Centrifugal fan is based on kinetic energy conversion to the principle of potential energy, the use of high-speed rotating impeller to accelerate the gas, then deceleration, Centrifugal Fan change the flow, so that kinetic energy into potential energy (pressure). In a single-stage centrifugal fan, Centrifugal Fan the gas enters the impeller from the axial direction, and the gas flows through the impeller into a radial direction and then into the diffuser.
In the diffuser, the gas changes the flow direction and causes the deceleration, which converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller, Centrifugal Fan secondly occurs in the expansion process. In multi-stage centrifugal fan, the flow of air into the next impeller with a backflow, resulting in higher pressure.
Centrifugal fan working principle and turbine compressor are basically the same, because the gas flow rate is low, the pressure changes little, Centrifugal Fan generally do not need to consider the gas ratio changes, that is, the gas as incompressible fluid treatment.
The centrifugal fan can be made into two types-right and left. Centrifugal Fan From the side of the motor face, impeller clockwise rotation, known as the right rotating fan, impeller counterclockwise rotation, known as the left rotating fan.
Roots fan for the volumetric type fan, Centrifugal Fan the transmission of the air volume and the number of turns, the impeller end and the fan front and rear end cover between the fan impeller and always maintain a small gap, in the synchronous gear driven downwind from the fan inlet along the shell wall to the side of the discharge.
Centrifugal fans are mechanically driven by input mechanical energy, which increases the gas pressure by sending gas by side. Centrifugal fans are widely used in factories, mines, tunnels, cooling towers, vehicles, Centrifugal Fan ships and buildings ventilation, dust and cooling, Centrifugal Fan boilers and industrial furnaces ventilation and draught;
Sewage treatment fan-roots blower, if the load is the constant flow effect of the situation when the use of roots blowers. Because the roots blower belongs to the constant flow fan, the work main parameter is the air volume, the output pressure changes with the pipeline and the load change, Centrifugal Fan the wind volume change is very small. The roots blower is a kind of high pressure blower, the roots blowers are the volumetric fan, and the air flow rate is proportional to the transfer quantity, the gas is transported by the suction side to the side of the discharge.
Sewage treatment fan-centrifugal fan If the load is the constant pressure effect of the situation when the use of centrifugal fan. Because the centrifugal fan belongs to the constant pressure fan, the main parameter of the work is the wind pressure, the output air volume changes with the pipeline and the load change, Centrifugal Fan the wind pressure change is not big. Centrifugal fan, the wind pressure is not big. The compression process of air is usually carried out under the action of centrifugal force by several working impellers. Centrifugal Fan The centrifugal blower belongs to the square torque characteristic, Centrifugal Fan and the roots blower is basically the constant torque characteristic.
Sewage treatment fan-rotary fan, roots blower general air volume ratio is larger, pressure is relatively large, the same roots blower noise is very large, if the need for small air volume, Centrifugal Fan the noise requirements are relatively high, the choice of rotary blower, Centrifugal Fan rotary blower is also a constant flow fan, the main parameter of the work is the air volume, Centrifugal Fan the output pressure changes with the pipeline and the load change, the air volume change is very small, the rotary fan is the variable volume compression, its main characteristic is: Low speed, Centrifugal Fan low noise, low vibration, high efficiency, energy saving.