Impeller Blade Geometry for High Suction Force in Compact Cleaners
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Solution Overview
Problem
Small stick-type cleaners face challenges in generating high suction force due to their small impeller size, requiring high-speed, lightweight motors that struggle to deliver sufficient torque and efficiency.
Innovation Solution
The design incorporates an impeller with a boss portion, a base portion, and blades featuring specific wind cutting and sending edges with optimized swept-back and inclination angles, combined with a mixed or centrifugal fan structure, to enhance suction force and efficiency, along with an upstream and downstream shroud and diffuser configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a small impeller is used in stick-type cleaners, then the cleaner becomes lightweight and easy to handle, but the suction force is insufficient
Solution Approach 1:
The patent optimizes the blade geometry parameters including the swept-back angle (15°-19°) and inclination angle (18°-26°) of the wind cutting edge, as well as the base portion diameter gradient, to maximize suction force generation within the constraints of small impeller size
Solution Approach 2:
The impeller employs curved blade surfaces with specific inclination angles and a base portion whose diameter increases gradually from intake to discharge side, creating optimized airflow paths that enhance suction force while maintaining compact dimensions
2Force
If a high-speed motor is used to generate sufficient suction force with a small impeller, then the motor delivers adequate torque, but the motor becomes complex and less reliable
Solution Approach 1:
The patent optimizes the impeller blade geometry parameters including the swept-back angle (15°-19°) and inclination angle (18°-26°) of the wind cutting edge, as well as the base portion diameter gradient, to maximize suction force generation within the constraints of small impeller size
Solution Approach 2:
The impeller employs curved blade surfaces with specific inclination angles and a base portion whose diameter increases gradually from intake to discharge side, creating optimized airflow paths that enhance suction force while maintaining compact dimensions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves suction efficiency and force, optimizing performance for high-speed operation and efficient air flow management, resulting in a more effective and efficient cleaner.
Implementation Method 1
an impeller that rotates by the rotation of the rotation shaft by the fan motor to generate a suction force for suctioning air into the main body from the dust case through an air passage
Data Source
AI summary
A cleaner including a body, a dust case, a shaft, a motor to rotate the shaft, and an impeller that rotates by the rotation of the rotation shaft by the motor to generate a suction force for suctioning air into the body from the dust case through an air passage, the impeller including: a boss portion fixed to the shaft, a base portion extended from the boss portion and having a diameter that increases from an intake side toward a discharge side of the air passage, and a plurality of blades on the base portion, each blade including: a wind cutting edge having a proximal end, and a protruding end, is behind the proximal end in a rotation direction of the impeller, and is closer to the intake side than the boss portion and a wind sending edge that is farther from the boss portion than the wind cutting edge.