Non-Return Valve Flap Geometry for Low-Resistance Counterflow Blocking
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Solution Overview
Problem
Existing non-return valves in flow channels, particularly in exhaust gas systems, face challenges in allowing unhindered airflow in the intended direction while effectively preventing counter-air flow without additional components or complex mechanisms.
Innovation Solution
A non-return valve design with a blocking flap mounted on a housing featuring a hinge region transitioning into an offset blocking flap stop region, made from elastic plastic material, allowing unhindered airflow and utilizing the flap's elasticity and offset geometry to ensure reliable closure against counter-air flow without springs or additional devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking flap is used to prevent counter-air flow, then reliability of counter-flow prevention is improved, but device complexity increases due to additional components and mechanisms
Solution Approach 1:
The patent extracts and eliminates springs, weights, and other additional components from the non-return valve design. The blocking flap is mounted directly on the housing opening edge without any auxiliary mechanisms, simplifying the device while maintaining reliability through the offset geometry of the blocking flap stop region relative to the hinge region.
Solution Approach 2:
The blocking flap utilizes its own weight and the offset geometry of its mounting to achieve automatic closure. The blocking flap stop region is positioned offset in the outflow direction relative to the hinge region, creating a self-closing mechanism that prevents counter-flow without external assistance from springs or other components.
2Reliability
If a blocking flap mechanism is added to prevent counter-flow, then counter-air flow prevention is improved, but ease of manufacture deteriorates due to complex assembly requirements
Solution Approach 1:
The patent removes springs, weights, and complex mounting mechanisms from the design. The blocking flap is directly mounted on the housing opening edge with the blocking flap stop region offset relative to the hinge region, enabling simple manufacturing and assembly without additional components.
3Reliability
If a blocking flap is positioned to effectively block counter-flow, then counter-air flow prevention is improved, but airflow obstruction in the intended direction increases
Solution Approach 1:
The blocking flap is designed with different functional zones: the blocking flap stop region is offset in the outflow direction to ensure effective sealing against counter-flow, while the free portion of the blocking flap extends into the flow channel to minimize obstruction of forward airflow. This local differentiation of geometry optimizes both sealing and flow characteristics.
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 design ensures minimal airflow obstruction in the intended direction and robust counter-air flow prevention, enhancing operational reliability and reducing assembly complexity and maintenance issues.
Implementation Method 1
Both the support web and the blocking flap are made from an elastic plastic material. The support web extends across the outflow opening and the blocking flap rests on the support web in a blocking position, closing the outflow opening.
Data Source
AI summary
A non-return valve for a flow channel has a housing and an outflow opening that can be closed by a pivoting blocking flap. The blocking flap has a dome-shaped bulge. An opening edge of the outflow opening has a hinge region for the blocking flap that transitions into a blocking flap stop region circumferentially opposite the hinge region. The blocking flap stop region is offset so that the opening edge has a progression that is curved in the circumferential direction and in the outflow direction. The housing has an indentation in the circumferential direction, which is not closed by the blocking flap such that the indentation forms a condensate chamber when the housing is inserted into the surrounding flow channel. The indentation is equipped with a flow opening, through which a condensate accumulating in the condensate chamber delimited by the indentation can flow in the interior of the housing.