Air Filter Assembly with Pre-Filter Segmentation
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Solution Overview
Problem
Existing air filter assemblies for internal combustion engines are inefficient in removing dirt, liquids, and impurities from air due to limitations in design and material properties, leading to reduced engine performance.
Innovation Solution
A filter assembly incorporating a housing with a filter element and a pre-filter element made from fleece material, which includes air-permeable layers that cover specific faces and portions of the filter element to enhance air filtration and prevent moisture from entering the housing, while maintaining air flow and pressure efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional filter assembly is used, then the structure is simple, but the filtration efficiency is insufficient and cannot effectively remove dirt, liquids, and impurities from air
Solution Approach 1:
The filter assembly is divided into distinct functional segments: a pre-filter element for capturing larger particles and a filter element for finer filtration. This segmentation allows each component to specialize in specific filtration tasks, improving overall filtration efficiency while maintaining manageable structural complexity
Solution Approach 2:
The patent employs composite material structures where the pre-filter element and filter element are constructed from different materials with complementary properties. The pre-filter uses materials effective for capturing larger particles while the filter element uses materials optimized for fine particle removal, creating a synergistic composite filtration system
2Reliability
If the filter element is exposed to moisture, then air flow is maintained, but moisture damages the filter element and reduces performance
Solution Approach 1:
The pre-filter element acts as an intermediary protective layer between the external environment (including moisture) and the filter element. It captures larger particles and prevents moisture from reaching the filter element, thereby protecting the filter element while maintaining air flow through the housing
Solution Approach 2:
The housing is designed with differentiated local qualities: the pre-filter element area provides enhanced protection against moisture and particles, while the filter element area maintains optimal air flow characteristics. This local differentiation allows the housing to simultaneously protect the filter element and maintain performance
3Productivity
If air flow is increased to improve engine performance, then power output increases, but more impurities enter the filter assembly reducing filtration effectiveness
Solution Approach 1:
The segmented filter assembly with pre-filter and filter element allows the system to handle higher air flow rates while maintaining filtration effectiveness. The pre-filter captures larger particles that would otherwise clog the finer filter element, enabling increased air flow without compromising the filter element's ability to remove fine impurities
Solution Approach 2:
The pre-filter element performs preliminary filtration of larger particles and moisture before air reaches the filter element. This preliminary action prepares the air for the filter element, allowing higher air flow rates to pass through while maintaining the filter element's filtration effectiveness by preventing it from being overloaded with particles
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 solution effectively removes dirt and impurities from air, improves the dirt-holding capacity of the filter, and prevents moisture from affecting the filter element, thereby enhancing the overall performance and reliability of the air filter assembly.
Implementation Method 1
a layer of air-permeable material that is attached to the filter element and that covers the upstream face and a portion of the first end face that is exposed to the inlet
Data Source
AI summary
A filter assembly may include a housing, a filter element, and a layer of air-permeable material. The housing may include an inlet and an outlet. The filter element may be disposed within the housing and may include an upstream face, a downstream face, a first end face facing the inlet and extending between the upstream and downstream faces. The layer of air-permeable material may be attached to the filter element and may cover the upstream face and a portion of the first end face that is exposed to the inlet.