Do you know the classification of hydraulic pumps

1. According to whether the flow rate is adjustable or not, it can be divided into: variable pump and fixed pump. The output flow rate can be adjusted according to the need to become a variable pump, and the flow rate cannot be adjusted to become a fixed pump.

2. According to the pump structure commonly used in hydraulic system, it can be divided into: Hydraulic gear pump, Hydraulic vane pump and Hydraulic Piston pump.

Gear pump: small volume, simple structure, lax requirements for oil cleanliness and low 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. This kind of pump has the advantages of uniform flow, smooth operation, low noise, higher working pressure and volumetric efficiency and more complicated structure than gear pump.

Piston pump: it has high volume efficiency, small leakage, can work under high pressure, and is mostly used in high-power hydraulic systems; However, the structure is complex, the material and processing accuracy are high, the price is expensive, and the cleanliness of oil is high.

Generally, the piston pump is only used when the gear pump and vane pump can't meet the requirements. There are some other types of hydraulic pumps, such as screw pumps, but their applications are not as common as the above three.