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2. Gear pump - Wikipedia

   en.wikipedia.org/wiki/Gear_pump

   Gear pumps are also widely used in chemical installations to pump high-viscosity fluids. 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 (internal spur gear teeth face inwards, see below). Gear pumps provide positive displacement (or ...

3. Rotodynamic pump - Wikipedia

   en.wikipedia.org/wiki/Rotodynamic_pump

   A positive-displacement pump operates by forcing a fixed volume of fluid from inlet pressure section of the pump into the discharge zone of the pump. It can be classified into two types: Rotary-type positive-displacement pumps: Internal gear pumps; Screw pumps; Reciprocating-type positive-displacement pumps: Piston pumps; Diaphragm pumps

4. Pump - Wikipedia

   en.wikipedia.org/wiki/Pump

   Rotary-type positive displacement: internal and external gear pump, screw pump, lobe pump, shuttle block, flexible vane and sliding vane, circumferential piston, flexible impeller, helical twisted roots (e.g. the Wendelkolben pump) and liquid-ring pumps

5. Gerotor - Wikipedia

   en.wikipedia.org/wiki/Gerotor

   A gerotor / dʒ ə ˈ r oʊ t ə r / is a positive displacement pump. The name gerotor is derived from "generated rotor." A gerotor unit consists of an inner and an outer rotor. The inner rotor has n teeth, while the outer rotor has n + 1 teeth, with n defined as a natural number greater than or equal to 2. The axis of the inner rotor is offset ...

6. Rotary vane pump - Wikipedia

   en.wikipedia.org/wiki/Rotary_vane_pump

   An eccentric rotary vane pump Another eccentric rotary-vane pump design. Note that modern pumps have an area contact between rotor and stator (and not a line contact). 1. pump housing 2. rotor 3. vanes 4. spring. A rotary vane pump is a type of positive-displacement pump that consists of vanes mounted to a rotor that rotates inside a cavity. In ...

7. Lobe pump - Wikipedia

   en.wikipedia.org/wiki/Lobe_pump

   A lobe pump, or rotary lobe pump, is a type of positive displacement pump. It is similar to a gear pump except the lobes are designed to almost meet, rather than touch and turn each other. An early example of a lobe pump is the Roots Blower , patented in 1860 [ 1 ] to blow combustion air to melt iron in blast furnaces, but now more commonly ...