DE102020112076A1 - Level maintenance - Google Patents

Abstract

The invention relates to a pump arrangement for conveying a fluid, comprising a pump housing with a pump chamber, an inlet opening and an outlet opening, a displacement arrangement which is arranged in the pump chamber and is movably supported relative to the pump chamber for a pump displacement movement which enables the fluid to be conveyed by the Inlet to the outlet opening causes a drive device which is mechanically coupled to the displacement arrangement for driving the displacement arrangement in the pump displacement movement, a flow path which extends between the inlet opening and the outlet opening and in which the fluid flows when the displacement arrangement through the drive device is driven. The invention also relates to a control device for a pump arrangement, a firmware update for firmware of a control device and a method for adjusting a fluid level of a fluid in a container.

Description

The invention relates to a pump arrangement for conveying a fluid, comprising a pump housing with a pump chamber, an inlet opening and an outlet opening, a displacement arrangement which is arranged in the pump chamber and is movably supported relative to the pump chamber for a pump displacement movement which enables the fluid to be conveyed by the Inlet to the outlet opening causes a drive device which is mechanically coupled to the displacement arrangement for driving the displacement arrangement in the pumping displacement movement, a flow path which extends between the inlet opening and the outlet opening and in which the fluid flows when the displacement arrangement through the drive device is driven. The invention also relates to a control device for a pump arrangement, a firmware update for a firmware of a control device and a method for adjusting a fluid level of a fluid in a container.

Basically, it is known to connect such pump arrangements by means of a line to a container (such as a fluid reservoir, a pit, a body of water) and by supplying fluid into the container and / or discharging fluid from the container, the fluid level in the container in one to maintain a predetermined range or at a predetermined value. In order to enable regulation of the fluid level in the container, it is necessary to determine the fluid level in the container. The fluid level in the container is usually continuously determined by means of a filling level sensor which is arranged in the container or by means of a plurality of filling level sensors which are arranged in the container. On the basis of the determined level, depending on the predetermined range or the predetermined value for the fluid level with the pump arrangement, fluid can be fed into the container or removed from the container, so that the fluid level in the container is in the predetermined range or is held at the predetermined value.

The installation of such a pump arrangement on a container and the associated device for regulating the fluid level in the container is associated with additional costs and requires a level measurement in the container. This is often not desired, since a sensor system for level measurement is prone to contamination and either a complex and vulnerable sensor system is necessary or often only a single level can be detected and consequently also adjusted. In many applications, however, a level control that is insensitive to contamination and suitable for a plurality of different water levels is desired.

The invention is therefore based on the object of providing an improved solution which addresses at least one of the problems mentioned. In particular, the object of the invention is to provide a solution which reduces the cost of installing a pump arrangement on a container and enables the regulation of the fluid level in the container to be set up with greater variability.

1. a) Empfangen eines ersten Drucksensorsignals, das einen Druck des Fluides in dem Strömungsweg, vorzugsweise in dem Pumpenraum, charakterisiert, von der Sensoranordnung, wobei das Empfangen des ersten Drucksensorsignals während des Antreibens der Verdrängungsanordnung erfolgt,
2. b) Ermitteln eines Drucks in dem Strömungsweg, aus dem ersten Drucksensorsignal,
3. c) Ermitteln einer Strömungsgeschwindigkeit an der Position des Drucksensors, wobei die Strömungsgeschwindigkeit die Geschwindigkeit des von der Einlassöffnung zur Auslassöffnung geförderten Fluides charakterisiert, aus einem zweiten Sensorsignal der Sensoranordnung und/oder aus einer Drehzahl der Antriebsvorrichtung und/oder aus einer Drehzahl der Verdrängungsanordnung,
4. d) Ermitteln eines Anlagendruckverlustes indem anhand der ermittelten Strömungsgeschwindigkeit und/oder des ermittelten Drucks ein Wert für den Anlagendruckverlust aus einer vorbestimmten Zuordnung des Anlagendruckverlustes zum Druck und/oder zur Strömungsgeschwindigkeit, die in der Steuerungseinrichtung abgespeichert ist, ausgelesen wird,
5. e) Ermitteln eines statischen Drucks an der Einlassöffnung oder an der Auslassöffnung, aus dem ermittelten Anlagendruckverlust und dem ermittelten Druck,
6. f) Ermitteln des Unterschiedes zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und einem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung,
7. g) Erzeugen und Ausgeben eines Steuerungssignals an die Antriebsvorrichtung in Abhängigkeit von dem Unterschied zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und dem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung, wobei das Steuerungssignal ausgebildet ist, um die Drehzahl der Antriebsvorrichtung anzusteuern und mit der dadurch bewirkten Förderung des Fluides durch die Verdrängungsanordnung den Unterschied zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und dem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung zu verringern,

wobei vorzugsweise eine Pegeljustierung umfassend die Steuerungsschritte a) bis f) oder a) bis g) mehrfach innerhalb eines vorbestimmten Zeitintervalls, besonders bevorzugt in regelmäßigen zeitlichen Abständen, ausgeführt wird.According to a first aspect, the above-mentioned object is achieved by a pump arrangement with the features of claim 1. The pump arrangement is characterized by a sensor arrangement which is arranged in the flow path and comprises a pressure sensor which is designed to detect pressure in the flow path of the fluid and for generating pressure sensor signals from the recorded pressures, a control device which is connected to the sensor arrangement for signal transmission and is designed to carry out control steps:

1. a) receiving a first pressure sensor signal, which characterizes a pressure of the fluid in the flow path, preferably in the pump chamber, from the sensor arrangement, the first pressure sensor signal being received while the displacement arrangement is being driven,
2. b) determining a pressure in the flow path from the first pressure sensor signal,
3. c) determining a flow speed at the position of the pressure sensor, the flow speed characterizing the speed of the fluid conveyed from the inlet opening to the outlet opening, from a second sensor signal from the sensor arrangement and / or from a speed of the drive device and / or from a speed of the displacement arrangement,
4. d) Determining a system pressure loss by reading a value for the system pressure loss from a predetermined assignment of the system pressure loss to the pressure and / or to the flow rate, which is stored in the control device, based on the determined flow rate and / or the determined pressure,
5. e) Determining a static pressure at the inlet opening or at the outlet opening from the system pressure loss determined and the pressure determined,
6. f) Determining the difference between the determined static pressure at the inlet opening or at the outlet opening and a predetermined target pressure at the inlet opening or at the outlet opening,
7. g) Generating and outputting a control signal to the drive device as a function of the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening, the control signal being designed to increase the speed to control the drive device and to reduce the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening with the resulting conveyance of the fluid through the displacement arrangement,

wherein a level adjustment comprising the control steps a) to f) or a) to g) is preferably carried out several times within a predetermined time interval, particularly preferably at regular time intervals.

With the pump arrangement according to the invention it is possible to keep a level in a container connected to the pump constant at a predetermined target level. This can be done both for a container that is connected to the inlet opening on the suction side and into which liquid is supplied from a source and for a container that is connected to the outlet opening on the pressure side and from which the liquid flows to a consumer.

The pump arrangement is preferably designed as a positive displacement pump, in particular in the form of a rotary lobe pump or an eccentric screw pump. In principle, however, other pump designs are also possible, such as centrifugal pumps. The fluid to be delivered can get into the pump chamber through the inlet opening and out of the pump chamber through the outlet opening. It is preferred if the inlet opening and the outlet opening can be exchanged in their function by reversing the conveying direction, so that the previous inlet opening becomes the outlet opening and the previous outlet opening becomes the inlet opening. A displacement arrangement is to be understood as an arrangement which, through a movement of the displacement arrangement, can bring about the conveyance of the fluid in the pump chamber from the inlet opening to the outlet opening. The displacement arrangement can, for example, comprise or consist of two rotary lobes of a rotary lobe pump which are arranged in the pump chamber and are each rotatably mounted about an axis of rotation. The displacement arrangement can, however, also comprise or consist of, for example, a rotor of an eccentric screw pump or an impeller of a centrifugal pump. It is particularly preferred if the displacement arrangement can execute a rotational movement. The drive device is designed to drive the displacement arrangement. It is particularly preferred if the drive device can set the displacement arrangement in a rotational movement. The flow path is in particular the path that the fluid, when it is conveyed by the pump arrangement, travels from the inlet opening to the outlet opening. The inlet and / or outlet opening is preferably designed as an opening in the pump housing, that is to say a component of the pump housing. In this case, the sensor device can also comprise a pressure sensor which is arranged in the flow path and is arranged directly on the pump housing.

The inlet and / or outlet opening can, however, also be arranged at a distance from the pump housing, for example in that an inlet line or outlet line is connected to a corresponding opening on the pump housing and the flow path runs through this inlet and / or outlet line. In this case, the sensor device can also comprise a pressure sensor which is arranged in the flow path and is arranged further at a distance from the pump housing.

The sensor arrangement preferably comprises a plurality of sensors. The control device is preferably connected to the sensor arrangement in terms of signaling.

With a known flow cross-section, a volume flow can preferably be determined by means of the flow velocity and this can be taken into account when controlling the speed. Furthermore, the flow speed can preferably be determined even with a known speed from a theoretically known ratio of speed to volume flow and a further known flow passage cross section in the area of the pressure sensor, whereby in particular a measurement of the flow speed itself is not absolutely necessary. For positive displacement pumps such as rotary lobe pumps and eccentric screw pumps, the volume flow can be calculated based on the chamber volume and the speed of the rotary lobes or the rotor, usually neglecting losses due to minor leakages.

The predetermined assignment of the system pressure loss to the pressure and / or to the flow rate can in particular be a system pressure loss characteristic or be in the form of a system pressure loss characteristic. It includes Effects on the pressure measurement that occur due to pressure losses in the lines upstream and downstream of the pressure measuring point and due to the flow rate of the fluid at the pressure measuring point. The pump arrangement is preferably connected to a container via a line. It is preferred if a fluid level in the container, which is connected to the pump arrangement via a line, can be determined by means of the determined static pressure at the inlet opening or at the outlet opening. The static pressure is to be understood at least approximately as a pressure which, due to the fluid level present in the container, would be present in a static state if the displacement arrangement was stopped. However, the static pressure is not determined with the aid of pressure measurements in the static state, but with the aid of the pressure determined when the displacement arrangement is driven, which is different from the pressure determined in the static state (with the displacement arrangement stopped) due to the flow of the fluid and system pressure losses as a result of the flow. The determined static pressure is dependent on and at least approximately proportional to the fluid level in the container and thus dependent on and at least approximately proportional to the geodetic pressure.

The target pressure is preferably a value at which a target fluid level of the fluid level in a container which is connected to the pump arrangement via a line is reached. The determined static pressure is preferably proportional to the fluid level in the container. The target pressure is preferably proportional to a target fluid level of the fluid level in the container. The determination of the difference between the determined static pressure at the inlet opening or at the outlet opening and a predetermined target pressure at the inlet opening or at the outlet opening can therefore also take place by determining the difference between a determined fluid level in the container and a predetermined target fluid level in the container.

A first advantage of such a pump arrangement is that a fluid level in a container, which is connected to the pump arrangement via a line, can be regulated without the need for a fill level sensor arranged in the container. As a result, the costs for such fill level sensors and for the installation of such fill level sensors can be saved.

Another advantage is that, in an advantageous manner, regular cleaning and checking of fill level sensors in the container, which is normally necessary, can also be dispensed with.

Overall, the material and personnel costs that arise for the procurement and use of such a pump arrangement can thus be reduced. In addition, the installation of such a pump arrangement, which enables a control of the fluid level in a container, takes place within a shorter time because of the unnecessary filling level sensors in the container.

It is particularly preferred if the control device is designed to carry out the control step: Provision of standard data, which contain values related to the pump arrangement, for determining the system pressure loss by means of the standard data.

The standard data can include, for example, a chamber volume and a ratio between pump speed and delivery volume. A conveyed volume per unit of time is understood here as a conveyed volume. Flow velocities in the flow path of the pump arrangement, calculated directly on the basis of the outlet or inlet cross section of the outlet opening or inlet opening, can also be stored as standard data as a function of a speed of the pump.

The standard data can be in the form of a table, the table containing pump-specific values for the flow velocity or the system pressure loss at different pressures and / or flow velocities. The standard data are preferably in the form of predetermined control values of the pump arrangement that are stored within the control device. It is particularly advantageous if values for the system pressure loss can be determined with the standard data and therefore a calibration in an installed state is not absolutely necessary. It is particularly preferred if, when determining a value for the system pressure loss, the viscosity and / or the density of the fluid to be conveyed are taken into account and / or if the values for the system pressure loss contained in the standard data depend on the viscosity and / or the density of the fluid to be pumped conveying fluids are dependent.

Furthermore, it is preferred if the control device is designed to carry out the control step: Carrying out a calibration in an installed state in which the pump arrangement is fluidically connected to a container, in order to determine installation-specific values for the system pressure loss.

Carrying out such a calibration offers the advantage that when determining the values for the system pressure loss, the influencing variables of the installation condition are taken into account. This enables precise values for the system pressure loss to be determined. In the installed state, the The pump arrangement is preferably connected to the container by means of a line.

1. a) Ausgeben eines Steuerungssignals, das ausgebildet ist, um die Drehzahl der Antriebsvorrichtung anzusteuern und eine erste Drehzahl anzufahren,
2. b) Ermitteln eines ersten Drucks in dem Strömungsweg aus einem ersten Drucksensorsignal des Drucksensors während der ersten Drehzahl,
3. c) Ausgeben eines Steuerungssignals, das ausgebildet ist, um die Drehzahl der Antriebsvorrichtung anzusteuern und eine zweite, von der ersten verschiedene Drehzahl anzufahren,
4. d) Ermitteln eines zweiten Drucks in dem Strömungsweg aus einem zweiten Drucksensorsignal des Drucksensors während der zweiten Drehzahl,
5. e) Ermitteln der Druckdifferenz zwischen dem in Kalibrierungsschritt b) ermittelten ersten Druck und dem in Kalibrierungsschritt d) ermittelten zweiten Druck und Abspeichern der Druckdifferenz als Anlagendruckverlust für einen Betriebszustand der Pumpenanordnung bei der ersten Drehzahl und dem ersten Druck.

In a particularly preferred embodiment, the pump arrangement is characterized in that the control device is designed to carry out the following calibration steps to determine the predetermined stored assignment of the system pressure loss to the pressure and / or to the flow rate:

1. a) outputting a control signal which is designed to control the speed of the drive device and to approach a first speed,
2. b) determining a first pressure in the flow path from a first pressure sensor signal of the pressure sensor during the first rotational speed,
3. c) outputting a control signal which is designed to control the speed of the drive device and to approach a second speed different from the first,
4. d) determining a second pressure in the flow path from a second pressure sensor signal of the pressure sensor during the second rotational speed,
5. e) Determining the pressure difference between the first pressure determined in calibration step b) and the second pressure determined in calibration step d) and storing the pressure difference as a system pressure loss for an operating state of the pump arrangement at the first speed and the first pressure.

The first rotational speed can preferably have the value 0, with the drive device not being driven, or a value which is greater than 0, with the drive device being driven. If the first speed has the value 0, a minimum calibration can be carried out using only one started speed, whereby values for the system pressure loss - for example at different pressures and / or flow speeds of the fluid - can be determined preferably by means of extrapolation.

It is particularly preferred if the control device is designed to carry out the following calibration step in order to determine the predetermined assignment of the system pressure loss to the pressure and / or to the flow rate: waiting for a waiting time until the pressure sensor signal from the sensor arrangement has settled, in particular by waiting for a predetermined period of time or by determining a standard deviation of several pressure sensor signals detected within a time interval, and receiving the first pressure sensor signal after the waiting time, in particular after the predetermined time span has elapsed or after the determined standard deviation has fallen below a predetermined value, this calibration step preferably between calibration steps a) and b) and / or takes place between calibration steps c) and d).

One advantage of waiting for such a waiting time is that the pressure can be precisely determined after the pressure signal has settled. This waiting time can take place after the first speed setting as well as after the second speed setting and, if further measurements follow, also after the respective previous speed settings. The waiting time can be maintained as a predetermined waiting time or it can be determined as a function of the speed difference between the previous and the newly set speed, since the duration of the decay depends on this speed difference. On the one hand, you can wait for the waiting time after setting the new speed and then carry out the pressure measurement. It is also possible to carry out several measurements during the waiting time in order to then calculate an average value after the waiting time has elapsed. In this case, it is not necessary to wait for the transient to fully subside, and the waiting time can be shorter.

According to a further preferred embodiment, the pump arrangement is developed in such a way that the second speed is equal to zero and the drive device is stopped in step c.

It is particularly preferred if, after step e), the calibration steps a) to e) are repeated at least once, preferably several times, a different first speed being set for each repetition in step a) and calibration values from the several determined pressure differences at the different speeds can be determined.

In these embodiments, calibration is always carried out by measuring a pressure value once or several times during a pumping process against a measurement at standstill. When the measurement is repeated several times, a different speed and consequently a different delivery volume is always introduced.

It is further preferred if the second speed is different from zero and after the completion of a first calibration process in step e) at least one, preferably several subsequent calibration processes comprising the calibration steps c) to e) are carried out, with each repeated calibration process in Step c) a second speed different from the second speed in the previous calibration process is set and in step e) the pressure difference between the second pressure determined in step d) of the previous calibration process and the pressure determined in step d) of the current calibration process is determined and calibration values can be determined from the several determined pressure differences at the different speeds.

In this variant, the calibration is carried out by comparing two pressure measurements with different delivery volumes of the pump. In particular, if the measurement is carried out several times, the second measured value of a previous measurement can be used as the first measured value of a subsequent measurement. Calibration values for several delivery volumes or speeds of the pump can thus be determined quickly.

Basically, it should be understood that the control device according to the invention can be designed to carry out a calibration according to the first-mentioned procedure - i.e. a comparison of a pressure measurement during delivery and a pressure measurement during standstill - or the last-mentioned procedure - i.e. a comparison of two pressure measurements at different delivery volumes to be carried out, or the control device can be designed to carry out a calibration optionally in one of the two procedures.

• - wobei bei jeder Ausführung der Kalibrierungsschritte unterschiedliche Drehzahlen angefahren werden
• - und die hieraus ermittelten mehreren Anlagendruckverluste abgespeichert werden.

It is also preferred if the calibration steps are carried out more than once, particularly preferably five times, one after the other,

• - Different speeds are approached each time the calibration steps are carried out
• - and the several system pressure losses determined from this are saved.

It is particularly preferred here if a value for the system pressure loss takes place by means of averaging determined values.

It is even further preferred if the control device is designed to carry out the following calibration step: forming a characteristic curve and reading out a pressure loss value lying between two measuring points by averaging between these two measuring points.

It is particularly preferred if a characteristic curve for the system pressure loss is formed from the determined multiple system pressure losses. Such a characteristic can already be formed by means of two system pressure losses that have been determined. A system pressure loss that lies between two existing determined values for the system pressure loss can preferably take place by reading out a value of the characteristic curve between the two existing determined values.

Furthermore, it is preferred if the control device is designed to carry out the following calibration steps: Forming a characteristic curve and reading out the pressure loss value lying beyond the area covered by the measuring points by extrapolation from at least two measuring points.

It is particularly preferred if a value for the system pressure loss is obtained by extrapolation from at least two determined values for the system pressure loss.

Furthermore, it is preferred if the control device is designed to carry out the following calibration step: Forming a characteristic curve and reading out a pressure loss value lying between two measuring points by interpolation between these two measuring points.

It is also preferred if the control device is designed to carry out the following control step when the speed falls below a predetermined minimum speed: switching off the drive device.

1. a) Empfangen eines ersten Drucksensorsignals, das einen Druck des Fluides in dem Strömungsweg, vorzugsweise in einem Pumpenraum, charakterisiert, von der Sensoranordnung, wobei das Empfangen des ersten Drucksensorsignals während des Betriebes der Pumpenanordnung, insbesondere während des Antreibens einer Verdrängungsanordnung in einem Pumpenraum der Pumpenanordnung, erfolgt,
2. b) Ermitteln eines Drucks in dem Strömungsweg, aus dem ersten Drucksensorsignal,
3. c) Ermitteln einer Strömungsgeschwindigkeit an der Position des Drucksensors, wobei die Strömungsgeschwindigkeit die Geschwindigkeit des von der Einlassöffnung zur Auslassöffnung geförderten Fluides charakterisiert, aus einem zweiten Sensorsignal der Sensoranordnung und/oder aus einer Drehzahl einer Antriebsvorrichtung und/oder aus einer Drehzahl einer Verdrängungsanordnung,
4. d) Ermitteln eines Anlagendruckverlustes indem anhand der ermittelten Strömungsgeschwindigkeit und/oder des ermittelten Drucks ein Wert für den Anlagendruckverlust aus einer in der Steuerungseinrichtung abgespeicherten Zuordnung des Anlagendruckverlustes zum Druck und/oder zur Strömungsgeschwindigkeit ausgelesen wird,
5. e) Ermitteln eines statischen Drucks an einer Einlassöffnung oder an einer Auslassöffnung, aus dem ermittelten Anlagendruckverlust und dem ermittelten Druck,
6. f) Ermitteln des Unterschiedes zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und einem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung,
7. g) Erzeugen und Ausgeben eines Steuerungssignals an die Antriebsvorrichtung in Abhängigkeit von dem Unterschied zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und dem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung, wobei das Steuerungssignal ausgebildet ist, um die Drehzahl einer Antriebsvorrichtung anzusteuern und mit der dadurch bewirkten Förderung des Fluides durch eine Verdrängungsanordnung den Unterschied zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und dem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung zu verringern,

wobei vorzugsweise eine Pegeljustierung umfassend die Steuerungsschritte a) bis f) oder a) bis g) mehrfach innerhalb eines vorbestimmten Zeitintervalls, besonders bevorzugt in regelmäßigen zeitlichen Abständen, ausgeführt wird. Die Steuerungsvorrichtung eignet sich zur Nachrüstung an bestehenden Pumpen und kann gegebenenfalls fortgebildet werden wie dies zuvor für die Steuerungsvorrichtung der erfindungsgemäßen Pumpeinrichtung.According to a second aspect, the above-mentioned object is achieved by a control device for a pump arrangement for conveying a fluid, with a sensor arrangement which is arranged in a flow path and comprises a pressure sensor which is designed to detect pressure in the flow path of the fluid and to generate pressure sensor signals from the detected pressures, is connected to the signal transmission and is designed to carry out the following control steps:

1. a) Receiving a first pressure sensor signal which characterizes a pressure of the fluid in the flow path, preferably in a pump chamber, from the sensor arrangement, the receiving of the first pressure sensor signal during operation of the pump arrangement, in particular while driving a displacement arrangement in a pump chamber of the pump arrangement , he follows,
2. b) determining a pressure in the flow path from the first pressure sensor signal,
3. c) determining a flow velocity at the position of the pressure sensor, the flow velocity being the velocity of the from the inlet opening to Characterized outlet opening of the pumped fluid, from a second sensor signal of the sensor arrangement and / or from a speed of a drive device and / or from a speed of a displacement arrangement,
4. d) determining a system pressure loss by using the determined flow velocity and / or the determined pressure to read a value for the system pressure loss from an assignment of the system pressure loss to the pressure and / or to the flow velocity stored in the control device,
5. e) Determining a static pressure at an inlet opening or at an outlet opening from the system pressure loss determined and the pressure determined,
6. f) determining the difference between the determined static pressure at the inlet opening or at the outlet opening and a predetermined target pressure at the inlet opening or at the outlet opening,
7. g) Generating and outputting a control signal to the drive device as a function of the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening, the control signal being designed to increase the speed to control a drive device and to reduce the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening with the resulting conveyance of the fluid through a displacement arrangement,

preferably a level adjustment comprising the control steps a) to f) or a) to g) several times within a predetermined time interval, is particularly preferably carried out at regular time intervals. The control device is suitable for retrofitting on existing pumps and, if necessary, can be further developed, as was previously the case for the control device of the pumping device according to the invention.

1. a) Empfangen eines ersten Drucksensorsignals, das einen Druck des Fluides in dem Strömungsweg, vorzugsweise in einem Pumpenraum, charakterisiert, von der Sensoranordnung, wobei das Empfangen des ersten Drucksensorsignals während des Betriebes der Pumpenanordnung, insbesondere während des Antreibens einer Verdrängungsanordnung in einem Pumpenraum der Pumpenanordnung, erfolgt,
2. b) Ermitteln eines Drucks in dem Strömungsweg, aus dem ersten Drucksensorsignal,
3. c) Ermitteln einer Strömungsgeschwindigkeit an der Position des Drucksensors, wobei die Strömungsgeschwindigkeit die Geschwindigkeit des von der Einlassöffnung zur Auslassöffnung geförderten Fluides charakterisiert, aus einem zweiten Sensorsignal der Sensoranordnung und/oder aus einer Drehzahl einer Antriebsvorrichtung und/oder aus einer Drehzahl einer Verdrängungsanordnung,
4. d) Ermitteln eines Anlagendruckverlustes indem anhand der ermittelten Strömungsgeschwindigkeit und/oder des ermittelten Drucks ein Wert für den Anlagendruckverlust aus einer in der Steuerungseinrichtung abgespeicherten Zuordnung des Anlagendruckverlustes zum Druck und/oder zur Strömungsgeschwindigkeit ausgelesen wird,
5. e) Ermitteln eines statischen Drucks an einer Einlassöffnung oder an einer Auslassöffnung, aus dem ermittelten Anlagendruckverlust und dem ermittelten Druck,
6. f) Ermitteln des Unterschiedes zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und einem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung,
7. g) Erzeugen und Ausgeben eines Steuerungssignals an die Antriebsvorrichtung in Abhängigkeit von dem Unterschied zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und dem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung, wobei das Steuerungssignal ausgebildet ist, um die Drehzahl einer Antriebsvorrichtung anzusteuern und mit der dadurch bewirkten Förderung des Fluides durch eine Verdrängungsanordnung den Unterschied zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und dem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung zu verringern,

wobei vorzugsweise eine Pegeljustierung umfassend die Steuerungsschritte a) bis f) oder a) bis g) mehrfach innerhalb eines vorbestimmten Zeitintervalls, besonders bevorzugt in regelmäßigen zeitlichen Abständen, ausgeführt wird. Dieses Firmware-Update besteht in einer entsprechenden Software, die eine Steuerungsvorrichtung so programmiert, dass diese die genannten Schritte ausführen kann. Dabei kann die Firmware so weitergebildet werden, dass sie die zuvor für die erfindungsgemäße Steuerungsvorrichtung beschriebenen Schritte programmiert.According to a third aspect, the aforementioned object is achieved by a firmware update for firmware of a control device and / or for firmware of a control device of a pump arrangement, the firmware update comprising information for the control device for performing the following control steps:

1. a) Receiving a first pressure sensor signal which characterizes a pressure of the fluid in the flow path, preferably in a pump chamber, from the sensor arrangement, the receiving of the first pressure sensor signal during operation of the pump arrangement, in particular while driving a displacement arrangement in a pump chamber of the pump arrangement , he follows,
2. b) determining a pressure in the flow path from the first pressure sensor signal,
3. c) determining a flow speed at the position of the pressure sensor, the flow speed characterizing the speed of the fluid conveyed from the inlet opening to the outlet opening, from a second sensor signal from the sensor arrangement and / or from a speed of a drive device and / or from a speed of a displacement arrangement,
4. d) determining a system pressure loss by using the determined flow velocity and / or the determined pressure to read a value for the system pressure loss from an assignment of the system pressure loss to the pressure and / or to the flow velocity stored in the control device,
5. e) Determining a static pressure at an inlet opening or at an outlet opening from the system pressure loss determined and the pressure determined,
6. f) determining the difference between the determined static pressure at the inlet opening or at the outlet opening and a predetermined target pressure at the inlet opening or at the outlet opening,
7. g) Generating and outputting a control signal to the drive device as a function of the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening, the control signal being designed to increase the speed to control a drive device and to reduce the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening with the resulting conveyance of the fluid through a displacement arrangement,

wherein a level adjustment comprising the control steps a) to f) or a) to g) is preferably carried out several times within a predetermined time interval, particularly preferably at regular time intervals. This firmware update consists of corresponding software that programs a control device in such a way that it can carry out the steps mentioned. The firmware can be developed in such a way that it programs the steps described above for the control device according to the invention.

1. a) Empfangen eines ersten Drucksensorsignals, das einen Druck des Fluides in dem Strömungsweg, vorzugsweise in einem Pumpenraum, charakterisiert, von der Sensoranordnung, wobei das Empfangen des ersten Drucksensorsignals während des Betriebes der Pumpenanordnung, insbesondere während des Antreibens einer Verdrängungsanordnung in einem Pumpenraum der Pumpenanordnung, erfolgt,
2. b) Ermitteln eines Drucks in dem Strömungsweg, aus dem ersten Drucksensorsignal,
3. c) Ermitteln einer Strömungsgeschwindigkeit an der Position des Drucksensors, wobei die Strömungsgeschwindigkeit die Geschwindigkeit des von der Einlassöffnung zur Auslassöffnung geförderten Fluides charakterisiert, aus einem zweiten Sensorsignal der Sensoranordnung und/oder aus einer Drehzahl einer Antriebsvorrichtung und/oder aus einer Drehzahl einer Verdrängungsanordnung,
4. d) Ermitteln eines Anlagendruckverlustes indem anhand der ermittelten Strömungsgeschwindigkeit und/oder des ermittelten Drucks ein Wert für den Anlagendruckverlust aus einer in einer Steuerungseinrichtung abgespeicherten Zuordnung des Anlagendruckverlustes zum Druck und/oder zur Strömungsgeschwindigkeit ausgelesen wird,
5. e) Ermitteln eines statischen Drucks an einer Einlassöffnung oder an einer Auslassöffnung, aus dem ermittelten Anlagendruckverlust und dem ermittelten Druck, wobei die Einlassöffnung oder die Auslassöffnung mit dem Behälter in Fluidverbindung steht,
6. f) Ermitteln des Unterschiedes zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und einem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung,
7. g) Erzeugen und Ausgeben eines Steuerungssignals an die Antriebsvorrichtung in Abhängigkeit von dem Unterschied zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und dem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung, wobei das Steuerungssignal ausgebildet ist, um die Drehzahl einer Antriebsvorrichtung anzusteuern und mit der dadurch bewirkten Förderung des Fluides durch eine Verdrängungsanordnung den Unterschied zwischen dem ermittelten statischen Druck an der Einlassöffnung oder an der Auslassöffnung und dem vorbestimmten Soll-Druck an der Einlassöffnung oder an der Auslassöffnung zu verringern,

wobei vorzugsweise eine Pegeljustierung umfassend die Steuerungsschritte a) bis f) oder a) bis g) mehrfach innerhalb eines vorbestimmten Zeitintervalls, besonders bevorzugt in regelmäßigen zeitlichen Abständen, ausgeführt wird.According to a fourth aspect, the above-mentioned object is achieved by a method for adjusting a fluid level of a fluid in a container by means of a pump arrangement, with a sensor arrangement which is arranged in a flow path and comprises a pressure sensor which is designed to detect pressure in the flow path of the fluid and for generating pressure sensor signals from the recorded pressures, for signal transmission in connection, with the steps:

1. a) Receiving a first pressure sensor signal which characterizes a pressure of the fluid in the flow path, preferably in a pump chamber, from the sensor arrangement, the receiving of the first pressure sensor signal during operation of the pump arrangement, in particular while driving a displacement arrangement in a pump chamber of the pump arrangement , he follows,
2. b) determining a pressure in the flow path from the first pressure sensor signal,
3. c) determining a flow speed at the position of the pressure sensor, the flow speed characterizing the speed of the fluid conveyed from the inlet opening to the outlet opening, from a second sensor signal from the sensor arrangement and / or from a speed of a drive device and / or from a speed of a displacement arrangement,
4. d) Determining a system pressure loss by reading a value for the system pressure loss from an assignment of the system pressure loss to the pressure and / or to the flow rate stored in a control device on the basis of the determined flow velocity and / or the determined pressure,
5. e) determining a static pressure at an inlet opening or at an outlet opening from the determined system pressure loss and the determined pressure, the inlet opening or the outlet opening being in fluid connection with the container,
6. f) determining the difference between the determined static pressure at the inlet opening or at the outlet opening and a predetermined target pressure at the inlet opening or at the outlet opening,
7. g) Generating and outputting a control signal to the drive device as a function of the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening, the control signal being designed to increase the speed to control a drive device and to reduce the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening with the resulting conveyance of the fluid through a displacement arrangement,

wherein a level adjustment comprising the control steps a) to f) or a) to g) is preferably carried out several times within a predetermined time interval, particularly preferably at regular time intervals.

1. a) Ausgeben eines Steuerungssignals, das ausgebildet ist, um die Drehzahl der Antriebsvorrichtung anzusteuern und eine erste Drehzahl anzufahren,
2. b) Ermitteln eines ersten Drucks in dem Strömungsweg aus einem ersten Drucksensorsignal des Drucksensors während der ersten Drehzahl,
3. c) Ausgeben eines Steuerungssignals, das ausgebildet ist, um die Drehzahl der Antriebsvorrichtung anzusteuern und eine zweite, von der ersten verschiedene Drehzahl anzufahren,
4. d) Ermitteln eines zweiten Drucks in dem Strömungsweg aus einem zweiten Drucksensorsignal des Drucksensors während der zweiten Drehzahl,
5. e) Ermitteln der Druckdifferenz zwischen dem in Kalibrierungsschritt b) ermittelten ersten Druck und dem in Kalibrierungsschritt d) ermittelten zweiten Druck und Abspeichern der Druckdifferenz als Anlagendruckverlust für einen Betriebszustand der Pumpenanordnung bei der ersten Drehzahl und dem ersten Druck.

It is particularly preferred if, in the method, the control device is designed to carry out the following calibration steps to determine the predetermined assignment of the system pressure loss to the pressure and / or to the flow rate:

1. a) outputting a control signal which is designed to control the speed of the drive device and to approach a first speed,
2. b) determining a first pressure in the flow path from a first pressure sensor signal of the pressure sensor during the first rotational speed,
3. c) outputting a control signal which is designed to control the speed of the drive device and to approach a second speed different from the first,
4. d) determining a second pressure in the flow path from a second pressure sensor signal of the pressure sensor during the second rotational speed,
5. e) Determining the pressure difference between the first pressure determined in calibration step b) and the second pressure determined in calibration step d) and storing the pressure difference as a system pressure loss for an operating state of the pump arrangement at the first speed and the first pressure.

It is particularly preferred if, in order to determine the predetermined assignment of the system pressure loss to the pressure and / or to the Flow rate, the following calibration step is carried out: waiting for a first waiting time until the pressure sensor signal from the sensor arrangement has settled, in particular by waiting for a predetermined first time period or by determining a standard deviation of several pressure sensor signals detected within a time interval, and receiving the first pressure sensor signal after the first waiting time, in particular after the predetermined first time span has elapsed or after the determined standard deviation has fallen below a predetermined value, this calibration step preferably taking place between calibration steps a) and b) and / or between calibration steps c) and d).

It is particularly preferred if in the method the second speed is equal to zero and the drive device is stopped in step c, wherein preferably after step e) the calibration steps a) to e) are repeated at least once, preferably several times, with each repetition a different first speed is set in step a) and calibration values are determined from the plurality of determined pressure differences at the different speeds.

It is even more preferred if the second speed is different from zero and, after the completion of a first calibration process in step e), at least one, preferably several subsequent calibration processes comprising calibration steps c) to e) are carried out, with each repeated calibration process in step c) a second speed different from the second speed in the previous calibration process is set and in step e) the pressure difference between the second pressure determined in step d) of the previous calibration process and the pressure determined in step d) of the current calibration process is determined and calibration values are determined the several determined pressure differences can be determined at the different speeds.

The method can be developed by forming a characteristic curve and reading out a pressure loss value lying between two measuring points by averaging between these two measuring points and / or forming a characteristic curve and reading out the pressure loss value lying beyond the area covered by the measuring points by extrapolation from at least two measuring points.

Finally, it is preferred if the drive device is switched off when the speed falls below a predetermined minimum speed.

The further aspects described above and their respective developments have features or method steps which make them particularly suitable for being carried out with the pump device or control device according to the invention.

For the advantages, design variants and design details of the various aspects of the solutions described here and their respective possible further developments, reference is also made to the description of the corresponding features, details and advantages of the other aspects and their further developments.

• 1: eine schematische Darstellung einer Pumpenanordnung und mehrere Behälter;
• 2: ein Flussdiagramm zur Bestimmung eines Füllstandes eines Fluides in einem Behälter;
• 3a: einen zeitlichen Druckverlauf aufgetragen über die Zeit;
• 3b: einen Drehzahlverlauf und einen dazu korrespondierenden Druckverlauf über die Zeit;
• 4: ein Flussdiagramm zu einem ersten Kalibrierungsverfahren;
• 5: ein Flussdiagramm zu einem zweiten Kalibrierungsverfahren.

Preferred exemplary embodiments are explained by way of example with the aid of the accompanying figures. Show it:

• 1 : a schematic representation of a pump arrangement and several containers;
• 2 : a flow chart for determining a fill level of a fluid in a container;
• 3a : a pressure curve over time plotted over time;
• 3b : a speed curve and a corresponding pressure curve over time;
• 4th : a flowchart for a first calibration method;
• 5 : a flowchart for a second calibration method.

1 shows a pump arrangement 1 and several containers 3a , 3b , 3c , 3d . There is one fluid in each of the containers. The containers each have an actual fluid level 4a , 4b , 4c , 4d and a desired fluid level 5a , 5b , 5c , 5d on, wherein in the state shown here, the actual fluid level and the target fluid level differ from one another. The pump arrangement 1 can be connected to each of the tanks on the suction or pressure side by means of a line. The pump arrangement is in the state shown here 1 is by means of a line 2c with a container 3c and with another line 2 B with another container 3b tied together. The difference hd characterizes the height difference between the pump arrangement 1 and the connection point at which the line 2 B , 2c with the respective container 3b , 3c connected is. The height hi denotes the height difference between the connection point at which the line is in each case 2 B , 2c with the respective container 3b , 3c is connected and the respective actual fluid level 4b , 4c . Via one on the pump assembly 1 connected pressure sensor, the static pressure on the pump arrangement 1 detected. A control device, which is also on the pump assembly 1 is arranged, calculated from the measured static Pressure, the medium density of the fluid, the dynamic pressure reduction and the specific system pressure loss, the geodetic height of the fluid level in relation to the pump chamber. A fully automatic calibration is carried out to determine the system-specific dynamic pressure reduction and the pressure loss characteristic. The automatically controlled start-up of different speeds of a drive device which drives a displacement arrangement in the pump arrangement, a characteristic curve required for regulating the fluid level is determined. By entering the medium density of the fluid and the height distance hd between the pump chamber and the container outlet, the control device calculates the fluid level hi in the container 3b , 3c . After entering a target level in the container, the control device checks whether the actual level is above the target level and, if necessary, increases the speed of the drive device of the pump arrangement in order to adjust the actual fluid level to the target fluid level. If the entered target fluid level is reached, the speed of the drive device is reduced and the target fluid level is maintained.

2 FIG. 11 shows a flow chart for determining a fluid level of a fluid in a container. A pump arrangement is connected to a container via a line. With the start 10 During the process, the flow velocity is determined 20th . The pressure is also determined 40 by means of a pressure sensor which is located on the pump arrangement. In a further step 30th a pressure loss is determined using a known system pressure loss characteristic and the measured flow velocity. In a subsequent step 50 the calculation of the actual fluid level takes place. In a further step 60 the actual fluid level is compared with a desired fluid level. If the actual fluid level corresponds to the target fluid level, the rotational speed of the drive device of the pump arrangement is not changed 70 and then the flowchart again from the start 10 go through the procedure. If the actual fluid level is above the target fluid level, the rotational speed of the drive device of the pump arrangement is increased 90 to pump fluid out of the container. Then the flowchart starts again from the start 10 go through the procedure. If the actual fluid level is below the target fluid level, the speed of the drive device of the pump arrangement is reduced 80 . Then the flowchart starts again from the start 10 go through the procedure.

3a shows a diagram in which the pressure p is plotted against time t. Such a pressure curve over time with such pressure fluctuations can occur if the speed of the drive device of the pump arrangement has been changed, in particular during start and stop processes, since the fluid is strongly accelerated here. If the speed is then kept at a constant value, the pressure oscillations decrease, as can be seen in the diagram as time progresses. At time t0 the oscillation range of the pressure oscillation is at its maximum and then decreases continuously until at time t1 the oscillation range is very small and the standard deviation of the pressure falls below a certain value. The point in time t1 is also called the steady state.

3b shows two diagrams in which the speed n and the pressure p are plotted over time t. From the point in time t0 to tb, the speed n of the drive device is increased linearly and held at a certain value at the point in time tb. The pressure p also increases with the increase in the speed n. At the point in time tb, there are pressure fluctuations, as in FIG 3a shown. The pressure fluctuations decrease with the passage of time and reach the steady state at the time tc. From the point in time td to te, the speed n of the drive device is again increased linearly and held at a certain value at the point in time te. The pressure p also increases with the increase in the speed n. At the point in time te there are again pressure fluctuations, as in 3a shown. The pressure fluctuations decrease again with advancing time and again reach the steady state at the point in time tf. If there are large pressure fluctuations, the pressure cannot be measured reliably. A pressure measurement is therefore only carried out when the standard deviation of the pressure has fallen below a certain value and therefore only when the steady state has occurred.

4th shows a flow chart for a first calibration method. Such a calibration method can be carried out when a pump arrangement is connected to a container via a line. The first calibration procedure is used to determine a specific system pressure loss characteristic as a function of the flow velocity. After the start 100 a first pressure measurement was made during the calibration process 110 in the steady state. A first speed is then approached 120 , wherein the control device outputs a control signal in order to control the first speed of the drive device and to approach the first speed. As it like to 3a and 3b If pressure oscillations occur when starting a speed, a settling time is first waited until the standard deviation of the pressure has fallen below a certain value and the steady state has thus occurred. A first dynamic measurement is then carried out 130 of the pressure, the speed being recorded at the same time and a flow velocity at the pressure sensor being determined therefrom on the basis of the pump parameters and the flow cross-section of the flow path at the level of the pressure sensor. The pump arrangement is then stopped 140 , i.e. the speed is set to the value 0. Now there are again pressure fluctuations and a settling time is waited again until the standard deviation of the pressure has fallen below a certain value and the steady state has thus occurred. A second pressure measurement is then carried out 150 in the steady state.

The pressure difference between the pressures determined by the first and the second pressure measurement is then calculated by a control device of the pump arrangement 190 . The fluid levels can be determined from these stationary pressure measurements by means of the determined pressures. The fluid level present between the first and second pressure measurement in the steady state can be determined by means of interpolation between the two times of the first pressure measurement in the steady state and the second pressure measurement in the steady state. By means of such an interpolation, the fluid level at the time of the dynamic measurement of the pressure can be determined approximately. The system pressure loss and the influence of the flow rate on the pressure sensor for an operating state of the pump arrangement at the first speed and the first pressure can be stored from the pressure difference.

Further calibration runs then take place in that the pressure determined by the first pressure measurement is overwritten with the pressure determined by the second pressure measurement 160 , then another speed is approached 170 and then the steps 130 , 140 , 150 , 180 and 190 be carried out again. Each calibration pass takes place at a different speed, so that pressure measurements are taken at different speeds. Several - for example a total of five - calibration runs are carried out one after the other. then the calibration procedure is ended 199 .

5 shows a flow chart for a second calibration method. Such a calibration method can be carried out when a pump arrangement is connected to a container via a line. The second calibration procedure is used to determine a specific system pressure loss characteristic as a function of the flow velocity. After the start 200 a first pressure measurement was made during the calibration process 210 . A first speed is then approached 220 , wherein the control device outputs a control signal in order to control the speed of the drive device and to approach the first speed. As it like to 3a and 3b If pressure oscillations occur when starting a speed, a settling time is first waited until the standard deviation of the pressure has fallen below a certain value and the steady state has thus occurred. A first measurement is then made 230 of pressure, speed and flow rate. After the first measurement, a second measurement of pressure, speed and flow rate takes place 250 . A pressure difference is then determined from the pressure determined by the first pressure measurement and the pressure determined from the second pressure measurement. The pressure difference is stored as a system pressure loss for an operating state of the pump arrangement at the first speed and the first pressure. Further calibration passes then take place in that the pressure determined by the first pressure measurement is overwritten with the pressure determined by the second pressure measurement, and a further speed is then approached 270 and then the steps 230 , 250 , 290 be carried out again. Each calibration pass takes place at a different speed, so that pressure measurements are taken at different speeds. Several - for example a total of five - calibration runs are carried out one after the other. then the calibration procedure is ended 299 .

Claims (21)

Pump arrangement for conveying a fluid, comprising - a pump housing with a pump chamber, - an inlet opening and an outlet opening, - a displacement arrangement which is arranged in the pump chamber and is movably mounted relative to the pump chamber for a pump displacement movement which promotes the fluid from the inlet - causes to the outlet opening, - a drive device which is mechanically coupled to the displacement arrangement for driving the displacement arrangement in the pump displacement movement, - a flow path that extends between the inlet opening and the outlet opening and in which the fluid flows when the displacement arrangement through the Drive device is driven, characterized by - a sensor arrangement which is arranged in the flow path and comprises a pressure sensor which is designed to detect pressure in the flow path of the fluid and to generate pressure sensor signals from the detected pressures, - a St control device which is connected to the sensor arrangement for signal transmission and is designed to carry out the following control steps: a) receiving a first pressure sensor signal which indicates a pressure of the fluid in the flow path, preferably in the pump chamber, characterized by the sensor arrangement, the first pressure sensor signal being received while the displacement arrangement is being driven, b) determining a pressure in the flow path from the first pressure sensor signal, c) determining a flow velocity at the position of the pressure sensor, wherein the flow speed characterizes the speed of the fluid conveyed from the inlet opening to the outlet opening, from a second sensor signal of the sensor arrangement and / or from a speed of the drive device and / or from a speed of the displacement arrangement, d) determining a system pressure loss by using the determined flow speed and / or of the determined pressure, a value for the system pressure loss is read out from a predetermined assignment of the system pressure loss to the pressure and / or to the flow rate, which is stored in the control device, e) determining a st static pressure at the inlet opening or at the outlet opening, from the determined system pressure loss and the determined pressure, f) determining the difference between the determined static pressure at the inlet opening or at the outlet opening and a predetermined target pressure at the inlet opening or at the outlet opening, g) Generating and outputting a control signal to the drive device as a function of the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening, the control signal being designed to increase the speed to control the drive device and, with the resulting conveyance of the fluid through the displacement arrangement, the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening rringern, wherein a level adjustment comprising the control steps a) to f) or a) to g) is preferably carried out several times within a predetermined time interval, particularly preferably at regular time intervals. Pump arrangement according to Claim 1 , wherein the control device is designed to carry out the control step: - Provision of standard data, which contain values related to the pump arrangement, for determining the system pressure loss by means of the standard data. Pump arrangement according to Claim 1 or 2 , the control device being designed to carry out the control step: performing a calibration in an installed state in which the pump arrangement is fluidically connected to a container, in order to determine installation-specific values for the system pressure loss. Pump arrangement according to at least one of the preceding claims, characterized in that the control device is designed to carry out the following calibration steps to determine the predetermined stored assignment of the system pressure loss to the pressure and / or to the flow rate: a) Output of a control signal that is designed to increase the speed to control the drive device and to approach a first speed, b) determining a first pressure in the flow path from a first pressure sensor signal of the pressure sensor during the first speed, c) outputting a control signal which is designed to control the speed of the drive device and a second from to approach the first different speed, d) determining a second pressure in the flow path from a second pressure sensor signal of the pressure sensor during the second speed, e) determining the pressure difference between the one determined in calibration step b) most pressure and the second pressure determined in calibration step d) and storing the pressure difference as a system pressure loss for an operating state of the pump arrangement at the first speed and the first pressure. Pump arrangement according to Claim 4 , wherein the control device is designed to carry out the following calibration step to determine the predetermined assignment of the system pressure loss to the pressure and / or to the flow rate: Waiting for a waiting time until the pressure sensor signal from the sensor arrangement has settled, in particular by waiting for a predetermined period of time or by a standard deviation several pressure sensor signals detected within a time interval is determined, and receiving the pressure sensor signal after the waiting time, in particular after the predetermined period of time has elapsed or after the determined standard deviation has fallen below a predetermined value, this calibration step preferably between calibration steps a) and b) and / or between the calibration steps c) and d) takes place. Pump arrangement according to one of the Claims 4 or 5 , characterized in that the second speed is equal to zero and the drive device is stopped in step c). Pump arrangement according to Claim 6 , characterized in that after step e) the calibration steps a) to e) are repeated at least once, preferably several times, with each repetition in step a) setting a different first speed and calibration values from the several determined pressure differences at the different speeds be determined. Pump arrangement according to at least one of the Claims 4 or 5 , characterized in that the second speed is different from zero and after the completion of a first calibration process in step e) at least one, preferably several subsequent calibration processes comprising the calibration steps c) to e) are carried out, with each repeated calibration process in step c) a second speed different from the second speed in the previous calibration process is set and in step e) the pressure difference between the second pressure determined in step d) of the previous calibration process and the pressure determined in step d) of the current calibration process is determined and calibration values from the plurality determined pressure differences can be determined at the different speeds. Pump arrangement according to one of the Claims 6 - 8th , the control device being designed to carry out the following calibration step: forming a characteristic curve and reading out a pressure loss value lying between two measuring points by averaging between these two measuring points and / or forming a characteristic curve and reading out the pressure loss value lying beyond the area covered by the measuring points Extrapolation from at least two measuring points and / or formation of a characteristic curve and reading out a pressure loss value lying between two measuring points by interpolation between these two measuring points. Pump arrangement according to one of the preceding claims, wherein the control device is designed to carry out the following control step when the speed falls below a predetermined minimum speed: - Switching off the drive device. Control device for a pump arrangement for conveying a fluid, with a sensor arrangement which is arranged in a flow path and comprises a pressure sensor which is designed for pressure detection in the flow path of the fluid and for generating pressure sensor signals from the detected pressures, is connected and designed for signal transmission is to perform control steps: a) Receiving a first pressure sensor signal, which characterizes a pressure of the fluid in the flow path, preferably in a pump chamber, from the sensor arrangement, the receiving of the first pressure sensor signal during operation of the pump arrangement, in particular while driving a displacement arrangement in a pump chamber of the pump arrangement , he follows, b) determining a pressure in the flow path from the first pressure sensor signal, c) determining a flow speed at the position of the pressure sensor, the flow speed characterizing the speed of the fluid conveyed from the inlet opening to the outlet opening, from a second sensor signal from the sensor arrangement and / or from a speed of a drive device and / or from a speed of a displacement arrangement, d) determining a system pressure loss by using the determined flow velocity and / or the determined pressure to read a value for the system pressure loss from an assignment of the system pressure loss to the pressure and / or to the flow velocity stored in the control device, e) Determining a static pressure at an inlet opening or at an outlet opening from the system pressure loss determined and the pressure determined, f) determining the difference between the determined static pressure at the inlet opening or at the outlet opening and a predetermined target pressure at the inlet opening or at the outlet opening, g) Generating and outputting a control signal to the drive device as a function of the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening, the control signal being designed to increase the speed to control a drive device and to reduce the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined target pressure at the inlet opening or at the outlet opening with the resulting promotion of the fluid through a displacement arrangement, with preferably a level adjustment comprising the Control steps a) to f) or a) to g) are carried out several times within a predetermined time interval, particularly preferably at regular time intervals, Control device according to Claim 11 , characterized in that the control device is developed according to the features of the control device of the pump arrangement according to one of the Claims 2 - 10 . Firmware update data set for a firmware of a control device according to the preceding Claim 11 or 12th and / or for firmware of a control device of a pump arrangement according to one of the Claims 1 - 11 , wherein the firmware update comprises information for the control device in order to program a control device to carry out the following control steps when the firmware update data record is running on a control device: a) receiving a first pressure sensor signal which indicates a pressure of the fluid in the flow path, preferably in a pump chamber, characterized by the sensor arrangement, the first pressure sensor signal being received during operation of the pump arrangement, in particular while driving a displacement arrangement in a pump chamber of the pump arrangement, b) determining a pressure in the flow path from the first pressure sensor signal , c) determining a flow speed at the position of the pressure sensor, the flow speed characterizing the speed of the fluid conveyed from the inlet opening to the outlet opening, from a second sensor signal of the sensor arrangement and / or from a speed l a drive device and / or from a speed of a displacement arrangement, d) determining a system pressure loss by reading out a value for the system pressure loss from an assignment of the system pressure loss to the pressure and / or to the flow rate stored in the control device on the basis of the determined flow velocity and / or the determined pressure e) determining a static pressure at an inlet opening or at an outlet opening from the determined system pressure loss and the determined pressure, f) determining the difference between the determined static pressure at the inlet opening or at the outlet opening and a predetermined target pressure at the Inlet opening or at the outlet opening, g) generating and outputting a control signal to the drive device as a function of the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint Pressure at the inlet opening or at the outlet opening, the control signal being designed to control the speed of a drive device and, with the resulting delivery of the fluid through a displacement arrangement, the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined target To reduce the pressure at the inlet opening or at the outlet opening, preferably a level adjustment comprising the control steps a) to f) or a) to g) being carried out several times within a predetermined time interval, particularly preferably at regular time intervals. Firmware update after Claim 13 , characterized in that the firmware update comprises information for the control device for performing the control steps according to the features of the control device of the pump arrangement according to one of the Claims 2 - 10 . Method for adjusting a fluid level of a fluid in a container by means of a pump arrangement, preferably a pump arrangement according to one of the Claims 1 - 10 , with a sensor arrangement which is arranged in a flow path and comprises a pressure sensor which is designed to detect pressure in the flow path of the fluid and to generate pressure sensor signals from the detected pressures for signal transmission, with the steps of: a) receiving a first Pressure sensor signal which characterizes a pressure of the fluid in the flow path, preferably in a pump chamber, from the sensor arrangement, the first pressure sensor signal being received during operation of the pump arrangement, in particular while driving a displacement arrangement in a pump chamber of the pump arrangement, b) Determining a pressure in the flow path from the first pressure sensor signal, c) determining a flow velocity at the position of the pressure sensor, the flow velocity characterizing the velocity of the fluid conveyed from the inlet opening to the outlet opening, from a second sensori gnal of the sensor arrangement and / or from a speed of a drive device and / or from a speed of a displacement arrangement, d) determining a system pressure loss by using the determined flow rate and / or the determined pressure a value for the system pressure loss from an assignment of the system pressure loss stored in a control device is read out for pressure and / or flow velocity, e) determining a static pressure at an inlet opening or at an outlet opening, from the determined system pressure loss and the determined pressure, the inlet opening or the outlet opening being in fluid connection with the container, f) determining the Difference between the determined static Pressure at the inlet opening or at the outlet opening and a predetermined target pressure at the inlet opening or at the outlet opening, g) generating and outputting a control signal to the drive device as a function of the difference between the determined static pressure at the inlet opening or at the outlet opening and the predetermined setpoint pressure at the inlet opening or at the outlet opening, the control signal being designed to control the speed of a drive device and, with the resulting delivery of the fluid through a displacement arrangement, the difference between the determined static pressure at the inlet opening or at the outlet opening and to reduce the predetermined target pressure at the inlet opening or at the outlet opening, preferably a level adjustment comprising the control steps a) to f) or a) to g) several times within a predetermined time interval, particularly preferably at regular intervals n time intervals. Procedure according to Claim 15 , the following calibration steps being carried out to determine the predetermined assignment of the system pressure loss to the pressure and / or to the flow rate: a. Outputting a control signal which is designed to control the speed of the drive device and to approach a first speed, b. Determining a first pressure in the flow path from a first pressure sensor signal of the pressure sensor during the first rotational speed, c. Outputting a control signal which is designed to control the speed of the drive device and to approach a second speed different from the first, d. Determining a second pressure in the flow path from a second pressure sensor signal of the pressure sensor during the second rotational speed, e. Determining the pressure difference between the first pressure determined in calibration step b) and the second pressure determined in calibration step d) and storing the pressure difference as a system pressure loss for an operating state of the pump arrangement at the first speed and the first pressure. Procedure according to Claim 15 or 16 , the following calibration step being carried out to determine the predetermined assignment of the system pressure loss to the pressure and / or to the flow rate: Waiting for a first waiting time until the pressure sensor signal from the sensor arrangement has settled, in particular by waiting for a predetermined first time period or by a standard deviation of several within one Time interval detected pressure sensor signals is determined, and receiving the first pressure sensor signal after the first waiting time, in particular after the predetermined first time span or after the determined standard deviation has fallen below a predetermined value, this calibration step preferably between calibration steps a) and b) and / or between the calibration steps c) and d) takes place. Method according to one of the Claims 16 or 17th , characterized in that the second speed is equal to zero and the drive device is stopped in step c, wherein preferably after step e) the calibration steps a) to e) are repeated at least once, preferably several times, with each repetition in step a) a different first speed is set and calibration values are determined from the plurality of determined pressure differences at the different speeds. Method according to at least one of the Claims 16 or 17th , characterized in that the second speed is different from zero and after the completion of a first calibration process in step e) at least one, preferably several subsequent calibration processes comprising the calibration steps c) to e) are carried out, with each repeated calibration process in step c) a second speed different from the second speed in the previous calibration process is set and in step e) the pressure difference between the second pressure determined in step d) of the previous calibration process and the pressure determined in step d) of the current calibration process is determined and calibration values from the plurality determined pressure differences can be determined at the different speeds. Method according to one of the Claims 15 until 19th , characterized by the following calibration steps: - Forming a characteristic curve and reading out a pressure loss value lying between two measuring points by averaging between these two measuring points and / or - Forming a characteristic curve and reading out the pressure loss value lying beyond the area covered by the measuring points by extrapolation from at least two measuring points. Method according to one of the preceding Claims 15 - 20th , wherein the drive device is switched off when the speed falls below a predetermined minimum speed.

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