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Vacuum Pumps
The Working Principle of a Diaphragm Pump
When pulling up the membrane, an underpressure is produced. The air in the recipient flows into the pump. Upon the downward movement of the membrane, valve A is closed and the air inside the pump is pushed outside through valve B. With the help of this pump, one can achieve a rough vacuum of about 1 mbar.
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The Working Principle of a Rotary Vane Pump
The eccentric supported rotor and the movable vane increase or decrease the volume between the rotor itself and the casing wall (stator). When increasing the volume a low pressure is produced and the gas to be evacuated is sucked into the pump. When the rotor turns further, the volume decreases and the gas is pushed outside through the exhaust valve under a small overpressure.
With the help of this pump, one can achieve a fine vacuum of about 0,001 mbar.
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