EP0124970A2 - Magnetrührer und Rührverfahren - Google Patents
Magnetrührer und Rührverfahren Download PDFInfo
- Publication number
- EP0124970A2 EP0124970A2 EP84301536A EP84301536A EP0124970A2 EP 0124970 A2 EP0124970 A2 EP 0124970A2 EP 84301536 A EP84301536 A EP 84301536A EP 84301536 A EP84301536 A EP 84301536A EP 0124970 A2 EP0124970 A2 EP 0124970A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- chamber
- fluid
- buoyant
- magnetic
- 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- Withdrawn
Links
- 238000003760 magnetic stirring Methods 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 title claims description 3
- 239000012530 fluid Substances 0.000 claims abstract description 23
- 230000005291 magnetic effect Effects 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 8
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000006249 magnetic particle Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000012258 culturing Methods 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 238000004113 cell culture Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B01F33/452—Magnetic mixers; Mixers with magnetically driven stirrers using independent floating stirring elements
Definitions
- the present invention relates to an apparatus and method for stirring fluids with a magnetic impeller, and more particularly, a novel buoyant magnetic impeller which can be used to stir fluids as well as suspended solids.
- U.S. 4,310,253 to Sada et al. discloses magnetic particles which are covered with a material less dense than the fluid the particles are to stir, e.g., paraffin. The result is a mat of floating magnetic particles which stirs a fluid when subjected to a rotating magnetic field.
- the present invention provides an improved magnetic stirring apparatus capable of suspending solids in a liquid medium with a minimum of shear force. It is particularly useful in suspended microcarrier cell culture, where low shear forces and low revolution per minute (RPM) operation are desirable.
- RPM revolution per minute
- a magnetic stirring apparatus capable of suspending solids in a liquid medium, comprising a vessel for containing fluids and solids, having walls, a bottom, and an opening; a magnetic impeller; and a means for rotating the magnetic impeller; characterized in that the impeller comprises a chamber which is buoyant with respect to the fluid contained by the vessel, and a magnet placed within the buoyancy chamber thereby forming a buoyant magentic impeller.
- the invention provides an effective, yet inexpensive stirrer.
- the need for a stirrer shaft and bearing is eliminated by the use of a buoyant magentic impeller wherein the magnet is placed inside a buoyant chamber.
- This is different from the coated, comminuted magnetic particles in the prior art.
- the present impeller has a space between the magnet and the chamber walls for buoyancy.
- the magnet is not coated with a buoyant composition, and need not have a chamber made from buoyant materials.
- buoyancy of the impeller can be adjusted by changing the density of fluid in the space between the magnet and the chamber walls. For example, if the chamber is filled with a liquid alkane it would be more buoyant in water than if it was filled with benzene. Thus, the depth of the impeller in the fluid to be stirred can be controlled.
- the present invention comprises, as shown in Figure 1, with a buoyant magnetic impell'er 10 having a buoyancy chamber 12 and a magnet 14.
- the chamber is dimensioned and configured to allow placement of the magnet within the chamber as well as to provide a buoyancy space 16 about the magnet.
- impeller blade 20 Attached to the outside of the chamber wall adjacent to and extending away from the magnet is a optional impeller blade 20 (see Figure 3).
- This blade has a negative buoyancy such that when the impeller is placed into a stirring vessel 22 containing a fluid 24, the blade extends downwardly into the fluid. Impeller movement arises from a conventional rotating means 26 which provides a rotating magnetic field.
- the impeller-to-bottom-wall clearance can be adjusted without relying on bearings and shafts.
- detachable impeller blades of varying weight can be used to compensate for fluids of diverse densities.
- the chamber space can be filled with a material, which can be solid, liquid, or gas. In fact, the chamber space could even be evacuated.
- Suspension cell culturing can put high demands on a stirrer, i.e., low speed operation, minimal fluid shearing, and adequate clearance to avoid cell grinding.
- the present invention excels in all these areas. Without bearings and shafts, and correctly adjusted in height, cell abrasion is eliminated. When submerged in a suspension, preferably to about two thirds of the chamber height, low speed suspension without shear is a reality.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US49255983A | 1983-05-09 | 1983-05-09 | |
US492559 | 2000-01-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0124970A2 true EP0124970A2 (de) | 1984-11-14 |
EP0124970A3 EP0124970A3 (de) | 1986-06-04 |
Family
ID=23956741
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84301536A Withdrawn EP0124970A3 (de) | 1983-05-09 | 1984-03-08 | Magnetrührer und Rührverfahren |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0124970A3 (de) |
JP (1) | JPS59206034A (de) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2178971A (en) * | 1985-08-08 | 1987-02-25 | Techne Inc | Floating magnetic stirrer for culture medium |
EP0259002A2 (de) * | 1986-09-04 | 1988-03-09 | Techne, Inc. | Magnetmischer mit verbesserter Mischung |
US6733171B2 (en) * | 2000-09-13 | 2004-05-11 | Levitronix Llc | Magnetic stirring apparatus and an agitating device |
EP1539335A2 (de) * | 2002-07-03 | 2005-06-15 | Bio/Data Corporation | VORRICHTUNG UND VERFAHREN ZUR VERWENDUNG VON VERTIKALEM MAGNETISCHEM R HREN ZUR ERZEUGUNG VON TURBULENTEM UND CHAOTISCHEM MISCHEN IN VERSCHIEDENEN STADIEN OHNE BEEINTRûCHTIGUNG VON KOMPONENTEN |
KR100747935B1 (ko) * | 2004-12-22 | 2007-08-08 | 지이 메디컬 시스템즈 글로발 테크놀러지 캄파니 엘엘씨 | 코일 소자 선택 방법 및 자기 공명 촬영 장치 |
CN110665412A (zh) * | 2019-11-20 | 2020-01-10 | 武汉医尔特科技有限公司 | 一种用于液体混匀的搅拌保温装置 |
CN114377599A (zh) * | 2022-01-13 | 2022-04-22 | 青岛花帝食品配料有限公司 | 一种用于甜味香精制备的配料装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2444328A1 (de) * | 1974-09-17 | 1976-03-25 | Wolfgang Gruhn | Verfahren zur bewegung von fluessigkeiten, gasen, granulaten oder staeuben, sowie zum antrieb leistungsarmer geraete mittels elektromagnetisch fererregter rotationsoder schwingkoerper |
US4162855A (en) * | 1974-11-18 | 1979-07-31 | Spectroderm International, Inc. | Magnetic stirrer apparatus |
FR2449473A1 (fr) * | 1979-01-25 | 1980-09-19 | Jeanmougin Michel | Dispositif permettant l'agitation d'un milieu fluide |
EP0105574A2 (de) * | 1982-06-09 | 1984-04-18 | Techne Incorporated | Schwimmender Magnetrührer für Kulturen |
-
1984
- 1984-03-01 JP JP59039702A patent/JPS59206034A/ja active Pending
- 1984-03-08 EP EP84301536A patent/EP0124970A3/de not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2444328A1 (de) * | 1974-09-17 | 1976-03-25 | Wolfgang Gruhn | Verfahren zur bewegung von fluessigkeiten, gasen, granulaten oder staeuben, sowie zum antrieb leistungsarmer geraete mittels elektromagnetisch fererregter rotationsoder schwingkoerper |
US4162855A (en) * | 1974-11-18 | 1979-07-31 | Spectroderm International, Inc. | Magnetic stirrer apparatus |
FR2449473A1 (fr) * | 1979-01-25 | 1980-09-19 | Jeanmougin Michel | Dispositif permettant l'agitation d'un milieu fluide |
EP0105574A2 (de) * | 1982-06-09 | 1984-04-18 | Techne Incorporated | Schwimmender Magnetrührer für Kulturen |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2178971A (en) * | 1985-08-08 | 1987-02-25 | Techne Inc | Floating magnetic stirrer for culture medium |
EP0259002A2 (de) * | 1986-09-04 | 1988-03-09 | Techne, Inc. | Magnetmischer mit verbesserter Mischung |
EP0259002A3 (de) * | 1986-09-04 | 1989-09-20 | Techne, Inc. | Magnetmischer mit verbesserter Mischung |
US6733171B2 (en) * | 2000-09-13 | 2004-05-11 | Levitronix Llc | Magnetic stirring apparatus and an agitating device |
EP1539335A2 (de) * | 2002-07-03 | 2005-06-15 | Bio/Data Corporation | VORRICHTUNG UND VERFAHREN ZUR VERWENDUNG VON VERTIKALEM MAGNETISCHEM R HREN ZUR ERZEUGUNG VON TURBULENTEM UND CHAOTISCHEM MISCHEN IN VERSCHIEDENEN STADIEN OHNE BEEINTRûCHTIGUNG VON KOMPONENTEN |
EP1539335A4 (de) * | 2002-07-03 | 2007-04-04 | Bio Data Corp | VORRICHTUNG UND VERFAHREN ZUR VERWENDUNG VON VERTIKALEM MAGNETISCHEM R HREN ZUR ERZEUGUNG VON TURBULENTEM UND CHAOTISCHEM MISCHEN IN VERSCHIEDENEN STADIEN OHNE BEEINTRûCHTIGUNG VON KOMPONENTEN |
US7364350B2 (en) | 2002-07-03 | 2008-04-29 | Bio/Data Corporation | Method and apparatus for using vertical magnetic stirring to produce turbulent and chaotic mixing in various states, without compromising components |
KR100747935B1 (ko) * | 2004-12-22 | 2007-08-08 | 지이 메디컬 시스템즈 글로발 테크놀러지 캄파니 엘엘씨 | 코일 소자 선택 방법 및 자기 공명 촬영 장치 |
CN110665412A (zh) * | 2019-11-20 | 2020-01-10 | 武汉医尔特科技有限公司 | 一种用于液体混匀的搅拌保温装置 |
CN114377599A (zh) * | 2022-01-13 | 2022-04-22 | 青岛花帝食品配料有限公司 | 一种用于甜味香精制备的配料装置 |
CN114377599B (zh) * | 2022-01-13 | 2023-03-03 | 青岛花帝食品配料有限公司 | 一种用于甜味香精制备的配料装置 |
Also Published As
Publication number | Publication date |
---|---|
EP0124970A3 (de) | 1986-06-04 |
JPS59206034A (ja) | 1984-11-21 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Designated state(s): BE DE FR GB IT SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
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AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE DE FR GB IT SE |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19861205 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: RAMSEY, WILLIAM SCOTT Inventor name: HERTL, WILLIAM |