Cleaner Impeller-Diffuser Structure for Suction and Noise Balance
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Solution Overview
Problem
Conventional cleaners face challenges in maintaining high suction efficiency while being compact and reducing noise, particularly in compact designs like handy and robot cleaners, due to increased pressure loss and noise from the proximity of the impeller and diffuser components.
Innovation Solution
The design incorporates an impeller with a hub and blades having a leading edge inclined 60-80 degrees to the axial direction, a diffuser with an airfoil-shaped vane, and a PMDC motor, optimizing the distances between the shaft and blade ends to enhance suction efficiency and reduce noise, allowing for a compact and cost-effective cleaner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between the impeller and diffuser is reduced to compensate for suction power loss, then the suction efficiency is improved, but noise increases due to pressure perturbation
Solution Approach 1:
The diffuser vane is designed with non-uniform thickness distribution, being thicker at the inlet side and thinner at the outlet side. This local variation in geometry creates a gradual pressure transition zone that reduces pressure perturbation and noise while maintaining the compact distance between impeller and diffuser for high suction efficiency.
Solution Approach 2:
The invention changes the geometric parameters of the diffuser vane, specifically the thickness ratio (t1/t2) between inlet and outlet sides, and the angle of the vane relative to the axial direction. These parameter optimizations allow the diffuser to effectively manage pressure transitions in a compact space, reducing noise without sacrificing suction performance.
2Object-generated harmful factors
If the size of the impeller and motor is increased to avoid noise, then the noise is reduced, but the size of the cleaner increases
Solution Approach 1:
The diffuser vane's non-uniform thickness design creates localized pressure management zones that reduce noise generation. This allows the use of a compact impeller-motor assembly without generating excessive noise, as the noise reduction is achieved through optimized flow management in the diffuser region rather than increasing component sizes.
Solution Approach 2:
The diffuser acts as an intermediary component between the impeller and the external environment. By optimizing the diffuser vane geometry, it mediates the pressure transitions and reduces noise generation, allowing compact impeller design while maintaining low noise levels.
3Power
If conventional high-power suction motors are used in compact cleaners, then the suction power is sufficient, but the pressure loss and flow loss increase significantly
Solution Approach 1:
The diffuser vane is designed with specific angular parameters (angle with respect to axial direction) and thickness ratios that optimize the pressure recovery process. These parameter changes enable efficient energy conversion from kinetic to pressure energy, reducing losses even in compact configurations with high-power motors.
Solution Approach 2:
The diffuser vane employs curved surfaces and gradual transitions rather than sharp angles or straight lines. This smooth curvature optimizes flow paths, reducing turbulence and energy losses while maintaining the compact space required for portable cleaner designs.
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 increases suction efficiency, reduces noise, and enables a compact cleaner design while lowering manufacturing costs by utilizing a semi-open impeller with a PMDC motor, improving overall performance and user experience.
Implementation Method 1
an impeller configured to suction air by rotating about a shaft
Implementation Method 2
a vane disposed between the inner casing and the outer casing to form a flow path in which air discharged from the impeller flows. The vane may have an airfoil shaped cross-section in the axial direction.
Data Source
AI summary
Disclosed herein is a cleaner having an improved structure configured to improve the cleaning performance. The cleaner comprises a suction unit provided inside a body. The suction unit includes an impeller configured to suction air by rotating about a shaft, and a diffuser configured to guide air discharged from the impeller. The impeller includes a hub, and a blade disposed on the hub, and provided with a leading edge disposed in an upstream side in a direction in which air introduced into the suction unit flows, and a trailing edge disposed in a downstream side in the direction in which the air introduced into the suction unit flows. The leading edge of the blade forms an inclination of 60 degrees or more and 80 degrees or less with respect to an axial direction.