Conductive Fluororesin Film for Static Discharge in Pressure Sensors
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Solution Overview
Problem
Conventional pressure sensors face issues with static electricity accumulation on the pressure-sensitive portion, leading to defects and reduced pressure transmission accuracy, especially when dealing with fluids of high volume resistivity like ultrapure water.
Innovation Solution
A pressure detection device featuring a thin film-like protective portion made of conductive fluororesin material with dispersed carbon nanotubes, connected to a ground potential, which effectively guides static electricity away from the fluid contact surface and ensures accurate pressure transmission without contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum foil is attached to the pressure-sensitive portion to discharge static electricity, then static electricity discharge is improved, but pressure transmission accuracy deteriorates
Solution Approach 1:
The patent uses a composite material consisting of fluororesin and carbon nanotubes to form the protective portion. This composite structure provides both static electricity discharge capability through the conductive carbon nanotubes and accurate pressure transmission through the thin film structure, resolving the contradiction between reliability and measurement precision.
Solution Approach 2:
The protective portion is designed as a thin film structure that allows pressure to be transmitted accurately while providing a conductive path for static electricity discharge. The thin film nature ensures minimal interference with pressure transmission while the conductive properties handle static electricity, simultaneously achieving both reliability and measurement precision.
2Reliability
If fluororesin material is used for the pressure-sensitive portion to resist chemical corrosion, then chemical resistance is improved, but static electricity accumulation worsens
Solution Approach 1:
The patent combines fluororesin material with carbon nanotubes to create a composite that maintains the chemical resistance properties of fluororesin while adding conductive properties through carbon nanotubes. This composite structure enables static electricity discharge while preserving chemical corrosion resistance.
Solution Approach 2:
The protective portion is designed with localized conductive properties through carbon nanotube dispersion in the fluororesin matrix. This local quality approach allows the material to exhibit both chemical resistance (from fluororesin) and static electricity discharge capability (from carbon nanotubes) in the same component.
3Reliability
If aluminum foil is sandwiched between the pressure-sensitive portion and sensor element, then static electricity discharge is improved, but device complexity increases
Solution Approach 1:
The patent merges the protective function and static electricity discharge function into a single integrated protective portion made of conductive fluororesin material. This eliminates the need for separate aluminum foil layers and simplifies the overall structure while maintaining both protection and static electricity discharge capabilities.
Solution Approach 2:
The protective portion serves multiple functions simultaneously: it protects the pressure-sensitive portion from chemical corrosion, discharges static electricity through its conductive properties, and transmits pressure accurately due to its thin film structure. This multi-functionality reduces device complexity by consolidating multiple components into one.
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 enables highly accurate pressure detection of fluids while preventing static electricity accumulation and contamination, maintaining the integrity of the pressure detection process.
Implementation Method 1
The protective portion is formed of a conductive fluororesin material including a fluororesin material and carbon nanotubes dispersed in the fluororesin material, and is connected to a ground portion maintained at a ground potential. Static electricity generated on the fluid contact surface of the protective portion due to a friction with the fluid is guided to the ground portion via the inside of the protective portion from the fluid contact surface.
Implementation Method 2
static electricity generated on the fluid contact surface of the protective portion due to a friction with the fluid
Implementation Method 3
the pressure of the fluid can be highly accurately transmitted from the protective portion to the pressure detection portion
Data Source
AI summary
Provided is a pressure detection device including a pressure detection unit configured to detect a pressure to be transmitted to a pressure sensor, and a flow channel unit on which the pressure detection unit is disposed. The pressure detection unit) includes a pressure sensor and a conductive protective film disposed in contact with the pressure sensor, the conductive protective film breaking contact between the pressure sensor and a fluid. The conductive protective film is formed of a conductive fluororesin material including a fluororesin material and a conductive material dispersed in the fluororesin material and is connected to a ground portion maintained at a ground potential.