The following is a design proposal for the sound insulation cover of Roots blower, covering material selection, structural design, noise reduction effect, and practical installation suggestions, suitable for noise control in industrial and aquaculture scenarios:
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**1、 Core design elements of soundproof hood**
**1. Noise reduction target**
-Industrial standard: Reduce fan noise from 90~110dB to below 75dB (in compliance with the Industrial Enterprise Noise Hygiene Standard).
-* * Civilian requirement * *: The surrounding area of the breeding farm/residential area must be ≤ * * 65dB * * (nighttime standard).
**2. Material combination (layered sound insulation)**
|* * Layered Structure * * | * * Material and Thickness * * | * * Function * *|
|------------------|----------------------------|--------------------------|
|* * Outer layer * * | 1.5mm galvanized steel plate (spray anti-corrosion) | Partition medium high frequency noise|
|* * Intermediate layer * * | 50mm rock wool (density ≥ 80kg/m3) | Absorbs mid to low frequency vibrations|
|* * Inner layer * * | Perforated aluminum plate (aperture 2mm, aperture ratio 30) | Sound wave reflection and dissipation|
|* * Seam treatment * * | Rubber sealing strip (oil resistant type) | Prevent sound leakage|
**3. Key structural design**
-* * Detachable panel * *: maintenance door+hydraulic rod support (magnetic sealing strip added at the door gap).
-Ventilation and heat dissipation:
-Imported soundproof louvers (noise reduction of 15dB, wind resistance ≤ 50Pa).
-Axial flow exhaust fan (low-noise type, ≤ 60dB).
-* * Shock absorption foundation * *: Install * * spring shock absorbers * * between the soundproof cover and the fan to avoid resonance transmission.
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**2、 Customized parameter calculation**
**1. Formula for size of soundproof cover**
-* * Length/Width * *: Overall dimensions of the fan+600mm (maintenance space).
-* * Height * *: Top of fan+800mm (including installation position of pipeline muffler).
-* * Example * *:
The size of the Roots blower is 1200 × 800 × 1000mm, and the recommended soundproof cover is 1800 × 1400 × 1800mm.
**2. Estimation of noise reduction effect**
-Insertion Loss (IL):
\( IL = 10 \times \log_{10}(1/\tau) \)
(\ (\ tau \): Transmission coefficient, rock wool+steel plate combination usually τ≈ 0.001, IL ≈ 30dB)
-Actual effect:
-Reduce 125Hz low-frequency noise by 20dB
-Reduce the high-frequency by 35dB at 1000Hz
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**3、 Key points for installation and use**
**1. Installation steps**
1. Pre installed shock absorber: The fan base is isolated from the ground (with a shock absorption efficiency of ≥ 80).
2. Assembly of cover body: bolted connection+sealant filling of joints.
3. * * Pipeline Processing * *:
-Install rubber flexible joints at the inlet and outlet of the fan.
-Wrap the wall penetrating pipeline with * * sound-absorbing cotton * *.
**2. Maintenance precautions**
-* * Heat dissipation management * *: Monitor the temperature inside the hood in summer (≤ 45 ℃), and add exhaust fans if necessary.
-* * Regular inspection * *: Clean the sound-absorbing cotton dust every quarter and check the aging condition of the sealing strip.
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**4、 Cost and selection reference**
|* * Type * * | * * Material and Configuration * * | * Price Range (Yuan) * * | * * Applicable Scenarios * *|
|------------------|----------------------------|------------------|---------------------|
|* * Economic type * * | Color steel plate+glass wool, manual maintenance door | 5000-10000 | Small scale breeding farm (below 7.5kW)|
|* * Industrial standard type * * | Galvanized steel plate+rock wool, automatic cooling system | 15000-30000 | Factory 55kW fan|
|* * High anti-corrosion type * * | 304 stainless steel+ceramic fiber, IP54 protection | 30000-50000 | Chemical/coastal areas|
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**5、 DIY Easy Solution (Low Cost)**
-* * Material * *:
-Outer layer: multi-layer corrugated cardboard+aluminum foil (temporary use).
-Inner layer: Used carpet or polyester fiberboard.
-* * Effect * *: can reduce noise by 10-15 dB, suitable for temporary noise reduction needs.
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**6、 Precautions**
1. * * Strictly prohibit sealing * *: Ventilation channels must be preserved to avoid motor overheating.
2. * * Distance * *: The distance between the soundproof cover and the fan casing is ≥ 200mm (anti).
3. * * Noise detection * *: After installation, a decibel meter should be used to measure at a distance of 1 meter (in accordance with GB 12348-2008 standard).
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**Recommended supplier * *:
-* * Professional customization * *: Shanghai Sairui Sound Insulation, Beijing Jingyuan Environmental Protection (providing acoustic simulation design).
-* * Finished product procurement * *: Search for "Roots blower soundproof cover" on Alibaba (supports size customization).
For precise design, please provide:
1. Fan model/size;
2. On site noise spectrum (optional);
3. Installation environment (indoor/outdoor, temperature and humidity).
