Pump, separation device for a pump, and rotor shaft for a pump

Abstract

Disclosed is a pump having a pump rotor rotatably supported about an axis of rotation in a pump stator. In this respect, the pump rotor is designed and is arranged above a rotor shaft in a shaft bearing such that a lubricating film of a lubricating fluid formed from the pump fluid can be formed in a lubricating ring gap between the rotor shaft and the shaft bearing. In accordance with the invention, a separation device is provided at the rotor shaft by which a predefinable quantity of the ingredient can be separated from the pump fluid by means of a centrifugal force in the operating state for providing the lubricating fluid.

Claims

1. A pump for conveying a pump fluid including an ingredient, wherein the pump fluid provided at a low-pressure side of the pump at an inlet pressure in an operating state can be conveyed to a high-pressure side of the pump by means of a pump rotor rotatably supported about an axis of rotation in a pump stator and the pump rotor is designed and is arranged above a rotor shaft in a shaft bearing such that a lubricating film of a lubricating fluid formed from the pump fluid is formed in a lubricating ring gap between the rotor shaft and the shaft bearing, wherein a separation device is provided on and rotatable by the rotor shaft and is configured to separate a predefinable quantity of the ingredient from the pump fluid by means of a centrifugal force generated by the rotation of the separation device for providing the lubricating fluid-in the operating state, and wherein the separation device is connected to a separation line configured to transport the separated ingredient from the separation device to the low-pressure side of the pump.

2. A pump in accordance with claim 1, wherein the separation device is connected to the high-pressure side of the pump via a feed line for feeding the pump fluid including the ingredient.

3. A pump in accordance with claim 1, wherein the separation device co-rotates with the rotor shaft about the axis of rotation and includes an outer ring chamber with a substantially tangentially oriented separation opening provided for separating the ingredient.

4. A pump in accordance with claim 1, wherein the ingredient has a higher density than the lubricating fluid and/or the ingredient is a solid.

5. A pump in accordance with claim 1, wherein the lubricating ring gap is flow-connected to the separation device by means of a lubricant opening such that lubricating fluid at least partly liberated from the ingredient can be fed to the lubricating ring gap via the lubricant opening for lubricating the shaft bearing.

6. A pump in accordance with claim 1, wherein a lubricant line is provided such that a predefinable quantity of lubricating fluid can be led off from the separation device for feeding a further lubricating point of the pump.

7. A pump in accordance with claim 1, wherein the separation device is releasably connected to the rotor shaft; and/or the separation device is a separation disk screwable to the rotor shaft.

8. A pump in accordance with claim 1, wherein the separation device is an integral component of the rotor shaft; and/or the separation device is a separation disk integrally connected to the rotor shaft.

9. A pump in accordance with claim 1, wherein the separation line is formed as an integral component in the pump stator.

10. A separation device for a pump in accordance with claim 1.

11. A separation device in accordance with claim 10, wherein the separation device is a separation disk screwable to the rotor shaft of the pump.

12. A separation device in accordance with claim 10, wherein the separation device includes an outer ring chamber at which ring chamber a substantially tangentially oriented separation opening is provided for separating the ingredient.

13. A rotor shaft for a pump in accordance with claim 1, having a separation device.

14. A rotor shaft in accordance with claim 13, wherein the separation device is releasably connectable to the rotor shaft.

15. A separation device in accordance with claim 1, wherein the pump fluid is crude oil and the ingredient is sand.

Description

(1) The invention will be explained in more detail in the following with reference to the drawing. There are shown in a schematic representation:

(2) FIG. 1a an embodiment of a pump in accordance with the invention with a separation disk;

(3) FIG. 1b the separation disk of the pump in accordance with FIG. 1a in detail;

(4) FIG. 1c the shaft bearing of the pump in accordance with FIG. 1a in detail; and

(5) FIG. 2 another variant of a shaft bearing of a pump in accordance with the invention.

(6) A particularly preferred embodiment of a pump in accordance with the invention having a separation device in the form of a separation disk will be discussed in the following with reference to FIG. 1a, with FIG. 1b showing the separation disk and FIG. 1c showing the design of the shaft bearing of the pump in accordance with FIG. 1a somewhat more exactly in detail.

(7) The pump in accordance with the invention, which is designated as a whole by the reference numeral 1 in the following, serves very generally and in particular in the specific embodiment of FIG. 1a for conveying a pump fluid 2 including an ingredient 21. The ingredient 21 in the example of FIGS. 1a to 1c is substantially sand which is present in non-tolerable quantities as a contaminant in the pump fluid 2. The pump fluid 2 is crude oil here which is available at a low-pressure side LP of the pump 1 at an inlet pressure P1 and which is conveyed to a high-pressure side HP of the pump 1 by means of a pump rotor 4 rotatably supported in a pump stator 3 about an axis of rotation A in accordance with the arrow P in the operating state. The pump rotor 4 is in this respect designed and is arranged above a rotor shaft 5 in a shaft bearing 6 such that a lubricating film 20 from a lubricating fluid 200 formed from a pump fluid 2 can be formed in a lubricating ring gap 21 between the rotor shaft 5 and the shaft bearing 6. In accordance with the invention, a separation device 7 is provided at the rotor shaft 5 by which a predefinable quantity of the ingredient 21 can be separated from the pump fluid 2 by means of a centrifugal force in the operating state for providing the lubricating fluid 200.

(8) As shown schematically in FIG. 1a, the separation device 7, which is here designed as a separation disk screwed to the rotor shaft 5 of the pump 1 by screws 70, is connected to the high-pressure side HP of the pump 1 via a feed line 8 for feeding the pump fluid 2 including the ingredient 21, that is here the crude oil. The separation disk is in this respect covered by a cover D through which the pump fluid 2 is supplied to the separation disk.

(9) In accordance with FIG. 1a or FIG. 1b, which shows the separation disk of FIG. 1a again somewhat more exactly in detail, the separation disk co-rotating with the rotor shaft 5 about the axis of rotation A includes an outer ring chamber 71, with a substantially tangentially oriented separation opening 72 being provided for separating the ingredient 21. The separation opening 72 is connected via a separation line 9 to the low-pressure side LP of the pump 1 for leading off the solid 21, that is in the present example for leading off the sand deposited in the crude oil. In this respect, the sand has a higher density than the lubricating fluid 200 which, as will be explained further below, is finally used for lubricating the rotor shaft 5.

(10) So that the lubricating fluid 200 can be provided for lubricating the rotor shaft 5 in the shaft bearing 6, the lubricating ring gap 21 is flow-connected to the separation device 7 by means of a lubricant opening 22 such that the lubricating fluid 200 at least partly liberated from sand can be fed via the lubricant opening 22 to the lubricant ring gap 21 for lubricating the shaft bearing 6.

(11) A lubricant line 10 is furthermore additionally provided such that a predefinable quantity of lubricant fluid 200 can be led off by the separation disk, in particular for feeding a further lubricant point of the pump 1 which additional lubricant points are not explicitly shown for reasons of clarity. In this respect, it is even possible that the lubricating fluid 200 branched off via the lubricant line 10 is used for lubricating further plant parts which are disposed outside the pump 1 or which are not part of the pump 1.

(12) As shown somewhat more clearly schematically in FIG. 1c, the separation device 7, that is here the separation disk in accordance with FIG. 1a, is, as already briefly mentioned, releasably connected to the rotor shaft 5.

(13) In this respect, it is, however, naturally also possible in another embodiment that the separation device 7 is an integral component of the rotor shaft 5 and, as shown schematically, for example, with reference to FIG. 2, the separation device 7 is in particular a separation disk integrally connected to the rotor shaft 5. The embodiment in accordance with FIG. 2 thus only differs from the embodiment shown in FIG. 1c in that the separation disk is integrally connected to the rotor shaft 5 and, beyond this, no additional lubricant line 10 is provided because in the example of FIG. 2 the lubricant 200 is only required for lubricating the rotor shaft 5 and is not required at any further point.

(14) In all the embodiments shown here only by way of example in the Figures, the separation line 9 is formed as an integral component in the pump stator 3, but can also be guided as a separate additional separation line, for example outwardly at the housing of the pump.

(15) It is understood that all the above-described embodiments of the invention are only to be understood as examples or by way of example and that the invention in particular, but not only, includes all suitable combinations of the described embodiments.