A multi-dimensional pipe dynamic vibration absorber using a flexible hinge

Abstract

The present application belongs to the field of mechanical vibration and vibration reduction and noise reduction technology, and particularly relates to a pipeline multi-dimensional dynamic vibration absorber adopting a flexible hinge. The present application comprises three groups of identical pipe clamps, flexible bases, flexible double connecting rods, fixed mass blocks and adjustable mass blocks, and is in a spatial three-symmetrical distribution; the three pipe clamps are connected into a complete circular pipe clamp and are fixed on a pipeline system; the flexible bases are fixedly installed on the pipe clamps; the fixed mass blocks are connected with the flexible bases through the flexible double connecting rods; and the adjustable mass blocks are respectively and detachably connected with the two adjacent fixed mass blocks. The present application has the advantages of compact mechanical structure, small volume, convenient installation and adjustable frequency, and can solve the problem of multi-dimensional line spectrum vibration control of the pipeline system.

Description

Technical Field

[0001] This invention belongs to the field of mechanical vibration and vibration reduction technology, specifically relating to a multi-dimensional dynamic vibration absorber for pipelines using flexible hinges. Background Technology

[0002] Piping systems, as a crucial component of power plants, connect power machinery and transmit media, characterized by complex spatial layouts and diverse media pressures and load conditions. With the widespread application of technologies such as double-layer vibration isolation and floating raft vibration isolation, vibration noise transmitted from power machinery through the base has been significantly reduced, making pipeline vibration noise a more prominent issue. Pipeline vibration easily causes structural wear and fatigue, and in severe cases, can even lead to pipeline rupture or system failure, resulting in disasters. Therefore, pipeline vibration control has become a critical factor affecting the safety and reliability of power plants. Currently, vibration control of pipeline systems mainly focuses on the vibration transmission path, such as connecting flexible conduits between the vibration source equipment and the pipeline, or installing vibration isolators or elastic supports between the pipeline and the base. These measures can effectively attenuate or isolate the vibration energy of the pipeline system, achieving good broadband vibration reduction in the mid-to-high frequency range, but their effect on reducing the vibration of the pipeline's low-frequency characteristic spectrum is not significant.

[0003] Dynamic vibration absorbers are devices that suppress the vibration of the main system through their own vibration. They have advantages such as low environmental dependence, simple installation, and the ability to specifically manage line spectrum vibrations, providing an important technical option for solving the problem of low-frequency line spectrum vibrations in pipeline systems. Considering the complex spatial structure of the pipeline system in the dynamic unit, and the mutual conversion of multiple vibration components transmitted along the pipeline, dynamic vibration absorbers need to be installed in three perpendicular directions to effectively control the line spectrum vibration of the pipeline; otherwise, it is difficult to achieve satisfactory vibration reduction effects. Therefore, three-dimensional dynamic vibration absorbers are often used in pipelines. However, existing multi-dimensional dynamic vibration absorbers are essentially composed of multiple unidirectional dynamic vibration absorbers. Although they have advantages such as simple design and convenient installation, they have disadvantages such as large spatial dimensions and large mass of introduced accessories. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a multidimensional dynamic vibration absorber for pipelines using a flexible hinge, which can solve the problem of multidimensional line spectrum vibration control in pipeline systems.

[0005] The technical solution adopted in this invention is as follows: A multi-dimensional dynamic vibration absorber for pipelines using flexible hinges includes three identical sets of pipe clamps, a flexible base, a flexible double connecting rod, a fixed mass block, and an adjustable mass block, arranged in a spatially tri-symmetrical distribution. The three pipe clamps are connected to form a complete circular pipe clamp, which is fixed to the pipeline system. The flexible base is fixedly installed on the pipe clamps. The fixed mass block is connected to the flexible base through the flexible double connecting rod. The adjustable mass block is detachably connected to two adjacent fixed mass blocks.

[0006] A boss is provided at the center of the outer wall of the pipe clamp, and a flexible base is fixedly installed on the boss.

[0007] The flexible base adopts a rectangular frame structure, including a fixed plate, a translational plate, and two identical connecting plates. The two ends of the two connecting plates are respectively connected to the fixed plate and the translational plate through flexible rotating hinges to form an integral frame structure.

[0008] The upper end of the translational plate is provided with an installation platform, and the lower end of the flexible double connecting rod is fixedly installed on the installation platform.

[0009] The flexible double link adopts a parallel four-bar structure, including an upper fixed link, two identical connecting rods, a lower fixed link, and a flexible ball joint. The two ends of the two connecting rods are respectively connected to the upper fixed link and the lower fixed link through the flexible ball joint, forming an integral structure.

[0010] The adjustable mass block is fixedly connected to two adjacent fixed mass blocks by a fourth bolt, serving as a connecting component for the fixed mass blocks; the three sets of fixed mass blocks and adjustable mass blocks are combined to form the vibration-absorbing mass block of the multidimensional dynamic vibration absorber.

[0011] The flexible base has a flexible rotational hinge with one degree of freedom to rotate about a rotation axis; the rotation axes of the four flexible rotational hinges on the flexible base are parallel to each other, and the two connecting plates are parallel to each other, ensuring that the translational plate has a translational degree of freedom relative to the fixed plate.

[0012] The flexible rotary hinge is a straight beam type flexible rotary hinge, a straight circle type flexible rotary hinge, an elliptical type flexible rotary hinge, or a parabolic type flexible rotary hinge.

[0013] The flexible ball joint of the flexible double link has three rotational degrees of freedom, and the two links in the flexible double link are parallel to each other.

[0014] The flexible ball joint is a parabolic flexible ball joint, an elliptical flexible rotational joint, a hyperbolic flexible ball joint, or a cylindrical flexible ball joint.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention provides a novel multidimensional dynamic vibration absorber with flexible hinges. Its first three modes are translational modes along three vertical directions. By reasonably designing the structural parameters of the vibration absorber, the line spectrum vibration of the pipeline along three vertical directions at the target frequency can be suppressed at the same time.

[0016] (2) The present invention provides a novel multidimensional dynamic vibration absorber using flexible hinges, which employs a flexible mechanism with a multi-closed-loop kinematic chain structure. The elastic link is realized by flexible hinges, eliminating gaps, friction, and wear problems. The various components are connected by standard bolts and nuts, facilitating installation.

[0017] (3) The present invention provides a novel multidimensional dynamic vibration absorber with flexible hinge, which has the advantages of compact mechanical structure, small size and adjustable frequency.

[0018] (4) The present invention provides a novel multidimensional dynamic vibration absorber with flexible hinge, which can be applied to the line spectrum vibration control of pipeline systems in nuclear power plants and has broad application prospects. Attached Figure Description

[0019] Figure 1 This invention provides a schematic diagram of the overall structure of a novel multidimensional dynamic vibration absorber employing a flexible hinge. Figure 1 ; Figure 2 This invention provides a schematic diagram of the overall structure of a novel multidimensional dynamic vibration absorber employing a flexible hinge. Figure 2 ; Figure 3 This is a schematic diagram of the pipe clamp and flexible base structure of the present invention; Figure 4 This is a schematic diagram of the flexible double connecting rod, fixed mass block and adjustable mass block of the present invention; Figure 5 This is a schematic diagram of the invention installed on a pipeline system; In the diagram: 1: pipe clamp, 2: flexible base, 3: flexible double connecting rod, 4: fixed mass block, 5: adjustable mass block, 6: first bolt, 7: first nut, 8: second bolt, 9: third bolt, 10: fourth bolt, 21: fixed plate, 22: translation plate, 23: connecting plate, 24: flexible rotating hinge, 31: upper fixed rod, 32: connecting rod, 33: lower fixed rod, 34: flexible ball joint. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] like Figure 1 and Figure 2 As shown, the present invention provides a multi-dimensional dynamic vibration absorber for pipelines using flexible hinges, comprising three identical sets of pipe clamps 1, flexible bases 2, flexible double connecting rods 3, fixed mass blocks 4, and adjustable mass blocks 5, arranged in a spatially tri-symmetrical distribution; the three pipe clamps 1 are connected into a complete circular pipe clamp by first bolts 6 and first nuts 7, and fixed to the pipeline system; a boss is provided at the center of the outer wall of the pipe clamp 1, and the flexible base 2 is fixedly installed on the boss; like Figure 3 As shown, the flexible base 2 adopts a rectangular frame structure, including a fixed plate 21, a translational plate 22, and two identical connecting plates 23. The two ends of the two connecting plates 23 are respectively connected to the fixed plate 21 and the translational plate 22 through flexible rotating hinges 24 to form an integral frame structure. The fixed plate 21 is fixed to the boss by a second bolt 8. The upper end of the translational plate 22 is provided with an installation platform. The lower end of the flexible double connecting rod 3 is fixedly installed on the installation platform, and the upper end of the flexible double connecting rod 3 is installed on the lower part of the fixed mass block 4. An adjustable mass block 5 is installed on the upper surface of the fixed mass block 4. like Figure 4As shown, the flexible double connecting rod 3 adopts a parallel four-bar structure, including an upper fixed rod 31, two identical connecting rods 32, a lower fixed rod 33, and a flexible ball joint 34. The two ends of the two connecting rods 32 are respectively connected to the upper fixed rod 31 and the lower fixed rod 33 through the flexible ball joint 34 to form an integral structure. The upper fixed rod 31 is fixedly connected to the lower part of the fixed mass block 4 through a third bolt 9, and the lower fixed rod 33 is fixedly connected to the installation platform through a third bolt 9. The adjustable mass block 5 is fixedly connected to two adjacent fixed mass blocks 4 by the fourth bolt 10, serving as a connecting member for connecting the fixed mass blocks 4; the three sets of fixed mass blocks 4 and adjustable mass blocks 5 are combined to form the vibration absorption mass block of the multidimensional dynamic vibration absorber. The flexible rotating hinge 24 of the flexible base 2 has one degree of freedom to rotate about the rotation axis; the rotation axes of the four flexible rotating hinges 24 on the flexible base 2 are parallel to each other, and the two connecting plates 23 are parallel to each other, ensuring that the translational plate 22 has one degree of translational freedom relative to the fixed plate 21; the flexible rotating hinge 24 can be a straight beam type flexible rotating hinge, a straight circle type flexible rotating hinge, an elliptical type flexible rotating hinge, or a parabolic type flexible rotating hinge.

[0024] The flexible ball joint 34 of the flexible double link 3 has three rotational degrees of freedom, and the two links 32 in the flexible double link 3 are parallel to each other. The flexible ball joint 34 is a parabolic flexible ball joint, an elliptical flexible rotational joint, a hyperbolic flexible ball joint, or a cylindrical flexible ball joint to ensure the range of motion of the flexible ball joint.

[0025] The adjustable mass block 5 can be easily disassembled and replaced to achieve frequency adjustment of the multi-dimensional dynamic vibration absorber and meet the line spectrum vibration control requirements of different pipeline systems.

[0026] like Figure 5 The diagram shows a schematic of the multidimensional dynamic vibration absorber of the present invention installed in a pipeline device. Simulation analysis results show that when the modal natural frequencies of the dynamic vibration absorber along the three vertical directions are 85.9Hz, 86.0Hz, and 86.0Hz, respectively, the location of the multidimensional dynamic vibration absorber installed in the pipeline is within the target frequency range of 84Hz to 88Hz, and the vibration reduction effect along the X, Y, and Z coordinate axes is above 25dB, 8dB, and 20dB, respectively.

[0027] Because the multidimensional dynamic vibration absorber of the pipeline adopts a flexible mechanism with a multi-closed-loop kinematic chain structure, and the elastic link is realized by a flexible hinge, there are no gaps, friction and wear problems. It has the advantages of compact mechanical structure, small size, easy installation and frequency adjustment.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-dimensional pipe dynamic vibration absorber employing a flexible hinge, characterized by, It includes three identical pipe clamps (1), a flexible base (2), a flexible double connecting rod (3), a fixed mass block (4), and an adjustable mass block (5), arranged in a spatially tri-symmetrical distribution; the three pipe clamps (1) are connected to form a complete circular pipe clamp, which is fixed on the pipeline system; the flexible base (2) is fixedly installed on the pipe clamp (1), the fixed mass block (4) is connected to the flexible base (2) through the flexible double connecting rod (3), and the adjustable mass block (5) is detachably connected to two adjacent fixed mass blocks (4); The flexible base (2) adopts a rectangular frame structure, including a fixed plate (21), a translational plate (22), and two identical connecting plates (23). The two ends of the two connecting plates (23) are connected to the fixed plate (21) and the translational plate (22) respectively through flexible rotating hinges (24) to form an integral frame structure.

2. The multi-dimensional dynamic vibration absorber for pipelines employing flexible hinges according to claim 1, characterized in that, The outer wall of the pipe clamp (1) is provided with a boss at the center, and the flexible base (2) is fixedly installed on the boss.

3. The multi-dimensional dynamic vibration absorber for pipelines employing flexible hinges according to claim 2, characterized in that, The upper end of the translation plate (22) is provided with an installation platform, and the lower end of the flexible double connecting rod (3) is fixedly installed on the installation platform.

4. The multi-dimensional dynamic vibration absorber for pipelines employing flexible hinges according to claim 3, characterized in that, The flexible double link (3) adopts a parallel four-bar structure, including an upper fixed link (31), two identical links (32), a lower fixed link (33), and a flexible ball joint (34). The two ends of the two links (32) are respectively connected to the upper fixed link (31) and the lower fixed link (33) through the flexible ball joint (34) to form an integral structure.

5. The multi-dimensional dynamic vibration absorber for pipelines employing flexible hinges according to claim 1, characterized in that, The adjustable mass block (5) is fixedly connected to two adjacent fixed mass blocks (4) by the fourth bolt (10) and serves as a connector for connecting the fixed mass blocks (4); the three sets of fixed mass blocks (4) and adjustable mass blocks (5) are combined to form the vibration-absorbing mass block of the multidimensional dynamic vibration absorber.

6. The multi-dimensional dynamic vibration absorber for pipelines employing flexible hinges according to claim 4, characterized in that, The flexible base (2) has a flexible rotation hinge (24) with one degree of freedom to rotate about the rotation axis; the rotation axes of the four flexible rotation hinges (24) on the flexible base (2) are parallel to each other, and the two connecting plates (23) are parallel to each other, ensuring that the translation plate (22) has a translational degree of freedom relative to the fixed plate (21).

7. The multi-dimensional dynamic vibration absorber for pipelines employing flexible hinges according to claim 6, characterized in that, The flexible rotating hinge (24) is a straight beam type flexible rotating hinge, a straight circle type flexible rotating hinge, an elliptical type flexible rotating hinge, or a parabolic type flexible rotating hinge.

8. The multi-dimensional dynamic vibration absorber for pipelines employing flexible hinges according to claim 4, characterized in that, The flexible ball joint (34) of the flexible double link (3) has three rotational degrees of freedom, and the two links (32) in the flexible double link (3) are parallel to each other.

9. The multi-dimensional dynamic vibration absorber for pipelines employing flexible hinges according to claim 8, characterized in that, The flexible ball joint (34) is a parabolic flexible ball joint, an elliptical flexible rotational joint, a hyperbolic flexible ball joint, or a cylindrical flexible ball joint.

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