Abstract
Raising the rotational speed is an effective way to improve the power density of axial piston pump, but high rotational speed tends to cause plunger cavity and valve plate throttling groove cavitation. The cavitation of axial piston pump must reduce its volumetric efficiency and cause vibration and noise. In order to reduce the cavitation of axial piston pump and improve the performance of axial piston pump, the optimization of anticavitation structure parameters of cylinder block and valve plate throttling groove is studied in this paper. Firstly, according to the condition of no cavitation in the piston cavity fluid, the mathematical model of the ratio of plunger cavity diameter to axial piston pump cylinder block kidney hole hydraulic diameter is established. It is found that when the ratio is small, the cavitation degree of the piston cavity is weakened. Secondly, this paper analyzes and studies the influence of the valve plate triangular throttling groove structure parameters on the cavitation flow of the triangular throttling groove. It is found that reducing the structural parameters γ or θ can reduce the cavitation intensity of the triangular throttling groove fluid. Finally, combined with the analysis result of the ratio of piston cavity between the piston cavity diameter and the cylinder block kidney hole hydraulic diameter and the research results of the anticavitation of the valve plate triangular throttling groove, the optimized structure of anticavitation of the axial piston pump is proposed, and the simulation results show that the improved axial piston pump has better anticavitation performance.
Highlights
An axial piston pump is the power source and the heart of the hydraulic system. e main performance indexes of an axial piston pump are outlet flow stability, cavitation, vibration, noise, volumetric efficiency, and so on
Cavitation is one of the main factors that affect the function of an axial piston pump. e plunger cavity and triangular throttling groove cavitation must result in a reduction of an axial piston pump volumetric efficiency and an increase of its vibration. e cavitation at the interface between the cylinder block and valve plate that could cause the valve plate wear was studied by Zecchi and Ivantysynova [1]. e axial piston pump cavitation that could cause the flow pulsation increase was studied by Zhang [2]. erefore, it is critical to study the plunger cavity and triangular throttling groove cavitation mechanism and to explore the method of decreasing or eliminating the axial piston pump cavitation
Liu et al [16] believed that an axial piston pump cavitation was affected by many factors, such as the rotation rate of the cylinder block, inlet pressure, and the valve plate geometry
Summary
An axial piston pump is the power source and the heart of the hydraulic system. e main performance indexes of an axial piston pump are outlet flow stability, cavitation, vibration, noise, volumetric efficiency, and so on. Bergada et al [10] concentrated on the study of the influence of the plunger cavity and valve plate structure on the axial piston pump cavitation. Liu et al [16] believed that an axial piston pump cavitation was affected by many factors, such as the rotation rate of the cylinder block, inlet pressure, and the valve plate geometry. Wang [25] established the mathematical model between the plunger cavity pressure and cylinder barrel rotation angle and got the optimized geometry structure of the valve plate which could increase the anticavitation performance of an axial piston pump. E goal of the paper is to study the valve plate and cylinder block geometry effect on anticavitation in an axial piston pump using theoretical and finite volume simulation methods. Its structure is shown in Figure 1. e inclination angle of the swash plate is 15°. e cross angle of α is 4°. e number of the pistons is 9; that is, i 9. e piston diameter is 21 mm. e nine-piston distribution circle diameter is 81 mm. e content of this paper mainly included several aspects: (1) e ratio equation of the cylinder block kidney shape hole hydraulic diameter to the plunger cavity diameter is established for no plunger cavity cavitation. (2) e influence of the valve plate triangular throttling groove geometric parameters on an axial piston pump cavitation is studied, and the axial piston pump anticavitation structural optimization scheme is put forward
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