Factors Affecting Wear in 9-19 High-Pressure Centrifugal Fans

Factors Affecting Wear in 9-19 High-Pressure Centrifugal Fans

The operating principle of the 9-19 high-pressure centrifugal fan is essentially the same as that of a turbo compressor; however, due to the low gas flow rate and minimal pressure changes, variations in specific volume generally do not need to be considered. The gas is treated as an incompressible fluid. Please share the factors that affect wear in centrifugal fans. 1. The shape of the impeller blades significantly affects the degree of wear. Generally, single-inlet fans exhibit better wear resistance than axial fans, backward-curved fans, and forward-curved 9-19 high-pressure centrifugal fans. They feature a low pressure coefficient, large blade diameter, and high peripheral speed. 2. Propeller material—the wear resistance of the propeller is closely related to the hardness of the material. Generally, the higher the hardness of the impeller material, the greater its impact resistance and wear resistance. However, the wear resistance of the impeller depends not only on the hardness of the material but also on its composition. 3. Hardness of Dust Particles in the Gas Stream of 9-19 High-Pressure Centrifugal Fans—Wear caused by dust particles on metal surfaces results from the impact and scratching of these particles. This occurs when dust particles are pressed into the metal, creating plastic indentations, and when a continuous stream of dust particles gradually forms a thin layer of plastic deformation. If the load from the dust particles exceeds the yield strength of this plastic deformation layer, the surface layer will be damaged and worn away. When the hardness of dust particles exceeds that of the fan duct components, the particles will collide with the duct walls or cause wear to facilitate their detachment. Consequently, higher dust particle hardness accelerates wear on the duct walls of the centrifugal fan. Dust concentration and gas velocity—impeller wear is directly proportional to the dust concentration in the gas. The higher the dust concentration, the greater the number and frequency of solid particles colliding with the impeller blades and walls per unit time, resulting in more severe wear on the impeller blades of the 9-19 high-pressure centrifugal fan. Impeller wear is proportional to the square of the gas velocity. The faster the velocity, the greater the centrifugal force and kinetic energy of the dust particles, the greater the impact on the impeller, and the more severe the wear.