Definition - What does Gear Pump mean?
A Gear Pump is a type of pump that uses a network of gears to draw fluids by displacing them. This is a common kind of pump that is mostly used in the applications of hydraulic-fluid power. The pump is used in chemical installation that is used to draw or push the fluids having high viscosity. This pump has two variations - the internal and external gear pumps. The internal gear pump uses internal and external spur gears while the external gear pump uses two external spur gears. These two pumps have positive displacements as for each revolution they pump a steady volume of fluid.
Petropedia explains Gear Pump
When the gears of a Gear Pump rotate, they separate the intake side of the pump that creates a void and suction which is brimmed by fluid. The gears carry the fluid to the discharge side of the pump where the fluid is displaced by the meshing of gases. The high clearances with the rotation speed prevent the fluid from leaking in backward direction. The rigid designs of houses and gears allow the ability to pump the fluids with high viscosity.
These pumps are used in hydraulic systems. With few moving parts, they work smoothly and amazingly at pressure up to 250 bar. Gear Pumps have two variations:
External Gear Pumps: These pumps are used in the mobile and industrial hydraulic applications. They are typically used as lubrication pumps in the machine tools, oil pumps and fluid power transfer-units in engines. In these pumps one gear-wheel is connected to the drive and other rotates in the opposite direction to interlock the teeth of the rotating gear wheels.
Internal Gear Pumps: These are used in non-mobile hydraulic systems and vehicles used in an enclosed space. They are versatile pumps that are capable of handling thick fluids. In these pumps a gear rotor is connected to the drive. When an internal gear and the gear rotor rotate, a volume is created between the housing walls, gear ring profiles and filling piece.