Rotary vane vacuum pump advantages and disadvantages
Rotary vane vacuum pumps are generally used in conjunction with laboratory instruments such as rotary evaporators and glass reactors. Its main function is to vacuum.
Rotary vane vacuum pump is a kind of basic vacuum obtaining equipment, which can be used to obtain vacuum or as the backing pump of other medium and high vacuum pumps. Compared with other vacuum pumps, the rotary vane pump has the advantages of compact structure, small size, light weight, low noise and low vibration. It can be widely used in vacuum smelting, vacuum coating, vacuum heat treatment, vacuum drying and other processes in metallurgy, machinery, electronics, chemical, petroleum, pharmaceutical and other industries.
The advantages of rotary vane vacuum pumps:
1. The advantage of the rotary vane vacuum pump is that the vacuum degree of the newly put into use pump is relatively high.
2. The gas compression in the rotary vane vacuum pump is isothermal. Because there is no exhaust valve and friction surface, it can pump dusty gas, condensable gas and gas-water mixture. With these outstanding features, despite its low efficiency, it is still widely used.
3. Simple structure, low manufacturing precision, simple processing, compact structure.
4. It is equipped with an anti-oil return device when the pump is stopped, which is convenient to restart.
5. Equipped with gas ballast valve to remove a small amount of water vapor.
6. The exhaust port is equipped with an oil mist trap to avoid environmental pollution.
7. High pumping speed can still be maintained under low pressure.
8. Low noise and low vibration.
9. Since the gas compression in the rotary vane vacuum pump is isothermal, it can extract flammable and explosive gases. Since there is no exhaust valve and friction meter, it can extract dusty gas, condensable gas and gas-water mixture. With these outstanding features, despite its low efficiency, it is still widely used.
Disadvantages of rotary vane vacuum pumps:
1. Low efficiency: generally around 30%, better up to 50%,
2. Low vacuum: This is not only due to structural restrictions, but more importantly, restricted by the saturated vapor pressure of the working fluid.
3. Using water as working fluid: the ultimate pressure can only reach 2000—4000Pa. Use oil as working fluid, up to 130Pa.
In summary, combining its advantages and its disadvantages. We can know that the gas compression in the vacuum pump is isothermal, so flammable and explosive gas can be removed, and its safety can still be guaranteed. Because there is no exhaust valve and conflict surface, it can pump dusty gas and gas-water mixture. Precisely because of these characteristics, despite its low efficiency, it is still very competitive in the entire market.
