Centrifugal Blower Anti-Leakage Element Design
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Solution Overview
Problem
Conventional centrifugal blowers suffer from lower operation efficiency due to air leakage through clearances between the casing and blades, resulting in reduced static pressure and intake rate.
Innovation Solution
Incorporation of a first anti-leakage element that extends from the inlet edge into the casing, partially covering the blades and gradually reducing its range as it approaches the outlet, effectively minimizing air leakage and maintaining intake efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional centrifugal blower operates without anti-leakage elements, then the structure is simple and easy to manufacture, but air leaks through the clearance between the top portion and blades, reducing operation efficiency
Solution Approach 1:
The patent introduces an anti-leakage element as an intermediary component between the top portion and the blades. This element extends from the inlet edge into the casing and partially covers the blades, serving as a mediator to block the clearance path without requiring complex modifications to the main blower structure. The anti-leakage element effectively reduces air leakage while maintaining relative structural simplicity.
Solution Approach 2:
The anti-leakage element is designed to extend in the rotational direction of the blades, creating a dimensional barrier that blocks the radial clearance leakage path. By extending the anti-leakage element from the inlet edge into the casing along the rotational direction, it creates a multi-dimensional obstruction to air leakage without complicating the basic axial-radial flow path.
2Productivity
If an anti-leakage element extends fully into the casing to prevent air leakage, then operation efficiency improves, but air intake rate may be significantly reduced
Solution Approach 1:
The anti-leakage element is designed with local quality by extending only partially into the casing rather than fully blocking the entire clearance. It starts from the inlet edge and extends a specific distance into the casing, providing leakage prevention exactly where the pressure differential is highest, while leaving the intake path sufficiently open to maintain air intake rate.
Solution Approach 2:
The patent applies partial action by having the anti-leakage element extend only to a certain degree into the casing rather than completely blocking the clearance. This partial extension is sufficient to prevent the majority of air leakage occurring in the high-pressure differential region, while avoiding excessive blocking that would reduce air intake rate.
3Productivity
If the anti-leakage element extends uniformly throughout the casing, then air leakage is minimized, but the intake rate is greatly decreased
Solution Approach 1:
The anti-leakage element design incorporates dynamic consideration by having its extension distance vary along the rotational direction. It extends further into the casing in regions where leakage is most problematic while tapering off in other regions, creating a dynamic balance between leakage prevention and maintaining adequate air intake flow paths.
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 anti-leakage element enhances operation efficiency by preventing air leakage and maintaining increased static pressure within the blower, while minimizing the impact on air intake rates.
Implementation Method 1
The first anti-leakage element extends from at least part of a first edge of the first inlet to an interior of the casing and partially covers parts of the blades
Implementation Method 2
A centrifugal blower blows an air flowing in a direction substantially perpendicular to a rotation axis of the centrifugal blower
Data Source
AI summary
A centrifugal blower includes a casing, a motor fixed in the casing, a fan structure, and an anti-leakage element. The casing has a top portion having an inlet, a bottom portion, and a side wall respectively connecting the top and bottom portions and having an outlet. The fan structure disposed in the casing and driven by the motor has a body connected to the motor and blades surrounding the body and being connected to the body, and rotates about an axis in a first rotation direction. The anti-leakage element extends from at least part of an edge of the inlet to an interior of the casing, partially covers parts of the blades, and extends from neighborhood of the outlet in a second rotation direction against the first rotation direction. A range of the anti-leakage element extending to the interior of the casing is gradually reduced along the second rotation direction.