Diagonal Impeller Geometry for Fan Pressure and Noise Balance
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Solution Overview
Problem
Existing fans in light commercial or commercial cabinet air conditioners face challenges with low efficiency and high noise risks due to the use of forward multi-blade centrifugal impellers, while alternative types like backward centrifugal or axial fans improve efficiency but introduce pressure rise issues and higher noise at larger volumes or higher rotation speeds.
Innovation Solution
A diagonal impeller design with a base plate and top plate of unequal diameters, inclined surfaces, and non-equal blade diameters, along with specific inclination angles and trailing edge structures, to optimize airflow direction and reduce rotation speed, noise, and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If forward multi-blade centrifugal impeller is used, then pressure rise capability is improved, but efficiency deteriorates
Solution Approach 1:
The patent applies asymmetry by designing the impeller with unequal diameters for the top plate and base plate (D1 ≠ D2), creating a diagonal impeller structure. This asymmetric design optimizes the airflow path and pressure distribution, allowing the impeller to achieve both high pressure rise capability and high efficiency simultaneously, resolving the technical contradiction between these two parameters.
2Productivity
If backward centrifugal or axial fans are used, then efficiency is improved, but pressure rise capability deteriorates
Solution Approach 1:
The diagonal impeller with asymmetric top and base plate diameters creates optimized airflow characteristics that achieve both high efficiency and high pressure rise capability, overcoming the limitation of conventional symmetric impeller designs where improving one parameter compromises the other.
3Stress or pressure
If larger fan volume or higher rotation speed is used, then pressure rise capability is improved, but noise increases
Solution Approach 1:
The asymmetric diagonal impeller design optimizes the airflow path and pressure distribution, enabling the fan to achieve high pressure rise capability at lower rotation speeds. This reduces the noise generated by high-speed rotation while maintaining the required pressure performance.
4Stress or pressure
If forward multi-blade centrifugal impeller is used, then pressure rise capability is improved, but noise increases
Solution Approach 1:
The diagonal impeller with unequal top and base plate diameters creates more efficient airflow patterns that reduce turbulence and vortex formation. This asymmetric design allows the system to achieve the required pressure rise with lower rotation speeds, thereby reducing noise while maintaining pressure performance.
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 diagonal impeller design achieves improved efficiency and reduced noise by maximizing load and minimizing rotation speed, while maintaining pressure rise capability, resulting in enhanced static pressure efficiency and noise performance.
Implementation Method 1
a plurality of blades connected between the base plate and the top plate and arranged around an axis of the air inlet
Implementation Method 2
a surface of the base plate connected to the blades is an inclined surface, and an inclination angle γ of the inclined surface satisfies: 10° ≤ γ < 40°; a surface of the top plate connected to the blades is an inclined surface, and an inclination angle δ of the inclined surface satisfies: 10° ≤ δ < 50°
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided are a diagonal impeller, a fan and a ventilation device. The diagonal impeller comprises a bottom plate (10), a top plate (20) and a plurality of blades (30). The bottom plate (10) is configured to be connected to a driving motor (40); the top plate (20) is provided with an air inlet (21); the plurality of blades (30) are connected between the bottom plate (10) and the top plate (20) and are arranged around the axis of the air inlet (21), and air outlets (34) are formed between the bottom plate (10) and the top plate (20); the diameters of circles defined by the blades (30) are unequal in the axial direction of the air inlet (21), and the outer diameter of the bottom plate (10) is less than the outer diameter of the top plate (20).