Aluminum Alloy 3000mm Backward Curved Centrifugal Fan

This article's table of contents introduction:

1. Key Characteristics of a 3000mm Backward Curved (BC) Fan
2. Common Applications for a 3000mm Aluminum BC Fan
3. Typical Technical Specifications (Estimate for a 3000mm Impeller)
4. Important Considerations for Sizing & Selection
5. Do you have a specific question?

It appears you are describing a specific type of industrial fan. Let's break down the components of your query to provide a clear explanation of what this is, its common applications, and key specifications.

The term "Aluminum Alloy 3000mm Backward Curved Centrifugal Fan" refers to a large industrial fan with the following characteristics:

1. Material: Aluminum Alloy (usually 5083, 6061, or similar marine/industrial grade).
2. Size: 3000mm (which is the impeller diameter, approximately 118 inches or 3 meters). This is a very large fan.
3. Type: Backward Curved Centrifugal Fan (also known as an "Airfoil" or "Backward Inclined" fan).
4. Drive: Typically Direct Drive or Belt-Driven via a motor (often up to several hundred kW).

Key Characteristics of a 3000mm Backward Curved (BC) Fan

• High Efficiency: Backward curved blades are non-overloading, meaning the motor power draw decreases as airflow (CFM) increases. They are the most efficient type of centrifugal fan for clean air.
• Low Noise: The airfoil shape of the blades creates less turbulence than forward curved or radial blades, resulting in quieter operation.
• High Static Pressure: Capable of overcoming significant resistance in ductwork or industrial processes.
• Non-Clogging Design: While not suitable for heavy particulate, they handle moderate dust loads better than axial fans.
• Aluminum Construction (The 3000mm Factor):
  • Why Aluminum? For a 3-meter impeller, weight is critical. Aluminum is significantly lighter than carbon steel, reducing bearing load, motor shaft stress, and structural support requirements.
  • Corrosion Resistance: Ideal for marine environments, salt spray, or mildly corrosive fumes.
  • Spark Resistance: Aluminum is non-sparking, making it safer for handling flammable gases or dust (e.g., paint booths, solvent recovery).

Common Applications for a 3000mm Aluminum BC Fan

Due to its size and material, this fan is used in heavy industrial and large-scale ventilation systems where weight and corrosion are concerns:

• Tunnel Ventilation (Road/Rail): Large-scale supply or exhaust of fresh air (less common than axial, but used for high-pressure requirements).
• Shipbuilding & Marine HVAC: Engine room ventilation, exhaust systems on cruise ships or naval vessels where saltwater corrosion is a risk.
• Large HVAC Systems: Stadiums, convention centers, airport terminals (central station air handlers).
• Fume Extraction: Steel mills, chemical plants, or laboratories handling corrosive non-flammable fumes.
• Cement & Mining (Clean Air Side): Baghouse exhaust fans or primary air supply for processing.
• Wind Tunnels: Large-scale test facilities requiring uniform, high-pressure airflow.

Typical Technical Specifications (Estimate for a 3000mm Impeller)

• Impeller Diameter: 3000 mm (118 inches)
• Airflow (CFM): 200,000 to 600,000+ CFM (340,000 to 1,020,000 m³/h) depending on RPM and blade angle.
• Static Pressure: 2" to 30" w.g. (500 Pa to 7,500 Pa) depending on speed.
• Speed (RPM): 200 to 600 RPM (due to tip speed limitations of aluminum vs. steel).
• Motor Power: 75 kW to 500+ kW (100 HP to 700+ HP) depending on duty.
• Weight (Impeller only): 800 kg to 1,500 kg (1,760 to 3,300 lbs).
• Weight (Complete Assembly): 3,000 kg to 8,000 kg (6,600 to 17,600 lbs) including housing, motor, bearings, and base.

Important Considerations for Sizing & Selection

1. Speed (RPM): Aluminum has lower fatigue strength than steel. A 3000mm fan cannot spin as fast as a steel fan of the same size. Maximum tip speed is usually limited to 60-70 m/s (12,000-14,000 SFPM). High RPM would cause blade cracking or failure.
2. Balance: Due to the large diameter and flexible nature of aluminum, dynamic balancing (two-plane) is absolutely critical.
3. Housing: The housing is often steel (painted or galvanized) or stainless steel (for full corrosion resistance). A 3000mm aluminum housing is rare because it is very expensive and difficult to fabricate at that scale.
4. Drive System:
   • Direct Drive: Rare for this size (motor pole count / VFD limitation).
   • Belt Drive: Most common. Allows for speed adjustment via sheave changes. Requires heavy-duty bearings and a robust base frame (often I-beam or channel steel).
   • VFD: Inverter-duty motor is highly recommended for soft-start and speed control.
5. Inlet/Outlet Configuration: Typically designed for ducted systems (Round inlet, rectangular outlet). The outlet area is roughly 2/3 of the wheel area.

Do you have a specific question?

• Are you looking for a supplier? (e.g., "Who makes a 3000mm aluminum BC fan?")
• Troubleshooting? (e.g., "Why is my 3000mm fan vibrating?")
• Design Calculations? (e.g., "What motor size do I need for 400,000 CFM at 15" SP?")
• Replacement Parts? (e.g., "Can I replace a steel 3000mm impeller with aluminum?")

If you can provide your specific operating point (required Flow in CFM or m³/h and Pressure in inches w.g. or Pa), I can help you confirm if this fan type is appropriate for your application.