Studies on the Characteristics of Axial Plunger Pumps and Motors : 1st Report, Effects of Trapping Phenomena on the Characteristics
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概要
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In order to apprehend the characteristics of axial plunger pumps and motors, it is very important to investigate their trapping phenomena thoroughly. For this purpose this paper gives the formula to calculate the pressure change in a cylinder during a trapping period in which a liquid flow from a cylinder is considered, and makes clear the effect of relief grooves, shaft speeds and inertia of the liquid in a cylinder on the trapping pressure. Then the efficiencies of pumps and motors are defined in consideration of the compressibility of liquid, trapping and relief grooves. Using this definition, power losses due to trapping are estimated, and then it becomes possible to decide the relief groove which is effective to reduce not only vibrations and noises due to trapping but also power losses.
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