Your Professional Centrifugal Fan Manufacturer in China
HUAHAO group specializes in the research and development and manufacture of motors & blowers. Our services are widely applied to the fields of home appliances: Range hood, industrial heater, Air cooler, Air condition, Air purifier, dehumidifier…etc and other ventilation systems
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Over the years we have gained specialization in designing and manufacturing of the motors and blowers to suit the different application and environment.
What is Centrifugal Fan
A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, or squirrel-cage fan (because it looks like a hamster wheel). Tiny ones used in computers are sometimes called biscuit blowers. These fans move air from the rotating inlet of the fan to an outlet. They are typically used in ducted applications to either draw air through ductwork/heat exchanger, or push air through similar impellers. Compared to standard axial fans, they can provide similar air movement from a smaller fan package, and overcome higher resistance in air streams.
How Does a Centrifugal Fan Work
The working principle of centrifugal blowers is relatively simple. They employ centrifugal force - the force created when an object moves around a rotation point.
In effect, the energy of the rotation is transferred to the air or gas. This means that impellers have the mechanical function of rotors-rotating components that introduce energy into a system. The opposite of a rotor is a turbine, a device which removes energy from a mechanical system for use elsewhere.
Benefits of Centrifugal Fans
Multiple Sizes
These fans are available in several sizes to accommodate diverse applications-such as those found in tight spaces or difficult to reach areas.
Enhanced Durability
These fans are durable enough to properly operate in the most corrosive and erosive environments.
Ability to Restrict Overloading
Certain centrifugal fans are fitted with non-overloading horsepower curves will ensure the motor will not overload if its capacity is exceeded.
Easy to Maintain
Lighter material fans can be easily cleaned when you deem it necessary. Moreover, certain fans have self-cleaning characteristics, making daily maintenance that much easier.
High Versatility
Centrifugal fans are useful for multiple airflow/pressure combinations, and they can process several airflow conditions, including clean, dry, and wet air.
First-rate Energy Efficiency
Constant airflow allows centrifugal fans to generate energy that reaches up to 84% static efficiency. These higher efficiency levels are ideal for sustaining larger air systems.
The Different Types of Centrifugal Fans
Forward Curved Centrifugal Fans
Forward curved centrifugal fans have a relatively large amount of forward facing curved impeller blades (facing the direction of rotation of the impeller). The blades are relatively shallow in terms of the length of the blade arc. Forward curved fans can either be of a single-inlet or double-inlet type with air inlet to the impellers at right angles to the direction of airflow through the fan.
This type of fan requires a fan scroll housing or volute to convert the high velocity air exiting the blades into static pressure and also to provide directionality for the output airflow. The power demand for this type of fan steadily increases in proportion to the airflow being delivered, meaning that motors can easily be overloaded if operating at higher flow rates and lower pressures.
This type of fan is particularly suited to higher flow rate applications requiring lower operating speeds in comparison with a backward curved fan, but has a lower overall efficiency when compared with a backward curved fan.
Backward Curved Centrifugal Fans
Backward curved centrifugal fans typically have fewer impeller blades which are facing away from the direction of rotation of the impeller. The blades have a longer blade arc length in comparison with forward curved fans, so in general tend to be larger in diameter.
The impellers usually have a shaped inlet shroud at the inlet side to the impeller and can be either single-inlet or double-inlet in design. In contrast to a forward curved impeller, static pressure is developed across the depth of the impeller blade meaning that backward curved impellers can be configured for use either with or without a fan scroll. Adding a fan scroll can provide a better pressure characteristic so is therefore suited to combustion (boiler) fan applications or applications which need a higher pressure capability. Operation without a fan scroll is more suited to applications with higher flow rate requirements. The power demand for a backward curved impeller fan, typically peaks around the middle of its performance characteristic, so that the motor is less liable to be overloaded at lower pressures & higher flow rates.
Backward curved fans offer an improved level of efficiency in comparison to a forward curved impeller type, but typically require higher speeds of operation to achieve higher airflow rates.
Crossflow &Tangential Fans
Crossflow & tangential fans consist of an extended forward curved impeller type (similar to a cylindrical lawn mower blade) and also requires the use of a type of fan scroll (volute). Instead of the air entering the impeller through the eye of the impeller, for this type of fan the scroll housing has an opening on one side usually at 90° from the direction of the air outlet.
This type of fan is suited to applications that require a high airflow rate but at low system restriction pressures. Due to the reduced overall height of this product type it is particularly suited to high flow rate applications within a reduced space envelope. This type of product has similar characteristics to a regular forward curved fan in terms of its power usage, but has a lower overall efficiency than a regular forward curved fan.
Due to the blade length and proximity to the scroll housing’s inlet, these types of fans are can suffer from excessive noise levels or blade passing noise. These fans are also not suited to higher pressure applications and quickly become unstable when subjected to higher system restriction pressures.
Radial Bladed Fans
Radial bladed fans are in some ways similar to a backward curved impeller, but have straight impellers blades typically angled backwards from the direction of rotation but can sometimes be vertical from the impeller axis.
Radial bladed fans act in a very similar way to a regular backward curved fan but for most applications require the use of a fan scroll to provide directionality of flow and convert some air velocity into static pressure. Radially bladed impellers can used for recirculation fans to spread air in all directions, such as in an oven. For recirculation type fans, the impeller is usually of a single piece construction (without an inlet shroud) and has fewer blades and a more open construction. This is to prevent the build-up of contamination on the impeller blades (e.g. soot), particularly in high temperature applications where exhaust gasses are being handled.
Radially bladed fans can also be used in applications that require the fan to have reversible direction of operation in which case the quantity of blades can be higher and are orientated radially from the rotational axis. Depending on the design of impeller used, the power requirement can vary significantly as can overall efficiency, but in general these types of impellers are less efficient than a backward curved fan.
Applications for Centrifugal fans
Industrial Ventilation
Centrifugal fans are used in Industrial Ventilation Systems to Exhaust Fumes, smoke, and other pollutants from manufacturing processes, warehouses, and workshops. They are also used to maintain a positive pressure in cleanrooms to prevent the entry of contaminants.
HVAC Systems
Centrifugal fans are widely used in heating, ventilation, and air conditioning HVAC systems to move air through ducts and distribute it throughout a building. They are also used in air handling units to regulate temperature and humidity levels.
Air Purification
Air purification systems use Centrifugal fan to remove dust, pollen, and other airborne particles. They are commonly found in air purifiers, air scrubbers, and dust collectors.
Power Generation
Centrifugal fan are used in power plants to provide cooling air to the condenser, which converts steam back into the water. They are also used in cooling towers to dissipate heat from the cooling water.
Material Handling
Centrifugal fan are used in Material Handling systems to transport bulk materials such as grain, sand, and flour. They are also used in pneumatic conveying systems to move powdered and granular materials through pipelines.
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Common Problem of Centrifugal Fan
Q: What is difference between centrifugal and axial fan?
Q: What is the purpose of a centrifugal blower?
Q: What is centrifugal inline fan?
Q: What are the advantages of centrifugal blower?
Q: What are the characteristics of a centrifugal fan?
Q: Are centrifugal fans better?
Q: What is an example of a centrifugal fan?
Q: What is the full form of BLDC?
Q: What size are centrifugal fans?
Q: How do centrifugal fans work?
Q: What is the pressure of a centrifugal fan?
Q: Are centrifugal fans loud?
Q: How do you calculate centrifugal fan?
Q: Are centrifugal fans quiet?
Q: What is KV in BLDC?
Q: What is axial flow fan?
Q: What is mixed flow fan?
Q: What is the difference between a blower and a centrifugal fan?
Q: What is the maximum vibration level of a centrifugal fan?
Q: What is the importance of centrifugal fan?
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