oil-free vacuum pump purchase

Now technology drives product innovation, and the performance of oil-free vacuum pump products has been greatly improved, which is loved by many industries. However, when purchasing oil-free vacuum pump, you can’t choose manufacturers at will. What do you need to pay attention to when purchasing oil-free vacuum pump? The working pressure of oil-free vacuum pump should meet the limit vacuum and working pressure requirements of vacuum equipment. For example, a vacuum drying process requires a vacuum degree of 10mmhg, and the limit vacuum degree of the oil-free vacuum pump should be at least 2mmhg

Generally, the limit vacuum degree of vacuum pump is 0.5 to 1 order higher than that of vacuum equipment. Correctly select the operating point of oil-free vacuum pump. Each type of vacuum pump has a fixed operating pressure scale, such as: the operating pressure scale of oil-free vacuum pump is 760mmhg ~ 25mmhg (absolute pressure). In such a wide pressure scale, the pumping speed of the pump varies with the pressure (refer to the function curve of the pump for detailed changes).

Therefore, the operating point of the vacuum pump should be selected within this scale rather than long-term operation at 25 ~ 30mmhg. Compared with oil pump, oil-free vacuum pump has low vacuum degree and small air extraction capacity, but it is small in size, easy to install, easy to maintain, convenient to move, does not pollute the environment, does not produce lampblack, especially in the laboratory with higher requirements. It is also one of the equipment in the laboratory.

The ambient temperature of oil-free vacuum pump should be less than 40 ℃ and the temperature rise of motor should not exceed 75 ℃. After 1000 hours of normal operation of the vacuum pump, it is necessary to remove and check the wear condition of the bearing and the end face moving ring, and replace the vulnerable parts that can not be reused. As for the medium that is easy to precipitate and crystallize, the vacuum pump should be cleaned immediately after use to drain the liquid in the pump.

Oil free vacuum pump is widely used in vacuum distillation, evaporation, crystallization, dryness and filtration in petroleum, chemical, food and pharmaceutical fields. Characteristics of oil-free vacuum pump: the wear rate of moving parts is reduced by 100 times, and the service life of gas valve is improved by 50 times. The S-wave poor vibration and low noise are reduced.

Therefore, when purchasing the oil-free vacuum pump, the vacuum degree required to work must be determined first. If the demand is high, the vacuum pump selected should be higher than the required vacuum degree. Otherwise, the vacuum pump can not meet the requirements of vacuum pumping, and the working requirements will not be met. The other is the pumping rate of oil-free vacuum pump, which should be slightly higher than the required pumping rate, so as to better meet the needs. Finally, see whether the extracted gas is corrosive. Corrosive gas will corrode the pump, so special materials must be used to meet the demand.