EP0399971A1 - Drive device for an impeller for sterile applications - Google Patents

Drive device for an impeller for sterile applications Download PDF

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Publication number
EP0399971A1
EP0399971A1 EP90850179A EP90850179A EP0399971A1 EP 0399971 A1 EP0399971 A1 EP 0399971A1 EP 90850179 A EP90850179 A EP 90850179A EP 90850179 A EP90850179 A EP 90850179A EP 0399971 A1 EP0399971 A1 EP 0399971A1
Authority
EP
European Patent Office
Prior art keywords
impeller
recess
drive device
stator
vessel
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.)
Granted
Application number
EP90850179A
Other languages
German (de)
French (fr)
Other versions
EP0399971B1 (en
EP0399971B2 (en
Inventor
Urban Albihnsson
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.)
Steridose Systems AB
Original Assignee
Steridose Systems AB
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
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Application filed by Steridose Systems AB filed Critical Steridose Systems AB
Publication of EP0399971A1 publication Critical patent/EP0399971A1/en
Publication of EP0399971B1 publication Critical patent/EP0399971B1/en
Application granted granted Critical
Publication of EP0399971B2 publication Critical patent/EP0399971B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/453—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements
    • B01F33/4535—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements using a stud for supporting the stirring element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/40—Mounting or supporting mixing devices or receptacles; Clamping or holding arrangements therefor
    • B01F35/41—Mounting or supporting stirrer shafts or stirrer units on receptacles
    • B01F35/411—Mounting or supporting stirrer shafts or stirrer units on receptacles by supporting only one extremity of the shaft
    • B01F35/4112—Mounting or supporting stirrer shafts or stirrer units on receptacles by supporting only one extremity of the shaft at the bottom of the receptacle, e.g. by studs

Definitions

  • the present invention relates to a drive device for an impeller which is rotatably mounted within a vessel for stirring and mixing sterile fluids, and which device is located in an inwardly-directed cylindrical recess in a bottom wall of the vessel, the recess being intended to receive the drive device, and which stirrer includes a peripheral section which surrounds the cylindrical recess.
  • the object of the present invention is therefore to provide a simpler drive device which can tolerate high temperatures.
  • a drive device characterised by a stator fixedly secured in the recess, which stator includes a magnetisable iron core and induction coils connectable to a 3-phase a.c. source, and by inductively magnetisable elements located in the peripheral part of the impeller for generating a torque when the stator is supplied with a 3-phase alternating current so that the impeller rotates in a predetermined direction of rotation.
  • the impeller is rotatably mounted on a stub axle which is centrally located on an end wall which demarkates the recess.
  • a small clearance is provided between the cylindrical recess and the peripheral section of the impeller.
  • the magnetisable elements are hermatically encased in the impeller.
  • the mixing vessel shown in figure 1 is provided with a four-­wheeled chassis 10 which supports the vessel 11.
  • the vessel is intended for use in a large process plant, for example for preparation of medicaments, and is provided with a number of inlets and outlets 12 and regulating valves 13.
  • Various sterile fluids are delivered to the vessel, where they are mixed together by means of a driving device 14, after which the resulting mixture is drawn from the vessel.
  • the driving arrangement 14 is shown more clearly in figure 2 and includes an inwardly-directed cylindrical recess 15 in the bottom wall 16 of the vessel, the recess being welded in such a way that no openings or inlets occur in this section of the vessel wall.
  • a impeller 17 is rotatably mounted on a stub axle 18 which is centrally located on an end wall 19 which demar­cates the cylindrical recess 15.
  • the impeller 17 is, like the vessel 11, principally manufac­tured from acidproof stainless steel, with a number of angled blades 20 and a central lifting ring 22.
  • the impeller 17 presents a peripheral section 21 which surrounds the cylindri­cal recess 15 and contains an inductively magnetisable stack of plates 23 and a rotor which is intended for use in a 3-phase external-rotor a.c. motor.
  • a stator 24 is fixedly secured in the recess 15, which stator includes a magnetisable iron core 25 and induction coils connectable to a 3-phase a.c. source.
  • the plate stack 23 is also magnetised by induction, and, due to the varying direction of the a.c. current in the magnetic field, forces are attained which endeavor to rotate the impeller 17 in a predetermined direction.
  • Figure 3 shows a control unit 26 for controlling the impeller's drive, comprising a contact breaker 27, a speed regulator 28 (number of revolutions) and an electrical cable 29 connected to the stator 24 of the driving device.
  • the speed regulator 28 enables the rotational speed of the impeller to be steplessly varied from 0-500 rpm (circa).
  • the drive device can be provided with some form of cooling, for example a fan.

Landscapes

  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Telephone Function (AREA)
  • Food-Manufacturing Devices (AREA)
  • Confectionery (AREA)
  • Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
  • Telephonic Communication Services (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
  • Selective Calling Equipment (AREA)

Abstract

A drive device for an impeller (17) which is rotatably mounted within a vessel (11) for stirring and mixing sterile fluids. The drive device is rotatably mounted at an inwardly-directed cylindrical recess (15) in a bottom wall (16) of the vessel, the recess (15) being intended to receive the drive device. The impeller (17) includes a peripheral section (21) which sur­rounds the cylindrical recess (15). A stator (24) is fixedly secured in the recess (15), which stator includes a magneti­sable iron core (25) and induction coils connectable to a 3-­phase alternating current source. Inductively magnetisable elements 23 are located in the peripheral section (21) of the impeller (17) for generating a torque when the stator (24) is supplied with a 3-phase alternating current so that the impeller rotates in a predetermined direction.

Description

  • The present invention relates to a drive device for an impeller which is rotatably mounted within a vessel for stirring and mixing sterile fluids, and which device is located in an inwardly-directed cylindrical recess in a bottom wall of the vessel, the recess being intended to receive the drive device, and which stirrer includes a peripheral section which surrounds the cylindrical recess.
  • It is known that stirring of fluid within a closed vessel can be accomplished by means of a magnetic coupling between an external rotating drive unit and a completely separate internal stirring impeller. This known driving arrangement is comparati­vely expensive to achieve, since the external drive unit normally comprises a standard electric motor, a gear drive to transmit the drive through 90°, a rotor with periphally-mounted permanent magnets driven by said gear drive, and an impeller correspondingly equipped with magnets (see for example US 4209259). The strengh of the permanent magnets in this device weakens under duration of heat. Hot steam (180°C) can be used for sterilising the vessel.
  • The object of the present invention is therefore to provide a simpler drive device which can tolerate high temperatures.
  • This object is achieved according to the invention by a drive device characterised by a stator fixedly secured in the recess, which stator includes a magnetisable iron core and induction coils connectable to a 3-phase a.c. source, and by inductively magnetisable elements located in the peripheral part of the impeller for generating a torque when the stator is supplied with a 3-phase alternating current so that the impeller rotates in a predetermined direction of rotation.
  • According to a preferred embodiment of the invention, the impeller is rotatably mounted on a stub axle which is centrally located on an end wall which demarkates the recess.
  • Suitably a small clearance is provided between the cylindrical recess and the peripheral section of the impeller.
  • According to a further preferred embodiment of the invention, the magnetisable elements are hermatically encased in the impeller.
  • The above-mentioned, and further, characteristics of the invention will be described in more detail in the following, with reference to the attached drawings in which
    • figure 1 shows a perspective view of a mixing vessel equipped with a drive device according to the invention,
    • figure 2 is a partial sectioned view of the drive device,
    • figure 3 shows a control unit for the drive device.
  • The mixing vessel shown in figure 1 is provided with a four-­wheeled chassis 10 which supports the vessel 11. The vessel is intended for use in a large process plant, for example for preparation of medicaments, and is provided with a number of inlets and outlets 12 and regulating valves 13. Various sterile fluids are delivered to the vessel, where they are mixed together by means of a driving device 14, after which the resulting mixture is drawn from the vessel.
  • The driving arrangement 14 is shown more clearly in figure 2 and includes an inwardly-directed cylindrical recess 15 in the bottom wall 16 of the vessel, the recess being welded in such a way that no openings or inlets occur in this section of the vessel wall. A impeller 17 is rotatably mounted on a stub axle 18 which is centrally located on an end wall 19 which demar­cates the cylindrical recess 15.
  • The impeller 17 is, like the vessel 11, principally manufac­tured from acidproof stainless steel, with a number of angled blades 20 and a central lifting ring 22. The impeller 17 presents a peripheral section 21 which surrounds the cylindri­cal recess 15 and contains an inductively magnetisable stack of plates 23 and a rotor which is intended for use in a 3-phase external-rotor a.c. motor.
  • A stator 24 is fixedly secured in the recess 15, which stator includes a magnetisable iron core 25 and induction coils connectable to a 3-phase a.c. source. When these coils are magnetised by the a.c. current, the plate stack 23 is also magnetised by induction, and, due to the varying direction of the a.c. current in the magnetic field, forces are attained which endeavor to rotate the impeller 17 in a predetermined direction.
  • Figure 3 shows a control unit 26 for controlling the impeller's drive, comprising a contact breaker 27, a speed regulator 28 (number of revolutions) and an electrical cable 29 connected to the stator 24 of the driving device. The speed regulator 28 enables the rotational speed of the impeller to be steplessly varied from 0-500 rpm (circa).
  • The invention is not restricted to the above described em­bodiment, but may be varied within the scope of the following claims. For example, the drive device can be provided with some form of cooling, for example a fan.

Claims (4)

1. Drive device for an impeller (17) which is rotatably mounted within a vessel (11) for stirring and mixing sterile fluids, and which device is located at an inwardly-directed cylindrical recess (15) in a bottom wall (16) of the vessel, the recess (15) being intended to receive the drive device, and which impeller (17) includes a peripheral section (21) which surrounds the cylindrical recess (15), characterised by a stator (24) fixedly secured in the recess (15), which stator includes a magnetisable iron core (25) and induction coils connected to a 3-phase a.c. source (26), and by inductively magnetisable elements (23) located in the peripheral section (21) of the impeller (17) for generating a torque when the stator (24) is supplied with a 3-phase alternating current so that the impeller rotates in a predetermined direction.
2. Device according to claim, 1 characterised in that the impeller is rotatably mounted on a stub axle (18) which is centrally located on an end wall (19) which demarcates the recess (15).
3. Device according to claim 1 or 2, characterised in that a small clearance is provided between the recess (15) and the peripheral section (21) of the impeller (17).
4. Device according to any one of the preceeding claims, characterised in that the magnetisable elements (23) are hermatically encased in the impeller (17).
EP90850179A 1989-05-26 1990-05-17 Drive device for an impeller for sterile applications Expired - Lifetime EP0399971B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8901876 1989-05-26
SE8901876A SE462834B (en) 1989-05-26 1989-05-26 DRIVING DEVICE FOR A MOVER, WHICH IS VOLTABLE STORED INTO A TANK FOR MOVING AND MIXING STERILE WASHERS

Publications (3)

Publication Number Publication Date
EP0399971A1 true EP0399971A1 (en) 1990-11-28
EP0399971B1 EP0399971B1 (en) 1994-08-03
EP0399971B2 EP0399971B2 (en) 1998-12-23

Family

ID=20376063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90850179A Expired - Lifetime EP0399971B2 (en) 1989-05-26 1990-05-17 Drive device for an impeller for sterile applications

Country Status (6)

Country Link
EP (1) EP0399971B2 (en)
AT (1) ATE109375T1 (en)
DE (1) DE69011213T3 (en)
FI (1) FI902470A0 (en)
NO (1) NO169756C (en)
SE (1) SE462834B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5478149A (en) * 1995-04-24 1995-12-26 Magnetic Mixers, Inc. Magnetic mixer
US5684712A (en) * 1991-10-23 1997-11-04 Cellpro, Inc. Apparatus and method for cell separation
US5758965A (en) * 1996-12-05 1998-06-02 General Signal Corporation Mixer system
US5779359A (en) * 1996-12-05 1998-07-14 General Signal Corporation Mixer having exposed clean-in-place bearing assemblies
US6065865A (en) * 1998-06-05 2000-05-23 Mixel Magnetically driven agitator with magnetic rotation detector
US6206562B1 (en) * 1998-01-28 2001-03-27 Mixel Agitator with adjustable magnetic drive coupling
US6543928B2 (en) * 2001-05-04 2003-04-08 General Machine Company Of New Jersey, Inc. Processing vessel and method for mixing powders with a magnetically coupled agitator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495895A (en) * 1945-10-31 1950-01-31 Universal Oil Prod Co Fluid circulating device
US2810556A (en) * 1955-03-14 1957-10-22 Tormag Transmissions Ltd Agitators for fluid cooling tanks and the like
DE1294936B (en) * 1964-03-03 1969-05-14 Teikoku Denki Seisakusho Kk Stirring device
GB2185862A (en) * 1985-12-11 1987-07-29 Chem Plant Stainless Limited Mixing vessel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495895A (en) * 1945-10-31 1950-01-31 Universal Oil Prod Co Fluid circulating device
US2810556A (en) * 1955-03-14 1957-10-22 Tormag Transmissions Ltd Agitators for fluid cooling tanks and the like
DE1294936B (en) * 1964-03-03 1969-05-14 Teikoku Denki Seisakusho Kk Stirring device
GB2185862A (en) * 1985-12-11 1987-07-29 Chem Plant Stainless Limited Mixing vessel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5684712A (en) * 1991-10-23 1997-11-04 Cellpro, Inc. Apparatus and method for cell separation
US5478149A (en) * 1995-04-24 1995-12-26 Magnetic Mixers, Inc. Magnetic mixer
US5758965A (en) * 1996-12-05 1998-06-02 General Signal Corporation Mixer system
US5779359A (en) * 1996-12-05 1998-07-14 General Signal Corporation Mixer having exposed clean-in-place bearing assemblies
US6206562B1 (en) * 1998-01-28 2001-03-27 Mixel Agitator with adjustable magnetic drive coupling
US6065865A (en) * 1998-06-05 2000-05-23 Mixel Magnetically driven agitator with magnetic rotation detector
US6543928B2 (en) * 2001-05-04 2003-04-08 General Machine Company Of New Jersey, Inc. Processing vessel and method for mixing powders with a magnetically coupled agitator

Also Published As

Publication number Publication date
DE69011213T3 (en) 1999-08-19
ATE109375T1 (en) 1994-08-15
DE69011213T2 (en) 1995-02-23
NO169756B (en) 1992-04-27
EP0399971B1 (en) 1994-08-03
NO902320L (en) 1990-11-27
SE8901876D0 (en) 1989-05-26
NO902320D0 (en) 1990-05-25
FI902470A0 (en) 1990-05-18
NO169756C (en) 1992-08-05
EP0399971B2 (en) 1998-12-23
DE69011213D1 (en) 1994-09-08
SE462834B (en) 1990-09-10

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