• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Magnetic coupling (1) for torque transmission along a rotational axis (4), with two relatively rotatable coupling parts (5, 6), wherein a drive-side coupling part (5) has a drive-side permanent magnet (10) and a driven-side coupling part (6) has a drive-side permanent magnet (10) along the axis of rotation (4) opposite and spaced therefrom the driven side permanent magnet (7), wherein one of the coupling parts (5; 6) comprises an at least partially ferromagnetic Umleitelement (8) which with the permanent magnet (10; a part of the diverting element (8) is arranged radially outside of the opposite permanent magnet (7, 10).
    公开号:AT515555A4
    申请号:T50343/2014
    申请日:2014-05-15
    公开日:2015-10-15
    发明作者:Christoph Dipl Ing Janeczek；Markus Dipl Ing Hinteregger
    申请人:Tech Universität Wien；
    IPC主号:
    专利说明:

    The invention relates to a magnetic coupling for
    Torque transmission along a rotation axis, with two relatively rotatable coupling parts, wherein a drive-side coupling part has a drive-side permanent magnet and a driven-side coupling part has a drive-side permanent magnet along the axis of rotation opposite and arranged at a distance therefrom permanent magnet output side. In particular, the invention relates to a compact magnetic coupling between separate functional areas without housing passage.
    This design is essentially the same as the type of magnetic coupling commonly known as a top-rotary joint. Characteristic of this type of coupling are the axially adjacent, often mirror-inverted, permanent magnets of the two coupling parts. As a rule, the two coupling parts are separated by a plane separating surface which is perpendicular to the axis of rotation. A known alternative to this type of coupling is the central rotary coupling, which has two coaxial nested hollow cylindrical coupling parts. The basic structure of both types of coupling can be found, for example, in EP 0 039 777 A2. Central swivel couplings have the advantage of better torque transmission, but with increasing miniaturization due to the necessary thin-walled hollow cylindrical coupling parts and corresponding flat permanent magnets difficult and expensive to produce. On the other hand, face rotors with a reduction in size show a disproportionate deterioration of the torque transmission, i. with smaller coupling dimensions, not only does the available magnetized volume decrease, but so does the radius that is critical to the transmitted torque.
    One possible field of application of the magnetic coupling according to the invention, in which small dimensions of the coupling are particularly desirable, is in particular the use as an implanted medical device, in particular as a blood pump, preferably as a cardiac blood pump or as a cardiac catheter pump. Such a blood pump is already known from EP 0 904 117 B1, wherein the magnetic coupling shown there between the drive and the pump rotor is designed in a manner known per se as a front-end rotary coupling.
    Compared to the known designs, it is an object of the invention to propose a magnetic coupling, which in a given, particularly compact dimensions on the one hand simpler and cheaper to produce than comparable central rotary joints and on the other hand compared to conventional Stirndrehkupplungen increased efficiency in terms of transmitted torque.
    This object is achieved according to the invention in a magnetic coupling of the type mentioned in the introduction, in that one of the coupling parts comprises an at least partially ferromagnetic Umleitelement which is rotatably connected to the permanent magnet of the coupling part, wherein a part of the Umutelements radially outwardly of the opposite permanent magnet is arranged. The diverting element can -comparably the pot-shaped outer coupling part of a central rotary coupling- or hollow cylinder-shaped and surround the respective other coupling part circumferentially, i. it preferably extends radially outward of both permanent magnets. The deflection element can then be designed, for example, as a thin-walled hollow cylinder, so that the magnetized volume of the face rotary coupling remains largely unchanged while at the same time a transferable torque comparable to a central rotation coupling can be achieved between the circulation element and the permanent magnet located at a distance therefrom. The
    The direction of magnetization of the permanent magnets is preferably perpendicular to the axis of rotation, i. the magnetic poles run circumferentially from south to north and, in any case in a two-pole design, are diametrically opposed to the axis of rotation. The diverter radially bundles magnetic field lines emanating from the permanent magnets and additionally strengthens the magnetic force between the coupling parts due to the ferromagnetic material of the diverter element. The compression of the magnetic field lines in the ferromagnetic material increases the magnetic force for transmitting the torque. Because of the larger volume of permanent magnets compared to central rotating couplings with the same coupling dimensions, advantageously, a smaller axial extent and thus lower radial shear forces on the bearings of the coupling parts can be achieved.
    A compact manufacture of the magnetic coupling with a simultaneously comparatively good torque transmission capability can be achieved if the two permanent magnets are each 2, 4 or β-pole permanent magnets. In order to optimize the transmission capability of the torque of the magnetic coupling, in particular, depending on the diameter of the coupling, the respective polarity number for both magnets will be determined. With relatively large magnetic clutches, a higher number of poles is also possible. In the case of the 2-pole configuration, the permanent magnets may each have two semi-cylindrical magnetic poles.
    In order to avoid a magnetic short circuit in the bypass element, the bypass element may have at least one diamagnetic separation which divides the bypass element into at least two-ferromagnetic sections. In the case of a two-pole permanent magnet, the separation may be carried out as a diamagnetic separating strip along a plane intersecting the permanent magnet centrally and transverse to the magnetization direction, i.e. the separating strip divides the diverting element into two halves.
    When the diverting element extends to a rear side of the non-rotatably connected permanent magnet facing away from the opposite permanent magnet, the magnetization of the diverting element and thus the transmittable torque can be additionally increased.
    Moreover, it has turned out to be favorable if that
    Diverter having a hollow cylindrical shell and is preferably formed with a arranged at substantially half the height of the shell intermediate bottom. In this case, the diverting element has a substantially H-shaped longitudinal section, wherein the intermediate bottom forms the transverse web lying perpendicular to the axis of rotation, so that cup-shaped recesses are formed on both sides of the intermediate bottom. In one of these recesses, a permanent magnet is accommodated and connected rotationally fixed.
    A particularly high concentration of magnetic field lines in the guide element can be achieved if a diamagnetic shielding element is arranged on a rear side of the permanent magnet, which is turned against rotation with respect to the bypass element, facing away from the opposite permanent magnet. This avoids field lines running outside the coupling parts and reduces associated losses.
    Furthermore, it has been found to be favorable if a permanent magnet, which is non-rotatably connected to the diverting element, is arranged on a permanent magnet opposite front side, in particular in a region centered around the axis of rotation, a magnetic shielding element which preferably adjoins the diverting element on the circumference or radially on the outside. With such a shielding, a deflection of the magnetic field can be achieved in regions located radially at a greater distance from the axis of rotation, so that the torque transmitted at a given magnetic force is increased. For torque transmission between separate functional areas, e.g. in pump applications with a pump rotor mounted in the pumping medium, it is beneficial if the two coupling parts are hermetically separated. Such a hermetic separation can be achieved, for example, by a hermetic wall between the two coupling parts, which wall should be either magnetically or electrically conductive. This does not necessarily have to be part of a housing of the coupling, but may for example be connected to a housing. In principle, however, the present magnetic coupling can also be used without hermetic separation, for example for safety couplings, i. to limit the transmitted torque.
    In the context of a hermetic separation of the coupling parts, it is advantageous if the hermetic separation of the two coupling parts of at least one of the coupling parts is accommodated in a substantially non-magnetic and electrically non-conductive housing. With such a housing, losses due to re-magnetization of the housing or induced eddy currents in the housing can be avoided.
    The present magnetic coupling can be used particularly advantageously in a pump with a drive and a pump rotor, wherein the pump rotor is connected to the drive via the magnetic coupling. The pump obtained in this way can be made particularly compact, while at the same time transmitting a relatively high torque with a correspondingly advantageous pumping power.
    One use requiring particularly compact pump dimensions relates to implanted medical devices, particularly blood pumps, preferably cardiac blood pumps. At the same time a hermetic separation of the drive from the pump rotor is advantageous, at the same time the highest possible torque is to be transmitted. These requirements are met particularly well by the magnetic coupling proposed here.
    The invention will now be further elucidated by means of particularly preferred embodiments, to which it should not be limited, and with reference to the drawings. The drawings show in detail:
    Figure 1 is a perspective view of a magnetic coupling for transmitting a torque with a reverse frustoconical beveled Umleitelement.
    2 shows a longitudinal section through a magnetic coupling according to FIG. 1, wherein the two coupling parts are separated by a housing;
    Fig. 3 is a side view of a rear side of the drive-side coupling part according to Fig. 1 and Fig. 2, but without housing;
    4 is a longitudinal section through a variant of the magnetic coupling according to FIG. 2 with a diamagnetic shielding element on a front side of the drive-side coupling part;
    Fig. 5 is a perspective view of a variant of a magnetic coupling for transmitting torque to a diverter without a rear frusto-conical taper of the diverter;
    6 shows a longitudinal section through a magnetic coupling according to FIG. 5, wherein the two coupling parts are separated by a housing and with a diamagnetic shielding at a back of the drive-side coupling part;
    7 shows a side view of a rear side of the drive-side coupling part according to FIG. 5 and FIG. 6 without a housing;
    8 shows a longitudinal section through a magnetic coupling according to FIG. 5, wherein the diverting element has an intermediate bottom, which is arranged on a front side of the drive-side coupling part and with a diamagnetic shield at the rear side;
    9 shows a side view of a rear side of the drive-side coupling part according to FIG. 5 and FIG. 8 without a housing;
    10 is a longitudinal section through a magnetic coupling according to FIG. 8, wherein the diamagnetic shield is replaced by a ferromagnetic ground; and
    11 is a side view of a rear side of the drive-side coupling part according to FIG. 5 and FIG. 10 without a housing.
    In Fig. 1, a magnetic coupling 1 is shown, which connects a drive shaft 2 with an output shaft 3 for non-contact transmission of a torque Μ, M '. The two shafts 2, 3 lie on a common axis of rotation 4, so that a drive-side coupling part 5 is rotatably mounted relative to a driven-side coupling part 6. Derabtriebsseitige coupling part 6 comprises a driven side two-pole permanent magnet 7, which is rotatably connected to the Abtriebswelle 3, in particular mounted on the Abtriebswelle 3 (see Fig. 2). The driven-side permanent magnet 7 is peripherally surrounded by a substantially cup-shaped diverting element 8 with a hollow cylindrical shell 8 'and a disc-shaped, substantially flat bottom 8' '(see Fig. 2) which terminates the shell 8' at one end. In this case, a clearance or gap is provided between the driven-side permanent magnet 7 and the diverting element 8, so that the output-side coupling part 6 is coupled without contact with the drive-side coupling part 5. The diverting element 8 consists largely of ferromagnetic material. The jacket 8 'of the diverter 8 is interrupted only in a narrow angular range by diamagnetic separation 9 and the partition 9 also extends across the bottom 8 ". The partition 9 divides the diverting element 8 substantially into two-ferromagnetic halves. A cutting plane passing through the partition 9 is thus perpendicular to a magnetization direction of the driving-side two-pole permanent magnet 10 connected to the bypassing member 8 (see Fig. 2). The ferromagnetic portions 11, 12 of the bypass element 8 are therefore magnetized corresponding to the drive-side permanent magnet 10. In the case of multi-pole permanent magnets 7, 10, corresponding additional separations would be required in the bypass element 8 to allow optimum magnetization of the bypass element 8. The drive-side truncated cone-shaped chamfer 13 of the diverting element 8 achieves as homogeneous a magnetic field gradient as possible in the diverting element 8, or any magnetization losses caused by inhomogeneities at the edges are reduced.
    In Fig. 2, the magnetic coupling 1 shown in Fig. 1 is shown in longitudinal section, wherein additionally the drive-side coupling part 5 through a housing 14 from the output side
    Coupling part 6 is disconnected. The housing 14 forms a hermetic separation between the functional areas of the two coupling parts 5, 6. The drive-side coupling part 5 with the drive side permanent magnet 10 and the Umleitelement 8 is rotatably received in the housing 14, the housing 14 of the cup-shaped recess in the bypass 8 approximately to a front side 15 of the drive side Permanent magnet 10 follows and itself forms a correspondingly smaller pot-shaped recess 16 for receiving the driven-side coupling part 6. Naturally, since the inner diameter of the skirt 8 'of the diverting member 8 is larger than the outer diameter of the opposing coupling member 6 rotatably disposed therein, and the permanent magnet 7 at the same time as the permanent magnet 10 of the coupling member 5 connected to the diverting member 8 advantageously radially completely fills the shell 8', its outer diameter is generally Through the bottom 8 "of the ferromagnetic material diverter 8, any field lines exiting to the back of the permanent magnet 10 are redirected to the front side via the diverter 8, thereby contributing to torque transmission. As further shown in FIG. 2, the two permanent magnets 7, 10 are plugged onto the respective associated shafts 3, 2 or through the shafts 3, 2 along the axis of rotation 4.
    In Fig. 3, the magnetic coupling 1 is shown facing the bottom 8 "of the diverting element 8, the diamagnetic separation 9 running across the bottom 8", which divides the bottom 8 "into two semicircular halves, can be seen.
    FIG. 4 shows a variant of the magnetic coupling 1 expanded with respect to FIG. 2, wherein the front side 15 of the permanent magnet 10 connected to the bypass element 8 is provided with adiamagnetic shielding element 17. By the shielding member 17, a conclusion of the magnetic field lines between the two permanent magnets 7, 10 at low radii, i. This counteracts a shift in the effective magnetic force to larger radii, in particular the bypass element 8, and thus a more efficient transmission of torque.
    In the variants of the magnetic coupling 1 described below, which correspond to the perspective view shown in FIG. 5, in contrast to FIG. 1, by design, no frustoconical taper is provided on the rear side of the diverting element 8. Otherwise, the basic structure is identical to the magnetic coupling 1 shown in Fig. 1.
    6 and 7, a variant of the magnetic coupling 1 is shown in which the ferromagnetic base 8 '' of the redirecting element 8 (see Figures 2 and 4) is replaced by a diamagnetic shielding element 18 on the rear side 19 of the permanent magnet 10 connected to the diverting element 8 is. By the shielding element 18 back exiting field lines of the magnetic field between the permanent magnets 7, 10 of the two coupling parts 5, 6 are avoided, so that a correspondingly higher magnetic field is achieved at the outside and front. A separation 9 as with the ferromagnetic ground 8 "(see Fig. 3) is not required in the shielding element 18. For fixing the shielding member 18 in the diverting member 8, the skirt 8 'of the diverting member 8 has a taper 20 at the closed end into which the shielding member 18 is fitted. The jacket 8 'consequently surrounds both the permanent magnet 10, which is connected in a rotationally fixed manner, and the opposite permanent magnet 7 and the shielding element 18.
    A further alternative embodiment of the magnetic coupling 1is shown in FIGS. 8 and 9, wherein the diverting element 8 has here instead of the bottom 8 "an intermediate bottom 21 approximately at half the height of the jacket 8 '. The intermediate bottom 21 has - again bottom 8 '' (see Fig. 3) - a transverse to the axis of rotation 4 extending separating strip 22. On both sides of the intermediate floor 21, the diverting element 8 thus forms cup-shaped recesses 23,24, wherein in the drive-side recess 23 of the drive-side permanent magnet 10 and thereafter einscheibenförmiges diamagnetic shielding element 25 is received and rotatably connected. Corresponding to the variant of the magnetic coupling 1 shown in FIG. 6, the variant according to FIG. 8 offers a better dimensional stability of the bypass element 8 and thus a higher mechanical load capacity of the magnetic coupling 1 in terms of production.
    The variant of the magnetic coupling 1 shown in FIGS. 10 and 11 essentially corresponds to the embodiment shown in FIGS. 8 and 9, wherein instead of the diamagnetic shielding element 25, a ferromagnetic bottom 26 compares with the bottom 8 * 'of the diverting element 8 according to FIGS. 2 and 3 in the drive-side recess 23 is used. The bottom 26 used expediently likewise has a diamagnetic separating strip 27, which divides the bottom 26 into two semicircular halves and thus prevents a closure of the magnetic circuit between the two poles of the permanent magnet 10 via the rear side of the coupling part 5.
    权利要求:
    Claims (11)
    [1]
    Claims 1. A magnetic coupling (1) for transmitting torque along an axis of rotation (4) with two relatively rotatable coupling parts (5, 6), wherein a drive-side coupling part (5) has a drive-side permanent magnet (10) and a driven-side coupling part (6) drive permanent magnet (10) along the axis of rotation (4) opposite and spaced therefrom the driven side permanent magnet (7), characterized in that one of the coupling parts (5; 6) comprises an at least partially ferromagnetic rerouting element (8) connected to the permanent magnet (10; ) of the coupling part (5; 6) is non-rotatably connected, wherein a part of the bypass element (8) is arranged radially outside the opposite permanent magnet (7; 10).
    [2]
    2. Magnetic coupling (1) according to claim 1, characterized in that the two permanent magnets (10, 7) are each 2-, 4-, or 6-pole permanent magnets.
    [3]
    3. Magnetic coupling (1) according to claim 1 or 2, characterized in that the diverting element (8) has at least one diamagnetic separation (9) which divides the diverting element (8) into at least two ferromagnetic sections (11, 12).
    [4]
    4. Magnetic coupling (1) according to one of claims 1 to 3, characterized in that the diverting element (8) on a opposite permanent magnet (7; 10) facing away from back (19) of the non-rotatably connected permanent magnet (10; 7).
    [5]
    5. Magnetic coupling (1) according to any one of claims 1 to 4, characterized in that the diverting element (8) has a hollow cylindrical jacket (8 ') and is preferably formed with a substantially half the height of the jacket (8') arranged intermediate bottom (21) ,
    [6]
    6. Magnetic coupling (1) according to one of claims 1 to 5, characterized in that on a the opposite permanent magnet (7) facing away from the rear side (19) of the rotatable test element (8) connected to the permanent magnet (10) one-magnetic shielding (18, 25) is arranged.
    [7]
    Magnetic coupling (1) according to any one of claims 1 to 6, characterized in that a permanent magnet (10) connected to the permanent magnet (7) facing the permanent magnet (7) rotates with the revolving element (8), in particular in one about the axis of rotation (4) ) centered area, a magnetic shielding element (17) is arranged, which preferably peripherally adjoins the diverting element (8).
    [8]
    8. Magnetic coupling (1) according to one of claims 1 to 7, characterized in that the two coupling parts (5, 6) are hermetically separated.
    [9]
    9. Magnetic coupling (1) according to claim 8, characterized in that for the hermetic separation of the two coupling parts at least one of the coupling parts (5, 6) is housed in a substantially non-magnetic and non-electrically conductive housing (14).
    [10]
    A pump having a drive and a pump rotor, the pump rotor being connected to the drive via a magnetic coupling (1) according to any one of claims 1 to 9.
    [11]
    11. Use of a pump according to claim 10 as a medical device, in particular as an implanted blood pump, preferably as a cardiac blood pump.
    类似技术:
    公开号 | 公开日 | 专利标题
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    DE2048286B2|1975-08-28|Centrifugal pump with magnetic gear
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    DE3209663C2|1990-11-15|
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    DE3831068A1|1990-03-22|METHOD FOR CLEANING A FABRIC-FREE, ROTATING WORKING CONVEYOR FOR FLUIDS
    EP0779699B1|1999-03-03|Magnetic coupling for a centrifugal pump
    DE102013105964A1|2014-12-11|Rotor with bearing device
    DE102015000634B3|2016-03-31|Rotary lock, in particular for a rotational flow in the gap pot bottom region of a magnetic coupling pump
    同族专利:
    公开号 | 公开日
    US20170080136A1|2017-03-23|
    JP2017515552A|2017-06-15|
    WO2015172173A2|2015-11-19|
    ES2660427T3|2018-03-22|
    EP3143682B1|2018-01-31|
    US10704553B2|2020-07-07|
    EP3143682A2|2017-03-22|
    WO2015172173A3|2015-12-30|
    AT515555B1|2015-10-15|
    JP6584015B2|2019-10-02|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0039777A2|1980-05-13|1981-11-18|Thyssen Edelstahlwerke AG|Synchronous coupling|
    EP0904117B1|1996-04-04|2000-07-12|Impella Cardiotechnik Aktiengesellschaft|Intravascular blood pump|
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    JP2009121676A|2007-10-26|2009-06-04|Denso Corp|Power transmitter|
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    US9362812B2|2012-09-18|2016-06-07|Honeywell International Inc.|Shaft coupling apparatus, rotary fluid damper, and deployable device with magnetic coupling mechanism|US10905813B2|2015-10-14|2021-02-02|CCORE Technology GmbH|Membrane catheter|
    US10709827B2|2015-10-14|2020-07-14|Technische Universität Wien|Membrane catheter|
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    JP2021511894A|2018-02-01|2021-05-13|シファメド・ホールディングス・エルエルシー|Intravascular blood pump and method of use and manufacture|
    DE102018207594A1|2018-05-16|2019-11-21|Kardion Gmbh|Rotor, magnetic coupling device, electric motor for a cardiac assist system, pump unit for a cardiac assist system and method for manufacturing a rotor|
    DE102018207622A1|2018-05-16|2019-11-21|Kardion Gmbh|Permanent magnetic radial rotary coupling and micropump with such a radial rotary coupling|
    KR102276578B1|2020-12-24|2021-07-13|주식회사 태영팬가드|Non-contact no-load power transmit device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50343/2014A|AT515555B1|2014-05-15|2014-05-15|magnetic coupling|ATA50343/2014A| AT515555B1|2014-05-15|2014-05-15|magnetic coupling|
    US15/311,300| US10704553B2|2014-05-15|2015-05-13|Magnetic coupling|
    EP15728385.4A| EP3143682B1|2014-05-15|2015-05-13|Magnetic coupling|
    JP2016564123A| JP6584015B2|2014-05-15|2015-05-13|Magnetic coupling|
    PCT/AT2015/050122| WO2015172173A2|2014-05-15|2015-05-13|Magnetic coupling|
    ES15728385.4T| ES2660427T3|2014-05-15|2015-05-13|Magnetic clutch|
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