Pressure Sensor Adhesive Spring Core Stability
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Solution Overview
Problem
Existing pressure sensors for domestic electrical appliances face challenges in achieving precise linearity and stability of oscillation frequency due to unstable positional relativity between the magnetic core, operating spring, and coil, leading to inconsistent performance.
Innovation Solution
The pressure sensor design includes a housing with a diaphragm and a magnetic core linked to an operating spring, where at least one end of the spring is bonded with an adhesive layer to the magnetic core or adjustment bolt, and compensating elastic components are used to ensure integral movement of the spring and core, improving precision and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the operating spring is made of metallic material with gaps between ends and plastic material, then the spring can provide elastic operation, but the positional relativity becomes unstable causing the spring to sway or tilt
Solution Approach 1:
A magnetic adhesive layer is introduced as an intermediary between the metallic operating spring and the plastic magnetic core. This adhesive layer acts as a mediator that eliminates gaps and prevents direct contact that causes swaying and tilting, while maintaining the elastic operation of the spring through its flexible yet bonding properties.
2Measurement precision
If the magnetic core moves reciprocatively with the membrane deformation, then the inductance varies in response to pressure changes, but mild internal vibration is generated affecting the locus of the magnetic core
Solution Approach 1:
The magnetic adhesive layer serves as an intermediary between the magnetic core and the operating spring, dampening mild internal vibrations that occur during reciprocation. This adhesive layer stabilizes the locus of the magnetic core while allowing it to move in response to membrane deformation for pressure detection.
Solution Approach 2:
The magnetic adhesive layer changes the mechanical coupling parameters between the magnetic core and operating spring, transitioning from a gap-based loose connection to an adhesive-bonded stable connection. This parameter change reduces vibration and stabilizes the magnetic core's movement path.
3Ease of manufacture
If gaps of different widths exist between the operating spring ends and plastic material, then assembly is easier, but the operating spring deviates from its predetermined position with different magnitudes
Solution Approach 1:
The magnetic adhesive layer is applied to the ends of the operating spring as an intermediary that compensates for gaps of different widths. This adhesive layer ensures uniform bonding and positioning, eliminating the need for precise gap control while maintaining manufacturing precision through the adhesive's consistent bonding properties.
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 enhances the precision and consistency of pressure sensor performance by maintaining the relative position of the operating spring and magnetic core, resulting in stable and linearly changing oscillation frequencies in response to pressure changes.
Implementation Method 1
at least one of the top end and the bottom end of the operating spring is provided with an adhesive layer
Implementation Method 2
a deformable membrane sensitive to air pressure. When the pressure changes, deformation of the membrane takes place
Implementation Method 3
the inductance of the coil is varied in response to movements of the magnetic core
Implementation Method 4
The coil and capacitors form an oscillator circuit in response to the change in inductance of the coil, and the oscillator circuit is capable of producing oscillating electronic signals with variable frequency
Data Source
AI summary
A pressure sensor that includes a housing with an upper housing part and a lower housing part, the upper housing part and the lower housing part being configured such that a chamber is formed between them. A diaphragm is provided between the upper housing part and the lower housing part, and dividing the chamber into an upper chamber and a lower chamber. A magnetic core is linked to the diaphragm. An operating spring includes a top end and a bottom end, the top end being supported against the upper housing part and the bottom end being supported against the magnetic core. At least one of the top end and the bottom end of the operating spring is provided with an adhesive layer. The pressure sensor enables the operating spring and the magnetic core to move integrally with each other, thereby improving the precision of the pressure sensor.