What are the types of pumps
Hydraulic pumps are divided into gear pumps, vane pumps and plunger pumps.
Gear pump: small volume, simple structure, lax requirements for oil cleanliness and cheaper price; However, the pump shaft suffers from unbalanced force, serious wear and leakage.
Vane pump: it is divided into double acting vane pump and single acting vane pump. The pump has the advantages of uniform flow, stable operation, low noise, higher operating pressure and volumetric efficiency than gear pump, and more complex structure than gear pump.
Plunger pump: high volumetric efficiency, small leakage, can work under high pressure, mostly used in high-power hydraulic system; However, it has complex structure, high requirements for materials and processing accuracy, expensive price and high requirements for oil cleanliness.
Generally, the plunger pump is used when the gear pump and vane pump can not meet the requirements. There are some other forms of hydraulic pumps, such as screw pumps, but the application is not as common as the above three.