Working principle of gear pump

  Gear pump is a type of positive displacement pump, which works based on the volume change generated by the rotation of one or more pairs of meshing gears to transport fluid. The following is a detailed explanation of the basic working principle of gear pumps:

Work Structure:

  A gear pump is mainly composed of two closely matched gears, one of which is the driving wheel driven by an external drive shaft to rotate, and the other is the passive wheel that meshes with the driving wheel and rotates accordingly. These two gears are embedded in a pump body, with inlet and outlet ports on both sides of the pump body, respectively connected to the conveying pipeline.

Working process:

1. Inlet side (inlet end): When the gear rotates, the space formed by the gradual separation of the two gears increases, creating a local vacuum, and the external fluid is sucked into the pump chamber under the action of atmospheric pressure.

2. Sealing and conveying stage: The gear continues to rotate, moving the fluid entering the pump chamber along the internal space of the housing. At this time, the fluid is in the enclosed space between the two gear teeth and moves forward together with the gear.

3. Discharge port side (outlet end): With the rotation of the gear, the fluid is pushed to the outlet side. At this time, the two gears come into contact again, the volume decreases, and the fluid is compressed and discharged through the outlet.

Characteristic analysis:

-Continuous conveying: As long as the gears continue to rotate, the fluid can be continuously sucked in and discharged, providing a stable flow rate.

-Self suction ability: Gear pumps can be started without the need for additional liquid introduction devices and have strong self-priming ability.

-Wide applicability: It can not only treat clean water, but also effectively transport liquids with certain viscosity, and even media containing particulate impurities.

-Good sealing: The precise fit between gears reduces leakage and improves pump efficiency.

matters needing attention:

Although gear pumps have obvious advantages, they may encounter problems such as increased resistance and increased wear when dealing with media with extremely high viscosity or large particles. Therefore, when selecting and using, the characteristics of the medium should be fully considered, and the pump model and material should be selected reasonably to ensure normal operation and longer service life of the pump.

In short, gear pumps rely on simple mechanisms to achieve effective liquid transportation, especially playing an indispensable role in industrial production. By understanding the working principle, we can better grasp the applicable conditions of gear pumps and provide guidance for practical applications.