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Publication numberUS3689033 A
Publication typeGrant
Publication dateSep 5, 1972
Filing dateAug 10, 1970
Priority dateAug 10, 1970
Also published asDE2136472A1, DE2136472B2, DE2136472C3
Publication numberUS 3689033 A, US 3689033A, US-A-3689033, US3689033 A, US3689033A
InventorsHolmstrom Ola Ragnar, Lundin Kurt Ake
Original AssigneeLkb Produkter Ab
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Magnetic stirrer device
US 3689033 A
Abstract
A magnetic stirrer device comprising a transversally magnetized rod disposed in a mixing chamber and means for generating an alternating transversal magnetic field within the chamber so as to obtain a rotation of the rod and a stirring of the fluids in the chamber.
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Description  (OCR text may contain errors)

United States Patent Holmstrom et al.

- 1 Sept. 5, 1972 [54] MAGNETIC STIRRER DEVICE Sweden [73] Assignee: LKB-Produkter AB, Bromma,

Sweden [22] Filed: Aug. 10, 1970 [21] Appl. No.: 62,478

[52] US. Cl. ..259/5, 259/DIG. 46 [51] Int. Cl. ..B0lf 13/08 [58] Field of Search ..259/DlG. 46, 1 R, 5, 7, 9,

[56] References Cited UNlTED STATES PATENTS 3,219,318 11/1965 Hershler ..259/DIG. 46

3,167,669 l/l965 Bodine ..259/1 R X 2,999,673 9/1961 Kessler ..259/DIG. 46

FOREIGN PATENTS OR APPLICATIONS 991,941 6/1951 France ..259/DlG. 46

Primary Examiner-Walter A. Scheel Assistant ExaminerPhilip R. Coe Attorney-Christen and Sabol ABS'I RACT A magnetic stirrer device comprising a transversally magnetized rod disposed in a mixing chamber and means for generating an alternating transversal magnetic field within the chamber so as to obtain a rotation of the rod and a stirring of the fluids in the chamber.

6 Claims, 5 Drawing Figures MAGNETIC STIRRER DEVICE The invention relates to a magnetic stirrer device and more particularly to a stirrer device in which no motor is required for attaining a rotation of the magnetic stirrer.

Present day magnetic stirrer devices usually comprise a longitudinally magnetized rod, arranged in a mixing vessel. Under the vessel a similar magnet is arranged, this magnet being secured to the shaft of a motor so as to make it possible to rotate this magnet. This rotation then implies a corresponding rotation of the stirrer within the vessel. The advantages of such a magnetic stirrer in comparison with conventional mechanical stirrers is that no shafts have to be introduced into the mixing vessel and furthermore it is easy to change mixing vessels and appertaining stirrers without any time consuming cleaning procedure. The substantial drawbacks of the present day magnetic stirrers are that it is difficult to make the stirrer rotate if the volume of the vessel and consequently the stirrer is small and furthermore they can not be used for mixing streaming fluids when the axis of the stirrer has to be coaxial with the flow.

One object of this invention is to provide a magnetic stirrer device in which it is possible to use a very small mixing vessel.

Another object of the present invention is to provide a magnetic stirrer device in which the axis of the stirrer is coaxial with the stream of fluids to be mixed.

Another object of the invention is to provide a magnetic stirrer device which does not require a motor for rotating the stirrer.

The foregoing objects of the, invention will be apparent from the following detailed description when taken in conjunction with the drawing in which a preferred embodiment of the device according to the invention is shown and in which FIG. 1 is a cross sectional view of the device and FIG. 2 is an elevational view of part of the device of FIG. 1.

FIG. 3 is a top view of FIG. 2.

FIGS. 4 and 5 are elevational views of part of different embodiments of the device of this invention.

In the drawing ref. 1 denotes a cylindrical mixing chamber. The mixing chamber is provided with a magnetic stirrer 2 consisting of a transversally magnetized rod. The mixing chamber is secured between two pole pieces 5 and 6 by means of two ribbons 3 and 4, the ribbons for instance consisting of conventional O-rings. The pole pieces are attached to a magnetic core 7 provided with two coils 8 and 9 connected to an altemating voltage source 10, the source preferably consisting of an oscillator the frequency of which can be varied. By means of the alternating voltage source and the coils an alternating magnetic field is provided within the mixing chamber 1. This alternating magnetic field will imply a rotation of the stirrer 2 and by giving the stirrer a suitable shape a mixing will be obtained within the chamber. In order to obtain a good-mixing effect the stirrer is preferably provided with vanes 11 which could either be part of the magnetic rod or be formed by a cover of the rod. This cover could for instance consist of a thin layer of tetrafluor ethylene (Teflon) which is welded at the ends of the rod in such a way that a vane isobhaind at each end of the rod. A top view of rod 2 is s own in FIG. 3 which illustrates vanes mounted on the ends of rod 2. One end of the chamber is then connected to a supplying hose 12 and the opposite end is connected to a discharging hose 13. The supplying hose is for instance connected to a junction 14 to which the different fluids to be mixed are supplied either simultaneously or alternatively.

Although only one embodiment of the invention has been described in detail above it should be understood that various changes can be carried out without departing from the spirit or scope of the invention. Thus the number of pole pieces spaced around the chamber might of course be increased as well as the number of differentially magnetized segments of the stirrer. Furthermore different shapes of the rod or the layer with which it is covered are possible. Thus a pumping effect could be obtained e.g. by having a screw shaped outer surface of the rod or by providing the rod with a bore. In FIG. 4 magnetic stirrer 15 consists of transversally magnetized rod 16 and screw shaped outer surface 17. In FIG. 17 magnetic stirrer 18 consists of transversally magnetized rod 19 and bore 20.

What is claimed is:

1. Magnetic stirrer device for stirring a liquid flow, said device comprising a tubular mixing chamber which is coaxial with said flow, a feed means for supplying the components of said flow to one end of said tubular mixing chamber, a discharge means for discharging said flow from the other end of said tubular mixing chamber, a magnetic stirrer located in said tubular mixing chamber and formed by a transversally magnetized rod which is coaxial with said chamber, and means outside of said chamber for generating an alternating magnetic field in said chamber so as to rotate said magnetic stirrer around an axis parallel to the longitudinal axis of said tubular mixing chamber.

2. The device of claim 1 wherein said alternating magnetic field generating means comprises an oscillator connected to coils on a magnetic core, the pole pieces of said core being spaced around said chamber, and said oscillator having an adjustable frequency, and wherein only one transversally magnetized rod is used.

3. The device of claim 1 wherein said transversally magnetized rod is provided on each end with a protrusion.

4. The device of claim 3 wherein said protrusions on each end of said transversally magnetized rod are vanes.

5. The device of claim 1 wherein the transversally magnetized rod has a screw shaped outer surface.

6. The device of claim 1 wherein the transversally magnetized rod is a bored rod.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2999673 *Aug 5, 1959Sep 12, 1961Technicon InstrLiquid mixing means
US3167669 *Oct 10, 1961Jan 26, 1965Bodine Jr Albert GElectromagnetic rotary field apparatus for generating and applying gyratory sonic vibrations
US3219318 *Aug 22, 1961Nov 23, 1965Hershler AbeFluid treating method and apparatus
FR991941A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3905583 *Nov 9, 1973Sep 16, 1975Cellophane SaMethod and device for the fabrication of improved plastic and cellulose films
US3907258 *Nov 12, 1973Sep 23, 1975Orion ResearchApparatus for mixing fluids on stream
US3995835 *Jul 8, 1974Dec 7, 1976Owens-Illinois, Inc.Magnetic mixer
US4054270 *Mar 30, 1976Oct 18, 1977The United States Of America As Represented By The Secretary Of AgricultureMicro mixing apparatus and method
US4611615 *Nov 2, 1983Sep 16, 1986Petrovic Ljubisa MFluid treatment apparatus and method
US4767218 *May 4, 1987Aug 30, 1988Stoelting, Inc.Mixing paddle assembly
US4830511 *Apr 5, 1988May 16, 1989The Coca-Cola CompanyPostmix juice dispensing system
US5040898 *Mar 1, 1988Aug 20, 1991Ionode Pty. Ltd.Fluid stream
US5556654 *May 26, 1993Sep 17, 1996Fregeau; Leo J.Magnet beverage treatment
US5911503 *Apr 11, 1997Jun 15, 1999Bayer AktiengesellschaftChemical reactor with magnetic stirring device
US6416215 *Dec 14, 1999Jul 9, 2002University Of Kentucky Research FoundationPumping or mixing system using a levitating magnetic element
US6758593Nov 28, 2000Jul 6, 2004Levtech, Inc.Pumping or mixing system using a levitating magnetic element, related system components, and related methods
US6899454 *Jun 9, 2004May 31, 2005Levtech, Inc.Set-up kit for a pumping or mixing system using a levitating magnetic element
US7086778Oct 9, 2001Aug 8, 2006Levtech, Inc.Pumping or mixing a fluid using a levitating, rotating pumping or mixing element and various other components for use in a pumping or mixing system are disclosed. The pumping or mixing element is placed in a fluid-containing vessels
WO1998006485A1 *Aug 8, 1997Feb 19, 1998Genex LimitedAgitation apparatus
Classifications
U.S. Classification366/273, 366/279, 366/318
International ClassificationB01F13/08, B01F15/00, B01F13/00
Cooperative ClassificationB01F15/00123, B01F13/0818
European ClassificationB01F13/08C