PUMPS - Centrifugal,Gear,Screw & Vaccum

VACUUM PUMP A  vacuum pump  is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum . The first vacuum pump was invented in 1650 by  Otto von Guericke , and was preceded by the  suction pump , which dates to antiquity. Contents    [ hide ]  1   Types 2   Performance measures 3   Positive displacement 4   Momentum transfer 5   Regenerative Pump 6   Entrapment 7   Other pump types 8   Techniques 9   Uses of vacuum pumps 10   History of the vacuum pump 11   Hazards 12   See also 13   References Types [ edit ] Pumps can be broadly categorized according to three techniques: [1] 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...

GEAR PUMP A  gear pump  uses the meshing of gears to pump fluid by displacement. [1]  They are one of the most common types of  pumps  for hydraulic fluid power applications. Gear pumps are also widely used in chemical installations to pump fluid with a certain viscosity. There are two main variations;  external gear pumps  which use two external spur gears, and internal gear pumps  which use an external and an internal spur gear. Gear pumps are  positive displacement  (or  fixed displacement ), meaning they pump a constant amount of fluid for each revolution. Some gear pumps are designed to function as either a  motor  or a pump. Contents    [hide]  1   Theory of operation 3   References 4   External links Theory of operation [ edit ] As the gears rotate they separate on the intake side of the pump, creating a void and suction which is filled by  fluid...