Fan, the following is a detailed introduction about fan: definition and working principle of the definition: a fan is a kind of rely on the input mechanical energy to increase the gas pressure side by side to send gas driven fluid machinery. Working principle: by using the blade on the rotor rotation drive air flow, blade inside the surrounding air suction fan, through the bearing, motor and reducer, the coordinating role of increased rotor speed which will blow out air. The driving force of the fan comes from the horizontal thrust and vertical thrust on the blade. When the speed increases, the air volume and wind pressure also increase correspondingly,
enhancing the air output capacity. Structure of impeller: drive, key components of the gas flow by the wheel cover, such as roulette, blades, shaft parts, the main structure connection way as welding and riveting. Image chassis: used to protect the internal components and guide the gas flow, gas collection came out from the impeller, and can convert the kinetic energy of the gas to static pressure.
Classification according to the use of industrial fan: used in factories and other industrial sites, ventilation, air blast, dust, etc., large air volume, high pressure, need to have strong corrosion resistance and abrasion resistance. Fan: building used for building ventilation, air conditioning and other systems. Pressure in partial fan: used to local pressure into the air. Draw-out partial fan: used in air “from the local area. : roof fan is installed on the roof, to the structure of the ventilated take a breath. Air conditioning fan: used in air conditioning system, to adjust indoor air flow and temperature. Induced draft fan: used for the gas from the a space, such as induced wind, etc. The jet fan: usually used in space such as tunnel ventilation. According to the classification of pressure suction fan: generally used for air, make the space where the formation of negative pressure. Low pressure fan, fan total pressure is low, such as low pressure
centrifugal fan PTF 1 kpa or less full pressure, low flow fan axis total pressure PTF acuities were 0.5 kpa. Medium pressure fan: stress between low pressure and high pressure, intermediate pressure centrifugal fan total pressure is 1 kpa < PTF < 3 kpa. High pressure fan: can produce high pressure, such as high pressure centrifugal fan pressure for all 3 kpa < PTF < 15 kpa, high flow fan axis total pressure of 0.5 kpa < PTF < 15 kpa.
Fan: Outlet pressure (booster pressure) ≤ 15,000 pa. Fan: outlet pressure (pressure) in 15000-350000 pa. Compressor outlet pressure (pressure) or 350000 pa. Classification according to the working principle of positive displacement blower: including reciprocating and rotary, common roots blower, rotary compressor, etc., within the scope of certain pressure, flow rate changes small. Turbine fan: centrifugal, axial flow, mixed flow and cross flow form, to take advantage of the impeller rotating gas power, make the gas gain energy. Jet fan: by spraying a high-speed airflow, drive around the gas flow, form ventilated effect.