Centrifugal fan installation precautions

　　Centrifugal fan installation precautions

　　In order for us to use centrifugal fans well, we must be careful when installing centrifugal fans. Before installation, first check the mechanical parts of each part of the fan. The impeller, main shaft and bearing should be carefully checked. If damage is found, repair it, and then clean the inside of the bearing box with kerosene. Then measure whether the gap between the bearings is reasonable. If the span between the two bearings is found to be large, the equipment must be shut down in time and processed.

　　Also pay attention to the following points:

　　1. The installation of the centrifugal fan unit should be directly placed on the foundation and leveled with pairs of inclined shim irons.

　　2. For centrifugal fans assembled on site, the cutting surface on the base should be properly protected, and there should be no rust or manipulation. When the base is placed on the foundation, a pair of inclined shim irons should be used for leveling.

　　3. The bearing seat and the base should be tightly connected, the longitudinal unlevelness should not exceed 0.2/1000, use a spirit level to measure on the main shaft, and the horizontal unlevel bottom should not exceed 0.3/1000. Use a spirit level on the horizontal mid-face measuring.

　　4. Before the bearing bush is shaving, the rotor axis line and the casing axis line should be calibrated. At the same time, adjust the gap between the impeller and the air inlet and the gap between the main shaft and the shaft hole on the rear side of the casing to make it consistent with the equipment technology. Document regulations.

　　5. When assembling the main shaft and the bearing bush, they should be inspected according to the equipment technical documents. The interference between the bearing cap and the bearing shell should be 0.03 to 0.04 mm (measure the outer diameter of the bearing shell and the inner diameter of the bearing seat).

　　6. When assembling the fan casing, the position of the casing should be aligned with the rotor axis line as the reference, and the axial and radial gaps between the inlet of the impeller and the inlet of the casing should be at a high speed to the range specified in the equipment technical file. At the same time, check whether the anchor bolts are tight. If the clearance value is not specified in the equipment technical document, the general axial clearance should be 1/100 of the outer diameter of the impeller, and the radial clearance should be evenly distributed. The value should be 1.5/1000～3/1000 of the outer diameter of the impeller (outer diameter). The smaller takes the larger value). When adjusting, try to make the gap smaller to improve the efficiency of the fan.

　　7. When the fan is aligned, the radial positioning shift should not exceed 0.05 mm, and the tilt should not exceed 0.2/1000.

　　8. For centrifugal fans assembled with rolling bearings, the bearing holes on the two bearing frames have different axial degrees. After the rotor is installed, it is subject to flexible rotation.

　　Reminder: The abnormal noise of the centrifugal fan and the gradual increase in the noise of the fan are common problems in the use of the fan. There are many reasons for this phenomenon. You can use this article as a reference. After finding the reason, you can prescribe the right medicine and solve it more quickly. problem. Friends from all walks of life are welcome to visit, guide and negotiate business.