CN112212011A - Magnetic liquid sealing device - Google Patents
Magnetic liquid sealing device Download PDFInfo
- Publication number
- CN112212011A CN112212011A CN202011193008.6A CN202011193008A CN112212011A CN 112212011 A CN112212011 A CN 112212011A CN 202011193008 A CN202011193008 A CN 202011193008A CN 112212011 A CN112212011 A CN 112212011A
- Authority
- CN
- China
- Prior art keywords
- rotating shaft
- pole
- bearing
- pole shoe
- peripheral surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
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 discloses a magnetic liquid sealing device, which comprises a shell, a rotating shaft and a shaft sleeve, the permanent magnet type rotating shaft comprises a first pole shoe, a second pole shoe, a permanent magnet and an end cover, wherein a cavity is arranged in the shell, a rotating shaft is rotatably arranged in the cavity, a shaft sleeve is sleeved on the rotating shaft, a plurality of bulges are arranged on the periphery of the shaft sleeve and are arranged at intervals in the axial direction of the rotating shaft, the first pole shoe and the second pole shoe are arranged at intervals in the axial direction of the rotating shaft, a plurality of first pole teeth are arranged on the inner periphery of the first pole shoe and are arranged at intervals in the axial direction of the rotating shaft, the plurality of first pole teeth and the plurality of bulges are arranged oppositely in the radial direction of the rotating shaft, a plurality of second pole teeth are arranged on the inner periphery of the second pole shoe and are arranged at intervals in the axial direction of the rotating shaft, the plurality of second pole teeth and the plurality of bulges are arranged oppositely in the radial direction of the rotating. The invention can reduce the sealing clearance and the injection amount of the magnetic liquid and reduce the sealing starting torque of the magnetic liquid.
Description
Technical Field
The invention relates to the technical field of liquid sealing, in particular to a magnetic liquid sealing device.
Background
The magnetic liquid seal starting torque is the maximum torque input by the rotating shaft in the process that the rotating shaft enters a stable state from a static state. The magnetic liquid sealing starting torque is related to the injection amount of the magnetic liquid, the larger the injection amount of the magnetic liquid is, the larger the actual contact surface area of the magnetic liquid and the rotating shaft at the sealing gap is, and the larger the starting torque required to be overcome during the magnetic liquid sealing starting is. The starting torque of the magnetic liquid seal may exceed the torque range which can be provided by the equipment, so that the equipment cannot normally operate, and the magnetic liquid seal cannot normally work.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, an embodiment of the present invention provides a magnetic liquid seal device capable of reducing a seal gap and an injection amount of magnetic liquid, and reducing a magnetic liquid seal start torque.
The magnetic liquid sealing device according to the embodiment of the invention comprises: a housing having a chamber therein; the rotating shaft is rotatably arranged in the cavity; the shaft sleeve is arranged in the cavity and sleeved on the rotating shaft, a plurality of bulges are arranged on the periphery of the shaft sleeve and are arranged at intervals in the axial direction of the rotating shaft; the first pole shoe and the second pole shoe are arranged at intervals in the axial direction of the rotating shaft, the first pole shoe and the second pole shoe are respectively sleeved on the shaft sleeve, a plurality of first pole teeth are arranged on the inner circumferential surface of the first pole shoe, the first pole teeth are arranged at intervals in the axial direction of the rotating shaft, the first pole teeth and the protrusions are arranged in a radial direction of the rotating shaft in an opposite mode, magnetic liquid is adsorbed between the first pole teeth and the protrusions, a plurality of second pole teeth are arranged on the inner circumferential surface of the second pole shoe, the second pole teeth are arranged at intervals in the axial direction of the rotating shaft, the second pole teeth and the protrusions are arranged in a radial direction of the rotating shaft in an opposite mode, and magnetic liquid is adsorbed between the second pole teeth and the protrusions; the end cover is arranged on one side of the shell and connected with the shell to seal the cavity, and one end of the shaft sleeve is connected with the end cover; the permanent magnet is arranged between the first pole shoe and the second pole shoe.
According to the magnetic liquid sealing device provided by the embodiment of the invention, the sealing gap and the injection amount of the magnetic liquid can be reduced, the magnetic liquid sealing starting torque is reduced, the axial displacement of the shaft sleeve can be prevented, and the sealing stability is improved.
In some embodiments, a gap between the outer peripheral surface of the projection and the inner peripheral surface of the first tooth is less than 0.1mm, and a gap between the outer peripheral surface of the projection and the inner peripheral surface of the second tooth is less than 0.1 mm.
In some embodiments, the projection, the first tooth, and the second tooth have a dimension in the axial direction of the rotating shaft of less than 0.2 mm.
In some embodiments, the hardness of the projection is less than the hardness of the first tooth and the second tooth.
In some embodiments, grooves are formed on the outer peripheral surface of the first pole piece and the outer peripheral surface of the second pole piece, the magnetic liquid sealing device further comprises a first sealing ring and a second sealing ring, the first sealing ring is arranged in the groove on the outer peripheral surface of the first pole piece, and the second sealing ring is arranged in the groove on the outer peripheral surface of the second pole piece.
In some embodiments, the magnetic liquid seal device further comprises an end cap disposed on one side of the housing, the end cap being connected to the housing for sealing the chamber.
In some embodiments, one end of the sleeve is connected to the end cap.
In some embodiments, the magnetic liquid sealing device further includes a first bearing and a second bearing, the first bearing and the second bearing are disposed in the housing, the first bearing and the second bearing are respectively sleeved on the rotating shaft, and peripheries of the first bearing and the second bearing are in contact with an inner wall of the housing.
In some embodiments, the magnetic liquid seal further comprises a positioning ring disposed between the first bearing and the second bearing.
In some embodiments, the magnetic liquid sealing device further includes a first magnetism isolating ring and a second magnetism isolating ring, the first magnetism isolating ring and the second magnetism isolating ring are disposed in the housing, the first magnetism isolating ring surrounds the rotating shaft, an outer peripheral surface of the first magnetism isolating ring contacts with an inner side surface of the housing, the second magnetism isolating ring surrounds the rotating shaft, an outer peripheral surface of the second magnetism isolating ring contacts with an inner side surface of the housing, the first magnetism isolating ring is located between the first bearing and the first pole shoe, and the second magnetism isolating ring is located between the second pole shoe and the end cover.
In some embodiments, the material of the permanent magnet is neodymium iron boron, samarium cobalt or iron cobalt nickel.
Drawings
Fig. 1 is a schematic structural view of a magnetic fluid sealing apparatus according to an embodiment of the present invention.
Fig. 2 is a partially enlarged schematic view of a region a in the magnetic liquid sealing device shown in fig. 1.
Reference numerals:
a housing 1, a flange portion 101, a rotation shaft 2,
the axial sleeve 3, the projection 31,
the first pole shoe 4, the first tooth 41,
the second pole piece 5, the second pole tooth 51,
the magnetic bearing comprises a permanent magnet 6, an end cover 7, a first bearing 8, a second bearing 9, a positioning ring 10, a first magnetism isolating ring 11, a second magnetism isolating ring 12, a first sealing ring 13 and a second sealing ring 14.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 and 2, a magnetic fluid sealing apparatus according to an embodiment of the present invention includes a housing 1, a rotating shaft 2, a shaft sleeve 3, a first pole piece 4, a second pole piece 5, a permanent magnet 6, and an end cap 7.
The housing 1 has a chamber therein. As shown in fig. 1, the left end of the housing 1 is provided with a flange portion 101, the flange portion 101 is provided with a plurality of threaded holes, and the flange portion 101 is adapted to be connected to an external device.
The rotating shaft 2 is rotatably arranged in the cavity. As shown in fig. 1, the rotating shaft 2 is rotatably provided in the chamber in the left-right direction, and both left and right ends of the rotating shaft 2 extend out of the housing 1.
The shaft sleeve 3 is arranged in the cavity, the shaft sleeve 3 is sleeved on the rotating shaft 2, the periphery of the shaft sleeve 3 is provided with a plurality of protrusions 31, and the plurality of protrusions 31 are arranged at intervals in the axial direction (the left and right direction as shown in fig. 1) of the rotating shaft 2. As shown in fig. 1, the shaft sleeve 3 is sleeved on the right side of the rotating shaft 2, and the inner surface of the shaft sleeve 3 is in contact with the outer peripheral surface of the rotating shaft 2.
The first pole shoe 4 and the second pole shoe 5 are arranged at intervals in the axial direction of the rotating shaft 2, and the first pole shoe 4 and the second pole shoe 5 are respectively sleeved on the shaft sleeve 3. The inner peripheral surface of the first pole piece 4 is provided with a plurality of first pole teeth 41, the plurality of first pole teeth 41 are arranged at intervals in the axial direction of the rotating shaft 2, the plurality of first pole teeth 41 and the plurality of protrusions 31 are arranged opposite to each other in the radial direction (the up-down direction shown in fig. 1) of the rotating shaft 2, and magnetic liquid is adsorbed between the plurality of first pole teeth 41 and the plurality of protrusions 31. The inner peripheral surface of the second pole piece 5 is provided with a plurality of second teeth 51, the plurality of second teeth 51 are arranged at intervals in the axial direction of the rotating shaft 2, the plurality of second teeth 51 and the plurality of protrusions 31 are arranged opposite to each other in the radial direction of the rotating shaft 2, and magnetic liquid is adsorbed between the plurality of second teeth 51 and the plurality of protrusions 31.
As shown in fig. 1, the first pole tooth 41 extends in the vertical direction, the profile of the longitudinal section of the first pole tooth 41 is substantially rectangular, a predetermined gap is formed between the inner side surface of the first pole tooth 41 and the outer side surface of the protrusion 31 in the vertical direction, the magnetic liquid is adsorbed in the predetermined gap, the second pole tooth 51 extends in the vertical direction, the profile of the longitudinal section of the second pole tooth 51 is substantially rectangular, a predetermined gap is formed between the inner side surface of the second pole tooth 51 and the outer side surface of the protrusion 31 in the vertical direction, and the magnetic liquid is adsorbed in the predetermined gap. The first pole tooth 41, the second pole tooth 51 and the projection 31 have the same size in the left-right direction, and the size of the shaft sleeve 3 in the left-right direction is larger than the distance between the left end surface of the first pole piece 4 and the right end surface of the second pole piece 5 in the left-right direction.
An end cap 7 is provided at one side of the housing 1, the end cap 7 being connected to the housing 1 for sealing the chamber. As shown in fig. 1, the end cap 7 is disposed at the right side of the housing 1, the end cap 7 is connected to the housing 1 by bolts, and one end of the boss 3 is connected to the end cap 7. The right side of the sleeve 3 is connected to an end cap 7, as shown in fig. 1.
The permanent magnet 6 surrounds the rotating shaft 2, and the permanent magnet 6 is located between the first pole piece 4 and the second pole piece 5. As shown in fig. 1, the left end surface of the permanent magnet 6 is in contact with the right end surface of the first pole shoe 4, the right end surface of the permanent magnet 6 is in contact with the left end surface of the second pole shoe 5, the outer circumferential surface of the permanent magnet 6 is in contact with the inner wall surface of the housing 1, and the inner circumferential surface of the permanent magnet 6 and the outer circumferential surface of the shaft sleeve 3 have a predetermined distance in the vertical direction.
According to the magnetic liquid sealing device provided by the embodiment of the invention, the first pole tooth, the second pole tooth and the bulge are arranged, and the first pole tooth and the bulge are oppositely arranged in the radial direction of the rotating shaft, so that the sealing gap between the first pole shoe and the rotating shaft can be reduced; the second pole teeth and the protrusions are oppositely arranged in the radial direction of the rotating shaft, so that the sealing gap between the second pole shoe and the rotating shaft can be reduced, the injection amount of the magnetic liquid is reduced along with the reduction of the sealing gap, and the sealing starting torque of the magnetic liquid is reduced; the shaft sleeve is connected with the end cover, and the position of the shaft sleeve on the rotating shaft is fixed, so that the shaft sleeve can be prevented from generating axial displacement, and the magnetic liquid seal failure caused by dislocation between the bulge and the first pole tooth and between the bulge and the second pole tooth in the left-right direction is avoided.
In some embodiments, the clearance between the outer peripheral surface of the protrusion 31 and the inner peripheral surface of the first tooth 41 is less than 0.1mm, and the clearance between the outer peripheral surface of the protrusion 31 and the inner peripheral surface of the second tooth 51 is less than 0.1 mm. In the magnetic fluid seal device according to the embodiment of the present invention, the smaller the gap between the outer peripheral surface of the boss 31 and the inner peripheral surface of the first tooth 41 in the vertical direction, the higher the pressure resistance of the magnetic fluid seal, and the smaller the gap between the outer peripheral surface of the boss 31 and the inner peripheral surface of the second tooth 51 in the vertical direction, the higher the pressure resistance of the magnetic fluid seal.
In some embodiments, the protrusion 31, the first tooth 41, and the second tooth 51 have a dimension of less than 0.2mm in the axial direction of the rotating shaft 2. In the magnetic liquid seal device according to the embodiment of the present invention, the smaller the dimensions of the protrusion 31, the first tooth 41, and the second tooth 51 in the left-right direction, the smaller the amount of the magnetic liquid between the protrusion 31 and the first tooth 41, and the smaller the amount of the magnetic liquid between the protrusion 31 and the second tooth 51, and the corresponding magnetic liquid seal activation torque decreases with the decrease in the amount of the magnetic liquid.
In some embodiments, the hardness of the protrusion 31 is less than the hardness of the first tooth 41 and the second tooth 51. According to the magnetic liquid sealing device of the embodiment of the invention, the hardness of the bulge 31 is smaller than that of the first pole tooth 41 and smaller than that of the second pole tooth 51, so that when the shaft sleeve 3 makes radial runout so that the bulge 31 collides with the first pole tooth 41 and the second pole tooth 51, the damage of the bulge 31 to the first pole tooth 41 and the second pole tooth 51 can be reduced, the service life of the sealing device is prolonged, and the stability of the sealing device is improved.
In some embodiments, the first pole piece 4 and the second pole piece 5 are provided with grooves on the outer peripheral surface thereof, and the magnetic liquid sealing device further comprises a first sealing ring 13 and a second sealing ring 14, wherein the first sealing ring 13 is arranged in the groove on the outer peripheral surface of the first pole piece 4, and the second sealing ring 14 is arranged in the groove on the outer peripheral surface of the second pole piece 5. According to the magnetic liquid sealing device provided by the embodiment of the invention, the leakage of the magnetic liquid between the outer circular surface of the pole shoe and the inner wall surface of the shell 1 can be avoided by arranging the first sealing ring 13 and the second sealing ring 14, so that the sealing property of the magnetic liquid is improved.
In some embodiments, the magnetic liquid sealing device further includes a first bearing 8 and a second bearing 9, the first bearing 8 and the second bearing 9 are disposed in the housing 1, the first bearing 8 and the second bearing 9 are respectively sleeved on the rotating shaft 2, and the peripheries of the first bearing 8 and the second bearing 9 are in contact with the inner wall of the housing 1. As shown in fig. 1, the first bearing 8 and the second bearing 9 are provided on the left side of the first pole piece 4, and the first bearing 8 and the second bearing 9 are arranged at an interval in the left-right direction. According to the magnetic liquid sealing device provided by the embodiment of the invention, the friction between the rotating shaft 2 and the shell 1 is reduced by arranging the first bearing 8 and the second bearing 9, so that the rotation of the rotating shaft 2 is more stable.
In some embodiments, the magnetic liquid seal further comprises a positioning ring 10, the positioning ring 10 being arranged between the first bearing 8 and the second bearing 9. As shown in fig. 1, the left end surface of the positioning ring 10 contacts with the right end surface of the first bearing 8, the positioning ring 10 contacts with the outer ring of the first bearing 8, the right end surface of the positioning ring 10 contacts with the left end surface of the second bearing 9, and the positioning ring 10 contacts with the outer ring of the second bearing 9. According to the magnetic liquid sealing device provided by the embodiment of the invention, the positioning ring 10 is arranged to position and fix the axial positions of the first bearing 8 and the second bearing 9, so that the first bearing 8 and the second bearing 9 are prevented from generating axial displacement, and the running stability of the magnetic liquid sealing device is improved.
In some embodiments, the magnetic liquid sealing device further includes a first magnetism isolating ring 11 and a second magnetism isolating ring 12, the first magnetism isolating ring 11 and the second magnetism isolating ring 12 are disposed in the housing 1, the first magnetism isolating ring 11 surrounds the rotating shaft 2, the outer peripheral surface of the first magnetism isolating ring 11 contacts with the inner side surface of the housing 1, the second magnetism isolating ring 12 surrounds the rotating shaft 2, the outer peripheral surface of the second magnetism isolating ring 12 contacts with the inner side surface of the housing 1, the first magnetism isolating ring 11 is located between the first bearing 8 and the first pole shoe 4, and the second magnetism isolating ring 12 is located between the second pole shoe 5 and the end cover 7.
As shown in fig. 1, the left end surface of the first magnetism isolating ring 11 is in contact with the right end surface of the second bearing 9, the right end surface of the first magnetism isolating ring 11 is in contact with the left end surface of the first pole shoe 4, the left end surface of the second magnetism isolating ring 12 is in contact with the right end surface of the second pole shoe 5, and the right end surface of the second magnetism isolating ring 12 is in contact with the left end surface of the end cover 7.
In some embodiments, the material of the permanent magnet 6 is neodymium iron boron, samarium cobalt, or iron cobalt nickel. It is to be understood that the material of the permanent magnet 6 is not limited thereto, and may also be alnico, for example.
A magnetic liquid seal apparatus according to some specific examples of the present invention is described below with reference to fig. 1 and 2.
The magnetic liquid sealing device according to the embodiment of the invention comprises a shell 1, a rotating shaft 2, a shaft sleeve 3, a first pole shoe 4, a second pole shoe 5, a permanent magnet 6, a first sealing ring, a second sealing ring, an end cover 7, a first bearing 8, a second bearing 9, a positioning ring 10, a first magnetism isolating ring 11 and a second magnetism isolating ring 12.
The housing 1 has a chamber therein.
The rotating shaft 2 is horizontally and rotatably arranged in the cavity along the left and right directions, and the left end and the right end of the rotating shaft 2 extend out of the shell 1.
The shaft sleeve 3 is arranged in the cavity, the shaft sleeve 3 is sleeved on the right side of the rotating shaft 2, the inner surface of the shaft sleeve 3 is in contact with the outer peripheral surface of the rotating shaft 2, a plurality of bulges 31 are arranged on the periphery of the shaft sleeve 3, and the bulges 31 are arranged at intervals in the left and right directions.
The first pole piece 4 and the second pole piece 5 are respectively sleeved on the shaft sleeve 3, the first pole piece 4 and the second pole piece 5 are arranged at intervals in the left-right direction, a plurality of first pole teeth 41 are arranged on the inner circumferential surface of the first pole piece 4, the plurality of first pole teeth 41 are arranged at intervals in the left-right direction, the plurality of first pole teeth 41 and the plurality of protrusions 31 are arranged oppositely in the up-down direction, magnetic liquid is adsorbed between the plurality of first pole teeth 41 and the plurality of protrusions 31, a plurality of second pole teeth 51 are arranged on the inner circumferential surface of the second pole piece 5, the plurality of second pole teeth 51 are arranged at intervals in the left-right direction, the plurality of second pole teeth 51 and the plurality of protrusions 31 are arranged oppositely in the up-down direction, and magnetic liquid is adsorbed between the plurality of second pole teeth 51 and the plurality of protrusions 31.
Grooves are formed in the outer peripheral surface of the first pole shoe 4 and the outer peripheral surface of the second pole shoe 5, the first sealing ring is arranged in the groove in the outer peripheral surface of the first pole shoe 4, and the second sealing ring is arranged in the groove in the outer peripheral surface of the second pole shoe 5.
The first pole tooth 41 extends along the vertical direction, the profile of the longitudinal section of the first pole tooth 41 is approximately rectangular, a preset gap is formed between the inner side surface of the first pole tooth 41 and the outer side surface of the protrusion 31 in the vertical direction, the magnetic liquid is adsorbed in the preset gap, the second pole tooth 51 extends along the vertical direction, the profile of the longitudinal section of the second pole tooth 51 is approximately rectangular, a preset gap is formed between the inner side surface of the second pole tooth 51 and the outer side surface of the protrusion 31 in the vertical direction, and the magnetic liquid is adsorbed in the preset gap. The first pole tooth 41, the second pole tooth 51 and the projection 31 have the same size in the left-right direction, and the size of the shaft sleeve 3 in the left-right direction is larger than the distance between the left end surface of the first pole piece 4 and the right end surface of the second pole piece 5 in the left-right direction.
The permanent magnet 6 surrounds the rotating shaft 2, and the permanent magnet 6 is located between the first pole piece 4 and the second pole piece 5. The left end face of the permanent magnet 6 is in contact with the right end face of the first pole shoe 4, the right end face of the permanent magnet 6 is in contact with the left end face of the second pole shoe 5, the outer peripheral face of the permanent magnet 6 is in contact with the inner wall face of the shell 1, and the inner peripheral face of the permanent magnet 6 and the outer peripheral face of the shaft sleeve 3 are spaced in the vertical direction by a preset distance.
The end cover 7 is arranged at the right side of the shell 1, and the end cover 7 is connected with the shell 1 through bolts to seal the cavity. The right side of the sleeve 3 is connected to an end cap 7.
First bearing 8 and second bearing 9 are established in casing 1, and first bearing 8 and second bearing 9 overlap respectively and are established on pivot 2, and the periphery of first bearing 8 and second bearing 9 contacts with the inner wall of casing 1. The first bearing 8 and the second bearing 9 are both provided on the left side of the first pole piece 4, and the first bearing 8 and the second bearing 9 are arranged at an interval in the left-right direction.
The left end face of holding ring 10 contacts with the right-hand member face of first bearing 8, and holding ring 10 contacts with the outer lane of first bearing 8, and the right-hand member face of holding ring 10 contacts with the left end face of second bearing 9, and holding ring 10 contacts with the outer lane of second bearing 9.
The first magnetism isolating ring 11 and the second magnetism isolating ring 12 are arranged in the shell 1, the first magnetism isolating ring 11 surrounds the rotating shaft 2, the outer peripheral surface of the first magnetism isolating ring 11 is in contact with the inner side surface of the shell 1, the second magnetism isolating ring 12 surrounds the rotating shaft 2, and the outer peripheral surface of the second magnetism isolating ring 12 is in contact with the inner side surface of the shell 1. The left end face of the first magnetism isolating ring 11 is in contact with the right end face of the second bearing 9, the right end face of the first magnetism isolating ring 11 is in contact with the left end face of the first pole shoe 4, the left end face of the second magnetism isolating ring 12 is in contact with the right end face of the second pole shoe 5, and the right end face of the second magnetism isolating ring 12 is in contact with the left end face of the end cover 7. According to the magnetic liquid sealing device provided by the embodiment of the invention, the first magnetism isolating ring and the second magnetism isolating ring are arranged, so that the magnetic resistance of a magnetic circuit is increased, and the magnetic liquid is adsorbed between the first pole teeth and the bulges and between the second pole teeth and the bulges.
The operation principle of the magnetic fluid sealing apparatus of the embodiment of the present invention is described below with reference to fig. 1 and 2.
According to the magnetic liquid sealing device provided by the embodiment of the invention, the first pole tooth 41 and the bulge 31 are arranged in a vertical direction in a relative mode, so that the sealing gap between the first pole shoe 4 and the rotating shaft 2 is reduced, the second pole tooth 51 and the bulge 31 are arranged in a vertical direction in a relative mode, so that the sealing gap between the second pole shoe 5 and the rotating shaft 2 is reduced, the injection amount of magnetic liquid between the shaft sleeve 3 and the first pole shoe 4 and the injection amount of magnetic liquid between the shaft sleeve 3 and the second pole shoe 5 are reduced along with the reduction of the sealing gap, and therefore the magnetic liquid sealing starting torque is reduced.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A magnetic fluid seal assembly, comprising:
a housing having a chamber therein;
the rotating shaft is rotatably arranged in the cavity;
the shaft sleeve is arranged in the cavity and sleeved on the rotating shaft, a plurality of bulges are arranged on the periphery of the shaft sleeve and are arranged at intervals in the axial direction of the rotating shaft;
the first pole shoe and the second pole shoe are arranged at intervals in the axial direction of the rotating shaft, the first pole shoe and the second pole shoe are respectively sleeved on the shaft sleeve, a plurality of first pole teeth are arranged on the inner circumferential surface of the first pole shoe, the first pole teeth are arranged at intervals in the axial direction of the rotating shaft, the first pole teeth and the protrusions are arranged in a radial direction of the rotating shaft in an opposite mode, magnetic liquid is adsorbed between the first pole teeth and the protrusions, a plurality of second pole teeth are arranged on the inner circumferential surface of the second pole shoe, the second pole teeth are arranged at intervals in the axial direction of the rotating shaft, the second pole teeth and the protrusions are arranged in a radial direction of the rotating shaft in an opposite mode, and magnetic liquid is adsorbed between the second pole teeth and the protrusions;
the end cover is arranged on one side of the shell and connected with the shell to seal the cavity, and one end of the shaft sleeve is connected with the end cover;
the permanent magnet is arranged between the first pole shoe and the second pole shoe.
2. The magnetic fluid sealing device according to claim 1, wherein a gap between the outer peripheral surface of the protrusion and the inner peripheral surface of the first tooth is less than 0.1mm, and a gap between the outer peripheral surface of the protrusion and the inner peripheral surface of the second tooth is less than 0.1 mm.
3. The magnetic-fluid seal apparatus of claim 1, wherein the projection, the first tooth, and the second tooth have a dimension in the axial direction of the rotating shaft of less than 0.2 mm.
4. The magnetic-fluid seal apparatus of claim 1, wherein a hardness of said projection is less than a hardness of said first tooth and said second tooth.
5. The magnetic fluid seal apparatus of claim 1, wherein grooves are formed on the outer peripheral surface of the first pole piece and the outer peripheral surface of the second pole piece,
the magnetic liquid sealing device further comprises a first sealing ring and a second sealing ring, the first sealing ring is arranged in a groove in the outer peripheral surface of the first pole shoe, and the second sealing ring is arranged in a groove in the outer peripheral surface of the second pole shoe.
6. The magnetic liquid sealing device according to claim 1, further comprising a first bearing and a second bearing, wherein the first bearing and the second bearing are disposed in a housing, the first bearing and the second bearing are respectively sleeved on the rotating shaft, and peripheries of the first bearing and the second bearing are in contact with an inner wall of the housing.
7. The magnetic fluid seal apparatus of claim 6 further comprising a retaining ring disposed between said first bearing and said second bearing.
8. The magnetic fluid sealing device of claim 7, further comprising a first magnetism isolating ring and a second magnetism isolating ring, wherein the first magnetism isolating ring and the second magnetism isolating ring are disposed in the housing, the first magnetism isolating ring surrounds the rotating shaft, an outer peripheral surface of the first magnetism isolating ring contacts with an inner side surface of the housing, the second magnetism isolating ring surrounds the rotating shaft, an outer peripheral surface of the second magnetism isolating ring contacts with an inner side surface of the housing, the first magnetism isolating ring is located between the first bearing and the first pole shoe, and the second magnetism isolating ring is located between the second pole shoe and the end cap.
9. The magnetic fluid seal of any one of claims 1 to 8, wherein the material of said permanent magnet is neodymium iron boron, samarium cobalt or iron cobalt nickel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011193008.6A CN112212011A (en) | 2020-10-30 | 2020-10-30 | Magnetic liquid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011193008.6A CN112212011A (en) | 2020-10-30 | 2020-10-30 | Magnetic liquid sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112212011A true CN112212011A (en) | 2021-01-12 |
Family
ID=74057704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011193008.6A Pending CN112212011A (en) | 2020-10-30 | 2020-10-30 | Magnetic liquid sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112212011A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728110A (en) * | 2021-01-13 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device |
| CN112728111A (en) * | 2021-01-18 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device |
| CN112963545A (en) * | 2021-03-19 | 2021-06-15 | 清华大学 | Magnetic liquid sealing device and assembling method thereof |
| CN113108064A (en) * | 2021-04-29 | 2021-07-13 | 北京交通大学 | Modularized magnetic liquid sealing device |
| CN113374872A (en) * | 2021-07-15 | 2021-09-10 | 北京交通大学 | Magnetic fluid seal using magnetic source with radial through hole structure |
| CN113669459A (en) * | 2021-07-20 | 2021-11-19 | 清华大学 | Magnetic liquid sealing device for reducing starting torque |
| CN113833858A (en) * | 2021-11-02 | 2021-12-24 | 北京交通大学 | Magnetic powder sealing liquid device with fluid dynamic pressure reverse conveying function |
| CN114110172A (en) * | 2021-12-03 | 2022-03-01 | 清华大学 | Magnetic liquid sealing device with surface texture |
| CN114294424A (en) * | 2021-12-10 | 2022-04-08 | 清华大学 | Magnetic liquid sealing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201262230Y (en) * | 2008-09-27 | 2009-06-24 | 江苏华盛天龙机械股份有限公司 | Hollow shaft magnetic fluid sealing device without locking device |
| CN102182830A (en) * | 2011-05-05 | 2011-09-14 | 北京交通大学 | Rotary sealing device for magnetic liquid |
| CN106545658A (en) * | 2016-12-29 | 2017-03-29 | 北京交通大学 | Magnetic fluid seal device magnetic liquid teeth groove injection method |
| CN109595345A (en) * | 2019-01-24 | 2019-04-09 | 清华大学 | With the magnetic fluid seal device for preventing namagnetic substance anti-contamination function |
-
2020
- 2020-10-30 CN CN202011193008.6A patent/CN112212011A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201262230Y (en) * | 2008-09-27 | 2009-06-24 | 江苏华盛天龙机械股份有限公司 | Hollow shaft magnetic fluid sealing device without locking device |
| CN102182830A (en) * | 2011-05-05 | 2011-09-14 | 北京交通大学 | Rotary sealing device for magnetic liquid |
| CN106545658A (en) * | 2016-12-29 | 2017-03-29 | 北京交通大学 | Magnetic fluid seal device magnetic liquid teeth groove injection method |
| CN109595345A (en) * | 2019-01-24 | 2019-04-09 | 清华大学 | With the magnetic fluid seal device for preventing namagnetic substance anti-contamination function |
Non-Patent Citations (1)
| Title |
|---|
| 程艳红等: ""氟醚油基磁性液体密封启动力矩的实验分析"", 《哈尔滨工程大学学报》 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728110A (en) * | 2021-01-13 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device |
| CN112728111A (en) * | 2021-01-18 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device |
| CN112963545B (en) * | 2021-03-19 | 2022-02-25 | 清华大学 | Magnetic liquid sealing device and assembling method thereof |
| CN112963545A (en) * | 2021-03-19 | 2021-06-15 | 清华大学 | Magnetic liquid sealing device and assembling method thereof |
| CN113108064B (en) * | 2021-04-29 | 2022-03-25 | 北京交通大学 | Modularized magnetic liquid sealing device |
| CN113108064A (en) * | 2021-04-29 | 2021-07-13 | 北京交通大学 | Modularized magnetic liquid sealing device |
| CN113374872A (en) * | 2021-07-15 | 2021-09-10 | 北京交通大学 | Magnetic fluid seal using magnetic source with radial through hole structure |
| CN113669459A (en) * | 2021-07-20 | 2021-11-19 | 清华大学 | Magnetic liquid sealing device for reducing starting torque |
| CN113833858A (en) * | 2021-11-02 | 2021-12-24 | 北京交通大学 | Magnetic powder sealing liquid device with fluid dynamic pressure reverse conveying function |
| CN113833858B (en) * | 2021-11-02 | 2024-01-30 | 北京交通大学 | Magnetic powder sealing liquid device with fluid dynamic pressure feedback |
| CN114110172A (en) * | 2021-12-03 | 2022-03-01 | 清华大学 | Magnetic liquid sealing device with surface texture |
| CN114110172B (en) * | 2021-12-03 | 2023-03-10 | 清华大学 | Magnetic liquid sealing device with surface texture |
| CN114294424A (en) * | 2021-12-10 | 2022-04-08 | 清华大学 | Magnetic liquid sealing device |
| CN114294424B (en) * | 2021-12-10 | 2022-06-03 | 清华大学 | Magnetic liquid sealing device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112212011A (en) | Magnetic liquid sealing device | |
| CN112431927B (en) | Magnetic liquid sealing device | |
| CN112178200B (en) | Magnetic liquid sealing device | |
| CN112049938B (en) | Capillary magnetic liquid sealing device | |
| CN113653805B (en) | Magnetic liquid sealing device | |
| CN112112971B (en) | Floating ring type magnetic liquid sealing device | |
| CN112728101B (en) | Magnetic liquid sealing device | |
| CN112178204B (en) | Labyrinth type magnetic liquid sealing device | |
| CN112178202B (en) | Magnetic liquid sealing device for sealing dust | |
| CN112728100A (en) | Magnetic liquid sealing device | |
| CN214036892U (en) | Magnetic liquid sealing device | |
| CN112648382B (en) | Magnetic liquid sealing device | |
| CN112728110B (en) | Magnetic liquid sealing device | |
| CN112728102B (en) | Magnetic liquid sealing device | |
| CN112161065B (en) | Magnetic liquid sealing device for stirrer | |
| CN113154043B (en) | Sealing device combining mechanical seal and magnetic liquid seal | |
| CN112963545B (en) | Magnetic liquid sealing device and assembling method thereof | |
| CN112728111B (en) | Magnetic liquid sealing device | |
| CN112728109B (en) | Magnetic liquid sealing device with embedded permanent magnet | |
| CN113639047A (en) | Magnetic liquid sealing device | |
| CN216589954U (en) | Magnetic liquid sealing device | |
| CN113639046B (en) | Magnetic liquid sealing device | |
| CN215334474U (en) | Magnetic liquid sealing device | |
| CN112728113B (en) | Magnetic liquid sealing device | |
| CN112728107B (en) | Magnetic liquid sealing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210112 |
|
| RJ01 | Rejection of invention patent application after publication |