Vacuum Cleaner Diffuser Vanes for Compact Low-Noise Suction
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Solution Overview
Problem
Conventional vacuum cleaners face challenges in achieving a compact size while maintaining suction performance and reducing noise, particularly in small-sized models like hand-held cleaners, due to the limited distance between the impeller and diffuser which increases pressure loss and noise.
Innovation Solution
The design incorporates a suction unit with an impeller and a diffuser featuring a unique arrangement of vanes and guides that extend radially and are inclined, forming a longer air path to enhance suction efficiency and reduce noise, while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the distance between the impeller and diffuser is reduced to maintain compact size, then the suction force is improved, but noise increases due to pressure perturbation
Solution Approach 1:
The diffuser is divided into multiple sections with different vane configurations. The first diffuser section has vanes that guide air smoothly, while the second diffuser section has vanes at different angles to manage pressure gradients. This segmentation allows the system to maintain compact dimensions while controlling pressure perturbation and reducing noise through staged air flow management.
Solution Approach 2:
Different sections of the diffuser have locally optimized vane angles and configurations. The vanes in the first section are positioned to handle high-velocity air from the impeller, while vanes in the second section are angled to gradually reduce pressure. This local optimization enables effective noise control in specific regions without compromising overall compactness.
2Volume of moving object
If the distance between the impeller and diffuser is reduced to maintain compact size, then the overall dimensions are improved, but pressure loss increases
Solution Approach 1:
The diffuser path is segmented into multiple sections with progressively changing vane angles. This segmentation creates a staged pressure recovery process that efficiently manages air flow over a short distance, minimizing pressure loss while maintaining compact overall dimensions of the cleaner.
Solution Approach 2:
The air flow path is extended in the radial dimension by using multiple diffuser sections with increasing vane angles, rather than increasing the axial distance. This dimensional approach allows sufficient pressure recovery length to be achieved within a compact axial footprint, reducing pressure loss without increasing overall cleaner size.
3Object-generated harmful factors
If the distance between the impeller and diffuser is increased to reduce noise, then the suction force is reduced, but the cleaner size increases
Solution Approach 1:
The diffuser sections are nested concentrically around the impeller, with each diffuser section positioned at a different radial distance. This nested arrangement allows multiple air flow management stages to be packed into a compact space, enabling noise reduction through sufficient diffuser length without increasing the overall axial dimensions or compromising suction force.
4Productivity
If the number of diffuser sections is increased to improve air flow guidance, then the suction performance is improved, but the device complexity increases
Solution Approach 1:
Multiple diffuser sections are merged into a single integrated diffuser assembly that rotates with the impeller. The vanes of different sections are positioned at different radial distances and angles, but all function together as one cohesive unit. This merging approach improves air flow guidance and suction performance while avoiding the complexity of multiple separate adjustable components.
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 force, reduces noise, and enhances assemblability, allowing for a more efficient and quieter operation in compact vacuum cleaners without increasing their size.
Implementation Method 1
an impeller which rotates to generate suction force so as to draw air into the suction unit
Implementation Method 2
a diffuser disposed to guide air discharged from the impeller... a path provided between the inner casing and the outer casing so that the air discharged from the impeller flows therethrough
Data Source
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.