A low-frequency vibration isolation self-balancing chiral metamaterial pipeline

Abstract

The application relates to a self-balanced chiral metamaterial pipeline for low-frequency vibration isolation, and aims to solve the problems of large pipeline vibration and noise in actual products. The self-balanced chiral metamaterial pipeline for low-frequency vibration isolation comprises a pipeline connecting structure, a group of chiral metamaterial structure skeletons and a rubber sleeve with elasticity; the pipeline connecting structure is arranged in an axial direction; the group of chiral metamaterial structure skeletons are installed on the pipeline connecting structure in the axial direction; and the rubber sleeve with elasticity is wrapped on the group of chiral metamaterial structure skeletons and installed on the pipeline connecting structure. The application is applied to the field of ships.

Description

Technical Field

[0001] This invention relates to a novel self-balancing chiral metamaterial pipeline for low-frequency vibration isolation, specifically a self-balancing chiral metamaterial pipeline for low-frequency vibration isolation, and this invention is applied in the field of shipbuilding. Background Technology

[0002] With the development of science and technology and the improvement of people's living standards, a large number of pump-type structures are used in submarine and other ship systems, and pipeline transportation, as a key connection link of pump-type structures, is also widely used in the shipbuilding field.

[0003] Low-frequency vibration isolation self-balancing chiral metamaterial pipelines are used for vibration reduction and isolation in pipeline systems for transporting media in ships and submarines. They are primarily placed at the bottom of the pipeline to reduce vibration amplitude. Simultaneously, their unique chiral metamaterial structure provides excellent vibration isolation and sound absorption. During the transport of energy media, the fluid velocity causes vibration and noise in the pipeline structure. This flow-induced vibration and noise negatively impact the stability of pipeline transport. Therefore, it is essential to develop vibration reduction and noise reduction technologies for pipeline systems to address the stability issues of energy transport technology in marine seawater pipeline systems. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of large pipeline vibration and loud noise in actual products, and thus to provide a low-frequency vibration isolation self-balancing chiral metamaterial pipeline.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows:

[0006] A self-balancing chiral metamaterial pipeline for low-frequency vibration isolation includes a pipeline connection structure, an elastic rubber sleeve, and a set of chiral metamaterial structural skeletons. The pipeline connection structure is arranged along the axial direction, and the set of chiral metamaterial structural skeletons is installed on the pipeline connection structure along the axial direction. The elastic rubber sleeve is wrapped around the set of chiral metamaterial structural skeletons and installed on the pipeline connection structure.

[0007] Furthermore, the pipeline connection structure includes two discs, two flanges, multiple flange fixing rods, and multiple connecting rods; the two flanges are arranged in parallel relative to each other, and the two flanges are fixedly connected by multiple flange fixing rods evenly distributed radially; the two discs are arranged opposite each other on both sides of the two flanges; multiple connecting rods are evenly distributed radially on one end face of each flange, and each connecting rod is movably arranged on the end face of the flange through the gap of the hollow shell; the other end of each connecting rod passes through the corresponding flange and is fixedly connected to the disc located away from it.

[0008] Furthermore, the hollow shell is a circular hollow shell, the connecting rod is a circular rod, and one end of the circular rod is machined with a cylindrical protrusion. The cylindrical protrusion of each connecting rod is set in the corresponding hollow shell, and the connecting rod moves along the axial direction of the hollow shell. The connecting rod has a moving gap on the hollow shell, and the hollow shell is welded and fixed to the end face of the corresponding flange.

[0009] Furthermore, the flange fixing rod is welded and fixedly installed on the two flanges at both ends. A circular through hole is machined at one end of the hollow shell. The diameter of the circular protrusion on the connecting rod is larger than the diameter of the circular through hole on the hollow shell. The diameter of the circular through hole on the hollow shell is larger than the diameter of the circular rod body of the connecting rod. The length of the cylindrical protrusion is less than the depth of the hollow shell in the axial direction.

[0010] Furthermore, a set of chiral metamaterial structural frameworks includes two first chiral metamaterial structural frameworks and four second chiral metamaterial structural frameworks; the two first chiral metamaterial structural frameworks are welded and fixedly connected along the axial direction to form a first chiral metamaterial structural framework unit, and every two second chiral metamaterial structural frameworks are welded and fixedly connected along the axial direction to form a second chiral metamaterial structural framework unit. The first chiral metamaterial structural framework unit and the two second chiral metamaterial structural framework units are installed on the pipeline connection structure, and the first chiral metamaterial structural framework unit is located between the two second chiral metamaterial structural framework units.

[0011] Furthermore, each second-chiral metamaterial structural skeleton unit is disposed between a disk and a flange, and the second-chiral metamaterial structural skeleton unit is welded and fixed to the disk and the flange. The first-chiral metamaterial structural skeleton unit is disposed between two flanges, and the first-chiral metamaterial structural skeleton unit is welded and fixed to the two flanges. The centerline of the second-chiral metamaterial structural skeleton unit, the centerline of the first-chiral metamaterial structural skeleton unit, the axis of the disk, and the axis of the flange are all coincident.

[0012] Furthermore, the elastic rubber sleeve is a circular sleeve that wraps around the first chiral metamaterial structural skeleton unit and two second chiral metamaterial structural skeleton units, and the two ends of the elastic rubber sleeve are sealed and installed on the end faces of the two discs.

[0013] Furthermore, the elastic rubber sleeve includes a first chiral metamaterial structural skeleton unit segment and two second chiral metamaterial structural skeleton unit segments. The first chiral metamaterial structural skeleton unit segment is disposed between the two second chiral metamaterial structural skeleton unit segments, and the first chiral metamaterial structural skeleton unit segment is in sealed communication with the two second chiral metamaterial structural skeleton unit segments. The outer diameter of the second chiral metamaterial structural skeleton unit segment is smaller than the outer diameter of the first chiral metamaterial structural skeleton unit segment, and the inner diameter of the second chiral metamaterial structural skeleton unit segment is smaller than the inner diameter of the first chiral metamaterial structural skeleton unit segment. The outer diameter of the second chiral metamaterial structural skeleton unit segment is larger than the inner diameter of the first chiral metamaterial structural skeleton unit segment. A flange mounting groove is machined at the connection point between the second chiral metamaterial structural skeleton unit segment and the first chiral metamaterial structural skeleton unit segment on the outer circular surface of one end of the second chiral metamaterial structural skeleton unit segment.

[0014] Furthermore, the elastic rubber sleeve is made of natural rubber material, which is injected into a set of chiral metamaterial structural frameworks between the two disks.

[0015] Furthermore, the disc, connecting rod, flange, secondary chiral metamaterial structural skeleton unit, primary chiral metamaterial structural skeleton unit, flange fixing rod, and hollow shell are all made of 40Cr.

[0016] The beneficial effects of this invention are:

[0017] I. The pipeline of this invention achieves vibration reduction and noise reduction within a specific operating frequency range. It ensures the sealing and reliability of the connection, and has an extremely wide range of applications.

[0018] Second, the self-balancing property of the pipeline in this application is due to the fact that the pipeline itself has a certain rigidity. Therefore, under a certain internal pressure, the head of the connecting rod 2 is suspended in the hollow shell 7. Thus, when one end is fixed and the other end is free, the other end face can be kept suspended, that is, the self-balancing of its end face position is achieved.

[0019] Third, the vibration isolation effect of this application is achieved by using a periodic structure based on a chiral structure designed with a phononic crystal at the forefront of vibration reduction and noise reduction. Under the coupling resonance and Bragg scattering effect of this chiral structure, the pipe can achieve vibration reduction and noise reduction of the pipeline.

[0020] IV. Compared to conventional pipelines, the outstanding feature of this invention's chiral metamaterial pipeline is its use of a periodic metamaterial microstructure design, which can suppress the transmission characteristics of axial vibration in the low-frequency range. This pipeline structure can be used in practical engineering for low-frequency vibration reduction and isolation. The pipeline configuration of the invention is not limited by placement direction, and can meet the requirements of any working condition that requires axial pipeline vibration isolation and noise reduction, thus possessing a certain degree of universality.

[0021] V. The self-balancing effect of the pipeline in this application can be modified according to the actual required end face displacement effect. Its self-balancing end face displacement is mainly affected by the stiffness determined by its own material and the internal pressure. In actual use, its internal pressure or material can be changed to adjust the appropriate suspension height to adapt to the up and down fluctuation of its end face. Attached Figure Description

[0022] Figure 1 This is a front view of a self-balancing chiral metamaterial pipeline for low-frequency vibration isolation according to the present invention.

[0023] Figure 2 This is an exploded view of a set of chiral metamaterial structural skeletons of the present invention installed in front of the pipeline connection structure.

[0024] Figure 3 The diagram shows the second chiral metamaterial structure framework unit 4. The inner diameter of the annular septum of the chiral metamaterial structure framework is 110 mm, the outer diameter of the annular septum of the chiral metamaterial structure framework is 150 mm, the framework height is 66 mm, the thickness of the annular septum is 2 mm, and the difference between the outer diameter and the inner diameter of the annular septum is 20.20 mm.

[0025] Figure 4 The diagram shows the first chiral metamaterial structure skeleton unit 5. The inner diameter of the annular septum of the chiral metamaterial structure skeleton is 130 mm, the outer diameter of the annular septum of the chiral metamaterial structure skeleton is 170 mm, the skeleton height is 66 mm, the thickness of the annular septum is 2 mm, and the difference between the outer diameter and the inner diameter of the annular septum is 20.15 mm.

[0026] Figure 5 This is a schematic diagram of a chiral ring oscillator in a chiral metamaterial structure framework. The chiral ring oscillator has an inclination angle of 30°, an outer diameter of 20.74 mm, and an inner diameter of 16.60 mm.

[0027] Figure 6 The diagram shows disk 1, which has a diameter of 320mm and a thickness of 20mm.

[0028] Figure 7This is a stepped sectional view of a hollow shell 7 installed on a flange 3. The outer diameter of flange 3 is 320mm, the inner diameter is 107.6mm, the thickness is 20mm, and there are two annular grooves on flange 3. The shell thickness at both ends of the hollow shell 7 is 4mm. The distance between the annular grooves on flange 3 is 5mm, and the depth of the annular grooves on flange 3 is 5mm. Four blind holes for insert flange fixing rods 6 are machined on flange 3, and the depth of the blind holes is 5mm. The diameter of the blind hole is 16mm. There are 4 hollow shells 7 installed on the flange 3. The height of the hollow shell 7 is 20mm. The outer diameter of the hollow shell 7 is 40mm. The diameter of the circular through hole at one end of the hollow shell 7 is 20mm. The height of the circular through hole at one end of the hollow shell 7 is 4mm. The hollow inner cavity of the hollow shell 7 is 32mm. The cavity height of the hollow shell 7 is 12mm. There are 4 through holes for the connecting rod 2 on the flange 3. The diameter of the through hole for the connecting rod 2 on the flange 3 is 40mm.

[0029] Figure 8 The diagram shows the flange fixing rod 6. The flange fixing rod 6 has a diameter of 16mm and a length of 76mm.

[0030] Figure 9 The diagram shows the connecting rod 2. The diameter of the cylindrical protrusion on the connecting rod 2 is 30mm, the height of the cylindrical protrusion on the connecting rod 2 is 10mm, the diameter of the circular rod body of the connecting rod 2 is 16mm, and the length of the circular rod body of the connecting rod 2 is 137mm.

[0031] Figure 10 This is a half-sectional diagram of an elastic rubber sleeve. The inner diameter of the two ends of the elastic rubber sleeve is 100mm, the inner diameter of the middle of the elastic rubber sleeve is 120mm, and the height of the elastic rubber sleeve is 238mm.

[0032] Figure 11 This diagram illustrates the transmission loss of self-balancing chiral metamaterials used for low-frequency vibration isolation pipelines.

[0033] Figure 12 Impedance diagram of a self-balancing chiral metamaterial pipeline used for low-frequency vibration isolation.

[0034] Figure 13 The frequency response diagrams are shown at the input and output ends of a self-balancing chiral metamaterial pipeline used for low-frequency vibration isolation. Detailed Implementation

[0035] Specific implementation method one: Combining Figures 1-10This embodiment describes a self-balancing chiral metamaterial pipeline for low-frequency vibration isolation, comprising a pipeline connection structure, an elastic rubber sleeve, and a set of chiral metamaterial structural skeletons. The pipeline connection structure is arranged along the axial direction, and the set of chiral metamaterial structural skeletons is installed on the pipeline connection structure along the axial direction. The elastic rubber sleeve is wrapped around the set of chiral metamaterial structural skeletons and installed on the pipeline connection structure.

[0036] This application describes the laying of a self-balancing chiral metamaterial pipeline, applicable to low-frequency vibration isolation, under a transport pipeline. Its self-balancing characteristics reduce the vibration of the pipeline transporting the medium, while its unique chiral metamaterial structure absorbs noise, achieving vibration reduction and noise reduction. This application utilizes axial and radial artificial periodic structures to achieve bandgap vibration reduction and noise reduction characteristics, effectively suppressing vibration and reducing noise during pipeline transport. The pipeline structure of this application is rationally designed, simple in configuration and easy to manufacture, exhibiting better vibration reduction and noise reduction effects in the low-frequency range, while also meeting the load-bearing requirements of actual operating conditions. Therefore, the described chiral metamaterial pipeline structure has high applicability.

[0037] This embodiment uses ANSYS software for simulation calculation. The results show that the present invention has excellent vibration isolation effect in the range of 50Hz-100Hz, 150Hz-200Hz, and 500Hz-550Hz.

[0038] Specific Implementation Method Two: Combining Figure 1 , Figure 2 , Figures 6-9 This embodiment describes a self-balancing chiral metamaterial pipeline for low-frequency vibration isolation. The pipeline connection structure includes two discs 1, two flanges 3, multiple flange fixing rods 6, and multiple connecting rods 2. The two flanges 3 are arranged parallel to each other and are fixedly connected by multiple radially evenly distributed flange fixing rods 6. The two discs 1 are arranged opposite each other on both sides of the two flanges 3. Multiple connecting rods 2 are radially evenly distributed on one end face of each flange 3, and each connecting rod 2 is movably disposed on the end face of the flange 3 through a hollow shell 7. The other end of each connecting rod 2 passes through the corresponding flange 3 and is fixedly connected to the disc 1 located away from it. Other methods are the same as in specific embodiment one.

[0039] In this embodiment, the flanges 3 are fixedly connected to each other, and two annular grooves are machined radially on the inner ring surface of the flange 3. The rubber is embedded in the annular grooves to form a closed space made of rubber inside the pipeline.

[0040] Specific implementation method three: Combining Figure 1 , Figure 2 and Figure 7This embodiment describes a self-balancing chiral metamaterial pipeline for low-frequency vibration isolation. The hollow shell 7 is circular, and the connecting rod 2 is a circular rod with a cylindrical protrusion at one end. Each connecting rod 2 has its cylindrical protrusion inside the corresponding hollow shell 7, and the connecting rod 2 moves axially along the hollow shell 7. A movement gap is provided on the connecting rod 2 within the hollow shell 7. The hollow shell 7 is welded and fixed to the end face of the corresponding flange 3. Other methods are the same as in specific embodiment two.

[0041] In this type of pipeline, the connecting rod 2 is spaced apart on the hollow shell 7. When in use, one end of the connecting rod 2 is fixed while the other end is free, and a specific pressure value is applied, so that the free end face of the pipeline achieves a floating effect.

[0042] Specific implementation method four: Combination Figure 1 , Figure 2 , Figure 7 and Figure 8 This embodiment describes a self-balancing chiral metamaterial pipeline for low-frequency vibration isolation. The flange fixing rod 6 is welded and fixed to two flanges 3 at both ends. One end of the hollow shell 7 has a circular through-hole. The diameter of the cylindrical protrusion on the connecting rod 2 is larger than the diameter of the circular through-hole on the hollow shell 7, and the diameter of the circular through-hole on the hollow shell 7 is larger than the diameter of the circular rod body of the connecting rod 2. The length of the cylindrical protrusion is less than the axial depth of the hollow shell 7. Other methods are the same as in specific embodiment three.

[0043] Specific Implementation Method Five: Combining Figures 1-5 This embodiment describes a low-frequency vibration isolation self-balancing chiral metamaterial pipeline. A set of chiral metamaterial structural frames includes two first chiral metamaterial structural frames and four second chiral metamaterial structural frames. Two first chiral metamaterial structural frames are welded and fixedly connected axially to form a first chiral metamaterial structural frame unit 5. Two second chiral metamaterial structural frames are welded and fixedly connected axially to form a second chiral metamaterial structural frame unit 4. The first chiral metamaterial structural frame unit 5 and the two second chiral metamaterial structural frame units 4 are installed on the pipeline connection structure, with the first chiral metamaterial structural frame unit 5 located between the two second chiral metamaterial structural frame units 4. Other methods are the same as in specific embodiment one.

[0044] In this embodiment, the structural dimensions of the first chiral metamaterial structure skeleton are different from those of the second chiral metamaterial structure skeleton. The chiral metamaterial structure skeleton includes a damping ring structure and an annular partition. An annular partition is installed at one end of each damping ring structure. The two damping ring structures are fixedly connected by an intermediate annular partition. The damping ring structure includes chiral ring oscillators arranged radially evenly. Each chiral ring oscillator includes an oscillator ring and two parallel thin plates installed on the oscillator ring. The two parallel thin plates are tangent to the outer circular surface of the oscillator ring. Each end of the thin plates is fixedly installed on the annular partition.

[0045] This embodiment employs a periodic arrangement, utilizing the band gap generated by the structural characteristics to achieve a positive vibration isolation effect within a specific frequency range. This embodiment can reduce the vibration impact of different frequency bands by adjusting the number of periods in the circumferential and axial directions. The chiral ring oscillator in this embodiment can convert part of the axial deformation of the structure into torsional deformation, enhancing the axial compressive strength of the structure while also providing better vibration isolation. This invention uses a circumferential array and an axial array of chiral blade ring structures to form a chiral metamaterial structural skeleton that approximates a spring for vibration reduction.

[0046] Specific Implementation Method Six: Combination Figures 1-5 This embodiment describes a low-frequency vibration isolation self-balancing chiral metamaterial pipeline. Each second chiral metamaterial structural skeleton unit 4 is disposed between a disk 1 and a flange 3, and is welded and fixed to the disk 1 and flange 3. A first chiral metamaterial structural skeleton unit 5 is disposed between two flanges 3, and is welded and fixed to the two flanges 3. The center lines of the second chiral metamaterial structural skeleton units 4, the first chiral metamaterial structural skeleton units 5, the axis of the disk 1, and the axis of the flange 3 are aligned. Other methods are the same as in specific embodiments two or five.

[0047] Specific implementation method seven: Combination Figures 1-5 This embodiment describes a self-balancing chiral metamaterial pipeline for low-frequency vibration isolation. The elastic rubber sleeve is circular and wraps around the first chiral metamaterial structural skeleton unit 5 and two second chiral metamaterial structural skeleton units 4. The ends of the elastic rubber sleeve are sealed and mounted on the end faces of the two discs 1. Other methods are the same as in specific embodiment six.

[0048] Specific implementation method eight: Combination Figure 1 and Figure 10This embodiment describes a low-frequency vibration isolation self-balancing chiral metamaterial pipeline. The elastic rubber sleeve includes a first chiral metamaterial structural skeleton unit segment and two second chiral metamaterial structural skeleton unit segments. The first chiral metamaterial structural skeleton unit segment is positioned between the two second chiral metamaterial structural skeleton unit segments and is sealed and connected to them. The outer diameter of each second chiral metamaterial structural skeleton unit segment is smaller than that of the first chiral metamaterial structural skeleton unit segment, and the inner diameter of each second chiral metamaterial structural skeleton unit segment is smaller than that of the first chiral metamaterial structural skeleton unit segment. The outer diameter of each second chiral metamaterial structural skeleton unit segment is larger than that of the first chiral metamaterial structural skeleton unit segment. A flange 3 mounting groove is machined at the connection point between the second chiral metamaterial structural skeleton unit segment and the first chiral metamaterial structural skeleton unit segment on its outer circumference at one end. Other methods are the same as in specific embodiments one or seven.

[0049] Specific Implementation Method Nine: Combining Figure 1 and Figure 10 This embodiment describes a self-balancing chiral metamaterial pipeline for low-frequency vibration isolation. The elastic rubber sleeve is made of natural rubber and is infused into a chiral metamaterial structural framework between two discs 1. The infusion of soft, natural rubber sound-insulating material integrates the three sections into a single unit. In this embodiment, the chiral metamaterial structural framework, through the periodic repetition of chiral ring oscillators and the filling of rubber, ultimately forms a cylindrical tube of a certain thickness. Natural rubber filler is used to fill both sides of the pipeline framework; its chiral blades couple with the rubber during vibration to absorb energy, thereby achieving noise reduction. Other methods are the same as in specific embodiment eight.

[0050] Specific Implementation Method Ten: Combining Figures 1-2 This embodiment describes a low-frequency vibration isolation self-balancing chiral metamaterial pipeline. The disc 1, connecting rod 2, flange 3, second chiral metamaterial structural skeleton unit 4, first chiral metamaterial structural skeleton unit 5, flange fixing rod 6, and hollow shell 7 are all made of 40Cr. Other methods are the same as in specific embodiment eight.

[0051] Example

[0052] Both the second chiral metamaterial structural skeleton unit 4 and the first chiral metamaterial structural skeleton unit 5 of this application are radially uniformly arranged damping ring structures. By arranging individual damping ring structures radially and embedding them with natural rubber, a cylindrical tube of a certain thickness is ultimately formed. Multiple self-balancing chiral metamaterial pipelines for low-frequency vibration isolation are arranged in a straight axial direction, exhibiting periodic structural bandgap characteristics. The natural rubber is bonded to all components in contact with it; the flange 3 is welded to the chiral metamaterial structural skeleton; the connecting rod 2 is welded to the flange 3; the cylindrical protrusion of the connecting rod 2 is inserted into the hollow shell 7; and the other end of the connecting rod 2 is welded to the flange. The entire inner cavity of the self-balancing chiral metamaterial pipelines for low-frequency vibration isolation is sealed, and the natural rubber coating is integrally molded without gaps.

[0053] The above-described specific implementations can be partially adjusted by those skilled in the art in different ways without departing from the principles and purpose of the present invention. The scope of protection of the present invention is defined by the claims and is not limited to the above-described specific implementations. All implementation schemes within the scope of the claims are bound by the present invention.

Claims

1. A self-balancing chiral metamaterial pipeline for low-frequency vibration isolation, characterized in that: It includes a pipe connection structure, an elastic rubber sleeve, and a set of chiral metamaterial structural frameworks; the pipe connection structure is arranged axially, the set of chiral metamaterial structural frameworks is mounted axially on the pipe connection structure, and the elastic rubber sleeve is wrapped around the set of chiral metamaterial structural frameworks and mounted on the pipe connection structure. The pipeline connection structure includes two discs (1), two flanges (3), multiple flange fixing rods (6), and multiple connecting rods (2); the two flanges (3) are arranged in parallel relative to each other, and the two flanges (3) are fixedly connected by multiple flange fixing rods (6) evenly distributed radially. The two discs (1) are arranged opposite to each other on both sides of the two flanges (3). Multiple connecting rods (2) are evenly distributed radially on one end face of each flange (3), and one end of each connecting rod (2) is movably disposed on the end face of the flange (3) through a hollow shell (7). The other end of each connecting rod (2) passes through the opposite flange (3) and is fixedly connected to the disc (1) located away from it. The hollow shell (7) is a circular hollow shell, and the connecting rod (2) is a circular rod with a cylindrical protrusion at one end. The cylindrical protrusion of each connecting rod (2) is located inside the corresponding hollow shell (7), and the connecting rod (2) moves axially along the hollow shell (7) on the hollow shell (7). The connecting rod (2) has a movement gap on the hollow shell (7), and the hollow shell (7) is welded and fixed to the end face of the corresponding flange (3). A set of chiral metamaterial structural frameworks includes two first chiral metamaterial structural frameworks and four second chiral metamaterial structural frameworks; two first chiral metamaterial structural frameworks are welded and fixedly connected along the axial direction to form a first chiral metamaterial structural framework unit (5), and two second chiral metamaterial structural frameworks are welded and fixedly connected along the axial direction to form a second chiral metamaterial structural framework unit (4). The first chiral metamaterial structural framework unit (5) and the two second chiral metamaterial structural framework units (4) are installed on the pipeline connection structure, and the first chiral metamaterial structural framework unit (5) is located between the two second chiral metamaterial structural framework units (4). Each second chiral metamaterial structural skeleton unit (4) is disposed between a disk (1) and a flange (3), and the second chiral metamaterial structural skeleton unit (4) is welded and fixed on the disk (1) and the flange (3). The first chiral metamaterial structural skeleton unit (5) is disposed between two flanges (3), and the first chiral metamaterial structural skeleton unit (5) is welded and fixed on the two flanges (3). The center line of the second chiral metamaterial structural skeleton unit (4), the center line of the first chiral metamaterial structural skeleton unit (5), the axis of the disk (1) and the axis of the flange (3) are set to coincide.

2. The self-balancing chiral metamaterial pipeline for low-frequency vibration isolation according to claim 1, characterized in that: The flange fixing rod (6) is welded and fixed on the two flanges (3) at both ends. A circular through hole is machined at one end of the hollow shell (7). The diameter of the circular protrusion on the connecting rod (2) is larger than the diameter of the circular through hole on the hollow shell (7). The diameter of the circular through hole on the hollow shell (7) is larger than the diameter of the circular rod body of the connecting rod (2). The length of the cylindrical protrusion is less than the depth of the hollow shell (7) in the axial direction.

3. The self-balancing chiral metamaterial pipeline for low-frequency vibration isolation according to claim 1, characterized in that: The elastic rubber sleeve is a circular sleeve that wraps around the first chiral metamaterial structure skeleton unit (5) and two second chiral metamaterial structure skeleton units (4), and the two ends of the elastic rubber sleeve are sealed and installed on the end faces of the two discs (1).

4. A self-balancing chiral metamaterial pipeline for low-frequency vibration isolation as described in claim 1 or 3, characterized in that: The elastic rubber sleeve includes a first chiral metamaterial structural skeleton unit tube segment and two second chiral metamaterial structural skeleton unit tube segments; the first chiral metamaterial structural skeleton unit tube segment is located between the two second chiral metamaterial structural skeleton unit tube segments, and the first chiral metamaterial structural skeleton unit tube segment is sealed and connected to the two second chiral metamaterial structural skeleton unit tube segments. The outer diameter of the second chiral metamaterial structural skeleton unit tube segment is smaller than the outer diameter of the first chiral metamaterial structural skeleton unit tube segment, the inner diameter of the second chiral metamaterial structural skeleton unit tube segment is smaller than the inner diameter of the first chiral metamaterial structural skeleton unit tube segment, and the outer diameter of the second chiral metamaterial structural skeleton unit tube segment is larger than the inner diameter of the first chiral metamaterial structural skeleton unit tube segment. A flange (3) mounting groove is processed at the connection between the outer circular surface of one end of the second chiral metamaterial structural skeleton unit tube segment and the first chiral metamaterial structural skeleton unit tube segment.

5. The self-balancing chiral metamaterial pipeline for low-frequency vibration isolation according to claim 4, characterized in that: The elastic rubber sleeve is made of natural rubber material and is formed by injecting natural rubber into a set of chiral metamaterial structural skeletons between two discs (1).

6. The self-balancing chiral metamaterial pipeline for low-frequency vibration isolation according to claim 4, characterized in that: The disc (1), connecting rod (2), flange (3), second-chiral metamaterial structural skeleton unit (4), first-chiral metamaterial structural skeleton unit (5), flange fixing rod (6), and hollow shell (7) are all made of 40Cr.

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