Centrifugal Blower Filter Layout for Lower Ventilation Resistance
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Solution Overview
Problem
Centrifugal blowers used in vehicle air conditioning systems face inefficiencies in air blowing due to uneven ventilation resistance across different regions of the filter, leading to reduced air blowing efficiency.
Innovation Solution
The centrifugal blower design incorporates a filter with a greater filtering face area in the third region compared to the first region, optimizing the pleat form and arrangement to reduce ventilation resistance and enhance air flow, while the rotary doors adjust air ratios to improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a filter is disposed in the air intake housing with uniform filtering face area across all regions, then the filter structure is simple and easy to manufacture, but the ventilation resistance becomes uneven across different regions, reducing air blowing efficiency
Solution Approach 1:
The filter is designed with different filtering face areas in different regions. Specifically, the first region opposing the first space has a different filtering face area than the second region opposing the second space, which in turn has a different area than the third region opposing the third space. This local differentiation optimizes ventilation resistance distribution across the filter, improving air blowing efficiency by matching the filtering capacity to the air flow demands of each region.
2Productivity
If the filtering face area of the third region is made greater than the first region, then ventilation resistance is reduced and air flow is enhanced in the third space, but the filter design becomes more complex
Solution Approach 1:
The filter is designed with different filtering face areas in different regions. Specifically, the first region opposing the first space has a different filtering face area than the second region opposing the second space, which in turn has a different area than the third region opposing the third space. This local differentiation optimizes ventilation resistance distribution across the filter, improving air blowing efficiency by matching the filtering capacity to the air flow demands of each region.
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 configuration improves air blowing efficiency by reducing ventilation resistance and increasing air flow through the filter, specifically by ensuring more air is drawn through the region with a larger filtering face area, thus enhancing overall performance.
Implementation Method 1
an impeller that has a multiple of blades forming a peripheral direction blade cascade, is driven by the motor in such a way as to rotate around an axis of rotation that extends in an axial direction, and discharges air in a space on a radial direction inner side of the blade cascade in a centrifugal direction
Implementation Method 2
a filter disposed in the internal space of the air intake housing in such a way that a filtering face intersects air flowing through the internal space
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A centrifugal blower (1, 101, 201, 301) includes an air intake housing (20, 120, 220, 320), including an internal space, a filter (40,140) disposed in the internal space, and first to third rotary doors (28a, 28b, 28c), wherein the first rotary door, the second rotary door, and the third rotary door are aligned in that order. The internal space includes first to third spaces (20A1-20A3) which are operating ranges of the rotary doors. The filter has first to third regions (51-53) that oppose the first to third spaces, and the first region coincides with a tongue portion (10T) of a scroll housing. A filtering face area of the third region (53) is greater than a filtering face area of the first region (51).