Measures to improve the seismic and wear resistance of centrifugal fans
The damper of a centrifugal fan is mainly used to reduce the vibration of the fan, but this vibration sometimes does not come from the centrifugal fan. Because the centrifugal fan has undergone a vibration test before leaving the factory. It can only leave the factory and be sent to customers after passing the vibration test.
However, during the actual installation process, the centrifugal fan may vibrate. For example, if the installation base is not flat, the centrifugal fan may vibrate; because it is a high-power centrifugal fan, once vibration occurs, it will cause a chain reaction.
In mild cases, the pipeline will resonate and damage the pipeline, and in severe cases, the centrifugal fan will be damaged. At this time, the damper comes into play, and the damper can effectively reduce the vibration of the centrifugal fan. Reduce the occurrence of resonance. The damper is an auxiliary tool to protect the centrifugal fan and the pipeline. Therefore, large centrifugal fans are often equipped with dampers when leaving the factory.
The wear of centrifugal fans includes fatigue wear, erosion wear, abrasive wear and adsorption wear. Fatigue wear is caused by surface fatigue stress, which causes cracks or peeling on the surface, which is called fatigue wear. From the perspective of the damaged impeller, the conditions and locations of various forms of impeller wear are not the same. However, the wear forms are mainly the above types, all of which are local wear.
The wear parts of centrifugal fans are mainly located near the blade working surface and the rear disc. Various other types of wear are caused by the intake conditions. With the improvement of material wear resistance or surface treatment, it is an effective measure to measure wear resistance, but the cost and process requirements are also increased accordingly.
Starting from the movement law of gas-solid two-phase flow, analyzing the movement and wear mechanism of particles, and changing the movement trajectory of particles in the fan from an aerodynamic perspective is a way to improve impeller wear from a design perspective. The gas-solid two-phase flow in the experimental stainless steel fan was analyzed and calculated, focusing on the effect of changing the impeller inlet conditions on the movement of particles in the fan and the wear of the impeller.
The calculation and analysis show that the correct change of the air intake conditions of the centrifugal fan impeller can improve the wear of the impeller to a certain extent and improve the wear resistance of the centrifugal fan without affecting the aerodynamic performance of the fan.
