In order to improve the operating efficiency of the hypersonic wind tunnel of the vacuum coating machine and meet the test requirements under the new situation, the vacuum guarantee system was modified. After the transformation, the operation and maintenance cost of the vacuum system is reduced, the operating environment is improved, and the efficiency of the wind tunnel test is significantly improved. This article introduces the transformation plan of the vacuum guarantee system and compares the performance before and after the system transformation.

       The vacuum system of the vacuum coating machine is an important power guarantee system for the hypersonic blowing and suction wind tunnel, and the guarantee capability of the vacuum system directly restricts the test capability of the hypersonic wind tunnel. The Φ1 m hypersonic wind tunnel, Φ0.3 m hypersonic low-density wind tunnel, and hypersonic arc wind tunnel of the China Aerodynamics Research and Development Center share a vacuum system. This vacuum system has been in operation for nearly 40 years and is gradually unable to meet the increasing demands. Improved wind tunnel test requirements. At present, the main suction equipment of the vacuum system of the vacuum coating machine is the H-600 slide valve vacuum pump. This vacuum pump is an oil-sealed mechanical pump. On the one hand, the unit is seriously aging, operating efficiency is low, and maintenance costs are too high. It reacts with arc ablation products, destroys the normal operation of the vacuum pump, and seriously pollutes the environment, restricting the completion of the test task. In order to meet the increasing demand for wind tunnel tests, improve the guarantee capability of the vacuum system, and ensure the health of the operators, it is considered necessary to upgrade the vacuum system.