EP0665378A1 - Kreiselpumpe mit magnetischem Antrieb - Google Patents

Kreiselpumpe mit magnetischem Antrieb Download PDF

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Publication number
EP0665378A1
EP0665378A1 EP95420014A EP95420014A EP0665378A1 EP 0665378 A1 EP0665378 A1 EP 0665378A1 EP 95420014 A EP95420014 A EP 95420014A EP 95420014 A EP95420014 A EP 95420014A EP 0665378 A1 EP0665378 A1 EP 0665378A1
Authority
EP
European Patent Office
Prior art keywords
wheel
assembly
pump according
pump
rotor
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Withdrawn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
EP95420014A
Other languages
English (en)
French (fr)
Inventor
Pascal Gautier
Gilles Braussen
Bernard Gouthier
Ghislaine Deswert
Ernest Totino
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.)
Mersen SA
Original Assignee
Carbone Lorraine 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 Carbone Lorraine SA filed Critical Carbone Lorraine SA
Publication of EP0665378A1 publication Critical patent/EP0665378A1/de
Withdrawn legal-status Critical Current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
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/027—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
    • F04D13/021—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
    • F04D13/025—Details of the can separating the pump and drive area
    • 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
    • F04D13/026—Details of the bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/40—Transmission of power
    • F05B2260/404—Transmission of power through magnetic drive coupling
    • F05B2260/4041—Transmission of power through magnetic drive coupling the driven magnets encircling the driver magnets

Definitions

  • the invention relates to centrifugal pumps with central magnetic drive, particularly pumps made of carbonaceous material and pumps intended to convey hot and / or corrosive and / or toxic and dangerous fluids.
  • Centrifugal pumps with magnetic drive have as basic components a pump body, a centrifugal impeller, a magnetic drive and assembly and connection elements.
  • Figure 1 schematically illustrates the constitution of a known pump of this type.
  • the pump body 4 is provided with an inlet port 12, a pumping compartment 22 and an outlet port 13.
  • the pump body 4 can be formed from several parts.
  • the magnetic drive device comprises a rotor 23 and a driver 24.
  • the driver consists of a drive wheel 14, which is provided with permanent motor magnets 3 and which is fixed to the shaft 2 of a motor.
  • peripheral drive there are at least two types of magnetic drive: either peripheral drive or central drive.
  • the drive wheel 14 surrounds the rotor 23, while in the second case, which relates to the present application, it is located inside the rotor.
  • the rotor 23 is fixed to the centrifugal wheel 5, most often by means of a common shaft and by screws, so as to form an integral wheel-rotor assembly.
  • the rotor is provided with follower elements 6, which are either permanent magnets, called follower magnets, or parts made of material of high magnetic permeability, called drive parts, or a combination of the two.
  • follower elements 6 are either permanent magnets, called follower magnets, or parts made of material of high magnetic permeability, called drive parts, or a combination of the two.
  • the motor magnets 3 and the follower elements 6 are generally placed opposite and spaced so as to ensure sufficient driving torque.
  • a lubrication device 10 and a particular lubricant are often necessary, but it is known to be able to ensure the lubrication of the bearings using the fluid conveyed (self-lubricating pumps).
  • the self-lubrication is obtained using a secondary circuit which promotes the circulation of the fluid conveyed in a slight clearance at the bearings and / or in reflux conduits 25 in the fixed and / or mobile parts.
  • the pumping compartment 22 occupies a volume closed internally by an air-tight bell 7.
  • the driver 24 and the motor are located outside the pumping compartment and are thus isolated from the transported fluid, which no longer circulates except in the pumping compartment 22.
  • the wall of the air-gap bell 7 is generally thin and configured. so as to pass through the air gap of the drive device, namely into the space which separates the motor magnets 3 from the follower elements 6.
  • pumps intended in particular for the chemical, parachemical and pharmaceutical industries are most often an integral part of complex devices.
  • they in addition to the imperative of resistance to the fluid conveyed, they must meet a certain number of additional imperatives of a technical and above all economic nature, in particular in order to reduce maintenance costs and limit production stoppages.
  • the rotor is cantilevered with respect to the centrifugal wheel (patent US-5201642) or with respect to an axis in the inlet port of the pump (US Pat. No. 4,645,433). It is known that these arrangements allow a slight radial movement, a source of vibrations and possibly parasitic friction. These undesirable effects are accentuated at high temperatures, in particular by the effect of differential expansions between the constituent parts.
  • US Pat. No. 4,645,433 describes a pump, the drive device of which is of reduced volume, but the inlet section is greatly reduced by the presence of the axis of rotation, which considerably increases the pressure drop. and the NPSH (Net Positive Suction Head) required and which consequently increases the risks of degradation of the centrifugal wheel by cavitation.
  • NPSH Net Positive Suction Head
  • the centrifugal pump with magnetic drive comprises a pump body 4, a centrifugal impeller 5, a rotor 23, an air-gap bell 7 and a driver 24, and assembly and connection members, and is characterized in that that the driver is central, in that the pump body 4 is made of carbonaceous material, in particular graphite, in that the air-gap bell 7 is made of non-magnetic and electrically non-conductive material, in that permanent follower magnets 6 are secured to the rotor 23 and completely isolated from the fluid carried, in that the rotor 23 is cylindrical in shape and is fixed directly to the centrifugal wheel 5, without any intermediate part, so as to form a compact wheel-rotor assembly, in that the wheel-rotor assembly is made of carbonaceous material of the same kind as that of the body of pump 4, in that the wheel-rotor assembly rests only on two rigid external annular axial bearings 16 and 17 situated at the ends of said assembly in the axial direction, and in that the wheel-rotor assembly has a secondary circuit
  • the air gap bell 7 is preferably made of composite material comprising in particular carbonaceous products and / or polymerized resins.
  • the secondary circuit preferably consists of an axial hole 19 in the centrifugal wheel 5 or in a series of holes 26 in the centrifugal wheel 5 arranged symmetrically around the axis of rotation of the wheel-rotor assembly.
  • the follower magnets 6 are preferably secured to the wheel-rotor assembly by bonding a cap 31 comprising an annular cavity 32.
  • complementary parts 28 and / or 29 are placed in the cavity 32 in addition to the follower magnets 6.
  • the parts 28 and / or 29, which may be made of magnetic or non-magnetic material, allow precise positioning of the follower magnets 6 and / or confinement of the magnetic field lines.
  • a suitable expansion joint which preferably consists of expanded graphite, can be placed in the residual expansion space 33 in order to wedge the magnets and to absorb the differential expansions.
  • the wheel-rotor assembly abuts against an axial stop 18 on the side of the inlet 12.
  • the bearings 16 and 17 and the stopper 18 are preferably made of carbonaceous material, in particular graphite, or graphite-silicide or silicon carbide.
  • the wheel-rotor assembly rests directly on the external bearings 16 and 17, without the intermediary of bearings fixed to said assembly.
  • the part of the transported liquid circulated in the pumping compartment by the secondary circuit not only allows the self-lubrication of the rear bearing, but also avoids the use of a second axial stop at the rear bearing thanks to an effect liquid bearing and limits the pressure at the rear of the wheel-rotor assembly, which reduces wear on the front stop.
  • the assembly and disassembly operations of the pump according to the invention are carried out by simple stacking and nesting of the constituent parts.
  • the motor can be removed without removing the pump from the device to which it is connected, that is to say that the fluid carried may remain in the pumping compartment during this operation.
  • the number of parts of the pump according to the invention is very small, which facilitates maintenance and reduces costs.
  • the pump according to the invention also has the advantage of great adaptability to very variable conditions of use, especially with regard to pressure and flow.
  • the pump according to the invention offers very good performance, in particular as regards the characteristic curve, the corrosion resistance, the reliability, the mechanical resistance and centering of the wheel-rotor assembly.
  • FIG. 1 shows, in axial section, a centrifugal pump with central magnetic drive of the prior art.
  • the centrifugal wheel 5 is supported by an axial bearing 8 and is provided with axial stops 11a and 11b and with a lubrication device 10.
  • FIG. 2 represents, in axial section, an embodiment of the centrifugal pump with central magnetic drive according to the invention which corresponds to example 1.
  • FIG. 3 illustrates a second embodiment of the pump according to the invention which corresponds to Example 2.
  • FIG. 4 shows, in axial section, an embodiment of the device for fixing the follower magnets which makes it possible to prevent the magnets from being attacked by the transported fluid.
  • the watertight fixing is obtained by gluing along the plane I-I of the wheel-rotor assembly, which has an annular cavity 30, with a cap 31 carrying a complementary annular cavity 32.
  • FIG. 5 illustrates a third embodiment of the pump according to the invention which corresponds to Example 3.
  • a pump was produced according to the invention comprising a drive motor on the shaft 2 of which was fixed the drive wheel 14 provided with motor magnets 3, a pump body 4 in graphite, a wheel-rotor assembly of which the annular cylindrical extension comprised follower magnets 6 located opposite the motor magnets 3, a rear intermediate piece 27 and a gap bell 7.
  • a tight fixing of the follower magnets on the wheel-rotor assembly was obtained by bonding with a cement based on graphite, phenolic resin and catalyst according to the plane I-I of the cap 31 on said assembly (FIG. 4).
  • a complementary part 29 consisting of a steel ring has been inserted into the cavity 32.
  • the residual space 33 has been filled with expanded graphite so as to form an expansion joint.
  • the wheel-rotor assembly was supported externally on the one hand on the pump body 4 and on the intermediate part 27 by means of two external annular axial bearings rigid 16 and 17 located at the two ends of the wheel-rotor assembly in the direction of the axis and on the other hand on an axial stop 18 located on the side of the inlet orifice 12.
  • the bearings 16 and 17 and the stop 18 were made of graphite-silicon and silicon carbide.
  • the wheel-rotor assembly included an axial hole 19 in the centrifugal wheel 5.
  • the bearing 17 rested on an intermediate piece 27 provided with two seals.
  • the air gap bell 7 was made from a resin-carbon fiber composite (Rigilor (R) from the company Le Carbone Lorraine).
  • the pump body 4 which was made in one piece having an inlet 12 and an outlet 13, was fixed to the flange 1 of the motor by means of an assembly plate 15 on which was fixed the air gap bell 7.
  • the pump had an inlet flange 20 and an outlet flange 21.
  • a second pump according to the invention was produced according to Example 1, with the exception of the bearing 17 which rested directly on the body of the pump 4, which made it possible to eliminate the intermediate part 27 and one of the corresponding seals.
  • This pump has been tested on several chemical processes and has given complete satisfaction, in particular with regard to the characteristic curve, the corrosion resistance, the reliability, the mechanical resistance and the centering of the wheel assembly. rotor, even in high temperature conditions.
  • a third pump according to the invention was produced according to Example 1, with the exception of the secondary circuit, which included a series of holes 26 arranged symmetrically around the axis of rotation at the level of the centrifugal wheel, and of the cap. 31 containing the follower magnets which was inserted into an annular cavity 34 in the centrifugal wheel. A second complementary piece 28 of graphite and of annular shape was placed in the annular cavity 32 of the cap 31.
  • This pump has been tested on several chemical processes and has given complete satisfaction, in particular with regard to the characteristic curve, the corrosion resistance, the reliability, the mechanical resistance and the centering of the wheel assembly. rotor, even in high temperature conditions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP95420014A 1994-01-26 1995-01-23 Kreiselpumpe mit magnetischem Antrieb Withdrawn EP0665378A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9401104 1994-01-26
FR9401104A FR2715442B1 (fr) 1994-01-26 1994-01-26 Pompe centrifuge à entraînement magnétique.

Publications (1)

Publication Number Publication Date
EP0665378A1 true EP0665378A1 (de) 1995-08-02

Family

ID=9459644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95420014A Withdrawn EP0665378A1 (de) 1994-01-26 1995-01-23 Kreiselpumpe mit magnetischem Antrieb

Country Status (4)

Country Link
US (1) US5501582A (de)
EP (1) EP0665378A1 (de)
JP (1) JPH07224785A (de)
FR (1) FR2715442B1 (de)

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WO2000009889A1 (en) * 1998-08-11 2000-02-24 Cooper Paul V Molten metal pump with monolithic rotor
US6303074B1 (en) 1999-05-14 2001-10-16 Paul V. Cooper Mixed flow rotor for molten metal pumping device
US6345964B1 (en) 1996-12-03 2002-02-12 Paul V. Cooper Molten metal pump with metal-transfer conduit molten metal pump
US6689310B1 (en) 2000-05-12 2004-02-10 Paul V. Cooper Molten metal degassing device and impellers therefor
US6723276B1 (en) 2000-08-28 2004-04-20 Paul V. Cooper Scrap melter and impeller
US7731891B2 (en) 2002-07-12 2010-06-08 Cooper Paul V Couplings for molten metal devices
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
US8075837B2 (en) 2003-07-14 2011-12-13 Cooper Paul V Pump with rotating inlet
US8178037B2 (en) 2002-07-12 2012-05-15 Cooper Paul V System for releasing gas into molten metal
US8333666B2 (en) 2004-12-10 2012-12-18 Sundyne Corporation Inner drive for magnetic drive pump
US8337746B2 (en) 2007-06-21 2012-12-25 Cooper Paul V Transferring molten metal from one structure to another
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
US8366993B2 (en) 2007-06-21 2013-02-05 Cooper Paul V System and method for degassing molten metal
US8444911B2 (en) 2009-08-07 2013-05-21 Paul V. Cooper Shaft and post tensioning device
US8449814B2 (en) 2009-08-07 2013-05-28 Paul V. Cooper Systems and methods for melting scrap metal
US8524146B2 (en) 2009-08-07 2013-09-03 Paul V. Cooper Rotary degassers and components therefor
US8529828B2 (en) 2002-07-12 2013-09-10 Paul V. Cooper Molten metal pump components
US8535603B2 (en) 2009-08-07 2013-09-17 Paul V. Cooper Rotary degasser and rotor therefor
US8613884B2 (en) 2007-06-21 2013-12-24 Paul V. Cooper Launder transfer insert and system
US8714914B2 (en) 2009-09-08 2014-05-06 Paul V. Cooper Molten metal pump filter
US9011761B2 (en) 2013-03-14 2015-04-21 Paul V. Cooper Ladle with transfer conduit
US9108244B2 (en) 2009-09-09 2015-08-18 Paul V. Cooper Immersion heater for molten metal
US9156087B2 (en) 2007-06-21 2015-10-13 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
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Also Published As

Publication number Publication date
FR2715442B1 (fr) 1996-03-01
FR2715442A1 (fr) 1995-07-28
JPH07224785A (ja) 1995-08-22
US5501582A (en) 1996-03-26

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