First, the classification of blowers According to the pressure of the fan, the fan can be divided into low-pressure fan, medium-pressure fan and high-pressure fan. Second, the use and structure of the blower The blower is mainly composed of the following six parts: motor, air filter, blower body, air chamber, base (and fuel tank), and drip nozzle. The blower is operated eccentrically by the rotor biased in the cylinder, and the volume change between the blades in the rotor groove sucks, compresses, and discharges the air. In operation, the pressure difference of the blower is used to automatically send the lubrication to the drip nozzle, and drip into the cylinder to reduce friction and noise, and at the same time keep the gas in the cylinder from flowing back. This type of blower is also called a vane blower. The blower delivers medium to clean air, clean gas, sulfur dioxide and other inert gases. It can also produce other flammable, explosive, corrosive, toxic and special gases as needed. Therefore, it can be widely applied to various industrial sectors such as metallurgy, chemical industry, chemical fertilizer, petrochemical, food, building materials, petroleum, mine, textile, gas station, pneumatic conveying, sewage treatment. Rotor: It consists of shaft, impeller, bearing, synchronous gear, coupling, bushing and so on.
The pressure range is as follows:
Low pressure: fan full pressure H ≤ 1000Pa
Medium pressure: 1000Pa < H ≤ 3000Pa
High pressure (centrifugal fan): 3000Pa < H ≤15000 Pa
Low-pressure and medium-low pressure fans are mostly used in ventilation engineering.
2. According to the purpose, it can be divided into general fan, dust exhaust fan, industrial ventilation fan, boiler induced draft fan, mining fan and so on.
Fans are widely used in ventilation, ventilation and high-temperature exhaust in tunnels, underground garages, high-end civil buildings, metallurgy, factories and mines. Depending on the application, the commonly used fans can be roughly classified into the following types:
(1) Centrifugal compressor (2) Power plant fan (3) General centrifugal fan (4) General axial flow fan (5) Gaorui blower (6) Sewage treatment fan (7) High temperature fan (8) Air conditioning fan (9) Fire fan (10) Mine fan (11) Tobacco fan (12) Grain fan (13) Marine fan (14) Dust Fan (15) roof fan (16) boiler drum induced fan
3. Mine fans can be divided into main fans, auxiliary fans and local fans according to their different uses. The main fan is used for ventilation in the whole mine, the auxiliary fan is used for air volume adjustment of a branch airway in the ventilation network, and the local fan is used for ventilation at a local location.
Sewage treatment fans can be divided into: centrifugal fan, high-definition fan, side-flow fan, water ring fan, etc.
4, according to the principle can be divided into centrifugal fan and axial flow fan water treatment blast aeration;
Stirring and aeration of sewage in hospitals and laboratories;
Vacuum feeding in the printing industry;
Stirring and aeration of electroplating tanks and industrial wastewater;
Supply of plastic welding and blowing air supply;
Burner spray, glass industry and others;
5, according to the technical points According to the bearing technology, can be divided into general mechanical bearing blower, shaft suspension bearing blower, air suspension bearing blower.
Impeller: The involute profile is selected for high volume utilization.
Bearing: 3000 type double row radial spherical roller bearing is used as the positioning end of the proximal coupling end. As the free end, the 32000 type single row radial short cylindrical roller bearing is selected as the free end to accommodate the axial displacement of the rotor during thermal expansion.
Synchronous gear: It consists of a ring gear and a hub for easy adjustment of the impeller clearance.
Body: It consists of a casing and left and right wall panels. The left and right wall panels and the bearing housings and seals installed in the left and right wall panels can be used interchangeably.
Base: The medium and small fans are equipped with a common base, and the large fan is only equipped with a fan base for easy installation and debugging.
Lubrication: The gears are immersed and the bearings are splash-lubricated. Good lubrication, safe and reliable.
Transmission mode: The coupling is mainly connected directly. If the performance specifications are required, the V-belt shifting mode can also be selected. The coupling uses a flexible coupling to mitigate shock and compensate for a small amount of axis deviation. In addition to the electric motor as the drive machine, a large flow fan can also be used as a steam turbine or other drive machine.