Its beautiful appearance, reliable performance, small volume, low power consumption, small vibration, low noise, simple operation, maintenance free, and exhaust gas cleaning and drying, the use will not cause any pollution to the surrounding environment. It can be widely applied in laboratory equipment, medical equipment, medical and health, teaching and scientific research, precision instruments, biological, electronic, print, steel, shipbuilding, electric power, textile, tobacco, machinery, spraying, chemical, petrochemical, food processing and other fields.