Tube Indicator Device with Segmented Cap for Secure Retention

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Solution Overview

Problem

Existing methods for indicating the condition of tubes in a tube and shell heat exchanger, such as colored plastic caps or plugs, face issues like limited availability, difficulty in removal, potential damage, and failure to prevent air flow convection, leading to inaccurate identification and potential hazards during maintenance.

Innovation Solution

A tube indicator device with a plug and cap system that uses O-rings for secure fit, a colored sticker for condition indication, and a mechanism to prevent accidental removal, ensuring reliable and visual tube condition monitoring without compromising air tightness or ease of use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If tapered caps or plugs are used to fit snugly inside tubes, then they are securely held in place and prevent accidental dislodgement, but they become very difficult to remove and may damage the tube or cap when pried with a screwdriver

Engineering Contradiction:

Improvesecurity of cap retentionVSAvoidease of cap removal

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The cap is divided into two functional parts: a tapered seating surface that provides secure retention when installed, and a perpendicular top surface with a flat top that allows easy removal. The tapered portion engages with the tube to prevent dislodgement, while the perpendicular top portion with flat surface allows tool engagement for simple removal without damaging the tube or cap.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of making the entire cap tapered for secure fit, the invention inverts the approach by making only the seating portion tapered while the top portion is perpendicular with a flat surface. This reversal allows the cap to be both securely retained and easily removed, solving the contradiction between retention security and removal ease.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If caps or plugs are removed and reinserted multiple times, then they can be reused for different tube conditions, but they become cut or damaged by tools and no longer fit snugly, making them prone to accidental dislodgement

Engineering Contradiction:

Improvereusability of caps for different conditionsVSAvoidsnug fit retention

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The cap design inverts the traditional tapered shape, making the top surface perpendicular with a flat top instead of tapered. This prevents tool blades from cutting into the cap during removal and reinsertion operations, allowing the cap to be reused multiple times without damage while maintaining its snug fit capability.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The cap is designed as a durable, reusable component that can withstand multiple installation and removal cycles without degradation. The flat-top design prevents tool damage, and the tapered seating ensures consistent snug fit throughout the cap's service life, eliminating the need for frequent replacement.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Loss of information

If colored plastic caps are used to identify tube conditions, then visual identification of tube status is achieved, but the caps may be accidentally kicked out or dislodged during maintenance operations

Engineering Contradiction:

Improvevisual identification of tube conditionVSAvoidaccidental dislodgement prevention

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The cap design segments the retention function from the identification function. The tapered seating portion provides secure retention to prevent accidental dislodgement, while the perpendicular top with flat surface and colored markings provides visual identification. This segmentation ensures both reliability and information visibility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

By inverting the cap shape to have a perpendicular top with flat surface instead of a tapered top, the design prevents accidental dislodgement while maintaining visual identification capabilities through colored markings on the stable top surface.

Inventive Principle:

Principle #13The other way round (Inversion)

4Reliability

If tight-fitting tapered caps are used in custom-sized reactor tubes, then secure retention is achieved, but custom sizes must be manufactured and they are difficult to remove

Engineering Contradiction:

Improvesecure retention in custom tubesVSAvoidcustom size manufacturing

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The cap design segments the size-adaptation function into a separate adjustable component. The main cap body can be manufactured in standard sizes, while the retention mechanism uses an adjustable element that can be configured for different tube diameters, reducing the need for custom-manufactured caps for each tube size.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8063778B2Device and method for indicating the condition of tubes on a tubesheet

Publication Date: 2011.11.22 TUBEMASTER INC

AI summary

A device and method for temporarily plugging and visually identifying the condition of tubes.