What is a Gear Pump ? | How does it work ? | External Gear | Internal Gear

Gear pumps are a fundamental component in various mechanical systems, yet many people are unfamiliar with how they work. In this video, we explore the intricacies of gear pumps, shedding light on their operation and advantages.
A gear pump belongs to the positive displacement (PD) pump category, characterized by its ability to displace a fixed volume of fluid with each cycle. This displacement is achieved through interlocking gears or cogs, which enclose a fixed volume of fluid and transfer it mechanically using a cyclic pumping action. The rotational speed of the gears determines the smooth, pulse-free flow of the pump.
This video delves into the key features of gear pumps:
1. Positive Displacement: Gear pumps displace a fixed volume of fluid per cycle, thanks to their interlocking gears.
2. Interlocking Gears: These pumps consist of two gears with interlocking teeth, creating chambers that trap fluid.
3. Fixed Volume Enclosure: The gears repeatedly enclose a fixed volume of fluid, determined by their size and the pump casing.
4. Mechanical Transfer: Fluid is mechanically transferred from the inlet to the outlet as the gears rotate, driven by a motor.
5. Smooth, Pulse-Free Flow: Gear pumps deliver a consistent flow without pulsations due to their continuous displacement.
6. Proportional Flow: The flow rate is directly proportional to the rotational speed of the gears.
We also explore the two basic designs of gear pumps: external and internal. External gear pumps have two identical gears supported by separate shafts, while internal gear pumps feature gears of different sizes, with one rotating inside the other.
The video concludes by highlighting the main benefit of gear pumps: their compact and simple design with a limited number of moving parts. Although they cannot match the pressure of reciprocating pumps or the flow rates of centrifugal pumps, gear pumps offer higher pressures and throughputs than vane or lobe pumps. They are particularly well-suited for pumping oils and other high viscosity fluids.
Join us as we unravel the inner workings of gear pumps and discover why they are essential in various industrial and mechanical applications.