Working Machine Fan Angle Mechanism for Airflow Reversal
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Solution Overview
Problem
Existing working machines with fan systems face complications due to complex hydraulic circuits for reversing fan airflow direction and potential damage to rotary blades from stress concentration.
Innovation Solution
A fan system with an angle change mechanism that adjusts rotary blade angles using a movable body and conversion mechanism, incorporating inserts and fastenings to turn blades about a radial axis, reducing complexity and stress on the blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydraulic circuit is provided to control the switching of the switching valve that switches the rotation direction of the hydraulic motor, then the rotation direction of the fan can be switched between normal and reverse, but the device structure becomes complicated
Solution Approach 1:
The patent extracts and eliminates the complex hydraulic circuit and switching valve system from the fan drive mechanism. Instead of using a hydraulic motor with direction control, the invention uses a direct-drive configuration where the fan rotates in a fixed direction and airflow direction is changed by adjusting blade angles through a simplified angle change mechanism, thereby removing the need for complex hydraulic circuits while maintaining the ability to switch airflow direction.
Solution Approach 2:
The patent replaces the hydraulic control system with a mechanical angle change mechanism. Instead of using hydraulic motors and valves to control fan rotation direction, the invention uses a mechanical linkage that adjusts the attachment angles of the fan blades directly, substituting the complex hydraulic system with a simpler mechanical blade angle adjustment system.
2Adaptability or versatility
If gears are provided at the proximal ends of the rotary blades and the attachment angles of the rotary blades are changed by rotating the gears, then the airflow direction can be changed, but the proximal ends of the rotary blades are likely to be damaged due to stress concentration
Solution Approach 1:
The patent introduces an intermediary component (the angle change mechanism with adjustment linkage) that mediates between the control system and the rotary blades. Instead of directly rotating gears attached to the blade proximal ends which causes stress concentration, the intermediary mechanism adjusts blade angles through a distributed mechanical linkage system that avoids concentrating stress at the blade roots, thereby maintaining reliability while enabling airflow direction changing.
Data Source
AI summary
A working machine includes a fan to generate first and second airflows in different directions. The fan includes a central shaft, rotary blades each extending in a radial direction of the central shaft, and an angle change mechanism to change an angle of each rotary blade relative to the central shaft by turning the rotary blade about an axis in the radial direction. The angle change mechanism includes a movable body that is movable in an axial direction of the central shaft, and a conversion mechanism to convert movement of the movable body into turning movement of the rotary blades. The conversion mechanism includes inserts each inserted in the corresponding rotary blade in the corresponding radial direction, fastenings to fix the corresponding rotary blade and the corresponding insert together, and a turning mechanism to turn each insert about the corresponding axis as the movable body moves.