Human waste collection system, for zero-gravity conditions, that automatically closes a used waste bag segment and provides an unused waste bag segment from operation of a seat and flush actuator
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Solution Overview
Problem
Existing human waste collection systems in spacecraft require manual handling and changing of waste bags, posing challenges for the commercial space touring industry seeking economical and easy-to-apply solutions.
Innovation Solution
A human waste collection system designed for zero-gravity conditions, featuring a basin with a movable compression ring that automatically pulls an unused bag segment from a bag cassette and pushes used bags into a lower portion, along with a twist-closure mechanism for used bags and an air mover to guide waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual handling and changing of waste bags is used, then device complexity is reduced, but ease of operation deteriorates due to required manual intervention and training
Solution Approach 1:
The system performs automatic bag deployment, sealing, and replacement without manual intervention. The compression ring automatically advances new bag segments, the heating element seals bags automatically, and the peristaltic pump transfers waste between bags autonomously, allowing the system to serve itself
Solution Approach 2:
Manual mechanical operations are replaced with automated mechanisms including a peristaltic pump for waste transfer, a heating element for automatic sealing, and a compression ring for bag advancement, eliminating the need for manual bag handling while maintaining functional simplicity
2Extent of automation
If automated bag handling system is implemented, then ease of operation improves, but device complexity increases due to additional mechanisms
Solution Approach 1:
Multiple functions are merged into integrated components: the compression ring both advances new bag segments and compresses used bags for sealing, the heating element integrates with the basin to seal bags automatically, and the peristaltic pump combines waste transfer with bag replacement operations, reducing overall system complexity through functional integration
Solution Approach 2:
The compression ring serves multiple functions including advancing new bag segments, compressing used bags during sealing, and facilitating bag replacement. The heating element provides both sealing and sterilization functions, while the peristaltic pump handles both waste transfer and bag advancement, creating multi-functional components that reduce system complexity
3Productivity
If manual bag changing is used, then training requirements are reduced, but productivity deteriorates due to time-consuming manual operations
Solution Approach 1:
The system maintains continuous operation without interruption for bag changes. The peristaltic pump continuously transfers waste from the upper to lower basin, the compression ring continuously advances bag segments, and the heating element continuously seals bags as they are used, eliminating idle time and maintaining constant productivity
4Ease of operation
If automated compression ring mechanism is added, then ease of operation improves, but manufacturing complexity increases
Solution Approach 1:
The compression ring is divided into functional segments that can be manufactured separately and assembled: the ring structure itself, the compression surfaces, and the connection mechanisms to the peristaltic pump are segmented components that simplify manufacturing and assembly processes
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 automates the process of bag handling and closure, reducing manual intervention and enhancing operational efficiency in zero-gravity environments, thus addressing the challenges faced by the commercial space touring industry.
Implementation Method 1
the compression ring compresses around the unused bag segment as the compression ring moves from the upper end to the neck
Implementation Method 2
the air mover activates when the lid opens to guide waste into the unused bag segment
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A human waste collection system, for zero-gravity conditions, the collection system having: a basin (140) having a lower end (160) that defines a lower plane and configured for being positioned against a floor and an upper end (150) that is spaced apart from the lower end and displaced further from the plane than the lower end; a seat (200) positioned at the upper end of the basin, the seat having a lid (220) pivotally connected to the seat; a bag cassette (230) disposed under the seat; and a compression ring (240) that is movable within the basin to automatically pull an unused bag segment from the bag cassette, and push down used bags.