Impeller, casing, air inlet, regulating door and transmission part of the centrifugal fan, so about the role of these parts you know how much? I will take you to understand.
1. Impeller:
It consists of 12 pieces of backward inclined wing diagonal cut type blades welded in the middle of the curved conical front disk and flat plate shaped rear disk. Due to the adoption of wing-type blades, the fan ensures high efficiency, low noise and high strength. The impeller is corrected by static and dynamic balance, so it runs smoothly. The impeller structure of the same model of ventilator and induced draft fan is the same.
2. Housing:
The casing is a worm-shaped body welded from ordinary steel plates. The casing of single-absorption fans is made in three different forms: № 8-12 casing is made as a whole structure and cannot be disassembled. The casing of № 14 to 16 is made in two-open type. № 18-28 casing is made in three-open type. The induced draft fan and worm plate are thickened appropriately to prevent wear and tear.
3. Air intake:
The converging, streamlined air inlet is made into a monolithic structure and bolted to the inlet side of the fan.
4. Adjust the door:
Device for regulating the flow of the fan, axially mounted in front of the air inlet. The adjustment range is from 0° (fully open) to 90° (fully closed). The position of the handle of the regulating door is on the right side when viewed from the direction of the air inlet; the right-hand fan handle is pushed upward from downward to fully open; the left-hand fan handle is pulled downward from upward to fully open.
In order to make all parts of the regulating door work properly, it must be well lubricated. For the regulating door of the ventilator, calcium-sodium base grease is used for lubrication. For induced draft fan, due to high gas temperature, grease using molybdenum disulfide high temperature (260 ° C) grease, high temperature operation can still ensure lubrication, № 16 above the fan in the screw plug with dry oil.
5. Transmission section:
The main shaft of the transmission part is made of high-quality steel, and rolling bearings are used in this fan. There are two forms of bearing boxes: № 8 to 16 with an integral cylinder bearing box; № 18 to 28 with two independent pillow block bearing boxes. The bearing box is equipped with thermometer and oil level indicator (only for induced draft fan). Lubricating oil is used No. 30 mechanical oil, oil level according to the implementation of the oil level mark, № 8-16 overall cartridge bearing box how to use dry oil, in the bearing box on the side of the ball should be added to the oil blocking plate, and its fixed groove interoperability to the situation has been made. The induced draft fan is equipped with a water cooling device, therefore, it is necessary to add a water pipeline. Water consumption varies with the temperature, generally 0.5 ~ 1m3/h consider. Compressor is basically the same, are due to the gas flow rate is low, the pressure does not change much, generally do not need to consider the changes in the specific volume of gas, that is, the gas as a compressible fluid processing. Centrifugal fan can be made into right-handed and left-handed two types. From the motor side of the front view, the impeller clockwise rotation, known as the right rotation fan, the impeller counterclockwise rotation, known as the left rotation fan.