Φ5 mm超高齿高效内螺纹铜管的开发及性能研究

Development of Φ5 mm super high tooth high efficiency inner grooved copper tube

通过优化设计在线退火管坯力学性能、晶粒度大小以及旋压成形工艺,研究Φ5 mm超高齿高效内螺纹铜管生产工艺和单管换热性能。结果表明:Φ5 mm×0.2 mm+0.17 mm, 12°齿顶角,27°螺旋角,40条齿内螺纹铜管在线退火母管最佳抗拉强度为248 MPa,晶粒度为0.015 mm,且成形旋压采用Φ13.4938/4球工艺时,各项尺寸参数符合要求,形齿饱满。试制出的Φ5 mm超高齿高效内螺纹铜管较普通Φ5 mm内螺纹热交换性能有显著的提升,其冷凝热交换系数平均提高7.38%,且在制冷剂质量流速较大时,其压力损失仅增加2.26%。

The production process and single-tube heat transfer performance of Φ5 mm ultra-high-tooth high-efficiency inner grooved copper tube were studied by optimizing the design of online annealing tube blank mechanical properties,grain size and forming spinning process.The results showed that the optimal tensile strength of the online annealed parent tube for the forming of Φ5 mm×0.2 mm+0.17 mm inner-grooved copper tube with 12°groove angle,27°helix angle and 40 tooth was 248 MPa,and its grain size was 0.015 mm.When Φ13.4938/4 ball process was adopted for forming and spinning,the dimensional parameters meet the requirements and the shape teeth were full.The heat exchange performance of the Φ5 mm ultra-high tooth high-efficiency inner grooved copper tube was significantly improved compared with the ordinary Φ5 mm inner grooved copper tube,and its condensation heat exchange coefficient was increased by 7.38%on average,while the pressure loss only increased by 2.26%when the refrigerant mass flow rate was large.