Types Of Common Hydraulic Pumps
1. It can be divided into variable pump and quantitative pump according to whether the flow rate can be adjusted. The output flow can be adjusted according to the need is called variable pump, the flow can not be adjusted is called quantitative pump.
2. According to the commonly used pump structure in the hydraulic system, it can be divided into gear pump, blade pump and plunger pump.
Gear pump: smaller volume, simpler structure, less requirements on oil cleanliness, lower 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. The pump has uniform flow, smooth operation, low noise, higher operating pressure and volumetric efficiency than gear pump, and more complex structure than gear pump.
Plunger pump: high volume efficiency, small leakage, working under high pressure, mostly used in high-power hydraulic system; But the structure is complex, the material and the processing precision request is high, the price is expensive, to the oil clean degree request is high.
Plunger pump is usually used when gear pump and vane pump cannot meet the requirements. There are some other forms of hydraulic pumps, such as screw pumps, but the application is not as common as the above three types.