Vacuum Pumps

vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. Pumps can be broadly categorized according to three techniques:

Positive displacement pumps use a mechanism to repeatedly expand a cavity, allow gases to flow in from the chamber, seal off the cavity, and exhaust it to the atmosphere. Momentum transfer pumps, also called molecular pumps, use high speed jets of dense fluid or high speed rotating blades to knock gas molecules out of the chamber. Entrapment pumps capture gases in a solid or adsorbed state. This includes cryopumpsgetters, andion pumps.

Vacuum pumps are used in many industrial and scientific processes including composite plastic moulding processes, driving some of the flight instruments in older and simpler aircraft without electrical systems, production of most types of electric lampsvacuum tubes, and CRTs where the device is either left evacuated or re-filled with a specific gas or gas mixture, semiconductor processing, electron microscopy, medical processes that require suction, uranium enrichment, medical applications such as radiotherapyradiosurgery and radiopharmacy, analytical instrumentation to analyse gas, liquid, solid, surface and bio materials,mass spectrometers to create a high vacuum between the ion source and the detector, vacuum coating on glass, for durability and for energy saving, such as low-emissivity glass, hard coating for engine components, ophthalmic coating, milking machines, vacuum impregnation of porous products such as wood or electric motor windings, air conditioning service, trash compactor,vacuum engineeringsewage systemsfreeze drying, and fusion research.

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