EP1961963B1 - Niveauabhängige Steuerung von Pumpen - Google Patents

Niveauabhängige Steuerung von Pumpen Download PDF

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Publication number
EP1961963B1
EP1961963B1 EP07024706.9A EP07024706A EP1961963B1 EP 1961963 B1 EP1961963 B1 EP 1961963B1 EP 07024706 A EP07024706 A EP 07024706A EP 1961963 B1 EP1961963 B1 EP 1961963B1
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EP
European Patent Office
Prior art keywords
levels
level
pumps
liquid
switch
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.)
Active
Application number
EP07024706.9A
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German (de)
English (en)
French (fr)
Other versions
EP1961963A3 (de
EP1961963A2 (de
Inventor
Fred Brückmann
Jürgen Gröschel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KSB AG
Original Assignee
KSB AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KSB AG filed Critical KSB AG
Priority to SI200731672T priority Critical patent/SI1961963T1/sl
Priority to PL07024706T priority patent/PL1961963T3/pl
Publication of EP1961963A2 publication Critical patent/EP1961963A2/de
Publication of EP1961963A3 publication Critical patent/EP1961963A3/de
Application granted granted Critical
Publication of EP1961963B1 publication Critical patent/EP1961963B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F04D15/029—Stopping of pumps, or operating valves, on occurrence of unwanted conditions for pumps operating in parallel

Definitions

  • the invention relates to a device having a liquid container with one or more pumps, a control device which switches on or off one or more pumps in dependence on the height of the liquid level in the container, and one or more sensors connected to the control device for detecting or a plurality of fluid levels, in particular pump on and off levels, and a method of operating such devices or systems equipped therewith.
  • Such devices are used in sewage lifting plants, which have to promote below the backflow level of a sewer system accumulating water and are usually located in residential buildings. Above all, they serve to extract sewage-containing wastewater, which accumulates in the cellars of such residential buildings. Therefore, they are often referred to as Hurkalienhebeanlagen.
  • a wastewater collection well and a method for its installation and / or operation are known in which a time period between the detection of two different heights of the wastewater level is measured by means of a time measuring device. Since the desired switch-off level of the pump is outside the detection range of the sensor, the required delivery time of the pump is determined as a function of the measured time duration. From this time measured with the pump on, the delivery time is calculated by means of a time multiplier, after which a certain predetermined switch-off level of the pump is reached. Such extrapolation of the required delivery time of the pump is fraught with uncertainties and there is a risk that is lowered below the predetermined Ausschaltility. For applications with small container volumes, as is usual in sewage lifting systems, such a method is not usable.
  • a sewage lifting plant which should have the largest possible switching volume in terms of optimal operation. Since the base area of the waste water tank and the highest possible switch-on level are generally predetermined or limited by the dimensions of the installation, a very low switch-off level is provided structurally.
  • a flexible bendable pipe section is sealed with its first end attached to the suction port of the pump and the second or free end is located closer to the bottom of the wastewater tank than the suction port.
  • the flexible bendable material of the pipe section has the disadvantage that it folds in a pumping of solid admixtures liquids during Abpumpvorgang due to the negative pressure or bending over by solids and it can lead to clogging of the suction port.
  • the EP 0 580 558 A1 shows a device for controlling lift pumps in a dewatering plant with a pressure-operated switch which generates a control signal for the pumps in accordance with the liquid level in the plant, and a dense, flexible chamber containing a fluid and below the level of the liquid to be lifted should be arranged.
  • the invention is therefore based on the problem to provide a device of the type mentioned above, which brings about a safe switch-off level for the pumps with little use of resources with better utilization of the available container volume and changing operating conditions.
  • the solution to the problem provides that during operation the device adapts the switch-off level of at least one of the pumps as a function of the feed quantity of the liquid to be absorbed by the container.
  • the flexible, on-the-fly adjustment of the turn-off levels of one or more pumps enables the device to meet changing operating conditions.
  • the switching levels also referred to below as switching points, are adapted. These may be displaced towards or away from the container bottom during operation. A given, available container volume is thereby better utilized.
  • one and the same device or a device equipped with the device can be used for various applications.
  • the device adapts switch-off levels of the pumps as a function of the feed quantity of the liquid to be absorbed by the container.
  • the feed rate ie the volume per unit time
  • the device is also suitable for large inflow quantities. It is possible that the device raises the Ausschaltlements the pump with a large inflow and / or lowers the shutdown levels of the pumps at a low feed rate.
  • a reliable operation of a device according to the invention or a system equipped with it is ensured even when turbulence in the container and consequent air pockets in the pumped liquid.
  • a device according to the invention with its control device during its operation, is able to lower the switch-off points of the pumps with small feed quantities and thereby optimally utilize the container volume. With large supply quantities, pre-set switch-off levels are maintained and / or the switch-off levels of the pumps are raised.
  • the control device and / or stored in this algorithm are designed to be parameterized accordingly.
  • the device is able to determine the flow of the incoming liquid. This is done constantly during operation of the device, wherein a determination of the flow is carried out continuously, at pre-definable intervals or to certain events.
  • the device determines the inflow quantity by measuring the rise time of the fluid level between at least two measurement levels. As a result of the rise time measured in a time measuring device of the control device and the known container volume, the feed quantity is calculated as feed volume per unit time. Depending on the determined feed rate, the switch-off points are adjusted.
  • a switch-on point of a pump is selected as a first measurement level and a second measurement level is arranged below it.
  • the inflow quantity is advantageously determined when the pumps are at a standstill and before each pump is switched on. As a result, the inflow amount is immediately before a pumping operation with increasing liquid level determines what can be used in a timely manner, the conditions before a pumpdown for a direct adjustment of the switching levels.
  • the controller is able to select the switch-off levels of the pumps from several different switching levels depending on the feed quantity. It is advantageous if the switching and / or measuring levels are given by sensors with one or more individual switching positions. Thus, depending on the feed quantity, a controller can use the appropriate sensor for evaluation in accordance with the desired switch-off level and determine a switching condition based on its switching signals. As sensors, different level sensors of different measuring principles are suitable. The sensors can be arranged in the container or outside the container.
  • the controller is connected to a sensor for detecting a plurality of liquid levels.
  • a sensor for detecting a plurality of liquid levels.
  • Such a sensor allows the detection of individual or all required levels, ie pump startup levels, liquid level rise time measurement in the tank, and all pump off levels.
  • a solution allows a more flexible and finer gradation of switching and / or measurement levels.
  • a sensor with a continuous output signal has proven itself. This can continuously detect the liquid level in the container and provide the control device with an output signal corresponding to the liquid level. This may be a standardized industrial grade output signal. This means that both raising and / or lowering of switch-off levels as well as a determination of the measurement levels or measuring points for measuring the rise time can be realized steplessly.
  • the controller simply forms one or more switching and / or measuring levels.
  • the limit values of individual and / or all switching or measuring levels are defined in the control device.
  • various switching or Measurement levels stored and / or configurable, which are used depending on the plant condition. An assignment can be made by means of a stored table. For example, different alternative switch-off levels are stored in a table depending on the inflow quantity. A determination of the desired switching levels can equally well be done by means of deposited formulas.
  • the measured values recorded by the sensor and transmitted in the form of a sensor output signal are constantly monitored in the control for an overshoot or undershoot in order to control the required switching on and off of the pumps and to detect the start and stop level of measurements.
  • the measurement of the feed rate is effected by a meter arranged on the inlet pipe.
  • the feed rate is constantly measurable. It has proven to be an advantage to carry out the measurement of the inflow quantity at any time and independently of pumping operations which may possibly take place at the moment. Constant consideration of the feed quantity leads to an even more exact adaptability of the switch-off levels to the currently existing conditions.
  • ultrasonic measuring devices or magnetic-inductive flow measuring devices are suitable as measuring devices arranged on the inlet pipe.
  • the measuring signals allow conclusions on the container level.
  • the invention is not fixed to a specific measuring principle.
  • detection of the fluid level by means of a hydrostatic pressure measurement, an ultrasound measurement, by means of optical or capacitive principles or by means of a guided microwave may be mentioned.
  • the sensors can be arranged wholly or partly in the container.
  • the measurement of the liquid level can also be effected by one or more, arranged outside of the container sensors.
  • Has proven to be a measurement of the liquid level by a float arranged in the container the lifting movement is converted into an output signal corresponding to the liquid level.
  • Such level sensors in which a float depending on the liquid level In the container performs a detectable stroke, also represent a cost-effective solution.
  • the device according to the invention has means for detecting impermissibly large inflow quantities and / or means for generating alarms.
  • a method for operating a device according to the invention or a system equipped therewith provides for the shut-off level of at least one of the pumps to be adjusted during operation. This is done in dependence on the feed rate of the liquid to be absorbed by the container.
  • the flow of the incoming liquid is determined.
  • the feed rate is advantageously determined by measuring the rise time of the liquid level between at least two measurement levels.
  • a switch-on point of a pump is selected and a second measurement level is arranged below it.
  • the feed quantity is calculated as feed volume per unit time.
  • the switch-off points are adjusted.
  • An advantageous method allows the determination of the feed rate at standstill of the pump and before each switching on a pump.
  • the switch-off levels of the pumps can be selected from several different switching levels.
  • a plurality of liquid levels be detected by a sensor connected to a control device.
  • a method has proven useful in which a sensor with a continuous output signal is used.
  • Particularly flexible is a method according to which one or more switching and / or measuring levels are formed by the controller.
  • the limit values of individual to all required levels can be defined depending on the plant and operating conditions.
  • An alternative method uses for measuring the feed quantity arranged on the inlet pipe meter.
  • the measurement of the liquid level can be effected by one or more sensors arranged on the outside of the container and / or by a float arranged in the container, the lifting movement of which is converted into an output signal corresponding to the liquid level.
  • the device according to the invention is recommended for lifting installations, in particular for liquids permeated with solid admixtures, that is to say, for example, for wastewater lifting installations.
  • a method for monitoring the operation and output of a sewage pumping station is disclosed, wherein a monitoring device carries out a continuous monitoring of the pump output values and compares the values with measured reference values at a specific, predetermined time.
  • the determination of the container inflow serves only one of the container flow taking into account determination of the flow rate of the pump.
  • the current pump values are compared with those of a new pump and a value degradation is an indicator of pump wear. An adjustment of the switch-off points as a function of the measured feed quantity is not provided.
  • the in the Fig. 1 shown system is located below the backflow level 1, which is characterized here by a triangle.
  • the plant comprises a liquid or collecting container 2, which is connected to a sewer line 3, and a delivery line 4, which opens into a sewer 5.
  • a - not shown - centrifugal pump is arranged, which promotes the sewer 3 flowing fäkalalien Vietnameses and fäkalientransports wastewater via a check valve 6 in the sewer 5.
  • the Fig. 2 shows a lifting system according to the prior art. This is equipped with a centrifugal pump 7, the electric motor 8 is provided with a control device 9. The centrifugal pump 7 with electric motor 8 can be switched on and off by the control device 9. The centrifugal pump 7 is followed by a non-return valve 10.
  • the lifting system has a collecting container 11 with a feed pipe 12 through which liquid can flow into the container.
  • a float switch 13 which responds to three different preset fluid levels: at a minimum fluid level, it gives the signal to stop a Abpump surges “pump OFF”, at a normal high water level, he gives the signal to start a Abpump surges “pump ON”, and at a water level exceeding the latter level, it reports "high water ALARM”.
  • the position of the minimum fluid level "pump OFF” must take into account all supply conditions and provide a correspondingly high safety margin to prevent the centrifugal pump 7 sucking air and no longer delivers.
  • Fig. 3 shows a lifting system, which is equipped with a device according to the invention.
  • This lifting system also has a centrifugal pump 14 with electric motor 15, as well as a collecting container 16 and a feed pipe 17.
  • the centrifugal pump 14 can be switched on or off by a programmable controller 18 connected to the electric motor 15.
  • the control device 18 is equipped with a timing device 19 and a memory device 20.
  • the control device 18 is provided with display and / or operating means, which are not shown here.
  • a plurality of sensors 21, 22, 23 and 24 for detecting a respective liquid level are arranged at different heights on the outside of the container wall.
  • the sensors 21, 22, 23 and 24 are connected to the control device 18. Compared to the one from the Fig.
  • the pump 14 is switched off, a liquid level in the container 16 rises.
  • the measurement of the rise time of the liquid level in the container 16 is started in the control device 18 with the time measuring device 19.
  • the feed rate can be determined as the feed volume per unit time.
  • the centrifugal pump 14 is switched on by the control device 18. The pumping process causes a drop in the liquid level in the container 16.
  • the control device 18 selects the switch-off level of the pump from the various switching levels as a function of the inflow quantity. In the case of not so large inflow quantities, the shutdown level will correspond to the liquid level "Pump OFF 1". At high feed rates, a greater safety margin to the container bottom is required so that turbulence and associated air pockets resulting in the container do not lead to an intake of air in the centrifugal pump 14.
  • the control device 18 can use the appropriate sensor 21 or 22 for evaluation depending on the feed amount corresponding to the desired cut-off level and determine a switching condition based on its switching signal, whereupon the centrifugal pump 14 is turned off.
  • the measurement of the feed quantity is effected by a measuring device arranged on the feed pipe 17 and not shown here.
  • a measuring device such as a Ultraschall beflußmess réelle or a magnetic inductive Druchflußmess réelle
  • the feed rate is constantly measurable.
  • the measurement of the feed rate is thus at any time and independently of any possibly taking place Abpumpvor réellen the pump 14 feasible. Constant consideration of the feed quantity leads to an even more exact adaptability of the switch-off levels to the currently existing conditions.
  • Fig. 4 shows a further system, which is equipped with an alternative, also according to the invention device.
  • a controller 18 is connected to only one level sensor 25 for detecting the liquid level.
  • the sensor 25 is capable of detecting a plurality of different liquid levels in the sump 16.
  • the sensor 25 thereby enables the detection of all required levels for controlling the centrifugal pump 14.
  • a switch-on level of the pump 14 "pump ON”, several different OFF levels "pump OFF 1", “pump OFF 2", “pump OFF 3" and “Pump OFF 4" and two measurement levels “Measurement END" and "Measurement START" for measuring a rise time of the liquid level in the tank 16.
  • the level sensor 25 consists of a float 26 whose - caused by a change in the liquid level in the container 16 - lifting movement via a rod 27 causes a rotational movement on a shaft 28, and a sensor electronics unit 29, which converts the rotational movement of the shaft 28 into an output signal. This can be done for example by means of a shaft connected to the potentiometer 28.
  • the sensor electronics unit 29 is connected to the control device 18 and provides this - optionally standardized - output signal available.
  • the measured values detected by the level sensor 25 and transmitted to the control device 18 in the form of a sensor output signal are constantly monitored in the control device 18 for overshoots or undershoots of specific, predefinable limit values in order to control the required switching on and off actions of the centrifugal pump 14 and to Detect start and stop level of a rise time measurement.
  • the measurement of the rise time of the level in the container 16 is started in the control device 18 with the time measuring device 19.
  • the centrifugal pump 14 is switched on by the control device 18. The pumping process causes then a drop in the liquid level in the reservoir 16.
  • the control device decides depending on the determined feed amount, which is the default off levels “pump OFF 1" to "pump OFF 4" and its reaching or falling below leads to shutdown of the centrifugal pump 14th
  • the solution shown allows a more flexible and finer gradation of switching and / or measurement levels.
  • An increase and / or a lowering of switch-off levels or a determination of measurement levels for measuring the rise time can - as shown here for clarity - done due to several individual concrete liquid levels, but is also infinitely realized with such a level sensor.
  • the control device 18 is in fact able to form arbitrary switching and / or measuring levels with its algorithms. In this case, the limit values of individual and / or all switching or measuring levels are defined in the control device 18.
  • 20 different switching or measuring levels are stored and / or configurable in the controller 18 and its memory device, which are used depending on the system condition.
  • An assignment can be made by means of a stored table, wherein, for example, depending on the feed quantity different alternative turn-off levels are stored in a table.
  • Another determination of the desired switching levels by means of deposited formulas. Particularly easy is a Ausschaltrise as a function of the measured rise time.
  • a polynomial is stored ex works in the control device 18 in the memory device 20, which allows a determination of a switch-off level by means of the stored formula context or polynomial during operation of the device according to the invention.
  • a large measured rise time results in a relatively lower, closer to the container bottom, a small rise time to a relatively higher shutdown level.
  • the realization of a "flood ALARM" is also feasible with the level sensor 25.
  • combinations are provided with sensors with one or more individual switching positions.
  • sensors As a sensor for detecting the liquid level also sensors other measuring principles, such as other floating body sensors, hydrostatic pressure sensors, ultrasonic sensors, optical, capacitive or microwave sensors are. If the centrifugal pump 14 connected to the speed control with a frequency converter, the controller 18 may be integrated in this.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Non-Electrical Variables (AREA)
EP07024706.9A 2007-02-20 2007-12-20 Niveauabhängige Steuerung von Pumpen Active EP1961963B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200731672T SI1961963T1 (sl) 2007-02-20 2007-12-20 Krmiljenje črpalk v odvisnosti od nivoja
PL07024706T PL1961963T3 (pl) 2007-02-20 2007-12-20 Sterowanie pomp zależne do poziomu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007008692A DE102007008692A1 (de) 2007-02-20 2007-02-20 Niveauabhängige Steuerung von Pumpen

Publications (3)

Publication Number Publication Date
EP1961963A2 EP1961963A2 (de) 2008-08-27
EP1961963A3 EP1961963A3 (de) 2010-07-14
EP1961963B1 true EP1961963B1 (de) 2015-04-15

Family

ID=38988362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07024706.9A Active EP1961963B1 (de) 2007-02-20 2007-12-20 Niveauabhängige Steuerung von Pumpen

Country Status (8)

Country Link
EP (1) EP1961963B1 (pl)
DE (1) DE102007008692A1 (pl)
DK (1) DK1961963T3 (pl)
ES (1) ES2542340T3 (pl)
HU (1) HUE025615T2 (pl)
PL (1) PL1961963T3 (pl)
PT (1) PT1961963E (pl)
SI (1) SI1961963T1 (pl)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8956125B2 (en) 2008-02-08 2015-02-17 Multitrode Pty Ltd Method for determining pump flow rate
DE102008063019A1 (de) 2008-12-23 2010-07-01 Ksb Aktiengesellschaft Einrichtung und Verfahren für eine flüssigkeitsführende Anlage
EP2489798A1 (de) * 2011-02-16 2012-08-22 Grundfos Management a/s Abwasserhebeanlage
DE102012211848B4 (de) 2012-07-06 2019-08-01 KSB SE & Co. KGaA Füllstandmessung
DE102015204075A1 (de) 2015-03-06 2016-09-08 Ksb Aktiengesellschaft Kunststoffbehälter mit strömungsführendem Bauteil
DE102016200909A1 (de) 2016-01-22 2017-07-27 Ksb Aktiengesellschaft Entlüftungseinrichtung
DE102016200910A1 (de) 2016-01-22 2017-07-27 Ksb Aktiengesellschaft Anlage
DE102016004458A1 (de) * 2016-04-15 2017-10-19 Wilo Se Kreiselpumpenaggregat und Verfahren zu seiner Betriebseinstellung
EP3475578B1 (en) * 2016-06-27 2024-04-10 Maris Pumps Limited Pump priming system with contactless liquid level sensor
DE102016225921A1 (de) 2016-12-21 2018-06-21 KSB SE & Co. KGaA Abwasserhebeanlage mit Schneidwerk
WO2018157261A1 (en) * 2017-03-03 2018-09-07 Technologies Maid Labs Inc. Volumetric real time flow engine
IT202100014831A1 (it) * 2021-06-08 2022-12-08 Consorzio Di Bonifica Pianura Di Ferrara Metodo per il funzionamento di un impianto di sollevamento delle acque

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
FR2624991B1 (fr) * 1987-12-18 1990-06-01 Amenagement Urbain Rural Procede et installation de regulation de niveau dans un reservoir par pompage a cout energetique variable
FI80933C (fi) 1988-06-08 1990-08-10 Sarlin Ab Oy E Oevervakningsfoerfarande foer avlopps- pumpstation samt oevervakningsanordning foer foerverkligande av foerfarandet.
EP0580558B1 (en) * 1992-07-21 1996-05-15 Ditta Lencioni Carlo Device for the control of elevating pumps in a drainage installation or similar
US5591010A (en) * 1995-01-19 1997-01-07 Milltronics Ltd. Time shift control of wastewater pumping system
DE19913530A1 (de) 1999-03-25 2000-09-28 Ksb Ag Niveauabhängige Steuerung von Pumpen
GB0030205D0 (en) * 2000-12-12 2001-01-24 Pulsar Process Measurement Ltd Pump control method and apparatus
DE10132084A1 (de) 2001-07-05 2003-01-16 Wilo Gmbh Abwasser-Hebeanlage mit tiefer Absaugung
DE102004004401B8 (de) 2004-01-29 2008-11-06 Jung Pumpen Gmbh Verfahren zur Installation und/oder zum Betrieb eines Abwassersammelschachts

Also Published As

Publication number Publication date
SI1961963T1 (sl) 2015-08-31
DE102007008692A1 (de) 2008-08-21
PT1961963E (pt) 2015-08-31
EP1961963A3 (de) 2010-07-14
DK1961963T3 (en) 2015-07-06
EP1961963A2 (de) 2008-08-27
HUE025615T2 (en) 2016-04-28
PL1961963T3 (pl) 2015-10-30
ES2542340T3 (es) 2015-08-04

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