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High Vacuum / UHV Pump Technology
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Your choices are...
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Turbomolecular
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Turbomolecular pumps use a series of high-speed rotors (25,000 to 75,000 rpm) and flow stabilizing, stationary stators to impart a preferential motion to gas molecules and create molecular flow through the pump. They are often described as "molecular bats." They are also known as axial flow turbines.
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Molecular Drag
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Molecular drag pump are similar to turbomolecular pumps except a rotor drum with a ridged surface and cylindrical stator are used in place of stator and rotor blades to impart a preferential motion to gas molecules and create molecular flow through the pump. Hybrid pumps are available that use combinations of blades and ridged drums.
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Diffusion / Vapor
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Diffusion pumps use jets of diffusion oil vapor to impart momentum and sweep gas molecules from the system. Diffusion pumps have no moving parts and provide the highest pumping speed for lighter gases like helium and hydrogen. Diffusion pump oil can wander or backstream into the system causing process contamination.
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Ion
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Ion pumps utilize a sputtering process to ionize then entrain gas molecules and embed them into the anode or cathode wall. The entrainment process can utilize a getter such as titanium to bind and bury the molecules. They can operate in the ultra high vacuum range and eliminate contamination by organic molecules.
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Cryogenic / Cryosorption
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Cryogenic pumps utilize extremely cold (liquid N2 and He temperatures) surfaces and absorption surfaces freeze or trap molecules. Cryogenic pumps can operate with relatively high fore or exhaust pressures. Cryogenic pumps must be periodically generated to purge the frozen or trapped gases.
Cryosorption pumps evacuate gas molecules from a volume by adsorbing them on the chilled surface of a molecular sieve. These molecular sieves are designed to have a large surface area-to-volume ratio to maximize the adsorbing area.
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Getter / TSP / NEG Sorption
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Getter or titanium sublimation pumps (TSP) entrain gas molecules in a getter, or material that is vaporized in order to absorb or capture the molecules, and embed them on the cold outer wall of the chamber. These can also use "non-evaporating Gettering sorption" techniques by using a large-surface-area porous matrix for entrainment.
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Other
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Unlisted, specialized, or proprietary high vacuum pump.
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Mechanical Pump Technology
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Your choices are...
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Axial Blower
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Multiple-blade rotor imparts axial velocity which is converted to pressure; very high flow rates.
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Centrifugal Blower
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High-speed impeller produces radial air flow; velocity converted to pressure energy. Evacuated air flows radially outward against blower wall as opposed to axially through tube in axial blowers.
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Circumferential Piston
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Multiple-rotor configuration in which two rotors, each with two "wings" that trap air against the outside wall during rotation and compress it in their rotary stroke toward the outlet. The wings of the two rotors alternate in compression strokes.
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Claw
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Claw or rotary claw pumps use precision-designed intermeshing hooked claws with very tight tolerances and clearances for highly efficient internal compression. They are typically noncontact, minimizing or eliminating friction and wear.
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Diaphragm
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Diaphragm oscillation driven by a reciprocating or eccentric "rocking" rod; no sliding seals or parts. This design isolates the pumped fluid from any contact with the pumping mechanism. Diaphragm pumps exhibit a much lower compression ration than piston pumps, but frequently offer quiet, economical performance.
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Gear Pump
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Gear pumps are positive displacement pumps used to transport high pressure and high volume flows. They use the meshing of gear teeth to reduce volume and move air to evacuate the vacuum chamber.
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Linear
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Stroke of sliding piston compression is generated with electromagnetic oscillation; clean and quiet.
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Liquid Ring
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Eccentrically mounted rotor and vanes utilize liquid ring on inside of chamber to compress air. The liquid also absorbs compression heat and entrained particles in the air.
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Lobed Rotor
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Air is trapped and compressed by the diminishing volume caused by the meshing of oppositely rotating lobes.
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Reciprocating Piston
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Piston mechanically reduces air volume inside cylinder. These pumps may have one or several pistons being driven by a motor. The vacuum levels produced by this pump style are somewhat higher than for other types of mechanical pumps.
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Regenerative Blower
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Similar to centrifugal with airflow chamber designed to generate higher pressure. Air flows radially outward along blade to housing wall, whereupon it flows down to the root of the next blade gap and repeats the cycle. The airflow thus creates several "stages" of compression.
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Rocking Piston
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Similar to reciprocating piston but is not articulated; "rocks" with eccentric motion of drive.
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Rotary Piston
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Rotary piston or cam is rotating eccentrically; evacuates air through check valve on the "compression" or evacuation stroke while air from the vacuum application fills in behind it.
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Rotary Vane
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Eccentrically mounted rotor and sliding vanes compress air in diminishing volume compartments.
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Rotary Screw
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Two or more spindles with intermeshing screws rotate oppositely, creating axially progressing "chambers," moving the air from suction to discharge. Larger pumps often have double suction, where air is let in from both ends to a central discharge port.
Rotary screw pumps often offer good vacuum levels with pulse-free operation.
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Scroll
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Air is moved as intake air is compressed between the surfaces of mating involute spirals, one of which is moving to progressively push the evacuated air out to the exhaust.
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Other
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Unlisted, specialized, or proprietary mechanical vacuum technology.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Integral Backing Pump?
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High vacuum pump system that includes a mechanical, sorption, or other backing pump to provide preliminary vacuum level for the high vacuum stage of the pump.
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
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Lubrication:
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Your choices are...
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Dry / Oil-less
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Permanently sealed bearings or other isolation technology eliminate oil in the fluid train.
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Splash Lubrication
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Oil splashes onto components from bath.
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Oil-flooded
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Sometimes used in rotary vane and other mechanical pump styles; heavy application of oil for the lubrication of moving parts.
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Positive Pressure
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Oil pressure maintained for highest level of lubrication.
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Other
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Other unlisted or specialized lubrication technique.
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Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Stages:
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Stages can be sequential stages of the same technology type (mechanical or Venturi), or two or more different type pumps packaged together, such as a rough, medium, and high vacuum pump system of different technologies.
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Your choices are...
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Single Stage
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Single stage of evacuation; air is moved directly from chamber into atmosphere.
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Two Stage
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Air is evacuated in two stages for lower absolute pressure.
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Three Stage
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Three chambers are used in succession.
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Four or More Stages
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Four or more evacuation stages are employed.
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Search Logic:
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Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Vacuum Pump Drive:
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Your choices are...
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Direct Drive
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Motor is directly coupled to pump shaft.
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Belt Drive
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Motor drives pump shaft through a belt and pulleys.
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Gear Drive
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Motor is coupled to pump via a gear train. May be used to modify speed, increase torque, etc.
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Other
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Other unlisted, specialized or proprietary drive mechanism or configuration.
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Search Logic:
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Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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