For the needs of relatively high static pressure, the use of centrifugal fans is a correct choice, it is suitable for long wall working surfaces. The length and strike dimensions of the longwall face in the United States have increased to a particularly large extent. Even air currents pass through the goafs using the big fallout method. Of course, the goaf has a high coefficient of friction. The main fans of coal mines in the United States are mainly axial fans. To meet the ventilation needs, they must generate very high static pressure. In some coal mines, the main fan is mainly an axial fan. In order to meet the ventilation requirements, a very high static pressure must be generated. Some coal mines have tried high-speed axial fans. Practice has shown that axial flow fans are noisy and unstable; the most common failures are damage to fan blades and bearings. In spite of these problems, methane gas released from the working face and the goaf must be discharged. Because of the long ventilation distance and limited static pressure, it is clear that this is a difficult task for the main fan of the mine.
The centrifugal fan is based on the principle of converting kinetic energy into potential energy, using a high-speed rotating impeller to accelerate the gas, then decelerating and changing the flow direction, so that the kinetic energy is converted into potential energy. In a single-stage centrifugal fan, the gas enters the impeller from the axial direction. When the gas passes through the impeller, it changes to the light direction and then enters the diffuser. In a diffuser, the gas changes its flow direction and causes a deceleration. This deceleration converts kinetic energy into pressure energy. The increase in pressure occurs mainly in the impeller, followed by the pressure expansion process. In a multi-stage centrifugal fan, a return flow is used to make the air flow into the next impeller, which produces higher pressure. Our centrifugal fans are relatively backward in design theory and design methods. Many product developments use imitation and analog methods. There is a serious lack of theoretical basis and experimental research data. Processing equipment and technology levels are also relatively backward. Production efficiency is low, product serialization and generalization are not high, specifications are small, there are still very large gaps in pump efficiency, quality and reliability, sealing performance and corrosion resistance.
The development potential of China's centrifugal fan industry is huge. Enterprises have continued to improve their production and product design technologies. In recent years, they have also made greater strides in automation to increase efficiency and competitiveness. In various fields such as factories, mines, and housing, higher requirements are imposed on the fan industry. For example, large-scale infrastructure projects now use less domestic equipment for fans. Facing such a situation, China's wind turbine industry should calmly, calmly, and actively respond to meet the needs of the industry to the maximum, so that the domestic wind turbine industry can develop better in the future. China's economy is now in the process of transition. New technologies have yet to find a breakthrough point. Under this situation, the wind turbine industry is facing the pressure of industrial rebalancing and structural transformation. In response to the above problems, China's fan industry must attach great importance and take effective measures to solve it, so as to promote the steady development of the fan industry.
Some time ago, the slow growth of the manufacturing industry was an important reason for the weak growth of the centrifugal fan market. In the fourth quarter of the year, the output value of the manufacturing industry of the wind turbine market experienced the highest decline since the first quarter of 2009, and manufacturing industries in Asia and other regions showed a lack of filling. In Mainland China and Hong Kong, growth is slow, while Singapore is in place, but India ’s manufacturing production has indeed expanded substantially, and its related index is still at a relatively low historical level. In comparison, Russia and Turkey's manufacturing production activities have achieved rapid growth, and Turkey's growth rate has reached a new high in three quarters.
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