Method for determining a flow volume of a fluid delivered by a pump

1. A method for determining a flow volume of a fluid delivered by a positive-displacement pump, wherein the flow volume is determined as a function of predefined pump information, which is dependent on a pump geometry, a rotation speed information, which correlates with the rotation speed of the pump, and pressure information, which correlates with a differential pressure at the pump, wherein, as additional information, an operating current and/or a shaft torque of the pump are registered, wherein the flow volume is determined by the function which further comprises the additional information, wherein the flow volume is calculated by subtracting a leakage volume flow, which is determined as a function of the pressure information and a function of the additional information, from a theoretical delivery volume flow, which is determined as a function of a pump volume predefined by the predefined pump information and the rotation speed information.

2. The method according to claim 1 , wherein, as further additional information, a temperature and/or a density of the fluid are registered, wherein the flow volume is determined by the function which further comprises the further additional information.

3. The method according to claim 1 , wherein at least one pressure sensor, and/or at least one force sensor which registers a force acting on a pump component are used to determine the pressure information.

4. The method according to claim 3 , wherein the pressure information is determined by at least one force sensor which measures the force on the pump component which is a bearing.

5. The method according to claim 1 , wherein, by a vibration sensor, a vibration of at least one component of the pump is registered, wherein the rotation speed information is determined in dependence on sensor data of the vibration sensor.

6. The method according to claim 1 , wherein the pump information describes a pump volume which indicates a theoretical delivery volume per revolution of the pump.

7. The method according to claim 1 , wherein, for the determination of the flow volume, the pump geometry is described by a maximum of four parameters.

8. The method according to claim 7 , wherein at least one of the parameters describing the pump geometry is defined by evaluating measurement data of at least two calibrating measurements which are performed on the pump at mutually different differential pressures.

9. The method according to claim 1 , wherein, as a function of the rotation speed information and/or the pressure information and/or the additional information and/or the flow volume, wear information, which indicates whether wear on the pump reaches or exceeds a predefined limit value and/or which indicates a severity of the wear and/or which describes a change in the pump geometry which the predefined r in the pump information depended on due to the wear, is determined.

10. The method according to claim 9 , wherein, as a function of the temporal progression of the rotation speed information and/or the pressure information and/or the additional information and/or the flow volume, wear information, which indicates whether wear on the pump reaches or exceeds a predefined limit value and/or which indicates a severity of the wear and/or which describes a change in the pump geometry which the predefined pump information depended on due to the wear, is determined.

11. A pump for delivering the fluid, wherein it is designed to implement the method according to claim 1 , wherein it comprises at least one sensor device, which is designed to register the rotation speed information and/or the pressure information and/or the additional information, and a processing device, which is designed to determine the flow volume in dependence on at least the predefined pump information, the rotation speed information and the pressure information.

12. The method according to claim 1 , wherein, as further additional information, a temperature and/or a density of the fluid are registered, wherein the leakage volume is determined by the function which further comprises the further additional information.

13. The method according to claim 1 , wherein, for the determination of the flow volume, the pump geometry is described by a maximum of four parameters.

14. The method according to claim 1 , wherein, as a function of the leakage volume flow, wear information, which indicates whether wear on the pump reaches or exceeds a predefined limit value and/or which indicates a severity of the wear and/or which describes a change in the pump geometry which the predefined pump information depended on due to the wear, is determined.

15. The method according to claim 14 , wherein the wear information is determined as a function of the temporal progression of the leakage volume flow.