Xin Feng Mini-Classroom---Methods to Prevent Wear on Stainless Steel Fan Impellers

The degree of wear on stainless steel fan impellers is significantly influenced by the composition, particle size, concentration, shape, rotational speed and angle of the airflow, as well as corresponding temperature and humidity conditions. Uneven gas flow within the impeller accelerates wear on stainless steel fans.

Specific measures to prevent impeller wear:

First, minimize dust and corrosive gas ingress into the stainless steel fan by modifying its operating system to some extent.

Attempt to transform localized wear into uniform wear by enhancing the impeller's wear resistance.

Therefore, improving the dimensional quality of the impeller, applying build-up welding or spray welding to high-wear areas, and adding wear plates to the blades represent an economical and reasonable solution.

The primary purpose of applying wear-resistant coatings is to prevent abrasion. Common coatings include: resin-based anti-corrosion wear-resistant coatings, rubber-based anti-corrosion wear-resistant coatings, water glass, and ceramic anti-corrosion wear-resistant materials.

Wear-resistant composite materials are ceramic composites used to repair and protect worn metal surfaces. They offer excellent wear resistance and strong bonding with the fan impeller metal. However, the coating thickness must reach 6mm or greater, making them unsuitable for rotors with narrow flow channels or stringent startup requirements.

Similarly, adding wear-resistant liners to fan blades to address stainless steel impeller wear presents similar challenges.

Caution: Excessive Current in Stainless Steel Fans

Excessive current in stainless steel fans can cause severe damage to the equipment itself and pose significant potential hazards to operator safety. If excessive current is detected, immediately cease operation, identify the cause, and address it promptly. What causes excessive current?

1. The main shaft speed of the stainless steel fan exceeds the rated value.

2. Misalignment in the coupling connection, excessive tightness of rubber rings, or uneven gaps.

3. Severe vibration affecting the bearing housing.

4. Inlet/outlet dampers not locked during operation.

5. Degradation of parallel stainless steel fans.

6. High gas density or low temperature in the conveyed medium causes high pressure and excessive current.

7. Flow rate exceeds specified limits or air duct leakage occurs.

8. Motor input voltage is too low or single-phase power supply is interrupted.

Generally, excessive current in stainless steel fans stems from improper installation and maintenance. Therefore, installation must strictly follow correct procedures, and relevant maintenance tasks should be performed before each startup and use to prevent further issues caused by malfunctions during operation.