Composite Pipe Socket Production Using Dynamic Pneumatic Pressure

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Solution Overview

Problem

The existing methods for producing composite pipes with wave crests face challenges in ensuring a sufficiently large cross-section for overflow channels, leading to incomplete ventilation and potential clogging, which affects the welding quality and contact between the inner and outer hoses, especially at higher production speeds or larger pipe diameters.

Innovation Solution

The implementation of an additional gas channel that can be pressurized above atmospheric pressure and subjected to partial vacuum, ensuring a slight overpressure between the calibrating mandrel and the inner hose, and a partial vacuum during the inner hose's formation to enhance ventilation and prevent clogging, while maintaining direct contact with the mandrel for cooling and strengthening.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the transition section is directed outwards steeply to prevent dead spaces, then dirt accumulation is prevented, but the risk of incomplete contact between inner hose and outer hose increases

Engineering Contradiction:

Improvedirt accumulation in dead spacesVSAvoidwelding quality between inner hose and outer hose

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent uses pneumatic pressure (overpressure) applied to the inner hose during the formation of the transition section to force the inner hose outward into full contact with the outer hose. This ensures complete welding contact in the steeply directed transition section while preventing dirt accumulation, resolving the contradiction between preventing dead spaces and ensuring reliable welding contact.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Productivity

If production speed is increased, then productivity improves, but the overflow channel cross-section becomes insufficient for desired ventilation

Engineering Contradiction:

Improveproduction speedVSAvoidventilation effectiveness in overflow channel

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies overpressure to the inner hose before and during the formation of the transition section and overflow channels. This preliminary pneumatic action ensures that the inner hose is already positioned correctly and the overflow channels are properly formed with adequate cross-section even at high production speeds, maintaining ventilation effectiveness while achieving high productivity.

Inventive Principle:

Principle #10Preliminary action

3Strength

If the inner hose is cooled by direct contact with the calibration mandrel, then the inner hose is strengthened, but the plastic melt may clog the overflow channels

Engineering Contradiction:

Improvestrength of inner hose in transition sectionVSAvoidflow through overflow channels

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent uses dynamic pressure control where the inner hose is subjected to overpressure during transition section formation to ensure contact and welding, then the pressure is released or reduced during overflow channel formation to allow proper channel creation without clogging. This dynamic adjustment of pneumatic pressure resolves the contradiction between strengthening the hose through mandrel contact and preventing melt clogging of overflow channels.

Inventive Principle:

Principle #15Dynamics

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

This solution ensures good welding between the inner and outer hoses, reduces friction, and prevents the inner hose from clogging the overflow channels, maintaining the welding quality and preventing dead spaces where dirt can accumulate, thus ensuring full-surface contact and effective production.

Implementation Method 1

the additional gas channel can be pressurized both with excess pressure compared to atmospheric pressure... so that on the one hand good welding occurs between the inner hose and the wave troughs of the outer hose and on the other hand the friction between the inner tube and the calibration mandrel is eliminated

Methodology Applied

Scientific EffectOverpressure: Pressure Increase

Implementation Method 2

the formation of the overflow channels is positively influenced by the fact that the inner hose is subjected to a slight partial vacuum from the inside during its formation, whereby the inner hose in this area is in contact with the calibration mandrel over a short production line and is cooled there

Methodology Applied

Scientific EffectPartial vacuum: Vacuum

Implementation Method 3

the inner hose in this area is in contact with the calibration mandrel over a short production line and is cooled there

Methodology Applied

Scientific EffectConductive cooling: Conduction (thermal)

Data Source

PatentEP2425958B1Apparatus for continuouly producing a compound pipe comprising a pipe socket

Publication Date: 2014.01.29 HEGLER RALPH PETER

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AI summary

During the production of a composite pipe consisting of an inner tube (39) and a corrugated outer tube (37), the inner tube (39), guided over a calibration dome (25), is pressurized from the inside with a slight overpressure relative to atmospheric pressure pa during the production of the corrugated outer tube (37). During the transition to forming a pipe socket, the inner tube (39) is briefly pressurized with a negative pressure p3 relative to atmospheric pressure pa.