Axial-Adjustable Sensor Mount for Rotating Blade Monitoring
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Solution Overview
Problem
Existing sensor attachment structures for rotating machines cannot adjust the position of sensors in the axial direction of the casing, leading to detection range issues when the rotating blade or casing deforms due to thermal expansion, causing the blade to be out of the sensor's detection range.
Innovation Solution
A monitoring sensor system with a first section fixed to the casing and a second section that can adjust the sensor's position in the axial direction, allowing for rotational movement and eccentric placement to maintain detection even with blade or casing deformation, combined with a sensor protective part to prevent erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is fixed to the casing at a fixed position, then the structure is simple and stable, but the sensor cannot track the blade when thermal expansion causes relative position changes
Solution Approach 1:
The sensor attachment structure is designed with dynamic adjustability, allowing the sensor to move in the axial direction to track the blade's position changes caused by thermal expansion. The second section can be adjusted axially relative to the first section, transforming a static structure into a dynamic one that adapts to operating conditions.
Solution Approach 2:
The sensor attachment structure is divided into multiple sections: a first section fixed to the casing and a second section holding the sensor that can be adjusted axially. This segmentation allows independent adjustment of the sensor position while maintaining the stability of the fixed mounting portion.
2Adaptability or versatility
If the sensor position is adjustable in the axial direction, then the sensor can track the blade during thermal expansion, but the attachment structure becomes more complex
Solution Approach 1:
The attachment structure incorporates dynamic adjustability through the second section that can move axially relative to the first section, enabling the sensor to adapt to blade position changes while maintaining a relatively simple overall structure through modular design.
Solution Approach 2:
The adjustment mechanism utilizes axial direction movement (adding a degree of freedom in the axial dimension) to achieve position adaptability, rather than complicating the radial or circumferential adjustment mechanisms.
3Reliability
If the sensor remains at a fixed position, then the structure is stable, but the blade may go out of detection range due to thermal expansion
Solution Approach 1:
The sensor position is made dynamically adjustable in the axial direction, allowing operators to reposition the sensor to track the blade during thermal expansion, thereby maintaining detection reliability while providing operational flexibility.
Solution Approach 2:
The sensor's axial position parameter can be changed to adapt to thermal expansion conditions, allowing the detection system to maintain optimal positioning despite temperature-induced dimensional changes in the rotor and casing.
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
Enables continuous monitoring of the rotating blade's state by adjusting the sensor's position to maintain alignment and preventing erosion from working fluid components, ensuring reliable vibration detection and extended sensor lifespan.
Implementation Method 1
the second section is configured to be rotatable relative to the first section about a central axis of the second section
Implementation Method 2
a sensor for detecting vibration of the rotating blade
Implementation Method 3
the rotating blade or the casing may deform by thermal expansion due to temperature increase caused by the operation
Data Source
AI summary
A monitoring sensor for a state of a blade of a rotating machine includes a sensor for monitoring a state of the blade of the rotating machine, a first section configured to be fixed to a casing of the rotating machine, and a second section holding the sensor and supported by the first section so as to be able to adjust a position of the sensor in an axial direction of the casing.