Study on the Influence of Flow Distribution Structure of Piston Pump on the Output of Pulsation Pump
Abstract
:1. Introduction
2. Working Principle of Valve Plate of Axial Piston Pump
3. Analysis of Output Flow Pulsation of Axial Piston Pump
3.1. Analysis of Output Flow Pulsation of Axial Piston Pump under Constant Working Conditions
3.2. Analysis of Output Flow Pulsation of an Axial Piston Pump in Practical Situation
3.2.1. Analysis of Oil Leakage in a Plunger Pump
3.2.2. Influence of Port Plate Structure on Output Flow Pulsation of Axial Piston Pump
- (1)
- Δφ/2 = = 6°, δz = 11 < δz = 10 < δz = 9 < δz = 8, that is, the larger the number of plungers, the smaller the pump output flow pulsation rate. The flow pulsation rate values are greater than the theoretical instantaneous flow pulsation rate, but the regularity is consistent with it. However, when Δφ/2 = = 1~5°, δz = 11 < δz = 9 < δz = 10 < δz = 8, that is, the output flow pulsation of odd pump is obviously less than that of even pump.
- (2)
- When Δφ/2 = decreases from 6° to 1°, the output flow curves of 8~11-piston pumps become more and more regular, the flow pulsation rate decreases gradually, the flow pulsation of odd number pump decreases faster than that of even number pump and the gap between them becomes larger and larger.
- (3)
- When Δφ/2 = = 1°, the flow pulsation rate of 8~11-plunger pumps reaches the minimum value, which is close to the theoretical value. When Δφ/2 = = 3°, the fluctuation of the difference of the pump flow pulsation rate of the number of adjacent plungers is the smallest. When Δφ/2 = = 5~6°, the flow pulsation rates of 9- and 10-plunger pumps are very close. Under this port plate structure, the number of plungers is designed as 9 or 10, which breaks the convention that odd piston pumps are better than even piston pumps.
4. System Modeling and Simulation Analysis of Axial Piston Pump
4.1. Modeling and Correctness Verification
4.2. Simulation Analysis of Influence of Port Plate Structure on Output Flow Pulsation of Axial Piston Pump
5. Experimental Verification
6. Conclusions
- (1)
- Without considering leakage and flow distribution, the output flow pulsation rate of an odd pump is obviously lower than that of an even pump. With the increase of the number of plungers, the pump output flow pulsation rate decreases. The larger the number of plungers, the slower the decreasing trend of flow pulsation.
- (2)
- The influence of the port plate structure on pump output flow pulsation under different flow distribution conditions was studied. It is more reasonable when the mismatching angle of the valve plate is 3~5° and the dead angle is 6~10°. At this time, the difference between the output flow pulsation of odd and even piston pumps is very small, and the odd or adjacent even number of pistons is appropriate. In the hydraulic pump hydraulic motor system, when the hydraulic pump is used as a hydraulic motor under the condition of power recovery, the odd number or adjacent even number of hydraulic motors are appropriate.
- (3)
- Through the comparison of the prototype pump bench test and simulation data, the correctness of the simulation conclusion was verified, which provides a reference for the design and improvement of the piston pump.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Z is an odd number | 5 | 7 | 9 | 11 | Z is an even number | 6 | 8 | 10 | 12 |
Pulsation rate δ1/% | 4.97 | 2.52 | 1.53 | 1.02 | Pulsation rate δ1/% | 14.03 | 7.66 | 4.97 | 3.45 |
Name | Numerical Value | Unit |
---|---|---|
Radius of plunger distribution circle | 29.7 | mm |
Prime mover speed | 1500 | r/min |
Plunger diameter | 17 | mm |
Inclined plate | 12.5 | degree |
Contact length between plunger and cylinder block | 34.6 | mm |
Viscous damping coefficient | 5 | Nm (rev/min) |
Coulomb friction torque loss | 3 | Nm |
Static friction torque loss | 7 | Nm |
Plunger pair fit clearance | 0.005 | mm |
Shoe pair clearance | 0.002 | mm |
Clearance of port pair | 0.01 | mm |
Moment of inertia of cylinder block | 0.0016 | Kgmm2 |
Initial tank pressure | 2 | bar |
Maximum opening diameter of oil drain throttle valve | 2.9 | mm |
Maximum opening diameter of oil suction throttle valve | 4.3 | mm |
Name | Simulation Value | Experimental Value |
---|---|---|
9 plunger pump | 6.56 | 7.45 |
10 plunger pump | 7.91 | 8.65 |
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Li, R.; Liu, J.; Ding, X.; Liu, Q. Study on the Influence of Flow Distribution Structure of Piston Pump on the Output of Pulsation Pump. Processes 2022, 10, 1077. https://doi.org/10.3390/pr10061077
Li R, Liu J, Ding X, Liu Q. Study on the Influence of Flow Distribution Structure of Piston Pump on the Output of Pulsation Pump. Processes. 2022; 10(6):1077. https://doi.org/10.3390/pr10061077
Chicago/Turabian StyleLi, Ruichuan, Jilu Liu, Xinkai Ding, and Qi Liu. 2022. "Study on the Influence of Flow Distribution Structure of Piston Pump on the Output of Pulsation Pump" Processes 10, no. 6: 1077. https://doi.org/10.3390/pr10061077