EP3477114A1 - Ensemble de machine électrique submersible - Google Patents

Ensemble de machine électrique submersible Download PDF

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Publication number
EP3477114A1
EP3477114A1 EP17198309.1A EP17198309A EP3477114A1 EP 3477114 A1 EP3477114 A1 EP 3477114A1 EP 17198309 A EP17198309 A EP 17198309A EP 3477114 A1 EP3477114 A1 EP 3477114A1
Authority
EP
European Patent Office
Prior art keywords
electric machine
submersible electric
submersible
electric power
communication unit
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.)
Withdrawn
Application number
EP17198309.1A
Other languages
German (de)
English (en)
Inventor
Per HÖRLÉN
Jürgen MÖKANDER
Johan Bratthäll
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.)
Xylem Europe GmbH
Original Assignee
Xylem IP Management SARL
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 Xylem IP Management SARL filed Critical Xylem IP Management SARL
Priority to EP17198309.1A priority Critical patent/EP3477114A1/fr
Publication of EP3477114A1 publication Critical patent/EP3477114A1/fr
Withdrawn legal-status Critical Current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
    • F04D13/0686—Mechanical details of the pump control unit
    • 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
    • F04D13/0693—Details or arrangements of the wiring
    • 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
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
    • 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
    • F04D15/0027—Varying behaviour or the very 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
    • F04D15/0088—Testing machines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch

Definitions

  • the present invention relates generally to the field of submersible electric machine assemblies especially configured for handling liquid, preferably liquid comprising solid matter. Further, the present invention relates specifically to the field of submersible electric machine assemblies especially configured and intended for treatment applications, transport applications and/or dewatering applications, and comprises submersible electric machines such as pumps and mixers.
  • the submersible electric machine assembly comprises a submersible electric machine having an integrated control unit configured for monitoring and controlling the operation of the submersible electric machine, an electric power connector, and an electric power cable interconnecting the electric power connector and the submersible electric machine and comprising at least one power wire for supplying power from the electric power connector to the control unit of the submersible electric machine.
  • Submersible electric machines having an integrated control unit, also known as intelligent drive, which monitors and controls the operation of the submersible electric machine are conventionally powered via an electric power cable.
  • said electric power cable is rigidly connected, i.e. hardwired, to an external control cabinet located between the submersible electric machine and the power mains.
  • the control cabinet is necessary for the operator to be able to control the submersible electric machine by sending control signals from the control cabinet to the submersible electric machine via a power/phase wire/conductor of the electric power cable.
  • the operator is able to turn the submersible electric machine ON and OFF, respectively, at the control cabinet, and conventionally the operator is also able to control at least one of the functions of the electric machine and/or monitoring the operating condition of the electric machine.
  • the control cabinet is more or less stationary. Thereto, the control cabinet must be adapted to serve the specific submersible electric machine, and thereto only personnel having a certificate qualifying them to connect the electric power cable of the electric machine to the control cabinet are allowed to install
  • the operator is usually not able to reach the submersible electric machine during operation in order to control the operation of submersible electric machine or to interact with the submersible electric machine, i.e. in order to change operational mode of the submersible electric machine.
  • the drainage pump is in constant operation, irrespective of water being pumped or not by the drainage pump. Constant operation of the drainage pump may damage the drainage pump and result in excessive energy consumption. If there is no or little inflow of water to the pit/dent housing the drainage pump, the drainage pump will start to heat the water, an operational mode referred to as boiling. During boiling, the elevated temperature in the drainage pump and in the water is especially harmful for the seals, and eventually all water will become evaporated. The combination of high operational speed and snoring accelerates pump wear and significantly shortens the operative life of the drainage pump. Constant operation is good and inevitable when there is a constant inflow of liquid to the pit/dent housing the drainage pump.
  • the drainage pump is operated in an automatic ON/OFF operation, i.e. the pump is stopped when the water level surrounding the pump is low, for instance the drainage pump is stopped when the drainage pump is snoring or is stopped by means of a level sensor.
  • the drainage pump is snoring when a mixture of air and water is sucked into the drainage pump.
  • the drainage pump is stopped to decrease the use of energy when the drainage pump is not able to perform any positive duty, and to spare the pump from additional wear.
  • An external and mobile control unit for controlling the operation of a pump is disclosed in EP2660474 .
  • the operator is able to change between a few predetermined operational modes of the pump and is able to obtain alarms via an operating panel of the control unit.
  • the electric power plug belonging to the pump and located at the end of the electric power cable of the pump is detachably connectable to an electric power socket of the control unit, and an electric power plug of the control unit is detachably connected to the power mains.
  • the control unit is configured not to be part of the pump and the control unit has the obvious drawback that it easily can get lost.
  • the electric power cable of the pump is constituted by three power/phase wires/conductors and a ground/earth wire, wherein the signal transfer between the control unit and the pump is performed via one or more of the phase wires at the same time as power transfer.
  • the present invention aims at obviating the aforementioned disadvantages and failings of previously known submersible electric machine assemblies, and at providing an improved submersible electric machine assembly.
  • a primary object of the present invention is to provide an improved submersible electric machine assembly of the initially defined type that comprises a Human-Machine-Interface (HMI) fixedly connected to the submersible electric machine and at the same time always accessible for the operator. It is another object of the present invention to provide a submersible electric machine assembly, wherein the operator may interact with the control unit of the submersible electric machine in order to control and monitor the operation of the pump.
  • HMI Human-Machine-Interface
  • a submersible electric machine assembly of the initially defined type which is characterized in that the electric power cable comprises at least one communication wire and the electric power connector comprises an operating panel, wherein the operating panel is connected to the control unit of the submersible electric machine via said at least one communication wire.
  • the present invention is based on the insight of using a HMI constituted by an operating panel that is fixedly connected to the electric power connector of the submersible electric machine, whereby the operator can interact by means of two-way communication with the control unit that is integrated into the submersible electric machine.
  • the electric power connector comprises a wireless communication unit operatively connected to a microcontroller unit that is operatively arranged between the operating panel and the communication wire, wherein the wireless communication unit is configured for wireless communication between the microcontroller unit and a remote operator device.
  • the wireless communication unit is configured for wireless communication between the microcontroller unit and a remote operator device.
  • the control unit of the submersible electric machine comprises a master communication unit and the microcontroller unit of the electric power connector comprises a slave communication unit, wherein said master communication unit and said slave communication unit are operatively connected to each other via two communication wires of the electric power cable.
  • said slave communication unit comprises a capacitor, the master communication unit being configured to transfer DC-power charge pulses to said capacitor of the slave communication unit via the two communication wires.
  • the master communication unit and the slave communication unit are configured for two-way data communication via the two communication wires.
  • the present invention relates generally to the field of submersible electric machine assemblies especially configured for handling liquid, preferably liquid comprising solid matter.
  • the present invention relates specifically to the field of submersible drainage/dewatering pumps especially configured for pumping liquid comprising solid matter, such as water comprising sand and stone material.
  • FIG 1 disclosing a schematic embodiment of a submersible electric machine assembly, generally designated 1.
  • the inventive submersible electric machine assembly 1 comprises a submersible electric machine, generally designated 2, an electric power connector, generally designated 3, and an electric power cable, generally designated 4, wherein the electric power cable 4 interconnects the electric power connector 3 and the submersible electric machine 2.
  • the electric power cable 4 is hardwired to the electric power connector 2 and to the submersible electric machine 2, in order to provide a united/aggregated system or assembly.
  • the submersible electric machine 2 is preferably constituted by a pump or a mixer, i.e. machines specifically configured and intended for treatment application, transport applications and/or dewatering applications.
  • the submersible electric machine 2 is constituted by a drainage/dewatering pump.
  • pump will be used as fully equivalent with the generic term submersible electric machine, and it shall be realized that also mixers are concerned, if nothing else is indicated.
  • the submersible electric machine 2 comprises a a drive unit having an electric motor 5 and a drive shaft 6 and comprises a hydraulic unit having an impeller 7 connected to said electric motor 5 via said drive shaft 6.
  • the pump 2 comprises an inlet 8, a pump housing 9 and an outlet 10, wherein an outlet conduit 11 is connected to the outlet 10 of the pump 2.
  • the outlet conduit 11 is releasably connected to the pump 2, and the pump 2 is preferably of centrifugal pump type.
  • the hydraulic unit of the disclosed pump 2 has a pump chamber (not disclosed) arranged in the pump housing 9 and connecting the inlet 8 and the outlet 10.
  • the electrical motor 5 is arranged in a liquid tight part of the pump housing 9, and the drive shaft 6 extends from the electrical motor 5 and into the pump chamber.
  • the impeller 7 is arranged in the pump chamber and is connected to and driven in rotation by the drive shaft 6 during operation of the pump 2, wherein liquid is sucked into said inlet 8 and pumped out of said outlet 10 when the pump 2 is active.
  • the pump housing 9 and the impeller 7, and other essential components, are preferably made of metal, such as aluminum and/or iron/steel.
  • the submersible electric machine 2 comprises an integrated control unit 12, also known as intelligent drive, configured for monitoring and controlling the operation of the submersible electric machine 2, wherein the electric power cable 4 comprises at least one power/phase wire 13 for supplying power from the electric power connector 3 to the control unit 12 of the submersible electric machine 2.
  • the control unit 12, including a Variable Frequency Drive (VFD) of the control unit 12, is located inside a liquid tight part of the pump housing 9 and is operatively connected to the electric motor 5.
  • the submersible electric machine 2 comprises a liquid tight lead-through receiving the electric power cable 4.
  • VFD Variable Frequency Drive
  • the pump 2 is configured to be operated at a variable operational speed [rpm], by means of said control unit 12 that is configured to control the operational speed of the pump 2.
  • the operational speed of the pump 2 is more precisely the rpm of the electrical motor 5 and of the impeller 7, and correspond/relate to a control unit 12 output frequency.
  • the components of the submersible electric machine 2 are usually, directly or indirectly, cold down by means of the liquid/media surrounding the submersible electric machine 2.
  • the submersible electric machine 2 is designed and configured to be able to operate in a submerged configuration/position, i.e. during operation be located entirely under the liquid surface. However, it shall be realized that the submersible electric machine 2 during operation must not be entirely located under the liquid surface but may continuously or occasionally be partly located above the liquid surface.
  • the pump 2 is in the disclosed embodiment located in a basin 14 and is intended to transport/pump liquid comprising solid matter from said basin 14.
  • the basin 14 may be a natural recess/cavity/pit or a prepared recess/cavity/pit.
  • the electric power cable 4 comprises at least one communication wire 15, preferably two communication wires, besides said at least one power wire 13.
  • the electric power connector 3 comprises an operating panel, generally designated 16, wherein the operating panel 16 is connected to the control unit 12 of the submersible electric machine 2 via said at least one communication wire 15 in order to transmit signals and instructions between the control unit 12 and the operating panel 16, i.e. two-way communication.
  • the electric power connector 3 may be constituted by a plug assembly, as in the disclosed embodiment, or may be constituted by a joint assembly, not disclosed embodiment. In both embodiments the electric power connector 3 is hardwired to the terminal end of the electric power cable 4 that is hardwired to the submersible electric machine 2.
  • the electric power connector 3 when realized by a plug assembly, comprises in a conventional way a sleeve 17 surrounding a set of pins 18, some of which are connected to the power/phase wires 13 of the electric power cable 4 inside the electric power connector 3.
  • Such an electric power connector 13 is a so-called male plug and is preferably based on a standardized electric power plug, such as 3P+E, 3P+N+E, 2P+E, etc., for instance a CEE plug.
  • Adapters are available that are arranged to fit the standardized electric power plug and thereto comprises another standardized electric power plug or a local electric power plug, in order for the submersible electric machine assembly 1 to be used at different locations/markets of the world.
  • the adapters may alternatively be arranged to fit the standardized electric power plug and thereto comprise a short cable configured for post-mounting of another standardized electric power plug or a local electric power plug. Said short cable does not comprise any signal wire, unlike the electric power cable 4.
  • the electric power connector 3 of the disclosed embodiment comprises only one cable inlet 19 that is arranged to prevent the electric power cable 4 from being pulled out of the electric power connector 3 and that is arranged to prevent liquid from entering the electric power connector 3.
  • the electric power connector 3 when realized by a joint assembly, comprises a second cable inlet instead of the sleeve 17 and set of pins 18 of the disclosed embodiment.
  • a short cable configured for post-mounting of a standardized electric power plug or a local electric power plug, or a short cable having a standardized electric power plug or a local electric power plug, is arranged at the second cable inlet.
  • the second cable inlet is arranged to prevent the short cable from being pulled out of the electric power connector 3 and is arranged to prevent liquid from entering the electric power connector 3.
  • Said short cable does not comprise any signal wire, unlike the electric power cable 4.
  • the power/phase wires of the short cable are connected to the power/phase wires 13 of the electric power cable 4 inside the electric power connector 3.
  • the electric power connector 3 comprises in both embodiments an intermediate housing 20 wherein the operating panel 16 is attached to said housing 20.
  • the electric power connector 3 comprises a microcontroller unit 21 operatively arranged between the operating panel 16 and the at least one communication wire 15.
  • the electric power connector 3 may comprise a wireless communication unit 22 operatively connected to said microcontroller unit 21 and configured for wireless communication between the microcontroller unit 21 and a remote operator device (not disclosed).
  • the remote operator device may comprise an imaginary operating panel having the same or at least some of the abilities of the operating panel 16 of the electric power connector 3.
  • the remote operator device may be constituted by for instance a mobile phone, a tablet or a computer.
  • control unit 12 of the submersible electric machine 2 comprises a master communication unit 23 and the microcontroller unit 21 of the electric power connector 3 comprises a slave communication unit 24.
  • the master communication unit 23 and said slave communication unit 24 are operatively connected to each other via the two communication wires 15. Signals and instructions are transmitted between the master communication unit 23 and the slave communication unit 24, i.e. two-way communication.
  • the slave communication unit 24 comprises a capacitor, the master communication unit 23 being configured to transfer DC-power charge pulses to said capacitor of the slave communication unit 24 via the two communication wires 15.
  • the electric power connector 3 comprises a power supply unit operatively connected to the slave communication unit 24 of the microcontroller unit 21. Said power supply unit may be constituted by a battery or the like, or may be configured to branch current from one of the power wires 13.
  • the microcontroller unit 21 of the electric power connector 3 comprises a master communication unit and the control unit 12 of the submersible electric machine 2 comprises a slave communication unit, wherein said master communication unit and said slave communication unit are operatively connected to each other via the two communication wires 15.
  • the master communication unit arranged in the microcontroller unit 21 of the electric power connector 3 may comprise a capacitor, the slave communication unit of the control unit 12 being configured to transfer DC-power charge pulses to said capacitor of the master communication unit via the two communication wires 15.
  • the electric power connector 3 comprises a power supply unit operatively connected to the master communication unit of the microcontroller unit 21. Said power supply unit may be constituted by a battery or the like, or may be configured to branch current from one of the power wires 13.
  • the communication between the control unit 12 and the operating panel 16 over the communication wires 15 is executed when no DC-power charge pulse is transmitted over the communication wires 15, and vice versa.
  • the master communication unit 23 and the slave communication unit 24 are configured for two-way data communication via the two communication wires 15, independently of which of the two units that is located in the control unit 12 and in the microcontroller unit 21, respectively.
  • the operating panel 16 of the electric power connector 3 comprises a power supply switch 25, i.e. a main switch for the submersible electric machine 2.
  • the operating panel 16 comprises at least one indicator 26 configured for indicating the condition of the submersible electric machine 2, i.e. a status indicator.
  • the indicator 26 is constituted by three elements which can be individually lit, i.e. indicate that the submersible electric machine 2 is OK, need service or is out of order.
  • the operating panel 16 may also comprise a mode selector switch 27. By means of the mode selector switch 27 the operator may choose between preset operating modes, for instance mode A and mode B in the disclosed embodiment.
  • the submersible electric machine 2 may be configured to be driven in more operating modes.
  • a first mode is constant operation. During this mode the operational speed may be constant or adaptive/varying.
  • a second mode is automatic ON/OFF operation, i.e. the pump 2 is controlled by level sensors to start pumping at a liquid start level and stop pumping at a liquid stop level, or the pump 2 is controlled to stop pumping when the pump 2 is snoring, or the pump 2 is controlled to start at preset time intervals, or a combination thereof. Also in the automatic ON/OFF operation, and when the pump 2 is active, the operational speed may be constant or adaptive/varying. Any level sensor is operatively connected to the control unit 12 of the pump 2.
  • the term "snoring" entails that the drainage pump 2 sucks a mixture of air and liquid into the inlet 8.
  • the step of detecting whether the pump 2 is snoring or not, may be performed using different techniques, independently or in combination with each other.
  • a preferred embodiment to detect snoring is to monitor the power or current consumption of the pump 2 using the control unit 12. If the power or current consumption of the pump 2 starts to widely fluctuate outside a predetermined range and/or decrease below a predetermined threshold, the pump 2 has started to snore and the control unit 12 detects a snoring condition.
  • An alternative embodiment to detect snoring is to monitor the torque of the pump 2 using the control unit 12.
  • the pump 2 If the torque of the pump 2 starts to widely fluctuate outside a predetermined range and/or decrease below a predetermined threshold, the pump 2 has started to snore and the control unit 12 detects a snoring condition.
  • Other alternative embodiments to detect snoring constitute monitoring one or more of sounds, vibrations, pressure at the outlet 10, etc. of the pump 2.
EP17198309.1A 2017-10-25 2017-10-25 Ensemble de machine électrique submersible Withdrawn EP3477114A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17198309.1A EP3477114A1 (fr) 2017-10-25 2017-10-25 Ensemble de machine électrique submersible

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17198309.1A EP3477114A1 (fr) 2017-10-25 2017-10-25 Ensemble de machine électrique submersible

Publications (1)

Publication Number Publication Date
EP3477114A1 true EP3477114A1 (fr) 2019-05-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17198309.1A Withdrawn EP3477114A1 (fr) 2017-10-25 2017-10-25 Ensemble de machine électrique submersible

Country Status (1)

Country Link
EP (1) EP3477114A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900012849A1 (it) * 2019-07-25 2021-01-25 Dab Pumps Spa Elettropompa con accessori personalizzabili
GB2589050A (en) * 2019-06-18 2021-05-26 Jackson Steven A plug

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005171880A (ja) * 2003-12-11 2005-06-30 Shin Meiwa Ind Co Ltd 水中ポンプ装置
US20070154322A1 (en) * 2004-08-26 2007-07-05 Stiles Robert W Jr Pumping system with two way communication
EP2660474A1 (fr) 2012-05-04 2013-11-06 Sulzer Pump Solutions AB Pompe avec contrôle électronique par transmission bidirectionnelle à travers le câble d'alimentation électrique
EP2713191A1 (fr) * 2012-10-01 2014-04-02 Siemens Aktiengesellschaft Ensemble de terminaison de câble sous-marin, connecteur sous-marin et procédé
CN205646300U (zh) * 2016-05-13 2016-10-12 福建省南安市霞美电子设备厂 一种可网络控制的防水电源插头

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005171880A (ja) * 2003-12-11 2005-06-30 Shin Meiwa Ind Co Ltd 水中ポンプ装置
US20070154322A1 (en) * 2004-08-26 2007-07-05 Stiles Robert W Jr Pumping system with two way communication
EP2660474A1 (fr) 2012-05-04 2013-11-06 Sulzer Pump Solutions AB Pompe avec contrôle électronique par transmission bidirectionnelle à travers le câble d'alimentation électrique
EP2713191A1 (fr) * 2012-10-01 2014-04-02 Siemens Aktiengesellschaft Ensemble de terminaison de câble sous-marin, connecteur sous-marin et procédé
CN205646300U (zh) * 2016-05-13 2016-10-12 福建省南安市霞美电子设备厂 一种可网络控制的防水电源插头

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2589050A (en) * 2019-06-18 2021-05-26 Jackson Steven A plug
IT201900012849A1 (it) * 2019-07-25 2021-01-25 Dab Pumps Spa Elettropompa con accessori personalizzabili
EP3770437A1 (fr) * 2019-07-25 2021-01-27 Dab Pumps S.p.A. Pompe électrique comportant des accessoires personnalisables

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