Offset Radiant Heating Assembly for Consistent Smoke Generation

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Solution Overview

Problem

Existing smoke generation methods for testing smoke detectors are inconsistent due to direct contact between rising smoke and particulate with radiant heat sources, leading to heat intensity variations and potential fires, and the square-shaped configuration of radiant heat sources results in non-uniform heating and difficulty in adjusting heat intensity.

Innovation Solution

A heat-generating apparatus with a frame assembly and adjustable heating support assembly, where the heating elements are offset from the target material, allowing for precise positioning and heat application to generate consistent smoke and particulate without direct contact, featuring a securement assembly for vertical orientation of the target material and adjustable heating elements along multiple axes for controlled heat distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If radiant heat sources are positioned directly over the target material, then consistent heat application is achieved, but smoke and particulate contact the heat sources causing inconsistency, failure, and fire hazards

Engineering Contradiction:

Improveheat consistencyVSAvoidheat source reliability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent extracts the heating function from direct contact with smoke by positioning radiant heat sources above and offset from the smoke generation zone. The heat sources are separated from the harmful smoke environment while maintaining thermal effectiveness through radiant heat transfer, eliminating contact-related failures and fire hazards.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces radiant heat as an intermediary energy transfer mechanism. Instead of direct contact heating, radiant heat sources transfer thermal energy through electromagnetic radiation to the target material and surrounding air, enabling heat application without physical contact between hot surfaces and smoke/particulate.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If radiant heat sources are positioned remotely in a square configuration, then contact with smoke is prevented, but heating uniformity deteriorates and adjustment difficulty increases

Engineering Contradiction:

Improveheat source protectionVSAvoidheating uniformity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent transitions from a symmetric square configuration to an asymmetric arrangement where heat sources are positioned above and offset from the target material. This asymmetric positioning creates optimal radiant heat distribution patterns that maintain uniform heating while preventing smoke contact, and allows easier adjustment of heat intensity by modifying vertical and horizontal distances.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent implements adjustable heat source positions that can be dynamically modified to optimize heating uniformity for different target materials and test conditions. The heat sources can be repositioned vertically and horizontally, providing dynamic control over heat distribution patterns while maintaining the protective offset from smoke.

Inventive Principle:

Principle #15Dynamics

3Quantity of substance

If open heat sources are used to initiate smoldering, then smoke generation is achieved, but consistency and repeatability of smoke amounts deteriorate

Engineering Contradiction:

Improvesmoke generationVSAvoidsmoke consistency

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent replaces open flame mechanical ignition sources with controlled radiant heat sources. This substitution provides precise control over heat input parameters (temperature, duration, intensity), enabling consistent and repeatable smoldering initiation and smoke generation quantities across multiple tests.

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

The apparatus ensures consistent and repeatable smoke generation, preventing heat source damage and allowing precise control over heat intensity, thereby improving the reliability of smoke detector testing by maintaining a clear path for smoke and particulate to rise without causing fires or heat source failure.

Implementation Method 1

radiant heat sources were employed to initiate smoldering in target materials

Methodology Applied

Scientific EffectRadiant heat: Thermal Radiation

Implementation Method 2

the resulting smoke and particles contacted the radiant heat sources

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Data Source

PatentUS9247584B2Heat-generating apparatus and method of generating smoke

Publication Date: 2016.01.26 UL LLC

AI summary

A heat-generating apparatus includes a frame assembly and a securement assembly carried by the frame assembly. The securement assembly includes a panel member arranged in a first vertical plane for supporting a target material parallel to the first vertical plane. The heat-generating apparatus also includes a heating support assembly adjustably supported by the frame and including at least one heating element arranged in a second vertical plane that is parallel to and offset from the first vertical plane. The heating support assembly is adjustable along a horizontal first adjustment axis that is perpendicular to each of the first and second vertical planes and along a second adjustment axis that is disposed in or adjacent to the second vertical plane.