EP3369934A1 - Pompe de circulation - Google Patents

Pompe de circulation Download PDF

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Publication number
EP3369934A1
EP3369934A1 EP17159191.0A EP17159191A EP3369934A1 EP 3369934 A1 EP3369934 A1 EP 3369934A1 EP 17159191 A EP17159191 A EP 17159191A EP 3369934 A1 EP3369934 A1 EP 3369934A1
Authority
EP
European Patent Office
Prior art keywords
circulating pump
pump unit
control device
hydraulic
designed
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.)
Pending
Application number
EP17159191.0A
Other languages
German (de)
English (en)
Inventor
Thomas Blad
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.)
Grundfos Holdings AS
Original Assignee
Grundfos Holdings AS
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 Grundfos Holdings AS filed Critical Grundfos Holdings AS
Priority to EP17159191.0A priority Critical patent/EP3369934A1/fr
Priority to US16/490,129 priority patent/US11371509B2/en
Priority to PCT/EP2018/054693 priority patent/WO2018158197A1/fr
Priority to CN201880015575.7A priority patent/CN110392787B/zh
Publication of EP3369934A1 publication Critical patent/EP3369934A1/fr
Pending legal-status Critical Current

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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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more pumps
    • 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
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
    • 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
    • F04D15/0072—Installation or systems with two or more pumps, wherein the flow path through the stages can be changed, e.g. series-parallel
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0245—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0245—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump
    • F04D15/0254—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump the condition being speed or load
    • 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
    • F04D15/0281—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition not otherwise provided for
    • 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 circulation pump unit with an electric drive motor and a control device for speed control of the drive motor and an arrangement of at least two such Ummélzpumpenaggregate and a method for controlling at least two Ummélzpumpenaggregate in a hydraulic circulatory system.
  • a central heat source such as a boiler
  • the heat transfer medium is conveyed into different heating circuits, for example in a heating circuit for underfloor heating and a second heating circuit with normal radiators.
  • At least one circulating pump unit is arranged in each of the heating circuits.
  • a part of the heating circuits namely that through the central heating or cooling source, for example the boiler, passes through a common flow path.
  • the volume flow in this common flow path depends on the delivery rate of several pump units, which makes the regulation or control of the individual circulation pump units difficult.
  • the circulating pump unit according to the invention has, in a known manner, an electric drive motor and an electronic control device for controlling or regulating the drive motor.
  • the control device for speed control of the drive motor is designed such that it controls or regulates the rotational speed of the drive motor according to a control scheme, which is preferably stored in the control device. This means in particular that the control device is designed to adjust the speed of the drive motor according to the control scheme and to vary.
  • the circulating pump unit is, in particular, a centrifugal pump unit with at least one rotation of the drive motor driven impeller.
  • the drive motor may particularly preferably be a wet-running electric drive motor in which a rotor space in which the rotor of the drive motor rotates is separated from a stator space in which the stator windings are arranged by a split tube or a containment shell that the rotor rotates in the liquid to be conveyed.
  • a circulation pump unit can be designed in particular as a heating circulation pump unit, ie, as a circulating pump unit for circulating a liquid heat carrier such as water in a heating or air conditioning system.
  • the control device has a detection module or a detection function, which is designed to detect a state variable representing an operating state from a parallel flow path with a second, preferably similar, circulating pump unit.
  • the state variable to be detected is preferably a hydraulic state variable such as, for example, a flow or preferably a variable representing a hydraulic state.
  • the control device of the circulating pump unit is designed such that it can change the control scheme according to which it controls the electric drive motor of the circulating pump unit on the basis of a state variable detected by the detection function. That is, the circulation pump unit can detect changes of state in another circle or branch of a hydraulic system via the detection function and adjust its own control scheme on the basis of this state variable.
  • hydraulic state changes in one system which are caused by at least one further circulation pump unit in another, parallel branch of the hydraulic system, can be taken into account and compensated in the control, so that misappropriation of the control of the first pump unit due to the startup or speed change of at least one second circulating pump unit can be avoided.
  • the detection function may be arranged to detect a state variable representing a flow caused by a second circulation pump aggregate.
  • the first pump unit can take into account the change in flow in a common flow path or branch of the hydraulic system, which is caused by the at least one second circulating pump unit.
  • pressure losses in the common branch of the system based on a flow change caused by another recirculation pump aggregate can be taken into account to prevent undesired mismatches. It can be prevented, in particular in a heating system, that the control device accidentally detects an increase in the pressure loss as a closing of radiator valves and then reduces the speed or delivery rate of the associated pump unit.
  • the detection function is preferably designed as a software module in the control device of the electric drive motor and further preferably connected to at least one communication interface, via which the state variable can be detected. This can be a communication interface, which can alternatively or additionally be used for further communication functions of the control device.
  • the detection function is designed such that it recognizes a signal representing the switching on and / or off or a speed change of at least one second circulating pump unit as a state variable
  • the control device is preferably such designed such that the drive motor is controllable by the control device taking into account this detected signal. That is, according to this embodiment, the state quantity merely represents the operating state of at least one second circulation pump unit to the extent that it can be determined from the state quantity whether the at least one second circulation pump unit is in operation or not or a speed change occurs.
  • Hydraulic changes of state caused by the operation of the second circulation pump unit can then be detected in another way by the circulation pump unit, for example via sensors present in the circulation pump unit or an evaluation of electrical variables of the drive motor, for example to determine the differential pressure in the circulation pump unit. With a detected change in pressure can then be determined, for example, with the aid of the detected state variable, whether this results from the commissioning of a second circulating pump unit or not. If the state variable signals the startup or speed change of a second circulating pump unit, it can preferably be determined automatically from the change in pressure by the control device of the first circulating pump unit, which flow rate the second circulating pump unit makes or which adaptation of the control scheme is required for compensation.
  • the detection function for detecting a signal in the form of at least one predetermined pattern of one on the Umisselzpumpenaggregat be formed acting hydraulic load.
  • Such functionality makes it possible to transfer the state variable hydraulically in the system, so that separate communication paths for signal transmission, in particular an electrical connection, between several Um Vietnameselzpumpenaggregaten is not required.
  • the circulating pump unit may be designed so that it generates a certain hydraulic pattern in the form of flow or pressure fluctuations when it is put into operation, for. B. is turned on and off several times in succession when switching on. This causes pressure or flow fluctuations in the hydraulic system, which can then be detected by the sensor system of a corresponding similar circulating pump unit as a state variable.
  • the control device of the circulating pump unit based on such pressure or flow fluctuations, which are deliberately caused when switching from a second circulating pump unit, recognize that such a second circulating pump unit has been turned on.
  • the control device has a communication interface, which is connected to the detection function in such a way that the detection function can receive a signal via the communication interface.
  • the communication interface may be an electrical interface or an electromagnetic interface such as a radio interface. Alternatively, other suitable signal transmission paths and associated interfaces, such as an optical interface, may be used. If a plurality of similar circulating pump units with corresponding communication interfaces are used in a hydraulic system, they can communicate with one another via these communication interfaces and exchange the described state variables. The state variables can be transmitted and received as signals via the communication interfaces.
  • the control device preferably has a signal generating device, which is designed to generate the switching on and / or off or a speed change of the drive motor representing signal.
  • a signal generating device which is designed to generate the switching on and / or off or a speed change of the drive motor representing signal.
  • This can either be a signal which is output via a communication interface as described above, or a signal which is transmitted by hydraulic means, as has likewise been described above.
  • the drive motor can be controlled so that it generates a specific hydraulic pattern in the hydraulic circuit system in which the Umisselzpumpenaggregat is used, which in turn can then be detected by the detection device of a second similar Ummélzpumpenaggregates.
  • the recirculation pump unit is adapted to be used together with at least one other similar, more preferably identically designed Ummélzpumpenaggregat in a hydraulic circuit system, each of Umisselzpumpenaggregate is disposed in a branch or circle of the hydraulic circulatory system and these circuits or branches over a common flow path or branch, such as by a boiler lead.
  • the single circulating pump unit can each detect the signal generated by the signal generating means of the other or several other Um Strukturpumpenaggregate as a state variable and then adjust its control scheme.
  • the control device preferably has a communication interface, which with the signal generating device such is connected, that the signal generating means can send out a signal or a value via the communication interface.
  • the signal or the value represents a state variable as described above.
  • the communication interface may, according to the above description, preferably be an electrical or electromagnetic interface for outputting an electrical signal or an electromagnetic signal, such as a radio signal, which may then be detected by a corresponding communication interface of a second circulating pump assembly.
  • the communication interface is designed so that it interacts with both the signal generating device and with the detection function, so that the communication interface is bidirectional, ie can send out signals and correspondingly can detect signals from another circulating pump unit.
  • the communication interface can be designed such that it has a relay function, which makes it possible to forward data received from another communication interface to another communication interface in turn.
  • a relay function which makes it possible to forward data received from another communication interface to another communication interface in turn.
  • the communication interface is designed as a radio interface.
  • the communication interface can simultaneously serve as a relay station, which broadens the radio signals to other communication interfaces. Thus, longer ranges can be bridged.
  • the signal generating device is designed such that it outputs a current flow representing the current flow of Ummélzpumpenaggregates flow rate value via the communication interface. This can then be detected by the communication interface of a second connected circulating pump unit, so that the control device of this second connected circulating pump unit the detected flow rate value as a state variable and adjust its control scheme accordingly based on this detected state variable.
  • the individual circulation pump unit or its control device can take into account the delivery flow value of a second or more further circulating pump units arranged in the same hydraulic system in order to adapt or correct the own control scheme so that it can preferably fulfill its desired function independently of the further circulating pump units.
  • the communication interface to the communication connection with a communication interface of at least one identical, preferably identical second circulating pump unit is particularly preferably designed, and the control device of the circulating pump assembly is designed such that it has at least one second, preferably one, of the communication interface and its detection function identical, circulating pump unit via the communication interface can receive a state variable and that the control device then controls the drive motor of Umisselzpumpenaggregates taking into account the received state of the communication interface state.
  • This can in particular include the adaptation of a control scheme based on the detected state variable.
  • the state variable as described above, may represent switching on or off of the at least one further circulating pump assembly or more preferably being a delivery flow value which represents the current delivery flow of the further circulating pump assembly.
  • control device is designed such that the control scheme according to which the drive motor is controlled has a pump characteristic which depends on one of the detection function detected or received signal, in particular a received state variable, changed and preferably moved.
  • a pump characteristic may, for example, be a proportional pressure or constant pressure characteristic in the QH diagram, in which the pressure is plotted against the flow.
  • the pump unit is regulated according to such a characteristic as a control scheme, an increase in the flow in the common branch of the hydraulic system would lead to a higher pressure drop between the pressure and suction side of the circulating pump unit, which would cause the circulation pump, on the given characteristic under reduction the speed to move into a range of smaller flow rates, which then leads to the fact that in the respective supplied by the circulation pump branch of the pressure provided would be too low.
  • the pump characteristic can be shifted, for example, in the range of higher pressures, and then at constant flow to reach a higher pressure operating point and thus to be able to maintain the pressure in the respective branch despite the higher pressure loss in the common branch.
  • control device if it detects the switching off or reducing the flow rate of another, arranged in a parallel branch Umisselzpumpenaggregates shift the characteristic of their own control scheme in the range of lower pressures, so in turn the flow and the pressure provided in the own branch can be kept substantially constant.
  • the control device is designed such that the pump characteristic of the control scheme is shifted by a correction value, which is a function of a received or detected state variable, in particular the flow in the overall system, in which the Ummélzpumpenaggregat is integrated.
  • the tax filing is designed so that its capture function detects or receives the flow of further circulating pump units in parallel branches and calculates a correction value for shifting the pump characteristic, which is a function of this flow.
  • the correction value may moreover be in proportion to a correction constant representing a hydraulic resistance in a common branch of the hydraulic system. This constant can be determined by the control device of the circulating pump unit in an initialization step or manually entered into the control device, for example, by suitable input means.
  • control device is provided in an initialization function, which can communicate with the control devices parallel Umisselzpumpenaggregate via the described communication interface such that the plurality arranged in parallel branches Umisselzpumpenaggregate selectively switched on and off, to then determine the changes of the hydraulic variables in the system and to calculate the constant from these changes.
  • the control device may be designed such that it automatically changes after receiving a signal or a state variable by their detection function, the control scheme according to which the drive motor is controlled in response to the change of the hydraulic load and in particular a Control scheme forming pump characteristic shifts.
  • the size or strength of the adjustment of the control scheme of the size of the change of the hydraulic load, in particular the flow or the delivery rate of a second Um Georgzpumpenaggregates is made dependent.
  • the hydraulic load or the change of the hydraulic load, which is caused by another circulating pump unit is taken into account in that the hydraulic state in the branch in which the Umisselzpumpenaggregat is arranged, is maintained substantially unchanged.
  • connection or the flow rate of another pump unit in a common branch pressure loss caused by the operating point or the pump characteristic of the own control scheme depends on the change in the pressure loss in the common branch in the Range of higher or lower differential pressures is shifted.
  • the communication interface is particularly preferably designed for communication with a plurality of identical, preferably identical, second circulating pump assemblies, and the control device is preferably designed such that it controls the drive motor taking into account all signals or state variables received by the communication interfaces.
  • the circulation pump unit is designed so that more than two of these Umisselzpumpenaggregate can be arranged in several parallel branches of a hydraulic system and communicate with each other so that each caused by them changes in the hydraulic state in the overall system of the individual Umisselzpumpenaggregaten be taken into account so that each circulation pump unit preferably controls its own drive motor so that the hydraulic conditions in the associated branch, in which the respective Umisselzpumpenaggregat is arranged, can be maintained unaffected by the other Um Georglzpumpenaggregaten.
  • the state changes caused by the other circulating pump units in the hydraulic system are compensated in such a way that the circulating pump unit can maintain the desired differential pressure and / or flow in the associated branch substantially unchanged.
  • the control device of the circulating pump assembly may be designed such that it changes the control scheme at a detected by the detection function predetermined state variable such that the drive motor is turned off.
  • Umisselzpumpenaggregates allows the formation of a priority circuit in a heating system, which makes it possible to turn off the heating circuits of the other heating circuits when heating.
  • a circulating pump unit preferably a circulating pump unit according to the preceding description, may be arranged in a Schuwasserströmungsweg by a heat exchanger for heating domestic water.
  • This circulating pump unit when put into operation, can generate a signal representing a predetermined state variable via a signal generating device, which is transmitted hydraulically to at least one further circulating pump unit via a communication interface and suitable data connections, which signal is used as a signal for this detects that the circulating pump unit, which serves the domestic water heating, has been turned on. Thereafter, the control device, which receives the signal, turn off its associated circulating pump unit or its drive motor.
  • the predetermined signal or the predetermined state variable is coded in such a way that it is at startup an entire system can be assigned to a specific circulating pump unit, so that further Umfrolzpumpenaggregate can clearly recognize on receipt of the signal that the Umisselzpumpenaggregat, which serves the domestic water heating, has been put into operation.
  • the circulating pump unit may moreover preferably have a sensor connection to which a sensor for detecting the hot water requirement, for example a flow sensor, which can be arranged in a service water line, can be connected.
  • the control device of the circulating pump unit can receive this sensor signal and evaluate it in such a way that it automatically switches on the circulating pump unit or its drive motor based on the sensor signal. In this way, the domestic water heating can be controlled autonomously by a circulating pump unit without a higher-level control device for commissioning the circulating pump unit would be required.
  • the invention further provides the arrangement of at least two circulating pump units according to the preceding description, wherein the at least two circulating pump units are arranged in a common hydraulic circulatory system.
  • the hydraulic circulation system is particularly preferably a hydraulic heating system or a hydraulic heating system.
  • the two circulating pump units are arranged in two mutually parallel branches or circles of the circulatory system, said branches or circles open into at least one common flow path or have a common flow path. D. h., The funded by the two circulating pumps through the two branches liquid always flows through the common branch or section.
  • the at least two branches are preferably consumer branches, in each of which at least one consumer, such as a heat exchanger which forms a hydraulic resistance is arranged.
  • Such a heat exchanger can be formed for example by a radiator or a floor heating circuit or even a domestic water heat exchanger.
  • the hydraulic resistors may be located in the individual branches downstream and / or upstream of the circulating pump unit.
  • the Umisselzpumpenaggregate in the parallel branches are similar and in particular identical, as described above.
  • At least the control device of one of the circulating pump units has a signal generating device which outputs a state variable which represents an operating state of this circulating pump assembly.
  • the state variable can, as described above, the switching on and / or off or, for example, the flow rate represent (flow rate).
  • At least the control device of one of the circulating pump units is designed such that it controls the associated drive motor of this circulating pump unit, taking into account the state variable detected by its detection function and output by the other circulating pump unit.
  • This is preferably done in the manner described above.
  • the plurality of Ummélzpumpenaggregate are identical or identical, so that they can mutually consider their influence on the overall system.
  • the invention further provides a method for controlling at least two Umisselzpumpenaggregate arranged in a hydraulic circuit system in parallel branches.
  • the parallel branches as described above, are designed so that they open in a common flow path, which in each case closes a circuit over the branches.
  • a control scheme according to which a first circulating pump unit is controlled is changed taking into account the hydraulic power provided by the second circulating pump unit.
  • the at least two parallel branches of the hydraulic system open into a common flow path.
  • a size of the hydraulic powers provided by the second circulating pump unit is transmitted from the second circulating pump unit to the first circulating pump unit or determined automatically by the first circulating pump unit on the basis of a load change occurring in the first circulating pump unit.
  • the current flow rate can be transmitted or signaled as a flow rate value from one circulating pump unit to the other circulating pump unit.
  • only the switching on or off can be signaled and the other circulating pump unit can automatically recognize how much the pressure loss in the system changes by the startup or switching off the other circulating pump unit. This can be detected by appropriate pressure sensors in the circulating pump unit and / or optionally derived from electrical variables of the drive motor of the individual circulating pump unit.
  • the circulating pump unit is a centrifugal pump unit which can be used as a circulating pump unit, for example in a heating system or air conditioning system for circulating a liquid heat carrier, such as water. It has a pump housing 2 with an inlet 4 and an outlet 6 and at least one impeller 8 rotating in the interior. The impeller 8 is driven in rotation by an electric drive motor 10. Furthermore, a control device 12 is present in the circulating pump unit, which controls or regulates the electric drive motor 10, in particular adjusts and regulates its speed. D. h., Via the control device 12, the speed of the drive motor 10 can be changed to adapt to the hydraulic conditions. In that regard, the circulating pump unit corresponds to the structure known circulating pump units.
  • the control device 12 is designed such that it controls the drive motor 10 according to at least one control scheme, ie, for example, according to a pump curve, as shown in FIG Fig. 3 is shown.
  • a control scheme for example, proportional pressure curves, according to which the pressure increases in proportion to the flow.
  • control diagrams with constant-pressure curves in which the drive motor is regulated in such a way that the pressure remains constant regardless of the flow rate.
  • Fig. 3 shows by way of example three proportional pressure curves I, II and III in a QH diagram, in which the pressure H is plotted against the flow Q.
  • Fig. 3 shows by way of example three proportional pressure curves I, II and III in a QH diagram, in which the pressure H is plotted against the flow Q.
  • system characteristics A, B and C are shown, which represent the pressure loss in the hydraulic circuit depending on the flow Q.
  • an operating point is established at the intersection of the pump characteristic with the system characteristic. If, for example, the circulating pump unit is operated with the pump characteristic I and the hydraulic system in which the circulating pump unit is used has the system characteristic A, the operating point 14 adjusts itself at the intersection of the two characteristic curves.
  • Fig. 2 schematically shows a heating system with three heating circuits or Bankzweigen 16, 18 and 20.
  • each of the heating circuits 16, 18, 20 of the hydraulic system is a Umisselzpumpenaggregat 22a, 22b or 22c arranged and are each one or more consumers 24, such as radiators or grinding a floor heating.
  • the three heating circuits 16, 18, 20 also pass through a common flow path 26 which passes through a heat source 28, such as a boiler.
  • the three heating circuits 16, 18, 20 branch off on the output side of the heat source 28 and run through the circulation pump units 22a, 22b and 22c through the respective consumers 24 of the three heating circuits 16, 18, 20.
  • the output side of the consumer 24 open the three heating circuits in the mouth point 30 back into the common flow path 26.
  • the three heating circuits 16, 18, 20 may for example heat various parts of a building, alternatively, for example, the heating circuit 16, a heating circuit for a Underfloor heating while the heating circuits 18 and 20 represent heating circuits with normal radiators.
  • the flow direction s could also be opposite. Ie.
  • the hydraulic load or resistance formed by the consumers 24 is downstream of the recirculation pump assemblies 22.
  • the consumers 24 would be upstream of the recirculation pump assemblies 22. This could for example be the case when the plurality of heating circuits 16, 18, 20 heat different apartments and the circulating pump units 22 are each part of a home station.
  • system characteristic A represents, for example, a system characteristic curve, if only one of the circulation pumps 22, for example, the circulation pump 22a, is in operation.
  • the heating circuit 18 is put into operation and, for example, in addition, the circulation pump 22b put into operation, the total flow increases through the common flow path 26 and thus the pressure drop across the heat source 28, so that the system then has the system curve B.
  • the circulating pump unit 22a If now the circulating pump unit 22a is operated with the pump characteristic I, the operating point would migrate from the operating point 14 to the operating point 32 on this pump characteristic curve I, which represents the point of intersection between the pump curve I and the system curve B. That is, the circulating pump unit 22 would reduce its speed, the flow and pressure would decrease. This would mean that the heating circuit 16 and the consumer 24 would no longer be adequately supplied, ie the flow through the consumer 24 could not be kept constant.
  • the control device 12 of the circulating pump assembly is designed so that it can change its control scheme in dependence on the operation of further circulating pump units 22 in parallel branches 18, 20 of the hydraulic system.
  • the control device 12, the pump curve I which is used as a control scheme, for example, move so that the circulating pump unit is operated according to the second pump curve II whose intersection with the system curve B forms a new operating point 34, which is at the same flow q 1 as the operating point 14.
  • the flow q 1 can be kept constant by the consumer 24 of the heating circuit 16.
  • the pressure H is increased, so that the higher pressure loss in the common flow path 26 is compensated and also the differential pressure across the consumer 24 can ideally be kept constant.
  • the circulation pump unit 22a increases its speed and thus also electrical power consumption. If the second circulation pump unit 22b is switched off again, the control scheme is changed back to the original pump characteristic I back and the circulation pump unit 22a is operated again with the pump characteristic I at the operating point 14.
  • Umisselzpumpenaggregate 22b and 22c in the heating circuits 18 and 20 takes place in a corresponding manner depending on how many of the other heating circuits 16, 18, 20 are in operation. It should be understood that the Umisselzpumpenaggregate 22a, 22b and 22c need not necessarily be put into operation in this order. Depending on the heat requirement in the individual heating circuits 16, 18, 20, for example, only the circulating pump unit 22c may be in operation and then the circulating pump unit 22a and 22b may be put into operation. Here are any combinations and sequences conceivable.
  • the required compensations can be calculated from the hydraulic variables in the manner described below.
  • the consumers 24 in the heating circuits 16, 18, 20 have the hydraulic resistors R 1 , R 2 and R 3 .
  • the flow caused by the respective Umisselzpumpenaggregaten 22a, 22b and 22c flows s 1 , s 2 and s 3rd
  • the circulation pump unit 22a generates a differential pressure h 1
  • the circulation pump unit 22b a differential pressure h 2
  • the circulation pump unit 22c a differential pressure h 3
  • the heat source 28 forms a hydraulic resistance R 0 .
  • the hydraulic resistances R 0 , R 1 , R 2 and R 3 not only the hydraulic resistance of the consumer or the heat source, but the total hydraulic resistance in the respective branch, which is formed by conduction losses and the like.
  • the hydraulic resistances R 1 , R 2 and R 3 vary depending on the degree of opening of a thermostatic valve in the respective heating circuit 16, 18, 20, for example.
  • each branch has a differential pressure setpoint h *, which over the hydraulic resistance R is reached.
  • the control devices 12 of the circulating pump units 22 are preferably caused, by appropriate communication via the communication interfaces 40 and data connections 38 described below, first to put all circulating pump units 22a, 22b and 22c into operation.
  • the differential pressures h 1 , h 2 , h 3 and the flows s 1 , s 2 and s 3 are respectively determined by the control devices 12 and are preferably exchanged with one another via the data connections 38.
  • the detection of these values can take place by means of suitable sensors in the circulation pump units 22 and / or by calculation on the basis of electrical variables of the drive motor of the respective circulation pump unit 22.
  • the circulation pump assembly 22b can be switched off and it can pressure values h 1, h '2, h 3 and flow rates s' 1, s '2 and s' 3 are determined. From these measurements, the hydraulic resistance R 0 in the common flow path 26 can be determined by solving the following equation systems with two unknowns.
  • R 0 s 1 ' 2 H 1 - s 1 2 H 1 s 1 ' 2 s 1 + s 2 + s 3 2 - s 1 2 s ' 1 + s ' 2 2
  • H 1 R 1 s 1 2 + R 0 s 1 + s 2 + s 3 2
  • H 1 R 1 s 1 ' 2 + R 0 s ' 1 + s ' 2 + s ' 3 2
  • H 2 R 2 s 2 2 + R 0 s 1 + s 2 + s 3 2
  • H ' 2 R 2 s ' 2 + R 0 s ' 1 + s 2 + s ' 3 2
  • H 3 R 3 s 3 2 + R 0 s 1 + s 2 + s 3 2
  • H 3 R 3 s 3 ' 2 + R 0 s ' 1 + s ' 2 + s ' 3 2
  • the hydraulic resistance R 0 can be determined.
  • the hydraulic resistance R 0 has been determined in the common branch 26, later in flow change by switching or speed change of one of the Umisselzpumpenaggregate 22, the change in the flow s in the common flow path 26 for the adjustment of the pump characteristic in each individual Umisselzpumpenaggregat 22 are taken into account.
  • the pump characteristic I, II, III is thereby preferably shifted by a measure or by a correction value which is proportional to the hydraulic resistance R 0 in the common flow path 26 and an increasing function of the sum of the flows, ie the flow s in the common flow path 26 is.
  • the circulating pump assemblies 22a, 22b and 22c may be directly interconnected via data links 38.
  • the data links 38 can be realized as a wired data bus or wirelessly by radio links.
  • the control devices 12 of the circulation pump units 22 have a communication interface 40 for this purpose. This interacts inside the control device 12 with a detection module 42, which provides a detection function.
  • the detection module 42 can be realized as a software module in the control device.
  • the control devices 12 point beyond in each case a signal generating device 44, which according to a first exemplary embodiment can likewise be connected to the communication interface 40, as in FIG Fig. 1 is shown.
  • the communication interface 40 is preferably bidirectional.
  • the signal generating device 44 can also be realized as a software module in the control device 12.
  • the signal generating device 44 During operation of the respective circulating pump unit 22, the signal generating device 44 generates a signal which represents a state variable and is output via the communication interface 40 and the data connection 38 to the further circulating pump units 22.
  • the state variable may merely signal that the respective circulation pump unit 22 is or is off.
  • the state variable may be a delivery flow value, which represents the respective delivery flow of the pump unit 22.
  • the flow rate can either be measured in the circulation pump unit 22 or derived from the control device 12 of electrical quantities.
  • the signal generating means 44 of the circulation pump unit 22b generates, for example, a delivery rate value which indicates the delivery rate of the second circulation pump unit 22b.
  • This delivery rate value is determined via the communication interface 40 and the data connection 38 to the first circulation pump unit 22a.
  • Its control device 12 processes this signal in the detection module 42 in such a way that it now recognizes the change in the system characteristic curve from the system characteristic A to the system curve B and, accordingly, the control scheme of its control device 12 z. B. from the pump characteristic I to the pump characteristic II changed.
  • the circulation pump unit 22c When connecting the third circulating pump unit 22c, this is done in a similar manner by the circulating pump unit 22c conveyed its flow rate value via the data link 38 to the circulation pump unit 22b and the circulation pump unit 22a, so that these two Ummélzpumpenaggregate then change their pump characteristic as a control scheme again accordingly. Conversely, the circulation pump unit 22c also receives the delivery flow values from the circulation pump units 22a and 22b, so that it can adjust its control scheme to the hydraulic condition of the system resulting from the simultaneous operation of the other circulation pump units 22a and 22b directly at startup.
  • the control unit 12 of the first pump unit 22a is informed only of the switching on or operation of the second circulation pump unit 22b, the control unit 12 can automatically detect via the detection module 42 from the change in the electrical variables and optionally directly in the circulating pump unit 22a measured hydraulic variables, such as changes the system characteristic and makes a corresponding adjustment of the pump characteristic. This can be done in the other two Umisselzpumpenaggregaten 22b and 22c in a similar manner.
  • the networking for communication between the circulating pump units 22a, 22b and 22c can also be done in an alternative manner, such as in Fig. 4 is shown.
  • the control unit 46 is connected in each case via individual data links 38 'with the circulating pump units 22. This can be the data connections 38 'turn wired or wireless, for example, as radio links, be formed.
  • the central control unit 46 may be designed such that it assumes the complete function of the control devices 12 in such a way that it presets the respective rotational speed for the drive motor 10 to the circulation pump units 22a, 22b, 22c, for example via a PWM signal input of the circulation pump units 22a. 22b and 22c.
  • control unit 46 can also only take on the function of transmitting the state variables or signals between the circulating pump units 22, as has been described above. This can be useful in particular if the communication interfaces 40 of the control devices 12 are galvanically isolated from the other parts of the control device, so that the communication links 38 'need an external power supply via the control unit 46.
  • the communication between the Umisselzpumpenaggregaten 22a, 22b and 22c is carried out hydraulically. That is, in this embodiment, the circulating pump units 22a, 22b, 22c do not require a communication interface 40.
  • the signal generating means 44 generates a hydraulic signal upon start-up of each circulating pump unit 22 by operating the drive motor 10 according to a predetermined pattern, for example is briefly switched on and off several times before permanent commissioning in a specific pattern.
  • such a hydraulic signal which signals the operation of a pump unit, are generated at regular intervals by the signal generating means 44 so that the Umisselzpumpenaggregate 22 can continuously monitor their detection devices or detection modules 42, whether more Ummélzpumpenaggregate 22 in the same hydraulic system are in operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP17159191.0A 2017-03-03 2017-03-03 Pompe de circulation Pending EP3369934A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP17159191.0A EP3369934A1 (fr) 2017-03-03 2017-03-03 Pompe de circulation
US16/490,129 US11371509B2 (en) 2017-03-03 2018-02-26 Parallel circulation pump coordinating control assembly
PCT/EP2018/054693 WO2018158197A1 (fr) 2017-03-03 2018-02-26 Unité de pompe de circulation
CN201880015575.7A CN110392787B (zh) 2017-03-03 2018-02-26 循环泵机组

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17159191.0A EP3369934A1 (fr) 2017-03-03 2017-03-03 Pompe de circulation

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EP3369934A1 true EP3369934A1 (fr) 2018-09-05

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Country Status (4)

Country Link
US (1) US11371509B2 (fr)
EP (1) EP3369934A1 (fr)
CN (1) CN110392787B (fr)
WO (1) WO2018158197A1 (fr)

Citations (3)

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EP0735273A1 (fr) * 1995-03-28 1996-10-02 WILO GmbH Pompe jumelle avec système de contrÔle principal
WO2009079447A1 (fr) * 2007-12-14 2009-06-25 Itt Manufacturing Enterprises, Inc. Equilibre de couple synchrone dans des systèmes de pompes multiples
JP2015025427A (ja) * 2013-07-26 2015-02-05 株式会社荏原製作所 給水装置

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JPH0737791B2 (ja) * 1988-11-28 1995-04-26 株式会社日立製作所 ポンプの逆流検出装置及び揚水設備のポンプ運転制御装置並びに可変速揚水発電電動装置
CN1128930C (zh) * 1998-04-03 2003-11-26 株式会社荏原制作所 流体机械的诊断系统
US7010393B2 (en) * 2002-06-20 2006-03-07 Compressor Controls Corporation Controlling multiple pumps operating in parallel or series
FI127255B (en) * 2011-11-02 2018-02-15 Abb Technology Oy Procedure and controller for operating a pump system
PL2708825T3 (pl) * 2012-09-12 2017-08-31 Grundfos Holding A/S Sposób sterowania pompą obiegową w instalacji z co najmniej dwoma obwodami cyrkulacyjnymi
CN104619991B (zh) * 2012-09-13 2017-12-22 Abb瑞士股份有限公司 用于操作并行离心泵的装置及方法
WO2014089694A1 (fr) * 2012-12-12 2014-06-19 S. A. Armstrong Limited Système de commande autodidacte et procédé d'optimisation d'une variable d'entrée consommable
EP2871420B1 (fr) * 2013-11-07 2016-09-07 Grundfos Holding A/S Module de pompe de circulation pour un système de chauffage et/ou de refroidissement
NO20150759A1 (en) * 2015-06-11 2016-10-24 Fmc Kongsberg Subsea As Load-sharing in parallel fluid pumps
FR3058479B1 (fr) * 2016-11-08 2018-11-02 Schneider Toshiba Inverter Europe Sas Procede et systeme de commande d'un equipement multi-pompes

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EP0735273A1 (fr) * 1995-03-28 1996-10-02 WILO GmbH Pompe jumelle avec système de contrÔle principal
WO2009079447A1 (fr) * 2007-12-14 2009-06-25 Itt Manufacturing Enterprises, Inc. Equilibre de couple synchrone dans des systèmes de pompes multiples
JP2015025427A (ja) * 2013-07-26 2015-02-05 株式会社荏原製作所 給水装置

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WO2018158197A1 (fr) 2018-09-07
US20200011330A1 (en) 2020-01-09
CN110392787A (zh) 2019-10-29
CN110392787B (zh) 2022-03-25
US11371509B2 (en) 2022-06-28

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