Air Guide Ring Resonance Structure for Axial Fan Noise Reduction

The patent introduces noise reduction devices as intermediary structures positioned between the air guide ring and the impeller. These devices include resonant cavities and absorbing materials that intercept and dissipate the air flow disturbances generated at the gap, converting the harmful noise into harmless energy dissipation without restricting impeller rotation.

The patent converts the harmful air flow disturbances and noise generated at the gap into beneficial effects by using resonant cavities that absorb sound energy and converting materials that dissipate vibration energy. The harmful vibrations are transformed into thermal energy through friction in the absorbing materials, effectively eliminating noise while maintaining the necessary gap for impeller rotation.

The patent embeds the noise reduction devices within the existing air guide ring structure. The resonant cavities are integrated into the air guide ring walls, and the absorbing materials are placed within recesses or channels of the air guide ring. This nesting approach allows noise reduction functionality to be added without significantly increasing overall device complexity or altering the external dimensions of the air guide ring.

The patent applies noise reduction measures locally rather than uniformly throughout the entire air guide ring. The resonant cavities and absorbing materials are positioned specifically at locations where air flow disturbances and noise are most prominent, such as near the impeller blades and at the gap interfaces. This localized approach reduces noise effectively while minimizing the addition of complexity to the overall structure.