Hydraulic pump definition: rely on the change of sealed working volume to achieve suction, pressure liquid, so as to convert mechanical energy into hydraulic energy machine.
Types of commonly used 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 according to the need 'is called variable pump, the flow can not be adjusted is called fixed pump.
2. According to the pump structure commonly used in the hydraulic system, it is divided into gear pump, vane pump and plunger pump.
Gear pump: small volume, simple structure, the cleanliness of oil requirements are not strict, the price is cheaper; But the pump shaft by unbalanced force, serious wear, large leakage.
Vane pump: divided into double - acting vane pump and single - acting vane pump. This pump flow uniform, smooth operation, low noise, pressure and volume efficiency than gear pump, structure than gear pump complex.
Plunger pump: high volume efficiency, small leakage, can work under high pressure, mostly used for high-power hydraulic system; But the structure is complex, the material and the processing precision requirements are high, the price is expensive, and the oil cleanliness requirements are high.