Broadband Fuel Cell Muffler With Venturi Drainage for Water Buildup
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Solution Overview
Problem
Existing broadband mufflers for fuel cell vehicles face challenges with slow response, high cost, and failure due to water accumulation, and are not effective in attenuating broadband noise across a wide frequency range.
Innovation Solution
A broadband muffler with an integrated water separation structure and ultra-wideband noise attenuation, featuring a first and second housing, an inner cannula with specific openings and holes, a water collection tank, and a venturi tube for drainage, along with sound-absorbing cotton for noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a broadband muffler is designed for broadband noise generated by a turbocharger, then broadband noise attenuation is achieved, but the muffler fails due to water accumulation at the fuel cell exhaust end
Solution Approach 1:
The patent extracts the water management function from the traditional muffler design by adding a separate water collection tank and drainage system. The water collection tank is disposed in the second housing and connected to the exhaust port through a venturi tube, allowing water to be separated and drained from the exhaust flow path, preventing water accumulation while maintaining noise attenuation performance
Solution Approach 2:
The muffler is designed to perform multiple functions simultaneously: noise attenuation across broad frequency bands and water management. The integrated design combines sound-absorbing materials for noise reduction with a water collection and drainage system, enabling the single device to handle both acoustic and fluid management requirements of fuel cell exhaust systems
2Reliability
If a broadband muffler is designed with complex structure for wide frequency attenuation, then noise attenuation performance improves, but response time increases and cost increases
Solution Approach 1:
The muffler is segmented into multiple functional chambers with different opening geometries (square/rectangular openings in one chamber, round holes in another chamber). Each chamber targets specific frequency bands, allowing effective broad-spectrum noise attenuation while keeping individual chamber designs simple and responsive
Solution Approach 2:
The patent varies geometric parameters of openings (shape, size, distribution) across different chambers to optimize noise attenuation at different frequencies. This parameter optimization achieves wideband attenuation performance without requiring overly complex structures, maintaining fast response 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 muffler effectively attenuates noise across 1000-8000 Hz, integrates drainage, and prevents failure from water accumulation, offering quick sound-absorbing cotton replacement and waterproofing for cost-effective noise reduction.
Implementation Method 1
two ends of an inlet and an outlet of the venturi tube at the exhaust port of the inner cannula form a pressure difference with a middle position. This pressure difference presses the water from the water collection tank to the inner cannula through the drainage tube
Implementation Method 2
venturi tube connected to an exhaust port of the inner cannula
Implementation Method 3
sound-absorbing cotton for noise reduction
Implementation Method 4
part of the water enters chambers of the muffler and finally flows to the water collection tank due to gravity
Data Source
AI summary
A broadband muffler for a fuel cell vehicle includes a first housing, a second housing connected to the first housing to form a sealed cavity, and an inner cannula disposed in the seal cavity and dividing the sealed cavity into chambers, the inner cannula comprising square or rectangular openings through a surface of the inner cannula in a first one of the chambers, the inner cannula comprising round holes through the surface of the inner cannula in a different one of the chambers, the square or rectangular openings and the round holes being for reducing noise. The broadband muffler further includes a water collection tank disposed in the second housing, a venturi tube connected to an exhaust port of the inner cannula, and a drainage tube disposed at a center of the venturi tube and connected to the water collection tank.