| 摘要: |
| 制冷空调系统采用多流路换热器时，要求制冷剂流量在各流路中均匀分配，其难以实现的主要原因之一是制冷剂流经折弯型分配器连接管时发生气液两相分离。本文提出将分配器连接管从一次折弯方式改为多次折弯方式的降低相分离程度的新思路，并用于连接管的结构优化设计。模拟研究了分配器连接管的折弯角度、折弯半径和管路直径对分流均匀性的影响；将这些结构参数进行合理组合，优化设计了具有多次折弯的分配器连接管结构；将该优化结构与原型结构进行分流不均匀度的对比。结果表明：分配器连接管的折弯角度是影响分流均匀性的最主要因素；与采用一次折弯的原设计相比，所设计的三次折弯型分配器连接管结构可降低分流不均匀度64.4%。 |
| 关键词: 分配器 连接管 分流均匀性 结构改进 |
| DOI： |
| 投稿时间：2021-06-21 修订日期：2021-09-06
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| 基金项目:国家自然科学基金（51906135）资助项目。 |
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| Structure Optimization of Connecting Tubes of Distributor for Improving the Distribution Uniformity of Refrigerant |
| Liu Lu,Liu Yantao,Zhan Feilong,Ding Guoliang,Gao Zheming,Xu Xuefei |
| (College of Mechanical and Power Engineering, Shanghai Jiao Tong University;GD Midea Refrigeration Equipment Co, Ltd) |
| Abstract: |
| Air conditioning systems commonly adopt multipath heat exchangers, which require distributors to guide the two-phase refrigerant to each flow path of heat exchangers uniformly. The gas-liquid two phase refrigerant may separate when it flows through the connecting tubes of distributors with bends, resulting in the deterioration of distribution uniformity. In this study, an optimization method was proposed for changing the traditional single-bending of tubes to the multi-bending of tubes to reduce the degree of separation of the gas-liquid two phase refrigerant. First, the influence of the bending structure factors of the connecting tubes on the distribution uniformity was investigated, including the bending angle, bending radius, and tube diameter. Second, the optimized structural parameters of the bending angle, bending radius, and tube diameter were combined to design an optimized connecting tube for the distributor. Finally, the distribution unevenness was compared between the optimized and original connecting tubes of the distributor. The results from the case studies in this study show that the bending angle is the main influencing factor, and the proposed optimization connecting tube of the distributor with three bends can reduce the distribution unevenness by 64.4% compared with the original one with a single bend. |
| Key words: distributor connecting tubes distribution uniformity structure optimization |
