Proper Use Of Vacuum Pump
The working pressure of the diaphragm vacuum pump shall meet the requirements of the ultimate vacuum and working pressure of the vacuum equipment. For example, a vacuum drying process requires a working vacuum of 10mmHg, and the ultimate vacuum of the selected diaphragm vacuum pump should be at least 2mmHg, preferably 1mmHg. Generally, the ultimate vacuum of the selected pump is half to an order of magnitude higher than the operating vacuum of the vacuum equipment.
Correctly select the operating point of the diaphragm vacuum pump. Each pump has a certain working pressure range, such as 2BV series water ring diaphragm vacuum pump working pressure range of 760mmHg~25mmHg(absolute pressure), in such a wide pressure range, pump pumping speed changes with pressure (refer to the pump performance curve for detailed changes), its stable working pressure range of 760~60mmHg. Therefore, the pump operating point should be selected in this range is more appropriate, and can not let it in 25~30mmHg long-term work.
The diaphragm vacuum pump in its working pressure should be able to discharge all the gas produced in the process of vacuum equipment.
Properly combine the diaphragm vacuum pump. Because the diaphragm vacuum pump has selective extraction, so, sometimes choose a pump can not meet the requirements of extraction, several pumps need to be combined, a mutual supplement to meet the requirements of extraction.
If the titanium sublimation pump has a high pumping rate for hydrogen but no helium, and the tripole sputtering ion pump (or the bipolar asymmetric cathode sputtering ion pump) has a certain pumping rate for argon, the combination of the two will make the vacuum device get a better vacuum. In addition, some diaphragm vacuum pumps can not work under atmospheric pressure, the need for pre-vacuum; Some diaphragm vacuum pump outlet pressure is lower than atmospheric pressure, the need for a pump, so need to use the pump combination.
Requirements for the oil pollution of vacuum equipment.If the equipment strictly requires no oil, should choose a variety of no oil pump, such as a water ring pump, molecular sieve adsorption pump, sputtering ion pump, cryogenic pump. If the requirements are not strict, you can choose to have the oil pump, with some anti-oil pollution measures, such as cold trap, baffle, oil trap, which can also meet the requirements of a clean vacuum.
Know the composition of the extracted gas, whether the gas contains condensable vapor, whether there is particle dust, whether there is corrosiveness, etc. When choosing a diaphragm vacuum pump, it is necessary to know the gas composition and select the corresponding pump for the pumped gas. If the gas contains vapors, particles, and corrosive gases, consider installing auxiliary equipment such as condensers, precipitators, etc. on the inlet line of the pump.