Filter Lock Seal System Prevents Lifting
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Solution Overview
Problem
Existing filter assembly mounting and sealing systems in dust collectors are prone to unintentional lifting due to thermal variations and vibrations, leading to seal loss between the filter assembly and the tubesheet, especially under reverse flow pulsing conditions.
Innovation Solution
A filter lock and seal system featuring a snap band with a deformable portion and a reverse C-shaped curled strip, encapsulated by a flexible cover, which creates a triple seal between the filter assembly and the tubesheet by engaging with the tubesheet end and a secondary gasket, preventing accidental lifting and maintaining a secure seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a snap band is used to seal the filter assembly to the tubesheet, then sealing is achieved, but the filter assembly can lift from the tubesheet under thermal variations, vibrations, and reverse flow pulsing
Solution Approach 1:
The locking mechanism is divided into multiple independent elements: a lock band with locking teeth, a lock plate with corresponding recesses, and a lock spring. This segmentation allows each element to perform its specific function independently, providing reliable locking while accommodating thermal expansion and vibration through controlled movement of individual components.
Solution Approach 2:
The lock spring acts as an intermediary element between the lock plate and the lock band, providing continuous contact force to maintain the locked position while allowing for thermal expansion and vibration. The spring mediates the interaction between rigid locking components and flexible filter assembly, preventing direct stress transmission that could cause lifting.
2Reliability
If the snap band is compressed to ensure sealing, then seal integrity is improved, but excessive compression creates deleterious material set
Solution Approach 1:
The locking mechanism applies localized compression only at the sealing interface between the lock band and the filter assembly flange, rather than compressing the entire snap band. This localized approach ensures adequate sealing pressure at the critical sealing location while avoiding excessive compression of the flexible cover and deformable portion, preventing material set and degradation.
3Reliability
If a rigid sealing interface is used between the filter assembly and tubesheet, then sealing is achieved, but thermal variations cause lifting
Solution Approach 1:
The locking mechanism transitions from a rigid fixed connection to a dynamic adjustable connection. The lock plate can move within its recesses, the lock spring can compress and extend, and the deformable portion of the flexible cover can deform elastically. This dynamic capability allows the sealing interface to adapt to thermal expansion and contraction of the filter assembly while maintaining effective sealing through continuous contact pressure.
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 system effectively prevents unintentional lifting of the filter assembly and maintains a reliable seal, ensuring maximum filtration efficiency by providing a secure interface between the filter assembly and the tubesheet, even under varying operational conditions.
Implementation Method 1
the snap band includes a deformable portion covering over the band cavity which deforms into the band cavity in the installed position
Implementation Method 2
The flexible cover encapsulating the snap band and defining an annular seat surface on the inner side of the snap band for cooperatively engaging with the seat portion of the top end cap when in the installed position
Data Source
AI summary
The present concept a filter lock and seal system for sealing a filter assembly to a tubesheet includes a filter assembly which includes filter media mounted between top and bottom end caps. The top end cap includes an annular seat portion extending longitudinally from the top of a lower flange and terminating at an annular radial outward projecting shoulder. The filter assembly further includes a snap band for sealing the filter assembly to the tubesheet and cooperatively seating against the annular seat portion. Wherein the snap band including a cavity and a deformable portion for engaging with a tubesheet end.