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Axial fan how to work the main fault

Release Time：2021-07-20

The axial flow fan uses the change of the moving blade installation angle to shift the performance curve of the fan. The performance curve and different moving blade installation angles and air duct performance curves can obtain a series of working points. If the flow rate and pressure head need to be increased, only the moving blade installation angle needs to be increased. On the contrary, only the moving blade installation angle needs to be reduced. The moving blade adjustment of the axial flow fan has high adjustment efficiency, moreover, the adjusted fan can work in a high-efficiency area, and the axial flow fan adjusted by moving blades can also avoid falling in the unstable working condition area under small flow conditions.
The adjustment of the moving blade of the axial flow fan makes the structure of the fan complicated. The adjustment device of the axial flow fan requires high requirements and high manufacturing accuracy. Changing the installation angle of the moving blade is performed through the moving blade adjustment mechanism, which includes a hydraulic adjustment device and a transmission mechanism. The piston in the hydraulic cylinder is axially positioned by the sleeve and the shoulder of the piston shaft. The hydraulic cylinder can move left and right on the piston, but the piston cannot produce axial movement.
In order to prevent the hydraulic cylinder from leaking through the gap between the piston and the hydraulic cylinder when moving left and right, the piston is also equipped with two rows of grooved sealing rings. When the impeller rotates, the hydraulic cylinder and the impeller rotate synchronously, and the piston is due to the shield and the piston shaft. The rotation also makes a rotary motion.
Therefore, when the axial flow fan of the fan works stably under a certain working condition, the piston and the hydraulic cylinder have no relative movement. The other end of the piston shaft is equipped with a control shaft. When the impeller rotates, the control shaft is stationary, but when the hydraulic cylinder moves left and right, the control shaft will be driven to move together. The control head and other parts are stationary and do not rotate. The blades are installed at the outer end of the petiole, and each blade is fixed on the petiole with 6 bolts, the petiole is supported by the petiole bearing, and the balance weight and the blade are installed at a specified angle. The displacement of the two is different. The balance weight is used to balance the centrifugal force, so that the blade becomes adjustable during operation. The moving blade adjustment mechanism is surrounded by the impeller and the shield. The axial flow fan works safely, prevents dirt from falling into the adjustment mechanism, and makes it move flexibly or not jammed.

Main fault of axial flow fan.
a) Rotor failure, such as rotor imbalance, rotor vibration, etc., the most serious or even impeller flying accident.
B) Blade crack or fracture may occur on the blower and induced draft fan, and many cases have occurred in many large power plants in recent years.
c) Blade wear mainly occurs on the induced draft fan. Due to the poor timing of the electrostatic precipitator or the failure of the electrostatic precipitator, the induced draft fan is worn, which is the most likely failure of the induced draft fan of the coal-fired power station.
Shandong Xingheng Environmental Technology Group Co., Ltd. is located in Luquantun Development Zone, Dezhou, Shandong, the hometown of FRP in China. The company has Grade II qualification for fire protection facilities engineering, Grade II qualification for construction mechanical and electrical installation engineering, Grade II qualification for environmental protection engineering, and safety production license. It is the first in the industry to pass ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health management system certification, and an axial fan invention patent, A fan utility model patent, environmental assessment, safety assessment, three simultaneous and other procedures are complete.