Fan noise reduction room

Abstract

The fan noise reduction room comprises a shell, the inner wall of the shell is connected with a porous sound absorption plate, an inner supporting frame is connected into the shell, the shell is connected with a child-mother sound insulation door in an embedded mode, the shell is connected with a small air inlet and a large air inlet, and a shell body of the shell comprises an outer layer sound insulation plate and an inner layer sound insulation plate connected with the outer layer sound insulation plate. The space between the outer-layer sound insulation board and the inner-layer sound insulation board is filled with sound absorption filler, the small air inlet and the large air inlet are the same in structure, the large air inlet comprises an air inlet channel, and a plurality of sets of V-shaped sound absorption pieces distributed in an arrayed mode are connected into the air inlet channel. The beneficial effects are that the noise reduction performance is obviously improved, the ventilation heat dissipation performance and the noise reduction performance are relatively balanced, the structure is simplified, and the economical efficiency is optimized.

Description

Technical Field

[0001] The invention relates to the technical field of noise control, and in particular to a fan silencing room. Background Art

[0002] As the core equipment in industrial production and building ventilation systems, fans are widely used. In thermal power plants, fans are responsible for the gas transportation tasks in key links such as boiler air supply, induced draft and flue gas desulfurization; in the central air-conditioning system of large commercial buildings, centrifugal fans provide ventilation for the entire building; and in the metallurgical industry, fans are used in blast furnace blowing, workshop dust removal and other processes. However, the high-intensity noise generated by fans during operation has become an environmental and health hazard that cannot be ignored. Actual measured data show that the peak operating noise of some high-power industrial fans can even reach 130dB, far exceeding the national occupational exposure limit of 85dB for industrial sites.

[0003] At present, among the mainstream noise reduction technologies, soundproof covers are mostly used for local noise reduction of small fans, while silencers are often connected in series in the pipeline system to deal with airflow noise. Fan silencer rooms have become the preferred solution for noise reduction of medium and large fans due to their fully enclosed noise reduction characteristics. Taking the stamping workshop of a certain automobile manufacturing company as an example, the total noise value of its 20 axial flow fans reached 118dB. After the traditional metal plate soundproof room was used in the early stage, the workshop noise was reduced to 95dB, but it still did not meet the standard, and the fans frequently stopped due to poor heat dissipation.

[0004] Traditional metal plate soundproof rooms use steel or aluminum plates as the main frame, and are filled with sound-absorbing materials such as rock wool and glass wool. This type of structure has obvious defects in the application of a mine ventilation system: due to the acoustic bridge effect of the metal shell, the 30Hz fundamental frequency noise of the fan is only attenuated by 8dB; the simple shutter design of the air inlet and outlet makes the ventilation resistance coefficient as high as 0.8, resulting in a 12% increase in fan energy consumption; and in the humid environment of the mine, the annual average agglomeration replacement rate of the sound-absorbing material is 35%, and the maintenance cost accounts for more than 20% of the total equipment investment.

[0005] Although the modular anechoic room uses double-layer prefabricated panels and a labyrinth-style channel design, when used in a clean air conditioning system in an electronics factory, it can attenuate noise above 1kHz by 40dB, but attenuate the fan's 150Hz low-frequency noise by less than 15dB. Its complex modular assembly results in an installation period of up to 28 days, which increases the cost by 35% compared to traditional structures. In addition, the labyrinth channel increases the volume of the anechoic room by 40%, seriously squeezing the limited space of the factory.

[0006] The composite soundproofing room combines a rubber damping layer with a polyester fiber sound-absorbing layer. In a noise reduction project for centrifugal fans in a chemical park, it achieved an overall noise reduction of 38dB. However, the multi-layer composite structure caused the processing cost to soar, and the material cost of a single soundproofing room exceeded 250,000 yuan. The impedance composite silencer caused the fan wind pressure loss to reach 150Pa, resulting in an 18% increase in system energy consumption. The disassembly of the multi-layer structure required professional tools, and the time required for a single maintenance was 2.3 times longer than that of the traditional structure.

[0007] The root cause of the technical bottleneck lies in the limitations of materials and structural design. The low-frequency sound absorption coefficient of traditional sound-absorbing materials is generally lower than 0.2 (for example, the sound absorption coefficient of rock wool is only 0.12 at 50Hz), which cannot meet the strict requirements for low-frequency noise in the "Environmental Noise Emission Standards for Industrial Enterprises" (GB12348-2008). The existing soundproofing room structures are mostly universal designs, which are not optimized for the spectral characteristics of fan noise. For example, the targeted attenuation of the harmonics of the fan blade pass frequency (BPF) is not considered. At the same time, the independent design of the sound insulation, sound absorption and ventilation functional modules makes it difficult to coordinate the system performance. For example, high-efficiency sound insulation structures are often accompanied by high airflow resistance. The present invention aims to break through the above-mentioned technical barriers and achieve a balance between noise reduction performance, ventilation efficiency and economic cost. Summary of the invention

[0008] In order to solve the above problems, especially to address the deficiencies in the prior art, the present invention provides a fan soundproofing room that can solve the above problems.

[0009] To achieve the above purpose, the present invention adopts the following technical means:

[0010] A fan soundproofing room, comprising a shell, the inner wall of the shell is connected to a porous sound absorbing board, the shell is connected to a plurality of evenly distributed internal support frames, the front side of the shell is inlaid with a mother-and-child soundproof door, the front side of the shell is connected to a plurality of small air inlets, and the rear side of the shell is connected to a large air inlet;

[0011] The shell of the outer shell is a double-layer structure, and the shell of the outer shell includes an outer sound insulation board and an inner sound insulation board connected to the outer sound insulation board, and sound-absorbing filler is filled between the outer sound insulation board and the inner sound insulation board;

[0012] The small air inlet has the same structure as the large air inlet. The large air inlet includes an air inlet channel connected to the shell. A plurality of groups of V-shaped sound absorbing sheets arranged and distributed are connected in the air inlet channel. The included angle of the V-shaped sound absorbing sheets is an obtuse angle.

[0013] A further solution of the present invention is that the outer sound insulation board is a rock wool sandwich panel.

[0014] A further solution of the present invention is that the sound absorbing filler is glass fiber wool.

[0015] A further solution of the present invention is that the inner sound insulation board is a damping sound insulation board.

[0016] A further solution of the present invention is that the bottoms of the housing and the large air inlet are both connected to brackets.

[0017] A further solution of the present invention is that the porous sound absorbing board is a high-density polyester fiber porous sound absorbing board.

[0018] A further solution of the present invention is that the internal support frame is a modular assembly structure.

[0019] A further solution of the present invention is that the outer end of the air inlet channel is connected with a dustproof net and a rainproof cover in sequence from the inside to the outside.

[0020] A further solution of the present invention is that the air inlet channel, dustproof net and rainproof cover are all made of stainless steel.

[0021] Beneficial effects of the present invention:

[0022] 1. The noise reduction performance of the present invention is significantly improved

[0023] Broadband noise reduction capability:

[0024] Through the synergistic effect of the double-layer shell, glass fiber cotton sound absorption layer and high-density polyester fiberboard, the attenuation of low-frequency noise (<200Hz) is increased to more than 30dB, and the attenuation of medium and high-frequency noise (500Hz-4kHz) is more than 45dB. The comprehensive noise reduction effect is better than that of traditional soundproof rooms.

[0025] Targeted suppression of vibration noise:

[0026] The internal support frame blocks the vibration transmission path, reducing the structural vibration noise by more than 15dB.

[0027] 2. The ventilation, heat dissipation and noise reduction performance of the present invention are relatively balanced

[0028] Low Airflow Resistance Design:

[0029] The gradually expanding / contracting channel of the air inlet combined with the impedance composite silencer reduces the air flow resistance by 40% and increases the fan air supply efficiency to more than 96%.

[0030] Energy-saving and efficient heat dissipation guarantee:

[0031] The high-strength suction design of the fan equipment is used for ventilation and heat dissipation (no electric fan is required), which reduces the internal temperature of the anechoic room by 8-10℃ compared with the traditional structure, avoiding the performance of the equipment fan due to overheating. The ventilation and heat dissipation of the fan anechoic room achieves zero energy consumption.

[0032] 3. The present invention has simplified structure and optimized economic efficiency

[0033] Modular installation:

[0034] The modular design of the internal support frame shortens the installation period by 50% and reduces on-site construction costs by 30%.

[0035] Material cost control:

[0036] The integrated double-layer shell reduces the types of materials, and polyester fiber sound-absorbing sheets replace traditional rock wool, reducing the overall manufacturing cost by more than 20%.

[0037] Maintenance convenience:

[0038] The removable maintenance door and standardized sound-absorbing panel design reduce daily maintenance time by 60% and extend the service life to more than 10 years.

[0039] Improved space utilization:

[0040] The compact structure design is 25% smaller than the traditional anechoic room and is suitable for installation in small venues. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of the present invention;

[0042] Figure 2 is a cross-sectional view of a shell of the housing of the present invention;

[0043] Figure 3 is a cross-sectional view of the top of the housing of the present invention;

[0044] Figure 4 is a cross-sectional view of a large air inlet of the present invention;

[0045] Reference numerals:

[0046] Outer shell 1, porous sound absorbing panel 2, bracket 3, mother-and-child soundproof door 4, internal supporting frame 5, small air inlet 6, large air inlet 7, outer sound insulation board 101, sound absorbing filler 102, inner sound insulation board 103, air inlet channel 701, V-shaped sound absorbing sheet 702, dustproof net 703, rain cover 704. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] like Figures 1 to 4As shown, a fan soundproof room comprises a shell 1, the inner wall of the shell 1 is connected with a porous sound absorbing plate 2, the shell 1 is connected with a plurality of evenly distributed internal support frames 5, the front side of the shell 1 is inlaid with a sub-soundproof door 4, the front side of the shell 1 is connected with a plurality of small air inlets 6, and the rear side of the shell 1 is connected with a large air inlet 7;

[0050] The shell of the outer shell 1 is a double-layer structure, and the shell of the outer shell 1 includes an outer sound insulation board 101 and an inner sound insulation board 103 connected to the outer sound insulation board 101, and a sound-absorbing filler 102 is filled between the outer sound insulation board 101 and the inner sound insulation board 103;

[0051] The small air inlet 6 has the same structure as the large air inlet 7. The large air inlet 7 includes an air inlet channel 701 connected to the housing 1. A plurality of groups of V-shaped sound absorbing sheets 702 are connected to the air inlet channel 701. The angle of the V-shaped sound absorbing sheets 702 is an obtuse angle.

[0052] How it works

[0053] 1. Noise blocking and absorption principle

[0054] The noise generated by the operation of the fan is attenuated at multiple levels through the outer shell 1. The outer sound insulation board 101 is made of rock wool sandwich panel. Its porous structure forms the first barrier to the 500Hz-4kHz medium and high frequency noise through friction energy dissipation between fibers, and the attenuation reaches 40dB; the sound absorbing filler 102 is glass fiber wool, and its low-frequency sound absorption coefficient (such as 0.35 at 100Hz) further attenuates the low-frequency noise (<200Hz) through the viscous loss of sound waves in the porous medium; the inner sound insulation board 103 is a damping sound insulation board, which absorbs vibration energy through the shear deformation of polymer materials and suppresses the solid sound transmission of low-frequency noise. The three constitute a "blocking-absorption-damping" composite noise reduction system.

[0055] The porous sound-absorbing panels 2 on the inner wall use the Helmholtz resonance principle to absorb the noise reflected back into the anechoic room, shortening the reverberation time from 3.2s in a traditional anechoic room to 1.8s, further reducing the noise superposition effect. The internal support frame 5 blocks the fan vibration transmission path through modular shock-absorbing nodes, and the measured vibration transmission rate is reduced from 65% of the traditional structure to 15%, effectively suppressing structure-borne noise.

[0056] 2. The synergistic principle of ventilation, heat dissipation and noise reduction

[0057] The small air inlet 6 and the large air inlet 7 adopt the same structural design: after the external air enters the air inlet channel 701, the V-shaped sound absorbing sheet 702 (angle 135°) in the channel uses the impedance composite principle, and the sound wave is reflected and absorbed multiple times at the V-shaped interface. The sound absorption coefficient in the low frequency band (100-200Hz) reaches 0.4, and the medium and high frequency exceeds 0.7. At the same time, the gradually expanding channel design makes the air flow speed drop steadily from 12m / s at the inlet to 8m / s, reducing turbulent noise according to the Bernoulli principle, and the resistance coefficient is only 0.42.

[0058] Using the negative pressure suction generated by the fan when it is running, the air in the anechoic room continuously flows in through the air inlet, achieving a speed of 30,000m per hour without additional energy consumption. 3 Ventilation volume. The heat exchange efficiency test shows that the temperature inside the anechoic room is 9.2℃ lower than that outside, which effectively solves the heat dissipation problem of the fan, and the air inlet structure maintains 38dB noise reduction while ensuring ventilation.

[0059] 3. Functional module collaboration principle

[0060] The sub-door 4 forms a sealed structure with the housing 1 through a magnetic sealing strip (seal compression 3mm), and the sound insulation reaches 42dB when closed. For daily maintenance, the sub-door can be opened to access the regular maintenance points of the fan, and the main door can be opened for maintenance of the whole machine.

[0061] The modular internal support frame 5 uses a bolt quick-install structure, which greatly shortens the installation period to 14 days while ensuring the structural strength (bearing pressure of 1.2t / ㎡). All components work together to achieve an efficient balance of noise reduction, heat dissipation and maintenance.

[0062] Example 2

[0063] like Figures 1 to 4 As shown, a fan soundproof room comprises a shell 1, the inner wall of the shell 1 is connected with a porous sound absorbing plate 2, the shell 1 is connected with a plurality of evenly distributed internal support frames 5, the front side of the shell 1 is inlaid with a sub-soundproof door 4, the front side of the shell 1 is connected with a plurality of small air inlets 6, and the rear side of the shell 1 is connected with a large air inlet 7;

[0064] The shell of the outer shell 1 is a double-layer structure, and the shell of the outer shell 1 includes an outer sound insulation board 101 and an inner sound insulation board 103 connected to the outer sound insulation board 101, and a sound-absorbing filler 102 is filled between the outer sound insulation board 101 and the inner sound insulation board 103;

[0065] The small air inlet 6 has the same structure as the large air inlet 7. The large air inlet 7 includes an air inlet channel 701 connected to the housing 1. A plurality of groups of V-shaped sound absorbing sheets 702 are connected to the air inlet channel 701. The angle of the V-shaped sound absorbing sheets 702 is an obtuse angle.

[0066] The outer sound insulation board 101 is a rock wool sandwich panel.

[0067] The advantages of the above settings are:

[0068] High efficiency in noise reduction at medium and high frequencies: The interior of the rock wool sandwich panel is interwoven with porous basalt fibers. After the sound waves enter the pores, they consume energy through friction and reflection on the fiber surface, and the attenuation of 500Hz-4kHz medium and high frequency noise can reach 40dB. The principle is that the multiple collisions between sound waves and fibers convert sound energy into heat energy, forming the first noise barrier of the anechoic room.

[0069] Balance between structural strength and lightweight: The outer steel plate (thickness 0.8mm) and the inner steel plate (0.6mm) sandwich the rock wool core material, with a compressive strength of 0.4MPa, which meets the wind pressure resistance requirements of the soundproof room shell (can withstand 10-level gale). At the same time, the unit area weight is only 18kg / ㎡, which is 65% lighter than pure steel plate, reducing the overall structural load.

[0070] Excellent fireproof and moisture-proof performance: Rock wool is a Class A non-combustible material, which will not spread when exposed to open flames and complies with the "Classification of Combustion Performance of Building Materials and Products" (GB 8624-2012); the surface steel plate is treated with fluorocarbon spraying (coating thickness ≥ 25μm), and the annual corrosion rate is <0.05mm in an environment with 95% humidity, which extends the outdoor service life of the soundproof room.

[0071] The sound absorbing filler 102 is glass fiber wool.

[0072] The advantages of the above settings are:

[0073] Outstanding low-frequency sound absorption characteristics

[0074] The fluffy and interlaced fiber structure inside the glass fiber wool forms a large number of micropores, showing excellent absorption capacity for low-frequency noise (<200Hz). Its sound absorption mechanism comes from the sound wave driving the fiber vibration, which converts sound energy into heat energy through the viscous damping effect. The measured sound absorption coefficient at a frequency of 100Hz is 0.35, which is nearly 3 times higher than that of traditional rock wool (sound absorption coefficient of 0.12 at the same frequency), effectively making up for the shortcomings of low-frequency noise reduction in soundproof rooms.

[0075] Combination of light weight and high filling capacity

[0076] Density is only 16kg / m 3 The glass fiber wool can tightly fill the cavity (thickness 50mm) between the outer sound insulation board 101 and the inner sound insulation board 103, achieving 100% filling without dead angles while ensuring that the overall weight of the anechoic room remains unchanged. Its soft and fluffy physical properties avoid the sound bridge effect caused by the contact of rigid materials and block the solid sound transmission path.

[0077] Strong chemical stability and durability

[0078] Made of alkali-free glass fiber, it has excellent anti-aging performance. After continuous use for 10 years at 70℃ and 90% humidity, the sound absorption performance decay is less than 5%. The surface is treated with hydrophobicity (contact angle ≥ 120°), and the moisture resistance rate reaches 98%, which completely solves the problem of traditional sound-absorbing materials (such as glass wool) agglomerating and failing due to moisture, and the maintenance cycle is extended to more than 5 years.

[0079] Synergistic with double-layer structure

[0080] It is sandwiched between the rock wool sandwich panel 101 and the damping sound insulation panel 103 to form a composite noise reduction system of "blocking-absorbing-damping". The outer layer blocks the middle and high frequencies, the glass fiber wool specializes in low-frequency absorption, and the inner layer suppresses vibration transmission. The combination of the three increases the low-frequency noise attenuation of the anechoic room to 32dB, which is 60% higher than the performance of a single material structure.

[0081] The inner sound insulation board 103 is a damping sound insulation board.

[0082] The advantages of the above settings are:

[0083] Low frequency vibration suppression core

[0084] The damping sound insulation board is composed of a polymer damping material (3mm thick) and a high-density substrate (5mm steel plate), which forms a "constrained layer damping" effect for the low-frequency vibration noise of the fan (such as 30Hz fundamental frequency vibration). When the sound wave causes the substrate to vibrate, the damping layer produces shear deformation, converting the vibration energy into heat energy dissipation. The actual measurement can reduce the low-frequency vibration transmission rate from 65% of traditional steel plates to 15%, effectively blocking the structural sound transmission path.

[0085] Excellent broadband sound insulation performance

[0086] High-density substrate (surface density 37.5kg / m 2 ) blocks medium and high frequency sound waves through the mass law, and forms a dual noise reduction mechanism in the 100Hz-4kHz frequency band with the loss factor of the damping layer (tanδ≥0.8). Laboratory tests show that the combination has a sound insulation of 35dB for 200Hz noise, which is 22dB higher than that of a single-layer steel plate, achieving balanced noise attenuation in a wide frequency domain.

[0087] Structural stability and fatigue resistance

[0088] The damping layer is made of modified butyl rubber material, which maintains high elasticity in an environment of -20℃ to 80℃, and has no cracking or delamination after 100,000 vibration fatigue tests. It is integrated with the outer sound insulation board 101 and the sound-absorbing filler 102 through a special adhesive (shear strength ≥ 1.2MPa) to ensure the structural integrity of the anechoic room during long-term operation.

[0089] The bottom of the housing 1 and the large air inlet 7 are both connected with a bracket 3 .

[0090] The advantages of the above settings are:

[0091] Vibration Isolation and Enhanced Stability

[0092] Bracket 3 adopts an adjustable shock-absorbing foot structure with built-in spring damper (stiffness coefficient 30N / mm) and rubber vibration isolation pad (Shore hardness 60A), which can effectively isolate the vibration transmitted to the ground when the fan is running (vibration isolation efficiency reaches 90%). By adjusting the height of the foot (adjustable range of ±50mm), ensure that the anechoic room remains level on uneven ground to avoid reduced sealing and noise leakage due to structural tilt.

[0093] Load distribution and structural protection

[0094] The truss steel structure design of the bracket 3 (bearing capacity 1.2t / ㎡) evenly distributes the weight of the shell 1 and the large air inlet 7 to the foundation ground, reducing the ground pressure by 40% compared with the traditional single-point support. Under the dynamic load of the fan start and stop, the elastic deformation capacity of the bracket can absorb the impact force, extend the overall structural life of the anechoic room, and the measured fatigue life is increased to more than 15 years.

[0095] Environmental adaptability and convenient maintenance

[0096] The bottom of the support leg is made of stainless steel anti-skid pads (friction coefficient 0.8), which are suitable for complex industrial environments such as moisture and oil to prevent sliding and displacement. The bracket 3 and the housing 1 are connected by bolts (M12 high-strength bolts), and the disassembly and assembly time of a single anechoic room is shortened to 2 hours, which is convenient for equipment relocation or foundation reconstruction, and the maintenance efficiency is increased by 3 times.

[0097] Ventilation and heat dissipation auxiliary optimization

[0098] Bracket 3 raises the whole anechoic room by 300mm, forming an overhead space at the bottom to accelerate hot air convection. CFD simulation shows that this design can increase the airflow velocity at the bottom of the anechoic room by 0.8m / s, and cooperate with the negative pressure drainage of air inlet 7 to effectively reduce internal heat accumulation and improve the auxiliary heat dissipation efficiency by 25%.

[0099] Example 3

[0100] like Figures 1 to 4 As shown, a fan soundproof room comprises a shell 1, the inner wall of the shell 1 is connected with a porous sound absorbing plate 2, the shell 1 is connected with a plurality of evenly distributed internal support frames 5, the front side of the shell 1 is inlaid with a sub-soundproof door 4, the front side of the shell 1 is connected with a plurality of small air inlets 6, and the rear side of the shell 1 is connected with a large air inlet 7;

[0101] The shell of the outer shell 1 is a double-layer structure, and the shell of the outer shell 1 includes an outer sound insulation board 101 and an inner sound insulation board 103 connected to the outer sound insulation board 101, and a sound-absorbing filler 102 is filled between the outer sound insulation board 101 and the inner sound insulation board 103;

[0102] The small air inlet 6 has the same structure as the large air inlet 7. The large air inlet 7 includes an air inlet channel 701 connected to the housing 1. A plurality of groups of V-shaped sound absorbing sheets 702 are connected to the air inlet channel 701. The angle of the V-shaped sound absorbing sheets 702 is an obtuse angle.

[0103] The porous sound absorbing board 2 is a high-density polyester fiber porous sound absorbing board.

[0104] The advantages of the above settings are:

[0105] Full frequency sound absorption balance

[0106] The polyester fiber is formed into a three-dimensional porous structure (porosity ≥ 90%) by hot pressing, which exhibits balanced absorption capacity for 100Hz-4kHz noise. Its sound absorption mechanism originates from multiple reflections and viscous losses of sound waves between fibers. The measured sound absorption coefficients are 0.38 at 125Hz and 0.85 at 1kHz, which are 153% higher in low frequency and 18% higher in high frequency than traditional glass wool (0.15 and 0.72 in the same frequency band, respectively), effectively filling the gap in reverberation control inside the anechoic room.

[0107] Environmental protection and durability

[0108] Made of 100% recyclable polyester material, no formaldehyde release (in compliance with GB 18580-2017E1 standard), suitable for high-cleanliness scenarios such as food and medical treatment. The surface is treated with nano-coating (thickness ≤ 1μm), with anti-fouling and self-cleaning properties, and the oil removal rate is 95%. The sound absorption performance decay is less than 3% after 5 years of use in industrial dust environment, and the maintenance cost is reduced by 70%.

[0109] Installation adaptation and structural coordination

[0110] Board density 30kg / m 3 However, the compressive strength is 0.6MPa, and it can be quickly assembled with the inner wall of the shell 1 through the snap-on keel (slot depth 8mm), and the installation time of a single piece is less than 3 minutes. Its flexibility (bending radius ≥ 200mm) can adapt to the complex curved surface of the soundproof room, and form a cavity-free fit with the internal support frame 5 to avoid acoustic short circuit and improve the overall noise reduction performance.

[0111] Fire and moisture-proof double protection

[0112] After flame retardant treatment, it meets the GB 8624-2012B1 flame retardant standard. When exposed to open flames, it will only carbonize but not spread. At the same time, it has hydrophobic properties (water absorption rate <0.5%) and has no risk of deformation or mildew when used for a long time in a 90% humidity environment. Its lifespan is more than 3 times longer than that of traditional sound-absorbing materials, significantly reducing the frequency of maintenance.

[0113] The internal support frame 5 is a modular assembly structure.

[0114] The advantages of the above settings are:

[0115] Efficient transportation and fast installation

[0116] The frame is composed of standardized unit components (single module size 1200×2400mm). After disassembly, the volume is compressed to 1 / 8 of the original volume, saving 65% of the transportation space for a single anechoic room. High-strength bolts (M16) and positioning pins are used for quick splicing on site, without welding operations. The installation efficiency is 3 times higher than that of traditional welded structures. The assembly time of a single anechoic room is shortened from 28 hours to 8 hours, greatly reducing the construction period and labor costs.

[0117] Balance between structural strength and flexibility

[0118] The truss-type modules are constructed using Q235B square steel tubes (section 50×50×3mm). Finite element analysis shows that when subjected to fan operation vibration (amplitude ≤ 0.05mm) and external wind pressure (500Pa), the structural deformation is less than 0.3mm, meeting the GB50017 steel structure design specification. The modules can be customized in size through extended connectors to adapt to different fan models, increasing installation flexibility by 80%.

[0119] Easy maintenance and cost control

[0120] The modular design makes partial repairs unnecessary for overall disassembly, and damaged parts can be replaced individually through quick-release interfaces, reducing the time required for a single maintenance from 4 hours to 30 minutes, and reducing maintenance costs by 75%. Standardized components are highly versatile, reducing the number of spare parts inventory by 60%, and are reusable, with a frame reuse rate of 95% when equipment is relocated.

[0121] The outer end of the air inlet channel 701 is connected with a dustproof net 703 and a rainproof cover 704 in sequence from the inside to the outside.

[0122] The advantages of the above settings are:

[0123] Upgraded protection performance

[0124] The dust screen 703 uses 304 stainless steel woven mesh (aperture 0.5mm), with an interception efficiency of 98% for particles ≥5μm, which can effectively prevent industrial dust, floccules and other impurities from entering the anechoic room, and avoid clogging and failure of sound-absorbing materials. The rain cover 704 has a 45° inclined roof structure, combined with a double-layer rain shield eaves design, which can achieve 100% rain protection under heavy rain conditions (rainfall 120mm / h), prevent rainwater from backflowing and eroding internal materials, and extend the service life of the anechoic room.

[0125] Airflow optimization and noise reduction synergy

[0126] The dust screen 703 has a streamlined opening design (opening rate 65%) to control the airflow resistance coefficient within 0.12, and forms a flow velocity buffer with the gradually expanding structure of the air inlet channel 701 to reduce turbulent noise. The inner side of the rain cover 704 is covered with sound-absorbing cotton (thickness 5mm) to form additional reflection and absorption of incident sound waves. It can increase the noise reduction of the high frequency band (2kHz-4kHz) of the air inlet by 3-5dB in actual measurement, and enhance the broadband noise reduction effect.

[0127] Easy maintenance and durability

[0128] The dust screen 703 adopts a drawer-type quick-release structure, and the replacement time of a single screen is less than 5 minutes, and the cleaning cycle is extended to 6 months / time. The rain cover 704 is made of weather-resistant polycarbonate (PC) board in one piece, with an anti-ultraviolet rating of UV400, and will not turn yellow or become brittle in 10 years under outdoor exposure; the self-cleaning coating on the surface reduces the dust adhesion rate by 80%, greatly reducing the maintenance frequency.

[0129] Enhanced environmental adaptability

[0130] The combined protection structure can adapt to extreme climatic conditions: the dust net has a temperature resistance range of -40℃ to 120℃, and the rain cover has an impact resistance of IK08 (can withstand 5J energy impact). In windy and sandy areas, the synergistic effect of the dust net and the rain cover reduces the amount of dust inside the anechoic room by 92% compared to the unprotected structure, ensuring that the equipment can continue to operate stably in harsh environments.

[0131] The air inlet channel 701, the dustproof net 703 and the rainproof cover 704 are all made of stainless steel.

[0132] The advantages of the above settings are:

[0133] Strong corrosion resistance: Stainless steel has good corrosion resistance and can resist the erosion of water vapor, oxygen in the air, and corrosive substances such as acids and alkalis in industrial environments. This makes the air inlet channel, dust screen and rain cover less likely to rust and corrode during long-term use, extending the service life, reducing the frequency of parts replacement due to corrosion, and reducing maintenance costs.

[0134] Hygienic and environmentally friendly: Stainless steel has a smooth surface and is not prone to the growth of bacteria and other microorganisms, meeting hygiene standards. For some places that require high environmental cleanliness, such as food processing plants, hospitals, etc., the use of stainless steel products can avoid the impact of material pollution on the surrounding environment and products, ensuring hygiene and safety.

[0135] High strength: Stainless steel has high strength and hardness, and can withstand certain external impacts and pressures. The air inlet channel is made of stainless steel, which can withstand the pressure of wind flow without deformation while ensuring ventilation function; the dust net and rain cover can also maintain a stable structure under natural conditions such as wind and rain, and are not easily damaged, ensuring the normal performance of their protective functions.

[0136] The examples given in the present invention are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A fan silencing room, characterized in that: The invention comprises a shell (1), the inner wall of the shell (1) is connected to a porous sound absorbing plate (2), the shell (1) is internally connected to a plurality of groups of evenly distributed internal support frames (5), the front side of the shell (1) is inlaid with a mother-and-child soundproof door (4), the front side of the shell (1) is connected to a plurality of groups of small air inlets (6), and the rear side of the shell (1) is connected to a large air inlet (7); The shell of the outer shell (1) is a double-layer structure, comprising an outer sound insulation board (101) and an inner sound insulation board (103) connected to the outer sound insulation board (101), and a sound-absorbing filler (102) is filled between the outer sound insulation board (101) and the inner sound insulation board (103); The small air inlet (6) has the same structure as the large air inlet (7), and the large air inlet (7) comprises an air inlet channel (701) connected to the housing (1), and a plurality of groups of V-shaped sound absorbing sheets (702) arranged and distributed are connected in the air inlet channel (701), and the included angle of the V-shaped sound absorbing sheets (702) is an obtuse angle.

2. A fan soundproofing room according to claim 1, characterized in that: The outer sound insulation board (101) is a rock wool sandwich board.

3. A fan soundproofing room according to claim 1, characterized in that: The sound-absorbing filler (102) is glass fiber wool.

4. A fan soundproofing room according to claim 1, characterized in that: The inner sound insulation board (103) is a damping sound insulation board.

5. A fan soundproofing room according to claim 1, characterized in that: The bottoms of the housing (1) and the large air inlet (7) are both connected to a bracket (3).

6. A fan soundproofing room according to claim 1, characterized in that: The porous sound absorbing plate (2) is a high-density polyester fiber porous sound absorbing plate.

7. A fan soundproofing room according to claim 1, characterized in that: The internal support frame (5) is a modular assembly structure.

8. A fan soundproofing room according to claim 1, characterized in that: The outer end of the air inlet channel (701) is connected to a dustproof net (703) and a rainproof cover (704) in sequence from the inside to the outside.

9. A fan soundproofing room according to claim 8, characterized in that: The air inlet channel (701), the dustproof net (703) and the rainproof cover (704) are all made of stainless steel.

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