The circular arc gear pump is a kind of volume pump, which consists of two gears, pump body and front and rear cover. When the gear rotates, the volume of the space on the gear detachment side increases from small to large, forming a vacuum, which sucks the liquid into the gear meshing side. The volume of the space on the gear meshing side decreases from large to small, and the liquid is squeezed into the pipeline. The suction chamber and the discharge chamber are separated by the meshing lines of two gears.