The vacuum level of a rotary pump, specifically a rotary vane pump, can achieve ultimate vacuums down to 2 x 10-3 mbar. This type of pump is commonly used as a pre-vacuum pump and is effective for direct evacuation of atmospheric pressure.
4 Key Insights into the Vacuum Level of Rotary Vane Pumps
1. Types of Vacuum and Rotary Vane Pumps
Vacuum levels are categorized into rough or low vacuum, high vacuum, and ultrahigh vacuum, based on the scarcity of gas molecules. Rotary vane pumps are typically used to achieve rough or low vacuum levels. These pumps operate by reducing the pressure within a sealed volume, which decreases the number of gas molecules present.
2. Operation of Rotary Vane Pumps
Rotary vane pumps are designed with a rotating mechanism that includes vanes or blades which move radially within a chamber. As the rotor turns, the vanes create pockets that draw in gas from the inlet and expel it through the outlet, reducing the pressure within the system. These pumps can be single or double stage; double stage pumps are capable of achieving lower pressures, suitable for a rough vacuum.
3. Vacuum Levels Achieved
The specific vacuum level achieved by a rotary vane pump is influenced by its design and stage configuration. Single stage pumps typically achieve higher pressures (lower vacuum levels) compared to double stage pumps. The reference provided indicates that rotary vane pumps can reach ultimate vacuums down to 2 x 10-3 mbar, which places them in the category of pumps suitable for achieving low to medium vacuum ranges.
4. Application Considerations
When selecting a rotary vane pump, it is crucial to consider the desired vacuum level based on the application. For processes requiring higher vacuum levels, other types of pumps such as turbomolecular or oil diffusion pumps might be more appropriate as they can achieve higher vacuum levels (lower pressures).
In summary, rotary vane pumps are versatile and commonly used in industrial applications for achieving vacuum levels that are sufficient for many processes, with the capability to reach pressures as low as 2 x 10-3 mbar.
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