Measure for influencing the axial flow in the spindle channel of an air-vortex spinning apparatus

Abstract

The measure for influencing the flow in the yarn guide duct is that the flow in the spindle channel is influenced after the fiber guide surface to the spindle cone and by the inlet opening into the spindle channel by means in such a way that the entrance behavior of the fiber ends and the spreading of the rear fiber ends occurs in weak or suppressed counter-flow or in co-flow and that said means are flow-active connections between the outflow channel and the spindle channel, e.g. passages by means of bores or by using fluid-permeable sintered materials.

1 . A method for influencing the air flow forming in the spindle channel of a spindle during the air-vortex spinning process by a flow-active connection of the spindle channel with the discharge air channel, characterized in that in this respect it concerns a dosed influencing of the air flow forming in the spindle channel, so that no fluid can emerge from the inlet opening of the spindle channel.  
     
     
         2 . The method as claimed in  claim 1 , characterized in that it concerns a stationary spindle.  
     
     
         3 . The method as claimed in  claim 1 , characterized in that a connection between the spindle and the discharge air channel is provided in such a way that fluid is not guided through the inlet opening from the spindle channel to the discharge air channel.  
     
     
         4 . The method as claimed in  claim 3 , characterized in that fluid is guided from the spindle channel to such an extent that fluid enters the inlet opening of the spindle channel.  
     
     
         5 . The method as claimed in  claim 3 , characterized by a flow-active connection of the spindle channel ( 45 ) with a fluid source ( 50 ) and/or a fluid sink ( 51 ).  
     
     
         6 . The method as claimed in  claim 5 , characterized in that fluid is introduced to such an extent into the spindle channel ( 45 ) and/or is sucked off to such an extent therefrom that no fluid emerges from the inlet opening ( 35 ) of the spindle channel ( 45 ).  
     
     
         7 . The method as claimed in  claim 5 , characterized in that fluid is introduced to such an extent into the spindle channel ( 45 ) and/or is sucked off to such an extent therefrom that fluid enters the inlet opening ( 35 ) of the spindle channel ( 45 ).  
     
     
         8 . An apparatus for performing the method according to  claim 1  to  7  for the dosed influencing of the air flow forming in the spindle channel ( 45 ) during the air-vortex spinning process, characterized in that at least one, preferably several up to a plurality of flow-active connecting passages ( 40 ) are provided between the spindle channel ( 45 ) and the discharge air channel ( 23 ).  
     
     
         9 . The apparatus as claimed in  claim 8 , characterized in that the connecting passages are bores ( 40 ) disposed in the spindle cone ( 33 ) of the spindle ( 32 ).  
     
     
         10 . The apparatus as claimed in  claim 9 , characterized in that the bores ( 40 ) are provided with an offset in the direction of the longitudinal axis ( 47 ) between the spindle channel ( 45 ) and the discharge air channel ( 23 ).  
     
     
         11 . The apparatus as claimed in one of the claims  9  or  10 , characterized in that a plurality of bores ( 40 ) are arranged in a radial-symmetrical fashion.  
     
     
         12 . The apparatus as claimed in  claim 9 , characterized in that the spindle ( 32 ) or the spindle cone ( 33 ) consists of a fluid-permeable sintered material.  
     
     
         13 . The apparatus as claimed in  claim 9 , characterized in that the spindle ( 32 ) or the spindle cone ( 33 ) consists of a fluid-permeable metallic sintered material.  
     
     
         14 . The apparatus as claimed in  claim 9 , characterized in that the spindle ( 32 ) or the spindle cone ( 33 ) consists of a fluid-permeable ceramic sintered material.  
     
     
         15 . The apparatus as claimed in one of the  claims 8  to  14 , characterized in that the flow-active connecting passages ( 40 ) are arranged in such a way that a flowactive zone extends from the inlet opening ( 35 ) of the spindle channel ( 45 ) via the spindle cone ( 33 ) at a length corresponding to 10 times the inlet opening diameter.  
     
     
         16 . The apparatus as claimed in  claim 15 , characterized in that the part of the spindle ( 32 ) with the flow-active zone is arranged in an exchangeable way.  
     
     
         17 . The apparatus as claimed in  claim 6 , characterized in that the at least one bore ( 40 ,  41 ) is inclined with respect to the axis (y) of the spindle channel ( 45 ).  
     
     
         18 . The apparatus as claimed in  claim 17 , characterized in that the at least one bore ( 40 ,  41 ) is inclined in such a way that fluid introduced through the same is provided with a direction component (+y) facing in the running direction of a yarn ( 46 ).  
     
     
         19 . The apparatus as claimed in one of the  claims 9  to  18 , characterized in that the at least one bore ( 40 ,  41 ) opens tangentially into the spindle channel ( 45 ), which occurs in such a way that fluid in the spindle channel ( 45 ) is provided with a swirl.  
     
     
         20 . The apparatus as claimed in one of the  claims 9  to  19 , characterized in that at least one feed channel ( 50 ,  51 ) is present which is used for feeding fluid into the at least one fluid channel ( 40 ) or for sucking off fluid from the at least one fluid channel ( 41 ).  
     
     
         21 . The apparatus as claimed in one of the  claims 9  to  20 , characterized in that the spindle ( 32 ) has a torpedo-like arrangement and is held through at least one brace ( 52 ,  53 ) in the fiber guide channel.  
     
     
         22 . The apparatus as claimed in one of the  claims 9  to  21 , characterized in that the spindle ( 32 ) comprises at least one concentrically arranged channel ( 50 ,  51 ) which is used for injecting fluid into or sucking fluid from at least one fluid channel ( 40 ,  41 ).  
     
     
         23 . The apparatus as claimed in  claim 22 , characterized in that the spindle ( 32 ) is provided with an arrangement so as to be rotatable about its axis.