Two-Piece Spark Arrestor Design for Wood Stove Access and Safety
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Solution Overview
Problem
Existing spark arrestors for wood burning stoves and firepits are plagued by issues such as high cost, large weight, low portability, poor combustion performance, short service life, smoke generation, fire risk, and aesthetic degradation due to complex designs with seams and hinges that lead to warpage, corrosion, and inadequate airflow.
Innovation Solution
A two-piece spark arrestor design featuring a base and top assembly with mesh screens and handles made of stainless steel, allowing for removable and secure fitting onto the stove, which blocks sparks and embers while maintaining airflow and resisting deformation, thus providing improved aesthetics and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spark arrestors completely cover the top of the stove with a screen or grating, then spark blocking is improved, but access to the combustion area is limited
Solution Approach 1:
The spark arrestor is divided into a two-piece assembly with a base portion that covers the stove top and a removable lid portion. This segmentation allows the lid to be removed for access to the combustion area while the base remains in place to continue blocking sparks, thus resolving the contradiction between spark blocking and accessibility.
2Ease of operation
If hinged, multipart spark arrestors are used, then access to combustion area is improved, but device complexity and weight increase
Solution Approach 1:
The invention extracts the lid portion as a separate removable component from the base assembly, eliminating the need for hinges and complex joining mechanisms. The lid can be simply lifted off and set aside, providing access to the combustion area without adding device complexity or weight.
3Strength
If conventional spark arrestors are made with welded seams and linear joins, then structural integrity is improved, but visual appearance deteriorates and failure points increase
Solution Approach 1:
The lid and base portions are designed to mate together forming a seamless, integrated appearance when assembled. The joining interface is designed to be inconspicuous, and the removable nature allows the components to be stored together when not in use, maintaining a clean aesthetic without visible seams or joins.
4Duration of action of stationary object
If spark arrestors undergo repeated cold and high heat cycles, then service experience is improved, but bowing and sagging occur
Solution Approach 1:
The spark arrestor components are designed with flexibility to accommodate thermal expansion and contraction during repeated heating and cooling cycles. The material selection and structural design allow the components to dynamically adjust to temperature changes without permanent deformation, maintaining structural stability throughout their service life.
5Reliability
If conventional spark arrestors are designed with complex seams and hinges, then spark blocking is improved, but weight increases and portability decreases
Solution Approach 1:
The spark arrestor employs thin mesh screens and lightweight metal construction that provide effective spark blocking without excessive weight. The simplified two-piece design eliminates heavy hinges and complex joining mechanisms, achieving the required reliability with minimal weight for portability.
6Reliability
If conventional spark arrestors provide insufficient air flow, then spark blocking is improved, but combustion performance deteriorates
Solution Approach 1:
The spark arrestor design incorporates localized airflow channels and openings in strategic positions that allow sufficient air to reach the combustion area while maintaining effective spark blocking. The mesh screens and grating patterns are designed with appropriate open areas to balance spark containment with combustion air supply.
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 two-piece spark arrestor effectively limits spark escape, enhances combustion efficiency, reduces smoke production, and extends service life by being lightweight, cost-effective, and resistant to warping, while maintaining a clean aesthetic appearance.
Implementation Method 1
a mesh side screen connecting the base ring and the base crown... a mesh top screen extending from the top crown... configured to block sparks or embers produced by the stove
Data Source
AI summary
Disclosed is a stove having a top portion including a spark arrestor which includes a base assembly comprising a base ring, a base crown, a mesh side screen connecting the base ring and the base crown, and at least one handle, and a top assembly comprising a top crown, a mesh top screen extending from the top crown, and at least one handle, wherein the base assembly is sized to fit removably onto the top portion of the stove such that the base assembly is configured to block sparks or embers produced by the stove, and wherein the top assembly fits removably onto the base crown such that the top assembly is configured to block sparks or embers produced by the stove.