Design and Performance Study of an Automatic Compensation Wear High-Pressure Rotary Sealing Device

Abstract A rotary sealing device that automatically compensates for wear is designed to address the issues of easy wear and the short service life of the rotary sealing device with automatic wear compensation in mining machinery. After the end face of the guide sleeve wears out, it still tightly adheres to the sealing valve seat under the pressure difference, achieving automatic wear compensation. Based on fluid-solid coupling technology, the structural strength of the rotary sealing device was checked. The influence of factors on the sealing performance of rotary sealing devices was studied using the control variable method. The results show that as the pressure of water increases, the leakage rate of the sealing device decreases, and after 30 MPa, the leakage rate is almost 0 mL/h. The temperature of the rotating sealing device increases with the increase of rotation speed or pressure, and the temperature is more affected by the rotation speed factor. The frictional torque increases with increasing pressure and is independent of rotational speed. Comprehensive analysis shows that the wear resistance and reliability level of the sealing guide sleeve material is PVDF>PEEK>PE>PA. This study designs a high-pressure automatic compensation wear rotary sealing device and selects the optimal sealing material, providing technical support for the application of high-pressure water jet in mining machinery.