Rotor Spinning Machine Vacuum Layout for Lower Pressure Loss
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Solution Overview
Problem
Conventional rotor spinning machines face limitations in increasing the number of work stations due to issues with elongation and torsion when using central drives, and the supply of negative spinning pressure becomes inefficient, leading to energy losses and operational challenges.
Innovation Solution
The rotor spinning machine is designed with multiple work stations having individual drives for spinning rotors and separate vacuum sources at each end, reducing pressure losses and energy consumption by distributing vacuum channels over fewer stations, and using non-contact magnetic bearings to minimize flexing work losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a central drive is used to power all working elements from one end of the machine, then the machine structure is simplified and easier to manufacture, but thermal expansion and torsion problems increase with machine length
Solution Approach 1:
The patent divides the machine into two sections with an intermediate frame, and places central drives in both the end frame and intermediate frame. This segmentation reduces the length of drive shafts and belts, thereby minimizing thermal expansion and torsion effects while maintaining the simplicity of central drive architecture.
2Productivity
If the number of workstations is increased to meet productivity demands, then productivity increases, but thermal expansion and torsion problems worsen
Solution Approach 1:
By introducing an intermediate frame that divides the machine into two sections, the patent enables increased number of workstations while keeping drive element lengths manageable. The segmentation ensures that even as machine length increases for higher productivity, the critical drive shafts and belts remain short enough to avoid excessive thermal expansion and torsion.
3Device complexity
If a single vacuum source is used centrally located, then the vacuum generation device is simplified, but pressure losses increase in the vacuum channel
Solution Approach 1:
The patent places separate vacuum sources in both end frames, dividing the single long vacuum channel into two shorter channels. This segmentation reduces pressure losses in each channel while the overall vacuum generation system remains relatively simple with only two vacuum sources instead of one complex distributed system.
4Productivity
If vacuum channels extend over the entire machine length, then all workstations can be supplied, but pressure losses and energy consumption increase
Solution Approach 1:
By placing vacuum sources at both ends and dividing the workstation supply into two separate channels, the patent reduces each vacuum channel's length approximately by half. This segmentation maintains full coverage of all workstations while dramatically reducing pressure losses and energy consumption in each channel.
5Stability of the object's composition
If an intermediate frame is added to reduce component lengths, then thermal expansion and torsion are reduced, but access to components and material supply become more complex
Solution Approach 1:
The intermediate frame is designed not only as a structural element but also as a functional hub that houses central drives and vacuum sources. This segmentation creates modular sections that can be accessed independently, and the intermediate frame itself provides access points for maintenance and material supply, thus reducing the accessibility penalty.
6Productivity
If machine length is increased to accommodate more workstations, then productivity increases, but the required length of vacuum channels and drive elements increases causing technical problems
Solution Approach 1:
The patent introduces an intermediate frame that segments the machine into two sections, allowing the overall machine length to increase for higher productivity while keeping critical components (vacuum channels and drive elements) confined to shorter segments. Each section has its own vacuum source and central drive, so the channel and drive element lengths do not scale with total machine length.
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 configuration allows for a significant increase in the number of work stations while reducing energy consumption and operational costs, maintaining efficient vacuum supply and accessibility for maintenance, and improving the overall energy-saving and cost-effective operation of the machine.
Implementation Method 1
The spinning rotors are mounted in a magnetic bearing
Implementation Method 2
a suction device for generating a spinning vacuum at the working stations
Data Source
Figure 1
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AI summary
A rotor spinning machine has a plurality of working positions (3) arranged next to each other in the longitudinal direction of the rotor spinning machine (1) between two front ends (2) of the rotor spinning machine, each working position having a plurality of working units for producing and winding up a yarn (31). The working units comprise at least one feed device (4), an opening device (5), a spinning rotor (6) and a winding device (7). The rotor spinning machine further comprises a suction device (8) for producing a negative spinning pressure at the working positions. The suction device comprises at least two separate negative pressure sources (9), a negative pressure source being arranged at each of the two front ends of the rotor spinning machine, and each negative pressure source being connected to a separate negative pressure channel (10) which extends only over a part of the working positions in the longitudinal direction of the rotor spinning machine. Every working position has an individual drive (11), in particular an electrical individual drive for the spinning rotor.