Electrostatic Coating Cover Member Insulation Design
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Solution Overview
Problem
Conventional electrostatic coating apparatuses face issues with paint deposition on insulating cover members, leading to degradation of insulating performance and frequent interruptions, as well as instability and low yield in water repellent paint coatings.
Innovation Solution
The electrostatic coating apparatus features a cover member with a spacing between the housing and cover members to prevent high voltage electrostatic charge leakage, using fluorine-base synthetic resin or polyethylene resin films for water repellency and stability, and laminated films with semi-conducting layers to uniformly distribute electrostatic charges and prevent paint deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a water repellent paint is coated on the cover member to prevent paint deposition, then paint deposition is initially prevented, but the coating thickness decreases over time due to repeated washing, requiring periodic re-coating and causing instability in quality
Solution Approach 1:
The invention changes the fundamental parameter of the cover member material from conventional insulating materials to fluorine-base synthetic resin or polyethylene resin films. These materials inherently possess water repellent properties and high insulating performance without requiring additional protective coatings. The material parameter change eliminates the need for periodic re-coating while maintaining stable quality and preventing paint deposition throughout the device's service life.
Solution Approach 2:
The invention employs composite material structures, specifically laminated films combining fluorine-base synthetic resin or polyethylene resin with other materials. This composite approach provides both water repellency and electrical insulation in a single integrated structure, eliminating the need for separate water repellent paint coatings and their associated maintenance requirements.
2Loss of energy
If the cover member is made of electrically insulating material to prevent charge leakage, then high voltage charges are maintained on the cover member, but paint particles deposit on the cover member over time, degrading insulating performance
Solution Approach 1:
The invention changes the material parameter of the cover member to fluorine-base synthetic resin or polyethylene resin, which possess both high electrical insulation properties and inherent water repellency. This parameter change allows the cover member to simultaneously retain electrostatic charges effectively while preventing paint particle deposition that would otherwise degrade insulating performance over time.
3Productivity
If coating operations are continued without interruption, then productivity is maintained, but paint deposits accumulate on the cover member, requiring frequent interruptions for maintenance
Solution Approach 1:
The invention changes the cover member material to fluorine-base synthetic resin or polyethylene resin with inherent water repellent properties. This material parameter change prevents paint deposition throughout extended operation periods, allowing coating operations to continue without frequent interruptions for maintenance, thereby maximizing productivity and minimizing downtime.
4Loss of energy
If a spacing is provided between housing and cover members, then electrostatic charge leakage is prevented, but the structural complexity increases
Solution Approach 1:
The invention changes the material parameter of the cover member to fluorine-base synthetic resin or polyethylene resin, which inherently prevent electrostatic charge leakage due to their high insulation properties. This material parameter change eliminates the need for complex spacing structures, as the material itself provides the necessary electrical isolation, thereby reducing structural complexity while maintaining charge leakage prevention.
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 solution maintains a stable electrostatic charge on the cover member, preventing paint deposition and reducing maintenance frequency, while ensuring high productivity and quality by uniformly distributing electrostatic charges and preventing localized paint accumulation.
Implementation Method 1
a high voltage application means adapted to electrify sprayed paint particles from the paint atomizing means with a high voltage electrostatic charge, urging charged paint particles to fly toward and deposit on the work piece
Implementation Method 2
an electrostatic field is formed by lines of electric force between an external electrode, to which a negative high voltage is applied, and a rotary atomizing head which is held at the earth potential, and between the external electrode and a work piece
Implementation Method 3
a negative ionization zone is formed in the vicinity of a fore distal end of the external electrode assembly. sprayed paint particles are electrified by application of a negative high voltage during travel through the ionization zone to become negatively charged paint particles
Implementation Method 4
a negative ionization zone is formed in the vicinity of a fore distal end of the external electrode assembly
Implementation Method 5
the cover member which is formed of an electrically insulating material can prevent high voltage electrostatic charges on its outer surfaces from leaking to the side of the earth potential
Implementation Method 6
the cover member is formed of a fluorine-base synthetic resin film or a polyethylene resin film
Data Source
AI summary
An atomizer including an air motor and a rotary atomizing head, mounted in a front side of a housing member, while a high voltage generator applying a high voltage to paint through the air motor is mounted in a rear side of the housing member. A cover member is fitted on the housing member to cover an outer surface of the housing member. Opposite axial ends of the cover member are fitted on and attached to opposite axial ends of the housing member so as to leave an annular gap space between the cover member and the housing member. The annular gap space keeps almost entire radially confront areas of the cover member and the housing member, preventing high voltage electrostatic charges on the outer surfaces of the cover member from leaking through the housing member.