Vortex pump

1. A non-chokable pump, comprising:

a pump casing; and

an impeller configured to be arranged within the pump casing, the impeller having blades configured to deliver solids-containing media,

wherein

the blades are arranged in bundles,

the blades have the same axial height profile from a radially inner region of the impeller to a radially outer region of the impeller,

a spacing of the blades within each of the bundles is smaller than a spacing of the bundles to one another,

a spacing between the impeller and a wall of the pump casing containing a pump inlet is

smaller than a diameter of the pump inlet, and

large enough that a ball having a diameter equal to the pump inlet diameter is passable from the pump inlet to the pump outlet by dipping a portion of the ball into a space between the bundles.

2. The non-chokable pump as claimed in claim 1 , wherein

each bundle has at least two blades.

3. The non-chokable pump as claimed in claim 2 , wherein

each bundle includes at most four blades.

4. The non-chokable pump as claimed in claim 3 , wherein

the spacing of the blades in each bundle is less than 90% of the spacing of the bundles to one another.

5. The non-chokable pump as claimed in claim 3 , wherein

the spacing of the blades in each bundle is less than 80% of the spacing of the bundles to one another.

6. The non-chokable pump as claimed in claim 3 , wherein

the spacing of the blades between the bundles is more than 60°.

7. The non-chokable pump as claimed in claim 3 , wherein

the spacing of the blades between the bundles is more than 80°.

8. The non-chokable pump as claimed in claim 4 , wherein

the spacing of the blades within each of the bundles is less than 70°.

9. The non-chokable pump as claimed in claim 4 , wherein

the spacing of the blades within each of the bundles is less than 50°.

10. The non-chokable pump as claimed in claim 1 , wherein

the impeller is formed integrally with the blades.

11. The non-chokable pump as claimed in claim 10 , wherein

at least one of the impeller and the blades is produced from a metallic material.

12. The non-chokable pump as claimed in claim 11 , wherein

the metallic material is a cast material.

13. The non-chokable pump as claimed in claim 1 , wherein

a spacing of a blade front of the blades at an outer radius of the impeller to a suction-side casing wall of the pump casing is less than 90% of a diameter of at least one of a pump casing inlet opening and a pump casing outlet opening.

14. The non-chokable pump as claimed in claim 13 , wherein

the spacing of the blade front of the blades is less than 80% of the diameter of the at least one of the pump casing inlet opening and the pump casing outlet opening.

15. The non-chokable pump as claimed in claim 3 , wherein

each bundle includes comprises an equal number of blades.

16. The non-chokable pump as claimed in claim 15 , wherein

the bundles are offset from one another by 180°.

17. The non-chokable pump as claimed in claim 3 , wherein

an angle of blade separation between the bundles is larger than an angle of the blade separation within the bundles by more than a factor of 1.2.

18. The non-chokable pump as claimed in claim 3 , wherein

an angle of blade separation between the bundles is larger than an angle of the blade separation within the bundles by more than a factor of 1.6.

19. The non-chokable pump as claimed in claim 3 , wherein

an angle of the blade separation between the bundles is not an integer multiple of an angle of the blade separation within the bundles.

20. The non-chokable pump as claimed in claim 1 , wherein

a height of the blades decreases in the radial direction at a bevel angle of more than 2° less than 8°.

21. The non-chokable pump as claimed in claim 1 , wherein

at least two of the blades have different curvatures.

22. The non-chokable pump as claimed in claim 1 , wherein

a curvature of all the blades is the same.

23. The non-chokable pump as claimed in claim 21 , wherein

the bevel angle is more than 3° less than 7°.