The working principle of GY4-41 series boiler centrifugal induced draft fan is basically the same as that of turbo compressor. Due to the low gas flow rate and small pressure change, it is generally not necessary to consider the change in gas specific volume, that is, to treat the gas as an incompressible fluid.

Installation, adjustment, and operation of boiler centrifugal induced draft fan:

Before installation: A comprehensive inspection of all components of the fan should be carried out to ensure that the parts are complete, the rotation direction of the impeller and the casing is consistent, and the connections between each part are tight. Whether the main components such as impeller, main shaft, bearings are damaged, and whether the transmission system is flexible, etc. If any problems are found, they should be repaired and adjusted immediately;

During installation: Pay attention to checking the casing. There should be no tools or debris that fall in or remain inside the casing. To prevent rust and reduce disassembly difficulties on some joint surfaces, a layer of lubricating grease or mechanical oil should be applied. The joint surface between the fan and the foundation, as well as the connection of the inlet and outlet air ducts, should be adjusted to fit naturally. Forced connection is not allowed, and the weight of the ducts should not be added to the various components of the fan. Attention should be paid to ensuring the horizontal position of the fan.

Installation requirements:

Install according to the position and dimensions shown on the drawing, and to ensure high efficiency, it is particularly important to ensure the axial and radial clearance dimensions between the air inlet and the impeller;

After installation, test the transmission assembly and check for any tightness or collision with the fixed parts. Any inappropriate aspects must be adjusted properly;

Lift the regulating door into place, be careful not to install it backwards, and ensure that the intake direction is consistent with the rotation direction of the impeller;

Place the motor in position and install the coupling, then use the coupling to check and adjust the concentricity with the fan spindle. During the adjustment process, use the coupling of the fan spindle as a reference to move the motor position so that the coupling on the fan shaft is concentric with the coupling on the motor shaft;

Fully tighten all connecting bolts and place asbestos ropes between each pair of flange faces to prevent gas leakage.

The centrifugal induced draft fans of GY4-41 series boilers must be fully installed and pass the overall inspection before trial operation can be carried out.