Vacuum Cleaner Fan Diffuser Vanes for Lower Flow Loss
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Solution Overview
Problem
Existing electric fans for vacuum cleaners face inefficiencies due to insufficient control over airflow, leading to turbulence and high flow losses, particularly in radial designs, and inadequate heat dissipation, which affects performance and longevity.
Innovation Solution
The design incorporates a diffuser with vanes spaced along the outer circumference of the impeller, featuring an outlet angle of 45° to 90°, and a refluxer with a specific diffusion degree, along with a refluxer flow passage that facilitates heat dissipation, enhancing aerodynamic performance and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a vaneless diffuser is used, then the radial size of the electric fan can be reduced, but the airflow control is insufficient causing turbulence and reduced aerodynamic performance
Solution Approach 1:
The patent applies parameter changes by introducing vanes with specific geometric parameters (outlet angle β between 45°-90°, diffusion degree Δ1 constraints) to transform the vaneless diffuser into a controlled flow passage structure. This changes the flow control parameters while maintaining the compact radial design, resolving the contradiction between small size and aerodynamic performance.
2Productivity
If a conventional vaned diffuser is used, then aerodynamic control is improved, but the tangential velocity is high causing large flow losses and low efficiency
Solution Approach 1:
The patent changes the vane outlet angle parameter β to be within 45°-90° (specifically optimized), which transforms the velocity triangle of the airflow. This parameter optimization reduces the tangential velocity component at the diffuser outlet while maintaining adequate aerodynamic control, thereby reducing flow losses and improving efficiency.
Solution Approach 2:
The patent applies local quality by designing vanes with varying outlet angles at different radial positions, and optimizing the diffusion degree Δ1 locally in different sections of the diffuser. This localized optimization allows better control of tangential velocity in high-loss regions while maintaining overall aerodynamic performance.
3Speed
If the diffusion degree of the diffuser is increased, then the flow velocity is reduced, but the cross-sectional area increases reducing compactness
Solution Approach 1:
The patent optimizes the diffusion degree parameter Δ1 within specific constraints, balancing the reduction of flow velocity against the increase in cross-sectional area. By carefully selecting Δ1 values and the vane outlet angle β, the patent achieves adequate velocity reduction without excessive diffuser expansion, maintaining compactness.
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 reduces tangential flow velocity, minimizes flow losses, improves efficiency, and extends the operational range of the electric fan while promoting heat dissipation, thereby enhancing the performance and lifespan of the vacuum cleaner.
Implementation Method 1
the flow velocity needs to be reduced by diffusing action of the diffuser
Implementation Method 2
The airflow velocity at outlet of an impeller of the electric fan is relatively high, and the flow velocity needs to be reduced by diffusing action of the diffuser, so as to reduce the flow losses
Implementation Method 3
the refluxer flow passage that facilitates heat dissipation
Data Source
AI summary
An electric fan and a vacuum cleaner having the same are provided. The electric fan includes: a cover having an open side; an impeller disposed in the cover; a diffuser including a diffuser body and a plurality of vanes, the diffuser body being located at a side of the impeller adjacent to the cover, the plurality of vanes being disposed at an end of the diffuser body adjacent to impeller and spaced apart from one another along an outer circumference of the impeller, an outlet angle of each vane being denoted as β, and β satisfying: 45°≤β≤90°; and a refluxer disposed at an end of the diffuser body away from the impeller. The electric fan reduces flow losses of airflow, and improves work efficiency.