Could someone explain the working principle of a gear pump?

The structure and working principle of external gear pumps: Their most basic form consists of two gears of the same size that mesh with each other as they rotate inside a tightly fitting housing. The interior of this housing is shaped like an “8”, with the two gears located within it; the outer diameter of these gears, as well as their sides, fit tightly against the housing. The material coming from the extruder enters between the two gears at the inlet and fills this space; as the gears rotate, it moves along the housing, and is finally discharged when the two gears mesh. In technical terms, a gear pump is also known as a positive-displacement device; it functions like a piston inside a cylinder, and as one tooth enters the fluid space occupied by another tooth, the liquid is mechanically forced out. Since liquids are incompressible, the liquid and the tooth cannot occupy the same space at the same time; as a result, the liquid is displaced. Due to the continuous meshing of the teeth, this phenomenon occurs continuously, thereby providing a steady discharge volume at the pump’s outlet; the amount discharged is the same with each rotation of the pump. As the drive shaft rotates continuously, the pump also continuously discharges fluid. The flow rate of the pump is directly related to its rotational speed. A pair of intermeshing gears and a pump cylinder separate the suction chamber from the discharge chamber. As the gear rotates, the volume between the teeth where they are separated on the suction chamber side gradually increases, resulting in a decrease in pressure; the liquid then enters the space between the teeth due to this pressure difference. As the gear rotates, the liquid between the teeth is carried to the discharge chamber. At this point, the inter-tooth volume at the gear mesh on the discharge chamber side gradually decreases, thereby discharging the liquid.

Thanks to the friend upstairs for the advice! I’ve been learning about *gear pumps lately