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EP3511573B1 - Kreiselpumpenanordnung mit elektromotor - Google Patents

Kreiselpumpenanordnung mit elektromotor Download PDF

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Publication number
EP3511573B1
EP3511573B1 EP19150747.4A EP19150747A EP3511573B1 EP 3511573 B1 EP3511573 B1 EP 3511573B1 EP 19150747 A EP19150747 A EP 19150747A EP 3511573 B1 EP3511573 B1 EP 3511573B1
Authority
EP
European Patent Office
Prior art keywords
casing
pump assembly
centrifugal pump
box
electric motor
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.)
Active
Application number
EP19150747.4A
Other languages
English (en)
French (fr)
Other versions
EP3511573A1 (de
Inventor
Francesco Sinico
Enrico Trentin
Michele Cappocchin
Giuseppe Di Giovanni
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.)
DAB Pumps SpA
Original Assignee
DAB Pumps SpA
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 DAB Pumps SpA filed Critical DAB Pumps SpA
Publication of EP3511573A1 publication Critical patent/EP3511573A1/de
Application granted granted Critical
Publication of EP3511573B1 publication Critical patent/EP3511573B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/007—Details, component parts, or accessories especially adapted for liquid 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
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal 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
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor 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
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0626—Details of the can
    • 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
    • F04D13/0606—Canned motor pumps
    • F04D13/064—Details of the magnetic 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
    • 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/406—Casings; Connections of working fluid especially adapted for liquid 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/428—Discharge tongues
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

  • the present invention relates to a centrifugal pump assembly with electric motor.
  • the motor used is normally of the asynchronous type and the motor casing is made of aluminum.
  • An electrical board contained in a box, supplies power and controls the operation of the motor.
  • Aluminum in fact has a good heat dissipation capacity, but it has to be subjected to treatments in order to avoid oxidation, corrosion and wear, such as for example cataphoresis processes.
  • the set of operations adapted to render the aluminum of the motor casing resistant to oxidation, corrosion and wear entails: long production cycles, logistical complexities, linked both to the organization of the spaces for the provision of the various steps and to the spaces for storage between the various steps of the cycle, and considerable costs.
  • DE 10 2013 018317 A1 discloses an electromotive water pump of a motor vehicle, with a wet chamber, which is located inside a housing, and with a dry chamber, in which electronics are arranged.
  • a rotor and a stator and/or an electromagnet are arranged in the wet chamber , the electronics being at least partially in a recess of the housing.
  • EP 0 963 029 A2 discloses a pump having a drive motor with a slotted tube, between the rotor or rotor wheel and the stator.
  • a cylindrical winding carrier carries the stator winding and at least partly encloses the cylindrical part of the tube or pot.
  • EP 2 500 577 A1 discloses a pump having a pump housing comprising a pump impeller driven by an electric wet-running motor, where the motor has a stator that is arranged in a motor housing connected to the pump housing.
  • a terminal box is arranged on the motor housing for electrically connecting the motor winding and for receiving electrical and/or electronic components of a motor control system.
  • the terminal box consists of two components that are connected with one another and made from thermoplastic, where the terminal box is sealed from the motor and from the surrounding environment.
  • a heat distributor made from metal or heat-conducting plastic is arranged at a side of the motor housing.
  • the aim of the present invention is to provide a pump assembly that is capable of improving the background art in one or more of the aspects indicated above.
  • an object of the invention is to provide a pump assembly with a motor casing that does not require subsequent treatments to avoid oxidation, corrosion and wear.
  • Another object of the invention is to provide a pump assembly with a motor casing that is provided according to simpler production cycles and by reducing logistical complexities linked thereto, with respect to pump assemblies of the known type.
  • a further object of the invention is to provide a pump assembly with a motor that produces less heat than those of the known type.
  • Another object of the invention is to provide a pump assembly that allows an effective method of connection between the electronic box and the casing of the motor.
  • an object of the present invention is to overcome the drawbacks of the background art in a manner that is alternative to any existing solutions.
  • a further object of the invention is to provide a pump assembly that is highly reliable, relatively easy to provide and at competitive costs.
  • centrifugal pump assembly with electric motor arranged in a casing, as defined in the appended claims.
  • centrifugal pump assembly with electric motor is designated generally by the reference numeral 10.
  • the centrifugal pump assembly 10 of the invention comprises at one end a wet section 51 which is provided with an intake duct 62 and a delivery duct 63 and a volute 64, and an impeller 52, of a known type, which is immersed in said wet section.
  • the impeller 52 is keyed on a shaft 17 of an electric motor 11 that is composed of a stator 12 and a rotor 18.
  • the electric motor 11 is of the brushless permanent-magnet type.
  • the pump assembly 10 comprises a gap sleeve 53.
  • the gap sleeve is constituted by a tubular body section 55, which has a flanged end 54 which is faced by the impeller 52, and a tubular end 56, in which the cross-section tapers with respect to the cross-section of the body 55 and the diameter is smaller than the diameter of the body 55.
  • the gap sleeve 53 has an axis of extension X, which coincides with the axis of extension of the pump body, which coincides with the axis of rotation of the rotor 18 and of the impeller 52.
  • the axis of extension of the gap sleeve 53 might not coincide with the axis of extension of the pump body.
  • the centrifugal pump assembly 10 of the invention comprises, at the other end, an electrical box 13, which contains an electrical board 14 adapted to control and supply the electric motor.
  • the electric motor 11, and in particular its stator 12, is closed externally by a casing 61.
  • the casing 61 is Z cup-shaped.
  • the base 67 of the casing 61 is proximate to the free tip of the tubular end 56 of the gap sleeve 53.
  • the axis of extension of the casing coincides with the axis of extension X of the pump body.
  • the base 67 is provided with a hole 66 to allow access to the wet section and partially to the stator 12.
  • the base 67 has an opening 68 adapted for the insertion of terminals 25 of the electric motor 11 which are connected to the electric board 14.
  • the casing 61 has one end in contact with the electrical box 13.
  • the casing 61 has, at the end that is opposite to the one for contact with the electrical box 13, a perimetric annular tab 31 which has a plurality of through holes 32 adapted for the insertion of screws 34 for fixing the casing 61 to the body of the volute 64.
  • a particularity of the invention resides in that the casing 61 is made of stainless steel.
  • Stainless steel has a lower heat dissipation capacity than aluminum, but the use of a permanent-magnet brushless motor 11 causes a lower generation of heat than that generated by asynchronous motors and consequently a lower need for heat dissipation.
  • a sealing element 69 is present between the casing 61 and the electrical box 13, is made for example of rubber and is co-molded with the electrical box 13.
  • the casing 61 and the electrical box 13 are connected and rendered integral by the presence of an intermediate element 16.
  • the intermediate element 16 is a connecting and/or covering element and has a tubular shape.
  • the electrical box 13 and the casing 61 for accommodating the stator 12 have mutually complementary contact surfaces.
  • the intermediate element 16 is provided with components which are adapted to be complementary, on one side, with respect to components of the electrical box 13 and, on the other side, with respect to components of the casing 61 for accommodating the stator 12, generating couplings by interlocking with interference.
  • the intermediate element 16 can fix the box 13 to the stator accommodation casing 61 even in a different manner.
  • the intermediate element 16 is provided with seats and/or holes 20 adapted for the insertion of protrusions 21, which are conveniently shaped on the surface that is lateral and parallel to the axis X of rotation of the impeller, of the electrical box 13, generating an interlocking coupling.
  • elements such as for example teeth 22 are present on the intermediate element 16, on the internal tubular surface, and are adapted to generate an interference with elements such as for example projections 23 which are conveniently contoured on the surface of the casing 61 that is lateral, external and parallel to the axis X of rotation of the impeller.
  • elastically deformable elements 70 such as for example leaf springs or flexing springs, three in the illustrated example, which have a substantially rectangular shape.
  • the springs 70 are for example provided by through blanking from the base 67 and are adapted to generate thrust on corresponding pins 71 which are present on the surface 72 of the box 13, which faces the base 67, and are visible in Figures 4b and 5 .
  • the thrust of the elements 70 on the respective pins 71 ensures perfect coupling between the casing 61 and the box 13 This allows to maintain over time contact between the teeth 22 that are present on the internal tubular surface of the intermediate element 16 and the projections 23 of the casing 61.
  • the presence of the elastically deformable elements 70 integrates the thrust produced by the sealing element 69, which being made of plastic is subject to aging and therefore becomes stiffer.
  • One or more first axial pins 28 extend from the electrical box 13 and are adapted to be inserted in corresponding through holes 29 provided on the surface of the casing 61 of the stator 12 in contact with said electrical box 13.
  • the pins are adapted to connect the box 13 and the casing 61 of the stator 12 and to facilitate the assembly of the pump 10.
  • the box 13 has one or more second pins 30, which extend inside the box 13 and in the direction of a lid 15 for the closure of said box 13.
  • the tips of the second pins 30 are adapted for insertion in corresponding holes provided on the surface of the lid 15 that is directed toward the inside of the box 13.
  • the pins are adapted to connect the box 13 and the lid 15 and to facilitate the assembly of the pump 10.
  • stator accommodation casing made of stainless steel, which eliminates the need for treatments against corrosion, oxidation and wear, allows shorter production cycles and simpler logistical organizations.
  • stator accommodation casing made of stainless steel, by eliminating the need for treatments against corrosion, oxidation and wear, reduces production costs.
  • stator accommodation casing made of steel in contact with the gap sleeve also made of steel, allows better grounding due to steel-on-steel contact, without the need to remove locally the cataphoresis treatment, in the region of interface with the gap sleeve, as instead occurs in the case of an aluminum casing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compressor (AREA)

Claims (7)

  1. Kreiselpumpenanordnung (10) mit Elektromotor (11), der in einem Gehäuse (61) angeordnet ist, die Anordnung (10) umfassend an einem Ende einen Nassbereich (51), der durch eine Spirale (64) gebildet ist und ein Laufrad (52) enthält, und an dem anderen Ende einen Kasten (13), der eine elektrische Platine (14) in Kontakt mit einem Ende des Gehäuses (61) enthält, wobei der Elektromotor (11) von dem bürstenlosen Permanentmagnet-Typ ist und das Gehäuse (61) aus Edelstahl gefertigt ist, dadurch gekennzeichnet, dass das Gehäuse (61) becherförmig mit einer Basis (67) ist, die ein oder mehrere elastisch verformbare Elemente (70) umfasst, die angepasst sind, um eine Schubkraft auf einen oder mehrere entsprechende Stifte (71) zu erzeugen, die auf einer Oberfläche (72) des Kastens (13) angeordnet sind, der der Basis (67) zugewandt ist.
  2. Kreiselpumpenanordnung (10) nach Anspruch 1, dadurch gekennzeichnet, dass das Gehäuse (61) mit einer umlaufenden ringförmigen Lasche (31) versehen ist, die mit einer Vielzahl von Durchgangslöchern (32) versehen ist, die zum Einsetzen von Schrauben (34) zum Befestigen des Gehäuses (61) an einem Körper der Spirale (64) angepasst sind.
  3. Kreiselpumpenanordnung (10) nach einem oder mehreren der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Basis (67) mit einer Öffnung (68) versehen ist, die zum Einsetzen von Kontakten (25) des Elektromotors (11) angepasst ist, die mit der elektrischen Platine (14) verbunden sind.
  4. Kreiselpumpenanordnung (10) nach einem oder mehreren der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Basis (67) mit einem Loch (66) für einen Zugang zu dem Nassbereich (51) und teilweise zu einem Stator (12) des Elektromotors (11) versehen ist.
  5. Kreiselpumpenanordnung (10) nach einem oder mehreren der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Basis (67) des Gehäuses (61) des Elektromotors (11) proximal zu einer freien Spitze eines rohrförmigen Endes (56) einer Spalthülse (53) ist.
  6. Kreiselpumpenanordnung (10) nach einem oder mehreren der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Kasten (13) und das Gehäuse (61) zueinander komplementäre Kontaktflächen aufweisen.
  7. Kreiselpumpenanordnung (10) nach einem oder mehreren der vorherigen Ansprüche, dadurch gekennzeichnet, dass zwischen dem Gehäuse (61) und dem Kasten (13) ein Dichtungselement (69) vorhanden ist, das zusammen mit dem Kasten (13) geformt wird.
EP19150747.4A 2018-01-10 2019-01-08 Kreiselpumpenanordnung mit elektromotor Active EP3511573B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT201800000660A IT201800000660A1 (it) 2018-01-10 2018-01-10 Assemblato di pompa con carcassa perfezionata di alloggiamento del motore elettrico

Publications (2)

Publication Number Publication Date
EP3511573A1 EP3511573A1 (de) 2019-07-17
EP3511573B1 true EP3511573B1 (de) 2022-08-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19150747.4A Active EP3511573B1 (de) 2018-01-10 2019-01-08 Kreiselpumpenanordnung mit elektromotor

Country Status (5)

Country Link
US (1) US20190211831A1 (de)
EP (1) EP3511573B1 (de)
CN (1) CN110017287B (de)
ES (1) ES2925178T3 (de)
IT (1) IT201800000660A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD884033S1 (en) * 2018-02-20 2020-05-12 Dab Pumps S.P.A. Electro-pump
EP3821972B1 (de) * 2019-11-12 2024-07-10 Fresenius Medical Care Deutschland GmbH Verwendung eines filtermoduls zur filtration einer biotechnologischen flüssigkeit und filtermodul zur filtration einer biotechnologischen flüssigkeit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1063751A1 (de) * 1999-06-22 2000-12-27 Grundfos A/S Pumpenaggregat

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09209973A (ja) * 1996-09-05 1997-08-12 Hitachi Ltd 水中モータ
DE19824345A1 (de) * 1998-06-02 1999-12-09 Wilo Gmbh Spaltrohrpumpe mit Wicklungsträger
PT2322807E (pt) * 2007-01-18 2014-02-12 Grundfos Management As Unidade de bomba
PL2500577T3 (pl) * 2011-03-12 2016-12-30 Pompa obiegowa do instalacji grzewczej
PL2500578T3 (pl) * 2011-03-12 2019-04-30 Grundfos Man A/S Pompa obiegowa ogrzewania
KR101332853B1 (ko) * 2013-05-09 2013-11-27 엔엔엔코리아(주) 냉각부재를 내장한 자동차용 전동식 워터펌프
EP2818721B1 (de) * 2013-06-24 2019-02-20 Grundfos Holding A/S Kreiselpumpe
DE102013018317A1 (de) * 2013-10-30 2015-04-30 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Elektrische Maschine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1063751A1 (de) * 1999-06-22 2000-12-27 Grundfos A/S Pumpenaggregat

Also Published As

Publication number Publication date
ES2925178T3 (es) 2022-10-14
EP3511573A1 (de) 2019-07-17
CN110017287B (zh) 2022-06-14
CN110017287A (zh) 2019-07-16
IT201800000660A1 (it) 2019-07-10
US20190211831A1 (en) 2019-07-11

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