An industrial blower fan that can also be differentiated into two terms, an industrial blower and an industrial fan, is a mechanical or electro-mechanical device, which is used to transfer constant flow of larger volumes of air. An industrial blower fan is used to meet the demand of industrial operations due to its construction, including in ventilation, combustion, transporting materials, cooling and heating systems, dust control, air conveyor systems, industrial vacuum applications and so on. Industrial blower fans are operated by wheels or propellers that are driven by motors or turbines.
An industrial blower fan is made of cast aluminum or stainless steel, which is constructed with continuous welds. Also, it is equipped with ball or roller bearings in cast iron bearing housings, which provide long bearing life. The motors of industrial blower fans are generally TEFC or EXP enclosures, which do not allow outside air to freely circulate through the interior of the motor and further offer higher protection against weather, dirt, and moisture.
We are all familiar with general-purpose fans, which are used at home, stores, restaurants, or other places in order to provide cool air to lower the temperature. General purpose fans come in different sizes, while comparing these two types of fans, they provide relatively lower pressure than industrial blower fans. In other words, the air that the general-purpose fans transfer is lower in volume than industrial blower fans. The variation between industrial blower fans and general-purpose fans is in their materials. The general-purpose fans are made of the least expensive materials and components since they are not often used in environments with extreme high temperatures, which require the fans to cool the surroundings. While the industrial blower fans are made of heavy-duty materials to support the high pressure and volume of air they provide.
RPM refers to Revolution(s) Per Minute, which means the number of revolutions that a circular object is able to reach every minute. A revolution is regarded as 360 degrees of rotation.
CFM refers to Cubic Feet Per Minute, which means how much air an industrial blower fan is able to discharge every minute. The number of CEM is related to the diameter and the rotating rate of the industrial blower fan. The larger the diameter of the industrial blower fan is, the bigger number of CEM is. The higher the rotating rate is, the bigger number of CFM is.
WG refers to inches water gauge, which means the static pressure resistance through the complete system.
● Compression Ratio
Compression ratio is related to the horsepower of the industrial blower fan, the higher the ratio is, the more horsepower it could provide. Compression ratio is the ratio of absolute stage discharge pressure to the absolute stage suction pressure.
Since industrial blower fans can be divided into two main categories, there are differences in either blowers or fans depending on the correlation of pressure and flow or the operating channel.
● Centrifugal fans and blowers
Centrifugal blowers or fans are operated by wheels, with high speed impellers or blades typically rotating at about 15,000 rpm. The speed of the airflow that enter into the blower or fan is increased by the high pressure that the impellers or blades offer through outlet in radial direction. They can be single or multi-stage units which provide a variety of blade orientations, including backward curved, forward curved, and radial. They can be differentiated into two types by the capability of generating pressure when operating, including low pressure, medium pressure and high pressure.
● Positive Displacement Blowers
Positive displacement blowers utilize the mechanical means to squeeze fluid in order to increase pressure or velocity. Comparing to centrifugal blowers, positive displacement blowers are operated by moving the fluid the same speed as the pressure in order to make the fluid flow, instead of merely giving pressure to promote the air flow. Positive displacement blowers can not only be driven by direct-coupled electric motors, but also by gas engines, hydraulic motors, etc. in special conditions.
● Axial Fans
Axial fans are operated like most general-purpose fans, which uses a propeller with two or more blades to drive. The blades that rotate around an axis draw air in parallel to that axis and force air out in the same direction. The centrifugal fans and blowers provide a variety of blade orientations, while axial fans can only provide the air flow in a single direction. Most industrial blower fans can be used in a variety of applications. However, the axial fans are not able to convey materials because of their construction.
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