The reasons that affect the vacuum tightness in operation are mainly manifested in the shaft seal pressure, the water level of the shaft seal heater and the secondary leakage of the shaft seal. Determine the best shaft seal pressure. If the pressure of the shaft seal is too large, the clearance is too small, and the shaft seal is too hot and too low; if the pressure of the shaft seal is too small, the gap is too large, and the steam leakage of the shaft seal is too large, which also affects the working efficiency of the vacuum pump unit.
In order to ensure the optimal shaft seal pressure of vacuum pump unit, the steam supply pressure of shaft seal formed by self sealing of shaft seal system under minimum stable combustion load and high load is 45kpa, which can meet the pressure of low-pressure seal shaft seal and reduce water inflow in oil as much as possible. Monitor the water level of the shaft seal heater, adjust it in time in case of any abnormality to ensure that the water level of the shaft heater is normal. Remove the shaft heater without water level or the water level is too low, resulting in the decrease of vacuum tightness。
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