Air Jet Spinning Yarn Element Insert for Piecing Efficiency

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Solution Overview

Problem

Existing yarn-forming elements in air-jet spinning machines face challenges during the piecing process, where the air flow escaping through the exhaust air opening can generate unfavorable conditions for the return of the yarn end, leading to inefficient yarn production.

Innovation Solution

The yarn-forming element features an inner insert with a discharge channel and laterally branching air outlet openings, which prevent the air flow from entering the turbulence chamber, ensuring that only the necessary air flow enters the eddy chamber for yarn return, while the excess air is diverted through a chamber and air discharge duct, maintaining high air velocity and preventing air leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If air outlet openings are provided in the discharge channel to remove air during piecing, then air build-up is prevented and air speed is maintained, but air flow enters the turbulence chamber and generates unfavorable conditions for yarn end return

Engineering Contradiction:

Improvepiecing efficiencyVSAvoidunfavorable air flow conditions

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The discharge channel is segmented into two separate pathways: one leading to the turbulence chamber for yarn end return, and another leading to a separate air discharge duct for air removal. This segmentation prevents the harmful mixing of air flow paths while maintaining both functions independently.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The air removal function is extracted from the main discharge channel by providing a separate air discharge duct. This extracts the harmful air flow path from the useful yarn end return path, allowing air to be removed without interfering with the turbulence chamber air flow conditions.

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of operation

If air flow is introduced into the discharge channel counter to spinning direction for yarn end return, then yarn end can be conveyed into the vortex chamber, but air build-up occurs in the transition area between discharge duct and inlet opening

Engineering Contradiction:

Improveyarn end returnVSAvoidair build-up

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The discharge channel is divided into two separate outlets: one for yarn end return to the turbulence chamber and another for air discharge. This segmentation allows the air flow introduced for yarn end return to be partially diverted away, preventing air build-up in the transition area while maintaining the necessary air flow for yarn end conveyance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The air discharge duct creates a parallel pathway that copies the air removal function from the main discharge channel, allowing excess air to be removed through a separate route while the main channel maintains the air flow necessary for yarn end return.

Inventive Principle:

Principle #26Copying

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 design ensures a reliable return of the yarn end during the piecing process by maintaining consistent air velocity and preventing air flow interference within the turbulence chamber, thereby enhancing yarn production efficiency.

Implementation Method 1

an air flow introduced into the discharge channel counter to the spinning direction

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

air outlet openings branching off laterally from the discharge channel, so that an air flow introduced into the discharge channel counter to a spinning direction partly via the air outlet openings and partly can escape via the inlet opening

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 3

the second partial air flow enters the vortex chamber surrounding the yarn forming element via the inlet opening and in so doing brings about the desired return of the yarn end during the piecing process

Methodology Applied

Scientific EffectVortex flow:

Data Source

PatentEP2730685B1Yarn forming element for an air jet spinning machine with an insert and spindle equipped with the same

Publication Date: 2018.12.05 MASCHINENFABRIK RIETER AG

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AI summary

The yarn formation element (1) has a spinning tip (4) that is provided with an inlet opening (6) surrounded with an outermost surface (5). The air flow is enabled in the inlet opening for forming the yarn (2). An insert (7) is inserted into the inlet opening and is adjoined with an exhaust duct (8). Several air outlet apertures (9) are branched laterally from the exhaust duct so that an air flow is partially brought into the exhaust duct against the spinning direction (S) over the air outlet apertures and is escaped partially over the inlet opening. An independent claim is included for spinning nozzle of air spinning machine.