Multi-Stage Vehicle Vent Device Airflow Control

The vent device is divided into multiple independent layers (first layer with first vent holes, second layer with second vent holes, third layer with third vent holes). Each layer can be controlled independently to achieve precise airflow control in different directions, resolving the contradiction between control precision and structural complexity by segmenting the single-layer structure into multiple functional layers.

The patent employs a nested structure where the second layer is positioned within the first layer, and the third layer is positioned within the second layer. The inner layer elements are received by outer layer elements, creating a compact multi-layer configuration that achieves complex airflow control functionality while maintaining a space-efficient design.

The patent incorporates movable inner layer elements that can shift position relative to the outer layer elements. The inner layer elements are configured to move between different positions to selectively block or open vent holes, enabling dynamic adjustment of airflow patterns and directions without requiring multiple separate mechanical assemblies.

Each layer structure serves multiple functions: it provides structural support, defines airflow paths, controls ventilation openings, and guides airflow direction. The outer layer elements both protect the inner layer elements and serve as part of the airflow control mechanism themselves, reducing the need for separate dedicated components for each function.