Vacuum Insulation Material Frequency Response Evaluation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing methods for evaluating the internal vacuum degree of vacuum insulation materials are unreliable due to sensitivity of sensors and require strong stress application, making them inefficient for quality inspection.

Innovation Solution

An apparatus and method that applies impact to the surface of the vacuum insulation material to measure its natural frequency, allowing for the evaluation of internal vacuum degree without strong stress or long evaluation times, using a rigid body or getter to ensure surface flatness and hardness, and processing displacement or acceleration data via Fourier Transform to determine the vacuum level.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If thermal resistance measurement method is used to evaluate internal vacuum degree, then evaluation can be performed based on heat flux and potential values, but strong stress must be applied to the surface for a long period of time and sensor sensitivity affects reliability

Engineering Contradiction:

Improveinternal vacuum degree evaluation accuracyVSAvoidevaluation time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces the thermal measurement system with a mechanical vibration system. Instead of measuring heat flux and potential values to determine thermal resistance, the invention applies impact force to generate mechanical vibrations and measures the natural frequency of the vacuum insulation material. This substitution eliminates the need for long-term stress application and sensor sensitivity issues, providing faster and more reliable vacuum degree evaluation through frequency measurement.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the measurement parameter from thermal resistance to natural frequency. By measuring the natural frequency of the vacuum insulation material under impact, the system can directly evaluate the internal vacuum degree without requiring prolonged stress application. The natural frequency serves as a new parameter that correlates with vacuum level, enabling rapid assessment.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If thermal resistance measurement method is used to evaluate internal vacuum degree, then evaluation can be performed, but strong stress must be applied to the surface for a long period of time

Engineering Contradiction:

Improvevacuum evaluation reliabilityVSAvoidsurface stress

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If impact is applied to evaluate internal vacuum degree, then evaluation time is reduced, but surface flatness and hardness affect the accuracy of the measurement

Engineering Contradiction:

Improveevaluation efficiencyVSAvoidnatural frequency measurement accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by introducing a rigid body with specific surface properties (flatness and hardness) at the impact location. This localized modification ensures that the impact area has consistent and suitable characteristics for accurate frequency measurement, while the rest of the vacuum insulation material maintains its original structure and vacuum properties.

Inventive Principle:

Principle #3Local quality

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

Enables accurate and efficient evaluation of internal vacuum degree based on rigidity, reducing stress and time requirements, facilitating quality inspection of vacuum insulation materials.

Implementation Method 1

A vacuum insulation material includes a porous filler (core) and a barrier (barrier film) surrounding the filler, and has very low thermal conductivity by removing gas from the barrier film to maintain a vacuum for several years or more.

Methodology Applied

Scientific EffectVacuum: Vacuum

Implementation Method 2

an apparatus for evaluating an internal vacuum degree of a vacuum insulation material, which applies impact force to a surface of the vacuum insulation material and then measure a natural frequency of the vacuum insulation material to evaluate the internal vacuum degree

Methodology Applied

Scientific EffectNatural frequency: Resonance

Data Source

PatentUS9194782B2Vacuum thermal-insulation material, and a device and method for assessing the degree of vacuum in the vacuum insulation material by using the frequency response method

Publication Date: 2015.11.24 ES GLOBAL CO LTD

AI summary

Disclosed herein is a vacuum insulation material, which includes a barrier film and a core, wherein a rigid body thinner than a reference thickness or a getter harder than a reference hardness is formed between the barrier film and the core, or the rigid body thinner than the reference thickness is formed on the getter formed between the barrier film and the core to ensure surface flatness and surface hardness of the vacuum insulation material.