Turbo Molecular Pump Cross-Check Control for Speed Mismatch Safety
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Solution Overview
Problem
In harsh environments with high levels of ionizing radiation, controlling turbo molecular pumps remotely poses challenges, particularly in maintaining functional safety and preventing mechanical failures due to mismatched pump types and speed ratings, especially in high-speed systems.
Innovation Solution
A pump control unit with hardware-based identification circuits for pump type and speed rating, coupled with a cross-check circuit to ensure matching, inhibiting operation upon mismatch, and implementing a multi-level detection scheme for over-speed protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pump controller is disposed remotely from the pump system, then the controller is protected from ionizing radiation damage, but functional safety and reliability are compromised due to potential mismatching of pump type and speed rating
Solution Approach 1:
The patent implements a feedback mechanism where the pump controller communicates with the pump system to verify pump type and speed rating information. The controller receives feedback signals from the pump system and cross-checks them against the selected pump configuration, ensuring functional safety is maintained even when the controller is remotely disposed to protect from radiation damage.
Solution Approach 2:
The patent introduces an intermediary communication system between the remote pump controller and the pump system. This intermediary layer includes signal transmission and verification mechanisms that ensure accurate matching of pump type and speed rating, bridging the physical separation while maintaining functional safety through structured data exchange and cross-checking protocols.
2Reliability
If the pump controller is integrated within the pump system, then functional safety is ensured through mechanical integration, but the controller is exposed to ionizing radiation damage
Solution Approach 1:
The patent segments the pump system into two separate components: the pump system itself and the pump controller. This segmentation allows the controller to be disposed remotely in a benign environment protected from radiation, while the pump system operates in the harsh radiation environment. The segmentation is maintained through structured communication interfaces that ensure functional safety without physical integration.
3Adaptability or versatility
If the pump controller controls multiple different pump types, then versatility is improved, but the risk of mismatching pump type and speed rating increases
Solution Approach 1:
The patent implements comprehensive feedback mechanisms that require the pump controller to receive and verify pump type and speed rating information from each specific pump system before operation. The controller cross-checks multiple parameters and provides feedback signals to confirm proper matching, ensuring reliability is maintained even when controlling multiple different pump types with varying specifications.
Solution Approach 2:
The patent designs the pump controller with universal functionality to accommodate multiple pump types through a standardized interface that automatically adapts to different pump configurations. The controller includes built-in verification routines that universally apply to all pump types, ensuring proper matching of pump type and speed rating regardless of the specific pump variant being controlled.
Data Source
AI summary
Aspects of the present disclosure relate to a pump control unit for controlling a pump. The pump has a pump drive motor, a pump type identifier, and a pump speed rating identifier. A pump type identification circuit is configured to communicate with the pump type identifier and to output a pump type identification signal for identifying the pump type. A pump speed rating identification circuit is configured to communicate with the pump speed rating identifier and to output a pump speed rating identification signal for identifying the pump speed rating. The pump control unit has a cross-check circuit for receiving the pump type identification signal and the pump speed rating identification signal. The cross-check circuit is configured to output a mismatch signal to inhibit operation of the pump in dependence on identification of a mismatch between the identified pump type and the identified pump speed rating.