Polygonal Pipe Shell Winding with Variable Angular Speed

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Solution Overview

Problem

Existing methods for manufacturing pipe shells with non-circular cross-sections, such as those for chimney systems, are complex and inefficient, requiring assembly of individual segments and resulting in high manufacturing costs and inhomogeneous insulation properties.

Innovation Solution

A method involving a winding core with a polygonal cross-section and controlled angular speed to maintain constant tensile forces during the winding process, allowing for the production of polygonal pipe shells with improved homogeneity and dimensional accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a polygonal winding core is used to manufacture pipe shells with non-circular cross-sections, then the manufacturing efficiency and homogeneity of insulation properties are improved, but the tensile forces on the web section become excessive and cause material strain

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidtensile forces on web section

Core Design Contradiction:

ProductivityVSForce

Solution Approach 1:

The winding core is driven at inconstant angular speed that varies as a function of the effective distance of the web section from the axis of rotation. This dynamic speed adjustment compensates for the varying radius in polygonal cross-section winding, maintaining substantially constant tensile forces on the web section while enabling efficient mass production of polygonal pipe shells

Inventive Principle:

Principle #15Dynamics

2Device complexity

If the winding core is driven at constant angular speed, then the control system is simplified, but the tensile forces on the web section vary significantly causing inhomogeneous insulation properties

Engineering Contradiction:

Improvecontrol system complexityVSAvoiddimensional accuracy and homogeneity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The angular speed of the winding core is controlled based on feedback from the effective distance of the web section from the axis of rotation. This feedback control ensures that tensile forces remain substantially constant throughout the winding process, achieving high dimensional accuracy and homogeneous insulation properties

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If individual segments are assembled to create polygonal pipe shells, then the manufacturing flexibility is improved, but the manufacturing complexity and costs increase

Engineering Contradiction:

Improvemanufacturing flexibilityVSAvoidassembly process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention merges multiple individual segment assemblies into a single integrated winding process. By using a polygonal winding core with variable angular speed control, the entire pipe shell with non-circular cross-section is manufactured as one continuous piece, eliminating assembly complexity while maintaining manufacturing flexibility

Inventive Principle:

Principle #5Merging (Combining)

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

Enables the efficient mass production of polygonal pipe shells with accurate dimensions and enhanced insulation properties, reducing manufacturing costs and eliminating the need for assembling individual segments, while ensuring the mineral wool material is not subjected to excessive strain.

Implementation Method 1

the pipe shell thus formed and still unset is set at the outer circumference of the winding core by the action of heat

Methodology Applied

Scientific EffectThermal setting: Heat Treatment

Implementation Method 2

the winding core has circumferential perforations through which hot gas can be directed to the inner surface of the pipe shell and through the wall thickness of the pipe shell

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

hot gas can be directed to the inner surface of the pipe shell and through the wall thickness of the pipe shell

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentEP3096933B1Method and device for manufacturing pipe shells and pipe shell manufactured therewith

Publication Date: 2020.07.15 SAINT GOBAIN ISOVER

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AI summary

The invention relates to a method for manufacturing pipe shells (24') of bound mineral wool, wherein a web section (17) of a mineral wool web is wound around a winding core (1) and wherein the pipe shell (24) thus formed is set by the action of heat. The winding core (1) has a polygonal cross-section, wherein the pipe shell (24) also obtains a polygonal cross-section during winding. Furthermore, the winding core (1) is driven at inconstant angular speed, wherein the angular speed of the winding core (1) varies as a function of the effective distance of the region of the web section (17) which meets the outer circumferential face from the axis of rotation of the winding core (1), so that the tensile forces acting on the web section (17) during the winding process vary at a lesser degree and are in particular substantially constant. The invention further relates to an appropriate device, a winding core (1) as well as a pipe shell (24'). Thus, there are provided a method and a device for manufacturing such pipe shells (24') with non- circular cross-section by means of which the manufacturing effort is reduced as compared to prior art.