Sealing Performance and Optimization of Maintenance Free Bearing of Beam Pumping Unit
The lubrication and sealing performance of the maintenance free tail bearing(sealed self-aligning roller bearing)of the beam pumping unit designed based on conventional experience cannot effectively apply to the unique swing and crank scissors difference working conditions of the pumping unit.In order to reasonably determine the grease filling amount and radial wring of seal ring of the maintenance free tail bearing,taking the maintenance free tail bearing of a beam pumping unit as the research object,the finite element calculation method was used to establish a calculation model for the grease and air two-phase flow in the fluid domain of the bearing under swing conditions.The influence of grease filling amount on the distribution of grease in the bearing chamber was ana-lyzed,and the optimal grease filling lubrication scheme was proposed.The stress distribution of the seal ring of the maintenance free tail bearing under the interference state and field working conditions(crank scissors difference)was calculated and optimized to meet the seal requirements under the optimal grease filling amount.The research results show that in order to ensure sufficient lubrication of the bearing rollers and the sealing performance of the seal ring under interference and crank scissors difference states,the optimal grease filling amount for maintenance free tail bearing is 70%-90%,and the radial wring between the seal ring and the bearing inner ring is 0.25 mm.The test results show that the optimized maintenance free tail bearing meets the seal requirements.The research re-sults provide theoretical support for the design of maintenance free bearing of the beam pumping unit.
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