| Summary: | 博士 === 中原大學 === 機械工程研究所 === 103 === Abstract
Either constant-flow valve or pump is designed for supplying constant flow to compensate recess pressure when load changes. Because of the difference in device complexity, the cost of the former is lower than that of the latter. The constant-flow valves can compensate pressures of bearing recesses as load fluctuates and the flow rate can be constant in spite of the pressure changes in recesses. However, a specific relationship among design parameters must be complied in valve design for constant-flow. This thesis utilizes an analytical method is chosen for studying the static and dynamic characteristics of constant-flow valves, and the three kind of traditional design of constant-flow valves are reviewed afresh. Moreover, an innovative design for constant-flow valve is presented. The analysis of results reveal that appropriate relationships among design parameters for these kind valves, except the third traditional valve cannot be constant-flow.
This thesis which studies an analytical method is used to determine the variations of the flow rate due to recess pressure fluctuation. The results give the variation spectra around the constant flow rates and various pressure ranges for their availability of different valves. Additionally, this study uses analytical results to compare dynamic behavior among various designs of valves. The result of this thesis reveals both double-piston types have the same static characteristics, but the dynamic characteristics by single feedback are better than double feedback. While both static and dynamic characteristics of the spool-type surpass both double-piston types.
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