Laminar Air Flow Cabinet Cleaning That Protects HEPA Filters
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Solution Overview
Problem
Existing cleaning mechanisms for laminar air flow cabinets, such as ultraviolet and physical systems, are inefficient for chemical and microbiological cleaning and can damage delicate components like HEPA, ULPA, or activated carbon filters due to high-pressure water use, leading to filter deterioration and inadequate drainage.
Innovation Solution
A laminar air flow cabinet with a cleaning system featuring an air recycling duct, impermeable surface with a gradient for fluid drainage, and full-cone nozzles for controlled fluid injection, ensuring filters remain intact and allowing for efficient chemical and microbiological cleaning without wetting the filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If physical cleaning systems use pressurized water to clean the cabinet, then cleaning effectiveness is improved, but the filters (HEPA, ULPA, activated carbon) deteriorate due to contact with liquid
Solution Approach 1:
The cabinet interior is divided into distinct zones: a cleaning zone where pressurized spray can operate, and a protected zone where filters are located. The impermeable surface with gradient creates a drainage pathway that segments the fluid flow, directing it away from the filter area while maintaining cleaning capability in the working zone.
Solution Approach 2:
The impermeable surface with gradient acts as an intermediary element between the cleaning spray and the filters. It receives the cleaning fluid, directs it through controlled drainage paths, and prevents direct contact with the filters, thus mediating the interaction between cleaning operations and filter protection.
2Productivity
If high-pressure water spray is used for cleaning, then chemical residues are removed effectively, but water splashing wets the filters causing deterioration
Solution Approach 1:
The impermeable surface is strategically positioned and shaped with specific gradient characteristics to create localized fluid control. The surface has different properties in different areas: it is impermeable in the cleaning zone to direct spray flow, and has gradient slopes in the drainage zone to channel water away from sensitive filter areas.
Solution Approach 2:
The impermeable surface with gradient serves as a mediator that intercepts water splashing from high-pressure spray, redirects it through defined drainage paths, and prevents it from reaching the filters, thus eliminating the harmful effect of water contact.
3Productivity
If conventional drainage systems are used, then water removal is achieved, but inadequate drainage allows water to pool and wet the filters
Solution Approach 1:
The impermeable surface is designed with a gradient that creates a continuous drainage pathway from higher to lower points. This gradient structure ensures that water naturally flows along the surface toward drainage openings without pooling, maintaining constant drainage efficiency and preventing water accumulation near filter areas.
Solution Approach 2:
The drainage system is integrated into the geometry of the impermeable surface itself, utilizing the third dimension (surface slope/gradient) to create drainage pathways. Instead of separate drainage components, the surface shape itself directs water flow, adding a dimensional aspect to the drainage function.
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 cleans the cabinet components while protecting the filters by directing cleaning fluid to specific regions and using a controlled flow to prevent damage, ensuring the filters' integrity and operational efficiency.
Implementation Method 1
at least one spray located in the laminar flow portion; a hydraulic pump which injects fluid through the spray
Implementation Method 2
the impermeable surface has a gradient which directs the cleaning fluid to a drain
Implementation Method 3
at least one fan driving air from the first of the adjacent portions mentioned through an upper filter to the laminar flow portion
Data Source
AI summary
A laminar air flow cabinet of the type comprising a laminar flow portion and two adjacent portions, a first adjacent portion located above the laminar portion and a second adjacent portion located below the laminar flow portion, in which the cabinet comprises at least one fan blowing air from the first of these adjacent portions to the laminar flow portion through a first filter, and a second filter located in the second of the adjacent portions, the cabinet comprising at least one spray located in the laminar flow portion, a hydraulic pump injecting fluid through the spray and at least one impermeable surface located between the second filter and the laminar flow portion.