Conical Inner Cage Air Filter for Uniform Activated Carbon Loading
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Solution Overview
Problem
Existing air filter cartridges often experience uneven air flow, leading to uneven loading of activated carbon and inefficient air purification, as the air flow rate varies across the filter surface.
Innovation Solution
A filter cartridge design featuring a perforated sheet metal outer basket and a conically shaped perforated inner basket, where the activated charcoal layer thickness decreases from the intake manifold to the base plate, ensuring a uniform air flow and even loading of activated carbon across the filter surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional air filter cartridge with uniform activated carbon layer is used, then the structure is simple and easy to manufacture, but the air flow is uneven leading to inefficient purification
Solution Approach 1:
The activated carbon layer thickness is varied locally within the filter cartridge - thicker at the edges and thinner at the center - to compensate for non-uniform air flow distribution. This local variation in layer quality ensures uniform purification efficiency across the entire filter surface while maintaining a relatively simple cylindrical structure.
Solution Approach 2:
The thickness parameter of the activated carbon layer is changed radially across the filter surface. By adjusting this physical parameter (thickness) according to position, the purification performance is optimized to achieve uniform air flow handling without requiring complex structural modifications to the filter housing.
2Ease of manufacture
If the activated carbon layer is made uniformly thick, then the manufacturing process is simple, but the air flow distribution becomes uneven
Solution Approach 1:
Instead of requiring precise control of layer thickness during manufacturing, the design specifies local quality variations where the activated carbon layer is intentionally made thicker at edges and thinner at center. This approach maintains manufacturing simplicity while achieving the precision goal of uniform air flow distribution through the varied thickness profile.
3Manufacturing precision
If a conical inner basket is used to create variable activated carbon layer thickness, then uniform air flow is achieved, but the assembly process becomes more complex
Solution Approach 1:
A conical (asymmetric) inner basket is used instead of a cylindrical (symmetric) one. This asymmetric geometry naturally creates the required variable thickness profile of the activated carbon layer, achieving uniform air flow distribution. The asymmetric shape is implemented as a simple conical form that is straightforward to manufacture and assemble.
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 achieves uniform air flow and even loading of activated carbon, optimizing the purification efficiency and allowing for quick assembly and refilling of the filter cartridge.
Implementation Method 1
an activated carbon layer, which is arranged in the space between the perforated inner basket and the perforated outer basket
Data Source
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AI summary
A filter cartridge (1) for cleaning air is described. The filter cartridge (1) comprises a perforated sheet metal outer basket (3) of cylindrical shape, the diameter of which is the same over the entire length of the filter cartridge (1), a bottom disk (2) which closes the filter cartridge (1) at the lower end, and a Intake connection (5), which closes the filter cartridge (1) at the upper end. The filter cartridge (1) comprises a conically shaped perforated inner basket (4), which extends inside the perforated outer basket (3) from the base plate (2) to the intake port (5) and through the base plate (2) and the intake port ( 5) is fixed. The perforated inner basket (4) tapers conically in the direction from the bottom disc (2) to the intake manifold (5), with the diameter of the perforated inner basket (4) steadily decreasing from the bottom disc (2) to the intake manifold (5). The filter cartridge (1) also includes an activated charcoal layer (6) which is arranged in the space between the perforated inner basket (4) and the perforated outer basket (3), the layer thickness of the activated charcoal layer (6) changing as a result of the cylindrical shape of the perforated outer basket (3) and the conical shape of the perforated inner basket (4) in the direction from the intake manifold (5) to the floor pane (2).