Vibration Sensor Diaphragm Electromagnetic Bolt
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Solution Overview
Problem
Existing vibration sensors face issues with resonant frequency changes due to direct force coupling between the converter device and the membrane, which stiffens the membrane and is not suitable for high-temperature applications, as piezoelectric elements are prone to mechanical damage and thermal instability.
Innovation Solution
A vibration sensor design featuring a converter device with a coil and a magnetizable bolt that interacts with the membrane without a direct non-positive connection, allowing the bolt to oscillate within a magnetic field, inducing current in the coil and causing the bolt to vibrate, thus minimizing influence on the resonant frequency, and using temperature-resistant materials like ceramic for components to operate up to 450°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If piezoelectric elements are used in the converter device, then the membrane can be driven to vibrate, but the membrane is stiffened and the resonant frequency changes
Solution Approach 1:
The patent replaces the mechanical piezoelectric drive system with an electromagnetic system consisting of a coil and a magnetizable bolt. The coil generates a magnetic field that interacts with the magnetizable bolt to drive vibrations, eliminating the direct mechanical coupling and stiffening effect that piezoelectric elements had on the membrane.
Solution Approach 2:
The magnetizable bolt serves as an intermediary between the coil and the membrane. The bolt is attracted to the coil when current flows through it, and this attraction force vibrates the bolt, which in turn vibrates the membrane indirectly without the bolt being rigidly clamped to the membrane.
2Power
If piezoelectric elements are used in the converter device, then the membrane can be driven to vibrate, but the piezoelectric elements are prone to mechanical damage at high temperatures
Solution Approach 1:
The patent replaces the piezoelectric mechanical system with an electromagnetic system (coil and magnetizable bolt) that has no moving mechanical parts subject to stress. The coil and bolt can withstand high temperatures up to 450°C without the mechanical damage risks that plague piezoelectric elements.
3Power
If the converter device is rigidly connected to the membrane, then the drive force is effectively transmitted, but the thermal behavior becomes unstable over large temperature ranges
Solution Approach 1:
The patent introduces dynamic, flexible connections instead of rigid fixed connections. The magnetizable bolt is held by a holding element that allows movement, and the connection between the bolt and membrane is flexible, enabling the system to adapt to thermal expansion and contraction without losing functionality or stability.
4Strength
If the entire surface or peripheral section of the clamping disk is clamped against the membrane, then the converter device is securely mounted, but the membrane is excessively stiffened
Solution Approach 1:
The magnetizable bolt acts as an intermediary that transmits vibration energy to the membrane without requiring broad clamping contact. The bolt makes localized contact points rather than distributed clamping, providing secure mounting while preserving the membrane's natural vibration characteristics.
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
This design reduces the impact of the converter device on the vibration frequency, enabling operation at high temperatures without mechanical damage to the piezoelectric elements and ensuring stable thermal behavior, allowing for accurate vibration measurement without stiffening the membrane.
Implementation Method 1
the coil and the bolt being arranged to interact in such a way that vibration of the bolt causes a current to flow in the coil induced and a magnetic field inducing current flow in the coil causes a vibration of the bolt
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a vibration sensor having a diaphragm (2) which can be caused to oscillate, having a transducer device (4) for causing the diaphragm (2) to oscillate (S) and/or for tapping off an oscillation (S) of the diaphragm (2) and having an oscillating body (3) and/or a diaphragm (2) in the form of an oscillating body for transmitting the oscillations (S) from the diaphragm (2) into a surrounding area (7) and/or from a surrounding area (7) onto the diaphragm (2). The transducer device (4) has a coil (8) and a bolt (6), the bolt (6) being connected to the diaphragm (2) for the purpose of transmitting the oscillations (S) to or from the diaphragm (2), and the coil (8) and the bolt (6) being arranged so as to interact with one another in such a way that an oscillation (S) of the bolt (6) induces a current flow in the coil (8) and/or a current flow inducing a magnetic field (B) in the coil (8) brings about an oscillation of the bolt (6).