Axial fan is the airflow in the same direction as the axis of the fan blade, such as an electric fan, an air conditioner, an external fan, an axial flow fan.
Also called the local fan axial flow fan is a fan used in industrial and mining enterprises, security is different from its general fan motor and fan blades are in a cylinder shape is in a cylinder shape, for local ventilation, convenient installation, ventilation effect, safety, can be connected with the air duct the wind sent to the designated area.
According to the characteristics of axial fans, the following classification is made:
According to the material classification: Steel fans, FRP fans, plastic fans, PP fans, PVC fans, aluminum fans, stainless steel fans and so on
According to the use of categories: explosion-proof fans, anti-corrosion fans, explosion-proof anti-corrosion fans and other types.
According to the requirements of classification: pipe type, wall type, post type, fixed type, rainproof dust-proof type, motor external type, etc..
Axial fan application:
Can be used for metallurgy, chemical industry, light industry, food, medicine and civil construction places such as ventilation or enhance heat dissipation. If the shell is removed, and can also be used free fan, but also in the exhaust pipe to the longer interval are arranged in series, in order to improve the air pressure in the pipeline.
Axial fan characteristic:
The fan has the advantages of simple structure, stable and reliable, small noise and wide range of function choices.
The main difference between centrifugal fans and axial fans is that:
1. The centrifugal fan changes the flow direction of the medium in the air duct, while the axial fan does not change the flow direction of the medium in the air duct;
2, the former installation is more complex
3, the former motor and fan are generally connected through the shaft, the latter motor generally in the fan;
4, the former is often installed in the air conditioning unit inlet and outlet, boiler drum, fan, and so on. The latter is usually installed in the middle of the air duct or the front end of the air duct.
In addition, there are diagonal fans, the wind pressure coefficient is higher than the axial fan, and the flow coefficient is larger than the centrifugal fan.
Fill the gaps between the axial flow fan and centrifugal fan. Meanwhile, the utility model has the characteristics of simple and convenient installation.
A mixed flow fan combines the characteristics of axial and centrifugal fans, although it looks more like a conventional axial fan.
The curved plate blade is welded to the conical steel hub. Change the flow by changing the angle of the blade in the upper inlet housing of the impeller.
The casing can have an open entrance, but more commonly, it has a right angled bend to allow the motor to be placed outside the pipe. The excretory shell expands slowly to slow down the flow of air or gas and converts kinetic energy into useful static pressure.
General knowledge of fan maintenance and storage:
A. the use of the environment should always be kept clean, fan surface clean, inlet and outlet should not be debris. Regular elimination of dust and other dust in the fan and pipe.
B. only in the fan can be operated completely under the party, and to maintain adequate capacity of power supply facilities, voltage stability, non phase operation power supply line must be as the special line, should not be long-term use of temporary power supply lines.
During the operation of the C. fan, it is found that the fan has abnormal sound, the motor is seriously heated, the shell is electrified, the switch is tripped and the engine can not start, etc., it should be checked immediately. In order to ensure safety, maintenance is not allowed in the operation of the fan. After the overhaul, the test operation should be carried out for about five minutes, confirm no abnormal phenomenon, then turn on the machine.
D. according to the use of environmental conditions not on a regular basis to supplement or replace the bearing grease, to ensure the fan in the operation process of good lubrication, gas of not less than 1000 hours / times, enclosed bearings and motor bearings, gas 3 lithium base grease filled bearing with ZL - 2/ 3. Oil free operation is strictly prohibited.
E. fans should be stored in a dry environment to prevent the motor from being damp. Rainproof measures should be taken when the fan is stored in the open air. In the storage and transportation process should prevent fan bump, so as not to damage the fan.