Laboratory vacuum pump features and operation instructions

- Jan 29, 2019-

Laboratory vacuum pump features:

1. Anti-return oil design The intake passage is specially designed to prevent the pump oil from flowing back after the pump is stopped and contaminating the pumped container and pipeline.
2. The fuel tank is treated as a compartment, and an oil and gas separation device is arranged on the exhaust port, which does not spray oil and reduces oil mist pollution.
3. It has high heat dissipation efficiency, can guarantee continuous operation for a long time, and has good appearance quality.
4. The motor and pump adopt an integrated design, which is more compact, light and reasonable.
5, low temperature and low voltage environment for special design, to ensure normal start-up in the winter environment temperature (≥ ≥ 5 ° C) low voltage (≥ 180V).
6. Use anti-vibration rubber feet to reduce vibration noise.
Laboratory vacuum pump use:
The laboratory vacuum pump is a rotary vane oil seal single stage vacuum pump. A basic device used to remove gas from a sealed container to obtain a vacuum. The vacuum pump can be used for various vacuum operations such as air conditioning, refrigeration equipment repair, suction device for medical instruments, vacuum packaging, vacuum absorbing, physical and chemical experiments, and small devices requiring a vacuum environment. It can also be used as a foreline pump for small oil booster pumps, oil diffusion pumps, molecular pumps, etc. The rotary vane vacuum pump is not suitable for removing gases that are corrosive to ferrous metals, chemically reacting to pump oil, containing particulate dust, and toxic gases that are too high in oxygen and explosive. It cannot be used as a transfer pump (ie, pumping from one container to another).
Laboratory vacuum pump operation instructions:
1. 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 act as an oil seal, affecting the degree of vacuum. Too high may cause fuel injection when the atmosphere is started. When operating, the oil level is raised, which is normal. The oil is supplied with a specified grade of clean vacuum pump oil from the oil filler hole. After refueling, the screw plug should be screwed on. The oil should be filtered to prevent debris from entering the laboratory vacuum pump to block the oil hole.
2. The laboratory vacuum pump can be started once in the atmosphere or under any vacuum. If the pump port is connected to a vacuum valve, it should be operated simultaneously with the 2XZ vacuum pump.
3. When the ambient temperature is too high, the temperature of the oil rises, the viscosity decreases, and the saturated vapor pressure increases, which causes the ultimate vacuum of the 2XZ rotary vane vacuum pump to decrease, especially the total pressure measured by the thermocouple meter. The ultimate vacuum can be improved by enhancing ventilation or improving pump performance.
4. Check the ultimate vacuum of the laboratory vacuum pump according to the compressed mercury vacuum gauge. If the pre-extraction check is completed, 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. The value measured by the total pressure gauge is related to the pump oil and vacuum gauge, and the regulation error. Sometimes the error can be very large and can only be used as a reference.
5. 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 to 40 minutes of operation. Before stopping the pump, the open air valve can be unloaded for 30 minutes to extend the oil life of the 2XZ rotary vane vacuum pump.
6. Oil selection for laboratory vacuum pumps: The viscosity of the pump oil affects the starting power and the ultimate vacuum of the pump. When the viscosity is high, the vacuum is favorable and the starting power is larger. The saturated vapor pressure of the oil at the pump temperature will affect the ultimate pressure of the pump. The lower the better. The viscosity of high-speed vacuum pump oil and 3# diffusion pump oil is larger than that of No. 1 vacuum pump oil, and the saturated vapor pressure is lower than that of No. 1 vacuum pump oil, but the price of 3# diffusion pump oil is higher. The specific oil selected can be selected according to the above description combined with the specific use requirements.
(1) Under normal circumstances, a small pump of 4 liters/second or less can also be replaced by a No. 1 vacuum oil pump, and a direct pump of 8 liters/second or more can be replaced by a 3# diffusion pump oil.
(2) If the vacuum degree is not high, and the oil pollution is frequently replaced, the vacuum laboratory vacuum pump oil supply is difficult, and the 50th mechanical oil can be used instead.
(3) If the ambient temperature is low, the starting is difficult, and the ultimate vacuum requirement is not high. Vacuum pump oil or mechanical oil with a slightly lower viscosity may be used.