Roots blower will generate heat under normal operation. As long as the heat is within a certain range, it is normal. If the oil pump of the blower is hot and the temperature exceeds 80 ℃, the blower may be overloaded and burn the motor. The exhaust temperature of Roots blower is positively related to the compression ratio (exhaust absolute pressure divided by inlet absolute pressure), and inversely related to the volumetric efficiency (actual flow divided by theoretical flow).
During the operation of the fan, the inner surface of the casing contacts the air flow. Although the air flow has heat, the outer surface of the casing generally does not overheat because it contacts the fan room or the cold air in the open air. Only when all the valves in the pipe network are closed, the fan will run for a long time, which will make the casing generate heat. At this time, stop the fan and wait for the casing to cool before starting.
1、 The inlet filter or inlet pipeline is blocked, the negative pressure increases, the inlet absolute pressure decreases, and the compression ratio increases; 2、 The outlet management blockage leads to the increase of exhaust absolute pressure and compression ratio; 3、 When the load is increased, the pressure rise will increase, so that the exhaust pressure will increase and the compression ratio will increase.
Therefore, the measures to reduce the exhaust temperature are: first, clean the inlet filter or remove the blockage in the inlet pipeline, check whether the inlet gate valve is closed or partially closed, and ensure that the inlet gate valve is fully opened; 2、 Remove the outlet pipeline blockage; Check whether the outlet gate valve is closed or partially closed to ensure that the outlet gate valve is fully opened. Third, reduce the pressure rise to the specified value and properly reduce the system load in summer.
The decrease of volumetric efficiency will lead to the increase of exhaust temperature, and the factors leading to the decrease of volumetric efficiency are the decrease of fan speed and the increase of fan internal clearance, because both of them will reduce the actual flow. Therefore, the measures to prevent the exhaust temperature from rising due to the reduction of volumetric efficiency are: first, tighten the belt to increase the speed; 2、 Repair the clearance, including adjusting the clearance, repairing the damaged impeller, casing, wallboard, etc.
Too high bearing temperature and lubricating oil temperature will cause heating of Roots blower oil tank. Too much lubricating oil, too thick and too dirty, and too much lubricating grease will increase the running resistance of bearings and gears, increase the heat generated by friction, and cause the oil temperature to rise and the oil tank to heat up. There is too little lubricating oil and grease, and the lubrication is insufficient. The bearings and gears will dry and burn, and the oil tank temperature will also rise. In addition, if the bearing fits too tightly and the gear mesh is too tight, the friction will increase, which will increase the friction heat and cause the temperature of the oil tank to rise. For those fans that use cooling water to cool the oil tank, pipeline blockage or insufficient water flow will also cause the temperature of the oil tank to rise. For the high temperature of the oil tank caused by the above reasons, the countermeasures are: first, adjust the amount of lubricating oil and grease to ensure that the lubricating oil and grease are adequate and high-quality; 2、 Assemble the bearing and gear; 3、 Ensure that the water cooling oil tank pipeline is unblocked and the water flow is moderate.
In addition, fan failure, such as friction between the impeller and the casing or wallboard, or friction between other components, may cause fan temperature rise; Poor indoor ventilation and high inlet air temperature will also lead to high fan temperature; The excessive dust and impurities in the casing may also increase the resistance of the fan system and raise the temperature. The solution is, of course, to eliminate the causes of friction, ensure good ventilation, normal inlet air temperature, and ensure that the impurities and dust in the casing are within the allowable range.
I believe that after reading the above contents, you should also have some understanding of the causes and solutions of Roots blower heating. I hope it will be helpful to you.
Text label: Roots blower
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