Blower Vacuum Cutting Assembly With Start Interlock and Angled Blades
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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 safety mechanism to ensure the air inlet cover is closed before starting, a redesigned cutting assembly with angled blades, a dust-proof heat dissipation airflow path, enhanced collection bag design, and improved battery power and thrust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the air inlet cover is not closed before starting, then the blower/vacuum can be started, but the cutting assembly rotates without being shielded causing safety hazards
Solution Approach 1:
The patent implements a preliminary safety check mechanism where the control board detects whether the air inlet cover is closed before allowing the blower/vacuum to start. The startup circuit remains in a non-conducting state when the air inlet cover is open, preventing the motor from starting. This preliminary detection and prevention mechanism ensures that the cutting assembly is always shielded before operation, eliminating the safety hazard while maintaining ease of operation through automatic protection.
2Device complexity
If the cutting assembly uses traditional blade structure, then the structure is simple, but the cutting capability is insufficient causing incomplete cutting and blockage
Solution Approach 1:
The patent divides the cutting assembly into multiple independent blade components arranged in a specific pattern around the rotation axis. Instead of using a single traditional blade, multiple blades are segmented and positioned to work together, creating multiple cutting paths that improve cutting efficiency and prevent blockage. This segmentation allows the cutting assembly to handle various types of debris more effectively while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent employs asymmetric blade designs where blades have different lengths, angles, and positions relative to the rotation axis. This asymmetric configuration creates varied cutting trajectories and forces that improve the cutting capability for different types of debris. The asymmetric arrangement prevents material from getting stuck between blades and enhances overall cutting efficiency without significantly increasing structural complexity.
3Temperature
If the heat dissipation port is positioned near the electric motor, then the heat dissipation is effective, but dust is carried to the control board causing contamination
Solution Approach 1:
The patent extracts the heat dissipation function from the main airflow path that passes through the control board. By positioning the heat dissipation port and creating a separate heat dissipation airflow path, the harmful dust-laden airflow is separated from the control board area. The heat dissipation airflow is directed through a dedicated path that bypasses the control board, allowing effective cooling of the electric motor while preventing dust contamination of the control board.
Solution Approach 2:
The patent introduces an intermediary airflow path that acts as a mediator between the heat dissipation requirement and the dust protection requirement. The heat dissipation airflow serves as an intermediary stream that carries heat away from the motor without transporting dust to the control board. This intermediary airflow path effectively decouples the heat dissipation function from the dust-laden suction airflow, solving both problems simultaneously.
4Power
If the blower/vacuum has standard power output, then the device is compact, but it cannot handle heavier objects such as gravel
Solution Approach 1:
The patent optimizes multiple parameters of the blower/vacuum system including motor power, fan blade geometry, airflow path design, and thrust generation mechanisms. By changing these parameters within an optimized range, the system achieves higher blowing power capable of handling heavier objects like gravel. The parameter optimization is balanced with energy efficiency considerations, ensuring that the increased power output does not result in excessive energy consumption. The system achieves high power-to-energy-ratio through coordinated optimization of multiple design parameters.
Data Source
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AI summary
Provided is a blower/vacuum. The blower/vacuum includes a body housing, a control board, an air suction port, an air blowing port, and a first assembly structure. The control board has a startup circuit for controlling the blower/vacuum to start or shut down. The air suction port is capable of connecting an air inlet cover, where the air inlet cover has an open state and a closed state, and when the air inlet cover is in the closed state, an airflow is capable of entering the air suction port through the air inlet cover. The air blowing port is capable of connecting an air blowing tube, where the air blowing tube has a mounted position and an unmounted position, the startup circuit is in an non-conducting state and the blower/vacuum is in a shutdown state when the air blowing tube is in the unmounted position, and the startup circuit is in an conducting state and the blower/vacuum is in a ready-to-start state when the air blowing tube is in the mounted position. The air inlet cover can remain in the closed state and the air blowing tube is capable of being mounted to the mounted position when the first assembly structure is in an assembled state.