High-speed rotation and development requirements of clean room blower fan

- Apr 25, 2018-

In the process of operation, the clean room blower fan operates in a similar manner to the ventilator. In the operation process, only the air compression process is usually performed by several working impellers under the action of centrifugal force, and the blower is to a certain extent. There will be a rotor rotating at a high speed. The blades on the rotor will drive the air to move at a high speed. The centrifugal force will make the air flow in the involute-shaped casing and flow along the involute to the outlet of the fan. The high-speed airflow will have a certain wind pressure. The new air enters the center of the housing and is replenished.

The clean room blower will effectively drive its impeller to rotate at a high speed through a shaft to a certain extent. In the process of operation, its air flow directly enters its high-speed rotating impeller from the inlet axis and becomes effective as the radial flow is accelerated. , and then enter the diffuser chamber, change the direction of the flow and decelerate, this deceleration effect will convert the kinetic energy of the high-speed rotating airflow into pressure energy (potential energy), so that the fan outlet maintains a stable pressure.

The clean room blower fan is a straight line whose pressure and flow characteristic curve is to a certain extent. During the operation, due to the frictional resistance and other losses in the blower, the actual pressure and flow characteristic curve decreases smoothly with the increase of flow, corresponding to The power-flow curve of the centrifugal fan rises as the flow rate increases.

Clean room blower When the fan runs at a constant speed, the operating point of the fan will move along the characteristic curve of its pressure and flow rate. During the running process, the working point of the fan when it is running depends not only on its own Performance, and depending on the characteristics of the system, the pipe performance curve will become steeper as the pipe network resistance increases. The basic principle of fan regulation is to change the performance curve of the fan itself or the characteristics of the external pipe network to obtain the required working conditions.

Now, with the continuous development of its technology, the AC motor speed control technology of the clean room blower fan is widely used. It can effectively pass a new generation of fully-controlled electronic components to a certain extent, and its inverter is used in the production process. The speed of the AC motor is used to control the flow of the fan, which can greatly reduce the energy loss caused by the mechanical control of the flow in the past.