Impeller Wheel of a Centrifugal Pump

Abstract

An impeller wheel, in particular for a centrifugal pump, has in at least one side view perpendicular to a rotary axis outer contour that is spaced apart radially from the rotary axis, the outer contour comprising a first contour line which is inclined relative to the rotary axis by a first angle, and comprising a second contour line which directly follows the first contour line and is inclined relative to the rotary axis by a second angle, the second angle being by at least 0.05° and maximally 2° smaller than the first angle.

Claims

1. An impeller wheel, in particular for a centrifugal pump, having in at least one side view perpendicular to a rotary axis an outer contour that is spaced apart radially from the rotary axis, the outer contour comprising a first contour line which is inclined relative to the rotary axis by a first angle, and comprising a second contour line which directly follows the first contour line and is inclined relative to the rotary axis by a second angle, the second angle being by at least 0.05° and maximally 2° smaller than the first angle.

2. The impeller wheel to claim 1, wherein viewed along a flow-in direction, the first contour line is situated upstream of the second contour line.

3. The impeller wheel according to claim 1, wherein the side view a first extension of the first contour line parallel to the rotary axis is at least 20% and maximally 50% of a second extension of the second contour line parallel to the rotary axis.

4. The impeller wheel according to claim 3, wherein the first extension amounts to 33% of the second extension.

5. The impeller wheel according to claim 1, wherein the second angle at least 5° and maximally 60°.

6. The impeller wheel according to claim 1, wherein the second angle smaller than the first angle by 0.2°.

7. A centrifugal pump with an impeller wheel according to claim 1.

Description

[0017] Further advantages will become apparent from the following description of the drawing. In the drawing one exemplary embodiment of the invention is illustrated. The drawing, the description and the claims contain a plurality of features in combination. Someone skilled in the art will purposefully also consider the features separately and will find further advantageous combinations.

[0018] It is shown in:

[0019] FIG. 1 a centrifugal pump with an impeller wheel in a partial sectional view.

[0020] FIG. 1 shows a portion of a centrifugal pump 20 in a side view. The centrifugal pump 20 serves for conveying a fluid (not shown). The centrifugal pump 20 comprises a conveying unit 22. The conveying unit 22 has an entry opening 24. The entry opening 24 serves for letting a fluid pass that flows into the centrifugal pump 20 along a flow-in direction 18. The conveying unit 22 has an exit opening 26. The exit opening 26 serves for letting a fluid pass that flows out of the centrifugal pump 20.

[0021] The centrifugal pump 20 comprises an impeller wheel 10. The impeller wheel 10 comprises an impeller wheel vane 28. The impeller wheel vane 28 is realized in a plate shape. The impeller wheel 10 has a third contour line 34. The third contour line 34 faces the fluid that flows into the centrifugal pump 20. The impeller wheel 10 has a fourth contour line 36. The fourth contour line 36 faces the fluid that flows out of the centrifugal pump 20.

[0022] The centrifugal pump 20 comprises a shaft 30. The shaft 30 serves for driving the impeller wheel 10. The impeller wheel 10 comprises a shaft receptacle 32. The shaft receptacle 32 is embodied as a hub. The shaft receptacle 32 defines a rotary axis 12. The impeller wheel 10 is supported rotatably around the rotary axis 12. A view direction of the side view extends perpendicularly to the rotary axis 12.

[0023] The impeller wheel 10 has an outer contour that is radially spaced apart from the rotary axis 12. The outer contour comprises a first contour line 14. The first contour line 14 directly follows the third contour line 34. The first contour line 14 is inclined by a first angle 38 relative to the rotary axis 12. The first angle 38 is approximately 40°.

[0024] The outer contour comprises a second contour line 16. The second contour line 16 directly follows the fourth contour line 36. The second contour line 16 directly follows the first contour line 14. Viewed along the flow-in direction 18, the first contour line 14 is situated upstream of the second contour line 16. The second contour line 16 is inclined by a second angle 40 relative to the rotary axis 12, in the same direction. The second angle 40 is smaller than the first angle 38 by 0.2°. The second angle 40 is approximately 39.8°.

[0025] The first contour line 14 has a first extension parallel to the rotary axis 12. The second contour line 16 has a second extension parallel to the rotary axis 12. The first extension amounts to 33% of the second extension.

[0026] Alternatively, the first angle 38 and the second angle 40 may have other values, wherein the second angle 40 is at least 5° and maximally 60° and is smaller than the first angle 38 by at least 0.05° and by maximally 2°. Depending on the angles 38, 40 selected for the contour lines 14, 16, the ratio of the extensions of the contour lines 14, 16 with respect to the rotary axis 12 may change.

REFERENCE NUMERALS

[0027] 10 impeller wheel [0028] 12 rotary axis [0029] 14 first contour line [0030] 16 second contour line [0031] 18 flow-in direction [0032] 20 centrifugal pump [0033] 22 conveying unit [0034] 24 entry opening [0035] 26 exit opening [0036] 28 impeller wheel vane [0037] 30 shaft [0038] 32 shaft receptacle [0039] 34 third contour line [0040] 36 fourth contour line [0041] 38 first angle [0042] 40 second angle