Burner Assembly Glow Plug Mounting for Evaporator Deformation
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Solution Overview
Problem
Conventional burner assemblies for mobile heating devices face issues such as increased length, complex assembly processes, and reduced service life due to rigid fixation of the glow plug, which leads to material fatigue and inoperability from contact with the evaporator.
Innovation Solution
A burner assembly design that replaces conventional bushings with a holder arrangement allowing pivotability and linear movability of the glow plug, using a holder element and spring element to maintain optimal positioning relative to the evaporator, reducing contact and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid plug socket is used to fix the glow plug in a predefined position, then the glow plug is securely positioned close to the evaporator for efficient heat supply, but the evaporator must be locally interrupted and the assembly complexity increases
Solution Approach 1:
The patent replaces the rigid plug socket with a dynamic holder arrangement that allows the glow plug to pivot and move linearly. The holder element with opening and spring element enables the glow plug to adapt its position dynamically, eliminating the need for evaporator interruption while maintaining secure positioning through flexible constraint rather than rigid fixation.
Solution Approach 2:
The holder arrangement is segmented into distinct functional elements: a holder element with an opening for radial mounting, a spring element for axial positioning, and the glow plug itself. This segmentation allows each component to perform its specific function independently, simplifying the overall assembly process and eliminating the complex integrated plug socket design.
2Stability of the object's composition
If a rigid plug socket is used to fix the glow plug, then the glow plug maintains a fixed position, but material fatigue occurs and service life is reduced due to contact with the evaporator
Solution Approach 1:
The holder arrangement transforms the static, rigid connection into a dynamic, flexible connection. The spring element provides axial movability allowing the glow plug to move toward or away from the evaporator, while the opening in the holder element allows radial pivoting. This dynamic capability prevents material fatigue by accommodating thermal expansion and mechanical stress, thereby extending service life while maintaining stable operational positioning.
Solution Approach 2:
The patent changes the positional parameters of the glow plug from fixed to variable. The spring element enables axial position adjustment, and the holder element's opening permits angular orientation adjustment. These parameter changes allow the system to adapt to varying operational conditions, preventing the material fatigue that results from rigid, unadjustable positioning.
3Ease of operation
If the plug socket is arranged laterally with respect to the evaporator receptacle, then the glow plug can be mounted radially, but the axial length of the evaporator receptacle is increased
Solution Approach 1:
The patent resolves the spatial conflict by utilizing multiple dimensions for glow plug mounting. The holder element is mounted radially on the circumferential wall (providing radial access), while the spring element provides axial positioning capability. This multi-dimensional approach allows radial mounting ease while maintaining compact axial dimensions, as the holder element extends into the combustion chamber rather than increasing the evaporator receptacle's axial length.
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
Enhances the service life of the burner assembly by accommodating evaporator deformations, simplifies assembly, and reduces production costs by eliminating the need for complex bushings.
Implementation Method 1
a spring element (8) which is operatively connected to the glow plug (10) and which is configured to apply a spring force (Fs) to the shaft section (12), in particular to press the shaft section (12) in the direction (R) towards the evaporator (20)
Implementation Method 2
the structure of the evaporator used has a multiplicity of cavities, such that the liquid fuel is absorbed by the evaporator by a capillary action and fuel is passed through the evaporator
Data Source
AI summary
Burner assembly (1) for a mobile fuel-operated heating device, in particular for a vehicle, comprises an evaporator (20) which is configured to evaporate a fuel supplied to it, an evaporator receptacle (24) which is configured to receive the evaporator (20), a circumferential wall (16) which defines a combustion chamber (14) in which a gas mixture containing the evaporated fuel may be combusted, wherein the circumferential wall (16) defines a central axis (M), a glow plug (10) with a shaft section (12) comprising a glow element, which is configured to convert a current flowing through it, when a voltage is applied, into heat for igniting the gas mixture, and a first opening (15) which is formed in the circumferential wall (16) of the combustion chamber (14) and through which the shaft section (12) of the glow plug (10) extends substantially radially into the combustion chamber (14). A holder arrangement (44, 45, 46, 17, 8) for the glow plug (10) is configured to allow a pivotability of the shaft section (12) of the glow plug (10) within the combustion chamber (14) in a direction (R) along the central axis (M) away from the evaporator (20). A corresponding insert component with an integrally formed retaining ring for the evaporator is also provided.