For the cyclone, especially at high pressure and small flow, the blade stall is undoubted. At the same time, the installation angle of the second stage blade is relatively small. When the first stage stalls, the second stage does not stall, and the aerodynamic force is still relatively large. Under the action of the upstream unsteady flow, a large impact load is formed, resulting in the second. The blade is fatigue-damaged or directly destroyed, and the second-stage blade has a small chord length (less than the tip) and is relatively thin (bending plate, relative thickness less than 2%), which easily breaks the blade. Therefore, the KDZ fan now uses twisted airfoil-shaped hollow blades, which have better aerodynamic performance and strength than arc-shaped plate-shaped blades. Increasing the dynamic strength reserve of the blade is critical to the selection of the number of blades of the cyclone. Try to avoid the vibration of the blade caused by the superposition of the turbulent flow of the front and rear stages of the blade. The number of blades in the front and rear stages is preferably a prime number to change the frequency of the excitation force. . At the same time, the axial clearance of the cyclone is the geometric condition to ensure the best coordination of the two-stage bucket. Due to the influence of the wake, the velocity of the airflow from the blades of the preceding stage is not uniform, which will affect the operation of the latter blades and the aerodynamic performance of the entire fan, and cause the vibration of the blades. Therefore, in order to ensure that the airflow entering the subsequent stage blades tends to be uniform while reducing the aerodynamic noise, the optimum axial clearance between the two-stage impeller blades is D = 0.5b (b is the primary blade chord length). The friction pair of the fan impeller is matched by special materials. At present, the material of the impeller-extracting local ventilator impeller is mostly cast aluminum alloy. It is easy to cause sparks due to impact or friction, so it is easy to cause gas accidents in foreign countries. Light alloy materials are prohibited on the equipment. Explosive gases may be present in the environment used for mine extractable ventilators. For this reason, copper alloy impellers are used in the design of KDZ fans to prevent metal foreign objects sucked by the fans from hitting the blades or operating blades due to fan failure. The mechanical impact spark generated by the impact between the blade and the blade; at the same time, due to the small radial gap between the impeller blade and the casing, in order to prevent the fan from operating failure, the mechanical friction generated by the friction of the high-speed rotating impeller blade and the casing The spark causes the gas dust explosion. In addition to the copper alloy, the blade is inlaid with a copper ring on the circumference of the inner wall of the casing through which the blade rotates. This kind of impeller friction pair matched with special materials passed the 40 high-speed impact test and 23208 high-speed rotating friction test by the National Coal Mine Dust-proof and Ventilation Safety Product Quality Supervision and Inspection Center. No ignition test gas occurred (methane concentration 613%710). %, oxygen concentration 2415% 2515%) phenomenon. Conclusion The safe and reliable operation of the cyclone is not only related to the aerodynamic and structural design of the fan itself, but also closely related to the fan ventilation network of the fan. Therefore, it should be properly maintained in actual use, the motor bearing should be filled with high temperature resistant grease, and the inlet and outlet area of ​​the motor cooling air duct should be reasonable to ensure that the bearing temperature rise does not exceed 40e after the bearing thermal balance for 20 minutes, from the field use investigation. It is known that one of the main reasons for the burning of the motor is the poor quality of the bearing, the poor quality of the lubricating oil, the inability to withstand high temperatures, the burning of the bearing due to the high speed operation of the motor, and the burning of the motor shaft, causing the friction between the impeller blades and the casing to cause the entire fan. Damage; at the same time, choose the matching size and length of the air duct, and adopt reasonable starting measures, which has important practical significance for its safe and reliable operation. Steel Casting Parts,Accurate 3D Printer,3D Print Automotive,3D Print Engineering Guangdong Fenghua Zhuoli Technology Co., Ltd , https://www.fhzl-3dprint.com