The size of the end face clearance of the gear pump directly affects the discharge pressure, volumetric efficiency and flow rate of the gear pump. The specific analysis is as follows:
1. At the same speed, the hourly average mass flow and volumetric efficiency of the gear pump decrease significantly with the increase of the gear pump end face clearance; under the same end face clearance, the hourly average mass flow and volumetric efficiency of the gear pump increase with the gear pump speed And increase.
2. The high-speed area of the gear pump end face clearance leakage is in the meshing part, which proves that the inlet and outlet pressure difference of the gear pump is the main cause of clearance leakage. As the end face clearance increases, the leakage flow rate between the clearances also increases. Increase the leakage flow rate, resulting in a decrease in the volumetric efficiency of the gear pump.
3. The size of the gear pump end face clearance has no obvious influence on the pulsation of the gear pump flow.
4. As the speed of the gear pump increases, the impact of the increase of the end face clearance on the volumetric efficiency decreases. The areas with high speed in the end-face clearance leakage are distributed at the meshing part of the gear pump, which indicates that the clearance leakage is caused by the pressure difference between the inlet and outlet of the gear pump. The high-pressure medium in the outlet area is pressed back to the inlet area through the end-face clearance, forming an end-face clearance Vent. With the increase of the end face clearance of the gear pump, the leakage velocity between the clearances also increases, which results in an increase in the leakage flow, which leads to a decrease in the volumetric efficiency of the pump.
