EP4374078A1 - Verfahren zum betrieb einer mehrpumpenanlage mit dynamischer laufzeitanpassung der pumpen sowie mehrpumpenanlage - Google Patents
Verfahren zum betrieb einer mehrpumpenanlage mit dynamischer laufzeitanpassung der pumpen sowie mehrpumpenanlageInfo
- Publication number
- EP4374078A1 EP4374078A1 EP22747044.0A EP22747044A EP4374078A1 EP 4374078 A1 EP4374078 A1 EP 4374078A1 EP 22747044 A EP22747044 A EP 22747044A EP 4374078 A1 EP4374078 A1 EP 4374078A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- pumps
- operating hours
- age
- active
- 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
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
- F04D15/02—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
-
- 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
- F04D15/0272—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump the condition being wear or a position
Definitions
- the invention relates to a method for operating a multi-pump system comprising two or more pumps, in particular centrifugal pumps, which convey fluid into a common pressure line, with the pumps being operated alternately so that exactly one of the pumps is active or only some of the pumps are active at the same time to pump fluid.
- Multi-pump systems consist of several pumps connected in parallel, which usually pump the fluid into a common pressure line.
- One area of application is heating systems.
- they are often used as double pumps in redundant operation, i.e. only one pump is usually active. If the active pump fails, the remaining pump is switched over to continuously ensure the fluid supply.
- both pumps should be ready for operation.
- the pumps alternate according to a defined cycle. For example, the active pumps can be changed every 24 hours.
- both pumps of the multi-pump system can be operated synchronously, for example to cover peak loads or to exploit an energetically more favorable parallel operation of both pumps.
- pressure boosting systems with several pumps connected in parallel, for example up to six pumps.
- Pressure boosting systems are used in waterworks, for example. Due to the strongly varying demand for flow rate, the number of pumps working synchronously can be flexibly changed during operation. If a pump fails due to a defect, one of the inactive pumps is switched on.
- the object of the present invention is therefore to show an optimized method for the operation of a multi-pump system, by means of which different degrees of wear of the pump can be adapted to one another over the service life of the system.
- each pump is activated at least once with an active duration, while all or at least some of the remaining pumps are inactive. After the active period has expired, the pump is deactivated and another pump in the multi-pump system is put into operation for the active period. According to a preferred embodiment, it is proposed to adapt this active period dynamically, so that at least one of the pumps uses a pump-specific active period. As an alternative or in addition to adjusting the active duration, it is also possible to vary the frequency at which a pump is switched on during a cycle.
- the weighting factor for the at least one pump is increased if its number of operating hours and/or its age is less than the number of operating hours and/or the pump age of at least one other pump in the multi-pump system.
- the average number of operating hours and/or the average age of all pumps can also be used for comparison.
- Increasing the weighting factor extends the active duration by a certain amount, which means that the pump that is younger in comparison or the pump with the fewest operating hours per cycle remains active for longer. In total, the running time of the pump is adjusted to the average over the period of time.
- the average value of the operating hours of all pumps or the average age of all pumps can also be used for the comparison. All in all, this protects the pump with the longest service life or the oldest pump age.
- a minimum difference value between the number of operating hours or the age of the respective pump with the comparison values, ie values of the at least one other pump or the average values, is sensibly required for the adjustment of the weighting factor.
- the invention extends not only to a method for operating a multi-pump system, but also to a multi-pump system as such, in particular best starting from a number of centrifugal pumps.
- the multi-pump system can preferably be designed as a double-pump system. Also conceivable is the design as a pressure boosting system with two or more than two pumps operated in parallel.
- the present invention relates to a controller for a multi-pump system.
- the controller includes at least one communication interface for controlling and communicating with at least two pumps in the system.
- the controller is configured to carry out the method according to the present invention.
- FIG. 1 a block diagram to illustrate the method according to the invention using a multi-pump system according to the invention designed as a double pump,
- Figure 2a a diagram of the operating state of the double pump over time
- Figure 2b a diagram of the operating hours of the double pump over the
- FIG. 2d a diagram representation of the weighting factor k over time.
- FIG. 1 shows a multi-pump system in the form of a double pump 10.
- the individual pumps of the double pump 10 are centrifugal pumps with a common suction and pressure connection.
- Each pump of the double pump 10 is driven by its own motor, which can be connected to its own frequency converter, for example.
- all pumps are identical in construction.
- the motors and frequency converters can be identical in construction, but this is not critical for the idea according to the invention.
- both pumps work cyclically alternately, i. H. each pump is active during a cycle for an active period (e.g. 24 hours) while the other pump is off. After the end of the active period, the pump is switched off and the second pump is put into operation. At the end of the cycle, each of the pumps has run at least once for the Active Duration.
- an initial active duration for example 24 hours, is defined for the pumps.
- This initial active duration is multiplied by a factor k, which is calculated based on the number of hours the pump has been in operation.
- the factor k is always 1 if the difference in the operating hours of both pumps is less than a specific threshold value h. If this threshold value is exceeded, the factor k is set to a value greater than 1 (e.g. 2) increased, but only while the pump is running with the lower number of running hours. If the pump runs with the higher number of operating hours, then k is 1 again. In this way, the pumps steadily converge in their operating hours.
- the difference between the number of operating hours 1 of the first pump and the number of operating hours 2 of the second pump is calculated. This data is transmitted from the pumps via a communication interface to a control unit for calculating the difference.
- the amount 4 is formed from the difference value 3 and in block 5 the threshold value is compared. If the difference 4 is less than or equal to the threshold h, the factor k is set to the value 1; if the difference is above the threshold, the factor is doubled and set to the value 2.
- the dashed line 11 describes the state of the first pump, while the solid line 12 describes the state of the second pump.
- the pump-specific active duration of the first pump 1 is therefore the time during which the first pump or line 11 remains in state 1 throughout.
- the factor k changes to a higher value than 1, namely 2, as shown in Figure 2d, as soon as the difference between the operating hours is above the threshold value h and only the pump with the lower number of operating hours is active, here the first pump (lines 11 and 13 in Figures 2a, 2b).
- the consequence of doubling the factor k is that the active duration of the first pump (pump with the fewer operating hours) is also doubled.
- the difference in operating hours between the two pumps becomes increasingly smaller (see FIG. 2c). The difference is reduced until it falls below the threshold value h. From this point in time, the factor k remains constant at 1, which means that both pumps run with the same active duration.
- the method described above using a double pump as an example can be transferred to pressure boosting systems with up to six pumps.
- one possibility for adjusting the operating hours would be for the pump whose number of operating hours is a threshold value h less than the average operating time of all pumps to be assigned a longer operating time or active duration.
- each pump an individual factor ki, which is multiplied by the initial active time as soon as this pump is running.
- the following rules are observed: if Ti > Tmin, then ki > 1 if Ti ⁇ Tmin, then ki ⁇ 1 .
- the number of operating hours of the pumps in a booster system approaches each other.
- the advantage of the idea according to the invention can be briefly summarized again as follows:
- the pumps in a multi-pump system are usually completely replaced after the entire system has had a certain service life. If there is a pump in this installation that is still relatively new (e.g. it was replaced recently after a defect), this relatively new pump is also discarded.
- this new pump would already have run significantly more, thereby relieving the other older pumps. This in turn reduces the probability of the older pumps failing.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021118743.5A DE102021118743A1 (de) | 2021-07-20 | 2021-07-20 | Verfahren zum Betrieb einer Mehrpumpenanlage mit dynamischer Laufzeitanpassung der Pumpen sowie Mehrpumpenanlage |
| PCT/EP2022/070004 WO2023001735A1 (de) | 2021-07-20 | 2022-07-18 | Verfahren zum betrieb einer mehrpumpenanlage mit dynamischer laufzeitanpassung der pumpen sowie mehrpumpenanlage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4374078A1 true EP4374078A1 (de) | 2024-05-29 |
Family
ID=82694296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22747044.0A Pending EP4374078A1 (de) | 2021-07-20 | 2022-07-18 | Verfahren zum betrieb einer mehrpumpenanlage mit dynamischer laufzeitanpassung der pumpen sowie mehrpumpenanlage |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4374078A1 (de) |
| CN (1) | CN117751246A (de) |
| DE (1) | DE102021118743A1 (de) |
| WO (1) | WO2023001735A1 (de) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58214686A (ja) | 1982-06-09 | 1983-12-13 | Hitachi Ltd | 圧縮機の台数制御装置 |
| DE3937152A1 (de) | 1989-11-08 | 1991-05-16 | Gutehoffnungshuette Man | Verfahren zum optimierten betreiben zweier oder mehrerer kompressoren im parallel- oder reihenbetrieb |
| DE19837100A1 (de) | 1998-08-17 | 2000-03-02 | Kratz Soehne N | System zum Steuern einer Kompressoranlage |
| US6233954B1 (en) | 1999-04-28 | 2001-05-22 | Ingersoll-Rand Company | Method for controlling the operation of a compression system having a plurality of compressors |
| US6516249B1 (en) * | 2000-09-05 | 2003-02-04 | Lockheed Martin Corporation | Fluid control system with autonomously controlled pump |
| DE10234638A1 (de) | 2002-07-29 | 2004-02-19 | Dürr Dental GmbH & Co. KG | Anlage zur Erzeugung von Vakkum oder Druckluft |
| US11732719B2 (en) * | 2017-01-27 | 2023-08-22 | S.A. Armstrong Limited | Dual body variable duty performance optimizing pump unit |
| US11536276B2 (en) * | 2017-03-03 | 2022-12-27 | Technologies Maid Labs Inc. | Volumetric real time flow engine |
| DE102017209992B4 (de) | 2017-06-13 | 2019-05-29 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Verfahren und Vorrichtung zum Steuern einer Druckluftversorgung |
| EP3643922A1 (de) * | 2018-10-25 | 2020-04-29 | ABB Schweiz AG | Energiesparende optimierung für eine pumpanlage |
-
2021
- 2021-07-20 DE DE102021118743.5A patent/DE102021118743A1/de active Pending
-
2022
- 2022-07-18 CN CN202280050432.6A patent/CN117751246A/zh active Pending
- 2022-07-18 EP EP22747044.0A patent/EP4374078A1/de active Pending
- 2022-07-18 WO PCT/EP2022/070004 patent/WO2023001735A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023001735A1 (de) | 2023-01-26 |
| DE102021118743A1 (de) | 2023-01-26 |
| CN117751246A (zh) | 2024-03-22 |
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