Hollow Mechanical Oscillator for Vibration Level Switch
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Solution Overview
Problem
Existing vibration limit switches face challenges with insufficient frequency change between air and medium frequencies due to pressure-induced and temperature-induced fluctuations, leading to potential false detections.
Innovation Solution
A hollow mechanical vibrator with a reduced mass and increased stability is designed, featuring a casing with a closed interior and a support structure of hollow chambers and foamed material, produced using additive manufacturing methods like 3D printing, to enhance frequency change and measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid mechanical oscillator is used, then the structure is stable and strong, but the frequency change between air and medium is insufficient leading to false detections
Solution Approach 1:
The patent changes the physical parameter of the mechanical oscillator from solid to hollow structure. This parameter change reduces the mass and increases the air frequency, thereby amplifying the frequency change when the oscillator is covered with measurement medium. The hollow structure achieves a frequency change of at least 5 Hz, and preferably at least 10 Hz, which is sufficient to distinguish from pressure-induced and temperature-induced frequency fluctuations.
Solution Approach 2:
The patent employs a composite structure combining a hollow casing with a filling material that has reduced density compared to the shell material. This composite approach maintains structural stability and strength while minimizing mass. The filling material provides internal support to prevent casing deformation, yet its low density ensures the overall oscillator remains lightweight for optimal frequency response.
2Weight of moving object
If the wall thickness of the mechanical oscillator is reduced to decrease weight, then the air frequency increases, but the stability and strength of the oscillator decreases
Solution Approach 1:
The patent applies local quality by providing a filling material specifically inside the hollow casing where it is needed for structural support. The filling is not uniformly distributed throughout the entire oscillator but is contained within the casing, providing localized reinforcement. This allows the wall thickness to be reduced (50-500 μm) while maintaining overall stability through the internal support structure.
Solution Approach 2:
The patent uses a composite structure with a hollow casing and a low-density filling material. This composite design achieves optimal balance between weight reduction and structural strength. The casing provides the hollow structure for frequency optimization, while the filling material provides internal support to prevent deformation, creating a synergistic effect that satisfies both lightweight and stability requirements.
3Weight of moving object
If a hollow mechanical oscillator is used, then the weight is reduced and air frequency is increased, but the mechanical stability under stress decreases
Solution Approach 1:
The patent applies local quality by providing a filling material specifically inside the hollow casing where it is needed for structural support. The filling is not uniformly distributed throughout the entire oscillator but is contained within the casing, providing localized reinforcement. This allows the wall thickness to be reduced (50-500 μm) while maintaining overall stability through the internal support structure.
Solution Approach 2:
The filling material acts as a cushioning element inside the hollow casing, providing beforehand protection against mechanical stress. When external forces are applied, the filling material prevents the thin-walled casing from deforming or collapsing, thereby maintaining the structural integrity and stability of the hollow oscillator structure.
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 solution results in a significant increase in air frequency and frequency change when immersed in a medium, reducing false detections and improving measurement results with enhanced stability and reduced weight.
Implementation Method 1
a diaphragm (5) that can be excited to vibration by a drive (3) and a mechanical oscillator (7) arranged on the diaphragm (5)
Data Source
Figure 1
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AI summary
Vibration sensor (1) with a membrane (5) which can be excited to vibration via a drive (3) and a mechanical oscillator (7) arranged on the membrane (5), wherein the mechanical oscillator (7) has a shell (9) with at least one closed interior space (11)