Angled Cutting Assembly for Blower/Vacuum Chopping Safety
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Solution Overview
Problem
Existing blowers/vacuums face safety hazards due to erroneous operation causing the cutting assembly to rotate without a shield, inefficient cutting capabilities, dust contamination of the control board, difficulty in handling heavy objects, and cumbersome collection bag attachment.
Innovation Solution
Implementing a system with an air inlet cover and air blowing tube locking mechanism, a redesigned cutting assembly with angled blades, a dust-free heat dissipation path, and a large collection port with easy bag attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the air blowing tube is mounted without proper locking mechanism, then the blower/vacuum can be operated quickly, but safety hazards occur due to cutting assembly rotation without shield
Solution Approach 1:
The air inlet cover is pre-configured with locking structures (engaging protrusions and hooks) that automatically lock the air blowing tube in place when the cover is closed. This preliminary preparation of locking mechanisms ensures that proper shielding and securing of the cutting assembly is achieved before operation begins, preventing safety hazards while maintaining quick operation.
Solution Approach 2:
The locking mechanism creates a balanced state where the air blowing tube is securely held in position through symmetric engaging protrusions and hooks on the air inlet cover. This equipotential design ensures the tube remains firmly secured during operation without requiring additional active control, maintaining both safety and operational simplicity.
2Device complexity
If the cutting assembly uses traditional blade configuration, then the structure is simple, but cutting efficiency is insufficient leading to incomplete chopping
Solution Approach 1:
The cutting blades are designed with asymmetric geometry where one end of each blade extends further than the other, creating unequal cutting radii. This asymmetric configuration allows different portions of the blades to engage material at different stages of rotation, improving cutting efficiency and ensuring more complete chopping without significantly increasing structural complexity.
Solution Approach 2:
The cutting blades incorporate curved surfaces and rounded edges rather than purely straight geometric forms. This curvature allows the blades to more effectively engage and chop material through rolling and sweeping motions, enhancing cutting efficiency while maintaining a relatively simple overall blade structure that is easy to manufacture.
3Temperature
If the heat dissipation port is positioned near the electric motor, then heat dissipation is effective, but dust is carried to the control board causing contamination
Solution Approach 1:
The heat dissipation system is segmented into separate airflow paths: one path directs air through the electric motor for cooling, while another path handles dust-laden air from the air suction port. This segmentation prevents dust-carrying airflow from reaching the control board while maintaining effective heat dissipation through dedicated cooling channels.
Solution Approach 2:
The harmful dust-carrying airflow path is extracted and separated from the heat dissipation path. The control board is positioned and shielded such that it is not exposed to the dust-laden air stream, while the electric motor retains its effective heat dissipation through the separated airflow path, eliminating contamination while preserving cooling effectiveness.
4Reliability
If the collection bag is fixed through zipper or band, then the connection is secure, but mounting and detaching is time-consuming
Solution Approach 1:
The collection bag connection system uses a dynamic quick-release mechanism with engaging protrusions and corresponding recesses that can be rapidly engaged and disengaged. This dynamic design allows the bag to be securely attached during operation while enabling quick detachment when needed, significantly reducing the time required for bag changes while maintaining connection security through the interlocking geometry.
Data Source
AI summary
A cutting assembly applicable to a blower/vacuum, including a base rotatable about a rotation axis and a first blade connected to the base. The first blade includes a first cutting portion and a second cutting portion, the first cutting portion extends substantially along a first straight line, the second cutting portion extends substantially along a second straight line, the first cutting portion is connected to the base and is located between the base and the second cutting portion, and the first straight line does not coincide with the second straight line; and a length of the first cutting portion along a direction of the first straight line is a first length L1, a length of the second cutting portion along a direction of the second straight line is a second length L2, and the first length L1 is greater than the second length L2.