Adjustable Safety Cabinet Front Opening With Airflow Feedback
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Solution Overview
Problem
Existing safety cabinets have a fixed front opening size, limiting the movable range of a worker's hand and posing difficulties for workers of varying heights, particularly those with low body height, as the fixed opening size restricts both arm movement and visual access to the working space.
Innovation Solution
The safety cabinet features an adjustable front opening size, controlled by a sensor that adjusts the air flow rates independently to maintain a predetermined air velocity and prevent contamination, allowing for adjustable height settings to accommodate different worker heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the front opening size is increased to improve hand movement range, then the movable range of hand is improved, but the air flow control becomes more difficult to maintain predetermined air velocity
Solution Approach 1:
The patent applies dynamics by making the front opening size adjustable rather than fixed. The front shutter can be moved to change the opening area according to different operational needs, allowing the system to adapt between maximizing hand movement range and maintaining proper air velocity control for different working conditions
Solution Approach 2:
The patent changes the parameter of front opening area from a fixed value to a variable parameter. By adjusting the front shutter position, the opening area can be modified to match different operational requirements, thereby resolving the contradiction between needing large opening for hand movement and small opening for air velocity control
2Reliability
If the front opening size is fixed at standard size, then the air flow rate is maintained at constant degree, but the usability for workers of various heights is limited
Solution Approach 1:
The patent makes the front opening size dynamic and adjustable to accommodate workers of various heights. The front shutter can be positioned at different heights and openings, allowing shorter workers to access the working space comfortably while maintaining proper air flow control through coordinated blower adjustment
Solution Approach 2:
The safety cabinet is designed to serve multiple height requirements through the adjustable front opening. The system can accommodate different worker sizes while maintaining its primary function of air flow control, making it universally applicable to different users
3Ease of operation
If the front opening size is increased for low body height workers, then the visual access to working space is improved, but the air intake flow rate increases causing contamination risk
Solution Approach 1:
The patent employs feedback control where flow rate sensors monitor the air flow through the front opening and provide information to the blower control system. When the front opening is enlarged for better visual access, the system automatically adjusts the blower to maintain appropriate air velocity, preventing contamination while allowing larger openings
Solution Approach 2:
The system changes multiple parameters simultaneously - both the front opening area and the blower flow rate are adjusted together. This coordinated parameter change allows the front opening to be enlarged for visual access while the air flow rate is controlled to prevent contamination
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
This design enhances usability for workers of various heights by ensuring effective air circulation and contamination prevention, regardless of the front opening size, thereby improving operational ease and safety.
Implementation Method 1
a blower (6) and a first air cleaner (5) through which the blower (6) supplies a clean air into a working space (3)
Implementation Method 2
a discharge system including a second air cleaner (4) through which an air taken through the front opening (10) into the safety cabinet (1) is discharged from the safety cabinet (1)
Data Source
AI summary
A safety cabinet adaptable for a variation in body height of a worker using the safety cabinet, that is, a safety cabinet which prevents various bacteria from proceeding from the outside of the safety cabinet into a working space of the safety cabinet and prevents bacteria or virus from proceeding from the working space to the outside of the safety cabinet irrespective of a change in opening area of a front opening, is provided. A flow velocity of a clean air supplied into the working space and a flow velocity of the air flowing through the front opening are set at respective velocities predetermined to keep a physical isolation for preventing the contamination in accordance with a size of the front opening. Further, in the safety cabinet, the size of the front opening communicating with the working space under the front surface shutter is adjustable between 200 mm and 300 m.