EP1277965B1 - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

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Publication number
EP1277965B1
EP1277965B1 EP02250460.9A EP02250460A EP1277965B1 EP 1277965 B1 EP1277965 B1 EP 1277965B1 EP 02250460 A EP02250460 A EP 02250460A EP 1277965 B1 EP1277965 B1 EP 1277965B1
Authority
EP
European Patent Office
Prior art keywords
rotor
chamber
pump
assembly
turbine
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.)
Expired - Lifetime
Application number
EP02250460.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1277965A2 (en
EP1277965A3 (en
Inventor
Ricardo Augusto De Facci Oliveira
Fernando Augusto Becker
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.)
Eberle Equipamentos e Processos SA
Original Assignee
Eberle Equipamentos e Processos SA
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 Eberle Equipamentos e Processos SA filed Critical Eberle Equipamentos e Processos SA
Publication of EP1277965A2 publication Critical patent/EP1277965A2/en
Publication of EP1277965A3 publication Critical patent/EP1277965A3/en
Application granted granted Critical
Publication of EP1277965B1 publication Critical patent/EP1277965B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D13/0646—Units comprising pumps and their driving means the pump being electrically driven the hollow pump or motor shaft being the conduit for 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
    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps

Definitions

  • the present invention relates to a pump, more specifically, a hydraulic one.
  • electro-mechanical pumps used for driving fluids generally constituted of a chamber containing the electro-magnetic part, basically comprising the stator and the rotor armature, as well as another chamber with a hydraulic part, basically formed of the hydraulic turbine that drives the liquid.
  • the electro-magnetic and hydraulic chambers need to be insulated from each other so as to prevent the liquid from reaching the stator and the rotor, causing short-circuits and even irreparable damage.
  • several mechanical apparatus are required, such as an axle, roller bearings, bearing journals, cooling systems, hydraulic seals, among others.
  • roller bearing journals for instance, have the function of supporting the rotor axle, on which the rotor cage is mounted, so that, when the latter is induced by magnetic forces from the stator, the rotor turns, assisted by these bearings.
  • the journals are lubricated with oil or grease so as to decrease friction and wear between the parts in contact.
  • One end of the rotor axle is connected to the hydraulic turbine, formed of blades, which, upon induction of the rotor, begins a rotational movement driving the liquid to be pumped.
  • cooling systems are used, usually constituted of ventilators.
  • Such cooling systems generally comprise propellers coupled to the end of the rotor axle, outside the pump and opposed to the hydraulic pump, which, taking advantage of the rotation of the rotor, turns to cool both the stator and the rotor.
  • the pumps of the prior art depend upon the perfect functioning of the mechanical seals to prevent the liquid from passing from the hydraulic chamber into the electro-magnetic chamber. As already mentioned, this undesirable contact of the liquid with the stator and rotor may cause short-circuits, as well as a decrease in the lubrication of the journals, resulting in possible seizure of the rotor.
  • the main objective of the present invention is to simplify the composition of a traditional pump by eliminating sealings, such as mechanical seals or gaskets, as well as roller bearings, axles and external cooling systems, such as ventilators, thereby reducing the chance of the pump being damaged.
  • This new pump motor further provides cooling of the stator-rotor assembly by circulating the pumped fluid itself, as described in patent application PI 0004206-4 .
  • the invention also has the objective of providing a new pump that is more compact than the present ones, easy to manufacture and assemble, by virtue of its smaller number of components, thus resulting in better automation and cost reduction.
  • Another objective of the present invention is to provide a pump that is more efficient, that is, presenting lower energy loss.
  • the invention aims at providing a safer, more protected and corrosionproof pump motor, enabling immersion and installation in environments that are aggressive and without cooling.
  • a further objective of the present invention is to provide a pump with a very low noise level and lubrication provided by the circulating fluid itself.
  • DE 38 22897 discloses a centrifugal pump having vanes mounted at one end of an axle, the axle being supported by mechanical bearings close to its both ends.
  • the pumped medium flows, from an inlet at one end of the axle, between the axle and a rotor of an electric motor mounted about the axle to rotate the vanes, along to the vanes which then impel the medium through an outlet at the circumference of the vanes.
  • EP 0612 135 discloses a centrifugal pump having a turbine which pumps a fluid from an inlet at the centre of the turbine to an outlet at its circumference.
  • the turbine is connected by a short shaft to a rotor of a motor that turns the turbine, and the turbine and rotor are disposed inside a common chamber.
  • the rotor is provided with two axially spaced rings, which locate the rotor and turbine for rotation inside the walls of the chamber.
  • a duct, external to the chamber is provided between the inlet and the far side of the rotor to allow the fluid to circulate over the rotor.
  • a pump comprising a casing, having at least one first hermetically sealed chamber and at least one second chamber adjacent to said first chamber, provided with a fluid passage and having an inlet and an outlet for fluids. Said chambers are separated by means of walls, preferably made of injected polymer.
  • the pump further comprises a stator located in the first chamber.
  • the stator is in a position adjacent to the walls that separate the first chamber from the second, so that the fluid circulating through the second chamber will cool it by heat transmission.
  • An integral rotor-turbine assembly wholly located in the second chamber, is provided, and at least a portion of said assembly is positioned concentrically in relation to the stator.
  • This assembly is induced by the stator to drive a fluid from the inlet to the outlet.
  • a fluid film is maintained around the assembly, in order to bring about perfect rotation with minimum friction and without any need for journals.
  • the space between said assembly and the stator, called a gap is substantially filled with said walls of the first and second chambers, including, furthermore, the fluid film circulating between them.
  • a metallic component called the rotor cage, preferably composed of iron and aluminium, capable of being induced by the stator, is provided inside the hermetically sealed assembly.
  • such an assembly is made from polymeric material.
  • the assembly is bored through to provide a passage for the turbine inside the rotor.
  • the turbine of said assembly is composed of turbine blades to centrifuge the fluids. In this way, upon functioning of a possible embodiment of the pump, the fluid, after passing through the inlet of the second chamber, goes into the rotor-turbine assembly, passes through the internal passageway and, after reaching the turbine blades, is driven towards the outlet.
  • the circulating fluid is also used as a lubricant.
  • a film of circulating fluid will pass between the walls of the second chamber and the rotor-turbine assembly, allowing the latter to make a floating rotary movement within the second chamber by virtue of the inducing forces.
  • the pump of the present invention provides a simpler configuration with less expensive manufacture, since it is basically composed of an induction means and a movement-transmission means similar to those of the prior art, such as stators and rotors, which eliminate the use of a ventilator, as well as roller bearings, axles and mechanical seals.
  • Figure 1 shows a present-day pump, encountered in the prior art, comprising a coiled stator 4, a rotor 5 and roller bearings 3, which support the axle 9 on which the cage of said rotor 5 is mounted.
  • the axle 3 will be responsible for transmitting driving force from the rotor 5 by means of induction of the magnetic field of the stator 4.
  • a ventilator 1 which is responsible for cooling the stator-rotor assembly, and of covers 2 located on both sides of the rotor 5, which support said roller bearings.
  • the rotor 5 has to be perfectly centered with respect to the stator 4, so as to avoid contact between their magnetic iron.
  • this space between the rotor 5 and the stator 4, called a gap, is filled with air.
  • Figure 1 further illustrates mechanical seals 8, which are widely used in the pump motors of the prior art, to guarantee ventilation and separation between the electric part and the hydraulic part of the pump motor, the hydraulic part being constituted of the turbine 7 and the volute 6.
  • FIG 2 illustrates a preferred embodiment of the present invention, in which some of the elements shown in figure 1 are absent.
  • This embodiment illustrates a pump 10 comprising a casing 14 having a first hermetically sealed chamber 19 and a second internal chamber 17 with at least one inlet 15 and one outlet 16 defining the passageway 18 between said inlet and outlet.
  • the casing 14 may be made from a polymeric material or any other type of material suitable for the specified conditions, including bad weather.
  • An integral rotor-turbine assembly 11 is located in the chamber 17 to drive the fluids that pass through said chamber.
  • This assembly is made from a polymeric material and, in addition, is bored through to define a passageway for the turbine inside the rotor.
  • the turbine of said assembly is composed of blades for centrifuging the fluids.
  • the casing 14 also has a first chamber 19, hermetically sealed from the fluids that circulate through the second chamber 17. Both the external walls of the casing and the walls that separate the second chamber 17 from the first chamber 19 are formed of injectable polymeric material.
  • the stator 12 which may be any one of those known from the prior art, is installed in this first chamber 19 to induce, by means of a magnetic field, the driving of the rotor-turbine assembly 11, located in the second chamber 17 of fluid circulation.
  • This embodiment of the pump of the present invention also has its second chamber 17 defining passageways other than that going from the inlet to the outlet, so that a portion of the fluids will circulate through this chamber. Such passageways in this embodiment cause the fluid to circulate around the first chamber 19, cooling the stator 12 located therein by heat transmission.
  • a small portion of the fluid that enters inlet 15 and circulates through the second chamber 17 passes through the communication means 13 between one of the walls of the second chamber 17 and the rotor-turbine assembly 11, creating a constant fluid film, which enables this assembly to turn freely submerged in the liquid, without having any contact with the walls of the second chamber 17 while the pump is functioning.
  • a film acts as a support for the assembly 11 and, at the same time, as a lubricant that virtually eliminates friction between the walls of the second chamber and of the assembly 11, further resulting in a very low noise level.
  • the magnetic field created by the stator 12 maintains the former in a balanced position around its axle, so that, upon rotational movement, the magnetic forces prevent the assembly from contacting the walls of the second chamber 17.
  • the second chamber 17 has passageways that enable the liquid to circulate through it, a reduction in noise level is achieved, and this also eliminates the need for industrial lubricants and external cooling systems. Since the pump is basically composed of an injectable polymeric material and there is a decrease in the number of components (i.e. does not include seals) in comparison with those of the prior art, it becomes simpler and less expensive to assemble. In addition, the energy losses are minimised by the low friction between the rotor-turbine assembly 11 and the walls of the second chamber 17.
  • Another important aspect of the present invention is that the space between the stator 4 and the rotor 5 of the pumps of the prior art, the so-called gaps, are filled with air.
  • the polymeric wall of both the second chamber 17 and the rotor-turbine assembly 11 guaranteeing a perfect centering of the magnetic materials of the stator 12 and the assembly 11, as well as a better balanced position of the latter around its axle, so that, upon rotation, contact with the walls of the second chamber 17 will be avoided.
  • the present invention also provides a non-corrosive pump, since only the surface covered with polymer will have contact with the fluid. Therefore, the latter may be aggressive without causing any damage to the pump motor.
  • the pump of the present invention since the liquid itself is used as a coolant, the pump of the present invention may be installed in environments without ventilation or even submerged.

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)
  • Rotary Pumps (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
EP02250460.9A 2001-07-16 2002-01-23 Centrifugal pump Expired - Lifetime EP1277965B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRPI0103034-5A BR0103034B1 (pt) 2001-07-16 2001-07-16 bomba.
BR0103034 2001-07-16

Publications (3)

Publication Number Publication Date
EP1277965A2 EP1277965A2 (en) 2003-01-22
EP1277965A3 EP1277965A3 (en) 2004-08-04
EP1277965B1 true EP1277965B1 (en) 2016-11-02

Family

ID=3947710

Family Applications (2)

Application Number Title Priority Date Filing Date
EP02250460.9A Expired - Lifetime EP1277965B1 (en) 2001-07-16 2002-01-23 Centrifugal pump
EP03250048A Expired - Lifetime EP1398508B1 (en) 2001-07-16 2003-01-03 Canned centrifugal pump

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP03250048A Expired - Lifetime EP1398508B1 (en) 2001-07-16 2003-01-03 Canned centrifugal pump

Country Status (14)

Country Link
US (1) US20030012648A1 (pt)
EP (2) EP1277965B1 (pt)
JP (2) JP4180853B2 (pt)
AR (1) AR030789A1 (pt)
AT (1) ATE491886T1 (pt)
AU (2) AU2002300182B2 (pt)
BR (1) BR0103034B1 (pt)
CA (2) CA2393243C (pt)
DE (1) DE60335328D1 (pt)
DK (1) DK1398508T3 (pt)
ES (2) ES2612908T3 (pt)
HK (1) HK1063498A1 (pt)
MX (2) MXPA02006940A (pt)
PT (2) PT1277965T (pt)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7048518B2 (en) 2001-07-16 2006-05-23 Eberle Equipamentos E Processos S.A. Pump
AT502338B1 (de) 2005-08-26 2009-06-15 Wilo Ag Pumpe zur förderung eines flüssigen medium
DE102006023379B4 (de) * 2006-05-17 2013-10-02 Al-Ko Kober Ag Flüssigkeitspumpe
JP5371939B2 (ja) * 2010-12-07 2013-12-18 株式会社市丸技研 流体送り装置及びタイヤ加硫装置
CN102828998B (zh) * 2012-08-29 2014-12-10 三一重工股份有限公司 一种发动机水泵及装设有该水泵的发动机、工程机械
RU2548698C2 (ru) * 2013-03-01 2015-04-20 Открытое акционерное общество "Информационные спутниковые системы" имени академика М.Ф. Решетнёва" Электронасосный агрегат
BR102014021617B1 (pt) 2014-09-01 2023-04-11 Mundial S/A Produtos De Consumo Motobomba de mancal flutuante arrefecida por um fluido circulante
US10551498B2 (en) 2015-05-21 2020-02-04 Navico Holding As Wireless sonar device
US9759813B2 (en) 2015-06-22 2017-09-12 Appetite Lab Inc. Devices and methods for locating and visualizing underwater objects
EP3156663B1 (de) * 2015-10-15 2019-07-24 Grundfos Holding A/S Kreiselpumpenaggregat
CN106704208A (zh) * 2017-03-06 2017-05-24 威隼汽车科技（宁波）有限公司 一种汽车电子水泵
RU181506U1 (ru) * 2017-04-10 2018-07-17 Владислав Савельевич Медведев Ротор электродвигателя герметичного электронасоса с полым валом
CN114109907A (zh) * 2020-08-27 2022-03-01 芜湖美的厨卫电器制造有限公司 泵盖、水泵和热水器
CN112283166B (zh) * 2020-11-09 2022-06-24 江苏优格曼航空科技有限公司 一种用于高速磁悬浮风机的易安装机壳结构
CN117450114B (zh) * 2023-11-21 2024-04-05 湖南新安特风机有限公司 消防系统智能风机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB485225A (en) * 1936-02-29 1938-05-17 Hans Moser Improvements in or relating to electric motors

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1320841A (en) * 1971-01-04 1973-06-20 Matsushita Electric Ind Co Ltd Motor driven pump
CH564155A5 (pt) * 1972-06-22 1975-07-15 Bauknecht Gmbh G
DE3822897A1 (de) * 1988-07-06 1990-01-11 Webasto Ag Fahrzeugtechnik Umwaelzpumpe
US5990588A (en) * 1996-12-13 1999-11-23 General Electric Company Induction motor driven seal-less pump
US6068455A (en) * 1997-03-20 2000-05-30 B/E Aerospace Long life pump system
US5921683A (en) * 1997-09-12 1999-07-13 United Technologies Corporation Bearing arrangement for air cycle machine
US5997261A (en) * 1997-10-31 1999-12-07 Siemens Canada Limited Pump motor having fluid cooling system
DE10108810A1 (de) * 2001-02-16 2002-08-29 Berlin Heart Ag Vorrichtung zur axialen Förderung von Flüssigkeiten

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB485225A (en) * 1936-02-29 1938-05-17 Hans Moser Improvements in or relating to electric motors

Also Published As

Publication number Publication date
AU2003200128B2 (en) 2009-07-16
ES2358012T3 (es) 2011-05-04
BR0103034A (pt) 2003-07-29
PT1277965T (pt) 2017-02-13
AU2003200128A1 (en) 2004-04-01
JP4180853B2 (ja) 2008-11-12
PT1398508E (pt) 2011-03-15
EP1398508A2 (en) 2004-03-17
HK1063498A1 (en) 2004-12-31
ES2612908T3 (es) 2017-05-19
BR0103034B1 (pt) 2009-05-05
US20030012648A1 (en) 2003-01-16
CA2393243C (en) 2008-10-14
CA2416085A1 (en) 2004-03-16
JP2004108353A (ja) 2004-04-08
JP2003097482A (ja) 2003-04-03
AR030789A1 (es) 2003-09-03
DK1398508T3 (da) 2011-03-28
EP1277965A2 (en) 2003-01-22
ATE491886T1 (de) 2011-01-15
EP1398508A3 (en) 2004-09-01
MXPA03000417A (es) 2004-12-09
EP1398508B1 (en) 2010-12-15
CA2393243A1 (en) 2003-01-16
MXPA02006940A (es) 2004-12-13
AU2002300182B2 (en) 2008-01-10
EP1277965A3 (en) 2004-08-04
DE60335328D1 (de) 2011-01-27
BR0103034C1 (pt) 2003-11-04

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