Fire Pit Double-Wall Airflow Design to Reduce Smoke Production
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Solution Overview
Problem
Backyard campfires, especially those using soft wood or wood with water, generate excessive smoke, which can infiltrate homes and neighboring properties, leading to bans in some areas, and pose challenges in positioning grills correctly for cooking. Existing fire pits with airflow chambers do not fully address smoke reduction and grill placement issues.
Innovation Solution
A fire pit design with a double outer wall defining an air inlet, an accessory support post locking mechanism, and a post holder for securing the accessory post in the ground, allowing for improved airflow and grill positioning without the need for additional tools, while the air inlet channels and legs enhance smoke reduction and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fire pit is used to contain camp fires, then smoke infiltration into houses is reduced, but the ability to position grills at the proper location above flames is compromised
Solution Approach 1:
The fire containment system is divided into separate functional components: a fire pit for containing flames and a removable accessory support post for positioning grills. This segmentation allows the fire pit to focus on smoke containment while the support post handles grill positioning, resolving the contradiction between smoke reduction and operational ease.
Solution Approach 2:
An accessory support post serves as an intermediary element between the fire pit and the grill. This mediator allows the grill to be positioned at the proper height and location above the flames without compromising the fire pit's smoke containment structure, thus resolving the positioning issue while maintaining smoke reduction benefits.
2Reliability
If a locking mechanism is added to secure the accessory post, then the post is locked in vertical and rotational position, but the device complexity increases
Solution Approach 1:
The locking function is extracted as a separate, simple mechanism rather than being integrated into the main post structure. The locking projection and flange work independently to provide stabilization, reducing overall device complexity while maintaining reliability.
Solution Approach 2:
The locking mechanism is designed to be self-actuating through simple rotational movement of the accessory post. The locking projection automatically engages with the locking flange when the post is rotated to the correct position, eliminating the need for additional controls or complex actuation systems.
3Object-generated harmful factors
If air inlet channels are provided in the bottom of the main body, then smoke production is reduced through efficient airflow, but the device complexity increases
Solution Approach 1:
The air inlet channels are merged with the bottom wall structure of the fire pit body, integrating the smoke reduction function into the existing structural design. This combination eliminates the need for separate, complex air inlet components while achieving efficient airflow for smoke reduction.
Solution Approach 2:
The bottom wall of the fire pit serves multiple functions: it provides structural support and simultaneously houses the air inlet channels for smoke reduction. This multi-functionality reduces overall device complexity by combining structural and airflow management roles in a single component.
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 fire pit design significantly reduces smoke production by providing efficient airflow and allows for secure, versatile grill placement over campfires, addressing both smoke and cooking positioning issues, thus enhancing outdoor cooking experiences.
Implementation Method 1
an airflow chamber between the exterior walls of the main body wherein air is heated before being introduced at the top of the burn box
Implementation Method 2
air is heated before being introduced at the top of the burn box. This helps to reduce smoke produced by the fire
Data Source
AI summary
A fire pit includes a main body having a double outer wall that defines an air inlet. An accessory support post is received by the main body within the double outer wall. A locking projection and locking flange cooperate to lock the vertical and rotational position of the support post with respect to the main body of the fire pit. A floating fire box is supported from above by a grilling flange that allows the fire box to move down when heated. The accessory post can be used with a post holder next to a camp fire. The post holder and accessory post use of the locking projection and locking flange to secure the accessory post with respect to the holder. A grill having an outer body member protects the user's finger from engaging sharp edges of an expanded metal grill.