isolation and impact resistance.

[0006] Internationally, research on vibration reduction solutions for equipment such as submarine high-temperature pipelines is relatively active, mainly focusing on vibration reduction materials and structural design. The operating temperature of traditional rubber shock absorbers is -20 to 80°C. Excessive temperature will affect the service life, natural frequency and other parameter performance of rubber shock absorbers. Metal shock absorbers are all in a single direction, with poor stability in complex environments, and the equipment is heavy and has poor heat dissipation. Some international research focuses on the study of vibration transmission and energy dissipation mechanisms, striving to improve the vibration reduction effect and impact resistance analysis accuracy. Some studies have tried to use high-temperature tolerant spring materials, but there are great challenges in low-frequency broadband vibration isolation and impact resistance, and a systematic theoretical and technical system has not yet been formed. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a submarine pipeline vibration reduction device to solve the challenging problem of submarine high-temperature pipeline vibration reduction in response to the deficiencies in the prior art. The adopted canted coil spring process already has a mature production system, and has been greatly improved in multiple parameter performances compared to traditional rubber shock absorbers and metal shock absorbers.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A submarine pipeline vibration reduction device comprises a pipeline, a base, a bevel coil spring and a pipe clamp. The bevel coil spring is wound on the outer circumference of the pipeline, and the pipe clamp is laid on the outside of the bevel coil spring and wraps the bevel coil spring together with the base.

[0010] In order to better realize the present invention, further optimization is made in the above structure, the pipe clamp is a semi-enclosed structure, both ends of the pipe clamp are connected to the base, and supporting feet are provided at the connection between the pipe clamp and the base.

[0011] In order to better implement the present invention, further optimization is made in the above structure, and damping and vibration reduction pads are arranged at the supporting feet.

[0012] In order to better realize the present invention, further optimization is made in the above structure, and the damping vibration reduction pad is formed by winding and stamping of metal wire.

[0013] In order to better implement the present invention, further optimization is made in the above structure, and the helical coil spring is a ring structure connected end to end.

[0014] In order to better implement the present invention, further optimization is made in the above structure, and two canted coil springs are provided.

[0015] In order to better realize the present invention, further optimization is made in the above structure, and the canted coil spring and the damping vibration reduction pad are both made of 0Cr18Ni9 stainless steel.

[0016] In order to better realize the present invention, further optimization is made in the above structure, the number of turns of the canted coil spring is 70 turns, the positive compression stiffness of the canted coil spring Ki=2.28N / mm, and the outer diameter of the pipeline R=75mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The canted coil spring structure in the submarine pipeline vibration reduction device provided by the present invention is the main component for achieving low natural frequency in the entire system and plays a key role in system vibration reduction. This design can effectively control the natural frequency of the system by adjusting the spring wire diameter, number of coils and cross-sectional dimensions, avoid large-amplitude resonance under external excitation, and improve the stability of the system.

[0019] 2. The present invention is also provided with a damping vibration-isolating pad. The canted coil spring is combined with the damping vibration-isolating pad. The introduction of the damping vibration-isolating pad is intended to provide additional damping to absorb and dissipate vibration energy. The combination of the two can achieve rapid attenuation of the excitation response while maintaining a lower natural frequency, thereby making the vibration response of the system more stable. Not only the vibration reduction effect is taken into consideration, but also the high durability of the product under high temperature and long-term dynamic load conditions is fully considered in the design. By selecting high temperature resistant materials, optimizing the structural stress mode, and simplifying the assembly process, it is ensured that the vibration reduction system can still maintain stable performance under extreme working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the submarine pipeline vibration reduction device of the present invention;

[0022] Figure 2 is a front view of the submarine pipeline vibration reduction device of the present invention;

[0023] Figure 3 This is the front view of the canted coil spring in the submarine pipeline vibration reduction device.

[0024] In the figure:

[0025] 1-Pipeline, 2-Base, 3-Canted coil spring, 4-Pipe clamp, 5-Damping pad. DETAILED DESCRIPTION

[0026] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The present invention aims at the high-temperature vibration reduction demand of submarine pipeline vibration reduction. The key technology that needs to be broken through in this scheme is to use high-temperature resistant materials to achieve the vibration reduction technical requirements, propose a high-temperature resistant pipeline vibration reduction technical scheme, develop and produce vibration reduction structure samples, and iteratively optimize the product structure through static and dynamic performance tests, so that the product has high-temperature vibration reduction and buffering performance that meet the technical requirements, and pass the system test assessment, mainly low-frequency and full-frequency vibration tests, to meet the GJB150.18-1964 test assessment requirements.

[0030] Reference Figure 1-Figure 3 The schematic diagram of the structure of the submarine pipeline vibration reduction device provided by the present invention includes a pipeline 1, a base 2, a bevel coil spring 3 and a pipe clamp 4. The bevel coil spring 3 is wound on the outer circumference of the pipeline 1. The bevel coil spring 3 is a ring structure connected end to end. Two bevel coil springs 3 are arranged in a single vibration reduction system. The bevel coil spring structure is the main component for achieving low natural frequency in the whole system and plays a key role in system vibration reduction. This design can effectively control the natural frequency of the system by adjusting the spring wire diameter, the number of turns and the cross-sectional size, so as to meet the technical requirement that the natural frequency of the system is not more than 10Hz, avoid large-amplitude resonance under external excitation, and improve the stability of the system. The pipe clamp 4 is laid on the outside of the bevel coil spring 3 and wraps the bevel coil spring 3 together with the base 2, so that the actual installation method of the bevel coil spring 3 is convenient and reliable.

[0031] The pipe clamp 4 is a semi-enclosed structure, and both ends of the pipe clamp 4 are connected to the base 2. A support foot is provided at the connection between the pipe clamp 4 and the base 2. A damping vibration damping pad 5 is provided at the support foot. The introduction of the damping vibration damping pad 5 is intended to provide additional damping. The canted coil spring 3 is combined with the damping vibration damping pad 5 to absorb and dissipate vibration energy. The combination of the two can achieve rapid attenuation of the excitation response while maintaining a low natural frequency, making the vibration response of the system more stable. At the same time, the design of the canted coil spring 3 and the damping vibration damping pad 5 overcomes the problem that the traditional metal wire mesh type shock absorber has poor performance under low-frequency and large-amplitude loads. The damping vibration damping pad 5 is a capillary porous tissue material formed by metal wire winding and stamping. Because its properties are similar to rubber, it is also called metal rubber. The stiffness and damping of the vibration damping pad made of metal wire can be controlled by the metal wire diameter, porosity, etc., and its natural frequency is generally in the range of 10-25Hz. In the actual development process, the forming process of the metal wire mesh needs to be considered to ensure its designed porosity and avoid plastic deformation during vibration and impact.

[0032] The helical coil spring 3 and the damping pad 5 are both made of 0Cr18Ni9 stainless steel. As the currently preferred material, 0Cr18Ni9 stainless steel forms a chromium oxide layer on its surface under high temperature conditions, which can improve the oxidation resistance of stainless steel and play a protective role. In addition, 0Cr18Ni9 stainless steel can maintain good creep resistance at 300 degrees Celsius. At the same time, the expansion ratio of the stainless steel wire is less than 5‰, which can better maintain stable vibration reduction performance.

[0033] See Figure 3 The number of turns of the bevel coil spring 3 is 70. The forward compression stiffness Ki of the bevel coil spring 3 measured by physical simulation software is 2.28N / mm. The outer diameter R of the pipeline 1 is 75mm. Since the bevel coil spring 3 is wound in the pipeline 1, the inner diameter of the bevel coil spring 3 is the same as the outer diameter of the pipeline 1. The inner radius of the bevel coil spring 3 is 75mm, and the outer radius of the bevel coil spring 3 is 109mm. Based on this, the technical indicator of the system frequency being less than 10Hz can be estimated.

[0034] First, when analyzing the overall stiffness of the spring, it is assumed that the pipe clamp is fixed and the outer wall of the pipe moves horizontally. A polar coordinate system is established with the center of the pipe as the pole, and then the polar coordinate equation of the outer wall contour of the pipe is obtained:

[0035] ρ 2 -2Aρcosθ+(A 2 -R 2 )=0;

[0036] Where: A——pipeline horizontal displacement;

[0037] R——Radius of the outer wall of the pipe.

[0038] Then we can solve:

[0039]

[0040]

[0041]

[0042] The radial stiffness expression of the 1 / 4 turn helical coil spring is:

[0043]

[0044] Let A=-1 to get K 1 / 4 =18.8N / mm, then K = 4K 1 / 4 =75.2N / mm.

[0045] Assuming the weight of the pipeline unit is 300kg, ignoring the damping of the metal wire damping pad 5, according to the single degree of freedom free vibration frequency calculation formula It can be estimated that the system frequency f=2.5Hz, which meets the technical indicator of no more than 10Hz.

[0046] In terms of the vibration isolation effect of the vibration reduction system, the finite element analysis software is used to perform random vibration analysis, and the RMS value of the pipeline response PSD spectrum is extracted to evaluate the vibration isolation effect. In order to simplify the analysis model, the canted coil spring 3 is equivalent to an 8-branch spring, and the wire damping vibration pad 5 can be simplified to a rubber material without considering high temperature. Random vibration simulation is carried out based on the radial natural frequency of 2.5Hz. The vibration spectrum magnitude refers to the vibration test value of 0.001G^2 / Hz for equipment installed on ships given in Figure C.15 of Appendix C of GJB 150.16A-2009. The simulation results show that the RMS values ​​of 5-15Hz and 5-10000Hz responses are 0.0148G and 0.118G respectively. It can be calculated that the low-frequency vibration isolation effect is 16.6dB, and the high-frequency vibration isolation effect is 28.6dB, which meets the technical indicators of vibration isolation effect.

[0047] This application not only considers the vibration reduction effect, but also fully considers the high durability of the product under high temperature and long-term dynamic load conditions in the design. By selecting high-temperature resistant materials, optimizing the structural force mode, and simplifying the assembly process, it ensures that the vibration reduction system can still maintain stable performance under extreme working conditions. Through these innovations, an effective and durable technical solution is provided for the vibration reduction of submarine high-temperature pipelines, improving the performance and safety level of submarines.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A submarine pipeline vibration reduction device, characterized in that: The invention comprises a pipeline (1), a base (2), a bevel coil spring (3) and a pipe clamp (4), wherein the bevel coil spring (3) is wound around the outer circumference of the pipeline (1), and the pipe clamp (4) is laid on the outside of the bevel coil spring (3) and wraps the bevel coil spring (3) together with the base (2).

2. A submarine pipeline vibration reduction device according to claim 1, characterized in that: The pipe clamp (4) is a semi-enclosed structure, with both ends of the pipe clamp (4) connected to the base (2), and a support foot is provided at the connection between the pipe clamp (4) and the base (2).

3. A submarine pipeline vibration reduction device according to claim 2, characterized in that: The support feet are provided with damping and vibration reduction pads (5).

4. A submarine pipeline vibration reduction device according to claim 3, characterized in that: The damping vibration reduction pad (5) is formed by coiling and stamping a metal wire.

5. A submarine pipeline vibration reduction device according to any one of claims 1 to 4, characterized in that: The helical coil spring (3) is a ring-shaped structure connected end to end.

6. A submarine pipeline vibration reduction device according to claim 5, characterized in that: Two canted coil springs (3) are provided.

7. A submarine pipeline vibration reduction device according to claim 4, characterized in that: The canted coil spring (3) and the damping vibration reduction pad (5) are both made of 0Cr18Ni9 stainless steel.

8. A submarine pipeline vibration reduction device according to claim 5, characterized in that: The number of turns of the canted coil spring (3) is 70, the forward compression stiffness Ki of the canted coil spring (3) is 2.28 N / mm, and the outer diameter R of the pipeline (1) is 75 mm.

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