Dielectric Barrier Discharge Lamp Retaining Disk Centering
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Solution Overview
Problem
Dielectric barrier discharge lamps face issues with maintaining a constant arcing distance between electrodes, particularly in long lamps, where the inner electrode or tube can sag, leading to potential damage during transport or operation, and existing fastening methods like spot-welding are ineffective in preventing mechanical stress and deformation of the quartz glass discharge vessel.
Innovation Solution
A retaining disk with two supporting means, applied as material beads on the inner tube, is loosely secured on both sides to prevent sliding and minimize stress transfer, ensuring the inner electrode remains centered without rigidly fixing it to the discharge vessel, using a specific distance relationship between the beads and the disk thickness to maintain loose mounting and prevent thermal sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the inner electrode or inner tube is rigidly fixed to the discharge vessel to prevent sagging, then the mechanical stability is improved, but the risk of stress concentration and breakage increases
Solution Approach 1:
The patent applies cushioning elements in the form of beads made from elastic material (such as PTFE) that are arranged between the retaining disk and the discharge vessel. These beads act as stress-absorbing cushions that prevent direct rigid contact, thereby cushioning against mechanical stresses and preventing breakage while maintaining the inner electrode's centered position.
2Object-affected harmful factors
If the retaining disk is loosely supported on both sides by supporting means, then the stress transfer to the discharge vessel is minimized, but the prevention of sliding along the longitudinal axis must be ensured
Solution Approach 1:
The retaining arrangement is segmented into multiple components: the retaining disk, supporting means (beads), and fixing means (welds). The supporting means are distributed at multiple locations around the circumference, creating discrete support points that collectively prevent sliding while minimizing stress. This segmentation allows the system to achieve both stability and stress reduction.
Solution Approach 2:
The supporting means (beads) act as intermediaries between the retaining disk and the discharge vessel. These beads provide a mediating interface that prevents direct rigid contact, allowing the retaining disk to be held in position without transferring harmful stresses to the discharge vessel. The beads deform elastically to accommodate minor misalignments while maintaining the centered position.
Data Source
AI summary
A dielectric barrier discharge lamp (1) with a discharge vessel, which has an outer tube (2), which surrounds a discharge space (4) filled with a discharge medium, an outer electrode (6), which is arranged on the outer side of the outer tube (2), an elongate inner electrode (7), which is arranged axially within the outer tube (2), at least one retaining disk (8) with an axial bore, through which the elongate inner electrode (7) runs, the retaining disk (8) extending substantially from the inner electrode (7) up to the inner side of the outer tube (2), as a result of which the inner electrode (7) is centered at least indirectly within the discharge vessel. The retaining disk (8) is supported on both sides loosely in the direction of the longitudinal axis by means of a supporting means (9a-9c) on the left-hand side and a supporting means (10a-10c) on the right-hand side.