Open-End Spinning Machine Boundary Layer Suction
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Solution Overview
Problem
Existing open-end spinning devices face challenges in improving flow conditions within the fiber guide channel, particularly at the inlet opening, which affects the detachment and entry of individual fibers from the opening roller and their transport into the fiber guide channel.
Innovation Solution
The integration of a boundary layer suction device at the inlet side of the fiber guide channel, featuring suction openings tangentially arranged on the wall of the opening roller housing, prevents turbulent flow and backflow, enhancing fiber alignment and transfer by increasing the average flow speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fiber guide channel inlet opening is designed to accept individual fibers from the opening roller, then fiber entry is enabled, but turbulent flow and backflow occur at the inlet causing flow separation and reduced fiber transfer efficiency
Solution Approach 1:
The patent extracts and removes the turbulent boundary layer at the fiber guide channel inlet using suction openings. By selectively removing the unstable boundary layer air flow, the invention eliminates flow separation and backflow while maintaining the necessary pressure differential for fiber transport, thus improving both flow stability and fiber transfer efficiency
Solution Approach 2:
The patent changes the flow parameters at the fiber guide channel inlet by introducing boundary layer suction. This modifies the velocity profile and pressure distribution at the inlet, transforming the flow from a turbulent, separating state to a stable, attached flow regime that efficiently transports fibers
2Reliability
If suction openings are added to the fiber guide channel inlet to improve flow conditions, then flow stability improves, but device complexity increases
Solution Approach 1:
The suction openings serve multiple functions simultaneously: they remove the turbulent boundary layer to prevent flow separation, they control the pressure distribution at the inlet, and they enhance fiber detachment from the opening roller. This multi-functionality achieves flow stabilization without requiring additional complex control systems or components
Solution Approach 2:
The boundary layer suction system utilizes the existing negative pressure in the rotor housing to drive the suction flow. The system is self-regulating, where the pressure differential automatically adjusts the suction rate based on operating conditions, eliminating the need for external control mechanisms or additional energy input
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 significantly improves the detachment of individual fibers from the opening roller and their entry into the fiber guide channel, reducing the risk of fiber loss and optimizing the flow conditions, leading to more efficient pneumatic transport.
Implementation Method 1
a boundary layer suction device 28 according to the invention is installed in the entry area 43 of the fiber guide channel 14
Implementation Method 2
the suction force effective in the area of the boundary layer suction device can be specified in a defined manner via the design and/or the number of suction openings
Implementation Method 3
due to the negative spinning pressure in the rotor housing, there is also negative pressure in the entrance area of the fiber guide channel, which, in conjunction with the centrifugal force acting on the individual fibers accelerated by the opening roller to almost the rotational speed, ensures that the individual fibers are separated from the opening roller
Implementation Method 4
the centrifugal force acting on the individual fibers accelerated by the opening roller to almost the rotational speed, ensures that the individual fibers are separated from the opening roller
Data Source
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AI summary
The open end-spinning device (1) has a spinning rotor (3) which is rotatably supported in a low-pressure chargeable rotor housing and is pneumatically connected with a release roller (21) over a conically incoming fiber conducting channel (14). The release roller is rotatably supported in a release roller housing (17). A unit is provided for influencing a transport air flow available in the fiber conducting channel. The unit is pneumatically arranged in the area of the fiber conducting channel. A boundary layer-suction unit is installed at the input side of the fiber conducting channel.