Vent Plug Structure for Electrocoating Isolation and Pressure Relief

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Solution Overview

Problem

Conventional methods for preventing internal surfaces of parts from being coated during electrocoating processes are either ineffective, expensive, or labor-intensive, and fail to adequately vent air pressure during the curing process, leading to issues like rubber plug failure and high fabrication costs.

Innovation Solution

A vent plug design featuring a plug with a bore and vent hole, a stem with a cap and collar, and a resilient material for forming an airtight seal, which isolates internal surfaces from the coating solution and vents air pressure during curing by utilizing a sealing surface and collar configuration to maintain the plug in place.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional rubber plugs are used to isolate internal surfaces, then the internal surfaces are protected from coating, but the plugs fail during curing due to air pressure buildup

Engineering Contradiction:

Improveplug reliabilityVSAvoidplug structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The plug is segmented into multiple functional components: a body portion for sealing, a stem for structural support, a collar for retention, and a vent hole for pressure relief. This segmentation allows each component to address specific problems independently, improving overall reliability without excessive complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The vent hole acts as an intermediary element that mediates between the sealed internal environment and the external atmosphere, allowing controlled pressure equalization. This intermediary feature prevents plug failure while maintaining the sealing function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If mechanical fasteners are used to secure rubber plugs, then the plugs remain in place during curing, but the fasteners cut the rubber plugs causing failure

Engineering Contradiction:

Improveplug retentionVSAvoidmanufacturing complexity and cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The plug design is self-retaining through the collar portion that engages with the opening, eliminating the need for separate mechanical fasteners. The structure serves itself by incorporating retention features directly into the plug body, improving ease of manufacture while maintaining reliability.

Inventive Principle:

Principle #25Self-service

3Reliability

If specialized masks are fabricated to isolate internal surfaces, then air pressure is vented and plugs are retained, but the masks are expensive and difficult to insert

Engineering Contradiction:

Improveisolation effectivenessVSAvoidfabrication cost and insertion difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The plug utilizes material resiliency and geometric parameter optimization to achieve effective isolation. By changing the physical parameters of a simple rubber component rather than fabricating complex specialized masks, the design reduces fabrication cost and insertion difficulty while maintaining isolation effectiveness.

Inventive Principle:

Principle #35Parameter changes

4Reliability

If rubber plugs are used without vent holes, then internal surfaces are sealed, but air pressure builds up causing plug failure

Engineering Contradiction:

Improvesealing effectivenessVSAvoidair pressure buildup

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The vent hole converts the harmful effect of air pressure buildup into a beneficial pressure equalization mechanism. By intentionally providing a controlled vent path, the design transforms the potential failure mode into a feature that maintains sealing effectiveness while preventing damage.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 vent plug effectively prevents internal surfaces from being coated during electrocoating and vents air pressure without the need for expensive specialized masks or mechanical fasteners, ensuring a reliable and cost-effective process.

Implementation Method 1

The resilient material may be compressed as the stem is inserted through the bore, thereby forming an airtight seal between the outer surface of the stem and the inner surface of the bore

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

venting air pressure within the part which may be accumulated therein during a curing process

Methodology Applied

Scientific EffectPressure equalization: Pressure Gradient

Data Source

PatentUS11674610B2Vent plug and method

Publication Date: 2023.06.13 CUSTOM FABTING & SUPPLIES

AI summary

A vent plug and method are provide for isolating a feature of a part. The vent plug includes a plug receivable in an opening in the part to form an airtight seal between the plug and the surface of the part. A stem is receivable in a bore through the plug. The stem includes a cap and a collar. The cap has a sealing surface extending radially from an outer surface of the stem and engageable with a first surface of the plug such that sealing surface overlaps a vent hole extending through the plug. The collar extends radially from the outer surface of the stem and captures the plug between the collar and the cap.