Radial-Exhaust Centrifugal Blower With Integrated Diffuser Stiffness
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Solution Overview
Problem
Existing centrifugal air blowers face issues with low stiffness, durability, and reliability due to open case sides, leading to potential disconnection of cables and increased costs when ribs are added for stiffness, and require a radial exhaust port which complicates handling and noise reduction.
Innovation Solution
A centrifugal air blower design with a case body comprising a first and second case, where the second case has an upright diffuser and radial exhaust port, enhancing strength and handleability while maintaining air volume and static pressure, and reducing noise through arc-like diffusers and ridges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the case sides are opened to provide radial exhaust ports, then air volume and static pressure are improved, but stiffness and durability decrease
Solution Approach 1:
The case body is divided into multiple segments including a first case, second case, and diffuser sections. This segmentation allows the exhaust port to be provided on the radial-direction side surface while maintaining structural integrity through modular construction, resolving the contradiction between open-sided exhaust configuration and case stiffness.
Solution Approach 2:
The exhaust port is positioned on the radial-direction side surface rather than the axial-direction bottom surface, changing the dimensional orientation of the exhaust opening. This dimensional change allows adequate air volume and static pressure while maintaining case body strength through the reinforced side surface structure.
2Strength
If ribs are added to increase case stiffness, then strength is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The diffuser structure is merged with the case body, forming an integrated component that provides both structural support and airflow guidance functions. This merging eliminates the need for separate ribs to reinforce the case, maintaining stiffness while reducing manufacturing complexity and cost.
3Productivity
If the exhaust port is provided on the radial-direction side surface, then air volume is improved, but noise increases
Solution Approach 1:
The diffuser acts as an intermediary component between the centrifugal fan and the radial exhaust port. It gradually guides the airflow from the fan to the exhaust port, reducing turbulence and noise generation while maintaining adequate air volume and static pressure.
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 strength, reliability, and noise reduction with a compact, flat shape, allowing for increased air volume and static pressure, and reduced noise generation, suitable for vehicle applications.
Implementation Method 1
a centrifugal fan and a motor adapted to rotary drive the centrifugal fan. The centrifugal air blower draws in air from an axial-direction center part of the case body and discharges air from a radial-direction side surface of the case body
Implementation Method 2
The diffuser is formed upright at the bottom plate forming the second air blowing path and is coupled to an annular end part arranged at the radial-direction outer side. An exhaust port is provided to a radial-direction side surface of the second case while being partitioned by a diffuser.
Data Source
AI summary
There is provided a centrifugal air blower capable of maintaining strength of a case body and having high handleability and reliability even when an exhaust port is provided to a radial-direction side surface of the case body, and securing air volume and static pressure and reducing noise even in a small and flat shape. In an annular air blowing path 4f formed to circle around a case body 4 at a radial-direction outer side by a first case 4a and a second case 4b being assembled together, a radial-direction side surface of the second case 4b is provided with an exhaust port 4m partitioned by a diffuser 4n. The diffuser 4n is formed upright at a bottom plate 4q forming a second air blowing path 4e and is coupled to an annular end part 4r arranged at a radial-direction outer side.