Backwashing Fluid Filter Assembly With Peripheral Slot Piston
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Solution Overview
Problem
Existing fluid filtration systems with pleated cylindrical filter media face inefficiencies in backwashing, as the discharge port of rotating members is ineffective in creating a substantial pressure differential, leading to reduced backwashing effectiveness and the need for system shutdown and high contaminated liquid disposal.
Innovation Solution
A fluid filtration assembly with a pressure vessel, a piston having a peripheral slot, and a purge tube connected to a drain chamber, allowing for localized backflow and progressive movement along the pleated filter media, enabling effective backwashing without interrupting process flow and minimizing contaminated discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotating member with drain port is used for backwashing cylindrical filter media, then localized back flushing is achieved, but backwashing effectiveness is reduced for pleated filter configurations
Solution Approach 1:
The piston is equipped with peripheral slots at specific locations that create localized backwashing zones. These slots are strategically positioned to contact the pleated filter media at multiple points around the piston circumference, creating localized pressure differentials that effectively dislodge contaminants from the pleated surfaces without requiring system shutdown.
Solution Approach 2:
The backwashing action is segmented into multiple discrete contact points around the piston circumference rather than a single centralized port. This segmentation allows the backwashing force to be distributed across multiple locations on the pleated filter media, improving overall effectiveness while maintaining system operation.
2Reliability
If traditional backwashing by reverse flow is employed, then filtered particles are dislodged from filter media, but system shutdown is required and high volume of contaminated liquid must be disposed
Solution Approach 1:
Instead of applying reverse flow pressure to the entire filter media surface (which would require system shutdown), the invention applies partial backwashing action through peripheral slots that contact only specific regions of the pleated filter media. This localized approach is sufficient to dislodge contaminants while allowing the rest of the system to continue operating, thus maintaining productivity.
Solution Approach 2:
The system performs self-cleaning through the piston's backwashing action while remaining in service. The peripheral slots create localized backflow that automatically dislodges contaminants during normal operation without requiring external intervention or system shutdown, enabling continuous productivity.
3Stress or pressure
If rotating member with single drain port is used, then backwashing is achieved for smooth cylindrical filters, but pressure differential is insufficient for pleated regions
Solution Approach 1:
The piston features peripheral slots positioned to create localized high-pressure differential zones that directly contact the pleated filter media regions. This localized pressure application overcomes the insufficient pressure differential problem by concentrating backwashing force exactly where needed on the complex pleated surfaces.
Solution Approach 2:
The invention transitions from a single-point (0D) or line (1D) drain port approach to a distributed circumferential (2D) array of peripheral slots on the piston. This dimensional change allows pressure differential to be applied across multiple locations simultaneously, effectively addressing the geometric complexity of pleated filter configurations.
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
Enables effective backwashing of pleated cylindrical filter media without shutting down the system, maintaining process flow and reducing contaminated liquid disposal, by creating a pressure differential through a piston and purge tube system.
Implementation Method 1
creating a pressure in the piston peripheral port significantly less than the outlet pressure on the exterior side of the filter media thereby creating a localized back flow through the filter media
Data Source
AI summary
A fluid pressure vessel has a filter cartridge with spaced headers positioning cylindrical pleated filter media. The headers form an inlet chamber communicating with the inlet upstream side of the filter media and an isolated outlet chamber communicating with the downstream side of the filter media. A hollow piston with a toothed periphery having a circumferential slot is positioned closely adjacent the upstream side of the filter media. The piston hollow communicates with a drain chamber isolated from the inlet and outlet chambers. Upon opening of the drain chamber to atmospheric pressure, the pressure in the piston hollow and slot causes a lower pressure in a localized area of the media and back flushing of trapped material on the upstream side of the media to the drain chamber. An actuator is connected to selectively progressively move the piston and slot along the entire surface of the media.