Centrifugal fans and roots fans are two common types of fans, which have different working principles and structural characteristics.
This article will distinguish centrifugal fans from three aspects: working principle, structural characteristics and application fields.
First, the working principle.
A centrifugal fan is a kind of mechanical equipment that uses centrifugal force to accelerate and transport gas.
The working principle of the centrifugal fan is as follows: the motor drives the impeller to rotate at high speed, so that the gas is sucked into the air inlet in the center of the impeller, and then the impeller accelerates and compresses the gas to flow the gas out of the outlet of the fan.
During the working process of the centrifugal fan, the acceleration and compression of the gas are carried out at the same time.
Roots blower is a kind of mechanical equipment that uses two rotors to work together to accelerate and transport gas.
The working principle of the roots blower is that the electric motor drives the outer rotor to rotate at high speed, so that the gas is sucked into the air inlet between the rotors, and then compressed and discharged along the spiral internal structure to the air outlet.
During the working process of roots blower, the compression and delivery of gas are carried out separately.
Second, structural characteristics.
The centrifugal fan is mainly composed of air inlet, impeller, guide vane, drive device and shell.
The air inlet and outlet of a centrifugal fan are usually located on the same side of the fan, and the shape and size of the air inlet can affect the performance of the centrifugal fan.
The impellers of centrifugal fans usually rotate in one direction and have different blade shapes and numbers.
The guide vanes of the centrifugal fan can adjust the flow direction and flow of the air flow to adapt to different working conditions.
The roots blower is mainly composed of air intake, outer rotor, inner rotor, drive device and housing.
The inlet and outlet of roots blowers are usually located on both sides of the fan, and there is no direct connection between the inlet and outlet ports.
The gap between the outer and inner rotors of roots blowers is very small, so that the gas can be fully compressed.
The speed of the outer and inner rotors of roots blowers is usually the same, and their gearing can be synchronized with them.
Third, the field of application.
Centrifugal fans are widely used in air conditioning, ventilation, dust removal, conveying and compression.
The centrifugal fan is characterized by high pressure, large flow, low noise, simple structure and easy maintenance.
Centrifugal fans are suitable for conveying clean gases and can work in environments with high temperatures and humidity.
Roots blowers are widely used in sewage treatment, water treatment, mining, chemical, food and pharmaceutical fields.
Roots blowers are characterized by stable pressure, uniform flow, low vibration, compact structure and simple maintenance.