Anti-Corrosion Fan: Structure and Classification
Structure of Anti-Corrosion Fan:
- Housing: The housing is constructed from steel plates welded into a spiral shape, complete with a bearing bracket and fan seat.
- Impeller: The impeller comprises two sets, each with 10 airfoil blades and an arc-shaped front disc. These are dynamically balanced for smooth operation.
- Bearing Seat: This component uses a double-row radial spherical bearing, lubricated with calcium sodium-based grease.
- Air Inlet: The air inlet is made of steel plates and features a conical arc flow channel.
The anti-corrosion fan has a compact structure, making it easy to install and maintain. It primarily consists of the impeller, casing, air inlet, bearing seat, and motor.
Classification of Anti-Corrosion Fans:
- Based on Gas Flow Direction:
- Centrifugal Anti-Corrosion Fan: In this type, the motor drives the impeller to rotate within the volute casing. Air is drawn in through the impeller’s center, increasing the gas pressure and speed due to the blade’s dynamic action. The gas is then expelled through the exhaust port under centrifugal force.
Components: The centrifugal fan typically includes an impeller and casing. In smaller models, the impeller is mounted directly on the motor, while in medium and large models, it is connected via a coupling or pulley. These fans usually have a single-stage impeller for single-sided air intake, though larger models may feature double-suction designs.
- Axial-Flow Anti-Corrosion Fan: This fan type uses a motor-driven impeller within a cylindrical casing, drawing air through a collector. The impeller increases the gas pressure and speed, discharging it axially.
Components: Small low-pressure models consist of an impeller, casing, and collector, often installed on building walls. Larger high-pressure models include collectors, impellers, streamlined bodies, casings, diffusers, and transmission components. The number of blades, generally ranging from 2 to 24, determines wind pressure, and the blade installation angle, between 10° and 45°, affects air volume and pressure.
- Centrifugal Anti-Corrosion Fan: In this type, the motor drives the impeller to rotate within the volute casing. Air is drawn in through the impeller’s center, increasing the gas pressure and speed due to the blade’s dynamic action. The gas is then expelled through the exhaust port under centrifugal force.
- Based on Pressure:
- Low-Pressure Anti-Corrosion Fan: This type operates under standard atmospheric conditions with a full pressure (PtF) of ≤ 1 kPa.
- Medium-Pressure Anti-Corrosion Fan: This type operates under standard atmospheric conditions with a full pressure (PtF) between 1 kPa and 3 kPa.
- High-Pressure Anti-Corrosion Fan: This type operates under standard atmospheric conditions with a full pressure (PtF) between 3 kPa and 15 kPa.