EP2831345B1 - Procédé pour actionner un dispositif de pompage - Google Patents

Procédé pour actionner un dispositif de pompage Download PDF

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Publication number
EP2831345B1
EP2831345B1 EP13719012.0A EP13719012A EP2831345B1 EP 2831345 B1 EP2831345 B1 EP 2831345B1 EP 13719012 A EP13719012 A EP 13719012A EP 2831345 B1 EP2831345 B1 EP 2831345B1
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EP
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Prior art keywords
value
speed
volume flow
rotational speed
soll
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EP13719012.0A
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German (de)
English (en)
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EP2831345A1 (fr
Inventor
Ulrich Diekmann
Olaf Klare
Frank Kleine-Benne
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Wilo SE
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Wilo SE
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    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/22—Adaptations of pumping plants for lifting sewage
    • 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
    • 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
    • F04D15/0236—Lack of liquid level being detected by analysing the parameters of the electric drive, e.g. current or power consumption

Definitions

  • the present invention relates to a method for operating a pump unit, in particular for a lifting system, for conveying a liquid via a pressure line into a collecting line, in which the pump unit generates a target volume flow predetermined from a plurality of predetermined target volume flows on the basis of a physical quantity of the pump set automatically, the size being the current drawn by the pump set and / or a size dependent thereon.
  • the invention relates to a pump unit for a lifting system, which is set up to carry out the method, and a lifting system, the lifting system comprising a collecting container for collecting liquids and a pump unit, by means of which the liquid located in the collecting container via a pressure line into the collecting line is lifted, and at least the highest point of the pressure line is geodetically higher than the collecting container.
  • the invention relates to a wastewater lifting plant for buildings or building sites close to the building for lifting domestic wastewater or rainwater from the collecting tank, the collecting line being a wastewater collecting line.
  • Such sewage lifting plants are known, for example from the DE 10 2005 027 091 A1 and the EP 1 731 684 A1 . They are used to first collect waste water that arises below the so-called backflow level or that cannot be discharged into the sewage system at a downward gradient and then to raise it into the sewage collection line via the so-called backflow loop and to discharge it into the sewage system. The wastewater is then discharged backflow-proof.
  • Such lifting systems are also used in rainwater that accumulates below the backflow level and does not seep away.
  • a sewage lifting plant is installed at the lowest point in the basement of a building or in a pit in the area of the building near the building. It can also be accommodated in a shaft. The waste water and / or rainwater is collected in a collecting tank and pumped out of it into the public sewerage system by means of a conveying device, the geodetic height difference to the backflow loop being overcome.
  • the lifting system works automatically depending on the filling level of the collecting container, whereby a level detection, for example with a float, can activate the system and possibly also deactivate it. This means that the pump unit of the lifting system is only occasionally switched on and operated for a comparatively short period of time, namely until the collection container is emptied to a residual volume that is structurally dependent.
  • Unregulated asynchronous motors are used for the pump units of such lifting systems, which for structural reasons only have a single speed and thus have a certain fixed characteristic curve, which is correspondingly given by the power of the motor and the driven hydraulics.
  • the pump head must be selected according to its output and installed in the system, which delivery head the pump unit must have. A subsequent adjustment of the delivery head of the pump unit to the actual application is not carried out or can not be done due to the lack of adaptability of the unit.
  • the lifting system is therefore operated in practice for safety with high hydraulic power at constant speed to ensure that the wastewater is always pumped into the collecting line. For this reason, they are in today's Wastewater lifting plants often use incorrectly dimensioned pump units. This often leads to cavitating operation of the impeller, valve flaps, disturbing flow noises, unnecessarily high operating costs and / or damage to the system or pressure line and thus to premature failure of the lifting system.
  • pump assemblies are known whose differential pressure is regulated, a desired differential pressure corresponding to a specific delivery head of the pump, which can be specified on the electronic control of the pump.
  • the delivery head is set in these pump units on the basis of the differential pressure, which is determined by means of a differential pressure sensor or a plurality of pressure sensors or arithmetically from other sizes of the pump unit.
  • Pumps of this type are used in closed hydraulic systems, such as in heating or cooling circuits. These pumps cannot be used in wastewater lifting plants because the wastewater collection line, into which the wastewater is to be pumped, is part of an open system and is therefore depressurized.
  • the US patent application US 20070/0183902 A1 describes a pump system consisting of a pump, a pump motor, a controller and a user interface for a swimming pool application, the system for detecting a blockage comparing current operating values with operating values previously stored for normal operation and determining a deviation or exceeding of limit values.
  • the US plant does not disclose the use of this method for a wastewater lifting plant.
  • the European patent application EP 0150068 A2 describes a method and a device for regulating, inter alia, the flow rate Q in centrifugal pumps.
  • the flow rate Q is then set in the context of a conventional PI control, the speed being set as a manipulated variable such that the calculated actual flow rate corresponds to a predetermined desired flow rate.
  • a method for operating a pump unit, in particular for a lifting system, for conveying a liquid via a pressure line into a collecting line in which the pump unit automatically sets a target volume flow given to it from a plurality of predeterminable target volume flows on the basis of a physical quantity of the pump assembly, the size being the electrical current absorbed by the pump assembly and / or a size dependent thereon, and storing a table in the pump assembly is in which a value of the size is assigned to a predefined volume flow for a plurality of discrete speeds, which corresponds to an operating point of the pump unit determined by the corresponding speed and the corresponding target volume flow, the volume flow of the pump unit being set on the basis of this table is set by adjusting the speed so that the size essentially corresponds to a certain value assigned to the predetermined target volume flow.
  • the volume flow is set in the method according to the invention. According to the invention, this is done in a purely controlled manner on the basis of the current consumed by the pump unit and / or a quantity dependent thereon.
  • a variable dependent on the electrical current consumed is, for example, the electrical or mechanical power of the pump unit, the winding temperature or the gradient of the winding temperature.
  • the volume flow in the pump unit is set according to the invention.
  • the operating value of the pump unit can be inferred from the current value of the variable.
  • the electrical current and / or the electrical power consumed is preferred because these variables provide information about the current operating state of the pump unit directly and clearly, without delay and with high precision.
  • the pump unit according to the invention is set up to carry out the method according to the invention.
  • a pump unit comprises a pump unit, a drive unit and a control unit, which can form a unit or can functionally interact.
  • the invention speaks of the fact that the pump unit is set up in a certain way and / or one executes a certain method step, this is related in the corresponding context to one of the three components mentioned, in particular to the control unit.
  • the pump unit is preferably intended for use in a lifting system, but can also be used in any other application in which regulation based on the differential pressure is not possible or at least not expedient.
  • the pump unit sets a predetermined target volume flow irrespective of the total delivery head required at its installation location. If the pump unit is part of a lifting system in which it is to convey liquid from a collecting container via the pressure line into the collecting line, it automatically adjusts its volume flow regardless of the height difference between the collecting container and the highest point of the pressure line.
  • the controlled maintenance of a preset volume flow prevents the pump set from entering impermissible operating areas, in particular from reaching impermissibly high volume flows that could be achieved in uncontrolled or uncontrolled operation, but in particular with a differential pressure-controlled pump. This ensures optimal, safe operation of the pump set and, if necessary, the lifting system.
  • a decisive advantage is that the pump unit adapts itself, ie sets the appropriate speed characteristic for the existing system conditions, so that it is no longer necessary to design the pump unit in a specific application-specific performance range, in particular in the performance range of the lifting system.
  • This also allows a reduction in the variety of variants to be achieved, since a lifting system with a special pump unit no longer has to be offered for each height difference to be overcome.
  • the specialist entrusted with the installation of the wastewater lifting plant accordingly no longer needs to design the plant, in particular the lifting plant, but merely - without knowing the delivery head - to manually set a desired standard volume flow, for example 12 m 3 / h, on the pump unit. which results in an optimal flow rate according to the diameter of the pressure line.
  • the diameter is the specialist at Installation known.
  • the pump unit then keeps the specified volume flow constant during operation. Problems caused by incorrect operating points, such as cavitating operation, valve blows, flow noises and / or premature failure of the system, are thus effectively avoided.
  • the further advantage is that any sensors for measuring the volume flow or the pressure can be dispensed with . Consequently, in the pump unit according to the invention, neither a pressure is measured nor a differential pressure determined for the adjustment of the volume flow. Rather, the volume flow is controlled solely on the basis of the electrical current which is taken up by the pump unit or a quantity dependent thereon, such as the electrical or mechanical power or the temperature in the windings of the electric motor driving the pumps or the temperature gradient. A combination of these variables can also be used to adjust the volume flow.
  • volume flow sensors nor pressure or differential pressure sensors have to be installed in the pump unit.
  • the pump unit according to the invention therefore also has no such sensors or, if they can be present, uses them at most only for information purposes without using their measurement data as part of the volume flow control.
  • the pump unit preferably has means for determining the current value of the size which are connected to the control and which supply the value of the current size.
  • This or these means is preferably formed by at least one sensor, for example a current sensor, a power measuring device, a temperature sensor and / or a device for detecting the mechanical power, in particular the torque, which either measures the value of the corresponding variable directly or calculated.
  • the current consumption can be determined arithmetically from the measured voltage and the absorbed power, and the electrical power in turn from the measured current and the measured voltage.
  • the mechanical performance can be determined, for example, from the measurement of the torque output by the electric motor and the set speed, which the electronic control of the pump unit knows because it sets the speed.
  • the torque can also be calculated from the measured current and / or the measured voltage.
  • the person skilled in the art can preferably specify the volume flow setpoint via an input means on the pump unit, for example via a rotary potentiometer, a pulse generator and / or one or more control buttons.
  • the pump unit can preferably have a control system, to which the target volume flow can then be predefined and which sets the target volume flow accordingly.
  • the input means can then be present on this controller accordingly.
  • the controller can structurally form a unit with the pump unit, in particular with the electronics that control and energize the electric motor of the pump unit. Alternatively, it can be arranged far from the pump unit and connected to it via a control line. In this variant, the control and pump unit functionally belong together.
  • the volume flow rate to be set is predefined in discrete stages for the pump unit or the controller, the stages being able to be so fine that a quasi-continuous target volume flow rate specification is possible.
  • the control of the volume flow based on the current consumption of the pump unit or a variable dependent on the current consumption is based on the knowledge that when a pump is operated at a specific speed, a specific volume flow of a specific current consumption, a specific output and / or a specific temperature or a corresponds to certain temperature gradients in the motor windings.
  • the speed and the value of the variable at this speed define a specific operating point of the unit.
  • the pump unit can automatically set its speed such that the said size of the pump unit essentially corresponds to a certain value of this quantity assigned to the desired volume flow, in particular a current consumption value, a power value or a temperature or Temperature gradient value corresponds.
  • These speed-related values can be stored in the pump unit, in particular in the control.
  • the speed is correspondingly the manipulated variable in the context of the control of the pump unit according to the invention.
  • a table is stored in the pump unit, in particular in the control system, in which a value of the size is assigned to each predeterminable target volume flow for a plurality of discrete rotational speeds, which is an operating point determined by the corresponding speed and the corresponding target volume flow of the pump set.
  • the current volume flow of the pump set can then be set using this table.
  • a value of the size is assigned to each target volume flow at a plurality of discrete speeds, so that a more precise setting of the target volume flow is achieved.
  • the table shows the assignment to a large number of volume flows, preferably including a zero volume flow.
  • each of these volume flows does not have to be an adjustable target volume flow. It is sufficient if a few or every second volume flow in the table is an adjustable target volume flow.
  • a volume flow setpoint can be predefined for the pump unit, this volume flow setpoint is consequently one of a plurality of selectable volume flow setpoints. For this reason, it makes sense to assign a value to the size of each predeterminable volume flow setpoint to a plurality, in particular a plurality of speeds.
  • the table according to the invention can then conceptually include the different, predeterminable volume flows in one dimension, for example in the direction of the rows, and the different speeds in the other dimension, for example in the direction of the columns, with a table element having at each intersection of a row and a column at least one value of size.
  • two physical quantities of the pump unit are used to adjust the volume flow, for example the current consumption and the electrical power
  • two values are assigned to each speed-volume flow pair, namely a current value and a power value.
  • a value of the total delivery head present at this operating point can also be assigned to each speed-volume flow pair in the table.
  • the geodetic delivery head H geo corresponds to the height difference between the pump unit and the highest point of the pressure line. It thus forms the static part of the funding amount.
  • the total delivery head is formed not only of the static part, but also of a dynamic part, which arises from the delivery of the liquid. No fluid flows, the geodetic head equal to the total head.
  • Each value of the said size of the pump assembly, together with the respective speed value, defines a specific operating point of the pump assembly in the HQ diagram.
  • the table according to the invention is stored at the factory in the pump unit, in particular in the control, i.e. saved. For this purpose, the recorded current and / or the value of the quantity dependent on the current is measured for each speed characteristic for each volume flow and is stored in the table. On the basis of this table, the current value of the size and the knowledge of the current pump speed can be used to determine the current volume flow, i.e. the actual volume flow can be closed. It is then possible to set a specific volume flow, in particular the predetermined nominal volume flow, by adjusting the speed of the pump unit such that the size essentially corresponds to a specific value assigned to the predetermined nominal volume flow.
  • the pump unit in particular the control, consequently compares the determined, in particular measured, value of the variable with the value expected at the set speed and increases the speed of the pump unit if this value is lower than the expected, i.e. assigned value.
  • the operation of the pump unit can therefore be divided into at least two operating phases.
  • the first phase corresponds to a run-up phase in which the speed is increased successively until the speed is found at which the value of the variable, in particular the current consumption, corresponds to the value assigned to the desired volume flow. From this speed onwards, the holding phase begins, in which the liquid is conveyed out of the collecting container with the specified volume flow.
  • the run-up phase therefore changes to the holding phase when the correct speed has been found via the value of the variable.
  • steps a, b and c means that in each next loop step the first speed after the speed increase corresponds in terms of program to the value of the second speed and at this speed the current value of the quantity is determined again and with a set volume flow at this second , higher speed value associated value of the size is compared. If the assigned value essentially corresponds to the current value, the desired set volume flow has been reached. Otherwise the value, for example the current consumption, will continue to be too low, so that the speed must be increased again to a third speed or a third speed value. When steps a, b, c are repeated, this third speed value is then regarded as the "first speed value".
  • the current value of the variable is again determined and compared with a value of the variable assigned to the target volume flow at this second, higher speed value.
  • the repetition continues until the value of the quantity, that is to say, for example, the current consumption, is substantially equal to an assigned value, that is to say, for example, is equal to the said current value.
  • an operating point is reached at which the pumped volume flow of the pump unit corresponds to the predetermined target volume flow.
  • the pump set can maintain the set volume flow for each operation, i.e. Each time the device is switched on, use the value comparison described. This means that it searches for the operating point each time at which the desired volume flow is present. This can be done every time over the entire speed range, i.e. the pump set starts at a first speed, which is an absolute minimum speed of the pump set.
  • the absolute minimum speed can be, for example, in the range between 5-200 rpm.
  • This process variant represents a "plug-and-play" solution that is universally suitable for every operating case.
  • the pump unit has a certain intelligence and is particularly self-learning.
  • Various design variants are possible here, which can be used alternatively or cumulatively.
  • a first embodiment variant is based on the knowledge that, regardless of a specific installation situation of the pump unit, in particular in a lifting system, the predetermined target volume flow cannot be achieved at every speed in the lower speed range.
  • a certain minimum speed is required even with a minimum delivery head of 0.1 m, for example. This means that below this minimum speed, no speed can be assigned a value, in particular no current value, because there is no such operating point in the HQ diagram.
  • step a plausible value of the variable is assigned to the set volume flow in the table for the first time.
  • This speed then represents the minimum speed and can be used as the first speed in the method. This has the advantage that speeds are not first reached at which the set volume flow cannot be due to physical reasons.
  • the set volume flow is achieved faster.
  • This query can preferably take place before step a, but at least before step b or step c.
  • a "plausible value” is to be understood as a value that is numerically present in the table, that is to say is not a nan value, and that is neither zero, negative, nor impossible in terms of amount.
  • the speed is immediately increased to the next higher speed, ie the speed index by which this query occurs again. This continues until the condition is no longer met, ie a plausible value is present.
  • the then existing speed can be used in the current operation as the starting speed, ie the first speed, which is set accordingly in the pump unit and at which a first determination of the current value of the size, for example a first current measurement, is made. In principle, this procedure can be carried out each time the pump unit is operated, ie each time it is switched on again.
  • the minimum speed is stored as the start reference value and that this start reference value is used directly as the first speed during one or each subsequent operation of the pump unit.
  • the determined minimum speed can be stored as a start reference value by storing the numerical value of this minimum speed or an index value assigned to it.
  • the pump assembly is self-learning, with knowledge from previous operations optimizing the current operation of the pump assembly.
  • the speed of the pump unit can be stored as the target reference value if the current value of the variable is substantially equal to the variable value assigned to the target volume flow.
  • the pump unit consequently remembers the speed found at which the desired volume flow or the size value assigned to it is present. The next time the pump set is operated, this target reference value can then be approached directly.
  • this variant has the advantage that the set target operating point is the same for each operation, regardless of the media consistency or density of the liquid to be pumped, which can vary considerably, particularly with domestic waste water in a lifting system.
  • the pump unit is therefore also capable of learning in this respect and automatically optimizes its mode of operation.
  • the target reference value when used as the speed to be approached, the operating point that then arises is adjusted. This prevents the operating point from unintentionally and unconsciously deviating significantly from the desired target volume flow, for example as a result of creeping signs of wear or very different media consistency.
  • An adaptation can take place, for example, by using the target reference value as the first rotational speed in the steps a, b and c described above.
  • step c, i in the next operation of the pump unit can be designed such that the speed of the pump unit is reduced to a second speed if the current value of the size is greater than the assigned value and the speed of the pump unit is set to one second speed is increased if the current value of the size is smaller than the said assigned value.
  • Steps a, b and c can then be repeated with the proviso that the value of the first speed corresponds to the value of the second speed, which is then the increased or the reduced speed.
  • the set speed of the pump unit can be maintained , because the desired target volume flow has been reached.
  • the value of the total delivery head H tot (n_i, Q target ) of the pump unit is additionally assigned to each value of the size in the table. It is thus possible to determine the current total delivery head of the pump unit from the current value of the size determined. This can be done by checking at the currently approached speed to which target volume flow the determined current value is assigned to the variable or can best be assigned. Because with the currently set speed, the currently available value of the size, for example the current consumption, and the volume flow that then results, that is The operating point of the pump set and thus the total delivery head are clearly defined.
  • the corresponding associated current value of the size of the pump unit can be stored for the speeds approached, in particular for each speed approached. This means that support points of a curve are recorded depending on the speed. This is characteristic of the course or the change of the operating point depending on the speed. Saving the values has the advantage that they can also be analyzed later, for example by the pump unit itself, if an installer or maintenance technician carries out analyzes on the pump unit or wants to be displayed on the pump unit.
  • the stored values can also be transmitted to an external device, for example a computer, a control and monitoring device or a mobile handheld device, for example via cable or wirelessly using one of the known near-field radio technologies such as infrared, Bluetooth, WLAN or the like. The analyzes and / or evaluations can then be carried out there.
  • the table can be used to determine the geodetic height of the highest point of the pressure line from the current value of the size or from the speed-related stored size values and the speed. This determination can consequently take place instantaneously on the basis of the current value of the size and / or subsequently on the basis of the recorded values. Since the geodetic height of the highest point of the pressure line corresponds to the head according to the HQ diagram, from which a flow begins to flow, i.e. If the volume flow is not equal to zero, the determination can be made, for example, by determining the speed, hereinafter referred to as the corner speed, at which the current value of the variable no longer essentially corresponds to a value for the volume flow 0 stored in the table.
  • the corner speed can thus be determined when the pump unit is started up, so that for each set speed it is checked whether the value corresponds to the value that corresponds to the value at the set speed Volume flow is assigned to zero, ie that should be present at a volume flow of zero. This is the case below the corner speed. If the first speed is set at which the value of the variable no longer corresponds to the value that should be present at zero volume flow, there is no zero volume flow. Rather, the volume flow is greater than or equal to zero. According to the invention, this set speed can now be understood as the basic speed because the system loss curve is very flat in the very low volume flows in the HQ diagram and therefore there is no serious falsification of the geodetic delivery head to be determined.
  • the total delivery head can now be used as the geodetic height of the highest point of the pressure line, which is also stored in the table field, which was determined by comparing the size values, and for which the assigned volume flow is no longer 0 for the first time at the speed reached (corner speed) .
  • Switching off the pump unit in conventional lifting systems is generally level-controlled, ie depending on the level of the liquid in the collecting container. If the level falls below a certain limit, ie a certain level, the pump unit is switched off hard. This can be detected using a float, capacitive sensors or other known level detection methods. According to the invention, it can be provided that the pump unit according to the present invention is switched off at least in a level-controlled manner during a first operation, an operating time T B , T SB of the pump unit being stored. This can then be used in a next operation, as explained below.
  • the pump unit can, after a predetermined period of time, run smoothly, during which the speed is gradually reduced.
  • This has the advantage that pressure surges in the pressure line, which occur when the pump assembly is suddenly switched off as a result of the water column in the pressure line, are avoided, which on the closed backflow preventer located behind the conveying device falls back.
  • the operation of the pump assembly consequently comprises the start-up, holding and said gentle stopping phase.
  • the start of the phase-out phase can be fixed, i.e. after a predefined time from activation of the pump set.
  • the lifting system can thus be switched off at a level if the water level in the collecting container reaches or falls below a certain level, an operating period of the pump unit being stored.
  • This operating time can be, for example, the total operating time from switching on to switching off the pump set, i.e. the duration of the run-up and hold phase. Alternatively, it can be the duration for which the unit runs when the target volume flow is reached, i.e. the duration of the hold phase.
  • the operating time depends on the volume of the collection container, but is usually less than one minute.
  • the pump unit can carry out the smooth running in a subsequent operation after a period of 50-85%, preferably 60% -75% of the stored operating time, during which the speed is gradually reduced.
  • the reduction can be continuous or gradual, and even, e.g. linear, or irregular, e.g. exponential or logarithmic.
  • a gradual, even reduction may be such that the rate of change is less than 200 rpm per second.
  • the run-out would then be at least 12 seconds. Accordingly, the runout should take place 12s before the end of the stored operating time.
  • the pump unit can determine the run-out time based on the speed found at the desired volume flow and accordingly determine the start of the run-out from the previously stored operating time by subtracting the run-out time. Either the gradient of the speed change or the runout time can be specified. According to an advantageous development, the speed of the pump unit does not necessarily have to be reduced to zero before it is switched off.
  • the pump unit can already be switched off when a minimum volume flow Q Aus is reached or undershot.
  • This development is based on the knowledge that below a certain speed there is only such a low volume flow that the backflow preventer behind the pump or the non-return valve is almost closed.
  • Switching off the pump set in this state means that the non-return flap only covers a small closing distance and the water column in the pressure line sags only slightly when closing. The pressure surge and the associated noise emission as well as the mechanical load on the parts when the pump set is switched off are then low.
  • the minimum volume flow can be defined, for example, by the value of the size, that is, for example, by the current consumed, the power and / or the temperature, and additionally or alternatively also by the speed. If, according to a first variant, the minimum volume flow is specified numerically, the current volume flow can be determined from the table from the current value of the size and the set speed, for example, and compared with this minimum volume flow. For the switch-off criterion, it is then only necessary to compare the actual volume flow determined in this way with a predetermined minimum volume flow. When this minimum volume flow is reached or fallen below, the pump unit is then switched off.
  • the switch-off point can only be determined via the size or only via the speed. If the size or the speed reaches a predetermined numerical value, the device is switched off. As already stated, the volume flow in the pump unit is zero below the corner speed. This means that there is a speed slightly above this basic speed at which the minimum volume flow is present. If the corner speed is determined according to the above explanation, then for example the minimum volume flow can be assigned a switch-off speed which is in the range 10% -60% of the corner speed. According to this variant, no fixed numerical value is therefore specified, rather the pump unit itself determines a sensible switch-off speed due to the corner speed. Alternatively, the previously described minimum speed can be selected, ie the speed at which a plausible current value is assigned to the set volume flow for the first time. In relation to the discrete speed levels used, the next or the next speed below this minimum speed can also be used.
  • the current volume flow can thus be determined from the table from the current value of the size and the set speed.
  • the determined volume flow can preferably be integrated over time. This makes it possible to determine the value of the pumped volume flow of the pump unit and, if necessary, to process it further, in particular to evaluate, display and / or forward it. So far, the pumped volume could not be measured using the pump alone. This required the usual measuring technology such as volume flow meter, heat meter or alternative measuring methods. Due to the precise knowledge of the relationships between pump speed, volume flow and the physical quantity, in particular the electrical current, which are stored and stored in a table in the pump control, it is possible to run through and from the on the basis of the operating points approached by the pump unit integrated measurement of the size, in particular the integrated current measurement, and on the basis of the time that the pump unit is working in these operating points, to determine the delivered volume. This eliminates the need for costly volume measurement technology. It is also possible to determine the delivery volume of media that, due to their specificity (e.g. consistency), are difficult to measure using conventional volume measurement technology.
  • a program in the control unit which integrates the curve function of the volume flow, which is determined from the stored table on the basis of the known speed and the known electrical current, via the pump running time and thus determines the volume delivered.
  • a heat quantity count can preferably also be carried out, for example for heating or solar technology.
  • the determined current volume flow, the determined geodetic height of the highest point of the pressure line and / or the determined total delivery head can be shown on a display, in particular of the pump unit.
  • a display in particular of the pump unit.
  • the representation on the display can take the form of a numerical numerical value and / or a graphic.
  • the display can be part of the control, in particular part of the housing of the control electronics of the pump assembly or part of an external control and display device.
  • the operating points of the pump unit that have been run through are determined from the table and a system curve is determined therefrom, which is shown on a display.
  • the display can also be the aforementioned display. This idea is based on the knowledge that the system loss curve is determined by a quadratic mathematical relationship between total head and volume flow. Already two points are sufficient to clearly define this curve, but several operating points can also be appropriate size values are used to determine the system loss curve,
  • a pump unit for conveying a liquid via a pressure line into a collecting line is also proposed, which is set up to carry out the method according to the invention.
  • a set volume flow to be conveyed by it can be predetermined for the pump unit. It is set up in such a way that it automatically adjusts its volume flow according to the specification on the basis of a physical quantity of the pump assembly, the size being the current drawn by the pump assembly or a quantity dependent thereon.
  • a variable dependent on the absorbed electrical current is, for example, the electrical or mechanical output of the pump assembly, the winding temperature or the gradient of the winding temperature.
  • a lifting system with a pump unit of the type described above comprises a collecting container for collecting liquid and the pump unit, by means of which the liquid in the collecting container can be raised via the pressure line into the collecting line, at least the highest point of the pressure line being geodetically higher than the collecting container.
  • the lifting system can be a wastewater lifting system for buildings or building sites close to the building for lifting domestic wastewater or rainwater, in which case the collecting line is a wastewater collecting line.
  • the wastewater lifting plant according to the invention is particularly suitable for buildings and building sites close to the building according to DIN EN 12050 (-1).
  • the pump unit can have a control system, to which the set volume flow can be predetermined and which sets the set volume flow.
  • a table is preferably stored in the controller, in which a value of the size is assigned to the predefinable target volume flow or the predeterminable target volume flows for a plurality of discrete speeds, which corresponds to an operating point of the operating point determined by the corresponding speed and the corresponding target volume flow Pump unit corresponds.
  • the pump unit can furthermore have a frequency converter, for which a certain frequency can be predetermined by the control for setting a certain speed.
  • the pump unit can have a pump and an electronically commutated synchronous motor or an asynchronous motor that drives the pump.
  • the electric motor and pumps form a unit.
  • the electronically commutated synchronous motor has a permanent magnetic rotor. It can also be powered by a frequency converter.
  • the speed of the electric motor and thus the Volume flow of the pump set is set by the frequency of the frequency converter.
  • the controller can specify a specific frequency for the frequency converter in order to set a specific volume flow.
  • the controller can be set up in such a way that it increases the frequency when the current currently consumed is less than the current assigned to the predetermined volume flow according to the control characteristic or according to the table. Furthermore, the controller can be set up in such a way that it reduces the frequency when the current currently consumed is greater than the current value assigned to the predetermined volume flow according to the table.
  • the stored in the controller control characteristic or the deposited table is the balancing of that power consumption, or that of power consumption, which is necessary to obtain the predetermined volume flow, or with presence of said predetermined volume flow setpoint Q SOLL corresponding actual volume flow Q is is present.
  • the frequency of the frequency converter is accordingly the manipulated variable in the context of the control according to the invention.
  • FIG. 1 shows a schematic representation of a sewage lifting plant 1 in a building for transporting domestic sewage 3 into a sewage collecting line 6.
  • the lifting plant 1 comprises a collecting container 2 for collecting domestic Wastewater 3 and a pump unit 4, 7 by means of which the wastewater liquid in the collecting tank 2 can be raised into the collecting line 6 via a substantially vertical pressure line 5.
  • the collecting line 6 is connected to the collecting container 2 via the pressure line 5.
  • the pressure line 5 merges at its upper end into a backflow loop, to which the collecting line 6 connects.
  • the highest point of the pressure line 5 is therefore geodetically higher than the collecting container 2.
  • the pressure line 5 is connected to the pressure port of the pump unit 4, 7. Waste water 3 enters a waste water pipe 11, which opens into the collecting container 2.
  • the pump unit 4, 7 comprises an electric motor 7 and a pump 4 driven by the latter.
  • the electric motor 7 is designed as an electronically commutated synchronous motor with a permanent-magnet rotor.
  • the electric motor 7 is fed by a frequency converter 9, which is part of the motor electronics.
  • the pump unit 4, 7 has an integrated control 8, which can be part of the engine electronics.
  • an external control unit 10 is provided, which is connected to the pump unit 4, 7 via a line and via which the control 8 can be programmed, ie certain target values can be specified and settings can be made.
  • the control unit 10 is also connected to a sensor in the collecting container which measures the fill level.
  • the connection between controller 8 and external control unit 10 can be bidirectional, so that pump unit 4, 7 can also transmit data to external control unit 10.
  • the external control unit has a display on which the current volume flow Q actual , the geodetic height of the backflow loop, the total head and / or the system loss curve can be shown.
  • the pump unit 4, 7, in particular the controller 8, is manually given a desired volume flow Q SOLL to be conveyed by it. If the water level exceeds a certain height, the pump unit 4, 7 is activated and conveys the wastewater 3 through the pressure line 5 into the wastewater collecting line 6, which opens into the public sewage system. According to the invention, it automatically sets the target volume flow Q SOLL based on the electrical current I_activated by it.
  • the pump unit 4, 7 adjusts its speed n such that the current consumption I_actual of the pump unit 4, 7 in Essentially corresponds to a specific current value I (n, Q Soll ) assigned to the nominal volume flow Q SOLL .
  • the current I_act is measured by a current sensor 12 which can be integrated in the motor electronics or can be integrated in a power supply line outside the pump unit, see Figure 2 .
  • a variable dependent on it can also be used, for example the electrical or mechanical power or the winding temperature or the gradient of the winding temperature.
  • the method according to the invention is illustrated purely by way of example with the use of the current consumption of the pump unit as a physical variable.
  • FIG. 2 shows a block diagram of the pump control according to the invention. Shown is the controller 8 integrated in the pump unit 7, 4, which the frequency converter 9, the electric motor 7 and the pump 4 follow in terms of control technology. On the one hand, the control 8 is supplied with the predeterminable or predefined volume flow setpoint Q SOLL . Furthermore, the value of the current I_actual which is currently being picked up by the electric motor 7 and which is measured by the current sensor 12 is fed to it.
  • the controller 8 controls the frequency converter 9. It outputs a pulse width modulated (PWM) signal of a certain frequency f, which controls the electronic switches, for example transistors or thyristors, of the frequency converter. Depending on the frequency f of the pulse width modulated signal, the frequency converter 9 outputs a three-phase alternating voltage u with which the electric motor 7 is fed. The application of this voltage u to the coils of the electric motor leads to a corresponding current flow in these coils and the build-up of an electromagnetic field, as a result of which the electric motor 7 begins to rotate.
  • the output variable and thus the control variable for the pump 4 is consequently the speed of the electric motor 7, depending on which the pump 4 sets a specific volume flow Q.
  • a table is stored in the controller 8 as shown in Figure 3 is shown.
  • the table also stores speed and thus current values for a zero volume flow.
  • the volume flow Q IST of the pump unit 4, 7 is set using this table.
  • the set volume flow Q set at Q 6 is set in the table.
  • a total delivery head H ges of the pump unit 4, 7 is stored for each volume flow speed value, and consequently also for each current value I j, i .
  • FIG. 4 shows a characteristic field in the HQ diagram of the lifting system 1 according to the invention.
  • 21 exemplary speed characteristics are shown, on which the speed n 1 to n 21 is constant in each case.
  • FIG 4 the operating points H, Q individually approached by the pump unit 4, 7.
  • the arrow shows the path of the operating points.
  • the pump assembly 4, 7 is operated at a first speed n_1 starting from point 0, 0.
  • n_1 is identical to that in Figure 4 index notation used n 1 .
  • This speed n_1 represents an absolute minimum speed of the pump unit 4, 7. At this speed n_1 there is a delivery head of approximately 1 m, but there is still no volume flow Q_actual.
  • the first speed n_1 is held for a short time, so that the electric current I_act currently picked up by the pump unit 4, 7 is determined can, in particular can be measured. Then this actual current I_actual is compared with the current value stored in the table at the speed n_1 for Q target . With regard to the table in Figure 3 this would be the current value I 6.1 . Depending on this comparison, the speed n_1 of the pump unit 4, 7 is then increased to a second speed n_2 if the current consumption I_act is not substantially equal to the current value I (n_1, Q Soll ). Otherwise the speed n_1 is maintained.
  • the speed n_2 is now the first speed.
  • a speed must only be maintained for as long as the control electronics require for current measurement and comparison. If this is very fast, the speed can be increased almost continuously without noticeable speed levels.
  • the table roughly forms a kind of triangular matrix that only has current values above the diagonal.
  • the current values in the table are determined at the factory for each speed characteristic between the minimum and maximum characteristics, ie for each operating point defined by the volume flow Q and the speed n, and are stored in the table.
  • the current values can be averaged, in particular effective current values. At this point it should be noted that current values between two discrete speeds can also be interpolated.
  • the stored current values form support points. The interpolation values help to set the target volume flow Q target more precisely. It is then advisable not only to query whether the current consumption corresponds to a certain stored value, but to determine whether the current consumption is greater or less than this value.
  • Speed assigned current value can be reduced according to the invention to an intermediate speed between the set and the last speed and the current consumption then present can be compared with a current value interpolated from the current values of the set and the last speed. The current consumption should then essentially correspond to this current value.
  • the pump 4 of the pump unit 4, 7 has in the embodiment variant according to Figures 5a , 5b a radial impeller or diagonal impeller. These have the effect that the current increases both with increasing speed and with increasing volume flow.
  • the above-mentioned current comparison can therefore be used to check whether the current consumption at the corresponding speed is less than or equal to the current value which is assigned to the volume flow at this speed. If it is smaller, the speed is increased. If the pump of the pump unit has an axial or semi-axial impeller, the current also increases with increasing speed, but the current falls with increasing volume flow.
  • the current consumption here is approximately 1.45 A. This value is compared with the current value I (n_2, Q soll ) at Q soll . Since this also does not exist or there is no match, the speed is increased further. This is constantly being repeated.
  • n_7 960 rpm
  • a plausible current value I (n_7, Q target ) is available for the first time.
  • the absorbed current is approximately 1.88 A and corresponds to a volume flow Q of approximately 3 m 3 / h according to the table. This agrees with the intersection of the speed curve for n_7 and the system loss curve in Fig. 4 match. From the table according to Fig. 5a and 5b the current volume flow rate Q ist can be determined. Since n_7 the actual power consumption with 1,88A less to than the expected current value at Q in the amount of 2.42 A, the current comparison results in a match also here and the speed is further increased.
  • a counting variable i which corresponds to the later speed index, is set to zero, block 21.
  • this counting variable is increased by one and the first speed n_1 is set in the pump unit 4, 7.
  • the electrical current consumption I_actual of the pump unit is then measured, step 23, and compared with the current value I (n_1, Q_setpoint), which corresponds to the set target volume flow Q target at the first speed n_1 according to the table, step 24.
  • the desired volume flow Q Soll is obviously promoted with the set speed, shown in block 25.
  • negative current values can, for example, contain -1.
  • a simple If query can be used to determine whether a current value at Q target is present at the set speed n_i. If not, the counter variable i is increased by one.
  • the speed with index 7 there is only a plausible current value at the speed with index 7. This is also taking into account the Figure 4 , from which it becomes clear that at least this speed would have to be set in order to achieve a volume flow of 12 m 3 / h at a delivery head of 0 m.
  • This minimum speed n_7 is then used as the first speed and set in the pump unit 4, 7, see step 28.
  • the minimum speed n_7 is stored in the form of its index value as the start reference value i_m1, see step 29.
  • this start reference value can be used directly as the first speed, as shown in FIG Figure 6c is shown, step 30.
  • the start reference value n_m1 is only shown in FIG Fig. 6c reduced by one, then increased again in the next step 22.
  • the start reference value i_m1 is saved and used when the pump set is started gently.
  • the current comparison comprises a step 34, according to which the set first speed n_i of the pump unit 4, 7 is reduced to a second speed n_i-1 if the current consumption I_act is greater than the current value I (n_i, Q Soll ), see step 33 , and a second step 22, according to which the speed n_i of the pump unit 4, 7 is increased to a second speed n_i + 1 if the current consumption I_act is less than said current value I (n_i, Q Soll ).
  • This follows from the failure to meet the two conditions in steps 24 and 33 of FIG Figure 6d . Checking in both directions has the advantage that the repeatable accessibility of the desired operating point is guaranteed against creeping displacement.
  • the measured actual current value I is connected via this current setpoint value, this is an indication that the current delivered volume flow Q is higher than the volume flow setpoint Q SOLL.
  • the speed n of the electric motor 7 is therefore reduced, so that the volume flow decreases accordingly. This is done by reducing the frequency f. Due to the reduced frequency, less current is consumed by the electric motor 7 and the speed n is reduced. As a result, the volume flow Q also drops.
  • the measured actual current value I is available under the current target value, this is an indication that the current delivered volume flow Q is smaller than the volume flow setpoint Q SOLL.
  • the speed n of the electric motor 7 is therefore increased, so that the volume flow Q increases accordingly. This is done by increasing the frequency f. Due to the increased frequency, more current is absorbed by the electric motor 7 and the speed n increases. Consequently, the volume flow Q.
  • the current I_act is measured again and compared. If it then agrees with the stored current value at Q target at the set speed, the desired target volume flow Q target is found, block 25. This speed is then maintained and the process is terminated in terms of control technology, block 26.
  • the associated actual current consumption value I_ist of the pump unit 4, 7 is stored for the speeds n_i, in particular for each speed n_i, so that the course of the operating points can be determined subsequently, as can be seen in FIGS Figures 5a , 5b is indicated by the arrow.
  • the current consumption at speed n1 is 1.41 A, which essentially corresponds to the table value 1.4 A.
  • speed n2 for example, there is a current of 1.445 A, which essentially corresponds to the value 1.45 A.
  • the assignment for the other values takes place in a corresponding manner.
  • the geodetic height of the highest point of the pressure line 5 is then determined as follows from these speed-related actual current consumption values I_actual.
  • the measured current consumption for the first five speed values corresponds to a volume flow of 0 m 3 / h. Only from the speed n_6 is there a current value which is no longer assigned to a current value at zero volume flow, ie which is assigned to a volume flow Q greater than zero.
  • the point at which the volume flow is greater than zero for the first time is between n5 and n6 (corner speed).
  • the head at this point corresponds to the geodetic head.
  • the speed n6 can be assumed as the corner speed because the system loss curve at low volume flows is flat. At this operating point, the total delivery head corresponds almost exactly to the geodetic delivery head due to the still low volume flow and thus a low flow loss.
  • the total head for each pair of values of speed / volume flow can be stored in Tables 5a and 5b.
  • the geodetic delivery head can be determined from the table. This corresponds to the total delivery head assigned to the corner speed at zero volume flow. The corner speed can be determined more precisely, the smaller the distance between the speed levels.
  • the table for a specific current consumption value I_actual and a specific speed, the currently conveyed volume flow Q_actual, the geodetic height of the highest point of the pressure line 5 and the current total delivery head on a display of the controller 8 and / or external control unit 10 is displayed.
  • the operating points run through consisting of volume flow Q and total delivery head H, can also be determined and stored. According to the invention, these operating points that have been run through can be shown on the display and graphically connected, as a result of which the system loss curve of the downstream pressure line is determined and can be displayed.
  • the Figures 7a to 7d show curves of the speed n of the pump unit 4, 7 over time t.
  • the operating time of the pump unit consists of two phases, a run-up phase of the duration T HL and a holding phase of the duration T SB .
  • the method according to the invention is carried out during the startup phase. One speed after the other is therefore set and a check is made as to whether the current consumption corresponds to a stored current value. This is with regard to Figures 4 and 5b the case with n_15.
  • the run-up phase goes into the holding phase.
  • the pump unit 4, 7 is switched off as soon as the water level in the reservoir 2 falls below a certain level.
  • the speed n then drops rapidly to zero.
  • the pump unit 4, 7 executes a gentle coasting, in which the speed n_i is gradually reduced.
  • the run-out takes place for the duration T AL of a run-down phase that directly follows the holding phase.
  • the duration T AL can either be predefined directly or predefined or result from a preset or presettable speed gradient.
  • the speed gradient should be between a predeterminable maximum value and a minimum value. A maximum value should be provided because the physically limited possibility of deceleration of the water column, ie its inertia, which depends on the pipe installation, cannot be exceeded.
  • the run-up takes place starting from the absolute minimum speed of the pump assembly 4, 7, but can also take place from the minimum speed, or can be omitted entirely, so that the target speed is approached immediately.
  • the lifting system 1 is in a first operation, as in the Figures 7a or 7b is shown, switched off at level control when the water level in the collecting container (2) reaches or falls below a certain level.
  • the pump unit 4, 7 then executes the smooth stopping in a subsequent operation after a period of 3/4 of the stored operating time T B , T SB ), during which the speed n_i is gradually reduced.
  • the dashed line shows the speed curve when the pump unit 4, 7 is switched off hard, starting from the target speed n_15.
  • the minimum volume flow Q Off or the switch-off speed n_7 can be specified manually or determined on the basis of the known corner speed mentioned above, for example as 1.1 to 1.5 times this corner speed.
  • the run-down phase is illustrated by an arrow which begins at the intersection of the speed characteristic of the speed n 15 with the system loss curve, ie at the operating point of the holding phase, and ends at the intersection of the speed characteristic of the speed n 7 with the system loss curve.
  • the pump set can run at or after the corner speed has been reached be switched off since there is no longer any volume flow anyway and the closing element of the non-return valve, ie the non-return valve, is closed.
  • the pump unit 4, 7 can set a predetermined volume flow Q SOLL regardless of the height difference between the collecting container 2 and the waste water collecting line 6. It is self-learning and can use knowledge from a company in a subsequent company and thus optimize it.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)

Claims (20)

  1. Procédé d'exploitation d'une unité de pompage, plus particulièrement pour une installation de levage (1), destinée au transport d'un liquide au travers d'une conduite de pression (5) dans un collecteur (6), selon lequel l'unité de pompage (4, 7) règle le flux volumique nominal (QSOLL), de façon autonome parmi plusieurs flux volumiques nominaux prédéfinissables et sur la base d'une grandeur physique (I_ist) de l'unité de pompage (4, 7), sachant que la grandeur (I_ist) est la puissance absorbée par l'unité de pompage (4, 7) (I_ist) et/ou une grandeur dépendant de cette dernière, sachant qu'est enregistré dans l'unité de pompage (4, 7) un tableau contenant, pour chaque flux volumique nominal prédéfinissable (Qsoll), Soll), une valeur (I(n_i, Q)) de la grandeur associée à chaque vitesse de rotation d'une série de vitesses de rotation discrètes (n_i) correspondant à un point de fonctionnement (HIST, QIST) de l'unité de pompage (4, 7) déterminé par la vitesse de rotation correspondante (n_i) et le flux volumique nominal (QSoll), et que le flux volumique (QIST) de l'unité de pompage (4, 7) est réglé au regard de ce tableau, en ce que la vitesse de rotation est réglée de telle façon que la grandeur (I_ist) correspond sensiblement à une valeur définie (I(n_i, QSoll)) associée au flux volumique nominal (QSOLL) prédéfini, caractérisé en ce que le procédé comprend les étapes suivantes :
    a Fonctionnement de l'unité de pompage (4, 7) avec une première vitesse de rotation (n_i),
    b Détermination de la valeur de la grandeur actuelle (I_ist),
    c Comparaison de la valeur (I_ist) et d'une valeur (I(n_i, Qsoll))Soll)) de la grandeur associée au flux volumique nominal (QSoll) pour une première vitesse de rotation (n_i), sachant qu'en fonction de de cette comparaison
    i la vitesse de rotation (n_i) de l'unité de pompage (4, 7) est augmentée à une seconde vitesse de rotation (n_i+1) lorsque la valeur de la grandeur actuelle (I_ist) n'est pas sensiblement égale à la valeur de la grandeur (I(n_i, QSoll)) indiquée et les étapes a, b et c sont répétées jusqu'à ce que la valeur de la première vitesse de rotation (n_i) corresponde à la valeur de la seconde vitesse de rotation (n_i+1) ou
    ii la vitesse de rotation réglée (n_i) de l'unité de pompage (4, 7) est conservée lorsque la valeur de la grandeur actuelle (I_ist) est sensiblement égale à la valeur associée de la grandeur (I(n_i, QSoll)).
  2. Procédé selon la revendication 1, caractérisé en ce que la première vitesse de rotation (n_i) est une vitesse de rotation minimale absolue (n1) de l'unité de pompage (4, 7).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'est tout d'abord déterminée dans le tableau, pour la vitesse de rotation (n_i), la valeur plausible de la grandeur (I(n7, Qsoll))Soll)) associée au flux volumique nominal (QSoll), sachant que cette vitesse de rotation minimale déterminée (n7) est utilisée comme première vitesse de rotation (n_i).
  4. Procédé selon la revendication 3, caractérisé en ce que la vitesse de rotation minimale (n7) est enregistrée comme valeur de référence initiale (i_m1) et reprise comme première vitesse de rotation (n_i) au démarrage suivant de l'unité de pompage (4, 7).
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la vitesse de rotation (n_i) de l'unité de pompage (4, 7) est enregistrée comme valeur de référence cible (i_m2) lorsque la valeur de la grandeur actuelle (I_ist) est sensiblement égale à la valeur de la grandeur (I(n_i, Qsoll))Soll)) associée au flux volumique nominal (QSoll) et qu'elle sert directement de valeur de référence cible au démarrage suivant de l'unité de pompage (4, 7).
  6. Procédé selon les revendications 2 à 5, caractérisé en ce que l'étape c, i est constituée au démarrage suivant de telle façon que la vitesse de rotation (n_i) de l'unité de pompage (4, 7) est réduite à une seconde vitesse de rotation (n_i-1) lorsque la valeur de la grandeur actuelle (I_ist) est supérieure à la valeur associée de la grandeur (I(n_i, QSoll)) indiquée et que la vitesse de rotation (n_i) de l'unité de pompage (4, 7) est augmentée à une seconde vitesse de rotation (n_i+1) lorsque la valeur de la grandeur actuelle (I_ist) est inférieure à la valeur associée de la grandeur (I(n_i, QSoll)) indiquée, sachant qu'à la suite, les étapes a, b et c sont répétée jusqu'à ce que la valeur de la première vitesse de rotation (n_i) corresponde à celle de la seconde vitesse de rotation (n_i-1, n_i+1).
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que, est enregistrée dans le tableau, pour chaque valeur de la grandeur (I(n_i, QSoll)) la valeur associée de la hauteur manométrique totale (Hges(n_i, QSoll)) de l'unité de pompage (4, 7).
  8. Procédé selon la revendication 7, caractérisé en ce que le tableau sert à déterminer la hauteur manométrique totale (Hges(n_i, Qsoll))Soll)) à partir de la valeur de la grandeur actuelle (I(n_i, QSoll)) et de la vitesse de rotation actuelle (n_i).
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que la valeur de la grandeur actuelle (I(n_i, QSoll)) de l'unité de pompage (4, 7) est enregistrée pour les vitesses de rotation utilisées (n_i), en particulier pour chaque vitesse de rotation utilisée (n_i).
  10. Procédé selon l'une des revendications 7 bis 9, caractérisé en ce que, à l'aide du tableau, la hauteur géodésique du point le plus élevé de la conduite de pression (5) est déterminée à partir de la valeur de la grandeur actuelle (I(n_i, QSoll)) ou des valeurs de grandeur (I_ist) enregistrées liées à la vitesse de rotation et de la vitesse de rotation (n_i).
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'unité de pompage (4, 7) après écoulement d'une période prédéfinie exécute un arrêt progressif pendant lequel la vitesse de rotation (n_i) est progressivement réduite.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'unité de pompage (4, 7), tout du moins pour un fonctionnement initial, est arrêtée en fonction du niveau, sachant qu'une durée de fonctionnement (TB, TSB) de l'unité de pompage (4, 7) est enregistrée.
  13. Procédé selon les revendications 11 et 12, caractérisé en ce qu'après écoulement d'une période de 50-85%, de préférence de 60%-75% de la durée de fonctionnement (TB, TSB) enregistrée, l'unité de pompage (4, 7) exécute au cours d'un fonctionnement ultérieur l'arrêt progressif pendant lequel la vitesse de rotation (n_i) est progressivement réduite.
  14. Procédé selon l'une des revendications 11 ou 13, caractérisé en ce que l'unité de pompage (4, 7) est arrêtée lorsque le flux atteint ou passe en dessous d'un flux volumique minimal (QAus).
  15. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'à l'aide du tableau, le flux volumique actuel (Q_ist) est déterminé à partir de la valeur de la grandeur actuelle (I_ist) et de la vitesse de rotation (n_i) réglée.
  16. Procédé selon la revendication 15, caractérisé en ce que le flux volumique (Q_ist) déterminé est intégré en fonction du temps.
  17. Procédé selon l'une des revendications 8, 10, 15 ou 16, caractérisé en ce que sont affichés sur un écran le flux volumique actuel (Q_ist) déterminé, la hauteur géodésique (Hgeo(n_i, QSoll)) déterminée du point le plus élevé de la conduite de pression (5) et/ou la hauteur manométrique totale (Hges(n_i, QSoll)) déterminée.
  18. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'à l'aide du tableau, les points de fonctionnement parcourus (Q, Hges) correspondant de l'unité de pompage sont déterminés à partir d'au moins deux des valeurs de la grandeur (I(n_i, QSoll)) déterminées et enregistrées et des vitesses de rotation (n_i) associées utilisées et sont réunis dans une courbe des pertes de l'installation affichée sur l'écran.
  19. Unité de pompage pour une installation de levage (1) destinée au transport d'un liquide au travers d'une conduite de pression (5) dans un collecteur (6), caractérisé en ce que pour l'unité de pompage (4, 7), un flux volumique nominal (QSOLL) parmi plusieurs flux volumiques nominaux est prédéfinissable, sachant qu'elle est configurée pour exécuter le procédé selon l'une des revendications 1 à 18.
  20. Installation de levage (1) destinée au transport d'un liquide dans un collecteur (6) comprenant un bac collecteur (2) pour recueillir un liquide (3) et une unité de pompage (4, 7) selon la revendication 19 avec laquelle le liquide (3) contenu dans le bac collecteur (2) est remontée au travers d'une conduite de pression (5) dans le collecteur (6), sachant qu'au moins le point le plus élevé de la conduite de pression (5) est géodésiquement plus haut que le bac collecteur (2).
EP13719012.0A 2012-03-30 2013-03-28 Procédé pour actionner un dispositif de pompage Active EP2831345B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012006444A DE102012006444A1 (de) 2012-03-30 2012-03-30 Verfahren zum Betreiben eines Pumpenaggregats
PCT/EP2013/000945 WO2013143702A1 (fr) 2012-03-30 2013-03-28 Procédé pour commander un groupe pompe

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EP2831345A1 EP2831345A1 (fr) 2015-02-04
EP2831345B1 true EP2831345B1 (fr) 2020-06-03

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DE102016109907A1 (de) * 2016-05-27 2017-11-30 Bilfinger Water Technologies Gmbh Verfahren zum Betrieb einer Vakuumpumpe sowie Vakuumpumpenanordnung
DE102019118314A1 (de) * 2019-06-11 2020-12-17 Kessel Ag Abscheidervorrichtung mit sensorisch gesteuerter Dosiervorrichtung
DE102020105670A1 (de) 2020-03-03 2021-09-09 KSB SE & Co. KGaA Druckerhöhungsanlage zur Erhöhung des Versorgungsdrucks in der Wasserversorgung wenigstens einer Entnahmestelle oder eines hydraulischen Verbrauchers
DE102020133760A1 (de) 2020-12-16 2022-06-23 Leistritz Pumpen Gmbh Verfahren zur Förderung eines Fluids durch eine Schraubenspindelpumpe und Schraubenspindelpumpe
CN114320867B (zh) * 2022-03-15 2022-05-24 河北建投水务投资有限公司 一种供水泵组变频调速智能化运行方法及系统
DE102022113913A1 (de) 2022-06-02 2023-12-07 Liebherr-Aerospace Lindenberg Gmbh Vorrichtung und Verfahren zur Zustandsüberwachung einer Elektromotorpumpe

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EP2831345A1 (fr) 2015-02-04
DE102012006444A1 (de) 2013-10-02

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