Cause analysis of hydraulic pump failure in hydraulic system
The hydraulic pump is the power source of the hydraulic system, and it is an energy conversion device that converts mechanical energy into hydraulic energy. In the hydraulic system, the hydraulic pump is also the component with the most failures, and once the hydraulic pump fails, it will immediately affect the normal operation of the hydraulic system, or even fail to work. Today, Guangdong Yihe Hydraulics will briefly talk about the cause of the failure of the hydraulic pump.
Most of the common failures of gear pumps are caused by the wear of their internal friction pairs. Its normal wear increases the radial clearance and axial clearance (that is, the section clearance), which aggravates the internal leakage of the gear pump. In severe cases, the holes in the pump body or the two side plates cannot be repaired. Furthermore, the seal of the shaft is also a frequently damaged component.
The vane pump is different from the gear pump, its normal wear is small, and the service life of the parts is long. The main cause of the failure of the vane pump is oil pollution. This is because the kinematic pair of the vane pump is closely matched. When the pollutant enters the friction pair, it is prone to abnormal sticking or wear. In addition, the self-priming performance of the vane pump is not as good as that of the gear pump, especially the vane pump with small displacement. Therefore, whether the oil is clean and whether the oil absorption is smooth are two issues that need special attention during the operation of the vane pump.
The weakness of the radial piston pump in the piston pump in terms of structure and motion performance is that the radial force is large, the self-priming ability is poor, and the matching precision between the plunger and the plunger hole is high; the parts processing of the axial piston pump High precision is required. Therefore, the piston pump has higher requirements on the cleanliness of the oil, that is, the piston pump has higher requirements on the filtration accuracy of the oil than the gear pump.
