Classification of common faults of Roots blower and introduction of solutions. As a worker in the water treatment industry or an aquaculture farmer, you should be familiar with Roots blower. It is a kind of compressor and belongs to a constant volume rotary blower. Roots blower is often used in many fields, such as sewage treatment, aeration, aquaculture, and pneumatic conveying, Roots blower has many advantages. Although magnetic suspension blower and air suspension blower are gradually emerging, the application of Roots blower is still the mainstream.
Although Roots blower is tough, like many equipment, it needs careful care. If it cannot be used or maintained correctly, it is also prone to failure. The following common failures of Roots blower are briefly classified, such as friction between impeller and wallboard, impeller top and casing; Friction between impellers; Insufficient fan flow; The fan temperature is too high; The fan leaks oil or the oil leaks into the casing; Abnormal fan or vibration; For motor overload and other problems, we will analyze the causes of the fault one by one and give solutions by comparison. Please collect them for a rainy day.
1、 Causes and solutions of friction between impeller and wallboard, impeller top and casing:
1) Incorrect installation clearance between impeller and wallboard, impeller top and casing - readjust the clearance;
2) The operating pressure is too high and exceeds the specified value - find out the cause of overload and reduce the pressure to the specified value;
3) The operating temperature is too high;
4) The casing or base is deformed, and the fan positioning is invalid - check the installation accuracy to reduce the pipeline 5) Poor axial positioning of the tension bearing - check and repair the bearing and ensure the clearance.
Roots blower gear
2、 Causes and solutions of friction between impellers:
1) Contaminated impurities on the impeller, resulting in too small clearance - remove the dirt and check whether the internals are damaged;
2) Gear wear causes large backlash - adjust the gear backlash. If the gear backlash is greater than 30%~50% of the average value, replace the gear;
3) The gear is not firmly fixed and cannot keep the impeller synchronized - reassemble the gear to keep the taper fit contact area up to 75%;
4) The bearing wear causes the clearance to increase - replace the bearing.
3、 Causes and solutions for insufficient flow of Roots blower:
1) Inlet filter blockage - remove the dust and blockage of the filter;
2) The impeller is worn and the clearance increases too much - repair the clearance;
3) Belt slipping - tighten the belt and increase the number of belts;
4) Large inlet pressure loss - adjust the inlet pressure to reach the specified value;
5) Ventilation leakage caused by pipeline - inspect and repair the pipeline.
4、 Causes and solutions for high temperature of Roots blower:
1) Too much, too thick and too dirty oil in the oil tank - reduce the oil level or change the oil;
2) Filter or muffler blockage - remove the blockage;
3) Pressure higher than the specified value - reduce the pressure difference through the blower;
4) The impeller is excessively worn and the clearance is large - repair the clearance;
5) Poor ventilation and high indoor temperature cause high inlet temperature - open vents to reduce room temperature;
6) If the running speed is too low, the belt will slip - increase the speed to prevent the belt from slipping.
5、 Causes and solutions of fan oil leakage or oil leakage into the casing:
1) The oil tank is too high and leaks out from the oil drain - lower the oil level;
2) The seal is worn, causing oil leakage at the shaft end - replace the seal;
3) The pressure is higher than the specified value - reduce the pressure to the specified value;
4) The air vents of the wallboard and oil tank are blocked, causing oil leakage into the casing - dredge the air vent, install a plug with a hole diameter of 2mm in the middle chamber, and open the plug under the wallboard.
6、 Causes and solutions for abnormal or vibration of Roots blower:
1) The clearance of rolling bearing exceeds the specified value or the bearing seat is worn - replace the bearing or bearing seat;
2) Gear backlash is too large, misaligned, and not fixed tightly - reassemble the gear and ensure the backlash;
3) Impact between impeller and impeller, impeller and casing due to foreign objects and dust - clean the blower and check whether the casing is damaged;
4) Impeller collision caused by overload and shaft deformation - check the back pressure, check whether the impeller is aligned, and adjust the clearance;
5) Friction between impeller and casing inlet due to overheating - check the filter and back pressure, and increase the clearance between impeller and casing inlet;
6) The impeller is out of balance due to scale or foreign matter - clean the impeller and casing to ensure the working clearance of the impeller;
7) The foundation bolts and other fasteners are loose - tighten the foundation bolts and level the base.
7、 Causes and solutions of motor overload:
1) Compared with the specified pressure, the pressure difference is large, that is, the back pressure or inlet pressure is large—— Reduce the pressure to the specified value;
2) Compared with the flow required by the equipment, the flow of the fan is too large, so the pressure increases - discharge the excess gas or reduce the blower speed;
3) Inlet filtration is blocked, outlet pipeline is blocked or blocked - remove obstacles;
4) Collision and friction jamming of rotating parts - stop the machine immediately and check the cause;
5) The oil level is too high - adjust the oil level to the correct position.
6) Narrow V-belt is overheated, vibration is too large, pulley is too small - adjust pulley size.
The above is a summary of the common faults of Roots blower manufacturer. In actual operation, Roots blower is easily affected by the surrounding environment and service conditions, so it is very important to analyze the faults of the blower and deal with them in time. However, the faults are caused by many factors, so it is necessary to do a careful spot check on the blower at ordinary times, Timely find problems and deal with them. In general, as long as the user can carry out maintenance in strict accordance with the fan operating instructions, check and confirm the data according to the operating procedures, judge whether the equipment is normal, and timely repair when there is a fault that needs to be repaired, the long-term safe, stable and good operation of the equipment can be guaranteed, and the service life of the fan can be extended.
