Introduction to Measures for Addressing Impeller Wear in Portable Axial Flow Fans

Introduction to Measures for Addressing Impeller Wear in Portable Axial Flow Fans

There are many causes of impeller wear in portable axial flow fans, most of which result from a combination of factors that affect the overall performance of the fan. Therefore, it is essential to implement measures to address impeller wear. Based on the various forms of wear, wear-resistant measures can be categorized as follows. 1. Blade Surface Treatment. The surfaces of portable axial flow fan blades can be treated through carburizing, plasma surface treatment, super-hard alloy spraying, or ceramic coating. The common advantage of these methods is that they increase the hardness of the blade surface, thereby improving the blades’ wear resistance to a certain extent; however, each method has its own drawbacks. The carburizing process is particularly challenging. In actual carburizing, the location and thickness of the carburized layer depend on the blade’s thickness, the extent of wear, and the carburizing process. Blades undergo significant deformation during surface treatment; repeated welding can cause cracks on the blade surface, which may easily lead to accidents. It is difficult to determine the thickness of the coating during spraying. Applying ceramic plates is highly effective but very expensive. 2. Spraying wear-resistant coatings onto the surface of the movable axial flow fan blades. This method is simple to implement and low-cost, but the coating wears down quickly, lasting only 3 to 5 months per application. 3. Improving the blade structure. The working surface of the portable axial fan is machined into a serrated pattern; hollow blades are modified to solid blades; and wear blocks are welded onto the cutting edges, which can reduce propeller wear to a certain extent. 4. Front-side wear-resistant measures. By installing wear-resistant cascades on the high-wear areas of the portable axial flow fan, the flow of particles toward the rear disc and the blade roots is prevented, transforming concentrated particle wear into uniform wear, thereby improving wear resistance and extending the service life of the propeller and fan. 5. Improved Aerodynamic Design. By carefully selecting the inlet shape of the portable axial-flow fan, ensuring a low relative velocity at the propeller inlet, minimizing the rotational speed of the fan as much as possible, and choosing an appropriate propeller profile with a gradually increasing curvature radius from the inlet to the outlet, collisions between solid particles and the blades can be reduced.