Principles and Types of Wear in Small Stainless Steel Fan Impellers

Principles and Types of Wear in Small Stainless Steel Fan Impellers

Principles of Wear in Small Stainless Steel Fans: There are many causes of wear in small stainless steel fans, but most result from the combined effects of multiple mechanisms. Typical forms of wear include erosion and abrasion. After entering the impeller, solid particles interact with the walls. In the flow passage and the inlet region of the entire axial flow channel, solid particles collide with the walls at a non-zero angle of attack and rebound back into the flow channel. The resulting wear on the wall material is typical erosive wear. However, in the outlet region of the centrifugal impeller, dust particles travel long distances within the impeller; most collide with the walls multiple times, essentially sliding or rolling along the pressure surface while exerting a certain amount of pressure. The resulting wear on the lining material is caused by the cutting action of the dust particles. If dust particles concentrate near the pressure surface, the risk of wear caused by these particles increases. The types of wear are as follows. In small stainless steel fans, relative motion between solid particles and the surface of the impeller at specific speeds causes wear. Due to the filling effect of relative motion or grinding action, solid particles and debris dispersed at the interface cause contact surface wear and impeller wear. Degree of impact 2. Adhesive wear Under otherwise identical conditions, even if machining precision and surface cleanliness are improved to enhance compatibility, wear on small stainless steel fans will not decrease. On the contrary, because the interfaces are very close, the molecular adsorption effect is significant, and interface wear—known as adhesive wear—increases. 3. Abrasive Wear Surface wear caused by solid particles washing over the metal surface is called abrasive wear. 4 Fatigue Wear Surface cracks and flaking of the coating caused by surface fatigue stress (or temperature or impact) are referred to as fatigue wear. From the perspective of damage to small stainless steel fan impellers, the wear conditions vary among different impellers and components; the primary wear patterns are as follows. All of the above are forms of localized wear, with the worn parts primarily located on the working surfaces of the blades and near the backing plates.