DC centrifugal fans are crucial equipment widely used across various industrial sectors, often facing operational challenges, especially with blade wear. Ensuring efficient operation of the fan requires attention not only to issues like startup, vibration control, and proper shutdown, but also to effective wear-prevention measures that extend the fan’s lifespan. This article explores common issues encountered during the use of DC centrifugal fans and discusses relevant wear-prevention strategies.

Common Problems and Solutions for DC Centrifugal Fans

1. Startup Issues:
   Common startup problems, such as failure to start or excessive startup time, can stem from several factors:
   • Incorrect Startup Procedure: If the startup procedure is faulty, it’s crucial to adjust the equipment to ensure the fan starts properly.
   • Insufficient Motor Power: If the motor’s power is lower than the fan’s requirements, the fan may fail to start or experience unstable speeds. In this case, replacing the motor with one of adequate power is necessary.
   • Rotor Jamming: If the rotor fails to rotate after startup, manually rotate the fan to inspect the cause, which could be due to lack of maintenance or loose internal parts.
   • Incorrect Safety Mechanism Settings: If the fan fails to start due to safety mechanism settings, recheck and adjust the parameters of the safety system.
   • Excessive Energy Consumption by the Impeller: Energy loss during operation is often caused by gas leaks, typically between the front cover and the diffuser. To minimize energy waste, it’s essential to maintain proper clearances and ensure tight contact between the front cover, diffuser, housing, and rotor shaft to improve efficiency.

2. Vibration Problems:
   Vibration is a common issue with DC centrifugal fans. One effective solution is to reduce the fan speed, which helps minimize mechanical load and vibration amplitude. However, adjustments should be made according to the specific use case and user needs to ensure smooth operation.

Wear-Prevention Measures for DC Centrifugal Fans

Fan blade wear not only impacts performance but also reduces the fan’s service life. Implementing effective wear-prevention strategies is key to ensuring long-term, efficient operation.

1. Blade Surface Treatment and Structural Optimization:

   • Hard Alloy Coating and Carburizing: Hard alloy spraying or carburizing on blade surfaces can significantly improve hardness and reduce wear.
   • Ceramic Tile Adhesion and Plasma Cladding: Attaching ceramic tiles or using plasma cladding techniques enhances the wear resistance of the blades and prolongs their lifespan.
   • Structural Optimization: Changing the blade structure, such as converting hollow blades to solid ones or adding serrated patterns to the working surfaces, can reduce wear and increase the blade’s service life.

2. Installation of Pre-Wear Protection Grilles:
   Installing wear protection grilles at the most vulnerable parts of the centrifugal fan effectively prevents the accumulation of particles at the root of the blades and rear disc area. This leads to more even wear and significantly enhances the impeller’s durability, thus extending the fan’s operational life.

3. Use of High-Efficiency Dust Removal Equipment:
   In environments with high dust levels, wear on fans accelerates. To mitigate this, high-efficiency dust removal equipment can be employed to improve the fan’s working environment. By cleaning the working environment, particle accumulation on the blades is reduced, minimizing wear.

4. Wear-Resistant Coating Application:
   Applying a wear-resistant coating to the surface of DC centrifugal fans is a common wear-prevention measure. While this method is simple and cost-effective, the coating’s wear resistance is lower and requires periodic reapplication. It is generally recommended to reapply the coating every 3 to 5 months to maintain the fan’s durability and reduce wear over time.

Conclusion

The operation and maintenance of DC centrifugal fans involve more than just startup and vibration control. Special attention should also be given to long-term issues such as blade wear. By optimizing the fan’s design, applying surface treatment technologies, installing wear protection devices, and improving the working environment, the fan's wear resistance can be effectively enhanced, thus prolonging its service life.

Ruiapple Electric, with its years of technical expertise and innovation, remains at the forefront of the DC centrifugal fan industry. We offer high-efficiency, durable fan products and provide professional solutions to ensure your equipment operates reliably in the most demanding environments.