Working principle of gear pump

Gear pump is a common hydraulic pump, and its working principle is mainly based on the rotation and meshing of gears to transfer liquid. The following is a detailed explanation of the working principle of the gear pump:
​Structural composition
The gear pump is mainly composed of two gears (one is the driving gear, the other is the driven gear), the pump body and the front and back cover. The two gears are nested within each other and rotate inside the pump. The pump body provides an enclosed space for the gear, ensuring that the liquid circulates inside the pump without spilling.
​Working process
Oil absorption process:
When the driving gear begins to rotate, the teeth gradually disengage, forming an intertooth volume.
As the gear continues to rotate, the volume between the teeth gradually increases, creating a low-pressure area inside the gear pump.
Due to the presence of a low pressure area, a liquid (such as oil) is drawn from the oil inlet into this intertooth volume.
Oil discharge process:
As the drive gear continues to rotate, the gear teeth enter the meshing state again.
The volume between the teeth gradually decreases, causing the fluid in them to be compressed.
The compressed liquid is then discharged from the pump body through the oil outlet and into the rest of the hydraulic system.
Working characteristics
High efficiency: gear pump due to its simple structure and low manufacturing costs, making it relatively high efficiency.
Flow stability: Because the rotation of the gear is uniform, the flow output is relatively stable.
Low noise: The structural design of the gear pump makes the noise generated in the work relatively small.
Long service life: Because of its simple structure and easy maintenance, the service life of the gear pump is relatively long.
type
Gear pumps are generally divided into two types: internal gear pumps and external gear pumps.
​Internal gear pump: In this type of gear pump, two or more gears rotate inside a sealed pump housing. One gear acts as a driving gear, rotating through a mechanical or electrical power source, thereby driving the other gears to rotate. The liquid enters the pump housing through the inlet and is pushed to the outlet by the rotation of the gear.
External gear pump: In this type of gear pump, two gears are located on the outside of the pump. One gear (the drive wheel) is connected to a mechanical or electrical power source, while the other gear rotates accordingly. The liquid enters the pump body through the inlet and is pushed to the outlet by the rotation of the gear.
In summary, the gear pump realizes the suction and discharge of the liquid through the rotation and meshing of the gear, which has the advantages of high efficiency, stable flow rate, low noise and long service life.