EP2957662B1 - Open end spinning machine with an intermediate chamber - Google Patents

Open end spinning machine with an intermediate chamber Download PDF

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Publication number
EP2957662B1
EP2957662B1 EP15171887.1A EP15171887A EP2957662B1 EP 2957662 B1 EP2957662 B1 EP 2957662B1 EP 15171887 A EP15171887 A EP 15171887A EP 2957662 B1 EP2957662 B1 EP 2957662B1
Authority
EP
European Patent Office
Prior art keywords
rotor
spinning
housing
intermediate chamber
open
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15171887.1A
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German (de)
French (fr)
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EP2957662A1 (en
Inventor
Josef Schermer
Mathias Burchert
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Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
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Publication of EP2957662A1 publication Critical patent/EP2957662A1/en
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    • 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
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H11/00—Arrangements for confining or removing dust, fly or the like
    • D01H11/005—Arrangements for confining or removing dust, fly or the like with blowing and/or suction devices
    • 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

Definitions

  • the present invention relates to an open-end spinning device of a rotor spinning machine with a spinning rotor, which has a rotor cup, in which a fiber material is spinnable, and a rotor shaft, via which the spinning rotor is drivable and preferably stored without contact in a storage. Furthermore, the open-end spinning device has a drive for driving the spinning rotor, and a rotor housing, in which the rotor cup of the spinning rotor is arranged and which is acted upon during the spinning operation via a vacuum channel of the spinning station with a spinning vacuum.
  • the shaft of the spinning rotors in each case penetrates the rear wall of the rotor housing and is held on the rear side of the rotor housing in a bearing.
  • the spinning rotors of this spinning machine are driven by means of a central drive, which is arranged at one of the two front ends of the spinning machine and drives the individual spinning rotors via a machine-tangential belt.
  • the tangential belt, the bearings and the shafts of the spinning rotors are housed in a running in the longitudinal direction of the spinning machine channel.
  • an air supply duct is provided between the duct and the rotor housings, via which ambient air can be sucked into the duct containing the bearing.
  • contactless bearings such as magnetic bearings and air bearings have become known in addition to the storage in a wedge gap of support discs.
  • Such mounted rotors are usually driven by an electric motor single drive.
  • the under pressure in operation rotor housing is with a removable Cover closed to allow access to the rotor housing in certain situations. For example, it is necessary in an interruption of the spinning process by yarn break or a cleaning step to open the rotor housing to perform various maintenance activities. It also happens that the rotor housing is opened even during ongoing operation of operating personnel.
  • the open-end spinning device has a drive housing in which the rotor shaft of the spinning rotor extends.
  • the storage and the drive are arranged in the drive housing largely separated from the rotor housing, on the one hand to keep the volume of the rotor housing to be acted upon by spinning vacuum as small as possible and on the other hand to protect the drive and storage of the spinning rotor from contamination by dust and fly. Due to the spinning at very high speeds spinning rotor but no complete sealing of the rotor housing to the drive housing is possible, so that builds up a negative pressure in the drive housing during spinning operation.
  • the EP 1 156 142 B1 shows, for example, an open-end spinning device with such a single driven and magnetically mounted spinning rotor.
  • the EP 2 069 562 A1 proposes, therefore, to provide the drive housing with an additional air inlet and to supply compressed air to the drive housing before opening the rotor housing in order to perform pressure equalization there before opening the rotor housing. This will be the Suction of impurities when opening the rotor housing avoided.
  • the drive housing with a filter provided with an opening through which the drive housing ambient air is supplied. Due to the annular gap between the rotor housing and the drive housing negative pressure prevails in the drive housing, so that an air flow from the environment is generated by the drive housing in the rotor housing, which prevents the accumulation of contaminants behind the rotor cup.
  • the drive housing has a third opening, via which it can be acted upon by the compressed air when the spinning device is stationary.
  • the object of the present invention is to propose an open-end spinning device in which, at least when the rotor housing is opened, the suction of contaminants into the drive housing is avoided and which can be used with different types of bearings.
  • An open-end spinning device of a rotor spinning machine has a spinning rotor with a rotor cup, in which a fiber material is spinnable, and with a rotor shaft, via which the spinning rotor is drivable and is preferably mounted without contact in a bearing on. Furthermore, the open-end spinning device has a single drive, for driving the spinning rotor, a rotor housing, in which the rotor cup of the spinning rotor is arranged and which is acted upon during the spinning operation via a vacuum channel of the spinning station with a spinning vacuum, and a drive housing, in which the rotor shaft of the spinning rotor extends and in which the drive and the storage of the spinning rotor are arranged on. It is envisaged that the rotor housing and the drive housing spaced apart in an axial direction of the rotor shaft in the open-end spinning device.
  • the housing directly surrounding the rotor or the individual drive is each formed by a front and a rear boundary wall and either a circumferential side wall (for example, in the case of a cylindrical housing) or a plurality of individual side walls.
  • the front boundary wall is in each case facing the withdrawal side of the spinning device and, in the case of the rotor housing, is formed by a removable cover, on which, as a rule, the draw-off nozzle of the spinning device is arranged.
  • the rear boundary wall however, in each case faces the drive side of the spinning device.
  • the rotor housing and / or the drive housing may also be connected to one another by a spacer, which ensures the spaced arrangement of the rotor housing and the drive housing to each other.
  • a spacer can also be integrally formed on the rotor housing and / or the drive housing.
  • a method for operating an open-end spinning device of a rotor spinning machine in which the open-end spinning device by means of a single drive, driven and preferably mounted in a bearing contactlessly mounted spinning rotor with a rotor cup and with a rotor shaft, and in which the rotor cup of the spinning rotor in a Rotor housing is arranged, the rotor housing is subjected during the spinning operation with spinning vacuum.
  • the rotor shaft of the spinning rotor extends in a drive housing, in which also the individual drive and the bearing of the spinning rotor are arranged.
  • an air flow from the rotor housing is avoided in the drive housing, characterized in that the rotor housing and the drive housing in a Axial direction of the rotor shaft spaced from each other in the open-end spinning device are arranged.
  • an intermediate chamber is arranged between the rotor housing and the drive housing, wherein the intermediate chamber has a first connection opening to the rotor housing and a second connection opening to the drive housing. Furthermore, the intermediate chamber has a third opening, via which the intermediate chamber communicates either with a negative pressure source or with ambient air pressure at least when the spinning operation is interrupted.
  • an intermediate chamber is arranged between the rotor housing and the drive housing, which communicates with the rotor housing via a first connection opening and with the drive housing via a second connection opening.
  • the shaft of the spinning rotor extends from the rotor housing into the drive housing.
  • the intermediate chamber is subjected to negative pressure or ambient air pressure, at least when the spinning operation is interrupted, such that an air flow into the drive housing is at least avoided when the rotor housing is opened.
  • an air flow from the drive housing is generated in the intermediate chamber.
  • the intermediate chamber is thus at least at the same time with the beginning of the opening of the rotor housing, but preferably already applied shortly before either with negative pressure or ambient air pressure.
  • the intermediate chamber remains at least as long as the interruption of the spinning process continues or as long as the rotor housing is open.
  • the arranged between the rotor housing and the drive housing intermediate chamber to prevent or at least largely avoided by the targeted pressurization of the intermediate chamber, an air flow and the associated suction of polluted air in the drive housing.
  • by applying the intermediate chamber with negative pressure can also be a targeted air flow generated by the intermediate chamber, which counteracts not only when opening the rotor housing a suction of dirt particles in the drive housing, but can also avoid deposits during operation.
  • the intermediate chamber can be designed both as a separate housing or be formed by an extension of the rotor housing or the drive housing or both housing.
  • the side wall or the side walls of the rotor housing may be extended beyond its rear boundary wall and thereby form the intermediate chamber.
  • the thus formed intermediate chamber is sealed by means of a seal against the adjacent drive housing.
  • the side wall or the side walls of the drive housing could be extended to beyond the front boundary wall also.
  • the first and / or the second connection opening are preferably arranged around the rotor shaft.
  • the first and / or the second connection opening are formed as an annular gap around the rotor shaft, since a complete seal of the housing to each other is usually not possible.
  • the first connection opening can thus also be designed as an annular gap around the rotor cup assembly.
  • a certain sealing of the housing or the intermediate chamber relative to each other can be achieved, which in particular makes it possible to maintain the spinning negative pressure in the rotor housing, and nevertheless a targeted air flow is formed through the annular gaps, which dissipates soiling.
  • the first connection opening is provided in the region of the collar of the rotor cup, then, at least in the case of an intermediate chamber subjected to negative pressure, any possible contamination from the coupling point between rotor shaft and rotor cup can be sucked off during the disassembly of the rotor cup.
  • the bearing includes an axial bearing acting on the end of the spinning rotor facing away from the rotor cup. This takes over the axial bearing of the spinning rotor, so that the radial bearing of the spinning rotor can be formed independently of this.
  • the design and control of the radial bearing is thereby compared to a design in which no separate thrust bearing is provided, simplified and the storage is less prone.
  • the axial bearing is designed as an axial air bearing or at least includes an axial air bearing, as this can support the formation of an air flow from the drive housing into the intermediate chamber.
  • the invention can also be used in an open-end spinning device, in which the axial bearing of the spinning rotor is designed as a magnetic bearing or in other ways.
  • the bearing includes a magnetic bearing, in particular a radial magnetic bearing.
  • the execution of the radial bearing of the spinning rotor is advantageous as a magnetic bearing. Since such magnetic bearings are particularly susceptible to contamination, the benefits of the formation of a targeted air flow using an intermediate chamber between the rotor housing and the drive housing there are particularly significant.
  • the intermediate chamber is at least when opening the rotor housing, but preferably already applied before opening the rotor housing with negative pressure.
  • the intermediate chamber has, in addition to the two connecting openings designed as an annular gap, a third opening which is in communication with a vacuum source.
  • the intermediate chamber is constantly subjected to negative pressure, that is to say also during the spinning operation, since the deposition and migration of contaminants can already be avoided during the spinning operation.
  • the intermediate chamber as well as the rotor housing is subjected to spinning negative pressure.
  • the intermediate chamber stands on the third opening directly to the vacuum channel of the open-end spinning device for the spinning vacuum in combination.
  • the intermediate chamber can be in communication with the vacuum channel, which also connects the rotor housing with the vacuum source or a machine-long vacuum line, or have its own vacuum channel to the vacuum source or to the machine-long vacuum line.
  • the third opening of the intermediate chamber may be provided in this case with a controllable shut-off device, which is preferably actuated by the opening and closing of the rotor housing.
  • a controllable shut-off device which is preferably actuated by the opening and closing of the rotor housing.
  • the opening of the rotor housing or a pivot housing connected to the rotor housing can be registered by a sensor, which in turn triggers the switching of the obturator.
  • a purely mechanical coupling of the obturator with the rotor housing is of course also possible.
  • the third opening is not connected to a vacuum source, but communicates only with the ambient air.
  • the intermediate chamber is constantly acted upon by the third opening with ambient air pressure or is in communication with ambient pressure.
  • the ambient air pressure avoided in the intermediate chamber due to the ambient air pressure avoided in the intermediate chamber, the emergence of a negative pressure in the drive housing during the spinning operation. Therefore, no air is sucked into the drive housing even when the rotor housing is opened.
  • This embodiment of the invention can be used both with a magnetic bearing and with an air bearing or with a combined storage. It is also possible to metered via the third opening of the intermediate chamber supply only a small amount of air, which is barely sufficient to prevent the suction of dust from the rotor housing in the intermediate chamber or in the drive housing.
  • this can also be supplied to the rotor housing a very small amount of air, which prevents deposits in the rotor housing behind the rotor cup from the outset. It can thus no longer get into the drive housing when opening the rotor housing and thereby taking place there pressure increase.
  • the amount of air supplied can be controlled by the size of the third opening. It turns in this case in the intermediate chamber and due to the connection opening to the drive housing in the drive housing, a pressure that is higher than the spinning vacuum in the rotor housing, but still due to the low amount of air supplied below the ambient air pressure.
  • the ambient air is filtered before it is fed into the intermediate chamber.
  • the third opening is preferably provided with an air filter.
  • the bearing of the spinning rotor has an air bearing, it is advantageous for carrying out the method if the air flow through the air bearing is controlled in such a way that there is always a greater pressure in the drive housing than in the intermediate chamber. It can thereby both at one with Negative pressure as well as at an acted upon by ambient air pressure intermediate chamber not only the suction of air and dirt in the drive housing when opening the rotor housing can be avoided, but it is also avoided during the spinning operation, the ingress of dirt into the drive housing. Namely, such contamination can also occur during normal spinning operation without active suction of polluted air due to the imperfect seal in the region of the annular gaps.
  • FIG. 1 shows a schematic representation of an open-end spinning device 1 of a rotor spinning machine 2 in a schematic side view.
  • the rotor spinning machine 2 includes in a conventional manner a feed device 8, which the open-end spinning device 1, a fiber material 6 via a dissolving device 9, which dissolves the fiber material into individual fibers, supplies.
  • the fiber material 6 in a rotor cup 4 spun a spinning rotor 3 to a yarn 7, withdrawn via a take-off device 10 and wound with a winding device 11 on a spool 12.
  • the open-end spinning device 1 comprises in addition to the spinning rotor 3 with the rotor cup 4 and the rotor shaft 5 (see Figures 2 - 6 ), a rotor housing 15, in which the rotor cup 4 is arranged, and a drive housing 17, in which the shaft 5 of the spinning rotor 3 extends.
  • the spinning rotor 3 is driven by the present illustration by means of a single drive 14 and stored in a bearing 13.
  • the bearing 13 includes radial bearings 25 and may also include a separately formed from the radial bearings 25 thrust bearing 24.
  • the thrust bearing 24 may be formed as Axialluftlager 24a or as Axialmagnetlager or be formed by a combination of these two types of storage. Also in the open-end spinning devices 1 of the following Figures 2 - 6 Deviating from the types of storage shown in each case, another type of storage can alternatively or additionally be used. For reasons of clarity, in the present case only the bearing 13 is labeled without its individual components.
  • the rotor housing 15 is closed by means of a removable, in particular pivotable, cover 27 (see arrow).
  • the lid 27 of the rotor housing 15 can be removed both by an automatic maintenance device as well as by an operator, as symbolized by the arrow.
  • the cover 27 of the rotor housing 15 is connected to a swing-pivot housing 29, and can be opened together with this.
  • the rotor housing 15 is acted upon via a vacuum channel 16 of the open-end spinning device 1 with a spinning negative pressure p SU required for the spinning process.
  • the vacuum channel 16 of the open-end spinning device 1 is connected to a machine-length vacuum line 33, which in turn communicates with a central negative pressure source 23.
  • a seal 28 is arranged between the cover 27 of the rotor housing 15 and the rotor housing 15.
  • the rotor shaft 5 of the spinning rotor 3 thus extends from the rotor housing 15 into the drive housing 17.
  • the drive housing 17 is now no longer in direct communication with the rotor housing 15, but only with a not sealed against the ambient air pressure p U area of the open-end spinning device 1. It is thus constructed during the spinning operation no negative pressure in the drive housing 17, so that too when opening the rotor housing 15 no dirt can be sucked into the drive housing 17. It is advantageous if the two housings 15 and 17 by a distance of at least 3 mm, preferably at least 5 mm, more preferably at least 10 mm to each other to avoid the effects of prevailing in the rotor housing 15 negative pressure on the drive housing 17 safely.
  • an intermediate chamber 18 is provided between the rotor housing 15 and spaced therefrom arranged drive housing 17, an intermediate chamber 18 is provided.
  • Such an open-end spinning device 1 with the rotor housing 15 and the drive housing 17 will be described below with reference to FIG Figures 2 - 6 described in more detail, showing a detailed representation of an open-end spinning device 1 in various embodiments.
  • FIG. 2 in turn, the rotor 3 with the rotor cup 4 and the rotor shaft 5 can be seen. Furthermore, a discharge nozzle 34 arranged in the cover 27 of the rotor housing 15 can be seen, via which the yarn 7 produced in the rotor cup 4 is drawn off.
  • both the individual drive 14 and the mounting 13 can now be seen in detail.
  • two radial bearings 25 are provided which are designed as magnetic bearings 25a.
  • a thrust bearing 24 is provided which may include an axial magnetic bearing or an axial air bearing 24a or a thrust bearing 24 combined from both types of bearings.
  • an axial air bearing 24a which is fed via a compressed air source 31 and acts on a rotor cup 4 facing away from the end of the spinning rotor 3.
  • FIG. 2 removable, that in spite of the arrangement of ring seals 21 each have an annular gap between adjacent housings or chambers remains.
  • an intermediate chamber 18 is therefore arranged between the rotor housing 15 and the drive housing 17.
  • the intermediate chamber 18 is connected to the rotor housing via a connection opening 19 and via a second connection opening 20 to the drive housing 17.
  • an annular seal 21 is provided in each case in the region of the two annular gaps.
  • the intermediate chamber 18 now has a third opening 22 which is constantly in communication with a vacuum source 23.
  • the intermediate chamber 18 can be connected via the machine-length vacuum line 33 to the vacuum source 23 for the spinning vacuum p SU .
  • the intermediate chamber 18 is also connected to the vacuum channel 16 for this purpose.
  • the spinning vacuum p SU prevails in the rotor housing 15, while due to the axial bearing 24 designed as air bearing 24 a, a pressure P MG which is greater than the spinning vacuum p SU is established in the drive housing 17. Due to the very low air flow through the air bearing 24a compared to the air flow through the vacuum channel 16, however, the air pressure P MG is always below the spinning device 1 surrounding ambient air pressure P U also during spinning operation. Because of this, an air pressure P ZK sets in the intermediate chamber 18, which is also below the ambient air pressure P U and between the spinning vacuum P SU and the air pressure of the drive housing P AG is located. It is thus generated during the spinning operation, an air flow from the drive housing into the intermediate chamber, which prevents the penetration of contaminants into the drive housing 17 advantageously already during the spinning operation.
  • the described effect can be improved even if similar to the FIG. 3 the intermediate chamber 18 is connected via a separate vacuum channel 16a to the machine-length vacuum line 33 or another vacuum source 23. Due to the sudden pressure equalization in the rotor housing 15 to the ambient air pressure P U when opening the rotor housing 15, pressure equalization may also occur in the vacuum duct 16, so that the intermediate chamber 18 can no longer be sufficiently pressurized with negative pressure. By connecting the intermediate chamber 18 by means of its own vacuum channel 16a, the negative pressure (air pressure P ZK ) in the intermediate chamber 18 can still be maintained even after the rotor housing 15 has been opened.
  • the third opening 22 or the connection of the intermediate chamber 18 to the vacuum channel 16 close to the machine-length vacuum line 33 or to connect the intermediate chamber 18 directly to the machine-length vacuum line 33. In this area prevails due to the spatial proximity to the machine-length vacuum line 33 even when opening the rotor housing 15 is still a sufficient negative pressure.
  • FIG. 3 shows a modification of the open-end spinning device of FIG. 2 , It is therefore referred to below only to the differences from the device FIG. 2 received; the same elements and functions are no longer described separately.
  • the intermediate chamber 18 is connected via a third opening 22 to a vacuum source 23.
  • the intermediate chamber 18 is also connected via its own vacuum channel 16a with the vacuum source 23.
  • the intermediate chamber 18 could be connected directly to the machine-length vacuum line 33.
  • the third opening 22 is provided with a controllable obturator 26, so that the intermediate chamber 18 is not constantly in communication with the vacuum source 23, but only when opening the lid 27. Due to the connection openings 19 and 20 to the pressurized with spinning vacuum P SU rotor housing However, during the spinning operation, a negative pressure also occurs in the intermediate chamber 18 and in the drive housing 17. According to the present illustration, a sensor 32 is provided for this purpose either in the region of the cover 27 of the rotor housing 15 or in the region of the pivot housing 29, which registers the opening of the rotor housing 15, thereby opening the shut-off member 26.
  • the intermediate chamber 18 is thus further subjected to a negative pressure during opening of the cover 27 of the rotor housing 15, which prevents the suction of dirt into the drive housing 17. Any deposits from the area of the rotor housing 15 are also removed via the third opening 22 and the vacuum channel 16a after opening the obturator 26.
  • the intermediate chamber 18 is acted upon in each case with spinning vacuum P SU when opening the rotor housing 15, any impurities are sucked out of the rotor housing 15 via the vacuum channel 16a and no longer reach into the drive housing 17.
  • the penetration of impurities in the Drive housing 17 can thus be avoided in all types of storage.
  • the thrust bearing 24 is formed as Axialluftlager 24a or storage includes an air bearing. In this case prevails in the drive housing 17 is always a higher air pressure P AG than the air pressure P ZK in the intermediate chamber 18, which in turn the suction of impurities is avoided.
  • FIG. 4 shows a further modification of in FIG. 2 Open-end spinning device 1 shown with a vacuum-pressurized intermediate chamber 18, in which the intermediate chamber 18 communicates via the third opening 22 with the vacuum channel 16 of the rotor housing 15 in connection.
  • a separate vacuum channel 16a instead of a separate vacuum channel 16a, it can also be provided to close it against the vacuum channel 16 when the rotor housing 15 is opened.
  • the rotor housing 15 is for this purpose provided with a shut-off device 26 which blocks or releases its connection to the vacuum channel 16.
  • a purely mechanical coupling with the cover 27 of the rotor housing may be provided or it may be similar to FIG. 3 shown a sensor-controlled control done.
  • a slide 26 a is provided as a shut-off device 26, which alternately connects the rotor housing 15 and the intermediate chamber 18 to the vacuum passage 16.
  • the rotor housing 15 is connected to the vacuum channel 16, so that in the rotor housing 15 in the usual way, the spinning vacuum p su is maintained.
  • the intermediate chamber 18, however, is in regular spinning operation against the Vacuum channel 16 closed. Due to the connection opening 19 to the rotor housing but a negative pressure is still built up in the intermediate chamber.
  • the slider 26a is now controllable such that when opening the rotor housing 15, the connection of the rotor housing 15 is closed to the vacuum channel 16, while the third opening 22 is released and the intermediate chamber 18 is now in communication with the vacuum channel 16.
  • a Druckan Eisen to the ambient air pressure P U thus takes place only in the open rotor housing 15, but not in the vacuum channel 16, while the intermediate chamber 18 is now also applied via the third opening 22 with negative pressure.
  • FIG. 5 Another embodiment of an open-end spinning device 1 with a vacuum-loaded intermediate chamber 18, which in particular for storage can be used without axial air bearing 24a, is in FIG. 5 shown.
  • the intermediate chamber 18, as in FIG. 3 described connected by means of its own vacuum channel 16a with a vacuum source 23.
  • a shut-off device 26 it is also possible to provide only one vacuum channel 16 and shut off the rotor housing 15 when opening against the vacuum channel 16 by means of a shut-off device 26.
  • the obturator 26 is to the comments too FIG. 3 directed.
  • the drive housing 17 is provided with a flushing opening 35, via which the drive housing 17 temporarily, preferably when opening the rotor housing 15, dust-free purging air can be supplied to flush into the drive housing 17 possibly penetrated impurities in the intermediate chamber 18.
  • the flushing port 35 is provided with a filter 30 and communicates with a filter 30 in connection.
  • a flushing line 36 is connected to the flushing opening 35, which in turn is provided with a filter 30 and is closed during the spinning operation by the cover 27 of the rotor housing 15.
  • the purge line 36 is then connected to the ambient air, so that the drive housing 15 dust-free purge air is supplied. Since the flushing takes place only when the rotor housing 15 is open, the flushing opening 35 can be relatively generously dimensioned, as a result of which rapid flushing can be achieved.
  • FIG. 6 A further embodiment of an open-end spinning device 1, in which the penetration of contaminants into the drive housing 17 is avoided, is in FIG. 6 shown. Unlike in the FIGS.
  • the third opening 22 is provided with an air filter 30.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Description

Die vorliegende Erfindung betrifft eine Offenend-Spinnvorrichtung einer Rotorspinnmaschine mit einem Spinnrotor, der eine Rotortasse, in welcher ein Fasermaterial verspinnbar ist, und einen Rotorschaft aufweist, über welchen der Spinnrotor antreibbar und in einer Lagerung vorzugsweise berührungslos gelagert ist. Weiterhin weist die Offenend-Spinnvorrichtung einen Antrieb zum Antreiben des Spinnrotors auf, sowie ein Rotorgehäuse, in welchem die Rotortasse des Spinnrotors angeordnet ist und welches während des Spinnbetriebs über einen Unterdruckkanal der Spinnstelle mit einem Spinnunterdruck beaufschlagt ist.The present invention relates to an open-end spinning device of a rotor spinning machine with a spinning rotor, which has a rotor cup, in which a fiber material is spinnable, and a rotor shaft, via which the spinning rotor is drivable and preferably stored without contact in a storage. Furthermore, the open-end spinning device has a drive for driving the spinning rotor, and a rotor housing, in which the rotor cup of the spinning rotor is arranged and which is acted upon during the spinning operation via a vacuum channel of the spinning station with a spinning vacuum.

Aus der DE 2 246 791 ist eine Spinnmaschine mit derartigen Offenend-Spinnvorrichtungen bekannt. Der Schaft der Spinnrotoren durchdringt dabei jeweils die Rückwand des Rotorgehäuses und ist rückseitig des Rotorgehäuses in einem Lager gehalten. Die Spinnrotoren dieser Spinnmaschine werden mittels eines Zentralantriebs angetrieben, der an einem der beiden stirnseitigen Enden der Spinnmaschine angeordnet ist und die einzelnen Spinnrotoren über einen maschinenlangen Tangentialriemen antreibt. Der Tangentialriemen, die Lager sowie die Schäfte der Spinnrotoren sind in einem in Längsrichtung der Spinnmaschine verlaufenden Kanal untergebracht. Um eine auf die Lager gerichtete Kühlluftströmung zu schaffen, ist zwischen dem Kanal und den Rotorgehäusen ein Luftzuführkanal vorgesehen, über welchen Umgebungsluft in den die Lager beinhaltenden Kanal eingesaugt werden kann.From the DE 2 246 791 is a spinning machine with such open-end spinning devices known. The shaft of the spinning rotors in each case penetrates the rear wall of the rotor housing and is held on the rear side of the rotor housing in a bearing. The spinning rotors of this spinning machine are driven by means of a central drive, which is arranged at one of the two front ends of the spinning machine and drives the individual spinning rotors via a machine-tangential belt. The tangential belt, the bearings and the shafts of the spinning rotors are housed in a running in the longitudinal direction of the spinning machine channel. In order to provide a cooling air flow directed to the bearings, an air supply duct is provided between the duct and the rotor housings, via which ambient air can be sucked into the duct containing the bearing.

Zur Lagerung von Offenend-Spinnrotoren sind neben der Lagerung in einem Keilspalt von Stützscheiben berührungslose Lagerungen wie Magnetlagerungen und Luftlager bekannt geworden. Derartig gelagerte Rotoren werden üblicherweise mit einem elektromotorischen Einzelantrieb angetrieben. Das im Betrieb unter Unterdruck stehende Rotorgehäuse ist mit einem abnehmbaren Deckel verschlossen, um in bestimmten Situationen Zugang zum Rotorgehäuse gewähren zu können. Beispielsweise ist es bei einer Unterbrechung des Spinnprozesses durch Fadenbruch oder einem Reinigerschritt erforderlich, das Rotorgehäuse zu öffnen, um verschiedene Wartungstätigkeiten durchzuführen. Ebenso kommt es vor, dass das Rotorgehäuse auch bei laufendem Betrieb von Bedienpersonal geöffnet wird. Außerdem weist die Offenend-Spinnvorrichtung ein Antriebsgehäuse auf, in welchem sich der Rotorschaft des Spinnrotors erstreckt. Die Lagerung sowie der Antrieb sind in dem von dem Rotorgehäuse weitgehend abgetrennten Antriebsgehäuse angeordnet, um einerseits das Volumen des mit Spinnunterdruck zu beaufschlagenden Rotorgehäuses möglichst klein zu halten und andererseits den Antrieb und die Lagerung des Spinnrotors vor Verunreinigungen durch Staub und Faserflug zu schützen. Aufgrund des mit sehr hohen Drehzahlen umlaufenden Spinnrotors ist dabei jedoch keine vollständige Abdichtung des Rotorgehäuses zu dem Antriebsgehäuse möglich, so dass sich während des Spinnbetriebs auch im Antriebsgehäuse ein Unterdruck aufbaut. Die EP 1 156 142 B1 zeigt beispielsweise eine Offenend-Spinnvorrichtung mit einem derartigen einzeln angetriebenen und magnetisch gelagerten Spinnrotor.For the storage of open-end spinning rotors contactless bearings such as magnetic bearings and air bearings have become known in addition to the storage in a wedge gap of support discs. Such mounted rotors are usually driven by an electric motor single drive. The under pressure in operation rotor housing is with a removable Cover closed to allow access to the rotor housing in certain situations. For example, it is necessary in an interruption of the spinning process by yarn break or a cleaning step to open the rotor housing to perform various maintenance activities. It also happens that the rotor housing is opened even during ongoing operation of operating personnel. In addition, the open-end spinning device has a drive housing in which the rotor shaft of the spinning rotor extends. The storage and the drive are arranged in the drive housing largely separated from the rotor housing, on the one hand to keep the volume of the rotor housing to be acted upon by spinning vacuum as small as possible and on the other hand to protect the drive and storage of the spinning rotor from contamination by dust and fly. Due to the spinning at very high speeds spinning rotor but no complete sealing of the rotor housing to the drive housing is possible, so that builds up a negative pressure in the drive housing during spinning operation. The EP 1 156 142 B1 shows, for example, an open-end spinning device with such a single driven and magnetically mounted spinning rotor.

Wird nun bei derartigen Offenend-Spinnvorrichtungen das unter Unterdruck stehende Rotorgehäuse geöffnet, so findet dort ein Druckausgleich statt, während im angrenzenden Antriebsgehäuse noch immer ein Unterdruck herrscht. Dadurch können beim Öffnen des Rotorgehäuses Verunreinigungen, welche sich im Rotorgehäuse abgelagert haben, in das Antriebsgehäuse eingesaugt werden. Gelangen diese Verunreinigungen nun in den Einzelantrieb des Spinnrotors sowie in die Lagerung, so kann dies bis zu einem Versagen sowohl der Lagerung als auch des Antriebes führen.If the rotor housing under negative pressure is opened in such open-end spinning devices, pressure equalization takes place there, while there is still a negative pressure in the adjacent drive housing. As a result, impurities which have deposited in the rotor housing can be sucked into the drive housing when the rotor housing is opened. If these impurities now enter the individual drive of the spinning rotor and in the storage, this can lead to failure of both the storage and the drive.

Die EP 2 069 562 A1 schlägt daher vor, das Antriebsgehäuse mit einem zusätzlichen Lufteinlass zu versehen und vor dem Öffnen des Rotorgehäuses dem Antriebsgehäuse Druckluft zuzuführen, um dort bereits vor dem Öffnen des Rotorgehäuses einen Druckausgleich durchzuführen. Hierdurch wird das Einsaugen von Verunreinigungen beim Öffnen des Rotorgehäuses vermieden.The EP 2 069 562 A1 proposes, therefore, to provide the drive housing with an additional air inlet and to supply compressed air to the drive housing before opening the rotor housing in order to perform pressure equalization there before opening the rotor housing. This will be the Suction of impurities when opening the rotor housing avoided.

In der DE 10 2012 005 390 A1 wird hingegen vorgeschlagen, das Antriebsgehäuse mit einer mit einem Filter versehenen Öffnung zu versehen, über welche dem Antriebsgehäuse Umgebungsluft zugeführt wird. Aufgrund des Ringspalts zwischen dem Rotorgehäuse und dem Antriebsgehäuse herrscht auch in dem Antriebsgehäuse Unterdruck, so dass ein Luftstrom aus der Umgebung durch das Antriebsgehäuse in das Rotorgehäuse erzeugt wird, der das Ansammeln von Verunreinigungen hinter der Rotortasse verhindert. Um den Filter reinigen zu können, weist das Antriebsgehäuse eine dritte Öffnung auf, über die es bei stehender Spinnvorrichtung mit Druckluft beaufschlagbar ist.In the DE 10 2012 005 390 A1 However, it is proposed to provide the drive housing with a filter provided with an opening through which the drive housing ambient air is supplied. Due to the annular gap between the rotor housing and the drive housing negative pressure prevails in the drive housing, so that an air flow from the environment is generated by the drive housing in the rotor housing, which prevents the accumulation of contaminants behind the rotor cup. In order to clean the filter, the drive housing has a third opening, via which it can be acted upon by the compressed air when the spinning device is stationary.

Aufgabe der vorliegenden Erfindung ist es, eine Offenend-Spinnvorrichtung vorzuschlagen, bei welcher zumindest beim Öffnen des Rotorgehäuses das Einsaugen von Verunreinigungen in das Antriebsgehäuse vermieden wird und welche mit verschiedenen Lagerungsarten einsetzbar ist.The object of the present invention is to propose an open-end spinning device in which, at least when the rotor housing is opened, the suction of contaminants into the drive housing is avoided and which can be used with different types of bearings.

Die Aufgabe wird gelöst mit den Merkmalen der unabhängigen Ansprüche.The object is solved with the features of the independent claims.

Eine Offenend-Spinnvorrichtung einer Rotorspinnmaschine weist einen Spinnrotor mit einer Rotortasse, in welcher ein Fasermaterial verspinnbar ist, und mit einem Rotorschaft, über welchen der Spinnrotor antreibbar ist und in einer Lagerung vorzugsweise berührungslos gelagert ist, auf. Weiterhin weist die Offenend-Spinnvorrichtung einen Einzelantrieb, zum Antreiben des Spinnrotors, ein Rotorgehäuse, in welchem die Rotortasse des Spinnrotors angeordnet ist und welches während des Spinnbetriebs über einen Unterdruckkanal der Spinnstelle mit einem Spinnunterdruck beaufschlagt ist, sowie ein Antriebsgehäuse, in welchem sich der Rotorschaft des Spinnrotors erstreckt und in welchem der Antrieb und die Lagerung des Spinnrotors angeordnet sind, auf. Es ist vorgesehen, dass das Rotorgehäuse und das Antriebsgehäuse in einer axialen Richtung des Rotorschafts beabstandet zueinander in der Offenend-Spinnvorrichtung angeordnet sind.An open-end spinning device of a rotor spinning machine has a spinning rotor with a rotor cup, in which a fiber material is spinnable, and with a rotor shaft, via which the spinning rotor is drivable and is preferably mounted without contact in a bearing on. Furthermore, the open-end spinning device has a single drive, for driving the spinning rotor, a rotor housing, in which the rotor cup of the spinning rotor is arranged and which is acted upon during the spinning operation via a vacuum channel of the spinning station with a spinning vacuum, and a drive housing, in which the rotor shaft of the spinning rotor extends and in which the drive and the storage of the spinning rotor are arranged on. It is envisaged that the rotor housing and the drive housing spaced apart in an axial direction of the rotor shaft in the open-end spinning device.

Unter dem Rotorgehäuse und dem Antriebsgehäuse wird im Rahmen der vorliegenden Erfindung lediglich das den Rotor bzw. den Einzelantrieb unmittelbar umgebende Gehäuse verstanden. Dieses ist jeweils durch eine vordere und eine hintere Begrenzungswand sowie entweder eine umlaufende Seitenwand (beispielsweise im Falle eines zylindrischen Gehäuses) oder mehrere einzelne Seitenwände gebildet. Die vordere Begrenzungswand ist dabei jeweils der Abzugsseite der Spinnvorrichtung zugewandt und wird im Falle des Rotorgehäuses durch einen abnehmbaren Deckel gebildet, an welchem in der Regel auch die Abzugsdüse der Spinnvorrichtung angeordnet ist. Die rückwärtige Begrenzungswand ist hingegen jeweils der Antriebsseite der Spinnvorrichtung zugewandt. So können beispielsweise das Rotorgehäuse und/oder das Antriebsgehäuse auch durch einen Abstandshalter miteinander verbunden sein, welcher für die beabstandete Anordnung das Rotorgehäuses und des Antriebsgehäuses zueinander sorgt. Ein derartiger Abstandshalter kann dabei auch einteilig an das das Rotorgehäuse und/oder das Antriebsgehäuse angeformt sein.Under the rotor housing and the drive housing is understood in the context of the present invention, only the housing directly surrounding the rotor or the individual drive. This is each formed by a front and a rear boundary wall and either a circumferential side wall (for example, in the case of a cylindrical housing) or a plurality of individual side walls. The front boundary wall is in each case facing the withdrawal side of the spinning device and, in the case of the rotor housing, is formed by a removable cover, on which, as a rule, the draw-off nozzle of the spinning device is arranged. The rear boundary wall, however, in each case faces the drive side of the spinning device. Thus, for example, the rotor housing and / or the drive housing may also be connected to one another by a spacer, which ensures the spaced arrangement of the rotor housing and the drive housing to each other. Such a spacer can also be integrally formed on the rotor housing and / or the drive housing.

Bei einem Verfahren zum Betreiben einer Offenend-Spinnvorrichtung einer Rotorspinnmaschine, bei welchem die Offenend-Spinnvorrichtung einen mittels eines Einzelantriebs, angetriebenen und in einer Lagerung vorzugsweise berührungslos gelagerten Spinnrotor mit einer Rotortasse und mit einem Rotorschaft aufweist, und bei welchem die Rotortasse des Spinnrotors in einem Rotorgehäuse angeordnet ist, wird das Rotorgehäuse während des Spinnbetriebs mit Spinnunterdruck beaufschlagt. Der Rotorschaft des Spinnrotors erstreckt sich dabei in einem Antriebsgehäuse, in welchem weiterhin auch der Einzelantrieb und die Lagerung des Spinnrotors angeordnet sind. Bei dem Verfahren wird ein Luftstrom vom Rotorgehäuse in das Antriebsgehäuse dadurch vermieden, dass das Rotorgehäuse und das Antriebsgehäuse in einer axialen Richtung des Rotorschafts beabstandet zueinander in der Offenend-Spinnvorrichtung angeordnet sind.In a method for operating an open-end spinning device of a rotor spinning machine, in which the open-end spinning device by means of a single drive, driven and preferably mounted in a bearing contactlessly mounted spinning rotor with a rotor cup and with a rotor shaft, and in which the rotor cup of the spinning rotor in a Rotor housing is arranged, the rotor housing is subjected during the spinning operation with spinning vacuum. The rotor shaft of the spinning rotor extends in a drive housing, in which also the individual drive and the bearing of the spinning rotor are arranged. In the method, an air flow from the rotor housing is avoided in the drive housing, characterized in that the rotor housing and the drive housing in a Axial direction of the rotor shaft spaced from each other in the open-end spinning device are arranged.

Aufgrund der beabstandeten Anordnung des Rotorgehäuses und des Antriebsgehäuses zueinander herrscht in dem an das Rotorgehäuse und an das Antriebsgehäuse angrenzenden Bereich, der nicht nach außen zur Umgebung hin abgedichtet ist, sowohl während des Spinnbetriebs als auch beim Öffnen des Rotorgehäuses Umgebungsluftdruck. Es kann sich somit während des Spinnbetriebs kein Unterdruck in dem Antriebsgehäuse aufbauen. Es kann daher auch beim Öffnen des Rotorgehäuses und dem dabei im Rotorgehäuse stattfindenden Druckausgleich nicht mehr zu einem Einsaugen von Schmutzpartikeln in das Antriebsgehäuse kommen.Due to the spaced arrangement of the rotor housing and the drive housing to each other prevails in the adjacent to the rotor housing and the drive housing area which is not sealed to the outside, both during spinning operation and when opening the rotor housing ambient air pressure. It can thus build up during the spinning operation no negative pressure in the drive housing. It can therefore no longer come to the suction of dirt particles in the drive housing when opening the rotor housing and taking place in the rotor housing pressure compensation.

Dabei ist zwischen dem Rotorgehäuse und dem Antriebsgehäuse eine Zwischenkammer angeordnet, wobei die Zwischenkammer eine erste Verbindungsöffnung zu dem Rotorgehäuse und eine zweite Verbindungsöffnung zu dem Antriebsgehäuse aufweist. Weiterhin weist die Zwischenkammer eine dritte Öffnung auf, über welche die Zwischenkammer entweder mit einer Unterdruckquelle oder aber mit Umgebungsluftdruck zumindest bei einer Unterbrechung des Spinnbetriebs in Verbindung steht.In this case, an intermediate chamber is arranged between the rotor housing and the drive housing, wherein the intermediate chamber has a first connection opening to the rotor housing and a second connection opening to the drive housing. Furthermore, the intermediate chamber has a third opening, via which the intermediate chamber communicates either with a negative pressure source or with ambient air pressure at least when the spinning operation is interrupted.

Bei dem Verfahren zum Betreiben der Offenend-Spinnvorrichtung ist zwischen dem Rotorgehäuse und dem Antriebsgehäuse eine Zwischenkammer angeordnet, die über eine erste Verbindungsöffnung mit dem Rotorgehäuse und über eine zweite Verbindungsöffnung mit dem Antriebsgehäuse in Verbindung steht. Der Schaft des Spinnrotors erstreckt sich dabei von dem Rotorgehäuse bis in das Antriebsgehäuse. Bei dem Verfahren ist vorgesehen, dass die Zwischenkammer zumindest bei einer Unterbrechung des Spinnbetriebs derart mit Unterdruck oder mit Umgebungsluftdruckbeaufschlagt wird, dass beim Öffnen des Rotorgehäuses ein Luftstrom in das Antriebsgehäuse zumindest vermieden wird. Vorzugsweise wird bei dem Verfahren ein Luftstrom aus dem Antriebsgehäuse in die Zwischenkammer erzeugt.In the method for operating the open-end spinning device, an intermediate chamber is arranged between the rotor housing and the drive housing, which communicates with the rotor housing via a first connection opening and with the drive housing via a second connection opening. The shaft of the spinning rotor extends from the rotor housing into the drive housing. In the method, it is provided that the intermediate chamber is subjected to negative pressure or ambient air pressure, at least when the spinning operation is interrupted, such that an air flow into the drive housing is at least avoided when the rotor housing is opened. Preferably, in the method, an air flow from the drive housing is generated in the intermediate chamber.

Die Zwischenkammer wird somit zumindest zeitgleich mit dem Beginn des Öffnens des Rotorgehäuses, bevorzugt jedoch bereits kurz zuvor entweder mit Unterdruck oder mit Umgebungsluftdruck beaufschlagt. Die Zwischenkammer bleibt dabei zumindest so lange beaufschlagt, solange die Unterbrechung des Spinnprozesses andauert bzw. so lange das Rotorgehäuse geöffnet ist. Es ist jedoch auch möglich, die Zwischenkammer ständig, also auch während des Spinnbetriebs, zu beaufschlagen. Es ist somit durch die zwischen dem Rotorgehäuse und dem Antriebsgehäuse angeordnete Zwischenkammer möglich, durch das gezielte Beaufschlagen der Zwischenkammer einen Luftstrom und das damit verbundene Einsaugen von verschmutzter Luft in das Antriebsgehäuse zu verhindern oder zumindest weitgehend zu vermeiden. Insbesondere durch das Beaufschlagen der Zwischenkammer mit Unterdruck kann dabei auch ein gezielter Luftstrom durch die Zwischenkammer erzeugt werden, der nicht nur beim Öffnen des Rotorgehäuses einem Einsaugen von Schmutzpartikeln in das Antriebsgehäuse entgegen wirkt, sondern Ablagerungen auch während des Betriebs vermeiden kann.The intermediate chamber is thus at least at the same time with the beginning of the opening of the rotor housing, but preferably already applied shortly before either with negative pressure or ambient air pressure. The intermediate chamber remains at least as long as the interruption of the spinning process continues or as long as the rotor housing is open. However, it is also possible to continuously pressurize the intermediate chamber, that is also during the spinning operation. It is thus possible by the arranged between the rotor housing and the drive housing intermediate chamber to prevent or at least largely avoided by the targeted pressurization of the intermediate chamber, an air flow and the associated suction of polluted air in the drive housing. In particular, by applying the intermediate chamber with negative pressure can also be a targeted air flow generated by the intermediate chamber, which counteracts not only when opening the rotor housing a suction of dirt particles in the drive housing, but can also avoid deposits during operation.

Die Zwischenkammer kann dabei sowohl als separates Gehäuse ausgeführt sein oder durch einen Fortsatz des Rotorgehäuses oder des Antriebsgehäuses oder auch beider Gehäuse ausgebildet sein. Beispielsweise können die Seitenwand bzw. die Seitenwände des Rotorgehäuses bis über seine hintere Begrenzungswand hinaus verlängert sein und hierdurch die Zwischenkammer ausbilden. Die derart gebildete Zwischenkammer ist mittels einer Dichtung gegen das angrenzende Antriebsgehäuse abgedichtet. Ebenso könnten in analoger Weise auch die Seitenwand bzw. die Seitenwände des Antriebsgehäuses bis über dessen vordere Begrenzungswand hinaus verlängert sein.The intermediate chamber can be designed both as a separate housing or be formed by an extension of the rotor housing or the drive housing or both housing. For example, the side wall or the side walls of the rotor housing may be extended beyond its rear boundary wall and thereby form the intermediate chamber. The thus formed intermediate chamber is sealed by means of a seal against the adjacent drive housing. Likewise, in an analogous manner, the side wall or the side walls of the drive housing could be extended to beyond the front boundary wall also.

Die erste und/oder die zweite Verbindungsöffnung sind dabei vorzugsweise um den Rotorschaft angeordnet. Insbesondere sind die erste und/oder die zweite Verbindungsöffnung als Ringspalt um den Rotorschaft ausgebildet, da eine vollständige Abdichtung der Gehäuse zueinander meist nicht möglich ist. Es ist jedoch auch möglich, die Verbindungsöffnungen, insbesondere die erste Verbindungsöffnung zum Rotorgehäuse, in den Bereich eines Bundes der Rotortasse zu legen. Insbesondere die erste Verbindungsöffnung kann somit auch als Ringspalt um den Rotortellerbund ausgebildet sein. Es kann somit einerseits eine gewisse Abdichtung der Gehäuse bzw. der Zwischenkammer zueinander erreicht werden, die insbesondere die Aufrechterhaltung des Spinnunterdrucks in dem Rotorgehäuse ermöglicht, und dennoch durch die Ringspalte hindurch eine gezielte Luftströmung ausgebildet werden, die Verschmutzungen abführt. Ist die erste Verbindungsöffnung im Bereich des Bundes der Rotortasse vorgesehen, so können zumindest bei einer mit Unterdruck beaufschlagten Zwischenkammer in vorteilhafter Weise bei der Demontage des Rotortellers eventuelle Verschmutzungen aus der Kupplungsstelle zwischen Rotorschaft und Rotorteller abgesaugt werden.The first and / or the second connection opening are preferably arranged around the rotor shaft. In particular, the first and / or the second connection opening are formed as an annular gap around the rotor shaft, since a complete seal of the housing to each other is usually not possible. However, it is also possible to place the connection openings, in particular the first connection opening to the rotor housing, in the region of a collar of the rotor cup. In particular, the first connection opening can thus also be designed as an annular gap around the rotor cup assembly. Thus, on the one hand, a certain sealing of the housing or the intermediate chamber relative to each other can be achieved, which in particular makes it possible to maintain the spinning negative pressure in the rotor housing, and nevertheless a targeted air flow is formed through the annular gaps, which dissipates soiling. If the first connection opening is provided in the region of the collar of the rotor cup, then, at least in the case of an intermediate chamber subjected to negative pressure, any possible contamination from the coupling point between rotor shaft and rotor cup can be sucked off during the disassembly of the rotor cup.

Vorteilhaft ist es weiterhin, wenn die Lagerung ein auf das der Rotortasse abgewandte Ende des Spinnrotors wirkendes Axiallager beinhaltet. Dieses übernimmt die axiale Lagerung des Spinnrotors, so dass die radiale Lagerung des Spinnrotors von dieser unabhängig ausgebildet werden kann. Die Ausführung und Regelung des Radiallagers ist hierdurch im Vergleich zu einer Ausführung, bei welcher kein separates Axiallager vorgesehen ist, vereinfacht und die Lagerung ist weniger anfällig.It is furthermore advantageous if the bearing includes an axial bearing acting on the end of the spinning rotor facing away from the rotor cup. This takes over the axial bearing of the spinning rotor, so that the radial bearing of the spinning rotor can be formed independently of this. The design and control of the radial bearing is thereby compared to a design in which no separate thrust bearing is provided, simplified and the storage is less prone.

Besonders vorteilhaft ist es, wenn das Axiallager als Axialluftlager ausgebildet ist oder zumindest ein Axialluftlager beinhaltet, da hierdurch die Ausbildung eines Luftstromes aus dem Antriebsgehäuse in die Zwischenkammer unterstützt werden kann. Die Erfindung ist jedoch ebenfalls in einer Offenend-Spinnvorrichtung einsetzbar, bei welcher auch das Axiallager des Spinnrotors als Magnetlager oder auch in anderer Weise ausgeführt ist.It is particularly advantageous if the axial bearing is designed as an axial air bearing or at least includes an axial air bearing, as this can support the formation of an air flow from the drive housing into the intermediate chamber. However, the invention can also be used in an open-end spinning device, in which the axial bearing of the spinning rotor is designed as a magnetic bearing or in other ways.

Weiterhin ist es vorteilhaft, wenn die Lagerung eine Magnetlagerung, insbesondere ein Radialmagnetlager, beinhaltet. Insbesondere bei einem einzeln angetriebenen Spinnrotor ist die Ausführung der Radiallagerung des Spinnrotors als Magnetlagerung vorteilhaft. Da derartige Magnetlager besonders anfällig gegen Verschmutzungen sind, kommen die Vorteile der Ausbildung einer gezielten Luftströmung mithilfe einer Zwischenkammer zwischen dem Rotorgehäuse und dem Antriebsgehäuse dort besonders zum Tragen.Furthermore, it is advantageous if the bearing includes a magnetic bearing, in particular a radial magnetic bearing. Especially with a single driven spinning rotor, the execution of the radial bearing of the spinning rotor is advantageous as a magnetic bearing. Since such magnetic bearings are particularly susceptible to contamination, the benefits of the formation of a targeted air flow using an intermediate chamber between the rotor housing and the drive housing there are particularly significant.

Nach einer vorteilhaften ersten Ausführungsform der Erfindung wird die Zwischenkammer zumindest beim Öffnen des Rotorgehäuses, vorzugsweise jedoch bereits vor dem Öffnen des Rotorgehäuses mit Unterdruck beaufschlagt. Die Zwischenkammer weist hierzu neben den beiden als Ringspalt ausgebildeten Verbindungsöffnungen eine dritte Öffnung auf, welche mit einer Unterdruckquelle in Verbindung steht. Wird nun das Rotorgehäuse geöffnet, wodurch im Rotorgehäuse ein Druckausgleich mit der Umgebung stattfindet, so wird aufgrund des in der Zwischenkammer sowie im Bereich des Ringspalts zwischen der Zwischenkammer und dem Antriebsgehäuse herrschenden Unterdrucks das Einsaugen von Verschmutzungen in das Antriebsgehäuse vermieden. Besonders vorteilhaft bei dieser Ausführung ist es, dass auch im Bereich der Verbindungsöffnung von der Zwischenkammer zu dem Rotorgehäuse Unterdruck anliegt, so dass etwaige Ablagerungen aus dem Bereich hinter der Rotortasse abgesaugt und unmittelbar abgeführt werden können. Ist zumindest das Axiallager des Spinnrotors, gegebenenfalls aber auch die Radiallagerung, dabei als Luftlager ausgeführt, so kann der Luftstrom durch die Zwischenkammer dadurch weiterhin unterstützt werden.According to an advantageous first embodiment of the invention, the intermediate chamber is at least when opening the rotor housing, but preferably already applied before opening the rotor housing with negative pressure. For this purpose, the intermediate chamber has, in addition to the two connecting openings designed as an annular gap, a third opening which is in communication with a vacuum source. Now, if the rotor housing is opened, whereby a pressure equalization with the environment takes place in the rotor housing, the suction of dirt into the drive housing is avoided due to the prevailing in the intermediate chamber and in the region of the annular gap between the intermediate chamber and the drive housing negative pressure. It is particularly advantageous in this embodiment that negative pressure is applied even in the area of the connection opening from the intermediate chamber to the rotor housing, so that any deposits can be sucked out of the area behind the rotor cup and removed directly. If at least the axial bearing of the spinning rotor, but possibly also the radial bearing, designed as an air bearing, so the air flow through the intermediate chamber can continue to be supported.

Besonders vorteilhaft ist es dabei, wenn die Zwischenkammer ständig, also auch während des Spinnbetriebs, mit Unterdruck beaufschlagt wird, da hierdurch bereits während der Spinnbetriebes die Ablagerung und das Wandern von Verunreinigungen vermieden werden können.It is particularly advantageous if the intermediate chamber is constantly subjected to negative pressure, that is to say also during the spinning operation, since the deposition and migration of contaminants can already be avoided during the spinning operation.

In besonders vorteilhafter Ausführung wird die Zwischenkammer ebenso wie das Rotorgehäuse mit Spinnunterdruck beaufschlagt. Die Zwischenkammer steht hierzu über die dritte Öffnung direkt mit dem Unterdruckkanal der Offenend-Spinnvorrichtung für den Spinnunterdruck in Verbindung. Es sind somit bis auf das Vorsehen der Zwischenkammer keine weiteren konstruktiven Vorkehrungen zu treffen, so dass die Offenend-Spinnvorrichtung auch kostengünstig ausgeführt werden kann. Die Zwischenkammer kann dabei mit dem Unterdruckkanal in Verbindung stehen, der auch das Rotorgehäuse mit der Unterdruckquelle bzw. einer maschinenlangen Unterdruckleitung verbindet, oder über einen eigenen Unterdruckkanal zur Unterdruckquelle bzw. zu der maschinenlangen Unterdruckleitung verfügen. Vorteilhaft bei dieser Ausführung ist auch, dass zumindest beim Öffnen des Rotorgehäuses ein Luftstrom aus der Zwischenkammer in den Unterdruckkanal erzeugt wird, welcher dafür sorgt, dass nicht nur das Einsaugen von Luft in das Antriebsgehäuse vermieden wird, sondern sogar aktiv Luft aus dem Antriebsgehäuse abgeführt wird.In a particularly advantageous embodiment, the intermediate chamber as well as the rotor housing is subjected to spinning negative pressure. The intermediate chamber stands on the third opening directly to the vacuum channel of the open-end spinning device for the spinning vacuum in combination. Thus, apart from the provision of the intermediate chamber, no further constructional precautions are to be taken, so that the open-end spinning device can also be designed inexpensively. The intermediate chamber can be in communication with the vacuum channel, which also connects the rotor housing with the vacuum source or a machine-long vacuum line, or have its own vacuum channel to the vacuum source or to the machine-long vacuum line. An advantage of this design is that at least when opening the rotor housing, an air flow from the intermediate chamber is generated in the vacuum channel, which ensures that not only the suction of air is avoided in the drive housing, but even active air is removed from the drive housing ,

Es ist jedoch nach einer Abwandlung dieser Ausführungsform nicht erforderlich, die Zwischenkammer ständig mit Unterdruck zu beaufschlagen. Vielmehr ist es ausreichend, dies erst kurz vor oder auch erst beim Öffnen des Rotorgehäuses vorzunehmen. Die dritte Öffnung der Zwischenkammer kann in diesem Fall mit einem steuerbaren Absperrorgan versehen sein, das vorzugsweise durch das Öffnen und Schließen des Rotorgehäuses betätigbar ist. So kann beispielsweise das Öffnen des Rotorgehäuses oder eines mit dem Rotorgehäuse verbundenen Schwenkgehäuses durch einen Sensor registriert werden, welcher wiederum das Schalten des Absperrorgans auslöst. Eine rein mechanische Kopplung des Absperrorgans mit dem Rotorgehäuse ist natürlich ebenfalls möglich.However, it is not necessary according to a modification of this embodiment, to constantly pressurize the intermediate chamber with negative pressure. Rather, it is sufficient to make this shortly before or even when opening the rotor housing. The third opening of the intermediate chamber may be provided in this case with a controllable shut-off device, which is preferably actuated by the opening and closing of the rotor housing. Thus, for example, the opening of the rotor housing or a pivot housing connected to the rotor housing can be registered by a sensor, which in turn triggers the switching of the obturator. A purely mechanical coupling of the obturator with the rotor housing is of course also possible.

Nach einer anderen Ausführung ist hingegen die dritte Öffnung nicht mit einer Unterdruckquelle verbunden, sondern steht lediglich mit der Umgebungsluft in Verbindung. Die Zwischenkammer ist dabei über die dritte Öffnung ständig mit Umgebungsluftdruck beaufschlagt bzw. steht mit Umgebungsdruck in Verbindung. In diesem Fall wird aufgrund des Umgebungsluftdrucks in der Zwischenkammer das Entstehen eines Unterdrucks im Antriebsgehäuse während des Spinnbetriebs vermieden. Es wird daher auch bei einem Öffnen des Rotorgehäuses keine Luft in das Antriebsgehäuse eingesogen. Auch diese Ausführung der Erfindung ist sowohl mit einer Magnetlagerung als auch mit einem Luftlager oder mit einer kombinierten Lagerung einsetzbar. Dabei ist es auch möglich, über die dritte Öffnung der Zwischenkammer dosiert nur eine geringe Luftmenge zuzuführen, die gerade noch ausreichend ist, um das Einsaugen von Staub aus dem Rotorgehäuse indie Zwischenkammer bzw. in das Antriebsgehäuse zu verhindern. Weiterhin kann hierdurch auch dem Rotorgehäuse eine sehr geringe Luftmenge zugeführt werden, die Ablagerungen im Rotorgehäuse hinter dem Rotorteller von vorneherein verhindert. Es können somit auch beim Öffnen des Rotorgehäuses und dem dadurch dort stattfindenden Druckanstieg keine Verunreinigungen mehr in das Antriebsgehäuse gelangen. Die Menge der zugeführten Luft kann dabei über die Größe der dritten Öffnung gesteuert werden. Es stellt sich in diesem Fall in der Zwischenkammer und aufgrund der Verbindungsöffnung zu dem Antriebsgehäuse auch in dem Antriebsgehäuse ein Druck ein, der zwar höher liegt als der Spinnunterdruck im Rotorgehäuse, jedoch aufgrund der nur geringen zugeführten Luftmenge noch immer unterhalb des Umgebungsluftdruckes.According to another embodiment, however, the third opening is not connected to a vacuum source, but communicates only with the ambient air. The intermediate chamber is constantly acted upon by the third opening with ambient air pressure or is in communication with ambient pressure. In this case, due to the ambient air pressure avoided in the intermediate chamber, the emergence of a negative pressure in the drive housing during the spinning operation. Therefore, no air is sucked into the drive housing even when the rotor housing is opened. This embodiment of the invention can be used both with a magnetic bearing and with an air bearing or with a combined storage. It is also possible to metered via the third opening of the intermediate chamber supply only a small amount of air, which is barely sufficient to prevent the suction of dust from the rotor housing in the intermediate chamber or in the drive housing. Furthermore, this can also be supplied to the rotor housing a very small amount of air, which prevents deposits in the rotor housing behind the rotor cup from the outset. It can thus no longer get into the drive housing when opening the rotor housing and thereby taking place there pressure increase. The amount of air supplied can be controlled by the size of the third opening. It turns in this case in the intermediate chamber and due to the connection opening to the drive housing in the drive housing, a pressure that is higher than the spinning vacuum in the rotor housing, but still due to the low amount of air supplied below the ambient air pressure.

Vorteilhaft ist es weiterhin, wenn die Umgebungsluft vor ihrem Zuführen in die Zwischenkammer gefiltert wird. Bei einer Offenend-Spinnvorrichtung ist hierzu die dritte Öffnung vorzugsweise mit einem Luftfilter versehen. Durch das Filtern der der Zwischenkammer zugeführten Luft kann somit das Eindringen von Schmutz aus der Umgebung in das Rotorgehäuse vermieden werden.It is also advantageous if the ambient air is filtered before it is fed into the intermediate chamber. In an open-end spinning device for this purpose, the third opening is preferably provided with an air filter. By filtering the air supplied to the intermediate chamber, the ingress of dirt from the environment into the rotor housing can thus be avoided.

Weist die Lagerung des Spinnrotors ein Luftlager auf, so ist es zur Durchführung des Verfahrens vorteilhaft, wenn der Luftdurchsatz durch das Luftlager derart gesteuert wird, dass in dem Antriebsgehäuse stets ein größerer Druck herrscht als in der Zwischenkammer. Es kann hierdurch sowohl bei einer mit Unterdruck als auch bei einer mit Umgebungsluftdruck beaufschlagten Zwischenkammer nicht nur das Einsaugen von Luft und Schmutz in das Antriebsgehäuse beim Öffnen des Rotorgehäuses vermieden werden, sondern es wird zugleich während des Spinnbetriebs das Eindringen von Verschmutzungen in das Antriebsgehäuse vermieden. Derartige Verschmutzungen können nämlich auch im normalen Spinnbetrieb ohne dass aktive Einsaugen von verschmutzter Luft aufgrund der nicht vollständigen Abdichtung im Bereich der Ringspalte entstehen.If the bearing of the spinning rotor has an air bearing, it is advantageous for carrying out the method if the air flow through the air bearing is controlled in such a way that there is always a greater pressure in the drive housing than in the intermediate chamber. It can thereby both at one with Negative pressure as well as at an acted upon by ambient air pressure intermediate chamber not only the suction of air and dirt in the drive housing when opening the rotor housing can be avoided, but it is also avoided during the spinning operation, the ingress of dirt into the drive housing. Namely, such contamination can also occur during normal spinning operation without active suction of polluted air due to the imperfect seal in the region of the annular gaps.

Weitere Vorteile der Erfindung werden anhand der nachfolgend dargestellten Ausführungsbeispiele beschrieben. Es zeigen:

Figur 1
eine Offenend-Spinnvorrichtung einer Rotorspinnmaschine in einer Seitenansicht in einer schematischen Übersichtsdarstellung,
Figur 2
eine erste Ausführung einer Offenend-Spinnvorrichtung mit einer an eine Unterdruckquelle angeschlossenen Zwischenkammer,
Figur 3
eine Abwandlung der in Figur 2 dargestellten OffenendSpinnvorrichtung mit einer unterdruckbeaufschlagten Zwischenkammer,
Figur 4
eine weitere Abwandlung der in Figur 2 dargestellten OffenendSpinnvorrichtung mit einer unterdruckbeaufschlagten Zwischenkammer,
Figur 5
eine weitere Ausführung einer Offenend-Spinnvorrichtung mit einer unterdruckbeaufschlagten Zwischenkammer und einem lediglich ein Axialmagnetlager beinhaltenden Axiallager, sowie
Figur 6
eine Offenend-Spinnvorrichtung mit einer mit Umgebungsluft beaufschlagten Zwischenkammer.
Further advantages of the invention will be described with reference to the embodiments illustrated below. Show it:
FIG. 1
an open-end spinning device of a rotor spinning machine in a side view in a schematic overview representation,
FIG. 2
A first embodiment of an open-end spinning device with an intermediate chamber connected to a vacuum source,
FIG. 3
a modification of the in FIG. 2 illustrated open-end spinning device with a vacuum-loaded intermediate chamber,
FIG. 4
another variation of in FIG. 2 illustrated open-end spinning device with a vacuum-loaded intermediate chamber,
FIG. 5
a further embodiment of an open-end spinning device with a vacuum-loaded intermediate chamber and a thrust bearing containing only a Axialmagnetlager, and
FIG. 6
an open-end spinning device with an ambient chamber acted upon by ambient air.

Figur 1 zeigt eine schematische Darstellung einer Offenend-Spinnvorrichtung 1 einer Rotorspinnmaschine 2 in einer schematischen Seitenansicht. Die Rotorspinnmaschine 2 beinhaltet in üblicher Weise eine Speisevorrichtung 8, welche der Offenend-Spinnvorrichtung 1 ein Fasermaterial 6 über eine Auflösevorrichtung 9, welche das Fasermaterial in Einzelfasern auflöst, zuführt. In der Offenend-Spinnvorrichtung 1 wird das Fasermaterial 6 in einer Rotortasse 4 (s. Fig. 2 - 6) eines Spinnrotors 3 zu einem Garn 7 versponnen, über eine Abzugsvorrichtung 10 abgezogen und mit einer Spulvorrichtung 11 auf eine Spule 12 aufgewickelt. FIG. 1 shows a schematic representation of an open-end spinning device 1 of a rotor spinning machine 2 in a schematic side view. The rotor spinning machine 2 includes in a conventional manner a feed device 8, which the open-end spinning device 1, a fiber material 6 via a dissolving device 9, which dissolves the fiber material into individual fibers, supplies. In the open-end spinning device 1, the fiber material 6 in a rotor cup 4 (s. Fig. 2-6 ) spun a spinning rotor 3 to a yarn 7, withdrawn via a take-off device 10 and wound with a winding device 11 on a spool 12.

Die Offenend-Spinnvorrichtung 1 umfasst neben dem Spinnrotor 3 mit der Rotortasse 4 und dem Rotorschaft 5 (siehe Figuren 2 - 6) ein Rotorgehäuse 15, in welchem die Rotortasse 4 angeordnet ist, sowie ein Antriebsgehäuse 17, in welchem sich der Schaft 5 des Spinnrotors 3 erstreckt. Der Spinnrotor 3 ist nach der vorliegenden Darstellung mittels eines Einzelantriebs 14 angetrieben und in einer Lagerung 13 gelagert. Als Lagerung 13 des Spinnrotors kommen dabei Stützscheibenlagerungen, Magnetlager sowie Luftlager infrage. Die Lagerung 13 beinhaltet dabei Radiallager 25 und kann darüber hinaus noch ein separat von den Radiallagern 25 ausgebildetes Axiallager 24 beinhalten. Das Axiallager 24 kann als Axialluftlager 24a oder als Axialmagnetlager ausgebildet sein oder auch durch eine Kombination aus diesen beiden Lagerungsarten gebildet sein. Auch in den Offenend-Spinnvorrichtungen 1 der folgenden Figuren 2 - 6 kann abweichend von den jeweils gezeigten Lagerungsarten auch eine andere Lagerungsart alternativ oder zusätzlich eingesetzt werden. Aus Gründen der Übersichtlichkeit ist vorliegend lediglich die Lagerung 13 ohne ihre einzelnen Komponenten beschriftet.The open-end spinning device 1 comprises in addition to the spinning rotor 3 with the rotor cup 4 and the rotor shaft 5 (see Figures 2 - 6 ), a rotor housing 15, in which the rotor cup 4 is arranged, and a drive housing 17, in which the shaft 5 of the spinning rotor 3 extends. The spinning rotor 3 is driven by the present illustration by means of a single drive 14 and stored in a bearing 13. As bearing 13 of the spinning rotor while support disk bearings, magnetic bearings and air bearings come into question. The bearing 13 includes radial bearings 25 and may also include a separately formed from the radial bearings 25 thrust bearing 24. The thrust bearing 24 may be formed as Axialluftlager 24a or as Axialmagnetlager or be formed by a combination of these two types of storage. Also in the open-end spinning devices 1 of the following Figures 2 - 6 Deviating from the types of storage shown in each case, another type of storage can alternatively or additionally be used. For reasons of clarity, in the present case only the bearing 13 is labeled without its individual components.

Das Rotorgehäuse 15 ist mittels eines abnehmbaren, insbesondere abschwenkbaren, Deckels 27 (siehe Pfeil) verschlossen. Zum Durchführen von Wartungstätigkeiten an der Offenend-Spinnvorrichtung kann der Deckel 27 des Rotorgehäuses 15 sowohl durch eine automatische Wartungsvorrichtung als auch durch einen Bediener abgenommen werden, wie vorliegend durch den Pfeil symbolisiert. Nach vorliegender Darstellung ist der Deckel 27 des Rotorgehäuses 15 dabei mit einem abschwenkbaren Schwenkgehäuse 29 verbunden, und kann gemeinsam mit diesem geöffnet werden. Ebenso ist es jedoch auch möglich, das Rotorgehäuse 15 mit einem separaten Deckel 27 zu versehen.The rotor housing 15 is closed by means of a removable, in particular pivotable, cover 27 (see arrow). To perform Maintenance operations on the open-end spinning device, the lid 27 of the rotor housing 15 can be removed both by an automatic maintenance device as well as by an operator, as symbolized by the arrow. As shown, the cover 27 of the rotor housing 15 is connected to a swing-pivot housing 29, and can be opened together with this. However, it is also possible to provide the rotor housing 15 with a separate cover 27.

Im Spinnbetrieb ist das Rotorgehäuse 15 über einen Unterdruckkanal 16 der Offenend-Spinnvorrichtung 1 mit einem für den Spinnprozess erforderlichen Spinnunterdruck pSUbeaufschlagt. Hierzu ist vorliegend der Unterdruckkanal 16 der Offenend-Spinnvorrichtung 1 mit einer maschinenlangen Unterdruckleitung 33 verbunden, welche wiederum mit einer zentralen Unterdruckquelle 23 in Verbindung steht. Um den Spinnunterdruck pSUin dem Rotorgehäuse 15 aufrechtzuerhalten, ist zwischen dem Deckel 27 des Rotorgehäuses 15 und dem Rotorgehäuse 15 eine Dichtung 28 angeordnet.In spinning operation, the rotor housing 15 is acted upon via a vacuum channel 16 of the open-end spinning device 1 with a spinning negative pressure p SU required for the spinning process. For this purpose, in the present case the vacuum channel 16 of the open-end spinning device 1 is connected to a machine-length vacuum line 33, which in turn communicates with a central negative pressure source 23. In order to maintain the spinning vacuum p SU in the rotor housing 15, a seal 28 is arranged between the cover 27 of the rotor housing 15 and the rotor housing 15.

Der Antrieb 14 sowie die Lagerung 13, welche mit dem Rotorschaft 5 des Spinnrotors 3 zusammenwirken, sind hingegen in einem von dem Rotorgehäuse 15 abgetrennten Antriebsgehäuse 17 angeordnet, um diese einerseits vor Verschmutzungen sowohl aus der Umgebung als auch vor Verschmutzungen und Faserflug aus den Bereich des Spinnrotors 3 zu schützen. Der Rotorschaft 5 des Spinnrotors 3 erstreckt sich somit von dem Rotorgehäuse 15 bis in das Antriebsgehäuse 17.The drive 14 and the bearing 13, which cooperate with the rotor shaft 5 of the spinning rotor 3, however, are arranged in a separate from the rotor housing 15 drive housing 17 to this on the one hand from contamination both from the environment as well as from dirt and fly from the field of Spinning rotor 3 to protect. The rotor shaft 5 of the spinning rotor 3 thus extends from the rotor housing 15 into the drive housing 17.

Aufgrund der hohen Drehzahl des Spinnrotors 3 ist eine vollständige Abdichtung des Rotorgehäuses 15 gegen das Antriebsgehäuse 17 nicht möglich. Dies führt bei herkömmlichen Spinnvorrichtungen dazu, dass sich während des Spinnbetriebes auch im Antriebsgehäuse 17 ein Unterdruck aufbaut, was dann wiederum beim Öffnen des Rotorgehäuses 15 dazu führt, dass Luft und Verschmutzungen aus den Bereich des Rotorgehäuses 15 in das Antriebsgehäuse 17 eingesaugt werden. Um dies zu vermeiden, sind gemäß der Figur 1 das Rotorgehäuse 15 und das Antriebsgehäuse 17 in axialer Richtung des Rotorschafts 5 beabstandet zueinander in der Offenend-Spinnvorrichtung 1 angeordnet. Das Antriebsgehäuse 17 steht nun nicht mehr mit dem Rotorgehäuse 15 in direkter Verbindung, sondern lediglich mit einem nicht gegen den Umgebungsluftdruck pU abgedichteten Bereich der Offenend-spinnvorrichtung 1. Es wird somit während des Spinnbetriebs kein Unterdruck in dem Antriebsgehäuse 17 aufgebaut, so dass auch beim Öffnen des Rotorgehäuses 15 keine Verschmutzungen mehr in das Antriebsgehäuse 17 gesaugt werden können. Vorteilhaft ist es dabei, wenn die beiden Gehäuse 15 und 17 um einen Abstand von wenigstens 3 mm, bevorzugt wenigstens 5 mm, besonders bevorzugt wenigstens 10 mm zueinander aufweisen, um die Auswirkungen des im Rotorgehäuse 15 herrschenden Unterdrucks auf das Antriebsgehäuse 17 sicher zu vermeiden.Due to the high rotational speed of the spinning rotor 3, a complete sealing of the rotor housing 15 against the drive housing 17 is not possible. In the case of conventional spinning apparatuses, this results in a negative pressure also being built up in the drive housing 17 during spinning operation, which in turn causes the rotor housing 15 to open when opening the rotor housing 15, causing air and dirt from the area of the rotor housing 15 to enter the drive housing 17 be sucked. In order to avoid this, according to FIG. 1, the rotor housing 15 and the drive housing 17 are arranged spaced apart in the axial direction of the rotor shaft 5 in the open-end spinning device 1. The drive housing 17 is now no longer in direct communication with the rotor housing 15, but only with a not sealed against the ambient air pressure p U area of the open-end spinning device 1. It is thus constructed during the spinning operation no negative pressure in the drive housing 17, so that too when opening the rotor housing 15 no dirt can be sucked into the drive housing 17. It is advantageous if the two housings 15 and 17 by a distance of at least 3 mm, preferably at least 5 mm, more preferably at least 10 mm to each other to avoid the effects of prevailing in the rotor housing 15 negative pressure on the drive housing 17 safely.

Zwischen dem Rotorgehäuse 15 und dem beabstandet dazu angeordneten Antriebsgehäuse 17 ist eine Zwischenkammer 18 vorgesehen. Eine derartige Offenend-Spinnvorrichtung 1 mit dem Rotorgehäuse 15 und dem Antriebsgehäuse 17 wird im Folgenden anhand der Figuren 2 - 6 näher beschrieben, die eine Detaildarstellung einer Offenend-Spinnvorrichtung 1 in verschiedenen Ausführungen zeigen.Between the rotor housing 15 and spaced therefrom arranged drive housing 17, an intermediate chamber 18 is provided. Such an open-end spinning device 1 with the rotor housing 15 and the drive housing 17 will be described below with reference to FIG Figures 2 - 6 described in more detail, showing a detailed representation of an open-end spinning device 1 in various embodiments.

In Figur 2 ist wiederum der Rotor 3 mit der Rotortasse 4 und dem Rotorschaft 5 ersichtlich. Weiterhin ist eine in dem Deckel 27 des Rotorgehäuses 15 angeordnete Abzugsdüse 34 erkennbar, über welche das in der Rotortasse 4 erzeugte Garn 7 abgezogen wird. Im Bereich des Antriebsgehäuses 17 ist nun im Detail sowohl der Einzelantrieb 14 als auch die Lagerung 13 erkennbar. Vorliegend sind zwei Radiallager 25 vorgesehen, die als Magnetlager 25a ausgebildet sind. Weiterhin ist ein Axiallager 24 vorgesehen, das ein Axialmagnetlager oder ein Axialluftlager 24a oder ein aus beiden Lagerungsarten kombiniertes Axiallager 24 beinhalten kann. Vorliegend ist ein Axialluftlager 24a dargestellt, das über eine Druckluftquelle 31 gespeist wird und auf ein der Rotortasse 4 abgewandtes Ende des Spinnrotors 3 einwirkt.In FIG. 2 in turn, the rotor 3 with the rotor cup 4 and the rotor shaft 5 can be seen. Furthermore, a discharge nozzle 34 arranged in the cover 27 of the rotor housing 15 can be seen, via which the yarn 7 produced in the rotor cup 4 is drawn off. In the area of the drive housing 17, both the individual drive 14 and the mounting 13 can now be seen in detail. In the present case, two radial bearings 25 are provided which are designed as magnetic bearings 25a. Furthermore, a thrust bearing 24 is provided which may include an axial magnetic bearing or an axial air bearing 24a or a thrust bearing 24 combined from both types of bearings. In the present case is an axial air bearing 24a, which is fed via a compressed air source 31 and acts on a rotor cup 4 facing away from the end of the spinning rotor 3.

Weiterhin ist der Figur 2 entnehmbar, dass trotz der Anordnung von Ringdichtungen 21 jeweils ein Ringspalt zwischen aneinander grenzenden Gehäusen bzw. Kammern verbleibt. Um das Einsaugen von Luft aus den Bereich des Rotorgehäuses 15 in das Antriebsgehäuse 17 beim Öffnen des Rotorgehäuses 15 zu vermeiden, ist daher zwischen dem Rotorgehäuse 15 und dem Antriebsgehäuse 17 eine Zwischenkammer 18 angeordnet. Die Zwischenkammer 18 ist über eine Verbindungsöffnung 19 mit dem Rotorgehäuse verbunden und über eine zweite Verbindungsöffnung 20 mit dem Antriebsgehäuse 17. Um die Größe der Verbindungsöffnungen 19 und 20 dabei möglichst gering zu halten, ist jeweils eine Ringdichtung 21 im Bereich der beiden Ringspalte vorgesehen.Furthermore, the FIG. 2 removable, that in spite of the arrangement of ring seals 21 each have an annular gap between adjacent housings or chambers remains. In order to avoid the suction of air from the region of the rotor housing 15 in the drive housing 17 when opening the rotor housing 15, an intermediate chamber 18 is therefore arranged between the rotor housing 15 and the drive housing 17. The intermediate chamber 18 is connected to the rotor housing via a connection opening 19 and via a second connection opening 20 to the drive housing 17. In order to minimize the size of the connection openings 19 and 20, an annular seal 21 is provided in each case in the region of the two annular gaps.

Nach der in Figur 2 gezeigten Ausführung einer Offenend-Spinnvorrichtung weist nun die Zwischenkammer 18 eine dritte Öffnung 22 auf, die mit einer Unterdruckquelle 23 ständig in Verbindung steht. Beispielsweise kann die Zwischenkammer 18 über die maschinenlange Unterdruckleitung 33 mit der Unterdruckquelle 23 für den Spinnunterdruck pSUin Verbindung stehen. Vorliegend ist die Zwischenkammer 18 hierzu ebenfalls mit dem Unterdruckkanal 16 verbunden.After the in FIG. 2 shown embodiment of an open-end spinning device, the intermediate chamber 18 now has a third opening 22 which is constantly in communication with a vacuum source 23. For example, the intermediate chamber 18 can be connected via the machine-length vacuum line 33 to the vacuum source 23 for the spinning vacuum p SU . In the present case, the intermediate chamber 18 is also connected to the vacuum channel 16 for this purpose.

Während des Spinnbetriebs herrscht somit in dem Rotorgehäuse 15 der Spinnunterdruck pSU, während aufgrund des als Luftlager 24a ausgeführten Axiallagers 24 sich im Antriebsgehäuse 17 ein Druck PMG einstellt, der größer ist als der Spinnunterdruck pSU. Aufgrund des im Vergleich zum Luftdurchsatz durch den Unterdruckkanal 16 sehr geringen Luftdurchsatzes durch das Luftlager 24a liegt jedoch der Luftdruck PMG auch während des Spinnbetriebs stets unter dem die Spinnvorrichtung 1 umgebenden Umgebungsluftdruck PU. Aufgrund dessen stellt sich in der Zwischenkammer 18 ein Luftdruck PZK ein, der ebenfalls unterhalb des Umgebungsluftdruckes PU und zwischen dem Spinnunterdruck PSU sowie dem Luftdruck des Antriebsgehäuse PAG liegt. Es wird somit während des Spinnbetriebs ein Luftstrom aus dem Antriebsgehäuse in die Zwischenkammer erzeugt, der in vorteilhafter Weise bereits während des Spinnbetriebs das Eindringen von Verunreinigungen in das Antriebsgehäuse 17 verhindert.Thus, during the spinning operation, the spinning vacuum p SU prevails in the rotor housing 15, while due to the axial bearing 24 designed as air bearing 24 a, a pressure P MG which is greater than the spinning vacuum p SU is established in the drive housing 17. Due to the very low air flow through the air bearing 24a compared to the air flow through the vacuum channel 16, however, the air pressure P MG is always below the spinning device 1 surrounding ambient air pressure P U also during spinning operation. Because of this, an air pressure P ZK sets in the intermediate chamber 18, which is also below the ambient air pressure P U and between the spinning vacuum P SU and the air pressure of the drive housing P AG is located. It is thus generated during the spinning operation, an air flow from the drive housing into the intermediate chamber, which prevents the penetration of contaminants into the drive housing 17 advantageously already during the spinning operation.

Beim Öffnen des Rotorgehäuses 15 findet zwar nun in dem Rotorgehäuse 15 ein Druckangleich an den Umgebungsluftdruck PU statt. Etwaige Verunreinigungen aus dem Rotorgehäuse 17 werden nun jedoch aufgrund des in der Zwischenkammer anliegenden Unterdrucks PZK lediglich in die Zwischenkammer 18 gesaugt und aus dieser über die dritte Öffnung 22 in den Unterdruckkanal 16 abgeführt. Das Eindringen von Verunreinigungen aus dem Rotorgehäuse 15 in das Antriebsgehäuse 17 kann somit sowohl im Spinnbetrieb als auch beim Öffnen des Rotorgehäuses 15 vermieden werden.When the rotor housing 15 is opened, a pressure equalization to the ambient air pressure P U now takes place in the rotor housing 15. However, due to the vacuum P ZK present in the intermediate chamber, any impurities from the rotor housing 17 are only sucked into the intermediate chamber 18 and discharged from the latter via the third opening 22 into the vacuum channel 16. The penetration of contaminants from the rotor housing 15 in the drive housing 17 can thus be avoided both in spinning operation and when opening the rotor housing 15.

Die beschriebene Wirkung kann noch verbessert werden, wenn ähnlich wie in der Figur 3 die Zwischenkammer 18 über einen separaten Unterdruckkanal 16a mit der maschinenlangen Unterdruckleitung 33 oder einer sonstigen Unterdruckquelle 23 verbunden ist. Aufgrund des plötzliches Druckangleichs im Rotorgehäuse 15 an den Umgebungsluftdruck PU beim Öffnen des Rotorgehäuses 15 kann es auch in dem Unterdruckkanal 16 zu einem Druckangleich kommen, so dass die Zwischenkammer 18 nun nicht mehr ausreichend mit Unterdruck beaufschlagt werden kann. Durch einen Anschluss der Zwischenkammer 18 mittels eines eigenen Unterdruckkanals 16a kann der Unterdruck (Luftdruck PZK) in der Zwischenkammer 18 auch nach Öffnen des Rotorgehäuses 15 noch aufrechterhalten werden. Alternativ zu einem eigenen Unterdruckkanal 16a für die Zwischenkammer 18 ist es auch möglich, die dritte Öffnung 22 bzw. den Anschluss der Zwischenkammer 18 an den Unterdruckkanal 16 nahe an der maschinenlangen Unterdruckleitung 33 anzuordnen oder die Zwischenkammer 18 direkt an die maschinenlange Unterdruckleitung 33 anzuschließen. In diesem Bereich herrscht aufgrund der räumlichen Nähe zu der maschinenlangen Unterdruckleitung 33 auch beim Öffnen des Rotorgehäuses 15 noch ein ausreichender Unterdruck.The described effect can be improved even if similar to the FIG. 3 the intermediate chamber 18 is connected via a separate vacuum channel 16a to the machine-length vacuum line 33 or another vacuum source 23. Due to the sudden pressure equalization in the rotor housing 15 to the ambient air pressure P U when opening the rotor housing 15, pressure equalization may also occur in the vacuum duct 16, so that the intermediate chamber 18 can no longer be sufficiently pressurized with negative pressure. By connecting the intermediate chamber 18 by means of its own vacuum channel 16a, the negative pressure (air pressure P ZK ) in the intermediate chamber 18 can still be maintained even after the rotor housing 15 has been opened. As an alternative to a separate vacuum channel 16a for the intermediate chamber 18, it is also possible to arrange the third opening 22 or the connection of the intermediate chamber 18 to the vacuum channel 16 close to the machine-length vacuum line 33 or to connect the intermediate chamber 18 directly to the machine-length vacuum line 33. In this area prevails due to the spatial proximity to the machine-length vacuum line 33 even when opening the rotor housing 15 is still a sufficient negative pressure.

Figur 3 zeigt eine Abwandlung der Offenend-Spinnvorrichtung der Figur 2. Es wird daher im Folgenden lediglich auf die Unterschiede zur Vorrichtung der Figur 2 eingegangen; gleiche Elemente und Funktionsweisen werden nicht mehr gesondert beschrieben. Nach Figur 3 ist ebenfalls vorgesehen, dass die Zwischenkammer 18 über eine dritte Öffnung 22 mit einer Unterdruckquelle 23 in Verbindung steht. Aus den zu Figur 2 bereits ausgeführten Gründen des Druckangleichs auch in dem Unterdruckkanal 16 beim Öffnen des Rotorgehäuses 15 ist vorliegend die Zwischenkammer 18 ebenfalls über einen eigenen Unterdruckkanal 16a mit der Unterdruckquelle 23 verbunden. Natürlich könnte auch hier, je nach geometrischen Gegebenheiten der Offenend-Spinnvorrichtung 1, die Zwischenkammer 18 direkt mit der maschinenlangen Unterdruckleitung 33 verbunden sein. Im Unterschied zur Offenend-Spinnvorrichtung 1 der Figur 2 ist jedoch die dritte Öffnung 22 mit einem ansteuerbaren Absperrorgan 26 versehen, so dass die Zwischenkammer 18 nicht ständig mit der Unterdruckquelle 23 in Verbindung steht, sondern erst beim Öffnen des Deckels 27. Aufgrund der Verbindungsöffnungen 19 und 20 zu dem mit Spinnunterdruck PSU beaufschlagten Rotorgehäuse 15 stellt sich jedoch während des Spinnbetriebs auch in der Zwischenkammer 18 und in dem Antriebsgehäuse 17 ein Unterdruck ein. Nach vorliegender Darstellung ist hierzu entweder im Bereich des Deckels 27 des Rotorgehäuses 15 oder im Bereich des Schwenkgehäuses 29 ein Sensor 32 vorgesehen, welcher das Öffnen des Rotorgehäuses 15 registriert wird hierdurch das Absperrorgan 26 öffnet. Die Zwischenkammer 18 wird somit auch beim Öffnen des Deckels 27 des Rotorgehäuses 15 weiter mit einem Unterdruck beaufschlagt, der das Einsaugen von Verschmutzungen in das Antriebsgehäuse 17 verhindert. Etwaige Ablagerungen aus dem Bereich des Rotorgehäuses 15 werden nach dem Öffnen des Absperrorgans 26 ebenfalls über die dritte Öffnung 22 und den Unterdruckkanal 16a abgeführt. FIG. 3 shows a modification of the open-end spinning device of FIG. 2 , It is therefore referred to below only to the differences from the device FIG. 2 received; the same elements and functions are no longer described separately. To FIG. 3 It is likewise provided that the intermediate chamber 18 is connected via a third opening 22 to a vacuum source 23. Out of the too FIG. 2 already explained reasons of Druckangleichs in the vacuum channel 16 when opening the rotor housing 15 in the present case, the intermediate chamber 18 is also connected via its own vacuum channel 16a with the vacuum source 23. Of course, also here, depending on the geometric conditions of the open-end spinning device 1, the intermediate chamber 18 could be connected directly to the machine-length vacuum line 33. In contrast to the open-end spinning device 1 of FIG. 2 However, the third opening 22 is provided with a controllable obturator 26, so that the intermediate chamber 18 is not constantly in communication with the vacuum source 23, but only when opening the lid 27. Due to the connection openings 19 and 20 to the pressurized with spinning vacuum P SU rotor housing However, during the spinning operation, a negative pressure also occurs in the intermediate chamber 18 and in the drive housing 17. According to the present illustration, a sensor 32 is provided for this purpose either in the region of the cover 27 of the rotor housing 15 or in the region of the pivot housing 29, which registers the opening of the rotor housing 15, thereby opening the shut-off member 26. The intermediate chamber 18 is thus further subjected to a negative pressure during opening of the cover 27 of the rotor housing 15, which prevents the suction of dirt into the drive housing 17. Any deposits from the area of the rotor housing 15 are also removed via the third opening 22 and the vacuum channel 16a after opening the obturator 26.

Aufgrund dessen, dass die Zwischenkammer 18 beim Öffnen des Rotorgehäuses 15 in jedem Falle mit Spinnunterdruck PSU beaufschlagt ist, werden etwaige Verunreinigungen aus dem Rotorgehäuse 15 über den Unterdruckkanal 16a abgesaugt und gelangen nicht mehr bis in das Antriebsgehäuse 17. Das Eindringen von Verunreinigungen in das Antriebsgehäuse 17 kann somit bei sämtlichen Lagerungsarten vermieden werden. Allerdings kann diese Wirkung noch verstärkt werden, wenn, wie zu Figur 2 beschrieben, das Axiallager 24 als Axialluftlager 24a ausgebildet ist oder die Lagerung ein Luftlager beinhaltet. In diesem Falle herrscht in dem Antriebsgehäuse 17 stets ein höherer Luftdruck PAG als der Luftdruck PZK in der Zwischenkammer 18, wodurch wiederum das Einsaugen von Verunreinigungen vermieden wird.Due to the fact that the intermediate chamber 18 is acted upon in each case with spinning vacuum P SU when opening the rotor housing 15, any impurities are sucked out of the rotor housing 15 via the vacuum channel 16a and no longer reach into the drive housing 17. The penetration of impurities in the Drive housing 17 can thus be avoided in all types of storage. However, this effect can be exacerbated if, how to FIG. 2 described, the thrust bearing 24 is formed as Axialluftlager 24a or storage includes an air bearing. In this case prevails in the drive housing 17 is always a higher air pressure P AG than the air pressure P ZK in the intermediate chamber 18, which in turn the suction of impurities is avoided.

Figur 4 zeigt eine weitere Abwandlung der in Figur 2 dargestellten Offenend-Spinnvorrichtung 1 mit einer unterdruckbeaufschlagten Zwischenkammer 18, bei welcher die Zwischenkammer 18 über die dritte Öffnung 22 mit dem Unterdruckkanal 16 des Rotorgehäuses 15 in Verbindung steht. Um den zu Figur 2 bereits beschriebenen negativen Effekt des Druckangleichs im Unterdruckkanal 16 beim Öffnen des Rotorgehäuses 15 zu vermeiden, kann anstelle eines separaten Unterdruckkanals 16a auch vorgesehen sein, beim Öffnen des Rotorgehäuses 15 dieses gegen den Unterdruckkanal 16 zu verschließen. Das Rotorgehäuse 15 ist hierzu mit einem Absperrorgan 26 versehen, das seine Verbindung zum Unterdruckkanal 16 sperrt oder freigibt. Zur Ansteuerung des Absperrorgans 26 kann eine rein mechanische Kopplung mit dem Deckel 27 des Rotorgehäuses vorgesehen sein oder es kann ähnlich wie in Figur 3 gezeigt eine sensorgesteuerte Ansteuerung erfolgen. FIG. 4 shows a further modification of in FIG. 2 Open-end spinning device 1 shown with a vacuum-pressurized intermediate chamber 18, in which the intermediate chamber 18 communicates via the third opening 22 with the vacuum channel 16 of the rotor housing 15 in connection. In order to avoid the negative effect of the pressure equalization in the vacuum channel 16 already described for FIG. 2 when the rotor housing 15 is opened, instead of a separate vacuum channel 16a, it can also be provided to close it against the vacuum channel 16 when the rotor housing 15 is opened. The rotor housing 15 is for this purpose provided with a shut-off device 26 which blocks or releases its connection to the vacuum channel 16. For controlling the obturator 26, a purely mechanical coupling with the cover 27 of the rotor housing may be provided or it may be similar to FIG. 3 shown a sensor-controlled control done.

Vorliegend ist als Absperrorgan 26 ein Schieber 26a vorgesehen, der das Rotorgehäuse 15 und die Zwischenkammer 18 jeweils wechselnd mit dem Unterdruckkanal 16 verbindet. Im regulären Spinnbetrieb ist dabei das Rotorgehäuse 15 mit dem Unterdruckkanal 16 verbunden, so dass im Rotorgehäuse 15 in gewohnter Weise der Spinnunterdruck psu aufrechterhalten wird. Die Zwischenkammer 18 ist hingegen im regulären Spinnbetrieb gegen den Unterdruckkanal 16 verschlossen. Aufgrund der Verbindungsöffnung 19 zu dem Rotorgehäuse wird in der Zwischenkammer aber dennoch ein Unterdruck aufgebaut. Der Schieber 26a ist nun derart ansteuerbar, dass beim Öffnen des Rotorgehäuses 15 die Verbindung des Rotorgehäuses 15 zum Unterdruckkanal 16 verschlossen wird, während die dritte Öffnung 22 freigegeben wird und die Zwischenkammer 18 nun mit dem Unterdruckkanal 16 in Verbindung steht. Ein Druckangleich an den Umgebungsluftdruck PU findet somit nur im geöffneten Rotorgehäuse 15, nicht jedoch im Unterdruckkanal 16 statt, während die Zwischenkammer 18 nun über die dritte Öffnung 22 weiterhin mit Unterdruck beaufschlagt wird.In the present case, a slide 26 a is provided as a shut-off device 26, which alternately connects the rotor housing 15 and the intermediate chamber 18 to the vacuum passage 16. In regular spinning operation, the rotor housing 15 is connected to the vacuum channel 16, so that in the rotor housing 15 in the usual way, the spinning vacuum p su is maintained. The intermediate chamber 18, however, is in regular spinning operation against the Vacuum channel 16 closed. Due to the connection opening 19 to the rotor housing but a negative pressure is still built up in the intermediate chamber. The slider 26a is now controllable such that when opening the rotor housing 15, the connection of the rotor housing 15 is closed to the vacuum channel 16, while the third opening 22 is released and the intermediate chamber 18 is now in communication with the vacuum channel 16. A Druckangleich to the ambient air pressure P U thus takes place only in the open rotor housing 15, but not in the vacuum channel 16, while the intermediate chamber 18 is now also applied via the third opening 22 with negative pressure.

Vorteilhaft bei dieser Ausführung ist es, dass keine separate Unterdruckleitung 16a für die Zwischenkammer 18 erforderlich ist, um den Unterdruck in der Zwischenkammer 18 auch beim und nach dem Öffnen des Rotorgehäuses 15 aufrechtzuerhalten. Zudem wird dadurch, dass während des Spinnbetriebs die Zwischenkammer 18 gegenüber dem Unterdruckkanal 16 verschlossen ist, kein Luftstrom aus dem Rotorgehäuse 15 durch die Zwischenkammer 18 in den Unterdruckkanal 16 erzeugt, sondern es wird vielmehr ein vorteilhafter Luftstrom aus dem Antriebsgehäuse 17 durch die Zwischenkammer 18 in das Rotorgehäuse 15 erzeugt. Staubablagerungen in der Zwischenkammer 18 können dadurch weitgehend vermieden werden.It is advantageous in this embodiment that no separate vacuum line 16a for the intermediate chamber 18 is required to maintain the negative pressure in the intermediate chamber 18 during and after the opening of the rotor housing 15. In addition, characterized in that during the spinning operation, the intermediate chamber 18 is closed to the vacuum channel 16, no air flow from the rotor housing 15 through the intermediate chamber 18 in the vacuum channel 16 generated, but it is rather an advantageous air flow from the drive housing 17 through the intermediate chamber 18 in the rotor housing 15 generates. Dust deposits in the intermediate chamber 18 can be largely avoided.

Herrscht bei einer derartigen Lösung auch bei geöffnetem Rotorgehäuse 15 in der Zwischenkammer 18 der Spinnunterdurch PSU in voller Höhe, so wird auch bei geöffnetem Rotorgehäuse 15 kein Staub in das Antriebsgehäuse 17 eingesaugt, sondern vielmehr werden Verunreinigungen durch die Zwischenkammer 18 in den Unterdruckkanal 16 abgesaugt. Eine derartige Lösung ist daher abweichend von der in Figur 4 gezeigten Darstellung auch einsetzbar, wenn kein Axialluftlager 24a vorgesehen ist.In such a solution, even with the rotor housing 15 open in the intermediate chamber 18, the spinning unit passes through P SU at full height, so that no dust is sucked into the drive housing 17 even with the rotor housing 15 open, but rather impurities are sucked out of the vacuum chamber 16 through the intermediate chamber 18 , Such a solution is therefore different from the in FIG. 4 can also be used when no Axialluftlager 24a is provided.

Eine weitere Ausführung einer Offenend-Spinnvorrichtung 1 mit einer unterdruckbeaufschlagten Zwischenkammer 18, welche insbesondere für Lagerungen ohne Axialluftlager 24a einsetzbar ist, ist in Figur 5 gezeigt. Vorliegend ist die Zwischenkammer 18, wie in Figur 3 beschrieben, mittels eines eigenen Unterdruckkanals 16a mit einer Unterdruckquelle 23 verbunden. Alternativ ist es jedoch ebenso möglich, lediglich einen Unterdruckkanal 16 vorzusehen und das Rotorgehäuse 15 beim Öffnen gegen den Unterdruckkanal 16 mittels eines Absperrorgans 26 abzusperren. Bezüglich möglicher Ausführungen des Absperrorgans 26 wird auf die Ausführungen zu Figur 3 verwiesen.Another embodiment of an open-end spinning device 1 with a vacuum-loaded intermediate chamber 18, which in particular for storage can be used without axial air bearing 24a, is in FIG. 5 shown. In the present case, the intermediate chamber 18, as in FIG. 3 described, connected by means of its own vacuum channel 16a with a vacuum source 23. Alternatively, however, it is also possible to provide only one vacuum channel 16 and shut off the rotor housing 15 when opening against the vacuum channel 16 by means of a shut-off device 26. With regard to possible embodiments of the obturator 26 is to the comments too FIG. 3 directed.

Weiterhin ist das Antriebsgehäuse 17 mit einer Spülöffnung 35 versehen, über welche dem Antriebsgehäuse 17 temporär, vorzugsweise beim Öffnen des Rotorgehäuses 15, staubfreie Spülluft zugeführt werden kann, um in das Antriebsgehäuse 17 eventuell eingedrungene Verunreinigungen in die Zwischenkammer 18 auszuspülen. Um dem Antriebsgehäuse 17 gefilterte Umgebungsluft mit dem Umgebungsluftdruck pU zuzuführen, ist die Spülöffnung 35 mit einem Filter 30 versehen bzw. steht mit einem Filter 30 in Verbindung.Furthermore, the drive housing 17 is provided with a flushing opening 35, via which the drive housing 17 temporarily, preferably when opening the rotor housing 15, dust-free purging air can be supplied to flush into the drive housing 17 possibly penetrated impurities in the intermediate chamber 18. In order to supply the drive housing 17 filtered ambient air with the ambient air pressure p U , the flushing port 35 is provided with a filter 30 and communicates with a filter 30 in connection.

Nach der vorliegenden Darstellung ist an die Spülöffnung 35 eine Spülleitung 36 angeschlossen, welche wiederum mit einem Filter 30 versehen ist und während des Spinnbetriebs durch den Deckel 27 des Rotorgehäuses 15 verschlossen ist. Beim Öffnen des Rotorgehäuses 15 wird dann die Spülleitung 36 mit der Umgebungsluft verbunden, so dass dem Antriebsgehäuse 15 staubfreie Spülluft zugeführt wird. Da die Spülung lediglich bei geöffnetem Rotorgehäuse 15 erfolgt, kann die Spülöffnung 35 relativ großzügig dimensioniert sein, wodurch eine schnelle Durchspülung erreichbar ist.
Eine weitere Ausführung einer Offenend-Spinnvorrichtung 1, bei welcher das Eindringen von Verunreinigungen in das Antriebsgehäuse 17 vermieden wird, ist in Figur 6 gezeigt. Anders als in den Figuren 2 und 3 ist dabei die Zwischenkammer 18 ständig mit Umgebungsluftdruck PU beaufschlagt bzw. steht mit diesem in Verbindung. Es wird dabei bei dieser Spinnvorrichtung 1 eine Luftströmung durch die Zwischenkammer 18 von der dritten Öffnung 22 über die erste Verbindungsöffnung 19 in das Rotorgehäuse 15 erzeugt. Im Antriebsgehäuse 17 stellt sich daher auch im Spinnbetrieb kein Unterdruck ein, sondern abhängig von der dort eingesetzten Lagerungsart entweder ebenfalls der Umgebungsluftdruck PU oder aber bei Verwendung eines Axialluftlagers 24a ein gegenüber dem Umgebungsluftdruck PU erhöhter Luftdruck PAG. Abweichend von der gezeigten Darstellung mit einem Axialluftlager 24a ist es somit ebenso möglich, die gezeigte Spinnvorrichtung 1 in Verbindung mit anderen Lagerungsarten einzusetzen.According to the present illustration, a flushing line 36 is connected to the flushing opening 35, which in turn is provided with a filter 30 and is closed during the spinning operation by the cover 27 of the rotor housing 15. When opening the rotor housing 15, the purge line 36 is then connected to the ambient air, so that the drive housing 15 dust-free purge air is supplied. Since the flushing takes place only when the rotor housing 15 is open, the flushing opening 35 can be relatively generously dimensioned, as a result of which rapid flushing can be achieved.
A further embodiment of an open-end spinning device 1, in which the penetration of contaminants into the drive housing 17 is avoided, is in FIG. 6 shown. Unlike in the FIGS. 2 and 3 is the intermediate chamber 18 constantly subjected to ambient air pressure P U or is in communication with this. In this spinning apparatus 1, an air flow is generated through the intermediate chamber 18 from the third opening 22 via the first connection opening 19 into the rotor housing 15. in the Drive housing 17 is therefore no negative pressure in spinning operation, but depending on the storage used there either also the ambient air pressure P U or when using a Axialluftlagers 24a with respect to the ambient air pressure P U increased air pressure P AG . Notwithstanding the representation shown with an axial air bearing 24a, it is thus also possible to use the spinning device 1 shown in conjunction with other types of storage.

Dargestellt sind in Figur 6 ebenso wie in den Figuren 2 und 3 die Verhältnisse während des regulären Spinnbetriebs. Da sich während des Spinnbetriebs im Antriebsgehäuse 17 kein Unterdruck aufbaut, kann es auch beim Öffnen des Rotorgehäuses 15 nicht mehr zu einem Einsaugen von Luft mit entsprechenden Verschmutzungen kommen. Um weiterhin das Einsaugen von Verschmutzungen über die dritte Öffnung 22 und die Verbindungsöffnung 19 in das Rotorgehäuse 15 zu vermeiden, ist es vorteilhaft, wenn wie in Figur 6 gezeigt, die dritte Öffnung 22 mit einem Luftfilter 30 versehen ist.Shown in FIG. 6 as well as in the FIGS. 2 and 3 the conditions during the regular spinning operation. Since no negative pressure builds up during the spinning operation in the drive housing 17, it can no longer come to an intake of air with corresponding contaminants even when opening the rotor housing 15. In order to further avoid the suction of contaminants via the third opening 22 and the connection opening 19 in the rotor housing 15, it is advantageous if, as in FIG. 6 shown, the third opening 22 is provided with an air filter 30.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt. Abwandlungen und Kombinationen im Rahmen der Patentansprüche fallen ebenfalls unter die Erfindung.The invention is not limited to the illustrated embodiments. Variations and combinations within the scope of the claims also fall under the invention.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Offenend-SpinnvorrichtungOpen-end spinning device
22
RotorspinnmaschineRotor spinning machine
33
Spinnrotorspinning rotor
44
Rotortasserotor cup
55
Rotorschaftrotor shaft
66
Fasermaterialfiber material
77
Garnyarn
88th
Speisevorrichtungfeeder
99
Auflösevorrichtungdissolver
1010
Abzugsvorrichtungoff device
1111
Spulvorrichtungspooling device
1212
SpuleKitchen sink
1313
Lagerungstorage
1414
Einzelantriebindividual drive
1515
Rotorgehäuserotor housing
1616
UnterdruckkanalVacuum channel
1717
Antriebsgehäusedrive housing
1818
Zwischenkammerintermediate chamber
1919
erste Verbindungsöffnungfirst connection opening
2020
zweite Verbindungsöffnungsecond connection opening
2121
Ringdichtungring seal
2222
dritte Öffnungthird opening
2323
UnterdruckquelleVacuum source
2424
Axiallagerthrust
24a24a
AxialluftlagerAxialluftlager
2525
Radiallagerradial bearings
25a25a
RadialmagnetlagerRadial magnetic bearings
2626
Absperrorganshutoff
26a26a
Schieberpusher
2727
Deckel des RotorgehäusesCover of the rotor housing
2828
Dichtung des RotorgehäusesSeal of the rotor housing
2929
Schwenkgehäuseswivel case
3030
Luftfilterair filter
3131
DruckluftquelleCompressed air source
3232
Sensorsensor
3333
UnterdruckleitungVacuum line
3434
Abzugsdüsenavel
3535
Spülöffnungflushing opening
3636
Spülleitungflushing line
PU P U
UmgebungsluftdruckAmbient air pressure
pSU p SU
SpinnunterdruckSpinning vacuum
pAG p AG
Luftdruck im AntriebsgehäuseAir pressure in the drive housing
pZK p ZK
Luftdruck in der ZwischenkammerAir pressure in the intermediate chamber

Claims (15)

  1. Method to operate an open-end spinning device (1) of a rotor spinning machine (2), whereat the open-end spinning device (1) has a spinning rotor (3) being driven by means of an individual drive (14), being preferably arranged in a contactless way in a bearing (13), and having a rotor cup (4) and a rotor shaft (5), the rotor cup (4) of the spinning rotor (3) being arranged in a rotor housing (15) impinged with spinning negative pressure (pSU) during the spinning operation, and the rotor shaft (5) of the spinning rotor (3) extending in a drive housing (17) in which the drive and the bearing (13) of the spinning rotor (3) are arranged, characterized in that an air current from the rotor housing (15) to the drive housing (17) is prevented by arranging the rotor housing (15) and the drive housing (17) in the open-end spinning device (1) spaced apart from one another in axial direction of the rotor shaft (5) and that between the rotor housing (15) and the drive housing (17) an intermediate chamber (18) has been arranged with a first connecting opening (19) to the rotor housing (15), preferably around the rotor shaft (5), and a second connecting opening (20) to the drive housing (17), preferably around the rotor shaft (5), and that the intermediate chamber (18) has a third opening (22) via which the intermediate chamber (18) is impinged in such a way with negative pressure or surrounding air pressure (pU) at least when the spinning operation is interrupted that when the rotor housing (15) is opened, an air current is prevented from entering the drive housing (17), preferably an air current is generated from the drive housing (17) into the intermediate chamber (18).
  2. Method according to the preceding claim, characterized in that the intermediate chamber (18), is impinged with negative pressure, at least when the rotor housing (15) is opened, preferably already before the rotor housing (15) is opened, and very preferably all the time, in particular through a negative pressure channel (16) of the open-end spinning device (1) or with spinning negative pressure (pSU) through an own negative pressure channel (16a).
  3. Method according to one of the preceding claims, characterized in that the intermediate chamber (18) is in constant contact with the surrounding air pressure (pu).
  4. Method according to one of the preceding claims, characterized in that the bearing (13) of the spinning rotor (3) comprises an air bearing, especially an axial air bearing (24a), and that the air flowing through the air bearing is controlled in such a way that the air pressure (pAG) in the drive housing (17) is always greater than the air pressure (pZK) in the intermediate chamber (18).
  5. Method according to one of the preceding claims, characterized in that the intermediate chamber (18) is impinged with spinning negative pressure (pSU) through the negative pressure channel (16) of the open-end spinning device (1) or through an own negative pressure channel (16a), an air current being generated from the intermediate chamber (18) into the negative pressure channel (16, 16a), at least when the rotor housing (15) is opened.
  6. Method according to one of the preceding claims, characterized in that the surrounding air is filtered before it is fed into the intermediate chamber (18).
  7. Open-end spinning device (1) of a rotor spinning machine (2) to execute the method according to one of the preceding claims with a spinning rotor (3) with a rotor cup (4), in which fiber material (6) can be spun, and with a rotor shaft (5) through which the spinning rotor (1) can be driven and is arranged in a bearing (13), preferably contactless, with an individual drive (14) for driving the spinning rotor (3), with a rotor housing (15), in which the rotor cup (4) of the spinning rotor (3) is arranged and which is impinged with spinning negative pressure (psu) through a negative pressure channel (16) of the open-end spinning device (1), and with a drive housing (17), in which the rotor shaft (5) of the spinning rotor (3) extends and in which the individual drive (14) and the bearing (13) of the spinning rotor are arranged, characterized in that the rotor housing (15) and the drive housing (17) are arranged in the open-end spinning device (1) spaced apart from one another in an axial direction of the rotor shaft (5) and that an intermediate chamber (18) is arranged between the rotor housing (15) and the drive housing (17), in which case the intermediate chamber (18) has a first connecting opening (19) to the rotor housing (15) and a second connecting opening (20) to the drive housing (17), and in which case the intermediate chamber (18) has a third opening (22), through which the intermediate chamber (18) is connected to a negative pressure source (23) or to the surrounding air pressure (pU), at least when the spinning operation is interrupted, such that when the rotor housing (15) is opened, an air current is prevented from entering the drive housing (17).
  8. Open-end spinning device (1) according to the preceding claim, characterized in that the first connecting opening (19) and/or the second connecting opening (20) is/are executed around the rotor shaft (5) or around a collar of the rotor cup (4), especially as ring gap around the rotor shaft (5) or the collar of the rotor cup (4).
  9. Open-end spinning device (1) according to one of the two preceding claims, characterized in that the bearing (13) comprises an axial bearing (24) acting on the end of the spinning rotor (3) facing away from the rotor cup (4).
  10. Open-end spinning device (1) according to claim 9, characterized in that the axial bearing (24) is executed as axial air bearing (24a) or comprises at least one axial air bearing (24a).
  11. Open-end spinning device (1) according to one of the preceding claims 7 to 10, characterized in that the bearing (13) is a magnetic bearing, especially a radial magnetic bearing (25a) and/or comprises an axial magnetic bearing.
  12. Open-end spinning device (1) according to one of the preceding claims 7 to 11, characterized in that the intermediate chamber (18) is connected, preferably all the time, to the negative pressure channel (16) for the spinning negative pressure (pSU) or an own negative pressure channel (16a) through the third opening (22).
  13. Open-end spinning device (1) according to one of the preceding claims 7 to 12, characterized in that the third opening (22) and/or the rotor housing (15) is provided with a controllable shut-off device (26), in which case the shut-off device (26) can be activated preferably by opening and closing the rotor housing (15).
  14. Open-end spinning device (1) according to one of the preceding claims 7 to 13, characterized in that the third opening (22) is provided with an air filter (30).
  15. Open-end spinning device (1) according to one of the preceding claims 7 to 14, characterized in that the intermediate chamber (18) is in constant contact with the surrounding pressure (pU) through the third opening (22).
EP15171887.1A 2014-06-17 2015-06-12 Open end spinning machine with an intermediate chamber Active EP2957662B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014108526.4A DE102014108526A1 (en) 2014-06-17 2014-06-17 Open-end spinning device with an intermediate chamber

Publications (2)

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EP2957662A1 EP2957662A1 (en) 2015-12-23
EP2957662B1 true EP2957662B1 (en) 2019-01-02

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US (1) US9771670B2 (en)
EP (1) EP2957662B1 (en)
CN (1) CN105177775B (en)
DE (1) DE102014108526A1 (en)

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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
DE102017103622A1 (en) * 2017-02-22 2018-08-23 Rieter Cz S.R.O. Method for supporting a spinning rotor and bearing, spinning rotor and support bearings
DE102017104141A1 (en) * 2017-02-28 2018-08-30 Maschinenfabrik Rieter Ag Open-end spinning device with a coupling device for supply lines
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CN107904711B (en) * 2017-12-23 2023-02-07 盐城工业职业技术学院 A multistage rotatable fine and soft fibre gathers fine hair device that is spun for fibre that gathers
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CN108456955A (en) * 2018-03-26 2018-08-28 杭州三相科技有限公司 A kind of independent direct driving superspeed revolving cup structure and its cluster control system
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Also Published As

Publication number Publication date
US9771670B2 (en) 2017-09-26
CN105177775B (en) 2019-02-01
DE102014108526A1 (en) 2015-12-17
CN105177775A (en) 2015-12-23
US20150361593A1 (en) 2015-12-17
EP2957662A1 (en) 2015-12-23

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