In industrial production, the aerodynamic noise from equipment such as fans and valves seriously affects the environment. Due to its highly efficient noise reduction characteristics, small hole mufflers have become a key solution. Lianyungang Bojingyuan Machinery Equipment Co., LTD., as a source manufacturer specializing in the research and development and production of small hole mufflers for over 10 years, leads the industry with professional technology and customized services.
I. Core Working Principle: The scientific logic of precise noise reduction
The small hole muffler adopts a combined design of "small hole injection + reactive resonance", and its noise reduction mechanism conforms to the principles of aerodynamics and acoustics.
Small hole injection noise reduction: When the airflow passes through a 1-3mm small hole, the flow rate is reduced from 30-50m/s to 5-10m/s, reducing the noise caused by turbulence disturbance. At the same time, the noise energy is transferred from the low-frequency band (200-500Hz) that the human ear is sensitive to to the high-frequency band (above 1000Hz). The air attenuation coefficient of high-frequency noise (about 0.5dB/m) is much greater than that of low-frequency noise (about 0.1dB/m), achieving initial noise reduction.
Reactive resonance noise reduction: The internal chambers and small hole arrays form Helmholtz resonators, which resonate and absorb specific frequency noises such as the fundamental frequency of the fan, further enhancing the noise reduction effect.
The overall noise reduction can reach 20-40dB(A), and the resistance loss is ≤5% of the system pressure, in compliance with the GB/T 4760-2017 "Measurement Methods for Acoustic Mufflers" standard.
Ii. Selection Guide: Professional Criteria for Matching as Needed
The selection should follow the "Four Matches" principle to ensure that the muffler is perfectly compatible with the system:
Medium matching: For steam (≤400℃), 304 stainless steel is selected. For dust media, thickened carbon steel (wear-resistant) is selected. For harmful gases (such as hydrogen sulfide), choose polytetrafluoroethylene lining (anti-corrosion).
Pressure matching: For low pressure (0-1 mpa), select PN1.0; For medium pressure (1-10 mpa), select PN10. For high pressure (≥10MPa), select PN16 or above to avoid overpressure damage.
Flow matching: Calculate the diameter (DN50-DN500 is optional) through the formula Q=3600×A×v (Q represents the flow rate in m³/h, A represents the diameter area in m², and v is recommended to be 5-10m/s) to ensure low airflow resistance.
Frequency matching: For low-frequency noise (≤500Hz), increase the volume of the resistance chamber (2-3 times the diameter); High-frequency noise (≥1000Hz) is enhanced with a small hole array (4-6 small holes per square centimeter) to achieve precise noise reduction.
Iii. Installation Key Points: A crucial step to ensure performance
Correct installation directly affects the noise reduction effect. The following points should be noted:
Near-source installation: As close as possible to the noise source (such as the fan outlet), with a distance of no more than 2 meters, to avoid a decrease in noise reduction due to sound transmission through pipes (for every additional meter of pipe, the noise reduction decreases by 5%).
Sealing connection: Flange connection requires a sealing gasket of ≥3mm (asbestos/rubber), and the bolts should be evenly tightened (torque 20-30N·m) to ensure no leakage (leakage will reduce the noise reduction by 20%-30%).
Stable support: For specifications of DN300 and above, rigid brackets (Angle iron/channel steel) should be installed and fixed with M10 expansion bolts to prevent deformation of the pipeline under force.
Correct direction: The airflow direction must be consistent with the muffler marking. Reverse installation will cause the noise reduction effect to fail.
Iv. Follow-up Maintenance: Practical Tips for Extending Lifespan
Regular maintenance can keep the muffler stable (with a lifespan of 5 to 8 years). Specific measures:
Monthly inspection: Check if the appearance is corroded or deformed, and if the flange bolts are loose (if loose, they need to be retightened).
Quarterly cleaning: For mufflers with dust in the medium, remove the end cover and blow the small holes with 0.5-0.8MPa compressed air (blockage will reduce the noise reduction by 15%-20%).
Annual maintenance: Check if the internal chamber is damaged (repair by welding), replace aged sealing gaskets (such as cracked rubber gaskets), and ensure stable noise reduction performance.
V. Procurement Channels: The advantages of Choosing the original manufacturer
Lianyungang Bojingyuan, as the original manufacturer of small hole mufflers, has the following core advantages
Customized services: We can design and produce according to special media (such as high-temperature steam, harmful gases) and non-standard sizes (such as DN300 and above) to meet customers' personalized demands.
Quality Assurance: The products have passed the ISO9001 quality system certification. Each unit is accompanied by a performance test report (noise reduction, resistance loss, etc.), meeting national and industry standards.
High cost performance: Direct purchase from the source avoids price hikes by middlemen, and the price is 10%-20% lower than the market price. We offer "1-year free warranty and lifetime technical support". Any quality issues within the warranty period will be replaced free of charge.
Fast delivery: Regular specifications (DN50-DN200) are in sufficient stock and will be dispatched within 24 hours. Customized specifications are delivered within 7 to 15 days to meet urgent needs.
The selection of small hole mufflers is related to the noise reduction effect and production efficiency. Lianyungang Bojingyuan Machinery Equipment Co., Ltd. has become the preferred partner for industrial noise reduction with its authoritative technology, professional products and perfect services. Choose Bojingyuan to make your noise reduction more efficient and worry-free. | 