Flat Pressure Sensing Metal Diaphragm with Linear Elastic Deformation

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Solution Overview

Problem

Conventional wave-shaped pressure sensing metal diaphragms have low sensitivity to small pressure changes and undergo non-linear deformation due to plastic deformation, leading to imprecision in pressure gauge measurements, especially for fluids with lower pressures.

Innovation Solution

A flat pressure sensing metal diaphragm with a through hole and go-through structure, featuring radially arranged incisions and connection portions that deform linearly in response to pressure, combined with a pressure sensing non-metal diaphragm and a pressure gauge assembly that includes a movable shaft and valve member to accurately measure pressure values.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a wave-shaped diaphragm is used, then the diaphragm can maintain its shape after plastic deformation, but the sensitivity to small pressure changes is reduced and measurement precision deteriorates

Engineering Contradiction:

Improvediaphragm shape stabilityVSAvoidpressure measurement precision

Core Design Contradiction:

Stability of the object's compositionVSMeasurement precision

Solution Approach 1:

The patent changes the geometric parameters of the diaphragm from wave-shaped to flat-shaped, and modifies the deformation mode from plastic deformation to elastic deformation. This parameter change allows the diaphragm to maintain linear elastic deformation within the elastic limit, achieving both shape stability and high measurement precision for small pressure changes.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent inverts the conventional approach by using a flat diaphragm instead of a wave-shaped diaphragm, and by operating within the elastic deformation range rather than allowing plastic deformation. This inversion resolves the contradiction by achieving shape stability through elastic recovery rather than permanent plastic shaping.

Inventive Principle:

Principle #13The other way round (Inversion)

2Shape

If a wave-shaped diaphragm is formed by pressing with high forming pressure, then the diaphragm can maintain a wave shape, but the non-linear deformation causes imprecision in pressure gauge readings

Engineering Contradiction:

Improvewave shapeVSAvoidpressure gauge reading precision

Core Design Contradiction:

ShapeVSManufacturing precision

Solution Approach 1:

The patent changes the deformation parameter from plastic deformation (requiring high forming pressure) to elastic deformation (within elastic limit). This allows the diaphragm to maintain its flat shape without requiring excessive forming pressure, thereby achieving both shape consistency and manufacturing precision.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical pressing process that causes plastic deformation with an elastic deformation mechanism. By operating within the elastic limit, the diaphragm returns to its original flat shape after deformation, eliminating the non-linear behavior associated with plastic deformation and improving measurement precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If a flat diaphragm is used instead of wave-shaped, then sensitivity to small pressure changes is improved, but the diaphragm may deform non-linearly under high pressure

Engineering Contradiction:

Improvepressure sensitivityVSAvoidpressure resistance

Core Design Contradiction:

Measurement precisionVSStrength

Solution Approach 1:

The patent optimizes the thickness parameter of the flat diaphragm to ensure it remains within the elastic deformation range under operating pressures. By controlling the thickness and operating parameters, the diaphragm maintains linear elastic deformation even under pressure, achieving both high sensitivity and sufficient pressure resistance.

Inventive Principle:

Principle #35Parameter changes

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 provides consistent physical characteristics across the sensing region, enhancing sensitivity to small pressure changes and improving measurement precision by ensuring linear deformation and effective fluid isolation, thus enhancing the accuracy of pressure gauge readings.

Implementation Method 1

The main body extends flat so that the main body can deform in proportion to the stress linearly, which ensures the pressure sensing metal diaphragm can be precisely responsive to the stress

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

the first side portion being disposed on a side of the pressure sensing metal diaphragm and covering the go-through structure of the pressure sensing metal diaphragm so that the go-through structure of the pressure sensing metal diaphragm is non-communicated with the second side portion

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentUS11604109B1Pressure sensing metal diaphragm, pressure sensing diaphragm assembly and pressure gauge

Publication Date: 2023.03.14 MULTI LORE

AI summary

A pressure sensing metal diaphragm configured for deforming according to a pressure is provided, including: a main body, extending flat, including a through hole and a go-through structure configured for insertion of a movable. A pressure sensing diaphragm assembly including the pressure sensing metal diaphragm and a pressure sensing non-metal diaphragm is further provided, wherein the pressure sensing non-metal diaphragm covers the go-through structure. A pressure gauge including the pressure sensing diaphragm assembly is further provided.