Fan is a device that passes through a stream of fluid or air. This passes through the blades and blades in which the air flows.
These blades are referred to as the propeller and travel through the rotor in a specific enclosure, so that external objects do not enter it.
Most fans work with an electromotor, but there are other sources, such as hydraulic motors or internal combustion, for this purpose.
Fans produce high-pressure and low-pressure air, unlike compressors that generate high-pressure, high-pressure compressors.
Fans play an important role in controlling the air and the comfort of a person, cooling air conditioning systems, steam extraction, agriculture (separating straw from cereal grains), removing dirt (vacuum cleaner), and so on.
Types of Fan
There are three main types of fan.
The axial fan fan moves the air along the fan axis.
A centrifugal fan that uses a rotating propeller for air currents and a crossover fan, which we will discuss below.
Axial flow fan
Axial flow fans have blades that move the air along the rotating axis of the blades.
This model uses a lot of fans from small fan motors to large fan fans used in the wind tunnel.
The fan is cheap and lightweight, therefore it is used in air conditioners and industrial vents.
The diameter of these fans ranges from 300-400 mm to 1800-2000 mm and works at a pressure of 800 Pa.
Typical axial fan types
The benefits of high air pressure produce low pressure.
Due to low pressure, it does not connect to the channel.
It is cheap because of its simple construction, if it is installed on the roof, it works best. It can create a reverse airflow that is used in air conditioning.
Disadvantages have a high overall efficiency
Advantages of a propeller fan are higher pressure and better performance for high pressure medium
The disadvantages of the price of the operation speed are relatively quiet
Advantages for medium upward pressures can be reached quickly at a low pace.
It has the ability to generate flow in reverse direction, suitable for direct connection to the engine shaft, if equipped with airflow, up to 85% efficiency.
Disadvantages are expensive compared with the butterfly fan.
Centrifuge fan (centrifuge)
This fan is often referred to as a squirrel cage or a scroll fan.
This fan has a movable component called a propeller, which connects to the blade assembly through the axis.
The centrifugal fan draws air into itself and pushes it sharply with the blades rotating (centrifugal force), in the blades, the velocity at the end of the blade increases and becomes pressurized.
These fans are capable of operating at high pressures and can work well in extreme operating conditions, high temperatures, dirt and humidity.
The tangential fan or cross flow is sometimes also known as a pipe fan.
This type of fan is widely used in air conditioning.
Crossover fans are made up of a curved blade forward located inside a vortex compartment.
The main stream moves head to head but hits the blades and raises pressure.