Precautions for using a rotary vane vacuum pump
When using a vacuum pump, there are some things to be aware of, and Shenyang Beizhen Vacuum will organize the following introduction for you.
The rotary vane vacuum pump is mainly composed of a pump body, a rotor, a rotary vane, an end cover, a spring and the like. A rotor is eccentrically mounted in the cavity of the rotary vane pump, the outer circumference of the rotor is tangent to the inner surface of the pump chamber (there is a small gap between the two), and two rotor blades are mounted in the rotor slot. When the rotor rotates, the rotary vane can reciprocate along its radial groove and is in constant contact with the inner wall of the pump casing. The rotary vane rotates with the rotor, and the vacuum pump chamber can be divided into several variable volumes. Pay attention to the following when operating the rotary vane vacuum pump:
- Before using the rotary vane vacuum pump, ensure that the pump is clean and prevent debris from entering the pump. Check the oil level to prime the oil to the center of the oil mark when the pump is stopped. Too low to the exhaust valve can not function as a sealing oil, affecting the degree of vacuum. Too high will cause fuel injection when the atmosphere is activated. When operating, the oil level is raised, which is normal. The oil is supplied from a grease hole using a clean vacuum pump oil of the specified grade. After refueling, the screw plug should be screwed on. The oil should be filtered to prevent the inclusion of debris, block the oil hole, and add the oil to the vacuum pump oil according to the scale indicated on the oil mark. Rotate the three-way valve so that the suction pipe of the pump is connected to the atmosphere, and is insulated from the evacuated container to open the exhaust port.
- When the ambient temperature is too high, the temperature of the oil rises, the viscosity decreases, and the saturated vapor pressure will increase, which will cause the ultimate vacuum to decrease, especially the total pressure measured by the thermocouple meter.
- Vacuum pumps should not be used to remove gases that are too high in oxygen, explosive, and corrosive to metals. In addition, it is not advisable to inhale a gas that can react with pump oil and a gas containing a large amount of water vapor.
- The pump can be started once in the atmosphere or under any vacuum. If the pump port is connected to the solenoid valve, it should be operated simultaneously with the pump.
- After the pump is running normally, slowly rotate the three-way valve so that the suction pipe of the pump is in communication with the evacuated container and is isolated from the atmosphere.
- Turn the pulley by hand to check the operation. After no abnormal situation, turn on the power and pay attention to the direction of rotation.
- After using for a period of time, the belt becomes slack and the motor position is adjusted. Pay attention to the pump oil and find that when the pump oil is mixed with debris or water, replace the new oil, clean the pump body, and do not use the volatile liquid such as acetic acid acetate or acetone to clean the pump body.
- Check the ultimate vacuum of the large vacuum pump. The compressed mercury vacuum gauge shall prevail. If the pre-extraction effect is fully calculated, the pump temperature will be stable, the pump port and the meter will be directly connected, and the ultimate vacuum will be reached within 30 minutes of operation.
- If the relative humidity is high, or the pumped gas contains more condensable steam, after opening the pumped container, the gas ballast valve should be opened, and the gas ballast valve should be closed after 20~40 minutes of movement. Before stopping the pump, the open air valve can be unloaded for 30 minutes to extend the life of the pump oil.
- When stopping the pump, if you want to keep the vacuum system with a certain degree of vacuum, you should rotate the three-way valve to close the vacuum system, and the suction pipe of the pump is connected to the atmosphere. Turn off the power and stop running. Close the vent and cover the pump cover.