Internal structure and type requirements of hydraulic pumps

Hydraulic pumps are the power components in the hydraulic system during use. During operation, the equipment will suck in oil from the hydraulic oil tank, which will directly form pressure oil discharge and effectively deliver it to the actuator. Hydraulic pumps are divided into gear pumps, plunger pumps, vane pumps, and screw pumps according to their structure.

The main working mode of hydraulic pumps is to bring about changes in the volume of the pump chamber during operation, which compresses the fluid and gives it pressure energy. The necessary condition is that the pump chamber has a change in sealing volume.

When using hydraulic pumps, they can be divided into variable displacement pumps and fixed displacement pumps according to their flow rate adjustment. The output flow rate of the equipment can be adjusted according to its needs, which is called variable displacement pumps. If the flow rate cannot be adjusted, it is called fixed displacement pumps. Gear pumps have smaller volumes, simpler structures, less strict requirements for oil cleanliness, and lower prices; But the pump shaft is subjected to unbalanced force, severe wear, and significant leakage.

Hydraulic pumps have high volumetric efficiency and small leakage, and can work under high pressure. They are mostly used in high-power hydraulic systems, but their structure is complex, requiring high materials and processing accuracy, high prices, and high requirements for oil cleanliness.

When the gear pump and vane pump in the hydraulic pump cannot meet the requirements, a plunger pump is used. It is a hydraulic component that provides pressurized liquid for hydraulic transmission. It is a type of pump, and the cam is driven by an electric motor to rotate. When the cam pushes the plunger upward, the sealing volume formed by the plunger and cylinder body decreases, and the oil is squeezed out of the sealing volume and discharged to the required place through a one-way valve.