The heating of Roots blower generally means that the overall casing temperature is too high due to too high exhaust temperature, and the oil tank temperature is too high due to too high bearing temperature and lubricating oil temperature. 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). Therefore, the increase of compression ratio will lead to the increase of exhaust temperature,
When the high-pressure roots blower is shut down, slowly open the exhaust valve to fully open. Press the stop button on the electric cabinet. Check the belt tension of high-pressure roots blower and the deviation of pulley. Check whether all instruments are normal, and inform the maintenance personnel to replace them in case of any abnormality. High pressure Roots blower is a volumetric compressor, which can change the flow and shaft power by adjusting the speed. The pressure gauge switch is in the normally closed state. If you need to measure the pressure, you can open the pressure gauge switch. Before pressing the start button, be sure to check whether the outlet valve of the operating fan is open, and the fan pressing the start button is consistent with the marked direction.
When the high-voltage roots blower needs to operate at power frequency, it is necessary to turn the corresponding fan switch on the electric control box to the power frequency position, then press the start button, and turn the switches of other fans and frequency converters to stop. After the fan operates normally, close the exhaust valve slowly to avoid burning the motor due to excessive instantaneous current of the fan due to too fast closing. Adjust the air inlet valve contacting the oxidation tank during operation to ensure uniform aeration.
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;
Causes of high pressure roots blower being too hot:
1. Whether inhaled or discharged, you should keep steady. When the terminal outlet diameter and outlet diameter are small, the outlet closes and the temperature rises.
2. Time of high-pressure roots blower. The fan has been installed for a long time and the temperature is too high.
3. When the high-pressure roots blower is running, the temperature rise is not large. When the temperature exceeds the indicated working pressure range, the temperature will rise. It is normal unless the temperature of the motor is hot. The compressed air of the high-pressure roots blower impeller forms a higher pressure and generates more heat during operation. The outlet temperature is also higher than the atmospheric temperature. The higher the air pressure of high-pressure Roots blower, the higher the heat generated, the higher the motor power and the higher the temperature.
Text label: Roots blower
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