Skid Pipe Insulation Sleeve With Density Gradient Against Brittleness

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Solution Overview

Problem

Existing heat insulating materials for skid pipes in reheating furnaces are economically impractical, lack physical strength, and are susceptible to damage from contact and temperature changes, leading to brittleness and insufficient protection.

Innovation Solution

A hollow cylindrical heat insulating protective member made from an inorganic fiber formed body with increasing bulk density and inorganic binder content towards the outer surface, enhancing stiffness while maintaining cushioning properties, and a method for installing it on skid pipes with a pin insertion and inorganic fiber filler to prevent damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If inorganic fiber aggregates are used as protective members, then heat insulation properties are improved, but physical strength is insufficient and the material becomes brittle due to scale corrosion and temperature changes

Engineering Contradiction:

Improveheat insulation propertiesVSAvoidphysical strength

Core Design Contradiction:

TemperatureVSStrength

Solution Approach 1:

The patent applies local quality by creating a gradient structure where the bulk density of the inorganic fiber formed body increases from the inner circumferential surface toward the outer circumferential surface. This means the outer layer has higher density and strength to resist mechanical damage and scale corrosion, while the inner layer maintains lower density for optimal heat insulation properties. This spatial variation in material properties resolves the contradiction between heat insulation and physical strength.

Inventive Principle:

Principle #3Local quality

2Temperature

If ring-shaped heat insulating materials are used, then heat insulation is provided, but the material may be damaged due to contact when people move around in the furnace

Engineering Contradiction:

Improveheat insulationVSAvoidresistance to contact damage

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent enhances reliability against contact damage by concentrating the high-density, high-strength inorganic binder material at the outer circumferential surface that is exposed to potential contact. The gradient structure ensures that the contact-prone outer surface has superior mechanical properties while the inner surface maintains insulation properties.

Inventive Principle:

Principle #3Local quality

3Strength

If inorganic binder content is increased throughout the entire formed body, then outer surface stiffness is improved, but inner surface cushioning properties are impaired

Engineering Contradiction:

Improveouter surface stiffnessVSAvoidinner surface cushioning properties

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent precisely applies local quality by controlling the inorganic binder content to increase toward the outer circumferential surface only. This localized concentration of binder provides the necessary outer surface stiffness for mechanical strength while preserving the cushioning properties at the inner surface that contact the hollow interior, thus resolving the contradiction between stiffness and cushioning.

Inventive Principle:

Principle #3Local quality

4Shape

If stamping method is used to produce heat insulating material, then ring-shaped material can be produced, but it is not economically feasible

Engineering Contradiction:

Improvering-shaped material productionVSAvoideconomic feasibility

Core Design Contradiction:

ShapeVSEase of manufacture

Solution Approach 1:

The patent replaces the mechanical stamping process with a chemical-biological approach using inorganic binder that binds inorganic fibers together through setting reactions. This substitution eliminates the need for expensive stamping equipment and processes, making ring-shaped heat insulating material production economically feasible while maintaining the desired shape and properties.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 provides improved physical strength and resistance to damage on the outer surface without compromising cushioning properties, ensuring effective heat insulation and protection against contact and temperature fluctuations.

Implementation Method 1

the bulk density of the inorganic fiber formed body increases toward the outer circumferential surface (a)

Methodology Applied

Scientific EffectBulk density gradient:

Implementation Method 2

the inorganic fiber formed body is an inorganic fiber formed and fired body including inorganic binder particles that bond the inorganic fibers to each other

Methodology Applied

Scientific EffectInorganic binder bonding: Adhesive

Implementation Method 3

A heat insulating protective member comprising an inorganic fiber formed body having a hollow cylindrical shape

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS20220341667A1Heat Insulating Protective Member, Method for Manufacturing Same, Method for Installing Same, In-Furnace Member, and Reheating Furnace

Publication Date: 2022.10.27 MAFTEC CO LTD

AI summary

A heat insulating protective member including an inorganic fiber formed body having a hollow cylindrical shape or a split hollow cylindrical shape, wherein the inorganic fiber formed body has an inner circumferential surface (c) facing a hollow and an outer circumferential surface (a) constituting an outer circumference, and the bulk density of the inorganic fiber formed body increases toward the outer circumferential surface (a).