Commonly used pump structures in hydraulic systems

The pump structures commonly used in hydraulic systems are classified according to: gear pumps, vane pumps and piston pumps 3 types.

Hydraulic oil pump gear pump

Smaller volume, simpler structure, less stringent requirements for oil cleanliness, cheaper; however, the pump shaft is subject to unbalanced forces, serious wear, and larger leakage.

Hydraulic oil pump vane pump

Divided into double-acting vane pump and single-acting vane pump. This kind of pump flow uniform, smooth running, low noise, for pressure and volume efficiency than the gear pump, the structure is more complex than the gear pump. Features: 1, reasonable design, processing precision circular arc vane, reduce the vane to the stator inside the curve of the compressive stress, improve the service life of the stator and vane; 2, the stator using advanced high-square no impact transition curve, so that the vane has a good movement and stress state, to ensure a good contact between the vane and the stator, and make the flow loss, pressure and flow pulsation for the smallest, lower noise, longer life. 3、Adopt cartridge structure, the main viscera parts into the form of components, pump core replacement can be completed in a few minutes

Hydraulic oil pump plunger pump

High volumetric efficiency, small leakage, can work under high pressure, mostly used in high-power hydraulic system; but the structure is complex, high material and processing accuracy requirements, expensive, high requirements for oil cleanliness. 　Generally in the gear pump and vane pump can not meet the requirements before using the piston pump. There are some other forms of hydraulic pumps, such as screw pumps, but the application is not as common as the above three.