Dry pumps are a type of vacuum pump that operate without the use of oil or other lubricants, providing a clean vacuum and minimal waste generation. The different types of dry pumps include:
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Diaphragm Pumps: These pumps use a reciprocating diaphragm to create vacuum. They are oil-free, require little maintenance, and are suitable for applications sensitive to contamination. Diaphragm pumps can be customized with different speeds, pressures, and regulation types (e.g., RPM or valve-regulated). They often feature corrosion-resistant coatings like PTFE, making them compatible with a variety of chemical solvents.
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Scroll Pumps: These pumps utilize two interleaved spiral scrolls that move eccentrically to compress air and vapors, directing them towards the exhaust. Scroll pumps can achieve deeper vacuum levels (e.g., 10–3 Torr) and higher pumping speeds compared to diaphragm pumps, making them suitable for applications requiring high flow rates, such as gloveboxes. However, they may require periodic replacement of tip seals and are generally less corrosion-resistant than diaphragm pumps.
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Turbomolecular Pumps: These high-vacuum pumps use rotating blades to create a directional momentum transfer to gas molecules, effectively pumping them out. They are typically used in scientific and semiconductor applications where very high vacuum levels are required.
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Piston Pumps: These pumps use a piston to displace air, creating a vacuum. They are often used in applications where a moderate vacuum is needed and can be designed to be oil-free, making them suitable for clean environments.
Each type of dry pump offers specific advantages and is suited to different applications based on factors such as vacuum level requirements, flow rates, chemical compatibility, and maintenance considerations.
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