Roots vacuum pump, as its name implies, is a kind of vacuum pump that uses mechanical energy to achieve no internal compression. Therefore, the requirement of vacuum degree is relatively high. If the phenomenon of vacuum degree is not high enough, it is necessary to check the product, find out the cause of the failure and correct it.
1. The temperature of the vacuum pump is too high: if the temperature of the pumped gas is too high, the gas should be cooled before entering the vacuum pump; the cooling water or electric fan should be used to cool down, and the clearance of the relevant parts should be checked and repaired or replaced according to the required accuracy.
2. Inhale hard material to wear the vacuum pump body: Roots vacuum pump should be disassembled to remove hard material, and scratched parts should be repaired or replaced.
3. The cooling water flow of vacuum pump is insufficient: the cooling water flow should be increased.
4. The improper assembly causes the displacement of the rotor axis and causes one-sided wear and tear: it should be disassembled, inspected and reassembled.
5. Roots Vacuum Pump Leakage: the pump itself is not tightly sealed, leaking in the shaft seal, should replace the valve piece; Seal ring leakages, should check the sealing situation of all sealing parts, replace the damaged seal ring; Ballast valve gasket damaged or not tightened, should replace the gasket and tighten the air ballast valve; Vacuum pump in the diaphragm pressure when the interference amount. The vacuum pump chamber should be repaired or replaced if it is too large to cause the vacuum pump chamber to deform and leak. The end cap should be removed to check whether there is any debris or unevenness, and clean or repair the vacuum pump chamber because of the leakage caused by the bad oil seal on the end face of the vacuum pump.
6. The clearance between the rotor and the rotor or the rotor and the shell is too large, and the air temperature is too high: if it is a wet pump, cold water can be injected into the intake, and if it is a dry pump, a cooler is added into the outlet to reduce the air temperature.
7. The pressure difference between the inlet and outlet gas media of the pump is too large: if the dry pump needs to check whether the safety valve is malfunctioning, if the malfunctioning outlet pressure may be too high, if the wet pump is too high, or the outlet water seal pressure may be too small or the outlet pipe diameter is too small, the elbow is too large and the outlet resistance is increased, which should be eliminated according to the actual situation.
8. Vacuum pump oil has problems: low oil level should be increased to the center line of the oil mark; new oil should be replaced when oil is contaminated and oil quality deteriorates; the brand of oil is not in conformity with the specified brand of vacuum pump oil; the oil pipeline is not open, Roots vacuum pump chamber does not maintain appropriate oil volume, oil pipeline and valve should be checked to maintain oil intake. The road is clear.
9. Deformation or breakage of the rotor spring and inadequate action of the rotary blade: the spring deformation should be repaired or replaced to make the rotary blade fit well. 10. The filter screen of the intake is blocked. The filter screen should be removed and cleaned, and then installed.
In addition, poor processing or abrasion of Roots vacuum pump will cause excessive matching clearance, which will also lead to insufficient vacuum. At this time, the matching clearance between vacuum pump chamber, rotor, rotary blade and end cover plate should be checked, and the required accuracy requirements should be put into repair or replacement.