What is an External Gear Pump?
A gear pump is a type of positive displacement (PD) pump. Gear pumps use the actions of rotating cogs or gears to transfer fluids. The rotating gears develop a liquid seal with the pump casing and create a vacuum at the pump inlet. Fluid, drawn into the pump, is enclosed within the cavities of the rotating gears and transferred to the discharge. A gear pump delivers a smooth pulse-free flow proportional to the rotational speed of its gears.
How does an External Gear Pump Work?
There are three stages in an External gear pump’s working cycle filling, transfer and delivery As the gears come out of mesh on the inlet side of the pump, they create an expanded volume. Liquid flows into the cavities and is trapped by the gear teeth as the gears continue to rotate against the pump casing. The trapped fluid is moved from the inlet, to the discharge, around the casing. As the teeth of the gears become interlocked on the discharge side of the pump, the volume is reduced and the fluid is forced out under pressure.
Different Types of Gear
External gear pump designs can utilise spur, helical or herringbone gears . A helical gear design can reduce pump noise and vibration because the teeth engage and disengage gradually throughout the rotation. However, it is important to balance axial forces resulting from the helical gear teeth and this can be achieved by mounting two sets of ‘mirrored’ helical gears together or by using a v-shaped, herringbone pattern. With this design, the axial forces produced by each half of the gear cancel out. Spur gears have the advantage that they can be run at very high speed and are easier to manufacture.
Some typical applications of external gear pumps are
- Various fuel oils and lube oils (engine and gear box lubrication systems)
- Chemical additive and polymer metering
*Chemical mixing and blending - Tanker Unloading ( For molasess & Other high Viscous Liquid )
- Acids and caustic (with stainless steel or composite construction)
- Resins and polymers
- Alcohols and solvents
- Fule Oils, Lube Oils , Vegitable Oils, Diesel , LDO ,ETC
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