| 摘要: |
| 本文通过有限元软件COMSOL计算出了超声高频振动在结霜部位激发的剪切应力值，并与霜的最大黏附应力进行对比，从理论上说明超声高频振动除霜技术的可行性。并实验分析比较了在冷库温度-20 ℃，湿度95%的工况下，设定超声波频率38.76 kHz，加载机制每间隔50 s振动10 s，对比直板型、T型、L型三种传振结构对速冻冷风机除霜的效果。结果表明：速冻冷风机在高湿、低温工况下运行，超声波对其翅片表面结霜具有显著的抑制作用，可维持其长时间的连续工作，设备使用效率明显提高，直板型传振结构的除霜效果优于T型及L型。 |
| 关键词: 超声波 除霜 速冻冷风机 |
| DOI： |
| 投稿时间：2017-11-22
|
| 基金项目:国家自然科学基金（51575422）。 |
|
| Theoretical and Experimental Study on the Ultrasonic Defrosting Technology of a Quick-freezing Cooling Fan |
| Zuo Jiandong,Tao Tangfei,Jing Jiliang,Liu Xiaojiang,Xu Guanghua,Yang Yifan |
| (Dalian Rrfrigeration Co., Ltd.;Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University;Cooling and Heating Technology Innovation Center of Dalian;State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University) |
| Abstract: |
| The values of excitation shear stress for frosting cream from ultrasonic high-frequency vibration were calculated using the finite element software COMSOL, and compared with the maximum adhesion stress obtained theoretically to demonstrate the feasibility of ultrasonic high-frequency vibration defrosting technology. Meanwhile, the defrosting effects of three kinds of the vibration structure, i.e., monoblock type, T-shaped and L-shaped, of a quick-freezing cooling fan were experimentally compared and analyzed under the conditions that cold storage temperature was 20 ℃, humidity was 95%, the ultrasonic frequency was 38.76 kHz, and the loading mechanism was vibrating 10 s for every 50 s. The results show that the ultrasonic has a significant inhibitory effect on the frost on the fin surface under the working condition of high humidity and low temperature, so that the quick-freezing cooling fan can operate for a long time continuously and its efficiency is significantly improved. In addition, the vibration with the structure of the monoblock type has better defrosting effect than that with T- and L-shaped. |
| Key words: ultrasonic defrost quick-freezing cooling fan |
