Classification of hydraulic pumps
1, according to whether the flow can be adjusted can be divided into: variable pump and quantitative pump. The output flow can be adjusted as needed, called the variable pump, and the flow cannot be adjusted, called the fixed pump.
2. According to the pump structure commonly used in hydraulic systems, it is divided into three types: gear pump, vane pump and plunger pump.
Gear pump: The volume is small, the structure is simple, the cleanliness of the oil is not strict, and the price is cheaper; but the pump shaft is unbalanced, the wear is serious, and the leakage is large.
Vane pump: divided into double-acting vane pump and single-acting vane pump. The pump has uniform flow, stable operation, low noise, high pressure and volumetric efficiency compared to the gear pump, and the structure is more complicated than the gear pump.
Piston pump: high volumetric efficiency, small leakage, can work under high pressure, mostly used in high-power hydraulic systems; but the structure is complex, material and processing precision requirements are high, the price is expensive, and the cleanliness of oil is high.