Overview of blower muffler:

The blower muffler is mainly suitable for reducing the intake and exhaust noise of Roots series and axial flow series fans. The blower muffler can also be used for noise reduction of exhaust pipes and other high-pressure fans, with a noise reduction amount of 10-20dB (A) and a pressure loss of less than 500Pa.

Standard model of blower muffler

1. Impedance acoustic flow ventilation, exhaust pipes, and fan eliminator structure principle:

Based on the frequency spectrum data obtained from inter site testing of various types of industrial wind turbines, the main basis for designing sound absorbing bodies and fluid channels is to determine which frequency range requires a large amount of noise reduction. At the same time, narrow rectangular channels with larger sound absorbing material finishes are used to enhance absorption results. In addition, the noise of a fan often has more than one spectral value when there is large noise, and the requirements for noise reduction vary for different spectral bands.

For this reason, the GFJ series ventilation duct eliminators and drum induced draft fan eliminators are both impedance sound flow type, using a resistive structure that absorbs and suppresses high and low frequency noise, as well as an impedance structure that suppresses and reduces low and high frequency noise. At the same time, two types of suction and noise reduction zones, high-frequency and low-frequency, are used in the resistive channel to maximize the broadening of the noise reduction frequency band and achieve good noise reduction results.

The GFJ series ventilation duct fan suppressor and drum induced draft fan silencer are suitable for various centrifugal, axial, Roots fans, and air compressors.

2. Application and production of impedance acoustic flow type fan muffler (fan muffler):

Fans are a type of general mechanical equipment with a wide range of applications. The production of various industries such as power, mining, machinery, metallurgy, and chemical industry cannot be separated from fans. The noise generated by the operation of the fan has become a disaster that affects the health of workers and interferes with the environment- The aerodynamic noise emitted by the air inlet and outlet of fans, especially those in neighboring residential areas, is the main factor polluting the environment and causing public hazards. It has become one of the main targets of noise pollution in our industrial sector in recent years.

Industrial fans are equipment that operates continuously- The International Organization for Standardization (ISO) specifies a noise standard of ≤ 90 decibels for this type of equipment. My standard is the same, which is also the basis for industrial enterprises to continuously meet noise standards. However, without using noise reduction measures, the noise emitted from the fan inlet and outlet into the environment can reach 110-120 decibels, greatly exceeding the standard requirements.

The Roots blower muffler is divided into:

Centrifugal fan silencer, Roots fan silencer, blower silencer, axial flow fan silencer. Fan eliminators are mainly used to reduce the aerodynamic noise of various fan air outlets, air ducts, and enclosed machine room air intakes.

According to the different inlet and outlet structures of Roots fans, they are divided into circular structures and rectangular structures.

(1) The circular junction is used for Roots blower nozzles, which are circular and can be divided into two types: A and B. Both ends of Type A are flange plates, directly connected to the pipeline (i.e. pipeline silencer). The B end is a flange, and the other end is directly vented to the atmosphere (rainproof hood can be installed). It is only suitable for outdoor pipeline ends and enclosed machine room air intakes.

(2) The resistance type sound-absorbing plate with a circular structure has a general thickness of 100 mm, 150 mm, and a sound-absorbing capacity of 15-30 dB (A). Under the condition of wind speed of 5-12 m/s, the applicable air volume is 1000-5000 m3/h. The conclusion is to use impedance two types of noise reduction zones for high-frequency and low-frequency noise reduction, in order to maximize the broadening of the noise reduction frequency band.

Therefore, when ordering Roots blower silencers, please provide the following information:

1) Roots blower model and usage scenarios; 2) Roots blower air volume and wind speed; 3) Size of the nozzle

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