Axial Flow Fan Segmented Frame Design
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Solution Overview
Problem
Conventional axial flow fans are limited in design flexibility due to the maximum outer diameter of the impeller being restricted by the inner diameter of the housing, preventing optimal sizing and shaping of both components.
Innovation Solution
The axial flow fan design incorporates a fan frame composed of a first body with connecting elements and a hollow second body, allowing the minimum inner diameter of the flow passage to be equal to or smaller than the impeller's outer diameter, enabling flexible design and assembly/disassembly through specific combining portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the impeller is mounted in the housing via an opening of the housing, then the assembly is simple, but the maximum outer diameter of the impeller is restricted by the inner diameter of the opening
Solution Approach 1:
The fan frame is divided into a first body and a second body that can be assembled separately. The impeller is mounted on the base of the first body, and the second body is then assembled around the impeller. This segmentation allows the impeller's maximum outer diameter to exceed the inner diameter of the flow passage opening, resolving the dimensional restriction while maintaining assembly simplicity.
2Volume of stationary object
If the maximum outer diameter of the impeller is restricted by the inner diameter of the opening, then the housing size is reduced, but the shape of the impeller and housing cannot be designed flexibly
Solution Approach 1:
By segmenting the fan frame into two bodies that assemble around the impeller, the design enables the impeller to have a larger diameter than the flow passage opening would normally allow. This provides flexibility in shaping both the impeller and housing to meet practical demands while controlling overall size.
3Strength
If the fan frame is made as a single integrated structure, then the structural integrity is high, but the assembly and disassembly is difficult
Solution Approach 1:
The fan frame is segmented into a first body and a second body connected through connecting elements. This allows the frame to be assembled and disassembled by connecting and disconnecting these elements, maintaining structural integrity while enabling easy assembly and disassembly for maintenance or replacement.
Solution Approach 2:
The connecting elements allow the fan frame to transition between assembled and disassembled states. The dynamic connection mechanism enables easy assembly and disassembly while maintaining structural integrity when assembled, resolving the contradiction between strength and ease of manufacture.
Data Source
AI summary
An axial flow fan is provided. The axial flow fan includes an impeller and a fan frame. The impeller has a maximum outer diameter. The fan frame includes a first body and a second body. The first body includes a plurality of connecting elements and a base. The connecting elements are connected to the base. The second body is a hollow body, and used for disposing around the impeller. The second body includes a flow passage having a minimum inner diameter. The minimum inner diameter of the flow passage is not larger than the maximum outer diameter of the impeller. Therefore, the size of the second body does not restrict the maximum outer diameter of the impeller, and the shape of the impeller and the shape of the fan frame can be designed flexibly according to the practical demand.