(2) There are water pumps, sand pumps, mud pumps, sewage pumps, sewage pumps, well pumps, submersible pumps, spray pumps, household pumps and fire pumps.
(3) According to power types, there are manual pumps, animal-drawn pumps, pedal pumps, air pumps, solar pumps, electric pumps, electric pumps, water wheel pumps, internal combustion pumps, water hammer pumps, etc.
(4) According to the working principle, there are centrifugal pumps, mixed-flow pumps, axial-flow pumps, vortex pump pumps, jet pumps, positive displacement pumps (screw pumps, piston pumps and diaphragm pumps), chain pumps, electromagnetic pumps, liquid ring pumps and pulse pumps.
# # Be sure to read the instructions before use, and be sure not to make a mistake. If you don't use it for a long time, you must turn the impeller before using it, otherwise it will burn because you don't get stuck for a long time. Before starting the pump, the suction pipe and the pump must be filled with liquid. After starting the pump, the impeller rotates at high speed, and the liquid inside rotates with the blades. Under the action of centrifugal force, it flies off the impeller and ejects outward. The speed of the sprayed liquid in the diffusion chamber of the pump shell gradually slows down, the pressure gradually increases, and then it is pumped out.