Compact Electrode Assembly for Rotary Atomizer
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Solution Overview
Problem
Conventional electrostatic rotary atomizers with external charging have long outer electrodes that protrude significantly, limiting their use in spatially restricted environments due to increased size, which complicates their application in the automotive industry for coating objects.
Innovation Solution
The electrode arrangement features a resistance unit with a resistance track that runs perpendicular to the main axis, integrated into a carrier substrate, forming a laminate structure with a non-conductive shell, allowing for a more compact design by reducing the length of the outer electrodes and preventing high-voltage flashovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resistors are installed in outer electrodes, then damping function is achieved, but electrode length increases significantly
Solution Approach 1:
The resistance track is arranged perpendicular to the main axis on a carrier substrate, changing the dimensional orientation of the resistor from axial to radial. This allows the damping function to be achieved without increasing the axial length of the outer electrodes, resolving the contradiction between reliability and electrode length.
Solution Approach 2:
A ceramic or plastic carrier substrate is used to support the resistance track, providing a thin-film structure that integrates the resistor compactly. This substrate allows the resistance element to be positioned without adding significant length to the electrode, maintaining both damping function and compact dimensions.
2Length of moving object
If resistance track runs perpendicular to main axis, then compact design is achieved, but insulation requirements increase
Solution Approach 1:
An electrically non-conductive sleeve or shell is introduced as an intermediary component surrounding the carrier substrate and resistance track. This mediator provides the necessary insulation and creepage distance to prevent high-voltage flashovers, enabling the compact perpendicular arrangement while maintaining electrical safety.
Solution Approach 2:
The resistance device combines multiple materials with different properties: a ceramic or plastic carrier substrate for mechanical support, a resistive material for the resistance track, and an electrically non-conductive sleeve or shell for insulation. This composite structure achieves both compactness and high-voltage isolation.
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
This compact design enhances the atomizer's usability in spatially restricted areas while maintaining effective ionization of coating materials, ensuring efficient paint application and preventing voltage flashovers.
Implementation Method 1
The resistance device serves as a damping resistor and prevents rapid changes in current
Implementation Method 2
the electrode arrangement defines a principal axis around which an electric field is established
Implementation Method 3
the air lying in between is ionized. The initially neutral paint particles are charged when passing through the ionized air
Data Source
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AI summary
The invention relates to an electrode assembly for an electrostatic atomizer, in particular for an electrostatic rotary atomizer, comprising at least one outer electrode (20) and an electric resistance device (24), which has at least one resistance unit (34) that is connected via an electrode connection (36) to the at least one outer electrode (20) and can be connected via a contact connection (38) to a pole of a high-voltage source (26). The electrode assembly defines a main axis (18) around which an electric field is built up. The resistance unit (34) comprises a resistance track (40) that runs between the electrode connection (36) and the contact connection (38) and is carried by a carrier substrate (13). The invention also relates to an electrostatic atomizer having such an electrode assembly (16).