CN112431927B - Magnetic liquid sealing device - Google Patents
Magnetic liquid sealing device Download PDFInfo
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- CN112431927B CN112431927B CN202011339436.5A CN202011339436A CN112431927B CN 112431927 B CN112431927 B CN 112431927B CN 202011339436 A CN202011339436 A CN 202011339436A CN 112431927 B CN112431927 B CN 112431927B
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- rotating shaft
- pole
- pole piece
- permanent magnet
- bearing
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- 238000007789 sealing Methods 0.000 title claims abstract description 104
- 239000007788 liquid Substances 0.000 title claims abstract description 52
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 230000005389 magnetism Effects 0.000 claims description 49
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 239000011553 magnetic fluid Substances 0.000 claims description 15
- 230000007774 longterm Effects 0.000 abstract description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 46
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- 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
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- 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, a first pole shoe and a second pole shoe, a permanent magnet and a first driving piece, wherein a cavity is formed in the shell, the rotating shaft is rotatably arranged on the shell in a penetrating mode, at least part of the rotating shaft is located in the cavity, the first pole shoe and the second pole shoe are arranged in the axial direction of the rotating shaft at intervals, the first pole shoe and the second pole shoe are respectively sleeved on the rotating shaft in a sleeved mode, the permanent magnet is wound on the rotating shaft, the permanent magnet is located between the first pole shoe and the second pole shoe in the axial direction of the rotating shaft, and the first driving piece is used for driving at least one of the first pole shoe and the permanent magnet to enable the first pole shoe and the permanent magnet to be in contact with each other and to be away from each other in the axial direction of the rotating shaft. The magnetic liquid sealing device has the characteristics of simple structure, strong reliability and long-term placement.
Description
Technical Field
The invention relates to the technical field of mechanical engineering sealing, in particular to a magnetic liquid sealing device.
Background
Magnetic liquid seals are used in more and more industries because of their zero leakage, high reliability, long life, no pollution, etc. The working principle of the magnetic liquid seal is that under the action of a magnetic field generated by a permanent magnet, the magnetic liquid placed between a rotating shaft and a gap at the top end of a pole tooth is concentrated to form an O-shaped ring, and a gap channel is blocked to achieve the purpose of sealing.
The stability of magnetic fluid plays the crucial effect to sealed effect, because the operating mode demand, when magnetic fluid sealing device placed a period of time, or intermittent type is used again after very long period, magnetic fluid then can slowly subside under the effect of magnetic field, finally leads to magnetic particle and the separation of base carrier liquid of magnetic fluid, leads to sealing device's inefficacy. Therefore, the problem of the stability reduction of the magnetic liquid due to the long-term storage and parking of the magnetic liquid seal is to be solved.
Disclosure of Invention
Therefore, the embodiment of the invention provides the magnetic liquid sealing device which is simple in structure, strong in reliability and capable of being placed for a long time.
The magnetic liquid sealing device comprises a shell, a rotating shaft, a first pole shoe and a second pole shoe, a permanent magnet and a first driving piece, wherein a cavity is formed in the shell, the rotating shaft is rotatably arranged on the shell in a penetrating mode, at least part of the rotating shaft is located in the cavity, the first pole shoe and the second pole shoe are arranged in an axial direction of the rotating shaft at intervals, the first pole shoe and the second pole shoe are respectively sleeved on the rotating shaft, a plurality of first pole teeth are arranged on the inner circumferential surface of the first pole shoe, the inner circumferential surface of each first pole tooth and the outer circumferential surface of the rotating shaft are arranged in a radial direction of the rotating shaft at intervals to form a first sealing gap, a plurality of first pole teeth are arranged in the axial direction of the rotating shaft at intervals, magnetic liquid is adsorbed in the first sealing gap, a plurality of second pole teeth are arranged on the inner circumferential surface of the second pole shoe, and the inner circumferential surface of each second pole tooth and the outer circumferential surface of the rotating shaft are arranged in the radial direction of the rotating shaft at intervals to form a first sealing gap And a second sealing gap is formed, a plurality of second pole teeth are arranged at intervals in the axial direction of the rotating shaft, a magnetic liquid is adsorbed in the second sealing gap, the permanent magnet is wound on the rotating shaft, the permanent magnet is positioned between the first pole shoe and the second pole shoe in the axial direction of the rotating shaft, and the first driving piece is used for driving at least one of the first pole shoe and the permanent magnet so as to enable the first pole shoe and the permanent magnet to be in contact with each other and to be away from each other in the axial direction of the rotating shaft.
According to the magnetic liquid sealing device provided by the embodiment of the invention, the contact between the first pole shoe and the permanent magnet can be cut off when the magnetic liquid sealing device is stored for a long time and is stopped, the sedimentation of the magnetic liquid is reduced, and the stability of the magnetic liquid is enhanced.
In some embodiments, the first driving member comprises an elastic member disposed between the first pole piece and the permanent magnet and having an elastic force urging the first pole piece and the permanent magnet away from each other, and in the working state of the magnetic liquid sealing device, a pressure difference between both sides of the housing in a length direction thereof is adapted to overcome the elastic force of the elastic member to bring the first pole piece and the permanent magnet into contact with each other.
In some embodiments, the elastic member is a spring, a groove is formed on one side of the first pole piece adjacent to the permanent magnet, at least part of the spring is arranged in the groove, one end of the spring is connected with the first pole piece, and the other end of the spring is connected with the permanent magnet.
In some embodiments, the magnetic liquid sealing device further includes a second driving member for driving at least one of the second pole piece and the permanent magnet to contact and move away from each other in an axial direction of the rotating shaft.
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 a chamber, the first bearing and the second bearing are respectively sleeved on the rotating shaft, an outer circumference of the first bearing and an outer circumference of the second bearing are respectively in contact with an inner circumferential surface of the housing, and the first pole shoe, the permanent magnet, and the second pole shoe are located between the first bearing and the second bearing.
In some embodiments, the housing includes a cylinder, a first end cap and a second end cap, the chamber is formed in the cylinder, the first end cap is disposed at one end of the housing, the second end cap is disposed at the other end of the housing, the rotating shaft is disposed on the first end cap and/or the second end cap in a penetrating manner, and the first bearing and the second bearing are disposed between the first end cap and the second end cap.
In some embodiments, the magnetic liquid sealing device further includes a sealing member, the second end cover includes a first end face and a second end face which are oppositely arranged in the axial direction of the rotating shaft, the first end face of the second end cover is adjacent to the housing than the second end face of the second end cover, the first end face of the second end cover is provided with a sealing groove, and the sealing member is disposed in the sealing groove and is in contact with the housing.
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 both disposed in the cavity, the first magnetism isolating ring and the second magnetism isolating ring are respectively sleeved on the rotating shaft, an outer circumferential surface of the first magnetism isolating ring and an outer circumferential surface of the second magnetism isolating ring are respectively in contact with an inner circumferential surface of the housing, the first magnetism isolating ring is disposed between the first bearing and the first pole shoe, and the second magnetism isolating ring is disposed between the second pole shoe and the second bearing.
In some embodiments, the magnetic liquid sealing device further includes a positioning ring, the positioning ring is sleeved on the rotating shaft, and the positioning ring is disposed in the cavity and located between the first magnetism isolating ring and the first pole shoe.
In some embodiments, grooves are formed in the outer circumferential surface of the first pole piece and the outer circumferential surface of the second pole piece, the magnetic liquid sealing device further includes a first sealing ring and a second sealing ring, the first sealing ring is disposed in the groove of the first pole piece, the second sealing ring is disposed in the groove of the second pole piece, and the outer circumferential surfaces of the first sealing ring and the second sealing ring are respectively in contact with the inner circumferential surface of the housing.
Drawings
Fig. 1 is a schematic structural view of the magnetic liquid sealing device in an operating state.
Fig. 2 is a schematic structural diagram of the magnetic liquid sealing device in an inoperative state.
Fig. 3 is a partially enlarged schematic view of the magnetic fluid sealing device shown in fig. 2 at a.
Reference numerals:
the magnetic pump comprises a shell 1, a chamber 101, a cylinder 102, a first end cover 103, a second end cover 104, a rotating shaft 2, a first pole shoe 3, a first pole tooth 301, a first sealing gap 302, a second pole shoe 4, a second pole tooth 401, a second sealing gap 402, a permanent magnet 5, a first driving piece 6, an elastic piece 601, a first bearing 7, a second bearing 8, a sealing piece 9, a sealing groove 10, a first magnetism isolating ring 11, a second magnetism isolating ring 12, a positioning ring 13, a first sealing ring 14 and a second sealing ring 15.
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.
A magnetic liquid sealing apparatus according to an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1, a magnetic fluid sealing device according to an embodiment of the present invention includes a housing 1, a rotating shaft 2, first and second pole pieces 3 and 4, a permanent magnet 5, and a first driving member 6.
The casing 1 is provided with a cavity 101 therein, the rotating shaft 2 is rotatably arranged on the casing 1 in a penetrating manner, at least part of the rotating shaft 2 is arranged in the cavity 101, as shown in fig. 1, the rotating shaft 2 extends along the left-right direction, the rotating shaft 2 is arranged on the casing 1 and is rotatable relative to the casing 1, a part of the rotating shaft 2 is arranged in the cavity 101, and both ends of the rotating shaft 2 extend out of the casing 1.
The first pole piece 3 and the second pole piece 4 are arranged at intervals in the axial direction (the left-right direction shown in fig. 1) of the rotating shaft 2, the first pole piece 3 and the second pole piece 4 are respectively sleeved on the rotating shaft 2, the inner circumferential surface of the first pole piece 3 is provided with a plurality of first pole teeth 301, the inner circumferential surface of the first pole teeth 301 and the outer circumferential surface of the rotating shaft 2 are arranged at intervals in the radial direction (the up-down direction shown in fig. 1) of the rotating shaft 2 to form a first sealing gap 302, the plurality of first pole teeth 301 are arranged at intervals in the axial direction of the rotating shaft 2, and magnetic liquid is adsorbed in the first sealing gap 302.
The inner peripheral surface of the second pole piece 4 is provided with a plurality of second pole teeth 401, the inner peripheral surface of the second pole teeth 401 and the outer peripheral surface of the rotating shaft 2 are arranged at intervals in the radial direction of the rotating shaft 2 to form a second sealing gap 402, the plurality of second pole teeth 401 are arranged at intervals in the axial direction of the rotating shaft 2, and magnetic liquid is adsorbed in the second sealing gap 402.
As shown in fig. 1, a first pole tooth 301 is disposed below the first pole piece 3, an inner circumferential surface of the first pole tooth 301 and an outer circumferential surface of the rotating shaft 2 are arranged at an interval in the vertical direction to form a first seal gap 302, and the magnetic liquid is adsorbed in the first seal gap 302. The second pole piece 4 is spaced from the first pole piece 3 in the left-right direction and is located on the right side of the first pole piece 3, the second pole tooth 401 is arranged below the second pole piece 4, the inner circumferential surface of the second pole tooth 401 and the outer circumferential surface of the rotating shaft 2 are arranged at an interval in the up-down direction to form a second sealing gap 402, and magnetic liquid is adsorbed in the second sealing gap 402.
The permanent magnet 5 surrounds the rotating shaft 2, the permanent magnet 5 is located between the first pole shoe 3 and the second pole shoe 4 in the axial direction of the rotating shaft 2, as shown in fig. 1, the left end face of the permanent magnet 5 is in contact with the right end face of the first pole shoe 3, the right end face of the permanent magnet 5 is in contact with the left end face of the second pole shoe 4, the outer peripheral face of the permanent magnet 5 is in contact with the inner peripheral face of the shell 1, and the inner peripheral face of the permanent magnet 5 and the outer peripheral face of the rotating shaft 2 are spaced in the up-down direction.
The first driving member 6 is used to drive at least one of the first pole piece 3 and the permanent magnet 5 so that the first pole piece 3 and the permanent magnet 5 are in contact with each other and away from each other in the axial direction of the rotating shaft 2.
As shown in fig. 1, the first driving member 6 is located between the first pole piece 3 and the permanent magnet 5, and when an external pressure is applied, a distance between the first pole piece 3 and the permanent magnet 5 is compressed, and the first pole piece 3 is in contact with the permanent magnet 5, and when the external pressure is not applied, the first driving member 6 drives the first pole piece 3 to be away from the permanent magnet 5 in an axial direction of the rotating shaft 2.
In other embodiments, the first drive member 6 drives the permanent magnet 5 away from the first pole piece 3 in the axial direction of the shaft 2. In further embodiments, the first driving member 6 drives the first pole piece 3 and the permanent magnet 5 to move the first pole piece 3 and the permanent magnet 5 away from each other in the axial direction of the rotating shaft 2.
According to the magnetic liquid sealing device provided by the embodiment of the invention, when the magnetic liquid sealing device works, the first pole shoe 3 is in contact with the permanent magnet 5, the first pole shoe 3 and the second pole shoe 4 are under the action of a magnetic field, so that the magnetic liquid adsorbed below the first pole tooth 301 and the second pole tooth 401 moves to seal the first sealing gap 302 and the second sealing gap 402, and when the device needs to be stored for a long time and is stopped, the first driving piece 6 is used for disconnecting the first pole shoe 3 from the permanent magnet 5, the action of the magnetic field force on the magnetic liquid is reduced, the sedimentation of the magnetic liquid is slowed down, and the stability of the magnetic liquid is enhanced.
In some embodiments, the first driving member 6 comprises an elastic member 601, the elastic member 601 is disposed between the first pole piece 3 and the permanent magnet 5 and has an elastic force urging the first pole piece 3 and the permanent magnet 5 away from each other, and in the working state of the magnetic liquid sealing device, a pressure difference between two sides of the housing 1 in a length direction thereof (a left-right direction as shown in fig. 1) is adapted to overcome the elastic force of the elastic member 601 to bring the first pole piece 3 and the permanent magnet 5 into contact with each other.
As shown in fig. 1, an elastic member 601 is disposed between the first pole piece 3 and the permanent magnet 5, and an elastic force of the elastic member 601 can make the first pole piece 3 and the permanent magnet 5 move away from each other in an inoperative state, but the elastic force of the elastic member 601 is smaller than a pressure difference between the left side and the right side of the housing 1 in an operative state, so that the first pole piece 3 and the permanent magnet 5 contact each other in the operative state.
In some embodiments, the elastic member 601 is a spring, a groove is formed on a side of the first pole piece 3 adjacent to the permanent magnet 5, at least a portion of the spring is disposed in the groove, one end of the spring is connected to the first pole piece 3, and the other end of the spring is connected to the permanent magnet 5.
As shown in fig. 1, a plurality of grooves are uniformly formed in the right end face of the first pole shoe 3, the left end of the spring is arranged in the grooves, the left end of the spring is connected with the first pole shoe 3, the right end of the spring extends out of the grooves and is connected with the permanent magnet 5, and at the moment, a certain gap is formed between the right end face of the first pole shoe 3 and the left end face of the permanent magnet 5.
In some embodiments, the magnetic liquid sealing apparatus further includes a second driving member (not shown in the drawings) for driving at least one of the second pole piece 4 and the permanent magnet 5 to bring the second pole piece 4 and the permanent magnet 5 into contact with and away from each other in the axial direction of the rotating shaft 2. Specifically, a second driving member is disposed between the second pole piece 4 and the permanent magnet 5, and the second driving member drives the second pole piece 4 so that the second pole piece 4 can contact with and be away from the permanent magnet 5 in the axial direction of the rotating shaft 2.
In other embodiments, the second driving member drives the permanent magnet 5 such that the permanent magnet 5 can contact and move away from the second pole piece 4 in the axial direction of the rotating shaft 2.
In still other embodiments, the second driving member drives the second pole piece 4 and the permanent magnet 5 to enable the second pole piece 4 and the permanent magnet 5 to contact with and move away from each other in the axial direction of the rotating shaft 2.
In some embodiments, the magnetic liquid sealing device further includes a first bearing 7 and a second bearing 8, the first bearing 7 and the second bearing 8 are disposed in the chamber 101, the first bearing 7 and the second bearing 8 are respectively sleeved on the rotating shaft 2, an outer circumference of the first bearing 7 and an outer circumference of the second bearing 8 are respectively in contact with an inner circumferential surface of the housing 1, and the first pole piece 3, the permanent magnet 5 and the second pole piece 4 are located between the first bearing 7 and the second bearing 8.
As shown in fig. 1, the first bearing 7 is disposed on the left side of the first pole piece 3, the second bearing 8 is disposed on the right side of the second pole piece 4, and the first bearing 7, the first pole piece 3, the permanent magnet 5, the second bearing 8 and the second pole piece 4 are sequentially sleeved on the rotating shaft 2 in the left-right direction.
In some embodiments, the housing 1 includes a cylinder 102, a first end cap 103 and a second end cap 104, the chamber 101 is formed in the cylinder 102, the first end cap 103 is disposed at one end of the housing 1, the second end cap 104 is disposed at the other end of the housing 1, the rotation shaft 2 is disposed on the first end cap 103 and/or the second end cap 104, and the first bearing 7 and the second bearing 8 are disposed between the first end cap 103 and the second end cap 104.
As shown in fig. 1, a first end cap 103 is disposed at the left end of the housing 1, a second end cap 104 is disposed at the right end of the housing 1, a chamber 101 is disposed in the cylinder 102, the rotating shaft 2 is disposed through the first end cap 103, and the right end of the rotating shaft 2 abuts against the second end cap 104. The left end face of the first bearing 7 is in contact with the right side face of the first end cap 103, and the right end face of the second bearing 8 is in contact with the left end face of the second end cap 104.
In other embodiments, the rotating shaft 2 may be disposed through the second end cover 104, and the left end of the rotating shaft 2 abuts against the first end cover 103.
In still other embodiments, the shaft 2 may be disposed through the first end cap 103 and the second end cap 104.
In some embodiments, the magnetic liquid sealing device further includes a sealing member 9, the second end cover 104 includes a first end face and a second end face which are oppositely arranged in the axial direction of the rotating shaft 2, the first end face of the second end cover 104 is adjacent to the housing 1 compared with the second end face of the second end cover 104, the first end face of the second end cover 104 is provided with a sealing groove 10, and the sealing member 9 is disposed in the sealing groove 10 and is in contact with the housing 1.
As shown in fig. 1, a first end face and a second end face of the second end cover 104 are oppositely arranged, the first end face is disposed on the left side of the second end face, the first end face contacts with the housing 1, the second end face is located in the cavity 101 and contacts with the second bearing 8, a sealing groove 10 is disposed on the first end face, and a sealing member 9 is disposed in the sealing groove 10 and is used for sealing the inner cavity 101 of the housing 1.
In some embodiments, the magnetic fluid 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 both disposed in the cavity 101, the first magnetism isolating ring 11 and the second magnetism isolating ring 12 are respectively sleeved on the rotating shaft 2, an outer circumferential surface of the first magnetism isolating ring 11 and an outer circumferential surface of the second magnetism isolating ring 12 are respectively in contact with an inner circumferential surface of the housing 1, the first magnetism isolating ring 11 is disposed between the first bearing 7 and the first pole shoe 3, and the second magnetism isolating ring 12 is disposed between the second pole shoe 4 and the second bearing 8.
As shown in fig. 1, a left end surface of a first magnetism isolating ring 11 is in contact with a right end surface of a first bearing 7, a right end surface of the first magnetism isolating ring 11 is adjacent to a left end surface of a first pole shoe 3 and has a certain gap, a right end surface of a second magnetism isolating ring 12 is in contact with a left end surface of the first bearing 7, a left end surface of the second magnetism isolating ring 12 is in contact with a right end surface of a second pole shoe 4, outer circumferential surfaces of the first magnetism isolating ring 11 and the second magnetism isolating ring 12 are in contact with an inner circumferential surface of a housing 1, and the inner circumferential surfaces of the first magnetism isolating ring 11 and the second magnetism isolating ring 12 are spaced from an outer circumferential surface of a rotating shaft 2 in the vertical direction.
In some embodiments, the magnetic liquid sealing device further comprises a positioning ring 13, the positioning ring 13 is disposed on the rotating shaft 2, and the positioning ring 13 is disposed in the chamber 101 and located between the first magnetism isolating ring 11 and the first pole shoe 3. As shown in fig. 1, the left end surface of the positioning ring 13 is in contact with the right end surface of the first magnetism isolating ring 11, the right end surface of the positioning ring 13 is in contact with the left end surface of the first pole shoe 3, and the positioning ring 13 is used for fixing the first magnetism isolating ring 11 and limiting the moving range of the first pole shoe 3 under the action of the spring, so that the danger caused by overlarge spring force is avoided.
In some embodiments, grooves are provided on both the outer circumference of the first pole piece 3 and the outer circumference of the second pole piece 4. The magnetic liquid sealing device further comprises a first sealing ring 14 and a second sealing ring 15, the first sealing ring 14 is arranged in the groove of the first pole shoe 3, the second sealing ring 15 is arranged in the groove of the second pole shoe 4, and the outer peripheral surface of the first sealing ring 14 and the outer peripheral surface of the second sealing ring 15 are respectively in contact with the inner peripheral surface of the shell 1.
As shown in fig. 1, a groove is formed on the outer circumferential surface of the first pole piece 3, a groove is also formed on the outer circumferential surface of the second pole piece 4, a first sealing ring 14 is arranged in the groove of the first pole piece 3, a second sealing ring 15 is arranged in the groove of the second pole piece 4, and the first sealing ring 14 and the second sealing ring 15 are used for sealing a gap between the outer circumferential surface of the first pole piece 3 and the outer circumferential surface of the second pole piece 4 and the inner circumferential surface of the housing 1.
A magnetic liquid seal device according to some specific examples of the present invention is described below with reference to fig. 1 to 3.
The magnetic liquid sealing device comprises a shell 1, a rotating shaft 2, a first pole shoe 3, a second pole shoe 4, a permanent magnet 5, a first driving piece 6, a first bearing 7, a second bearing 8, a sealing piece 9, a first magnetism isolating ring 11, a second magnetism isolating ring 12, a positioning ring 13, a first sealing ring 14 and a second sealing ring 15.
As shown in fig. 1-3, a chamber 101 is provided in the housing 1, the housing 1 includes a cylinder 102, a first end cap 103 and a second end cap 104, the first end cap 103 is disposed on the left side of the cylinder 102, the second end cap 104 is disposed on the right side of the cylinder 102, the rotating shaft 2 is disposed through the first end cap 103, and the right end of the rotating shaft 2 abuts against the second end cap 104.
The first bearing 7, the first pole shoe 3, the permanent magnet 5, the second bearing 8 and the second pole shoe 4 are all arranged in the cavity 101 and sequentially sleeved on the rotating shaft 2 in the left-right direction, the first bearing 7 is arranged on the left side of the first pole shoe 3, the second bearing 8 is arranged on the right side of the second pole shoe 4, the left end face of the permanent magnet 5 is in contact with the right end face of the first pole shoe 3, and the right end face of the permanent magnet 5 is in contact with the left end face of the second pole shoe 4.
A first driving piece 6 is arranged between the first pole shoe 3 and the permanent magnet 5, the first driving piece 6 comprises a spring, a groove is formed in the right end face of the first pole shoe 3, a part of the spring is arranged in the groove, and the other part of the spring is in contact with the permanent magnet 5 and is used for driving the first pole shoe 3 and the permanent magnet 5 to move in the left-right direction.
The first magnetism isolating ring 11 is arranged between the first bearing 7 and the first pole shoe 3, the second magnetism isolating ring 12 is arranged between the second bearing 8 and the second pole shoe 4, the positioning ring 13 is arranged between the first magnetism isolating ring 11 and the first pole shoe 3, a groove is arranged on the outer peripheral surface of the first pole shoe 3, a first sealing ring 14 is arranged in the groove, the outer peripheral surface of the first sealing ring 14 is in contact with the inner peripheral surface of the shell 1, a groove is also arranged on the outer peripheral surface of the second pole shoe 4, a second sealing ring 15 is arranged in the groove, and the outer peripheral surface of the second sealing ring 15 is in contact with the inner peripheral surface of the shell 1.
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 on the shell in a penetrating mode, and at least part of the rotating shaft is located in the cavity;
a first pole piece and a second pole piece which 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 rotating shaft, the inner circumferential surface of the first pole shoe is provided with a plurality of first pole teeth, the inner peripheral surface of the first pole tooth and the outer peripheral surface of the rotating shaft are arranged at intervals in the radial direction of the rotating shaft to form a first seal gap, a plurality of the first pole teeth are arranged at intervals in the axial direction of the rotating shaft, the first sealing gap is adsorbed with magnetic liquid, the inner circumferential surface of the second pole shoe is provided with a plurality of second pole teeth, the inner circumferential surface of the second pole tooth and the outer circumferential surface of the rotating shaft are arranged at intervals in the radial direction of the rotating shaft to form a second sealing gap, the second pole teeth are arranged at intervals in the axial direction of the rotating shaft, and magnetic liquid is adsorbed in the second sealing gap;
the permanent magnet is wound on the rotating shaft and is positioned between the first pole shoe and the second pole shoe in the axial direction of the rotating shaft;
a first driving member for driving at least one of the first pole piece and the permanent magnet to bring the first pole piece and the permanent magnet into contact with and away from each other in an axial direction of the rotating shaft;
the first driving member includes an elastic member disposed between the first pole piece and the permanent magnet and having an elastic force urging the first pole piece and the permanent magnet away from each other, and in an operating state of the magnetic liquid sealing device, a pressure difference between both sides of the housing in a length direction thereof is adapted to overcome the elastic force of the elastic member to bring the first pole piece and the permanent magnet into contact with each other.
2. The magnetic fluid seal apparatus of claim 1, wherein said elastic member is a spring, a groove is formed on a side of said first pole piece adjacent to said permanent magnet, at least a portion of said spring is disposed in said groove, and one end of said spring is connected to said first pole piece and the other end of said spring is connected to said permanent magnet.
3. The magnetic liquid seal device according to claim 1 or 2, further comprising a second driving member for driving at least one of the second pole piece and the permanent magnet to bring the second pole piece and the permanent magnet into contact with and away from each other in an axial direction of the rotating shaft.
4. The magnetic fluid sealing device according to claim 1 or 2, further comprising a first bearing and a second bearing, wherein the first bearing and the second bearing are disposed in a chamber, the first bearing and the second bearing are respectively sleeved on the rotating shaft, an outer circumference of the first bearing and an outer circumference of the second bearing are respectively in contact with an inner circumferential surface of the housing, and the first pole piece, the permanent magnet and the second pole piece are disposed between the first bearing and the second bearing.
5. The magnetic fluid seal apparatus of claim 4, wherein the housing includes a cylinder, a first end cap and a second end cap, the chamber is formed in the cylinder, the first end cap is disposed at one end of the housing, the second end cap is disposed at the other end of the housing, the shaft is disposed through the first end cap and/or the second end cap, and the first bearing and the second bearing are disposed between the first end cap and the second end cap.
6. The magnetic liquid seal device according to claim 5, further comprising a seal member, wherein the second end cover includes a first end surface and a second end surface that are arranged opposite to each other in the axial direction of the rotating shaft, the first end surface of the second end cover is adjacent to the housing in comparison with the second end surface of the second end cover, the first end surface of the second end cover is provided with a seal groove, and the seal member is provided in the seal groove and is in contact with the housing.
7. The magnetic fluid sealing device of claim 5, 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 both disposed in the cavity, the first magnetism isolating ring and the second magnetism isolating ring are respectively sleeved on the rotating shaft, an outer circumferential surface of the first magnetism isolating ring and an outer circumferential surface of the second magnetism isolating ring are respectively in contact with an inner circumferential surface of the housing, the first magnetism isolating ring is disposed between the first bearing and the first pole shoe, and the second magnetism isolating ring is disposed between the second pole shoe and the second bearing.
8. The magnetic fluid seal apparatus of claim 7 further comprising a positioning ring disposed about said shaft, said positioning ring disposed within said chamber between said first magnetically isolating ring and said first pole piece.
9. The magnetic fluid sealing device according to claim 8, wherein grooves are formed on the outer circumferential surface of the first pole piece and the outer circumferential surface of the second pole piece, the magnetic fluid sealing device further comprises a first sealing ring and a second sealing ring, the first sealing ring is arranged in the groove of the first pole piece, the second sealing ring is arranged in the groove of the second pole piece, and the outer circumferential surfaces of the first sealing ring and the second sealing ring are respectively in contact with the inner circumferential surface of the housing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011339436.5A CN112431927B (en) | 2020-11-25 | 2020-11-25 | Magnetic liquid sealing device |
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| CN202011339436.5A CN112431927B (en) | 2020-11-25 | 2020-11-25 | Magnetic liquid sealing device |
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| CN112431927B true CN112431927B (en) | 2021-11-16 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963544B (en) * | 2021-03-17 | 2022-03-15 | 清华大学 | Magnetic liquid sealing device with porous medium material layer |
| CN112963547B (en) * | 2021-03-23 | 2022-06-03 | 清华大学 | Magnetic liquid heat insulation sealing device |
| CN113494608B (en) * | 2021-08-02 | 2022-07-22 | 北京交通大学 | Magnetic liquid sealing device capable of resisting axial and radial vibration |
| CN113839510B (en) * | 2021-09-26 | 2022-08-19 | 佛山德玛特智能装备科技有限公司 | Sealing structure and motor |
| CN114110170B (en) * | 2021-10-26 | 2022-09-20 | 清华大学 | Floating type magnetic liquid sealing device |
| CN115370751A (en) * | 2022-09-13 | 2022-11-22 | 北京交通大学 | Magnetic liquid sealing device resistant to axial and radial vibration |
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