Analysis and study on the failure of the seal of the hybrid driving shaft of the plow blade
In response to the failure of the dynamic shaft seal when the working medium of the plow blade mixer is powder material,the failure cause analysis is first carried out based on the results of the dynamic shaft seal test and the principle of the dynamic shaft seal.The analysis results indicate that:The outlet pressure of the sealing gas is greater than the working medium pressure;The outlet pressure of the sealing gas is uniform along the circumferential direction;The uniformity of the width dimension b along the circumferential direction of the airtight sealing channel is the key to ensuring the sealing performance of the plow blade mixer shaft.On this basis,a combination of theoretical calculation and finite element simulation was used to further analyze the reasons for the failure of the dynamic shaft seal.Based on the analysis results,solutions for the failure of the plow blade hybrid dynamic shaft seal were proposed from the perspectives of the design and manufacturing of the driven shaft seal;Finally,the correctness of the solution was verified through experiments.The experimental results showed that,under the condition that the gas outlet pressure of the dynamic shaft seal and the design of the gas distribution ring meet the requirements,the continuous sealing time of the gas seal channel width dimension b with an eccentricity of 0.1 mm along the circumferential direction is 3 times and 13 times that of the eccentricity of 0.3 mm and 0.6 mm,respectively,Reducing the eccentricity of the width dimension b of the gas sealing channel along the circumferential direction has a significant effect on improving the sealing performance of the dynamic shaft sealing device.The research results have certain guiding significance for the design and application of the seal for the hybrid shaft of plow blades.
plow blade mixerdynamic shaft sealpowder materialscause analysisexperimental research
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