Study on flow characteristics and flow ripple reduction schemes of spool valves distributed radial piston pump

Abstract

This paper studies the flow characteristics and flow ripple reduction techniques of a spool valves distributed radial piston pump. The mathematical models of the pump are established, and simulations based on the mathematics are performed in AMESim environment. The results indicate that the spool valves distributed radial piston pump has fewer flow fluctuations than the pump distributed by check valves, due to the rigid motion of its distribution component—the spool valves. Then, in order to reduce the flow ripple of the spool valves distributed radial piston pump, three techniques, namely, time delay, relief chamfer and transition compression filter volume, are proposed and their working principles are illustrated. Particularly, the design method of time delay is elaborated and its effectiveness is evaluated. The simulation results suggest that with the usage of the time delay method, the fluctuation range of the spool valves distributed radial piston pump is expected to be reduced by 21.7%.

Keywords

Radial piston pump spool valve flow characteristics flow ripple reduction time delay

Get full access to this article

View all access options for this article.

References

Bishop

. Handbook of lubrication and tribology, Vol. I application and maintenance, 2nd ed. Chapter 10. Basic hydraulic pump and circuit design. Boca Raton: CRC Press, 2006, pp. 10–14.

Helgestad

. Pressure transients in an axial piston hydraulic pump. J Proc Instn Mech Engrs 1974; 188: 189–199.

Manring

. The discharge flow ripple of an axial-piston swash plate type hydrostatic pump. J Dyn Syst Meas Contr 2000; 122: 263–268.

Ericson L. On fluid power pump and motor design: tools for noise reduction. PhD thesis, Linköping University Electronic Press, Sweden, 2011.

Mandal

. Effects of flow inertia modeling and valve-plate geometry on swash-plate axial-piston pump performance. Proc IMechE, Part I: J Systems and Control Engineering 2011; 226: 451–465.

. Simulation research on distribution method of axial piston pump utilizing pressure equalization mechanism. Proc IMechE, Part C: J Mechanical Engineering Science 2013; 227: 459–469.

Manring

. Valve-plate design for an axial piston pump operating at low displacements. J Mech Des 2003; 125: 200–205.

Mandal

. Theoretical simulation of ripples for different leading-side groove volumes on manifolds in fixed-displacement axial-piston pump. Proc IMechE, Part I: J Systems and Control Engineering 2008; 222: 557–570.

Pettersson M, et al. Methods of reducing flow ripple from fluid power piston pumps – a theoretical approach. In: Proceedings of SAE international off-highway & power plant congress, Milwaukee, USA, September 1991.

10.

Pettersson M, et al. Reduction of flow ripple from fluid power piston machines by means of a pre-compression filter volume. In: Proceeding of 10th aachen colloquium on fluid power technology, Aachen, Germany, 17–19 March 1992.

11.

Pettersson M. Design of fluid power piston pumps with special reference to noise reduction. PhD thesis, Division of Fluid Power Technology, Department of Mechanical Engineering, Linköping University, Sweden, 1995.

12.

. Pre-compression volume on flow ripple reduction of a piston pump. Chin J Mech Eng 2013; 26: 1259–1266.

13.

Harrison

Edge

. Reduction of axial piston pump pressure ripple. Proc IMechE, Part I: J Systems and Control Engineering 2000; 214: 53–64.

14.

Harrison AM. Reduction of axial piston pump pressure ripple. PhD thesis, University of Bath, UK, 1997.

15.

Zhao SD, Guo T, et al. A double row spool valves distribution hydraulic retrieving radial piston pump. (Patent No. 2014101511095). Available at: http://epub.sipo.gov.cn/tdcdesc.action?strWhere=CN103939311A (2014, accessed 30 July 2015).

16.

Zhuangyun

. Hydraulic component and system, 3rd ed. Beijing: China Machine Press, 2011, pp. 120–123.

17.

Piacenti

. Piston machines, Springer handbook of mechanical engineering, Berlin, Heidelberg: Springer, 2009, pp. 879–945.

18.

Wanglong

. Hydraulic motor: handbook of usage and maintenance, Beijing: Chemical Industry Press, 2011, pp. 290–290.

19.

HYDROWATT Company. Pump technology, http://www.hydrowatt.com/ (accessed 30 July 2015).

20.

Yanghu

Shengdun

ZHAO

. Study on relationship between number of piston pump and output fluctuation. China Metal forming Equipment & Manufacturing Technology 2011; 4: 79–82.

21.

Akers

. Steady state modeling. Hydraulic power system analysis, Boca Raton: CRC Press, 2006, pp. 39–39.

22.

Jianzhong

. Fluid mechanics, Beijing: Tsinghua University Press, 2005, pp. 266–266.

23.

Siemens, LMS Imagine. Lab AMESim, http://www.plm.automation.siemens.com/en_us/products/lms/imagine-lab/index.shtml (accessed 30 July 2015).