微型涡旋压缩机轴向力曲线匹配吸力足机构优化研究

Suction foot mechanism optimization for axial force curve matching of miniature scroll compressors

微型涡旋压缩机的轴向气体力随主轴转角而大幅度变化,存在难以实现良好的轴向密封等问题,为此,提出了一种基于永磁体的轴向磁力平衡轴向气体力的吸力足机构。首先,对微型涡旋压缩机的轴向气体力进行了特性分析,确定了目标轴向气体力曲线;其次,基于JMAG建立了三维仿真模型,采用遗传算法对永磁体的位置进行了优化,由此达到了轴向力变化趋势最大的目标;再次,在永磁体位置优化基础上,提出并对比了4种不同的吸力足分块方案,改变了分块吸力足的高度来匹配随动涡盘平动而变化目标的轴向力曲线;最终,对选择方案的分块吸力足高度敏感性进行了分析,固定了敏感性低的分块高度,降低了实际制作和装配的复杂性;通过仿真和实验测试,对优化后吸力足机构轴向力的准确性进行了验证。研究结果表明:改变永磁体在静环的位置,轴向力的最大值提升27.56%;在所有分块方案中,分块数越多,吸力足机构平衡效果越佳,且周向切割优于径向切割,周向切割最优结构的积分差相较于径向切割方案减小了42.91%;经实验验证后,优化的吸力足机构的最大误差仅为6.2%,与仿真结果具有良好的一致性,很大程度上解决了微型涡旋压缩机的轴向密封问题。

The axial gas force of a miniature scroll compressor varies significantly with the crankshaft angle,posing challenges for achieving effective axial sealing.To address this issue,a suction foot mechanism that used the axial magnetic force of a permanent magnet to balance the axial gas force was proposed.Firstly,the axial gas force characteristics of the miniature scroll compressor were analyzed to determine the target axial force curve.Secondly,a three-dimensional simulation model was established based on JMAG.The position of the permanent magnets was optimized by genetic algorithm to achieve the goal of the maximum trend of axial force change.Then based on the position optimization of the permanent magnets,four different suction foot blocking cases were proposed.It could adapt to the axial force curve that changed with the orbiting scroll disk s translation.Finally,a sensitivity analysis of the blocking suction foot heights for the final choice option was performed,fixing the height of the block with low sensitivity reduced the complexity of actual fabrication and assembly.The accuracy of the axial force of the optimized suction foot mechanism was verified through simulation and experimental tests.The results show that changing the position of the magnet in the fixed ring increases the maximum value of axial force by 27.56%.Among all cases,the more blocks,the better balance of the suction mechanism.And the circumferential cut is better than the radial cut.The integral difference of the circumferential cut is reduced by 42.91%compared to the radial cut.The maximum error of the optimized suction foot mechanism after experimental verification is only 6.2%,which is in excellent agreement with the simulation results.It largely solves the problem of axial sealing in miniature scroll compressors.