Tray-Type Fan Impeller Noise Reduction via Boss Bodies
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Solution Overview
Problem
Conventional fan impellers experience airflow separation and noise issues due to non-uniform blade arrangements and uneven weights, leading to blade pass frequency noise, which affects airflow direction and creates wind shear sound.
Innovation Solution
A tray-type fan impeller structure featuring a plate body annularly disposed around a hub with upper and lower boss bodies arranged at intervals, allowing airflow to flow uniformly regardless of rotational direction, reducing noise by eliminating traditional blades and optimizing airflow pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional blades are used in fan impeller, then the fan can drive airflow, but periodical noise is generated due to non-uniform blade arrangement and uneven weights
Solution Approach 1:
The patent removes the traditional blade structure from the fan impeller and replaces it with a tray-type structure. This extraction of the harmful blade element eliminates the source of periodical noise while maintaining the airflow driving function through the tray structure's interaction with airflow
Solution Approach 2:
The patent creates a simplified version of the traditional blade function using the tray structure. The tray type impeller copies the essential airflow driving capability without replicating the complex blade geometry that causes noise, achieving functional equivalence with reduced harm
2Ease of manufacture
If blades are arranged non-uniformly or with uneven weights, then manufacturing flexibility is improved, but airflow separation effect and wind shear sound are caused
Solution Approach 1:
By removing the blade structure entirely and replacing it with a tray-type impeller, the patent eliminates the problems associated with non-uniform blade arrangement and uneven weights. The tray structure provides a more uniform airflow interaction pattern that reduces airflow separation and wind shear sound
Solution Approach 2:
The patent changes the fundamental geometric parameters of the impeller from traditional blade shapes to a tray-type structure. This parameter change transforms the airflow interaction mechanism, reducing harmful effects while maintaining manufacturing flexibility through the simplified tray structure
3Ease of operation
If traditional blade structure is used, then airflow direction control is achieved, but device complexity and noise generation increase
Solution Approach 1:
The patent extracts the essential airflow direction control function from the complex blade structure and implements it through a simpler tray-type impeller. This reduces device complexity while maintaining the ability to control airflow direction through the tray structure's design
Solution Approach 2:
Instead of using traditional blades that push air, the tray-type impeller works by creating a tray structure that guides and directs airflow in a reversed approach. This inversion of the traditional blade concept simplifies the structure while maintaining airflow control capability
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
The tray-type fan impeller structure effectively minimizes periodical noise and ensures airflow direction consistency, regardless of rotational direction, by using a plate body with strategically arranged upper and lower boss bodies to manage airflow, thus improving noise reduction and airflow efficiency.
Implementation Method 1
an airflow flowing from the wind inlet side through the upper boss bodies and the first gaps to flow out from the wind outlet side
Data Source
AI summary
A tray-type fan impeller structure includes a plate body annularly disposed around a hub. The plate body has a connection side connected with the hub and a free side extending in a direction away from the hub. Multiple boss bodies are arranged on a top face or the top face and a bottom face of the plate body at intervals. By means of the boss bodies, the periodical noise problem caused by the conventional blades is improved.