Eccentric screw machine with asymmetrical projections
An eccentric screw machine ( 10 ) demonstrates a Stator ( 11 ) having an inner lining ( 17 ), which demonstrates teeth projecting inwards. The tips of these teeth are provided with micro-ribs ( 26 to 29 ), which are embodied asymmetrically with respect to the radials (R). They preferably demonstrate a flatly rising edge ( 30 ) and a steeply falling edge ( 31 ). This thus results in improved operating performance, depending on the direction of rotation.
1. Eccentric screw machine ( 10 ), especially for sludgy media,
comprising a stator ( 11 ), which demonstrates a channel ( 15 ) delimited by an elastomeric material,
wherein the channel ( 15 ) has a cross section which demonstrates a maximum radius (R 1 ) at at least two locations ( 18 , 19 ) separated from one another in the circumferential direction (U) and demonstrates inward protuberances ( 20 , 21 ) between them,
wherein other projections ( 26 - 29 ) are arranged on the inward protuberances ( 20 , 21 ),
further comprising a rotor ( 22 ), which is arranged in the channel ( 15 ) of the stator ( 11 ) to delimit at least one chamber,
characterized in that
the other projections ( 26 - 29 ) are embodied asymmetrically relative to the radial direction (R),
wherein the other projections ( 26 , 27 , 28 , 29 ) relative to one direction of rotation of the rotor ( 22 ) are asymmetric in the same direction; and
wherein the other projections ( 26 , 27 , 28 , 29 ) demonstrate a leading edge ( 30 ) with respect to the rotation of the rotor ( 22 ) and that said leading edge is more flatly inclined than its trailing edge ( 31 ).
2. The eccentric screw machine according to claim 1 , characterized in that the at least two locations ( 18 , 19 ) which are separated from one another in the circumferential direction (U) and define the maximum radius (R 1 ) are formed by helical grooves, which extend along the stator ( 11 ) and wind around its centerline ( 12 ).
3. The eccentric screw machine according to claim 1 , characterized in that the other projections ( 26 - 29 ) extend along the protuberances ( 20 , 21 ).
4. The eccentric screw machine according to claim 1 , characterized in that the other projections ( 26 , 27 , 28 , 29 ) are micro-ribs.
5. The eccentric screw machine according to claim 1 , characterized in that the other projections ( 26 , 27 , 28 , 29 ) demonstrate a length (L 1 +L 2 ) which, as measured in the circumferential direction (U), is substantially smaller than the length of the inward protuberance ( 20 , 21 ) measured in the same circumferential direction.
6. The eccentric screw machine according to claim 1 , characterized in that the other projections ( 26 , 27 , 28 , 29 ) demonstrate a height which, as measured in the radial direction (R), is substantially smaller than the height of the inward protuberance ( 20 , 21 ) likewise measured in the radial direction (R).
7. The eccentric screw machine according to claim 1 , characterized in that the stator ( 11 ) demonstrates at least one of the other projections ( 26 , 27 , 28 , 29 ) on each inward protuberance ( 20 , 21 ).
8. The eccentric screw machine according to claim 7 , characterized in that the stator ( 11 ) demonstrates a plurality of other projections ( 26 , 27 , 28 , 29 ) on each inward protuberance ( 20 , 21 ).
9. The eccentric screw machine according to claim 1 , characterized in that the leading edge ( 30 ) as measured in the circumferential direction (U) is longer than the trailing edge ( 31 ).
10. The eccentric screw machine according to claim 1 , characterized in that a border having a corrugated course delimits a cross section of the stator ( 11 ) in such a manner that the inward protuberances ( 20 , 21 ) in the channel ( 15 ) form teeth that run a screw-shaped course similarly to a helical-cut hollow wheel.
11. The eccentric screw machine according to claim 10 , characterized in that the rotor ( 22 ) has the shape of a single-tooth or multi-tooth, helical-geared pinion and is adapted to the shape of the channel ( 15 ) in such a manner that it can roll off the wall of same.
12. The eccentric screw machine according to claim 11 , characterized in that the teeth of the rotor ( 22 ) sealingly engage liner ( 17 ) of the stator ( 11 ).
13. The eccentric screw machine according to claim 1 , characterized in that each inward protuberance ( 20 , 21 ) bears an even number of the other projections ( 26 , 27 , 28 , 29 ).
14. The eccentric screw machine according to claim 1 , characterized in that each inward protuberance ( 20 , 21 ) bears an odd number of the other projections ( 26 , 27 , 28 and 29 ).
15. Eccentric screw machine ( 10 ), especially for sludgy media,
comprising a stator ( 11 ), which demonstrates a channel ( 15 ) delimited by an elastomeric material,
wherein the channel ( 15 ) has a cross section which demonstrates a maximum radius (R 1 ) at at least two locations ( 18 , 19 ) separated from one another in the circumferential direction (U) and demonstrates inward protuberances ( 20 , 21 ) between them,
wherein other projections ( 26 - 29 ) are arranged on the inward protuberances ( 20 , 21 ),
further comprising a rotor ( 22 ), which is arranged in the channel ( 15 ) of the stator ( 11 ) to delimit at least one chamber,
characterized in that
the other projections ( 26 - 29 ) are embodied asymmetrically relative to the radial direction (R), and
wherein the other projections ( 26 , 27 , 28 , 29 ) have a leading edge ( 30 ) with respect to the rotation of the rotor ( 22 ) and that said leading edge is more flatly inclined than a trailing edge ( 31 ).
16. The eccentric screw machine according to claim 15 characterized in that the leading edge ( 30 ) as measured in the circumferential direction (U) is longer than the trailing edge ( 31 ).