First, oil for vacuum pumps the use of environmental instructions
The vacuum pump is extremely poor in use in the cleaning line, and is exposed to high temperatures and moisture, and the vacuum required in use is high (generally 6-8 mbar).
Second, the use of vacuum pumps
In the environment where the cleaning line is extremely poor:
(1) Because the internal seal of the vacuum pump ages quickly.
(2) Because the water vapor vacuum pump oil will be emulsified quickly, although the pump oil and oil filter are often replaced, the vacuum pump oil cannot fully exert its lubrication, sealing and cooling effects, resulting in a decrease in vacuum and a quick bearing damage.
(3) Because the gas ballast valve of the water vapor vacuum pump must be opened to remove water vapor, the vacuum pump load is increased and the vacuum degree is also poor (the ultimate vacuum is 0.08 mbar when the gas ballast valve is closed, and when the standard gas ballast valve is opened) The ultimate vacuum is 0.7 mbar).
(4) Because the required vacuum degree of 6-8 mbar and the pump opening gas pressure ball valve are close to the ultimate vacuum of 0.7 mbar, the requirements for the vacuum line are very high (leak-proof), and once the degree of vacuum is reduced as shown in (1) (2), affect production.
Vacuum Pump Oil
Three, Maintenance of vacuum pump
Under the general good use environment, the vacuum pump runs (9 hours per day) for about 4 years. According to the domestic operation (24 hours a day), it will be about 1.5 years. In a poor environment, time should be reduced according to circumstances. However, the use of vacuum 6-8 mbar and pump limit vacuum 0.7 mbar is very close, after overhaul and maintenance, vacuum pump limit vacuum is difficult to restore to the new pump level. According to our company’s many years of maintenance experience, about 60% of the vacuum pump after overhaul can not meet the use requirements.
Four, Replacement of vacuum pump
The vacuum pump used in the cleaning line is generally recommended to replace the new pump after 1.5 years of use. After the overhaul of the old pump, it is suggested to move to other environments with low vacuum requirements. The type of pump is mainly determined by the amount of air, vacuum or exhaust pressure needed for the pump to work. The following two aspects should be noted:
As far as possible in the high efficiency zone, that is, in the critical vacuum or critical exhaust pressure zone.
2, avoid operating near the maximum vacuum or maximum exhaust pressure. The operation in this area is not only inefficient but also unstable. It is prone to vibration and noise. For the vacuum pump with higher vacuum degree, cavitation often occurs when it operates in this area. The obvious sign of this phenomenon is noise and vibration in the pump. Cavitation can cause damage to parts such as pump body and impeller, so that the pump can not work.
2SK Liquid Ring Vacuum Pump
According to the above principles, when the vacuum required by the pump or gas pressure is not high, can be preferentially selected in the single-stage pump. If the vacuum or exhaust pressure is high, the single-stage pump often can not meet, or, in higher vacuum conditions, the pump is still required to have a larger air volume, that is, the performance curve in higher vacuum is flat, can choose two-stage pump.
If the vacuum requirement is above -710 mm Hg, water ring-air pump or water ring Roots vacuum unit can be selected as the vacuum device. After selecting the type of vacuum pump according to the required air volume of the system, the type of vacuum pump should be selected according to the required air volume of the system.