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Performance characteristics and Future Development of centrifugal Fan

Dec 13, 2018

With the progress of industrialization in our country, the industrial industry is carrying out energy saving and consumption reduction, upgrading and reorganizing the industry, and the industrial infrastructure needs a lot of renewal. Centrifugal fans, as an important supporting equipment in industry, will be applied to electric power, cement, petrochemical, coal, mining and environmental protection. In the new economic development situation, the future centrifugal fan industry will continue to maintain faster growth.


Performance characteristics of centrifugal Fan

Centrifugal fan is essentially a variable flow constant pressure device. When the speed is fixed, the theoretical curve of pressure-flow of centrifugal fan should be a straight line. Due to internal loss, the actual characteristic curve is curved. The pressure produced in centrifugal fan is greatly affected by the change of inlet air temperature or density. For a given intake, the pressure generated at the highest inlet temperature (the lowest air density) is the lowest. For a given pressure and flow characteristic curve, there is a power and flow characteristic curve. When the blower is running at constant speed, the required power increases with the decrease of inlet temperature for a given flow rate.



Working principle of centrifugal Fan

According to the principle that kinetic energy is converted into potential energy, centrifugal fan accelerates gas by using high speed rotating impeller, then slows down, changes the direction of flow and converts kinetic energy into potential energy (pressure). In the single stage centrifugal fan, the gas enters the impeller from the axial direction and changes into the radial direction when the gas flows through the impeller, then enters the diffuser. In the diffuser, the gas changes the flow direction and the area of the pipeline section increases to slow down the airflow, which converts the kinetic energy into the pressure energy. The pressure increase occurred mainly in the impeller, and then in the spreading process. In the multi-stage centrifugal fan, the air flow enters the next impeller with a backflow device, resulting in higher pressure.http://jnblower.com/