1. According to whether the flow rate is adjustable, it can be divided into: variable pump and quantitative pump. The output flow can be adjusted according to the 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 the hydraulic system, it is divided into: gear pump, vane pump and plunger pump 3 types.
Gear pump: small size, simple structure, less strict requirements for oil cleanliness, cheaper price; However, the pump shaft is subjected to unbalanced force, serious wear and 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 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 systems; However, the structure is complex, the material and processing accuracy requirements are high, the price is expensive, and the cleanliness of the oil is high.
