Mechanical Fan Speed Control via Movable Pulleys

The patent replaces complex electronic control systems with a purely mechanical adjustment mechanism. The variable speed drive uses a belt transmission system with movable pulleys that can be mechanically repositioned along the shaft to change the transmission ratio, thereby controlling fan speed without electronic components.

The patent employs dynamic pulley positions that can be adjusted during operation. The movable pulleys allow the transmission system to adapt its geometry, changing the effective radius ratio between drive and driven pulleys to achieve variable speed control mechanically.

The patent uses simple, inexpensive mechanical components such as standard belt, pulleys, and springs instead of expensive electronic control systems. These mechanical parts are easier to manufacture and replace, reducing both initial production cost and maintenance expenses.

By substituting electronic control mechanisms with mechanical adjustment systems, the patent eliminates the need for expensive electronics, sensors, and control units, thereby significantly reducing production costs while maintaining functional effectiveness.

The patent uses a straightforward mechanical belt-driven system with movable pulleys to achieve variable fan speeds for noise reduction and heating modes, avoiding complex electronic control while providing sufficient speed variation capability.

The pulley system is divided into movable and fixed components, allowing independent adjustment of the belt position to achieve different speed ratios. This segmentation enables simple mechanical control of fan speed for different operational requirements.