| 摘要: |
| 扩压器是发动机中的重要组件，其常采用真空钎焊方式将零件焊接为组件，存在焊缝裂纹和脱焊问题。本研究以某径向扩压器为研究对象，首先分析了钎焊螺座脱落故障原因，然后提出了整体式径向扩压器改进设计，最后通过仿真和实验方法验证了整体式扩压器的强度、振动疲劳及整机性能。结果表明，螺座外圆和螺座内部的焊接缺陷在发动机工作过程中产生裂纹并扩展，最终导致螺座脱焊；整体式径向扩压器总质量为4.91 kg，较改进前零件质量减轻0.54 kg，并且减少了装配结构零件数量，简化了装配工序；整体式径向扩压器的结构强度有较大提升，不会产生共振疲劳破坏，整机性能与改进前基本相当。本研究提出的整体式径向扩压器结构合理，为高可靠性扩压器设计提供了新思路。 |
| 关键词: 径向扩压器 故障诊断 焊接 强度分析 动应力测试 |
| 基金项目: |
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| Failure Analysis and Improvement Design of Radial Diffuser Screw Seat Detachment |
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Guan Tingting Chen Shaojun Shang Huaiyuan Yang Fan
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AECC Changzhou Lanxiang Machinery Co., Ltd., Changzhou 213022
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| Abstract: |
| The diffuser is an important component in the engine, which often uses vacuum brazing to weld the parts into assemblies, with problems of weld cracks and desoldering. In this study, a radial diffuser is used as a research object to analyze the causes of brazed screw seat dislodgement failure. Then an improved design of integral radial diffuser is proposed. Finally, the strength, vibration fatigue and overall machine performance of the monolithic diffuser are verified by simulation and experimental methods. The results show that weld defects on the outer circumference of the screw seat and the inside of the screw seat crack and expand during engine operation, ultimately leading to screw seat de-welding. The total mass of the integral radial diffuser is 4.91 kg, which is 0.54 kg less than the mass of the parts before the improvement, and it reduces the number of assembled structural parts and simplifies the assembly process. Integral radial diffuser structural strength has been greatly improved, will not resonate fatigue damage, the performance of the whole machine is basically comparable to the improvement of the former. The integral radial diffuser proposed in this study is structurally sound and provides a new idea for the design of highly reliable diffusers. |
| Key words: radial diffuser troubleshooting welding strength analysis dynamic stress test |
