Centrifugal Impeller Backflow Management
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Solution Overview
Problem
Conventional centrifugal air blowers face efficiency degradation due to flow collisions and turbulence noise, and have complex structures that increase production costs and hinder size reduction.
Innovation Solution
A centrifugal impeller with a disc-shaped main plate, circumferentially disposed blades, a ring-shaped plate, and a concentric cylindrical wall, which reduces backflow and turbulence, enhancing air-blow efficiency and noise reduction while allowing for a compact, cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ventilation holes are disposed in main plate to form circulation flow and prevent backflow stagnation, then air-blow efficiency is maintained, but flow collision between flow from blade periphery and backflow occurs causing turbulence noise and efficiency degradation
Solution Approach 1:
The invention extracts the harmful backflow from the main flow path by providing a dedicated backflow collection space separated from the blade outlet area. The backflow is collected in a specific region and guided through designated paths, preventing it from colliding with the primary airflow from the blades, thus eliminating turbulence noise while maintaining ventilation efficiency.
Solution Approach 2:
The invention introduces an intermediary structure (the backflow collection space and guiding walls) that mediates between the backflow and the main flow. This intermediary region acts as a buffer zone that captures and directs backflow away from the blade outlet, preventing direct collision and reducing turbulence in the main airflow path.
2Device complexity
If conventional centrifugal impeller structure with draw part is used, then motor mounting is enabled, but structure complexity increases and size reduction is hindered
Solution Approach 1:
The invention merges the draw part structure with the main impeller body, eliminating the need for a separate draw part component. The motor mounting structure is integrated directly into the impeller design, reducing the overall number of parts and simplifying the structure while enabling compact motor mounting and size reduction.
Solution Approach 2:
The impeller structure is designed to serve multiple functions: it acts as both the rotating element for air movement and as the mounting structure for the motor. The integrated design allows the impeller to fulfill both aerodynamic and structural support roles, reducing overall device complexity and enabling size reduction.
3Temperature
If backflow is allowed to circulate through ventilation holes, then motor cooling is achieved, but flow collision with peripheral flow occurs degrading blade function
Solution Approach 1:
The invention segments the flow paths into distinct regions: one for the main airflow from the blades and another for the backflow circulation. By providing separate channels and spaces for different flow types, the design allows motor cooling through backflow circulation while preventing interference with the primary air-moving function of the blades.
Solution Approach 2:
The invention introduces intermediary flow guidance structures that mediate between the cooling requirement and the air-moving function. These structures guide backflow through specific paths that provide motor cooling while preventing the backflow from interfering with the peripheral flow from the blades, thus maintaining blade efficiency.
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 solution improves air-blow efficiency and reduces noise, enabling a compact, cost-effective centrifugal air blower suitable for ventilating fans and air-conditioning devices with reduced production complexity and size.
Implementation Method 1
a driving force fed from motor 113 to rotary shaft 114 rotates centrifugal impeller 112. The rotation of centrifugal impeller 112 allows intake air 115 to pass through air inlet 102 and flow into blades 111, increasing pressure.
Data Source
AI summary
Centrifugal impeller (14) of centrifugal air blower (1) has main plate (15); a plurality of blades (18); ring-shaped plate (20); and a cylindrical wall (22). The blades (18) are circumferentially disposed on the side of the outer periphery of front side (17) of main plate (15). Ring-shaped plate (20) is attached to tip sections (19) of blades (18). Cylindrical wall (22) is disposed on the back side (21) of the main plate (15) so as to be concentric therewith. The structure above provides centrifugal impeller (14) and centrifugal air blower (1) with improved air-blow efficiency and noise-reduced operations.