Vortex pump

Abstract

A non-chokable pump includes an impeller having vanes for delivering solids-containing media. At least a portion of the vanes include a vane section that branches from a vane extending from a hub region of the impeller. The vane section preferably has a curvature greater than the vane extending from the hub region.

Claims

1. A non-chokable pump, comprising: a pump housing; and an impeller arranged in the pump housing, the impeller having vanes configured to deliver solids-containing media, wherein at least in a portion of the vanes, at least one vane section branches off from an origin vane section of each of the portion of the vanes, the vanes are open in a direction facing toward an opposing wall of the pump housing that contains an inlet of the non-chokable pump, an open space exists between axial upper ends of the vanes and the opposing wall of the pump housing, the open space and a circumferential gap between at least a portion of the vanes are sized such that solids in the solids-containing media which are passable axially through the inlet of the non-chokable pump are passable radially through the impeller.

2. The non-chokable pump as claimed in claim 1, wherein the origin vane section is adjacent to a hub body of the impeller.

3. The non-chokable pump as claimed in claim 2, wherein a branch point at which at least one vane section branches off from a respective vane of the portion of the vanes is located within a first half of the respective vane.

4. The non-chokable pump as claimed in claim 3, wherein the branch point is located within a first third of the respective vane.

5. The non-chokable pump as claimed in claim 3, wherein the branching-off of the at least one vane section has a larger curvature than a curvature of in comparison with the respective vane from which the at least vane section branches-off.

6. The non-chokable pump as claimed in claim 5, wherein the vanes extend to an outer diameter of the impeller.

7. The non-chokable pump as claimed in claim 3, wherein at least one further vane section branches-off from the at least one vane section that branches-off from the respective vane.

8. The non-chokable pump as claimed in claim 1, wherein the vanes have a rearwardly curved profile.

9. The non-chokable pump as claimed in claim 1, wherein the impeller is formed in one piece as a rear shroud with the vanes.

10. The non-chokable pump as claimed in claim 9, wherein the impeller is formed from a metallic material.

11. The non-chokable pump as claimed in claim 9, wherein the metallic material is a cast material.

12. The non-chokable pump as claimed in claim 1, wherein spaces configured to receive the solids-containing media are formed between the vanes.

13. The non-chokable pump as claimed in claim 1, wherein all the vanes of the impeller are congruent.

14. The non-chokable pump as claimed in claim 1, wherein the vanes extend from an origin continuously in a radial direction.

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 the non-chokable impeller with three vanes of FIG. 1,

(3) FIG. 3 shows a plan view of the non-chokable impeller of FIG. 2,

(4) FIG. 4 shows a perspective illustration of a non-chokable impeller with two vanes in accordance with another embodiment of the present invention,

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

DETAILED DESCRIPTION OF THE DRAWINGS

(6) 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 in the form of a non-chokable impeller. Multiple vanes 7 are arranged on a rear shroud 6 of the impeller 2. A vane-free space 9 is formed between the impeller 2 and the inlet-side casing wall 8.

(7) 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 in the form of a suction cover.

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

(9) 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 vane front of the impeller 2. The spacing A is smaller than the diameter D.

(10) In the FIG. 1 embodiment, the height h of the vanes 7 decreases in a radial direction, with the result that the vane front has a slightly inclined or conical profile.

(11) FIG. 2 shows a perspective illustration of the impeller, which is in the form of a non-chokable impeller. The impeller 2 is an open radial impeller having no cover shroud.

(12) Three vanes 7 are arranged on the rear shroud 6. The vanes 7 are congruent. Each vane 7 has an origin vane section 12, which extends radially outward with a curvature from the hub body 4.

(13) A vane section 14 branches off from the origin vane section 12 from a branch point 13. Both the origin vane section 12 and the branching-off vane section 14 extend to the outer diameter of the impeller 2.

(14) The branch point 13 is situated at the height of the run-in radius 20 of the suction mouth 10, which is illustrated in FIG. 1.

(15) The vane sections 12, 14 have a profile which is curved counter to the direction of rotation. They have a rearwardly curved profile. The branching-off vane section 14 has a larger curvature in comparison with the origin vane section 12.

(16) FIG. 3 shows a plan view of the impeller 2 as per the illustration in FIG. 2. The three vanes 7 are arranged offset from one another by 120°. The vane sections 12, 14 have an angular spacing 15 of 40° at the outer diameter of the impeller 2.

(17) FIG. 4 shows a perspective illustration of an impeller 2, in which two vanes 7 are arranged on a rear shroud 6. The vanes 7 are arranged on the hub body 4 of the impeller 2 offset from one another by 180°. A vane section 14 branches off from the respective origin vane section 12 at a first branch point 13, from which vane section in turn there branches off a further vane section 17 from a second branch point 16. All the vane sections 12, 14, 17 extend to the outer diameter of the impeller 2.

(18) In the FIG. 4 embodiment, the impeller 2, which consists of the rear shroud 6 with the vanes 7 and the hub body 4, is formed in one piece. It consists of a cast material. Spaces 18 for dipping a ball are formed between the vanes 7. This ensures a ball passage that ensures delivery even of solids-containing media.

(19) FIG. 5 shows a plan view of the impeller 2 as per the illustration in FIG. 4. The angular spacing 15 between the vane sections 12 and 14 is preferably between 30° and 60°, the angular spacing 15 being approximately 45° in the exemplary embodiment. The angular spacing 19 between the vane sections 14 and 17 is preferably between 20° and 50°, the angular spacing being approximately 38° in the FIG. 4 embodiment. The vanes 7 are arranged offset from one another by an angle of 180°.

(20) 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.