Noise reduction booth

Abstract

The application discloses a noise reduction shed, and relates to the technical field of mine environmental protection noise control. The noise reduction shed comprises a frame structure, which is provided with an inner side surface and an outer side surface; a sound insulation enclosure structure, which comprises a plurality of composite boards, and the plurality of composite boards are connected to the outer side surface of the frame structure, each composite board comprises, in sequence along the direction from the outer side surface to the inner side surface, a protective layer, a sound absorbing layer and a sound guide layer; wherein the sound guide layer is provided with a plurality of sound guide holes, the plurality of sound guide holes penetrate through the sound guide layer along the direction from the outer side surface to the inner side surface, and a flow guide vane is arranged in the sound guide hole, and the flow guide vane is inclined from the side of the sound guide layer away from the sound absorbing layer to the side close to the sound absorbing layer. The noise reduction shed is provided with the function division of the multi-layer composite board and the directional sound guiding of the flow guide vane, so that the high-strength noise generated by the motor and the fan in the crushing, screening and dust removal links of the iron ore is greatly reduced, the professional health of the surrounding post operators is protected, and the comfort of the working environment is improved.

Description

Technical Field

[0001] This application relates to the field of noise control technology in mining environmental protection, and in particular to a noise reduction shed. Background Technology

[0002] In iron ore crushing, screening, and dust removal processes, motors and fans, as the core driving equipment of the dust removal system, generate high-intensity noise during continuous operation. Their sound pressure levels generally exceed 100 dB(A), significantly higher than the workplace noise limits stipulated in the "Design Code for Noise Control of Industrial Enterprises" (GB / T50087-2013). This poses a serious threat to the occupational health of operators in surrounding areas and significantly reduces the comfort of the working environment, necessitating effective noise control measures. However, traditional noise control methods, such as simply using sound-absorbing materials or installing silencers, have significant limitations in noise reduction effectiveness.

[0003] Therefore, how to provide a noise reduction tent with excellent noise reduction effect is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a noise reduction shed, comprising: a frame structure having an inner surface and an outer surface; and a soundproof enclosure structure comprising multiple composite panels connected to the outer surface of the frame structure. Each composite panel includes a protective layer, a sound-absorbing layer, and a sound-guiding layer in sequence along the direction from the outer surface to the inner surface. The sound-guiding layer has multiple sound-guiding holes that penetrate the sound-guiding layer along the direction from the outer surface to the inner surface. Each sound-guiding hole has a guide plate that is inclined from the side of the sound-guiding layer away from the sound-absorbing layer to the side closer to the sound-absorbing layer.

[0005] In some embodiments, the protective layer is a galvanized steel sheet, and the side of the protective layer facing the sound-absorbing layer has spaced arc-shaped protrusions.

[0006] In some embodiments, the sound-absorbing layer is a sound-absorbing glass wool layer with a thickness ranging from 50mm to 100mm.

[0007] In some embodiments, the noise reduction shed further includes a seal that abuts between two adjacent composite panels to cover the outer surface together with the soundproof enclosure structure.

[0008] In some embodiments, multiple composite panels are detachably connected to the frame structure.

[0009] In some embodiments, the sound-absorbing layer has multiple independent enclosed cavities inside, and the enclosed cavities are filled with inert gas.

[0010] In some embodiments, the noise reduction shed further includes: an adhesive layer, wherein the protective layer and the sound-absorbing layer, and the sound-absorbing layer and the sound-guiding layer are connected by the adhesive layer; and support columns, wherein multiple support columns are provided between the sound-guiding layer and the sound-absorbing layer, and the multiple support columns are arranged at intervals.

[0011] In some embodiments, the noise reduction shed further includes: an air vent disposed on the composite panel and corresponding to a reserved opening in the frame structure; and multiple sound-absorbing plates, which are elastic and distributed throughout the ventilation cross-section of the air vent to cover the air vent.

[0012] In some embodiments, the opposite sidewalls of the air vent are respectively provided with a plurality of first silencing plates and a plurality of second silencing plates, the first silencing plates and the second silencing plates are arranged alternately, and along the axial direction of the air vent, the orthographic projection of the first silencing plate onto the second silencing plate at least partially overlaps with the second silencing plate.

[0013] In some embodiments, the seal is elastic, has a sealed inflation chamber, and is provided with a one-way inflation valve; sealing grooves are provided at the splicing edges of two adjacent composite panels, and the seal is embedded in the sealing grooves.

[0014] Compared to existing technologies, this noise reduction shed uses a frame structure as its foundation and constructs a targeted noise blocking system through multiple composite panels in the soundproof enclosure. Protective layers, sound-absorbing layers, and sound-guiding layers are sequentially arranged along the outer and inner surfaces of the composite panels, forming a multi-layered acoustic treatment structure that synergistically combines protection, sound absorption, and sound guidance. Multiple through-holes in the sound-guiding layer provide directional transmission channels for noise within the shed. Combined with guide vanes within these vanes, which slope from the side of the sound-guiding layer away from the sound-absorbing layer towards the sound-absorbing layer, noise is actively guided towards the sound-absorbing layer, preventing secondary noise from being reflected and superimposed within the shed, and significantly improving the efficiency of noise entering the sound-absorbing layer. The overall structure, through the functional division of the multi-layered composite panels and the directional sound-guiding design of the guide vanes, significantly reduces the high-intensity noise generated by motors and fans in the iron ore crushing, screening, and dust removal processes, protecting the occupational health of operators in surrounding areas and improving the comfort of the working environment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a noise reduction shed provided in an embodiment of this application; Figure 2 A schematic diagram of the frame structure of another noise reduction shed provided in an embodiment of this application; Figure 3 A partial schematic diagram of a composite panel for a noise-reducing shed provided in an embodiment of this application; Figure 4 A top view of the air vent of a noise reduction shed provided in an embodiment of this application; Figure 5 A side view of the air vent of another noise reduction shed provided in an embodiment of this application.

[0016] Figure label: 1. Noise Reduction Shed; 2. Frame Structure; 21. Inner Surface; 22. Outer Surface; 23. Ventilation Opening; 3. Composite Board; 31. Protective Layer; 311. Arc-shaped Protrusion; 32. Sound Absorption Layer; 321. Enclosed Cavity; 33. Sound Guiding Layer; 331. Sound Guiding Hole; 332. Air Guide Plate; 4. Air Outlet; 5. Sound Absorption Plate; 6. Sealing Components. Detailed Implementation

[0017] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0018] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0019] In the industrial production processes of iron ore crushing, screening, and dust removal, motors and fans, as the core power equipment of the dust removal system, operate under high loads for extended periods, inevitably generating high-intensity aerodynamic and mechanical vibration noise. Their combined sound pressure level generally exceeds 100 dB(A), far exceeding the 85 dB(A) workplace noise exposure limit specified in the "Design Code for Noise Control of Industrial Enterprises" (GB / T50087-2013), and in some areas even approaching or reaching dangerous noise levels. This continuous high-decibel noise not only seriously threatens the hearing health of operators in surrounding positions, potentially leading to permanent hearing loss, tinnitus, and other occupational diseases, but also causes physiological and psychological problems such as anxiety, fatigue, and decreased concentration, thereby affecting production safety and operational efficiency. Simultaneously, the harsh acoustic environment significantly reduces the overall comfort and humanization of the workspace, hindering the progress of green and intelligent development in enterprises.

[0020] like Figures 1-5 As shown in the embodiment of this application, a noise reduction shed 1 is provided. The noise reduction shed 1 includes a frame structure 2 and a sound insulation enclosure structure. The frame structure 2 has an inner surface 21 and an outer surface 22. The sound insulation enclosure structure includes multiple composite panels 3, and the multiple composite panels 3 are connected to the outer surface 22 of the frame structure 2. Each composite panel 3 includes a protective layer 31, a sound-absorbing layer 32 and a sound-guiding layer 33 in sequence along the direction from the outer surface 22 to the inner surface 21. The sound-guiding layer 33 has multiple sound-guiding holes 331, and the multiple sound-guiding holes 331 penetrate the sound-guiding layer 33 along the direction from the outer surface 22 to the inner surface 21. The sound-guiding holes 331 are provided with guide plates 332, and the guide plates 332 are inclined from the side of the sound-guiding layer 33 away from the sound-absorbing layer 32 to the side closer to the sound-absorbing layer 32.

[0021] In one possible scenario, the noise reduction shed 1 may include a frame structure 2 and a soundproof enclosure structure. For example... Figure 1 , Figure 2 As shown, the frame structure 2 can be constructed from structural steel or galvanized square tubing through bolt connections or on-site welding to form a stable three-dimensional skeleton. It can be a hexahedral box structure with an inner surface 21 and an outer surface 22. The inner surface 21 faces the fan motor, and the outer surface 22 faces the external environment. This skeleton not only provides mechanical support for the entire noise reduction shed 1 but also serves as the mounting base for the sound insulation enclosure structure.

[0022] The soundproof enclosure structure may include multiple rectangular or irregularly shaped composite panels 3. The multiple composite panels 3 can be detachably connected by screws, tenon joints, or snap-fit ​​structures. The multiple composite panels 3 can also be detachably connected to the outer surface 22 of the frame structure 2 by screws or snap-fit ​​structures to form a closed acoustic space. Each composite panel 3, from the outside to the inside, that is, from the outer surface 22 of the frame structure 2 to the inner surface 21, includes three functional layers in sequence: a protective layer 31, a sound-absorbing layer 32, and a sound-guiding layer 33.

[0023] The outermost protective layer 31 can be made of 1.2mm thick galvanized steel plate, possessing excellent mechanical strength, corrosion resistance, and rain and dust resistance, ensuring the long-term stable operation of the noise reduction shed 1 in the harsh environment of the mine. The middle sound-absorbing layer 32 can be 80mm thick, filled with high-density, fire-resistant Class A sound-absorbing glass wool, and treated with water-repellent properties to enhance moisture and corrosion resistance. Its thickness can be 50mm-100mm, such as 50mm, 75mm, or 100mm. The sound-absorbing layer 32 is the core of sound energy absorption, converting sound wave energy into heat energy through the viscous friction within the porous material, achieving efficient attenuation of mid-to-high frequency noise.

[0024] The innermost layer is the sound-guiding layer 33, which directly faces the high noise source. The sound-guiding layer 33 can be made of perforated aluminum plate or micro-perforated plate, with multiple sound-guiding holes 331 with a diameter of 5mm-10mm. These sound-guiding holes 331 extend along the thickness direction of the composite plate 3, from the outer surface 22 to the inner surface 21, through the entire sound-guiding layer 33. Each sound-guiding hole 331 can be embedded with a guide plate 332, which can be made of aluminum alloy sheet and is inclined at a 45° angle from the outer end face to the inner end face of the sound-guiding layer 33. When fan noise enters the sound-guiding hole 331, the inclined guide plate 332 forces the sound wave to undergo multiple reflections, refractions, and scatterings, disrupting the sound wave propagation path, extending the propagation distance of the sound wave in the sound-absorbing layer 32, enhancing the noise attenuation capability, and suppressing direct sound wave transmission, thereby improving the overall sound insulation performance.

[0025] Compared to existing technologies, this noise reduction shed 1 is based on a frame structure 2 and uses multiple composite panels 3 of a soundproof enclosure to construct a targeted noise blocking system. The composite panels 3 are arranged sequentially along the outer surface 22 to the inner surface 21 of the frame structure 2, forming a multi-layered acoustic treatment structure that synergistically combines protection, sound absorption, and sound guidance. Multiple through-holes 331 in the sound guiding layer 33 provide directional transmission channels for noise within the shed. Combined with guide vanes 332 within these holes, which slope from the side of the sound guiding layer 33 away from the sound-absorbing layer 32 towards the side closer to the sound-absorbing layer 32, noise can be actively guided towards the sound-absorbing layer 32, preventing secondary noise from being reflected and superimposed within the shed, and significantly improving the efficiency of noise entering the sound-absorbing layer 32. The overall structure, through the functional division of the multi-layer composite plate 3 and the directional sound guidance setting of the guide plate 332, significantly reduces the high-intensity noise generated by motors and fans in the iron ore crushing, screening and dust removal process, which not only protects the occupational health of operators in the surrounding positions, but also improves the comfort of the working environment.

[0026] like Figure 3 As shown, in some embodiments, the protective layer 31 is a galvanized steel sheet, and the side of the protective layer 31 facing the sound-absorbing layer 32 is provided with spaced arc-shaped protrusions 311.

[0027] In one possible scenario, the protective layer 31 facing the sound-absorbing layer 32 may have spaced-apart arc-shaped protrusions 311. These arc-shaped protrusions 311 may be integrally formed with the protective layer 31, creating a periodic or non-periodic wave-like structure on the protective layer 31. The spacing between adjacent arc-shaped protrusions 311 can be set according to actual needs, such as 20mm, 25mm, 30mm, etc. Multiple arc-shaped protrusions 311 may be arranged in an alternating pattern, and the cross-section of the arc-shaped protrusions 311 may be circular or elliptical. The arc-shaped surface has good sound wave scattering ability. The incident sound wave undergoes multiple irregular reflections, refractions, and diffractions between multiple arc-shaped protrusions 311, prolonging the propagation path and residence time of the sound wave in the internal cavity of the composite plate 3 or the sound-absorbing layer 32, increasing the contact opportunities between sound energy and sound-absorbing materials, improving frictional dissipation efficiency, and blocking noise.

[0028] like Figure 1 As shown, in some embodiments, the noise reduction shed 1 also includes a sealing element 6, which abuts between two adjacent composite panels 3 to cover the outer surface 22 together with the sound insulation enclosure structure.

[0029] In one possible scenario, sealing elements 6 may be provided between the composite panel 3 and the frame structure 2, and at the joints of adjacent composite panels 3. The sealing element 6 may be a highly elastic sealing strip, and its material may include, but is not limited to, EPDM rubber, silicone rubber, or neoprene rubber. The cross-section of the sealing element 6 may be D-shaped or P-shaped to increase the overall airtightness of the shed and prevent sound leakage.

[0030] In some embodiments, the seal 6 is elastic, has a sealed inflation chamber, and is provided with a one-way inflation valve; sealing grooves are provided at the splicing edges of two adjacent composite panels 3, and the seal 6 is embedded in the sealing grooves.

[0031] In one possible scenario, the seal 6 may have a sealed inflation chamber equipped with a one-way inflation valve. After the noise reduction chamber 1 is assembled, air or inert gas can be injected into the seal 6 via an external air source through the one-way inflation valve. This causes the inflation chamber to expand, pushing the outer wall of the seal 6 to fit more tightly against the contact surfaces of the two composite plates 3, achieving a dynamic and controllable pre-tightening sealing effect. This compensates for loosening between the composite plates 3 due to processing deviations, temperature deformation, or long-term use, maintaining long-term stable sealing performance.

[0032] Each of the splicing edges of two adjacent composite panels 3 is provided with a sealing groove that matches the sealing element 6. The sealing groove can be U-shaped, dovetail-shaped, or rectangular, and is continuously arranged along the length of the panel edge. The sealing element 6 is completely embedded in the sealing groove. During installation, the sealing element 6 is first placed into the sealing groove of one side of the composite panel 3. After the other side of the composite panel 3 is joined, the sealing element 6 is compressed and undergoes elastic or inflatable expansion deformation, completely filling the splicing gap. By setting the sealing element 6 with an elastic or inflatable structure, and in conjunction with the dedicated sealing groove, the overall airtightness and sound insulation integrity are enhanced, further ensuring a quiet and safe working environment.

[0033] The inner wall of the sealing groove can be provided with several spaced protrusions. When the inflatable high-elasticity sealing strip is inflated, the outer wall of the sealing strip and the protrusions are squeezed against each other to form a multi-point sealing contact, which further enhances the sealing effect of the gap and prevents noise from leaking from the contact gap between the groove wall and the sealing strip.

[0034] In addition, the bottom of the noise reduction shed 1 can be equipped with a basic vibration reduction and isolation system: the fan and motor are installed on a special vibration reduction base, and rubber vibration reduction pads are laid between the base and the concrete foundation to block the transmission of equipment vibration through the structure and reduce noise radiation from the source.

[0035] In some embodiments, multiple composite panels 3 are detachably connected to the frame structure 2.

[0036] In one possible scenario, the connection between the composite panel 3 and the frame structure 2 can be made detachable using various methods, such as screws, bolts, clips, or clamps. For example, bolts can be inserted into pre-drilled holes on the edges of the frame structure 2 and the composite panel 3, and secured with corresponding nuts; or multiple composite panels 3 can be detachably connected to the frame structure 2 via a mortise and tenon structure. The mortise and tenon structure includes tenons on the edges of the composite panel 3 and mortises at corresponding positions on the frame structure 2, or conversely, the frame provides the tenons and the composite panels 3 provide the mortises. When the composite panel 3 is installed, its tenons are precisely inserted into the mortises on the frame along a vertical or sliding direction, relying on structural interlocking to achieve positioning and fixation. This modular and detachable design not only simplifies the construction process and reduces on-site operational difficulty, but also allows for flexible adjustment of the size or shape of the noise reduction shed 1 according to actual needs, adapting to noise control requirements under different working conditions. It also provides convenient conditions for future upgrades and renovations.

[0037] like Figure 3 As shown, in some embodiments, the sound-absorbing layer 32 has multiple independent closed cavities 321 inside, and the closed cavities 321 are filled with inert gas.

[0038] In one possible scenario, the interior of the sound-absorbing layer 32 may also contain multiple independent enclosed cavities 321. These cavities 321 are completely sealed within the sound-absorbing layer 32 material or formed by flexible sound-insulating membranes (such as aluminum foil composite films or PVC sound insulation boards), and are arranged in an array, honeycomb pattern, or randomly distributed throughout the sound-absorbing layer 32. The shape of the enclosed cavities 321 can be spherical, ellipsoidal, cubic, hexagonal honeycomb, or polyhedral. Hexagonal honeycomb or regularly arrayed spherical cavities can be used to improve structural stability and space utilization. The enclosed cavities 321 can be constructed by embedding molds during the prefabrication of the sound-absorbing material, or by forming an airtight separation layer through hot pressing and bonding during the lamination of the panels. Each enclosed cavity 321 can be filled with an inert gas, such as nitrogen or sulfur hexafluoride. In addition, the enclosed cavity 321 near the sound-guiding layer 33 is smaller and has a higher density, used to absorb mid-to-high frequency noise, while the enclosed cavity 321 near the protective layer 31 is larger and tuned to low-frequency resonance to achieve broadband sound absorption. By setting an independent enclosed cavity 321 filled with inert gas inside the sound-absorbing layer 32, this embodiment constructs a composite noise reduction structure integrating porous sound absorption, air chamber resonance, and high impedance sound insulation, improving the sound absorption efficiency of the sound-absorbing material and further enhancing the noise reduction effect of the noise reduction shed 1 in complex industrial noise environments.

[0039] In some embodiments, the noise reduction shed 1 further includes an adhesive layer and support columns. The protective layer 31 and the sound-absorbing layer 32, and the sound-absorbing layer 32 and the sound-guiding layer 33 are connected by the adhesive layer. Multiple support columns are provided between the sound-guiding layer 33 and the sound-absorbing layer 32, and the multiple support columns are arranged at intervals.

[0040] In one possible scenario, the adhesive layer can be placed between adjacent functional layers, specifically between the protective layer 31 and the sound-absorbing layer 32, and between the sound-absorbing layer 32 and the sound-conducting layer 33, for bonding and fixation. The adhesive layer can be a high-strength, temperature-resistant, aging-resistant, and environmentally friendly structural adhesive, such as polyurethane, acrylic, or modified silicone. A continuous bonding interface is formed through uniform coating or spraying, ensuring a firm bond between the protective layer 31, the sound-absorbing layer 32, and the sound-conducting layer 33. This prevents problems such as interlayer delamination and bulging caused by vibration or temperature differences, and effectively blocks sound bridges, preventing direct sound energy transmission through rigid contact, thereby improving overall sound insulation performance. Simultaneously, the adhesive layer possesses a certain degree of elastic deformation capacity, which can buffer minor vibrations during equipment operation, further suppressing structural sound transmission.

[0041] In addition, to prevent deformation of the composite panel 3 during installation, transportation, or long-term pressure, which could compress the internal sound-absorbing material and affect its porosity and sound absorption efficiency, this embodiment provides multiple support columns between the sound-guiding layer 33 and the sound-absorbing layer 32. These support columns can be made of high-strength, lightweight non-metallic materials, such as nylon, PVC, or polycarbonate, or can be made of metallic materials such as aluminum alloy and insulated to avoid sound bridge formation. The support columns can be cylindrical, square, or conical. The end faces of the support columns that contact the sound-guiding layer 33 and the sound-absorbing layer 32 can be flat or have a structure with elastic gaskets to increase the contact area and reduce pressure. Multiple support columns can be arranged in an array or honeycomb pattern on the inner surface of the sound-guiding layer 33. The distribution density is determined according to the size of the composite panel 3 and the pressure requirements, such as 8-16 columns per square meter, to ensure that the composite panel is evenly stressed.

[0042] The physical support of the support columns between the sound-absorbing layer 32 and the sound-guiding layer 33 maintains a constant air gap or structural space between them, preventing external forces from directly compressing the porous sound-absorbing material in the sound-absorbing layer 32. This effectively prevents problems such as material compression deformation, decreased resilience, and pore blockage. Furthermore, this air gap can work in conjunction with the sound-guiding holes 331 and the guide vanes 332 to form a localized back cavity resonance structure, further enhancing the absorption capacity for noise in specific frequency bands (such as low-frequency eddy current noise from fans).

[0043] like Figure 1 , Figure 4 As shown, in some embodiments, the noise reduction shed 1 also includes an air vent 4 and multiple sound-absorbing plates 5. The air vent 4 is disposed on the composite panel 3 and corresponds to the reserved opening of the frame structure 2. The multiple sound-absorbing plates 5 are elastic and are distributed throughout the ventilation section of the air vent 4 to cover the air vent 4.

[0044] In one possible scenario, the composite panel 3 is equipped with air vents 4, and there can be multiple air vents 4. The positions of the air vents 4 are aligned and connected with the pre-set ventilation openings 23 on the frame structure 2, forming a channel for equipment air intake or exhaust. The air vents 4 can be located on the top, side wall, etc. of the noise reduction shed 1. The size and position of the air vents 4 are optimized according to the heat dissipation requirements of the fan or motor, the airflow direction, and the site layout. Multiple sound-absorbing plates 5 can be installed inside the air vents 4. The sound-absorbing plates 5 are elastic and distributed throughout the ventilation cross-section of the air vent 4, that is, uniformly covering the entire ventilation flow area, forming a dense acoustic barrier array. When airflow passes through, noise waves pass through the narrow channel formed by multiple sound-absorbing plates 5, while the airflow can flow smoothly along the gaps between the plates.

[0045] The sound-absorbing plate 5 can be made of a composite material that combines sound absorption performance and structural elasticity. For example, the surface can be a perforated aluminum plate, the interior can be filled with a thin layer of centrifugal glass wool or polyester fiber sound-absorbing material, and the matrix can be a PVC board or rubber-metal composite plate 3 with a certain degree of flexibility. When noise propagates from the equipment side to the outside, the noise sound waves can only radiate outward by passing through these narrow gaps. In this process, multiple reflections, interferences, and scattering occur, which prolongs the propagation path of the sound waves. The airflow pulsation or sound pressure fluctuation during the operation of the fan will cause the sound-absorbing plate 5 to vibrate slightly. This vibration helps to prevent dust and particulate matter from accumulating on the surface of the plate or in the narrow gaps.

[0046] like Figure 5 As shown, in some embodiments, the opposite sidewalls of the air vent 4 are respectively provided with a plurality of first sound-absorbing plates 5 and a plurality of second sound-absorbing plates 5. The first sound-absorbing plates 5 and the second sound-absorbing plates 5 are arranged alternately, and along the axial direction of the air vent 4, the orthographic projection of the first sound-absorbing plate 5 onto the second sound-absorbing plate 5 at least partially overlaps with the second sound-absorbing plate 5.

[0047] In one possible scenario, the first silencer 5 is installed on the inner wall or side plate of one side of the air vent 4, while the second silencer 5 is installed on the opposite side wall, forming a counter-arrangement. The first and second silencer 5 are located in different radial planes on the cross-section of the air vent 4. Along the axial direction of the air vent 4, i.e., along the airflow direction, the orthogonal projection of the first silencer 5 onto the plane containing the second silencer 5 partially or completely covers it. That is, from the noise source side to the external environment, sound waves cannot pass through the first and second silencer 5 in a straight line; the first and second silencer 5 form a Z-shaped sound propagation path at the air vent 4. The staggered arrangement of the first and second silencer 5 allows the airflow to form uniform disturbances within the channel rather than concentrated impacts, helping to smooth the flow field, reduce local eddies and turbulence intensity, thereby suppressing regenerated noise caused by airflow separation and further improving the noise reduction effect of the noise reduction shed 1.

[0048] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0049] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0050] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0051] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A noise-reducing shed, characterized in that, include: A frame structure having an inner surface and an outer surface; A soundproof enclosure structure includes multiple composite panels, and the multiple composite panels are connected to the outer surface of the frame structure. Each composite panel includes a protective layer, a sound-absorbing layer and a sound-conducting layer in sequence along the direction from the outer surface to the inner surface. The sound guiding layer is provided with a plurality of sound guiding holes, which penetrate the sound guiding layer along the direction from the outer surface to the inner surface. A guide plate is provided in the sound guiding hole, and the guide plate is inclined from the side of the sound guiding layer away from the sound-absorbing layer to the side closer to the sound-absorbing layer.

2. The noise reduction shed according to claim 1, characterized in that, The protective layer is made of galvanized steel sheet, and the side of the protective layer facing the sound-absorbing layer has spaced arc-shaped protrusions.

3. The noise reduction shed according to claim 1, characterized in that, The sound-absorbing layer is a sound-absorbing glass wool layer with a thickness ranging from 50mm to 100mm.

4. The noise reduction shed according to claim 1, characterized in that, The noise reduction shed also includes: A sealing element is abutted between two adjacent composite panels to cover the outer surface together with the soundproof enclosure structure.

5. The noise reduction shed according to claim 1, characterized in that, Multiple composite panels are detachably connected to the frame structure.

6. The noise reduction shed according to claim 1, characterized in that, The sound-absorbing layer has multiple independent closed cavities inside, and the closed cavities are filled with inert gas.

7. The noise reduction shed according to claim 1, characterized in that, The noise reduction shed also includes: An adhesive layer is used to connect the protective layer to the sound-absorbing layer and the sound-conducting layer. Support columns are provided between the sound guiding layer and the sound absorbing layer, and the support columns are arranged at intervals.

8. The noise reduction shed according to claim 1, characterized in that, The noise reduction shed also includes: Air vents are installed on the composite panel and correspond to the reserved openings in the frame structure; Multiple sound-absorbing plates are provided, the multiple sound-absorbing plates are elastic, and the multiple sound-absorbing plates are distributed throughout the ventilation cross-section of the air outlet to cover the air outlet.

9. The noise reduction shed according to claim 8, characterized in that, The opposite sidewalls of the air vent are respectively provided with a plurality of first silencing plates and a plurality of second silencing plates. The first silencing plates and the second silencing plates are arranged alternately, and along the axial direction of the air vent, the orthographic projection of the first silencing plate onto the second silencing plate at least partially overlaps with the second silencing plate.

10. The noise reduction shed according to claim 4, characterized in that, The seal is elastic, has a sealed inflation chamber, and is equipped with a one-way inflation valve. A sealing groove is provided at the splicing edge of two adjacent composite panels, and the sealing element is embedded in the sealing groove.

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