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Centrifugal fans are used as auxiliary fan equipment for many production equipment.
It is widely used in various production machines, but why does the centrifugal fan sometimes vibrate greatly?
There are many reasons why centrifugal fans vibrate.
Today, the editor will briefly understand with you in the following 5 aspects:
1. Reasons for the manufacture of centrifugal fans
The fan manufacturer's quality requirements for the fan also affect the operation of the fan.
If the parts are poorly processed and the precision is not enough;
The parts are of poor material, insufficient strength, and manufacturing defects; the dynamic balance of the rotor does not meet the technical requirements, etc.
2. Design reasons for centrifugal fans
The design of the fan is generally designed according to the use environment, temperature, air volume, air pressure, medium, etc. of the fan.
However, some companies do not choose models based on these factors, resulting in the following factors:
Improper fan design, poor dynamic characteristics, vibration during operation; unreasonable structure, stress concentration;
The design working speed is close to or falls into the critical speed area;
Inaccurate calculation of thermal expansion, resulting in poor thermal alignment, etc.
3. Reasons for the operation of centrifugal fans
During the use of the fan, the maintenance of the fan and the quality of the maintenance play a decisive role in the operation quality of the extractor fan.
If the process parameters (such as the temperature, pressure, flow, load, etc. of the medium) deviate from the design values,
The operating conditions of the machine are abnormal; the machine runs under over-speed and overload, which changes the working characteristics of the machine;
Poor lubrication or cooling;
Partial damage or scaling of the rotor;
Improper operation of start-stop or acceleration/deceleration process, uneven thermal expansion or excessive stay in the critical area, etc.
4. Reasons for installation and maintenance of centrifugal fans
The installation accuracy of the fan plays a crucial role in the operation of the fan. If the installation accuracy does not meet the installation requirements, it will have a damaging effect on the operation of the fan.
In the process of induced draft fan , there are the following influencing factors, if the mechanical installation is improper, the parts are dislocated, and the preload is large;
Poor shaft alignment, improper adjustment of machine geometric parameters (such as fit clearance, interference and relative position);
Improper placement of the rotor for a long time, changing the dynamic balance accuracy;
Failure to overhaul in accordance with the regulations will destroy the original matching properties and accuracy of the machine.
5. Reasons for deterioration of centrifugal fan machines
General equipment has a certain number of years in use, and the performance of the equipment will deteriorate after a certain number of years.
The same is true for fans. If the rotor runs for a long time, the deflection of the rotor increases or the dynamic balance deteriorates; the rotor is partially damaged, falls off or cracks; parts are worn, pitted or corroded; the force on the mating surface is deteriorated, resulting in insufficient interference or Looseness, etc., destroy the matching properties and accuracy; uneven settlement of the machine foundation, deformation of the machine shell, etc.
