EP3864292A1 - System zum erkennen eines trockenlaufs einer pumpe - Google Patents
System zum erkennen eines trockenlaufs einer pumpeInfo
- Publication number
- EP3864292A1 EP3864292A1 EP19786481.2A EP19786481A EP3864292A1 EP 3864292 A1 EP3864292 A1 EP 3864292A1 EP 19786481 A EP19786481 A EP 19786481A EP 3864292 A1 EP3864292 A1 EP 3864292A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- resistance
- counter
- circuit
- dry running
- 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.)
- Granted
Links
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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 dry running of a pump. Furthermore, the invention relates to a pump, in particular a coolant pump, with detection of a dry running of the pump. Furthermore, the invention relates to a method for detecting dry running of a pump.
- a pump is used in a wide range of applications, for example as a coolant pump for cooling system components.
- a coolant pump for cooling system components.
- thermal management of the electric drive and its components or the battery is necessary.
- a coolant is used for cooling, which flows past the temperature-sensitive components.
- 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 avoid damage to the pump assemblies.
- the pump design of the coolant pump can be designed such that the pump can withstand a dry run for a certain minimum time without mechanical damage to its components. This can be achieved, for example, by designing the pump, for example designing 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.
- a pump, in particular a coolant pump with detection of a dry running of the pump is to be specified, which makes it possible to reliably detect a dry running of the pump, the production-related complexity limiting and the pump thus being cost-effective can be produced.
- Another concern of the present invention is to provide a method for detecting a dry running of a pump, with which a dry running of the pump can be reliably detected.
- An embodiment of a system for detecting a dry run of a pump is specified in claim 1.
- a system for detecting dry running of a pump comprises an inlet device for supplying an electrically conductive liquid to a suction device of the pump. Furthermore, the system comprises an electrical resistance structure, which is arranged in the inlet device. The electrical resistance structure has a variable resistance value as a function of wetting with the electrically conductive liquid.
- a meandering structure of the conductor track can be arranged in the inlet device, for example.
- the electrically conductive structure can be designed in such a way that the electrically conductive structure has a low resistance when wetted with the electrically conductive liquid. Conversely, when there is no wetting with the electrically conductive liquid, the electrically conductive structure has a higher resistance value.
- the electrical resistance structure is in particular an electrical conductor track structure.
- the resistance structure can have low-resistance conductor track sections, between which high-resistance conductor track sections are arranged.
- the low-resistance 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. Transversely or at right angles to the low-resistance conductor track sections, electrical connections or conductor track sections with higher resistance can be arranged.
- the conductor track sections made of the high-resistance electrically conductive material can, for example, be arranged transversely to the direction of flow, while the conductor track sections made of the low-resistance electrically conductive material are arranged in the flow direction of the liquid.
- the system can also have an evaluation circuit for determining the resistance value of the resistance structure.
- the resistance structure can be designed such that the resistance structure has a large resistance value if the resistance structure is not wetted by the electrically conductive liquid or if there are no electrically conductive ones in the inlet device on the suction side of the pump
- the resistance structure If the resistance structure is wetted by an electrically conductive liquid, the high-resistance connections or conductor track sections of the resistance structure are bridged with low resistance, so that the resistance value of the resistance structure drops.
- a potential dry running of the coolant pump can thus be recognized by the evaluation circuit if the evaluation circuit determines that the resistance structure has a large resistance value. Conversely, the wetting of the resistance structure with the electrically conductive liquid can be recognized if it is determined by the evaluation circuit that the resistance structure has a low resistance value.
- the pump comprises a system for detecting dry running of the pump according to one of claims 1 to 10, wherein the inlet device is arranged on a suction side of the pump.
- a method for detecting dry running of a pump is specified in claim 13.
- a system for detecting dry running of the pump according to one of claims 1 to 10 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. A dry running of the pump is determined if the comparison determines that the determined resistance value of the resistance structure lies above the resistance threshold value.
- Figure 1 shows an embodiment of a system for recognizing a
- Figure 2A shows an embodiment of an electrical resistor
- Figure 2B shows an embodiment of a system for recognizing a
- Figure 3 shows an embodiment of a Wheatstone measuring bridge for
- FIG. 4 shows an embodiment of a pump with detection of dry running of the pump
- Figure 5 is a flowchart for a method for detecting dry running of a pump.
- a system 1 for detecting dry running of a pump, in particular a coolant pump comprises an inlet device 10 for supplying an electrically conductive liquid to a suction device of a pump.
- the system 1 further comprises an electrical resistance structure 20, which is arranged in the inlet device 10.
- the electrical resistance structure 20 has a variable resistance value as a function of wetting with the electrically conductive liquid.
- the resistance structure 20 can be formed, for example, such that the resistance structure has a first resistance value when 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 value is less than the second resistance value. This means that the resistance structure in the case of wetting with the electrically conductive liquid has a lower resistance value than when no electrically conductive liquid is present in the inlet 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 in the interior of the inlet device 10.
- the resistance structure 20 has a first connection A20a and a second connection A20b for tapping 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 can have a higher electrical conductivity than the second material or the first material can be a low-resistance electrically conductive material, while the second material is a high-resistance 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, for example, be arranged at right angles to one another.
- the resistance structure 20 can in particular be arranged in the inlet device 10 such 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 resistor structure 20 comprises the conductor track sections 21 to 27.
- the conductor track sections 21, 23, 25 and 27 have a material with a high electrical conductivity (electrically low-resistance material), while the conductor track sections 22, 24 and 26 have a material with a low electrical conductivity (electrically high-resistance material).
- the resistance structure 20 can be arranged in the inlet device 10 such that the conductor track sections 21, 23, 25 and 27 are arranged in the flow direction 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 flow direction or transversely / at right angles to the longitudinal direction of the inlet device 10.
- the resistance structure 20 can be between the first and the second connections 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-resistance electrically conductive material and one conductor track section made of a high-resistance electrically conductive material.
- FIG. 2B shows a further embodiment of a system 1 for detecting dry running of a pump.
- the resistance structure 20 in the illustration in FIG. 2B is designed as in FIG. 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 shown from the resistor structure 20.
- the resistance structure 20 is wetted by an electrically conductive liquid 2. Due to the electrically conductive liquid 2, the high-resistance conductor track sections 22, 24 and 26 are bridged electrically with low resistance, so that the resistance value of the resistance structure 20 decreases in comparison to a case in which the resistance structure 20 is not wetted by the liquid 2.
- the system 1 for detecting a dry running of a pump comprises an evaluation circuit 3 for determining the resistance value of the resistance structure 20.
- the evaluation circuit 3 can be connected to the first and second connections A20a and A20b of the resistance structure 20.
- the evaluation circuit 3 is for this configured 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 detects the above-mentioned second resistance value, for example a high resistance value. If, on the other hand, the evaluation circuit 3 determines the above-mentioned first resistance value, for example a low resistance value, between the first and second connections A20a and A20b of the resistance structure 20, the resistance structure 20 is wetted by the electrically conductive liquid 2, as shown in FIG. 2B .
- 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 can furthermore be designed to determine a fault, for example a line break, within the resistance structure 20. If the resistance structure 20 is not wetted by an electrically conductive liquid, a small current still flows through the individual interconnected interconnect sections when the resistance structure 20 is intact. 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, for example, a Wheatstone measuring bridge 30 or an operational amplifier circuit 40.
- FIG. 3 shows a possible embodiment 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 resistor 33 is varied, for example, until the bridge span
- the voltage / measuring voltage Ub has approximately 0 V. If the resistance value of the resistance structure 20 changes due to wetting with the electrically conductive liquid or due to a lack of wetting with the electrically conductive liquid, a change occurs in the measurement voltage / bridge voltage Ub, which allows a conclusion to be drawn about the resistance value of the resistance structure 20 .
- FIG. 4 shows a pump 4, in particular a coolant pump, with detection of the pump running dry.
- the pump 4 comprises one of the above-described embodiments of the system for detecting a dry running of the pump.
- the feed device 10 is arranged, for example, on a suction side 11 of the pump 4.
- the feed device 10 serves to supply an electrically conductive liquid to a suction device 60 of the pump for sucking in the electrically conductive liquid.
- the running 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 as a function of wetting with the electrically conductive liquid.
- a method for detecting dry running of the pump 1 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 to it.
- the evaluation circuit 3 compares the determined resistance value of the resistance structure 20 with a resistance threshold value. If it is determined in the comparison that the determined resistance value of the resistance structure 20 is above the resistance level threshold, dry running of the coolant pump 1 can be determined.
- FIG. 5 shows a flow chart of a method for determining a dry running of a pump with a debouncing of the input signal in order to avoid malfunctions in operation due to temporary effects.
- the evaluation circuit 3 has a counter circuit 50 (FIG. 2B) for incrementing and decrementing a counter reading of the counter circuit 50.
- the evaluation circuit 3 is in particular designed to decrement or increment the counter reading of the counter circuit 50 depending on whether the resistance value determined 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. Furthermore, the evaluation circuit 3 is designed to determine the dry running of the pump 4 depending on whether the counter reading of the counter circuit 50 is above or below the counter reading threshold.
- the evaluation circuit 3 is designed, in particular, to terminate operation of the pump 4 when the dry running of the pump 4, that is to say a high resistance value of the resistance structure 20, has been determined.
- the counter of the counter circuit is set to an initial state / initial counter reading.
- the resistance value of the resistance structure 20 is measured between the first connection A20a and the second connection A20b.
- 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, that is to say 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 meter reading can be below the meter reading threshold.
- the counter reading of the counter circuit 50 is decremented if it was determined in method step S4 that the measured resistance value of the resistance structure 20 is small and thus the resistance structure 20 is 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 large, in particular above the resistance threshold value, the count 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 lies 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 lies above the resistance threshold value.
- step S7 it is determined whether the current count of the counter circuit 50 is above or below the counter threshold value.
- the dry running of the pump 4 can be determined (method steps S8 and S9). For example, if it is determined that the count of the counter circuit 50 is below the count threshold, may it can be concluded that the resistance structure 20 is wetted by the electrically conductive liquid and thus there is no dry running. In this case, the pump operation is allowed (step S8).
- step S7 it is determined that the meter reading is above the meter 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 ended in method step S9 in order to prevent damage to the pump.
- the evaluation circuit 3 is thus designed to determine the dry running of the pump 4 and to stop 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.
- test for dry running of the pump can thus be carried out using the specified test algorithm.
- the test algorithm can be used to avoid short-term disturbances in the input measurement, since dry running is only determined when the current meter reading is above the meter reading threshold.
- Another advantage of the method shown in FIG. 5 is the possibility of a test run of the pump.
- the pump first runs dry, even if it is determined in method step S4 that the measured resistance value is large compared to the resistance threshold value.
- the pump runs dry until the initial state of the meter has been increased in step S6 to such an extent that the current meter reading is above the meter reading threshold.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018217154.8A DE102018217154B4 (de) | 2018-10-08 | 2018-10-08 | System zum Erkennen eines Trockenlaufs einer Pumpe |
| PCT/EP2019/076307 WO2020074289A1 (de) | 2018-10-08 | 2019-09-27 | System zum erkennen eines trockenlaufs einer pumpe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3864292A1 true EP3864292A1 (de) | 2021-08-18 |
| EP3864292B1 EP3864292B1 (de) | 2022-08-17 |
Family
ID=68210744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19786481.2A Active EP3864292B1 (de) | 2018-10-08 | 2019-09-27 | System zum erkennen eines trockenlaufs einer pumpe |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12006939B2 (de) |
| EP (1) | EP3864292B1 (de) |
| CN (1) | CN112840126B (de) |
| DE (1) | DE102018217154B4 (de) |
| WO (1) | WO2020074289A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12247569B2 (en) * | 2022-03-25 | 2025-03-11 | Modine Manufacturing Company | Pump with combined electrical contact |
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| DE2925830A1 (de) * | 1979-06-27 | 1981-01-15 | Rudolf Steffan | Trockenlaufschutz fuer pumpen aller art |
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| DE4110146A1 (de) * | 1991-03-27 | 1992-10-01 | Hoefelmayr Bio Melktech | Verfahren und vorrichtung zur messung eines der masse eines milchpfropfens entsprechenden wertes sowie des entsprechenden milchflusses |
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-
2018
- 2018-10-08 DE DE102018217154.8A patent/DE102018217154B4/de active Active
-
2019
- 2019-09-27 US US17/283,481 patent/US12006939B2/en active Active
- 2019-09-27 CN CN201980064725.8A patent/CN112840126B/zh active Active
- 2019-09-27 WO PCT/EP2019/076307 patent/WO2020074289A1/de not_active Ceased
- 2019-09-27 EP EP19786481.2A patent/EP3864292B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018217154B4 (de) | 2022-02-17 |
| WO2020074289A1 (de) | 2020-04-16 |
| US20210396235A1 (en) | 2021-12-23 |
| CN112840126A (zh) | 2021-05-25 |
| DE102018217154A1 (de) | 2020-04-09 |
| US12006939B2 (en) | 2024-06-11 |
| EP3864292B1 (de) | 2022-08-17 |
| CN112840126B (zh) | 2023-05-26 |
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