Blower and household appliance
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Solution Overview
Problem
Existing blower designs in household appliances face issues such as noise due to poor assembly, complex assembly processes, and the inability to confirm impeller assembly angles during reassembly, as well as failure to achieve two-way anti-loosening, especially in range hoods with self-cleaning functions.
Innovation Solution
A blower design featuring a threaded connection between the motor shaft and a connecting disc, with opposing thread directions for the lock nut and motor shaft parts, ensuring secure assembly, reducing noise, simplifying assembly, and enabling fool-proof two-way anti-loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a clearance fit between motor shaft and impeller hole is used with pin positioning, then the assembly structure is simple, but noise is caused by poor assembly and the impeller assembly angle cannot be confirmed during reassembly
Solution Approach 1:
The patent replaces the traditional clearance fit mechanical connection with a threaded connection system. The motor shaft includes threads that engage with corresponding threads in the impeller hub, providing precise positioning and eliminating clearance-induced noise while maintaining assembly simplicity.
Solution Approach 2:
The patent introduces threaded parameters (thread pitch, thread direction) to the connection system. By changing from a clearance fit to a threaded engagement, the connection parameters provide precise control over impeller positioning and angle confirmation during reassembly.
2Manufacturing precision
If a pin press-fit positioning manner is used, then the impeller is positioned, but the assembly process becomes complex and the impeller assembly angle cannot be confirmed during reassembly
Solution Approach 1:
The patent replaces the pin press-fit system with a threaded connection system. The threads on the motor shaft engage with threads in the impeller hub, providing both positioning and angle confirmation capabilities while simplifying the assembly process to a single threaded fastening operation.
3Reliability
If a single-direction locking nut is used, then the impeller is secured in one rotation direction, but two-way anti-loosening is not achieved for forward and reverse rotation
Solution Approach 1:
The patent employs asymmetric thread designs on the motor shaft - different sections have different thread directions (one left-handed, one right-handed). This asymmetric configuration allows the impeller to be securely locked in both forward and reverse rotation directions while maintaining the ability to rotate bidirectionally for self-cleaning functions.
Data Source
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AI summary
A blower and a household appliance are disclosed. The blower includes an impeller assembly and a motor, where the impeller assembly includes an impeller and a connecting disc connected to the impeller, and the motor includes a motor shaft. The connecting disc is provided with a through hole, an internal thread in a first rotation direction is disposed on the through hole, the motor shaft has a first part and a second part, and the first part is provided with an external thread that is in the first rotation direction and that matches the internal thread of the through hole, to allow the connecting disc to be in threaded connection to the first part of the motor shaft. The second part extends to an end portion of the motor shaft, a lock nut is fixedly connected to the second part and is in axial contact with at least a part of the connecting disc, to limit an axial movement of the connecting disc out of the motor shaft. This solution can limit the thread position, to reduce the original risk of larger noise caused by poor assembly of a clearance fit between a shaft and a hole to a larger extent; and can also achieve fool-proofing.