GY7-41 boiler induced draft blower

The main features of the Y7-41 industrial boiler induced draft fan are: The fan features high efficiency, high total pressure, low noise, A flat performance curve, a wide economic application range, and adopts backward curved plate blades. At the optimal operating point, the total pressure internal efficiency of the fan is 86.5%, and the noise index (A-weighted sound level) is Ls=11.5dB. Both of these indicators are at a very good level compared with various existing industrial boiler induced draft fans in China. This fan has the following significant advantages:

1)The fan has a relatively high pressure, making it particularly suitable for industrial boilers with a capacity of 1 to 20 tons per hour that adopt spiral pipes and are equipped with multi-tube dust collectors.

2) The induced draft fan is made into single suction type: there are six models available, namely No. 4.5, 5.6, 7.1, 9, 10 and 12.5.

3) The position of the fan's air outlet is indicated by the Angle of the casing's air outlet. Both "left" and "right" can be made into three angles: 0 degrees, 90 degrees, and 180 degrees.

4) The transmission methods of the fan are C type and D type. The connection between the motor and the fan adopts belt drive and direct drive with elastic couplings respectively.

Structural features

The fan is composed of parts such as the impeller, casing, air inlet, transmission group and regulating door.

(1) Impeller

There are 16 backward-inclined flat blades made of Q345(16Mn), welded between the arc-conical wheel cover and the flat wheel disc, and have undergone dynamic balance correction. Therefore, it operates smoothly, has high strength and wear resistance, and has a long service life.

(2) Casing

A volute shell is welded with steel plates. It is universal for rotation from "left" and "right" above No. 8.

(3) Transmission group

The main shaft is made of high-quality steel and uses ball bearings. (For No. 4.5-7.1, low-noise type bearings are adopted.) The integral two-part bearing housing is lubricated with No. 2 calcium-sodium-based grease and self-cooled by the fan blades. The structure is simple.

(4) Air inlet

The air inlet of the converging and diffusing type is made into an integral structure and fixed to the inlet side of the casing with bolts.

(5) Regulating door

The Y7-41 series fans are all equipped with regulating doors to adjust the flow rate of the fans. Fans of No. 9 and below adopt a 3-blade, louvered window structure, which is flexible to close and has a simple structure. Fans of No. 10 adopt an 11-blade plum blossom-shaped structure, featuring high regulation efficiency and reliable structure. The regulating door is axially installed in front of the air inlet. The regulating range is from 90 degrees (fully closed) to 0 degrees (fully open). The handle position of the regulating door, when viewed from the air inlet direction, for right-rotating fans, counterclockwise rotation of the handle changes from fully closed to fully open, and for left-rotating fans, clockwise rotation of the handle changes from fully closed to fully open.

To ensure the normal operation of all parts of the regulating door, it is necessary to lubricate it well. As the gas temperature of the induced draft fan is relatively high, high-temperature (260℃) bentonite grease is used as the lubricating grease, which can still guarantee the lubrication effect during high-temperature operation.