The Structure Design And The Fluent Analysis On Bilateral Plunger Pump With Single Inclined Plate And Complex Phase

Plunger pump is the power source of the hydraulic system, and it is thecomponent of whole mechanical device, is the conversion device with energy.Because of its high volumetric efficiency, low weight, small leakage, the highpressure during normal operation, easy to variables, etc. The technology has beenwidely applied in various fields. However, in its application, it will result in theinstability of output pressure, large leakage volume, high mechanical noise andoil-way fatigue damage as a result of its own structure and working principle, thesecaused defects attaches great importance to industry experts. Therefore, to solve thehazards of plunger pump resulted from the output flow pulsation, and to design theplunger pump which owns a high output pressure, small leakage volume, low outputflow pulsation is of great significance.Due to the high, low pressure-oil cavity structure of the plunger pump, andworking principle of oil absorption that the change of internal oil cavity volumeresults in the change of the pressure, the form of trigonometric curve in the flow of itsoutput causes the output flow pulsation. When the work-loading is increased, it causespressure instability. Thus completely avoiding pressure pulsations due to their ownworking structures cannot be achieved. This article from the analysis of internalstructure and curve shape of the outputting instantaneous flow put forward designconcept reducing the flow pulsation to improve internal structure of the plunger pumpand reduce instantaneous flow pulsation of the plunger pump.According to output flow formula of the plunger pump, it can be concluded thatits instantaneous flow curve is similar with the trigonometric function curve.According to the superposition principle of mathematic trigonometric function curve,the article puts forward the design concept of bi-directional plunger pump with Singleinclined plate and complex phase, which can improve its internal plunge, thedistribution of the oil cavity, and the structure of inclined plate. It also designs a newtype of bi-directional plunger pump with Single inclined plate and complex phasewhich effectively improves the output flow pulsation and increase the output pressurein normal working conditions. According to the output flow formula of normal axial piston pump, we canconclude that the instantaneous flow curve of the plunger pump is trigonometricfunction curve and has the maximum and minimum values, thus it will cause the flowpulsation. Thus reducing the amplitude variation of instantaneous flow can reduce theoutput flow pulsation, this paper cites the mathematical principle that two periodictrigonometric function curve being staggered in half cycle phase superposition canincrease amplitude and reduce the amplitude change, assumption that theinstantaneous output flow of two plunger pump, being staggered for half cycle, canincrease the instantaneous flow and will also reduce the flow pulsation.Designing the hardware and software to finish the experimental facility whichuses two the same model and parameter piston pumps whose phase difference is halfcycle by parallel connection and synchronous working, it calculates the magnitude ofexporting instantaneous flow rate and flow ripple, and verifies the rationality that theexperimental facility could decrease flow fluctuation. Through a mass of experimentaldata a conclusion could be drawn that the instantaneous flow rate of two piston pumpswhose phase difference is half cycle by parallel connection is higher than singlepiston pump, but the flow fluctuation is lower.According to the theoretical analysis and experimental verification above, thearticle designs a kind of bi-directional plunger pump with single inclined plate andcomplex phase and analyzes its structure by software of Fluent.(1) According to thetheory that two piston pumps with different phase by parallel connection, the articleimprove the structure of inclined plate and the distribution of valve plate and inneroil-way of axial piston pump, and design a new complex phase andbi-directional plunger pump. By means of math calculation, a conclusion could bedrawn that the instantaneous flow fluctuation of the new structure is quartercomparing with the traditional structure. The complex angle of left piston with rightpiston about the bi-directional plunger pump determines the maximum of flowfluctuation.(2)The article analyses the instantaneous flow of bi-directional plunger pumpwith Single inclined plate and complex phase by Simulink software. According to theoutput flow formula, build model in the software of Simulink, and simulate theinstantaneous flow curve. Comparing with the instantaneous flow curve of signalpiston pump, a conclusion could be drawn that the maximum instantaneous flow ofbi-directional plunger pump with single inclined plate and complex phase is one times higher than traditional axial piston pump and its flow fluctuation is quarter thantraditional one.Apply the fluent software to simulate the fluid experiment of bi-directionalplunger pump with Single inclined plate and complex phase. By setting conditionparameters of input and output, simulate flow of oil in bi-directional plunger pumpwith single inclined plate and complex phase. The inner pressure deflectable andcurve of mass of rate about output could be reached. Comparing with the analysis oftraditional axial piston pump by fluent software, the flow fluctuation of traditionalpiston pump is higher than it.