Gas Burner Assembly with Fixed-Speed Fan for Quiet High Output
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Solution Overview
Problem
Existing gas burners with fans are noisy, costly, and inefficient, particularly at low output settings, due to the need for variable speed fans and dual outlet control valves.
Innovation Solution
A gas burner assembly with separate fuel chambers and fixed-speed fans, where the fan only operates at high heat outputs, utilizing natural aspiration at lower outputs and a single outlet valve, reducing noise and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a fan is added to increase air flow into the fuel chamber, then the gas burner energy output is improved, but the device becomes noisy
Solution Approach 1:
The patent employs a variable speed fan that dynamically adjusts its operation based on the gas input level. The control system activates the fan only when high gas flow is detected, allowing the burner to achieve high power output when needed while remaining quiet during normal operation. This dynamic control resolves the contradiction by making the noise-generating component operational only when its function is actually required.
Solution Approach 2:
The system changes the operational parameters of the fan based on the burning conditions. By monitoring gas flow rate and adjusting fan speed accordingly, the system maintains optimal fuel-air mixture at different power levels. This parameter adjustment allows the burner to switch between natural aspiration (quiet) and forced aeration (noisy but high-performance) modes as needed.
2Reliability
If a variable speed fan is used to maintain proper fuel/air mixture throughout the operating range, then the combustion efficiency is improved, but the device complexity and cost increase
Solution Approach 1:
The control system automatically detects gas input levels and activates the fan only when high gas flow is present. This self-regulating mechanism eliminates the need for complex manual control systems while maintaining proper fuel-air mixture. The system serves itself by using the gas flow characteristics to trigger fan operation, reducing overall system complexity.
Solution Approach 2:
The patent extracts the fan function from continuous operation and makes it conditional. By removing the fan from the always-on configuration and activating it only when specifically needed (high gas input), the system reduces the operational complexity of the control mechanism while maintaining combustion efficiency when required.
3Power
If a high volume flow rate of fuel/air mixture is used, then the gas burner output is improved, but the ability to operate efficiently at low volume flow rate is limited
Solution Approach 1:
The system dynamically switches between two operational modes: natural aspiration for low to medium outputs and forced aeration with fan for high outputs. This dynamic mode switching allows the burner to adapt to different cooking requirements efficiently, maintaining optimal performance across the entire operating range without being locked into a single flow rate configuration.
Solution Approach 2:
The operating range is segmented into different zones (low/medium and high output) with different air supply mechanisms optimized for each. The first plurality of flame ports operates independently via natural aspiration, while the second plurality activates with fan-assisted forced aeration. This segmentation allows each zone to operate at its optimal efficiency point.
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 solution provides quiet operation across most of the burner's range, eliminates the need for variable speed fans, and reduces costs by using a single outlet valve, while maintaining efficient fuel-air mixing.
Implementation Method 1
A fan is coupled to the gas burner assembly such that the fan is operable to urge a flow of air into only the second fuel chamber
Implementation Method 2
Between the orifice and the fuel chamber, the gaseous fuel entrains air, and the gaseous fuel and air mix within the fuel chamber
Implementation Method 3
The first plurality of flame ports is naturally aspirated
Data Source
AI summary
A cooktop appliance includes a gas burner assembly with one or more burner bodies that define a first plurality of flame ports, a first fuel chamber, a second plurality of flame ports and a second fuel chamber. A fan is coupled to the gas burner assembly such that the fan is operable to urge a flow of air into only the second fuel chamber. An operating speed of the fan is fixed such that a firing rate of the second plurality of flame ports is fixed.