Diagonal Fan External Rotor Motor Integrated Impeller Design
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Solution Overview
Problem
Diagonal fans face challenges in achieving high power density and low noise levels due to large motor diameters, resulting in high outlet losses and noise generation, particularly in applications with limited installation space and high back pressure.
Innovation Solution
A compact diagonal fan design incorporating an external rotor motor with an integrated impeller and air-guiding blades, where the impeller is designed as a single piece or mounted on the rotor, and air-guiding vanes are strategically positioned to minimize axial installation space and optimize airflow, featuring a radial air gap and varying distances to enhance performance and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor diameter is increased to provide sufficient power, then the power output is improved, but the installation space requirement increases and the exhaust surface area decreases
Solution Approach 1:
The patent transitions from a traditional axial fan configuration to a diagonal fan design, changing the spatial dimension of airflow from axial to diagonal direction. This dimensional change allows the motor to be positioned more efficiently within the housing, reducing the radial installation space while maintaining power output. The diagonal airflow path enables better space utilization without compromising the motor's power-generating capability.
Solution Approach 2:
The patent integrates the impeller directly into the rotor structure, with impeller blades mounted on the rotor or formed as a single piece. This nesting principle eliminates the need for a separate impeller component, reducing the overall motor diameter and installation space requirement while maintaining the necessary power output through optimized rotor-impeller integration.
2Power
If the motor diameter is increased to provide sufficient power, then the power output is improved, but the exhaust surface area at the outlet opening decreases
Solution Approach 1:
By changing the airflow direction from axial to diagonal, the patent enables the outlet opening to be positioned and oriented more favorably. This dimensional change allows for a larger effective exhaust surface area at the outlet while the motor maintains its power-generating diameter, as the diagonal flow path optimizes the relationship between motor size and outlet area.
3Volume of moving object
If the axial flow channel length is reduced to make the fan more compact, then the installation space is reduced, but the airflow efficiency may deteriorate
Solution Approach 1:
The patent changes the airflow path from a purely axial direction to a diagonal direction. This dimensional change allows the air to be conveyed through a shorter axial distance while still achieving effective airflow movement. The diagonal flow path optimizes the relationship between axial channel length and airflow efficiency, enabling compact design without sacrificing productivity.
4Device complexity
If the number of parts is reduced to simplify the structure, then the device complexity is reduced, but the manufacturing precision requirements may increase
Solution Approach 1:
The patent combines the impeller and rotor into a single integrated structure, either as a one-piece design or with impeller blades directly mounted on the rotor. This merging principle reduces the total number of parts and simplifies the overall structure. While integration precision requirements increase, the patent addresses this through optimized design of the rotor-impeller connection, ensuring reliable assembly with appropriate tolerances.
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 design achieves improved airflow efficiency and reduced noise while maintaining a compact footprint, addressing the limitations of traditional diagonal fans by minimizing parts and installation space, thereby enhancing power density and noise characteristics.
Implementation Method 1
an external rotor motor with a stator (11) and a rotor (9) at least partially enclosing the stator (11)
Implementation Method 2
air sucked in via the impeller being sucked in through the flow channel during operation of the diagonal fan and being conveyable to the outlet opening
Implementation Method 3
an air-guiding device with a plurality of air-guiding blades (10) distributed in the circumferential direction
Data Source
Figure 1~2
Figure 3~4
AI summary
A diagonal fan having a fan housing within which an external-rotor motor and an impeller are accommodated, wherein the external-rotor motor has a stator (11) and a rotor (9) which at least partially surrounds the stator, and an axial flow duct runs between the fan housing and the external-rotor motor as far as a discharge opening, surrounding the external-rotor motor, of the diagonal fan, through which axial flow duct, during operation, air that is drawn in by means of the impeller can be conveyed to the discharge opening, and wherein the impeller is integrated into the rotor.