Vortex pump

Abstract

A vortex pump with an impeller is provided. The impeller includes blades for delivering solids-containing media which are arranged in bundles. The spacing the blades in the bundles is smaller than the spacing of the bundles from each other.

Claims

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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a schematic meridional section through a non-chokable pump in accordance with the present invention.

(2) FIG. 2 shows a perspective illustration of a non-chokable impeller with two bundles which each have two blades in accordance with the present invention.

(3) FIG. 3 shows a plan view of the non-chokable impeller according to the illustration in FIG. 2.

(4) FIG. 4 shows a perspective illustration of a non-chokable impeller with two bundles which each have three blades in accordance with the present invention.

(5) FIG. 5 shows a plan view of the non-chokable impeller according to the illustration in FIG. 4.

(6) FIG. 6 shows an arrangement of a non-chokable impeller in a pump casing in accordance with the present invention.

(7) FIG. 7 shows a plan view of a non-chokable impeller with a section line A-A in accordance with the present invention.

(8) FIG. 8 shows a sectional illustration along the line A-A of the non-chokable impeller illustrated in FIG. 7.

DETAILED DESCRIPTION OF THE DRAWINGS

(9) FIG. 1 illustrates a non-chokable pump, in the casing 1 of which an impeller 2 is positioned. The impeller 2 is connected rotationally conjointly to a shaft (not illustrated in FIG. 1). A hub body 4 which has a bore 5 for screwing in a screw serves for the fastening of the impeller 2. The impeller 2 is designed as a non-chokable impeller. Multiple blades 7 are arranged on a support plate 6 of the impeller 2. A blade-free space 9 is formed between the impeller 2 and the inlet-side casing wall 8.

(10) The suction mouth 10 is formed by a suction-side casing part 11. The suction mouth 10 forms an inlet for the solids-containing medium and has a diameter D. The suction-side casing part 11 is formed as a suction cover.

(11) The impeller 2 is arranged in a pump casing 15.

(12) The front side of the non-chokable impeller 2 has, at its outer edge, a spacing A to the inner side of the suction-side casing part 11. Here, the spacing A is preferably defined as the distance which a normal, which is perpendicular to the suction-side casing wall 8, has from the outer edge of the blade front of the impeller 2. The spacing A is smaller than the diameter D.

(13) The height h of the blades 7 decreases in the radial direction, with the result that the blade front has a slightly inclined or conical profile.

(14) FIG. 2 shows a perspective illustration of the impeller 2, which is designed as a non-chokable impeller. The impeller 2 is an open radial impeller having no cover plate.

(15) Two bundles 12 of blades 7 are arranged on the support plate 6. Each bundle 12 comprises in each case two blades 7. The two bundles 12 are arranged on the hub body 4 of the impeller 2 so as to be offset from one another by 180.

(16) FIG. 3 shows a plan view of the impeller 2 according to the illustration in FIG. 2. The spacing 13 between the bundles has an angle of the blade separation of 120. The spacing 14 of the blades 7 within the bundles 12 has an angle of the blade separation of 60. The angles blade separation between the bundles 12 are thus larger than the angles of the blade separation within the bundles by a factor of 2. The angles of the blade separation between the bundles 12 are an integer multiple of the angles of the blade separation within the bundles 12.

(17) FIG. 4 shows a perspective illustration of an impeller 2, in which two bundles 12 of blades 7 are arranged on a support plate 6, wherein each bundle 12 comprises in each case three blades 7. The two bundles are arranged on the hub body 4 of the impeller 2 so as to be offset from one another by 180.

(18) FIG. 5 shows a plan view of the impeller 2 according to the illustration in FIG. 4. The spacing 13 between the bundles 12 has an angle of the blade separation of 84. The spacing 14 of the blades 7 within the bundles 12 has an angle of the blade separation of 48. The angles of the blade separation between the bundles are thus larger than the angles of the blade separation within the bundles 12 by a factor of 1.75. Consequently, the angles of the blade separation between the bundles 12 are not an integer multiple of the angles of the blade separation within the bundles 12.

(19) FIG. 6 shows a view into the non-chokable pump, in which an impeller 2 is arranged in the pump casing part 15. The casing is a volute casing. The solids-containing medium exits the non-chokable pump through a discharge connector 17.

(20) FIG. 7 shows the impeller 2 according to the illustration in FIG. 6 with a section line A-A. A section along this line A-A is illustrated in FIG. 8. The height h of the blades 7 decreases in the radial direction, that is to say toward the impeller outer diameter. The decrease is in relation to a reference plane 16, which is partially illustrated by dashed lines in FIG. 8. In the exemplary embodiment, the decrease occurs at a bevel angle of 5.

(21) FIG. 8 shows a ball 18 in an upper and a lower position. The ball 18 has a diameter d and a radius a. According to the lower position of the ball 18, the ball 18 dips by a depth b into the spaces of the impeller 2 between the bundles 12. This dipping segment of the ball has a secant c.

(22) Due to arrangement according to the invention of the blades 7 in bundles 12, it is possible for a ball which has a diameter d which corresponds to the diameter of the suction mouth D to dip by a depth b into the spaces between the bundles 12. This allows the spacing A of the blade front to the suction-side casing wall 11 to be reduced in comparison with the diameter d by this depth b, with the result that the non-chokable pump has higher efficiency and still ensures the maximum ball passage d of the diameter D of the suction mouth 10. The following relationship exists between the spacing A, the depth b and the diameter D:
A+b=D(formula 1).

(23) The depth can be calculated as follows:

(24) $\begin{array}{cc}b=a-\sqrt{a^2-{\left(\frac{c}{2}\right)}^2}.& \left(\mathrm{formula}2\right)\end{array}$

(25) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.