Flow Field Modeling and Simulation of High-Speed Gear Pump Considering Optimal Radial and End Clearance

The end clearance and radial clearance of the gear pump are the most important factors affecting its internal leakage and viscous friction loss, and also the most important factors affecting the total efficiency of a high-speed gear pump. The reasonable value of radial clearance and end clearance is the decisive condition for the high-efficiency performance of high-speed gear pumps. Based on a certain type of high-speed gear pump with a speed of 6000 r/min, the influence of end clearance and radial clearance on internal leakage and viscous friction loss of the gear pump is analyzed under the rated working condition of outlet pressure of 8 MPa. The flow field simulation model of the high-speed gear pump with oil flowing in radial clearance and end clearance is established in PumpLinx. The oil leakage flow rate and pump shaft power under different radial and end clearances are analyzed. The results show that under the condition of 6000 r/min, the phenomenon of insufficient oil filling in the tooth groove is produced, and the radial clearance is 0.16 mm when the total efficiency of the high-speed gear pump is the largest. Under the optimal radial clearance, the working characteristics of gear pumps with different end clearances are analyzed. The end clearance is 0.03 mm when the total efficiency of high-speed gear pumps is the largest. In this paper, the selection of radial and end clearance of high-speed gear pump and the internal flow of different clearances are analyzed, which has important theoretical significance and engineering practical value.