Types of commonly used hydraulic pumps

1. According to whether the flow can be adjusted, it can be divided into: variable pump and fixed pump. The output flow can be adjusted according to needs is called a variable pump, and the flow cannot be adjusted is called a quantitative pump.

2. According to the commonly used pump structure in hydraulic system, it is divided into three types: gear pump, vane pump and plunger pump.

Gear pump: small in size, simple in structure, less demanding on oil cleanliness, and relatively cheap; but the pump shaft is subject to unbalanced forces, severe wear, and large leakage.

Vane pump: divided into double-acting vane pump and single-acting vane pump. This kind of pump has uniform flow, stable operation, low noise, higher working pressure and volumetric efficiency than gear pumps, and more complicated structure than gear pumps.

Plunger pump: high volumetric efficiency, low leakage, can work under high pressure, mostly used in high-power hydraulic systems; but the structure is complex, the material and processing accuracy requirements are high, the cost is expensive, and the oil cleanliness requirements are high.