Multi-Ring Gas Burner Cross-Lighting Duct for Reliable Flame Transfer

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Solution Overview

Problem

Multi-ring gas burners face issues with unsightly flames at high flow rates, expensive secondary machining for carryover slots, debris entry and cleaning difficulties, and flame imbalance in carryover ducts leading to inefficient fuel and air mixture, resulting in flame quenching and large, undesirably flame production.

Innovation Solution

A multi-ring gas burner design featuring a cross-lighting duct with a fuel delivery aperture at the bottom, directing gaseous fuel from a fuel chamber into the duct, and a cap positioned over flame ports to stabilize flames, ensuring reliable flame transfer across a range of flow rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If carryover slots are used to transfer flames between burner rings, then flame transfer is achieved, but flames become unsightly at high flow rates and debris entry is facilitated

Engineering Contradiction:

Improveflame transfer reliabilityVSAvoidunsightly flames and debris entry

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention extracts the flame transfer function from the traditional carryover slot location (top surface) and relocates it to the bottom portion of the burner through the fuel delivery aperture. This separation removes the harmful effects (unsightly flames, debris entry) from the flame transfer mechanism while preserving the essential function of igniting adjacent burner rings.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention inverts the conventional approach by positioning the fuel delivery aperture at the bottom portion of the burner instead of at the top where carryover slots are traditionally located. This inversion allows flames to travel upward along the bottom surface, achieving reliable flame transfer while preventing debris entry and eliminating unsightly high flames at the top surface.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If carryover ducts are used to transfer flames, then flame transfer can be achieved, but flame quenching occurs at the top and large volumes of fuel are needed

Engineering Contradiction:

Improveflame transfer capabilityVSAvoidfuel consumption and flame quenching

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The invention extracts the fuel delivery function from the top portion of the burner where flame quenching occurs and relocates it to the bottom portion through the fuel delivery aperture. This allows fuel to be delivered where flames can establish themselves without immediate quenching, reducing the fuel volume needed while maintaining reliable flame transfer.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If carryover slots are machined on cast or forged components, then flame transfer is achieved, but secondary machining processes increase manufacturing cost

Engineering Contradiction:

Improveflame transfer functionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention merges the fuel delivery function and the flame transfer function into a single integrated feature (the fuel delivery aperture at the bottom portion). This eliminates the need for separate carryover slots and their associated secondary machining operations, reducing manufacturing complexity and cost while maintaining effective flame transfer.

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If fuel and air mixture in carryover duct is imbalanced, then flame transfer fails, but achieving suitable fuel to air ratio over wide flow rates is difficult

Engineering Contradiction:

Improveflame transfer consistencyVSAvoidfuel to air mixture control

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention enables the fuel delivery aperture to self-regulate the fuel to air mixture by positioning it at the bottom portion where natural convection and flame propagation automatically balance fuel and air intake. This eliminates the need for complex control mechanisms to maintain proper mixture ratios across varying flow rates, ensuring consistent flame transfer through self-adjusting combustion dynamics.

Inventive Principle:

Principle #25Self-service

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 effectively stabilizes flames and ensures reliable flame transfer between burner rings across varying flow rates, reducing flame quenching and debris entry, while minimizing the need for excessive fuel, thus producing a more efficient and cleaner burn.

Implementation Method 1

The fuel delivery aperture is configured for directing gaseous fuel from a fuel chamber of the outer burner ring into the cross-lighting duct

Methodology Applied

Scientific EffectFuel delivery and gas flow:

Implementation Method 2

utilize carryover slots or ducts along the top surface of one of the burner rings to carry flames and ignite gaseous fuel at other burner rings

Methodology Applied

Scientific EffectFlame transfer and combustion propagation: Combustion

Data Source

PatentUS9677768B2Multi-ring gas burner

Publication Date: 2017.06.13 HAIER US APPLIANCE SOLUTIONS INC

AI summary

A multi-ring gas burner includes an outer burner ring that extends around an inner burner. The outer burner ring has a cross-lighting duct with a fuel delivery aperture positioned at a bottom portion of the cross-lighting duct. The fuel delivery aperture is configured for directing gaseous fuel from a fuel chamber of the outer burner ring into the cross-lighting duct.