Bearing Arrangement for Guiding a Motor Shaft of a Vertical Turbine Pump

Abstract

A bearing arrangement for guiding a motor shaft for supporting axial and/or radial forces of a vertical turbine pump. The bearing arrangement includes a bearing comprising an inner ring which can be non-rotatably connected to the motor shaft and an outer ring, an oil sump filled with an oil, within which the bearing is arranged at least partially immersed in the oil, and an inner oil deflector which is non-rotatably connected to the inner ring and deflects oil conveyed between the inner ring and the outer ring back into the oil sump as a result of rotation of the bearing.

Claims

1. A bearing arrangement for guiding a motor shaft and/or for supporting axial and/or radial forces of a vertical turbine pump, the bearing arrangement comprising: a bearing comprising an inner ring which can be non-rotatably connected to the motor shaft, and an outer ring; an oil sump filled with an oil, within which the bearing is arranged at least partially immersed in the oil; and an inner oil deflector which is non-rotatably connected to the inner ring and deflects oil conveyed between the inner ring and the outer ring as a result of a rotation of the bearing back into the oil sump.

2. The bearing arrangement according to claim 1, wherein the inner oil deflector at least one of extends radially outwardly from the inner ring or, in an axial plan view, annularly around the inner ring.

3. The bearing arrangement according to claim 1, wherein the inner oil deflector, in an axial side view, is arranged above the oil sump and extends at least one of from the inner ring in an umbrella-shaped manner and/or axially obliquely downward and radially away in the direction of the oil sump.

4. The bearing arrangement according to claim 1, comprising an outer wall which radially delimits the oil sump and on the outside of which a plurality of cooling fins are formed.

5. The bearing arrangement according to claim 1, comprising an outer oil deflector which is non-rotatably connected to the outer ring and is arranged axially above the inner oil deflector with respect to the oil sump.

6. The bearing arrangement according to claim 5, wherein the outer oil deflector extends at least one of radially inwardly or, in an axial plan view, extends annularly around the inner ring.

7. The bearing arrangement according to claim 1, comprising an outer wall which radially delimits the oil sump and at which the outer ring is provided, wherein a collecting pan for collecting the oil deflected by the inner oil deflector which, in an axial plan view, extends around the outer ring, is provided between the outer wall and the outer ring.

8. The bearing assembly according to claim 7, wherein a plurality of spaced apart axially extending connecting openings for draining oil collected in the collecting pan into the oil sump are provided between the collecting pan and the oil sump.

9. The bearing arrangement according to claim 1, wherein the bearing is designed as at least one of a radial bearing, an axial bearing or an angular ball bearing.

10. A vertical turbine pump, comprising: a riser pipe extending along an axis; a motor shaft arranged in the riser pipe; a motor arranged at an upper riser pipe end and driving the motor shaft; an impeller disposed at an opposite lower riser pipe end and driven by the motor shaft for conveying a fluid into the riser pipe; and a bearing arrangement guiding the motor shaft according to claim 1.

11. The vertical turbine pump according to claim 10, comprising a pressure-side manifold connected to the riser pipe at a first manifold end facing the impeller and comprising a curvature continuously away from the axis and an outlet at an opposite second manifold end for the fluid conveyed, wherein a radial diameter as height of the manifold initially decreases from the first manifold end towards the second manifold end and subsequently increases.

12. The vertical turbine pump according to claim 11, wherein the radial diameter first steadily decreases and thereupon steadily increases.

13. The vertical turbine pump according to claim 11, wherein an axial diameter as a width of the manifold first increases and then decreases from the first manifold end toward the second manifold end.

14. The vertical turbine pump according to claim 11, wherein a cross-section of the manifold in the course between the first manifold end and the second manifold end is always the same.

15. The vertical turbine pump according to claim 11, comprising a drive lantern provided between the motor and the manifold and comprising a coupling provided between the motor and the motor shaft, wherein the drive lantern and the manifold including a manifold housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In the following, the invention is explained in more detail with reference to the accompanying drawings based on preferred exemplary embodiments.

[0042] In the drawings:

[0043] FIG. 1 is a schematic cross-sectional view of a vertical turbine pump according to a preferred exemplary embodiment of the invention;

[0044] FIG. 2 is a schematic cross-sectional view of a bearing arrangement for guiding a motor shaft of the vertical turbine pump according to FIG. 1 in accordance with the preferred exemplary embodiment of the invention; and

[0045] FIG. 3 is a schematic perspective partial cross-sectional view of the bearing arrangement for guiding the motor shaft of the vertical turbine pump according to FIG. 2 in accordance with the preferred exemplary embodiment of the invention.

DETAILED DESCRIPTION OF THE EMBODIMENT EXAMPLES

[0046] FIG. 1 shows a schematic cross-sectional view of a vertical turbine pump 1 comprising a manifold housing 2 comprising a manifold 3 according to a preferred exemplary embodiment of the invention.

[0047] The vertical turbine pump 1 comprises a riser pipe 5 extending along an axis 4, having a circular outer cross-section and comprising a plurality of interconnected segments. A motor shaft 6 extends centrally in the metal riser pipe 5 along the axis 4 and along the entire length of the riser pipe 5 in such a way that a free space is formed radially around the motor shaft 6 between the latter and the riser pipe 5, through which fluid conveyed by the vertical turbine pump 1 rises axially. For this purpose, several impellers 8 arranged axially one above the other are provided at a lower riser pipe end 7, which are driven by the motor shaft 6, draw in the fluid and convey it into the free space.

[0048] The upper riser end 9 of the riser pipe 5 is attached to a base plate 10 so that the riser pipe 5 extends vertically downwards away from the base plate 10. Above the base plate 5, vertically or in the upward direction of the axis 4, first the manifold housing 2 adjoins, which in turn is axially adjoined by a drive lantern 11 and finally by a motor 12 driving the motor shaft 6. A coupling 13 is arranged in the drive lantern 11, which coupling is connected between the motor 12 and the motor shaft 6. The manifold housing 2 and the drive lantern 11 are designed in two parts and are screwed together. The upper riser pipe end 9 is connected in a fluid-tight manner to a first manifold end 14 of the manifold 3, which accordingly faces the impeller 8.

[0049] The manifold 3 comprises an outlet 16 for the conveyed fluid at a second manifold end arranged opposite the first manifold end 14. The tubular manifold 3 diverts the conveyed fluid from the vertical to the horizontal, so that cross-sectional surfaces at the first manifold end 14 and the second manifold end 15 are arranged offset from each other by 90?. For this purpose, the inner cross-sectional surfaces of the two manifold ends 14, 15 are of equal size on the one hand and circular on the other.

[0050] Inside the manifold housing 2, the motor shaft 6 is guided by a bearing arrangement 17 shown in detail in FIGS. 2 and 3, which is fixedly connected to the manifold housing 2. The bearing arrangement 17 comprises a bearing 18, which is designed as an angular ball bearing, in particular as a tapered roller bearing. An inner ring 19 of the bearing 18 is non-rotatably connected to the motor shaft 6 and rotates accordingly with the motor shaft 6, which is not shown in FIGS. 2 and 3. The bearing 18 extends radially circumferentially around the motor shaft 6. An outer ring 20 is non-rotatably connected to the manifold housing 2.

[0051] The bearing arrangement 17 further comprises an oil sump 21 arranged vertically or axially with respect to the axis 4 below the bearing 18 and extending likewise radially circumferentially around the motor shaft 6. The oil sump 21 is filled with oil, which is not shown, in such a way that the bearing 18, including the inner ring 19 and the outer ring 20, is completely covered with oil.

[0052] Finally, the bearing arrangement 17 comprises an inner oil deflector 22 which is non-rotatably connected to the inner ring 19 and extends radially away from the motor shaft 6. The inner oil deflector 22 is arranged vertically or with respect to the axis 4 axially above and at a distance from the bearing 18 and, in an axial plan view, is of disc-like design, enclosing the motor shaft 6 centrally. In an axial side view, the inner oil deflector 22 has an umbrella-like shape, as can be seen in FIG. 2, since the inner oil deflector 22 first extends axially away from the motor shaft 6, axially overlapping the bearing 18, and is then bent downward in a quarter-circle-like manner toward the oil sump 21.

[0053] A rotary motion of the motor shaft 6 causes the tapered rollers of the bearing 18 to rotate. Due to the centrifugal force, oil located in the bearing 18 is conveyed by the tapered rollers on the oil sump 21 between the inner ring 19 and the outer ring 20 diagonally upward in a pump-like manner away from the motor shaft 6, as indicated in FIG. 3 by arrows 23. Since the inner oil deflector 22, which is curved umbrella-like or soup plate-like, is arranged axially above the bearing 18, the oil thus conveyed hits on the inner oil deflector 22, which deflects the oil axially downward so that the deflected oil drips downward at the quarter-circle-like end of the inner oil deflector 22.

[0054] Axially below the curved portion of the inner oil deflector 22, an annular collecting pan 24 extending around the motor shaft 6 in axial plan view is provided for collecting the oil deflected by the inner oil deflector 18. The collecting pan 24 extends in the axial direction between the outer ring 20 and an outer wall 25 of the bearing arrangement 17 radially delimiting the oil sump 21.

[0055] Between the collecting pan 24 and the oil sump 21 a plurality of spaced-apart connecting openings 26 in the form of channels extending axially inwardly in the direction of the motor shaft 23 and sloping slightly in the direction of the axis 4 are provided, through which the oil collected in the collecting pan 26 can flow back into the oil sump 21, as indicated by arrows 23. From there, the oil can again be conveyed through the bearing 18 as previously described.

[0056] In addition to the inner oil deflector 22, a further oil deflector is provided in the form of an outer oil deflector 27, which is connected non-rotatably with the outer ring 20 or arranged with the outer wall 25 such that it extends radially away from the latter in the direction of the axis 4. With respect to the oil sump 21, the outer oil deflector 27 is arranged axially above the inner oil deflector 22. Like the inner oil deflector 22, the outer oil deflector 27 is configured disc-shaped and extends circumferentially around the motor shaft 6, but has no curvature. The outer oil deflector 27 serves to deflect oil not deflected by the inner oil deflector 22 into the oil sump 21.

[0057] Finally, a plurality of axially extending cooling fins 27 are formed circumferentially around the bearing arrangement 17 at the outer wall 25 thereof, through which the oil, in particular the oil flowing back into the oil sump 21, is cooled. For this purpose, the outer wall 26 or the bearing arrangement 17 is made of metal, wherein the cooling fins 27 can be formed of aluminum.

[0058] The described exemplary embodiments are merely examples, which may be modified and/or supplemented in a variety of ways within the scope of the claims. Any feature described for a particular exemplary embodiment may be used independently or in combination with other features in any other exemplary embodiment. Any feature that has been described for an exemplary embodiment of a particular category can also be used in a corresponding manner in an exemplary embodiment of another category.

LIST OF REFERENCE SYMBOLS

[0059] 1 Vertical turbine pump [0060] 2 Manifold housing [0061] 3 Manifold [0062] 4 Axis [0063] 5 Riser pipe [0064] 6 Motor shaft [0065] 7 Lower riser pipe end [0066] 8 Impeller [0067] 9 Upper riser pipe end [0068] 10 Base plate [0069] 11 Drive lantern [0070] 12 Motor [0071] 13 Coupling [0072] 14 First manifold end [0073] 15 Second manifold end [0074] 16 Outlet [0075] 17 Bearing arrangement [0076] 18 Bearing [0077] 19 Inner ring [0078] 20 Outer ring [0079] 21 Oil sump [0080] 22 Inner oil deflector [0081] 23 Arrows [0082] 24 Collecting pan [0083] 25 Outer wall [0084] 26 Connecting opening [0085] 27 Outer oil deflector [0086] 28 Cooling fins