Clean Room Ceiling Diffusers for Adjustable Protective Airflow
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Solution Overview
Problem
Current air distribution systems in clean rooms, such as operating theaters, fail to provide flexible and controlled airflow patterns, leading to contamination risks and inadequate thermal comfort, as they lack adjustable velocity and reverse flow control, and are not suited for different operational scenarios.
Innovation Solution
A protective air supply system with two air supply diffusers in the ceiling, one directing air towards the clean area and the other towards the perimeter, along with a controller to adjust airflow volumes and ratios, allowing for customizable airflow modes like isolation and normal patient modes, ensuring contaminant control and thermal comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a high wall or ceiling/wall corner supply is used, then air supply reaches the floor area, but it blows settled contaminants into the operational area
Solution Approach 1:
Instead of supplying air from high wall or corner positions that blow contaminants upward, the invention supplies air from ceiling positions directly downward into the clean area. This inverted approach prevents the upward transport of settled contaminants while still achieving comprehensive air distribution coverage.
Solution Approach 2:
The invention extracts the air supply function from traditional high wall or corner positions and relocates it to ceiling-mounted diffusers positioned over the clean area. This separation allows independent control of air supply location and direction, preventing contaminant redistribution while maintaining operational coverage.
2Object-affected harmful factors
If parallel flow system with two elongated air supply devices is used, then air supply reaches the center of the critical zone, but the jet velocity is not adjustable and reverse flow from periphery poses risk
Solution Approach 1:
The invention introduces adjustable velocity control for each air supply diffuser, transforming the static parallel flow system into a dynamic one. The controller can independently adjust the jet velocity of each diffuser to prevent reverse flow from periphery while maintaining protective airflow into the clean area, providing adaptability for different operational scenarios.
Solution Approach 2:
The controller provides multi-functional capability by enabling different airflow patterns (e.g., both diffusers operating, one diffuser operating, or isolated mode) to address various contamination risks. This universal control system can adapt to different operational requirements while maintaining contaminant protection.
3Ease of operation
If swirl diffusers in ceiling are used, then air supply is provided symmetrically, but contaminated air can enter wound area from floor level and velocity conditions cannot be controlled
Solution Approach 1:
The invention replaces fixed swirl diffusers with adjustable velocity diffusers that can dynamically control airflow patterns. The controller can adjust velocity to prevent reverse flow from floor level while maintaining symmetrical distribution, eliminating the harmful effect of uncontrollable velocity conditions.
Solution Approach 2:
The controller monitors airflow conditions and adjusts diffuser velocities to maintain protective airflow patterns. This feedback mechanism ensures that symmetrical air distribution continues to provide contamination protection while adapting to prevent reverse flow into the clean area.
4Ease of manufacture
If air supply system is designed based on fixed distance from center, then simple installation is achieved, but excessive velocity within center cannot be avoided and jet velocity is not adjustable
Solution Approach 1:
The invention adds velocity adjustability to the fixed-distance diffuser configuration, allowing the system to maintain installation simplicity while dynamically controlling jet velocity to prevent excessive velocity in the center and reverse flow risks. The controller enables adaptive velocity management without changing the physical installation layout.
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 provides adjustable and flexible air supply that prevents contaminant backflow, maintains thermal comfort, and adjusts airflow according to different scenarios, enhancing safety and indoor air quality in clean rooms.
Implementation Method 1
Each of the supply air diffusers is configured to diffuse a first air flow, having a first air flow volume A l/s, directed along a ceiling of the clean room and towards the clean area; and a second air flow, having a second air flow volume B l/s, directed along the ceiling of the clean room and towards a perimeter of the clean room
Implementation Method 2
Each of the supply air diffusers is configured to diffuse a first air flow
Data Source
AI summary
A protective air supply system for controlling air supply flows in a clean room comprises a first air supply diffuser and a second air supply diffuser, arranged within a ceiling of the clean room on opposite sides of the clean area and spaced from side walls of the clean room, wherein each supply air diffuser is provided with nozzles configured to diffuse a first air flow having a first air flow volume directed along a ceiling of the clean room and towards the clean area and a second air flow having a second air flow volume directed along the ceiling of the clean room and towards a perimeter of the clean room, and a controller coupled to the air supply diffusers and configured to adjust the first and second air flow volumes and their ratio.