EP1840381A2 - Pompe pour faire recirculer des fluides avec dispositif à plusieurs vitesses pour la transmission d'un mouvement rotatif à la turbine - Google Patents

Pompe pour faire recirculer des fluides avec dispositif à plusieurs vitesses pour la transmission d'un mouvement rotatif à la turbine Download PDF

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Publication number
EP1840381A2
EP1840381A2 EP07075223A EP07075223A EP1840381A2 EP 1840381 A2 EP1840381 A2 EP 1840381A2 EP 07075223 A EP07075223 A EP 07075223A EP 07075223 A EP07075223 A EP 07075223A EP 1840381 A2 EP1840381 A2 EP 1840381A2
Authority
EP
European Patent Office
Prior art keywords
pump according
armature
coupling
electromagnet
integral
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Withdrawn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
EP07075223A
Other languages
German (de)
English (en)
Inventor
Piercarlo Boffelli
Erminio Depoli
Claudio Bellotti
Fabio Natale
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.)
Baruffaldi SpA
Original Assignee
Baruffaldi 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 Baruffaldi SpA filed Critical Baruffaldi SpA
Publication of EP1840381A2 publication Critical patent/EP1840381A2/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Withdrawn legal-status Critical Current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
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • 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
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/022—Units comprising pumps and their driving means containing a coupling a coupling allowing slip, e.g. torque converter
    • 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
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/027—Details of the magnetic circuit

Definitions

  • the present invention relates to a device for actuating the means for recirculating a fluid for cooling engines, in particular for motor vehicles.
  • the technical problem which is posed, therefore, is to provide a device for actuating the means for recirculating fluids for cooling engines of vehicles and the like, able to cause a variation in the speed of rotation of the impeller of the said recirculating means, depending on the actual operating requirements of the engine, and in particular cause rotation of the pump at a number of revolutions different from that of the driving shaft and able to be determined depending on the actual cooling requirement of the engine, which device has compact dimensions and is without costly projecting rotating masses and formed by a small number of costly parts.
  • this device should have small dimensions, in particular small radial dimensions, but at the same time should be able to generate high torques also at a low engine running speed so as to be able to applied also to high-performance pumps of heavy vehicles which have an engine performing a small number of revolutions.
  • the device should be easy and inexpensive to produce and assemble and be able to be installed easily on the pump body without the need for special adaptation.
  • a pump for recirculating a cooling fluid comprising a device for transmitting the movement from movement generating means to the impeller rigidly connected to a driven shaft, in which said transmission device comprises at least one first friction coupling and at least one second friction coupling which are substantially concentric with each other and at least one induction coupling situated between said movement generating means and the driven shaft, said first and second friction couplings being of the electromagnetic type, and in that one of the said friction couplings comprises a permanent magnet which is integral with said movement generating means.
  • the impeller 1 of a pump for recirculating the cooling fluid of motor vehicles and the like is mounted on a first end of a shaft 2 which is supported by a fixed assembly 10 comprising the body 11 of the pump integral with the base 11a of the vehicle engine.
  • the pump body has, arranged inside it (but not shown here), a seal which is coaxial with the shaft 2 and a bearing, on the inner race of which the shaft 2 of the impeller is keyed.
  • the base 11a of the engine also has, mounted thereon, a first bearing 4, on the outer race of which a circular ring 3 is keyed and has an extension in the axial direction 3b which has a form suitable for engagement with a drive belt 3a for actuating the ring which forms, in this way, the rotor of a first electromagnetic coupling 20 which comprises a fixed electromagnet 22 housed inside a corresponding first seat 3 of the said rotor and an armature 23 which is made of friction material and arranged facing the rotor 3 on the opposite side to the electromagnet and is integral with a resilient membrane 23a which is in turn attached to a driven element consisting of a flange 25 mounted on the shaft 2 by means of a corresponding sleeve 26.
  • a first electromagnetic coupling 20 which comprises a fixed electromagnet 22 housed inside a corresponding first seat 3 of the said rotor and an armature 23 which is made of friction material and arranged facing the rotor 3 on the opposite side to the electromagnet
  • the armature 23 is able to perform movements in the axial direction towards/away from the rotor 3, but is locked as regards relative rotation with respect to the flange 25.
  • the device according to the invention envisages the presence of a second electromagnet 32 which is concentric with the first electromagnet and the current of which is in turn controlled for actuation of a second armature 33 forming part of a second coupling 30 and in turn connected to a resilient membrane 33a attached to a ring 35 keyed onto an associated bearing 36 mounted on the sleeve 26 integral with the shaft 2.
  • the said ring 35 has, mounted thereon, a conducting support 47a which carries a magnetizable element 47 which forms the first part of a Foucault current induction coupling 40, the second part of which is formed by a plurality of small magnets 48 which are integral with the circular flange 25 connected to the driven shaft 2 so as to be situated axially opposite the said magnetizable element 47 with a predetermined air gap.
  • the rotor parts 3 situated opposite the armatures 23,33 envisage interruptions 3c in the magnetic conductivity of the rotor in order to produce suitable annular closing of the magnetic flux lines for recall of the said armatures in the axial direction.
  • Fig. 1 also shows the presence of a permanent magnet 50 which is situated between the first electromagnet 22 and the first armature 23; in a preferred embodiment said magnet 50 is integral with an element 51 made of magnetizable material which is situated axially opposite the said armature 33.
  • the magnet is magnetized so as to have frontal segments alternating in the radial direction with N-S polarities, if necessary also with several poles and with the presence of an iron element 52 which is arranged on the opposite side to the armature 23 with the function of a flow concentrator.
  • the device is also able to ensure the so-called "fail safe" safety condition since, during normal operating conditions, the current supplied to the first electromagnet 22 produces neutralization of the magnet field for recall of the armature 23, while in the event of a total power failure, the magnet 50 is any case able to recall the first armature 23 and ensure fast rotation of the pump 1 which causes cooling of the engine liquid.
  • the magnet 50 may be applied in the region of the second magnet, in this case producing low-speed safety operation.
  • the operating principle of the pump actuating device is as follows:
  • the presence of the permanent magnet ensures that in the event of an electrical failure the armature is always engaged with the rotor, ensuring operation of the pump and recirculation of the cooling fluid (so-called "fail-safe" operation).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP07075223A 2006-03-28 2007-03-23 Pompe pour faire recirculer des fluides avec dispositif à plusieurs vitesses pour la transmission d'un mouvement rotatif à la turbine Withdrawn EP1840381A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000117U ITMI20060117U1 (it) 2006-03-28 2006-03-28 Pompa per il ricircolo di fluidi con dispositivo a piu' velocita' per la trasmissione del moto di rotazione alla girante

Publications (1)

Publication Number Publication Date
EP1840381A2 true EP1840381A2 (fr) 2007-10-03

Family

ID=38141257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07075223A Withdrawn EP1840381A2 (fr) 2006-03-28 2007-03-23 Pompe pour faire recirculer des fluides avec dispositif à plusieurs vitesses pour la transmission d'un mouvement rotatif à la turbine

Country Status (2)

Country Link
EP (1) EP1840381A2 (fr)
IT (1) ITMI20060117U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20101720A1 (it) * 2010-09-22 2012-03-23 Baruffaldi Spa Dispositivo di trasmissione del moto a ventole di raffreddamento di motori con arresto della ventola corrispondentemente ad una condizione di folle della stessa

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20101720A1 (it) * 2010-09-22 2012-03-23 Baruffaldi Spa Dispositivo di trasmissione del moto a ventole di raffreddamento di motori con arresto della ventola corrispondentemente ad una condizione di folle della stessa

Also Published As

Publication number Publication date
ITMI20060117U1 (it) 2007-09-29

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