Electrostatic Coating Device Air Substitution for Corrosion Prevention

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In rotary atomizing-type electrostatic coating devices, ground leakage can lead to corrosion of insulating members around coating material supply/discharge paths due to ozone and nitrogen oxides formation, compromising the insulating properties and coating material integrity.

Innovation Solution

An electrostatic coating device design that includes a substitution part to replace stagnant air between coating material and washing fluid paths with new air, using blowing and exhaust ports to discharge ozone and nitrogen oxides, thereby preventing corrosion at insulating members.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high voltage is applied to the coating material supply/discharge paths for electrostatic coating, then electrostatic coating function is achieved, but ground leakage occurs towards other paths particularly washing fluid path connected to earth

Engineering Contradiction:

Improveelectrostatic coating functionVSAvoidground leakage

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

An insulating member (resin housing) is introduced as an intermediary between the coating material path and washing fluid path to prevent ground leakage. The insulating member encloses the coating material path and separates it from the grounded washing fluid path, thereby eliminating the harmful ground leakage effect while maintaining electrostatic coating function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If coupling parts connect coating material and washing fluid paths, then path connectivity is achieved, but corrosion occurs at insulating member due to ozone and nitrogen oxides from ground leakage

Engineering Contradiction:

Improvepath connectivityVSAvoidcorrosion at insulating member

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The harmful gases (ozone and nitrogen oxides) generated by ground leakage at the coupling parts are extracted and discharged through dedicated discharge ports. This prevents the accumulation of corrosive gases around the insulating member while maintaining the connectivity function of the coupling parts between coating material and washing fluid paths.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

A gas flow system is introduced to actively remove harmful gases from the coupling part region. Gas discharge ports are provided to blow away ozone and nitrogen oxides generated by ground leakage, preventing their contact with and corrosion of the insulating member, while the coupling parts maintain their connectivity function.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Ease of manufacture

If air stagnates around coupling part, then natural sealing is maintained, but ozone and nitrogen oxides accumulate and react to cause corrosion

Engineering Contradiction:

Improvenatural sealingVSAvoidozone and nitrogen oxides accumulation

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

Instead of relying on stagnant air for sealing, a controlled gas flow system is implemented. Gas discharge ports actively circulate gas to prevent the accumulation of ozone and nitrogen oxides, while maintaining the sealing function through controlled atmospheric exchange rather than complete stagnation.

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The gas discharge system operates continuously to maintain a fresh atmosphere around the coupling parts. This continuous gas flow prevents the accumulation and reaction of harmful gases, replacing stagnant air with continuously circulating clean gas to protect the insulating member from corrosion.

Inventive Principle:

Principle #20Continuity of useful action

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 effectively suppresses corrosion at insulating members by continuously replacing stagnant air with new air, reducing ozone and nitrogen oxide accumulation and maintaining the insulating properties and coating material integrity.

Implementation Method 1

ground leakage may occur towards another path arranged in the vicinity of the coating material supply/discharge paths, particularly a path connected to earth

Methodology Applied

Scientific EffectGround leakage: Conduction (electrical)

Implementation Method 2

corrosion may occur at the insulating member, etc. around the coating material supply/discharge path, due to oxygen and nitrogen in the air stagnating around the coupling part reacting to change to ozone and nitrogen oxides

Methodology Applied

Scientific EffectOzone and nitrogen oxides formation: Oxidation

Data Source

PatentUS10441961B2Electrostatic coating device

Publication Date: 2019.10.15 HONDA MOTOR CO LTD

AI summary

An electrostatic coating device that can suppress the arising of corrosion in insulating members and the like surrounding coating material supply and discharge paths because of leakage arising between the paths. An electrostatic coating device is characterized by being provided with: a body part; a head part; a linking part that links the body part and the head part; a coating material path that is a first path disposed from the body part to the head part, wherein a high-voltage is applied along with the coating material (first fluid) being fed; a washing fluid path that is a second path disposed from the body part to the head part, wherein a washing fluid (second fluid) is fed along with a connection to a ground; and a displacement part for displacing all or part of air retained between the coating material path and a washing fluid path with new air.