Centrifugal Blower Guide Part Airflow Management
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Solution Overview
Problem
Centrifugal blowers experience inefficiencies and noise due to large intersection angles between backflow air and main flow, leading to insufficient reduction in flow rate and noise caused by backflow air.
Innovation Solution
A blower design featuring a fan with a cylindrical fan ring portion and an annular guide part that forms a suction port, allowing communication between an upstream space and a gap between the fan ring and guide part, which merges air flows to reduce the intersection angle and improve efficiency and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional centrifugal blower design is used with a bell mouth and shroud, then the structure is simple and easy to manufacture, but large intersection angles between backflow air and main flow occur, causing insufficient noise reduction and efficiency loss
Solution Approach 1:
The blower is divided into distinct functional components: a fan unit with blades, a separate guide part with guide blades, a bell mouth, and a shroud. This segmentation allows each component to be optimized independently for its specific function while maintaining overall structural simplicity and ease of manufacture.
Solution Approach 2:
The guide part acts as an intermediary component between the fan unit and the bell mouth. It mediates the air flow by guiding the main flow and backflow air separately, reducing their intersection angle without requiring complex modifications to the fan or bell mouth structures.
2Ease of manufacture
If a conventional centrifugal blower design is used with a bell mouth and shroud, then the structure is simple and easy to manufacture, but noise from backflow air intersection is not sufficiently reduced
Solution Approach 1:
The guide part serves as an intermediary that reduces noise by separating the paths of main flow and backflow air. The guide blades within the guide part redirect air flows to minimize their intersection, thereby reducing turbulence and noise generation without complicating the overall structure.
Solution Approach 2:
The guide part changes the flow direction parameters of both main flow and backflow air. By adjusting the angles and directions of these flows through properly positioned guide blades, the intersection angle is reduced, which directly decreases noise generation from turbulent mixing.
3Device complexity
If the fan ring portion is positioned closer to the guide part, then the gap between them is smaller and structural complexity is reduced, but air flow communication and efficiency are compromised
Solution Approach 1:
The communication path is extracted as a distinct functional feature formed outside the guide part in the radial direction. This allows air flow communication between the upstream space and the gap between the fan ring portion and guide part without requiring the components to be physically closer or more complexly arranged.
4Device complexity
If the intersection angle between backflow air and main flow is not reduced, then the structure remains simple, but the speed component of backflow air in the circumferential direction is high and efficiency is reduced
Solution Approach 1:
The guide part mediates the interaction between backflow air and main flow by providing separate guidance paths. The guide blades redirect the backflow air to reduce its circumferential speed component before it merges with the main flow, improving efficiency without requiring complex modifications to the fan or bell mouth.
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 reduces noise and improves fan efficiency by merging air flows, minimizing the speed component of backflow air in the circumferential direction and reducing air flow rate, thus enhancing the blower's performance.
Implementation Method 1
a fan that includes a plurality of blades arranged side by side in a circumferential direction around a fan axis... the fan rotating around the fan axis to blow out air sucked from one side in an axial direction of the fan axis with respect to the fan ring portion through an inside of the fan ring portion into between the blades
Implementation Method 2
A communication path that allows an upstream space located on the one side in the axial direction with respect to the guide part to communicate with a gap between the fan ring portion and the guide part is formed outside the guide part in a radial direction of the fan axis
Data Source
AI summary
A fan includes blades and a side plate. The side plate includes a fan ring portion having a cylindrical shape centered on a fan axis. A guide part that is annular is arranged on one side of the fan ring portion in the axial direction and forms a suction port through which the air sucked into the fan passes. A communication path that allows an upstream space located on the one side in the axial direction with respect to the guide part to communicate with a gap between the fan ring portion and the guide part is formed outside the guide part in a radial direction of the fan axis. The fan ring portion is located outside in the radial direction with respect to an innermost peripheral portion of the guide part located on an innermost side in the radial direction.