In order to improve the operating efficiency of the hypersonic wind tunnel of the Pvd 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 wind tunnel tests is significantly improved. This paper introduces the transformation plan of the vacuum protection system, and compares the performance of the system before and after the transformation.

The vacuum system of the Pvd Coating Machine is an important power guarantee system for the hypersonic blow-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, the Φ0.3 m hypersonic low-density wind tunnel, and the hypersonic arc wind tunnel of the China Aerodynamic Research and Development Center share a set of vacuum systems. Increased wind tunnel testing requirements. At present, the main suction equipment of the vacuum system of the Pvd Coating Machine is H-600 sliding valve vacuum pump, which is an oil-sealed mechanical pump. On the one hand, the unit is seriously aging, with low operating efficiency and high maintenance costs. 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.