First, an overview of the vacuum pump is one of the most commonly used laboratory equipment, often require a higher degree of vacuum occasions. The performance of the vacuum pump depends on the structure of the pump and the quality of the oil (the lower the vapor pressure of the oil the better), a good vacuum pump can be pumped to a vacuum of 10 ~ 100Pa. The more precise structure of the pump, the higher the requirements of the working conditions. Second, steps will be around after the catheter is connected, open the switch can be. Third, the matters needing attention (1) The choice of vacuum pump should be compatible with the conditions of use, such as vacuum, pumping rate, power supply voltage is appropriate. (2) The vacuum pump should be placed in a clean and dry place. To regular cleaning and oil change. Cleaning should use kerosene or straight-run gasoline, wash the parts should be wiped dry or dry with a hair dryer. Apply a clean vacuum pump oil change, if replaced with other oils will seriously affect the degree of vacuum. (3) Vacuum system and piping connected to the pump should be short, thick, and minimize joints. All joints should be strictly sealed to ensure that will not leak. (4) was pumping gas temperature is higher than 40 ℃, gas cooling device should be added. If with droplets, condensate dehumidification device should be added. If the gas to be drawn is corrosive or chemically react with the oil, an absorption and neutralization device should also be added. (5) Check whether the rotation direction of the motor is correct before opening the pump (check the rotation direction, the transmission belt should be removed first, so as to avoid the motor reverse when the oil spouts), the lubrication system is reliable, the amount of oil is appropriate. (6) vacuum pump oil temperature during operation shall not exceed 75 ℃, nor can there be noise and vibration, or should be shut down for maintenance. (7) stop the pump should close the valve connected to the vacuum system, and open the bleed valve to prevent the pump oil is sucked back to the vacuum system, and then cut off the motor power. (8) vacuum pump shall not be used to pump low boiling point liquid, therefore, the pumping system should be used to pump low-boiling point solvent before using the vacuum pump.
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