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Summarize the FFU fan failure and reasons, there are usually five reasons as below.
The first season is FFU fan design reasons.
FFU fan are improperly designed, and poor dynamic characteristics, forced vibration or self-excited vibration occurs during operation. 1, unreasonable structure, stress concentration.
2, design working speed close to or fall into the critical speed zone.
3, the amount of thermal expansion is not calculated, resulting in poor thermal state alignment.
Second reason is manufacturing reason.
Poor processing and manufacturing of parts and components, insufficient precision.
Bad material of parts, insufficient strength, manufacturing defects.
Rotor dynamic balance does not meet the technical requirements.
Third reason is the installation, and maintenance reasons.
FFU fan improper mechanical installation, parts misalignment, pre-load.
Poor alignment of the shaft system.
Machine geometric parameters (such as fit clearance, interference and relative position) improperly adjusted.
Large pipe stress, the machine in working condition changes the dynamic characteristics and installation accuracy.
The rotor is not placed properly for a long time, which changes the dynamic balance accuracy.
Not in accordance with the rules of maintenance, destroyed the original nature and accuracy of the machine with.
Fourth reason is the operation operation reasons
Process parameters (such as medium temperature, pressure, flow, load, etc.) deviate from the design value, the machine operating conditions are not normal.
Machine in the super speed, overload operation, changing the working characteristics of the machine.
The fifth reason is the causes of machine deterioration.
Long-term operation, increased rotor deflection or dynamic balance deterioration.
The rotor is partially damaged, dislodged or cracked.
