Self-testing duct environment detector

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Solution Overview

Problem

Current methods for testing duct smoke detectors are labor-intensive and prone to errors, as they require physical access and can lead to air leakage issues, compromising the detector's ability to detect smoke due to improper sealing or blockages.

Innovation Solution

A self-testing duct environment detector system with a venturi pipe system, airflow monitor, and particulate generator that uses differential pressure and airflow measurement techniques to assess airflow rates and detect potential issues like blockages or leaks, allowing for remote monitoring and maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual testing with physical access is used, then functional testing can be performed, but labor intensity increases and air leakage risks arise

Engineering Contradiction:

Improvedetection reliabilityVSAvoidmaintenance complexity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The detector performs self-testing by automatically generating test smoke particles internally and measuring its own response, eliminating the need for external manual intervention while maintaining detection reliability

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system performs preliminary functional tests before actual smoke detection is needed, including airflow verification and sensor responsiveness checks, ensuring the detector is ready for operation without requiring later manual intervention

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If detector housing cover is removed for testing, then functional tests can be conducted, but seal damage and air leakage risks increase

Engineering Contradiction:

Improvetesting accessibilityVSAvoidseal integrity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The detector houses internal test smoke generation capabilities within the sealed housing, allowing functional testing without removing the cover or compromising seal integrity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

An internal test smoke generation apparatus serves as an intermediary, providing the necessary test conditions within the sealed housing without requiring external access or seal disruption

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If synthetic smoke is sprayed directly into sensor, then smoke alarm condition can be triggered, but labor intensity increases

Engineering Contradiction:

Improvealarm functionalityVSAvoidmaintenance efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The detector automatically generates test smoke particles using an internal apparatus, eliminating the need for external smoke spraying and enabling autonomous functional verification

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The manual mechanical process of spraying smoke is replaced by an automated electrochemical or thermal smoke generation system within the detector, improving maintenance efficiency

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Measurement precision

If manual pressure measurement is performed, then airflow verification can be done, but time consumption increases

Engineering Contradiction:

Improveairflow measurementVSAvoidtesting duration

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The detector continuously monitors airflow through the sensing chamber using an integrated flow sensor, eliminating the need for discrete manual measurement events and reducing time consumption

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

Manual pressure measurement with external apparatus is replaced by an integrated electronic flow sensor that automatically and continuously measures airflow through the detector housing

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 efficient and accurate self-testing of duct environment detectors, reducing labor costs and ensuring effective smoke detection by identifying airflow issues and maintaining system integrity without physical intervention.

Implementation Method 1

uses differential pressure and airflow measurement techniques to assess airflow rates

Methodology Applied

Scientific EffectDifferential pressure: Pressure Drop

Implementation Method 2

A self-testing duct environment detector uses a housing containing an environmental element detector and connects, through a venturi pipe system tube, into a duct

Methodology Applied

Scientific EffectVenturi effect: Venturi Effect

Data Source

PatentUS20240346917A1Self-testing duct environment detector

Publication Date: 2024.10.17 HONEYWELL INTERNATIONAL INC

AI summary

Devices, methods, and systems of a self-testing duct environment detector are described herein. One self-testing duct environment detector system includes a first portion to be mounted outside of a duct, the first portion having a detector housing with a space therein, the space having a detector with a sensing chamber and a self-testing sensing apparatus therein, wherein the self-testing sensing apparatus determines whether airflow through the detector housing is above a threshold and a second portion and third portion each configured to extend into the duct, wherein the second portion has at least one inlet aperture formed therein and wherein the third portion has at least on outlet aperture therein.