Front and rear double silencing structure

The FBD series low-noise front and rear double silencing structure is based on the conventional basis of the FBD series explosion-proof pressure-in counter-rotating axial flow local ventilation fan, and an inlet silencer is added to realize the inlet and outlet double silencing structure. The fan consists of a collector, an inlet silencer, a primary host, a secondary host, an outlet silencer diffuser, and an explosion-proof motor; this ventilation fan has the characteristics of large flow rate, high wind pressure, high efficiency, and low noise. It has excellent design, advanced technology, energy saving, low noise, serialization, simple structure, convenient maintenance, and strong applicability.

Environmentally friendly, convenient and detachable low-noise axial flow local ventilation fan structure

Considering that the environmentally friendly FBD low-noise axial flow local ventilation fan operates in an environment with a lot of coal dust or dust for a long time, after a long period of operation, there will be a large amount of dust or coal ash inside the sound insulation layer. A large amount of dust or coal ash adhering to the sound insulation material will greatly reduce the noise reduction effect, and the original structure is difficult to clean. Therefore, our company has developed a new convenient and detachable hexagonal environmentally friendly FBD low-noise axial flow local ventilation fan structure;

This structure adopts a three-dimensional hexagonal structure, uses automated folding technology, and independent design methods, making it convenient for users to replace sound-absorbing materials later; this structure is simple to disassemble and easy to install, which can meet the user's requirements for fan noise reduction, and overcomes the problem of cleaning and replacing the noise reduction material later, which is convenient and practical, and saves costs.

Environmentally friendly low-noise local ventilation fan structure

The environmentally friendly FBD explosion-proof axial flow local ventilation fan reduces the noise of various frequencies to below 85 to 80 decibels, protecting the physical and mental health of workers, improving the underground working environment, and achieving environmentally friendly mine ventilation.
The environmentally friendly local fan is a new product improved and designed based on the side-inlet low-noise local fan. The noise is lower than 80 decibels. The noise reduction measures adopted by the low-noise environmentally friendly local fan are based on the principle of noise generation and propagation, changing the air intake direction, optimizing the structural design, and better absorbing low- and mid-frequency noise and effectively isolating high-frequency noise, so that the overall noise of the fan is eliminated and attenuated. The modular design composed of various sound-absorbing components can provide users with better selection, transformation, and solutions.

Environmentally friendly FBD low-noise axial flow local ventilation fan

Local ventilation fans for coal mines are essential ventilation equipment in the mining and excavation production process, especially the FBD series of explosion-proof pressure-in counter-rotating axial flow local ventilation fans, which are not only widely used in the pressure-in long-distance ventilation of large and small cross-section roadways in coal mine underground mining, but also in metallurgy, petrochemicals, power, railways, highway tunnels and other industrial fields for ventilation and ventilation. This series of ventilation fans is a ventilation fan for excavation construction that is reasonably matched with the ventilation parameters of coal mine roadways. This series of fans has the characteristics of large flow rate, high wind pressure, and high efficiency. However, during the operation of the ventilation fan, harsh aerodynamic noise and mechanical noise will be generated, which has affected the physical and mental health of the staff in the mining production process. At present, most of the commonly used local fans use double-layer shells filled with sound-absorbing materials to reduce noise, but the overall radiated noise of the fan during operation is greater than 100dB(A), which cannot meet the customer's requirements for low noise.

To this end, our company has developed low-noise and ultra-low-noise environmentally friendly ventilation fans, which reduce the noise of various frequencies of the fan to below 85 to 80 decibels, protecting the physical and mental health of on-site personnel, improving the underground working environment in the mine, and achieving environmentally friendly air supply. We adopt multiple noise reduction measures. According to the aerodynamic principle of the fan and the principle of noise generation and propagation, we have added a streamlined air intake silencer and an inlet and outlet composite silencer, optimized the structural design of the fan host, and added high-quality sound-absorbing materials to better absorb low- and mid-frequency noise and effectively isolate high-frequency noise, so that the overall noise of the fan is eliminated and attenuated.

Introduction to the patent for low-noise counter-rotating axial flow ventilation fan