What is an external rotor axial fan? Working principle, characteristics, classification and application overview
Product Overview
External rotor axial fans are extensively used for ventilation and cooling in various building facilities and refrigeration equipment. Known for their compact structure, easy installation, reliable operation, low noise, and high efficiency, these fans are ideal for hotels, restaurants, industrial enterprises, office buildings, theaters, and more. They serve as perfect companions for refrigeration units like cold storage cabinets or are used for general ventilation and cooling purposes.
Product Features
- Compact Design: The external rotor axial fan boasts a compact design, making it easy to install in various spaces.
- High Efficiency: These fans operate efficiently, leading to significant energy savings.
- Low Noise: Optimized design ensures low operational noise.
- Reliable Operation: The fans offer stable performance and long-term reliability.
Application Areas
External rotor axial fans find widespread applications in various buildings and equipment, including but not limited to:
- Hotels and Restaurants: Utilized in air conditioning and ventilation systems.
- Industrial and Mining Enterprises: Part of cooling and ventilation systems.
- Office Buildings and Theaters: Provide effective ventilation and air circulation.
- Refrigeration Equipment: Suitable for supermarket cold cabinets, ice machines, air coolers, water chillers, and condensing units.
Classification and Specifications
Motor Types
External rotor axial fans come in two types: single-phase asynchronous capacitor motors and three-phase asynchronous motors. The single-phase motors operate at 120V, 60Hz or 220-240V, 50/60Hz; three-phase motors at 380V, 50/60Hz. Custom motors with different voltages and frequencies can also be produced according to customer requirements.
Size Specifications
Based on the impeller diameter, external rotor axial fans are available in 13 models, with blade diameters ranging from 200mm to 900mm. They typically feature 5 or 7 blades, made of either low carbon steel or plastic.
Protection Levels
External rotor axial fans can be classified into three protection levels: IP54, IP44, and open type:
- IP54: Mainly used in cold storage, evaporators, air coolers, etc.
- IP44: Commonly used in central air conditioning, heaters, heat pumps, etc.
- Open Type: Suitable for air purifiers and other clean, low-humidity environments.
Airflow Direction
Fans are categorized into blowing and suction types based on airflow direction. Suction airflow moves from the blade towards the grille; blowing airflow moves from the grille towards the blade. The airflow direction can also be distinguished by the blade's curvature: concave for suction and convex for blowing.
Installation and Application
Installation Methods
External rotor axial fans offer various installation methods to meet different application needs:
- Ducted Type: Used for indoor ventilation in building facilities.
- Panel Type: Suitable for air coolers, evaporators, outdoor units of air conditioners, etc.
- Guard Type: Paired with heaters, welding machines, air conditioning modules, etc., and used in kitchens, bathrooms, bars, hotels, theaters for ventilation, as well as with cold storage and cabinets.
Technical Specifications
- Stepless Speed Regulation: Speed can be adjusted via transformers or frequency converters.
- Noise Testing: Noise levels are tested according to national standards to ensure accurate and reliable data.
- Lubricated Bearings: Permanent lubricated sealed deep groove ball bearings extend the fan's lifespan.
- Motor Protection: Single-phase motors include thermal protectors, and three-phase motors can have them installed upon request.
- nsulation Class: Available in Class B or Class F, suitable for high-temperature environments.
External rotor axial fans, with their efficient performance, low noise, and easy installation, demonstrate unparalleled capabilities in various ventilation and cooling applications. Whether used for refrigeration units or industrial ventilation systems, external rotor axial fans are a reliable and effective choice.
