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.
China's centrifugal fan machinery industry has many long-term good innate favorable conditions, the market potential is quite large, and the development prospect is extremely broad. From an international perspective, peaceful development cooperation is the mainstream of the times. The overall international environment is conducive to China's peaceful development and construction. The international market has a relatively large demand for Chinese centrifugal fan products. From a domestic perspective, the in-depth development of internationalization such as urbanization, industrialization, marketization, and informatization, and the rapid growth of economic structural transformation, especially China is currently in the process of expanding domestic demand and accelerating infrastructure construction and industrial transformation and upgrading. At this stage, there is a very large market demand for advanced fan mechanical equipment. From the point of view of the industry itself, although China has become a large country in the manufacture of wind turbine machinery, it is not a series of problems in which it is not a strong country, its independent innovation capability is still relatively weak, and its basic manufacturing level is not high. However, the whole industry is accelerating the pace of transformation and upgrading with a brand-new attitude. It is believed that the centrifugal fan industry will flourish and develop vigorously.
Centrifugal fans are auxiliary production equipment commonly used in stone processing enterprises. They are mainly used in ventilation and dust removal devices, such as cyclones and bag dusters in the stone cutting and grinding processes. All need to use centrifugal fans to remove dust from the production site to ensure that The production environment is clean and protects the physical and mental health of producers. Fan is a kind of equipment with high energy consumption, and the power resource of consumption fan is larger in stone processing. With the current shortage of energy in China and the popularization and application of high-yield and high-efficiency working surfaces, energy conservation and consumption reduction have become a common concern of stone manufacturing enterprises. Many stone manufacturing enterprises take reducing power consumption of fans as an important task at present. In addition to reducing the power consumption of the fan, in addition to improving the efficiency of the fan itself, it is most important to use a reasonable adjustment method for the fan.
At present, centrifugal fans belong to general machinery, and there are many downstream demand industries, including petroleum, electric power, chemical industry, textile, rail transportation industry and so on. Most of these downstream industries are in a period of rapid development, with increased investment in fixed assets and faster equipment upgrades, which have brought a lot of room for development in the wind turbine industry. The data shows that in recent years, the sales revenue of China's fan industry has increased year by year. In 2013, the industry sales revenue reached 80.873 billion yuan, an increase of 8.83% year-on-year, indicating that China's centrifugal fan industry demand market is relatively strong. The centrifugal fan is designed using the principles of physical kinetic energy conversion and energy conservation. Is a kind of high-tech products.
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