Abstract
To analyze the deflector-jet servo valve’s internal flow characteristics, a theoretical model of the complicated flow distribution in the deflector plate is established based on the offset jet attachment theory. When the deflector plate offsets, jet attachment parameters are attained to figure out the jet’s bending and colliding process. On this basis, an analytical method of acquiring the pilot valve’s pressure gain is derived. According to an actual pilot stage’s structure, pressure gain calculations are carried out. Meanwhile, the pilot valve’s mesh model is established for numerical simulation in order to examine the accuracy of the theoretical model. Calculation and numerical simulation show that the final oil jet is not sensitive to the deflector plate’s movement, which directly reveals the pressure stabilizing effect of the V-shaped structure on the deflector plate. Moreover, the experiment on the pressure gain is accomplished and experiment results verify the accuracy of the analytical calculation.
Highlights
The deflector-jet servo valve (DJSV) is derived from the jet-pipe servo valve, composed of a torque motor, a deflector-jet pilot stage amplifier and a valve
Yang [11] finished numerical simulations and visualized experiments on different pilot stage’s flow distributions and found that it was easier to flow along the flat cutting structure in two receiver entrances of the jet pan
The researches can mostly be divided into two parts: firstly, a novel theoretical model of pilot stage’s flow is built based on offset jet attachment theory
Summary
The deflector-jet servo valve (DJSV) is derived from the jet-pipe servo valve, composed of a torque motor, a deflector-jet pilot stage amplifier and a valve. As to jet-pipe valves, Pham [1, 2] derived theoretical formulas of the pilot stage’s flow distribution, and Shang [3] and Li [4] finished analysis based on CFD simulation. Yin [5] and Li [6] respectively accomplished complete theoretical models and numerical simulations, in which the jet-pipe valve’s various characteristics were discussed. Yang [11] finished numerical simulations and visualized experiments on different pilot stage’s flow distributions and found that it was easier to flow along the flat cutting structure in two receiver entrances of the jet pan. The researches can mostly be divided into two parts: firstly, a novel theoretical model of pilot stage’s flow is built based on offset jet attachment theory. A pressure gain experiment is designed to verify the theoretical model’s accuracy
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