Electrostatic Atomizing Rotary Head for Paint Coating
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Solution Overview
Problem
Rotary atomizing coating apparatuses face inefficiencies due to paint particles being raised by shaping air flow, leading to decreased coating efficiency, and increasing rotation speed without shaping air does not adequately atomize paint to suitable particle diameters for application.
Innovation Solution
An electrostatic atomizing coating apparatus with a rotary head having grooves and an outer ring, utilizing a high voltage generator to create an electrostatic field that atomizes paint without shaping air, controlling voltage to stabilize particle diameter and intensity, and using ion wind for efficient paint application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If shaping air is used in rotary atomizing coating apparatus, then paint atomization is achieved, but paint particles are raised up by accompanied flow causing decreased coating efficiency
Solution Approach 1:
The invention extracts and eliminates the shaping air flow from the coating system, replacing it with an electrostatic field generated by a high voltage generator. The rotary head with grooves atomizes paint through centrifugal force alone, and the electrostatic field directs the atomized particles to the coating target without the harmful accompanied flow that causes paint particles to rise up and reduces coating efficiency.
Solution Approach 2:
The invention replaces the mechanical pneumatic atomization system (using shaping air flow) with an electrostatic field-based system. The high voltage generator creates an electrostatic field that acts on the atomized paint particles, substituting the mechanical air flow mechanism with an electrical field mechanism that achieves particle direction and control without the harmful effects of accompanied flow.
2Force
If rotation speed of rotary head is increased without shaping air, then centrifugal force increases, but paint cannot be atomized sufficiently to suitable particle diameter
Solution Approach 1:
The invention merges two atomization mechanisms: centrifugal force from the rotating grooved head and electrostatic field action from the high voltage generator. The centrifugal force initial atomization is enhanced and controlled by the electrostatic field, which further breaks down paint particles into suitable diameters and directs them precisely to the coating target, achieving sufficient atomization without excessive rotation speed.
Solution Approach 2:
The invention changes the physical parameters of the atomization process by introducing high voltage electrostatic field parameters alongside centrifugal force parameters. By controlling the voltage output and electrostatic field intensity, the system achieves optimal paint particle diameter control without relying solely on increasing rotation speed, thus maintaining manageable centrifugal force while achieving sufficient atomization.
3Power
If voltage output from generator is increased, then electrostatic field intensity increases and atomization improves, but particle diameter control becomes challenging
Solution Approach 1:
The invention incorporates a control unit that provides feedback control of the voltage output from the high voltage generator. The control unit monitors the electrostatic field intensity and adjusts the voltage output to maintain optimal atomization conditions and consistent particle diameter. This feedback mechanism prevents over-atomization or excessive field intensity that would cause particle diameter variations, ensuring precise control throughout the coating process.
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 approach stabilizes paint atomization and significantly improves coating efficiency by preventing paint particles from being raised by air flow and ensures suitable particle diameters for application, enhancing the coating process without the need for shaping air.
Implementation Method 1
a generator configured to provide a voltage to the at least one rotary head so as to form an electrostatic field between the open end and a grounded coating target and electrostatically atomize the thread-shaped paint discharged from the open end
Implementation Method 2
carry the paint thus electrostatically atomized to the coating target on an ion wind generated by a glow discharge
Data Source
AI summary
An electrostatic atomizing coating apparatus and method incorporate a rotary head having a base portion, an open end and a plurality of grooves formed radially on an inner peripheral surface of the open end, an inside diameter of the rotary head increasing from the base portion toward the open end, and a motor configured to rotate the rotary head to discharge a thread-shaped paint. A voltage is applied to the rotary head so as to form an electrostatic field between the open end of the rotary head and an earthed coating target and to electrostatically atomize the thread-shaped paint discharged from the open end. Voltage output from the generator is controlled so as to adjust an intensity of the electrostatic field and to control a particle diameter of the electrostatically atomized thread-shaped paint.