Damper Blade Guide Baffle Flow Distribution
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Solution Overview
Problem
In fabric filter systems, the skewed flow distribution of dust-laden gas due to the difference in flow directions between the gas plenum and inlet channels leads to localized high velocities, causing abrasion damage to filter bags and structures, especially in side-entry style constructions where space constraints prevent the use of guide vanes for flow control.
Innovation Solution
A gas flow control device with a damper blade and attached guide baffles that pivot around a horizontal axis, allowing for efficient flow distribution control without extending the length of the inlet channels, by directing the guide baffles parallel to the second main flow direction and extending over most of the damper blade's length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If guide vanes are arranged at the upstream end of inlet channels to control flow distribution, then flow distribution is improved, but device complexity and space requirements increase
Solution Approach 1:
The guide baffles are integrated with the damper blade to form a single combined structure. The damper blade serves dual functions: flow control through its pivoting motion and flow distribution guidance through the attached guide baffles. This merging eliminates the need for separate guide vane components, reducing device complexity while maintaining flow distribution control capability.
Solution Approach 2:
The damper blade is designed to perform multiple functions simultaneously. It acts as both a flow control device (by pivoting to regulate gas flow) and a flow distribution guide (through the attached guide baffles that direct flow patterns). This multi-functionality reduces the overall number of components needed in the system.
2Manufacturing precision
If inlet channels are made relatively long to accommodate guide vanes, then flow control is improved, but system compactness and ease of construction deteriorate
Solution Approach 1:
The guide baffles are positioned at the upstream end of the inlet channel, close to the damper blade, to pre-direct the flow pattern before the gas enters the main inlet channel. This preliminary flow conditioning allows for shorter inlet channels while still achieving effective flow control and distribution.
3Adaptability or versatility
If damper blade pivots with large angle to regulate flow, then flow control range is improved, but structural stability and reliability worsen
Solution Approach 1:
The guide baffles are strategically positioned at specific locations on the damper blade to provide flow guidance where most needed. This localized approach allows effective flow distribution control without requiring the entire damper blade structure to be overly robust, maintaining structural reliability while achieving good flow control range.
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
This solution balances the flow distribution, minimizes dust abrasion damage, and maintains a compact system design by allowing for effective flow control with fewer and larger guide baffles, reducing manufacturing and maintenance complexity compared to conventional systems.
Implementation Method 1
at least one substantially planar guide baffle is attached to each of the two substantially planar surfaces of the damper blade... the at least one guide baffle extending in the open position of the damper blade substantially parallel to the second main flow direction... for controlling the distribution of the dust-laden gas flow
Implementation Method 2
the damper blade being arranged to be pivoted through a definite pivoting angle around a substantially horizontal pivot axis... for regulating the flow of the dust-laden gas in the inlet channel
Data Source
AI summary
A gas flow control device and a filtering system for a flow of dust-laden gas. The gas flow control device includes a damper blade arranged to be pivoted through a definite pivoting angle around a substantially horizontal pivot axis, for regulating the flow of the dust-laden gas in an inlet channel by pivoting the damper blade between an open position and a closed position. At least one substantially planar guide baffle is attached to each of two opposite, substantially planar surfaces of the damper blade, the at least one guide baffle extending from the pivot axis in the direction of the normal of the general plane of the damper blade substantially to an opposite inner surface of the inlet channel, for controlling the distribution of the dust-laden gas flow to a fabric filter enclosure.