Fan assembly for cleanrooms
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Solution Overview
Problem
Existing cleanroom technologies face inefficiencies in particle removal due to turbulence and blockages in suction systems, particularly when using side wall or floor-based suction methods, which fail to maintain predefined airborne particle concentrations.
Innovation Solution
A fan assembly with a central conveying channel on the floor, connected to suction members and equipped with through holes and a discharge outlet, prevents microturbulences and effectively expels particles and liquids, ensuring efficient particle removal and maintenance of particle concentration limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a side wall suction duct is used, then the suction unit can be arranged on the chamber wall, but microturbulences occur that prevent efficient particle elimination
Solution Approach 1:
The suction system transitions from side wall arrangement to floor-based central conveying channel, changing the spatial dimension of suction entry. This dimensional shift eliminates microturbulences by providing a centralized suction path that maintains laminar flow patterns, thereby resolving the contradiction between ease of arrangement and particle elimination efficiency
2Reliability
If floor-based suction holes are used, then uniform suction distribution can be achieved, but the holes become blocked by foreign bodies from washing and sanitising fluids
Solution Approach 1:
The patent employs a floor grille structure that acts as a flexible permeable barrier, allowing air and particles to pass through while preventing larger foreign bodies from blocking the suction holes. This resolves the contradiction by maintaining uniform suction distribution while eliminating blockage issues through the selective permeability of the grille structure
Solution Approach 2:
The suction system is segmented into multiple functional components: floor grilles, conveying channels, and suction units. This segmentation allows the suction holes to remain small and numerous for uniform distribution, while the larger conveying channels carry away debris and prevent blockages, resolving the contradiction between uniform suction and blockage prevention
3Reliability
If central conveying channel is used, then microturbulences are prevented and particle removal is efficient, but the device complexity increases
Solution Approach 1:
The central conveying channel serves multiple functions: it acts as a suction inlet, a debris collection conduit, and a structural support element for the floor grille. By combining these functions into a single integrated structure, the patent achieves efficient particle removal without proportionally increasing device complexity, as the same structure performs multiple roles
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 fan assembly efficiently removes airborne particles and contaminants by minimizing turbulence and preventing blockages, maintaining the desired particle concentration levels within cleanrooms while being cost-effective and simple to implement.
Implementation Method 1
suction members (not shown in the drawings) of the air for extracting the gas from chamber 2
Implementation Method 2
suction members of the air for extracting the gas from chamber 2
Implementation Method 3
conveying channel 3 for the gas and for liquid substances present in the chamber 2
Implementation Method 4
Each side wall 5a of the casing 5 is provided with through holes 6 which place the chamber 2 into communication with the conveying channel 3
Data Source
AI summary
A fan assembly for cleanrooms includes a chamber defined by a floor, two opposing side walls and an upper wall, an inlet unit for introducing a laminar stream of gas into said chamber directed towards the floor, said chamber being arranged in such a way as to be internally invested by the gas introduced by the inlet unit, where said assembly further includes a conveying channel for the gas and for liquid substances present within the chamber positioned on the floor, said conveying channel is surmounted by a casing defined by an upper wall and by two opposing side walls and each side wall of the casing, being provided with through openings that place the chamber into communication with the conveying channel, said opposing side walls of the casing are arranged spaced apart from the respective opposing side walls of the chamber.