Air Filter Assembly Inset Collar Turbulence Reduction
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Solution Overview
Problem
Existing air filter assemblies for engine intake systems face challenges in accurately measuring airflow due to excessive turbulence caused by other components, which affects the accuracy of mass flow rate measurement.
Innovation Solution
The air filter assembly incorporates a secondary filter element with an inset collar that minimizes airflow dispersion and maximizes flow stability by directing air flow into the outlet tube without passing over the sealing structure of the secondary filter element, thereby reducing turbulence and enhancing the accuracy of airflow measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If an air metering device is included within the air filter arrangement, then airflow measurement capability is improved, but measurement precision deteriorates due to excessive turbulence caused by other components
Solution Approach 1:
The air filter assembly is divided into distinct functional zones: a first region containing the air metering device and a second region containing the filter element. This spatial segmentation isolates the measurement function from the filtration function, preventing turbulence generated by the filter element from interfering with airflow measurements in the first region.
Solution Approach 2:
The air metering device is extracted from the traditional position within the filter element and relocated to a separate first region of the housing. This extraction removes the metering device from the turbulent flow path created by the filter element, allowing accurate measurements while maintaining filtration functionality in the second region.
2Object-affected harmful factors
If filter elements are installed within the housing, then contaminant filtration is improved, but airflow stability deteriorates due to excessive turbulence
Solution Approach 1:
The housing interior is segmented into a first region for airflow measurement and a second region for filtration. This segmentation creates distinct flow paths where the filter element processes contaminants in the second region while the first region maintains stable, laminar flow conditions suitable for metering devices.
Solution Approach 2:
The housing structure acts as an intermediary that channels airflow through the filter element in the second region while protecting the first region from turbulence. The spatial arrangement and housing geometry mediate between the turbulent filtration process and the stable measurement requirements.
Data Source
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AI summary
An air filter assembly having a primary filter element, a secondary filter element, and a housing with an outlet tube is disclosed. The primary filter element is operably installed within the housing and has an interior volume. The secondary filter element is operably installed within the primary filter element interior volume and has an interior volume defined by a first wall extending between a closed end cap and an opposite open end cap. The open end cap of the secondary filter element defines a sealing structure having a first portion extending into the secondary filter interior volume. The outlet tube is operably connected to the housing air outlet opening and includes an inset collar being at least partially disposed within the secondary filter interior volume and extending over at least a part of the sealing structure first portion.