Modeling and theoretical study of relief chamfer method for reducing the flow ripple of a spool valves distribution radial piston pump

Guo, Tong; Lin, Tianliang; Chen, Miao; Zhao, Sheng

doi:10.1177/0954406220965629

Cited by 5 publications

(6 citation statements)

References 14 publications

(15 reference statements)

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“…The maximum velocities for each opening of the discharge valves, occurring near the outflow port, as shown in Figure 10, vary from approximately 12.1 to 14.5 m/s, indicating that each opening of the discharge valve is accompanied by flow ripples. Similar findings were reported by Guo et al 9 for a spool-valve-distribution RPP. The pressure difference between the discharge valve and the piston chambers in the discharge circuits is negligible, as shown in Figure 11.…”

Section: Cfd Simulation For the Suction And Discharge Circuitssupporting

confidence: 91%

Design and experimental validation of a valve-distributed water radial piston pump

Li,

Wei,

Liu

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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In underground coal mining, there is an urgent need for reducing the noise, hydraulic shock, and leakage of reciprocating pumps. Flow pulsation is strongly dependent on the number of pistons for single-acting reciprocating pumps. Water hydraulic radial piston pumps (RPPs) allow the pistons to be radially distributed, which makes the multi-piston design easier compared to traditional single-acting reciprocating piston pumps. In this study, a novel valve-distributed water RPP was developed in which the star wheel assembled on the camshaft is used to drive the connecting rod-crosshead-piston assembly and realize the reciprocation of the piston and suction-discharge of the pump check valves. Mathematical and numerical models representing the RPP were built using MATLAB and AMESim, respectively. Three-dimensional computational fluid dynamics analyses were performed to investigate the internal flow field of the suction and discharge circuits as well as the flow characteristics of the discharge valve opening. A prototype pump was manufactured and tested for 200 h and then disassembled to evaluate the wear condition. The tested instant flow rates were lower than those obtained from the theoretical and simulation analyses. The experimental results also revealed that the average flow rates were almost independent of the output pressure and that the volumetric efficiency decreased with increasing rotational speed when the output pressure was larger than 25 MPa. Inspecting the disassembled water RPP revealed that scuffing problems occurred in the pistons, whereas the other components remained intact. The findings of this study offer a reference for water hydraulic power units in various applications and for investigating the intensity of water hydraulics.

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Section: Cfd Simulation For the Suction And Discharge Circuitssupporting

confidence: 91%

Design and experimental validation of a valve-distributed water radial piston pump

Li,

Wei,

Liu

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…According to formula (9), the equation of the plane where the bottom surface of the slipper lies can be deduced as follows:…”

Section: Oil Film Thickness Field Model Of Slipper Pairmentioning

confidence: 99%

“…), and the high requirements for sealing performance, the valve distribution piston pump will be more used to achieve high pressure and high efficiency. [8][9][10] The traditional axial piston pump is that the cylinder rotates, and the piston reciprocates under the action of a fixed swashplate to realize the process of oil suction and discharge. The valve distribution axial piston pump is that the swashplate rotates while the cylinder does not move, and the most direct difference for the stress of the slipper pair is that the centrifugal force is eliminated.…”

Section: Introductionmentioning

confidence: 99%

Lubrication characteristics analysis of slipper pair of digital valve distribution axial piston pump

Zhao

Wang

et al. 2022

Advances in Mechanical Engineering

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The digital valve distribution axial piston pump is a swashplate rotary piston pump, the force on slippers is different from that of traditional axial piston pump. At the same time, the control strategy of the distribution valve will affect the pressure in the piston cavity, and then affect the oil film lubrication. According to these characteristics, the modeling method of oil film thickness field was proposed, and the force model of slipper pair and the numerical solution model of oil film lubrication of digital valve distribution axial piston pump were further established. The influence of swashplate rotation speed, swashplate inclination angle, and distribution valve control strategy on the characteristics of oil film lubrication were solved. The results show that the established thickness field model of oil film conforms to the stress characteristics of the slipper of the valve distribution pump. Increasing the swashplate rotation speed and the swashplate inclination angle is beneficial to optimize the oil film lubrication performance. The discharge valve should be opened in advance or closed in delay, which is beneficial to prevent eccentric wear and adhesion wear of slippers. The research results can provide theoretical basis for the optimal design of valve distribution axial piston pump.

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“…The simulation findings have been compared to the outcomes of the experiments. Guo et al [15] designed a relief groove for a radial piston pump's spool valve to reduce flow ripple at higher pressures. Dong et al [16] devised a valve plate for a radial piston pump, which reduced friction between slipping shoes and the pump's stator while fine-tuning flow pulsation at various speeds and pressures.…”

Section: Introductionmentioning

confidence: 99%

“…In figure 4 shown the flow from 1st piston cylinder to silencing groove 3 is defined as Q g31 through the area A g3 . The flow interaction between silencing groove and ith piston cylinder barrel can be written as [15] (…”

mentioning

confidence: 99%

Analysis of pressure at transition zone of valve plate of radial piston pump

Kumar

Mandal

2022

Eng. Res. Express

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In present studies focuses on the characteristics of flow-pressure of piston cylinder barrel and silencing groove chambers near the transition zone of valve plate of a fixed displacement radial piston pump. The designing of silencing groove of valve plate of the pump is carried out with appropriate geometrical configuration, compute the orifice area of piston kidney over the silencing grooves and manifolds, the interaction area make a key role in fluid flow interaction. The pressure and flow of pump is analyzed in consideration the silencing groove as separate control volume from manifold, each silencing groove chamber is connected to the both end of the manifold chamber, the shape of the silencing groove is an asymmetric tetrahedron. The radial piston pump is modelled in simulation with consideration of five pump pistons barrel, analyses the pressures near at transition zone with different bridge angle. The flows interaction of pump piston cylinder barrel with silencing groove chamber and manifold chamber are also carried out. The overall pump volumetric efficiency, flow and pressure fluctuation of radial piston pump are analyzed to optimize the pump.

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Modeling and theoretical study of relief chamfer method for reducing the flow ripple of a spool valves distribution radial piston pump

Cited by 5 publications

References 14 publications

Design and experimental validation of a valve-distributed water radial piston pump

Design and experimental validation of a valve-distributed water radial piston pump

Lubrication characteristics analysis of slipper pair of digital valve distribution axial piston pump

Analysis of pressure at transition zone of valve plate of radial piston pump

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