During the operating of twin-screw refrigeration compressors, the leakage has a significant influence on the performance of compressors. In this paper, a novel minimum clearance technology that applies the abradable coating to the rotor surface is proposed to lessen the leakage. In order to adapt to the application of the abradable coating, the deformation of rotors during operation is analyzed and a suitable clearance is designed based on the fluid-solid coupling analysis. Then, a suitable coating pre-treated by sandblasting is obtained according to the results of friction coefficient and abradability test. Finally, a prototype is tested and the total efficiency, volumetric efficiency, refrigerating capacity, and COP of the prototype are compared before and after spraying the coating. Test results show that the volumetric efficiency and refrigerating capacity increase significantly after spraying the abradable coating, and the input power decreases slightly. As a result, the COP increases by 6.71% and 7.89% at two nominal operating conditions.

在双螺杆制冷压缩机运行期间，泄漏对压缩机的性能有重大影响。在本文中，提出了一种新颖的最小间隙技术，该技术可将耐磨涂层应用于转子表面，以减少泄漏。为了适应耐磨涂层的应用，分析了转子在运行过程中的变形，并基于流固耦合分析设计了合适的间隙。然后，根据摩擦系数和耐磨性测试的结果，获得通过喷砂预处理的合适的涂层。最后，测试了原型，并在喷涂涂层之前和之后比较了原型的总效率，容积效率，制冷量和COP。测试结果表明，喷涂耐磨涂层后，容积效率和制冷量显着提高，输入功率略有下降。结果，在两个标称工作条件下，COP分别增加了6.71％和7.89％。