Orbital Pump Safety Device Aperture Constraint
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Solution Overview
Problem
Existing orbital pumps face issues with component failure leading to contact between moving parts, causing damage, due to inadequate anti-rotation devices that fail to maintain accurate radial clearances.
Innovation Solution
A safety device comprising a first member fixed to one interleaved part and a second member with an aperture that prevents movement beyond the orbital path, ensuring components do not contact and includes conductive parts to complete a circuit for motor shutdown in case of incorrect movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing anti-rotation devices are used to maintain radial clearances, then the orbital motion is maintained, but component failure can occur leading to contact between moving parts
Solution Approach 1:
The safety device is divided into separate members: a first member attached to one interleaved part and a second member with an aperture attached to the other interleaved part. This segmentation allows the safety function to be independent from the anti-rotation mechanism, preventing component failure without adding complex integrated systems.
Solution Approach 2:
The aperture acts as an intermediary element between the two interleaved parts. It provides a controlled space that allows orbital motion while preventing excessive movement and contact. The aperture mediates the interaction between moving parts, enabling safe operation even if anti-rotation devices fail.
2Manufacturing precision
If the aperture is dimensioned to prevent movement beyond orbital path, then contact between parts is prevented, but the aperture must be precisely sized to accommodate orbital motion
Solution Approach 1:
The aperture is pre-dimensioned during manufacturing to account for the exact orbital path dimensions. By calculating and preparing the correct aperture size in advance, the device ensures that orbital motion is accommodated while preventing excessive movement, eliminating the need for complex adjustment mechanisms during operation.
3Reliability
If conductive parts are added to complete a shutdown circuit, then automatic protection is provided, but the device complexity increases
Solution Approach 1:
The safety device combines mechanical protection (aperture limiting movement) with electrical protection (conductive parts completing a shutdown circuit) into a single integrated system. This merging provides multiple protection mechanisms without requiring separate independent devices, reducing overall system complexity while enhancing reliability.
Solution Approach 2:
The safety device performs multiple functions: it limits mechanical movement through the aperture, provides electrical shutdown capability through conductive parts, and offers both preventive and reactive protection. This multi-functionality allows a single device to replace what would otherwise require multiple separate protection systems.
Data Source
AI summary
A safety device for an orbital pump has first and second interleaved parts which are operable to follow an orbital path with respect to each other, the safety device comprising: a first member fixable with respect to the first interleaved part; and a second member fixable with respect to the second interleaved part, the second member defining an aperture into which the first member is receivable, the aperture being dimensioned to prevent movement of the first interleaved part with respect to the second interleaved part beyond the orbital path. In this way, the members of the safety device help to prevent the moving components of the pump contacting, thereby preventing damage.