Volume Store Dampens Pressure Pulses in Thread Entanglement Apparatus
Solution Overview
Problem
Existing apparatuses for producing entanglements on multifilament threads using pulse-like compressed-air flows face challenges with pressure losses and noise at high thread speeds, limiting them to speeds below 500 m/min and requiring high pressures for effective entanglement production.
Innovation Solution
Incorporating a volume store with a storage volume greater than the pressure chamber's volume, connected directly to the pressure source via a pressure regulator, to absorb and damp pressure pulses, ensuring a constant compressed-air supply and producing highly dynamic flows at high pressures, allowing for thread speeds above 2000 m/min.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a pulse-like compressed-air flow is produced using a pressure chamber connected to a pressure source, then entanglements can be produced on multifilament threads, but pressure fluctuations and noise occur within the pressure chamber, and the apparatus is limited to relatively slow thread running speeds in the region of 500 m/min
Solution Approach 1:
The invention introduces a volume store that is pre-filled with compressed air before the pulsing operation begins. This preliminary preparation ensures that when the pressure chamber operates, it draws from a buffered supply rather than directly from the pressure source, thereby stabilizing the compressed-air supply and enabling higher thread running speeds without compromising reliability.
Solution Approach 2:
The volume store acts as a cushioning element that absorbs pressure fluctuations and dampens noise before they propagate through the system. By placing this cushioning mechanism between the pressure source and the pressure chamber, the invention protects the compressed-air supply network from the adverse effects of pulsing operation, thus maintaining stable operation at higher speeds.
2Stress or pressure
If high operating pressures are used to produce intense compressed-air flows for entanglement, then effective thread treatment is achieved, but pressure losses within the pressure chamber increase, requiring rapid compensation to maintain the same intensity
Solution Approach 1:
The volume store serves as an intermediary between the pressure source and the pressure chamber. It buffers the pressure fluctuations caused by rapid air consumption during pulsing, thereby reducing pressure losses and eliminating the need for rapid compensation. This intermediary mechanism allows the system to maintain stable high operating pressures without excessive energy loss.
3Volume of stationary object
If the pressure chamber volume is kept small for compact design, then the apparatus size is reduced, but pressure pulses propagate rapidly causing disruptions and noise in the compressed-air supply
Solution Approach 1:
The volume store acts as an intermediary that isolates the pressure chamber from the compressed-air supply network. Even though the pressure chamber remains small for compact design, the volume store absorbs the pressure pulses generated within it, preventing noise and disruption from propagating through the supply system.
Solution Approach 2:
The invention changes the volume parameter of the compressed-air storage system by introducing a separate volume store with significantly larger capacity than the pressure chamber. This parameter change allows the pressure chamber to remain compact while the overall system provides sufficient buffering capacity to dampen pressure pulses and reduce noise.
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
The solution enables the production of stable and pronounced entanglements and intertwining knots at high thread speeds with minimal pressure drop, maintaining constant operating pressure and reducing noise, making the apparatus suitable for speeds exceeding 2000 m/min.
Implementation Method 1
the storage volume of the volume store is greater by a multiple, preferably by a factor >20, than the chamber volume of the pressure chamber... the pressure pulses that occur in operation can be absorbed within the volume store and damped with respect to the compressed-air supply network
Implementation Method 2
a compressed-air flow being directed substantially transversely to a continuously guided thread... a pulse-like compressed-air flow is produced in the treatment channel via the nozzle bore... said compressed-air flow being directed recurrently at the thread in a time sequence
Data Source
AI summary
An apparatus for producing entanglements on a multifilament thread, has a treatment channel, has a nozzle bore that opens into the treatment channel and has an air supply device. The air supply device interacts with the nozzle bore in order to produce pulse-like compressed-air flows, wherein the compressed air is produced via a pressure chamber and a pressure source. In order in particular to control the pressure pulses produced in the pressure chamber, a volume store is arranged between the pressure chamber and the pressure source, wherein the volume store has a storage volume which is greater than a chamber volume of the pressure chamber.