1、 Usage requirements
1. The inlet air temperature of the conveying medium shall not exceed 40 ℃.
2. The particle content in the medium shall not exceed 100mg m3, and the maximum particle size shall not exceed half of the minimum working gap.
3. During operation, the bearing temperature shall not be higher than 95 ℃, and the lubricating oil degree shall not be higher than 65 ℃.
4. The operating pressure shall not be higher than the pressure rise range specified on the nameplate or the pressure rise range specified in the performance table of this manual. 5. The clearance between fan impeller and casing, impeller and impeller has been adjusted when leaving the factory, and the clearance shall be ensured when reassembling. (Too large clearance will affect the performance. Too small clearance will cause friction and collision due to thermal expansion.)
6. When the blower is running, the oil level of the main oil tank and auxiliary oil tank must be between the two meridians of the oil level gauge.
2、 Performance range
The suction flow in Roots blower performance refers to the suction flow when the suction pressure is standard atmospheric pressure, the suction temperature is 20 ℃, and the carrier is clean air. (When the blower transports special gas, the suction flow shall be converted according to the molecular weight of the conveying medium, inlet temperature and inlet and outlet pressure.
3、 Operation method
（1） Operation preparation
1. Thoroughly remove the dust and sundries inside and outside the machine, and avoid mixing with oil.
2. Check whether the connection part of the inlet and outlet is firm, whether the supporting parts of the piping are complete, and whether the installation of fans and cooling water pipes that need cooling water meet the requirements.
3. If there are welding slag and iron filings in the piping, they should be completely removed.
4. Return the lubricating oil to the upper line of the two oil level lines (the oil level will drop slightly after the blower runs). If the oil is injected too little, the gear and bearing will be burned; Excessive oil injection will often cause high temperature rise and damage to gears and other parts. The lubricating oil generally adopts the kinematic viscosity 220 full loss system oil.
5. Oil shall not be added during fan operation. The oil shall be replaced for the first time after one week of operation and for the second time after one month of operation. In the future, the lubricating oil of the main and auxiliary oil tanks shall be replaced on schedule.
6. Turn the fan coupling along the rotating direction by hand to check whether there is any abnormality.
（2） Test run
1. Open the valves at the inlet and exhaust sides, switch on the power supply under no-load condition, and verify the rotation direction. The fan requiring cooling water can be started only after the cooling water is connected.
2. After starting, run for 20-30 minutes without load to check for abnormal vibration and heating. In case of any abnormality, stop the vehicle immediately to find out the cause. Most of the abnormalities are caused by poor installation or misalignment of the coupling, as well as other conditions such as improper lubricating oil level.
3. Then, operate under normal load for 2-3 hours, and observe the temperature and vibration of each component at the same time.
4. Attention shall be paid to the indication of the ammeter during operation. In case of any abnormality, the machine shall be stopped immediately for inspection. Most of the causes are caused by the friction of the impeller.
（3） Precautions during operation
1. During operation, the temperature of bearing and lubricating oil, and the indication of ammeter must be checked frequently. When the fan needs cooling water, check whether the cooling water volume meets the specified requirements. When the fan is sealed with packing, the leakage of the seal should also be checked. When the leakage is serious, the seal should be replaced immediately to avoid safety accidents caused by dangerous gas leakage, and the leakage of corrosive gas will also damage the bearing.
2. Check regularly and make records.
3. When parking, it is necessary to first unload and then stop. In case of improper operation, shutdown with load or shutdown due to sudden power failure, the high-pressure gas in the system at the outlet side of the fan will quickly flow to the inlet side of the low fan (commonly referred to as "backflow"), thus causing the high-pressure gas to drive the fan impeller to accelerate the reflection operation, and the fan impeller speed is getting higher and higher. When the impeller speed reaches its limit speed, it will cause the impeller to collide with the casing A vicious accident of smashing. In particular, users transporting flammable and explosive gases such as fertilizer plants should operate strictly, because when the fan impeller is damaged, more dangerous accidents such as explosion and fire will often occur.
maintenance and overhaul
1、 Routine maintenance
1. During operation, special attention shall be paid to: whether there is friction or foreign matter inhalation between the impeller inside the casing and the casing, between the impeller and the wallboard, between the impeller and the impeller. Frequent inspection shall be carried out. If the friction is serious earlier, the local temperature rise of the casing will be too high, and the surface paint will be burnt. At this time, the machine shall be stopped immediately.
2. In daily work, attention should be paid to the temperature, vibration and running sound of bearings, and regular inspection should be carried out.
3. During long-term operation, due to the corrosion of impeller and casing, the working clearance increases, the leakage in the blower increases, the casing temperature rises, the exhaust temperature increases, and the fan flow decreases. At this time, stop the machine to measure the clearance and take corrective measures.
4. In cold areas in winter, after the blower requiring cooling water is shut down, the cooling water must be discharged to prevent the stored water from freezing and damaging the machine.
2、 Regular inspection
1. Daily inspection
(1) Check the oil level. Too much or too little lubricating oil will damage the bearing.
(2) Check the temperature of main and auxiliary oil and bearing parts.
(3) Check the suction and discharge pressure to confirm whether the fan operates normally.
(4) Check the motor load. If the motor load increases, it indicates that there is some abnormal condition, and the reason should be found out.
(5) Check the sealing effect of packing.
2. Three month inspection. Replace the lubricating oil in the main and auxiliary oil tanks, and clean the air filter.
3. Semi annual inspection. Check the fan duct support. The packing seal fan shall be checked for seal leakage.
4. One year inspection
(1) Inspect the rotary shaft lip seal.
(2) Check the impeller and the inside of the casing, and check the clearance of each part.
(3) Check the gear
(4) Check the motor load. If the motor load increases, it indicates that there is some abnormal condition, and the reason should be found out.
(5) Check the sealing effect of packing. 2. Three month inspection. Replace the lubricating oil in the main and auxiliary oil tanks, and clean the air filter.
