Overview of DC/EC Backward Curved Centrifugal Fans:
The DC/EC Backward Curved Centrifugal Fan is a type of fan with advanced technology and a unique design. This fan utilizes either direct current (DC) or electronically commutated (EC) drive technology to precisely control the fan's speed and input current, resulting in highly efficient operation. Additionally, the fan incorporates a backward curved design that smoothens airflow within the impeller by adjusting the blade angle. This enhancement significantly improves the fan's efficiency and performance.
The amalgamation of these two technologies grants the DC/EC Backward Curved Centrifugal Fan several advantages such as higher energy efficiency, precise control, and quieter operation, making it an ideal choice for ventilation, dust extraction, cooling, and similar applications.
Characteristics/Advantages:
- Utilizes direct current motors, exhibiting characteristics of high efficiency, low noise, and minimal vibration.
- Backward tilting of impeller blades facilitates smoother airflow within the impeller, thereby improving the fan's efficiency and performance.
- Different impeller structures and parameters can be selected based on various application scenarios to meet different requirements.
Core Advantages:
The DC/EC Backward Curved Centrifugal Fan series possesses the following core advantages:
●- Maintenance-free bearings: Employing maintenance-free ball bearings with a lifespan of over 40,000 hours. These bearings eliminate the need for regular lubrication, thereby reducing maintenance costs and enhancing operational efficiency.
●- Long service life: Crafted using high-quality materials and manufacturing processes, providing a lifespan of over 40,000 hours, implying continuous operation for over 4 years without replacement.
●- Variable-speed motors: EC motors offer precise control and stepless speed regulation through simple controls. Some models feature RS485 network communication protocol for fan grouping control.
●- High efficiency and energy savings: EC motors in ventilation systems achieve over 70% electrical usage efficiency. According to empirical data, the additional cost of an EC fan can be recovered within 6 months through energy savings.
Other Advantages:
DC/EC Backward Curved Centrifugal Fans also possess the following advantages:
●- Low noise: Operating noise levels below 60dB, exhibiting excellent environmental friendliness.
●- Minimal vibration: Demonstrating stable operation with low vibration.
●- High reliability: Manufactured using quality materials and processes, ensuring high reliability.
Core Parameter Types:
Parameter categories (keywords): Voltage, Current, Power (Input Power), Airflow, Air Pressure (Static Pressure), Noise.
Voltage: AC115V (North America)/230V/380V, DC12V/24V, 48V/80V/310V.
Motor Type: EC Brushless External Rotor Motor (Electronically Commutated Motors).
EC represents "Electronically Commutated," signifying the flow of current from one branch to another in a specific manner in power electronics.
More energy-efficient, durable, and quieter, saving up to 50% of power usage.
Frequency: Universal 50Hz + 60Hz.
RS485 (102 motors, 138 motors, 188 motors) network communication protocol functionality.
Selection range for EC series fan:
Power Range: 30W-5.9KW.
Airflow Range: 200-24000m³/h.
Air Pressure Range: 400 - 2100Pa.
Selection (keywords): Drawings, Curve Graphs (P-Q Pressure-Flow Curves).
Operating (working) environmental temperature: -25°C to +60°C.
Operating mode: S1 (continuous operation).
Impeller rotation direction: CW (clockwise direction) as observed from the rotor end.
Protection rating: IP54/IP55 (some models).
Insulation class: F class.
Fan sizes:
Industry-standard general sizes: 133mm, 175mm, 190mm, 220mm, 225mm, 250mm, 280mm, 310mm, 355mm, 400mm, 450mm, 500mm, 560mm, 630mm.
Impeller material:
■ Plastic + Glass Fiber (Plastic +GF): 133mm, 175mm, 190mm, 220mm, 225mm, 250mm (some models).
■ Galvanized Metal: 250mm (some models), 270mm, 280mm.
■ Aluminum Alloy: 310mm, 355mm, 400mm, 450mm, 500mm, 560mm, 630mm.
Core Accessories:
■ Hub ring:
■ Bracket:
■ Grille:
Electronic Protection Functions:
● Locked-Rotor Protection with Auto Restart:
Automatically cuts off the operating current when the fan is blocked by foreign objects or locked by other items, placing it in standby mode to protect the fan from burning out due to excessive current. At intervals, the motor will output a startup signal, enabling automatic fan restart when the lock status is released, restoring normal operation.
● PWM Speed Regulation - Duty Cycle Speed Regulation:
The fan motor comes with 0-10V/PWM duty cycle speed regulation (for motors above 102, RS485 network protocol is available). Customers can input the duty cycle speed regulation signal (PWM) to achieve stepless speed regulation.
● Analog Voltage Speed Regulation (VSP):
When customers require VSP speed regulation for the fan, by designing the fan's speed adjustment section, customers can provide an analog speed adjustment signal (VSP) to enable speed regulation.
● Speed Feedback Signal Output (FG):
When the motor enters working status, it outputs speed information in the form of pulses through the FG signal line. Control circuits can calculate the motor's current speed by receiving these pulse signals, understanding the equipment's operational status.
● Soft-start Protection Function:
During fan startup, the motor's speed gradually increases from zero to the rated speed, rather than directly jumping from zero speed to the rated speed. Soft-start reduces the startup current and torque, protecting both the motor and the power grid.
● Overvoltage Protection,
● Overcurrent Protection,
● Overheat Protection Function.
Application Areas:
DC/EC Backward Curved Centrifugal Fans are suitable for various fields, including but not limited to heating, ventilation, air conditioning systems (HVAC), industrial ventilation, refrigeration equipment, greenhouse cultivation, and other fields requiring efficient and precise airflow. These fans' high efficiency and precise control make them essential components in many applications, providing stable and efficient airflow, primarily including:
Ventilation, dust extraction, and cooling.
Ventilation and draft for boilers and industrial furnaces.
Cooling and ventilation in air conditioning equipment and household appliances.
Drying and conveying of grains.
Cabinet cooling (heat dissipation).
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