WO2015091722A1 - Sealing arrangement - Google Patents
Sealing arrangement Download PDFInfo
- Publication number
- WO2015091722A1 WO2015091722A1 PCT/EP2014/078356 EP2014078356W WO2015091722A1 WO 2015091722 A1 WO2015091722 A1 WO 2015091722A1 EP 2014078356 W EP2014078356 W EP 2014078356W WO 2015091722 A1 WO2015091722 A1 WO 2015091722A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- carrier element
- sealing arrangement
- magnet
- arrangement according
- machine
- Prior art date
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Classifications
-
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/762—Sealings of ball or roller bearings by means of a fluid
- F16C33/763—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap
- F16C33/765—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap by a magnetic field
Definitions
- the invention relates to a sealing arrangement for sealing a first space against a second space of a machine arrangement, comprising a first carrier element which is fixed at or in a first machine part of the machine arrangement and a second carrier element which is fixed at or in a second machine part of the machine arrangement, wherein the second machine part can rotate relatively to the first machine part.
- sealing arrangements which work with one or more sliding sealing lips to seal a first space against a second space.
- sealing arrangements are known which have no sliding sealing lips but establish a sealing effect with small gaps, i.e. those sealing arrangements are free of sliding contact.
- the sealing effect depends significantly on the magnitude of the gap which remains between the respective sealing parts.
- the manufacturing of the required parts is sometimes costly because a high degree of precision must be obtained to establish a sufficiently small gap.
- the tolerances and the mounting method are critical parts as the gap is the most sensitive variable for the sealing capability, e.g. to resist a pressure difference between the two spaces which are sealed against another.
- a s o l u t i o n according to the invention is characterized in that at least one magnet is arranged at the first carrier element, wherein a magneto-rheological fluid is arranged at at least a part of the surface of the magnet and/or at at least a part of the surface of a part of the sealing arrangement in which a magnetic field is induced by the magnet, wherein at least a part of the second carrier element is arranged in the proximity of the magneto-rheological fluid, wherein a gap is established between the second carrier element and a surface of the magneto-rheological fluid and wherein a ferro fluid is arranged in the gap.
- the first machine part is preferably a housing of the machine arrangement; the second machine part is preferably a rotating shaft.
- the first carrier element is preferably arranged stationary and the second carrier element rotates relatively to the first carrier element during regular operation of the sealing arrangement.
- the magnet is preferably a permanent magnet.
- the carrier elements are at least partly made of iron.
- the part in which a magnetic field is induced by the magnet can consist at least partially of iron.
- the first carrier element can comprise a radially extending section at which the magnet is fixed.
- the part in which a magnetic field is induced by the magnet can be arranged at an axial end of the magnet.
- the second carrier element can have a radially extending section, wherein an axially extending section is arranged at the end of the radially extending section remote from the second machine part.
- the magneto-rheological fluid can then be arranged in a cup-shaped manner at the part in which a magnetic field is induced by the magnet.
- a gap can be established between the axially extending section of the second machine part and an axially extending section of the first carrier element.
- a ferro fluid can be arranged in the gap between the axially extending section of the second machine part and the axially extending section of the first carrier element.
- the gaps have preferably a hollow cylindrical shape.
- the sealing arrangement is preferably a part of a bearing arrangement.
- MRF magneto- rheological fluids
- FF ferro fluids
- the strength of the ferro fluid is based on the strength of the magnetic fields and the gap it is operating in.
- the magneto-rheological fluid acts as a semi- solid flux guiding component which is compatible with the ferro fluid.
- the ferro fluid is used as a seal element and as a lubricant between the magneto-rheological fluid and the adjacent carrier element (flinger).
- the gap itself is filled with the ferro fluid and can be extremely small.
- the combination of a magneto-rheological fluid and a ferro fluid allows to establish a very small gap between the rotating parts in an easy way.
- the magneto-rheological fluid will be attracted to the permanent magnet. This creates a layer on the magnet, which will remain in a quasi solid state due to its properties.
- the magneto-rheological fluid will settle itself and can be smoothened in its shape by the rotating carrier element (flinger).
- the gap between the magneto-rheological fluid and the carrier element (flinger) will be filled with the ferro fluid which should be compatible with the magneto- rheological fluid.
- the gap can be controlled in width (thickness) more accurately and can be smaller due to the fact that the carrier element (flinger) is able to "polish” the magneto-rheological fluid, keeping the gap extremely small without destroying the two components (magneto-rheological fluid and carrier element) when they would touch.
- the magnet holds the magneto-rheological fluid in position; the adjacent carrier element (flinger) defines the smoothness of the gap between the carrier element and magneto-rheological fluid during rotation.
- the ferro fluid which is also attracted by the magnet performs the sealing itself. Due to the fact that the gap (containing the ferro fluid) can be extremely small, the magnetic field will be high, and giving a better sealing effect.
- the ferro fluid can act as a lubricant between the magneto-rheological fluid and the carrier element (flinger).
- the gap can be established with a very small width in an easy way, resulting in a higher magnetic field and resulting in a better sealing performance.
- Magneto-rheological fluids are dispersions of micron-sized magnetic particles in a liquid carrier, which can reversibly and instantaneously change from a liquid state to a semi-solid or plastic state in the absence or presence of a magnetic field. Moreover, in their on-state (i. e. semi-solid state) these fluids show a viscoplastic behavior, which is characterized by a magnetic field- dependent yield stress. These main characteristics render magneto-rheological fluids useful for several controlled electro-mechanical applications.
- the properties of a magneto- rheological fluid are mainly determined by the composition and nature of its magnetic particles, its dispersion additives, and its carrier fluid.
- Ferro fluids are colloidal dispersions of magnetic nano-particles which carry a permanent magnetic moment. They have a diameter of around 10 nm, showing single magnetic domains. Several types of particles can be dispersed, such as magnetite and cobalt ferrite.
- a significant aspect in magnetic fluids is the particle stabilization in a certain solvent, otherwise the particles will aggregate and separate due to Van-der- Waals interactions.
- the additional presence of magnetic dipole-dipole interaction also plays a significant role in colloidal stability of ferro fluids, especially when they are subjected to external magnetic fields.
- steric stabilization Two distinct types of stabilization are known: steric stabilization and electrostatic stabilization. They can both be present in some cases. Steric stability is obtained by coating the particles with surfactants, which may lead to highly stable colloids (used typically for non-polar solvents). Electrostatic stabilization occurs if the particles become electrically charged (this is seen typically in polar solvents).
- Ferro fluids can be easily positioned or used in many mechanical devices by means of a magnetic field. A variety of phenomena have been observed for these systems in magnetic fields which are appropriate for different applications. These effects must be taken into account when utilizing magnetic fluids in different applications.
- the drawing shows an embodiment of the invention.
- the only figure shows a radial cross sectional view through a machine arrangement with two machine parts with a sealing arrangement which is arranged effectively between them.
- a machine arrangement 2 having a first machine part 4 which is a housing and having a second machine part 6 which is a rotating shaft.
- a sealing arrangement 1 is provided to seal a first space A against a second space B .
- the sealing arrangement 1 has two carrier elements, i.e. a first carrier element 3 which is connected with the housing 4 and a second carrier element 5 which is connected with the shaft 6.
- the first carrier element 3 has section which runs in axial direction a and which is in press fit connection with the housing 4. Furthermore, the first carrier element 3 has a radial section 3' which runs in radial direction r. At this radial section 3' a permanent magnet 7 is fixed, e.g. by means of an adhesive.
- the magnet 7 is generally of ring-shape with the radial cross section as depicted.
- the second carrier element 5 has also a section which runs in axial direction a; this section is connected with the shaft 6 by press fit. Then, the second carrier element 5 has a radial section 5' which runs in radial direction r. At the end of the radial section 5' a further section is arranged, i. e. an axial section 5" which runs in axial direction a. Thus the second carrier element 5 forms a cup-shaped structure in the radial cross section.
- the part 10 is generally of ring-shape and is made of iron (Fe430) in the depicted example.
- a magneto-rheological fluid 8 is arranged around the surface of the part 10 which forms a respective cup-shaped structure in the cross sectional view and which fits basically into the structure which is formed by the second carrier element 5 with its sections 5' and 5". So, ring-shaped gaps 11 and 12 are given between the second carrier element 5 and the magneto- rheological fluid 8.
- a magneto-rheological fluid 9 which is arranged at the radial inner end of the radial section 3' of the first carrier element 3. Also here, a gap 13 is formed between the magneto-rheological fluid 9 and the radial outer surface of the second carrier element 5.
- a gap 15 is formed between the axial section 5" of the second carrier element 5 and the first carrier element 3.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention relates to a sealing arrangement (1) for sealing a first space (A) against a second space (B) of a machine arrangement (2), comprising a first carrier element (3) which is fixed at or in a first machine part (4) of the machine arrangement (2) and a second carrier element (5) which is fixed at or in a second machine part (6) of the machine arrangement (2), wherein the second machine part (6) can rotate relatively to the first machine part (3). To obtain a good sealing performance the invention is characterized in that at least one magnet (7) is arranged at the first carrier element (3), wherein a magneto-rheological fluid (8, 9) is arranged at at least a part of the surface of the mag- net (7) and/or at at least a part of the surface of a part (10) of the sealing arrangement (1) in which a magnetic field is induced by the magnet (7), where- in at least a part of the second carrier element (5) is arranged in the proximity of the magneto-rheological fluid (8, 9), wherein a gap (11, 12, 13) is established between the second carrier element (5) and a surface of the magneto-rheological fluid (8, 9) and wherein a ferro fluid (14) is arranged in the gap (11, 12, 13).
Description
SEALING ARRANGEMENT
Technical Field
The invention relates to a sealing arrangement for sealing a first space against a second space of a machine arrangement, comprising a first carrier element which is fixed at or in a first machine part of the machine arrangement and a second carrier element which is fixed at or in a second machine part of the machine arrangement, wherein the second machine part can rotate relatively to the first machine part.
Background
In general, sealing arrangements are known which work with one or more sliding sealing lips to seal a first space against a second space. Also, sealing arrangements are known which have no sliding sealing lips but establish a sealing effect with small gaps, i.e. those sealing arrangements are free of sliding contact.
In the latter case the sealing effect depends significantly on the magnitude of the gap which remains between the respective sealing parts. The manufacturing of the required parts is sometimes costly because a high degree of precision must be obtained to establish a sufficiently small gap. During the manu-
facture and the assembly of such a sealing arrangement the tolerances and the mounting method are critical parts as the gap is the most sensitive variable for the sealing capability, e.g. to resist a pressure difference between the two spaces which are sealed against another.
Thus, it is an o bj e c t of the present invention to further develop a sealing arrangement of the kind mentioned above so that the manufacturing of the required parts is easier and the assembly is not so complex, while in spite of this a high sealing capability is maintained. The realization of the sealing arrangement should be possible in an economic manner.
Summary of the invention
A s o l u t i o n according to the invention is characterized in that at least one magnet is arranged at the first carrier element, wherein a magneto-rheological fluid is arranged at at least a part of the surface of the magnet and/or at at least a part of the surface of a part of the sealing arrangement in which a magnetic field is induced by the magnet, wherein at least a part of the second carrier element is arranged in the proximity of the magneto-rheological fluid, wherein a gap is established between the second carrier element and a surface of the magneto-rheological fluid and wherein a ferro fluid is arranged in the gap.
The first machine part is preferably a housing of the machine arrangement; the second machine part is preferably a rotating shaft. The first carrier element is preferably arranged stationary and the second carrier element rotates relatively to the first carrier element during regular operation of the sealing arrangement.
The magnet is preferably a permanent magnet.
Normally, the carrier elements are at least partly made of iron. Also, the part in which a magnetic field is induced by the magnet can consist at least partially of iron.
The first carrier element can comprise a radially extending section at which the magnet is fixed.
The part in which a magnetic field is induced by the magnet can be arranged at an axial end of the magnet. The second carrier element can have a radially extending section, wherein an axially extending section is arranged at the end of the radially extending section remote from the second machine part. The magneto-rheological fluid can then be arranged in a cup-shaped manner at the part in which a magnetic field is induced by the magnet. Furthermore, a gap can be established between the axially extending section of the second machine part and an axially extending section of the first carrier element. Also, a ferro fluid can be arranged in the gap between the axially extending section of the second machine part and the axially extending section of the first carrier element.
The gaps have preferably a hollow cylindrical shape.
The sealing arrangement is preferably a part of a bearing arrangement.
Thus, the establishment of a proper sealing capability is done using magneto- rheological fluids (MRF) and ferro fluids (FF). The proposed seal design is based on the use of the two mentioned fluids in such a way that the ferro fluid
is located in the gap, so that the size of the remaining gap is minimized. This results in an accurate and extremely think sealing compartment.
The strength of the ferro fluid is based on the strength of the magnetic fields and the gap it is operating in.
The magneto-rheological fluid acts as a semi- solid flux guiding component which is compatible with the ferro fluid. The ferro fluid is used as a seal element and as a lubricant between the magneto-rheological fluid and the adjacent carrier element (flinger). The gap itself is filled with the ferro fluid and can be extremely small.
Thus, the combination of a magneto-rheological fluid and a ferro fluid allows to establish a very small gap between the rotating parts in an easy way. The magneto-rheological fluid will be attracted to the permanent magnet. This creates a layer on the magnet, which will remain in a quasi solid state due to its properties. The magneto-rheological fluid will settle itself and can be smoothened in its shape by the rotating carrier element (flinger). The gap between the magneto-rheological fluid and the carrier element (flinger) will be filled with the ferro fluid which should be compatible with the magneto- rheological fluid.
When the adjacent carrier element (flinger) rotates, a mixed layer or transition layer will be created between the ferro fluid and the magneto-rheological fluid. The transition layer is a stable layer when the magneto-rheological fluid and ferro fluid are compatible with each other. Otherwise, it can happen that churning occurs.
Thereby, the gap can be controlled in width (thickness) more accurately and can be smaller due to the fact that the carrier element (flinger) is able to "polish" the magneto-rheological fluid, keeping the gap extremely small without destroying the two components (magneto-rheological fluid and carrier element) when they would touch.
So, the magnet holds the magneto-rheological fluid in position; the adjacent carrier element (flinger) defines the smoothness of the gap between the carrier element and magneto-rheological fluid during rotation. The ferro fluid which is also attracted by the magnet performs the sealing itself. Due to the fact that the gap (containing the ferro fluid) can be extremely small, the magnetic field will be high, and giving a better sealing effect. The ferro fluid can act as a lubricant between the magneto-rheological fluid and the carrier element (flinger).
Beneficially, the gap can be established with a very small width in an easy way, resulting in a higher magnetic field and resulting in a better sealing performance.
With regard to the employed magneto-rheological fluid and ferro fluid the following information should be given:
Magneto-rheological fluids are dispersions of micron-sized magnetic particles in a liquid carrier, which can reversibly and instantaneously change from a liquid state to a semi-solid or plastic state in the absence or presence of a magnetic field. Moreover, in their on-state (i. e. semi-solid state) these fluids show a viscoplastic behavior, which is characterized by a magnetic field- dependent yield stress.
These main characteristics render magneto-rheological fluids useful for several controlled electro-mechanical applications. The properties of a magneto- rheological fluid are mainly determined by the composition and nature of its magnetic particles, its dispersion additives, and its carrier fluid.
Ferro fluids are colloidal dispersions of magnetic nano-particles which carry a permanent magnetic moment. They have a diameter of around 10 nm, showing single magnetic domains. Several types of particles can be dispersed, such as magnetite and cobalt ferrite.
A significant aspect in magnetic fluids is the particle stabilization in a certain solvent, otherwise the particles will aggregate and separate due to Van-der- Waals interactions. The additional presence of magnetic dipole-dipole interaction also plays a significant role in colloidal stability of ferro fluids, especially when they are subjected to external magnetic fields.
Two distinct types of stabilization are known: steric stabilization and electrostatic stabilization. They can both be present in some cases. Steric stability is obtained by coating the particles with surfactants, which may lead to highly stable colloids (used typically for non-polar solvents). Electrostatic stabilization occurs if the particles become electrically charged (this is seen typically in polar solvents).
When an external magnetic field is applied, the particles tend to align their dipolar moments parallel to the field. This process is called super-para- magnetism. Also, due to increased dipole-dipole interactions, the formation agglomerates is quite likely to occur. Small chain formation is normal, but large structures may destabilize the ferro fluid or lead to undesired effects in
the applications. In well stabilized ferro fluids, the latter phenomenon is less likely to occur.
In general, increasing the particle concentration leads to a strong response of the ferro fluid.
Ferro fluids can be easily positioned or used in many mechanical devices by means of a magnetic field. A variety of phenomena have been observed for these systems in magnetic fields which are appropriate for different applications. These effects must be taken into account when utilizing magnetic fluids in different applications.
Brief description of the drawing
The drawing shows an embodiment of the invention. The only figure shows a radial cross sectional view through a machine arrangement with two machine parts with a sealing arrangement which is arranged effectively between them.
Detailed description of the invention
In the figure a machine arrangement 2 is shown having a first machine part 4 which is a housing and having a second machine part 6 which is a rotating shaft. To seal a first space A against a second space B a sealing arrangement 1 is provided.
The sealing arrangement 1 has two carrier elements, i.e. a first carrier element 3 which is connected with the housing 4 and a second carrier element 5 which is connected with the shaft 6.
The first carrier element 3 has section which runs in axial direction a and which is in press fit connection with the housing 4. Furthermore, the first carrier element 3 has a radial section 3' which runs in radial direction r. At this radial section 3' a permanent magnet 7 is fixed, e.g. by means of an adhesive. The magnet 7 is generally of ring-shape with the radial cross section as depicted.
The second carrier element 5 has also a section which runs in axial direction a; this section is connected with the shaft 6 by press fit. Then, the second carrier element 5 has a radial section 5' which runs in radial direction r. At the end of the radial section 5' a further section is arranged, i. e. an axial section 5" which runs in axial direction a. Thus the second carrier element 5 forms a cup-shaped structure in the radial cross section.
A ferromagnetic part 10, made of a ferromagnetic metal, is arranged at the axial end of the magnet 7 and extends into this cup-shaped structure. The part 10 is generally of ring-shape and is made of iron (Fe430) in the depicted example.
Furthermore, a magneto-rheological fluid 8 is arranged around the surface of the part 10 which forms a respective cup-shaped structure in the cross sectional view and which fits basically into the structure which is formed by the second carrier element 5 with its sections 5' and 5". So, ring-shaped gaps 11 and 12 are given between the second carrier element 5 and the magneto- rheological fluid 8.
The same applies for a magneto-rheological fluid 9 which is arranged at the radial inner end of the radial section 3' of the first carrier element 3. Also here, a gap 13 is formed between the magneto-rheological fluid 9 and the radial outer surface of the second carrier element 5.
Finally, a gap 15 is formed between the axial section 5" of the second carrier element 5 and the first carrier element 3.
In all gaps 11, 12, 13 and 15 a ferro fluid 14 is filled as depicted. Due to the magnetic force which is induced in the adjacent parts by the magnet 7, the ferro fluid 14 is kept in the depicted position.
By this design it is guaranteed that a very small remaining gap only is given between two adjacent parts of the sealing arrangement which are rotating relatively to another during regular operation of the machine arrangement 2.
Reference Numerals:
1 Sealing arrangement
2 Machine arrangement
3 First carrier element
3' Radial section of the first carrier element
4 First machine part
5 Second carrier element
5' Radial section of the second carrier element
5" Axial section of the second carrier element
6 Second machine part
7 Magnet
8 Magneto-rheological fluid
9 Magneto-rheological fluid
10 Part for inducing a magnetic field
11 Gap
12 Gap
13 Gap
14 Ferro fluid
15 Gap
A First space
B Second space
r Radial direction
a Axial direction
Claims
1. Sealing arrangement (1) for sealing a first space (A) against a second space (B) of a machine arrangement (2), comprising a first carrier element (3) which is fixed at or in a first machine part (4) of the machine arrangement (2) and a second carrier element (5) which is fixed at or in a second machine part (6) of the machine arrangement (2), wherein the second machine part (6) can rotate relatively to the first machine part (3), characterized in that at least one magnet (7) is arranged at the first carrier element (3), wherein a magneto-rheological fluid (8, 9) is arranged at at least a part of the surface of the magnet (7) and/or at at least a part of the surface of a part (10) of the sealing arrangement (1) in which a magnetic field is induced by the magnet (7), wherein at least a part of the second carrier element (5) is arranged in the proximity of the magneto-rheological fluid (8, 9), wherein a gap (11, 12, 13) is established between the second carrier element (5) and a surface of the magneto-rheological fluid (8, 9) and wherein a ferro fluid (14) is arranged in the gap (11, 12, 13).
2. Sealing arrangement according to claim 1, characterized in that the first machine part (4) is a housing of the machine arrangement (2).
3. Sealing arrangement according to claim 1 or 2, characterized in that the second machine part (6) is a rotating shaft.
4. Sealing arrangement according to one of claims 1 to 3, characterized in that the first carrier element (3) is arranged stationary and the second carrier element (5) rotates relatively to the first carrier element (3) during regular operation of the sealing arrangement.
5. Sealing arrangement according to one of claims 1 to 4, characterized in that the magnet (7) is a permanent magnet.
6. Sealing arrangement according to one of claims 1 to 5, characterized in that the carrier elements (3, 5) are at least partly made from a ferromagnetic metal.
7. Sealing arrangement according to one of claims 1 to 6, characterized in that the part (10) in which a magnetic field is induced by the magnet (7) is at least partly made from a ferromagnetic metal.
8. Sealing arrangement according to one of claims 1 to 7, characterized in that the first carrier element (3) comprises a radially (r) extending section (3') at which the magnet (7) is fixed.
9. Sealing arrangement according to one of claims 1 to 8, characterized in that the part (10) in which a magnetic field is induced by the magnet (7) is arranged at an axial end of the magnet (7).
10. Sealing arrangement according to one of claims 1 to 9, characterized in that the second carrier element (5) has a radially (r) extending section (5'), wherein an axially (a) extending section (5") is arranged at the end of the radially (r) extending section (5') remote from the second machine part (6).
11. Sealing arrangement according to claim 9 or 10, characterized in that the magneto-rheological fluid (8) is arranged in a cup-shaped manner at the part (10) in which a magnetic field is induced by the magnet (7).
12. Sealing arrangement according to claim 10 or 11, characterized in that a gap (15) is established between the axially (a) extending section (5") of the second carrier element (5) and an axially (a) extending section (3') of the first carrier element (3).
13. Sealing arrangement according to claim 12, characterized in that a ferro fluid (14) is arranged in the gap (15) between the axially (a) extending section (5") of the carrier element (5) and the axially (a) extending section (3') of the first carrier element (3).
14. Sealing arrangement according to one of claims 1 to 13, characterized in that the gaps (11, 12, 13, 15) have a hollow cylindrical shape.
15. Bearing arrangement comprising a sealing arrangement according to one of claims 1 to 14.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1322675.8 | 2013-12-20 | ||
GB1322675.8A GB2521444A (en) | 2013-12-20 | 2013-12-20 | Sealing arrangement |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015091722A1 true WO2015091722A1 (en) | 2015-06-25 |
Family
ID=50071219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2014/078356 WO2015091722A1 (en) | 2013-12-20 | 2014-12-18 | Sealing arrangement |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2521444A (en) |
WO (1) | WO2015091722A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105351528B (en) * | 2015-11-06 | 2018-01-02 | 北京交通大学 | A kind of magnetic liquid magnetic sealing device suitable for high speed conditions |
CN114635925B (en) * | 2022-02-23 | 2024-02-13 | 清华大学 | Magnetic liquid sealing device based on surface texture |
DE102022116014A1 (en) | 2022-06-27 | 2023-12-28 | Inventus Engineering Gmbh | Device with a magnetorheological braking device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3814443A (en) * | 1968-10-28 | 1974-06-04 | Steigerwald Strahltech | Sealing means |
US5007513A (en) * | 1990-04-03 | 1991-04-16 | Lord Corporation | Electroactive fluid torque transmission apparatus with ferrofluid seal |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4527802A (en) * | 1983-03-21 | 1985-07-09 | Mechanical Technology Incorporated | Integral magnetic fluid centrifugal high speed gas seal and method |
JP2013024172A (en) * | 2011-07-23 | 2013-02-04 | Nippon Soken Inc | Fluid brake device and valve timing adjustor |
DE102012101061A1 (en) * | 2012-02-09 | 2013-08-14 | Wittenstein Ag | Sealing device, particularly for transmission for food processing plant, for separating space opposite to another space, has machine element which extends between space and another space, where seal is provided to enclose machine element |
-
2013
- 2013-12-20 GB GB1322675.8A patent/GB2521444A/en not_active Withdrawn
-
2014
- 2014-12-18 WO PCT/EP2014/078356 patent/WO2015091722A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3814443A (en) * | 1968-10-28 | 1974-06-04 | Steigerwald Strahltech | Sealing means |
US5007513A (en) * | 1990-04-03 | 1991-04-16 | Lord Corporation | Electroactive fluid torque transmission apparatus with ferrofluid seal |
Also Published As
Publication number | Publication date |
---|---|
GB201322675D0 (en) | 2014-02-05 |
GB2521444A (en) | 2015-06-24 |
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