Vacuum pump operation instructions

1. Check the oil level, to stop the pump filling oil to the oil standard center is appropriate. Too low on the exhaust valve can not play the role of oil seal, affect the vacuum degree. Too high, may cause the start of air injection. It is normal for the oil level to rise during operation. Oil mining
Add clean vacuum pump oil of specified brand through the filling hole. After refueling, screw a screw plug. Oil should be filtered to avoid sundries into the oil hole.
2. The 2XZ vacuum pump can be started at the next time through the atmosphere or at any vacuum level. If the pump port is installed with solenoid valve, it should be operated simultaneously with the pump.
3. When the ambient temperature is too high, the temperature of the oil increases, the viscosity decreases, and the saturated vapor pressure increases, leading to a decrease in the limiting vacuum, especially the total pressure measured by the thermocouple. Limit vacuum can be improved by strengthening ventilation and heat dissipation, or improving oil pump performance.
4. Check the limit vacuum of model 2XZ rotary vane vacuum pump with the compressed mercury vacuum gauge as the standard. If the gauge is fully pre-checked, the pump temperature reaches stability, the pump port is directly connected with the gauge, and the limit vacuum will be reached within 30 minutes after operation. The value measured by the total pressure meter is related to the pump oil and vacuum gauge, and the regulatory error, sometimes the error can be very large, only for reference.
5. If the relative humidity is high, or the extracted gas contains more condensible steam, open the air ballast valve after connecting the pumped container, and close the air ballast valve after running for 20 ~ 40 minutes. Before stopping the pump, open the air ballast valve for no-load movement for 30 minutes to extend the pump oil life.
6. Choice of vacuum pump oil: the viscosity of the pump oil affects the starting power and the ultimate vacuum of the pump. When the viscosity is high, the vacuum degree is favorable, and the starting power is larger. The saturated vapor pressure of the oil at pump temperature will affect the ultimate total pressure of the pump, the lower the better. The viscosity of high speed vacuum pump oil and 3# diffusion pump oil is higher than that of no. 1 vacuum pump oil, and the saturated vapor pressure is lower than that of no. 1 vacuum pump oil, but the price of 3# diffusion pump oil is higher. Specific choose what oil, according to the above introduction combined with specific requirements to choose.
(1) in general, high speed vacuum pump oil produced in Shanghai is applied where the total pressure is expected to be above 6x10-2 pa. Small pump below 4 l/s can also be replaced by no. 1 vacuum pump, direct pump above 8 l/s can be replaced by no. 3 diffusion pump.
(2) if the vacuum degree is not high, and the pollution of oil is changed frequently, and the supply of vacuum pump oil is difficult, no. 50 mechanical oil can be used instead.
(3) if the ambient temperature is low, it is difficult to start, and the limit vacuum requirement is not high, zhenzhai pump oil or mechanical oil with slightly lower viscosity can be used
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