Air-jet Spinning Device Helical Thread Airflow Control
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Solution Overview
Problem
Air-jet type spinning devices face high energy consumption, production costs, and variability in yarn quality due to sensitive compact spinning chambers prone to dirt and fibril interference, with compressed air jets being difficult to control within the chamber.
Innovation Solution
The air-jet spinning device features a wider spinning chamber with optimized fibre feeding and air injection geometries, including a fibre feeding channel with inclined sections and a helical thread guiding compressed air jets, allowing for reduced air consumption and improved fibre twisting efficiency, while minimizing interference from impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the spinning chamber dimensions are reduced to limit compressed air consumption, then air consumption decreases, but the chamber becomes extremely sensitive to dirt and fibrils compromising yarn quality
Solution Approach 1:
The patent changes the geometric parameters of the spinning chamber, specifically increasing its dimensions and modifying the nozzle arrangement. This allows maintaining lower air consumption while reducing sensitivity to impurities through optimized chamber volume and improved airflow control geometry
2Reliability
If multiple holes (4 or more) are used for compressed air injection, then yarn formation is improved, but air consumption and energy costs increase considerably
Solution Approach 1:
The patent extracts or reduces the number of air injection holes from the conventional 4 or more down to 2 holes. This reduction is compensated by optimizing the geometry and positioning of these fewer holes, allowing effective yarn formation with reduced air consumption
3Loss of energy
If the spinning chamber is made compact to reduce air consumption, then air consumption decreases, but the precise direction control of compressed air jets becomes structurally limited
Solution Approach 1:
The patent modifies the geometric parameters of both the spinning chamber and the air injection nozzles. The chamber dimensions are increased while nozzle geometries are optimized to provide precise tangential and downward inclination, enabling effective jet direction control without requiring an extremely compact chamber configuration
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 reduces air consumption, enhances yarn quality and strength by ensuring consistent operating conditions, and allows for better management of impurities, resulting in more repeatable and regular yarn production with reduced production costs.
Implementation Method 1
a helical thread (84) made on the outer periphery of said spinning chamber (12) and oriented along a spinning direction (X-X) of the spinning spindle (48), said jet being directed towards said helical thread (84) so as to be guided and oriented by the latter
Implementation Method 2
create the necessary depression to suck the fibres inside the spinning spindle
Implementation Method 3
This web is subjected to the action of compressed air jets which allow the outermost fibres to open and wrap around the central ones and form the yarn
Data Source
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AI summary
An air-jet type spinning device (4), comprising an at least partially hollow body (8) which delimits a cylindrical spinning chamber (12), the body comprising at least one injection hole (16) configured to introduce a flow of compressed air in said spinning chamber (12), a fibre feeding device (20), facing said spinning chamber (12) so as to feed the fibres in the spinning chamber (12). The fibre feeding device (20) comprises a fibre feeding channel (24) having a first straight section (28) leading, at a shoulder (32), into a pre-chamber (36) facing and communicating with said spinning chamber (12). The spinning device comprises a spinning spindle (48) at least partially inserted in the spinning chamber (12) and fitted with a spinning channel (52) for the transit of yarn obtained from said fibres, the spinning channel (52) having a main axis which defines a spinning direction (X-X), and having a front input (56) for the introduction of the yarn in said spinning channel (52). Advantageously, a diameter (60) of the spinning chamber (12), measured relative to a cross-section plane perpendicular to said main axis, is between 5.6 and 7.4 mm.