Working Principle and Classification of Vacuum Pump in Vacuum Drying Oven
1, The working pressure of the vacuum pump should meet the limit vacuum and working pressure requirements of the vacuum equipment, and the best value of the vacuum degree of the selected vacuum pump is 133pa=-0.1 mpa. Usually, the vacuum degree of the selected pump is half to an order of magnitude higher than the vacuum degree of the vacuum equipment.
2, Correctly select the working point of the vacuum pump. Each pump has a certain operating pressure range.
3, The vacuum pump under its working pressure, should be able to discharge all the gas generated in the process of vacuum equipment.
4, Correctly combine the vacuum pump. Because the vacuum pump has selective pumping, sometimes a pump can not meet the pumping requirements, and several pumps need to be combined to complement each other to meet the pumping requirements, such as titanium sublimation pump has a high pumping speed for hydrogen, but can not pump helium, and the three-pole sputtering ion pump, (or bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, the combination of the two, It will make the vacuum device get a better vacuum degree. In addition, some vacuum pumps can not work at atmospheric pressure, need pre-vacuum; Some vacuum pump outlet pressure is lower than atmospheric pressure, the need for the front pump, so it is necessary to combine the pump to use.
5, Vacuum equipment for oil pollution requirements. If the equipment is strictly required to be oil-free, a variety of non-oil pumps should be selected, such as: water ring pumps, molecular sieve adsorption pumps, sputtering ion pumps, cryogenic pumps, etc. If the requirements are not strict, you can choose to have a oil pump, plus some anti-oil pollution measures, such as cooling trap, baffle, oil trap, etc., can also meet the clean vacuum requirements, our company's vacuum drying oven selection is rotary vane oil pump, its main characteristics: large force, fast speed, high efficiency.
6, Understand the composition of the gas being pumped, whether the gas contains condensable steam, whether there is particulate dust, whether there is corrosion, etc. When selecting a vacuum pump, you need to know the gas composition, select the appropriate pump for the gas being pumped. If the gas contains steam, particles, and corrosive gases, it should be considered to install auxiliary equipment on the pump inlet line, such as condenser, dust collector, or liquid water filter.
7, What is the impact of the oil steam discharged from the vacuum pump on the environment? If the environment is not allowed to have pollution, you can choose an oil-free vacuum pump, or exhaust the oil steam to the outside.
8, Whether the vibration generated by the vacuum pump during operation has an impact on the process and the environment. If the process does not allow, should choose non-vibration pump or take anti-vibration measures.
9, The price of vacuum pump, operation and maintenance costs.
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