Pump as well as a recirculation device for a pump

Patent metadata

Field	Value
Publication number	US-9683575-B2
Application number	US-201313763554-A
Country	US
Kind code	B2
Filing date	Feb 8, 2013
Priority date	Feb 10, 2012
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Disclosed is a pump for conveying a pump having a pump rotor rotatably supported about an axis of rotation in a pump stator in the operating state and a rotor shaft is arranged in a shaft leadthrough such that a lubricating film of a lubricating fluid formed from the pump fluid can be formed in a ring gap between the rotor shaft and the shaft leadthrough; and wherein a separation device is provided at the rotor shaft by which a predefinable quantity of an ingredient can be separated from the pump fluid by means of a centrifugal force for providing the lubricating fluid at the ring gap in the operating state, wherein a recirculation device is provided so that a gas can be recirculated with the aid of the separation device.

First claim

The invention claimed is:

1. A pump for conveying a pump fluid in the form of a multiphase mixture, wherein the pump fluid provided at an input pressure at a low-pressure side of the pump 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 in the operating state and a rotor shaft is arranged in a shaft leadthrough such that a lubricating film of a lubricating fluid formed from the pump fluid can be formed in a ring gap between the rotor shaft and the shaft leadthrough; and wherein a separation device is provided at the rotor shaft by which a predefinable quantity of an ingredient can be separated from the pump fluid by means of a centrifugal force for providing the lubricating fluid at the ring gap in the operating state, wherein a recirculation device is provided which separates a gas from the pump fluid in the separation device and recirculates the separated gas to the high-pressure side of the pump with the aid of the separation device.

2. A pump in accordance with claim 1 , wherein the shaft leadthrough forms a shaft bearing and a stationary bushing includes a rotating shaft sleeve.

3. A pump in accordance with claim 1 , wherein the shaft leadthrough forms a constriction point.

4. A pump in accordance with claim 1 , wherein the ring gap can be formed between the stationary bushing and the rotating shaft sleeve.

5. A pump in accordance with claim 1 , wherein the recirculation device includes a feed line, a recirculation line and a means to increase pressure, in particular a conveying screw and/or a grooved line.

6. A pump in accordance with claim 5 , wherein the recirculation device is flow-connected to the high-pressure side of the pump by means of the feed line for supplying the pump fluid so that the pump fluid flows from the high-pressure side of the pump to the recirculation device in the operating state.

7. A pump in accordance with claim 5 , wherein the separation device includes a first separation opening for separating the gas and/or a second separation opening for separating an ingredient and/or a third separation opening for separating the lubricating fluid.

8. A pump in accordance with claim 7 , wherein the first separation opening for separating the gas is flow-connected to the recirculation device, specifically to the recirculation line.

9. A pump in accordance with claim 7 , wherein the separation device includes the second and third separation openings, and wherein the second separation opening is flow-connected to the low-pressure side of the pump by means of a separation line for leading off the ingredient and/or the ring gap is flow-connected to the third separation opening of the separation device by means of a lubricant opening such that lubricating fluid at least partly liberated from the ingredient can be supplied to the ring gap via the lubricant opening for lubricating the shaft leadthrough.

10. A pump in accordance with claim 5 , wherein the recirculation device is flow-connected to the high-pressure side of the pump and/or to a gas sink by means of the recirculation line for recirculating the gas.

11. A pump in accordance with claim 10 , wherein the recirculation line is designed such that a pressure in the recirculation line is higher than on the high-pressure side of the pump and/or of the gas sink by means of the means to increase pressure and the gas can be conveyed by the recirculation device to the high-pressure side of the pump and/or to the gas sink.

12. A pump in accordance with claim 1 , wherein the separation device co-rotates with the rotor shaft about the axis of rotation and includes a ring chamber, at which ring chamber a separation opening is provided, which is preferably aligned tangentially, for separating the ingredient.

13. A pump in accordance with claim 1 , wherein the recirculation device is formed as an integral component in the pump stator.

14. 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, in particular for feeding a further lubricating point of the pump.

15. A recirculation device for a pump in accordance with claim 1 .

Assignees

• Sulzer Pumpen A G
• Sulzer Management Ag

Inventors

• Trottmann Benedikt

Classifications

• F04D29/061

  especially adapted for liquid pumps · CPC title

• F04D29/06 Primary

  Lubrication {(F04D13/0606, F04D13/0646, F04D13/0653 take precedence)} · CPC title

• F04D13/062

  pressure compensation between motor- and pump- compartment · CPC title

• F04D13/0606

  Canned motor pumps · CPC title

• F04D7/04

  the fluids being viscous or non-homogenous · CPC title