Ceiling Fan Shaft-Pipe Connection and Rocking Control
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Solution Overview
Problem
Conventional ceiling fans face issues with insufficient holding strength due to loose connections between the motor shaft and hanging pipe, leading to safety concerns, and unbalanced fan blades cause rocking motions that can result in accidents.
Innovation Solution
A ceiling fan design incorporating a displacement-correspondence tool and power source control tool to detect relative positional displacement between the shaft and pipe, controlling motor energization to prevent wear and stop operation during abnormal rocking motions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shaft and pipe are connected with a screw, then the connection is simple, but the holding strength is insufficient and the connection wears out over time
Solution Approach 1:
A connecting rod is introduced as an intermediary component between the shaft and pipe. The connecting rod has a first through-hole in the shaft and a second through-hole in the pipe, with a screw passing through both holes to secure the connection. This intermediary structure distributes the connection force and prevents direct wear between the shaft and pipe, thereby improving holding strength while maintaining ease of assembly.
2Productivity
If the ceiling fan operates with unbalanced fan blades, then the fan can rotate, but large rocking motions are generated causing abnormal wear and potential falling
Solution Approach 1:
A displacement-correspondence tool is installed to detect the relative positional displacement between the shaft and pipe caused by rocking motions. When displacement exceeds a predetermined threshold indicating abnormal operation, a power source control tool automatically cuts off power supply to the motor, stopping the fan operation. This feedback mechanism prevents further wear and ensures safety while allowing normal operation when balanced.
3Reliability
If a wire is fixed to prevent falling, then safety is improved, but the wire may be cut by excessive load over time
Solution Approach 1:
The connecting rod serves as a robust intermediary structure that replaces the vulnerable wire. The connecting rod with its through-holes and screw fastening provides a strong mechanical connection between the shaft and pipe, distributing loads effectively and preventing the type of excessive load concentration that would cause wire failure, thereby maintaining safety without compromising durability.
Data Source
AI summary
A ceiling fan includes a motor which rotates a plurality of blades, a shaft projecting from the motor, a pipe connected to an upper end of the shaft and which hangs from a ceiling surface, and a connecting rod for connecting the pipe and the shaft with each other via through holes formed in the pipe and the shaft, respectively. The ceiling fan also includes a displacement-correspondence tool which is displaced or which detects a displacement amount in correspondence with a relative positional displacement amount between the shaft and the pipe, and a power source control tool which controls energization to the motor in accordance with the displacement of the displacement-correspondence tool or the detected displacement amount.