Magnetic Pressure Sensor Recess Bonding
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Solution Overview
Problem
Existing pressure detection devices face issues with the connecting parts joining the pressure receiving diaphragm of the flow path unit separating due to deformation caused by changes in fluid pressure, leading to inaccurate pressure detection.
Innovation Solution
A pressure detection device is designed with a flow path unit and a pressure detection unit, where the first connecting part on the pressure detection unit and the second connecting part on the flow path unit are magnetically attracted. The second connecting part is joined to both the bottom and side faces of a recess on the pressure receiving diaphragm using an adhesive agent, ensuring a secure connection even under pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second connecting part is joined to a flat face on the pressure detection unit side of the diaphragm of a flow path unit by an adhesive agent, then the connecting part can be attached to the diaphragm, but deformation of the diaphragm due to pressure changes causes stress in the joining portion, leading to deterioration and separation of the connecting part
Solution Approach 1:
The patent replaces the flat face joining surface with a spherical (curved) surface. The pressure receiving diaphragm has a spherical portion that protrudes toward the pressure detection unit side, and the second connecting part is joined to this curved surface. This curvature allows the joining portion to accommodate diaphragm deformation more effectively, distributing stress and preventing separation while maintaining connection reliability under pressure changes.
2Measurement precision
If the second connecting part is joined to the diaphragm, then pressure detection can be enabled, but repeated diaphragm deformation causes deterioration of the joining portion, making it no longer possible to properly detect pressure
Solution Approach 1:
The spherical portion of the pressure receiving diaphragm provides a curved joining surface that accommodates repeated deformation cycles. This curvature design distributes mechanical stress more evenly across the adhesive bonding area, preventing stress concentration and deterioration that would otherwise occur with flat surfaces during repeated pressure cycling, thereby extending the service life while maintaining pressure detection accuracy.
Solution Approach 2:
The patent applies different geometric characteristics to different parts of the diaphragm. The pressure receiving portion maintains its original flat or slightly curved geometry for optimal pressure sensing, while a specific localized region is formed as a spherical protrusion specifically for the connecting part joining. This local quality differentiation allows the joining area to handle deformation stresses while the main sensing area maintains measurement precision.
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 configuration allows for accurate detection of both positive and negative fluid pressures while preventing the connecting parts from separating, thus enhancing the reliability and durability of the pressure detection device.
Implementation Method 1
the first connecting part and the second connecting part are arranged attracted to each other by magnetic force
Implementation Method 2
joined to the recess with an adhesive agent being filled between a side face of the recess and the second connecting part
Implementation Method 3
a resin pressure receiving part configured to displace in response to receiving a pressure of a fluid flowing through the flow path
Data Source
AI summary
Provided is a pressure detection device in which a pressure detection unit includes the pressure sensor and a first connecting part that is a magnet, the flow path unit includes a resin pressure receiving diaphragm and a second connecting part that is a magnetic material joined to the pressure receiving diaphragm, the first and the second connecting parts are arranged attracted to each other by magnetic force in a state where the flow path unit is attached to the pressure detection unit, the pressure receiving diaphragm is formed circularly, a recess that is circular is formed at the center position thereof, and the second connecting part is formed circularly in planar view, is in contact with the bottom face of the recess, and is joined to the recess with an adhesive agent being filled between the side face of the recess and the second connecting part.