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Muffler
A muffler is a device that allows airflow while blocking or reducing sound propagation, serving as a critical solution for mitigating aerodynamic noise. It effectively controls noise by attenuating sound waves without restricting airflow. Mufflers come in various types, primarily categorized into six mechanisms: resistive, reactive, impedance composite, microperforated panel, small-hole, and active noise cancellation.
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Product introduction
A muffler is a device that allows airflow while blocking or reducing sound propagation, serving as a critical solution for mitigating aerodynamic noise. It effectively controls noise by attenuating sound waves without restricting airflow. Mufflers come in various types, primarily categorized into six mechanisms: resistive, reactive, impedance composite, microperforated panel, small-hole, and active noise cancellation.
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A microperforated panel (MPP) absorber consists of thin panels (<1.0 mm thickness) with microholes (≤1.0 mm diameter) at a perforation rate of 1–5%, backed by an air cavity (5–20 cm thick) without additional absorbent material. This design creates a low acoustic mass and high acoustic resistance resonant structure. The sound absorption coefficient and bandwidth depend on the panel’s acoustic mass (*m*) and resistance (*r*), which correlate with hole diameter (*d*) and perforation rate (*p*).
Key Features of MPP Mufflers:
● Material: Stainless steel microperforated panels with corrosion-resistant metal mesh filling for harsh environments (e.g., petrochemical plants).
● Performance: High absorption coefficient, broad frequency bandwidth, low pressure loss, minimal airflow-generated noise.
● Design: Typically uses a three-stage MPP structure for wideband absorption. Cavity dimensions vary by target frequency:
○ Low-frequency: 150–200 mm
○ Mid-frequency: 80–120 mm
○ High-frequency: 30–50 mm
● Optimization: Front cavity depth < rear cavity (ratio ≤1:3); higher perforation rate on the front panel. Transverse baffles spaced every 500 mm reduce axial noise propagation.
Advantages:
Maintains >15 dBA noise reduction even at 70 m/s airflow velocity (where conventional mufflers fail).
Temperature-independent performance.
Anti-Jet Resistance Muffler Design
This muffler combines microperforated panel principles with a multi-stage pressure reduction system:
1、Flow Control: High-pressure steam passes through a controlled flow into an expansion chamber, reducing pressure.
2、Noise Absorption: Low-pressure steam exits through microholes, with residual noise absorbed by an external acoustic barrier.
3、Performance: Achieves >35 dB(A) noise reduction (stage ratios: 35% primary, 50% secondary, 15% tertiary).
Company Profile
Luoyang Yixin Environmental Technology Co., Ltd.
● Established: 1987 (formerly Luoyang Lanxin Environmental Engineering Co., Ltd.).
● Location: Xinan Industrial Cluster, Luoyang (50,000 m² facility).
● Registration: Equity Code 201534; Registered Capital 80 million RMB.
● Expertise: R&D and production of dust removal, desulfurization, denitrification, and ultra-low emission systems; EPC services for design, installation, and commissioning.
● Certifications:
○ National High-Tech Enterprise
○ Henan Provincial Sci-Tech SME
○ Member of Henan & Luoyang Environmental Protection Associations
● Collaborations: Partnerships with universities and research institutes; 30+ mid-to-senior technical experts.
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- 消声器
Keyword:
Environmental Protection Equipment
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The company mainly produces various dust removal, desulfurization, denitrification, VOCs waste gas purification, wastewater treatment, noise reduction, complete sets of industrial electrical control systems and equipment, and researches and develops waste gas, wastewater, waste residue, and noise treatment equipment.
Contact Us
Telephone:+86-379-67323008
Phone:+86-5824998401
+86-9838965599
Email:yx23008@163.com
Address: Xin'an County Economic and Technological Development Zone, Luoyang City, Henan Province
