Study on Screw Expander End Face Pressure Distribution and Shaft Seal Structural Parameters
To study the leakage characteristics of the suction end face of the screw expander,the influ-ence of structural parameters on the shaft seal leakage was investigated through the non-uniform end face pressure distribution model and the shaft seal leakage model.Taking the widely used labyrinth seal as an example,the influence of the four main structural parameters,namely tip clearance,cavity depth,cavity width and suction end face clearance,on the leakage of the shaft seal was analyzed.Results show that the shaft seal leakage increases with the increment of end face clearance and tip clearance and decreases with the increment of cavity width.And there exists an optimal depth-to-width ratio of about 0.16;the me-chanical end face clearance of screw expander has the greatest influence on the shaft seal leakage,fol-lowed by the tip clearance,cavity width and cavity depth.
screw expanderend face pressurestructure parametersleakageshaft seal
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