Catalysis Combustion Gas Sensor Soaking Portion

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Solution Overview

Problem

Catalysis combustion type gas sensors face challenges in achieving uniform temperature distribution across the gas reaction film, leading to decreased detection sensitivity due to temperature unevenness and uneven heat generation, which affects the catalytic combustion of inflammable gases.

Innovation Solution

Incorporating a heat-insulating portion with a heater, a gas reaction film carrying a combustion catalyst, a temperature-measuring element, and a soaking portion that decentralizes heat transfer, ensuring uniform heat distribution across the gas reaction film, and optionally including a compensating portion to account for external temperature changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a heater is formed in the vicinity of the gas detection film to promote combustion, then the detection sensitivity for low-concentration inflammable gas is enhanced, but temperature unevenness occurs in the gas detection film

Engineering Contradiction:

Improvedetection sensitivityVSAvoidtemperature unevenness

Core Design Contradiction:

Measurement precisionVSTemperature

Solution Approach 1:

A soaking portion is introduced as an intermediary component between the heater and the gas detection film. This soaking portion receives heat from the heater and redistributes it uniformly across the gas detection film, preventing temperature unevenness while maintaining the enhanced detection sensitivity achieved by the heater.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Power

If the distribution of catalyst particles or film thickness is uneven in the gas detection film, then the amount of generated heat by combustion becomes uneven, but temperature unevenness occurs and catalytic combustion activity decreases

Engineering Contradiction:

Improvecombustion heat generationVSAvoidtemperature unevenness

Core Design Contradiction:

PowerVSTemperature

Solution Approach 1:

The soaking portion acts as a thermal mediator that receives combustion heat from various regions of the gas detection film and redistributes it uniformly. This prevents temperature unevenness that would otherwise occur due to non-uniform catalyst distribution or film thickness, ensuring consistent catalytic combustion activity across the entire film.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If temperature unevenness occurs in the gas detection film, then the amount of catalytic combustion decreases in low-temperature regions, but the detection sensitivity of the gas degrades

Engineering Contradiction:

Improvecatalytic combustion activityVSAvoiddetection sensitivity

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The soaking portion serves as a thermal equalizer that prevents temperature unevenness in the gas detection film. By ensuring uniform temperature distribution, it maintains consistent catalytic combustion activity across all regions of the film, thereby preserving high detection sensitivity for inflammable gases.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 enhances the uniformity of temperature distribution, increases detection sensitivity for inflammable gases, and improves the reproducibility of gas concentration measurements by minimizing temperature unevenness and maintaining catalytic activity.

Implementation Method 1

a heater that is formed on the heat-insulating portion

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

a gas reaction film that is formed on the heater on the heat-insulating portion and includes a carrier carrying a combustion catalyst for the inflammable gas

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 3

combust an inflammable gas by using a catalyst

Methodology Applied

Scientific EffectCombustion: Combustion

Implementation Method 4

a soaking portion that is formed on the heat-insulating portion and is arranged between the heat-insulating portion and the gas reaction film. Here, the soaking portion is configured so as to decentralize heat transferred to the soaking portion in the entire soaking portion

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 5

a temperature-measuring element that is formed in the vicinity of the gas reaction film on the heat-insulating portion

Methodology Applied

Scientific EffectThermocouple effect: Thermocouple

Data Source

PatentUS9625407B2Catalysis combustion type gas sensor

Publication Date: 2017.04.18 YAMAHA FINE TECHNOLOGIES CO LTD

AI summary

A catalysis combustion type gas sensor that detects an inflammable gas includes a heat-insulating portion; a heater that is formed on the heat-insulating portion; a gas reaction film that is formed on the heater on the heat-insulating portion and includes a carrier carrying a combustion catalyst for the inflammable gas; a temperature-measuring element that is formed in the vicinity of the gas reaction film on the heat-insulating portion; and a soaking portion that is formed on the heat-insulating portion and is arranged between the heat-insulating portion and the gas reaction film. The soaking portion is configured so as to decentralize heat transferred to the soaking portion in the entire soaking portion.