Cooling fan failure reason

　　Product design and manufacturing

　　1, the intensity of the design does not take full account of the dynamic load. Design unfair.

　　2, aerodynamic design perfect. On the aerodynamic characteristics of the expansion is unknown.

　　3, blade material difference. Blade strength safety factor is not enough.

　　4, forged blade poor quality.

　　5, welding, assembly quality is poor. A blade bolt broke off blades.

　　6, poor quality control petrol stations.

　　7, monitoring, protection accessories failure.

　　Installation

　　1, resulting in fan vibration, bearings, couplings easily damaged. Shaft imbalance or bad connection.

　　2, indicating the value of the control room on the spot feedback inconsistent actuator mounting error is large. Resulting in incorrect manipulation.

　　Fan selection and system design cooling fan

　　Fans pipeline system characteristics and unfair, improper selection of the fan blower actual operating point without chaos airflow area or close to even enter the stall area. Fatigue can be caused by damage to the turbine rotor and related components.

　　Operation, inspection of

　　1, the air pressure pulsation amplitude increased significantly, axial fan stall long-term work in the premise. Resonance damaged blade

　　2, do not follow the requirements of the fan characteristics and start the car,

　　3, do not vote or ESP ESP due to the low efficiency of the fan import high dust concentration.

　　4, large differences between the two operating points. Two fans running in parallel.

　　5, axial fans surge protection failure.

　　6, no scheduled inspection or test is bad.