What is an axial fan and what is the difference between an axial fan and an axial fan?

There are two types of fans: axial flow and radial flow, which are named after the direction of air flow when the fan is working. When an axial fan works, the blades push the air to flow in the same direction as the shaft, so it is called an axial fan; When a radial fan works, the blades push air in a direction perpendicular to the shaft (i.e., radial), so it is called a radial fan.

When an axial fan works, the blades push the air to flow in the same direction as the shaft, so it is called an axial fan; Axial fans are divided into large axial fans, medium-sized axial fans, and small axial fans. Generally speaking, large axial fans are mainly suitable for exhaust air in places such as dust and gravel yards; Medium-sized axial fans are mainly suitable for indoor ventilation and heat exhaust, such as:

granaries, etc.; Small axial fans are mainly suitable for ventilation and heat dissipation of mechanical equipment, such as electrical cabinets.

Axial fan: A fan whose blades push air in the same direction as the shaft is called an axial fan.

According to the direction of air flow when the fan is working, the fan can be divided into axial flow and radial flow. When an axial fan works, the blades push the air to flow in the same direction as the shaft, so it is called an axial fan; Whereas, when a radial fan works, the blades push the air to flow in a direction perpendicular to the shaft (i.e., radial), hence the name of a radial fan.

Axial fan usage:

Large axial fans are mainly suitable for exhaust air in places such as dust and gravel yards;

Medium-sized axial fans are mainly suitable for indoor ventilation and heat exhaust, such as grain silos;

Small axial fans are mainly suitable for ventilation and heat dissipation of mechanical equipment, such as electrical cabinets.

The axial fan has a collector duct and a diffuser pipe, and the axial fan is just a motor support and an outer ring of the fan.

Axial fan, the exhaust direction of the axial fan is straight along the direction of the shaft, the air inlet and exhaust outlet of the fan are on a parallel line of the shaft, and the axial fan is mainly composed of the fan impeller and the casing, the structure is simple but the data requirements are particularly high. The motor connection of the Qinglu axial fan is generally in the body of the fan, and the motor of the centrifugal fan is connected by the shaft, which is generally placed outside the exhaust cylinder of the fan.

There are two types of axial fans: axial flow and radial flow, which are divided according to the direction of air flow when the fan is working. When the shaft collapse Zhengyou flow fan works, the blades push the air to flow in the same direction as the shaft, so it is called an axial fan.

Whereas, when a radial fan works, the blades push the air to flow in a direction perpendicular to the shaft (i.e., radial), hence the name of a radial fan.

Axial fans are widely used in various industrial occasions and are one of the most widely used fans. The shape of the axial fan is a bit like an electric fan, with a central shaft, and the four fan blades will follow this central shaft to form an axial running fan. Because of the fluidity of this fan gas, it is suitable for use in places with relatively low pressure, in fact, there are still many friends who are not familiar with axial fans, in fact, the role of axial fans is very good.

So, how does an axial fan work?

Axial Fan Operating Principle – Definition

Ordinary axial fans can be used for ventilation in general factories, warehouses, offices, residences and other places, and can also be used for air coolers (air coolers).

Evaporators, condensers, spray drops, etc., there are also mining axial fans, anti-corrosion, explosion-proof axial fans using anti-corrosion materials and explosion-proof measures, with bending and matching explosion-proof motors, can be used to transport explosive, volatile, corrosive gases, the gas transported by the axial fan should be free of significant dust, no viscous and fibrous substances; The temperature of the direct connection type of the motor does not exceed 40, and the temperature of the belt drive type does not exceed 60.

The amount of dust of the conveyed gas shall not exceed 150mg m3, and the axial fan is mainly composed of impeller, casing, motor and other parts, and the bracket is connected with the casing duct by section steel. Among them, the impeller and casing of anti-corrosion axial fans are made of fiberglass, and other types of axial fans are generally made of steel plates.

How Axial Fans Work – How They Work

When the impeller rotates, the gas enters the impeller axially from the air inlet, and is pushed by the blades on the impeller to increase the energy of the gas, and then flows into the guide vane. The guide vanes deflect the gas flow into axial flow, while the gas is directed into the diffuser tube, which further converts the kinetic energy of the gas into pressure energy and finally into the working line. Axial wind turbine blades work in a similar way to the wings of an aircraft.

However, the latter is to act lift upwards on the wings and support the weight of the aircraft, while axial fans fix the position and move the air. The cross-section of an axial fan is generally a wing profile.

The blades can be fixed in position or rotate around their longitudinal axis. The angle of the blades to the airflow or the spacing between the blades can be non-adjustable or arguable. Changing the angle or spacing of the blades is one of the main advantages of axial fans.

A small blade spacing angle produces a lower flow rate, while an increased spacing results in a higher flow rate. Advanced axial fans are able to change the blade spacing while the fan is running (which is quite similar to the first rotor) and thus change the flow rate accordingly. This is called a V-Blade Adjustable (VP) axial fan.

Today I have introduced you to the relevant information of axial fans, I would like to ask you if you understand? In fact, the axial fan is the most widely used fan in industrial sites, the axial fan gas flow is parallel to the central axis, through the above detailed introduction, I believe that everyone is familiar with the working principle of the axial fan, in fact, learning more related knowledge is also a very good effect, I hope my introduction can help readers and friends.

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The cross-flow fan, also known as the cross-flow fan, was first proposed by the French engineer Mortier in 1892, and the impeller is a multi-bladed, long cylindrical shape with forward-facing multi-wing blades. The air flow flows through the impeller, and is affected by the two forces of the blade, so the air flow can reach a long distance, without turbulence, and the air outlet is uniform, because the air flow is forced to turn in the impeller, so the pressure head loss is large and the efficiency is low. It is generally used for air conditioner hang-up, air conditioner fan, air curtain machine, etc.

Axial fan is the airflow in the same direction as the axis of the fan blade, such as electric fan, and the fan of the air conditioner is the axial flow mode of the fan. It is called "axial" because the gas flows parallel to the fan axis. Axial fans are typically used where the flow requirements are high and the pressure requirements are low.

The advantage of the cross-flow fan is that the air supply is far away and the air outlet range is small. Axial fans are the opposite. The cross-flow fan is that when the air enters the fan, the airflow is perpendicular to the motor shaft The cross-flow fan generally uses a relatively long barrel-shaped fan impeller to work, and the fan blade is longer, which can ensure that the overall air circulation volume is based on the use of relatively low speed and low noise.

The axial flow fan has a large wind output at close range.

The biggest feature of the cross-flow fan is that the fluid flows through the fan impeller twice, the fluid flows in the radial direction and finally flows out along the radial direction, the inlet and exhaust directions are in the same plane, and the exhaust gas is evenly distributed along the width of the fan. Due to its simple structure, small size, high dynamic pressure coefficient and long distance, it is widely used in laser instruments, air conditioners, air curtain equipment, dryers, hair dryers, household appliances and grain combine harvesters.

Features: (1) Under the same suitable working conditions, the higher the speed, the more likely it is to surge, and the longer the surge period. When surge occurs, the indication at high speed is stable but its value is small, and the inside of the fan is heavy "panting" and the noise is dull; When the speed is reduced, the indication is unstable and varies greatly, and in the same cycle, the inside of the fan first "gasps" and then "vibrates", and then alternates with each other.

The phenomenon of "vibration" is that the number of indicators increases significantly, the belt shaking intensifies, the vibration of the test system device is relatively strengthened, and the noise changes from dull to sharp;

2) Under different working conditions at the same speed, the smaller the resistance, that is, the larger the area of the vent, the more likely it is to surge;

3) Under the same suitable working conditions, when surge occurs at high speed, the real value deviates greatly from the ideal normal value, but is not much different from the stable value at low speed.

The picture above is a cross-flow fan.

The widely used products are welding machine fans, inverter fans, ultrasonic fans, freezer display cabinet fans, chassis cabinet fans, network cabinet fans, LED display fans, motor soft starter fans, air cooler fans.

To correct one, it's axial fans, not axial fans.

Axial fans get their name from the fact that fluid flows from the axial direction to the impeller and flows out in the axial direction. Its working principle is based on the leaf airfoil theory:

The gas consists of an angle of attack. When entering the impeller, a lift force is generated on the wing back, and at the same time a force of equal magnitude and opposite directions is generated on the wing belly, which causes the gas to be discharged from the impeller in a spiral shape and move forward in the axial direction. At the same time, the gas is continuously sucked in at the inlet of the fan due to the effect of the pressure difference.

For the axial fan with adjustable moving blades, the larger the angle of attack and the larger the perimeter of the wing back, the greater the lift, the greater the pressure difference of the fan, and the smaller the air volume. When the angle of attack reaches a critical value, the gas will leave the profile of the wing back and vortex will occur, resulting in a significant drop in fan pressure and stalling.

The fluid in the axial fan is not affected by centrifugal force, so the static pressure energy that rises due to centrifugal force is zero, so the energy head it produces is much lower than that of a centrifugal fan. Therefore, it is generally suitable for places with large flow and low head, and belongs to the high specific speed range.