HVAC Sensor Air Duct Constriction for Stable Vehicle Airflow
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Solution Overview
Problem
Existing air duct systems in HVAC equipment of motor vehicles face issues with air flow stability and accuracy due to long flow paths and burr formations, which can compromise the measuring accuracy of air quality sensors.
Innovation Solution
The air duct system incorporates a housing with abutting housing parts forming air ducts, featuring a constriction point to stabilize air flow, which can be designed as an hourglass shape, insert piece, or screw element to ensure a stable air flow to the sensor device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If air ducts are formed in the housing with long flow paths, then the air duct system can be integrated into the housing structure, but the air flow is weakened and burr formation disturbs the air flow
Solution Approach 1:
The patent applies local quality by creating a constriction point at a specific location within the air duct where the cross-sectional area is reduced. This localized modification changes the flow characteristics at that specific point, accelerating the air flow to prevent burr formation and maintain stable flow to the sensor device, while the rest of the air duct structure remains integrated in the housing.
2Reliability
If a fan is provided in the air duct to strengthen air flow, then air flow stability is improved, but the cost of the air duct system increases
Solution Approach 1:
The patent applies self-service by designing the air duct structure itself to generate the necessary flow conditions. The constriction point creates a pressure differential that naturally accelerates the air flow through the sensor device without requiring an external fan or active control mechanism. The system uses its own structural features to achieve the desired flow stability.
3Reliability
If the cross section of the air duct is reduced at a constriction point, then air flow stability is improved and burr formation is prevented, but the air duct design becomes more complex
Solution Approach 1:
The patent merges the constriction point feature directly into the housing structure itself, rather than using a separate component. The constriction is formed as an integral part of the air duct geometry within the housing, combining the housing structure and flow control function into a single integrated design, thereby minimizing additional complexity.
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 constriction point enhances air flow stability, preventing burr formation and dust accumulation, thereby improving the measuring accuracy of air quality sensors.
Implementation Method 1
the at least one air duct has at least one constriction point at which the cross section of the at least one air duct through which air can pass is reduced
Data Source
AI summary
An air duct system for conducting air within an HVAC equipment of a motor vehicle may include a housing of the HVAC equipment, a sensor through which air is flowable, and at least one air duct connected to the sensor in an air-conducting manner. The housing may include (i) a first housing part with a first connecting surface and (ii) a second housing part with a second connecting surface. The first housing part and the second housing part may abut one another and may be fixedly connected to each other via the first and second connecting surface. The at least one air duct may be formed, at least in regions, between the first and second connecting surface. The at least one air duct may have at least one constriction point at which a cross-section of the at least one air duct is reduced.