Roots blower is a positive displacement power machine. Two impellers are driven by a pair of synchronous gears to rotate in the opposite direction. The intake and exhaust ports are separated by the "meshing" of the impeller profile (there is a certain gap between impellers, and they do not contact each other), and the inhaled gas is pushed from the suction port to the exhaust port without internal compression. When the inhaled gas is transported to the exhaust port, Work is done because the high-pressure gas at the discharge side is pressurized and transmitted to the system. The periodic suction, exhaust and instantaneous constant volume compression cause the pulsation of gas flow velocity and pressure, which will produce large aerodynamic noise.
Adjustment of casing clearance: it is ensured by the locating pin hole between the casing and the wallboard, because the locating pin hole must not be damaged when disassembling the fan. Adjustment of impeller impeller clearance: turn the impeller to the clearance schematic position, align the driven gear with the driving gear mark and press it onto the shaft, successively install the gear retainer ring, stop washer and lock nut, and slightly tighten the lock nut. Try to rotate the impeller for one circle. If it can't rotate, rotate the impeller to make the contact point on the top. Tap the impeller clearance with a copper bar to make the cone of gear and shaft move relatively, so as to adjust the impeller clearance. When the impeller impeller clearance meets the specified value, lock the gear.
Adjustment method
（1） Cleaning
1. Remove the inlet and outlet pipelines of roots blower, remove the acid mud and sundries in roots blower, and seal the lower inlet with blind plate.
2. Remove from the upper part of Roots blower and add 13% Na2CO3 aqueous solution until the rotating impeller does not overflow, and properly rotate the Roots blower impeller to neutralize the acid in the blower. After 10~20 minutes, remove the lower blind plate to discharge the solution, and then repeatedly clean it twice according to this method. Finally, clean the Roots blower with clean water.
3. Lift out the impeller in time, remove the dirt and sundries in the Roots blower, two impellers and labyrinth seal, wipe the Roots blower clean, and then wipe the wetted parts with antirust oil to prevent rust.
4. Lift the two impellers into the fan base and press the bearing boxes at both ends with two glands.
（2） Measurement
Adjust the two impellers to one side of the coupling at the same time with the adjusting screw to make the clearance between the two impeller end faces and the coupling side reach normal (about 0.4~0.5mm). Turn the two impellers and check whether the four sets of labyrinth seal components are in normal position. If not, record the size for proper processing or treatment when removing in the future.
Measure the clearance between the protruding parts of the two impellers and the cambered surface of the base of Roots blower, measure the clearance between the protruding parts of the two impellers and the other impeller, measure the clearance between the end faces of the two impellers and the internal facades on both sides of the base, mark and record the above measurement positions.
Press the cover plate tightly, measure the gap between the convex position of the two impellers and the inner cambered surface of the cover plate, measure the gap between the two sides of the cover plate and the two sides of the two impellers, and mark and record them respectively.
（3） Repair
1. Studded strip
(1) 12 convex strips shall be processed according to the size. The material is determined according to the contact medium when Roots blower is used. If it contacts with acid, it is recommended to use acid resistant materials of certain strength, such as stainless steel. The following processing materials are the same.
(2) Mill dovetail grooves and drill holes at 4 convex positions of two impellers according to size.
(3) Machine 36 bolts and 36 matching nuts according to the size.
(4) Insert every three convex strips into four dovetail grooves of the impeller, and fasten them with bolts processed according to (3). If any part is too tight during installation, it can be polished with portable grinding wheel.
2. Inlaid end face
(1) Drill 12 bolt holes in the direction of two impellers near the gear according to the size.
(2) The end face inserts of two impellers in the direction of gear shall be processed according to the size, and a total of 4 pieces shall be processed (it is recommended that the inserts be inserted into the impellers and then drilled).
(3) Three kinds of fastening insert bolts shall be processed according to the size, 8 of each type, and 24 matching nuts shall be purchased or processed (nuts shall be processed according to common standards).
(4) Install the inserts into the end faces of the two impellers in the direction of the gear, and fasten them with the bolts processed according to (3).
I believe that after reading the above contents, you should also understand the adjustment method for excessive clearance of Roots blower. I hope it will be helpful to you.
Text label: Roots blower
Link to this article: //wuhanzhcs.com/html/news/n02/707.html
