Remove the casing of the centrifugal fan, remove the movable driving device and the impeller, and install a new mechanical seal or packing seal. The advantage of this method is that the new sealing type is optional and the installation is standardized. The disadvantage is the workload and time-consuming.
Adding simple packing seal without dismantling the centrifugal fan.
The drive shaft is also sheathed with two semi-circular workpieces without bushings, and the grooves are welded into a circle toward the bushings.
Thus, the drive shaft passes through the two rings, with the grooves opposite. Each set of packing consists of two pieces, a section of packing and two semi-circular workpieces. First, place two pieces marked“Sleeve” on the shaft and weld the grooves into a ring facing the housing.
Second, the marked“Sleeve” ring welding on the sleeve, note that the inner circle of the ring and drive shaft clearance equal. The hexagonal heads of the two pressure plate bolts are welded on the shell respectively, so that one end of the pressure plate can be pressed on the ring. Then, cut a section of packing around the groove of the ring and tighten the nut of the pressing part so that one end of the nut is pressed on the ring. This method only needs the pre-processing work piece, the post-installation workload is small. Ideal for centrifugal fans with unnecessary sealing requirements.
