Electrode Assembly for Electrostatic Atomizer with Dielectric Field Control
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Solution Overview
Problem
Existing electrostatic atomizers with external charging concepts face challenges in coating narrow surfaces and complex potential separation, especially with conductive paints, and are difficult to clean due to their compact design and requirement for multiple electrodes.
Innovation Solution
An electrode arrangement with a dielectric material influences discharge currents to create an efficient electrostatic field, allowing for both internal and external coating of workpieces, reducing electrode size, and enabling easy cleaning by minimizing parasitic discharges and using modular, telescopically adjustable electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external electrodes are used to generate electrostatic field for coating, then charging effectiveness is improved, but device size increases making it difficult to access narrow surfaces
Solution Approach 1:
The electrode is integrated within the atomizer housing structure, with the electrode ring nested within the housing and the dielectric material positioned between the electrode and housing wall. This nested arrangement allows the electrostatic field generating components to be contained within the compact atomizer volume, enabling access to narrow surfaces while maintaining charging effectiveness.
Solution Approach 2:
The electrode is arranged as a ring structure extending in the axial direction, utilizing the third dimension (axial length) to distribute the electrostatic field generation along the spray axis. This dimensional arrangement allows effective charging without requiring large radial dimensions, keeping the atomizer compact for accessing narrow spaces.
2Reliability
If multiple outer electrode fingers are used for external charging, then charging coverage is improved, but cleaning difficulty increases due to individual cleaning requirements
Solution Approach 1:
Multiple electrode fingers are merged into a single continuous electrode ring structure. This unified design allows the entire electrode assembly to be cleaned as one component by removing and washing the electrode ring, eliminating the need to individually clean multiple separate fingers while maintaining comprehensive charging coverage.
Solution Approach 2:
The electrode ring serves multiple functions: it generates the electrostatic field for charging paint droplets, and its removable design enables it to function as a detachable cleaning component. The same structure that provides charging coverage also facilitates easy maintenance through removal and cleaning.
3Volume of moving object
If compact atomizer design is used, then accessibility to narrow areas is improved, but potential isolation complexity increases for conductive coatings
Solution Approach 1:
A dielectric material is introduced as an intermediary between the electrode and the atomizer housing wall. This dielectric layer provides electrical isolation for conductive coatings, preventing unwanted discharge paths through the housing while maintaining the compact atomizer design. The dielectric material acts as a mediator that enables compactness without compromising electrical isolation requirements.
4Volume of moving object
If electrode size is reduced for better access, then accessibility to narrow surfaces is improved, but electrostatic field generation effectiveness may deteriorate
Solution Approach 1:
The electrode transitions from a planar or radial configuration to a ring structure extending in the axial dimension. By distributing the electrode surface area along the axial direction rather than relying solely on radial extent, the electrode maintains effective field generation capability while keeping radial dimensions small for accessibility to narrow surfaces.
Solution Approach 2:
The combination of conductive electrode material with dielectric material creates a composite structure where the electrode ring generates the electrostatic field while the dielectric material directs and shapes the field distribution. This composite arrangement enhances field generation effectiveness within the constrained dimensions required for accessing narrow surfaces.
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 enables efficient internal and external coating of workpieces, reduces electrode size for better access to narrow areas, and simplifies cleaning by minimizing parasitic discharges and allowing the use of low-resistance paints, while maintaining effective charging of the coating agent.
Implementation Method 1
wherein there is provided at least one dielectric material for influencing a discharge current component of a discharge current extending in the direction of the axis of symmetry
Implementation Method 2
at least one electrode for generating an electrostatic field around an axis of symmetry
Implementation Method 3
The paint droplets are thus charged by ion attachment and transported to the workpiece
Data Source
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AI summary
The invention relates to an electrode assembly for an electrostatic atomizer, in particular for a rotation atomizer, having an electrode holder arrangement (101) for holding at least one electrode (108) creating an electrostatic field about a symmetrical axis (105), wherein there is a dielectric material for influencing a discharge current component extending in the direction of the symmetrical axis.