Mechanical Bearing Preload Gauge for Turbomolecular Pump Alignment
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Solution Overview
Problem
Current methods for measuring and adjusting bearing preload force in turbomolecular pumps are expensive, complex, and impractical for in-field use, lacking a simple and accurate solution.
Innovation Solution
A bearing preload force gauge with a housing, actuator, and resilient bias member that allows for the measurement and adjustment of bearing preload force without removing the gauge from the pump, featuring a mechanical indicator system that provides visual feedback on preload force alignment with predetermined ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If force transducers or load cells are used to measure preload force, then measurement accuracy is improved, but cost and device complexity increase prohibitively for in-field use
Solution Approach 1:
The patent replaces complex electronic force transducers and load cells with a purely mechanical measurement system. The indicator mechanism uses mechanical linkages, springs, and visual indicators to measure and display preload force, eliminating the need for electronic instrumentation while maintaining measurement capability for in-field use
Solution Approach 2:
The invention employs a simple, inexpensive mechanical gauge that can be used repeatedly in the field without the cost constraints of expensive electronic sensors. The mechanical components are designed to be durable yet replaceable, providing an economical solution for routine preload measurements
2Ease of manufacture
If weights with carriers are used to measure preload force, then cost is reduced, but device complexity and bulkiness increase making them impractical for in-field use
Solution Approach 1:
The measurement system is segmented into compact mechanical components housed within a portable gauge. The indicator mechanism, spring assembly, and housing are divided into integrated sub-components that fit together in a handheld form factor, making the device portable and practical for field use while maintaining low cost
Solution Approach 2:
The gauge uses dynamic mechanical elements such as springs and movable indicators that adapt to the preload force being measured. The mechanism automatically adjusts its response based on the applied force, providing a readable indication without requiring manual calibration or complex setup procedures
3Device complexity
If operator experience and feel are relied upon for preload adjustment, then device complexity is reduced, but measurement precision and reliability decrease
Solution Approach 1:
The mechanical indicator provides immediate visual feedback to the operator about the preload force status. The indicator mechanism translates the mechanical state of the bearing preload into a readable position or scale reading, allowing operators to objectively determine whether preload is within acceptable ranges without relying on subjective feel or experience
Solution Approach 2:
The gauge is designed to be self-indicating through its mechanical mechanism. The spring and indicator assembly automatically respond to the applied preload force, providing a reading that requires no interpretation beyond observing the indicator position. This eliminates the need for operator training while maintaining simplicity of the device
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 gauge offers an inexpensive, accurate, and easy-to-use solution for measuring and adjusting bearing preload force, suitable for various orientations and turbomolecular pump configurations, ensuring the preload force is within acceptable limits without the need for secondary interpretation.
Implementation Method 1
an actuator coupled to an impeller engagement surface by a member configured to provide a resilient bias between the actuator and the impeller engagement surface
Data Source
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AI summary
The invention relates to a bearing preload force gauge for indicating the bearing preload force on a turbomolecular pump rotor bearing. The gauge comprises a housing, an indicator for indicating the bearing preload force, and actuator coupled to an impeller engagement surface by a member configured to provide a resilient bias between the actuator and the impeller engagement surface. The invention also relates to a bearing preload tool and methods for measuring the bearing preload force on a turbomolecular pump.