Pipeline noise reduction device and ship seawater pipeline system

Abstract

The invention relates to a pipeline noise reduction device and a ship seawater pipeline system, and belongs to the technical field of ship seawater pipeline systems.The pipeline noise reduction device comprises a plurality of local resonance assemblies and a supporting structure, and the local resonance assemblies are arranged in the length direction of a pipeline and used for generating a resonance effect at a low-frequency band and forming a wide-frequency-band vibration band gap; the supporting structure is arranged at the position of the local resonance assembly and used for connecting the local resonance assembly to the pipeline, on the premise that the size and the weight of the pipeline system are not remarkably increased, medium-high frequency and low frequency vibration of the pipeline can be effectively reduced, the vibration and noise reduction effect of the pipeline system is improved, and the pipeline system is suitable for being popularized and used. The problem that a traditional noise reduction device is poor in low-frequency control effect can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship seawater pipeline systems, and in particular to a pipeline noise reduction device and a ship seawater pipeline system. Background Art

[0002] Marine machinery and equipment are the various mechanical devices and systems used to support, maintain, and improve the ship's operational efficiency. These include power systems, transmission systems, cooling systems, propulsion systems, and piping systems. The design and operation of these equipment directly impact the ship's performance, safety, and comfort. The seawater piping system is a crucial component of marine machinery and equipment, primarily responsible for transporting seawater to critical facilities such as the ship's cooling, ballast, and firefighting systems. However, during operation, high low-frequency vibrations and noise often occur within the piping system due to excitations caused by fluid pulsation, mechanical vibration, and equipment operation. These vibrations and noise not only damage the piping system itself and shorten its service life, but can also radiate outward through the pipe walls, affecting the ship's overall acoustic performance. Furthermore, these vibrations and noise can be transmitted into the ship's interior, disrupting the crew's work and living environment and even affecting the normal operation of sensitive equipment. Therefore, effectively controlling and reducing the vibration and noise of seawater piping systems has become a critical technical issue that needs to be addressed in the field of marine engineering.

[0003] Currently, common noise reduction methods for controlling noise and vibration in ship seawater piping systems include adding damping materials to the outer surface of the pipes, installing silencers, soundproof enclosures, and vibration isolation pads. Adding damping materials increases the damping coefficient of the pipes, thereby reducing vibration amplitude and noise radiation. Installing silencers attenuates noise, while installing soundproof enclosures and vibration isolation pads reduces the transmission of vibration and noise.

[0004] However, in actual use, these noise reduction devices are either limited in effectiveness at low frequencies, difficult to install, occupy a large space, and significantly increase the volume and weight of the pipe. Currently, there is no publicly available technical solution for effectively reducing low- and medium-frequency vibration and noise without significantly increasing the pipe's volume and weight. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a pipeline noise reduction device to solve the technical problem in the prior art of how to effectively reduce medium and low frequency vibrations and noise without significantly increasing the volume and weight of the pipeline.

[0006] The present invention provides a pipeline noise reduction device, comprising:

[0007] The local resonance component is provided with a plurality of resonance units with a frequency gradient distribution and arranged along the length of the pipeline, which is used to generate a resonance effect in the low frequency band and form a vibration band gap in the wide frequency band;

[0008] a supporting structure, disposed at the local resonance component, and used to connect the local resonance component to a pipeline;

[0009] The multi-layer sound-absorbing component is arranged at the pipe mouth to attenuate and absorb sound wave energy.

[0010] Optionally, the local resonance component includes:

[0011] The sound-absorbing shell is used to absorb the sound wave energy of the pipeline and has multiple accommodating cavities inside;

[0012] A mass block is disposed in the accommodating cavity and is used to provide the inertial mass of the resonance unit;

[0013] The elastic support body is arranged in the accommodating cavity and is used to provide elastic restoring force for the resonance unit.

[0014] Optionally, the sound-absorbing shell is arranged in an annular shape, the sound-absorbing shell is sleeved on the pipe, the mass block and the elastic support body are arranged along the annular direction of the sound-absorbing shell, and the frequency of the resonance unit formed by the mass block and the elastic support body is gradiently distributed.

[0015] Optionally, a gap is left between the sound-absorbing shell and the pipe.

[0016] Optionally, the support structure includes a connector provided between the local resonance component and the pipeline, and at least two connectors are provided, and the connectors are detachably connected to the local resonance component and the pipeline respectively.

[0017] Optionally, the connecting member includes a first end and a second end, wherein the first end and the second end correspond to the pipe and the local resonance component respectively;

[0018] At least one screw hole is provided on each of the first end and the second end, and a bolt member is provided on each of the first end and the second end. The bolt members are threaded into the screw holes in sequence, and the bolt member on the first end and the bolt member on the second end are threaded into the pipe and the local resonance component in sequence, thereby connecting the local resonance component to the pipe.

[0019] Optionally, the multi-layer sound absorbing assembly includes a honeycomb structure layer, a porous sound absorbing layer and / or a micro-perforated plate layer, wherein:

[0020] The porous sound absorbing layer and the micro-perforated plate layer are respectively arranged on both sides of the honeycomb structure layer. The honeycomb structure layer supports the porous sound absorbing layer and the micro-perforated plate layer and disperses energy. The porous sound absorbing layer is used to absorb low-frequency sound wave energy, and the micro-perforated plate layer is used to absorb medium and high-frequency vibrations.

[0021] Optionally, the porous sound absorbing layer is arranged on the side of the honeycomb structure layer facing the pipe orifice, and the micro-perforated plate layer is arranged on the side of the honeycomb structure layer facing away from the pipe orifice.

[0022] Optionally, the mass block is made of a high-density metal material, the elastic support body is made of a high-elasticity rubber or polyurethane material, and the sound-absorbing shell is composed of a rigid perforated outer wall and an inner flexible porous sound-absorbing material.

[0023] The present invention also provides a ship seawater pipeline system, comprising a pipeline and the pipeline noise reduction device, wherein the pipeline noise reduction device is arranged on the pipeline.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. The pipeline noise reduction device provided by the present invention forms a periodic local resonance structure on the pipeline by introducing a local resonance component on the pipeline, effectively utilizing the band gap effect of the acoustic metamaterial in a specific low-frequency band, thereby forming a wide-band vibration band gap inside the pipeline, preventing low-frequency vibration from propagating along the pipeline. By setting up a multi-layer sound-absorbing component, it can effectively attenuate and absorb low-, medium- and low-frequency vibration noise. The entire structure is compact and easy to install. It can be quickly installed and replaced directly through the support structure. Only a few local resonance components are set along the length of the pipeline, which will not cover the entire pipeline and occupy a small space. It can effectively reduce the medium- and low-frequency vibration of the pipeline without significantly increasing the volume and weight of the pipeline system, thereby improving the vibration and noise reduction effect of the pipeline system. It can effectively solve the problem that traditional noise reduction devices are not effective in low-frequency control, and at the same time meet the noise control needs of ship seawater pipeline systems under various complex working conditions.

[0026] 2. The pipeline noise reduction device provided by the present invention has a gradient distribution of the frequency of the local resonance component, which will produce multiple adjacent local resonance band gaps. These band gaps will merge under a certain damping effect, thereby producing a wider continuous vibration suppression frequency band. While ensuring the low-frequency vibration suppression characteristics of the local resonance structure itself, its vibration suppression frequency band is greatly widened, so that the vibration propagating along the pipeline is attenuated within a wider frequency band, further improving the medium and low-frequency broadband vibration and noise reduction effect of the pipeline system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 Schematic diagram of the overall structure of the pipeline noise reduction device of the present invention;

[0029] Figure 2 This is an explosion diagram of the pipeline noise reduction device of the present invention;

[0030] Figure 3 is a cross-sectional view of the internal structure of the local resonance component of the present invention;

[0031] Figure 4 is a schematic diagram of a connecting member in the present invention;

[0032] Figure 5 It is a cross-sectional view of the internal structure of the multi-layer sound absorbing component in the present invention.

[0033] Description of reference numerals:

[0034] 1. Pipe; 2. Local resonance component; 21. Sound-absorbing shell; 22. Mass block; 23. Elastic support body; 3. Support structure; 31. Connector; 311. First end; 312. Second end; 313. Screw hole; 314. Bolt member; 4. Multi-layer sound-absorbing component; 41. Honeycomb structure layer; 42. Porous sound-absorbing layer; 43. Micro-perforated plate layer. DETAILED DESCRIPTION

[0035] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, and not all, of the embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the description of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0036] Unless otherwise specified or limited, the terms "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances.

[0037] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0038] The terms "first," "second," "third," etc. are merely used to distinguish elements of similar nature and do not indicate or imply relative importance or a particular order.

[0039] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0040] Example 1

[0041] Reference Figure 1-Figure 5 As shown, the present invention provides a pipeline noise reduction device, including a local resonance component 2 and a support structure 3, wherein a plurality of local resonance components 2 are provided. In this embodiment, the number of local resonance components 2 is not limited and can be adjusted according to the length of the pipeline 1. Multiple local resonance components 2 are arranged along the length direction of the pipeline 1. The local resonance components 2 are used to generate a resonance effect in a low-frequency band and form a vibration band gap in a wide-frequency band. The support structure 3 is provided at the local resonance component 2 and is used to connect the local resonance component 2 to the pipeline 1. The number of support structures 3 can be determined according to the number of local resonance components 2 to ensure that the support structures 3 and the local resonance components 2 correspond one to one, and to ensure that each local resonance component 2 can be connected to the pipeline 1 through the support structure 3.

[0042] By introducing the local resonance component 2 on the pipeline 1, a periodic local resonance structure is formed on the pipeline 1, and the resonance effect of the acoustic metamaterial in a specific low-frequency band is effectively utilized to form a wide-band vibration band gap inside the pipeline 1, thereby preventing low-frequency vibration from propagating along the pipeline 1. The entire structure is compact and easy to install. It can be quickly installed and replaced directly through the support structure 3. In addition, only a few local resonance components 2 need to be arranged along the length of the pipeline 1, and the entire pipeline will not be covered. The space occupied is small. Under the premise of not significantly increasing the volume and weight of the pipeline system, the low-frequency vibration of the pipeline 1 can be effectively reduced, thereby improving the vibration and noise reduction effect of the pipeline system.

[0043] The local resonance component 2 can adapt to pipes 1 of different diameters and shapes. Compared with traditional damping materials and muffler designs, it can better control low-frequency vibrations and noise in the range of 20Hz-200Hz, greatly reducing the vibration transmission and noise radiation of the pipeline 1 system. Compared with sound insulation covers and vibration isolation pads, it will not significantly increase the volume and weight of the pipeline system. It can effectively solve the problem of poor low-frequency control effect of traditional noise reduction devices, and at the same time meet the noise control needs of ship seawater pipeline systems under various complex working conditions.

[0044] As a specific implementation method, refer to Figure 1 and Figure 2 As shown, the pipeline noise reduction device also includes a multi-layer sound absorbing component 4, which is arranged at the pipe mouth of the pipeline 1 for attenuating and absorbing sound wave energy. Through the combined design of the local resonance component 2 and the multi-layer sound absorbing component 4, a wide-band vibration band gap and an efficient sound absorbing structure can be formed. Without significantly increasing the volume and weight of the pipeline system, the purpose of further effectively suppressing low-frequency vibration and sound wave propagation is achieved, thereby further improving the vibration reduction and noise reduction effect of the pipeline system.

[0045] Specifically, multiple local resonance components 2 are evenly arranged along the length direction of the pipeline 1. During the installation work, the positions and quantities of the multiple local resonance components 2 are adjusted according to the specific size and vibration characteristics of the pipeline 1. Furthermore, the spacing between adjacent local resonance components 2 is set between 120 mm and 160 mm, thereby ensuring that the local resonance components 2 match the main low-frequency vibration frequency of the pipeline 1, forming an effective vibration band gap, suppressing the propagation of low-frequency vibration to the greatest extent, and ensuring that the effect of the local resonance components 2 can act on all parts of the pipeline 1. At the same time, while ensuring that the vibration reduction and noise reduction effect of the pipeline 1 remains unchanged, the number of local resonance components 2 is reduced to avoid an excessive number of local resonance components 2 and an excessive increase in the weight of the pipeline system.

[0046] As a specific implementation method, refer to Figure 2 and Figure 3 As shown, the local resonance assembly 2 includes a sound-absorbing shell 21, a mass 22, and an elastic support body 23. The sound-absorbing shell 21 is used to absorb the sound wave energy of the pipeline. The sound-absorbing shell 21 is arranged in an annular shape and is mounted on the pipeline 1. The sound-absorbing shell 21 is provided with multiple cavities. The number of mass blocks 22 and elastic support bodies 23 is set corresponding to the number of cavities, and each mass block 22 and elastic support body 23 is located in one of the cavities, ensuring that each cavities can accommodate a mass block 22 and elastic support body 23. In addition, the cavities are evenly arranged along the annular direction of the sound-absorbing shell 21, so that the mass blocks 22 and elastic support bodies 23 are arranged along the annular direction of the sound-absorbing shell 21, ensuring the optimal working effect of the local resonance assembly 2.

[0047] The mass block 22 is made of a high-density metal material, such as steel or tungsten alloy, and the weight of each mass block is not exactly the same. The elastic support body 23 is made of a highly elastic rubber or polyurethane material, and the dimensions or material parameters are not exactly the same, thereby providing different elastic restoring forces, so that the frequencies of the resonant units composed of the mass block 22 and the elastic support body 23 are distributed in a gradient. The sound-absorbing shell 21 is composed of a rigid perforated outer wall and an inner flexible porous sound-absorbing material filling, such as sound-absorbing cotton or open-cell foam plastic, which is used to absorb vibration noise from the pipeline. In this embodiment, the diameter of the mass block 22 ranges from 10-20 mm and the height is 20 mm. The diameter of the elastic support body 23 ranges from 5-10 mm and the height is 30 mm. The outer diameter of the sound-absorbing shell 21 is 620 mm, the inner diameter is 560 mm, and the thickness is 30 mm.

[0048] By adjusting the weight of the mass block 22, the stiffness of the elastic support body 23 and the material properties of the sound-absorbing shell 21, the resonant frequency of the local resonance component 2 can be adjusted to the main low-frequency vibration range in the pipeline system, such as 50Hz to 200Hz, thereby forming a wide-band vibration band gap, effectively preventing the propagation of low-frequency vibrations in the pipeline 1. When the vibration wave is transmitted to the local resonance component 2, the vibration energy is localized, thereby significantly reducing the vibration intensity propagating along the pipeline 1.

[0049] As a specific implementation method, refer to Figure 1 and Figure 4 As shown, the support structure 3 includes a connector 31 arranged between the local resonance component 2 and the pipeline 1. At least two connectors 31 are provided. The number of connectors 31 is again not limited. In the present embodiment, two connectors 31 are provided. The connectors 31 are detachably connected to the sound-absorbing shell 21 of the local resonance component 2 and the outer wall of the pipeline 1 respectively. The installation can be achieved through the connector 31, which is convenient for rapid installation and replacement of the local resonance component 2 in the pipeline system. The installation is convenient and easy to disassemble and maintain. The installation position of the connector 31 on the pipeline 1 can be adjusted to ensure that when the connector 31 is set on the pipeline 1, it will not affect the normal function and fluid transmission of the pipeline 1.

[0050] Specifically, the connecting member 31 is made of high-strength stainless steel material. The connecting member 31 can be set to an L-shaped or T-shaped structure. In this embodiment, the connecting member 31 includes a first end 311 and a second end 312. The first end 311 and the second end 312 are vertically arranged. The first end 311 and the second end 312 correspond to the pipe 1 and the local resonance component 2 respectively. Two screw holes 313 are provided on the first end 311 and the second end 312. The two screw holes 313 on the first end 311 are arranged along the length direction of the first end 311, and the two screw holes 313 on the second end 312 are arranged along the length direction of the second end 312. Bolts 314 are provided on the first end 311 and the second end 312. 4 is set as a fixing bolt. During installation, the connecting member 31 is first placed between the pipe 1 and the sound absorbing shell 21, with the first end 311 in contact with the pipe 1 and the second end 312 in contact with the inner annular surface of the sound absorbing shell 21. The bolt member 314 is then removed and threaded into the screw hole 313 from the first end 311 facing away from the pipe 1 and into the outer wall of the pipe 1, thereby connecting the connecting member 31 to the pipe 1. The bolt member 314 is then removed and threaded into the screw hole 313 from the second end 312 facing away from the sound absorbing shell 21 and threadedly connected to the sound absorbing shell 21, thereby achieving a detachable connection between the sound absorbing shell 21 and the pipe 1, ensuring a stable connection in a high vibration environment.

[0051] As a specific implementation method, refer to Figure 1 and Figure 5 As shown, the multi-layer sound absorbing component 4 is arranged in an annular shape and includes a honeycomb structure layer 41, a porous sound absorbing layer 42 and a micro-perforated plate layer 43, wherein the porous sound absorbing layer 42 is composed of a foam material with a high porosity, such as foam aluminum or porous polyurethane, and the thickness of the porous sound absorbing layer 42 is 30 mm. It is mainly used to absorb the remaining low-frequency sound wave energy, such as sound wave energy below 50 Hz, and further effectively suppress low-frequency vibration and sound wave propagation. The micro-perforated plate layer 43 is made of stainless steel or aluminum alloy material, with a thickness of 5 mm, a pore size of 0.5 mm, and a porosity of 20%-30%. By optimizing the setting of the porosity, it can effectively attenuate and absorb medium and high frequency vibration noise. The honeycomb structure layer 41 is made of aluminum honeycomb or composite material and has a thickness of 15 mm. It can provide structural support and absorb and disperse sound wave energy in multiple frequency bands.

[0052] Specifically, the porous sound absorbing layer 42 and the micro-perforated plate layer 43 are respectively arranged on both sides of the honeycomb structure layer 41. The honeycomb structure layer 41 supports the porous sound absorbing layer 42 and the micro-perforated plate layer 43 and disperses energy. The honeycomb structure layer 41, the porous sound absorbing layer 42 and the micro-perforated plate layer 43 are fixed together by adhesive and bolts to form an integrated sound absorbing barrier, which effectively improves the multi-band noise attenuation effect at the pipe mouth, especially the joint control effect of low-frequency and medium-high frequency noise. The entire multi-layer sound absorbing component 4 is fixed to the pipe 1 at the pipe 1 and connected to the pipe mouth wall by bolts, and the multi-layer sound absorbing component 4 is set to a ring shape, which will not affect the normal use of the pipe 1. Through the combination of the local resonance component 2 and the multi-layer sound absorbing component 4, the vibration wave is effectively suppressed and dissipated during the propagation of the pipe 1, especially the low-frequency noise, thereby significantly reducing the noise radiation at the pipe mouth and improving the overall noise reduction effect of the pipeline system.

[0053] In addition, the porous sound-absorbing layer 42 is arranged on the side of the honeycomb structure layer 41 facing the pipe mouth of the pipe 1, and the micro-perforated plate layer 43 is arranged on the side of the honeycomb structure layer 41 facing away from the pipe mouth of the pipe 1. The porous sound-absorbing layer 42 is used to absorb the remaining low-frequency sound wave energy. Setting it at a position close to the pipe mouth of the pipe 1 can achieve better results, while the micro-perforated plate layer 43 is used for further sound insulation and reflection. Setting it at a position far away from the noise source can achieve better results.

[0054] In other embodiments, the multi-layer sound absorbing assembly 4 may also be provided with only a porous sound absorbing layer 42 or a micro-perforated plate layer 43 on the honeycomb structure layer 41. In this embodiment, the porous sound absorbing layer 42 and the micro-perforated plate layer 43 are collectively provided on the honeycomb structure layer 41, which effectively improves the multi-band noise attenuation effect at the pipe mouth, especially the joint control effect of low-frequency and medium-high frequency noise.

[0055] In this embodiment, the local resonance unit, multi-layer sound absorption assembly 4, and support structure 3 are all manufactured from corrosion-resistant, fatigue-resistant, high-strength composite materials. These materials enable long-term, stable operation in complex environments, significantly improving the device's economical and engineering feasibility. Furthermore, both the local resonance assembly 2 and the multi-layer sound absorption assembly 4 are standardized modules. This modular design reduces material usage and processing costs, facilitating installation and maintenance, while maintaining a simple structure and fabrication. Compared to conventional noise reduction materials that cover the entire pipe 1, this design requires less material, reduces maintenance costs, and offers improved economics.

[0056] During installation, each local resonance assembly 2 is first evenly arranged on the outer wall of pipe 1, ensuring consistent spacing between them. Then, the local resonance assembly 2 is tightly connected to pipe 1 via support structure 3. Finally, the multi-layer sound absorption assembly 4 is installed at the pipe opening, ensuring that the porous sound absorption layer 42 is close to the pipe opening. It is then bolted to the outer wall of the pipe opening to further absorb residual sound wave energy at the end of pipe 1.

[0057] Example 2

[0058] Reference Figure 1-Figure 5 As shown, this embodiment provides a ship seawater pipeline system, comprising a pipeline 1 and the pipeline noise reduction device of Example 1. The pipeline noise reduction device is disposed on the pipeline 1. By introducing the pipeline noise reduction device onto the pipeline 1, and the pipeline noise reduction device includes a local resonance component 2, a periodic local resonance structure is formed on the pipeline 1. This effectively utilizes the resonance effect of the acoustic metamaterial in a specific low-frequency band, thereby forming a wide-band vibration band gap on the pipeline 1, preventing low-frequency vibration from propagating along the pipeline 1. The entire structure is compact and easy to install, and can be quickly installed and replaced directly through the support structure 3. Only a few local resonance components 2 need to be disposed along the length of the pipeline 1, without covering the entire pipeline, occupying a small space. Without significantly increasing the volume and weight of the pipeline system, the low-frequency vibration of the pipeline 1 can be effectively reduced, thereby improving the vibration and noise reduction effects of the pipeline system. This effectively solves the problem of poor low-frequency control performance of traditional noise reduction devices, while also meeting the noise control requirements of ship seawater pipeline systems under various complex operating conditions.

[0059] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0060] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A pipeline noise reduction device, characterized in that: include: A local resonance component (2) is provided with a plurality of resonance units with frequency gradient distribution and is arranged along the length direction of the pipeline (1), and is used to generate a resonance effect in a low frequency band to form a vibration band gap in a wide frequency band; a supporting structure (3) disposed at the local resonance component (2) and used for connecting the local resonance component (2) to the pipeline (1); The multi-layer sound absorbing component (4) is arranged at the pipe mouth of the pipe (1) and is used for attenuating and absorbing sound wave energy.

2. The pipeline noise reduction device according to claim 1, characterized in that: The local resonance component (2) comprises: A sound-absorbing shell (21) is used to absorb the sound wave energy of the pipeline and is provided with a plurality of accommodating cavities therein; A mass block (22) is arranged in the accommodating cavity and is used to provide the inertial mass of the resonance unit; An elastic support body (23) is arranged in the accommodating cavity and is used to provide elastic restoring force for the resonance unit.

3. The pipeline noise reduction device according to claim 2, characterized in that: The sound-absorbing shell (21) is arranged in an annular shape and is sleeved on the pipe (1). The mass block (22) and the elastic support body (23) are arranged along the annular direction of the sound-absorbing shell (21), and the frequency of the resonance unit formed by the mass block (22) and the elastic support body (23) is distributed in a gradient.

4. The pipeline noise reduction device according to claim 2, characterized in that: A gap is left between the sound-absorbing shell (21) and the pipe (1).

5. The pipeline noise reduction device according to claim 1, characterized in that: The supporting structure (3) comprises a connecting member (31) arranged between the local resonance component (2) and the pipeline (1), wherein at least two connecting members (31) are provided, and the connecting members (31) are detachably connected to the local resonance component (2) and the pipeline (1), respectively.

6. The pipeline noise reduction device according to claim 5, characterized in that: The connecting member (31) comprises a first end (311) and a second end (312), wherein the first end (311) and the second end (312) correspond to the pipeline (1) and the local resonance component (2), respectively; At least one screw hole (313) is provided on each of the first end (311) and the second end (312), and a bolt member (314) is provided on each of the first end (311) and the second end (312). The bolt members (314) are threaded into the screw holes (313) in sequence, and the bolt member (314) on the first end (311) and the bolt member (314) on the second end (312) are threaded into the pipe (1) and the local resonance component (2) in sequence, thereby connecting the local resonance component (2) to the pipe (1).

7. The pipeline noise reduction device according to claim 1, characterized in that: The multi-layer sound absorbing assembly (4) comprises a honeycomb structure layer (41), a porous sound absorbing layer (42) and / or a micro-perforated plate layer (43), wherein: The porous sound absorbing layer (42) and the micro-perforated plate layer (43) are respectively arranged on both sides of the honeycomb structure layer (41); the honeycomb structure layer (41) supports the porous sound absorbing layer (42) and the micro-perforated plate layer (43) and disperses energy; the porous sound absorbing layer (42) is used to absorb low-frequency sound wave energy, and the micro-perforated plate layer (43) is used to absorb medium and high-frequency vibrations.

8. The pipeline noise reduction device according to claim 7, characterized in that: The porous sound absorbing layer (42) is arranged on the side of the honeycomb structure layer (41) facing the pipe opening of the pipe (1), and the micro-perforated plate layer (43) is arranged on the side of the honeycomb structure layer (41) facing away from the pipe opening of the pipe (1).

9. The pipeline noise reduction device according to claim 2, characterized in that: The mass block (22) is made of a high-density metal material, the elastic support body (23) is made of a high-elasticity rubber or polyurethane material, and the sound-absorbing shell (21) is composed of a rigid perforated outer wall and an inner flexible porous sound-absorbing material.

10. A ship seawater piping system, characterized in that: The invention comprises a pipeline (1) and a pipeline noise reduction device according to any one of claims 1 to 9, wherein the pipeline noise reduction device is arranged on the pipeline (1).

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