External Wire Damping for Fill Limit Vent Valve Noise
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Solution Overview
Problem
Existing noise attenuation systems for fill limit vent valves in fuel tanks face issues such as profile elongation, degradation of damping devices, and difficult manufacturing and installation, leading to potential valve fixation and noise generation during float actuation.
Innovation Solution
A noise attenuation device comprising a flexible, adjustable wire that engages with the float's protuberance outside an annular passage, absorbing kinetic energy and providing a soft landing while aiding in lifting the float, thus reducing noise and being easily installable on existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a damping device is inserted between the valve body and lower end of the FLVV, then noise from float actuation is reduced, but the valve profile becomes elongated and manufacturing/installation becomes difficult
Solution Approach 1:
The noise attenuation device is extracted from the interior of the FLVV and positioned externally. The flexible wire is attached to the exterior surface of the lower end, allowing the damping function to be provided without increasing the overall valve profile or requiring internal space for the damping mechanism.
Solution Approach 2:
The flexible wire acts as an intermediary element between the float and the exterior surface of the lower end. It provides the damping function by absorbing kinetic energy during float actuation while maintaining a compact valve structure and simplifying installation compared to internal damping devices.
2Object-affected harmful factors
If a damping device is inserted between the valve body and lower end of the FLVV, then noise from float actuation is reduced, but manufacturing and installation become difficult due to disassembly requirements
Solution Approach 1:
The noise attenuation device is extracted from the interior of the FLVV and positioned externally. The flexible wire is attached to the exterior surface of the lower end, allowing the damping function to be provided without increasing the overall valve profile or requiring internal space for the damping mechanism.
Solution Approach 2:
The flexible wire acts as an intermediary element between the float and the exterior surface of the lower end. It provides the damping function by absorbing kinetic energy during float actuation while maintaining a compact valve structure and simplifying installation compared to internal damping devices.
3Object-affected harmful factors
If a damping device is used inside the FLVV, then noise is reduced, but the device may degrade and cause valve fixation preventing fuel entry
Solution Approach 1:
The noise attenuation device is extracted from the interior of the FLVV and positioned externally. The flexible wire is attached to the exterior surface of the lower end, allowing the damping function to be provided without increasing the overall valve profile or requiring internal space for the damping mechanism.
Solution Approach 2:
The flexible wire acts as an intermediary element between the float and the exterior surface of the lower end. It provides the damping function by absorbing kinetic energy during float actuation while maintaining a compact valve structure and simplifying installation compared to internal damping devices.
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 device effectively decreases noise generated by the float's contact with the valve base by absorbing and reusing kinetic energy, providing a reliable and convenient solution for noise reduction without impeding the valve's functionality.
Implementation Method 1
The noise attenuation device may absorb a portion of kinetic energy from the float as it moves to the lower position
Implementation Method 2
The noise attenuation device comprises a soft landing platform for the float while also providing a mechanism to aid in lifting the float
Data Source
AI summary
Systems are provided for a noise attenuation device for a valve. In one example, a system may include a single noise attenuation device located below a base of a fill limit vent valve.