Application And Use Notes Of Anti-Corrosion Diaphragm Vacuum Pumps In Laboratory
Vacuum refers to a gaseous space with a pressure of less than 101.3kPa. Any device that can draw gas from the container to reduce the gas pressure can be called an anti-corrosion diaphragm vacuum pump. This kind of pump has a steel cylindrical stator. In the stator, there is an eccentric steel solid cylinder as the rotor. The diameter of the rotor is embedded with a sliding plate with a spring. When the motor drives the rotor to rotate, the sliding plate is in the cylindrical shape.
The pump cavity is divided into two areas, and its volume periodically expands and shrinks. After the gas container to be pumped is connected to the air inlet of the pump, when the pump chamber space increases, the gas to be pumped is sucked in. As the rotor rotates, the gas is compressed and discharged from the air outlet.
The rotor continuously rotates, the process of suction, compression, and exhaust is repeated continuously, the gas in the container is continuously reduced, and the air pressure is continuously reduced. The whole machine is immersed in a tank containing lubricating oil. The vapor pressure of the lubricating oil is very low. It plays the role of lubrication, sealing, and cooling.
Anti-corrosion diaphragm vacuum pumps are mainly used in the following aspects in the lab
1. The vacuum drying vacuum pump is connected to the drying box, and the sample can be removed from the sample at a lower temperature in the vacuum drying box and the moisture and the high boiling point impurities that are difficult to volatilize, so as not to decompose the sample at high temperature.
2. Vacuum distillation or reduced pressure distillation can reduce the boiling point of the material and make it steam at a lower temperature. It is suitable for the steaming of organic matter that is easy to decompose at high temperatures.
3.Vacuum filtration: for special materials that are difficult to filter, vacuum filtration can speed up the filtration speed.
4. Others can also be used for tests that require a vacuum.
1. Check whether the oil level in the pump is at the marked line of the oil hole before starting up. If the oil is too much, the gas will splash outward from the exhaust hole during operation; if the oil is insufficient, the pump body cannot be completely immersed, and the sealing and lubrication effect will not be achieved, which will damage the pump body.
2. Anti-corrosion diaphragm vacuum pumps are driven by a motor, and the power supply voltage should be consistent with the voltage required by the motor during use. For a three-phase motor, remove the belt before powering on and check whether the direction of rotation of the motor is consistent. Do not reverse the motor and cause the pump to spray out. After checking, connect the belt again.
3. Do not pump condensable vapor directly.
4. Pay attention to the temperature of the motor during operation, and it should not exceed the specified temperature. There should be no friction and metal impact. If there is any abnormality, stop the machine and ask a professional for repair.
5. Before stopping the pump, the air inlet of the pump should be vented to the atmosphere and then the power supply should be cut off to prevent the pump oil from returning pressure to the air extraction system. To this end, a three-way piston is connected to the air inlet, and the three-way piston is placed in a position that not only keeps the system in a vacuum but also vents the pump body to the atmosphere before stopping.
6. The fine gauze net at the air inlet should be cleaned regularly to prevent small solid particles from falling into the pump and damaging the pump body.