Abstract
To improve the performance of the intra-vane type pump and optimize the friction characteristics of the three friction pairs related to the vane cavity, theoretical analysis, numerical simulation, and experimental testing are used to study the mechanism of oil temperature rise in the sealed cavity of the vane pump. First, the heat generation source and heat dissipation routeways of the oil in the oil suction and oil discharge regions are analyzed, respectively. Thermodynamic modeling is conducted based on the principle of heat transfer. Then, the oil temperature rise caused by each heat generation source was simulated using the thermodynamic model. The influence of each heat generation source and heat generation route on the oil temperature rise change was analyzed and compared. Finally, a test system for oil temperature rise is designed, and the temperature changes at six positions of the experimental pump when working at three pressures are measured through experiments. Based on simulation and experimental results, the mechanism of oil temperature rise in the sealed cavity of the intra-vane type pump is analyzed and discussed. The experimental results show that the established thermodynamic model is very anastomotic to the experimental results. The experimental test value of temperature rise is greater than the calculated value. When the outlet pressure is 6 MPa, the maximum temperature rise of the theoretical calculation is 2 °C. Meanwhile, the maximum temperature rise of the experimental analysis is 3.5 °C. The maximum difference of temperature rise between theoretical calculation and experimental test is 1.5 °C. Therefore, the model can effectively predict the oil temperature rise in the sealed cavity of the intra-vane type pump and provide theoretical guidance for the design of similar pumps.
Highlights
The friction between the tip of the vane and the inner ring of the stator, the friction between the vane and the rotor slot, and the friction between the valve plate, rotor, and stator are the three pairs of frictions of the vane pump
The sealed cavity consists of two adjacent vanes of the vane pump that passes through the oil suction and discharge regions
The analysis shows that the temperature rise caused by the orthogonality of the differential pressure flow and the shear flow has a greater impact on the temperature rise of the sealed cavity oil, the temperature rise caused by the orthogonality accounts for the total oil temperature as the pressure increases
Summary
The friction between the tip of the vane and the inner ring of the stator, the friction between the vane and the rotor slot, and the friction between the valve plate, rotor, and stator are the three pairs of frictions of the vane pump. The sealed cavity consists of two adjacent vanes of the vane pump that passes through the oil suction and discharge regions. The oil in the sealed cavity cannot complete the circulation well in each oil suction and discharge cycle. It will absorb much of the heat generated by the friction pair. This part of the heat cannot be dissipated instantaneously, resulting in excessive oil temperature. Excessive oil temperature will decrease the viscosity of the oil. It can cause the working environment of the parts in the pump to become harsh
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