WO2018162547A1 - Verfahren zum betrieb einer umwälzpumpe in zwillingsbauweise - Google Patents
Verfahren zum betrieb einer umwälzpumpe in zwillingsbauweise Download PDFInfo
- Publication number
- WO2018162547A1 WO2018162547A1 PCT/EP2018/055590 EP2018055590W WO2018162547A1 WO 2018162547 A1 WO2018162547 A1 WO 2018162547A1 EP 2018055590 W EP2018055590 W EP 2018055590W WO 2018162547 A1 WO2018162547 A1 WO 2018162547A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pump
- individual
- control
- twin
- pumps
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
-
- 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
- F04D13/00—Pumping installations or systems
- F04D13/12—Combinations of two or more pumps
- F04D13/14—Combinations of two or more pumps the pumps being all of centrifugal type
-
- 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
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0016—Control, e.g. regulation, of pumps, pumping installations or systems by using valves mixing-reversing- or deviation valves
-
- 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
- F04D15/029—Stopping of pumps, or operating valves, on occurrence of unwanted conditions for pumps operating in parallel
Definitions
- the invention relates to a method for operating a circulating pump in twin construction.
- a twin pump or a circulating pump in twin construction consists of at least two separate individual pumps, in particular centrifugal pumps, which are housed in a common housing. The discharge ports of the individual pumps converge to form a common output pressure port of the twin pump.
- this design offers a redundant mode in which the redundant pump takes over if the running pump fails due to a defect (single pump operation).
- both pumps can be operated synchronously in two-pump operation, which under certain conditions allows more energy-efficient operation and increased delivery capacity of both individual pumps.
- a so-called change-over flap is installed at the location of the pressure nozzle at which the individual nozzles of the two pumps converge. In single pump operation, this pressure-related closes the outlet nozzle of the shut down pump. In two-pump operation, the reversing flap should ideally be in the middle, so that the pumped medium of both pumps can flow as freely as possible into the common discharge port.
- the function of the change-over flap is indicated schematically in FIG.
- the left-hand illustration 1 a shows a single-pump operation in which the discharge nozzle of the stationary pump 2 is closed by means of the flap 3, and the representation 1b the two-pump operation with as exact as possible a middle position of the changeover flap 3 again.
- the conventional control of the twin pump is carried out by the system control, in a heating circulation pump by the system control of the heating system.
- both pumps receive a common manipulated variable in the form of the setpoint speed of their drive units.
- both individual pumps deliver the same outlet pressure at the same nominal speed, which then corresponds to the total head of the system.
- both individual pumps deliver a slightly different outlet pressure. Due to the identical directions of rotation of both pumps, for example, only the flow of a pump can be ideally performed.
- the second pump then has a longer flow guidance, in particular with a higher curve portion. Also, manufacturing tolerances can reinforce these differences.
- This deviation of the delivery heights results in that the change-over flap is loaded with different force vectors, whereby the flap is pivoted out of its center position. Under certain circumstances, the flap position becomes unstable, similar to an inverse pendulum. Least deflections of the flap from the center position, which may be caused by turbulence bales, for example, cause the flap to turn over to one side.
- a method for operating a circulating pump in twin construction is proposed.
- the basis for the process is a circulating pump with at least two separate individual pumps whose discharge ports converge to form a common discharge connection.
- twin construction more than two individual pumps can theoretically also interact within the pump. In the following, the simplicity of twin construction or two individual pumps is discussed. However, the embodiments according to the invention also apply without restriction to a design with more than two individual pumps.
- the individual pumps used can each be designed as a centrifugal pump and arranged within a common housing of the circulating pump.
- Each individual pump comprises its own, variable-speed drive unit, preferably in the form of an electric motor.
- at least one arranged in the discharge nozzle pivotable changeover is provided, which allows a change between a single and multiple pump operation.
- Einpumpen the flap is pivoted from its central position, so that a pressure outlet nozzle of a single pump is closed.
- the flap should ideally be in a middle position in which the discharge ports of the individual pumps are open and the opening diameter of the discharge ports of both individual pumps through the flap either not at all or at least influenced in the same way.
- the present invention proposes to generate by means of a regulation for the circulation pump individual control variables for the pump drives the at least two individual pumps of the circulation pumps and to control them accordingly.
- the individual manipulated variables are to be determined in such a way that a reversing flap is stabilized in two-pump operation, preferably in its center position.
- the problematic deviation between the resulting delivery heights is to be regulated to zero at an identical rotational speed of the individual pumps by means of an individual regulation of the individual drives, whereby the flap position can be effectively stabilized.
- a first approach, according to an advantageous embodiment is to drive the individual pumps in a so-called master-slave mode.
- a single pump operated as a slave is regulated to the actual flow rate of a single pump operated as a master.
- a delivery rate regulator can be used for this purpose, to which the actual delivery rate of the master single pump is fed as nominal value and the current delivery rate of the individual pump operated as slave is supplied as the actual value.
- the delivery flow controller Based on the above-mentioned input variables, the delivery flow controller outputs a correction value for the setpoint speed of the pump operated as a slave. Consequently, the operated as a slave pump can be operated with a respect to the master single pump deviating setpoint speed.
- An alternative approach to the master-slave concept is to consider the twin pump as a multivariable system with at least two inputs and outputs.
- the input variables in this example are the respective rotational speeds of the individual pumps, whereas their controlled variables are the individual delivery heights and / or delivery flows of the individual pumps.
- a separate control of the delivery height / flow rates of both individual pumps and thus an individual generation of matching control variables.
- the set speed of a single pump also affects the further single pump.
- the controlled system of the circulating pump can be described with the aid of so-called transmission elements and coupling elements, a transmission element characterizing the influence of the manipulated variable on the associated individual pump and a coupling element describing the influence of the manipulated variable on the further individual pump. Consequently, the hydraulic coupling can lead to interactions between the at least two individual pumps, which under certain circumstances can cause a build-up of interference signals. Possible consequences are increased energy consumption, increased noise, increased wear or even pressure surges within the piping system.
- a decoupling control between the individual pumps is proposed according to a preferred embodiment.
- a suitable variant here is a so-called P-canonical structure.
- decoupling blocks which behave inversely to the above-described coupling blocks, the mutual influence of the individual pumps can be compensated.
- the individual controlled variables can then be stabilized with independent size regulators.
- Each individual pump of the circulation pump can be controlled by means of an independent size controller, this receives the desired delivery height as a target variable and the actual delivery head of the corresponding single pump as a control variable. Based on this, a suitable speed is output.
- the present invention also relates to a control unit, in particular a system controller for a heater, for controlling at least one circulating pump in twin construction according to the inventive method or an advantageous embodiment of the method. Accordingly, the control unit has the same advantages and properties as previously discussed in detail using the method according to the invention. A repetitive description is omitted for this reason.
- the invention also relates to a circulation pump, in particular heating circulation pump, in twin construction.
- the circulating pump is suitable for receiving individual manipulated variables via an external interface for controlling its at least two electric pump drives.
- the present invention relates to a hydraulic system, in particular a heating system, with at least one control unit according to the invention.
- Figure 1 is a sketch to illustrate the flap position in one and two-pump operation
- Figure 2 is a block diagram of a conventional heating system in two-pump operation; a block diagram of a first embodiment of the invention and
- FIG 4 is a block diagram of an alternative embodiment of the invention.
- the individual drives conventional twin pumps are previously controlled with identical setpoint speed, which is determined by a suitable controller depending on the desired conveying height (see Figure 2).
- the approach according to the invention deviates from this practice and instead provides for individual regulation of the individual pumps, as a result of which different manipulated variables, i. Target speeds, depending on the target head of the circulating pump can be generated.
- different manipulated variables i. Target speeds, depending on the target head of the circulating pump can be generated.
- design-related differences in the flow guidance as well as any manufacturing tolerances between the individual pumps of a twin pump can be compensated, so that in the ideal case both can be operated with identical delivery height.
- the changeover flap can be stabilized in its center position.
- two different approaches are available, namely, on the one hand, a control according to the master-slave principle and, on the other hand, a control according to a multi-variable system.
- FIG. 3 shows a corresponding block diagram.
- the system controller 10 regulates the nominal delivery height for the entire system.
- Pump 1 acts in the example shown as a master, while the pump 2 is operated as a slave.
- the setpoint speed generated by the system controller 10 is supplied to the pump 1 (master pump) as a manipulated variable and at the same time the pump 2 for precontrol of this.
- the pump 2 is additionally regulated to the actual flow rate of the pump 1. This is done with the help of the flow control valve 20, the setpoint of the generated flow Q1 of the pump 1 and the actual value of the resulting flow Q2 of the pump 2 is.
- As a control value of the flow controller 20 outputs a speed correction value for the pump 2, the speed of which can then be adapted and optionally deviate from the speed of the pump 1.
- the regulation of the pump 1 ensures that the nominal delivery height of the system is achieved.
- By controlling the pump 2 ensures that identical Flow rates at the outlet port of the pumps 1, 2 are present, whereby the changeover flap is held in the center position.
- the twin pump can be regarded as a multi-variable system 30 with two inputs and two outputs each.
- the input variables are the two speeds m and
- the controlled variables are the delivery heights Hi and H2.
- the block diagram is shown in Figure 4.
- the two rotational speeds m, n2 affect not only the pump driven by the respective rotational speed, but also the adjacent single pump of the twin body.
- the transfer elements Gn and G22 describe the influence of the respective speed m, n2 on the own pump.
- the coupling elements G12 and G21 describe the influence of the speed m on the delivery height H2 or n2 on Hi of the other pump.
- the mathematical description of the system is non-linear.
- decoupling blocks RH, R21, R12, R22 are introduced. These decoupling blocks behave inversely to the coupling blocks G12 and G21 of the controlled system 30. In this way, the cross-couplings cancel each other out and the multivariable system 30 can be described as a system with two independent inputs, each of which can be stabilized independently with a single-action controller 40a, 40b ,
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18710819.6A EP3592978A1 (de) | 2017-03-09 | 2018-03-07 | Verfahren zum betrieb einer umwälzpumpe in zwillingsbauweise |
CN201880016723.7A CN110382871B (zh) | 2017-03-09 | 2018-03-07 | 用于运行双重构造方式的循环泵的方法 |
BR112019018578-0A BR112019018578B1 (pt) | 2017-03-09 | 2018-03-07 | Método para operar uma bomba de circulação, unidade de controle,bomba de circulação e instalação hidráulica |
RU2019131532A RU2760278C2 (ru) | 2017-03-09 | 2018-03-07 | Способ эксплуатации циркуляционного насоса сдвоенной конструкции |
JP2019548736A JP7074763B2 (ja) | 2017-03-09 | 2018-03-07 | ツインポンプ構造にて循環ポンプを操作する方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017203926.4 | 2017-03-09 | ||
DE102017203926.4A DE102017203926A1 (de) | 2017-03-09 | 2017-03-09 | Verfahren zum Betrieb einer Umwälzpumpe in Zwillingsbauweise |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018162547A1 true WO2018162547A1 (de) | 2018-09-13 |
Family
ID=61627084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2018/055590 WO2018162547A1 (de) | 2017-03-09 | 2018-03-07 | Verfahren zum betrieb einer umwälzpumpe in zwillingsbauweise |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP3592978A1 (de) |
JP (1) | JP7074763B2 (de) |
CN (1) | CN110382871B (de) |
DE (1) | DE102017203926A1 (de) |
RU (1) | RU2760278C2 (de) |
WO (1) | WO2018162547A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU501134B1 (de) * | 2021-12-30 | 2023-07-04 | Wilo Se | Verfahren zur Regelung einer Kreiselpumpe |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0735273A1 (de) * | 1995-03-28 | 1996-10-02 | WILO GmbH | Doppelpumpe mit übergeordneter Steuerung |
EP2940309A1 (de) * | 2014-04-30 | 2015-11-04 | Wilo Se | Verfahren zur Regelung eines Pumpensystems und geregeltes Pumpensystem |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002527804A (ja) * | 1998-10-08 | 2002-08-27 | シーメンス アクチエンゲゼルシヤフト | 多くの結合された制御量を有する制御対象を調節するための調節装置 |
EP2229610B1 (de) * | 2007-12-14 | 2019-03-06 | ITT Manufacturing Enterprises LLC | Synchroner drehmomentausgleich in mehrfachpumpensystemen |
EP2354555B2 (de) * | 2010-01-19 | 2019-09-25 | Grundfos Management A/S | Verfahren zur Energieoptimierung von Pumpen |
CN202385039U (zh) * | 2011-12-06 | 2012-08-15 | 华晶精密制造有限公司 | 一种双泵电机智能控制装置 |
CN104024965B (zh) * | 2011-12-16 | 2018-02-13 | 流体处理有限责任公司 | 用于可变速度泵控制的动态线性控制方法和装置 |
US9562534B2 (en) * | 2012-05-04 | 2017-02-07 | Ghsp, Inc. | In-line dual pump and motor with control device |
JP6030384B2 (ja) * | 2012-08-27 | 2016-11-24 | 株式会社荏原製作所 | ポンプ制御装置 |
FR2999663A1 (fr) * | 2012-12-17 | 2014-06-20 | Schneider Toshiba Inverter | Procede de commande pour systeme multipompes |
FR2999664A1 (fr) * | 2012-12-17 | 2014-06-20 | Schneider Toshiba Inverter | Procede de commande pour systeme multipompes mis en œuvre sans capteur |
CN203374459U (zh) * | 2013-06-24 | 2014-01-01 | 天津东丽湖能源科技有限公司 | 双泵联动的控制系统 |
RU2551139C1 (ru) * | 2013-11-21 | 2015-05-20 | Государственное бюджетное образовательное учреждение высшего профессионального образования "Альметьевский государственный нефтяной институт" | Способ автоматизированного управления электроприводом насосной станции |
-
2017
- 2017-03-09 DE DE102017203926.4A patent/DE102017203926A1/de active Pending
-
2018
- 2018-03-07 CN CN201880016723.7A patent/CN110382871B/zh active Active
- 2018-03-07 EP EP18710819.6A patent/EP3592978A1/de active Pending
- 2018-03-07 JP JP2019548736A patent/JP7074763B2/ja active Active
- 2018-03-07 RU RU2019131532A patent/RU2760278C2/ru active
- 2018-03-07 WO PCT/EP2018/055590 patent/WO2018162547A1/de unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0735273A1 (de) * | 1995-03-28 | 1996-10-02 | WILO GmbH | Doppelpumpe mit übergeordneter Steuerung |
EP2940309A1 (de) * | 2014-04-30 | 2015-11-04 | Wilo Se | Verfahren zur Regelung eines Pumpensystems und geregeltes Pumpensystem |
Also Published As
Publication number | Publication date |
---|---|
EP3592978A1 (de) | 2020-01-15 |
JP7074763B2 (ja) | 2022-05-24 |
BR112019018578A2 (pt) | 2020-04-14 |
CN110382871A (zh) | 2019-10-25 |
JP2020510155A (ja) | 2020-04-02 |
RU2019131532A (ru) | 2021-04-10 |
RU2760278C2 (ru) | 2021-11-23 |
CN110382871B (zh) | 2021-11-02 |
DE102017203926A1 (de) | 2018-09-13 |
RU2019131532A3 (de) | 2021-06-11 |
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