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 (pressure). 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. The processing equipment and technology level are also relatively backward. The processing accuracy is low. 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.
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.
Centrifugal fans are a universal device. Our great ancestors started using this device long, long ago. The centrifugal fan we use today is actually an improved device of the previous fan. In the past, our ancestors did not have today's advanced industrial level. Many parts are made of wood, which made the power of the previous fan too low, and it could not play the main function of the fan at all. A centrifugal fan is a machine that relies on the input of mechanical energy to increase the pressure of the gas and exhaust the gas. The centrifugal fan is also a driven fluid machine. Centrifugal fans are widely used in ventilation, dust extraction and cooling of factories, mines, tunnels, vehicles and buildings; ventilation and induction of boilers and industrial furnaces; and cooling and ventilation in indoor air-conditioning equipment and household appliances; grain Drying and delivery.
The development direction of foreign centrifugal fans is large-capacity, high-pressure, compact structure, low energy consumption, low noise, high efficiency, good plasticity, strong exhaust purification ability; generally skid-mounted without foundation, full-cover low-noise design, which greatly saves Installation, foundation, and commissioning costs; continuous development of new gas valves that operate under variable operating conditions, greatly improving valve life; in product design, the application of centrifugal fan thermodynamics, dynamics calculation software and its working process simulation software, etc., to improve Calculate the accuracy, and predict the performance parameters of the machine under actual working conditions through a comprehensive simulation model to improve the success rate of new product development and strengthen mechatronics. Compared with this foreign high-tech fan, it is clear that we have many shortcomings.
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