Howden Axial Fan

Howden Axial Fan:

Howden axial fan is made into a single suction fan, and the machine numbers are №4C, 5C, 6C, 8C, 9C, 12D, and 12.4D. Y5-48 boiler induced draft fan has №4C, 5C, 6.3C, 8C, 10C, 12.5CD; Y6-30 boiler induced draft fan has 3.5C, 4.3C, 4.8C, 5.4C, 6.5C, 7.5C, 8.5C seven kind.

Boiler centrifugal exhaust and induced draft fan can be made into two types: left-handed and right-handed. Looking directly at the fan from the transmission part, if the impeller rotates clockwise, it is called right-handed, indicated by "right", and counterclockwise is called left-handed, indicated by "left".

The position of the fan air outlet is indicated by the angle of the air outlet of the chassis. "Left" and "Right" can be made into three angles of 0 degrees, 90 degrees, and 180 degrees.

2. The fans are all centrifugal flue gas-induced draft fans, which are composed of an impeller, casing, air inlet, transmission part, adjusting a door, and other parts.

Impeller: There are 12 backward inclined plate blades made of 16Mn material, which are welded between the arc-shaped front plate and the rear plate, and are corrected by static and dynamic balance. So it runs smoothly, with high strength, wears resistance, and long service life. longer.

Chassis: Welded with steel plate to form an integral volute. "Left" and "Right" rotations are common for №8 and above.

Air inlet: The convergent air inlet is made into an integral structure and fixed on the air inlet side of the casing with bolts.

Transmission group: The transmission main shaft is made of high-quality steel and adopts rolling bearings. (2) Type: integral cylindrical bearing box, 37# oil lubrication, oil level mark, and thermometer above No. 8, with water cooling device, need to add water pipe, water consumption 0.5-1m3/h, fan 6 below No. 8 is cooled. Type (I): No.4-6 uses two parallel seats, lubricated with bearing grease or molybdenum disulfide, two semicircular fan blades are used for self-cooling between the casing and No.8-12.4, and two parallel bearing housing.

Adjusting door: used to adjust the air volume, it is axially installed in front of the air inlet, and the rotation is flexible and convenient. The adjustment range is from fully open to fully closed. The petal-type is used for sizes above 8, and the butterfly valve type is used for sizes below 6. For the adjustment door to work properly, it needs to be well-lubricated and greased.

The model G and Y6-41 series ventilators have been tested by Shenyang Blower Research Institute and have achieved good results. The test data is quoted as follows:

Induced draft fan: Y6-41-11No7.1C matched with 4 tons / hourly coal-fired boiler:

Working temperature: 200 ° C; rotate speed: 2100 rev/min

Design operating parameters: flux: 12500 m³ / h; full pressure: 2596 Pa

Boiler centrifugal exhaust and induced draft fan have the characteristics of good aerodynamic performance, stable operation, small vibration, high efficiency, and long life. Widely used in industrial and mining enterprises, large buildings, hotels and restaurants, and other indoor ventilation.

According to the principle of converting kinetic energy into potential energy, the Howden axial fan uses a high-speed rotating impeller to accelerate the gas, and then decelerates and changes the flow direction to convert kinetic energy into potential energy (pressure). In a single-stage centrifugal fan, the gas enters the impeller axially, changes to radial as it flows through the impeller, and then enters the diffuser. In a diffuser, the gas changes the direction of flow, and the pipe cross-sectional area increases to slow down the gas flow, which converts kinetic energy into pressure energy. The pressure increase occurs mainly in the impeller and secondarily in the expansion process. In multistage centrifugal fans, reflux is used to direct the airflow into the next impeller, generating a higher pressure

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