Stator casing for eccentric worm pumps
The invention relates to a stator casing for eccentric worm pumps comprising an elastic lining, the cylindrical stator casing having a surface on the inner side, along the longitudinal axis whereof grooves are incorporated.
1. A stator casing for eccentric worm pumps comprising:
an inner surface having individual polygonal faces, and
an elastic lining, the elastic lining abutting the inner surface of the stator casing in an axially movable manner,
wherein at least one groove is inserted in the individual polygonal faces of the inner surface of the stator casing, the at least one groove reducing the adhesive effect between the elastic lining and the inner surface of the stator casing.
2. The stator casing of claim 1 , wherein the stator casing has a longitudinal axis, and wherein the grooves are disposed parallel to the longitudinal axis.
3. The stator casing of claim 2 , wherein groove depth to groove width has a ratio of 1:1.
4. The stator casing of claim 2 , wherein groove depth to groove width has a ratio of >1.
5. The stator casing of claim 1 , wherein the grooves are formed to be rectangular, V-shaped, round or angular in cross-section.
6. The stator casing of claim 1 , wherein groove depth to groove width has a ratio of 1:1.
7. The stator casing of claim 1 , wherein groove depth to groove width has a ratio of >1.
8. The stator casing of claim 7 , wherein the ratio of groove depth to groove width is 1.5:1.
9. The stator casing of claim 1 , wherein at least every other polygonal surface has grooves.
10. The stator casing of claim 1 , wherein the stator casing has a continuous slit.
11. The stator casing of claim 10 , wherein the slit is covered with a closure strip.
12. The stator casing of claim 11 , wherein the closure strip and the stator casing form longitudinal grooves.
13. The stator casing of claim 11 , wherein the closure strip consists of the same or different materials (plastic, aluminum, chromium nickel steel) as the stator casing.
14. The stator casing of claim 1 , wherein the stator casing has a closure strip extending along its longitudinal axis.
15. The stator casing of claim 1 , wherein the inner surface of the stator casing has an anti-adhesive coating.
16. The stator casing of claim 15 , wherein in that the anti-adhesive coating is PTFE varnish.
17. The stator casing of claim 1 , wherein the inner surface is roughened by sand blasting.
18. The stator casing of claim 1 , wherein the outer surface of the lining has an anti-adhesive coating.
19. The stator casing of claim 18 , wherein the anti-adhesive coating is PTFE varnish.
20. The stator casing of claim 1 , wherein the outer surface of the stator casing is provided with ribs along the longitudinal axis.