Segmented Guide Vanes for Ventilator Flow Stabilization
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Solution Overview
Problem
Free-running diagonal or centrifugal fans suffer from low pressure and efficiency due to high flow velocities, excessive noise, and structural obstructions that impede airflow, while maintaining a compact design is challenging.
Innovation Solution
The fan design incorporates a guide device with guide vanes that only extend over part of the flow area, stabilizing the inner flow and minimizing noise by reducing guide elements in the outer flow area, allowing for efficient energy conversion and compact tooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guide vanes extend over the entire flow area, then flow stabilization is improved, but noise increases and efficiency decreases
Solution Approach 1:
The guide vane device is segmented into two distinct zones: an inner flow area with guide vanes for flow stabilization and an outer flow area without guide vanes to reduce noise. This segmentation allows each zone to perform its specific function optimally without the negative effects of full-span guide vanes.
Solution Approach 2:
Different parts of the flow area are treated differently: the inner flow area receives guide vanes for stabilization where needed, while the outer flow area remains free of guide vanes to minimize noise generation. This local differentiation optimizes both flow control and noise reduction.
2Reliability
If guide vanes extend over the entire flow area, then flow guidance is improved, but static efficiency decreases
Solution Approach 1:
The guide vane device is segmented into two distinct zones: an inner flow area with guide vanes for flow stabilization, but an outer flow area without guide vanes. This segmentation allows each zone to perform its specific function optimally without the negative effects of full-span guide vanes.
Solution Approach 2:
Different parts of the flow area are treated differently: the inner flow area receives guide vanes for stabilization where needed, while the outer flow area remains free of guide vanes to minimize noise generation.
3Strength
If struts are used to connect motor fan to nozzle plate, then structural support is improved, but airflow obstruction increases
Solution Approach 1:
The harmful struts that obstructed airflow in the flow path have been completely removed from the design. Instead, the motor fan is supported through alternative means that do not intrude into the flow path, eliminating the airflow obstruction caused by structural support elements.
4Volume of moving object
If compact design is pursued, then space requirement is reduced, but manufacturing complexity increases
Solution Approach 1:
The guide vane device is segmented into two distinct zones: an inner flow area with guide vanes for flow stabilization, but an outer flow area without guide vanes. This segmentation allows each zone to perform its specific function optimally without the negative effects of full-span guide vanes.
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 enhances static efficiency, reduces noise, and lowers tool and parts costs, making it suitable for narrow installations while maintaining a compact form factor.
Implementation Method 1
the inner flow area 7, which, viewed in the span direction, is delimited towards the axis by the hub ring 4 of the guide device and towards the outer flow area 6 by the outer ring 5, is penetrated by guide elements 3, which stabilize the inner flow by reducing the swirl in the flow
Data Source
Figure 1~2
Figure 3~3a
Figure 4
AI summary
The invention relates to a ventilator, in particular an axial, radial or diagonal ventilator, having a ventilator impeller and a downstream guiding device connected downstream in the housing/flow channel, wherein the downstream guiding device comprises guiding vanes. The invention is characterized in that the guiding vanes extend only over one part of the flow region, when viewed spanwise and in the radial direction.