Safety cabinet
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Solution Overview
Problem
Existing safety cabinets for handling pathogens in research and medicine development do not accommodate workers in both sitting and standing postures, limiting flexibility and workspace purity.
Innovation Solution
A safety cabinet design featuring a front shutter that slides upward and downward with lateral sliding small window shutters, along with dual air barriers formed by normal and purified air, allowing workers to work in either posture while maintaining workspace purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional front shutter design is used, then the safety cabinet can maintain a simple structure, but it cannot accommodate workers in both sitting and standing postures
Solution Approach 1:
The front shutter is divided into multiple independent segments: an upper shutter and a lower shutter that can move independently, plus small window shutters within the lower shutter. This segmentation allows different parts of the shutter to be positioned at different heights, accommodating both sitting and standing workers while maintaining overall structural coherence.
Solution Approach 2:
The shutter system is designed with dynamic adjustability, allowing the upper and lower shutters to slide vertically along guides, and the small window shutters to slide laterally. This dynamic configuration enables the shutter to adapt to different worker postures and operational requirements, transforming a static structure into a versatile interface.
2Ease of operation
If the front shutter is opened to allow worker access, then worker accessibility is improved, but workspace purity may be compromised
Solution Approach 1:
Dual air barriers are introduced as intermediary elements between the external environment and the workspace. These air barriers, formed by controlled airflow, create protective zones that prevent contamination while allowing the shutter to remain open for worker access. The air barriers act as a mediator that reconciles the conflicting requirements of accessibility and purity.
Solution Approach 2:
The safety cabinet employs pneumatic control through HEPA filters and airflow management systems. Purified air is supplied into the workspace, and exhaust air is drawn out, creating positive pressure differentials that maintain workspace purity. This pneumatic system works in conjunction with the shutter mechanism to protect the workspace during open-shutter operations.
3Object-affected harmful factors
If a single air barrier is used, then the airflow system is simple, but purity cannot be secured over a wide range in the workspace
Solution Approach 1:
The air barrier system is segmented into dual barriers: a primary air barrier formed by purified air supply and a secondary air barrier formed by exhaust air extraction. This segmentation allows each barrier to perform a specific function, with the primary barrier providing purification and the secondary barrier preventing contamination ingress, together covering a wider range of the workspace.
Solution Approach 2:
The dual air barriers are positioned at different locations and orientations to address different contamination risks. The first barrier focuses on purification from the front opening, while the second barrier addresses contamination from the sides and top. This local differentiation of air barrier functions ensures comprehensive purity coverage throughout the workspace.
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 flexible work postures for workers and maintains purity over a wide range by minimizing airflow turbulence and contamination risks.
Implementation Method 1
a blowout HEPA filter is provided in an upper portion of a work space... air is uniformly supplied from the blowout HEPA filter to the work space
Implementation Method 2
an exhaust fan is provided at a rear portion, and a back flow path that allows air to be sucked in from the work space to the external environment through the exhaust fan
Data Source
AI summary
A safety cabinet that includes an opening portion in a front surface of a work space and a front shutter, and supplies purified air into the work space from above. The front shutter slides in an upward and downward direction to close a part or an entirety of the opening portion. The front shutter includes a small window shutter that slides in a lateral direction.