EP2692916B1 - Method for operating a spinning device, rotor spinning machine with a spinning device and spinning device - Google Patents

Method for operating a spinning device, rotor spinning machine with a spinning device and spinning device Download PDF

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Publication number
EP2692916B1
EP2692916B1 EP13003141.2A EP13003141A EP2692916B1 EP 2692916 B1 EP2692916 B1 EP 2692916B1 EP 13003141 A EP13003141 A EP 13003141A EP 2692916 B1 EP2692916 B1 EP 2692916B1
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EP
European Patent Office
Prior art keywords
rotor
spinning
housing
drive
drive housing
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EP13003141.2A
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German (de)
French (fr)
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EP2692916A2 (en
EP2692916A3 (en
Inventor
Heinz-Georg Wassenhoven
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saurer Spinning Solutions GmbH and Co KG
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Saurer Germany GmbH and Co KG
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Publication of EP2692916A2 publication Critical patent/EP2692916A2/en
Publication of EP2692916A3 publication Critical patent/EP2692916A3/en
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Publication of EP2692916B1 publication Critical patent/EP2692916B1/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/14—Details
    • D01H1/20—Driving or stopping arrangements
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D01H4/12—Rotor bearings; Arrangements for driving or stopping
    • D01H4/14—Rotor driven by an electric motor

Definitions

  • the invention relates to a method for operating a spinning device of a rotor spinning machine, wherein a spinning rotor with a rotor cup and a rotor shaft by a single electric drive, which is arranged in a drive housing, is set in rotation and the electric single drive is in operative connection with the rotor shaft, the Rotor shaft is supported by means of a magnetic bearing assembly, which is also arranged in the drive housing, a rotor housing, in which the rotor cup is disposed, is subjected to negative pressure during the spinning operation and the rotor shaft extends through a connection opening between the drive housing and the rotor housing.
  • the invention further relates to a rotor spinning machine with a plurality of spinning stations, each having a spinning device.
  • the invention also relates to the spinning device itself.
  • the spinning device has a spinning rotor with a rotor cup and a rotor shaft, a single electric drive, which is designed to set the spinning rotor in rotation and is in operative connection with the rotor shaft, a magnetic bearing arrangement for supporting the rotor shaft a rotor housing, which is subjected to negative pressure and in which the rotor cup is arranged, a connection opening between the drive housing and the rotor housing, through which the rotor shaft extends, a drive housing in which the electric single drive and the magnetic bearing arrangement is arranged and which an air inlet for supplying compressed air into the drive housing, on.
  • the rotor spinning machine has a compressed air source, which is connected to the air inlet, and a control device for controlling the compressed air source.
  • the EP 0 972 868 A2 discloses a single electric drive for a spinning device.
  • the spinning rotor is supported without contact with its rotor shaft in a magnetic bearing arrangement.
  • a rotor housing surrounding the rotor cup of the spinning rotor communicates with a vacuum source to create and maintain the vacuum necessary in the rotor housing.
  • the rotor housing is closed during the spinning process by means of a pivotally mounted cover element.
  • the magnetic bearing assembly is in turn housed in a drive housing, which connects to the rotor housing.
  • the drive housing and the rotor housing communicate with each other via an opening through which the rotor shaft extends.
  • the rotor housing and the drive housing are sealed together to the outside.
  • the individual drive and the magnetic bearing arrangement should be protected against contamination from the surroundings of the spinning machine by the sealing of the drive housing. Due to the joint sealing, there is also a negative pressure in the drive housing during the spinning process. After the pressure has been equalized, no air flow arises behind the rotor cup in the region of the rotor shaft, so that dust and / or fiber material deposits at this point during the spinning operation.
  • dust and / or fiber material can not only penetrate through the connection opening between the drive housing and the rotor housing. Even if the drive housing is sealed accordingly, dust and fibers can penetrate into the drive housing at transition points between housing parts. A hundred percent sealing is not possible.
  • the load with dust and fiber material is particularly high during operation of the spinning device, since in operation, the processed sliver and the spun yarn are moved.
  • the CH 571 582 A5 discloses a non-generic spinning device.
  • the spinning rotor is driven individually by means of a pneumatic turbine and is supported by means of an air bearing.
  • compressed air is supplied from an external source of the turbine.
  • the air emerging from the turbine is conducted via a channel into the air bearing, in which the air is distributed by means of a plurality of passages and passes through a plurality of air supply ducts in the gap between the rotor shaft and a cylindrical, the rotor shaft enclosing support body of the bearing.
  • the air exits through outlets continuously from the camp. For storage, it is necessary that the air in the bearing is in motion throughout the spinning operation.
  • a labyrinth seal is additionally arranged in the shaft passage opening between the rotor housing and the bearing housing.
  • a conical labyrinth seal should be used, so that a weak flow opens into the rotor housing. Because the air in the warehouse must be constantly in motion, the compressed air consumption and thus the energy consumption of such an arrangement are relatively high.
  • the object is achieved by the characterizing features of the method claim 1, the rotor spinning machine according to claim 2 and the spinning device according to claim 3.
  • the drive housing is subjected to compressed air both during the spinning process and during an interruption of the spinning process such that a static overpressure relative to the ambient pressure prevails in the drive housing at least during the spinning process, wherein the connection opening is sealed by means of a labyrinth seal.
  • the drive housing is subjected to compressed air not only during a spinning interruption but also during the spinning process.
  • the resulting overpressure in the drive housing reliably prevents dirt and fiber material from entering the drive housing.
  • the connection opening is sealed by means of a labyrinth seal.
  • Labyrinth seals are known in the art in principle. It is a non-contact shaft seal, so that even at high speeds no wear due to friction occurs.
  • the sealing effect is based on fluidic effects by the extension of the gap to be sealed. The sealing effect depends on the speed of the shaft. A most extensive seal is achieved with a rotating shaft. In a standing wave, the sealing effect is low.
  • the drive housing In spinning operation with a rotating spinning rotor, the drive housing is thus reliably sealed against the rotor housing. Thus, essentially no air escapes from the drive housing.
  • the drive housing thus has a static overpressure. The energy consumption for the compressed air supply is therefore low.
  • At a spinning break and thus standing rotor lets the sealing effect of the labyrinth seal after.
  • a rotor spinning machine with a spinning device in which between the connection opening and the rotor shaft a labyrinth seal is arranged and in which the control device is adapted to control the compressed air source so that the drive housing both during the spinning process as well is acted upon in such a compressed air at an interruption of the spinning process that at least during the spinning process in the drive housing, a static pressure over the ambient pressure prevails.
  • the invention further relates to the spinning device in which a labyrinth seal is arranged between the connection opening and the rotor shaft.
  • Fig. 1 is a schematic view of a spinning station 1 of a rotor spinning machine shown.
  • the control device 4 serves to control the spinning process at the spinning station 1.
  • the spinning device 3 arranged at the spinning station 1 comprises, as in FIG FIG. 2 shown, a spinning rotor 16, the spinning cup 10 at high speed in a rotor housing 9 rotates.
  • the spinning rotor 16 is driven by an electric single drive 20.
  • the spinning rotor 16 is mounted without contact with its rotor shaft designed as a rotor 11 of the single drive 20 both radially and axially in a magnetic bearing 21.
  • the rotor housing 9 is closed during the spinning process by a pivotally mounted cover element 14.
  • the lid member 14 and the rotor housing 9 have to open and close a locking device which is actuated by both a service unit and the operator.
  • the representation in Fig. 2 shows a sectional view of the rotor housing 9, which is part of the spinning device 3.
  • the single-motor driven spinning rotor 16 comprises a rotor cup 10, which is arranged on a rotor shaft 11 designed as a rotor 11 of the single-motor drive.
  • the rotor 11 is mounted radially and axially contactless in a magnetic bearing assembly 21.
  • the magnetic bearing 21 is only hinted at.
  • the magnetic bearing 21 also has at the rear end of the rotor shaft a comparable arrangement, not shown here. Further details of a non-contact spinning rotor bearing and the electric single drive are, for example, the DE 198 19 767 A1 or the aforementioned EP 0 972 868 A2 removable.
  • a drive housing 15 connects, which is connected to the rotor housing 9.
  • the drive housing 15 surrounds the magnetic bearing assembly and the rotor 11, which extends through a connection opening 17 between the drive and the rotor housing in the interior of the rotor housing 9 to receive the rotor cup 10.
  • a labyrinth seal 18 seals the connection opening 17.
  • the labyrinth seal 18 is arranged in the region of the annular gap between the rotor shaft 11 and the connection opening 17.
  • the drive housing 15 is provided with the air inlet 12, which opens into a substantially annular storage volume 13.
  • the air inlet 12 is connected via a supply line 7 with a compressed air source 6.
  • the compressed air source 6 is in turn connected via a control line 8 to the control device 4 in connection and can be controlled via this.
  • the compressed air source 6 is controlled by the same control device 4 as the spinning process at the spinning station 1.
  • the compressed air source 6 can also be controlled by its own or by a central control device.
  • the control device 4 can operate, for example, a valve, not shown.
  • the lid member 14 is closed and the rotor housing 9 is acted upon by means of a vacuum source, not shown, with negative pressure.
  • the compressed air source 6 is controlled by the control device 4 so that the drive housing 15 is acted upon by compressed air.
  • the compressed air is adjusted so that in the drive housing 15 not only an overpressure against the air pressure prevails in the rotor housing 9, but it is generated in the drive housing 15, an overpressure relative to the ambient pressure.
  • the air in the vicinity of textile machinery is usually heavily contaminated with dust and fiber fly. The overpressure prevents dust and / or fiber fly can penetrate into the drive housing 15.
  • the labyrinth seal 18 prevents, as long as the spinning rotor rotates, that a pressure equalization takes place between the rotor housing 9 in the drive housing 15. In the drive housing 15 thus no appreciable air movement takes place. Thus, there is a substantially static overpressure in the drive housing. The energy consumption for the compressed air supply is thus low. Only when a spinning break, when the spinning rotor 16 comes to a standstill, the sealing effect of the labyrinth seal 18 after. It comes so through the connection opening 17 to a pressure equalization between the drive housing 15 and the rotor housing 9. The air flow from the drive housing 15 to the rotor housing 9 prevents dust or fiber residues from penetrating the rotor housing 9 in the drive housing 15.
  • the supplied compressed air does not necessarily need to be increased at this stage.
  • the static pressure in the drive housing 15 decreases in favor of the dynamic pressure.
  • the compressed air supply can be increased and the static pressure in the drive housing can be kept constant. Spider breaks are usually short, so energy consumption is not significantly increased.

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer Spinnvorrichtung einer Rotorspinnmaschine, wobei ein Spinnrotor mit einer Rotortasse und einem Rotorschaft durch einen elektrischen Einzelantrieb, der in einem Antriebsgehäuse angeordnet ist, in Rotation versetzt wird und der elektrische Einzelantrieb dazu in Wirkverbindung mit dem Rotorschaft steht, der Rotorschaft mittels einer Magnetlageranordnung, die ebenfalls in dem Antriebsgehäuse angeordnet ist, abgestützt wird, ein Rotorgehäuse, in dem die Rotortasse angeordnet ist, während des Spinnbetriebes mit Unterdruck beaufschlagt wird und sich der Rotorschaft durch eine Verbindungsöffnung zwischen dem Antriebsgehäuse und dem Rotorgehäuse erstreckt. Die Erfindung betrifft ferner eine Rotorspinnmaschine mit einer Vielzahl von Spinnstellen, die jeweils eine Spinnvorrichtung aufweisen. Die Erfindung betrifft ebenfalls die Spinnvorrichtung selbst. Die Spinnvorrichtung weist einen Spinnrotor mit einer Rotortasse und einem Rotorschaft, einen elektrischen Einzelantrieb, der dazu ausgebildet ist, den Spinnrotor in Rotation zu versetzen und dazu mit dem Rotorschaft in Wirkverbindung steht, eine Magnetlageranordnung zur Abstützung des Rotorschaftes, ein Rotorgehäuse, das mit Unterdruck beaufschlagbar ist und in dem die Rotortasse angeordnet ist, eine Verbindungsöffnung zwischen dem Antriebsgehäuse und dem Rotorgehäuse, durch die sich der Rotorschaft erstreckt, ein Antriebsgehäuse, in dem der elektrische Einzelantrieb und die Magnetlageranordnung angeordnet ist und das einen Lufteinlass zur Zuführung von Druckluft in das Antriebsgehäuse besitzt, auf. Die Rotorspinnmaschine weist eine Druckluftquelle, die mit dem Lufteinlass verbunden ist, und eine Steuereinrichtung zur Ansteuerung der Druckluftquelle auf.The invention relates to a method for operating a spinning device of a rotor spinning machine, wherein a spinning rotor with a rotor cup and a rotor shaft by a single electric drive, which is arranged in a drive housing, is set in rotation and the electric single drive is in operative connection with the rotor shaft, the Rotor shaft is supported by means of a magnetic bearing assembly, which is also arranged in the drive housing, a rotor housing, in which the rotor cup is disposed, is subjected to negative pressure during the spinning operation and the rotor shaft extends through a connection opening between the drive housing and the rotor housing. The invention further relates to a rotor spinning machine with a plurality of spinning stations, each having a spinning device. The invention also relates to the spinning device itself. The spinning device has a spinning rotor with a rotor cup and a rotor shaft, a single electric drive, which is designed to set the spinning rotor in rotation and is in operative connection with the rotor shaft, a magnetic bearing arrangement for supporting the rotor shaft a rotor housing, which is subjected to negative pressure and in which the rotor cup is arranged, a connection opening between the drive housing and the rotor housing, through which the rotor shaft extends, a drive housing in which the electric single drive and the magnetic bearing arrangement is arranged and which an air inlet for supplying compressed air into the drive housing, on. The rotor spinning machine has a compressed air source, which is connected to the air inlet, and a control device for controlling the compressed air source.

Die EP 0 972 868 A2 offenbart einen elektrischen Einzelantrieb für eine Spinnvorrichtung. Der Spinnrotor ist mit seinem Rotorschaft in einer Magnetlageranordnung berührungslos abgestützt. Ein die Rotortasse des Spinnrotors umgebendes Rotorgehäuse steht mit einer Unterdruckquelle in Verbindung, um den im Rotorgehäuse notwendigen Unterdruck zu erzeugen und aufrecht zu erhalten.The EP 0 972 868 A2 discloses a single electric drive for a spinning device. The spinning rotor is supported without contact with its rotor shaft in a magnetic bearing arrangement. A rotor housing surrounding the rotor cup of the spinning rotor communicates with a vacuum source to create and maintain the vacuum necessary in the rotor housing.

Das Rotorgehäuse ist während des Spinnprozesses mittels eines schwenkbar gelagerten Deckelelementes verschlossen. Die Magnetlageranordnung ist ihrerseits in einem Antriebsgehäuse untergebracht, das sich an das Rotorgehäuse anschließt. Das Antriebsgehäuse und das Rotorgehäuse stehen über eine Öffnung miteinander in Verbindung, durch die sich der Rotorschaft erstreckt. Das Rotorgehäuse und das Antriebsgehäuse sind gemeinsam nach außen hin abgedichtet. Dadurch wird zum einen die durch den Druckausgleich zwischen dem Rotorgehäuse und dem Antriebsgehäuse entstehende Verlustleistung der Unterdruckquelle verringert. Zum anderen soll durch die Abdichtung des Antriebsgehäuses der Einzelantrieb und die Magnetlageranordnung gegen Verschmutzung aus der Umgebung der Spinnmaschine geschützt werden. Durch die gemeinsame Abdichtung herrscht während des Spinnprozesses auch im Antriebsgehäuse ein Unterdruck. Nachdem der Druck ausgeglichen ist, entsteht hinter der Rotortasse im Bereich des Rotorschaftes keine Luftströmung, so dass sich an dieser Stelle während des Spinnbetriebes Staub und/oder Fasermaterial ablagert.The rotor housing is closed during the spinning process by means of a pivotally mounted cover element. The magnetic bearing assembly is in turn housed in a drive housing, which connects to the rotor housing. The drive housing and the rotor housing communicate with each other via an opening through which the rotor shaft extends. The rotor housing and the drive housing are sealed together to the outside. As a result, on the one hand, the power loss resulting from the pressure compensation between the rotor housing and the drive housing of the vacuum source is reduced. On the other hand, the individual drive and the magnetic bearing arrangement should be protected against contamination from the surroundings of the spinning machine by the sealing of the drive housing. Due to the joint sealing, there is also a negative pressure in the drive housing during the spinning process. After the pressure has been equalized, no air flow arises behind the rotor cup in the region of the rotor shaft, so that dust and / or fiber material deposits at this point during the spinning operation.

Der im Rotorgehäuse und im Antriebsgehäuse während des Spinnprozesses herrschende Unterdruck wird bei einer Unterbrechung des Spinnprozesses durch das Öffnen des Rotorgehäuses ausgeglichen. Dies führt jedoch dazu, dass Staub und/oder Fasermaterial, welches sich während des Spinnbetriebes hinter der Rotortasse im Bereich des Rotorschaftes ablagert, aufgrund des stattfindenden Druckausgleiches durch den nicht abgedichteten Ringspalt zwischen Rotortasse und Magnetlagerung in das Antriebsgehäuse eingesogen werden. Diese Verunreinigungen lagern sich dann in dem Antrieb ab. Solche Verunreinigungen sind in Verbindung mit Magnetlageranordnungen besonders kritisch, da sie sich in den Lagerluftspalten ablagern, wodurch sich der Lagerluftspalt stetig verkleinert. Die Verringerung des Lagerluftspaltes führt letztlich zum Versagen des gesamten Antriebes, da der erforderliche Ausgleich der Axialbewegung des Rotorschaftes durch eine entsprechende Regelung, wie beispielsweise eine Nullstromregelung, mit zunehmender Verschmutzung nicht mehr möglich ist.The prevailing in the rotor housing and the drive housing during the spinning process negative pressure is compensated for in an interruption of the spinning process by opening the rotor housing. However, this leads to dust and / or fiber material, which deposits during spinning operation behind the rotor cup in the region of the rotor shaft, being sucked into the drive housing due to the pressure equalization taking place through the unsealed annular gap between rotor cup and magnetic bearing. These impurities then deposit in the drive. Such contaminants are particularly critical in conjunction with magnetic bearing assemblies because they deposit in the bearing air gaps, thereby steadily reducing the bearing clearance. The reduction of the bearing air gap ultimately leads to failure of the entire drive, since the required compensation of the axial movement of the rotor shaft by an appropriate control, such as a zero current control, with increasing pollution is no longer possible.

Deshalb wurde bereits in der gattungsbildenden DE 10 2006 045 589 A1 vorgeschlagen, bei einer Unterbrechung des Spinnprozesses vor dem Öffnen des Rotorgehäuses im Antriebsgehäuse durch Zuführung von Druckluft einen Druckausgleich zumindest an den Umgebungsdruck durchzuführen. Durch diese Maßnahme wird erreicht, dass beim Öffnen des Rotorgehäuses Staub und/oder Fasermaterial nicht in das Antriebsgehäuse eingesogen werden. Auf diese Weise ist es jedoch nicht möglich, zu verhindern, dass sich während des Spinnprozesses hinter der Rotortasse im Bereich des Rotorschaftes Staub und/oder Fasermaterial ablagern. Dies kann nicht erst beim Öffnen des Rotorgehäuses bei einer Unterbrechung des Spinnbetriebes zu Problemen führen, sondern bereits während des Spinnprozesses. Bei einem entsprechenden Volumen des Staubs und/oder Fasermaterials gelangt dieses auch ohne eine entsprechende Luftbewegung aus dem Rotorgehäuse in das Antriebsgehäuse und führt zu den oben erläuterten Problemen.That's why it was already in the generic DE 10 2006 045 589 A1 proposed, at an interruption of the spinning process before opening the rotor housing in the drive housing by supplying compressed air to perform a pressure compensation at least to the ambient pressure. By this measure it is achieved that when opening the rotor housing dust and / or fiber material is not in the drive housing be sucked in. In this way, however, it is not possible to prevent dust and / or fiber material from depositing in the region of the rotor shaft during the spinning process behind the rotor cup. This can not lead to problems only when opening the rotor housing in an interruption of the spinning operation, but already during the spinning process. With a corresponding volume of the dust and / or fiber material this passes without a corresponding movement of air from the rotor housing in the drive housing and leads to the problems discussed above.

Staub und/oder Fasermaterial kann jedoch nicht nur durch die Verbindungsöffnung zwischen Antriebsgehäuse und Rotorgehäuse eindringen. Selbst wenn das Antriebsgehäuse entsprechend abgedichtet ist, können an Übergangsstellen zwischen Gehäuseteilen Staub und Fasern in das Antriebsgehäuse eindringen. Eine hundertprozentige Abdichtung ist nicht möglich. Die Belastung mit Staub und Fasermaterial ist beim Betrieb der Spinnvorrichtung besonders hoch, da beim Betrieb das verarbeitete Faserband und das gesponnene Garn bewegt werden.However, dust and / or fiber material can not only penetrate through the connection opening between the drive housing and the rotor housing. Even if the drive housing is sealed accordingly, dust and fibers can penetrate into the drive housing at transition points between housing parts. A hundred percent sealing is not possible. The load with dust and fiber material is particularly high during operation of the spinning device, since in operation, the processed sliver and the spun yarn are moved.

Die CH 571 582 A5 offenbart eine gattungsfremde Spinnvorrichtung. Der Spinnrotor wird einzeln mittels einer pneumatischen Turbine angetrieben und wird mittels eines Luftlagers gelagert. Dabei wird komprimierte Luft von einer äußeren Quelle der Turbine zugeleitet. Die aus der Turbine austretende Luft wird via einen Kanal in das Luftlager geleitet, in welchem die Luft mittels einer Mehrzahl von Durchlässen verteilt wird und über eine Mehrzahl von Luftzuleitungskanälen in den Spalt zwischen Rotorwelle und einem zylindrischen, die Rotorwelle umhüllenden Tragkörper des Lagers gelangt. Die Luft tritt über Austrittsöffnungen kontinuierlich aus dem Lager aus. Für die Lagerung ist es erforderlich, dass die Luft in dem Lager während des gesamten Spinnbetriebes in Bewegung ist. Der dadurch entstehende dynamische Überdruck sorgt als Nebeneffekt dafür, dass keine staub- und/oder faserhaltige Luft aus dem Gehäuse mit dem Spinnrotor in das Lagergehäuse eindringt. Ebenfalls um das Eindringen von staub- und/oder faserhaltiger Luft in das Lager zu verhindern, ist in der Wellendurchgangsöffnung zwischen Rotorgehäuse und Lagergehäuse zusätzlich eine Labyrinth-Dichtung angeordnet. Vorzugsweise soll dazu eine konische Labyrinth-Dichtung verwendet werden, so dass eine schwache Strömung in das Rotorgehäuse mündet. Da die Luft in dem Lager ständig in Bewegung sein muss, sind der Druckluftverbrauch und damit der Energieverbrauch einer solchen Anordnung relativ hoch.The CH 571 582 A5 discloses a non-generic spinning device. The spinning rotor is driven individually by means of a pneumatic turbine and is supported by means of an air bearing. In this case, compressed air is supplied from an external source of the turbine. The air emerging from the turbine is conducted via a channel into the air bearing, in which the air is distributed by means of a plurality of passages and passes through a plurality of air supply ducts in the gap between the rotor shaft and a cylindrical, the rotor shaft enclosing support body of the bearing. The air exits through outlets continuously from the camp. For storage, it is necessary that the air in the bearing is in motion throughout the spinning operation. The resulting dynamic overpressure as a side effect ensures that no dust and / or fiber-containing air from the housing with the spinning rotor penetrates into the bearing housing. Also to prevent the ingress of dust and / or fiber-containing air into the bearing, a labyrinth seal is additionally arranged in the shaft passage opening between the rotor housing and the bearing housing. Preferably, a conical labyrinth seal should be used, so that a weak flow opens into the rotor housing. Because the air in the warehouse must be constantly in motion, the compressed air consumption and thus the energy consumption of such an arrangement are relatively high.

Ausgehend von der DE 10 2006 045 589 A1 ist es die Aufgabe der vorliegenden Erfindung, das Eindringen von Staub- und/oder Fasermaterial in das Antriebsgehäuse eines magnetisch gelagerten Rotors nicht nur bei einer Spinnunterbrechung, sondern auch während des Spinnbetriebes energiesparend zu verhindern.Starting from the DE 10 2006 045 589 A1 It is the object of the present invention to prevent the penetration of dust and / or fiber material in the drive housing of a magnetically mounted rotor energy-saving not only in a spinning break, but also during spinning operation.

Die Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Verfahrensanspruches 1, der Rotorspinnmaschine gemäß Anspruch 2 sowie der Spinnvorrichtung gemäß Anspruch 3 gelöst.The object is achieved by the characterizing features of the method claim 1, the rotor spinning machine according to claim 2 and the spinning device according to claim 3.

Zur Lösung der Aufgabe wird das Antriebsgehäuse sowohl während des Spinnprozesses als auch bei einer Unterbrechung des Spinnprozesses derart mit Druckluft beaufschlagt, dass zumindest während des Spinnprozesses in dem Antriebsgehäuse ein statischer Überdruck gegenüber dem Umgebungsdruck herrscht, wobei die Verbindungsöffnung mittels einer Labyrinth-Dichtung abgedichtet ist.In order to achieve the object, the drive housing is subjected to compressed air both during the spinning process and during an interruption of the spinning process such that a static overpressure relative to the ambient pressure prevails in the drive housing at least during the spinning process, wherein the connection opening is sealed by means of a labyrinth seal.

Erfindungsgemäß wird das Antriebsgehäuse nicht nur bei einer Spinnunterbrechung, sondern auch während des Spinnprozesses mit Druckluft beaufschlagt. Der dadurch entstehende Überdruck im Antriebsgehäuse verhindert sicher ein Eindringen von Schmutz und Fasermaterial in das Antriebsgehäuse. Um zu verhindern, dass durch die Verbindungsöffnung zwischen dem Antriebsgehäuse und dem Rotorgehäuse übermäßig Luft entweicht, ist die Verbindungsöffnung mittels einer Labyrinth-Dichtung abgedichtet. Labyrinth-Dichtungen sind im Stand der Technik im Prinzip bekannt. Es handelt sich um eine berührungsfreie Wellendichtung, so dass auch bei hohen Drehzahlen kein Verschleiß durch Reibung entsteht. Die Dichtwirkung beruht auf strömungstechnischen Effekten durch die Verlängerung des abzudichtenden Spaltes. Die Dichtwirkung hängt dabei von der Drehzahl der Welle ab. Eine weitestgehende Abdichtung wird bei rotierender Welle erreicht. Bei einer stehenden Welle ist die Dichtwirkung gering. Im Spinnbetrieb mit rotierendem Spinnrotor wird das Antriebsgehäuse gegenüber dem Rotorgehäuse also zuverlässig abgedichtet. Somit entweicht im Wesentlichen keine Luft aus dem Antriebsgehäuse. Im Antriebsgehäuse herrscht somit ein statischer Überdruck. Der Energieverbrauch für die Druckluftbeaufschlagung ist deshalb gering. Bei einer Spinnunterbrechung und damit stehendem Rotor lässt die Dichtwirkung der Labyrinth-Dichtung nach. Damit strömt Luft durch die Verbindungsöffnung von dem Antriebsgehäuse in das Rotorgehäuse. Faserreste, die sich möglicherweise in dem Rotorgehäuse im Bereich hinter der Rotortasse angesammelt haben, werden ausgeblasen und können von der Unterdruckversorgung des Rotorgehäuses abgesaugt werden.According to the invention, the drive housing is subjected to compressed air not only during a spinning interruption but also during the spinning process. The resulting overpressure in the drive housing reliably prevents dirt and fiber material from entering the drive housing. In order to prevent excessive air from escaping through the communication opening between the drive housing and the rotor housing, the connection opening is sealed by means of a labyrinth seal. Labyrinth seals are known in the art in principle. It is a non-contact shaft seal, so that even at high speeds no wear due to friction occurs. The sealing effect is based on fluidic effects by the extension of the gap to be sealed. The sealing effect depends on the speed of the shaft. A most extensive seal is achieved with a rotating shaft. In a standing wave, the sealing effect is low. In spinning operation with a rotating spinning rotor, the drive housing is thus reliably sealed against the rotor housing. Thus, essentially no air escapes from the drive housing. The drive housing thus has a static overpressure. The energy consumption for the compressed air supply is therefore low. At a spinning break and thus standing rotor lets the sealing effect of the labyrinth seal after. As a result, air flows through the connection opening from the drive housing into the rotor housing. Fiber remnants, which may have accumulated in the rotor housing in the area behind the rotor cup, are blown out and can be sucked by the vacuum supply of the rotor housing.

Zur Lösung der Aufgabe wird ferner eine Rotorspinnmaschine mit einer Spinnvorrichtung vorgeschlagen, bei der zwischen der Verbindungsöffnung und dem Rotorschaft eine Labyrinth-Dichtung angeordnet ist und bei der die Steuereinrichtung dazu ausgebildet ist, die Druckluftquelle so anzusteuern, dass das Antriebsgehäuse sowohl während des Spinnprozesses als auch bei einer Unterbrechung des Spinnprozesses derart mit Druckluft beaufschlagt wird, dass zumindest während des Spinnprozesses in dem Antriebsgehäuse ein statischer Überdruck gegenüber dem Umgebungsdruck herrscht.To solve the problem, a rotor spinning machine with a spinning device is further proposed, in which between the connection opening and the rotor shaft a labyrinth seal is arranged and in which the control device is adapted to control the compressed air source so that the drive housing both during the spinning process as well is acted upon in such a compressed air at an interruption of the spinning process that at least during the spinning process in the drive housing, a static pressure over the ambient pressure prevails.

Die Erfindung betrifft ferner die Spinnvorrichtung, bei der zwischen der Verbindungsöffnung und dem Rotorschaft eine Labyrinth-Dichtung angeordnet ist.The invention further relates to the spinning device in which a labyrinth seal is arranged between the connection opening and the rotor shaft.

Die Erfindung wird nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert.The invention will be explained in more detail with reference to an embodiment shown in the drawings.

Es zeigen:

Fig. 1
eine schematische Ansicht einer Spinnstelle einer Rotorspinnmaschine
Fig. 2
eine Schnittansicht des vorderen Teiles eines einen Spinnrotor und dessen Antrieb umgebenden Gehäuses.
Show it:
Fig. 1
a schematic view of a spinning station of a rotor spinning machine
Fig. 2
a sectional view of the front part of a spinning rotor and its drive surrounding housing.

In Fig. 1 ist eine schematische Ansicht einer Spinnstelle 1 einer Rotorspinnmaschine dargestellt. Die Steuereinrichtung 4 dient der Steuerung des Spinnprozesses an der Spinnstelle 1.In Fig. 1 is a schematic view of a spinning station 1 of a rotor spinning machine shown. The control device 4 serves to control the spinning process at the spinning station 1.

Die an der Spinnstelle 1 angeordnete Spinnvorrichtung 3 umfasst, wie in Figur 2 dargestellt, einen Spinnrotor 16, dessen Spinntasse 10 mit hoher Drehzahl in einem Rotorgehäuse 9 umläuft. Der Antrieb des Spinnrotors 16 erfolgt durch einen elektrischen Einzelantrieb 20. Der Spinnrotor 16 ist mit seinem als Läufer 11 des Einzelantriebes 20 ausgeführten Rotorschaftes sowohl radial als auch axial in einer magnetischen Lagerung 21 berührungslos gelagert. Das Rotorgehäuse 9 ist während des Spinnvorgangs durch ein schwenkbar gelagertes Deckelelement 14 verschlossen. Das Deckelelement 14 und das Rotorgehäuse 9 weisen zum Öffnen und Schließen eine Verriegelungsvorrichtung auf, die sowohl durch ein Serviceaggregat als auch das Bedienpersonal betätigbar ist.The spinning device 3 arranged at the spinning station 1 comprises, as in FIG FIG. 2 shown, a spinning rotor 16, the spinning cup 10 at high speed in a rotor housing 9 rotates. The spinning rotor 16 is driven by an electric single drive 20. The spinning rotor 16 is mounted without contact with its rotor shaft designed as a rotor 11 of the single drive 20 both radially and axially in a magnetic bearing 21. The rotor housing 9 is closed during the spinning process by a pivotally mounted cover element 14. The lid member 14 and the rotor housing 9 have to open and close a locking device which is actuated by both a service unit and the operator.

Die Darstellung in Fig. 2 zeigt eine Schnittansicht des Rotorgehäuses 9, das Bestandteil der Spinneinrichtung 3 ist.
Der einzelmotorisch angetriebene Spinnrotor 16 umfasst eine Rotortasse 10, die an einem als Läufer 11 des einzelmotorischen Antriebs 20 ausgebildeten Rotorschaft angeordnet ist. Der Läufer 11 ist radial und axial berührungslos in einer Magnetlageranordnung 21 gelagert. In der Fig. 2 ist die Magnetlagerung 21 nur angedeutet. Es sind ein am Stator des Einzelantriebes befestigter Magnetring 22 mit einer Dämpfungswicklung 23 und ein mit dem Rotorschaft 11 rotierender Magnetring 24 dargestellt. Die Magnetlagerung 21 weist außerdem am hinteren Ende des Rotorschafts eine vergleichbare, hier nicht dargestellte Anordnung auf. Weitere Einzelheiten einer berührungslosen Spinnrotorlagerung und auch des elektrischen Einzelantriebes sind zum Beispiel der DE 198 19 767 A1 oder der eingangs genannten EP 0 972 868 A2 entnehmbar.The representation in Fig. 2 shows a sectional view of the rotor housing 9, which is part of the spinning device 3.
The single-motor driven spinning rotor 16 comprises a rotor cup 10, which is arranged on a rotor shaft 11 designed as a rotor 11 of the single-motor drive. The rotor 11 is mounted radially and axially contactless in a magnetic bearing assembly 21. In the Fig. 2 the magnetic bearing 21 is only hinted at. There are shown a fixed to the stator of the single drive magnetic ring 22 with a damping winding 23 and a rotating with the rotor shaft 11 magnet ring 24. The magnetic bearing 21 also has at the rear end of the rotor shaft a comparable arrangement, not shown here. Further details of a non-contact spinning rotor bearing and the electric single drive are, for example, the DE 198 19 767 A1 or the aforementioned EP 0 972 868 A2 removable.

An das Rotorgehäuse 9 schließt sich ein Antriebsgehäuse 15 an, das mit dem Rotorgehäuse 9 verbunden ist. Das Antriebsgehäuse 15 umgibt die Magnetlageranordnung sowie den Läufer 11, der sich durch eine Verbindungsöffnung 17 zwischen dem Antriebs- und dem Rotorgehäuse in das Innere des Rotorgehäuses 9 erstreckt, um die Rotortasse 10 aufzunehmen. Eine Labyrinth-Dichtung 18 dichtet die Verbindungsöffnung 17 ab. Die Labyrinth-Dichtung 18 ist dazu im Bereich des Ringspaltes zwischen dem Rotorschaft 11 und der Verbindungsöffnung 17 angeordnet.To the rotor housing 9, a drive housing 15 connects, which is connected to the rotor housing 9. The drive housing 15 surrounds the magnetic bearing assembly and the rotor 11, which extends through a connection opening 17 between the drive and the rotor housing in the interior of the rotor housing 9 to receive the rotor cup 10. A labyrinth seal 18 seals the connection opening 17. The labyrinth seal 18 is arranged in the region of the annular gap between the rotor shaft 11 and the connection opening 17.

Das Antriebsgehäuse 15 ist mit den Lufteinlass 12 versehen, der in ein im Wesentlichen ringförmiges Stauvolumen 13 mündet. Der Lufteinlass 12 ist über eine Zuleitung 7 mit einer Druckluftquelle 6 verbunden. Die Druckluftquelle 6 steht ihrerseits über eine Steuerleitung 8 mit der Steuereinrichtung 4 in Verbindung und ist über diese ansteuerbar. In dem darstellten Ausführungsbeispiel wird die Druckluftquelle 6 von der gleichen Steuereinrichtung 4 angesteuert wie der Spinnprozess an der Spinnstelle 1. Alternativ kann die Druckluftquelle 6 aber auch von einer eigenen oder von einer zentralen Steuereinrichtung angesteuert werden. Zur Einstellung der Druckluft der Druckluftquelle 6 kann sich die Steuereinrichtung 4 beispielsweise eines nicht dargestellten Ventils bedienen.The drive housing 15 is provided with the air inlet 12, which opens into a substantially annular storage volume 13. The air inlet 12 is connected via a supply line 7 with a compressed air source 6. The compressed air source 6 is in turn connected via a control line 8 to the control device 4 in connection and can be controlled via this. In the illustrated embodiment, the compressed air source 6 is controlled by the same control device 4 as the spinning process at the spinning station 1. Alternatively, the compressed air source 6 can also be controlled by its own or by a central control device. For adjusting the compressed air of the compressed air source 6, the control device 4 can operate, for example, a valve, not shown.

Während des Spinnprozesses ist das Deckelelement 14 geschlossen und das Rotorgehäuse 9 wird mittels einer nicht dargestellten Unterdruckquelle mit Unterdruck beaufschlagt. Gleichzeitig wird die Druckluftquelle 6 von der Steuereinrichtung 4 so angesteuert, dass das Antriebsgehäuse 15 mit Druckluft beaufschlagt wird. Die Druckluft ist dabei so eingestellt, dass in dem Antriebsgehäuse 15 nicht nur ein Überdruck gegenüber dem Luftdruck im Rotorgehäuse 9 herrscht, sondern es wird in dem Antriebsgehäuse 15 ein Überdruck gegenüber dem Umgebungsdruck erzeugt. Die Luft in der Umgebung von Textilmaschinen ist normalerweise stark mit Staub und Faserflug belastet. Durch den Überdruck wird verhindert, dass Staub und/oder Faserflug in das Antriebsgehäuse 15 eindringen kann. Die Labyrinth-Dichtung 18 verhindert, solange sich der Spinnrotor dreht, dass ein Druckausgleich zwischen dem Rotorgehäuse 9 in dem Antriebsgehäuse 15 stattfindet. In dem Antriebsgehäuse 15 findet somit keine nennenswerte Luftbewegung statt. Somit herrscht im Antriebsgehäuse ein im Wesentlichen statischer Überdruck. Der Energieverbrauch für die Druckluftbereitstellung ist damit gering. Erst bei einer Spinnunterbrechung, wenn der Spinnrotor 16 zum Stillstand kommt, lässt die Dichtwirkung der Labyrinth-Dichtung 18 nach. Es kommt damit durch die Verbindungsöffnung 17 zu einem Druckausgleich zwischen dem Antriebsgehäuse 15 und dem Rotorgehäuse 9. Der Luftstrom von dem Antriebsgehäuse 15 zum Rotorgehäuse 9 verhindert, dass Staub oder Faserreste aus dem Rotorgehäuse 9 in das Antriebsgehäuse 15 eindringen. Die zugeführte Druckluft braucht in diesem Stadium nicht unbedingt erhöht zu werden. Wenn man die Druckluftzufuhr konstant hält, nimmt der statische Druck in dem Antriebsgehäuse 15 zugunsten des dynamischen Druckes ab. Alternativ kann die Druckluftzufuhr erhöht und der statische Druck in dem Antriebsgehäuse konstant gehalten werden. Spinnunterbrechungen sind in der Regel kurz, so dass der Energieverbrauch nicht wesentlich erhöht wird.During the spinning process, the lid member 14 is closed and the rotor housing 9 is acted upon by means of a vacuum source, not shown, with negative pressure. At the same time the compressed air source 6 is controlled by the control device 4 so that the drive housing 15 is acted upon by compressed air. The compressed air is adjusted so that in the drive housing 15 not only an overpressure against the air pressure prevails in the rotor housing 9, but it is generated in the drive housing 15, an overpressure relative to the ambient pressure. The air in the vicinity of textile machinery is usually heavily contaminated with dust and fiber fly. The overpressure prevents dust and / or fiber fly can penetrate into the drive housing 15. The labyrinth seal 18 prevents, as long as the spinning rotor rotates, that a pressure equalization takes place between the rotor housing 9 in the drive housing 15. In the drive housing 15 thus no appreciable air movement takes place. Thus, there is a substantially static overpressure in the drive housing. The energy consumption for the compressed air supply is thus low. Only when a spinning break, when the spinning rotor 16 comes to a standstill, the sealing effect of the labyrinth seal 18 after. It comes so through the connection opening 17 to a pressure equalization between the drive housing 15 and the rotor housing 9. The air flow from the drive housing 15 to the rotor housing 9 prevents dust or fiber residues from penetrating the rotor housing 9 in the drive housing 15. The supplied compressed air does not necessarily need to be increased at this stage. By keeping the compressed air supply constant, the static pressure in the drive housing 15 decreases in favor of the dynamic pressure. Alternatively, the compressed air supply can be increased and the static pressure in the drive housing can be kept constant. Spider breaks are usually short, so energy consumption is not significantly increased.

Claims (3)

  1. Method for operating a spinning device (3) of a rotor spinning machine, wherein a spinning rotor (16) with a rotor cup (10) and a rotor shaft (11) is set into rotation by an electric single drive (20), which is arranged in a drive housing (15) and the electric single drive (20) is in operative connection with the rotor shaft (11), wherein the rotor shaft (11) is supported by means of a magnet bearing arrangement (21), which is also arranged in the drive housing (15), a rotor housing (9), in which the rotor cup (10) is arranged, is charged with negative pressure during the spinning operation and the rotor shaft extends through a connection opening (17) between the drive housing (15) and the rotor housing (9),
    characterised in that
    the drive housing (15) is charged with compressed air both during the spinning process and on an interruption of the spinning process such that at least during the spinning process in the drive housing (15) there is a prevailing static overpressure compared to environmental pressure, wherein the connection opening (17) is sealed by means of a labyrinth seal (18).
  2. Rotor spinning machine with a plurality of spinning units (1), which each comprise a spinning device (3), the spinning device (3) comprising
    - a spinning rotor (16) with a rotor cup (10) and a rotor shaft (11),
    - an electric single drive (20), which is designed to set the spinning rotor (16) in rotation and for this is in operative connection with the rotor shaft (11),
    - a magnet bearing arrangement (21) for supporting the rotor shaft (11),
    - a rotor housing (15), which can be charged with negative pressure and in which the rotor cup (10) is arranged,
    - a drive housing (15), in which the electric single drive (20) and the magnet bearing arrangement (21) are arranged and which comprises an air inlet (12) for supplying compressed air into the drive housing (15),
    - a connection opening (17) between the drive housing (15) and the rotor housing (9), through which the rotor shaft (11) extends, wherein the rotor spinning machine has a source of compressed air (6), which is connected to the air inlet (12), and a control device (4) for controlling the source of compressed air (6), characterised in that
    between the connection opening (17) and the rotor shaft (11) a labyrinth seal (18) is arranged and
    in that the control device (4) is designed to control the source of compressed air (6) so that the drive housing (15) is pressurised with compressed air both during the spinning process and on an interruption of the spinning process such that at least during the spinning process in the drive housing (15) there is a static overpressure compared to the environmental pressure.
  3. Spinning device (3) for a rotor spinning machine comprising
    - a spinning rotor (16) with a rotor cup (10) and a rotor shaft (11),
    - an electric single drive (20), which is designed to set the spinning rotor (16) in rotation and for this is in operative connection with the rotor shaft (11),
    - a magnet bearing arrangement (21) for supporting the rotor shaft (11),
    - a rotor housing (9), which can be charged with negative pressure and in which the rotor cup (10) is arranged,
    - a drive housing (15), in which the electric single drive (20) and the magnet bearing arrangement (21) is arranged and which comprises an air inlet (12) for supplying compressed air into the drive housing (15),
    - a connection opening (17) between the drive housing (15) and the rotor housing (9), through which the rotor shaft (11) extends, characterised in that
    between the connection opening (17) and the rotor shaft (11) a labyrinth seal (18) is arranged.
EP13003141.2A 2012-08-02 2013-06-20 Method for operating a spinning device, rotor spinning machine with a spinning device and spinning device Not-in-force EP2692916B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012015420.8A DE102012015420A1 (en) 2012-08-02 2012-08-02 A method of operating a spinning device, rotor spinning machine comprising a spinning device and spinning device

Related Parent Applications (1)

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DE102012015420 Previously-Filed-Application 2012-08-02

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DE102014108526A1 (en) * 2014-06-17 2015-12-17 Maschinenfabrik Rieter Ag Open-end spinning device with an intermediate chamber
DE102014119380A1 (en) * 2014-12-22 2016-06-23 Rieter Ingolstadt Gmbh Rotor spinning machine with a variety of jobs and a suction device
CZ2015321A3 (en) * 2015-05-14 2016-12-21 Rieter Cz S.R.O. Method of mass yarn spinning on workstations of rotor spinning machine and apparatus for making the same
DE102015121963A1 (en) * 2015-12-16 2017-06-22 Rieter Ingolstadt Gmbh Open-end spinning device with an air supply
DE102016120989A1 (en) * 2016-11-03 2018-05-03 Rieter Ingolstadt Gmbh An open-end spinning device and method of operating an open-end spinning device
DE102016123698A1 (en) * 2016-12-07 2018-06-07 Saurer Germany Gmbh & Co. Kg Spinning rotor for an open-end spinning device and open-end spinning device
DE102017123279A1 (en) * 2017-10-06 2019-04-11 Maschinenfabrik Rieter Ag Rotor spinning machine with at least one air line for supplying ambient air into a bearing housing and spinning device of a rotor spinning machine
DE102018103876A1 (en) 2018-02-21 2019-08-22 Maschinenfabrik Rieter Ag Method for operating a spinning device of a rotor spinning machine and spinning device of a rotor spinning machine

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CH622291A5 (en) * 1976-09-09 1981-03-31 Rieter Ag Maschf
CS205913B1 (en) * 1979-04-28 1981-05-29 Oldrich Tesar Open-end spinning machine
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DE4241507A1 (en) * 1992-12-10 1994-06-16 Schurr Stahlecker & Grill Open-end spinning rotor shaft bearing mountings - has porous sintered bodies as bearing surfaces for aerostatic radial and thrust bearings
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JP5526915B2 (en) * 2010-03-25 2014-06-18 村田機械株式会社 Pneumatic spinning device and spinning machine

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EP2692916A2 (en) 2014-02-05
CN103572417B (en) 2017-07-28
CN103572417A (en) 2014-02-12
EP2692916A3 (en) 2015-05-06

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