The ventilator 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 fan, the gas enters the impeller from the axial direction. When the gas flows 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 ventilator, a return flow is used to direct the airflow into the next impeller, creating a higher pressure. Our 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 level of processing equipment and technology is 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.
The centrifugal fan is mainly composed of an impeller and a casing. The impeller of a small fan is directly mounted on the motor, and the large fan is connected to the motor through a coupling or a pulley. Centrifugal fans are generally single-sided air intake, using single-stage impellers; large flow can be double-sided air intake, using two back-to-back impellers, also known as double-suction centrifugal fans. The impeller is the main component of the fan. Its geometry, size, number of blades and manufacturing accuracy have a great impact on performance. The impeller must be corrected by static balance or dynamic balance to ensure the fan to rotate smoothly. According to the direction of the blade exit, the impeller is divided into three types: forward, radial and backward.
Ventilator is a general term for machinery for exhausting gas. According to its exhaust pressure, it is divided into fan, blower and turbine compressor. The so-called small and medium-sized enterprises in the fan industry mainly refer to enterprises that produce various types of fan products. The characteristics of fan products are large volume and wide area, the structure of the product is not very complicated, and the manufacturing accuracy requirements are not very high, but it accounts for about 96% of the total number of fans in the fan industry. To this end, establishing the development direction of SMEs in the fan industry and promoting the rapid development of SMEs in the fan industry are of practical significance and involve the long-term interests of the fan industry. Both skilled workers and engineering technicians need to constantly update their knowledge. At present, the engineering and technical personnel of most small and medium-sized wind turbine companies have very few formal wind turbine graduates. They urgently need professional training. Qualified enterprises can choose to send some technical personnel to their counterparts for further studies.
Fans are widely used in various industrial sectors. Generally speaking, centrifugal fans are suitable for small flow and high pressure places, while axial flow fans are often used for large flow and low pressure. With the continuous development of science and technology, people have higher and higher requirements for the use of fans. As far as the current development trend of foreign fan technology, it will follow the direction of increasing fan capacity, high efficiency, high speed miniaturization and low noise development of. Boiler fan can choose centrifugal or axial flow according to the specifications of the boiler. According to its function, it is divided into boiler ventilator-to send air to the boiler; boiler induced draft fan-to extract the flue gas from the boiler.
Address: Shuangmiao, Luoshe Town, Huishan District, Wuxi City (160 kilometers south of 312 National Road 200 meters ahead)