Axial flow fan silencer

Introduction to axial flow fan muffler:

Axial flow fan muffler is mainly used to reduce the noise of axial fans, usually with a circular structure, divided into single cavity structure and double cavity structure. The sound attenuation of ZFD single cavity type is 15-20dB (A), and that of ZFS double cavity type is 20-25dB (A). The cross-sectional dimensions are all made according to the universal standard air duct, and the micro perforated plate is made of stainless steel plate or aluminum plate.

Introduction to axial flow fan:

Axial flow fan refers to the airflow in the same direction as the axis of the fan blade (i.e., the direction of the wind is parallel to the axis), such as an electric fan and an external fan of an air conditioner, which operates in an axial flow mode.

Axial flow fan, also known as local ventilation fan, is a type of fan used in industrial and mining enterprises. It is different from ordinary fans. Its motor and blades are all in a cylinder, with a cylindrical shape. It is used for local ventilation, easy to install, clear ventilation results, and safe. It can be connected to an air duct to deliver the air to a designated area

Axial flow fan: Axial flow fan mainly consists of 1-wheel hub; 2- Blades; 3-axis; 4- Shell; 5- Air collector; 6-fluid; 7- Rectifier; 8-Diffuser. And composed of air inlet and impeller. The air inlet is composed of a collector and a flow body, and the impeller is composed of hub 1 and blade 2. The impeller and shaft 3 are fixed together to form the rotor of the ventilation fan, which is supported on bearings.

When the electric motor drives the impeller of the ventilation fan to rotate, relative airflow passes through each blade.

Scope of application of fan muffler: Fan muffler is mainly used for various series of high-pressure centrifugal fans to reduce aerodynamic noise at the inlet and outlet. Both ends of the FT type are flange connections that can be connected in series to the pipeline, and the other end is a rainproof cap, which is only suitable for outdoor pipeline ends and enclosed machine room air intakes.

The principle of the centrifugal fan muffler is developed based on the principle of soundproof sheet muffler. This type of muffler has good acoustic performance and good aerodynamic performance; Reasonable structure, easy to install, it is a high wind resistance honeycomb muffler, which adopts a chamber resistant adhesive straight pipe channel and a cross shaped sound-absorbing plate form, thereby ensuring sufficient noise reduction within a wide frequency band range. The FT type muffler structure is composed of several parallel unit muffler tubes arranged in a row, with holes filled with sound-absorbing materials between the muffler tubes. In order to reduce the radiation sound generated by airflow and shell wall vibration, reinforcement ribs are installed on the outer shell.

-The Type High Anti Spray Resistance Series Silencer Equipment is used in power generation, chemical, metallurgical, textile and other industrial plants and mines for various types of boilers and steam turbine exhaust; Fan; Noise reduction of safety doors and other equipment. This series of mufflers is developed based on the principle of composite noise reduction with resistance, spray, and resistance. It has the advantages of large noise reduction, small volume, light weight, and easy installation and repair.

Fan silencers are suitable for blower silencers used in ventilation ducts. Fans are a type of general mechanical equipment with a wide range of applications. Production in 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.

The fan muffler series produced by our company is a noise reduction device used to reduce the aerodynamic noise caused by fans to the environment. Used for noise reduction of various centrifugal and ventilation fan inlet and outlet ducts.

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 fan muffler, blower muffler, boiler induced draft fan muffler, and Roots fan muffler series are produced in impedance acoustic flow type. Our factory determines the frequency range in which a large amount of noise reduction is required as the main basis for designing sound absorption film structures and fluid channels based on the frequency data obtained from inter site testing of various types of wind turbines in the power plant. At the same time, narrow rectangular channels with large sound absorption material finishes are used to enhance absorption results. This product adopts a resistive structure that suppresses high and low frequency noise, as well as an impedance structure that suppresses low and high frequency noise. At the same time, high-frequency and low-frequency noise reduction zones are used in the resistive channel to maximize the bandwidth of noise reduction and achieve good noise reduction results. Fan silencers, fan silencers, boiler fan silencers, and boiler fan silencers, when installed according to user requirements, their noise limit will not exceed 80-90 decibels.

The forms of fan silencers, exhaust pipe silencers, and drum induced draft fan silencers all adopt the principle of resistance absorption noise reduction with good results for low frequency and pulsation, as well as micro perforated silencers and impedance composite silencers.

Barrier muffler is an absorption type muffler, which is generally divided into straight pipe, sheet, folded plate, honeycomb, acoustic flow, labyrinth, and elbow types according to the different structure of the airflow channel. A silencer is a device that utilizes sound waves transmitted through a porous sound-absorbing material to undergo friction and viscous resistance, converting sound energy into thermal energy for dissipation, thereby achieving the goal of noise reduction. It is a type of muffler that applies to all silencers.

The principle of anti muffler is different from that of anti muffler in terms of noise reduction. It cannot directly absorb sound energy, but instead uses the interface or adjacent resonant cavity on the pipeline to reflect and interfere with certain frequency sound waves transmitted along the pipeline at the interface, thereby achieving the purpose of noise reduction. It is divided into expansion chamber type mufflers and resonance type mufflers.

In the field of international noise control engineering, noise is dominated by broadband, and the combination of resistance absorption noise reduction and anti noise reduction is used to control high-intensity broadband noise.

Specification and model