General information of various common fans

The use of fans
The Y8-39 and Y9-38 two-series boiler centrifugal induced draft fan is designed to make the induced draft fan work in an efficient area to achieve the purpose of energy saving when the industrial boiler is operating under variable conditions. The Fan Industrial Energy Saving Group of the Ministry of Machinery Industry organizes the national fan. The high-efficiency and energy-saving products promoted by the industry-famous co-designer, the National Committee of the State Council and the Ministry of Machinery Industry have the advantages of high efficiency, low noise, and wide range of performance and efficiency.
The fan is suitable for 0.5-35t/h industrial boiler equipped with economizer (preheater) and smoke-removing dust collector. For those with similar intake conditions and suitable performance, the maximum intake air temperature must not exceed 250°C.
Before the induced draft fan, a dust removal device with a dust removal efficiency of not less than 85% must be installed to reduce the dust content of the flue gas entering the fan, reduce the wear of the dust on the fan, and increase the service life of the fan.

The characteristics of the fan
At present, there are many industrial boilers, fuel quality and fuel quality are different, and dust collectors and economizers with different resistances are used. The required draft fans have different air flow rates and wind pressures. Adaptability, it is proposed for the Y8-39 and Y9-38 two series fans for users to choose. The two series fans with the same machine number have the same connection and installation dimensions.

Fan type
1, the fan made a single inhalation. There are three machine numbers: N04, 4.5, 5, 5.6, 6.3, 7.1, 8, 9, 10, 11.2, 12.5, 14, 16.
2, the fan can be made clockwise rotation and counterclockwise rotation in two forms, from the drive part of the front view of the fan, such as the clockwise rotation of the impeller is called the right-hand fan, said to the right, on the other hand, said the left-hand fan, to the left.
3. The outlet position of the fan is represented by the outlet angle of the casing. The right-hand fan and the left-hand fan can be made into six angles of 0°, 45°, 90°, 135°, 180° and 225°.

Structure and characteristics
Fan consists of impeller, casing, air inlet, transmission group, adjusting door and other components.

Impeller: The material is 16Mn, the length of the phase between the forward curved blade, welded in the arc cone front plate and flat plate in the middle, the impeller after the formation of a strict static balance correction and overspeed test, so the operation is stable and reliable.
Chassis: welded to a scroll-shaped steel plate as a whole. A ash door is opened on the worm gear to facilitate the removal of dust from the blades and the cabinet. Ensure balance and aerodynamic performance of the impeller.
Air inlet: made of converging streamlined integral structure, bolted to the fan side.
Transmission group: It consists of a main shaft, a water-cooled bearing box and a coupling.
The main shaft is made of high-quality steel and adopts rolling bearings. The bearing box is of integral and split type. N04-6.3 Integral type bearing housing: N07.1～16 adopts partial bearing housing. Both bearing housings need water cooling. The water consumption varies with operating temperature and ambient temperature, generally 0.5m3/h. ~h ~ 1m3/h considered. The bearing box is equipped with a thermometer and oil level indicator. The bearing box is used with No. 30 mechanical oil.
Adjustment door: used to adjust the fan flow rate. Adjusting the door to the petal-centered type, installed axially in front of the air inlet, with the use of external transmission structure, flexible and convenient rotation, the adjustment range of all 90 ° (fully closed) to 0 ° (full open). Adjust the position of the door of the door from the direction of the air inlet to the right, rotate the fan to the right, and push it from bottom to top from full closed to fully open: rotate the fan to the left, the handle is fully closed from top to bottom To fully open direction. In order to adjust the door to work properly, we must do a good job of lubrication. It is recommended to use high-temperature (260°C) bentonite so that the fan will not fail at high temperatures.