Check Valve Housing Hinge Pin Interface Design

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Solution Overview

Problem

Check valves in bleed systems face challenges in withstanding high opening velocities and repeated impacts between flappers and the compliant stop, leading to fatigue wear at the hinge pin and housing interfaces.

Innovation Solution

A check valve housing design with specifically sized hinge pin interfaces, where the ratio of the hinge pin hole diameter to the thickness of the interface is between 2.44 and 2.66, to reduce stress and prevent premature wear, along with a method of assembling the check valve with aligned hinge supports and flappers to ensure proper positioning and operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the flappers are designed to pivot at high angular velocity to quickly close the valve, then the response speed of the check valve is improved, but the hinge pin and housing interfaces are subjected to increased fatigue wear and stress

Engineering Contradiction:

Improveopening velocity of flappersVSAvoiddurability of hinge pin interface

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent changes the geometric parameters of the hinge pin interface by specifying a diameter-to-thickness ratio between 2.44 and 2.66. This parameter optimization allows the interface to better withstand the high angular velocity pivoting of flappers, distributing stresses more effectively and reducing fatigue wear while maintaining the required opening speed performance

Inventive Principle:

Principle #35Parameter changes

2Stress or pressure

If the compliant stop is designed with limited contact areas to reduce stress concentration, then the local stress on flappers is reduced, but the stop cannot adequately absorb the repeated impacts from high velocity flapper closure

Engineering Contradiction:

Improvecontact stress on flappersVSAvoidimpact absorption capacity of stop

Core Design Contradiction:

Stress or pressureVSStrength

Solution Approach 1:

The patent optimizes the geometric parameters of the hinge pin interface (diameter-to-thickness ratio between 2.44 and 2.66) to create a more robust connection that can handle the impact forces. This parameter change allows the system to maintain limited contact areas for stress reduction while the strengthened interface geometry provides sufficient impact absorption capacity

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the hinge pin interface is designed with larger contact areas to distribute stress, then the fatigue wear resistance is improved, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvefatigue wear resistance of hinge pin interfaceVSAvoidcomplexity of hinge support structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent achieves improved fatigue wear resistance through optimizing the diameter-to-thickness ratio parameter of the existing hinge pin interface geometry, rather than adding complex structural elements. This parameter-based solution maintains simplicity while effectively distributing stresses to resist fatigue wear

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9476515B2Check valve housing

Publication Date: 2016.10.25 HAMILTON SUNDSTRAND CORP

AI summary

A check valve housing for a check valve is provided and includes check valve housing body. First and second hinge supports extend from the check valve housing body. A stop is coupled to the first and second hinge supports. The first hinge support includes a first hinge pin interface having a first hinge pin hole to receive a hinge pin. A ratio of a diameter of the first hinge pin hole to a thickness of the first hinge pin interface is between 2.44 and 2.66.