Abstract
This paper describes the design of a swash plate axial piston pump and the theoretical models describing the bulk modulus of aerated and non-aerated fluids. The dead space volume is defined and the influence of this volume and the fluid compressibility on the volumetric efficiency of the pump is considered. A displacement of the swash plate rotation axis is proposed to reduce the dead space volume for small swash plate swing angles. A prototype design of a pump with a displaced axis of rotation of a swash plate with two directions of delivery is presented, in which the capacity is changed by means of a valve follow-up mechanism. Comparative results for a pump with a displaced and a non-displaced swash plate rotation axis are presented, which confirm that displacement of the swash plate rotation axis causes an increase in volumetric efficiency that is apparent for high pressure discharge and small swash plate angles. The determined characteristics were compared with a mathematical model taking into account the compressibility of the fluid in the dead space volume and a satisfactory consistency was obtained.
Highlights
Introduction of Rotation on the VolumetricThe history of axial piston pumps begins with Cooper and Hampton’s 1893 design [1], which was revised and put into production by Williams and Janney 10 years later
The efficiency of axial piston pumps depends on the swing angle of swash plate and is zero for a swash plate which is vertical to the shaft axis
When the working fluid is expanded into the suction collector window, a volume ∆Vc is again sucked into the cylinder chamber, reducing the amount of new fluid sucked from the suction collector and affecting the apparent reduction in stroke volume
Summary
The history of axial piston pumps begins with Cooper and Hampton’s 1893 design [1], which was revised and put into production by Williams and Janney 10 years later. The flow rate generated by the pump is pulsed due to the unpaired number of pistons and their variable speed [6] This phenomenon is influenced by other factors such as the inertia of the fluid and the swash plate profile and control method described in [7,8,9,10]. The inoccurring for small swash plate swing angles, the compressibility of the working fluid has fluence of grooves on the piston on the conditions of hydrodynamic lubrication is dea significant effect on the volumetric efficiency [35]. The oil accumulated in this space expands into the suction channel causing reverse flow and limiting the volumetric efficiency of such pumps The effect of this phenomenon on the volumetric efficiency is evident for high discharge pressures and small swash plate swing angles [32,36]. The obtained results provided an impulse to create a new design of pump that could be applied in closed and open loop industrial hydraulic systems
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