Diagonal-Flow Fan Motor Diffuser for Lower Flow Path Loss
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Solution Overview
Problem
Conventional fan motors suffer from high flow path loss and poor flow path efficiency due to the use of centrifugal impellers and axial flow diffusers, which lead to inefficient air guidance and reduced overall motor efficiency, especially in downsized and high-speed applications.
Innovation Solution
The implementation of a diagonal flow impeller and diffuser design, including a vaneless section minimization and extended vane length, to reduce flow path loss and enhance efficiency, along with a manufacturing method that facilitates the assembly of a diffuser with a hub and vane structure using injection molding and secure fixation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a centrifugal impeller with hub line extending in diameter direction is used, then the结构简单 (structure is simple), but the flow path loss is heavy and flow path efficiency is poor
Solution Approach 1:
The patent changes the flow direction parameter from centrifugal (diameter direction) to diagonal flow, optimizing the flow angle to reduce flow path loss while maintaining structural simplicity
Solution Approach 2:
The patent introduces a diagonal flow component by extending the hub line at an angle rather than purely in the diameter direction, adding a dimensional aspect to the flow path that reduces energy loss
2Device complexity
If an axial flow diffuser with vanes provided in axial direction is used, then the structure is simple, but the flow path loss is heavy and flow path efficiency is poor
Solution Approach 1:
The patent changes the vane arrangement parameter from purely axial to diagonal flow orientation, optimizing the flow guidance angle to reduce flow path loss while maintaining structural simplicity
Solution Approach 2:
The patent introduces a diagonal flow component in the diffuser vanes, adding a dimensional aspect to the flow guidance that improves efficiency without significantly increasing complexity
3Device complexity
If the vaneless section between impeller and diffuser is long, then the structure is simple, but the flow path loss is heavy and flow path efficiency is poor
Solution Approach 1:
The patent applies preliminary flow guidance by extending the diagonal flow vane towards the impeller, preparing the flow path in advance to reduce loss in the vaneless section without significantly increasing structural complexity
4Device complexity
If the vane length of diffuser is short, then the structure is simple, but the flow cannot be guided effectively and flow path efficiency is poor
Solution Approach 1:
The patent optimizes the vane length parameter to an extended length, improving flow guidance effectiveness while maintaining a relatively simple structural form through the diagonal flow configuration
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 design significantly reduces flow path loss and improves flow path efficiency, increasing the suction capability and overall efficiency of the fan motor while simplifying the manufacturing process and assembly.
Implementation Method 1
the impeller is a diagonal flow type. Hence, in the impeller, a flow path loss may be reduced and flow path efficiency may be improved
Implementation Method 2
the diffuser includes a diagonal flow type. Hence, in the diffuser, a flow path loss may be minimized but flow path efficiency may be maximized
Data Source
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AI summary
Disclosed is a fan motor. The present disclosure provides a fan motor including a motor housing receiving a motor therein, a motor bracket disposed on the motor housing, an impeller coupled to a shaft of the motor, and a diffuser disposed between the motor and the impeller and having a vane body, an axial flow vane provided to an inner circumference of the vane body, and a diagonal flow vane provided above the axial flow vane.