CA2848130A1 - Containment shell for a magnetic coupling with improved fluid flow - Google Patents
Containment shell for a magnetic coupling with improved fluid flow Download PDFInfo
- Publication number
- CA2848130A1 CA2848130A1 CA2848130A CA2848130A CA2848130A1 CA 2848130 A1 CA2848130 A1 CA 2848130A1 CA 2848130 A CA2848130 A CA 2848130A CA 2848130 A CA2848130 A CA 2848130A CA 2848130 A1 CA2848130 A1 CA 2848130A1
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- Canada
- Prior art keywords
- containment shell
- shell according
- cone
- vortex breaking
- bottom inside
- Prior art date
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- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D27/14—Details
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- 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
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- 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
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
- F04D13/0626—Details of the can
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/25—Devices for sensing temperature, or actuated thereby
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
- H02K49/108—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with an axial air gap
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
- H02K5/1282—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs the partition wall in the air-gap being non cylindrical
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Surgical Instruments (AREA)
- Pipe Accessories (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Crushing And Grinding (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to a split case for a magnetic coupling, comprising a substantially cylindrical peripheral area (3) and a base (2), wherein the base (2) has, on an inner face (20) of the base directed toward the interior of the split case, a solid cone (4), which is coaxial with respect to a mid-axis (X-X) of the split case, and at least one vortex breaking device (5; 6), which is arranged on the inner face (20) of the base and which projects from the inner side (20) of the base.
Description
EagleBurgmann Germany GmbH & Co. KG BM1120701PCT-6/GR
Auflere Sauerlacher Str. 6-10 PV242 82515 Wolfratshausen July 2, 2012 Containment shell for a magnetic coupling with improved fluid flow Description The present invention refers to a containment shell for a magnetic coupling with improved fluid flow.
Containment shells are known from the prior art in various configurations and e.g.
used in magnetic couplings for sealing pumps or stirrers. A drive torque is here transmitted by magnetic field forces through the containment shell. During operation, increased wear may now occur particularly on an inside of a bottom of the containment shell, especially when the containment shell is exposed to contact with an abrasive medium, e.g. a fluid mixed with solids. Washouts of the containment shell or even a complete removal of containment shell material may occur, which leads to undesired leaks of the magnetic coupling. Moreover, wear may also occur due to cavitation. Furthermore, EP 1 719 914 A2 discloses a containment shell which comprises an arched sheet-metal bottom with a central impression provided on the bottom. Such an impression is used for the mechanical stabilization of the thin sheet-metal bottom of the containment shell.
It is the object of the present invention to provide a containment shell for a magnetic coupling which, while being of a simple structure and producible in a simple way at low costs, prevents undesired damage to the containment shell caused by washouts.
This object is achieved by a containment shell comprising the features of claim 1; the sub-claims show preferred developments of the invention.
The containment shell according to the invention with the features of claim 1 has the advantage that it is possible to avoid undesired wear on the bottom of the containment shell caused by cavitation and/or abrasive media. The service life of the containment shell can thereby be extended. This is achieved according to the invention in that a solid cone which is oriented to be coaxial to a center axis of the containment shell is arranged on the bottom of the containment shell on a bottom inside directed inwards toward the containment shell. During operation, the solid cone influences a flow of the medium in the containment shell interior such that especially standing vortices that are caused by the rotation of the inner magnet rotor can be avoided. Hence, owing to the arrangement of the solid cone on the bottom of the containment shell, the flow is influenced in a targeted manner in the interior of the containment shell during operation, so that damage on the containment shell bottom can be avoided.
Furthermore, the containment shell comprises a vortex breaking device which is arranged on the bottom inside and protrudes from the bottom inside. Owing to the vortex breaking device according to the invention on the bottom of the containment shell, the flow of the fluid in the interior of the containment shell is influenced during operation such that vortices are not at all formed in the interior of the containment shell or are forced to separate from the bottom by the vortex breaking device and are thus disintegrated. To be more specific, a hydraulically smooth bottom is to be created on the bottom inside and is to prevent a turbulent flow directly on the bottom inside.
Auflere Sauerlacher Str. 6-10 PV242 82515 Wolfratshausen July 2, 2012 Containment shell for a magnetic coupling with improved fluid flow Description The present invention refers to a containment shell for a magnetic coupling with improved fluid flow.
Containment shells are known from the prior art in various configurations and e.g.
used in magnetic couplings for sealing pumps or stirrers. A drive torque is here transmitted by magnetic field forces through the containment shell. During operation, increased wear may now occur particularly on an inside of a bottom of the containment shell, especially when the containment shell is exposed to contact with an abrasive medium, e.g. a fluid mixed with solids. Washouts of the containment shell or even a complete removal of containment shell material may occur, which leads to undesired leaks of the magnetic coupling. Moreover, wear may also occur due to cavitation. Furthermore, EP 1 719 914 A2 discloses a containment shell which comprises an arched sheet-metal bottom with a central impression provided on the bottom. Such an impression is used for the mechanical stabilization of the thin sheet-metal bottom of the containment shell.
It is the object of the present invention to provide a containment shell for a magnetic coupling which, while being of a simple structure and producible in a simple way at low costs, prevents undesired damage to the containment shell caused by washouts.
This object is achieved by a containment shell comprising the features of claim 1; the sub-claims show preferred developments of the invention.
The containment shell according to the invention with the features of claim 1 has the advantage that it is possible to avoid undesired wear on the bottom of the containment shell caused by cavitation and/or abrasive media. The service life of the containment shell can thereby be extended. This is achieved according to the invention in that a solid cone which is oriented to be coaxial to a center axis of the containment shell is arranged on the bottom of the containment shell on a bottom inside directed inwards toward the containment shell. During operation, the solid cone influences a flow of the medium in the containment shell interior such that especially standing vortices that are caused by the rotation of the inner magnet rotor can be avoided. Hence, owing to the arrangement of the solid cone on the bottom of the containment shell, the flow is influenced in a targeted manner in the interior of the containment shell during operation, so that damage on the containment shell bottom can be avoided.
Furthermore, the containment shell comprises a vortex breaking device which is arranged on the bottom inside and protrudes from the bottom inside. Owing to the vortex breaking device according to the invention on the bottom of the containment shell, the flow of the fluid in the interior of the containment shell is influenced during operation such that vortices are not at all formed in the interior of the containment shell or are forced to separate from the bottom by the vortex breaking device and are thus disintegrated. To be more specific, a hydraulically smooth bottom is to be created on the bottom inside and is to prevent a turbulent flow directly on the bottom inside.
Further preferably, the vortex breaking device is a longitudinal element. The longitudinal element is preferably a rectangular block or a trapezoidal block or a semi-ellipsoid. Further preferably, the ends of the longitudinal element are made round or flat. To be able to produce the vortex breaking device as simply as possible and at low costs, this device is preferably configured as a rectangular block.
Preferably, the vortex breaking device has a longitudinal axis which is oriented in radial direction of the containment shell. Alternatively, a longitudinal axis of the longitudinal element extends at an angle of inclination relative to the radial direction.
This particularly promotes the formation of a laminar flow on the bottom inside.
Preferably, the containment shell comprises exactly two vortex breaking devices that are arranged opposite to each other on the bottom of the containment shell by .
Further preferably, the vortex breaking device is a cylinder element or a cone element or a polyhedron. Particularly preferably, plural cylinder elements and/or cone elements and/or polyhedrons are provided on the bottom inside to influence the flow.
Further preferably, the vortex breaking device comprises at least one surface inclined at an angle relative to the bottom inside. The angle is preferably in a range between 15 and 75 and is particularly preferably 45 .
To minimize flow losses, the solid cone preferably comprises a rounded tip.
Particularly preferably, the rounded tip is formed with a constant radius.
Alternatively, the rounded tip is formed such that a preferably circular flattening is formed on an outermost end. An axial length of the solid cone can thereby be reduced and a flow-promoting shape of the cone can nevertheless be maintained.
Further preferably, the containment shell is provided on an outer bottom side with a recess for accommodating a temperature measuring device. The recess is preferably arranged to be coaxial to the center axis of the solid cone and is provided in the solid cone preferably at least in part, particularly preferably completely. It is thereby possible to additionally integrate a temperature measuring device in the containment shell bottom without the need for increasing the thickness of a containment shell bottom. The temperature measuring device can thus be accommodated easily in part or completely in the solid cone, resulting in a very compact configuration of the containment shell with integrated temperature measuring device.
Further preferably, a transition from the solid cone to a bottom inside of the containment shell is formed with a second radius. Furthermore, a transition from the bottom inside to the cylindrical casing area of the containment shell is preferably formed with a third radius. Particularly preferably, the first radius of the rounded tip of the solid cone, the second radius, and the third radius are chosen to be identical.
Further preferably, a ratio of a length of the cone in axial direction of the containment shell, starting from the bottom inside, to a thickness of the bottom is between 3 and 4 and is particularly between 3.4 and 3.8 and is particularly about 3.6. When this ratio is observed, almost no wear will occur during operation.
Further preferably, a ratio of an inner diameter of the containment shell to a base diameter of the cone is between 5 and 7, particularly between 5.5 and 5.6 and is particularly about 6. Further preferably, an angle of the solid cone, starting from the bottom of the containment shell, is about 60 . The observation of these dimensions of the solid cone and the containment shell, respectively, also ensure excellent results as regards the service life of the containment shell, particularly also when abrasive media are used.
The present invention further refers to a magnetic coupling comprising an inner rotor, an outer rotor and a containment shell according to the invention. The magnetic coupling is preferably used in stirrers or pumps.
Embodiments of the invention shall now be described in detail with reference to the accompanying drawing. In the drawing, Fig. 1 is a schematic sectional view of a containment shell according to a first embodiment of the invention;
Fig. 2 is a schematic sectional view of a containment shell according to a second 5 embodiment of the invention;
Fig. 3 is a view into the containment shell of Fig. 2;
Fig. 4 is a view of a back side of the containment shell of Fig. 2;
Fig. 5 is a perspective view of the containment shell of Fig. 2;
Fig. 6 is a schematic sectional view of a containment shell according to a third embodiment of the invention;
Fig. 7 is a schematic sectional view of a containment shell according to a fourth embodiment of the invention; and Figs. 8 to 12 are preferred examples of vortex breaking devices.
A containment shell 1 according to a first embodiment of the invention is described in detail hereinafter.
As can be seen in Fig. 1, the containment shell 1 comprises a bottom 2 and a cylindrical casing 3 which is connected to the bottom.
The bottom 2 comprises a solid cone 4 which is arranged on an inside of the bottom.
The solid cone 4 is configured in the form of a straight cone and is arranged to be coaxial to a center axis X-X of the containment shell. The cone 4 comprises a tip rounded with a radius R1, a circular flattening 50 with a diameter D3 being provided on the tip. The cone 4 is formed at an angle a of about 60 with respect to the bottom inside 20. The bottom further comprises a vortex breaking device 5 formed as a longitudinal element in the form of a small block with a longitudinal axis Y.
The vortex breaking device 5 extends here in radial direction of the containment shell and is spaced at a distance from the cone 4 and also from the casing 3. The vortex breaking device 5 particularly serves to interrupt vortices possibly created during operation in the interior of the containment shell 1, which vortices may cause increased wear on the bottom inside 20. The cone 4 has a maximum diameter D1 on its base area.
The cylindrical casing 3 has an inner diameter D2. A ratio of the inner diameter D2 to the base diameter D1 is here in a range between 5 and 7. By fulfillment of the inequality 5 < D2/D1 < 7 it is possible to achieve a particularly positive influence on the flow in terms of reduced wear. The first embodiment shows the ratio D2/D1 = 6.
In addition to the first radius R1 of the tip of the cone 4 and a second radius R2 in a transition area between the cone 4 and the bottom inside 20, there is a third radius R3 at the transition from the bottom inside 20 to the casing 3 of the containment shell.
The radii R1, R2, R3 are here equal.
Furthermore, a ratio of a length L of the cone 4 in the direction of the center axis X-X
of the containment shell, starting from the bottom inside 20, to a thickness 6 of the bottom 2 is between 3 and 4 and is 3.6 (LIB = 3.6) in this embodiment.
As can further be seen in Fig. 1, a bottom outside 21 has provided thereon a recess 7 which is provided to be coaxial to the center axis X-X of the containment shell. The recess 7 extends in part into the solid cone 4. Furthermore, a protruding circular area 9 is formed on the bottom outside 21. The circular area 9 serves to center the containment shell. The recess 7 serves to accommodate a temperature measuring device 8, which is schematically outlined in Fig. 1. A temperature measuring device can thereby be integrated into the containment shell without any problems, whereby particularly an axial length of the containment shell can be kept small owing to the partial provision of the recess in the solid cone 4.
Hence, the flow within the containment shell interior can thereby be influenced according to the invention in a targeted manner by the provision of the solid cone 4. In addition, owing to the provision of the vortex breaking device 5, the occurrence of standing vortices, which exhibit a very high abrasive force, can also be prevented.
Hence, the formation of washouts or other types of wear can be prevented according to the invention. Here, the provision of radii at the transition between the solid cone 4 and the bottom and at the transition from the bottom to the casing, respectively, additionally supports a deflection of the flowing medium that is as smooth as possible and without any losses, if possible, so as to minimize wear phenomena.
Furthermore, flow separations are prevented by the targeted flow guidance according to the invention at the bottom, which flow separations may generate negative pressure areas in the prior art where cavitation and/or vortex formations may occur.
Furthermore, it should be noted that the bottom is preferably produced as a single part in a machining method and is then fastened to the casing 3, e.g. by welding or another joining method.
Further embodiments of the invention shall be described in detail hereinafter, wherein identical or functionally identical parts are designated by the same reference numerals as in the first embodiment.
Figs. 2-5 show a containment shell 1 according to a second embodiment of the invention in detail. The second embodiment substantially corresponds to the first embodiment, but in contrast to the first embodiment two vortex breaking devices 5, 6 are provided in the second embodiment. The two vortex breaking devices 5, 6, in turn, extend each in radial direction of the containment shell bottom, wherein the two vortex breaking devices 5, 6 are positioned on a common straight line through the center axis X-X of the containment shell. Hence, the bottom 2 has a symmetrical structure.
Fig. 6 shows a third embodiment of the invention, in which no additional vortex breaking devices are provided. Furthermore, the rounded tip of the solid cone 4 is formed without any flattening continuously with a first radius R1. Hence, the tip of the cone 4 of the third embodiment has a partial ball shape.
Preferably, the vortex breaking device has a longitudinal axis which is oriented in radial direction of the containment shell. Alternatively, a longitudinal axis of the longitudinal element extends at an angle of inclination relative to the radial direction.
This particularly promotes the formation of a laminar flow on the bottom inside.
Preferably, the containment shell comprises exactly two vortex breaking devices that are arranged opposite to each other on the bottom of the containment shell by .
Further preferably, the vortex breaking device is a cylinder element or a cone element or a polyhedron. Particularly preferably, plural cylinder elements and/or cone elements and/or polyhedrons are provided on the bottom inside to influence the flow.
Further preferably, the vortex breaking device comprises at least one surface inclined at an angle relative to the bottom inside. The angle is preferably in a range between 15 and 75 and is particularly preferably 45 .
To minimize flow losses, the solid cone preferably comprises a rounded tip.
Particularly preferably, the rounded tip is formed with a constant radius.
Alternatively, the rounded tip is formed such that a preferably circular flattening is formed on an outermost end. An axial length of the solid cone can thereby be reduced and a flow-promoting shape of the cone can nevertheless be maintained.
Further preferably, the containment shell is provided on an outer bottom side with a recess for accommodating a temperature measuring device. The recess is preferably arranged to be coaxial to the center axis of the solid cone and is provided in the solid cone preferably at least in part, particularly preferably completely. It is thereby possible to additionally integrate a temperature measuring device in the containment shell bottom without the need for increasing the thickness of a containment shell bottom. The temperature measuring device can thus be accommodated easily in part or completely in the solid cone, resulting in a very compact configuration of the containment shell with integrated temperature measuring device.
Further preferably, a transition from the solid cone to a bottom inside of the containment shell is formed with a second radius. Furthermore, a transition from the bottom inside to the cylindrical casing area of the containment shell is preferably formed with a third radius. Particularly preferably, the first radius of the rounded tip of the solid cone, the second radius, and the third radius are chosen to be identical.
Further preferably, a ratio of a length of the cone in axial direction of the containment shell, starting from the bottom inside, to a thickness of the bottom is between 3 and 4 and is particularly between 3.4 and 3.8 and is particularly about 3.6. When this ratio is observed, almost no wear will occur during operation.
Further preferably, a ratio of an inner diameter of the containment shell to a base diameter of the cone is between 5 and 7, particularly between 5.5 and 5.6 and is particularly about 6. Further preferably, an angle of the solid cone, starting from the bottom of the containment shell, is about 60 . The observation of these dimensions of the solid cone and the containment shell, respectively, also ensure excellent results as regards the service life of the containment shell, particularly also when abrasive media are used.
The present invention further refers to a magnetic coupling comprising an inner rotor, an outer rotor and a containment shell according to the invention. The magnetic coupling is preferably used in stirrers or pumps.
Embodiments of the invention shall now be described in detail with reference to the accompanying drawing. In the drawing, Fig. 1 is a schematic sectional view of a containment shell according to a first embodiment of the invention;
Fig. 2 is a schematic sectional view of a containment shell according to a second 5 embodiment of the invention;
Fig. 3 is a view into the containment shell of Fig. 2;
Fig. 4 is a view of a back side of the containment shell of Fig. 2;
Fig. 5 is a perspective view of the containment shell of Fig. 2;
Fig. 6 is a schematic sectional view of a containment shell according to a third embodiment of the invention;
Fig. 7 is a schematic sectional view of a containment shell according to a fourth embodiment of the invention; and Figs. 8 to 12 are preferred examples of vortex breaking devices.
A containment shell 1 according to a first embodiment of the invention is described in detail hereinafter.
As can be seen in Fig. 1, the containment shell 1 comprises a bottom 2 and a cylindrical casing 3 which is connected to the bottom.
The bottom 2 comprises a solid cone 4 which is arranged on an inside of the bottom.
The solid cone 4 is configured in the form of a straight cone and is arranged to be coaxial to a center axis X-X of the containment shell. The cone 4 comprises a tip rounded with a radius R1, a circular flattening 50 with a diameter D3 being provided on the tip. The cone 4 is formed at an angle a of about 60 with respect to the bottom inside 20. The bottom further comprises a vortex breaking device 5 formed as a longitudinal element in the form of a small block with a longitudinal axis Y.
The vortex breaking device 5 extends here in radial direction of the containment shell and is spaced at a distance from the cone 4 and also from the casing 3. The vortex breaking device 5 particularly serves to interrupt vortices possibly created during operation in the interior of the containment shell 1, which vortices may cause increased wear on the bottom inside 20. The cone 4 has a maximum diameter D1 on its base area.
The cylindrical casing 3 has an inner diameter D2. A ratio of the inner diameter D2 to the base diameter D1 is here in a range between 5 and 7. By fulfillment of the inequality 5 < D2/D1 < 7 it is possible to achieve a particularly positive influence on the flow in terms of reduced wear. The first embodiment shows the ratio D2/D1 = 6.
In addition to the first radius R1 of the tip of the cone 4 and a second radius R2 in a transition area between the cone 4 and the bottom inside 20, there is a third radius R3 at the transition from the bottom inside 20 to the casing 3 of the containment shell.
The radii R1, R2, R3 are here equal.
Furthermore, a ratio of a length L of the cone 4 in the direction of the center axis X-X
of the containment shell, starting from the bottom inside 20, to a thickness 6 of the bottom 2 is between 3 and 4 and is 3.6 (LIB = 3.6) in this embodiment.
As can further be seen in Fig. 1, a bottom outside 21 has provided thereon a recess 7 which is provided to be coaxial to the center axis X-X of the containment shell. The recess 7 extends in part into the solid cone 4. Furthermore, a protruding circular area 9 is formed on the bottom outside 21. The circular area 9 serves to center the containment shell. The recess 7 serves to accommodate a temperature measuring device 8, which is schematically outlined in Fig. 1. A temperature measuring device can thereby be integrated into the containment shell without any problems, whereby particularly an axial length of the containment shell can be kept small owing to the partial provision of the recess in the solid cone 4.
Hence, the flow within the containment shell interior can thereby be influenced according to the invention in a targeted manner by the provision of the solid cone 4. In addition, owing to the provision of the vortex breaking device 5, the occurrence of standing vortices, which exhibit a very high abrasive force, can also be prevented.
Hence, the formation of washouts or other types of wear can be prevented according to the invention. Here, the provision of radii at the transition between the solid cone 4 and the bottom and at the transition from the bottom to the casing, respectively, additionally supports a deflection of the flowing medium that is as smooth as possible and without any losses, if possible, so as to minimize wear phenomena.
Furthermore, flow separations are prevented by the targeted flow guidance according to the invention at the bottom, which flow separations may generate negative pressure areas in the prior art where cavitation and/or vortex formations may occur.
Furthermore, it should be noted that the bottom is preferably produced as a single part in a machining method and is then fastened to the casing 3, e.g. by welding or another joining method.
Further embodiments of the invention shall be described in detail hereinafter, wherein identical or functionally identical parts are designated by the same reference numerals as in the first embodiment.
Figs. 2-5 show a containment shell 1 according to a second embodiment of the invention in detail. The second embodiment substantially corresponds to the first embodiment, but in contrast to the first embodiment two vortex breaking devices 5, 6 are provided in the second embodiment. The two vortex breaking devices 5, 6, in turn, extend each in radial direction of the containment shell bottom, wherein the two vortex breaking devices 5, 6 are positioned on a common straight line through the center axis X-X of the containment shell. Hence, the bottom 2 has a symmetrical structure.
Fig. 6 shows a third embodiment of the invention, in which no additional vortex breaking devices are provided. Furthermore, the rounded tip of the solid cone 4 is formed without any flattening continuously with a first radius R1. Hence, the tip of the cone 4 of the third embodiment has a partial ball shape.
Fig. 7 shows a fourth embodiment of the invention; in this embodiment no recess 7 is provided for accommodating a temperature measuring device. Furthermore, the containment shell of the fourth embodiment is also without any vortex breaking devices. Hence, in this embodiment, the solid cone 4 and the rounded flow transition areas determine the flow configuration alone.
It should be noted with respect to all of the embodiments described that, instead of a deep-drawn containment shell, it is thus possible according to the invention to use a containment shell with a bottom 2 consisting of a solid material, said containment shell showing considerable advantages over the normally used deep-drawn containment shells particularly with respect to service life and the occurrence of wear.
To be more specific, a trouble-free use is thereby made possible also in combination with abrasive media and high rotational speeds of the magnetic coupling rotors.
Figs. 8 to 12 show alternative preferred embodiments of vortex breaking devices according to the invention. Fig. 8 shows the vortex breaking device 51 as a longitudinal element with a trapezoidal cross-section. The corners of the trapezoid may also be provided in a rounded flow-promoting shape. The flanks of the trapezoidal vortex breaking device 51 are here inclined at an angle f3 of 45 .
In the variant shown in Fig. 9, a plurality of block-shaped vortex breaking devices 5 are provided evenly distributed to protrude from the bottom inside 20. Preferred is an uneven total number of the vortex breaking devices 5. The embodiment shown in Fig.
10 shows a vortex breaking device 51 in the form of a semi-ellipsoid. The embodiment shown in Fig. 11 shows vortex breaking devices 53 which extend at an angle y relative to a radial line R. The vortex breaking devices 53, which are also longitudinal elements with a longitudinal axis, are thereby slightly rotated in flow direction according to angle y. In the preferred embodiment shown in Fig. 12, the vortex breaking devices 54 are provided in the form of cylinders. Any desired arrangement may here be chosen, with a plurality of vortex breaking devices 54 being preferably arranged along a common circular path around the center axis X-X. Instead of the cylinder shape, the vortex breaking devices 54 may also have a polygonal shape (regular or irregular polyhedron) or a conical shape.
It should be noted with respect to all of the embodiments described that, instead of a deep-drawn containment shell, it is thus possible according to the invention to use a containment shell with a bottom 2 consisting of a solid material, said containment shell showing considerable advantages over the normally used deep-drawn containment shells particularly with respect to service life and the occurrence of wear.
To be more specific, a trouble-free use is thereby made possible also in combination with abrasive media and high rotational speeds of the magnetic coupling rotors.
Figs. 8 to 12 show alternative preferred embodiments of vortex breaking devices according to the invention. Fig. 8 shows the vortex breaking device 51 as a longitudinal element with a trapezoidal cross-section. The corners of the trapezoid may also be provided in a rounded flow-promoting shape. The flanks of the trapezoidal vortex breaking device 51 are here inclined at an angle f3 of 45 .
In the variant shown in Fig. 9, a plurality of block-shaped vortex breaking devices 5 are provided evenly distributed to protrude from the bottom inside 20. Preferred is an uneven total number of the vortex breaking devices 5. The embodiment shown in Fig.
10 shows a vortex breaking device 51 in the form of a semi-ellipsoid. The embodiment shown in Fig. 11 shows vortex breaking devices 53 which extend at an angle y relative to a radial line R. The vortex breaking devices 53, which are also longitudinal elements with a longitudinal axis, are thereby slightly rotated in flow direction according to angle y. In the preferred embodiment shown in Fig. 12, the vortex breaking devices 54 are provided in the form of cylinders. Any desired arrangement may here be chosen, with a plurality of vortex breaking devices 54 being preferably arranged along a common circular path around the center axis X-X. Instead of the cylinder shape, the vortex breaking devices 54 may also have a polygonal shape (regular or irregular polyhedron) or a conical shape.
List of reference numerals 1 containment shell 2 bottom 3 casing 4 solid cone 5, 6 vortex breaking devices 7 recess 8 temperature measuring device 9 protruding circular area bottom inside 21 bottom outside 40 circular flattening 51 trapezoidal vortex breaking device 15 52 semi-ellipsoidal vortex breaking device 53 inclined vortex breaking device 54 cylindrical vortex breaking device = thickness 20 L length D1 base diameter of the cone D2 inner diameter of the containment shell D3 diameter of the flattening = radial line R1, R2, R3 first, second, third radius X-X center axis = longitudinal axis of the vortex breaking device a angle angle y angle
Claims (15)
1. A containment shell for a magnetic coupling, comprising:
- a substantially cylindrical casing area (3) and a bottom (2), - wherein the bottom (20) is provided on a bottom inside (20) directed toward the containment shell interior with a solid cone (4) which is coaxial to a center axis (X-X) of the containment shell, and - at least one vortex breaking device (5; 6) which is arranged on the bottom inside (20) and which protrudes from the bottom inside (20).
- a substantially cylindrical casing area (3) and a bottom (2), - wherein the bottom (20) is provided on a bottom inside (20) directed toward the containment shell interior with a solid cone (4) which is coaxial to a center axis (X-X) of the containment shell, and - at least one vortex breaking device (5; 6) which is arranged on the bottom inside (20) and which protrudes from the bottom inside (20).
2. The containment shell according to claim 1, characterized in that the vortex breaking device (5; 6) is a longitudinal element, particularly a rectangular block or a trapezoidal block or a semi-ellipsoid.
3. The containment shell according to claim 2, characterized in that the vortex breaking device (5; 6) has a longitudinal axis (Y) which extends on the bottom inside (20) in radial direction relative to the center axis (X-X) or which extends at an angle of inclination (.gamma.) relative to the radial direction.
4. The containment shell according to claim 2 or 3, characterized by exactly two longitudinal elements as vortex breaking devices (5; 6) which are opposite to each other on the bottom of the containment shell by 180°.
5. The containment shell according to claim 1, characterized in that the vortex breaking device is a cylinder element or a cone element or a polyhedron.
6. The containment shell according to claim 1, characterized in that the vortex breaking device comprises at least one surface inclined at an angle, particularly between 15° and 75°.
7. The containment shell according to any one of the preceding claims, characterized in that the cone (4) has a rounded tip.
8. The containment shell according to claim 7, characterized in that the rounded tip has a constant first radius (R1) or that the rounded tip is formed with a first radius (R1) and has a flattening (40) on the outermost end of the tip.
9. The containment shell according to any one of the preceding claims, further comprising a recess (7) on a bottom outside (21), wherein the recess (7) is configured to accommodate a temperature measuring device (8).
10. The containment shell according to claim 9, characterized in that the recess (7) extends in coaxial direction relative to the center axis (X-X) and is provided particularly in part in the solid cone (4).
11. The containment shell according to any one of the preceding claims, characterized in that a transition area from the solid cone (4) to the bottom inside (20) is formed with a second radius (R2) and/or that a transition area from the bottom inside (20) to the cylindrical casing area (3) is formed with a third radius (R3).
12. The containment shell according to any one of the preceding claims, characterized in that a ratio of a length (L) of the cone (4) in the direction of the center axis (X-X), starting from the bottom inside (20), to a thickness (B) of the bottom (2) is between 3 and 4, particularly between 3.4 and 3.8 and is further particularly about 3.6.
13. The containment shell according to any one of the preceding claims, characterized in that a ratio of an inner diameter (D2) of the containment shell to a base diameter (D1) of the cone (4) is between 5 and 7, particularly between 5.5 and 5.6, and further particularly about 6.
14. A magnetic coupling comprising a containment shell according to any one of the preceding claims.
15. The magnetic coupling according to claim 14, further comprising a temperature measuring device (8) which is arranged at least in part in a recess (7) provided in the solid cone (4).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011114191.3 | 2011-09-22 | ||
| DE102011114191A DE102011114191A1 (en) | 2011-09-22 | 2011-09-22 | Slit pot for a magnetic coupling with improved fluid flow |
| PCT/EP2012/002776 WO2013041161A2 (en) | 2011-09-22 | 2012-07-02 | Split case for a magnetic coupling having improved fluid flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2848130A1 true CA2848130A1 (en) | 2013-03-28 |
Family
ID=46513690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2848130A Abandoned CA2848130A1 (en) | 2011-09-22 | 2012-07-02 | Containment shell for a magnetic coupling with improved fluid flow |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2759042B1 (en) |
| BR (1) | BR112014006530A2 (en) |
| CA (1) | CA2848130A1 (en) |
| DE (1) | DE102011114191A1 (en) |
| WO (1) | WO2013041161A2 (en) |
| ZA (1) | ZA201401688B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104235027A (en) * | 2013-06-05 | 2014-12-24 | 日本电产株式会社 | Motor and pump |
| WO2023030600A1 (en) * | 2021-08-30 | 2023-03-09 | Pierburg Pump Technology Gmbh | Electrical automotive liquid pump |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014006568A1 (en) * | 2013-05-08 | 2014-11-13 | Ksb Aktiengesellschaft | Pump arrangement and method for producing a split pot of the pump assembly |
| DE102015223339A1 (en) * | 2015-11-25 | 2017-06-01 | Mahle International Gmbh | Magnetic coupling, in particular for a waste heat utilization device |
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| DE2515634A1 (en) * | 1975-04-10 | 1976-10-21 | Janke & Kunkel Kg | Rotating magnetic stirrer - having a stirring element of triangular cross section |
| US4498785A (en) * | 1982-06-09 | 1985-02-12 | Techne Corporation | Floating magnetic stirrer for culture medium |
| US5240327A (en) * | 1987-10-21 | 1993-08-31 | Outokumpu Oy | Method for creating double loop flow |
| FI86601C (en) * | 1987-10-21 | 1992-09-25 | Outokumpu Oy | SAETT ATT AOSTADKOMMA DUBBELCIRKULATIONSFLOEDE OCH APPARATUR DAERTILL. |
| DE9100515U1 (en) * | 1991-01-17 | 1991-04-04 | Friatec-Rheinhütte GmbH & Co, 65203 Wiesbaden | Magnetically coupled centrifugal pump |
| US5195867A (en) * | 1992-03-05 | 1993-03-23 | Barrett, Haentjens & Co. | Slurry pump shaft seal flushing |
| DE4238132C2 (en) * | 1992-11-12 | 2002-10-24 | Teves Gmbh Alfred | Centrifugal pump, in particular water pump for motor vehicles |
| DE9316897U1 (en) * | 1993-11-04 | 1994-07-28 | Renner GmbH, 75433 Maulbronn | Magnetic pump with overheating protection |
| JP3363744B2 (en) * | 1997-06-25 | 2003-01-08 | 株式会社イワキ | Canned pump |
| US5782556A (en) * | 1997-09-04 | 1998-07-21 | Chu; Chai-Kan | Apparatus for quickly making multiple-phase microemulsion fuel oil |
| DE10024953A1 (en) | 2000-05-22 | 2001-11-29 | Richter Chemie Tech Itt Gmbh | Centrifugal pump with magnetic coupling |
| DE10130333B4 (en) * | 2001-06-26 | 2004-05-27 | Heraeus Kulzer Gmbh & Co. Kg | Galvanic device for the deposition of precious metal |
| JP2003184787A (en) * | 2001-12-18 | 2003-07-03 | Ebara Corp | Centrifugal motor pump |
| DE10201942A1 (en) * | 2002-01-19 | 2003-07-31 | Wilo Gmbh | Centrifugal pump driven by electric motor, has central temperature sensor removably inserted into bore in rear wall of motor housing enclosing stator chamber |
| JP4739857B2 (en) * | 2005-08-12 | 2011-08-03 | 東芝産業機器製造株式会社 | Resin can for canned motor and manufacturing method thereof, injection mold, canned motor, canned motor pump |
-
2011
- 2011-09-22 DE DE102011114191A patent/DE102011114191A1/en not_active Withdrawn
-
2012
- 2012-07-02 BR BR112014006530A patent/BR112014006530A2/en not_active IP Right Cessation
- 2012-07-02 EP EP12735206.0A patent/EP2759042B1/en not_active Not-in-force
- 2012-07-02 WO PCT/EP2012/002776 patent/WO2013041161A2/en unknown
- 2012-07-02 CA CA2848130A patent/CA2848130A1/en not_active Abandoned
-
2014
- 2014-03-07 ZA ZA2014/01688A patent/ZA201401688B/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104235027A (en) * | 2013-06-05 | 2014-12-24 | 日本电产株式会社 | Motor and pump |
| WO2023030600A1 (en) * | 2021-08-30 | 2023-03-09 | Pierburg Pump Technology Gmbh | Electrical automotive liquid pump |
Also Published As
| Publication number | Publication date |
|---|---|
| BR112014006530A2 (en) | 2017-03-28 |
| EP2759042A2 (en) | 2014-07-30 |
| EP2759042B1 (en) | 2018-09-12 |
| WO2013041161A3 (en) | 2014-06-19 |
| WO2013041161A2 (en) | 2013-03-28 |
| ZA201401688B (en) | 2014-11-26 |
| DE102011114191A1 (en) | 2013-03-28 |
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| EEER | Examination request |
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