EP3864292B1 - System for detecting dry running of a pump - Google Patents
System for detecting dry running of a pump Download PDFInfo
- Publication number
- EP3864292B1 EP3864292B1 EP19786481.2A EP19786481A EP3864292B1 EP 3864292 B1 EP3864292 B1 EP 3864292B1 EP 19786481 A EP19786481 A EP 19786481A EP 3864292 B1 EP3864292 B1 EP 3864292B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- resistance
- counter
- counter reading
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000004020 conductor Substances 0.000 claims description 51
- 238000011156 evaluation Methods 0.000 claims description 41
- 239000007788 liquid Substances 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 23
- 239000002826 coolant Substances 0.000 claims description 16
- 238000009736 wetting Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims 5
- 238000005259 measurement Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
- F04B49/106—Responsive to pumped volume
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
- F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
- F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
- F04D15/0227—Lack of liquid level being detected using a flow transducer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
- F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
- F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
- F04D15/0245—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/09—Flow through the pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Definitions
- the invention relates to a system for detecting that a pump is running dry. Furthermore, the invention relates to a pump, in particular a coolant pump, with detection of dry running of the pump. Furthermore, the invention relates to a method for detecting that a pump is running dry.
- a pump is used in a wide range of applications, for example as a coolant pump for cooling system components.
- thermal management of the electric drive and its components or the battery is necessary.
- a coolant that flows past the temperature-sensitive components is used for cooling.
- the coolant flow is provided by a coolant pump. Due to the mechanical properties of the coolant pump, dry running of the pump should be avoided as far as possible in order to prevent damage to the pump assemblies.
- the pump design of the coolant pump can be designed in such a way that the pump can withstand dry running for a certain minimum time without mechanical damage to its components. This can be achieved, for example, by designing the pump, for example the design of the bearings.
- a system for detecting dry running of a pump in particular a coolant pump, which makes it possible to reliably detect dry running of the pump recognize.
- a pump, in particular a coolant pump, with detection of dry running of the pump is to be specified, which makes it possible to reliably detect dry running of the pump, with the production-related outlay being limited and the pump therefore cost-effective is producible.
- a further concern of the present invention is to specify a method for detecting dry running of a pump, with which dry running of the pump can be reliably detected.
- An embodiment of a system for detecting that a pump is running dry is specified in claim 1 .
- a system for detecting that a pump is running dry comprises an inlet device for supplying an electrically conductive liquid to an intake device of the pump. Furthermore, the system includes an electrical resistance structure which is arranged in the inflow device.
- the electrical resistance structure has a variable resistance value as a function of wetting with the electrically conductive liquid.
- the resistance structure is designed such that the resistance structure has a first resistance value when it is wetted with the electrically conductive liquid and a second resistance value when it is not wetted with the electrically conductive liquid, the first resistance value being smaller than the second resistance value.
- the resistance structure has a first and a second connection for tapping off a voltage.
- the system also includes an evaluation circuit for determining the resistance value of the resistance structure, the evaluation circuit being designed to detect dry running of the pump when the evaluation circuit determines the second resistance value between the first and the second connection of the resistance structure.
- the resistance structure has conductor track sections that are connected to one another, the conductor track sections having at least one conductor track section made of a first material and at least one further conductor track section made of a second material, the first material having a higher electrical conductivity than the second material.
- the evaluation circuit is designed to determine a line break within the resistance structure if the evaluation circuit does not detect any current when a voltage is applied between the first and the second connection of the resistance structure.
- a meandering structure of the conductor track can be arranged in the inlet device, for example.
- the resistance structure has low-impedance conductor track sections, between which high-impedance conductor track sections are arranged.
- the low-impedance conductor track sections can be arranged, for example, along the flow side of the pump or parallel to the direction of flow of a liquid into the pump be. Electrical connections or conductor track sections with a higher resistance can be arranged transversely or at right angles to the low-impedance conductor track sections.
- the conductor track sections made of the high-impedance electrically conductive material can be arranged, for example, transversely to the direction of flow, while the conductor track sections made of the low-impedance electrically conductive material are arranged in the direction of flow of the liquid.
- Patent claim 8 specifies an embodiment of a pump, in particular a coolant pump, with detection of dry running of the pump.
- the pump comprises a system for detecting dry running of the pump according to one of Claims 1 to 7, the inflow device being arranged on a suction side of the pump.
- Patent claim 10 specifies a method for detecting that a pump is running dry.
- a system for detecting dry running of the pump according to one of Claims 1 to 7 is used to carry out the method. First, a resistance value of the resistance structure of the pump is determined. The determined resistance value of the resistance structure is compared with a resistance threshold value. Dry running of the pump is established if the comparison establishes that the determined resistance value of the resistance structure is above the resistance threshold value.
- a system 1 for detecting dry running of a pump, in particular a coolant pump includes an inlet device 10 for supplying an electrically conductive liquid to an intake device of a pump. Furthermore, the system 1 includes an electrical resistance structure 20 which is arranged in the inlet device 10 .
- the electrical resistance structure 20 has a variable resistance value depending on wetting with the electrically conductive liquid.
- the resistance structure 20 is designed in such a way that the resistance structure has a first resistance value when it is wetted with the electrically conductive liquid and has a second resistance value when it is not wetted with the electrically conductive liquid.
- the first resistance is less than the second resistance. This means that in the event of wetting with the electrically conductive liquid, the resistance structure has a lower resistance value than when no electrically conductive liquid is present in the inflow device 10 and the resistance structure 20 is therefore not wetted.
- FIG. 2A shows a possible embodiment of the electrical resistance structure 20, which is arranged inside the inlet device 10.
- the resistance structure 20 has a first connection A20a and a second connection A20b for tapping off a voltage. Between the first and the second connection A20a and A20b, the resistance structure 20 has at least one conductor track section made of a first material and at least one further conductor track section made of a second material on. The first material has a higher electrical
- Conductivity than the second material or the first material is a low-impedance electrically conductive material, while the second material is a high-impedance electrically conductive material.
- the resistance structure 20 can be arranged in a meandering manner between the first connection A20a and the second connection A20b.
- the at least one conductor track section made of the first material and the at least one further conductor track section made of the second material can be arranged, for example, at right angles to one another.
- the resistance structure 20 can be arranged in the inlet device 10 in particular in such a way that the at least one conductor track section made of the first material runs in the longitudinal direction of the inlet device 10 and the at least one further conductor track section made of the second material runs transversely to the longitudinal direction of the intake pipe 10.
- the resistance structure 20 comprises the conductor track sections 21 to 27.
- the conductor track sections 21, 23, 25 and 27 have a material with high electrical conductivity (electrically low-impedance material), while the conductor track sections 22, 24 and 26 have a material with low electrical conductivity (electrically high-impedance material).
- the resistance structure 20 can be arranged in the inlet device 10 in such a way that the conductor track sections 21 , 23 , 25 and 27 are arranged in the direction of flow of the electrically conductive liquid or in the longitudinal direction of the inlet device 10 .
- the conductor track sections 22, 24 and 26 are arranged transversely to the direction of flow or transversely/perpendicularly to the longitudinal direction of the inlet device 10.
- the resistance structure 20 between the first and the second connection A20a and A20b have a first conductor track section made of the first material, a second conductor track section made of the second material and a third conductor track section made of the first material.
- the first conductor track section can be arranged between the first connection A20a and the second conductor track section.
- the third conductor track section can be arranged between the second connection A20b and the second conductor track section.
- the second conductor track section can be arranged between the first conductor track section and the third conductor track section.
- the resistance structure 20 comprises two conductor track sections made of a low-impedance electrically conductive material and one conductor track section made of a high-impedance electrically conductive material.
- FIG. 1 shows a further embodiment of a system 1 for detecting that a pump is running dry.
- the resistance structure 20 is shown in FIG Figure 2B executed as in Figure 2A . It is pointed out that the resistance structure 20 can have more or fewer conductor track sections.
- the system 1 is not limited to the meandering configuration of the resistance structure 20 shown.
- the resistive structure 20 is shown in the system 1 of FIG Figure 2B wetted by an electrically conductive liquid 2.
- the electrically conductive liquid 2 bridges the high-impedance conductor track sections 22, 24 and 26 with low electrical resistance, so that the resistance value of the resistance structure 20 falls compared to a case in which the resistance structure 20 is not wetted by the liquid 2.
- the system 1 for detecting dry running of a pump includes an evaluation circuit 3 for determining the resistance value of the resistance structure 20.
- the evaluation circuit 3 is connected to the first and second connection A20a and A20b of the resistance structure 20.
- the evaluation circuit 3 is to designed to detect dry running of the coolant pump when the evaluation circuit between the first connection A20a and the second connection A20b of the resistance structure 20 determines the second resistance value specified above, ie a high resistance value. If, on the other hand, the evaluation circuit 3 detects the above-mentioned first resistance value, ie a low resistance value, between the first and second connection A20a and A20b of the resistance structure 20, the resistance structure 20 is as in FIG Figure 2B is shown wetted by the electrically conductive liquid 2 .
- the evaluation circuit 3 can thus determine whether the electrically conductive liquid 2 is in the inlet device to the pump or whether the pump is running dry.
- the evaluation circuit 3 is also designed to determine a line break within the resistance structure 20 . If the resistance structure 20 is not wetted by an electrically conductive liquid, with the resistance structure 20 intact, a small current nevertheless flows via the individual conductor track sections connected to one another. If, on the other hand, one of the conductor track sections is broken, no current is detected by the evaluation circuit 3 when a voltage is applied between the first connection A20a and the second connection A20b.
- the evaluation circuit 3 can have a Wheatstone measuring bridge 30 or an operational amplifier circuit 40, for example.
- figure 3 shows a possible configuration of a Wheatstone measuring bridge 30 for determining the resistance value of the resistance structure 20 between the first connection A20a and the second connection A20b.
- the resistors 31 and 32 are specified with fixed resistance values, while resistor 33 is a variable resistor.
- the variable resistance 33 is varied, for example, until the bridge voltage/measuring voltage Ub is approximately 0 V.
- the resistance value of the resistance structure 20 changes due to wetting with the electrically conductive liquid or due to a lack of wetting by the electrically conductive liquid, a change occurs in the measurement voltage/bridge voltage Ub, which allows the resistance value of the resistance structure 20 to be inferred.
- FIG 4 shows a pump 4, in particular a coolant pump, with detection of dry running of the pump.
- the pump 4 comprises one of the above-described embodiments of the system for detecting a dry running of the pump.
- the inlet device 10 is arranged on a suction side 11 of the pump 4 .
- the inlet device 10 is used to supply an electrically conductive liquid to a suction device 60 of the pump for sucking in the electrically conductive liquid.
- the inlet device 10 can be designed as a coupling piece/adapter for coupling a line to the pump 4 or as an intake pipe of the pump.
- the resistance structure 20 can be arranged, for example, on the inner walls of the inlet device 10 .
- the electrical resistance structure 20 has a variable resistance value depending on wetting with the electrically conductive liquid.
- a method for detecting that the pump 1 is running dry is specified below.
- a resistance value of the resistance structure 20 of the pump 1 is determined by means of the resistance structure 20 and the evaluation circuit 3 connected thereto.
- the evaluation circuit 3 compares the determined resistance value of the resistance structure 20 with a resistance threshold value. If it is determined during the comparison that the determined resistance value of the resistance structure 20 is above the resistance threshold value lies, dry running of the coolant pump 1 can be determined.
- figure 5 shows a flow chart of a method for determining dry running of a pump with debouncing of the input signal in order to avoid disruptions in operation due to temporary effects.
- the evaluation circuit 3 has a counter circuit 50 ( Figure 2B ) for incrementing and decrementing a count of counter circuit 50.
- the evaluation circuit 3 is designed in particular to decrement or increment the count of the counter circuit 50 depending on whether the determined resistance value is above or below the resistance threshold value. Furthermore, the evaluation circuit 3 is designed to determine whether the counter reading of the counter circuit 50 is above or below a counter reading threshold value. Furthermore, the evaluation circuit 3 is designed to determine that the pump 4 is running dry depending on whether the counter reading of the counter circuit 50 is above or below the counter reading threshold value.
- the evaluation circuit 3 is designed, in particular, to end operation of the pump 4 when dry running of the pump 4, ie a high resistance value of the resistance structure 20, has been detected.
- step S1 the counter of the counter circuit is set to an initial state/initial count.
- step S2 the resistance value of the resistance structure 20 is measured between the first connection A20a and the second connection A20b.
- step S3 the previously determined resistance value is compared with the resistance threshold value.
- step S4 a distinction is made as to whether the resistance value is small or large, ie whether it is below or above the resistance threshold value.
- the counter reading of the counter circuit 50 is then incremented or decremented depending on whether the determined resistance value is above or below the resistance threshold value (method steps S5 and S6).
- the evaluation circuit 3 is thus designed to change the counter reading of the counter circuit 50 starting from an initial counter reading. The initial count may be below the threshold count.
- the exemplary process flow shown is decremented when the counter reading of the counter circuit 50 is determined in process step S4 that the measured resistance value of the resistance structure 20 is small and the resistance structure 20 is therefore presumably wetted by the electrically conductive liquid. If, on the other hand, it is determined in step S4 that the resistance value of the resistance structure 20 is high, in particular above the resistance threshold value, the counter reading of the counter circuit 50 is incremented in method step S6.
- the evaluation circuit 3 can thus be designed to decrement a counter reading of the counter circuit 50 if the determined resistance value is below the resistance threshold value. Furthermore, the evaluation circuit 3 can be designed to increment the counter reading of the counter circuit 50 if the determined resistance value is above the resistance threshold value.
- step S7 it is determined whether the current count of counter circuit 50 is above or below the count threshold value.
- dry running of the pump 4 can be determined (method steps S8 and S9). For example, if it is determined that the counter reading of the counter circuit 50 is below the counter reading threshold value, it can it can be concluded that the resistance structure 20 is wetted by the electrically conductive liquid and therefore there is no dry running. In this case, the pump operation is permitted (step S8). If, on the other hand, it is determined in method step S7 that the counter reading is above the counter reading threshold value, there is a risk of dry running. In this case, the pump operation is not permitted and the operation of the coolant pump is terminated in step S9 to prevent damage to the pump.
- the evaluation circuit 3 is thus designed to determine that the pump 4 is running dry and to end the operation of the pump 4 when the evaluation circuit 3 determines that the counter reading of the counter circuit 50 is below the counter reading threshold value.
- the procedure runs continuously.
- the specified test algorithm can thus be used to check whether the pump is running dry.
- the test algorithm can be used to avoid short-term disturbances in the input measurement, since dry running is only detected when the current meter reading is above the meter reading threshold value.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Die Erfindung betrifft ein System zum Erkennen eines Trockenlaufs einer Pumpe. Des Weiteren betrifft die Erfindung eine Pumpe, insbesondere eine Kühlmittelpumpe, mit Erkennen eines Trockenlaufs der Pumpe. Des Weiteren betrifft die Erfindung ein Verfahren zum Erkennen eines Trockenlaufs einer Pumpe.The invention relates to a system for detecting that a pump is running dry. Furthermore, the invention relates to a pump, in particular a coolant pump, with detection of dry running of the pump. Furthermore, the invention relates to a method for detecting that a pump is running dry.
Eine Pumpe wird in vielfältigen Anwendungsgebieten, beispielsweise als Kühlmittelpumpe zum Kühlen von Systemkomponenten, eingesetzt. In modernen Brennkraftmaschinen beziehungsweise Elektrofahrzeugen ist beispielsweise ein Thermomanagement des Elektroantriebs und dessen Komponenten beziehungsweise der Batterie notwendig. Zur Kühlung dient ein Kühlmittel, das an den temperaturempfindlichen Komponenten vorbeiströmt. Der Kühlmittelstrom wird durch eine Kühlmittelpumpe bereitgestellt. Aufgrund der mechanischen Eigenschaften der Kühlmittelpumpe soll möglichst ein Trockenlauf der Pumpe vermieden werden, um eine Schädigung von Baugruppen der Pumpe zu vermeiden.A pump is used in a wide range of applications, for example as a coolant pump for cooling system components. In modern internal combustion engines or electric vehicles, for example, thermal management of the electric drive and its components or the battery is necessary. A coolant that flows past the temperature-sensitive components is used for cooling. The coolant flow is provided by a coolant pump. Due to the mechanical properties of the coolant pump, dry running of the pump should be avoided as far as possible in order to prevent damage to the pump assemblies.
Das Pumpendesign der Kühlmittelpumpe kann derart ausgestaltet sein, dass die Pumpe für eine gewisse Mindestzeit einen Trockenlauf ohne mechanische Beschädigung ihrer Komponenten überstehen kann. Dies kann beispielsweise über die Auslegung der Pumpe, zum Beispiel die Auslegung der Lager, erreicht werden.The pump design of the coolant pump can be designed in such a way that the pump can withstand dry running for a certain minimum time without mechanical damage to its components. This can be achieved, for example, by designing the pump, for example the design of the bearings.
In der Patentschrift
Es ist wünschenswert, ein System zum Erkennen eines Trockenlaufs einer Pumpe, insbesondere einer Kühlmittelpumpe anzugeben, das es ermöglicht, einen Trockenlauf der Pumpe zuverlässig zu erkennen. Des Weiteren soll eine Pumpe, insbesondere eine Kühlmittelpumpe mit Erkennen eines Trockenlaufs der Pumpe angegeben werden, die es ermöglicht, einen Trockenlauf der Pumpe zuverlässig zu erkennen, wobei der herstellungstechnisch bedingte Aufwand begrenzt und die Pumpe somit kostengünstig herstellbar ist. Ein weiteres Anliegen der vorliegenden Erfindung ist es, ein Verfahren zum Erkennen eines Trockenlaufs einer Pumpe anzugeben, mit dem sich ein Trockenlauf der Pumpe zuverlässig erkennen lässt.It is desirable to specify a system for detecting dry running of a pump, in particular a coolant pump, which makes it possible to reliably detect dry running of the pump recognize. Furthermore, a pump, in particular a coolant pump, with detection of dry running of the pump is to be specified, which makes it possible to reliably detect dry running of the pump, with the production-related outlay being limited and the pump therefore cost-effective is producible. A further concern of the present invention is to specify a method for detecting dry running of a pump, with which dry running of the pump can be reliably detected.
Eine Ausführungsform eines Systems zum Erkennen eines Trockenlaufs einer Pumpe ist im Patentanspruch 1 angegeben.An embodiment of a system for detecting that a pump is running dry is specified in claim 1 .
Ein System zum Erkennen eines Trockenlaufs einer Pumpe umfasst eine Zulaufeinrichtung zum Zuführen einer elektrisch leitfähigen Flüssigkeit zu einer Ansaugeinrichtung der Pumpe. Weiterhin umfasst das System eine elektrische Widerstandsstruktur, die in der Zulaufeinrichtung angeordnet ist. Die elektrische Widerstandsstruktur weist in Abhängigkeit von einer Benetzung mit der elektrisch leitfähigen Flüssigkeit einen veränderlichen Widerstandswert auf. Die Widerstandsstruktur ist derart ausgebildet, dass die Widerstandsstruktur bei der Benetzung mit der elektrisch leitfähigen Flüssigkeit einen ersten Widerstandswert und bei einer fehlenden Benetzung mit der elektrisch leitfähigen Flüssigkeit einen zweiten Widerstandswert aufweist, wobei der erste Widerstandswert kleiner ist als der zweite Widerstandswert.A system for detecting that a pump is running dry comprises an inlet device for supplying an electrically conductive liquid to an intake device of the pump. Furthermore, the system includes an electrical resistance structure which is arranged in the inflow device. The electrical resistance structure has a variable resistance value as a function of wetting with the electrically conductive liquid. The resistance structure is designed such that the resistance structure has a first resistance value when it is wetted with the electrically conductive liquid and a second resistance value when it is not wetted with the electrically conductive liquid, the first resistance value being smaller than the second resistance value.
Die Widerstandsstruktur wiest einen ersten und einen zweiten Anschluss zum Abgreifen einer Spannung auf. Das System umfasst weiter eine Auswerteschaltung zum Ermitteln des Widerstandswerts der Widerstandsstruktur, wobei die Auswerteschaltung dazu ausgebildet ist, einen Trockenlauf der Pumpe zu erkennen, wenn die Auswerteschaltung zwischen dem ersten und dem zweiten Anschluss der Widerstandsstruktur den zweiten Widerstandswert feststellt.The resistance structure has a first and a second connection for tapping off a voltage. The system also includes an evaluation circuit for determining the resistance value of the resistance structure, the evaluation circuit being designed to detect dry running of the pump when the evaluation circuit determines the second resistance value between the first and the second connection of the resistance structure.
Die Widerstandsstruktur weist zwischen dem ersten und dem zweiten Anschluss miteinander verbundene Leiterbahnabschnitte auf, wobei die Leiterbahnabschnitte mindestens einen Leiterbahnabschnitt aus einem ersten Material und mindestens einen weiteren Leiterbahnabschnitt aus einem zweiten Material aufweisen, wobei das erste Material eine höhere elektrische Leitfähigkeit als das zweite Material aufweist. Die Auswerteschaltung ist dazu ausgebildet, einen Leitungsbruch innerhalb der Widerstandsstruktur festzustellen, wenn die Auswerteschaltung beim Anlegen einer Spannung zwischen dem ersten und dem zweiten Anschluss der Widerstandsstruktur keinen Strom detektiert.Between the first and the second connection, the resistance structure has conductor track sections that are connected to one another, the conductor track sections having at least one conductor track section made of a first material and at least one further conductor track section made of a second material, the first material having a higher electrical conductivity than the second material. The evaluation circuit is designed to determine a line break within the resistance structure if the evaluation circuit does not detect any current when a voltage is applied between the first and the second connection of the resistance structure.
Um zu erkennen, ob in der Zulaufeinrichtung eine (elektrisch leitfähige) Flüssigkeit vorhanden ist, kann beispielsweise eine mäanderförmige Struktur der Leiterbahn in der Zulaufeinrichtung angeordnet sein. Gemäß der Erfindung weist die Widerstandsstruktur niederohmige Leiterbahnabschnitte, zwischen denen hochohmige Leiterbahnabschnitte angeordnet sind, auf. Die niederohmigen Leiterbahnabschnitte können beispielsweise längs zur Strömungsseite der Pumpe beziehungsweise parallel zur Strömungsrichtung einer Flüssigkeit in die Pumpe angeordnet sein. Quer beziehungsweise rechtwinklig zu den niederohmigen Leiterbahnabschnitten können elektrische Verbindungen beziehungsweise Leiterbahnabschnitte mit höherem Widerstand angeordnet sein. Die Leiterbahnabschnitte aus dem hochohmigen elektrisch leitfähigen Material können beispielsweise quer zur Strömungsrichtung angeordnet sein, während die Leiterbahnabschnitte aus dem niederohmigen elektrisch leitfähigen Material in Strömungsrichtung der Flüssigkeit angeordnet sind.In order to detect whether an (electrically conductive) liquid is present in the inlet device, a meandering structure of the conductor track can be arranged in the inlet device, for example. According to the invention, the resistance structure has low-impedance conductor track sections, between which high-impedance conductor track sections are arranged. The low-impedance conductor track sections can be arranged, for example, along the flow side of the pump or parallel to the direction of flow of a liquid into the pump be. Electrical connections or conductor track sections with a higher resistance can be arranged transversely or at right angles to the low-impedance conductor track sections. The conductor track sections made of the high-impedance electrically conductive material can be arranged, for example, transversely to the direction of flow, while the conductor track sections made of the low-impedance electrically conductive material are arranged in the direction of flow of the liquid.
Eine Ausführungsform einer Pumpe, insbesondere einer Kühlmittelpumpe, mit Erkennen eines Trockenlaufs der Pumpe ist im Patentanspruch 8 angegeben.Patent claim 8 specifies an embodiment of a pump, in particular a coolant pump, with detection of dry running of the pump.
Die Pumpe umfasst ein System zum Erkennen eines Trockenlaufs der Pumpe nach einem der Ansprüche 1 bis 7, wobei die Zulaufeinrichtung auf einer Saugseite der Pumpe angeordnet ist. Ein Verfahren zum Erkennen eines Trockenlaufs einer Pumpe ist im Patentanspruch 10 angegeben.The pump comprises a system for detecting dry running of the pump according to one of Claims 1 to 7, the inflow device being arranged on a suction side of the pump.
Zur Ausführung des Verfahrens wird ein System zum Erkennen eines Trockenlaufs der Pumpe nach einem der Ansprüche 1 bis 7 verwendet. Zunächst wird ein Widerstandswert der Widerstandsstruktur der Pumpe ermittelt. Der ermittelte Widerstandswert der Widerstandsstruktur wird mit einem Widerstandsschwellwert verglichen. Ein Trockenlauf der Pumpe wird festgestellt, wenn bei dem Vergleich festgestellt wird, dass der ermittelte Widerstandswert der Widerstandsstruktur über dem Widerstandsschwellwert liegt.A system for detecting dry running of the pump according to one of Claims 1 to 7 is used to carry out the method. First, a resistance value of the resistance structure of the pump is determined. The determined resistance value of the resistance structure is compared with a resistance threshold value. Dry running of the pump is established if the comparison establishes that the determined resistance value of the resistance structure is above the resistance threshold value.
Die Erfindung wird im Folgenden anhand von Figuren, die Ausführungsbeispiele der vorliegenden Erfindung zeigen, näher erläutert.The invention is explained in more detail below with reference to figures showing exemplary embodiments of the present invention.
Es zeigen:
- Figur 1
- eine Ausführungsform eines Systems zum Erkennen eines Trockenlaufs einer Pumpe,
- Figur 2A
- eine Ausführungsform einer elektrischen Widerstandsstruktur eines Systems zum Erkennen eines Trockenlaufs einer Pumpe,
- Figur 2B
- eine Ausführungsform eines Systems zum Erkennen eines Trockenlaufs einer Pumpe mit einer Auswerteschaltung,
Figur 3- eine Ausführungsform einer Wheatstone-Messbrücke zum Ermitteln eines Widerstandswerts einer elektrischen Widerstandsstruktur,
- Figur 4
- eine Ausführungsform einer Pumpe mit Erkennen eines Trockenlaufs der Pumpe,
Figur 5- ein Ablaufdiagramm für ein Verfahren zum Erkennen eines Trockenlaufs einer Pumpe.
- figure 1
- an embodiment of a system for detecting dry running of a pump,
- Figure 2A
- an embodiment of an electrical resistance structure of a system for detecting dry running of a pump,
- Figure 2B
- an embodiment of a system for detecting dry running of a pump with an evaluation circuit,
- figure 3
- an embodiment of a Wheatstone measuring bridge for determining a resistance value of an electrical resistance structure,
- figure 4
- an embodiment of a pump with detection of dry running of the pump,
- figure 5
- a flowchart for a method for detecting dry running of a pump.
Ein System 1 zum Erkennen eines Trockenlaufs einer Pumpe, insbesondere einer Kühlmittelpumpe, umfasst eine Zulaufeinrichtung 10 zum Zuführen einer elektrisch leitfähigen Flüssigkeit zu einer Ansaugeinrichtung einer Pumpe. Des Weiteren umfasst das System 1 eine elektrische Widerstandsstruktur 20, die in der Zulaufeinrichtung 10 angeordnet ist. Die elektrische Widerstandsstruktur 20 weist in Abhängigkeit von einer Benetzung mit der elektrisch leitfähigen Flüssigkeit einen veränderlichen Widerstandswert auf.A system 1 for detecting dry running of a pump, in particular a coolant pump, includes an
Die Widerstandsstruktur 20 ist derart ausgebildet, dass die Widerstandsstruktur bei der Benetzung mit der elektrisch leitfähigen Flüssigkeit einen ersten Widerstandswert und bei einer fehlenden Benetzung mit der elektrisch leitfähigen Flüssigkeit einen zweiten Widerstandswert aufweist. Der erste Widerstandswert ist kleiner als der zweite Widerstandswert. Dies bedeutet, dass die Widerstandsstruktur im Falle einer Benetzung mit der elektrisch leitfähigen Flüssigkeit einen niedrigeren Widerstandswert aufweist, als wenn keine elektrisch leitfähige Flüssigkeit in der Zulaufeinrichtung 10 vorhanden ist und die Widerstandsstruktur 20 somit nicht benetzt ist.The
Leitfähigkeit als das zweite Material auf beziehungsweise ist das erste Material ein niederohmiges elektrisch leitfähiges Material, während das zweite Material ein hochohmiges elektrisch leitfähiges Material ist.Conductivity than the second material or the first material is a low-impedance electrically conductive material, while the second material is a high-impedance electrically conductive material.
Die Widerstandsstruktur 20 kann zwischen dem ersten Anschluss A20a und dem zweiten Anschluss A20b mäanderförmig angeordnet sein. Der mindestens eine Leiterbahnabschnitt aus dem ersten Material und der mindestens eine weitere Leiterbahnabschnitt aus dem zweiten Material können beispielsweise rechtwinklig zueinander angeordnet sein. Die Widerstandsstruktur 20 kann insbesondere derart in der Zulaufeinrichtung 10 angeordnet sein, dass der mindestens eine Leiterbahnabschnitt aus dem ersten Material in Längsrichtung der Zulaufeinrichtung 10 verläuft und der mindestens eine weitere Leiterbahnabschnitt aus dem zweiten Material quer zu der Längsrichtung des Ansaugrohrs 10 verläuft.The
Bei der in
Die Widerstandsstruktur 20 kann derart in der Zulaufeinrichtung 10 angeordnet sein, dass die Leiterbahnabschnitte 21, 23, 25 und 27 in Strömungsrichtung der elektrisch leitfähigen Flüssigkeit beziehungsweise in Längsrichtung der Zulaufeinrichtung 10 angeordnet sind. Die Leiterbahnabschnitte 22, 24 und 26 sind quer zur Strömungsrichtung beziehungsweise quer/rechtwinklig zur Längsrichtung der Zulaufeinrichtung 10 angeordnet.The
Gemäß einer einfachen Ausführungsform der Widerstandsstruktur kann die Widerstandsstruktur 20 zwischen dem ersten und dem zweiten Anschluss A20a und A20b einen ersten Leiterbahnabschnitt aus dem ersten Material, einen zweiten Leiterbahnabschnitt aus dem zweiten Material und einen dritten Leiterbahnabschnitt aus dem ersten Material aufweisen. Der erste Leiterbahnabschnitt kann zwischen dem ersten Anschluss A20a und dem zweiten Leiterbahnabschnitt angeordnet sein. Der dritte Leiterbahnabschnitt kann zwischen dem zweiten Anschluss A20b und dem zweiten Leiterbahnabschnitt angeordnet sein. Der zweite Leiterbahnabschnitt kann zwischen dem ersten Leiterbahnabschnitt und dem dritten Leiterbahnabschnitt angeordnet sein. Die Widerstandsstruktur 20 umfasst bei dieser vereinfachten Ausführungsform zwei Leiterbahnabschnitte aus einem niederohmigen elektrisch leitfähigen Material und einen Leiterbahnabschnitt aus einem hochohmigen elektrisch leitfähigen Material.According to a simple embodiment of the resistance structure the
Das System 1 zum Erkennen eines Trockenlaufs einer Pumpe umfasst eine Auswerteschaltung 3 zum Ermitteln des Widerstandswerts der Widerstandsstruktur 20. Die Auswerteschaltung 3 ist an dem ersten und zweiten Anschluss A20a und A20b der Widerstandsstruktur 20 angeschlossen. Die Auswerteschaltung 3 ist dazu ausgebildet, einen Trockenlauf der Kühlmittelpumpe zu erkennen, wenn die Auswerteschaltung zwischen dem ersten Anschluss A20a und dem zweiten Anschluss A20b der Widerstandsstruktur 20 den oben angegebenen zweiten Widerstandswert, also einen hohen Widerstandswert, feststellt. Wenn die Auswerteschaltung 3 hingegen zwischen dem ersten und zweiten Anschluss A20a und A20b der Widerstandsstruktur 20 den oben erwähnten ersten Widerstandswert, also einen niedrigen Widerstandswert, feststellt, ist die Widerstandsstruktur 20, wie in
Aufgrund einer Widerstandsmessung zwischen dem ersten Anschluss A20a und dem zweiten Anschluss A20b der Widerstandsstruktur 20 kann somit von der Auswerteschaltung 3 festgestellt werden, ob sich die elektrisch leitfähige Flüssigkeit 2 in der Zulaufeinrichtung zu der Pumpe befindet oder ob ein Trockenlauf der Pumpe vorliegt.Based on a resistance measurement between the first connection A20a and the second connection A20b of the
Die Auswerteschaltung 3 ist des Weiteren dazu ausgebildet, einen Leitungsbruch innerhalb der Widerstandsstruktur 20 festzustellen. Wenn die Widerstandsstruktur 20 nicht von einer elektrisch leitfähigen Flüssigkeit benetzt ist, fließt bei intakter Widerstandsstruktur 20 dennoch ein geringer Strom über die einzelnen miteinander verbundenen Leiterbahnabschnitte. Wenn hingegen einer der Leiterbahnabschnitte gebrochen ist, wird beim Anlegen einer Spannung zwischen dem ersten Anschluss A20a und dem zweiten Anschluss A20b kein Strom von der Auswerteschaltung 3 detektiert.The
Die Auswerteschaltung 3 kann beispielsweise eine Wheatstone-Messbrücke 30 oder eine Operationsverstärkerschaltung 40 aufweisen.
Im Folgenden wird ein Verfahren zum Erkennen eines Trockenlaufs der Pumpe 1 angegeben. Mittels der Widerstandsstruktur 20 und der daran angeschlossenen Auswerteschaltung 3 wird ein Widerstandswert der Widerstandsstruktur 20 der Pumpe 1 ermittelt. Die Auswerteschaltung 3 vergleicht den ermittelten Widerstandswert der Widerstandsstruktur 20 mit einem Widerstandsschwellwert. Wenn bei dem Vergleich festgestellt wird, dass der ermittelte Widerstandswert der Widerstandsstruktur 20 über dem Widerstandsschwellwert liegt, kann ein Trockenlauf der Kühlmittelpumpe 1 festgestellt werden.A method for detecting that the pump 1 is running dry is specified below. A resistance value of the
Zur Ausführung des Verfahrens weist die Auswerteschaltung 3 eine Zählerschaltung 50 (
Zu Beginn des Verfahrens im Schritt S1 wird der Zähler der Zählerschaltung auf einen Anfangszustand/Anfangszählerstand gesetzt. Im Schritt S2 erfolgt die Messung des Widerstandswerts der Widerstandsstruktur 20 zwischen dem ersten Anschluss A20a und dem zweiten Anschluss A20b. Im Schritt S3 wird der zuvor ermittelte Widerstandswerts mit dem Widerstandsschwellwert verglichen. Im Schritt S4 wird unterschieden, ob der Widerstandswert klein oder groß ist, das heißt unter oder über dem Widerstandsschwellwert liegt.At the beginning of the method in step S1, the counter of the counter circuit is set to an initial state/initial count. In step S2, the resistance value of the
Anschließend wird der Zählerstand der Zählerschaltung 50 in Abhängigkeit davon, ob der ermittelte Widerstandswert über oder unter dem Widerstandsschwellwert liegt, inkrementiert oder dekrementiert (Verfahrensschritte S5 und S6). Die Auswerteschaltung 3 ist somit dazu ausgebildet, den Zählerstand der Zählerschaltung 50 ausgehend von einem Anfangszählerstand zu verändern. Der Anfangszählerstand kann unter dem Zählerstandsschwellwert liegen.The counter reading of the
Insbesondere bei dem in
Gemäß einer möglichen Ausführungsform kann die Auswerteschaltung 3 somit dazu ausgebildet sein, einen Zählerstand der Zählerschaltung 50 zu dekrementieren, wenn der ermittelte Widerstandswert unter dem Widerstandsschwellwert liegt. Des Weiteren kann die Auswerteschaltung 3 dazu ausgebildet sein, den Zählerstand der Zählerschaltung 50 zu inkrementieren, wenn der ermittelte Widerstandswert über dem Widerstandsschwellwert liegt.According to one possible embodiment, the
Im Verfahrensschritt S7 wird ermittelt, ob der aktuelle Zählerstand der Zählerschaltung 50 über oder unter dem Zählerstandsschwellwert liegt. In Abhängigkeit davon, ob der Zählerstand der Zählerschaltung 50 über oder unter dem Zählerstandsschwellwert liegt, kann der Trockenlauf der Pumpe 4 festgestellt werden (Verfahrensschritte S8 und S9). Wenn beispielsweise festgestellt wird, dass der Zählerstand der Zählerschaltung 50 unter dem Zählerstandsschwellwert liegt, kann darauf geschlossen werden, dass die Widerstandsstruktur 20 von der elektrisch leitfähigen Flüssigkeit benetzt ist und somit kein Trockenlauf vorliegt. In diesem Fall ist die Pumpenoperation erlaubt (Verfahrensschritt S8). Wenn hingegen im Verfahrensschritt S7 festgestellt wird, dass der Zählerstand über dem Zählerstandsschwellwert liegt, besteht die Gefahr eines Trockenlaufs. In diesem Fall ist die Pumpenoperation nicht erlaubt und der Betrieb der Kühlmittelpumpe wird im Verfahrensschritt S9 beendet, um eine Schädigung der Pumpe zu verhindern.In method step S7, it is determined whether the current count of
Die Auswerteschaltung 3 ist somit dazu ausgebildet, den Trockenlauf der Pumpe 4 festzustellen und den Betrieb der Pumpe 4 zu beenden, wenn die Auswerteschaltung 3 feststellt, dass der Zählerstand der Zählerschaltung 50 unter dem Zählerstandsschwellwert liegt.The
Das Verfahren wird permanent ausgeführt. Durch den angegebenen Prüfalgorithmus kann somit eine Prüfung auf einen Trockenlauf der Pumpe durchgeführt werden. Durch den Prüfalgorithmus können kurzfristige Störungen bei der Eingangsmessung vermieden werden, da der Trockenlauf erst dann festgestellt wird, wenn der aktuelle Zählerstand über dem Zählerstandsschwellwert liegt.The procedure runs continuously. The specified test algorithm can thus be used to check whether the pump is running dry. The test algorithm can be used to avoid short-term disturbances in the input measurement, since dry running is only detected when the current meter reading is above the meter reading threshold value.
Ein weiterer Vorteil des in
Claims (12)
- System for detecting dry running of a pump, comprising:- an inlet device (10) for feeding an electrically conductive liquid to an intake device (60) of the pump (4) for taking in the electrically conductive liquid (2),- an electrical resistance structure (20), which is arranged in the inlet device (10),- wherein the electrical resistance structure (20) has a variable resistance value, dependent on wetting with the electrically conductive liquid (2).- wherein the resistance structure (20) is designed in such a way that the resistance structure has a first resistance value when it is wetted with the electrically conductive liquid (2) and a second resistance value when it is not wetted with the electrically conductive liquid,- wherein the first resistance value is smaller than the second resistance value.- wherein the resistance structure (20) has a first and a second terminal (A20a, A20b) for tapping off a voltage,- an evaluation circuit (3) for determining the resistance value of the resistance structure (20),- wherein the evaluation circuit (3) is designed to detect dry running of the pump (4) when the evaluation circuit (3) determines the second resistance value between the first and the second terminal (A20a, A20b) of the resistance structure (20), characterized in that- the resistance structure (20) has between the first and the second terminal (A20a, A20b) interconnected conductor track sections, wherein the conductor track sections have at least one conductor track section (21, 23, 25, 27) made of a first material and at least one further conductor track section (22, 24, 26) made of a second material, wherein the first material has a higher electrical conductivity than the second material, and- the evaluation circuit (3) is designed to determine a line break within the resistance structure (20) if the evaluation circuit (3) does not detect a current when a voltage is applied between the first and the second terminal (A20a, A20b) of the resistance structure (20).
- System according to Claim 1,
wherein the resistance structure (20) is arranged in a meandering form between the first and the second terminal (A20a, A20b). - System according to Claim 1 or 2,
wherein the resistance structure (20) is arranged in the inlet device (10) in such a way that the at least one conductor track section (21, 23, 25, 27) runs in the longitudinal direction of the inlet device (10) and the at least one further conductor track section (22, 24, 26) runs transversely to the longitudinal direction of the inlet device (10). - System according to one of Claims 1 to 3,
wherein the evaluation circuit (3) has a Wheatstone measuring bridge (30) or an operational amplifier circuit (40). - System according to one of Claims 1 to 4,- wherein the evaluation circuit (3) has a counter circuit (50) for incrementing and decrementing a counter reading of the counter circuit (50),- wherein the evaluation circuit (3) decrements or increments the counter reading of the counter circuit (50), dependent on whether the determined resistance value is above or below a resistance threshold value,- wherein the evaluation circuit (3) is designed to determine whether the counter reading of the counter circuit (50) is above or below a counter reading threshold value,- wherein the evaluation circuit (3) is designed to determine dry running of the pump (4), dependent on whether the counter reading of the counter circuit (50) is above or below the counter reading threshold value, and to end operation of the pump (4) if dry running of the pump has been established.
- System according to Claim 5,- wherein the evaluation circuit (3) decrements a counter reading of the counter circuit (50) if the determined resistance value is below the resistance threshold value, and increments the counter reading of the counter circuit (50) if the determined resistance value is above the resistance threshold value,- wherein the evaluation circuit (3) is designed to determine dry running of the pump (4) and to end operation of the pump (4) if the evaluation circuit (3) establishes that the counter reading of the counter circuit (50) is below the counter reading threshold value.
- System according to Claim 6,
wherein the evaluation circuit (3) changes the counter reading of the counter circuit (50) starting from an initial counter reading, the initial counter reading being below the counter reading threshold value. - Pump, in particular a coolant pump, with detection of dry running of the pump, comprising:- a system (1) for detecting dry running of the pump (4) according to one of Claims 1 to 7,- the inlet device (10) being arranged on an intake side (11) of the pump (4).
- Pump according to Claim 8,
wherein the inlet device (10) is designed as a coupling piece for coupling a line to the pump (4) or as an intake pipe of the pump. - Method for detecting dry running of a pump, comprising the following steps:- providing a system (1) for detecting dry running of a pump (4) according to one of Claims 1 to 7,- determining a resistance value of the resistance structure (20),- comparing the determined resistance value of the resistance structure (20) with a resistance threshold value,- finding that the pump (4) is running dry if it has been established in the comparison that the determined resistance value of the resistance structure (20) is above the resistance threshold value.
- Method according to Claim 10, comprising the following steps:- decrementing or incrementing the counter reading of the counter circuit (50), dependent on whether the determined resistance value is above or below the resistance threshold value,- determining whether the counter reading of the counter circuit (50) is above or below the counter reading threshold value,- establishing dry running of the pump (4), dependent on whether the counter reading of the counter circuit (50) is above or below the counter reading threshold value,- ending operation of the pump (4) if dry running of the pump has been established.
- Method according to Claim 11, comprising the following step:
changing the counter reading of the counter circuit (50) starting from an initial counter reading, the initial counter reading being below the counter reading threshold value.
Applications Claiming Priority (2)
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DE102018217154.8A DE102018217154B4 (en) | 2018-10-08 | 2018-10-08 | System for detecting dry running of a pump |
PCT/EP2019/076307 WO2020074289A1 (en) | 2018-10-08 | 2019-09-27 | System for detecting dry running of a pump |
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EP3864292B1 true EP3864292B1 (en) | 2022-08-17 |
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US (1) | US12006939B2 (en) |
EP (1) | EP3864292B1 (en) |
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CN202597131U (en) * | 2012-05-19 | 2012-12-12 | 浙江利欧股份有限公司 | Dry running protection control device of turbine type water pump |
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JP6143492B2 (en) * | 2013-02-26 | 2017-06-07 | エスアイアイ・セミコンダクタ株式会社 | Charge / discharge control circuit, charge / discharge control device, and battery device |
US9612170B2 (en) * | 2015-07-21 | 2017-04-04 | Apple Inc. | Transparent strain sensors in an electronic device |
DE102016005467A1 (en) * | 2016-05-06 | 2017-11-09 | Fresenius Medical Care Deutschland Gmbh | Medical treatment device and tubing set for a medical treatment device and method for monitoring a peristaltic peristaltic pump |
US10634146B2 (en) * | 2017-10-25 | 2020-04-28 | SafeSump, Inc. | Water pumping control device and system |
GB2568284B (en) * | 2017-11-10 | 2021-09-22 | Aspen Pumps Ltd | Liquid level sensor and method of controlling a condensate pump |
-
2018
- 2018-10-08 DE DE102018217154.8A patent/DE102018217154B4/en active Active
-
2019
- 2019-09-27 EP EP19786481.2A patent/EP3864292B1/en active Active
- 2019-09-27 CN CN201980064725.8A patent/CN112840126B/en active Active
- 2019-09-27 US US17/283,481 patent/US12006939B2/en active Active
- 2019-09-27 WO PCT/EP2019/076307 patent/WO2020074289A1/en unknown
Also Published As
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DE102018217154A1 (en) | 2020-04-09 |
US12006939B2 (en) | 2024-06-11 |
CN112840126A (en) | 2021-05-25 |
EP3864292A1 (en) | 2021-08-18 |
WO2020074289A1 (en) | 2020-04-16 |
DE102018217154B4 (en) | 2022-02-17 |
US20210396235A1 (en) | 2021-12-23 |
CN112840126B (en) | 2023-05-26 |
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