Diffusion pumps are essential components in many industrial applications, especially those requiring high vacuum levels.
What are the 9 Important Characteristics of a Diffusion Pump?
1. No Moving Parts
Diffusion pumps do not have any moving parts.
This makes them durable and reliable.
There is less chance of mechanical failure.
2. Wide Pressure Range
Diffusion pumps can function over a wide pressure range, from 10-10 to 10-2 mbar.
This makes them suitable for various applications.
These include electron-beam microscopy, vacuum deposition, coatings, and vacuum furnaces.
3. Convection-Driven
Diffusion pumps are driven by convection, not mechanical means.
This results in low energy efficiency.
However, it allows for a simple operational principle.
4. Vacuum Pumpdown
Diffusion pumps have automatic vacuum pumpdown capabilities.
They are interlocked with a holding pump.
This helps maintain a low pressure on the diffusion pump foreline.
It also prevents backstreaming of pump oils into the chamber.
5. Vapor Trapping
Diffusion pumps use the vapor of a boiling fluid (usually oil) to capture air molecules.
The vapor is compressed in a vertically tapered stack with jet openings.
This creates an umbrella of vapor that captures air.
The air molecules are then moved to another location and cooled, causing them to be released.
6. Combination of Gravity and Vapor Flow
The combination of gravity and the downward direction of the vapors in a diffusion pump helps move the air molecules towards the bottom of the pump.
7. Compatibility and Resistance
A good diffusion pump should have high corrosion resistance.
It should also have high condensate compatibility and universal chemical resistance.
This ensures that it can handle various substances without degradation or damage.
8. Durability and Low Maintenance
Diffusion pumps are known for their durability and reliability due to the absence of moving parts.
They require minimal maintenance, making them cost-effective in the long run.
9. Pumping System Integration
Diffusion pumps are often integrated into a larger pumping system.
They are typically activated between 10 and 1 microns.
They work alongside mechanical pumps and booster pumps to achieve high vacuum levels.
Continue exploring, consult our experts
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