Tools required for 1:
Diesel oil, brush, feeler gauge (250mm), pull claw (can be made by oneself), hammer (big and small hammer), copper rod, chrome plating automatic painting, impeller grinding tool (electric grinding).
Adjustment principle:
The clearance adjustment structure between the impeller end face and the end cover of 2. Roots blower is characterized in that a wave spring is arranged between the outer ring of the bearing and the end cover, the wave spring is in a compressed state, the impeller shaft is matched and connected with the bearing, the end of the end cover is provided with a tightening nut, and the tightening nut is pressed on the outer end face of the outer ring of the bearing, so that when the tightening nut is screwed in or out, the bearing is under the elastic force of the wave spring, the impeller shaft is driven to move axially to adjust the gap between the end face of the impeller and the end cover.
how to adjust the roots blower clearance:
1. Use feeler gauge to determine the gap between impeller and impeller
2, the impeller and the body by processing guarantee
3, the impeller axial clearance to adjust the gasket, determine the gap
Reference data (search notes):
The clearance between the impeller and the impeller is 0.4-~ 0.5mm, the radial clearance between the impeller and the blade shell is 0.2-0.3mm mm, the axial clearance between the impeller and the left and right wall plates is 0.3-0.4mm mm (the clearance between the left wall plate must be more than 0.05mm larger than the clearance between the right wall plate), and the meshing clearance of the synchronous gear is 0.08-0.16mm. The adjustment of the working clearance of the fan is the most critical and difficult step in the whole maintenance process of the Roots fan. Carefully study the structural principle of the Roots fan and analyze the position of the impeller at 45 degrees during the rotation of the impeller (when the pressure angle of the impeller is 45 degrees from the horizontal line, the clearance between the two impellers is the most critical clearance between the two impellers, in addition, there are two 45 ° and two -45 ° positions. In these positions, the maximum axial section of the two impellers is just in a relatively parallel state (when adjusting and measuring the gap, it can be determined whether the two impellers are in the position of 45 °). During the normal operation of the fan, along with the wear and tear, the clearance at the 45 ° position will change accordingly. The clearance at the 45 ° position tends to decrease, while the clearance at the -45 ° position tends to increase. When the normal wear and tear to a certain extent (under good maintenance, generally should be in continuous operation for more than 7 to 8 years), the two impellers will collide, and the first collision site is at 45 °. Therefore, when adjusting the working clearance of the two impellers, the clearance at the 45 ° position should be appropriately increased in advance, generally to 2 times of the -45 ° position (assuming a 45 ° time gap is a, then 2a at 45 °). Another approach is to directly adjust the gap at a 45 ° position to 0.4~0.5mm or less (the gap at -45 ° has a certain influence on the air volume, and the air volume decreases when the gap is large). After adjustment, stagger from the original position and rehinge the positioning pin hole. The clearance between the impeller and the left and right wall panels can be adjusted by increasing or decreasing the gasket at the bearing end cover. The gap between the impeller and the casing and the meshing gap between the synchronous gears are not adjustable. Measurement records shall be made during maintenance, including relevant data of parts before and after repair and replacement.
