A low stiffness spring type support structure tubing for axial vibration isolation

Abstract

A low-rigidity spring support structure pipeline for axial vibration isolation relates to the field of vibration and noise reduction. The present application solves the problems of large vibration and noise during the transportation of the existing pipeline. The present application comprises a support structure pipeline (A), a plurality of flanges and a connecting assembly; the support structure pipeline (A) comprises a rubber coating layer (1) and a plurality of periodic structures (2), the plurality of periodic structures (2) are connected in series from top to bottom, the rubber coating layer (1) is coated on the plurality of periodic structures (2), forming a columnar artificial periodic structure with band gap characteristics, and the periodic structure (2) is a chiral structure; a plurality of flanges are installed on the outer circumferential side wall of the support structure pipeline (A) from top to bottom, and the plurality of flanges are connected through the connecting assembly. The support structure pipeline has low-frequency band gap characteristics and excellent vibration and noise reduction performance. The present application is used in the field of seawater pipeline system of ships, submarines and the like, and realizes low-frequency band gap characteristics by using the periodic unit structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vibration and noise reduction technology, in particular to axial vibration isolation technology, and more particularly to a low-stiffness spring support structure pipeline for axial vibration isolation. BACKGROUND

[0002] Pipeline systems are widely used in military, scientific research and daily life, mainly for transmitting mass flow, momentum flow or energy flow. During operation, pipeline systems are prone to fluid-structure interaction effects, which in turn produce strong vibrations and noise, seriously affecting the safety of connected equipment and the comfort of the surrounding environment, and even causing huge losses. Studying the vibration characteristics of space pipeline systems can provide certain theoretical support and solutions for vibration and noise reduction of pipeline systems. For vibration and noise reduction of pipeline systems, many researchers have proposed various vibration reduction methods and analyzed them. This is of great significance to the improvement of national comprehensive strength, sustainable development of society and comprehensive utilization of resources.

[0003] With the rapid development of modern industrial technology, pipeline transportation systems have become an indispensable part of industrial production and daily life. However, with the widespread use of pipeline systems, the problem of vibration and noise generated during the transportation of media has become increasingly prominent and has become a technical problem that needs to be solved urgently.

[0004] When transporting media, pipeline systems produce a large amount of noise due to the interaction between the fluid and the pipe wall, turbulent flow of the fluid, and vibration of the pipeline system. These noises not only pollute the surrounding environment and affect people's normal life and work, but also can cause damage to the pipeline system itself and shorten its service life. Therefore, how to reduce the vibration and noise during the transportation of media has become an urgent problem to be solved.

[0005] In summary, the existing pipeline has the problems of large vibration and loud noise when transporting media. SUMMARY

[0006] The purpose of the present application is to solve the problem of large vibration and loud noise of the existing pipeline when transporting media, and to provide a low-stiffness spring support structure pipeline for axial vibration isolation.

[0007] The technical solution of the present application is:

[0008] A low-rigidity spring support structure pipeline for axial vibration isolation comprises a support structure pipeline, a plurality of flanges and a connecting assembly; the support structure pipeline comprises a rubber coating layer and a plurality of periodic structures, the plurality of periodic structures are sequentially connected from top to bottom, the rubber coating layer is wrapped on the plurality of periodic structures, and a columnar artificial periodic structure with a band gap characteristic is formed, wherein the periodic structure is a chiral structure framework; the plurality of flanges are installed on the outer circumferential sidewall of the support structure pipeline A from top to bottom, and the plurality of flanges are connected through the connecting assembly.

[0009] Further, the chiral structure framework comprises an upper thin plate, a hollow cylinder, a lower thin plate and two artificial periodic structure layers, the upper thin plate, the hollow cylinder and the lower thin plate are coaxially arranged from top to bottom, and the hollow cylinder is connected with the upper thin plate and the lower thin plate through an artificial periodic structure layer respectively.

[0010] Further, the artificial periodic structure layer comprises a plurality of chiral structure unit cells, and the plurality of chiral structure unit cells are arranged in the form of a ring array, wherein one end of the plurality of chiral structure unit cells is connected with the hollow cylinder, and the other end of the plurality of chiral structure unit cells is connected with the upper thin plate or the lower thin plate.

[0011] Preferably, the chiral structure unit cell comprises a cylinder and two inclined arm branches, and the two inclined arm branches are symmetrically installed on the outer circumferential sidewall of the cylinder.

[0012] Preferably, the number of the plurality of flanges is four, and the plurality of flanges are sequentially a first flange, a second flange, a third flange and a fourth flange from top to bottom.

[0013] Further, the inner ring of the first flange, the second flange, the third flange and the fourth flange is processed with a connecting tooth.

[0014] Further, the outer circumferential sidewall of the rubber coating layer is provided with a connecting groove, and the connecting tooth is clamped in the connecting groove.

[0015] Further, the connecting assembly comprises a hollow sleeve, a hammer-shaped intermittent rod, a solid rod and a high-rigidity spring, the hollow sleeve is installed on the lower end of the first flange, the upper part of the hammer-shaped intermittent rod is clamped in the hollow sleeve, the lower part of the hammer-shaped intermittent rod is connected with the upper end face of the third flange after penetrating through the second flange, the second flange and the third flange are connected through the solid rod, the upper end of the high-rigidity spring is connected with the lower end face of the second flange, and the lower end of the high-rigidity spring is connected with the fourth flange after penetrating through the third flange.

[0016] Further, a gap is left between the upper part of the hammer-shaped intermittent rod and the hollow sleeve in the vertical direction.

[0017] Preferably, the rubber coating layer is made of natural rubber material.

[0018] Compared with the prior art, the present application has the following effects:

[0019] 1. The supporting structure pipeline of the present invention comprises an inner skeleton composed of multiple chiral structures (i.e., periodic structures 2), a soft filler coating (i.e., coating layer 1), three artificial periodic structure layers 2-4 that divide the entire supporting structure pipeline along the axial direction, and intermittent rods, solid rods, and high-stiffness springs that connect the supporting structure pipelines along the axial direction to form a series-parallel structure. All structures cooperate to form a periodic supporting structure pipeline to obtain Bragg scattering bandgap characteristics. Calculations show that this supporting structure pipeline has low-frequency bandgap characteristics and excellent vibration reduction and noise reduction performance.

[0020] 2. This invention is mainly used in the field of seawater pipeline systems for ships, submarines, etc., utilizing its periodic unit structure to achieve low-frequency bandgap characteristics. In addition, this support structure pipeline also has high stiffness characteristics, and the spring structure in the connection makes the axial stiffness of the structure a controllable physical property, enabling the support structure pipeline to meet various working conditions.

[0021] 3. To achieve axial vibration reduction, this invention designs a device comprising six layers of periodic chiral structures, each layer consisting of eight chiral unit cells, thereby efficiently achieving axial vibration reduction. To reduce noise, this invention fills the inner and outer sides of the pipe framework and the gaps between the frameworks with a soft filler layer as a sound insulation layer, effectively reducing sound propagation and achieving a significant noise reduction effect.

[0022] 4. The pipeline of this invention fully utilizes the bandgap characteristics of the periodic structure to achieve vibration reduction and noise reduction at lower frequencies. Its main structural components are made of high-strength 304 steel, ensuring excellent mechanical properties even when subjected to high-pressure, high-flow-rate media transport. Simultaneously, an innovative spring design is used at the external flange connection of the pipeline. This design not only enhances the flexibility and adaptability of the pipeline but also allows users to adjust the spring stiffness to change the overall structural stiffness, thereby achieving precise control over the pipeline's vibration and noise characteristics. Attached Figure Description

[0023] Figure 1 This is a front view of the chiral structure unit cell of the present invention. The parameters used in the calculation are: r1 = 4 mm, r2 = 5 mm, a = 38 mm, b = 40 mm, c = 15.5 mm, d = 2 mm, x1 = 8.

[0024] Figure 2 This is a schematic diagram of the structure when a chiral unit cell is connected to a hollow cylinder 2-2. The parameters used in the calculation are: r1 = 4 mm, r2 = 5 mm, a = 38 mm, b = 40 mm, c = 15.5 mm, d = 2 mm, x1 = 8; e = 6 mm, f = 18 mm, g = 2 mm, h = 31 mm, r3 = 53 mm, r4 = 71 mm.

[0025] Figure 3 is a perspective view of the three-segment periodic chiral structure, and the parameters used in the calculation are: r1=4 mm, r2=5 mm, a=38 mm, b=40 mm, c=15.5 mm, d=2 mm; e=6 mm, f=18 mm, g=2 mm, h=31 mm, r3=53 mm, r4=71 mm; i=40 mm;

[0026] Figure 4 is a structural schematic diagram of multiple flanges.

[0027] Figure 5 is a schematic diagram of the overall structure of the encapsulation layer 1, and the inner ring of the second flange 4 and the third flange 5 is machined with a connecting tooth.

[0028] Figure 6 is Figure 5 is a longitudinal sectional view before the connecting tooth is opened.

[0029] Figure 7 is a three-dimensional sectional view of the hollow sleeve 7 and the hammer-shaped intermittent rod 8 after assembly, and the parameters used in the calculation are: o=148 mm, p=20 mm, q=40 mm, r=10 mm, s=24 mm, r12=10 mm, r13=23 mm, r14=30 mm, r15=12 mm, r16=25 mm, r17=125 mm.

[0030] Figure 8 is a front view of the solid rod 9 installed between the second flange 4 and the third flange 5, and the parameters used in the calculation are: t=68 mm, r18=10 mm, r19=125 mm, θ3=45°.

[0031] Figure 9 is a schematic diagram of one fourth of the overall structure of the present application, except for the high-stiffness spring 10.

[0032] Figure 10 is a schematic diagram of the overall structure of the present application.

[0033] Figure 11 is an exploded view of the overall structure of the present application.

[0034] Figure 12 is a schematic diagram of the vibration isolation result of the low-stiffness spring type support structure pipeline body. Among them, Figure 12 is the transmission loss result under the frequency of 0-1000 Hz, and the transmission of sound energy from one end of the pipeline to the other end is attenuated to different degrees, which can prove that this structure has good vibration reduction and noise reduction performance in the low frequency band (0-1000 Hz) and can produce a band gap.

[0035] Figure 13 is the input and output displacement frequency response diagram. Among them,Figure 13 It is shown that the displacement response output after the structure under the condition of low frequency 0-1000Hz is obviously attenuated. DETAILED DESCRIPTION

[0036] Specific implementation one: combination Figures 1 to 11 In this embodiment, the support structure pipeline A includes a rubber layer 1 and a plurality of periodic structures 2, the plurality of periodic structures 2 are sequentially connected from top to bottom, the rubber layer 1 is wrapped on the plurality of periodic structures 2, forming a columnar artificial periodic structure with band gap characteristics, wherein the periodic structure 2 is a chiral structure skeleton; a plurality of flanges are mounted on the outer circumferential side wall of the support structure pipeline A from top to bottom, and the plurality of flanges are connected through the connecting assembly.

[0037] The embodiment can achieve specific band gap characteristics by adopting axial and annular artificial periodic structures, which can effectively suppress the vibration generated by the pipeline during medium transportation and significantly reduce the noise level. This design strategy provides an efficient vibration and noise reduction solution for the pipeline system.

[0038] The support structure pipeline is a periodic structure, and the soft sound insulation layer, i.e., the rubber layer 1, is wrapped on the chiral structure skeleton of the periodic structure 2 to form a support structure pipeline with a certain thickness, which is sequentially combined from top to bottom as flanges, chiral structure skeletons. The support structure pipeline A contains x layers of chiral structures arranged along the axial direction of the support structure pipeline, and this arrangement has a periodic structure band gap characteristic. The x layers of chiral structures have x periods, and x≥6 to achieve a significant vibration reduction effect of the artificial periodic structure.

[0039] The inner diameter of the support structure pipeline A of the embodiment is r, and the outer diameter is R, and r≥50mm, wherein 20mm≤R-r≤25mm.

[0040] In this embodiment, the structure thickness of the rubber layer 1 of the support structure pipeline A is n=23mm, the inner diameter of the rubber layer 1 is r10=50mm, and the outer diameter is r11=73mm.

[0041] The application utilizes the Bragg band gap characteristics of artificial super material structure to limit the vibration propagation performance in certain frequency range, thereby achieving the purpose of vibration isolation and noise reduction. According to the size of each component in the above embodiment, ANSYS software is used for simulation calculation, and the results show that the application has excellent vibration isolation effect near 600Hz-800Hz, and has multiple band gaps within 0Hz-600Hz.

[0042] The spring support structure pipeline of the embodiment of the application has the characteristics of low rigidity and the characteristic of adjusting rigidity according to the spring, and can inhibit axial vibration transmission characteristics.

[0043] Specific implementation method two: combination Figure 3 In this embodiment, the chiral structure skeleton includes an upper thin plate 2-1, a hollow cylinder 2-2, a lower thin plate 2-3, and two artificial periodic structure layers 2-4. The upper thin plate 2-1, the hollow cylinder 2-2, and the lower thin plate 2-3 are arranged coaxially from top to bottom. The hollow cylinder 2-2 is connected to the upper thin plate 2-1 and the lower thin plate 2-3 through an artificial periodic structure layer 2-4.

[0044] In this way, the chiral structure skeleton is composed of a hollow cylinder and two center-symmetric thin plates. A single periodic chiral structure unit cell is composed of eight chiral structures arranged at uniform intervals. Two layers of chiral structures and three layers of chiral structure support plates (the upper thin plate 2-1, the hollow cylinder 2-2, and the lower thin plate 2-3) are staggered and overlapped to form a period. The support structure pipeline includes three chiral structure periods. The three chiral structure periods in the axial direction and four flange structures are staggered and overlapped to form the main structure of the support structure pipeline. The other components and connection relationships are the same as those in the first embodiment.

[0045] Specific implementation method three: combination Figures 1 to 3 In this embodiment, the artificial periodic structure layer 2-4 includes a plurality of chiral structure unit cells arranged in a ring array. One end of the plurality of chiral structure unit cells is connected to the hollow cylinder 2-2, and the other end is connected to the upper thin plate 2-1 or the lower thin plate 2-3. In this way, a chiral structure unit cell with axial torsional stress can be formed. The other components and connection relationships are the same as those in the first or second embodiment.

[0046] Specific implementation method four: combination Figure 1 In this embodiment, the chiral structure unit cell includes a cylinder 2-5 and two inclined arm braces 2-6. The two inclined arm braces 2-6 are installed on the outer circumferential sidewall of the cylinder 2-5 in axial symmetry.

[0047] In this way, the chiral structure unit cell of the support structure pipeline is a small cylinder cooperated with two inclined arms. The support structure pipeline is a three-dimensional periodic structure, which is divided into two categories. Each layer contains 8 chiral structure unit cells from the circumferential direction. From the axial direction, each chiral structure is sandwiched by the annular plate (the upper thin plate 2-1, the hollow cylinder 2-2 and the lower thin plate 2-3). The overall structure is formed by the chiral structure and the annular support plate arranged alternately to form a periodic structure. The other components and connection relationships are the same as any one of the first to third embodiments.

[0048] In this embodiment, the wall thickness of the cylinder 2-5 is d = 2 mm, the inner diameter of the ring is r1 = 4 mm, the outer diameter is r2 = 5 mm, and the number of chiral structure unit cells in a single layer period is x1 = 8. Taking the center of the cylinder 2-5 as the origin, the coordinates of the chiral part of the chiral structure unit cell are (40, 15.5); (38, 15.5); (-40, -15.5); (38, -15.5). The height of the chiral structure unit cell is h = 31 mm, and the width of the chiral structure is e = 6 mm. The thickness of the support plate of the chiral structure (the hollow cylinder 2-2) is d = 2 mm, the inner diameter of the support plate of the chiral structure is r3 = 53 mm, and the outer diameter is r4 = 71 mm. Each period contains three layers of chiral structure support plates and two layers of chiral structures. There are a total of three layers of chiral structures, and the distance between each layer is i = 40 mm.

[0049] In this embodiment, the thickness of the chiral structure cylinder 2-5 and the inclined arm 2-6 is a, a ≥ 1.5 mm, to ensure the strength of the structural framework. The angle between the inclined arm 2-6 and the hollow cylinder 2-2 is θ, 10° ≤ θ ≤ 50°. The inclined chiral structure framework has the function of converting axial force into torsional force, and has the function of reducing vibration. Along the circumferential direction, n chiral structure unit cells are uniformly arranged, and n ≥ 8. It has the functions of connection, vibration reduction and support.

[0050] Specific embodiment five: combination Figure 4 In this embodiment, the number of flanges is 4, and they are sequentially arranged from top to bottom as the first flange 3, the second flange 4, the third flange 5 and the fourth flange 6.

[0051] In this way, the present application has four layers of flanges, which are sequentially arranged from top to bottom as the first flange, the second flange, the third flange and the fourth flange. The second flange and the third flange are directly connected by a solid rod. The first flange and the third flange are connected by an intermittent rod composed of a hammer-shaped rod and a sleeve. The second flange and the fourth flange are connected by a high-stiffness spring. The other components and connection relationships are the same as any one of the first to fourth embodiments.

[0052] In this embodiment, the structural height of the pipeline flange is j = 40 mm,

[0053] Specific embodiment six: combinationFigure 4 In this embodiment, the inner ring of the first flange 3, the second flange 4, the third flange 5 and the fourth flange 6 are all processed with connecting teeth.

[0054] In this way, for the connection problem of the structure, the flange is welded with the support structure pipeline A, and in order to ensure the tight connection of the rubber coating and the flange structure, the flange is designed with a groove, so that the rubber coating and the flange realize physical occlusion, and have better sealing effect. The other components and connection relationship are the same as any one of the first to fifth specific embodiments.

[0055] Among them, the inner ring of the middle two layers of flange structure is processed into a tooth shape (that is, the connecting teeth in the groove design), the tooth profile height is k=8mm, the width is l=5mm, so the inner diameter of the flange is r5=55mm, r6=60mm, the outer diameter r7=160mm. The middle two layers of flange are designed with a hole for connection with the flanges on both sides, the hole penetrates the flange, so the hole depth is m=40mm, the hole inner diameter is r8=10mm, the hole center to the pipeline axis distance is r9=125mm, the deflection angle is θ1=22.5°, θ2=67.5°, and all the holes are 45° apart.

[0056] Specific embodiment seven: in combination Figure 4 In this embodiment, the outer circumferential side wall of the rubber coating 1 is provided with a connecting groove, and the connecting teeth are clamped in the connecting groove. In this way, it is convenient to cooperate with the connecting teeth and ensure the sealing effect. The other components and connection relationship are the same as any one of the first to sixth specific embodiments.

[0057] Specific embodiment eight: in combination Figure 11 In this embodiment, the connecting assembly includes a hollow sleeve 7, a hammer-shaped intermittent rod 8, a solid rod 9 and a high-stiffness spring 10. The hollow sleeve 7 is installed on the lower end of the first flange 3, the upper part of the hammer-shaped intermittent rod 8 is clamped in the hollow sleeve 7, the lower part of the hammer-shaped intermittent rod 8 is connected with the upper end face of the third flange 5 after penetrating through the second flange 4, the second flange 4 and the third flange 5 are connected through the solid rod 9, the upper end of the high-stiffness spring 10 is connected with the lower end face of the second flange 4, and the lower end of the high-stiffness spring 10 is connected with the fourth flange 6 after penetrating through the third flange 5.

[0058] In this way, the two layers of flanges in the middle are connected by pull rods, and circular holes are evenly opened to facilitate the connection of the pull rods of the flanges on both sides with the flanges on the other side; the first flange and the third flange are connected by intermittent rods; the second flange and the fourth layer of flange are connected by high-stiffness springs, the intermittent rod is composed of a hollow sleeve and a hammer-shaped intermittent rod; the gaps in the chiral structure and the gaps in the flange structure are filled with rubber coating structures.

[0059] The chiral structure cell and the chiral structure support plate are connected by welding, the chiral structure support plate and the flange are connected by welding, the flange structure and the pull rod are connected by welding, the flange structure and the high-rigidity spring are connected by welding, and all the structures and the filling encapsulation layer are connected by friction contact.

[0060] The inner diameter of the flange structure and the inner diameter of the chiral structure support plate structure differ by a fixed length.

[0061] The hollow sleeve 7 and the hammer-shaped intermittent rod 8 in the embodiment have the following structure: the length of the hammer-shaped rod o is 148 mm, the length of the hammer-shaped boss p is 20 mm, the height of the hollow sleeve q is 40 mm, the length of the hollow sleeve recess r is 10 mm, the length of the hollow sleeve interior s is 24 mm, the radius of the hammer-shaped rod r12 is 10 mm, the radius of the hammer-shaped boss r13 is 23 mm, the outer diameter of the hollow sleeve r14 is 30 mm, the diameter of the hollow sleeve recess r15 is 12 mm, the diameter of the hollow sleeve interior r16 is 25 mm, the distance between the axis of the hollow sleeve and the hammer-shaped intermittent rod 8 and the axis of the pipeline r17 is 125 mm, the deflection angle θ1 is 22.5°, the deflection angle θ2 is 67.5°, the height of the solid rod structure between the second flange and the third flange t is 68 mm, the radius of the rod r18 is 10 mm, the distance between the axis of the rod and the axis of the pipeline r19 is 125 mm, and the deflection angle θ3 is 45°.

[0062] In summary, the embodiment of the application has lower axial rigidity than a common bellows pipeline due to the existence of the intermittent rod and the spring, the specific structural rigidity can be continuously adjusted according to the rigidity of the spring, the self-balancing structure can be controlled to be within 3 mm, and the structure has good self-balancing and rigidity results.

[0063] Specific embodiment nine: combination Figure 7In this embodiment, a gap is left between the upper part of the hammer-shaped intermittent rod 8 and the hollow sleeve 7 in the vertical direction. In this way, the low-stiffness spring support structure pipeline for axial vibration isolation designed in this embodiment is provided. The first and third flanges and the second and fourth flanges of the four-layer flange structure are connected by intermittent rods and springs, respectively. The second and third flanges are connected by a solid rod. In the process of measuring the axial stiffness, the first flange is first subjected to tension, which is transmitted to the third flange through the intermittent rod. The third flange and the second flange are connected by a solid rod, so the second flange will eventually be subjected to the transmitted tension and transmitted to the fourth flange through the high-stiffness spring. Since the chiral structure in the pipeline structure greatly reduces the axial stiffness of the pipeline structure, the structure itself has very small stiffness without the tension rod. Therefore, even after adding the tension rod, the overall pipeline structure can still maintain a stiffness of less than 2000 N / mm under a tension of 10 MPa. During the stretching process, the second and third flanges will produce an axial displacement of about 0.5 mm under an internal pressure of 10 MPa due to the effect of the chiral structure. The first and third flanges are connected by an intermittent rod, and the gap of the intermittent rod is 2 mm. Finally, the first flange will produce an axial deformation of about 2.5 mm, and the overall structure will have a self-balancing result within 3 mm. The other components and connection relationships are the same as any one of embodiments 1 to 8.

[0064] Specific implementation ten: in combination Figure 5 and Figure 6 In this embodiment, the encapsulation layer 1 is made of natural rubber. In this way, the axial movement of the support structure pipeline body is limited. The first flange is connected to the hollow sleeve, the third flange is connected to the hammer-shaped rod, and there is a gap between the hammer-shaped rod and the sleeve. The size of the gap limits the axial movement of the support structure pipeline. The other components and connection relationships are the same as any one of embodiments 1 to 9.

[0065] The sound insulation layer uses natural rubber as the main material, and the internal filling design aims to achieve excellent sound insulation effect and provide support and sealing function to a certain extent. According to the sizes of the components in the above embodiment, ANSYS software is used for simulation calculation. The material encapsulation structure has a density of 1150 kg / m3, and the other components are made of 304 steel with a density of 7930 kg / m3.

[0066] The entire support structure pipeline uses 304 steel material except for the soft sound insulation layer made of natural rubber. This includes flanges, chiral structure skeletons, and solid tension rods, and the connections between them all use welding technology to ensure the stability of the entire support structure pipeline.

[0067] In combination Figures 1 to 13To illustrate the working principle of the present application:

[0068] Pipelines transporting fluids, such as hydraulic systems working fluids, will be subjected to forces such as pressure, vibration, etc. Excessive stiffness may cause stress concentration or local deformation of the pipeline when subjected to force, thereby increasing the risk of pipeline rupture or leakage. In contrast, low stiffness pipelines can better adapt to the action of these forces, reduce stress concentration and local deformation, and improve the safety and reliability of the pipeline. In addition, low stiffness pipelines can better absorb and disperse external impacts and vibrations, protecting equipment and extending the service life of the pipeline. At the same time, low stiffness also gives the pipeline better flexibility and deformability, making it more flexible and convenient to design and install, and able to adapt to different installation environments and space limitations.

[0069] Based on the above background, the present application designs a low-stiffness spring support structure pipeline for axial vibration isolation. The pipeline adopts a chiral structure periodic arrangement to form the main skeleton, which has low stiffness in the axial direction. Through reasonable structural design such as springs, intermittent rods, and chiral structure skeletons, the pipeline effectively absorbs and suppresses the vibration of the pipeline system when transporting media, reducing the generation and propagation of noise.

[0070] The above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent substitutions for part of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A low-stiffness spring-type support structure pipeline for axial vibration isolation, characterized in that: It includes supporting piping (A), multiple flanges, and connection assemblies; The supporting structure pipeline (A) includes an adhesive layer (1) and multiple periodic structures (2). The multiple periodic structures (2) are connected in series from top to bottom. The adhesive layer (1) covers the multiple periodic structures (2) to form a columnar artificial periodic structure with band gap characteristics. Among them, the periodic structure (2) is a chiral structure skeleton. Multiple flanges are installed from top to bottom on the outer circumferential sidewall of the supporting structure pipeline (A), and the multiple flanges are connected by a connecting assembly; The chiral structural framework includes an upper thin plate (2-1), a hollow cylinder (2-2), a lower thin plate (2-3), and two artificial periodic structural layers (2-4). The upper thin plate (2-1), the hollow cylinder (2-2), and the lower thin plate (2-3) are arranged coaxially from top to bottom. The hollow cylinder (2-2) is connected to the upper thin plate (2-1) and the lower thin plate (2-3) through an artificial periodic structural layer (2-4). The artificial periodic structure layer (2-4) includes multiple chiral structural units, which are arranged in a ring array. One end of each chiral structural unit is connected to a hollow cylinder (2-2), and the other end of each chiral structural unit is connected to an upper thin plate (2-1) or a lower thin plate (2-3). The connecting assembly includes a hollow sleeve (7), a hammer-shaped interrupted rod (8), a solid rod (9), and a high-stiffness spring (10). The hollow sleeve (7) is installed on the lower end of the first flange (3). The upper part of the hammer-shaped interrupted rod (8) is fitted inside the hollow sleeve (7). The lower part of the hammer-shaped interrupted rod (8) passes through the second flange (4) and connects to the upper end face of the third flange (5). The second flange (4) and the third flange (5) are connected by the solid rod (9). The upper end of the high-stiffness spring (10) is connected to the lower end face of the second flange (4). The lower end of the high-stiffness spring (10) passes through the third flange (5) and connects to the fourth flange (6). A gap is left in the vertical direction between the upper part of the hammer-shaped interrupted rod (8) and the hollow sleeve (7).

2. The low-stiffness spring-type support structure pipeline for axial vibration isolation according to claim 1, characterized in that: The chiral structural unit cell consists of a cylinder (2-5) and two oblique arms (2-6), which are mounted axially symmetrically on the outer circumferential sidewall of the cylinder (2-5).

3. A low-stiffness spring-type support structure pipeline for axial vibration isolation according to claim 2, characterized in that: There are four flanges, which are arranged from top to bottom as the first flange (3), the second flange (4), the third flange (5), and the fourth flange (6).

4. A low-stiffness spring-type support structure pipeline for axial vibration isolation according to claim 3, characterized in that: The inner rings of the first flange (3), the second flange (4), the third flange (5), and the fourth flange (6) are all machined with connecting teeth.

5. A low-stiffness spring-type support structure pipeline for axial vibration isolation according to claim 4, characterized in that: A connecting groove is provided on the outer circumferential sidewall of the coating layer (1), and the connecting teeth are fitted into the connecting groove.

6. A low-stiffness spring-type support structure pipeline for axial vibration isolation according to claim 5, characterized in that: The overlay (1) is made of natural rubber.

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