Vacuum cleaner
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Solution Overview
Problem
Vacuum cleaners face challenges in achieving a compact size while maintaining suction performance and reducing noise, as the small distance between the impeller and diffuser leads to increased pressure loss and noise generation, and enlarging these components contradicts market trends for compact products.
Innovation Solution
The design includes a suction unit with an impeller and a diffuser where the diffuser features a plurality of vanes and guides that extend radially and are inclined, forming a longer air path without increasing the diameter, enhancing suction performance and reducing noise by ensuring sufficient air flow length and path resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the distance between the impeller and diffuser is reduced, then the suction force is improved, but noise is generated due to pressure perturbation
Solution Approach 1:
A plurality of vanes are disposed between the impeller and diffuser to act as an intermediary element. These vanes guide the air flow from the impeller into the diffuser, reducing pressure perturbation and noise while maintaining effective air flow path length for suction performance
Solution Approach 2:
The air flow path is extended in the radial direction by disposing vanes that protrude toward the outer casing. This allows the air flow length to be increased without increasing the axial distance between impeller and diffuser, maintaining suction force while reducing noise
2Power
If the size of the impeller and motor is increased, then the suction force is improved, but the size of the vacuum cleaner is increased
Solution Approach 1:
The air flow path length is extended by utilizing the radial dimension through vanes that protrude toward the outer casing. This allows sufficient air flow length for strong suction force without increasing the axial length or overall size of the vacuum cleaner
Solution Approach 2:
The vanes are disposed within the existing space between the impeller and diffuser, utilizing the available radial and axial space efficiently. This nested arrangement extends the air flow path without requiring additional external space
3Power
If the air flow path length is extended, then the suction force is improved, but the device size is increased
Solution Approach 1:
The air flow path is extended primarily in the radial direction through vanes that protrude toward the outer casing, rather than extending the axial length. This allows longer air flow path for better suction force without increasing the overall device size
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 enhances suction performance, maintains a compact size, and reduces noise by optimizing the air flow path and resistance within the vacuum cleaner.
Implementation Method 1
an impeller disposed to suck air by rotating about an axis
Implementation Method 2
a pressure loss of the air is increased
Implementation Method 3
noise may be generated due to pressure perturbation
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A vacuum cleaner having an improved structure capable of enhancing suction performance includes a suction unit provided in a main body, the suction unit including an impeller disposed to suck air by rotating about an axis thereof, and a diffuser disposed to guide air discharged from the impeller. The diffuser includes an inner casing, an outer casing disposed to be spaced apart from an outer circumference of the inner casing and to form a path through which the air discharged from the impeller flows, and a plurality of vanes disposed at the inner casing to guide the air discharged from the impeller to the path, and the plurality of vanes protrude toward the outer casing to cross at least a part of the path.