Electric blower, electric vacuum cleaner, and hand drier
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Solution Overview
Problem
There is a demand for electric blowers of smaller size with higher efficiency, requiring improved blowing and cooling efficiency for motor units in electric blowers, as well as in electric vacuum cleaners and hand dryers.
Innovation Solution
The electric blower design includes a motor unit, a centrifugal impeller, a fan cover, a motor unit case with a vent, and a bracket with specific airflow passages that enhance airflow and cooling efficiency by creating distinct airflow passages with varying pressure losses, allowing for improved airflow impedance and cooling of the motor unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electric blower is reduced in size, then the compactness is improved, but the blowing efficiency and cooling efficiency deteriorate
Solution Approach 1:
The airflow passage is divided into multiple segments: inlet passage, intermediate passage with cooling holes, and outlet passage. This segmentation allows the air flow to be distributed and directed efficiently through different regions, maintaining high blowing efficiency in a compact design. The cooling holes further segment the airflow to provide targeted cooling to the motor unit.
Solution Approach 2:
The airflow passage utilizes three-dimensional spatial arrangement by extending in the axial direction and incorporating cooling holes that penetrate radially. This multi-dimensional configuration allows efficient airflow paths and cooling coverage within a reduced overall volume, resolving the contradiction between compactness and efficiency.
2Volume of moving object
If the electric blower is reduced in size, then the compactness is improved, but the cooling efficiency for motor unit deteriorates
Solution Approach 1:
Cooling holes are strategically positioned at specific locations on the airflow passage wall to target the motor unit cooling requirement. The local concentration of cooling function at these specific positions ensures effective heat dissipation from the motor unit while maintaining overall compact design.
Solution Approach 2:
The cooling function is segmented through multiple cooling holes distributed along the airflow passage, allowing heat to be removed at multiple points along the motor unit. This segmented cooling approach maintains high cooling efficiency in a compact configuration.
3Device complexity
If the airflow passage is simplified, then the device complexity is reduced, but the blowing efficiency deteriorates
Solution Approach 1:
The airflow passage integrates multiple functions into a single structure: air intake, air guidance, motor cooling (through cooling holes), and air discharge. This merging of functions reduces the number of separate components while maintaining efficient airflow characteristics for high blowing efficiency.
Solution Approach 2:
The airflow passage serves multiple purposes simultaneously: it conveys air from inlet to outlet, provides cooling to the motor unit through its cooling holes, and structures the airflow to optimize blowing efficiency. This multi-functionality reduces overall device complexity while maintaining performance.
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 design results in an electric blower with enhanced blowing and cooling efficiency, leading to higher performance and longer lifespan compared to conventional electric blowers, while also being applicable to electric vacuum cleaners and hand dryers.
Implementation Method 1
a centrifugal impeller (11) fastened to the shaft (5)
Implementation Method 2
an airflow passage extending from an inlet to an outlet and formed by the centrifugal impeller (11) and the fan cover (14)
Implementation Method 3
a first airflow passage and a second airflow passage that communicate with an airflow passage formed by the centrifugal impeller (11) and the fan cover (14)
Data Source
AI summary
An electric blower includes a motor unit, a shaft, a centrifugal impeller, a fan cover, a motor unit case, and a bracket located away from centrifugal impeller and toward motor unit in a direction in which a central axis of the shaft extends. The bracket includes a first portion located outward of the vent in a radial direction, and a second portion located outward of the first portion and outward of an outer circumference of the motor unit case in the radial direction. A first airflow passage and a second airflow passage are formed in the bracket, the first and second airflow passages communicate with an airflow passage formed by the centrifugal impeller and the fan cover.