Textiles: weaving – Miscellaneous – Loom cleaning
Patent
1993-08-18
1995-12-05
Falik, Andy
Textiles: weaving
Miscellaneous
Loom cleaning
57308, 19 66CC, 15301, 165 47, 34435, D03J 100
Patent
active
054720184
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for the air conditioning of a weaving machine, and more particularly to a device for the air conditioning a weaving machine.
2. Related Art
With the objective of reducing the interruptions of operation of powerful weaving machines, which interruptions result mainly from thread breakages, attempts have been made for a relatively long time to optimize the weaving conditions. Endeavours to achieve this objective just by influencing the space air conditioning of a weaving machine room result in a large volume flow of air, with a large power requirement per machine.
However, in connection with dust removal, processes are also known by which the climate directly at the weaving machine is influenced. In a known process of this type, conditioned air is supplied both via ceiling outlets distributed within the room and also through local outlets. In this case, for each machine a local outlet is provided, which exhibits a slot-shaped exit opening at a spacing above the warp. In another known process, the local outlets are disposed below the warps. In both cases, the exit opening extends approximately transversely to the warp over its full width and releases a jet of conditioned air, which jet is directed towards the warp.
In a report entitled "Weaving machine dust removal and air conditioning of a weaving machine--a conflict?" (Dr.-Ing. Helmut Weinsdorfer, Dipl.-Ing. Ulrich Stark), presented on the occasion of the 6th Weaving Industry Colloquium (16/17 October 1990) and published by the Institute for Textile and Process Technology, 7306 Denkendorf, Germany, an experimental arrangement is described which exhibits a local outlet of the above type, which outlet is directed vertically from above onto the back shed.
In the majority of cases, the air conditioning of the machine using local outlets brings, related to the frequency of thread breakage, a marked improvement as compared with applications in which an influence is exerted on the humidity conditions at the weaving machine only via the space air conditioning. In addition to this, there is also a considerably lower power requirement. However, in order to achieve satisfactory results it is still necessary to generate considerable volume flows of air, and as far as the operating costs are concerned the increased maintenance effort for the cleaning of the local outlets is also significant.
SUMMARY OF THE INVENTION
The object of the invention is to provide a process which brings an effective conditioning with a considerable reduction of the air conditioning costs per weaving machine by reduced power requirement and volume flow of air as well as lower water consumption, without creating an impermissible obstruction in visual terms or for accessibility.
In the present context, a piston-type displacement flow is understood as referring to a low-turbulence flow with a distribution which is approximately uniform over its full cross section and approximately equal velocity. In this case, exit velocities between 0.3 and 1.2 m/sec enter into consideration.
The invention is based on the finding that the transport of the moisture by an air jet blown out from a slot-shaped exit opening is of low effectiveness and is therefore uneconomical. What is responsible for this is mainly the relatively high exit velocity which is required for the throughput of the required quantity of air. Investigations demonstrate that in the first instance a considerable part of the conditioning air blown out does not reach the (still noninterwoven) warp threads. Subsequently, a part of this air rebounds at the warp, without being able to give off its humidity. This means that considerably more conditioned air must be conveyed than comes into action at the warp to achieve the relative humidity aimed at.
The displacement flow employed according to the invention permits a quite considerable reduction of the required exit velocity as compared with that from a slot-shaped exit opening, with an equal path to be traver
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Dr.-Ing. Helmut Weinsdorfer, Ulrich Stark Webmaschinenentstaubung und Webmaschinenklimatisierung-ein Widerspruch? 6.Weberei-Kolloquium--Die Peripherie beeinfusst den Nutzeffekt--16.und 17. Oktober 1990.
Internationales Textil-Bulletin Weltausgabe Weberei No. 1, 1973, pp. 54-59 Geb. Sulzer A.G. "Einzelklimatisierung an Sulzerwebmachinen".
Bollier Walter
Verner Pavel
Falik Andy
Luwa AG
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